Electric Compressor

Abstract

Provided is an electric compressor capable of suppressing axial vibration of a rotating shaft during operation, suppressing an increase in noise, and preventing damage to a bearing supporting the rotating shaft. [Solution] The present invention provides an electric compressor comprising a housing, a compression mechanism disposed within the housing for compressing a refrigerant, a motor for generating the power required for the compression mechanism, a rotating shaft for transmitting the power from the motor to the compression mechanism, a bearing for supporting the rotating shaft, and an elastic member for pressing the rotating shaft towards the compression mechanism.

Description

[Technical field]

[0001] The present invention relates to an electric compressor, and more particularly to an electric compressor capable of compressing a refrigerant by the driving force of a motor. [Background technology]

[0002] Generally, a compressor is a device that compresses fluids such as refrigerant gas, and is used in air conditioning systems for buildings and vehicles.

[0003] The compressors are classified into reciprocating compressors that compress refrigerant through reciprocating motion of pistons and rotary compressors that compress refrigerant through rotary motion according to the compression method. The reciprocating compressors are classified into crank compressors that transmit power to a plurality of pistons using a crank and swash plate compressors that transmit power to a rotating shaft on which a swash plate is installed according to the power transmission method. The rotary compressors are classified into vane rotary compressors that use a rotating rotary shaft and vanes and scroll compressors that use an orbiting scroll and a fixed scroll.

[0004] In addition, the compressor is classified into a mechanical compressor using an engine and an electric compressor using a motor (hereinafter, referred to as an electric compressor) according to the driving method.

[0005] FIG. 1 is a cross-sectional view illustrating a conventional electric compressor.

[0006] Referring to the accompanying FIG. 1, a conventional electric compressor includes a housing (2'), a compression mechanism (4') that compresses a refrigerant inside the housing (2'), a motor (6') that generates power required to drive the compression mechanism (4'), and a rotating shaft (7') that transmits the power of the motor (6') to the compression mechanism (4').

[0007] Here, the rotating shaft (7') passes through the motor (6') and includes a first end extending to the opposite side of the compression mechanism (4') and a second end extending to the compression mechanism (4') side, the first end being supported by a first radial bearing (91') and the second end being supported by a second radial bearing (92').

[0008] The first radial bearing (91') includes a first outer ring supported by the housing (2'), a first inner ring accommodated in the inner peripheral portion of the first outer ring to support the outer peripheral surface of the first end portion, and a first ball interposed between the first outer ring and the first inner ring.

[0009] The second radial bearing (92') includes a second outer ring supported by the housing (2'), a second inner ring accommodated in the inner peripheral portion of the second outer ring and supporting the outer peripheral surface of the second end portion, and second balls interposed between the second outer ring and the first inner ring.

[0010] However, in such a conventional electric compressor, there are problems in that the rotating shaft (7') vibrates in the axial direction during operation, increasing noise and damaging the bearings supporting the rotating shaft (7'). Summary of the Invention [Problem to be solved by the invention]

[0011] SUMMARY OF THE PRESENTLY PREFERRED EMBODIMENTS An object of the present invention is to provide an electric compressor capable of suppressing axial vibration of a rotating shaft during operation, thereby suppressing an increase in noise and preventing damage to a bearing supporting the rotating shaft. [Means for solving the problem]

[0012] In order to achieve the aforementioned object, the present invention provides an electric compressor including a housing, a compression mechanism that compresses a refrigerant inside the housing, a motor that generates power required for the compression mechanism, a rotating shaft that transmits the power of the motor to the compressor side, a bearing that supports the rotating shaft, and an elastic member that pressurizes the rotating shaft toward the compression mechanism.

[0013] The bearing may include a thrust bearing disposed between the elastic member and the rotating shaft.

[0014] The rotating shaft may include a first end extending through the motor and a second end extending to an opposite side of the first end and connected to the compression mechanism, and the housing may include a bearing groove into which the first end, the elastic member, and the thrust bearing are inserted, the elastic member being supported on a base surface of the bearing groove, and the thrust bearing being closely attached to a tip surface of the second end by the elastic member.

[0015] The thrust bearing may be formed of a plate-type sliding bearing.

[0016] The bearing may further include a first radial bearing that supports an outer circumferential surface of the second end portion within the bearing groove.

[0017] The first radial bearing may be formed of a bush-type sliding bearing.

