CO-ROTATING SCROLL COMPRESSOR

Abstract

A co-rotating scroll compressor includes a driving mechanism including a rotor disposed on an outer peripheral surface of a driving scroll. The driving scroll has, in the outer peripheral surface, a first region including a connection portion where an end of a driving scroll spiral body is connected to a driving scroll peripheral wall and a portion of the driving scroll peripheral wall, and a second region including a portion of the driving scroll peripheral wall other than the first region. The driving scroll peripheral wall in the first region corresponds to a thick-walled portion where a first inner surface facing inward in a radial direction of the driving scroll is positioned more inward than a second inner surface facing inward in the radial direction. A torque transmission mechanism is provided in the first region and in a portion of the rotor corresponding to the first region.

Description

TECHNICAL FIELD

The present invention relates to a co-rotating scroll compressor.

BACKGROUND ART

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.

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.

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.

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.

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

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 LIST

Patent Literature

Patent Literature 1: Japanese Patent Application Publication No. 2002-310073

SUMMARY OF THE INVENTION

Technical Problem

In the above-mentioned conventional co-rotating scroll compressor, it is necessary to secure a predetermined torque transmission force from the rotor to the driving scroll. However, in the above-mentioned co-rotating scroll compressor, the driving scroll is fitted inside the rotor, so that it is necessary to set a press-fitting allowance large so as to secure the predetermined torque transmission force.

If it is attempted that the torque transmission force is secured by the press-fitting allowance between the rotor and the driving scroll in this way, there is a risk that the driving scroll will be deformed.

The present invention is made in view of the above-mentioned conventional circumstances, and is directed to providing a co-rotating scroll compressor that can secure a torque transmission force from a rotor to a driving scroll while suppressing deformation of the driving scroll.

Solution to Problem

A co-rotating scroll compressor of the present invention includes: 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, and
  • 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
  • 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,
  • an inner diameter of the rotor is larger than an outer diameter of a portion of the outer peripheral surface of the driving scroll on which the rotor is disposed, the driving scroll has, in the outer peripheral surface in a circumferential direction of the driving scroll, a first region that includes a connection portion where an end of the driving scroll spiral body on the outer peripheral side is connected to the driving scroll peripheral wall and a portion of the driving scroll peripheral wall, and a second region that includes a portion of the driving scroll peripheral wall other than the first region,
  • the driving scroll peripheral wall in the first region corresponds to a thick-walled portion where a first inner surface of the driving scroll peripheral wall in the first region facing inward in a radial direction of the driving scroll is positioned more inward in the radial direction than a second inner surface of the driving scroll peripheral wall in the second region facing inward in the radial direction, and
  • a torque transmission mechanism that transmits a torque from the rotor to the driving scroll is provided in the first region of the driving scroll and in a portion of the rotor corresponding to the first region.

In the co-rotating scroll compressor of the present invention, a torque transmission force from the rotor to the driving scroll can be secured by the torque transmission mechanism provided in the first region in the driving scroll and in the rotor.

The driving scroll peripheral wall in the first region of the driving scroll where the torque transmission mechanism is provided corresponds to a thick-walled portion having a thickness larger than that of the driving scroll peripheral wall in a second region, and has a higher strength due to its thickness. This suppresses deformation in the driving scroll peripheral wall due to the formation of the torque transmission mechanism, and hence deformation of the driving scroll.

Furthermore, since the inner diameter of the rotor is larger than the outer diameter of the outer peripheral surface of the driving scroll on which the rotor is disposed, the driving scroll is not deformed by the press-fitting allowance.

Therefore, according to the co-rotating scroll compressor of the present invention, it is possible to secure the torque transmission force from the rotor to the driving scroll while suppressing deformation of the driving scroll.

The first inner surface of the driving scroll peripheral wall in the first region is preferably formed along an involute curve which is an extension of the involute curve drawn by an inner side surface of the driving scroll.

In this case, the driving scroll spiral body is connected to the driving scroll peripheral wall such that the inner side surface of the driving scroll spiral body is continuous with the inner surface of the driving scroll peripheral wall, and thus the driving scroll peripheral wall becomes thick in the first region. Therefore, there is no need to provide a separate thick-walled portion.

