U.S. patent application number 16/642882 was filed with the patent office on 2020-09-24 for electric oil pump.
This patent application is currently assigned to Hangzhou Sanhua Research Institute Co., Ltd.. The applicant listed for this patent is Hangzhou Sanhua Research Institute Co., Ltd.. Invention is credited to Jiangang Lu, Zhiwang Wu, Bingjiu Yin, Kai Zhang, Yubin Zhou.
Application Number | 20200300241 16/642882 |
Document ID | / |
Family ID | 1000004914310 |
Filed Date | 2020-09-24 |
View All Diagrams
United States Patent
Application |
20200300241 |
Kind Code |
A1 |
Lu; Jiangang ; et
al. |
September 24, 2020 |
ELECTRIC OIL PUMP
Abstract
An electric oil pump includes a pump housing, a first rotor
assembly, a pump shaft, a second rotor assembly, a stator assembly,
and a circuit board assembly. The pump housing includes at least a
first housing, a second housing, and a third housing. A first
cavity is formed between the first housing and the second housing.
A second cavity is formed between the second housing and the third
housing. The first rotor assembly is accommodated in the first
cavity. The second rotor assembly, the stator assembly, and the
circuit board assembly are accommodated in the second cavity. The
first cavity and the second cavity are isolated by an isolation
portion, such that working media provided therein do not
communicate with each other.
Inventors: |
Lu; Jiangang; (Hangzhou,
Zhejiang, CN) ; Wu; Zhiwang; (Hangzhou, Zhejiang,
CN) ; Yin; Bingjiu; (Hangzhou, Zhejiang, CN) ;
Zhang; Kai; (Hangzhou, Zhejiang, CN) ; Zhou;
Yubin; (Hangzhou, Zhejiang, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hangzhou Sanhua Research Institute Co., Ltd. |
Hangzhou, Zhejiang |
|
CN |
|
|
Assignee: |
Hangzhou Sanhua Research Institute
Co., Ltd.
Hangzhou, Zhejiang
CN
|
Family ID: |
1000004914310 |
Appl. No.: |
16/642882 |
Filed: |
June 11, 2018 |
PCT Filed: |
June 11, 2018 |
PCT NO: |
PCT/CN2018/090551 |
371 Date: |
February 27, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 2210/14 20130101;
F04C 2/10 20130101 |
International
Class: |
F04C 2/10 20060101
F04C002/10 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 31, 2017 |
CN |
201710769833.8 |
Claims
1. An electric oil pump, comprising: a pump housing, a first rotor
assembly, a pump shaft, a second rotor assembly, a stator assembly
and a circuit board assembly, wherein the pump housing at least
comprises a first housing, a second housing and a third housing,
the electric oil pump has a pump inner chamber, the pump inner
chamber comprises a first inner chamber and a second inner chamber,
a sidewall forming the first inner chamber comprises part of the
first housing and part of the second housing, a sidewall forming
the second inner chamber comprises part of the third housing, and
the third housing is configured to shield the circuit board
assembly; the first rotor assembly is accommodated in the first
inner chamber, and the second rotor assembly, the stator assembly
and the circuit board assembly are accommodated in the second inner
chamber; the electric oil pump comprises a partition portion, the
partition portion is arranged between the first housing and the
third housing, and the first inner chamber and the second inner
chamber are located on two sides of the partition portion; and the
first inner chamber is isolated from the second inner chamber by
the partition portion, or the electric oil pump further comprises a
sealing portion, and the first inner chamber is isolated from the
second inner chamber by the partition portion and the sealing
portion.
2. The electric oil pump according to claim 1, wherein the second
housing is detachably connected with the first housing, the second
housing is closer to the second rotor assembly than the first
housing, the second housing comprises the partition portion, and
the partition portion is configured to support the first rotor
assembly.
3. The electric oil pump according to claim 1, wherein the second
housing is detachably connected with the first housing, the second
housing is closer to the second rotor assembly than the first
housing, the partition portion is detachably connected with the
first housing and the second housing, the partition portion is
configured to support the first rotor assembly, and the partition
portion is closer to the second rotor assembly than the second
housing.
4. The electric oil pump according to claim 1, further comprising a
fourth housing, wherein the fourth housing is detachably connected
with the second housing, the fourth housing is detachably connected
with the third housing, the fourth housing comprises the partition
portion, and the partition portion is configured to support the
first rotor assembly.
5. The electric oil pump according to claim 1, wherein the
partition portion comprises a first support portion, the first
support portion is arranged protruding from a main body portion of
the partition portion toward the second inner chamber, and the pump
shaft is directly or indirectly supported on the first support
portion.
6. The electric oil pump according to claim 5, wherein the first
support portion comprises a first accommodating portion, the first
accommodating portion is formed with at least part of a first
accommodating cavity, the first accommodating cavity is surrounded
by at least part of an inner circumferential surface of the first
accommodating portion, and the pump shaft passes through the first
accommodating cavity, and at least part of an outer circumferential
surface of the pump shaft is in a clearance fit with the inner
circumferential surface of the first accommodating portion; or the
electric oil pump comprises a first bearing, the first bearing is
provided in the first accommodating cavity, the pump shaft passes
through the first bearing, and an outer circumferential surface of
the first bearing is in an interference fit with the inner
circumferential surface of the first accommodating portion.
7. The electric oil pump according to claim 6, wherein the first
support portion comprises a second accommodating portion, the
second accommodating portion is formed with at least part of a
second accommodating cavity, the second accommodating cavity is
surrounded by at least part of an inner circumferential surface of
the second accommodating portion, the sealing portion comprises an
oil seal, the oil seal is provided in the second accommodating
cavity, the pump shaft passes through the oil seal, and an outer
circumferential surface of the oil seal is sealingly fitted to the
second accommodating portion.
8. The electric oil pump according to claim 6, wherein the first
support portion comprises a second accommodating portion, at least
part of the pump shaft passes through the second accommodating
portion; and a clearance is formed between the inner
circumferential surface of the second accommodating portion and at
least part of the outer circumferential surface of the pump shaft,
the clearance is smaller than a penetration distance of a working
medium in the first inner chamber, and the clearance is configured
to prevent the working medium in the first inner chamber from
entering the second inner chamber through the clearance.
9. The electric oil pump according to claim 1, wherein the second
rotor assembly is arranged between the first rotor assembly and the
circuit board assembly; the first rotor assembly is arranged toward
to one end of the pump shaft, the second rotor assembly is arranged
close to another end of the pump shaft, the circuit board assembly
is close to one end of the pump shaft mounted with the second rotor
assembly; and one end of the pump shaft close to the first rotor
assembly extends into the first inner chamber, and another end of
the pump shaft close to the second rotor assembly extends into the
second inner chamber.
10. The electric oil pump according to claim 1, further comprising
a partition plate, wherein the partition plate is provided in the
second inner chamber, the electric oil pump further comprises a
second support portion, the second support portion is integrally
formed with the partition plate, the second support portion is
arranged protruding from the partition plate toward the second
inner chamber, the electric oil pump comprises a second bearing,
and the pump shaft is directly supported on the second support
portion, or the pump shaft is supported on the second support
portion through the second bearing.
11. The electric oil pump according to claim 10, wherein the
partition plate comprises a third accommodating portion, the third
accommodating portion is formed with at least part of a third
accommodating cavity, and the third accommodating cavity is
surrounded by at least part of an inner circumferential surface of
the third accommodating portion, and the pump shaft passes through
the third accommodating cavity, and at least part of the outer
circumferential surface of the pump shaft is in a clearance fit
with an inner circumferential surface of the third accommodating
portion; or the electric oil pump comprises a second bearing, the
second bearing is provided in the third accommodating cavity, the
pump shaft passes through the second bearing, and an outer
circumferential surface of the second bearing is in an interference
fit with the inner circumferential surface of the third
accommodating portion.