[0018] An inner diameter of the bearing groove may be larger than an outer diameter of the plain bearing, and an adapter may be disposed between an inner peripheral surface of the bearing groove and an outer peripheral surface of the plain bearing.

[0019] When the first radial bearing is a rolling bearing, the inner diameter of the bearing groove may be equal to the outer diameter of the rolling bearing.

[0020] The rotating shaft may include a first end extending through the motor and a second end extending to an opposite side of the first end and connected to the compression mechanism, the first end may include a first portion and a second portion extending from the first portion to an opposite side of the motor, an outer diameter of the first portion may be larger than an outer diameter of the second portion, a stepped surface may be formed between the first portion and the second portion, the bearing may include a first radial bearing supporting an outer circumferential surface of the second portion, and the elastic member may be disposed between the first radial bearing and the stepped surface.

[0021] The bearing may further include a thrust bearing disposed between the elastic member and the stepped surface, the elastic member being supported by the first radial bearing, and the thrust bearing being in close contact with the stepped surface by the elastic member.

[0022] The elastic member may be supported by the first radial bearing and the stepped surface.

[0023] The first radial bearing may include an inner ring supported on an outer circumferential surface of the second portion, an outer ring accommodated in the inner ring and supported by the housing, and balls interposed between the inner ring and the outer ring, and the elastic member may be supported by the inner ring.

[0024] The housing may further include a second radial bearing supporting an outer peripheral surface of the first end portion, and the second radial bearing may include an inner ring press-fitted into the outer peripheral surface of the first end portion, an outer ring receiving the inner ring and supported by the housing, and balls interposed between the inner ring and the outer ring.

[0025] The inner ring includes an inner track into which one side of the ball is inserted, and the outer ring includes an outer track into which the other side of the ball is inserted, the inner track includes one side of the inner track disposed toward the compression mechanism based on a center of the ball and another side of the inner track disposed on an opposite side of the one side of the inner track, and the outer track includes one side of the outer track disposed toward the compression mechanism based on the center of the ball and another side of the outer track disposed on an opposite side of the one side of the outer track, and when the rotating shaft is pressed toward the compression mechanism, the inner ring is pressed toward the compression mechanism through the rotating shaft, and the balls can be supported in the axial direction by the other side of the inner track and the one side of the outer track.

[0026] The elastic member may be one of a wave spring, a conical coil spring, and a wire spring. Effect of the Invention

[0027] The electric compressor according to the present invention includes a housing, a compression mechanism that compresses a refrigerant inside the housing, a motor that generates power required for the compression mechanism, a rotating shaft that transmits power of the motor to the compressor side, a bearing that supports the rotating shaft, and an elastic member that presses the rotating shaft toward the compression mechanism side. This suppresses axial vibration of the rotating shaft during operation, thereby suppressing an increase in noise and preventing damage to the bearings that support the rotating shaft. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a cross-sectional view illustrating a conventional electric compressor. [Diagram 2] 1 is a cross-sectional view illustrating an electric compressor according to an embodiment of the present invention. [Diagram 3] FIG. 3 is an enlarged view of part A in FIG. 2. [Figure 4] FIG. 3 is an enlarged view of part B in FIG. [Diagram 5]6 is a cross-sectional view illustrating a bearing groove in an electric compressor according to another embodiment of the present invention. [Figure 6] 6 is a cross-sectional view illustrating a bearing groove in an electric compressor according to another embodiment of the present invention. [Figure 7] 6 is a cross-sectional view illustrating a bearing groove in an electric compressor according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an electric compressor according to the present invention will be described in detail with reference to the accompanying drawings.

[0030] FIG. 2 is a cross-sectional view illustrating an electric compressor according to an embodiment of the present invention, FIG. 3 is an enlarged view of a portion A in FIG. 2, and FIG. 4 is an enlarged view of a portion B in FIG.

[0031] 2 to 4, an electric compressor according to an embodiment of the present invention includes a housing (2), a compression mechanism (4) that compresses a refrigerant inside the housing (2), a motor (6) that generates power required for the compression mechanism (4), a rotating shaft (7) that transmits the power of the motor (6) to the compression mechanism (4), a bearing that supports the rotating shaft (7), and an inverter (8) that controls the motor (6).

