Co-rotating scroll compressor

Abstract

A co-rotating scroll compressor includes a bearing cover body having a greater strength than a strength of a driving scroll end plate. The bearing cover body is fixed to an end surface of the driving scroll end plate opposite from a compression chamber on one side, and a restricting portion is provided in the driving scroll peripheral wall on the other side. The bearing cover body has a supported portion formed integrally with the bearing cover body. The driving mechanism includes a rotor surrounding the driving scroll from an outer peripheral side, and disposed on an outer peripheral surface of the driving scroll. A movement of the rotor to the one side in the direction of the driving axis is restricted by the bearing cover body, and a movement of the rotor to the other side in the direction of the driving axis is restricted by the restricting portion.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a National Stage of International Application No. PCT / JP2023 / 042192 filed Nov. 24, 2023, claiming priority based on Japanese Patent Application No. 2023-034189 filed Mar. 7, 2023.TECHNICAL FIELD

[0002] The present disclosure relates to a co-rotating scroll compressor.BACKGROUND ART

[0003] A conventional co-rotating scroll compressor is disclosed in the Patent Document 1. This co-rotating scroll compressor includes a driving mechanism, a driving scroll, a driven mechanism, a driven scroll, and a housing.

[0004] The driving scroll makes driving rotation around a driving axis by the driving mechanism. The driven scroll is disposed eccentric to the driving scroll, and makes driven rotation around a driven axis by the driving scroll and the driven mechanism.

[0005] The driving scroll has a driving scroll end plate, a driving scroll peripheral wall, and a driving scroll spiral body. The driving scroll end plate extends in a direction intersecting with the driving axis. The driving scroll peripheral wall protrudes in a tubular shape from the driving scroll end plate toward the driven scroll. The driving scroll spiral body protrudes in a spiral shape from the driving scroll end plate toward the driven scroll inside the driving scroll peripheral wall.

[0006] The driven scroll has a driven scroll end plate and a driven scroll spiral body. The driven scroll end plate extends in a direction intersecting with the driven axis. The driven scroll spiral body protrudes in a spiral shape from the driven scroll end plate toward the driven scroll.

[0007] The driving scroll and the driven scroll form a compression chamber with the driving scroll spiral body and the driven scroll spiral body facing with each other, and change a volume of the compression chamber by the driving rotation and the driven rotation

[0008] The driving scroll end plate and the driven scroll end plate are integrally formed with a supported portion, which is rotatably supported by the housing via a bearing, on the rear side of the compression chamber.

[0009] The driving mechanism includes a rotor that has a cylindrical shape, surrounds the driving scroll from an outer peripheral side, and is fixed to the driving scroll.CITATION LISTPatent LiteraturePatent Literature 1: Japanese Patent Application Publication No. 2002-310073SUMMARY OF THE INVENTIONTechnical Problem

[0011] In the above-mentioned conventional co-rotating scroll compressor, it is necessary to prevent the rotor from being detached from the driving scroll in the direction of the driving axis. In this case, if a bolt is used to prevent detachment of the rotor, for example, formation of a bolt hole reduces the strength of the rotor, which may reduce the durability of the rotor.

[0012] On the other hand, in view of weight reduction, for example, the driving scroll may be made of an aluminum alloy. In this case, there is a risk that the supported portion, which is integrally formed with the driving scroll end plate and rotatably supported by the bearing, may not have a strength to bear the bearing load.

[0013] The present disclosure has been made in view of the above-mentioned conventional circumstance, and is directed to providing a co-rotating scroll compressor in which a supported portion, which is rotatably supported by a bearing, can bear a bearing load, and detachment of a rotor from the driving scroll is prevented without reducing the durability of the rotor.Solution to Problem

[0014] A co-rotating scroll compressor of the present disclosure includes a housing, a driving mechanism, a driving scroll, a driven scroll, and a driven mechanism,

[0015] the driving scroll being configured to make driving rotation around a driving axis by the driving mechanism,

[0016] the driven scroll being eccentric to the driving scroll, and configured to make driven rotation around a driven axis by the driving scroll and the driven mechanism,

[0017] the driving scroll having a driving scroll end plate that extends in a direction intersecting with the driving axis, a driving scroll peripheral wall that protrudes in a tubular shape from the driving scroll end plate toward the driven scroll, and a driving scroll spiral body that protrudes in a spiral shape from the driving scroll end plate toward the driven scroll inside the driving scroll peripheral wall,

[0018] the driven scroll having a driven scroll end plate that extends in a direction intersecting with the driven axis, and a driven scroll spiral body that protrudes in a spiral shape from the driven scroll end plate toward the driving scroll, and

[0019] the driving scroll and the driven scroll forming a compression chamber with the driving scroll spiral body and the driven scroll spiral body facing with each other, and changing a volume of the compression chamber by the driving rotation and the driven rotation, wherein

[0020] a bearing cover body having a greater strength than the driving scroll end plate is fixed to an end surface of the driving scroll end plate opposite from the compression chamber on one side of the driving scroll in a direction of the driving axis, and a restricting portion is provided in the driving scroll peripheral wall on the other side of the driving scroll in the direction of the driving axis,

[0021] the bearing cover body has a supported portion that is formed integrally with the bearing cover body and rotatably supported by the housing via a bearing,

[0022] the driving mechanism includes a rotor that has a tubular shape, surrounds the driving scroll from an outer peripheral side, and is disposed on an outer peripheral surface of the driving scroll, and

[0023] a movement of the rotor to the one side in the direction of the driving axis is restricted by the bearing cover body, and a movement of the rotor to the other side in the direction of the driving axis is restricted by the restricting portion.

