WO2014010320A1

WO2014010320A1 - Electric compressor and method for assembling electric compressor

Info

Publication number: WO2014010320A1
Application number: PCT/JP2013/064462
Authority: WO
Inventors: 尾崎　達也; 博匡島口; 津田　昌宏; 幸治廣野; 俊勝宮地; 一路岡野
Original assignee: カルソニックカンセイ株式会社
Priority date: 2012-07-13
Filing date: 2013-05-24
Publication date: 2014-01-16
Also published as: CN104395607B; US20150152870A1; EP2873859B1; CN104395607A; EP2873859A1; EP2873859A4

Abstract

An electric compressor (1, 101) and a method for assembly the same, the electric compressor comprising: an electric motor part (3, 104) including a stator (32, 113) fixed to a housing (2, 102) by being press-fitted into an inner peripheral wall (2d, 102d) of the housing (2, 102), and a rotor (33, 115) rotatably disposed on the inner side of the stator (32, 113); a compression part (4, 103) for compressing refrigerant, the compression part being driven by the rotational drive force of the electric motor part (3, 104); and a guide member (11, 119) having a guiding curved surface (15, 139) for guiding the press-fitting of the stator (32, 113) into the inner peripheral wall (2d, 102d) of the housing (2, 102), the guide member (11, 119) being attached to the outer periphery of the stator (32, 113).

Description

Electric compressor and method of assembling the electric compressor

The present invention relates to an electric compressor in which a compression unit compresses refrigerant by driving an electric motor unit.

A general electric compressor includes an electric motor portion and a compression portion in a cylindrical housing. In this electric compressor, the electric motor unit controls the compression unit, and the electric motor unit drives the compression unit so that the compression unit compresses the refrigerant. The housing is made of aluminum for weight reduction. The electric motor unit includes a stator in which a coil is wound around a stator core, and a rotor that is disposed inside the stator and that is rotated by a magnetic force generated when a current flows through the stator.

The stator is fixed to the inner peripheral wall of the housing, and is fixed to the cylindrical housing by shrink fitting as described in Patent Document 1. This is because the linear expansion coefficient is different between the stator and the housing, so that it is necessary to set a large allowance in consideration of a temperature rise during use of the electric compressor. In such shrink fitting, the stator is fixed to the housing by heating the housing, inserting and positioning the stator core inside the heated housing, and then cooling the heated housing to contract the housing. It is.

JP 2009-228546 A

As in Patent Document 1, when the stator is fixed to the housing by shrink fitting, it is necessary to heat the housing, which increases the number of processes and increases the cost. Further, in shrink fitting, it is necessary to adjust the temperature so that the temperature of the resin parts such as the insulating plate incorporated in the stator and the O-ring incorporated in the rotating body is equal to or lower than the heat resistance temperature, and the work is complicated. It becomes. Moreover, it is difficult to secure a sufficient tightening allowance.

In the present invention, the stator can be fixed to the housing without using the shrink-fitting process, and the press-fitting of the stator into the housing can be reliably performed in a state in which generation of burrs (shaving powder) is suppressed. It is an object of the present invention to provide an electric compressor and an electric compressor assembling method capable of ensuring a sufficient tightening allowance.

An electric compressor according to an embodiment includes a cylindrical housing and an electric motor unit fixed in the housing, and is fixed to the housing by press-fitting into an inner peripheral wall of the housing and generates a magnetic force by energization. An electric motor unit including a stator and a rotor that is rotatably arranged inside the stator and rotates by a magnetic force generated by the stator; and a rotational drive of the electric motor unit disposed in the housing A compression portion that is driven by force to compress the refrigerant, and a guide member that is attached to an outer periphery of the stator and includes a thin plate material having a guide curved surface portion that guides press-fitting of the stator into the inner peripheral wall of the housing. Is provided.

According to the above configuration, the guide member provided with the guide curved surface portion is attached to the outer periphery of the stator, and the stator is press-fitted into the housing in this attached state. For this reason, the corner | angular part of a stator does not contact | win the inner peripheral wall of a housing, and generation | occurrence | production of the burr | flash (shaving powder) which causes a failure can be prevented. Moreover, since it is possible to fix by press-fitting, a complicated shrink-fitting process can be eliminated. Furthermore, since the guide member is formed of a thin plate material, an increase in weight due to the attachment of the guide member can be reduced, and a high cost can be suppressed.

Further, the guide curved surface portion may be a curved surface that extends from an end portion on the insertion side of the stator to the inside of the housing toward the center side of the stator.

According to the above configuration, the guide curved surface portion is a curved surface that faces the center side of the stator. For this reason, guidance when the stator is press-fitted into the housing can be reliably performed.

In addition, the guide member has a slip prevention portion that extends from the guide curved surface portion and prevents the guide member from slipping in the axial direction when the stator is press-fitted into the inner peripheral wall of the housing. Also good.

According to the above configuration, the guide member deviation preventing portion is provided. For this reason, when the stator is press-fitted into the housing, the guide member is not displaced, and the stator can be reliably press-fitted.

In addition, the guide member is a fastening portion that is formed in an elongated shape along the axial direction of the stator and is press-fitted into the inner peripheral wall of the housing, and is an insertion side end of the fastening portion. There may be provided a fastening margin portion connected to the guide curved surface portion, and a latch holding portion that is provided at an end portion of the fastening margin portion opposite to the insertion side end portion and holds the stator. .

According to the above configuration, the guide member is formed by the fastening margin portion, the guide curved surface portion, and the locking holding portion, and the fastening margin portion sufficiently secures the fastening margin when the stator is press-fitted. The stop holding part secures the attachment state to the stator. For this reason, the press-fitting of the stator into the housing can be stabilized, and the guide member can be stably attached to the stator.

