U.S. patent application number 13/614157 was filed with the patent office on 2013-03-28 for motor-driven compressor.
This patent application is currently assigned to KABUSHIKI KAISHA TOYOTA JIDOSHOKKI. The applicant listed for this patent is Hiroshi FUKASAKU, Tatsuya HORIBA. Invention is credited to Hiroshi FUKASAKU, Tatsuya HORIBA.
Application Number | 20130078124 13/614157 |
Document ID | / |
Family ID | 47010275 |
Filed Date | 2013-03-28 |
United States Patent
Application |
20130078124 |
Kind Code |
A1 |
FUKASAKU; Hiroshi ; et
al. |
March 28, 2013 |
MOTOR-DRIVEN COMPRESSOR
Abstract
A motor of motor-driven compressor includes a plurality of phase
coils, and a plurality of phase wires are drawn from each of the
phase coils. The phase wires are bundled and form a phase wire
bundle. The tip portions of the phase wires are connected
electrically by a conductive ring caulked by heating. A wire joint
is formed so as to connect electrically each phase wire at the tip
portion of the phase wire bundle. A storage chamber is formed so as
to penetrate a cluster block. The wire joint is inserted in the
storage chamber. The insertion opening is closed by a cylindrical
member made of rubber.
Inventors: |
FUKASAKU; Hiroshi;
(Aichi-ken, JP) ; HORIBA; Tatsuya; (Aichi-ken,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
FUKASAKU; Hiroshi
HORIBA; Tatsuya |
Aichi-ken
Aichi-ken |
|
JP
JP |
|
|
Assignee: |
KABUSHIKI KAISHA TOYOTA
JIDOSHOKKI
Kariya-shi
JP
|
Family ID: |
47010275 |
Appl. No.: |
13/614157 |
Filed: |
September 13, 2012 |
Current U.S.
Class: |
417/410.1 |
Current CPC
Class: |
H02K 5/225 20130101 |
Class at
Publication: |
417/410.1 |
International
Class: |
F04B 35/04 20060101
F04B035/04 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 27, 2011 |
JP |
2011-211193 |
Claims
1. A motor-driven compressor comprising: a shell, an electric motor
provided in the shell, a compression portion driven by the electric
motor and compressing refrigerant, a plurality of phase coils and a
stator provided in the electric motor, a plurality of lead wires
and a plurality of phase wires drawn respectively from the
plurality of phase coils, a cluster block having a phase connector,
wherein the lead wires are connected to the phase connector, a
drive control portion of the electric motor outside of the shell
being electrically connected to the phase connector through a
conductive retainer penetrating the shell, a phase wire bundle
formed by binding the plurality of phase wires drawn respectively
from the plurality of phase coils, a wire joint formed at the tip
portion of the phase wire bundle by thermal caulking so as to form
a neutral point, wherein each phase wire is connected electrically
at the tip portion of the phase wire bundle; a storage chamber
formed in the cluster block, wherein the storage chamber has an
insertion opening on the outer periphery of the cluster block,
wherein the wire joint is inserted from the insertion opening to
the storage chamber, and a closing member closing the insertion
opening.
2. The motor-driven compressor according to claim 1, wherein the
closing member is cylindrical and has a cylindrical hole, through
which the wire joint is inserted.
3. The motor-driven compressor according to claim 2, wherein the
closing member is formed by connecting a first concave piece and a
second concave piece.
4. The motor-driven compressor according to claim 2, wherein the
closing member has a cut line which extends to the cylindrical hole
and the cut line extends from one end of the closing member to the
other end, and the closing member is developable from the cut
line.
5. The motor-driven compressor according to claims 2 through 4,
wherein the closing member has a tapering outer periphery and a
diameter of the tapering outer periphery decreases in the insertion
direction.
6. The motor-driven compressor according to claim 1, wherein the
closing member is made of rubber.
7. The motor-driven compressor according to claim 1, wherein the
storage chamber is formed into a dead end shape not penetrating the
cluster block.
8. The motor-driven compressor according to claim 1, wherein the
storage chamber and the plurality of phase connectors are arranged
in parallel.