[0024] In the co-rotating scroll compressor of the present disclosure, the bearing cover body having a greater strength than the driving scroll end plate is fixed to the end surface of the driving scroll end plate opposite from the compression chamber on the one side of the driving scroll in the direction of the driving axis, and the restricting portion is provided in the driving scroll peripheral wall on the other side of the driving scroll in the direction of the driving axis, In addition, the movement of the rotor, which is disposed on an outer peripheral surface of the driving scroll, to the one side in the direction of the driving axis is restricted by the bearing cover body, and the movement of the rotor to the other side in the direction of the driving axis is restricted by the restricting portion. Therefore, the bearing cover body and the restricting portion can prevent the rotor from being detached from the driving scroll in the direction of the driving axis.

[0025] In this case, the strength of the rotor is not reduced by forming a bolt hole or the like, and hence the durability of the rotor is not reduced.

[0026] In the co-rotating scroll compressor, the bearing cover body has the supported portion rotatably supported by the housing via the bearing, and the bearing cover body has a strength greater than that of the driving scroll end plate. Therefore, the supported portion can bear the bearing load.

[0027] Accordingly, the co-rotating scroll compressor of the present disclosure allows the supported portion rotatably supported by the bearing to bear a bearing load, and prevents the rotor from being detached from the driving scroll without reducing the durability of the rotor.

[0028] The driving scroll preferably has a rotor accommodation portion that is formed in the driving scroll end plate and the driving scroll peripheral wall, the rotor being disposed on an outer peripheral surfaces of the rotor accommodation portion, and a peripheral wall shoulder portion provided in the driving scroll peripheral wall, the peripheral wall shoulder portion having an outer diameter larger than an outer diameter of the rotor accommodation portion. A shoulder portion end surface of the peripheral wall shoulder portion facing the one side in the direction of the driving axis preferably forms the restricting portion

[0029] In this case, the movement of the rotor, which is disposed in the rotor accommodation portion, to the one side in the direction of the driving axis is restricted by the bearing cover body, and the movement of the rotor to the other side in the direction of the driving axis is restricted by the shoulder portion end surface of the peripheral wall shoulder portion.

[0030] It is preferable that the bearing cover body is made of a magnetic material, and an intermediate member made of a non-magnetic material is interposed between the bearing cover body and the rotor.

[0031] In this case, even if the bearing cover body is made of a low-cost magnetic material, magnetic flux leakage through the bearing cover body can be suppressed by the intermediate member.

[0032] The bearing cover body is preferably made of a non-magnetic material.

[0033] In this case, it is possible to prevent magnetic flux leakage through the bearing cover body.

[0034] It is preferable that the end surface of the driving scroll end plate opposite from the compression chamber and a facing surface of the bearing cover body facing the end surface are in surface contact with each other.

[0035] In this case, it is advantageous to fix the bearing cover body to the driving scroll end plate in an adequate posture, and secure that the driving axis and the supported portion are disposed coaxially.Advantageous Effects of Invention

[0036] The co-rotating scroll compressor of the present disclosure allows the supported portion rotatably supported by the bearing to bear a bearing load, and prevents the rotor from being detached from the driving scroll without reducing the durability of the rotor.BRIEF DESCRIPTION OF DRAWINGS

[0037] FIG. 1 is a cross-sectional view of a co-rotating scroll compressor of a first embodiment.

[0038] FIG. 2 is a cross-sectional view of the co-rotating scroll compressor of the first embodiment, taken along line A-A in FIG. 1.

[0039] FIG. 3 is a cross-sectional view of a co-rotating scroll compressor of a second embodiment.DESCRIPTION OF EMBODIMENTS

[0040] The following will describe a first embodiment and a second embodiment of the present disclosure with reference to the accompanying drawings.First embodiment

[0041] As illustrated in FIG. 1, a co-rotating scroll compressor (hereinafter, simply referred to as a compressor) of the first embodiment includes a housing 60, an electric motor 10, a driving scroll 30, a driven scroll 40, and a driven mechanism 20. The electric motor 10 is an example of a “driving mechanism” of the present disclosure. This compressor is mounted on a vehicle (not illustrated), and forms a part of a vehicle air conditioner.

[0042] In the present embodiment, a front-rear direction of the compressor is defined by a solid arrow illustrated in FIG. 1. It is noted that the front-rear direction is an example for convenience of explanation, and a posture of the compressor may be changed, as appropriate, depending on the vehicle on which the compressor is mounted.