Further, a plurality of the guide members may be provided, and the guide members may be attached at equal intervals along the circumferential direction of the stator.

According to the above configuration, the guide members are attached at equal intervals in the circumferential direction of the stator. For this reason, it can prevent that a stator inclines and press-fits with respect to a housing.

The portion of the inner peripheral wall of the housing that faces the non-attached portion of the outer periphery of the stator where the guide member is not attached bulges toward the outer peripheral side of the housing, and the non-attached portion of the stator You may have a gap | interval between attachment parts.

According to the above configuration, a gap is formed between the non-attached portion of the guide member in the stator and the housing. For this reason, the non-attached portion of the guide member does not come into contact with the housing, and the shavings (burrs) of the housing due to the contact are not generated even in the non-attached portion of the guide member.

Further, the guide member may include a plurality of guide pieces having the guide curved surface portion and a connecting piece for connecting the guide pieces to each other at the guide curved surface portion.

According to the above configuration, the guide member includes a plurality of guide pieces each having a guide curved surface portion and a connecting piece that connects the guide pieces to each other, and the connecting piece connects the guide pieces at the guide curved surface portion. For this reason, the press-fitting of the stator into the housing can be reliably performed in a state in which the generation of burrs (shavings) is suppressed, and a sufficient fastening allowance can be ensured.

Further, the guide member may have a curved surface shape along the circumferential direction of the stator, and may have a slit formed in the axial direction of the guide member.

According to the above configuration, the guide member has a curved surface shape along the circumferential direction of the stator, and slits are formed in a slit shape in the axial direction of the guide member. For this reason, guidance when the stator is press-fitted into the housing can be reliably performed.

The assembly method of the electric compressor according to the embodiment includes a cylindrical housing and an electric motor unit fixed in the housing, which is fixed to the housing by press-fitting into the inner peripheral wall of the housing and is magnetically energized by energization. An electric motor unit including a stator that generates rotation and a rotor that is rotatably disposed inside the stator and that is rotated by the magnetic force generated by the stator, and rotation of the electric motor unit that is disposed in the housing An electric compressor assembly method including a compression unit that is activated by a driving force and compresses a refrigerant. In the method of assembling the electric compressor, a guide member made of a thin plate material is attached to at least three locations on the outer periphery of the stator, and the stator is attached to the inner peripheral wall of the housing by a guide curved surface portion of the attached guide member. It is provided to guide the press-fitting.

According to the above configuration, the guide member is attached to the outer periphery of the stator, and the press-fitting of the stator into the housing is guided by the guide curved surface portion of the guide member. For this reason, the stator can be smoothly press-fitted into the housing, and a complicated shrink-fitting process can be eliminated.

FIG. 1 is a partially broken perspective view showing an electric compressor according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state where the stator is press-fitted into the housing. FIG. 3 is a perspective view showing the stator. FIG. 4 is a perspective view showing the guide member. FIG. 5 is a cross-sectional view and a partially enlarged cross-sectional view showing an initial press-fitting state of the stator to the housing. FIG. 6 is a cross-sectional view showing a state where the stator is press-fitted into the housing. FIG. 7 is an enlarged cross-sectional view showing a state where the stator is press-fitted into the housing. FIG. 8 is a cross-sectional view showing a modification of the first embodiment and showing a state where six guide members are attached to the outer periphery of the stator and press-fitted into the housing. FIG. 9 is a cross-sectional view illustrating a modification of the guide member of the first embodiment. FIG. 10 is a cross-sectional view showing another modification of the guide member of the first embodiment. FIG. 11 is a partially broken perspective view showing an electric compressor according to a second embodiment of the present invention. FIG. 12 is a cross-sectional view showing a state where the stator is press-fitted into the housing. FIG. 13 is a perspective view showing the stator. FIG. 14 is a perspective view showing the guide member. FIG. 15 is a cross-sectional view and a partially enlarged cross-sectional view showing a state where the stator is press-fitted into the housing. FIG. 16 is a cross-sectional view illustrating a state where the press-fitting of the stator into the housing is completed. FIG. 17 is an enlarged cross-sectional view showing a state where the stator is press-fitted into the housing. FIG. 18 is a cross-sectional view showing a modification of the second embodiment and showing a state where six guide members are attached to the outer periphery of the stator and press-fitted into the housing. FIG. 19 is a cross-sectional view showing a modification of the guide member of the second embodiment. FIG. 20 is a cross-sectional view showing another modification of the guide member of the second embodiment. FIG. 21 is a side view of a guide member showing another modification of the second embodiment. FIG. 22A is a cross-sectional view taken along line AA of FIG. 21, showing a modification of the second embodiment and showing a state before the guide member is attached to the stator. FIG. 22B is a cross-sectional view taken along line AA of FIG. 21 showing a modification of the second embodiment and showing a state where the guide member is completely attached to the stator.

Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 10.

1 to 7 are views for explaining an electric compressor 1 according to a first embodiment of the present invention. FIG. 1 is a partially broken perspective view of the entire electric compressor 1. As shown in FIG. 1, the electric compressor 1 includes a housing 2, an electric motor unit 3, a compression unit 4, and a drive circuit unit 5.

The housing 2 includes a front housing 2a, a middle housing 2b, and a rear housing 2c, and is entirely formed of aluminum in a substantially cylindrical shape. These

housings

2a, 2b, and 2c are connected to each other by bolts so that the entire housing 2 is hollow, and the electric motor unit 3, the compression unit 4, and the drive circuit unit 5 are accommodated therein. .