12. The electric oil pump according to claim 1, wherein the first
housing is detachably connected with the second housing through a
first connection portion, the second housing is detachably
connected with the third housing through a second connection
portion, and the first connection portion and the second connection
portion are not arranged in the first inner chamber or the second
inner chamber.
13. The electric oil pump according to claim 12, wherein the first
connection portion comprises first screws, the first housing
comprises a first flange portion, the first flange portion is
arranged protruding from the first housing, the first flange
portion is formed with first communication holes, the second
housing is formed with first threaded holes, the first threaded
holes are formed along a main body portion of the second housing,
the first screws pass through the first communication holes and are
mounted from a side close to the first housing, and the first
screws are screwed to the second housing.
14. The electric oil pump according to claim 1, wherein the
electric oil pump comprises an outer sealing portion, the outer
sealing portion comprises a first sealing ring and a second sealing
ring which are sleeved on an outer circumferential surface of the
second housing, the first sealing ring is arranged close to the
first housing, and the second sealing ring is arranged close to the
third housing.
15. The electric oil pump according to claim 14, wherein the first
rotor assembly comprises a first rotor and a second rotor, a
hydraulic chamber with a variable volume is formed between the
first rotor and the second rotor, the electric oil pump further
comprises a first flow port and a second flow port, the working
medium flows into the electric oil pump through the first flow
port, and the working medium flows out of the electric oil pump
through the second flow port; and the electric oil pump further
comprises a first communication cavity and a second communication
cavity, the first communication cavity is arranged between the
first flow port and the hydraulic chamber, the first communication
cavity is in communication with the first flow port, the second
communication cavity is arranged between the second flow port and
the hydraulic chamber, and the second communication cavity is in
communication with the second flow port.
16. The electric oil pump according to claim 2, wherein the
partition portion comprises a first support portion, the first
support portion is arranged protruding from a main body portion of
the partition portion toward the second inner chamber, and the pump
shaft is directly or indirectly supported on the first support
portion.
17. The electric oil pump according to claim 3, wherein the
partition portion comprises a first support portion, the first
support portion is arranged protruding from a main body portion of
the partition portion toward the second inner chamber, and the pump
shaft is directly or indirectly supported on the first support
portion.
18. The electric oil pump according to claim 4, wherein the
partition portion comprises a first support portion, the first
support portion is arranged protruding from a main body portion of
the partition portion toward the second inner chamber, and the pump
shaft is directly or indirectly supported on the first support
portion.
Description
[0001] The present application claims the priority to Chinese
Patent Application No. 201710769833.8, titled "ELECTRIC OIL PUMP",
filed with the National Intellectual Property Administration on
Aug. 31, 2017, which is incorporated herein by reference in its
entirety.
FIELD
[0002] The present application relates to the field of vehicles,
and in particular to components of a vehicle lubrication system
and/or a vehicle cooling system.
BACKGROUND
[0003] The automobile industry is developing rapidly. With the
automobile performance developing toward safer, more reliable, more
stable, fully automated, intelligent and environment-friendly and
energy saving, electric oil pumps are widely used in vehicle
thermal management systems, and can well meet the market
requirements.
[0004] The electric oil pump mainly provides power for the vehicle
lubrication system and/or the vehicle cooling system. How to design
the structure of the electric oil pump to improve the structure and
the performance of the electric oil pump is an urgent technical
problem to be solved.
SUMMARY
[0005] An object of the present application is to provide an
electric oil pump.
[0006] In order to achieve the above object, the following
technical solution is provided according to the present
application.
[0007] The electric oil pump includes a pump housing, a first rotor
assembly, a pump shaft, a second rotor assembly, a stator assembly
and a circuit board assembly. The pump housing at least includes a
first housing, a second housing and a third housing. The electric
oil pump has a pump inner chamber, the pump inner chamber includes
a first inner chamber and a second inner chamber, a sidewall
forming the first inner chamber includes part of the first housing
and part of the second housing, and a sidewall forming the second
inner chamber includes part of the second housing and part of the
third housing. The first rotor assembly is accommodated in the
first inner chamber. The second rotor assembly, the stator assembly
and the circuit board assembly are accommodated in the second inner
chamber. The electric oil pump includes a partition portion, the
partition portion is located between the first housing and the
third housing, and the first inner chamber and the second inner
chamber are located on two sides of the partition portion. The
first inner chamber and the second inner chamber are separated by
the partition portion; or the electric oil pump further includes a
sealing portion, and the first inner chamber and the second inner
chamber are separated by the partition portion and the sealing
portion. Since a working medium in the first inner chamber of the
electric oil pump is not in communication with a working medium in
the second inner chamber, the working medium in the first inner
chamber cannot enter the second inner chamber. Thus, the second
inner chamber does not need to be additionally provided with other
structures to prevent the components in the second inner chamber
from corrosion, and the electric oil pump has better sealing
performance and a simpler structure, which helps to reduce
costs.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a schematic perspective view of a first embodiment
of an electric oil pump according to the present application;
[0009] FIG. 2a is a schematic sectional view of the electric oil
pump shown in FIG. 1 taken along one direction;
[0010] FIG. 2b is a schematic sectional view of a second embodiment
of the electric oil pump according to the present application;
[0011] FIG. 2c is a schematic sectional view of a third embodiment
of the electric oil pump according to the present application;
[0012] FIG. 2d is a schematic sectional view of a fourth embodiment
of the electric oil pump according to the present application;
[0013] FIG. 3 is a schematic sectional view of the electric oil
pump shown in FIG. 1 taken along another direction;
[0014] FIG. 4 is a schematic front view of the electric oil pump
shown in FIG. 1;
[0015] FIG. 5 is a schematic front view of the electric oil pump
that is not assembled with the first housing shown in FIG. 1;
[0016] FIG. 6 is a schematic perspective view of a first embodiment
of the first housing shown in FIG. 1 viewed from one direction;
[0017] FIG. 7 is a schematic perspective view of the first
embodiment of the first housing shown in FIG. 1 viewed from another
direction;
[0018] FIG. 8 is a schematic front view of the first housing shown
in FIG. 6 viewed from one direction;
[0019] FIG. 9 is a schematic front view of the first housing shown
in FIG. 6 viewed from another direction;
[0020] FIG. 10 is a schematic sectional view of the first housing
shown in FIG. 6 taken along one direction;
[0021] FIG. 11 is a schematic sectional view of the first housing
shown in FIG. 6 taken along another direction;
[0022] FIG. 12 is a schematic sectional view of another embodiment
of the first housing shown in FIG. 1;
[0023] FIG. 13 is a schematic perspective view of a first
embodiment of the second housing shown in FIG. 1 or FIG. 2a viewed
from one direction;
[0024] FIG. 14 is a schematic perspective view of the first
embodiment of the second housing shown in FIG. 1 or FIG. 2a viewed
from another direction;
[0025] FIG. 15 is a schematic sectional view of the second housing
shown in FIG. 13;
[0026] FIG. 16 is a partially enlarged schematic view of portion B
of the second housing shown in FIG. 15;
[0027] FIG. 17 is a schematic sectional view of a fifth embodiment
of the electric oil pump according to the present application;
[0028] FIG. 18 is a schematic sectional view of the second housing
shown in FIG. 17;
[0029] FIG. 19 is a schematic sectional view of a sixth embodiment
of the electric oil pump according to the present application;
[0030] FIG. 20 is a schematic perspective view of the third housing
shown in FIG. 1 viewed from one direction;
[0031] FIG. 21 is a schematic front view of the third housing shown
in FIG. 19;
[0032] FIG. 22 is a schematic perspective view of the third housing
shown in FIG. 1 viewed from another direction;
[0033] FIG. 23 is another schematic front view of the third housing
shown in FIG. 19;
[0034] FIG. 24 is a schematic sectional view of the third housing
shown in FIG. 19;
[0035] FIG. 25 is a schematic perspective view of the partition
plate shown in FIG. 2a to FIG. 3 viewed from one direction;
[0036] FIG. 26 is a schematic perspective view of the partition
plate shown in FIG. 2a to FIG. 3 viewed from another direction;
[0037] FIG. 27 is a schematic front view of the partition plate
shown in FIG. 25 or FIG. 26;
[0038] FIG. 28 is a schematic sectional view of the partition plate
shown in FIG. 25 or FIG. 26;
[0039] FIG. 29 is a schematic perspective view of a combination of
a mounting bracket and a capacitor shown in FIG. 2a to FIG. 3;
[0040] FIG. 30 is a schematic front view of the combination of the
mounting bracket and the capacitor shown in FIG. 29;
[0041] FIG. 31 is a schematic perspective view of the mounting
bracket shown in FIG. 2a to FIG. 3;
[0042] FIG. 32 is a schematic front view of the mounting bracket
shown in FIG. 31; and
[0043] FIG. 33 is a partially enlarged schematic view of portion C
of the mounting bracket shown in FIG. 31.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0044] The present application is further illustrated hereinafter
in conjunction with drawings and specific embodiments.
