Dual rotation scroll compressor

Abstract

A bearing cover (36) having a higher strength than the drive end plate (31) is affixed to one side of the drive scroll (30) in the direction of the drive axis (R1) and to the end surface (311) of the drive end plate (31) on the opposite side from the compression chamber (55), and a restriction section (811) is provided to the drive peripheral wall (32) on the other side of the drive scroll (30) in the direction of the drive axis (R1). The bearing cover body (36) is integrally provided with a supported part (38). The drive mechanism (10) has a rotor (11) that surrounds the drive scroll (30) from the outer peripheral side and is disposed on the outer peripheral surface of the drive scroll (30). The movement of the rotor (11) toward one side in the direction of the drive axis (R1) is restricted by the bearing cover (36), and the movement of the rotor (11) toward the other side in the direction of the drive axis (R1) is restricted by the restriction section (811).

Description

Technical Field

[0001] The present invention relates to a twin-rotary scroll compressor. Background Art

[0002] A conventional twin-rotating scroll compressor is disclosed in Patent Document 1. The twin-rotating scroll compressor includes a driving mechanism, a driving scroll, a driven mechanism, a driven scroll, and a casing.

[0003] The driving scroll is driven to rotate about a driving axis by a driving mechanism, and the driven scroll is driven to rotate about a driven axis by the driving scroll and the driven mechanism while being eccentric with respect to the driving scroll.

[0004] The driving scroll comprises a driving end plate, a driving peripheral wall, and a driving scroll body. The driving end plate extends in a direction intersecting the driving axis. The driving peripheral wall projects cylindrically from the driving end plate toward the driven scroll. The driving scroll body spirally projects from the driving end plate toward the driven scroll within the driving peripheral wall.

[0005] The driven scroll includes a driven end plate and a driven scroll body. The driven end plate extends in a direction intersecting the driven axis. The driven scroll body spirally protrudes from the driven end plate toward the driving scroll.

[0006] The driving scroll and the driven scroll form a compression chamber when the driving scroll body and the driven scroll body face each other. The volume of the compression chamber changes due to rotational driving and rotational following.

[0007] A supported portion rotatably supported relative to the housing via a bearing is integrally formed on the back side of the compression chamber in the driving end plate and the driven end plate.

[0008] The drive mechanism includes a rotor that has a cylindrical shape and surrounds the driving scroll from the outer peripheral side and is fixed to the driving scroll.

[0009] Prior art literature

[0010] Patent Literature

[0011] Patent Document 1: Japanese Patent Application Laid-Open No. 2002-310073 Summary of the Invention

[0012] Problems to be solved by the invention

[0013] However, in the conventional twin-rotating scroll compressor, the rotor must be secured relative to the driving scroll in the drive axis direction. If bolts are used to prevent the rotor from falling out, the formation of bolt holes reduces the rotor's strength, potentially reducing the rotor's durability.

[0014] On the one hand, from the perspective of weight reduction, for example, the driving scroll may be made of aluminum alloy. In this case, the supported portion integrally provided on the driving end plate and rotatably supported by the bearing may not be strong enough to withstand the bearing load.

[0015] The present invention has been completed in view of the above-mentioned actual situation in the past. The problem to be solved is to provide a twin-rotating scroll compressor in which the supported portion supported by the bearing so as to be able to rotate can withstand the bearing load and can prevent the rotor from falling off relative to the driving scroll without reducing the durability of the rotor.

[0016] Means for solving problems

[0017] The twin-rotating scroll compressor of the present invention comprises a housing, a driving mechanism, a driving scroll, a driven scroll, and a driven mechanism.

[0018] The driving scroll is driven to rotate around the driving axis by the driving mechanism.

[0019] The driven scroll is eccentric with respect to the driving scroll and is driven to rotate about a driven axis by the driving scroll and the driven mechanism.

[0020] The driving scroll comprises: a driving end plate extending in a direction intersecting the driving axis; a driving peripheral wall protruding in a cylindrical shape from the driving end plate toward the driven scroll; and a driving scroll body protruding in a spiral shape from the driving end plate toward the driven scroll within the driving peripheral wall.

[0021] The driven scroll includes: a driven end plate extending in a direction intersecting the driven axis; and a driven scroll body protruding in a spiral shape from the driven end plate toward the driving scroll.

[0022] The driving scroll and the driven scroll are opposed to each other to form a compression chamber, and the volume of the compression chamber changes due to the rotational driving and the rotational following.