The drive circuit unit 5 controls the number of revolutions of the electric motor unit 3 according to a change in the thermal load of the compression unit 4, and is accommodated in the front housing 2a. The electric motor unit 3 drives the compression unit 4 and is accommodated in the middle housing 2b and the rear housing 2c. The compression unit 4 is driven by the rotational driving force of the electric motor unit 3 to compress the refrigerant, and is accommodated in the rear housing 2c.

The compression unit 4 includes a cylinder block 42, a front side block 43 and a rear side block 44, and a rotor 45. In the cylinder block 42, a cylinder chamber 41 having an elliptical inner wall surface is formed. The front side block 43 and the rear side block 44 are held with the cylinder block 42 interposed therebetween. The rotor 45 is attached to the rotary drive shaft 31 extending from the electric motor unit 3 and is rotatably accommodated in the central portion of the cylinder chamber 41. The rotary drive shaft 31 extends left and right within the housing 2, and both end portions thereof are supported by the middle housing 2 b and the rear side block 44 so as to be rotatable within the housing 2.

A plurality of vane grooves 47 are formed on the outer periphery of the rotor 45 at equal intervals in the circumferential direction, and the vanes 46 are housed in the respective vane grooves 47 so as to be able to appear and retract. When the rotor 45 rotates, the vane 46 is subjected to centrifugal force and oil back pressure supplied to the bottom of the vane groove 47, and moves forward and backward with respect to the vane groove 47. Slide. The cylinder chamber 41 is divided into a plurality of compression chambers by the vanes 46. The volume of each compression chamber increases and decreases as the rotor 45 rotates and the vane 46 advances and retreats, and the refrigerant suction stroke, compression stroke, and discharge stroke are repeated as the volume increases and decreases. In the suction stroke, the refrigerant is sucked from the suction port, and in the discharge stroke, the refrigerant compressed in the compression step is discharged from the discharge port.

The electric motor unit 3 includes a stator 32 that is fixed to the housing 2 by being press-fitted into a rear housing 2c (hereinafter referred to as the housing 2), and a rotor 33 that is rotatably disposed inside the stator 32. Yes.

1 to 3, the stator 32 has a plurality of coils 35 wound around a stator core 34 having a cylindrical outer shape. The coil 35 is wound around the stator core 34 via a thin insulator 36 made of an insulating material, and a magnetic force is generated by energizing the coil 35 from the drive circuit unit 5.

The rotor 33 is attached to the rotation drive shaft 31. The rotor 33 is provided with a plurality of permanent magnets corresponding to the coils 35 of the stator 32 on the outer peripheral side, and rotates by receiving a magnetic force from the stator 32. The rotation drive shaft 31 is rotated by this rotation, and the rotor 45 of the compression unit 4 is rotated by the rotation of the rotation drive shaft 31.

The stator core 34 of the stator 32 is formed by a laminated steel plate in which thin ring-shaped steel plates are laminated. The stator 32 is fixed to the housing 2 by press-fitting the stator core 34 into the inner peripheral wall 2d of the housing 2 made of aluminum. The guide member 11 is attached to the stator 32 with respect to the press-fitting of the stator 32 into the inner peripheral wall 2d of the housing 2.

2 and 3, the guide member 11 is attached to a plurality of locations (three locations in the present embodiment) at equal intervals in the circumferential direction with respect to the outer periphery of the stator 32 (stator core 34). The guide member 11 performs guidance when the stator 32 is press-fitted into the housing 2.

As shown in FIG. 4, the guide member 11 includes a plurality of (four) guide pieces 12 extending along the press-fitting direction (the vertical direction in FIG. 4), and a connecting piece 13 provided integrally with the guide piece 12. And is formed by. The connecting pieces 13 are provided at a plurality of locations (two locations) along the length direction of the guide pieces 12, and connect the adjacent guide pieces 12 at a plurality of locations in the length direction. By connecting the plurality of guide pieces 12 with the connecting pieces 13 in this way, the entire guide member 11 is shaped like a raft. Since such a guide member 11 can be formed in an arc shape along the outer peripheral wall of the arc-shaped stator 32, the guide member 11 can be attached along the outer surface of the stator 32.

The guide member 11 is created by pressing a thin steel plate. Thereby, the weight increase at the time of providing the guide member 11 can be reduced, and a cost increase can be suppressed.

As shown in FIGS. 4 to 7, the guide piece 12 of the guide member 11 is formed to have substantially the same length as the axial length of the stator 32 (stator core 34) made of laminated steel plates. Each guide piece 12 has a fastening margin 14 formed in an elongated shape along the axial direction of the stator 32, and an insertion side end of the fastening margin 14 (lower side in FIGS. 4 to 7). The guide curved surface portion 15 extending from the lower end portion) and the latch holding provided at the end portion (the upper end portion located on the upper side in FIGS. 4 to 7) of the tightening margin portion 14 opposite to the guide curved surface portion 15 Part 16.

The fastening margin 14 has a flat plate shape and is press-fitted into the inner peripheral wall 2 d of the housing 2 when the stator 32 is press-fitted into the housing 2. Accordingly, the stator 32 can be pressed into the inner peripheral wall 2 d of the housing 2 without the outer peripheral wall of the stator 32 contacting the inner peripheral wall 2 d of the housing 2.

The guide curved surface portion 15 is formed by a curved surface that is curved and extended from the lower end portion of the tightening margin portion 14 toward the center side of the stator 32. A tapered portion 17 is formed on the curved surface portion of the guide curved surface portion 15. The tapered portion 17 is linearly inclined from the inner peripheral wall 2 d of the housing 2 toward the axial direction of the stator 32, and acts to perform guidance when the stator 32 is press-fitted into the housing 2. By providing such a guide curved surface portion 15, the corner portion of the stator 32 does not directly contact the inner peripheral wall 2 d of the housing 2 when the stator 32 is press-fitted into the inner peripheral wall 2 d of the housing 2. For this reason, no shavings are generated from the housing 2. Thereby, the failure resulting from the generation of shavings can be prevented.