[0043] The housing 60 includes a housing body 61 and a cover 65. The housing body 61 is a bottomed tubular member having an outer peripheral wall 62 and a bottom wall 63. The outer peripheral wall 62 has a cylindrical shape extending around a driving axis R1 and has an inner peripheral surface 62B. The driving axis R1 is parallel to the front-rear direction. In the following description, the front corresponds to one side in a direction of the driving axis R1, and the rear refers to the other side in the direction of the driving axis R1.

[0044] The bottom wall 63 is located at a rear end of the housing body 61. The bottom wall 63 has a substantially circular flat plate shape extending perpendicularly to the driving axis R1. An outer peripheral edge of the bottom wall 63 is connected to a rear end of the outer peripheral wall 62. A second shaft supporting portion 64 is provided in a center of an inner surface of the bottom wall 63, and has a columnar shape protruding forward with a driven axis R2 at the center. The driven axis R2 is eccentric to the driving axis R1 and extends in parallel to the driving axis R1. An inner ring of a bearing 71 is fitted onto the second shaft supporting portion 64.

[0045] An inverter case having a connector portion is connected to a rear of the housing body 61. An inverter circuit having a circuit board, switching elements, and the like is accommodated in the inverter case. The inverter circuit is electrically connected to a battery of the vehicle through a connector and to a stator 17, which will be described later, through a hermetic passage formed in the bottom wall 63. Thus, the inverter circuit converts DC current supplied from the battery to AC current, and supplies its power to the stator 17. It is noted that illustrations of the hermetic passage, the connector, the inverter case, the inverter circuit, and the battery are omitted.

[0046] The cover 65 is disposed in front of the housing body 61. The cover 65 extends in a substantially circular flat plate shape perpendicular to the driving axis R1. The cover 65 is fastened to the outer peripheral wall 62 by bolts, which are not illustrated, with an outer peripheral edge of the cover 65 in contact with a front end of the outer peripheral wall 62 of the housing body 61. Thus, the cover 65 closes the housing body 61 from the front thereof. As a result, a suction chamber 61A is formed in the housing body 61.

[0047] A first shaft supporting portion 66 is formed at a center of an inner surface of the cover 65 and has a cylindrical shape protruding around the driving axis R1. An outer ring of a needle roller bearing 72 is fitted into the first shaft supporting portion 66. The needle roller bearing 72 is an example of the “bearing” of the present disclosure.

[0048] The cover 65 has a suction communication port 65A and a discharge communication port 65B. The suction communication port 65A is located between an outer peripheral edge of the cover 65 and the first shaft supporting portion 66, and extends through the cover 65 in parallel to the driving axis R1. The suction communication port 65A provides communication between the suction chamber 61A and an outside of the compressor. A tube (not illustrated) is connected to the suction communication port 65A. Thus, refrigerant at low temperature and low pressure after flowing through an evaporator is drawn into the suction chamber 61A through the tube.

[0049] The discharge communication port 65B is located at a center of the cover 65 and extends through the cover 65 in a direction in parallel to the driving axis R1 so as to be opened to an inside of the first shaft supporting portion 66. A tube (not illustrated) is connected to the discharge communication port 65B, and the discharge communication port 65B allows refrigerant gas discharged to a discharge portion 38B, which will be described later, to flow toward a condenser. It is noted that illustrations of the tube, the evaporator, and the condenser are omitted.

[0050] The electric motor 10 is accommodated in the suction chamber 61A. Thus, the suction chamber 61A also serves as a motor chamber in which the electric motor 10 is accommodated. The electric motor 10 includes the stator 17 and a rotor 11.

[0051] The stator 17 has a cylindrical shape extending around the driving axis R1, and has a winding 18. The stator 17 is fitted into the inner peripheral surface 62B of the outer peripheral wall 62 of the housing body 61, so that the stator 17 is fixed to the housing body 61, and hence the housing 60.

[0052] The rotor 11 has a cylindrical shape extending around the driving axis R1 and disposed inside the stator 17. A center O of the rotor 11 coincides with the driving axis R1. The rotor 11 has a front surface 111 and a rear surface 112 located opposite from the front surface 111. Although a detailed illustration is omitted, the rotor 11 includes a plurality of permanent magnets 12 corresponding to the stator 17 and stacking steel plates for fixing the permanent magnets 12. As illustrated in FIG. 2, the permanent magnets 12 are arranged at equal intervals in a circumferential direction of the driving scroll 30.

[0053] The driving scroll 30 has a driving scroll end plate 31, a driving scroll peripheral wall 32, and a driving scroll spiral body 33. The driving scroll end plate 31, the driving scroll peripheral wall 32, and the driving scroll spiral body 33 are integrally formed. The driving scroll 30 is made of a non-magnetic material. Specifically, the driving scroll 30 is made of an aluminum alloy.

[0054] The driving scroll end plate 31 has a substantially circular plate shape extending perpendicularly to the driving axis R1. The driving scroll end plate 31 has a front surface 311 and a rear surface 312 located opposite from the front surface 311. The front surface 311 corresponds to an “end surface of the driving scroll end plate opposite from a compression chamber” in the present disclosure.