[0023] The twin-rotary scroll compressor is characterized in that:

[0024] A bearing cover having a higher strength than that of the driving end plate is fixed to an end surface of the driving end plate on the side opposite to the compression chamber on one side of the driving scroll in the driving axial direction, and a restriction portion is provided on the driving peripheral wall on the other side of the driving scroll in the driving axial direction.

[0025] The bearing cover integrally includes a supported portion rotatably supported by the housing via a bearing.

[0026] The driving mechanism includes a rotor having a cylindrical shape and surrounding the driving scroll from the outer peripheral side and arranged on the outer peripheral surface of the driving scroll.

[0027] The movement of the rotor to the one side in the drive shaft center direction is restricted by the bearing cover, and the movement of the rotor to the other side in the drive shaft center direction is restricted by the restriction portion.

[0028] In the twin-rotating scroll compressor of the present invention, a bearing cover is fixed to the end surface of the driving end plate, on the side opposite to the compression chamber, on one side of the driving scroll in the drive axis direction. Furthermore, a restricting portion is provided on the driving peripheral wall on the other side of the driving scroll in the drive axis direction. Furthermore, the movement of the rotor, which is arranged on the outer peripheral surface of the driving scroll, toward one side of the drive axis direction is restricted by the bearing cover, while movement toward the other side of the drive axis direction is restricted by the restricting portion. Therefore, the bearing cover and the restricting portion prevent the rotor from separating from the driving scroll in the drive axis direction.

[0029] In this case, the strength of the rotor is not reduced due to the formation of the bolt holes, and the durability of the rotor is not reduced.

[0030] In this twin-rotating scroll compressor, the supported portion rotatably supported by the housing via the bearing is provided on a bearing cover having a higher strength than the driving end plate.

[0031] Therefore, according to the twin-rotating scroll compressor of the present invention, the supported portion rotatably supported by the bearing can bear the bearing load, and the rotor can be prevented from coming off the driving scroll without reducing the durability of the rotor.

[0032] The driving scroll preferably includes a rotor housing portion provided between the driving end plate and the driving peripheral wall, with the rotor disposed on its outer peripheral surface; and a peripheral wall shoulder portion provided on the driving peripheral wall and having an outer diameter larger than that of the rotor housing portion. Furthermore, the shoulder end surface of the peripheral wall shoulder portion, which faces the driving axis, preferably forms a restricting portion.

[0033] In this case, the movement of the rotor disposed in the rotor housing toward one side in the drive axis direction is restricted by the bearing cover, and the movement of the rotor toward the other side in the drive axis direction is restricted by the shoulder end surface of the peripheral wall shoulder.

[0034] Preferably, the bearing cover is made of a magnetic body, and an intermediate member made of a non-magnetic body is interposed between the bearing cover and the rotor.

[0035] In this case, even if the bearing cover is formed of a low-cost magnetic body, the occurrence of magnetic flux leakage through the bearing cover can be suppressed by the intermediate member.

[0036] Preferably, the bearing cover is made of a non-magnetic body.

[0037] In this case, it is possible to prevent the occurrence of magnetic flux leakage via the bearing cover.

[0038] Preferably, an end surface of the driving end plate on the side opposite to the compression chamber is in surface contact with an opposing surface of the bearing cover facing the end surface.

[0039] In this case, it is advantageous to fix the bearing cover in a correct posture relative to the driving end plate, and it is advantageous to ensure the coaxiality between the driving axis and the supported portion.

[0040] Effects of the Invention

[0041] According to the twin-rotating scroll compressor of the present invention, the supported portion rotatably supported by the bearing can bear the bearing load, and the rotor can be prevented from coming off the driving scroll without reducing the durability of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a cross-sectional view of the twin-rotary scroll compressor of Example 1.

[0043] Figure 2 The twin-rotating scroll compressor of embodiment 1 is Figure 1 AA line section view.

[0044] Figure 3 It is a cross-sectional view of a twin-rotary scroll compressor according to the second embodiment. DETAILED DESCRIPTION

[0045] Hereinafter, embodiments 1 and 2 which embody the present invention will be described with reference to the accompanying drawings.

[0046] (Example 1)

[0047] like Figure 1 As shown, a twin-rotating scroll compressor (hereinafter referred to as a compressor) according to Embodiment 1 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 "drive mechanism" according to the present invention. This compressor is mounted on a vehicle (not shown) and constitutes a vehicle air conditioning system.

[0048] In this embodiment, using Figure 1 The solid arrows shown define the front-rear direction of the compressor. Note that the front-rear direction is an example for convenience of explanation, and the compressor can change its posture appropriately depending on the vehicle on which it is installed.