The extended end portion of the guide curved surface portion 15 serves as a shift prevention portion 18 that is in contact with and locked to the insertion side end portion (lower end portion) of the stator 32. The deviation preventing portion 18 abuts against the insertion side end portion of the stator 32, thereby preventing the guide member 11 from being displaced in the axial direction when press-fitting into the inner peripheral wall 2d of the housing 2.

The locking holding portion 16 is integrally formed with the fastening margin portion 14 so as to go toward the center side of the stator 32 at the end opposite to the guide curved surface portion 15. The locking holding portion 16 is curved in a U shape from the end portion of the tightening margin portion 14, thereby imparting a spring property, and an end portion (on the opposite side of the insertion side end portion of the stator 32 by the spring force) ( (Upper end). Thereby, the guide member 11 is not detached from the stator 32, and the guide member 11 can be attached to the stator 32.

As shown in FIG. 2, the inner peripheral wall 2 d of the housing 2 that faces the outer peripheral portion (non-attached portion) of the stator 32 to which the guide member 11 is not attached bulges toward the outer peripheral side (outside) of the housing 2. Is formed. Thus, by forming the bulging portion 2f bulging outward on the inner peripheral wall 2d of the housing 2 corresponding to the non-attached portion of the guide member 11, the bulging portion 2f has the inner peripheral wall 2d of the housing 2 and the stator 32. A gap can be formed between the two. For this reason, the non-attached portion of the guide member 11 in the stator 32 does not come into contact with the inner peripheral wall 2d of the housing 2, and shavings of the housing 2 due to the contact may be generated also in the non-attached portion of the guide member 11. Absent.

5 and 6 show an operation of press-fitting the stator 32 into the inner peripheral wall 2d of the housing 2. FIG.

Prior to press-fitting, the guide member 11 is attached to the outer periphery of the stator 32 at three equal intervals. By attaching the guide member 11 to at least three places, the stator 32 can be press-fitted without tilting. The guide member 11 is attached by locking the locking holding portion 16 to the upper end portion of the stator 32. In this attached state, as shown in FIG. 5, the guide curved surface portion 15 of the guide member 11 extends from the insertion side end portion of the stator 32 toward the center side, thereby covering the insertion side end portion.

The stator 32 is press-fitted into the inner peripheral wall 2d of the housing 2 with the guide member 11 attached. When press-fitting, since the tapered portion 17 formed on the guide curved surface portion 15 guides the press-fitting along the inner peripheral wall 2d of the housing 2, the press-fitting can be smoothly performed. Further, since the guide curved surface portion 15 prevents the corner portion of the stator 32 from directly contacting the inner peripheral wall 2d of the housing 2, it is possible to prevent generation of shaving powder from the housing 2. At the time of this press-fitting, the shift prevention unit 18 prevents the guide member 11 from shifting in the axial direction, so that the guide member 11 does not shift from the stator 32.

Further, as shown in FIG. 5, a boss portion for increasing the strength of the guide curved surface portion 15 is formed on the outer peripheral surface side of the guide curved surface portion 15, and a portion protruding to the inner peripheral surface side of the guide curved surface portion 15 is formed. Is formed. The protruding portion is engaged with the lower end portion of the stator 32 to form a displacement prevention portion 18a that prevents the guide member 11 from being displaced from the stator 32.

FIG. 7 shows the press-fit completion state of the stator 32. A tapered step portion 2e is formed on the inner peripheral wall 2d of the housing 2, and the guide curved surface portion 15 of the guide member 11 contacts the step portion 2e. Due to this contact, the press-fitting of the stator 32 is stopped, and the stator 32 is fixed at a predetermined position on the inner peripheral wall 2 d of the housing 2. In this fixed state, the long fastening margin 14 of the guide member 11 is press-fitted into the inner peripheral wall 2d of the housing 2, so that a sufficient fastening margin can be secured and the stator 32 is stably fixed to the housing 2. be able to.

In such an embodiment, the guide member 11 is attached to three locations on the outer periphery of the stator 32 and the stator 32 is press-fitted into the inner peripheral wall 2d of the housing 2, so that the corners of the stator 32 are the inner peripheral wall 2d of the housing 2. Therefore, it is possible to prevent generation of shavings that cause failure. Moreover, since it is possible to fix by press-fitting, a complicated shrink-fitting process can be eliminated.

In the present embodiment, the guide member 11 is shaped like a frame in which a plurality of guide pieces 12 are desired to be connected by the connecting pieces 13, but the present invention is not limited to this. For example, the guide piece 12 alone may be used as the guide member 11, or the guide member 11 may have a curved plate shape that is curved along the outer periphery of the stator 32.

FIG. 8 shows a modification in which the raft-shaped guide member 11 shown in FIG. 4 is attached to the outer periphery of the stator 32 at six locations. Six guide members 11 are attached to the outer periphery of the stator 32 at equal intervals. In this case, the stator 32 can be press-fitted in a state in which the inclination of the stator 32 with respect to the housing 2 is further reliably prevented.

9 and 10 show modifications of the guide member 11 of the first embodiment, respectively.

In the guide member 11 of FIG. 9, the guide curved surface portion 15 is folded back in an arc shape, and a shift prevention portion 18 is formed integrally with the folded end portion. The slip prevention part 18 extends in a planar shape from the folded end part of the guide curved surface part 15 toward the center of the stator 32. Since such a planar displacement prevention portion 18 contacts the insertion side end portion of the stator 32 with a large area, it is possible to more reliably prevent the displacement of the guide member 11 in the axial direction during press-fitting. it can.