[0055] A discharge valve chamber 34 is formed in the front surface 311 of the driving scroll end plate 31. The discharge valve chamber 34 is formed of a recess that is partially recessed in the front surface 311 toward a compression chamber 55, which will be described later. The discharge valve chamber 34 has an inner surface shape substantially corresponding to an outer shape of a discharge valve mechanism 56, which will be described later, so that the discharge valve chamber 34 can accommodate the discharge valve mechanism 56. Furthermore, a discharge port 35 is formed near a center of the driving scroll end plate 31 and extends through the driving scroll end plate 31 in the front-rear direction. The discharge port 35 provides communication between the compression chamber 55 and the discharge valve chamber 34.

[0056] The discharge valve mechanism 56 is disposed in the discharge valve chamber 34. The discharge valve mechanism 56 includes a discharge reed valve 57, a retainer 58, and a fixing bolt 59. The discharge reed valve 57 and the retainer 58 are fixed to a bottom surface of the discharge valve chamber 34 by the fixing bolt 59. The discharge reed valve 57 is capable of opening and closing the discharge port 35. In addition, the retainer 58 is capable of adjusting an opening degree of the discharge reed valve 57.

[0057] The driving scroll spiral body 33 is located inside the driving scroll peripheral wall 32. The driving scroll spiral body 33 extends rearward in parallel to the driving axis R1 from the rear surface 312 of the driving scroll end plate 31. The driving scroll spiral body 33 is formed using an involute curve and has a spiral shape around the driving axis R1. As illustrated in FIG. 2, as viewed from the rear, the driving scroll spiral body 33 is formed in a left-handed spiral shape around the driving axis R1 from a center of the spiral. An end of the driving scroll spiral body 33 on an outer peripheral side thereof is connected to the driving scroll peripheral wall 32. In FIG. 2, the discharge port 35, which should be visible from the rear, is omitted.

[0058] The driving scroll peripheral wall 32 extends rearward, i.e., toward the driven scroll 40, in parallel to the driving axis R1 from the outer peripheral edge of the driving scroll end plate 31. The driving scroll peripheral wall 32 has a substantially cylindrical shape extending around the driving axis R1.

[0059] A bearing cover body 36 is fixed to the front surface 311 of the driving scroll end plate 31 on the front side of the driving scroll 30. The bearing cover body 36 is made of a magnetic material. Specifically, the bearing cover body 36 is made of an iron-based alloy having a greater strength than that of the driving scroll 30.

[0060] The bearing cover body 36 has a cover portion 37 and a first boss 38 formed integrally with the cover portion 37. The first boss 38 is an example of a “supported portion” in the present disclosure.

[0061] The cover portion 37 has a substantially circular plate shape extending perpendicularly to the driving axis R1. A through hole 37B is formed at a center of the cover portion 37.

[0062] The first boss 38 protrudes forward from an inner peripheral edge of the cover portion 37, that is, a center of the cover portion 37. The first boss 38 has a cylindrical shape extending in the direction of the driving axis R1 around the driving axis R1. An inner space of the first boss 38 having a columnar shape forms the discharge portion 38B. In this compressor, the discharge valve chamber 34 and the discharge portion 38B form a discharge chamber.

[0063] The cover portion 37 of the bearing cover body 36 and the driving scroll end plate 31 of the driving scroll 30 are fastened together with a plurality of bolts 50 extending in parallel to the driving axis R1. In a state fastened together with the bolts 50, the front surface 311 of the driving scroll end plate 31 and a rear surface 371 of the cover portion 37 facing the front surface 311 in the front-rear direction are in surface contact with each other. The rear surface 371 of the cover portion 37 corresponds to a “facing surface” of the present disclosure.

[0064] The driven scroll 40 has a driven scroll end plate 41, and a driven scroll spiral body 42. The driven scroll end plate 41 and the driven scroll spiral body 42 are integrally formed. The driven scroll 40 is made of a non-magnetic material. Specifically, the driven scroll 40 is made of an aluminum alloy.

[0065] The driven scroll end plate 41 has a substantially circular plate shape extending perpendicularly to the driven axis R2. The driven scroll end plate 41 has a front surface 411 and a rear surface 412 located opposite from the front surface 411. A second boss 43 is formed at a center of the rear surface 412 so as to protrude toward the bottom wall 63. The second boss 43 has a cylindrical shape extending around the driven axis R2.

[0066] The driven scroll end plate 41 has a suction port 44. The suction port 44 extends through the driven scroll end plate 41 in the direction of the driven axis R2, i.e., the front-rear direction, at a position radially outward relative to the second boss 43.

[0067] The driven scroll spiral body 42 extends forward in parallel to the driven axis R2 from the front surface 411 of the driven scroll end plate 41. The driven scroll spiral body 42 is formed using the involute curve and has a spiral shape around the driven axis R2. More specifically, as viewed from the rear, the driven scroll spiral body 42 is formed in a left-handed spiral shape around the driven axis R2 from a center of the spiral, as illustrated in FIG. 2.