[0049] The housing 60 consists of a housing body 61 and a cover 65. The housing body 61 is a bottomed cylindrical member having an outer peripheral wall 62 and a bottom wall 63. The outer peripheral wall 62 is cylindrical, centered on the drive axis R1, and has an inner peripheral surface 62B. The drive axis R1 is parallel to the front-to-back direction. In the following description, the front direction refers to one direction of the drive axis R1, and the rear direction refers to the other direction of the drive axis R1.

[0050] The bottom wall 63 is located at the rear end of the housing body 61. It extends orthogonally to the drive axis R1 and has a generally circular, flat plate-like shape. The outer peripheral edge of the bottom wall 63 is connected to the rear end of the outer peripheral wall 62. A cylindrical second shaft support 64 protrudes from the center of the inner surface of the bottom wall 63, projecting forward with the driven axis R2 as its center. The driven axis R2 is eccentric relative to the drive axis R1 while extending parallel to it. The inner ring of the bearing 71 is fitted onto the exterior of the second shaft support 64.

[0051] It should be noted that an inverter housing provided with a connector portion is coupled to the rear of the housing body 61. An inverter circuit having a circuit substrate and switching elements, etc., is housed in the inverter housing. The inverter circuit is electrically connected to the battery of the vehicle via a connector, and is electrically connected to the stator 17 described later via an airtight passage provided in the bottom wall 63. Thus, the inverter circuit converts the DC current supplied from the battery into AC current while supplying power to the stator 17. It should be noted that the illustration of the airtight passage, the connector portion, the inverter housing, the inverter circuit, and the battery is omitted.

[0052] The cover 65 is positioned in front of the housing body 61. The cover 65 extends perpendicular to the drive axis R1 and has a generally circular, flat plate shape. The cover 65 is secured to the outer peripheral wall 62 of the housing body 61 by bolts (not shown), with its outer peripheral edge abutting the front end. This seals the housing body 61 from the front. This creates a suction chamber 61A within the housing body 61.

[0053] A cylindrical first shaft support 66 centered on the drive axis R1 is provided protrudingly at the center of the inner surface of the cover 65. The outer ring of a needle roller bearing 72 is fitted into the first shaft support 66. The needle roller bearing 72 is an example of a "bearing" in the present invention.

[0054] The cover 65 is formed with an intake communication port 65A and an exhaust communication port 65B. The intake communication port 65A is located between the outer peripheral edge of the cover 65 and the first shaft support portion 66 and penetrates the cover 65 in a direction parallel to the drive axis R1. The intake communication port 65A connects the suction chamber 61A with the outside of the compressor. A pipe is connected to the intake communication port 65A. As a result, the low-temperature and low-pressure refrigerant gas that has passed through the evaporator is sucked into the suction chamber 61A through the pipe.

[0055] The discharge communication port 65B is located at the center of the cover 65 and extends through the cover 65 in a direction parallel to the drive axis R1, opening into the first shaft support portion 66. A pipe (not shown) is connected to the discharge communication port 65B, and the discharge communication port 65B allows the refrigerant gas discharged to the discharge portion 38B, described later, to flow toward the condenser. It should be noted that the piping, evaporator, and condenser are not shown in the figure.

[0056] The electric motor 10 is housed in the suction chamber 61A. Thus, the suction chamber 61A also serves as a motor chamber for housing the electric motor 10. The electric motor 10 is composed of a stator 17 and a rotor 11.

[0057] The stator 17 is cylindrical centered on the drive axis R1 and includes a winding 18. The stator 17 is fixed to the housing body 61 and further to the housing 60 by fitting into the inner peripheral surface 62B of the outer peripheral wall 62 of the housing body 61.

[0058] The rotor 11 is cylindrical around the drive axis R1 and is disposed within the stator 17. The center O of the rotor 11 coincides with the drive axis R1. The rotor 11 has a front surface 111 and a rear surface 112 located opposite the front surface 111. Although not shown in detail, the rotor 11 is composed of a plurality of permanent magnets 12 corresponding to the stator 17 and laminated steel plates to which the permanent magnets 12 are fixed. Figure 2 As shown, the plurality of permanent magnets 12 are arranged at equal intervals along the circumferential direction of the driven scroll 30 .

[0059] The driving scroll 30 includes a driving end plate 31, a driving peripheral wall 32, and a driving scroll body 33. The driving end plate 31, the driving peripheral wall 32, and the driving scroll 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.

[0060] The driving end plate 31 extends orthogonally to the driving axis R1 and has a generally circular plate shape. The driving end plate 31 has a front surface 311 and a rear surface 312 located opposite the front surface 311. The front surface 311 corresponds to the "end surface of the driving end plate opposite the compression chamber" in the present invention.