9. The motor-driven compressor according to claim 1, wherein the
compression portion, the electric motor, and the drive control
portion are arranged in line, and the plurality of phase wires are
drawn from an end of the stator near the compression portion.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a motor-driven compressor
comprising an electric motor which is accommodated inside the
shell, wherein a phase wire bundle is formed so that a plurality of
phase wire drawn from each plural phase coils are bundled up. In
the compressor, a wire joint is formed so that each phase is
electrically connected at the tip of the phase wire bundle, and a
neutral point is formed.
[0002] In the motor-driven compressor disclosed in Japanese Utility
Model Application Publication No. 5-38368, a plurality of lead
wires which are drawn respectively from each phase coil are
connected respectively to a plurality of connecting terminals
within the cluster. A phase wire bundle is formed by bundling up
the phase wires which form the neutral point, and tip portions of
each phase wire bundle are connected as a whole to the unconnected
terminals (wire joint).
[0003] When the neutral point gets into an inner peripheral side of
the stator, the members which is to be originally located in the
inner peripheral side of the stator are prevented from assembling.
In Japanese Utility Model Application Publication No. 5-38368, the
neutral point is tied down by a thread so that the neutral point
does not sway.
[0004] In this kind of motor-driven compressor, refrigerant gas
circulates inside the motor-driven compressor at the normal
operating time. When the compressor is stopped and the refrigerant
gas is cooled, however, the liquefied refrigerant gas (liquid
refrigerant) is collected in the housing.
[0005] Therefore, when the wire joint at the neutral point is
soaked in the refrigerant collected in the housing, the wire joint
is conducted electrically to the housing through the liquid
refrigerant. When the motor-driven compressor is operated in this
situation, the electric current that flows through the wire joint
might be leaked to the housing through the liquid refrigerant.
[0006] Japanese Unexamined Patent Application Publication No.
2005-278289 discloses that the metal sleeve that is put at the tip
of the neutral point line is swaged by electrical power and
pressurization, and that an insulating cap is applied at the
neutral point terminal to prevent a short circuit between the tip
portion of the neutral point line and the winding wire in the
dynamoelectric machine. In the electric swaging (thermal caulking),
the neutral point terminal is formed by melting the insulating
coating (resin) of the neutral point wire. Therefore, it is not
necessary to remove the insulating coating in advance. It is easy
to form the neutral point terminal. Because the neutral point
terminal is covered by the insulating cap, an electric current leak
is prevented.
[0007] However, for preventing a swaying of the neutral point, it
needs time to tie phase wires down in the way that is disclosed in
Japanese Utility Model No. 5-38368. Therefore, the work efficiency
of assembling the motor-driven compressor is deteriorated.
[0008] In the thermal caulking disclosed in Japanese Unexamined
Patent Application Publication No. 2005-278289, the molten
insulating coating material may be solidified again or carbonized.
The molten insulating coating material remains near the neutral
point terminal (wire joint), and the coating material may be
peeled. As a result, the peeled pieces of the coating material
adversely affect the motor-driven compressor and may clog up the
compressor as foreign matters.
[0009] The object of the present invention is to improve the work
efficiency of assembling the motor-driven compressor and to avoid
adverse affect to the compressor by solidified molten pieces of the
insulating coating material, which are caused by heat of thermal
caulking.
SUMMARY OF THE INVENTION
[0010] This object is solved by the features of claim 1.
[0011] In accordance with the present invention, a motor-driven
compressor includes a shell. An electric motor, and a compression
portion driven by the electric motor and compressing refrigerant
are provided in the shell. A plurality of phase coils and a stator
are provided in the electric motor. A plurality of lead wires and a
plurality of phase wires drawn respectively from the plurality of
phase coils are provided in the stator. A cluster block has a phase
connector, and the lead wires are connected to the phase connector.
A drive control portion of the electric motor outside of the shell
is electrically connected to the phase connector through a
conductive retainer penetrating the shell. A phase wire bundle is
formed by binding the plurality of phase wires drawn respectively
from the plurality of phase coils. A wire joint is formed at the
tip portion of the phase wire bundle. Each phase wire is connected
electrically at the tip portion of the phase wire bundle is formed
by thermal caulking, and a neutral point is formed in the
compressor. A storage chamber which is formed in the cluster block
has an insertion opening on the outer periphery of the cluster
block. The wire joint is inserted from the insertion opening to the
storage chamber, and the insertion opening is closed by a closing
member.