[0068] The driven mechanism 20 includes four anti-rotation pins 21 and four rings 22. It is noted that the number of the anti-rotation pins 21 and the number of the rings 22 may be designed appropriately as long as each of them is three or more. In addition, two of the anti-rotation pins 21 and two of the rings 22 are illustrated in FIG. 1. The driving scroll 30 and the driven scroll 40 define a compression chamber 55 with the driving scroll spiral body 33 and the driven scroll spiral body 42 facing each other.

[0069] The anti-rotation pins 21 are fixed to a rear surface of a peripheral wall shoulder portion 81 of the driving scroll 30, which will be described later. The rings 22 are fixed to the front surface 411 of the driven scroll end plate 41 so as to face their associated anti-rotation pins 21.

[0070] In the compressor of the first embodiment, a rotor accommodation portion 80 is formed in outer peripheral surfaces of the driving scroll end plate 31 and the driving scroll peripheral wall 32. The rotor accommodation portion 80 extends rearward from the front surface 311 of the driving scroll end plate 31 to the driving scroll peripheral wall 32. An outer peripheral surface of the rotor accommodation portion 80 has a columnar shape corresponding to an inner peripheral surface of the rotor 11. The rotor 11 is disposed on the outer peripheral surface of the rotor accommodation portion 80. An outer diameter of the rotor accommodation portion 80 is slightly smaller than an inner diameter of the rotor 11. That is, the rotor 11 and the rotor accommodation portion 80 are fitted together by a clearance fit. In this manner, the rotor 11 is disposed on the outer circumferential surface of the driving scroll 30 while surrounding the driving scroll 30 from the outer peripheral side.

[0071] Further, the peripheral wall shoulder portion 81 having an annular shape is formed in the outer peripheral surface of a rear end portion of the driving scroll peripheral wall 32. The peripheral wall shoulder portion 81 is provided at the rear of the rotor accommodation portion 80 and is continuous with the rotor accommodation portion 80. An outer diameter of the peripheral wall shoulder portion 81 is greater than an outer diameter of the rotor accommodation portion 80. Specifically, the outer diameter of the peripheral wall shoulder portion 81 is greater than the outer diameter of the rotor accommodation portion 80 by a thickness of the rotor 11 in the radial direction thereof. A front surface of the peripheral wall shoulder portion 81, that is, a shoulder portion end surface 811 facing forward of the peripheral wall shoulder portion 81, is in contact with the rear surface 112 of the rotor 11. The shoulder portion end surface 811 is an example of a “restricting portion” of the present disclosure.

[0072] As illustrated in FIG. 2, the driving scroll 30 has a first region S and a second region other than the first region S in the outer peripheral surface of the driving scroll 30 in the circumferential direction thereof. The first region S includes a connection portion 82 where an end of the driving scroll spiral body 33 on an outer peripheral side thereof is connected to the driving scroll peripheral wall 32. In addition, the first region S includes a portion of the driving scroll peripheral wall 32. The second region includes the driving scroll peripheral wall 32 other than the portion of the driving scroll peripheral wall 32 in the first region S.

[0073] The driving scroll peripheral wall 32 has a thick-walled portion 85 in the first region S where a first inner surface 83 of the driving scroll peripheral wall 32 facing inward in a radial direction of the driving scroll 30 is positioned more inward in the radial direction than a second inner surface 84 of the driving scroll peripheral wall 32 in the second region facing inward in the radial direction.

[0074] Further, the first inner surface 83 of the driving scroll peripheral wall 32 in the first region S is formed along an involute curve which is an extension of the involute curve drawn by an inner side surface 331 of the driving scroll spiral body 33. That is, the involute curve which is the extension of the involute curve drawn by the inner side surface 331 of the driving scroll spiral body 33 coincides with the involute curve drawn by the first inner surface 83 of the driving scroll peripheral wall 32 in the first region S. This involute curve extends over the entire first region S, but an end of the involute curve does not extend into the second region.

[0075] A recess 87 is formed in an outer surface 86 in the first region S facing outward in the radial direction of the driving scroll 30. A protrusion 114, which engages with the recess 87, is formed in a facing inner surface 113 of the rotor 11 that faces the outer surface 86 of the driving scroll 30 in the radial direction.

[0076] The recess 87 and the protrusion 114 extend in the front-rear direction and have a constant cross-section having a substantially rectangular shape. The recess 87 and the protrusion 114 extend in the front-rear direction from a position of the front surface 311 of the driving scroll end plate 31 to a position of the shoulder portion end surface 811 of the peripheral wall shoulder portion 81. Further, the recess 87 and the protrusion 114 are disposed facing one of the permanent magnets 12 in the radial direction of the driving scroll 30. In other words, the recess 87 and the protrusion 114 are arranged so as to avoid gaps between the permanent magnets 12 disposed adjacent to each other.