[0061] A discharge valve chamber 34 is formed on the front surface 311 of the driving end plate 31. The discharge valve chamber 34 is formed by a recessed portion of the front surface 311 that is partially recessed toward the compression chamber 55 described later. The discharge valve chamber 34 has an inner surface shape that roughly corresponds to the outer shape of the discharge valve mechanism 56 so as to be able to accommodate the discharge valve mechanism 56 described later. In addition, a discharge port 35 is formed near the center of the driving end plate 31, penetrating the driving end plate 31 in the front-to-back direction. The discharge port 35 connects the compression chamber 55 with the discharge valve chamber 34.

[0062] A discharge valve mechanism 56 is disposed within 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 retainer 58 are fixed to the bottom surface of the discharge valve chamber 34 by the fixing bolt 59. The discharge reed valve 57 can open and close the discharge port 35. Furthermore, the retainer 58 can adjust the opening of the discharge reed valve 57.

[0063] The driving scroll 33 is located inside the driving peripheral wall 32. The driving scroll 33 extends from the rear surface 312 of the driving end plate 31 toward the rear and parallel to the driving axis R1. The driving scroll 33 is formed based on an involute curve and spirals around the driving axis R1. Figure 2 As shown in FIG. 1 , when viewed from the rear, the driving scroll body 33 is formed to be counterclockwise wound around the driving axis R1 from the vortex center. The end portion of the outer peripheral side of the driving scroll body 33 is connected to the driving peripheral wall 32. It should be noted that, in Figure 2 In the figure, the discharge port 35 which should be visible from the rear is omitted.

[0064] The driving peripheral wall 32 extends from the outer peripheral edge of the driving end plate 31 toward the rear, that is, toward the driven scroll 40, in parallel with the driving axis R1. The driving peripheral wall 32 has a substantially cylindrical shape centered on the driving axis R1.

[0065] A bearing cover 36 is fixed to the front surface 311 of the driving end plate 31 in front of the driven scroll 30 . The bearing cover 36 is made of a magnetic material. Specifically, the bearing cover 36 is made of an iron-based alloy having a higher strength than the driven scroll 30 .

[0066] The bearing cover 36 includes 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 invention.

[0067] The cover portion 37 extends in a substantially disk-like shape perpendicular to the drive axis R1 . A through hole 37B is formed in the center of the cover portion 37 .

[0068] The first boss 38 protrudes forward from the inner periphery of the cover portion 37, that is, from the center of the cover portion 37. The first boss 38 extends cylindrically in the direction of the drive axis R1, centered about the drive axis R1. The cylindrical interior space of the first boss 38 constitutes the discharge portion 38B. It should be noted that in this compressor, the discharge valve chamber 34 and the discharge portion 38B constitute the discharge chamber.

[0069] The cover portion 37 of the bearing cover 36 and the driving end plate 31 of the driving scroll 30 are fastened together by a plurality of bolts 50 extending parallel to the drive axis R1. When fastened together by these bolts 50, the front surface 311 of the driving end plate 31 is in surface contact with the rear surface 371 of the cover portion 37, which faces the front surface 311 in the front-to-back direction. The rear surface 371 of the cover portion 37 corresponds to the "opposing surface" of the present invention.

[0070] The driven scroll 40 includes a driven end plate 41 and a driven scroll body 42. The driven end plate 41 and the driven scroll body 42 are formed integrally. The driven scroll 40 is made of a non-magnetic material. Specifically, the driven scroll 40 is made of an aluminum alloy.

[0071] The driven end plate 41 extends orthogonally to the driven axis R2 and has a generally circular plate shape. The driven end plate 41 has a front surface 411 and a rear surface 412 located opposite the front surface 411. A second boss 43 is formed in the center of the rear surface 412, projecting toward the bottom wall 63. The second boss 43 has a cylindrical shape centered on the driven axis R2.

[0072] The driven end plate 41 is provided with a suction port 44. The suction port 44 penetrates the driven end plate 41 in the driven axis R2 direction, ie, in the front-rear direction, at a position closer to the outer periphery than the second boss 43.

[0073] The driven scroll body 42 extends forward from the front surface 411 of the driven end plate 41 in parallel with the driven axis R2. The driven scroll body 42 is formed based on an involute curve and spirals around the driven axis R2. More specifically, Figure 2 As shown, the driven scroll body 42 is formed to be counterclockwise wound around the driven axis R2 starting from the scroll center when viewed from the rear.