[0045] An electric oil pump can be applied in a vehicle lubrication
system and/or a vehicle cooling system to provide circulating power
for the working medium in the vehicle lubrication system and/or the
vehicle cooling system, and the vehicle lubrication system and/or
the vehicle cooling system can provide lubricating oil and/or
cooling oil for a transmission system.
[0046] Referring to FIG. 1, FIG. 2a and FIG. 3, an electric oil
pump 100 includes a pump housing, a second rotor assembly 3, a
stator assembly 4, a pump shaft 5, a first rotor assembly 8 and a
circuit board assembly 6. The first rotor assembly 8, the second
rotor assembly 3 and the circuit board assembly 6 are arranged
along an axial direction of the electric oil pump 100, so that the
axial arrangement of the electric oil pump 100 can be more compact.
Specifically, the second rotor assembly 3 is arranged between the
first rotor assembly 8 and the circuit board assembly 6. The
electric oil pump has a pump inner chamber. The second rotor
assembly 3, the stator assembly 4, the pump shaft 5, the first
rotor assembly 8 and the circuit board assembly 6 are accommodated
in the pump inner chamber. When the electric oil pump 100 is in
operation, the circuit board assembly 6 controls the stator
assembly 4 to generate a varying excitation magnetic field by
controlling a current passing through the stator assembly 4 to
change according to a certain rule, the second rotor assembly 3
rotates under the action of the excitation magnetic field, and the
second rotor assembly 3 drives the first rotor assembly 8 to rotate
by the pump shaft 5. When the first rotor assembly 8 rotates, the
working medium is extruded out of a second flow port, thereby
generating the power for flowing.
[0047] The pump housing at least includes a first housing, a second
housing and a third housing. Specifically, referring to FIG. 2a, in
the present embodiment, the pump housing includes a first housing
1, a second housing 2 and a third housing 7. The electric oil pump
can form a pump inner chamber, and in the present embodiment, the
pump inner chamber includes a first inner chamber 80 and a second
inner chamber 90. The working medium can flow through the first
inner chamber 80, and the first rotor assembly 8 is arranged in the
first inner chamber 80. No working medium flows through the second
inner chamber 90. The stator assembly 4, the second rotor assembly
3 and the circuit board assembly 6 are arranged in the second inner
chamber 90. A sidewall forming the first inner chamber 80 includes
part of the first housing 1 and part of the second housing 20, and
a sidewall forming the second inner chamber 90 includes part of the
second housing 20 and part of the third housing 7. Referring to
FIG. 2a, the electric oil pump 100 includes a partition portion 22.
The first inner chamber 80 and the second inner chamber 90 are
located on two sides of the partition portion 22, respectively. The
electric oil pump 100 further includes a sealing portion 50. The
first inner chamber 80 is separated from the second inner chamber
90 by the partition portion 22 and the sealing portion 50, so that
the working medium in the first inner chamber 80 is not in
communication with the working medium in the second inner chamber
90 through the separation by the partition portion 22 and the
sealing portion 50. Such an arrangement completely separates the
stator assembly 4 and the circuit board assembly 6 from the working
medium, thereby ensuring that the performance of the stator
assembly and the circuit board assembly is not affected by the
working medium. Structures of the sealing portion 50 and the
partition portion 22 are described in detail hereinafter.
[0048] Referring to FIG. 1, FIG. 2a and FIG. 3, the first rotor
assembly 8 is close to one end of the pump shaft 5, the first rotor
assembly 8 is connected with part of the pump shaft 5, the second
rotor assembly 3 is close to the other end of the pump shaft 5, and
the second rotor assembly 3 is connected with part of the pump
shaft 5, so that the second rotor assembly 3 can drive the first
rotor assembly 8 to rotate by the pump shaft 5. The circuit board
assembly 6 is close to one end of the pump shaft 5 mounted with the
second rotor assembly 3. One end of the pump shaft 5 extends into
the first inner chamber 80, and the other end of the pump shaft 5
extends into the second inner chamber 90. Specifically, one end of
the pump shaft 5 close to the first rotor assembly 8 extends into
the first inner chamber 80, and the other end of the pump shaft 5
close to the second rotor assembly 3 extends into the second inner
chamber 90.
[0049] The electric oil pump includes the partition portion. The
first inner chamber and the second inner chamber are located on two
sides of the partition portion, respectively. The partition portion
is located between the first housing and the second housing. The
first rotor assembly and the second rotor assembly are arranged on
two sides of the partition portion, and the first inner chamber is
separated from the second inner chamber through the partition
portion. Four embodiments about the arrangement of the partition
portion are described below.
[0050] Referring to FIG. 1 and FIG. 2a, FIG. 1 and FIG. 2a are
schematic structural views of a first embodiment of the electric
oil pump. The structure of the first embodiment of the electric oil
pump is described below.
[0051] Referring to FIG. 1 and FIG. 2a, in the present embodiment,
the pump housing includes the first housing 1, the second housing 2
and the third housing 7. The second housing 2 is closer to the
second rotor assembly 3 than the first housing 1, the first housing
1 is detachably connected with the second housing 2, and the second
housing 2 is detachably connected with the third housing 7, which
facilitates the inspection and maintenance for the components
arranged in the chamber compared with non-detachable housing
connection. For example, if the connection between the first
housing 1 and the second housing 2 is opened, an operation status
of the first rotor assembly 8 can be inspected, and the first rotor
assembly 8 can be replaced as needed; and if the connection between
the second housing 2 and the third housing 7 is opened, an
operation status of the circuit board assembly 6 can be inspected,
and the circuit board assembly can be maintained and replaced as
needed, without destroying other components of the electric oil
pump, which helps to reduce costs and improve the maintenance
efficiency. Specifically, in the present embodiment, the first
housing 1 is detachably connected with the second housing 2 through
a first connection portion, and the second housing 2 is detachably
connected with the third housing 7 through a second connection
portion. The first connection portion and the second connection
portion are not arranged in the first inner chamber 80 or the
second inner chamber 90. The first connection portion and the
second connection portion are described in detail below.