[0077] An end ring 51 is disposed in front of the rotor 11 in the rotor accommodation portion 80. The end ring 51 is an example of an “intermediate member” of the present disclosure. The end ring 51 is made of a non-magnetic material. Specifically, the end ring 51 is made of an aluminum alloy. The end ring 51 is interposed between the bearing cover body 36 and the rotor 11, and is held between the rear surface 371 of the cover portion 37 and the front surface 111 of the rotor 11.

[0078] In the compressor having the above-described configuration, the inverter circuit (not illustrated) controls operation of the electric motor 10 while supplying power to the stator 17 to operate the electric motor 10. This rotates the rotor 11, which causes the driving scroll 30 to make driving rotation around the driving axis R1 in the suction chamber 61A. That is, the driving scroll 30 including the rotor 11 integrated therewith makes driving rotation. At this time, in the driven mechanism 20, the anti-rotation pins 21 slide on their associated inner peripheral surfaces of the rings 22 to rotate the rings 22 relative to the anti-rotation pins 21 around the center thereof. Thus, the driven mechanism 20 transmits torque of the driving scroll 30 to the driven scroll 40.

[0079] As a result, the driven scroll 40 makes driven rotation around the driven axis R2 by the driving scroll 30 and the driven mechanism 20. At this time, the driven mechanism 20 prevents the driven scroll 40 from rotating. Thus, the driving scroll 30 and the driven scroll 40 cause the driven scroll 40 to make orbital motion around the driving axis R1 relative to the driving scroll 30 by the driving rotation of the driving scroll 30 and the driven rotation of the driven scroll 40, thereby changing a volume of the compression chamber 55.

[0080] As a result, refrigerant gas in the suction chamber 61A is drawn into the compression chamber 55 through the suction port 44, and compressed in the compression chamber 55. Then, the refrigerant gas compressed to a discharge pressure in the compression chamber 55 is discharged to the discharge valve chamber 34 through the discharge port 35, flows though the discharge portion 38B, and is then discharged to the condenser through the discharge communication port 65B. In this manner, air conditioning is performed by the vehicle air conditioner.

[0081] Here, in this compressor, the bearing cover body 36 is fixed to the front surface 311 of the driving scroll end plate 31 on the front side of the driving scroll 30, and the peripheral wall shoulder portion 81 is provided in the driving scroll peripheral wall 32 on the rear side of the driving scroll 30. A movement of the rotor 11 disposed in the rotor accommodation portion 80 in the driving scroll 30 to the front side is restricted by the cover portion 37 of the bearing cover body 36, and a movement of the rotor 11 to the rear side is restricted by the shoulder portion end surface 811 of the peripheral wall shoulder portion 81. Therefore, the bearing cover body 36 and the peripheral wall shoulder portion 81 can prevent the rotor 11 from being detached from the driving scroll 30 in the front-rear direction.

[0082] In this case, since no bolt hole or the like is formed in the rotor 11 to prevent the rotor 11 from being detached, the strength of the rotor 11 is not reduced, and hence the durability of the rotor 11 is not reduced.

[0083] The first boss 38 that receives the bearing load from the needle roller bearing 72 is formed integrally with the bearing cover body 36, and the bearing cover body 36 has a greater strength than that of the driving scroll end plate 31. Therefore, the first boss 38 can bear the bearing load from the needle roller bearing 72.

[0084] Therefore, according to the compressor of the embodiment, the first boss 38 rotatably supported by the needle roller bearing 72 can bear the bearing load, and the rotor 11 can be prevented from being detached from the driving scroll 30 without reducing the durability of the rotor 11.

[0085] In addition, in this compressor, the end ring 51 made of a non-magnetic material is interposed between the rotor 11 and the bearing cover body 36. Therefore, the end ring 51 can suppress magnetic flux leakage. As a result, the bearing cover body 36 can be made of an iron-based alloy, which is advantageous in terms of cost.

[0086] Furthermore, in this compressor, the front surface 311 of the driving scroll end plate 31 and the rear surface 371 of the cover portion 37 facing the front surface 311 in the front-rear direction are in surface contact with each other. Therefore, the bearing cover body 36 is easily fixed to the driving scroll end plate 31 in an adequate posture, which is advantageous in securing that the driving axis R1 and the first boss 38 are disposed coaxially.

[0087] In this compressor, the recess 87 formed in the outer surface 86 of the driving scroll 30 and the protrusion 114 formed in the facing inner surface 113 of the rotor 11 are engaged with each other. Therefore, a torque transmission force from the rotor 11 to the driving scroll 30 can be favorably secured by recess-projection engagement.

[0088] Furthermore, since the torque transmission force from the rotor 11 to the driving scroll 30 is not ensured by press-fitting the rotor 11 and the driving scroll 30, the driving scroll 30 is not deformed due to the press-fitting allowance. In addition, since the recess 87 is provided in the thick-walled portion 85 of the driving scroll peripheral wall 32, the strength of the driving scroll peripheral wall 32 is less likely to be reduced due to the formation of the recess 87. As a result, deformation of the driving scroll 30 can be favorably suppressed.