[0074] The driven mechanism 20 is composed of four rotation preventing pins 21 and four rings 22. It should be noted that the number of the rotation preventing pins 21 and rings 22 can be appropriately designed as long as there are three or more of each. Figure 1 In the figure, two of each of the rotation preventing pins 21 and the rings 22 are shown. The driving scroll 30 and the driven scroll 40 form a compression chamber 55 by having the driving scroll body 33 and the driven scroll body 42 facing each other.

[0075] Each of the rotation preventing pins 21 is fixed to the rear surface of a peripheral wall shoulder portion 81 (described later) of the driving scroll 30. Each of the rings 22 is fixed to the front surface 411 of the driven end plate 41 so as to face the respective rotation preventing pins 21.

[0076] In the compressor of this embodiment 1, a rotor housing portion 80 is provided on the outer peripheral surfaces of the driving end plate 31 and the driving peripheral wall 32. The rotor housing portion 80 is provided so as to extend from the front surface 311 of the driving end plate 31 toward the rear and reach the driving peripheral wall 32. The outer peripheral surface of the rotor housing portion 80 is in a cylindrical shape corresponding to the inner peripheral surface of the rotor 11. The rotor 11 is arranged on the outer peripheral surface of the rotor housing portion 80. The outer diameter of the rotor housing portion 80 is slightly smaller than the inner diameter of the rotor 11. That is, the fit between the rotor 11 and the rotor housing portion 80 is a clearance fit. In this way, the rotor 11 is arranged on the outer peripheral surface of the driving scroll 30 while surrounding the driving scroll 30 from the outer peripheral side.

[0077] Furthermore, an annular peripheral wall shoulder 81 is provided on the outer peripheral surface of the rear end portion of the driving peripheral wall 32. The peripheral wall shoulder 81 is provided behind the rotor housing portion 80 and is continuous with the rotor housing portion 80. The outer diameter of the peripheral wall shoulder 81 is larger than the outer diameter of the rotor housing portion 80. Specifically, the outer diameter of the peripheral wall shoulder 81 is larger than the outer diameter of the rotor housing portion 80 by an amount corresponding to the radial thickness of the rotor 11. The front surface of the peripheral wall shoulder 81, that is, the shoulder end surface 811 of the peripheral wall shoulder 81 facing forward, abuts the rear surface 112 of the rotor 11. The shoulder end surface 811 is an example of a "restriction portion" of the present invention.

[0078] like Figure 2 As shown, the driving scroll 30 has a first region S and a second region outside the first region S on its outer peripheral surface in the circumferential direction of the driving scroll 30. The first region S includes the connection portion 82 where the outer peripheral end of the driving scroll 33 is connected to the driving peripheral wall 32. The first region S also includes a portion of the driving peripheral wall 32. The second region includes the driving peripheral wall 32 outside the first region S.

[0079] The driving peripheral wall 32 in the first region S forms a thick portion 85 in which a first inner surface 83 facing radially inward of the driving scroll 30 is located radially inward of a second inner surface 84 facing radially inward of the driving peripheral wall 32 in the second region.

[0080] Furthermore, the first inner surface 83 of the driving peripheral wall 32 in the first region S is formed along an involute curve obtained by extending the involute curve described by the inner side surface 331 of the driving scroll 33 as is. In other words, the involute curve obtained by extending the involute curve described by the inner side surface 331 of the driving scroll 33 as is coincides with the involute curve described by the first inner surface 83 of the driving peripheral wall 32 in the first region S. This involute curve extends throughout the entire first region S, but the winding end of the involute curve does not extend into the second region.

[0081] A recess 87 is formed on the radially outward outer surface 86 of the orbiting scroll 30 in the first region S. A projection 114 that engages with the recess 87 is formed on an opposing inner surface 113 of the rotor 11 that radially opposes the outer surface 86 of the orbiting scroll 30 .

[0082] The recessed portion 87 and the convex portion 114 extend in the front-to-back direction with a substantially rectangular cross-sectional shape. They extend from the front surface 311 of the drive end plate 31 to the shoulder end surface 811 of the peripheral wall shoulder 81. Furthermore, the recessed portion 87 and the convex portion 114 are disposed so as to face one of the permanent magnets 12 in the radial direction of the driven scroll 30. Specifically, the recessed portion 87 and the convex portion 114 are disposed so as to avoid gaps between adjacent permanent magnets 12.

[0083] An end ring 51 is positioned in front of the rotor 11 in the rotor housing 80. This end ring 51 is an example of an "intermediate member" in the present invention. It is made of a non-magnetic material. Specifically, it is made of an aluminum alloy. It is sandwiched between the bearing cover 36 and the rotor 11, and is held between the rear surface 371 of the cover 37 and the front surface 111 of the rotor 11.

