U.S. patent application number 14/409246 was filed with the patent office on 2015-06-18 for pump fixing structure and pump.
The applicant listed for this patent is Nidec Sankyo Corporation. Invention is credited to Makoto Fujishima, Takaji Harada.
Application Number | 20150167694 14/409246 |
Document ID | / |
Family ID | 49768603 |
Filed Date | 2015-06-18 |
United States Patent
Application |
20150167694 |
Kind Code |
A1 |
Harada; Takaji ; et
al. |
June 18, 2015 |
PUMP FIXING STRUCTURE AND PUMP
Abstract
A pump fixing structure may include a pump including a pump
part, motor part, and a fixing base. The pump part may include an
outlet port, inlet port and an impeller. The motor part may rotate
the impeller and may include a stator which includes a drive coil
and a stator core; and a motor case integrally molded with the
stator, the motor case structuring an outer peripheral face of the
motor part. The outer peripheral face is formed in a substantially
circular truncated cone face shape having a draft angle for drawing
the motor case from a die. The pump part may include a fixed part
fixed to the fixing base. The fixing base may include a bent metal
plate and is provided with a motor support part disposed on a lower
side. A buffer member may be disposed between the motor part and
the motor support part.
Inventors: |
Harada; Takaji; (Suwa-gun,
JP) ; Fujishima; Makoto; (Suwa-gun, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Nidec Sankyo Corporation |
Suwa-gun, Nagano |
|
JP |
|
|
Family ID: |
49768603 |
Appl. No.: |
14/409246 |
Filed: |
June 6, 2013 |
PCT Filed: |
June 6, 2013 |
PCT NO: |
PCT/JP2013/065641 |
371 Date: |
December 18, 2014 |
Current U.S.
Class: |
417/363 ;
417/423.7 |
Current CPC
Class: |
F04D 13/0693 20130101;
F05D 2300/171 20130101; F04D 29/605 20130101; F05D 2300/501
20130101; F04D 29/669 20130101; F04D 13/064 20130101; F04D 29/026
20130101; F04D 29/426 20130101; F05D 2300/43 20130101; F04D 1/04
20130101; F04D 13/0606 20130101; F04D 29/628 20130101 |
International
Class: |
F04D 29/62 20060101
F04D029/62; F04D 29/42 20060101 F04D029/42; F04D 1/04 20060101
F04D001/04; F04D 13/06 20060101 F04D013/06; F04D 29/66 20060101
F04D029/66 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 18, 2012 |
JP |
2012-136593 |
Claims
1. A pump fixing structure comprising: a pump comprising a pump
part and a motor part; and a fixing base to which the pump is
fixed; wherein the pump part comprises an outlet port and an inlet
port for fluid and an impeller disposed in an inside of the pump
part; wherein the motor part is structured to rotate the impeller
and comprises: a stator which comprises a drive coil and a stator
core around which the drive coil is wound; and a motor case which
is formed of resin and is integrally molded with the stator, the
motor case structuring an outer peripheral face of the motor part;
wherein the outer peripheral face of the motor part is formed in a
substantially circular truncated cone face shape having a draft
angle for drawing the motor case from a die which is used when the
stator and the motor case are integrally molded; wherein the pump
part comprises a fixed part which is fixed to the fixing base;
wherein the fixing base comprises a bent metal plate and is
provided with a motor support part disposed on a lower side with
respect to the motor part; and wherein a buffer member having
elasticity is disposed between the motor part and the motor support
part.
2. The pump fixing structure according to claim 1, wherein the
fixing base is formed in a substantially angular groove shape which
is provided with the motor support part formed in a substantially
rectangular shape and side face parts which are bent in a lower
direction from each of a pair of opposite sides of the motor
support part formed in the substantially rectangular shape, the
fixed part is fixed to one of two side face parts, a space is
formed between the motor part and the motor support part, and the
motor part and the motor support part arc contacted with contact
the buffer member.
3. The pump fixing structure according to claim 2, wherein a second
buffer member having elasticity is disposed between the side face
part and the fixed part.
4. The pump fixing structure according to claim 3, wherein the
motor support part is formed with an engaging hole with which a
part of the buffer member is engaged, and the buffer member is
formed with an engaging projection which is engaged with the
engaging hole.
5. A pump comprising: a pump part comprising an outlet port and an
inlet port for fluid and an impeller disposed in an inside of the
pump part; and a motor part structured to rotate the impeller;
wherein the pump is fixed to a fixing base, which is formed by
bending a metal plate and is provided with a motor support part
disposed on a lower side with respect to the motor part, through a
buffer member having elasticity disposed between the motor part and
the motor support part; wherein the motor part comprises: a stator
which comprises a drive coil and a stator core around which the
drive coil is wound; and a motor case which is formed of resin and
is integrally molded with the stator, the motor case structuring an
outer peripheral face of the motor part; wherein the outer
peripheral face of the motor part is formed in a substantially
circular truncated cone face shape having a draft angle for drawing
the motor case from a die which is used when the stator and the
motor case are integrally molded; wherein the pump part comprises a
fixed part which is fixed to the fixing base; wherein the motor
part comprises a connector for supplying structured to supply an
electric current to the drive coil, the connector is integrated
with the motor case so as to protrude from an outer peripheral face
of the motor case when the stator and the motor case are integrally
molded, and when viewed in an axial direction of the motor part, a
gate mark which is a mark of a gate of the die is formed on the
motor case on an opposite side to the connector so as to interpose
an axial center of the motor part therebetween.