[0089] Furthermore, the recess 87 and the protrusion 114 are disposed so as to avoid the gaps between the permanent magnets 12 disposed adjacent to each other. Therefore, disturbance of magnetic field lines caused by the formation of the recess 87 and the protrusion 114 can be suppressed.Second Embodiment

[0090] As illustrated in FIG. 3, a compressor of the second embodiment includes a bearing cover body 36A in place of the bearing cover body 36 in the compressor of the first embodiment. The bearing cover body 36A is made of a non-magnetic material. Specifically, the bearing cover body 36A is made of an iron-based alloy as non-magnetic steel having a greater strength than that of the driving scroll 30. Similarly to the bearing cover body 36 in the compressor of the first embodiment, the bearing cover body 36A includes a cover portion 37A and a first boss 38A.

[0091] Furthermore, no end ring is interposed between the rotor 11 and the bearing cover body 36A. That is, the front surface 111 of the rotor 11 is in contact with a rear surface 371 of the cover portion 37A of the bearing cover body 36A.

[0092] Thus, in this compressor, it is possible to prevent the occurrence of magnetic flux leakage through the bearing cover body 36A while omitting an end ring. As a result, as compared to the compressor of the first embodiment, the number of parts can be reduced.

[0093] The other components and operation of the compressor are the same as those of the compressor of the first embodiment, and the identical components are designated by the same reference numerals and detailed description of the components is omitted.

[0094] Although the present disclosure has been described based on the first and second embodiments, the present disclosure is not limited to the above-described first and second embodiments, and may be modified as appropriate within the gist of the present disclosure.

[0095] For example, in the compressors of the first and second embodiments, the peripheral wall shoulder portion 81 is formed in the driving scroll peripheral wall 32, and the shoulder portion end face 811 serves as the restricting portion. However, the present disclosure is not limited to this configuration, and the restricting portion may be provided by attaching a circlip or the like made of a non-magnetic material to the driving scroll peripheral wall 32.

[0096] In the compressors of the first and second embodiments, a gasket may be interposed between the front surface 311 of the driving scroll end plate 31 and the rear surface 371 of the cover portion 37.

[0097] In the compressors of the first and second embodiments, a predetermined torque transmission force from the rotor 11 to the driving scroll 30 is secured by the recess-projection engagement between the recess 87 and the protrusion 114, but the present disclosure is not limited to this. For example, the predetermined torque transmission force may be secured by press-fitting of the rotor 11 and the driving scroll 30, or using a bolt, a pin, or a key.

[0098] In the compressors of the first and second embodiments, the driven mechanism 20 is formed of the anti-rotation pins 21 and the rings 22. However, the configuration is not limited thereto, and the driven mechanism 20 may be formed of a pin-ring-pin mechanism in which two pins slide on an inner peripheral surface of one free ring, a pin-and-pin mechanism in which outer peripheral surfaces of two pins slide on each other, a mechanism using an Oldham coupling, or the like.Additional Note 1

[0099] A co-rotating scroll compressor comprising:

[0100] a housing; a driving mechanism; a driving scroll; a driven scroll; and a driven mechanism,

[0101] the driving scroll being configured to make driving rotation around a driving axis by the driving mechanism,

[0102] the driven scroll being eccentric to the driving scroll, and configured to make driven rotation around a driven axis by the driving scroll and the driven mechanism,

[0103] the driving scroll having a driving scroll end plate that extends in a direction intersecting with the driving axis, a driving scroll peripheral wall that protrudes from the driving scroll end plate toward the driven scroll in a tubular shape, and a driving scroll spiral body that protrudes in a spiral shape from the driving scroll end plate toward the driven scroll inside the driving scroll peripheral wall,

[0104] the driven scroll having a driven scroll end plate that extends in a direction intersecting with the driven axis, and a driven scroll spiral body that protrudes in a spiral shape from the driven scroll end plate toward the driving scroll, and

[0105] the driving scroll and the driven scroll forming a compression chamber with the driving scroll spiral body and the driven scroll spiral body facing with each other, and changing a volume of the compression chamber by the driving rotation and the driven rotation, wherein

[0106] a bearing cover body having a greater strength than a strength of the driving scroll end plate is fixed to an end surface of the driving scroll end plate opposite from the compression chamber on one side of the driving scroll in a direction of the driving axis, and a restricting portion is provided in the driving scroll peripheral wall on the other side of the driving scroll in the direction of the driving axis,

[0107] the bearing cover body has a supported portion that is formed integrally with the bearing cover body and rotatably supported by the housing via a bearing,

[0108] the driving mechanism includes a rotor that has a tubular shape, surrounds the driving scroll from an outer peripheral side, and is disposed on an outer peripheral surface of the driving scroll, and

[0109] a movement of the rotor to the one side in the direction of the driving axis is restricted by the bearing cover body, and a movement of the rotor to the other side in the direction of the driving axis is restricted by the restricting portion.Additional Note 2

[0110] The co-rotating scroll compressor according to Additional note 1, wherein,