[0052] Referring to FIG. 2a and FIG. 15, the second housing 2
includes the partition portion 22. The partition portion 22 can
support the first rotor assembly 8. The second housing 2 further
includes a main body portion 21, the main body portion 21 extends
along an axial direction of the second housing 2, the main body
portion 21 is cylindrical, and an inner wall of the main body
portion 21 can form at least part of the sidewall of the second
inner chamber 90 shown in FIG. 2a. The first housing 1 is
detachably connected with the main body portion 21, and the main
body portion 21 is detachably connected with the third housing 7 as
well. In the present embodiment, the sidewall forming the first
inner chamber 80 in FIG. 2a includes part of the first housing 1
and part of the second housing 2, and the sidewall forming the
second inner chamber 90 in FIG. 2a includes part of the second
housing 2 and part of the third housing 7. In the present
embodiment, the partition portion 22 is circumferentially arranged
along the inner wall of the main body portion 21, that is, the
partition portion 22 is fixed to the main body portion 21. In the
present embodiment, the partition portion 22 is integrally formed
with the main body portion 21, and the partition portion 22 is
arranged substantially perpendicular to the main body portion 21,
where the "substantially" refers to that the perpendicularity is
within a range of 1 mm. In the present embodiment, the partition
portion 22 is arranged at a middle-upper portion of the second
housing 2, the second inner chamber 90 is formed between the
partition portion 22 and the third housing 7, and the first inner
chamber 80 is formed between the first housing 1 and the partition
portion 22. Such a structure can ensure the sealing of the
connection between the partition portion 22 and the main body
portion 21, and can prevent the working medium in the first inner
chamber 80 in FIG. 2a from leaking through the connection between
the main body portion 21 and the partition portion 22, and the
structure is simple.
[0053] Referring to FIG. 2b, FIG. 2b is schematic structural view
of a second embodiment of the electric oil pump. The structure of
the second embodiment of the electric oil pump is described
below.
[0054] In the second embodiment of the electric oil pump, the
electric oil pump further includes a fourth housing, and the second
housing includes the partition portion. Specifically, referring to
FIG. 2b, an electric oil pump 100a includes a first housing 1a, a
second housing 2a, a third housing 7a and a fourth housing 40a. The
first housing 1a is detachably connected with the second housing 2a
and the fourth housing 40a. The third housing 7a is detachably
connected with the fourth housing 40a. Specifically, the second
housing 20a includes a main body portion 21a, the first housing 1a
is connected with the main body portion 21a of the second housing
2a through screws or bolts, and the main body portion 21a of the
second housing 2a is connected with the fourth housing 40a through
screws or bolts. An electric oil pump 100b includes a partition
portion 22a, and the partition portion 22a is integrally formed
with the second housing 2a. Specifically, the partition portion 22a
is integrally formed with the main body portion of the second
housing 20a. Compared with the first embodiment of the electric oil
pump, in the present embodiment, the electric oil pump further
includes the fourth housing 40a, and the structure of the second
housing 20a in the present embodiment is different from the
structure of the second housing in the first embodiment of the
electric oil pump. The structure of the second housing in the
present embodiment is equivalent to dividing the second housing in
the first embodiment of the electric oil pump into two components,
which is relatively advantageous for saving raw materials during
component processing and is further advantageous for reducing
material costs during processing.
[0055] Referring to FIG. 2c, FIG. 2c is schematic structural view
of a third embodiment of the electric oil pump. The structure of
the third embodiment of the electric oil pump is described
below.
[0056] In the third embodiment of the electric oil pump, the
partition portion is an individual component. Specifically,
referring to FIG. 2c, the electric oil pump 100b includes a first
housing 1b, a second housing 2b, a third housing 7b and a fourth
housing 40b, the first housing 1b is detachably connected with the
second housing 2b, and the third housing 7b is detachably connected
with the fourth housing 40b. In the present embodiment, the
electric oil pump 100b further includes a partition portion 22b,
and the partition portion 22b is arranged between the second
housing 2b and the fourth housing 40b. In the present embodiment,
the partition portion 22b is detachably connected with the first
housing 1b and the second housing 2b. The first housing 1b, the
second housing 2b, the partition portion 22b and the fourth housing
40b are detachably connected with each other through screws and
bolts. Apparently, in order to ensure the sealing of the
connections of the components, sealing rings can be provided at the
connections. Compared with the first embodiment of the electric oil
pump, in the present embodiment, the partition portion is an
individual component, which is advantageous for relatively reducing
the processing difficulty of the second housing and saving raw
materials during the component processing, and is further
advantageous for reducing the material costs during processing.
[0057] Referring to FIG. 2d, FIG. 2d is schematic structural view
of a fourth embodiment of the electric oil pump. The structure of
the fourth embodiment of the electric oil pump is described
below.
[0058] In the fourth embodiment of the electric oil pump, the
electric oil pump further includes a fourth housing, and the fourth
housing includes a partition portion. Specifically, referring to
FIG. 2d, an electric oil pump 100c includes a first housing 1c, a
second housing 20c, a third housing 7c and a fourth housing 40c.
The first housing 1c is detachably connected with the second
housing 2c and the fourth housing 40c, and the third housing 7c is
detachably connected with the fourth housing 40c. Specifically, the
first housing 1c is connected with the second housing 2c and the
fourth housing 40c through screws or bolts, and the fourth housing
40c is connected with the third housing 7c through screws or bolts.
The fourth housing 40c includes a partition portion 22c, and the
partition portion 22c can support the first rotor assembly.
Compared with the first embodiment of the electric oil pump, the
structure of the second housing in the present embodiment is
equivalent to dividing the second housing in the first embodiment
of the electric oil pump into two components, which is advantageous
for saving raw materials during the component processing, and is
further advantageous for reducing the material costs during
processing.
[0059] Referring to FIG. 2a to FIG. 5, in the present embodiment,
the electric oil pump 100 includes the first rotor assembly 8. The
first rotor assembly 8 includes a first rotor 81 and a second rotor
82, the first rotor 81 includes multiple external teeth, and the
second rotor 82 includes multiple internal teeth. Referring to FIG.
5, a hydraulic chamber 801 is formed between the internal teeth of
the second rotor 82 and the external teeth of the first rotor 81.
In the present embodiment, the second rotor 82 is sleeved on the
circumference of the first rotor 81, and part of the internal teeth
of the second rotor 82 engage with part of the external teeth of
the first rotor 81. Referring to FIG. 1 to FIG. 5, the electric oil
pump 100 includes a first flow port 11 and a second flow port 12,
the first flow port 11 is used for the inflow of the working
medium, and the second flow port 12 is used for the outflow of the
working medium. Specifically, the working medium can enter the
hydraulic chamber 801 through the first flow port 11, and can leave
the hydraulic chamber 801 through the second flow port 12. Since
there is a certain eccentric distance between the first rotor 81
and the second 82, when the first rotor 81 rotates, part of the
external teeth of the first rotor 81 engage with part of the
internal teeth of the second rotor 82, thereby driving the second
rotor 82 to rotate. Volume of the hydraulic chamber 801 changes
during one cycle of the rotation of the first rotor assembly 8.
Specifically, when the first rotor assembly 8 is rotated by a
certain angle from a starting point, the volume of the hydraulic
chamber 801 is gradually increased to form partial vacuum, and the
working medium is sucked from the first flow port 11 into the
hydraulic chamber 801. When the first rotor assembly 8 continues
rotating, the volume of the hydraulic chamber 801 filled with the
working medium is gradually decreased, and the working medium is
squeezed, so that the working medium entering the hydraulic chamber
801 is extruded out to the second flow port 12, thereby generating
the power for flowing. In the present embodiment, the first inner
chamber 80 is in communication with the first flow port 11 and the
second flow port 12, and the first inner chamber 80 is not in
communication with the second inner chamber 90. Since the first
inner chamber of the electric oil pump is not in communication with
the second inner chamber, the working medium cannot enter the
second inner chamber. Thus, the second inner chamber does not need
to be additionally provided with other structures to prevent the
components in the second inner chamber from corrosion, and the
electric oil pump has better sealing performance and a simpler
structure, which helps to reduce costs. In the present embodiment,
a first communication cavity is provided between the first flow
port 11 and the hydraulic chamber 801, and a second communication
cavity is arranged between the second flow port 12 and the
hydraulic chamber 801. Such a structure buffers the working medium
through the first communication cavity and the second communication
cavity, which is advantageous for damping vibration and noise. The
specific structure is described below.