6. The pump according to claim 5, wherein the motor case is formed
with a gate mark formed part where the gate mark is formed on its
surface so as to protrude to an outer side in a radial direction of
the motor part.
7. A pump comprising: a pump part comprising an outlet port and an
inlet port for fluid and an impeller which is disposed in an inside
of the pump part; and a motor part structured to rotate the
impeller; wherein the pump is fixed to a fixing base, which is
formed by bending a metal plate and is provided with a motor
support part disposed on a lower side with respect to the motor
part, through a buffer member having elasticity disposed between
the motor part and the motor support part; wherein the motor part
comprises: a stator which comprises a drive coil and a stator core
around which the drive coil is wound; and a motor case which is
formed of resin and is integrally molded with the stator, the motor
case structuring an outer peripheral face of the motor part;
wherein the outer peripheral face of the motor part is formed in a
substantially circular truncated cone face shape having a draft
angle for drawing the motor case from a die which is used when the
stator and the motor case are integrally molded; wherein the pump
part comprises a fixed part which is fixed to the fixing base; and
wherein the motor case is formed of BMC (Bulk Molding
Compound).
8. A pump comprising: a pump part comprising an outlet port and an
inlet port for fluid and comprising an impeller which is disposed
in an inside of the pump part; and a motor part structured to
rotate the impeller; wherein the pump is fixed to a fixing base,
which is formed in a substantially angular groove shape provided
with a motor support part formed in a substantially rectangular
shape and disposed on a lower side relative to the motor part, and
side face parts which are bent in a lower direction from each of a
pair of opposite sides of the motor support part formed in the
substantially rectangular shape, through a buffer member having
elasticity disposed between the motor part and the motor support
part; wherein the motor part comprises: a stator which comprises a
drive coil and a stator core around which the drive coil is wound;
and a motor case which is formed of resin and is integrally molded
with the stator, the motor case structuring an outer peripheral
face of the motor part; wherein the outer peripheral face of the
motor part is formed in a substantially circular truncated cone
face shape having a draft angle for drawing the motor case from a
die which is used when the stator and the motor case are integrally
molded; wherein the pump part comprises a fixed part which is fixed
to the fixing base; wherein the fixed part is fixed to one of the
side face parts of the fixing base, wherein a space is formed
between the motor part and the motor support part; wherein the
motor part and the motor support part contact the buffer member;
wherein a second buffer member having elasticity is disposed
between the side face part and the fixed part; wherein the motor
part comprises a rotor which is disposed on an inner peripheral
side with respect to the stator, the stator core comprises an outer
peripheral core part in a substantially cylindrical shape which is
disposed on an outer peripheral side with respect to the drive
coil, and at least a part of a gate mark which is a mark of a gate
of the die and at least a part of the outer peripheral core part
are overlapped with each other in a radial direction of the motor
part.
9. The pump fixing structure according to claim 1, wherein the pump
part comprises a pump case which is formed with the outlet port and
the inlet port, the pump case is formed with a flange part for
fixing the motor case, the flange part protrudes to an outer side
in a radial direction relative to an outer peripheral face of the
motor case, and a side face on a motor case side of the flange part
which is protruded to the outer side is the fixed part which is
fixed to the fixing base.
10. The pump fixing structure according to claim 9, wherein the
fixing base is formed in a shape which is provided with the motor
support part to support the outer peripheral face of the motor case
and side face parts which are bent from both sides of the motor
support part, one of the side face parts of the fixing base is
fixed to the flange part, a space is formed between the outer
peripheral face of the motor case and the motor support part, and
the outer peripheral face and the motor support part contact the
buffer member.
11. The pump fixing structure according to claim 10, wherein a
second buffer member having elasticity is disposed between the side
face part and the flange part.
12. The pump fixing structure according to claim 10, wherein a
flange part of a partition member which defines a pump chamber
together with the pump case is abutted with the flange part of the
pump case and thereby the pump chamber is formed by an inside of
the pump case and an inside of the partition member, a rotor which
faces the stator through the partition member is rotationally
supported on an inner side with respect to the partition member,
the motor case is integrally molded with the stator and the
partition member formed in a bottomed cylindrical shape, and a
plurality of protruded parts for screws to fix the motor part to
the flange part of the pump case is formed on the outer peripheral
face of the motor case.
13. The pump fixing structure according to claim 10, wherein the
motor part comprises a connector structured to supply an electric
current to the drive coil; the connector is integrated with the
motor case so as to protrude from an outer peripheral face of the
motor case when the stator and the motor case are integrally
molded; and when viewed in an axial direction of the motor part, a
gate mark which is a mark of a gate of the die is formed on the
motor case on an opposite side to the connector so as to interpose
an axial center of the motor part therebetween.
14. The pump fixing structure according to claim 13, wherein the
motor case is formed with a gate mark formed part where the gate
mark is formed on its surface so as to protrude to an outer side in
a radial direction of the motor part.
15. The pump fixing structure according to claim 10, wherein the
motor case is formed of BMC (Bulk Molding Compound).