[0012] The advantage is that the solidified coating material which
is melted once remains in the storage chamber since the wire joint
is inserted into the storage chamber and the insertion opening is
closed by the closing member. Therefore, the solidified coating
material does not adversely affect the compressor.
[0013] Another advantage is that it is easy to set the wire joint
into the storage chamber. Therefore, the work efficiency of
assembling the compressor is improved.
[0014] In accordance with the present invention, in the
motor-driven compressor, the closing member may be cylindrical and
has a cylindrical hole, through which the wire joint is
inserted.
[0015] The advantage is that the wire joint is arranged into the
storage chamber in the condition that the wire bundle runs through
the cylindrical hole.
[0016] In accordance with the present invention, in the
motor-driven compressor, the closing member may be formed by
connecting a first concave piece and a second concave piece.
[0017] The dividable structure of the cylindrical member makes it
easy to run the wire bundle through the cylindrical hole in
assembling.
[0018] In accordance with the present invention, in the
motor-driven compressor, the closing member may have a cut line
which extends to the cylindrical hole and the cut line may extend
from one end of the closing member to the other end. The closing
member may be developable from the cut line.
[0019] The developable structure of the closing member makes it
easy to run the wire bundle through the cylindrical hole in
assembling.
[0020] In accordance with the present invention, in the
motor-driven compressor, the closing member may have a tapering
outer periphery and a diameter of the tapering outer periphery
decreases in the insertion direction.
[0021] The structure in that the closing member has a tapering
outer periphery makes it easy to insert the cylindrical member
which has the wire bundle interiorly into the insertion
opening.
[0022] In accordance with the present invention, in the
motor-driven compressor, the closing member may be made of
rubber.
[0023] The rubber is a preferable material for closing the
insertion opening.
[0024] In accordance with the present invention, in the
motor-driven compressor, the storage chamber may be formed into a
dead end shape not penetrating the cluster block.
[0025] The structure of a dead end shape makes it easy to protect
the wire joint after assembling.
[0026] In accordance with the present invention, in the
motor-driven compressor, the storage chamber and the plurality of
phase connectors may be arranged in parallel.
[0027] The advantage is that the compressor is downsized.
[0028] In accordance with the present invention, in the
motor-driven compressor, the compression portion, the electric
motor, and the drive control portion may be arranged in line. The
plurality of phase wires are drawn from an end of the stator near
the compression portion.
[0029] The advantage is that the compressor is downsized.
[0030] Other aspects and advantages of the invention become
apparent from the following description, taken in conjunction with
the accompanying drawings, illustrating the principles of the
invention by way of example.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] The invention, together with the objects and advantages
thereof, may best be understood by reference to the following
description of the presently preferred embodiments together with
the accompanying drawings in which:
[0032] FIG. 1 is a longitudinal sectional view of a motor-driven
compressor according to a first embodiment of the present
invention;
[0033] FIG. 2 is an enlarged fragmentary sectional view taken along
the line A-A of FIG. 1;
[0034] FIG. 3A is an enlarged fragmentary horizontal sectional view
of FIG. 1;
[0035] FIG. 3B is a perspective view of a cylindrical member
39;
[0036] FIG. 3C is a perspective view of a first concave piece 43
and a second concave piece 44;
[0037] FIGS. 4A, 4B and 4C are explanations of thermal
caulking;
[0038] FIG. 5A is an enlarged fragmentary horizontal sectional view
of a motor-driven compressor according to a second embodiment of
the present invention;
[0039] FIG. 5B is a perspective view of a cylindrical member 39A of
the motor-driven compressor according to the second embodiment of
the present invention;
[0040] FIG. 5C is a perspective view of a first concave piece 43A
and a second concave piece 44A of the motor-driven compressor
according to the second embodiment of the present invention;
[0041] FIG. 6A is an enlarged fragmentary horizontal sectional view
of a motor-driven compressor according to a third embodiment of the
present invention; and
[0042] FIG. 6B is a perspective view of a cylindrical member 39B of
the motor-driven compressor according to the third embodiment of
the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0043] The following describes a motor-driven compressor according
to the first preferred embodiment of the present invention with
reference to FIGS. 1 through 4C.