[0060] Referring to FIG. 1 to FIG. 8, the first housing 1 is
detachably connected with the second housing 2 through a first
connection portion 123, and the second housing 2 is detachably
connected with the third housing 7 through a second connection
portion 232. The first connection portion 124 and the second
connection portion 234 are not arranged in the first inner chamber
80 or the second inner chamber 90. Specifically, in the present
embodiment, the first connection 124 includes first screws 1231 (as
shown in FIG. 2a). Referring to FIG. 6, in order to improve the
reliability of the connection, the first housing 1 includes a first
flange portion 15. The first flange portion 15 extends along a
radial direction of the electric oil pump, the first flange portion
15 is formed with first communication holes 13, and the first
communication holes 13 are close to an edge of the first flange
portion 15. The second housing 2 is formed with first threaded
holes 231, and the first threaded holes 231 are formed along the
main body portion 21 of the second housing 2. The first screws 1231
pass through the first communication holes 13 and are mounted from
a side close to the first housing 1, and are screwed to the second
housing 2. Such an arrangement allows at least part of the first
screws 1231 to be disassembled outside the housing, and makes the
disassembly of the electric oil pump more convenient, thereby
facilitating the maintenance of the first rotor assembly of the
electric oil pump. Apparently, the first housing 1 may be connected
with the second housing 2 in other ways, for example, some
detachable connection ways such as insertion and latching.
Referring to FIG. 11, in order to prevent the electric oil pump
from interfering with other components when the electric oil pump
is mounted on the transmission system, the first communication hole
13 includes a first counterbore 131 and a first through hole 132. A
diameter of the first counterbore 131 is greater than a diameter of
the first through hole 132, and a depth of the first counterbore
131 is slightly greater than a height of a nut of the first screw
1231, such that a top surface of the first screw 1231 is lower than
an upper surface of the first flange portion 15 after the first
screw 1231 is mounted, thereby preventing the first screw 1231 from
interfering with other components. Apparently, in a case that a
first screw avoidance portion is provide in a portion of the
transmission system corresponding to the electric oil pump, it is
not necessary to provide the first counterbore 131 for the first
communication hole 13, and only the first through hole 132 is
needed, such that the first communication hole 13 can be allowed to
be closer to the radial edge of the first flange portion 15 or a
distance between the first communication hole 13 and the edge of
the first flange portion 15 can be larger, which facilitates the
layout of the first communication hole.
[0061] Referring to FIG. 2a, the second housing 2a is detachably
connected with the third housing 7 through the second connection
portion 232. Specifically, in the present embodiment, the second
connection portion 232 includes second screws 2321. Referring to
FIG. 14 and FIG. 19, the third housing 7 is formed with second
communication holes 73, the second housing 2 is formed with second
threaded holes 241, the second threaded holes 241 are formed along
the main body portion 21 of the second housing 2, and the second
screws 2321 are mounted from a side close to the third housing 7
and is screwed to the second housing 2. Apparently, the third
housing 7 may be formed with the second threaded hole, the second
housing 2 may be formed with the second communication hole, and the
second screws 2321 may be mounted from a side close to the second
housing 2 and may be screwed to the third housing 7. The specific
structure can be designed according to requirements of the electric
oil pump. Such an arrangement makes the disassembly of the electric
oil pump more convenient, thereby facilitating the inspection and
maintenance of the components in the electric oil pump such as the
circuit board assembly. Apparently, the second housing 2 may be
connected with the third housing 7 in other detachable connection
ways such as insertion and latching. In order to improve the
reliability of the connection between the second housing 2 and the
third housing 7 and to simplify the structure, a wall thickness of
the third housing 7 at the second communication holes 73 is greater
than a wall thickness of the third housing 7 at other portions.
Referring to FIG. 13 and FIG. 14, the main body portion 21 of the
second housing 2 includes a cylindrical portion 201 and a second
flange portion 24. The cylindrical portion 201 forms at least part
of the second inner chamber. The second flange portion 24 is formed
by the cylindrical portion 201 protruding toward the circumference
of the cylindrical portion 201. The second flange portion 24 is
formed with the second threaded holes 241, and the wall thickness
of the second flange portion 24 at the second threaded holes 241 is
greater than the wall thickness of the second flange portion 24 at
other portions. Apparently, in order to simplify the structure and
reduce the profile dimensions of the electric oil pump, the second
housing 2 may not include the second flange portion, and the
cylindrical portion 201 may be formed with the second threaded
holes 241. To ensure the connection strength, the wall thickness of
the cylindrical portion 201 at the second threaded holes is greater
than or equal to the wall thickness of the cylindrical portion at
other portions.
[0062] Referring to FIG. 6 to FIG. 11, FIG. 6 to FIG. 11 are
schematic structural views of a first embodiment of the first
housing shown in FIG. 2a. In the present embodiment, the first
housing 1 includes a first main body portion 14 and the first
flange portion 15, and a diameter of the first main body portion 14
is smaller than a diameter of the first flange portion 15. The
first housing 1 at least includes two first communication holes 13,
and the first communication holes 13 are distributed in an array
along a circumference of the first housing 1. In the present
embodiment, the first communication holes 13 are formed on the
first flange portion 15, and the first communication hole 13 is a
counterbore. Specifically, the first communication hole 13 is a
cylindrical counterbore. The first communication hole 13 includes
the first counterbore 131 and the first through hole 132, where the
diameter of the first counterbore 131 is greater than the diameter
of the first through hole 132, and the depth of the first
counterbore 131 is slightly greater than the height of a nut of the
first screw 1231, such that the top surface of the first screw 1231
is lower than the upper surface of the first flange portion 15
after the first screw 1231 is mounted, thereby preventing the first
screw 1231 from interfering with other components. Apparently, the
first communication hole 13 may be a tapered counterbore or an end
face counterbore. Such an arrangement can, on the one hand, ensure
that the electric oil pump does not interfere with a mounting
portion of a gearbox after the first screw 1231 is mounted, and on
the other hand, makes the overall structure of the electric oil
pump elegant. A minimum distance between the edge of the first
communication hole 13 and an outer circumferential surface of the
first flange portion 15 of the first housing 1 is greater than or
equal to 1 mm, such that it can be ensured that no gap is formed at
the edge while processing the first communication hole 13 and no
damage is done to the outer circumferential surface of the first
flange portion 15 of the first housing 1. A minimum distance
between the edge of the first communication hole 13 and an outer
circumferential surface of the first main body portion 14 is
greater than or equal to 1 mm, such that no damage is done to the
outer circumferential surface of the first main body portion 14 of
the first housing 1 while processing the first communication hole
13.