16. The pump fixing structure according to claim 10, wherein the
motor part comprises a rotor disposed on an inner peripheral side
with respect to the stator; the stator core is provided with an
outer peripheral core part in a substantially cylindrical shape
which is disposed on an outer peripheral side with respect to the
drive coil; and at least a part of a gate mark which is a mark of a
gate of the die and at least a part of the outer peripheral core
part are overlapped with each other in a radial direction of the
motor part.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This is the U.S. national stage of application No.
PCT/JP2013/065641 filed on Jun. 6, 2013. Priority under 35 U.S.C.
.sctn.119(a) and 35 U.S.C. .sctn.365(b) is claimed from Japanese
Application No. 2012-136593, filed Jun. 18, 2012, the disclosure of
which are also incorporated herein by reference.
FIELD OF THE INVENTION
[0002] The present invention relates to a pump fixing structure for
fixing a pump to a fixing base. Further, the present invention
relates to a pump which structures the pump fixing structure.
BACKGROUND
[0003] Conventionally, a pump fixing device for fixing a pump to a
base has been known (see, for example, Patent Literature 1). In
Patent Literature 1, a pump is fixed to a base through an abutting
part. Further, the pump includes a pump part having an outlet port
and an inlet port for fluid, and a motor part for rotating an
impeller which is disposed in an inside of the pump part. An outer
peripheral face of the motor part is formed in a cylindrical face
shape. The abutting part and the base are formed by bending a metal
plate in a predetermined shape. Further, the abutting part is
structured of a curved face part in a circular arc shape to which
an outer peripheral face of the motor part formed in a cylindrical
face shape is fixed, side face parts which are bent to a lower
direction from both ends of the curved face part, and bottom face
parts extended from lower ends of the side face parts in a
horizontal direction. The base is structured of an upper face part
to which the bottom face parts of the abutting part are fixed and
side face parts which are bent from both ends of the upper face
part to a lower direction.
[0004] Further, conventionally, as a pump including a pump part
having an outlet port and an inlet port for fluid and a motor part
for rotating an impeller which is disposed in an inside of the pump
part, a pump has been known which includes a stator structuring a
motor part and a mold part made of resin which covers the stator
(see, for example, Patent Literature 2). In the pump described in
Patent Literature 2, the mold part is integrally formed with the
stator and structures an outer peripheral face of the motor part.
In a pump having a mold part which is integrally formed with a
stator like the pump described in Patent Literature 2, an outer
peripheral face of the motor part is commonly formed in a circular
truncated cone face shape having a draft angle for drawing out the
mold part from a die which is used when the stator and the mold
part are integrally molded.
PATENT LITERATURE
[0005] [PTL 1] Examined Utility Model Application Publication Hei
8-7199
[0006] [PTL 2] Japanese Patent Laid-Open No. 2008-109848
[0007] In the pump described in Patent Literature 1, a rotor
structuring the motor part is rotated and thus vibration is easily
occurred in the motor part. On the other hand, in this pump, an
outer peripheral face of the motor part is fixed to the curved face
part of the abutting part which is formed of a metal plate and the
bottom face parts of the abutting part are fixed to the base and
thus vibration occurred in the motor part is easily transmitted to
the base through the abutting part. Therefore, in order to suppress
transmission of vibration from the motor part to the base, it is
preferable that a space is provided between an upper face part of
the base and the motor part and, for example, the pump part is
fixed to a side face part of the base. However, even in this case,
when a fixed part of the pump part fixed to the side face part of
the base is deformed with a lapse of time, the upper face part of
the base and the motor part may be contacted with each other and
thus vibration of the motor part may be transmitted to the
base.
SUMMARY
[0008] In view of the problem described above, at least an
embodiment of the present invention provides a pump fixing
structure for fixing a pump having a pump part and a motor part to
a fixing base, the pump fixing structure being capable of
suppressing transmission of vibration from the motor part to the
fixing base even when a fixed part of the pump part which is fixed
to the fixing base is deformed due to a lapse of time. Further, at
least an embodiment of the present invention provides a pump which
structures the pump fixing structure.
[0009] To achieve the above, at least an embodiment of the present
invention provides a pump fixing structure for fixing a pump to a
fixing base. The pump includes a pump part which has an outlet port
and an inlet port for fluid and is disposed with an impeller in its
inside, and a motor part for rotating the impeller. The motor part
includes a stator having a drive coil and a stator core around
which the drive coil is wound, and a motor case which is formed of
resin and is integrally molded with the stator to structure an
outer peripheral face of the motor part. The outer peripheral face
of the motor part is formed in a substantially circular truncated
cone face shape having a draft angle for drawing the motor case
from a die used when the stator and the motor case are integrally
molded. The pump part is provided with a fixed part which is fixed
to the fixing base, the fixing base is formed by bending a metal
plate and is provided with a motor support part disposed on a lower
side with respect to the motor part, and a buffer member having
elasticity is disposed between the motor part and the motor support
part.
[0010] In the pump fixing structure in accordance with at least an
embodiment of the present invention, a buffer member having
elasticity is disposed between the motor support part disposed on a
lower side with respect to the motor part and the motor part.
Therefore, according to at least an embodiment of the present
invention, even when the fixed part of the pump part which is fixed
to the fixing base is deformed with a lapse of time, the motor part
is prevented from contacting with the motor support part of the
fixing base. Therefore, in at least an embodiment of the present
invention, even when the fixed part of the pump part which is fixed
to the fixing base is deformed with a lapse of time, transmission
of vibration from the motor part to the fixing base is
suppressed.