[0044] Referring to FIG. 1, the scroll-type motor-driven compressor
designated by 10 has a generally cylindrical shell 11 in which an
electric machine or an electric motor M is received. The shell 11
includes a motor housing 12 and a front housing 13 connected to the
front end of the motor housing 12.
[0045] The electric motor M includes a rotary shaft 33, a rotor 14
fixed to the rotary shaft 33, and a stator 15 fixed on the inner
peripheral surface of the motor housing 12. The compressor 10 has a
movable scroll 16 and a fixed scroll 17 cooperating to form
therebetween compression chambers 18. The movable scroll 16 is
revolved by the rotation of the rotary shaft 33, so that the
volumes of the compression chambers 18 are varied while the
compression chambers 18 are moved from the periphery to the center
of the fixed scroll 17. The movable scroll 16 and the fixed scroll
17 are included in a compression portion P which introduces and
discharges refrigerant.
[0046] The motor housing 12 has an inlet port 121. The inlet port
121 is connected to an external refrigerant circuit 19. Refrigerant
(gas) is introduced from the external refrigerant circuit 19 into
the motor housing 12 through the inlet port 121. Refrigerant
introduced into the motor housing 12 flows into the compression
chamber 18 through a passage (not shown) between the inner
peripheral surface of the motor housing 12 and the outer peripheral
surface of the stator 15 and then through a suction port 20, with
the revolution of the movable scroll 16 (suction motion). By the
revolution of the movable scroll 16 (discharge motion), the
refrigerant in the compression chamber 18 is compressed and pushes
open a discharge valve 21 from the discharge port 171. Then, the
compressed refrigerant is discharged to a discharge chamber 22
formed in the front housing 13. The refrigerant flows out of the
discharge chamber 22 through an outlet port 131 of the front
housing 13 into the external refrigerant circuit 19, through which
the refrigerant flows back into the motor housing 12.
[0047] Referring to FIG. 2, the stator 15 of the electric motor M
includes a ring-shaped stator core 23, a U-phase coil 24U, a
V-phase coil 24V, and a W-phase coil 24W wound around the stator
core 23.
[0048] Referring to FIG. 1, a front side coil end 241 and a rear
side coil end 242 are shown. The front side coil end 241 is on a
front end face 231 of the stator core 23. The rear side coil end
242 is on the rear end face 232 of the stator core 23.
[0049] The rotor 14 of the electric motor M includes a rotor core
25 and a plurality of permanent magnets 26 embedded in the rotor
core 25. The rotor core 25 is formed therethrough with a central
hole 251 through which the rotary shaft 33 is inserted to fix
thereto.
[0050] A cover 27 is provided on the rear end surface of the motor
housing 12. An inverter 28 by which the electric motor M is driven
and controlled is accommodated in the cover 27. An end face of the
motor housing 12 that is covered with the cover 27 is formed
therethrough with a hole 29. A retainer 30 is fixed in the hole
29.
[0051] Referring to FIG. 3A, a plurality of conductive pins 31U,
31V, 31W are inserted through and fixed in the retainer 30 to form
a conductive member. External end faces of the conductive pins 31U,
31V, 31W on the exterior of the shell 11 (motor housing 12) are
electrically connected to the inverter 28 (see FIG. 1) through an
unshown wire.
[0052] Referring to FIG. 1, the motor-driven compressor comprises
the compression portion P, the electric motor M, and the inverter
28. The inverter 28 forms a drive control portion. The compression
portion P, the electric motor M, and the inverter 28 are arranged
in line in the axial direction of the rotary shaft 33.
[0053] Referring to FIG. 2, a cluster block 32 made of insulating
resin is fixed on the outer peripheral surface 230 of the stator
core 23. A concave portion 320 with a circular-arc shape in cross
section is formed in the cluster block 32. The cluster block 32 is
attached on the outer peripheral surface 230 of the stator core 23
by an unshown attaching means. In this situation, the concave
portion 320 is jointed with the convex outer peripheral surface 230
of the stator core 23.