[0032] The housing (2) includes a center housing (22), a front housing (24) coupled to the center housing (22) to form a motor accommodating space (S1) in which a motor (6) is accommodated, an inverter cover (26) coupled to the front housing (24) on the opposite side of the center housing (22) relative to the front housing (24) to form an inverter accommodating space (S2) in which an inverter (8) is accommodated, and a rear housing (28) coupled to the center housing (22) on the opposite side of the front housing (24) relative to the center housing (22) to form a compression mechanism accommodating space (S3) in which a compression mechanism (4) is accommodated.

[0033] Here, the center housing (22) includes a center housing partition (222) that separates the motor accommodating space (S1) from the compression mechanism accommodating space (S3), and a center housing annular wall (224) that extends along the outer periphery of the center housing partition (222). A bearing hole (222a) is formed in the center housing partition (222) into which the second end (74) of the rotating shaft (7) described later is inserted.

[0034] The front housing (24) includes a front housing partition (242) that separates the motor accommodating space (S1) from the inverter accommodating space (S2) and a front housing annular wall (244) that extends along the outer periphery of the front housing partition (242) and is fastened to the center housing annular wall (224). The front housing partition (242) has a bearing groove (242a) into which a first end (72) of the rotating shaft (7) described later is inserted.

[0035] The compression mechanism 4 includes a fixed scroll 42 and a revolving scroll 44 that meshes with the fixed scroll 42 to form a compression chamber together with the fixed scroll 42 and revolves around the rotary shaft 7. In this embodiment, the compression mechanism 4 is formed as a so-called scroll type, but is not limited thereto and may be formed in other types such as a reciprocating type or a vane rotary type.

[0036] The motor (6) includes a stator (62) supported on the front housing annular wall (244) and a rotor (64) located inside the stator (62) and rotated by interaction with the stator (62).

[0037] The rotating shaft (7) is coupled to the rotating shaft (7) and includes a first end (72) that penetrates the rotor (64), extends to the opposite side of the compression mechanism (4) and is inserted into the bearing groove (242a), and a second end (74) that extends toward the compression mechanism (4) and is inserted into the bearing hole (222a).

[0038] The bearing includes a first radial bearing (91) that supports the outer peripheral surface of the first end (72) inside the bearing groove (242a) and a second radial bearing (92) that supports the outer peripheral surface of the second end (74) inside the bearing hole (222a).

[0039] The first radial bearing (91) is formed of a bush-type sliding bearing, and the outer peripheral surface of the first radial bearing (91) is supported by the inner peripheral surface of the bearing groove (242a), and the inner peripheral surface of the first radial bearing (91) supports the outer peripheral surface of the first end portion (72).

[0040] Here, the outer diameter of the first end portion (72) is smaller than or equal to the inner diameter of the first radial bearing (91), so that the first end portion (72) is not press-fitted into the first radial bearing (91).

[0041] The first radial bearing 91 has an inner circumferential surface provided with a coating layer made of a material such as polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE).

[0042] The second radial bearing (92) is formed of a rolling bearing including a second outer ring (922) supported on the inner peripheral surface of the bearing hole (222a), a second inner ring (924) accommodated in the inner peripheral portion of the second outer ring (922) and supporting the outer peripheral surface of the second end (74), and second balls (926) interposed between the second outer ring (922) and the second inner ring (924).

[0043] Here, the outer diameter of the second end portion (74) is formed to be slightly larger than the inner diameter of the second inner ring (924), and the second end portion (74) is press-fitted into the second inner ring (924).

[0044] The second inner race (924) includes a second inner track (924t) into which one side of the second ball (926) is inserted.

[0045] The second inner track (924t) includes a second inner track one side (924ta) arranged on the compression mechanism (4) side based on the center of the second ball (926) and a second inner track other side (924tb) arranged on the opposite side of the second inner track one side (924ta) based on the center of the second ball (926).

[0046] The second outer ring (922) includes a second outer track (922t) into which the other side of the second ball (926) is inserted.

[0047] The second outer track (922t) includes a second outer track one side (922ta) arranged on the compression mechanism (4) side based on the center of the second ball (926) and a second outer track other side (922tb) arranged on the opposite side of the second outer track one side (922ta) based on the center of the second ball (926).

[0048] Here, the second inner track (924t) and the second outer track (922t) are formed to have a radius of curvature somewhat larger than that of the second ball (926) due to tolerances, etc., and the second inner ring (924) vibrates in the axial direction based on the second outer ring (922).