[0111] the driving scroll has a rotor accommodation portion that is provided in the driving scroll end plate and the driving scroll peripheral wall and has an outer peripheral surface on which the rotor is disposed, and a peripheral wall shoulder portion that is provided in the driving scroll peripheral wall and has an outer diameter larger than an outer diameter of the rotor accommodation portion, and

[0112] the peripheral wall shoulder portion has a shoulder portion end surface facing the one side in the direction of the driving axis and forming the restricting portion.Additional Note 3

[0113] The co-rotating scroll compressor according to Additional note 1 or 2, wherein

[0114] the bearing cover body is made of a magnetic material, and

[0115] an intermediate member made of a non-magnetic material is interposed between the bearing cover body and the rotor.Additional Note 4

[0116] The co-rotating scroll compressor according to Additional note 1 or 2, wherein the bearing cover body is made of a non-magnetic material.Additional Note 5

[0117] The co-rotating scroll compressor according to any one of Additional notes 1 to 4, wherein

[0118] the end surface of the driving scroll end plate and a facing surface of the bearing cover body facing the end surface are in surface contact with each other.INDUSTRIAL APPLICABILITY

[0119] The present disclosure is applicable to the air conditioner for the vehicle, or the like.REFERENCE SIGNS LIST10 electric motor (driving mechanism)

[0121] 11 rotor

[0122] 20 driven mechanism

[0123] 30 driving scroll

[0124] 31 driving scroll end plate

[0125] 311 front surface (end surface)

[0126] 32 driving scroll peripheral wall

[0127] 33 driving scroll spiral body

[0128] 80 rotor accommodation portion

[0129] 36 bearing cover body

[0130] 37 cover portion

[0131] 371 rear surface (facing surface)

[0132] 38 first boss (supported portion)

[0133] 81 peripheral wall shoulder portion

[0134] 811 shoulder portion end surface (restricting portion)

[0135] 40 driven scroll

[0136] 41 driven scroll end plate

[0137] 42 driven scroll spiral body

[0138] 51 end ring (intermediate member)

[0139] 55 compression chamber

[0140] 60 housing

[0141] 72 needle roller bearing (bearing)

[0142] R1 driving axis

[0143] R2 driven axis

Claims

1. A co-rotating scroll compressor comprising:a housing; a driving mechanism; a driving scroll; a driven scroll; and a driven mechanism,the driving scroll being configured to make driving rotation around a driving axis by the driving mechanism,the driven scroll being eccentric to the driving scroll, and configured to make driven rotation around a driven axis by the driving scroll and the driven mechanism,the driving scroll having a driving scroll end plate that extends in a direction intersecting with the driving axis, a driving scroll peripheral wall that protrudes from the driving scroll end plate toward the driven scroll in a tubular shape, and a driving scroll spiral body that protrudes in a spiral shape from the driving scroll end plate toward the driven scroll inside the driving scroll peripheral wall,the driven scroll having a driven scroll end plate that extends in a direction intersecting with the driven axis, and a driven scroll spiral body that protrudes in a spiral shape from the driven scroll end plate toward the driving scroll, andthe driving scroll and the driven scroll forming a compression chamber with the driving scroll spiral body and the driven scroll spiral body facing with each other, and changing a volume of the compression chamber by the driving rotation and the driven rotation, whereina bearing cover body having a greater strength than a strength of the driving scroll end plate is fixed to an end surface of the driving scroll end plate opposite from the compression chamber on one side of the driving scroll in a direction of the driving axis, and a restricting portion is provided in the driving scroll peripheral wall on the other side of the driving scroll in the direction of the driving axis,the bearing cover body has a supported portion that is formed integrally with the bearing cover body and rotatably supported by the housing via a bearing,the driving mechanism includes a rotor that has a tubular shape, surrounds the driving scroll from an outer peripheral side, and is disposed on an outer peripheral surface of the driving scroll, anda movement of the rotor to the one side in the direction of the driving axis is restricted by the bearing cover body, and a movement of the rotor to the other side in the direction of the driving axis is restricted by the restricting portion.

2. The co-rotating scroll compressor according to claim 1, whereinthe driving scroll has a rotor accommodation portion that is provided in the driving scroll end plate and the driving scroll peripheral wall and has an outer peripheral surface on which the rotor is disposed, and a peripheral wall shoulder portion that is provided in the driving scroll peripheral wall and has an outer diameter larger than an outer diameter of the rotor accommodation portion, andthe peripheral wall shoulder portion has a shoulder portion end surface facing the one side in the direction of the driving axis and forming the restricting portion.

3. The co-rotating scroll compressor according to claim 1, whereinthe bearing cover body is made of a magnetic material, andan intermediate member made of a non-magnetic material is interposed between the bearing cover body and the rotor.

4. The co-rotating scroll compressor according to claim 1, whereinthe bearing cover body is made of a non-magnetic material.

5. The co-rotating scroll compressor according to claim 1, whereinthe end surface of the driving scroll end plate and a facing surface of the bearing cover body facing the end surface are in surface contact with each other.

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