[0054] Referring to FIG. 3A, a U-phase connector 321U, a V-phase
connector 321V, and a W-phase connector 321W are provided in
parallel in the cluster block 32. The conductive pins 31U, 31V, 31W
are connected in one-to-one relation to the connectors 321U, 321V,
321W.
[0055] Referring to FIG. 2, the lead wire 240U which leads to the
U-phase coil 24U is drawn from the front side coil end 241 of the
stator core 23 and is connected to the U-phase connector 321U. The
lead wire 240V which leads to the V-phase coil 24V is drawn from
the front side coil end 241 and is connected to the V-phase
connector 321V. The lead wire 240W which leads to the W-phase coil
24W is drawn from the front side coil end 241 and is connected to
the W-phase connector 321W. The lead wire of each phase coil 24U,
24V, 24W has a multiple-wire structure (doublet structure in this
embodiment) and each wire of a double wire is covered by enamel
resin. The number of lead wires is selected to avoid a high
voltage.
[0056] Referring to FIG. 3A, the lead wire 240U and the conductive
pin 31U are electrically connected through the U-phase connector
321U. The lead wire 240V and the conductive pin 31V are
electrically connected through the V-phase connector 321V. The lead
wire 240W and the conductive pin 31W are electrically connected
through the W-phase connector 321W.
[0057] Electric power is supplied from the inverter 28 shown in
FIG. 1 through the conductive pins 31U, 31V, 31W (with respect to
the conductive pins 31V, 31W, see FIG. 3A), the connectors 321U,
321V, 321W (see FIG. 2), and the lead wires 240U, 240V, 240W to the
coils 24U, 24V, 24W (see FIG. 2), so that the rotor 14 is rotated
together with the rotary shaft 33 in the inner peripheral side of
the stator core 23 (inside an inner peripheral surface 233 of the
stator core 23).
[0058] Referring to FIG. 2, the phase wire 35U drawn from the
U-phase coil 24U, the phase wire 35V drawn from the V-phase coil
24V, and the phase wire 35W drawn from the W-phase coil 24W are
bundled up and form the phase wire bundle 36. The plurality of
phase wires 35U, 35V, 35W are drawn from the front side coil end
241 which is at the side of the front end face 231 of the stator
core 23 near compression portion P (see FIG. 1).
[0059] Referring to FIG. 3A, the tip portions of the phase wires
35U, 35V, 35W which form the phase wire bundle 36 are connected
electrically by swaging a conductive ring 37 made of metal. By this
structure, the wire joint 361 is formed as neutral point wherein
each phase is connected electrically at the tip portion of the
phase wire bundle 36.
[0060] FIG. 4A shows the phase wire bundle 36 formed by binding the
phase wires 35U, 35V, 35W which are covered by insulating coating
made of enamel resin. FIG. 4B shows the condition in which the tip
portion of the phase wire bundle 36 runs through the conductive
ring 37. FIG. 4C shows the condition in which the conductive ring
37 is swaged by thermal chalking. By this structure, the insulating
coating at the phase wire bundle 36 which is fixed by the swaged
conductive ring 37 is melted and the phase wires 35U, 35V, 35W are
electrically connected to each other.
[0061] Referring to FIG. 3A, a storage chamber 38 is formed with a
bottom, or a dead end shape in parallel with the connectors 321U,
321V, 321W in the cluster block 32. The storage chamber 38 has an
insertion opening 381 which opens on the end face 322 of the
cluster block 32. The wire joint 361 is inserted in the insertion
opening 381 so as to be inserted in the storage chamber 38.
[0062] A cylindrical member 39, which is made of rubber, is
embedded in the insertion opening 381. The insertion opening 381 is
closed by the cylindrical member 39 to make no space between the
inner periphery of the insertion opening 381 and the phase wire
bundle 36. The cylindrical member 39 has a flange 40 which is
formed at the middle thereof in the insertion direction, a tapering
outer periphery 41, and a cylindrical surface 42 which is on the
opposite side of the tapering outer periphery 41 seen from the
flange 40. The diameter of the tapering outer periphery 41
decreases in the insertion direction R.