[0049] However, in the present embodiment, the elastic member (93) and thrust bearing (94) described below are provided, so that the second ball (926) is also supported in the axial direction by the other side (924tb) of the second inner track and one side (922ta) of the second outer track, thereby suppressing axial vibration of the second inner ring (924), which will be described in detail later.

[0050] On the other hand, the bearing further includes an elastic member (93) for applying pressure to the rotating shaft (7) toward the compression mechanism (4), and a thrust bearing (94) disposed between the elastic member (93) and the rotating shaft (7).

[0051] The elastic member (93) is formed of, for example, a wave spring.

[0052] The elastic member (93) is inserted into the bearing groove (242a), supported by the base surface of the bearing groove (242a), and disposed so as to face the tip surface of the first end portion (72).

[0053] The thrust bearing (94) is formed, for example, of a plate-type sliding bearing.

[0054] The thrust bearing (94) is inserted into the bearing groove (242a) and interposed between the elastic member (93) and the tip surface of the first end (72), and is brought into close contact with the tip surface of the first end (72) by the elastic member (93).

[0055] The surface of the thrust bearing 94 is provided with a coating layer made of a material such as polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE).

[0056] The inverter (8) includes a substrate (82) on which a plurality of elements (84) required for control are mounted.

[0057] The operation and effect of the electric compressor according to this embodiment will be described below.

[0058] That is, when power is applied to the motor (6), the rotor (64) and the rotating shaft (7) rotate to transmit power to the compression mechanism (4), and a low-temperature, low-pressure refrigerant flows into the motor accommodating space (S1). The refrigerant in the motor accommodating space (S1) flows into the compression mechanism (4) and is compressed to a high-temperature, high-pressure refrigerant, and then discharged to the outside of the housing (2).

[0059] During this process, the rotating shaft (7) is supported by the first radial bearing (91) and the second radial bearing (92). The first radial bearing (91) and the second radial bearing (92), which are formed to support the rotating shaft (7) mainly in the direction of the rotation radius, have limitations in terms of axial support, and axial vibrations may occur.

[0060] In consideration of this, in this embodiment, an elastic member 93 is provided, the rotating shaft 7 is pressed toward the compression mechanism 4, and the second inner ring 924 press-fitted into the rotating shaft 7 is pressed toward the compression mechanism 4 together with the rotating shaft 7 as shown in Fig. 4. As a result, the second balls 926 are not only supported in the radial direction of the rotating shaft 7 between the second inner ring 924 and the second outer ring 922, but are also supported in the axial direction by the other side surface 924tb of the second inner track and one side surface 922ta of the second outer track, so that the axial vibration of the rotating shaft 7 is suppressed, thereby preventing an increase in noise and damage to the second radial bearing 92.

[0061] The elastic member (93) itself also serves to suppress axial vibration of the rotating shaft (7).

[0062] Here, a thrust bearing 94 is provided between the elastic member 93 and the rotating shaft 7 to prevent direct contact between the elastic member 93 and the rotating shaft 7, thereby preventing the elastic member 93 and the rotating shaft 7 from damaging each other.

[0063] In this embodiment, the elastic member 93 is formed of a wave spring, and the thrust bearing 94 is formed of a plate-type sliding bearing, but is not limited thereto. That is, for example, the elastic member 93 can be formed of a coil spring, a conical coil spring, etc., and the thrust bearing 94 can be formed of other types of bearings. However, in order to reduce size, it is preferable that the elastic member 93 is formed of a wave spring, and the thrust bearing 94 is formed of a plate-type sliding bearing.

[0064] Meanwhile, in this embodiment, the first radial bearing (91) is formed of a bush-type sliding bearing, which reduces damage caused by axial vibration of the rotating shaft (7) compared to when the first radial bearing (91) is formed of a rolling bearing such as the second radial bearing (92).

[0065] In addition, since the first radial bearing 91 is a bush-type sliding bearing, the rotational inertia is smaller than that of a rolling bearing, and therefore the efficiency of the electric compressor is improved, noise and vibration are reduced, and durability is improved.

[0066] In addition, since the first radial bearing (91) is a bush-type sliding bearing, the diameter of the bearing groove (242a) can be reduced compared to when the first radial bearing (91) is a rolling bearing, thereby reducing the weight and cost of the electric compressor.