[0011] Further, in the pump fixing structure in accordance with at
least an embodiment of the present invention, a buffer member is
disposed between the motor support part disposed on a lower side
with respect to the motor part and the motor part. Therefore, even
when an outer peripheral face of the motor part is formed in a
substantially circular truncated cone face shape having a draft
angle, the motor part is supported by the buffer member in a stable
state.
[0012] In at least an embodiment of the present invention, for
example, the fixing base is formed in a substantially angular
groove shape which is provided with the motor support part formed
in a substantially rectangular shape and side face parts which are
bent in a lower direction from each of a pair of opposite sides of
the motor support part formed in the substantially rectangular
shape, the fixed part is fixed to one of two side face parts, a
space is formed between the motor part and the motor support part,
and the motor part and the motor support part are contacted with
the buffer member. In this case, it is preferable that a second
buffer member having elasticity is disposed between the side face
part and the fixed part. According to this structure, vibration of
the motor part is suppressed from being transmitted to the fixing
base through the pump part by the second buffer member.
[0013] In at least an embodiment of the present invention, it is
preferable that the motor support part is formed with an engaging
hole with which a part of the buffer member is engaged, and the
buffer member is formed with an engaging projection which is
engaged with the engaging hole. According to this structure,
positional displacement of the buffer member with respect to the
motor support part is prevented.
[0014] In a pump which structures the pump fixing structure in
accordance with at least an embodiment of the present invention, it
is preferable that the motor part includes a connector for
supplying an electric current to the drive coil, the connector is
integrated with the motor case so as to protrude from the outer
peripheral face of the motor case when the stator and the motor
case are integrally molded and, when viewed in an axial direction
of the motor part, a gate mark which is a mark of a gate of the die
is formed on the motor case on an opposite side to the connector so
as to interpose an axial center of the motor part therebetween. In
this case, a shape of the motor case when viewed in an axial
direction of the motor part can be set to be line symmetric with
respect to a line connecting the center of the connector and the
gate mark. Therefore, when the stator and the motor case are to be
integrally molded, resin is easily flowed uniformly from the gate
toward a portion where the connector is disposed.
[0015] In at least an embodiment of the present invention, it is
preferable that the motor case is formed with a gate mark formed
part where the gate mark is formed on its surface so as to protrude
to an outer side in a radial direction of the motor part. According
to this structure, a wall thickness of the gate mark formed part
can be made larger than other portions and thus, when the stator
and the motor case are to be integrally molded, resin is easily
flowed from the gate into an inside of the die.
[0016] In a pump which structures the pump fixing structure in
accordance with at least an embodiment of the present invention, it
is preferable that the motor case is formed of BMC (Bulk Molding
Compound). In this case, heat radiation property and vibration
absorption property of the motor case are enhanced.
[0017] In a pump which structures the pump fixing structure in
accordance with at least an embodiment of the present invention,
the motor part includes a rotor which is disposed on an inner
peripheral side with respect to the stator, the stator core is
provided with an outer peripheral core part in a substantially
cylindrical shape which is disposed on an outer peripheral side
with respect to the drive coil, and at least a part of a gate mark
which is a mark of a gate of the die and at least a part of the
outer peripheral core part are overlapped with each other in a
radial direction of the motor part. In this case, when the stator
and the motor case are to be integrally molded, injection pressure
of the resin is hard to be directly applied to the drive coil and
the like. Therefore, when the stator 12 and the motor case 14 are
to be integrally molded, damage of the drive coils 22 and the like
can be prevented.
[0018] As described above, in the pump fixing structure in
accordance with at least an embodiment of the present invention,
even when the fixed part of the pump part which is fixed to the
fixing base is deformed with a lapse of time, transmission of
vibration from the motor part to the fixing base is suppressed.
Further, in the pump in accordance with at least an embodiment of
the present invention, effects can be attained such that, when the
stator and the motor case are to be integrally molded, resin is
easily flowed uniformly from the gate toward a portion where the
connector is disposed.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Embodiments will now be described, by way of example only,
with reference to the accompanying drawings which are meant to be
exemplary, not limiting, and wherein like elements are numbered
alike in several Figures, in which:
[0020] FIG. 1 is a perspective view showing a pump fixing structure
in accordance with an embodiment of the present invention.
[0021] FIG. 2 is a side view showing the pump fixing structure in
FIG. 1 which is viewed in another direction.
[0022] FIG. 3 is a rear view showing the pump fixing structure
which is viewed in the "E-E" direction in FIG. 2.
[0023] FIG. 4 is a cross-sectional view showing the "F-F" cross
section in FIG. 3.
[0024] FIG. 5 is a perspective view showing a state that a stator
shown in FIG. 4 is taken out from a motor case.
[0025] FIG. 6 is a side view showing a state that the stator and
the motor case shown in FIG. 5 are integrated with each other.
DESCRIPTION OF EMBODIMENTS
[0026] At least an embodiment of the present invention will be
described below with reference to the accompanying drawings.
(Structure of Pump Fixing Structure)
[0027] FIG. 1 is a perspective view showing a pump fixing structure
1 in accordance with an embodiment of the present invention. FIG. 2
is a side view showing the pump fixing structure 1 in FIG. 1 which
is viewed in another direction. FIG. 3 is a rear view showing the
pump fixing structure 1 which is viewed in the "E-E" direction in
FIG. 2. FIG. 4 is a cross-sectional view showing the "F-F" cross
section in FIG. 3. FIG. 5 is a perspective view showing a state
that a stator 12 shown in FIG. 4 is taken out from a motor case 14.