[0063] An annular groove 382 is formed in the inner periphery of
the storage chamber 38. The flange 40 is inserted in the annular
groove 382.
[0064] Referring to FIG. 3B, the cylindrical member 39, which is a
closing member, is formed by connecting a first concave piece 43
and a second concave piece 44 with semicircular cross-section
shape. The first and second concave pieces 43, 44 are of the same
shape and size. FIG. 3C shows a condition before jointing the first
and second concave pieces 43, 44.
[0065] Then, the following will explain the operation of the first
embodiment.
[0066] The first and second concave pieces 43, 44 are connected by
sandwiching the phase wire bundle 36 which is formed with the wire
joint 361 by thermally caulking the conductive ring 37, and are
configured in the cylindrical member 39. A cylindrical hole 391 is
formed by combining the first and second concave pieces 43, 44. The
wire joint 361 is inserted from the insertion opening 381 to the
storage chamber 38 in the condition that the wire joint 361 runs
through the cylindrical hole 391. Then the cylindrical member 39 is
inserted in the insertion opening 381.
[0067] The wire joint 361 which is inserted in the storage chamber
38 is installed as far as possible from the insertion opening 381
of the storage chamber 38. By inserting the wire joint 361 as far
as possible from the insertion opening 381 of the storage chamber
38, the phase wires 35U, 35V, 35W are stretched without bending.
The phase wires 35U, 35V, 35W is prevented from being shifted to
the inner peripheral side of the stator core 23. Since the phase
wires 35U, 35V, 35W are drawn from the front side coil end 241, the
lead wires 240U, 240V, 240W do not get into the inner peripheral
side of the stator core 23.
[0068] Additionally, the solidified coating material caused on the
wire joint 361 by thermal caulking does not go outside from the
storage chamber 38 since the wire joint 361 is inserted into the
storage chamber 38 and the insertion opening 381 is closed by the
cylindrical member 39.
[0069] The motor-driven compressor 10 according to the first
embodiment offers the following advantages.
(1) The solidified coating material which is melted once remains in
the storage chamber 38 since the wire joint 361 is inserted into
the storage chamber 38 and the insertion opening 381 is closed by
the cylindrical member 39. Therefore, the solidified pieces of
coating material do not adversely affect the compressor. (2) In the
condition that the wire joint 361 is retracted in the storage
chamber 38, the phase wire bundle 36 does not get into the interior
side of the stator core 23. The assembling of members which are to
be located in this space (for example, the support block 34 in this
embodiment) is not disturbed. (3) The wire joint 361 is fixed to
the cluster block 32 by inserting the wire joint 361 into the
storage chamber 38 and by closing the cylindrical member 39 at the
insertion opening 381. Inserting and closing are so easy that the
work efficiency of assembling the motor-driven compressor is
improved. (4) The cylindrical member 39 does not drop out of the
insertion opening 381 since the flange 40 is inserted in the
annular groove 382. Additionally, The wire joint 361 does not drop
out of the storage chamber 38 since the rubber cylindrical member
39 which is inserted in the insertion opening 381 is elastically
deformed and holds the phase wire bundle 36. (5) By the structure
in which the cylindrical member 39 has the tapering outer periphery
41, it is easy to insert the cylindrical member 39 having the phase
wire bundle 36 therein into the insertion opening 381. (6) The
divided structure of the cylindrical member 39 makes it easy to
insert the wire bundle 36 into the cylindrical hole 391 of the
cylindrical member 39. (7) It is easy to form the storage chamber
38 in the cluster block 32 made of insulating resin. By the
structure in that the wire joint 361 is inserted into the storage
chamber 38 and the cylindrical member 39 is inserted in the
insertion opening 381, it is easy to attach the phase wire bundle
36 to the cluster block 32. (8) It is possible that the enamel
resin, which coats at the tip of each single wire of the phase wire
bundle 36, is peeled in advance, and that the peeled tip is
connected by swaging the conductive ring 37. However, in the
structure in that the wire of each coil has double lines, the
number of single wires of the phase wire bundle 36 is increased (in
this embodiment, six wires). This makes it troublesome to work to
peel the enamel resin in advance and to form the wire joint
361.