[0063] Referring to FIG. 6 to FIG. 11, the first housing 1 is
further formed with the first flow port 11, the second flow port
12, the first communication cavity 112 and the second communication
cavity 121. Referring to FIG. 2a and FIG. 5, the first
communication cavity 112 is arranged between the first flow port 11
and the hydraulic chamber 801, the first communication cavity 112
is in communication with the first flow port 11, the second
communication cavity 121 is arranged between the second flow port
12 and the hydraulic chamber 801, and the second communication
cavity 121 is in communication with the second flow port 12. The
first communication cavity 112 and the second communication cavity
121 are configured to buffer the working medium, which is
advantageous for damping vibration and noise. In the present
embodiment, the first flow port 11 is formed at the first main body
portion 14 of the first housing 1, the first communication cavity
112 is arranged at the first flange portion 15 of the first housing
1, and the first flow port 11 is substantially circular. The
"substantially circular" refers to that the roundness is within a
range of 1 mm. Apparently, the first flow port 11 may also in other
shapes such as an ellipse. Referring to FIG. 9, the first
communication cavity 112 is substantially arc-shaped, the first
communication cavity 112 includes a head portion 1121 and a tail
portion 1122, and a flow sectional area of the first communication
cavity 112 gradually increases from the head portion 1121 to the
tail portion 1122. In the present embodiment, an inner
circumferential surface of the first communication cavity 112 is
arc-shaped, and other features such as recess portions or
protruding portions may be provided on the inner circumferential
surface of the first communication cavity. The first flow port 11
is arranged corresponding to the tail portion 1122, which
cooperates with the hydraulic chamber 801 in FIG. 5 to form a
certain degree of vacuum at the tail portion 1122, and is
advantageous for the suction of the working medium.
[0064] The second communication cavity 121 and the first
communication cavity 112 are substantially circumferentially
distributed in the first housing 1, and a line connecting a center
of the first flow port 11 and a center of the second flow port 12
substantially passes through a center of the first housing 1, which
is advantageous for taking advantage of the entire circumference of
the entire electric oil pump and improving the working pressure of
the working medium passing through the electric oil pump.
[0065] A flow sectional area at the connection between the second
flow port 12 and the second communication cavity 121 is greater
than the flow sectional area at other portions of the second
communication cavity 121, which allows the working medium entering
the second communication cavity 112 from the hydraulic chamber 801
in FIG. 5 to be discharged as soon as possible.
[0066] In the present embodiment, a fluid flow direction at the
second flow port 12 and a fluid flow direction at the first flow
port 11 are both arranged along the axial direction of the electric
oil pump, that is, the fluid flow direction at the second flow port
12 and the fluid flow direction at the first flow port 11 are
arranged in a same direction of the electric oil pump, and an
inflow direction of the working medium is substantially parallel to
an outflow direction thereof, such that only one sealing portion is
required to be arranged between the electric oil pump and the
transmission system and the structure is simple. Apparently, the
fluid flow direction at the first flow port may be arranged
perpendicular to the fluid flow direction at the second flow port,
the second flow port may not be arranged in the first housing 1,
but be arranged in the second housing 2, for example, such that the
inflow direction of the working medium is arranged perpendicular to
or at an angle to the outflow direction thereof, to facilitate the
assembly of the electric oil pump and the transmission system or to
hang the electric oil pump outside the transmission system.
[0067] Referring to FIG. 12, FIG. 12 is a schematic structural view
of a second embodiment of the first housing shown in FIG. 2a.
Compared with the first embodiment of the first housing, in the
present embodiment, a connection hole 13' of a first housing 1' is
a through hole, which is advantageous for improving the connection
strength between the first housing and the second housing.
[0068] Referring to FIG. 2a, the electric oil pump 100 includes an
outer sealing portion, the outer sealing portion includes a first
sealing ring 30 and a second sealing ring 32 sleeved on the outer
circumferential surface of the second housing 2, the first sealing
ring 30 is close to the first housing 1, and the second sealing
ring 32 is close to the third housing 7. Referring to FIG. 15, the
first sealing ring 30 is sleeved on a second groove 271 of the
second housing 2, and the second sealing ring 32 is sleeved on a
third groove 281 of the second housing 2. Referring to FIG. 2, such
an arrangement can separate the working medium at the inlet and
outlet from a space between the first sealing ring 30 and the
second sealing ring 32, such that the two do not affect with each
other. Referring to FIG. 2a, in the present embodiment, the
electric oil pump further includes a third sealing ring 31.
Referring to FIG. 10, the first main body portion 14 is provided
with a first groove 141, the third sealing ring 31 is arranged in
the first groove 141 of the first housing 1. In a case that the
electric oil pump 100 is mounted in a gearbox of a vehicle or in an
electric drive unit of a vehicle, such an arrangement is
advantageous for isolating the low-pressure working medium on the
inlet side from the high-pressure working medium on the outlet
side.
[0069] Referring to FIG. 13 and FIG. 14, the main body portion 21
includes the cylindrical portion 201 and the second flange portion
24, the cylindrical portion 201 includes a first end portion 23 and
a second end portion 27, the second flange portion 24 is integrally
formed with the second end portion 27, and the first end portion 23
is arranged away from the second flange portion 24. Specifically,
in the present embodiment, the first end portion 23 is formed with
the first threaded holes 231, the first threaded holes 231 are
distributed in a circumferential array or uniformly distributed,
the first communication holes 13 of the first housing 1 are
arranged corresponding to the first threaded holes 231 of the
second housing 2, and the first housing 1 is connected with the
second housing 2 through the first connection portion 123. The
second flange portion 24 is formed with the second threaded holes
241, and the second threaded holes 241 are arranged corresponding
to the second communication holes 73 of the third housing 7.
Referring to FIG. 2a, the second housing 2 is connected with the
third housing 7 through the second connection portion 232, wherein
the first threaded holes 231 and the second threaded holes 241 are
both blind holes. Specifically, the first housing 1 is connected
with the second housing 2 through the first screws 1231, the second
housing 2 is connected with the third housing 7 through the second
screws 2321. In the present embodiment, the second flange portion
24 further includes a first protrusion 242, and the second threaded
holes 241 are formed on the first protrusion 242. A thickness of
the second flange portion 24 at the first protrusion 242 is greater
than the thickness of the second flange portion 24 at other
portions, which is advantageous for improving the connection
strength without increasing the overall thickness and weight of the
second housing 2, and is beneficial to reduce costs. Apparently, in
a case that the thickness of the second flange portion 24 of the
second housing 2 is thick enough, the second flange portion 24 may
not be provided with the first protrusion 242, where the "thick
enough" refers to that the thickness of the second flange portion
is greater than or equal to 3 mm.
[0070] Referring to FIG. 2a and FIG. 15, the partition portion 22
further includes a first support portion 29 and a main body portion
221 of the partition portion, the main body portion 221 of the
partition portion can support the first rotor assembly 8, and the
first support portion 29 protrudes from the main body portion 221
of the partition portion toward the second inner chamber 90. The
first support portion 29 can directly or indirectly support the
pump shaft 5. Referring to FIG. 2b to FIG. 2d, according to the
arrangement of the partition portion, the first support portion 29
changes correspondingly with the position of the partition portion
22, which will not be further described herein.
[0071] Referring to FIG. 15, the second housing 2 is formed with an
upper chamber 291 and a lower chamber 292, the upper chamber 291 is
separated from the lower chamber 292 through the partition portion
22, and the partition portion 22 is integrally formed with the
first support portion 29.
[0072] FIG. 15 is a first embodiment of the second housing shown in
FIG. 2a. Referring to FIG. 2, the electric oil pump 100 includes a
first bearing 60, the pump shaft 5 is supported on the first
support portion 29 by the first bearing 60, an inner
circumferential surface of the first bearing 60 is in contact with
an outer circumferential surface of the pump shaft 5, and an outer
circumferential surface of the first bearing 60 is in contact with
an inner circumferential surface of the first support portion 29.