The torque transmission mechanism is preferably formed of a recess and a protrusion that engages with the recess. The recess may be formed in an outer surface of the driving scroll in the first region facing outward in the radial direction of the driving scroll. The protrusion may be formed in the facing inner surface of the rotor facing the outer surface in the radial direction.

In this case, the torque transmission force from the rotor to the driving scroll can be more favorably secured by recess-protrusion engagement. Furthermore, the recess is formed in a thick-walled portion having a higher strength than that of other portions, so that reduction in strength caused by forming the recess may be suppressed.

The rotor may have a plurality of permanent magnets disposed at intervals in the circumferential direction. The torque transmission mechanism is preferably disposed facing one of the permanent magnets in the radial direction.

In this case, disturbance of magnetic field lines caused by the torque transmission mechanism can be suppressed.

It is preferable that a base circle of the involute curve drawn by the driving scroll spiral body is shifted toward the torque transmission mechanism with respect to a center of the rotor in the radial direction of the driving scroll.

In this case, the driving scroll may be surrounded from an outer peripheral side while preventing the inner diameter of the rotor from becoming large.

Advantageous Effects of Invention

According to the co-rotating scroll compressor of the present invention, it is possible to secure the torque transmission force from the rotor to the driving scroll while suppressing deformation of the driving scroll.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a cross-sectional view of a co-rotating scroll compressor of an embodiment.

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

FIG. 3 is a schematic cross-sectional view illustrating a state in which a base circle of a driving scroll spiral body is shifted with respect to a center of a rotor according to the co-rotating scroll compressor of the embodiment.

FIG. 4 is a schematic cross-sectional view illustrating a rotor and a driving scroll in a state in which a center of the rotor and a base circle of the driving scroll spiral body coincides with each other for comparison.

DESCRIPTION OF EMBODIMENTS

The following will describe an embodiment of the present invention with reference to the accompanying drawings.

As illustrated in FIG. 1, a co-rotating scroll compressor (hereinafter, simply referred to as a compressor) of a 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 invention. This compressor is mounted on a vehicle (not illustrated), and forms a part of a vehicle air conditioner.

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.

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.

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 from 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.

An inverter case having a connector portion is connected to a rear of the housing body 61. An inverter circuit having a circuit board and 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 portion, the inverter case, the inverter circuit, and the battery are omitted.

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.

A first shaft supporting portion 66 protrudes 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 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 a direction 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 is connected to the suction communication port 65A. Thus, refrigerant gas at low temperature and low pressure after flowing through an evaporator is drawn into the suction chamber 61A through the tube.

The discharge communication port 65B is located at a center of the cover 65 and extends through the cover 65 in a direction 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.

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.

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.

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 is formed of 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 disposed at equal intervals in a circumferential direction of the driving scroll 30.

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.

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.

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.

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.

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 at 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.

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.

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 larger strength than that of the driving scroll 30.

The bearing cover body 36 has a cover portion 37 and a first boss 38 formed integrally with the cover portion 37.

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.

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.

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 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.

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.

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.

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. 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.

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 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.

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.

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 larger than an outer diameter of the rotor accommodation portion 80. Specifically, the outer diameter of the peripheral wall shoulder portion 81 is larger 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. 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.

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 a portion of the driving scroll peripheral wall 32 other than the portion of the driving scroll peripheral wall 32 of the first region S.

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 of the driving scroll 30.

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.

A recess 87 is formed in an outer surface 86 of the driving scroll 30 facing outward in the radial direction of the driving scroll 30 in the first region S. 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. The recess 87 and the protrusion 114 are an example of the “torque transmission mechanism” of the present invention. That is, a torque transmission mechanism that transmits torque from the rotor 11 to the driving scroll 30 is provided in the first region S of the driving scroll 30 and in a portion of the rotor 11 corresponding to the first region S.

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 adjacent to each other.

As illustrated in FIG. 3, a base circle C of the involute curve drawn by the driving scroll spiral body 33 is shifted toward the recess 87 and the protrusion 114 with respect to the center O of the rotor 11 in the radial direction of the driving scroll 30. Although the illustration is omitted, a base circle of the involute curve drawn by the driven scroll spiral body 42 is also shifted toward the recess 87 and the protrusion 114 with respect to the center O of the rotor 11 in the radial direction of the driving scroll 30, accordingly.