[0084] In the compressor constructed as described above, the electric motor 10 is operated by controlling the operation of the electric motor 10 while power is supplied to the stator 17 by an inverter circuit (not shown). This causes the rotor 11 to rotate, thereby rotating the driving scroll 30 about the drive axis R1 within the suction chamber 61A. Specifically, the driving scroll 30, which is integrally incorporated with the rotor 11, is rotated. At this time, in the driven mechanism 20, each anti-rotation pin 21 is in sliding contact with the inner circumferential surface of each ring 22, causing each ring 22 to rotate relative to the center of the respective anti-rotation pin 21. In this way, the driven mechanism 20 transmits the torque of the driving scroll 30 to the driven scroll 40.

[0085] As a result, the driven scroll 40 is driven in rotation about the driven axis R2 by the driving scroll 30 and the driven mechanism 20. At this time, the driven mechanism 20 restricts the rotation of the driven scroll 40. Thus, the driven scroll 40 orbits relative to the driving scroll 30 about the drive axis R1, driven by the rotation of the driving scroll 30 and the driven scroll 40, thereby changing the volume of the compression chamber 55.

[0086] Therefore, the refrigerant in the suction chamber 61A is drawn into the compression chamber 55 through the suction port 44 and compressed by the compression chamber 55. The refrigerant, compressed to the discharge pressure by the compression chamber 55, is then discharged from the discharge port 35 into the discharge valve chamber 34, and then through the discharge portion 38B and the discharge communication port 65B to the condenser. In this manner, air conditioning is performed by the vehicle air conditioning system.

[0087] In this compressor, a bearing cover 36 is fixed to the front surface 311 of the driving end plate 31 on the front side of the driven scroll 30, and a peripheral wall shoulder 81 is provided on the driving peripheral wall 32 on the rear side of the driven scroll 30. Furthermore, the forward movement of the rotor 11, which is disposed in the rotor housing 80 of the driven scroll 30, is restricted by the cover portion 37 of the bearing cover 36, while the rearward movement of the rotor 11 is restricted by the shoulder end surface 811 of the peripheral wall shoulder 81. Therefore, the bearing cover 36 and the peripheral wall shoulder 81 prevent the rotor 11 from separating from the driven scroll 30 in the front-to-rear direction.

[0088] In this case, since bolt holes or the like are not formed in the rotor 11 for preventing the rotor 11 from coming off, the strength of the rotor 11 is not reduced, and consequently, the durability of the rotor 11 is not reduced.

[0089] Furthermore, the first boss 38 receiving the bearing load from the needle bearing 72 is integrally provided with the bearing cover 36 , which is stronger than the driving end plate 31 . Therefore, the first boss 38 can receive the bearing load from the needle bearing 72 .

[0090] Therefore, according to the compressor of the embodiment, the first boss 38 rotatably supported by the needle bearing 72 can bear the bearing load and prevent the rotor 11 from coming off the driving scroll 30 without reducing the durability of the rotor 11 .

[0091] Furthermore, in this compressor, a non-magnetic end ring 51 is interposed between the rotor 11 and the bearing cover 36. Therefore, magnetic flux leakage can be suppressed by the end ring 51. Consequently, the bearing cover 36 can be made of a cost-effective iron-based alloy.

[0092] Furthermore, in this compressor, the front surface 311 of the drive end plate 31 is in surface contact with the rear surface 371 of the cover portion 37, which is opposed to the front surface 311 in the front-to-back direction. Therefore, it is easy to secure the bearing cover 36 to the drive end plate 31 in an appropriate posture, and this helps ensure the coaxiality between the drive axis R1 and the first boss 38.

[0093] In this compressor, the recessed portion 87 formed on the outer surface 86 of the driving scroll 30 engages with the convex portion 114 formed on the opposing inner surface 113 of the rotor 11. Therefore, the torque transmission force from the rotor 11 to the driving scroll 30 can be well ensured by the recessed and convex engagement.

[0094] Furthermore, since torque transmission from the rotor 11 to the driven scroll 30 is not ensured by press-fitting the rotor 11 and the driven scroll 30, deformation of the driven scroll 30 due to the amount of press-fitting is also avoided. Furthermore, since the recess 87 is provided in the thick-walled portion 85 of the driving peripheral wall 32, the impact of the reduction in strength of the driving peripheral wall 32 due to the formation of the recess 87 is minimized. As a result, deformation of the driving scroll 30 can be effectively suppressed.

[0095] Furthermore, the recessed portions 87 and the convex portions 114 are arranged so as to avoid gaps between adjacent permanent magnets 12. Therefore, disturbance of magnetic field lines due to the formation of the recessed portions 87 and the convex portions 114 can be suppressed.