In the guide member 11 of FIG. 9, the latch holding portion 16 is not formed at the end portion of the tightening margin portion 14 opposite to the guide curved surface portion 15. Even in this case, when the stator 32 is press-fitted into the inner peripheral wall 2d of the housing 2, the guide member 11 can reliably guide the stator 32.

In the guide member 11 shown in FIG. 10, the shift preventing portion 18 is connected to the end portion of the guide curved surface portion 15 in an oblique manner. The shift prevention unit 18 prevents the guide member 11 from shifting in the axial direction when the corner 32 abuts against the insertion side end (lower end) of the stator 32 and the stator 32 is press-fitted. Further, when the pressure input is applied, the displacement prevention unit 18 can be deformed by being pushed toward the center side of the stator 32. Thereby, the shift | offset | difference of the guide member 11 can be prevented reliably.

As shown in FIG. 10, a boss portion for increasing the strength of the guide curved surface portion 15 is formed on the outer peripheral surface side of the guide curved surface portion 15, and a portion protruding to the inner peripheral surface side of the guide curved surface portion 15 is formed. Has been. The protruding portion is engaged with the lower end portion of the stator 32 to form a displacement prevention portion 18a that prevents the guide member 11 from being displaced from the stator 32.

In the guide member 11 of FIG. 10 as well, the latch holding portion 16 is not formed at the end portion of the tightening margin portion 14 opposite to the guide curved surface portion 15. The guide member 11 can reliably perform the guide when the inner peripheral wall 2d is press-fitted.

Moreover, although the example which provided the guide member 11 in 3 places and 6 places of the outer periphery of the stator 32 was shown in the said embodiment, the guide member 11 may be formed over the perimeter of the stator 32. FIG. .

Next, a second embodiment of the present invention will be described in detail with reference to FIGS. 11 to 22B.

As shown in FIG. 11, the electric compressor 101 according to the second embodiment includes a substantially cylindrical housing 102, a compression unit 103 that is accommodated in the housing 102 and compresses refrigerant, and is adjacent to the compression unit 103. An electric motor unit 104 housed in the housing 102 and a drive circuit unit 105 that controls driving of the electric motor unit 104 are provided.

The housing 102 includes a front housing 102a, a middle housing 102b, and a rear housing 102c. As shown in FIG. 11, the front housing 102a is connected to the middle housing 102b, and the middle housing 102b is connected to the rear housing 102c to form a substantially cylindrical housing 102. The compression portion 103 and the electric motor are formed in the housing 102. The unit 104 and the drive circuit unit 105 are accommodated.

The front housing 102a accommodates a drive circuit unit 105 that controls the drive of the compression unit 103. The middle housing 102b and the rear housing 102c accommodate the electric motor unit 104 and the compression unit 103. A bulging portion 102f is formed on the inner peripheral wall 102d of the rear housing 102c so as to protrude from the inner peripheral wall 102d.

The compression unit 103 includes a cylinder block 107 having a cylinder chamber 121 on the inner periphery, a pair of side blocks 109 disposed at both ends of the cylinder block 107, and a rotor 111 disposed rotatably in the cylinder chamber 121. ing.

The cylinder block 107 is formed in an O shape. A cylinder chamber 121 is formed on the inner periphery of the cylinder block 107 by sandwiching both ends of the cylinder block 107 by a front side block 109 a and a rear side block 109 b which are a pair of side blocks 109.

In the cylinder chamber 121, a cylindrical rotor 111 is rotatably arranged. A vane 123 protrudes from a vane groove 125 formed in the rotor 111, and the refrigerant is compressed by the inner wall of the cylinder chamber 121 and the tip of the vane 123. A plurality of vane grooves 125 formed on the outer periphery of the rotor 111 are formed at equal intervals in the circumferential direction, and a plate-like vane 123 is accommodated in the vane groove 125 so as to be able to appear and retract.

The rotor 111 is press-fitted and fixed to a drive shaft 117 of an electric motor unit 104 to be described later, and the rotor 111 is also rotatable by the rotation of the drive shaft 117.

The electric motor unit 104 includes a stator 113, a rotor 115, a drive shaft 117, and a guide member 119. The stator 113 is press-fitted into the inner peripheral wall 102d of the rear housing 102c. The rotor 115 is rotatably arranged on the inner periphery of the stator 113. The drive shaft 117 is press-fitted and fixed to the rotor 115. The guide member 119 guides the press-fitting of the stator 113 into the rear housing 102c.

The stator 113 includes a stator core 127 formed of laminated steel plates, an insulator 131 formed of an insulating material and disposed on the stator core 127, and a coil 129 wound around the stator core 127 via the insulator 131. .

The rotor 115 is formed in a cylindrical shape. The rotor 115 is rotated by the magnetic force generated by the current flowing through the stator 113. A drive shaft 117 is press-fitted and fixed at the center of the rotor 115, and the rotor 115 transmits a rotational driving force to the drive shaft 117.

The drive shaft 117 has one end side rotatably supported by the middle housing 102 b and the other end side supported by a pair of side blocks 109 of the compression unit 103. The rotor 111 is press-fitted and fixed near the other end of the drive shaft 117, and the rotational driving force transmitted from the electric motor unit 104 is transmitted to the rotor 111 via the drive shaft 117.

As shown in FIGS. 12 and 13, the guide members 119 are arranged such that three guide members 119 are arranged at equal intervals in the circumferential direction on the outer periphery of the stator 113.