Specifically, referring to FIG. 15, the first support portion 29
includes a first accommodating portion 290, the first accommodating
portion 290 is formed with at least part of a first accommodating
cavity, and at least part of an inner circumferential surface of
the first accommodating portion 290 surrounds the first
accommodating cavity. Referring to FIG. 2a or FIG. 3, the pump
shaft 5 passes through the first accommodating cavity, and at least
part of the outer circumferential surface of the pump shaft 5 is in
a clearance fit with the inner circumferential surface of the first
accommodating portion 290; or the first bearing 60 is provided in
the first accommodating cavity, referring to FIG. 2a or FIG. 3, the
pump shaft 5 passes through the first bearing 60, and the outer
circumferential surface of the first bearing 60 is in an
interference fit with the inner circumferential surface of the
first accommodating portion 290. Specifically, in the present
embodiment, the electric oil pump is provided with the first
bearing 60, the first bearing 60 is arranged in the first
accommodating cavity, and the pump shaft 5 passes through the first
bearing 60, such that the first support portion 29 indirectly
supports the pump shaft through the first bearing 60.
[0073] Referring to FIG. 17, FIG. 17 is a schematic structural view
of a fifth embodiment of the electric oil pump. FIG. 18 is the
second embodiment of the second housing shown in FIG. 17. Referring
to FIG. 17 and FIG. 18, in the present embodiment, the pump shaft 5
is directly supported on a first support portion 29'. Specifically,
the first support portion 29' includes a first accommodating
portion 290', and the first accommodating portion 290' can form at
least part of the first accommodating cavity. In the present
embodiment, the first accommodating cavity is in communication with
part of the first inner chamber 80, the pump shaft 5 passes through
the first accommodating cavity, and at least part of the outer
circumferential surface of the pump shaft 5 is in a clearance fit
with the inner circumferential surface of the first accommodating
portion 290'. The inner circumferential surface of the first
support portion 29' is provided with a lubrication groove 298,
which is helpful to lubricate the pump shaft and thereby
facilitates the rotation of the pump shaft. Compared with the first
embodiment of the electric oil pump, in the present embodiment, the
first support portion 29 can directly support the pump shaft by the
tolerance fit between the first accommodating portion 290' and the
pump shaft 5 without additionally providing the first bearing,
thereby making the structure of the electric oil pump more
compact.
[0074] Referring to FIG. 15, the partition portion 22 is provided
with a communication hole 2933, and the communication hole 2933
communicates the upper chamber 291 with the lower chamber 292.
Referring to FIG. 2a, the pump shaft 5 extends into the upper
chamber 291 through the communication hole 2933.
[0075] The first inner chamber 80 is isolated from the second inner
chamber 90. There are two embodiments about the isolation
arrangement herein. In the first embodiment, referring to FIG. 2a,
the electric oil pump 100 includes the sealing portion, at least
part of the sealing portion is supported by the first support
portion 29, the working medium in the first inner chamber 80 is not
in communication with the working medium in the second inner
chamber 90 due to the sealing portion 50 and the partition portion
22. Specifically, referring to FIG. 15, the first support portion
29 includes a second accommodating portion 296, the second
accommodating portion 296 is formed with at least part of a second
accommodating cavity, and at least part of the inner
circumferential surface of the second accommodating portion 296
surrounds the second accommodating cavity. Referring to FIG. 2a,
the sealing portion 50 includes an oil seal, and the oil seal is
provided in the second accommodating cavity. The pump shaft 5 shown
in FIG. 2 passes through the oil seal, and the inner
circumferential surface of the oil seal is in contact with at least
part of the outer circumferential surface of the pump shaft 5. The
outer circumferential surface of the oil seal 50 is sealingly
fitted to the inner circumferential surface of the second
accommodating portion 296, which can prevent the working medium in
the first inner chamber from flowing into the second inner chamber
and can thereby avoid damage to the circuit board assembly in the
second inner chamber.
[0076] In the second embodiment, referring to FIG. 19, FIG. 19 is a
schematic structural view of a sixth embodiment of the electric oil
pump. Referring to FIG. 15, the pump shaft 5 passes through the
second accommodating portion 296 in FIG. 15. A clearance is formed
between the inner circumferential surface of the second
accommodating portion 296 and at least part of the outer
circumferential surface of the pump shaft 5, and the clearance is
small enough that the working medium in the first inner chamber 80
cannot flow through. The clearance can prevent the working medium
in the first inner chamber 80 in FIG. 2 from entering the second
inner chamber 90 in FIG. 2a through the clearance. The specific
size of the clearance is determined by parameters such as the
roughness of the outer circumferential surface of the pump shaft 5,
the roughness of the inner circumferential surface of the second
accommodating portion and the viscosity of the oil. In the second
embodiment, the working medium in the first inner chamber is not in
communication with the working medium in the second inner chamber
by the arrangement of the clearance.
[0077] Referring to FIG. 2a, the electric oil pump 100 further
includes a second support portion 91. The pump shaft 5 can be
directly or indirectly supported on the second support portion 91.
The first support portion 29 and the second support portion 91 are
coaxially arranged, which is advantageous for improving the
stability of supporting the pump shaft 5.
[0078] Referring to FIG. 2a, the electric oil pump 100 further
includes a partition plate 9. The partition plate 9 is arranged in
the second inner chamber 90, the second support portion 91 is
integrally formed with the partition plate 9, and the second
support portion 91 is arranged protruding from the partition plate
9 toward the second inner chamber 90. The structure of the second
support portion 91 is described in detail below.
[0079] The second support portion 91 can directly or indirectly
provide support for the pump shaft 5. Referring to FIG. 25 to FIG.
28, the partition plate 9 includes a third accommodating portion
911, the third accommodating portion 911 is formed with at least
part of a third accommodating cavity, and at least part of an inner
circumferential surface of the third accommodating portion 911
surrounds the third accommodating cavity. There are two
embodiments. In the first embodiment, referring to FIG. 2a, the
electric oil pump includes a second bearing 70, the second bearing
70 is provided in the third accommodating cavity, and the pump
shaft 5 in FIG. 2a passes through the second bearing 70.
Specifically, the inner circumferential surface of the second
bearing 70 is in contact with at least part of the outer
circumferential surface of the pump shaft 5, and an outer
circumferential surface of the second bearing 70 is in an
interference fit with the inner circumferential surface of the
third accommodating portion 911, such that the first support
portion 29 indirectly provides support for the pump shaft through
the second bearing 70. In the second embodiment, the pump shaft 5
in FIG. 2a passes through the third accommodating cavity, and at
least part of the outer circumferential surface of the pump shaft 5
in FIG. 2a is in a clearance fit with the inner circumferential
surface of the third accommodating portion 911, such that the
second support portion 91 can directly provide support for the pump
shaft by the tolerance fit between the third accommodating portion
911 and the pump shaft 5 in FIG. 2a without additionally providing
the second bearing, thereby making the structure of the electric
oil pump more compact. Referring to FIG. 2a, the first bearing 60
and the second bearing 70 can be rolling bearings or sliding
bearings. For medium and low speeds, the electric oil pump with the
sliding bearing can meet the requirements of wear and rotation
accuracy while reducing the cost. For high-speed electronic oil
pumps, wear, rotation accuracy and bearing capacity are key factors
in bearing selection. In such cases, rolling bearings will be
preferred.
[0080] Referring to FIG. 25 to FIG. 28, the partition plate 9
includes the second support portion 91, a first bottom portion 92,
a first annular protrusion 94 and reinforcing ribs 93. The
reinforcing ribs 93 are distributed in the circumferential array or
uniformly distributed. Specifically, the reinforcing ribs 93
connect the second support portion 91 with the first bottom portion
92. Such an arrangement can ensure the mechanical strength of the
second support portion 91, such that the second support portion 91
is less likely to be deformed. In the present embodiment, the
reinforcing rib 91 has a substantially triangular shape.
Apparently, the reinforcing rib may also have other shapes such as
rectangular or trapezoidal. Compared with the second support
portion 91, the first annular protrusion 94 is arranged closer to
the outer edge of the partition plate 9. A diameter of an outer
wall of the first annular protrusion 94 is greater than that of the
second support portion 91. Referring to FIG. 2a or FIG. 3, in the
present embodiment, the partition plate 9 is fixedly connected with
the second housing 2. Specifically, referring to FIG. 33 and FIG.