[0067] Here, in this embodiment, the first radial bearing (91) is formed of a sliding bearing, and the inner diameter of the bearing groove (242a) is formed to correspond to the outer diameter of the sliding bearing type first radial bearing (91), but is not limited to this.

[0068] For example, referring to FIG. 5 showing the bearing groove 242a' of an electric compressor according to another embodiment of the present invention, the first radial bearing 91 is formed as a sliding bearing as in the above embodiment, but the inner diameter of the bearing groove 242a' is formed larger than the outer diameter of the first radial bearing 91. That is, the inner diameter of the bearing groove 242a' is formed to be equal to the outer diameter of the first radial bearing 91' of a rolling bearing type (the conventional first radial bearing 91). Instead, an adapter 95 is provided between the inner peripheral surface of the bearing groove 242a' and the outer peripheral surface of the first radial bearing 91 of a sliding bearing type. In this case, the front housing 24 of the electric compressor using the sliding bearing type first radial bearing 91 can be shared with the front housing 24' of the electric compressor using the rolling bearing type first radial bearing 91', thereby preventing an increase in cost due to dual specifications.

[0069] Alternatively, although not shown, the inner diameter of the bearing groove (242a') is formed to be equal to the outer diameter of the rolling bearing type first radial bearing (91'), and the rolling bearing type first radial bearing (91') can be used instead of the sliding type first radial bearing (91) and adapter (95). That is, the rolling bearing type first radial bearing (91') includes a first outer ring supported on the inner circumferential surface of the bearing groove (242a'), a first inner ring accommodated in the inner circumferential part of the first outer ring and supporting the outer circumferential surface of the first end (72), and a first ball interposed between the first outer ring and the first inner ring. In this case, the first radial bearing (91') is formed of a rolling bearing that is relatively vulnerable to the axial vibration of the rotating shaft (7) and is provided with an elastic member (93), so that damage to the rolling bearing type first radial bearing (91') due to the axial vibration of the rotating shaft (7) can be prevented. However, in order to obtain the effects described above, it is preferable that the first radial bearing is formed of a sliding bearing.

[0070] Meanwhile, in this embodiment, the elastic member (93) is provided between the base surface of the bearing groove (242a) and the tip surface of the first end (72) of the rotating shaft (7), but is not limited to this.

[0071] That is, for example, as shown in Fig. 6, the first end (72) of the rotating shaft (7) includes a first portion (72a) and a second portion (72b) extending from the first portion (72a) to the opposite side of the motor, the outer diameter of the first portion (72a) is larger than the outer diameter of the second portion (72b), and a stepped surface (72c) is formed between the first portion (72a) and the second portion (72b). At this time, a first radial bearing (91') supports the outer circumferential surface of the second portion (72b), and an elastic member (93) and a thrust bearing (94) are provided between the first radial bearing (91') and the stepped surface (72c), the elastic member (93) is supported by the first radial bearing (91'), and the thrust bearing (94) is in close contact with the stepped surface (72c) by the elastic member (93). Here, since the elastic member (93) is rotatable, it is preferable that the elastic member (93) is supported by the first inner ring of the first radial bearing (91') in order to reduce friction with the first radial bearing (91').

[0072] Meanwhile, in the embodiment shown in Fig. 6, a thrust bearing 94 is provided, but the present invention is not limited thereto. That is, as shown in Fig. 7, the thrust bearing 94 is not provided, and the elastic member 93 can be supported by the first radial bearing 91' and the stepped surface 72c of the first end 72 of the rotating shaft 7.

[0073] Here, the elastic member (93) in the embodiment shown in FIG. 6 is formed of a conical coil spring, and the elastic member (93) in the embodiment shown in FIG. 7 is formed of a wave spring, but is not limited thereto and may be formed of other springs. [Explanation of symbols]

[0074] 2, 2' Housing 4, 4' Compression mechanism 6, 6' motor 7, 7' Rotation axis 8. Inverter 22 Center Housing 24, 24' Front Housing ( 26 Inverter cover 28 Rear housing 42 Fixed Scroll 44 Swivel Scroll 62 Stator 64 Rotor 72 First end 72a Part 1 72b Part 2 72c step surface 74 Second end 82 Substrate 84 elements 91, 91' 1st radial bearing 92, 92' Second radial bearing 93 Elastic Members 94 Thrust bearing 95 Adapter 222 Center housing bulkhead 222a Bearing hole 224 Center housing annular wall 242 Front housing bulkhead 242a, 242a' bearing groove 244 Front housing annular wall 922 Second outer wheel 922t 2nd outer track 922ta 2nd outer track, one side 922tb 2nd outer track other side 924 Second Inner Ring 924t 2nd inner track 924ta 2nd inner track, one side 924tb 2nd inner track other side 926 2nd Ball