[0096] (Example 2)

[0097] like Figure 3 As shown, in the compressor of Example 2, a bearing cover 36A replaces the bearing cover 36 of the compressor of Example 1. This bearing cover 36A is made of a non-magnetic material. Specifically, the bearing cover 36A is made of an iron-based alloy, which is a non-magnetic steel with higher strength than the driven scroll 30. Similar to the bearing cover 36 of the compressor of Example 1, this bearing cover 36A has a cover portion 37A and a first boss 38A.

[0098] Furthermore, no end ring is interposed between the rotor 11 and the bearing cover 36A. That is, the front surface 111 of the rotor 11 abuts against the rear surface 371 of the cover portion 37A of the bearing cover 36A.

[0099] Therefore, in this compressor, it is possible to omit the end ring and prevent the occurrence of magnetic flux leakage via the bearing cover 36A. As a result, the number of components can be reduced compared to the compressor of Example 1.

[0100] The other structures and functions of this compressor are the same as those of the compressor of Example 1. The same reference numerals are given to the same structures and detailed descriptions of the structures are omitted.

[0101] As mentioned above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the first and second embodiments, and can be applied with appropriate modifications within the scope of the present invention.

[0102] For example, in the compressors of Examples 1 and 2, a peripheral wall shoulder is formed on the driving peripheral wall, and the end surface of the shoulder constitutes the restricting portion. However, the invention is not limited thereto, and the restricting portion may also be constituted by attaching a circlip made of a non-magnetic material to the driving peripheral wall.

[0103] In the compressors of Examples 1 and 2, a gasket may be interposed between the front surface 311 of the driving end plate 31 and the rear surface 371 of the cover portion 37 .

[0104] In the compressors of Examples 1 and 2, the predetermined torque transmission force from the rotor 11 to the driven scroll 30 is ensured by the concave-convex engagement between the concave portion 87 and the convex portion 114. However, the present invention is not limited to this. For example, the predetermined torque transmission force may be ensured by press-fitting the rotor 11 and the driven scroll 30 or by using bolts, pins, or keys.

[0105] In the compressors of Examples 1 and 2, the driven mechanism 20 is composed of a rotation preventing pin 21 and a ring 22. However, the invention is not limited thereto, and the driven mechanism 20 may also be composed of a pin-ring-pin system in which two pins are in sliding contact with the inner circumference of a free ring, a pin-pin system in which the outer circumferences of two pins are in sliding contact with each other, or a system using an Oldham coupling.

[0106] (Note 1)

[0107] A twin-rotating scroll compressor includes a housing, a driving mechanism, a driving scroll, a driven scroll, and a driven mechanism.

[0108] The driving scroll is driven to rotate around the driving axis by the driving mechanism.

[0109] The driven scroll is eccentric with respect to the driving scroll and is driven to rotate about a driven axis by the driving scroll and the driven mechanism.

[0110] The driving scroll comprises: a driving end plate extending in a direction intersecting the driving axis; a driving peripheral wall protruding in a cylindrical shape from the driving end plate toward the driven scroll; and a driving scroll body protruding in a spiral shape from the driving end plate toward the driven scroll within the driving peripheral wall.

[0111] The driven scroll includes: a driven end plate extending in a direction intersecting the driven axis; and a driven scroll body protruding in a spiral shape from the driven end plate toward the driving scroll.

[0112] The driving scroll and the driven scroll are opposed to each other to form a compression chamber, and the volume of the compression chamber changes due to the rotational driving and the rotational following.

[0113] The twin-rotary scroll compressor is characterized in that:

[0114] A bearing cover having a higher strength than that of the driving end plate is fixed to an end surface of the driving end plate on the side opposite to the compression chamber on one side of the driving scroll in the driving axial direction, and a restriction portion is provided on the driving peripheral wall on the other side of the driving scroll in the driving axial direction.

[0115] The bearing cover integrally includes a supported portion rotatably supported by the housing via a bearing.

[0116] The driving mechanism includes a rotor having a cylindrical shape and surrounding the driving scroll from the outer peripheral side and arranged on the outer peripheral surface of the driving scroll.

[0117] The movement of the rotor to the one side in the drive shaft center direction is restricted by the bearing cover, and the movement of the rotor to the other side in the drive shaft center direction is restricted by the restriction portion.

[0118] (Note 2)

[0119] The twin-rotating scroll compressor according to Supplementary Note 1, wherein:

[0120] The driving scroll comprises: a rotor housing portion provided on the driving end plate and the driving peripheral wall, and having the rotor arranged on its outer peripheral surface; and a peripheral wall shoulder portion provided on the driving peripheral wall and having an outer diameter larger than that of the rotor housing portion.