The guide member 119 is formed of a thin plate material. As shown in FIG. 14, the guide member 119 includes a plurality of guide pieces 133 extending in the press-fitting direction and a connecting piece 135 connecting the plurality of guide pieces 133, and the guide member 119 is formed in a raft shape. Since the guide member 119 is formed in a raft shape, it can be formed in a curved shape along the outer periphery of the stator 113 and can be attached along the outer periphery of the stator 113.

The guide piece 133 having a curved shape along the outer periphery of the stator 113 includes a tightening margin portion 137, a guide curved surface portion 139, and a locking holding portion 141. The tightening margin 137 abuts on a bulging portion 102f formed on the inner peripheral wall 102d of the rear housing 102c. The guide curved surface portion 139 is formed at an end portion (lower end portion) on one end side of the guide piece 133 and guides the press-fitting of the stator 113 into the housing 102. The locking holding portion 141 is formed at an end portion (upper end portion) on the other end side of the guide piece 133 on the opposite side to the guide curved surface portion 139.

The fastening allowance portion 137 is press-fitted into the inner peripheral wall 102d of the rear housing 102c when the stator 113 is press-fitted into the bulging portion 102f of the rear housing 102c. That is, the stator 113 can be pressed into the bulging portion 102f of the rear housing 102c without the outer periphery of the stator 113 coming into contact with the inner peripheral wall 102d of the rear housing 102c.

A slit portion 140 is formed adjacent to the fastening margin portion 137. By providing the slit portion 140, it is possible to reduce resistance due to friction when the stator 113 is press-fitted into the rear housing 102c, to facilitate press-fitting, and to reduce the weight of the guide member 119, Weight reduction can be achieved.

The guide curved surface portion 139 is a displacement that abuts and locks the tapered portion 142 that guides the press-fitting of the stator 113 into the rear housing 102c and the end portion (lower end) in the press-fit direction of the stator 113 into the rear housing 102c. And a prevention unit 143.

The tapered portion 142 is formed continuously with the fastening margin portion 137, is inclined linearly from the inner peripheral wall 102d of the housing 102 toward the axial direction of the stator 113, and is used when the stator 113 is press-fitted into the rear housing 102c. Acts as a guide.

The taper portion 142 on the tightening margin 137 side is connected to guide pieces 133 together with a connecting piece 135 described later.

The misalignment preventing portion 143 formed continuously with the tapered portion 142 is formed to be bent so as to come into contact with the stator 113 from the tapered portion 137 side and the tapered portion 142 on the other end side. The slip prevention portion 143 contacts the front end portion of the stator 113 in the press-fitting direction, thereby preventing the guide member 119 from shifting in the axial direction when the stator 113 is press-fitted into the inner peripheral wall 102d of the rear housing 102c.

A protruding portion 143a protruding from the inner peripheral surface is formed on the inner peripheral surface side of the guide curved surface portion 139 where the guide curved surface portion 139 and the stator 113 abut. The protruding portion 143a prevents the guide member 119 and the stator 113 from being displaced due to contact of the front end portion of the stator 113 in the press-fitting direction. On the outer peripheral surface side of the guide curved surface portion 139, a boss portion for ensuring the strength of the guide curved surface portion 139 is formed.

The locking holding portion 141 is formed continuously with the fastening allowance portion 137 and is formed so as to be directed toward the center of the stator 113 at the end portion on the other end side of the guide curved surface portion 139. The latch holding portion 141 has a spring property because it is curved in a U shape from the end of the fastening allowance portion 137, and this spring force causes the stator 113 on the rear end side in the press-fitting direction of the stator 113 to move. keeping.

As described above, the guide member 119 supports the front end side in the press-fitting direction and the rear end side in the press-fitting direction of the stator 113 by the deviation preventing portion 143 and the locking holding portion 141 of the guide curved surface portion 139.

The connecting piece 135 that connects the guide pieces 133 connects the adjacent guide pieces 133 in a raft shape. The position where the connecting piece 135 is provided can be in the vicinity of the end of the guide piece 133.

The connecting piece 135 provided in the vicinity of the distal end side of the guide piece 133 in the press-fitting direction connects the guide pieces 133 to each other at the tightening margin portion 137 with which the inner peripheral wall 102d of the housing 102 abuts and the tapered portion 142 of the guide curved surface portion 139. ing. The connecting piece 135 provided in the vicinity of the rear end side of the guide piece 133 in the press-fitting direction connects the guide pieces 133 at the tightening margin 137.

The end of the connecting piece 135 on the tip side in the press-fitting direction is also inclined linearly from the inner peripheral wall 102d of the housing 102 toward the axial direction of the stator 113, like the tapered portion 142.

In addition, although the connection piece 135 of this embodiment has connected the guide piece 133 in two places as shown in FIG. 14, you may provide the connection piece 135 of two or more places. Also in this case, at least one connecting piece 135 connects the guide piece 133 at the guide curved surface portion 139.

The drive circuit unit 105 is accommodated in the front housing 102a. In the drive circuit unit 105, the rotation speed of the electric motor unit 104 is controlled according to the heat load of the compression unit 103.

Next, the operation of press-fitting the stator 113 into the housing 102 will be described.

First, as shown in FIGS. 12 and 13, three guide members 119 are attached to the outer periphery of the stator 113 at equal intervals in the circumferential direction. When the guide member 119 is attached, the displacement preventing portion 143 and the protruding portion 143a formed on the guide curved surface portion 139 are brought into contact with the front end portion in the press-fitting direction of the stator 113, and then the spring property of the locking holding portion 141 is increased. The locking holding portion 141 is attached to the rear end portion in the press-fitting direction of the stator 113 by using it.