15, the first annular protrusion 94 is in an interference fit with
the inner circumferential surface of the cylindrical portion of the
second housing 2. Apparently, the partition plate 9 may be
connected with the second housing 2 by screws or bolts or by
riveting. An outer circumferential surface of the first bottom
portion 92 of the partition plate 9 is in an interference fit with
the second housing 2. Referring to FIG. 26 to FIG. 28, the
partition plate 9 further includes at least two third annular
protrusions 95, and the third annular protrusions 95 axially extend
in a direction away from the second support portion 91.
Specifically, in the present embodiment, the partition plate 9
includes three third annular protrusions 95, and the third annular
protrusions 95 are substantially distributed in the circumferential
array or uniformly distributed. A threaded hole 951 is arranged at
a center of each third annular protrusion 95, which facilitates the
fixation and installation of the subsequent components such as a
mounting bracket 10 in FIG. 2a.
[0081] Referring to FIG. 15 and FIG. 16, the second housing 2
further includes a first stepped portion 294. The first stepped
portion 294 includes a first position-limiting surface 2941 and a
second position-limiting surface 2942. The first stepped portion
294 is arranged in the lower chamber 292 of the second housing 2,
and the first stepped portion 294 can serve as a position-limit for
the stator assembly 4 in FIG. 2a in the axial direction of the
electric oil pump. Referring to FIG. 15 and FIG. 16, the second
housing 2 further includes a second stepped portion 295. The second
stepped portion 295 includes a third position-limiting surface 2951
and a fourth position-limiting surface 2952, and the second stepped
portion 295 is closer to the second flange portion 24 of the second
housing 2 than the first stepped portion 294. The stator assembly 4
in FIG. 2a is in an interference fit with the second housing 2.
Specifically, an outer wall of the stator assembly 4 is in an
interference fit with at least part of the second position-limiting
surface 2942 of the first stepped portion 294 of the second housing
2. The first position-limiting surface 2941 of the first stepped
portion 294 abuts against the stator assembly 4, thereby realizing
the position-limiting of the stator assembly 4 in FIG. 1 by the
first stepped portion 294 in the axial direction of the electric
oil pump and facilitating the position-limiting of the stator
assembly.
[0082] Referring to FIG. 20 to FIG. 24, the third housing 7
includes a main body 71 and a connection portion 72. Taking the
main body 71 as a reference surface, the connection portion 72 is
located below the main body 71. The third housing 7 is formed with
the second communication holes 73, the second communication holes
73 are arranged corresponding to the second threaded holes 241 of
the second housing 2 in FIG. 14. In the present embodiment, the
second housing 2 is connected with the third housing 7 through the
second screws 2321 in FIG. 2a. Apparently, the two may also be
connected with each other by other connection ways such as
insertion, latching or welding. Referring to FIG. 24, the
connection portion 72 includes a position-limiting portion 76, and
a height H2 of the position-limiting portion 76 is substantially
equal to a height H1 of a position-limiting portion 243 of the
second housing 2 in FIG. 15 where the "substantially equal" refers
to that an absolute value of the height difference is within 0.3
mm. Such an arrangement can ensure that contact faces of the third
housing 7 and the second housing 2 are as close as possible, and
the third housing 7 does not incline during the assembly process,
thereby avoiding affecting the insertion between the socket and the
connector. The third housing 7 is further formed with mounting
holes 77, and the mounting holes 77 are configured to connect with
the gearbox or the drive unit. Two mounting holes 77 are provided
in the present embodiment.
[0083] Referring to FIG. 20 to FIG. 24, the third housing 7 is
further formed with protruding ribs 74, the protruding ribs 74 are
integrally formed with the third housing 7, and the protruding ribs
74 protrude toward a direction away from the second housing 2. In
the present embodiment, the protruding ribs 74 are arranged on the
third housing 7 as much as possible to increase a heat dissipation
area, which facilitates the heat dissipation of the circuit board.
In the present embodiment, the shape of a transverse section of the
protruding rib 74 is rectangular. Apparently, the transverse
section may also be in other shapes such as trapezoid, triangle,
and arc-shaped.
[0084] Referring to FIG. 2a and FIG. 29 to FIG. 33, the circuit
board assembly 6 includes a circuit board 61, electronic components
and the mounting bracket 10. The mounting bracket 10 is arranged
between the circuit board 61 and the partition plate 9. The
mounting bracket 10 is fixedly connected with the partition plate
9. Specifically, the mounting bracket 10 is connected with the
partition plate 9 by screws and bolts. Apparently, the mounting
bracket 10 may also be connected with the partition plate 9 by
other connection ways such as riveting. The mounting bracket 10 is
electrically connected with the circuit board 61, and the mounting
bracket 10 can support large-volume electronic components.
Referring to FIG. 29 to FIG. 33, the mounting bracket 10 includes
an accommodating portion 102. The accommodating portion 102 is
integrally formed with the mounting bracket 10 by injection
molding. The accommodating portion 102 includes a bottom supporting
portion 1021 and a side portion 1022, the bottom supporting portion
1021 and the side portion 1022 form the accommodating cavity. In
the present embodiment, the accommodating cavity is provided with a
large-volume electronic component, and the large-volume electronic
component is a capacitor 101. In the present embodiment, the bottom
supporting portion 1021 is substantially arc-shaped, the bottom
supporting portion 1021 is in contact with part of an outer
circumferential surface of the capacitor 101, and the bottom
supporting portion 1021 and the side portion 1022 are provided to
facilitate circumferential positioning of the capacitor 101,
thereby ensuring that the capacitor 101 do not move
circumferentially. The mounting bracket 10 further includes as
least two latching portions 103. In the present embodiment, the
mounting bracket includes two latching portions 103, and the two
latching portions 103 are arranged two sides of the capacitor 101.
The latching portion 103 includes a first surface 1031. During the
process of mounting the capacitor 101 into the accommodating
portion 102, the capacitor 101 come into contact with the first
surface 1031 of the latching portion 103 first, and at this time,
the first inclined surface 1031 is tangent to the outer
circumferential surface of the capacitor 101. When the capacitor
101 is further mounted into the accommodating portion 102, there
will be a component force acting on the first surface 1031, so that
the latching portion 103 is opened outward. When the part of the
outer circumferential surface of the capacitor 101 is in contact
with the bottom supporting portion 1021, no acting force is
generated between the part of the outer circumferential surface of
the capacitor 101 and the first surface of the latching portion
103, and at this time, the latching portion 103 which was
originally in the open state is restored to its initial position.
On the one hand, such an arrangement can ensure that the large
capacitor does not move in a vertical direction, and on the other
hand, it will make the disassembly and assembly of the large
capacitor simpler, thereby improving the disassembly and assembly
efficiency of the large capacitor. The mounting bracket 10 further
includes at least two through holes 104, and the through holes 104
are substantially distributed in the circumferential array or
uniformly distributed. In the present embodiment, the number of the
through holes 104 is substantially equal to the number of the
threaded holes 951 of the third annular protrusions 95 of the
partition plate 9. Specifically, the mounting bracket 10 includes
three through holes 104, and the number of the through holes 104 is
equal to the number of the threaded holes 951 of the third annular
protrusions 95 of the partition plate 9.
[0085] It should be understood that the above embodiments are only
intended to illustrate the present application and not to limit the
technical solutions described in the present application. Although
the present specification has been described in detail with
reference to the embodiments described above, it should be
understood by those skilled in the art that, various modifications
and equivalents can be made to the technical solutions of the
present application without departing from the spirit and scope of
the present application, all of which should be contained within
the scope of the claims of the present application.
* * * * *