[0121] The shoulder end surface of the peripheral wall shoulder facing the one side of the driving axis direction constitutes the restriction portion

[0122] (Note 3)

[0123] The twin-rotating scroll compressor according to Supplementary Note 1 or 2, wherein:

[0124] The bearing cover is made of a magnetic body.

[0125] An intermediate member made of a non-magnetic material is interposed between the bearing cover and the rotor.

[0126] (Note 4)

[0127] The twin-rotating scroll compressor according to Supplementary Note 1 or 2, wherein:

[0128] The bearing cover is made of a non-magnetic body.

[0129] (Note 5)

[0130] The twin-rotary scroll compressor according to any one of Supplementary Notes 1 to 4, wherein:

[0131] The end surface of the driving end plate is in surface contact with an opposing surface of the bearing cover that faces the end surface.

[0132] Industrial applicability

[0133] The present invention can be utilized in a vehicle air conditioner or the like.

[0134] Description of Reference Numerals

[0135] 10 Electric motor (drive mechanism)

[0136] 11 rotor

[0137] 20 Follower mechanism

[0138] 30 Drive scroll

[0139] 31 Drive end plate

[0140] 311 front surface (end face)

[0141] 32 Drive wall

[0142] 33 driving scroll

[0143] 80 rotor housing

[0144] 36 bearing cover

[0145] 37 hood

[0146] 371 rear surface (opposing surface)

[0147] 38 First boss (supported portion)

[0148] 81 peripheral wall shoulder

[0149] 811 shoulder end face (restriction part)

[0150] 40 driven scroll

[0151] 41 Driven end plate

[0152] 42 driven scroll

[0153] 51 End ring (intermediate component)

[0154] 55 Compression Chamber

[0155] 60 shell

[0156] 72 needle roller bearings (bearings)

[0157] R1 drive shaft

[0158] R2 driven axis.

Claims

1. A twin-rotating scroll compressor comprising a housing, a drive mechanism, a driving scroll, a driven scroll, and a driven mechanism. The driving scroll is driven to rotate around the driving axis by the driving mechanism. The driven scroll is eccentric with respect to the driving scroll and is driven to rotate about a driven axis by the driving scroll and the driven mechanism. The driving scroll comprises: a driving end plate extending in a direction intersecting the driving axis; a driving peripheral wall protruding in a cylindrical shape from the driving end plate toward the driven scroll; and a driving scroll body protruding in a spiral shape from the driving end plate toward the driven scroll within the driving peripheral wall. The driven scroll includes: a driven end plate extending in a direction intersecting the driven axis; and a driven scroll body protruding in a spiral shape from the driven end plate toward the driving scroll. The driving scroll and the driven scroll are opposed to each other to form a compression chamber, and the volume of the compression chamber changes due to the rotational driving and the rotational following. The twin-rotary scroll compressor is characterized in that: A bearing cover having a higher strength than that of the driving end plate is fixed to an end surface of the driving end plate on the side opposite to the compression chamber on one side of the driving scroll in the driving axial direction, and a restriction portion is provided on the driving peripheral wall on the other side of the driving scroll in the driving axial direction. The bearing cover integrally includes a supported portion rotatably supported by the housing via a bearing. The driving mechanism includes a rotor having a cylindrical shape and surrounding the driving scroll from the outer peripheral side and arranged on the outer peripheral surface of the driving scroll. The movement of the rotor to the one side in the drive shaft center direction is restricted by the bearing cover, and the movement of the rotor to the other side in the drive shaft center direction is restricted by the restriction portion.

2. The twin-rotary scroll compressor according to claim 1, wherein: The driving scroll comprises: a rotor housing portion provided on the driving end plate and the driving peripheral wall, and having the rotor arranged on its outer peripheral surface; and a peripheral wall shoulder portion provided on the driving peripheral wall and having an outer diameter larger than that of the rotor housing portion. The shoulder end surface of the peripheral wall shoulder portion, which faces the one side in the driving axis direction, constitutes the restricting portion.

3. The twin-rotary scroll compressor according to claim 1 or 2, wherein: The bearing cover is made of a magnetic body. An intermediate member made of a non-magnetic material is interposed between the bearing cover and the rotor.

4. The twin-rotary scroll compressor according to claim 1 or 2, wherein: The bearing cover is made of a non-magnetic body.

5. The twin-rotary scroll compressor according to claim 1 or 2, wherein: The end surface of the driving end plate is in surface contact with an opposing surface of the bearing cover that faces the end surface.

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