After the guide member 119 is attached to the stator 113, the guide curved surface portion 139 of the guide member 119 is press-fitted from the opening of the housing 102 as shown in FIG.

When the stator 113 is press-fitted into the housing 102, it is press-fitted so as to come into sliding contact with the bulging portion 102f formed on the inner peripheral wall 102d of the rear housing 102c from the guide curved surface portion 139 of the guide member 119. Thereby, since the taper part 142 of the guide curved surface part 139 guides the press-fitting, the stator 113 can be easily press-fitted into the housing 102.

Further, since the guide curved surface portion 139 is press-fitted into the bulging portion 102 f formed on the inner peripheral wall 102 d of the housing 102, it is possible to prevent the front end portion in the press-fitting direction of the stator 113 from coming into contact with the opening portion of the housing 102. it can. For this reason, generation | occurrence | production of the shavings (burr) from the inner peripheral wall 102d of the housing 102 can be prevented.

As described above, when the guide curved surface portion 139 is press-fitted into the bulging portion 102f formed on the inner peripheral wall 102d of the housing 102 in the press-fitting direction, the tightening allowance portion 137 is press-fitted into the bulging portion 102f. As shown in FIGS. 16 and 17, the press-fitting completion state is achieved.

In the electric compressor 101 of the present embodiment, a guide member 119 having a guide curved surface portion 139 that guides press-fitting of the stator 113 into the housing 102 is disposed on the outer periphery of the stator 113. For this reason, the stator 113 can be fixed to the housing 102 without using the shrink fitting process.

The guide member 119 includes a plurality of guide pieces 133 each having a guide curved surface portion 139, and a connecting piece 135 that connects the guide pieces 133 to each other. The connecting piece 135 connects the guide pieces 133 at the guide curved surface portion 139. As a result, when the stator 113 is press-fitted into the housing 102, it can be reliably performed in a state in which the generation of burrs (shaving powder) is suppressed, and a sufficient fastening allowance can be ensured. Further, the connecting piece 135 is connected by the guide piece 133 at the guide curved surface portion 139. For this reason, the cross-sectional area of the guide curved surface portion 139 can be increased, and the strength of the guide member 119 can be improved.

The guide member 119 has a curved surface shape along the outer periphery of the stator 113, and a slit-like cut (slit portion 140) is formed in the axial direction of the guide member 119. Thereby, guidance when the stator 113 is press-fitted into the housing 102 can be reliably performed.

The guide member 119 is formed of a thin plate material. For this reason, an increase in weight due to the attachment of the guide member 119 can be prevented, and an increase in cost can be suppressed.

The guide members 119 are attached at equal intervals in the circumferential direction of the stator 113. For this reason, it is possible to prevent the stator 113 from being inclined and pressed into the housing 102.

A gap is formed between the non-attached portion of the guide member 119 in the stator 113 and the housing 102. For this reason, since the non-attached portion of the guide member 119 does not come into contact with the housing 102, the occurrence of shavings (burrs) generated by the stator 113 coming into contact with the housing 102 is prevented even in the non-attached portion of the guide member 119. be able to.

Next, a modification of the second embodiment will be described with reference to FIGS. 18 to 22B.

FIG. 18 shows a modified example in which the raft-shaped guide member 119 shown in FIG. 14 is attached to the outer periphery of the stator 113.

Also in this modification, the six guide members 119 attached to the outer periphery of the stator 113 are attached at equal intervals in the circumferential direction.

In this modified example, the stator 113 is press-fitted in a state in which the inclination of the stator 113 with respect to the housing 102 is prevented more reliably than in the case where the three guide members 119 are attached to the outer periphery of the stator 113 described above. Can do.

19 and 20 show modifications of the guide member 119 of the second embodiment.

In the guide member 119 shown in FIG. 19, the guide curved surface portion 139 is bent into a U shape, and the inner peripheral surface side of the guide curved surface portion 139 is directed toward the center of the stator 113 along the press-fitting direction front end portion of the stator 113. As described above, the shift prevention portion 143 is extended in a planar shape.

Also in the guide member 119, the vicinity of the end of the guide curved surface portion 139 formed on the guide piece 133 is connected by the connecting piece 135, as in the second embodiment described above.

Since such a planar displacement preventing portion 143 contacts the tip end portion of the stator 113 in the press-fitting direction with a large area, the guide member 119 can be more reliably prevented from being displaced in the press-fitting direction during press-fitting. it can.

20 has a protrusion 143a formed on the inner peripheral surface of the guide member 119, and this protrusion 143a is formed along the outer peripheral end of the stator 113 in the press-fitting direction. ing. Also in the guide member 119 shown in FIG. 20, a boss portion is formed on the outer peripheral surface of the guide member 119.

Also in this guide member 119, the vicinity of the end of the guide curved surface portion 139 formed on the guide piece 133 is connected by the connecting piece 135, as in the second embodiment and the modification described above.

Thus, since the protruding portion 143a is provided along the outer peripheral end of the stator 113, the protruding portion 143a contacts the front end portion in the press-fitting direction of the stator 113 in addition to the misalignment preventing portion 143. For this reason, the displacement of the guide member 119 in the press-fitting direction at the time of press-fitting can be further reliably prevented.

Further, in the guide member 119 shown in FIGS. 19 and 20, the locking holding portion 141 is not formed at the end portion on the other end side of the guide curved surface portion 139. Even in this case, when the stator 113 is press-fitted into the inner peripheral wall 102d of the housing 102, the guide member 119 can reliably guide.

In the guide member 119 shown in FIGS. 21, 22 </ b> A, and B, the projecting portion forming hole 144 is provided in the tightening allowance portion 137. In addition, description is abbreviate | omitted about the same structure as 2nd Embodiment mentioned above and a modification.