Claims

1. 1. An electric compressor comprising: a housing; a compression mechanism that compresses a refrigerant inside the housing; a motor that generates power required for the compression mechanism; a rotating shaft that transmits the power of the motor to the compressor side; a bearing that supports the rotating shaft; and an elastic member that pressurizes the rotating shaft toward the compression mechanism.

2. 2. The electric compressor according to claim 1, wherein the bearing includes a thrust bearing disposed between the elastic member and the rotating shaft.

3. 3. The electric compressor of claim 2, wherein the rotating shaft includes a first end extending through the motor and a second end extending to an opposite side of the first end to be connected to the compression mechanism, the housing includes a bearing groove into which the first end, the elastic member and the thrust bearing are inserted, the elastic member being supported by a base surface of the bearing groove, and the thrust bearing being tightly attached to a tip surface of the first end by the elastic member.

4. 3. The electric compressor according to claim 2, wherein the thrust bearing is a plate-type sliding bearing.

5. 4. The electric compressor according to claim 3, wherein the bearing further comprises a first radial bearing supporting an outer circumferential surface of the first end portion within the bearing groove.

6. 6. The electric compressor according to claim 5, wherein the first radial bearing is a bush-type plain bearing.

7. 7. The electric compressor according to claim 6, wherein an inner diameter of the bearing groove is larger than an outer diameter of the plain bearing, and an adapter is disposed between an inner peripheral surface of the bearing groove and an outer peripheral surface of the plain bearing.

8. 8. The electric compressor according to claim 7, wherein, when the first radial bearing is a rolling bearing, an inner diameter of the bearing groove is equal to an outer diameter of the rolling bearing.

9. 2. The electric compressor of claim 1, wherein the rotating shaft includes a first end extending through the motor and a second end extending to an opposite side of the first end and connected to the compression mechanism, the first end includes a first portion and a second portion extending from the first portion to an opposite side of the motor, an outer diameter of the first portion is larger than an outer diameter of the second portion, a stepped surface is formed between the first portion and the second portion, the bearing includes a first radial bearing supporting an outer peripheral surface of the second portion, and the elastic member is disposed between the first radial bearing and the stepped surface.

10. 10. The electric compressor according to claim 9, wherein the bearing further comprises a thrust bearing disposed between the elastic member and the stepped surface, the elastic member being supported by the first radial bearing, and the thrust bearing being brought into close contact with the stepped surface by the elastic member.

11. 10. The electric compressor according to claim 9, wherein the elastic member is supported by the first radial bearing and the stepped surface.

12. 10. The electric compressor according to claim 9, wherein the first radial bearing includes an inner ring supported on an outer circumferential surface of the second portion, an outer ring accommodating the inner ring and supported by the housing, and balls interposed between the inner ring and the outer ring, and the elastic member is supported by the inner ring.

13. 4. The electric compressor of claim 3, further comprising a second radial bearing supporting an outer peripheral surface of the second end portion, the second radial bearing including an inner ring press-fitted onto the outer peripheral surface of the second end portion, an outer ring receiving the inner ring and supported by the housing, and balls interposed between the inner ring and the outer ring.

14. 14. The electric compressor according to claim 13, wherein the inner ring includes an inner track into which one side of the ball is inserted, the outer ring includes an outer track into which the other side of the ball is inserted, the inner track includes one side of the inner track disposed on the compression mechanism side with respect to a center of the ball and another side of the inner track disposed on an opposite side to the one side of the inner track, the outer track includes one side of the outer track disposed on the compression mechanism side with respect to the center of the ball and another side of the outer track disposed on the opposite side to the one side of the outer track, and when the rotating shaft is pressed toward the compression mechanism, the inner ring is pressed toward the compression mechanism through the rotating shaft, and the balls are supported in the axial direction by the other side of the inner track and the one side of the outer track.

15. 2. The electric compressor according to claim 1, wherein the elastic member is one of a wave spring, a conical coil spring, and a wire spring.

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