FIG. 6 is a side view showing a state that the stator 12 and the
motor case 14 shown in FIG. 5 are integrated with each other.
[0028] The pump fixing structure 1 in this embodiment is a
structure for fixing a pump 2 to a fixing base 3 and includes the
pump 2 and the fixing base 3 to which the pump 2 is fixed. In the
following descriptions, as shown in FIGS. 2 and 3, in respective
three directions perpendicular to each other, an axial line
direction of a motor part 7 is referred to as an "X" direction, a
direction which is perpendicular to the axial line direction of the
motor part 7 and parallel to an upper face part 3a of the fixing
base 3 is referred to as a "Y" direction, and a direction which is
perpendicular to the axial line direction of the motor part 7 and
perpendicular to the upper face part 3a of the fixing base 3 is
referred to as a "Z" direction. Further, the "X" direction is
referred to as a front and rear direction, the "Y" direction is
referred to as a right and left direction, and the "Z" direction is
referred to as an upper and lower direction. Further, in FIGS. 2
and 3 and the like, the "X1" direction side is referred to as a
"front" side, the "X2" direction side is a "rear" (back) side, the
"Y1" direction side is a "right" side, the "Y2" direction side is a
"left" side, the "Z1" direction side is an "upper" side, and the
"Z2" direction side is a "lower" side.
[0029] The pump 2 is a pump which is referred to as a canned pump,
which includes a pump part 6 in which an impeller 5a (see FIG. 4)
is disposed in its inside and a motor part 7 for rotating the
impeller 5a. The pump part 6 structures a front end side portion of
the pump 2 in an axial line direction of the motor part 7, and the
motor part 7 structures a rear end side portion of the pump 2 in
the axial line direction of the motor part 7. The impeller 5a
structures a front end side portion in an axial line direction of
an impeller member 5.
[0030] The pump part 6 includes a pump case 9 which is formed with
an outlet port 9a and an inlet port 9b for fluid. The outlet port
9a is formed in a cylindrical tube shape which protrudes toward an
obliquely left upper direction and the inlet port 9b is formed in a
cylindrical tube shape which protrudes toward a front direction. A
rear end side of the pump case 9 is formed with a flange part 9c
for fixing the motor part 7 to the pump part 6 and for fixing the
pump 2 to the fixing base 3. A lower end side of the flange part 9c
is formed as a fixed part 9d which is fixed to the fixing base 3.
An inside of the pump case 9 is a part of a pump chamber 10 as
shown in FIG. 4.
[0031] The motor part 7 includes a rotor 11, a stator 12, a
partition member 13 which defines the pump chamber 10 together with
the pump case 9, and a motor case 14 which structures an outer
peripheral face of the motor part 7. The rotor 11 is disposed on an
inner peripheral side with respect to the stator 12. In other
words, the motor structuring the motor part 7 is an inner rotor
type motor.
[0032] The partition member 13 is formed of resin material.
Further, the partition member 13 is formed in a bottomed
cylindrical tube shape with a flange and is disposed between the
rotor 11 and the stator 12. The flange part 13a of the partition
member 13 is abutted with a flange part 9c of the pump case 9, and
the pump chamber 10 is formed of an inside of the pump case 9 and
an inside of the partition member 13. A seal member ("O"-ring) 15
is disposed between the flange part 9c and the flange part 13a for
securing sealability of the pump chamber 10.
[0033] The rotor 11 includes a drive magnet 16 and a cylindrical
shaped sleeve 17. A rear end side portion of the impeller member 5
is a holding part 5b formed in a substantially cylindrical shape.
The holding part 5b structures a part of the rotor 11, and the
drive magnet 16 is fixed to an outer peripheral face of the holding
part 5b and the sleeve 17 is fixed to an inner peripheral face of
the holding part 5b. The rotor 11 is rotatably supported by a fixed
shaft 18 which is fixed to the pump case 9 and the partition member
13 with the front and rear direction as an axial direction. Two
thrust bearings 19 are attached to the fixed shaft 18 so as to
sandwich the sleeve 17 in the front and rear direction. The rotor
11 is disposed in an inside of the pump chamber 10.
[0034] The stator 12 includes a drive coil 22, a stator core 23 and
a bobbin 24, and is formed in a substantially cylindrical tube
shape as a whole. The stator core 23 is, for example, a laminated
core which is formed by laminating thin magnetic plates made of
magnetic material, and the stator core 23 is provided with an outer
peripheral core part 23a in a substantially cylindrical shape which
structures an outer peripheral face of the stator core 23 and a
plurality of salient pole parts 23b which protrude from the outer
peripheral core part 23a to an inner side in a radial direction
(see FIG. 5). A width of the outer peripheral core part 23a in a
front and rear direction is set to be equal to a width of the
salient pole part 23b in the front and rear direction.