The protruding portion forming hole 144 is formed by shearing a thin plate material that forms the guide member 119. The projecting portion 143a is inclined in the direction approaching the misalignment preventing portion 143 by pressing a portion sheared to form the projecting portion forming hole 144 with a tool or the like (not shown).

22A is a cross-sectional view of the guide member 119 showing a state before the guide member 119 is attached to the stator 113. FIG. FIG. 22B is a cross-sectional view of the guide member 119 showing a state where the guide member 119 is completely attached to the outer periphery of the stator 113.

In this modification, when the guide member 119 is attached to the stator 113, the stator 113 is brought into contact with the deviation preventing portion 143 formed on the guide curved surface portion 139. Then, by further pressing in the press-fitting direction of the stator 113 from the state in which the displacement prevention portion 143 and the stator 113 are in contact, the displacement prevention portion 143 is separated from the protruding portion 143a from the state of the guide member 119 shown in FIG. 22A. The guide member 119 shown in FIG. 22B is completely attached. At this time, the protrusions 143a and the tips of the displacement prevention parts 143 are in contact with the stator 113 to support the tips of the stator 113 in the press-fitting direction.

In this manner, the protruding portion forming hole 144 is provided in the tightening allowance portion 137 of the guide member 119, and the portion sheared to form the protruding portion forming hole 144 is inclined in the direction approaching the misalignment preventing portion 143 to protrude the protruding portion 143a. Is forming. For this reason, since the protrusion part 143a can be formed only by punching a thin plate material and pressing the protrusion part formation hole 144, the protrusion part 143a can be formed easily.

Furthermore, similarly to the above-described modification, the protruding portion 143a and the deviation preventing portion 143 are in contact with the stator 113. For this reason, the shift | offset | difference to the press injection direction of the stator 113 can be prevented.

In the present embodiment and the modification, the guide members 119 are arranged evenly at three locations on the outer periphery of the stator 113 or evenly at six locations as shown in FIG. It may be other than six places. That is, when the stator 113 is press-fitted into the housing 102, any number of guide members 119 may be provided as long as the stator 113 can be inserted without tilting.

Furthermore, it may be a C-shape that provides only one guide member 119 and covers the outer periphery of the stator 113.

21, 22 </ b> A, and 22 </ b> B, the projecting portion forming hole 144 is provided in the tightening allowance portion 137, but the projecting portion forming hole 144 is provided in the tapered portion 142 so that the projecting portion 143 a is prevented from being displaced. You may make it incline in the direction close | similar to 143.

As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is determined only by the invention specifying matters according to the scope of claims reasonable from the above description.

The entire contents of Japanese Patent Application No. 2012-157415 (application date: July 13, 2012) and Japanese Patent Application No. 2013-025180 (application date: February 13, 2013) are incorporated herein by reference.

Claims

A cylindrical housing;
An electric motor portion fixed in the housing, the stator being fixed to the housing by press-fitting into the inner peripheral wall of the housing and generating a magnetic force by energization, and rotatably disposed inside the stator. An electric motor unit including a rotor that rotates due to the magnetic force generated by the stator;
A compression unit disposed in the housing and driven by the rotational driving force of the electric motor unit to compress the refrigerant;
A guide member made of a thin plate material attached to the outer periphery of the stator and having a guide curved surface portion for guiding the press-fitting of the stator into the inner peripheral wall of the housing;
Electric compressor with
2. The electric compressor according to claim 1, wherein the guide curved surface portion is a curved surface that extends from an end portion of the stator that is inserted into the housing toward the center of the stator.
The said guide member is extended from the said guide curved surface part, and has the slip prevention part which prevents the shift | offset | difference to the axial direction of the said guide member at the time of the press injection of the said stator to the said internal peripheral wall of the said housing. The electric compressor according to claim 2.
The guide member is
A tightening margin that is formed in an elongated shape along the axial direction of the stator and is press-fitted into the inner peripheral wall of the housing, and is connected to the guide curved surface portion at an insertion side end of the tightening margin The closing part,
4. The locking holding portion that is provided at an end portion of the tightening margin portion that is opposite to the insertion-side end portion and holds the stator. 5. Electric compressor.
A plurality of the guide members are provided,
The electric compressor according to any one of claims 1 to 4, wherein the guide members are attached at equal intervals along a circumferential direction of the stator.
The portion of the inner peripheral wall of the housing that faces the non-attached portion of the outer periphery of the stator where the guide member is not attached bulges toward the outer peripheral side of the housing, and the non-attached portion of the stator The electric compressor according to any one of claims 1 to 5, wherein a gap is provided therebetween.
The guide member is
A plurality of guide pieces having the guide curved surface portion;
The electric compressor according to claim 1, comprising: a connecting piece that connects the guide pieces to each other at the guide curved surface portion.
The electric compressor according to claim 7, wherein the guide member has a curved surface shape along a circumferential direction of the stator and has a slit formed in an axial direction of the guide member.
A cylindrical housing, an electric motor unit fixed in the housing, fixed to the housing by press-fitting into the inner peripheral wall of the housing, and rotating inside the stator. An electric motor unit including a rotor that is freely arranged and rotates by a magnetic force generated by the stator, and a compression unit that is arranged in the housing and is activated by a rotational driving force of the electric motor unit to compress refrigerant. An electric compressor assembly method comprising:
A guide member made of a thin plate material is attached to at least three locations on the outer periphery of the stator,
A method for assembling an electric compressor that guides press-fitting of the stator into the inner peripheral wall of the housing by a guide curved surface portion of the attached guide member.