[0070] In the thermal caulking, it is easy to form the wire joint
361, since it is not necessary to peel enamel resin in advance.
[0071] (9) In the motor-driven compressor 10, the compression
portion P, the electric motor M, and the inverter 28 are arranged
in line in this order. The plurality of the lead wires 240U, 240V,
240W are drawn from the side of front end face 231 of the stator
core 23 near the compression portion P. Therefore, it is not
necessary that the electric motor M and the inverter 28 are
electrically connected in between the narrow space of both parts
(in this embodiment, between the rear end face 232 and the rear
wall of the motor housing 12). In the motor-driven compressor 10 in
which the compression portion P, the electric motor M, and the
inverter 28 are arranged in line, it is easy to connect wires so
that the work efficiency of assembling the motor-driven compressor
is improved.
[0072] Therefore, the structure in which the phase wire bundle 36
is fixed in the cluster block 32 makes it particularly suitable for
an application to the motor-driven compressor 10 with an improved
working efficiency.
(10) The phase wire bundle 36 is surrounded by the cylindrical
member 39, which is made of rubber and is elastically deformed near
the insertion opening 381. Additionally, the cylindrical member 39,
which is elastically deformed and is made of rubber, is in close
contact with the inner periphery of the insertion opening 381.
Therefore, even if liquid refrigerant is present in the
motor-driven compressor 10, it prevents the wire joint 361 in the
storage chamber 38 from being soaked in the liquid refrigerant.
[0073] The following describes a second embodiment of the present
invention with reference to FIGS. 5A through 5C. The portions that
are like the first embodiment are denoted by the same reference
numerals and redundant explanations are omitted.
[0074] The cylindrical member 39A has the flange 40A which is
formed at one end and the cylindrical face 42. The flange 40A is
inserted into the annular groove 382 which is formed in an inner
periphery of the storage chamber 38. The cylindrical member 39A,
which is a closure member, is formed by connecting the first
concave piece 43A with semicircular cross-section shape and the
second concave piece 44A with semicircular cross-section shape. The
first concave piece 43A and the second concave piece 44A are of the
same shape and the same size. FIG. 5C shows the condition before
the first and second pieces 43A and 44A are connected.
[0075] The second embodiment offers the advantages from (1) to (5)
and from (7) to (10).
[0076] The following describes a third embodiment of the present
invention with reference to FIGS. 6A and 6B. The portions that are
like the first embodiment are denoted by the same reference
numerals and redundant explanations are omitted.
[0077] The cylindrical member 39B has the same shape as the
cylindrical member 39. The cylindrical member 39B has the
cylindrical hole 391, and has a cut line 45. The cut line 45
extends from the outer periphery of the cylindrical member 39B to
the cylindrical hole 391, and the cut line 45 also extends from one
end of the cylindrical member 39B to the other end in the axial
direction of the cylindrical hole 391. The cylindrical member 39B
is developable from the cut line 45. The phase wire bundle 36 is
introduced in the cylindrical hole 391 with spreading the
cylindrical member 39B.
[0078] The third embodiment offers the same effect as the first
embodiment.
[0079] The above embodiments may be modified as follows.
[0080] In the first and second embodiments, the first and second
concave pieces may be integrally formed into a cylindrical member.
In this case, the phase wire bundle 36 is laced into a cylindrical
hole of the cylindrical member before the wire joint 361 is formed
by swaging the conductive ring 37.
[0081] In the first and second embodiments, the insertion opening
381 may be closed by an adhesive.
[0082] A closure member may be made of synthetic resin. In this
case, the closure member may be attached to the cluster block 32 or
to the phase wire bundle 36 by melting the closure member made of
synthetic resin by ultrasonic wave adhesion, for instance.
[0083] A closure member may be formed by winding an insulating tape
to the phase wire bundle 36.
[0084] A storage chamber may be formed in the shape of a
penetrating hole. In this case, an opening which is different from
an insert opening may be closed by a plug.
[0085] The inverter 28 (drive control portion) may be arranged in
the radial direction instead of in the axial direction of the
electric motor M.
* * * * *