[0035] The bobbin 24 is formed in a tube shape with flanges which
is provided with flange parts at both ends. The drive coil 22 is
wound around an outer peripheral face of the bobbin 24. The bobbin
24 around which the drive coil 22 is wound is fitted to the salient
pole part 23b from an inner side in a radial direction, and the
drive coil 22 is wound around the salient pole part 23b through the
bobbin 24. Further, the bobbins 24 around which the drive coil 22
is wound are disposed on an inner peripheral side with respect to
the outer peripheral core part 23a. Both end parts of the drive
coil 22 are electrically connected with terminal pins 25 which are
fixed to the bobbin 24.
[0036] Circuit boards 26 and 27 provided with a drive circuit and a
control circuit are fixed to a rear face side of a bottom part 13b
of the partition member 13 and are disposed on a rear end side of
the stator 12. The circuit board 26 and the circuit board 27 are
electrically connected with each other. The terminal pin 25 is
electrically connected with the circuit board 26 by soldering or
the like. Various electronic components are mounted on the circuit
board 27. Further, a connector 28 for supplying an electric current
to the drive coil 22 is mounted on the circuit board 27. In FIG. 6,
the circuit boards 26 and 27 and the connector 28 are not shown.
Further, an electric current is supplied to the drive coil 22
through the connector 28 and, in addition, exchanges of various
signals and the like are performed through the connector 28.
[0037] The motor case 14 is formed of resin. Specifically, the
motor case 14 is formed of BMC (Bulk Molding Compound). Further,
the motor case 14 is integrally molded with the stator 12 and the
partition member 13 so as to cover an outer peripheral side and a
rear face side of the stator 12 and is formed in a substantially
bottomed cylindrical tube shape. A die (not shown) which is used
for integrally molding the stator 12 and the like with the motor
case 14 is structured so as to be divided in the front and rear
direction, and an outer peripheral face of the motor case 14 is
formed in a substantially circular truncated cone face shape having
a draft angle for drawing the motor case 14 from the die. In other
words, since the outer peripheral face of the motor case 14 is an
outer peripheral face of the motor part 7, the outer peripheral
face of the motor part 7 is formed in a substantially circular
truncated cone face shape. Specifically, the outer peripheral face
of the motor part 7 is formed in a substantially circular truncated
cone face shape whose outer diameter gradually becomes smaller
toward the rear end side of the motor case 14.
[0038] In this embodiment, when the stator 12 and the like and the
motor case 14 are to be integrally molded, the connector 28 is
mounted on the circuit board 27 and the circuit boards 26 and 27
are fixed to the partition member 13. The circuit boards 26 and 27
are integrated with the motor case 14 so as to be covered by the
motor case 14 when the stator 12 and the like and the motor case 14
are integrally molded. Further, when the stator 12 and the like and
the motor case 14 are integrally molded, the connector 28 is
integrated with the motor case 14 so that a part of the connector
28 is protruded from the outer peripheral face of the motor case
14.
[0039] A connector arrangement part 14a where the connector 28 is
disposed and a gate mark formed part 14c where a gate mark 14b,
i.e., a mark of a gate of a die used when the stator 12 and the
like and the motor case 14 are integrally molded is formed are
formed on an outer peripheral side of the motor case 14 so as to
protrude to an outer side in the radial direction. Further, four
protruded parts 14dfor screws for fixing the motor part 7 to the
pump part 6 are formed on the outer peripheral face of the motor
case 14 so as to protrude from the outer peripheral face of the
motor part 7 to an outer side in the radial direction.
[0040] The connector arrangement part 14a is protruded from the
outer peripheral face of the motor part 7 to the left direction. On
the other hand, the gate mark formed part 14c is protruded to the
right direction. In other words, when viewed in the front and rear
direction which is an axial line direction of the motor part 7, as
shown in FIG. 3, the gate mark formed part 14c where the gate mark
14b is formed is formed on an opposite side to the connector
arrangement part 14a interposing an axial center of the motor part
7 therebetween. In this embodiment, a shape of the motor case 14
when viewed in the axial direction of the motor part 7 is formed to
be line symmetric with respect to a line connecting the center of
the connector 28 with the center of the gate mark 14b which is
parallel to the right and left direction. The connector arrangement
part 14a and the gate mark formed part 14c are formed on almost
entire region of the motor case 14 in the front and rear direction.
Further, a left side face of the connector arrangement part 14a and
a right side face of the gate mark formed part 14c are
substantially parallel to the "Z-X" plane which is structured of
the "Z" direction and the "X" direction.
[0041] The gate mark 14b is formed so as to slightly protrude to
the right direction from the right side face (surface) of the gate
mark formed part 14c. Further, the gate mark 14b is formed at a
center position in the upper and lower direction of the right side
face of the gate mark formed part 14c and is formed in a
predetermined range in the front and rear direction of the right
side face of the gate mark formed part 14c. As shown in FIG. 6, a
part of the gate mark 14b is overlapped with the outer peripheral
core part 23a when viewed in the right and left direction. In other
words, a part of the gate mark 14b is overlapped with the outer
peripheral core part 23a in the radial direction of the motor part
7. Specifically, a part on the front end side of the gate mark 14b
is overlapped with the outer peripheral core part 23a in the radial
direction of the motor part 7.
[0042] Four protruded parts 14d for screws are formed so as to
respectively protrude from the outer peripheral face of the motor
part 7 toward an obliquely right upper direction, an obliquely
right lower direction, an obliquely left upper direction and an
obliquely left lower direction. The protruded part 14d for a screw
is formed with a screw hole 14e with which a screw 30 is engaged.
The motor part 7 is fixed to the pump part 6 by four screws 30.
[0043] The fixing base 3 is formed by bending one metal plate made
of a steel plate or the like. Further, the fixing base 3 is
structured of an upper face part 3a, which is formed in a
substantially rectangular shape and is provided with a flat face as
a motor support part, side face parts 3b which are disposed on both
sides in the front and rear direction and are formed so as to be
bent from a pair of opposite sides of the upper face part 3a to a
lower direction opposite to the direction that the pump 2 is
placed, and bottom face parts 3c forming flanges which are formed
so as to be bent from lower ends of the side face parts 3b to an
outer direction in the front and rear direction. The fixing base 3
is formed in a substantially rectangular groove shape in which the
upper face part 3a is a bottom face and the side face parts 3b are
wall faces. The bottom face parts 3c are fixed to a frame or the
like of a predetermined device in which the pump 2 is used.
[0044] The side face part 3b disposed on the front side of the two
side face parts 3b is fixed by screws 31 to the fixed part 9d of
the pump case 9 which is located on a lower side relative to the
outer peripheral face of the motor part 7. The fixed part 9d is
located on a lower side relative to the outer peripheral face of
the motor case 14 and, in a state that the fixed part 9d is fixed
to the side face part 3b, a space is formed between the upper face
part 3a and the outer peripheral face of the motor part 7 facing
the upper face part 3a. The upper face part 3a is disposed on a
lower side with respect to the motor part 7. A buffer member 34 is
disposed between the lower end of the motor part 7 and the upper
face of the upper face part 3a. In other words, an abutting part
14f provided on a lower end of the motor part 7, which is provided
on a portion except the connector arrangement part 14a, the gate
mark 14b, the gate mark formed part 14c and the protruded parts 14d
for screws protruded to an outer side in the radial direction from
the cylindrical outer peripheral face of the motor part 7, and a
flat face of the upper face part 3a are disposed so as to face each
other and the buffer member 34 is disposed between the abutting
part 14f of the motor part 7 and the upper face part 3a. In a state
that the abutting part 14f and the buffer member 34 are abutted
with each other, the connector arrangement part 14a, the gate mark
14b, the gate mark formed part 14cand the protruded parts 14d for
screws protruded to an outer side in the radial direction from the
cylindrical outer peripheral face of the motor part 7 are provided
at positions so as not to contact with the buffer member 34 and the
upper face part 3a. As described above, the abutting part 14f
formed of a flat outer peripheral face of the motor part 7 and the
buffer member 34 are disposed so as to face each other and thus the
motor part 7 and the fixing base 3 can be closely disposed and it
is suitable to reduce the size of the device. In addition, in this
embodiment, the outlet port 9a is provided so as to protrude toward
an upper side with respect to the outer peripheral face of the
motor part 7 and the abutting part 14f is provided on the outer
peripheral face on a lower side of the motor part 7, and the fixed
part 9d is provided so as to protrude toward a lower side with
respect to the outer peripheral face of the motor part 7.
Therefore, a height of the pump 2 fixed to the fixing base 3 can be
structured low and thus it is suitable to reduce the size. Further,
a buffer member 35 as a second buffer member is disposed between a
front face of the side face part 3b disposed on the front side and
a rear face of the fixed part 9d.
[0045] The buffer member 34 is formed of elastic material having
elasticity. The buffer member 34 in this embodiment is, for
example, a rubber bushing formed of rubber. The buffer member 34 is
structured of a large diameter part 34a formed in a columnar shape
and a small diameter part 34b as an engaging projection which is
formed in a columnar shape whose outer diameter is smaller than
that of the large diameter part 34a. The buffer member 34 is formed
in a stepped columnar shape. The small diameter part 34b is engaged
with a circular engaging hole formed in the upper face part 3a of
the fixing base 3 and the large diameter part 34a is disposed on
the upper face side of the upper face part 3a. As shown in FIG. 2,
a space is formed between the motor part 7 and the upper face part
3a. Further, the lower end of the motor part 7 and the upper face
of the large diameter part 34a are contacted with each other and
the upper face of the upper face part 3a and the under face of the
large diameter part 34a are contacted with each other. In this
embodiment, the engaging hole formed in the upper face part 3a
penetrates through the upper face part 3a and a lower end side of
the small diameter part 34b is protruded to a lower side relative
to the under face of the upper face part 3a.
[0046] The buffer member 35 is formed of elastic material having
elasticity. The buffer member 35 in this embodiment is, for
example, a rubber plate formed of rubber and is formed in a flat
plate shape. The buffer member 35 is fixed between the fixed part
9d and the side face part 3b by the screw 31 in a state that the
buffer member 35 is sandwiched between the fixed part 9d and the
side face part 3b.
Principal Effects in this Embodiment
[0047] As described above, in this embodiment, the buffer member 34
is disposed between the upper face part 3a of the fixing base 3 and
the motor part 7. Therefore, in this embodiment, vibration
transmitted from the motor part 7 to the upper face part 3a can be
suppressed by the buffer member 34. Further, in this embodiment,
the buffer member 35 is disposed between the side face part 3b of
the fixing base 3 and the fixed part 9d of the pump case 9 and thus
vibration of the motor part 7 can be suppressed from being
transmitted to the side face part 3b through the pump part 6 by the
buffer member 35.
[0048] Further, in this embodiment, the buffer member 34 is
disposed between the upper face part 3a and the motor part 7 and
thus, even when the fixed part 9d of the pump case 9 fixed to the
side face part 3b of the fixing base 3 is deformed with a lapse of
time, the motor part 7 can be prevented from contacting with the
upper face part 3a. Therefore, in this embodiment, even when the
fixed part 9d is deformed with a lapse of time, transmission of
vibration from the motor part 7 to the fixing base 3 can be
suppressed. In addition, in this embodiment, the buffer member 34
is disposed between the upper face part 3a and the motor part 7 and
thus, even when the outer peripheral face of the motor part 7 is
formed in a substantially circular truncated cone face shape having
a draft angle, the motor part 7 can be supported by the buffer
member 34 in a stable state.
[0049] In this embodiment, the small diameter part 34b of the
buffer member 34 is engaged with the engaging hole formed in the
upper face part 3a. Therefore, in this embodiment, positional
displacement of the buffer member 34 with respect to the upper face
part 3a can be prevented.
[0050] In this embodiment, when viewed in the front and rear
direction which is the axial direction of the motor part 7, the
gate mark formed part 14c where the gate mark 14b is formed is
formed on an opposite side to the connector arrangement part 14a so
as to interpose the axial center of the motor part 7 therebetween,
and a shape of the motor case 14 when viewed in the axial line
direction of the motor part 7 is formed to be line symmetric with
respect to a line connecting the center of the connector 28 with
the center of the gate mark 14b which is parallel to the right and
left direction. Therefore, in this embodiment, when the stator 12
and the like and the motor case 14 are to be integrally molded,
resin is easily flowed uniformly from a gate of the die toward a
portion where the connector 28 is disposed. Further, in this
embodiment, the gate mark formed part 14c is formed so as to
protrude to an outer side in the radial direction of the motor part
7 and a wall thickness of the gate mark formed part 14c is set to
be thicker than that of the other portion of the motor case 14
except the connector arrangement part 14a and the protruded parts
14d for screws. Therefore, in this embodiment, when the stator 12
and the like and the motor case 14 are to be integrally molded,
resin is easily flowed into an inside of the die from the gate.
[0051] In this embodiment, a part of the gate mark 14b is
overlapped with the outer peripheral core part 23a in the radial
direction of the motor part 7. Therefore, when the stator 12 and
the like and the motor case 14 are to be integrally molded,
injection pressure of resin is hard to be directly applied to the
drive coils 22 and the like. As a result, according to this
embodiment, when the stator 12 and the like and the motor case 14
are to be integrally molded, damage of the drive coils 22 can be
prevented.
[0052] In this embodiment, the motor case 14 is formed of BMC.
Therefore, according to this embodiment, heat radiation property
and vibration absorption property of the motor case 14 can be
enhanced.
Other Embodiments
[0053] Although the present invention has been shown and described
with reference to a specific embodiment, various changes and
modifications will be apparent to those skilled in the art from the
teachings herein.
[0054] In the embodiment described above, the buffer member 34 is
formed in a stepped columnar shape comprised of the large diameter
part 34a and the small diameter part 34b. However, the present
invention is not limited to this embodiment. For example, the
buffer member 34 may be formed in a columnar shape comprised of
only the large diameter part 34a or may be formed in a flat plate
shape or in a block shape. In this case, for example, the buffer
member 34 is fixed to an upper face of the upper face part 3a of
the fixing base 3 by an adhesive or the like.
[0055] In the embodiment described above, the buffer member 35 is
disposed between the side face part 3b of the fixing base 3 and the
fixed part 9d of the pump case 9. However, the present invention is
not limited to this embodiment. For example, when vibration of the
motor part 7 is hard to be transmitted to the side face part 3b
through the pump part 6, no buffer member 35 may be disposed
between the side face part 3b and the fixed part 9d.
[0056] In the embodiment described above, the motor case 14 is
formed of BMC, but the motor case 14 may be formed of resin other
than BMC. Further, in the embodiment described above, when viewed
in the front and rear direction which is the axial direction of the
motor part 7, the gate mark 14b is formed on the opposite side to
the connector arrangement part 14a so as to interpose the axial
center of the motor part 7 therebetween, but the gate mark 14b may
be formed at another arbitrary position.
[0057] In the embodiment described above, a part of the gate mark
14b is overlapped with the outer peripheral core part 23a in the
radial direction of the motor part 7. However, the present
invention is not limited to this embodiment. For example, all of
the gate mark 14b may be overlapped with the outer peripheral core
part 23a in the radial direction of the motor part 7. In this case,
when the stator 12 and the like and the motor case 14 are to be
integrally molded, damage of the drive coils 22 and the like can be
prevented effectively. In accordance with an embodiment of the
present invention, it may be structured that the gate mark 14b and
the outer peripheral core part 23a are not overlapped with each
other in the radial direction of the motor part 7.
[0058] While the description above refers to particular embodiments
of the present invention, it will be understood that many
modifications may be made without departing from the spirit
thereof. The accompanying claims are intended to cover such
modifications as would fall within the true scope and spirit of the
present invention.
[0059] The presently disclosed embodiments are therefore to be
considered in all respects as illustrative and not restrictive, the
scope of the invention being indicated by the appended claims,
rather than the foregoing description, and all changes which come
within the meaning and range of equivalency of the claims are
therefore intended to be embraced therein.
* * * * *