An end ring 51 is disposed in front of the rotor 11 in the rotor accommodation portion 80. 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.

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 centers thereof. Thus, the driven mechanism 20 transmits a torque of the driving scroll 30 to the driven scroll 40.

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.

As a result, refrigerant 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 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.

Here, in this compressor, the recess 87 is formed in the outer surface 86 of the driving scroll 30, and the protrusion 114 that engages with the recess 87 is formed in the facing inner surface 113 of the rotor 11 that faces the outer surface 86 in the radial direction. Therefore, a torque transmission force from the rotor 11 to the driving scroll 30 can be favorably secured by the recess-protrusion engagement of the recess 87 and the protrusion 114.

The recess 87 is formed in the thick-walled portion 85 having a larger thickness and a higher strength than those of the other portions of the driving scroll peripheral wall 32. Thus, the deformation of the driving scroll peripheral wall 32 due to the formation of the recess 87 may be favorably suppressed.

Furthermore, since the torque transmission force from the rotor 11 to the driving scroll 30 is not secured by press-fitting the rotor 11 and the driving scroll 30, the driving scroll 30 is not deformed due to the press-fitting allowance. 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 effectively suppressed.

Therefore, according to this compressor, it is possible to secure the torque transmission force from the rotor 11 to the driving scroll 30 while suppressing deformation of the driving scroll 30.

In addition, in this compressor, the recess 87 is formed in the thick-walled portion 85 formed in the connection portion 82 where the end of the driving scroll spiral body 33 on the outer peripheral side thereof is connected to the driving scroll peripheral wall 32. Therefore, there is no need to provide a separate thick-walled portion to form the recess 87.

Furthermore, the recess 87 and the protrusion 114 are disposed so as to avoid the gaps between the permanent magnets 12 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.

In addition, the base circle C of the involute curve drawn by the driving scroll spiral body 33 is shifted toward the recess 87 and the protrusion 114 with respect to the center O of the rotor 11 in the radial direction of the driving scroll 30. As a result, the driving scroll 30 may be surrounded from the outer peripheral side by the rotor 11 while preventing the inner diameter of the rotor 11 from becoming large. As a result, as illustrated in FIG. 3, it is possible to prevent an increase in the outer diameter D1 of the rotor 11 and, hence an increase in the size of the compressor in the radial direction.

For comparison, FIG. 4 illustrates a rotor 91 and a driving scroll 92 in which a center of a base circle C of an involute curve drawn by a driving scroll spiral body 90 coincides with a center O of the rotor 91. In this case, an outer diameter D2 of the rotor 91 becomes larger than the outer diameter D1 of the rotor 11 in the compressor of the embodiment, and a connection portion 94 between the driving scroll spiral body 90 and a driving scroll peripheral wall 93 becomes excessively thick as compared to the connection portion 82 in the compressor of the embodiment.

Furthermore, in this compressor, a movement of the rotor 11 disposed on an outer peripheral surface of 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.

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.

The first boss 38 that is rotatably supported by the housing 60 via the needle roller bearing 72 is formed integrally with the bearing cover body 36, and the bearing cover body 36 has a strength larger 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.

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.

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.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the above-described embodiment, and may be modified as appropriate within the gist of the present invention.

For example, in the compressor of the embodiment, the torque transmission mechanism is configured by recess-protrusion engagement, but the present invention is not limited to this. For example, a pin may be fixed to the rotor instead of the protrusion, and the pin may be engaged with a recess provided in the driving scroll to form a torque transmission mechanism.

In the compressor of the embodiment, the first region S can be extended clockwise from the first region S in FIG. 2 by a region Q to the end of the spiral of the driving scroll spiral body 33 (a portion indicated by a symbol P in FIG. 2). In the compressor of the embodiment, when the first region S is extended in this manner, a space serving as the suction space (a space in the region Q) may be omitted and a thick-walled portion may be provided.

In the compressors of the embodiment, 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.

In the compressor of the embodiment, detachment of the rotor 11 from the driving scroll 30 is prevented by the bearing cover body 36 and the peripheral wall shoulder portion 81, but the present invention is not limited to this. For example, detachment prevention may be achieved by shrink fitting or by using bolts.

In the compressor of the embodiment, 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

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, and
  • 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
  • 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,
  • an inner diameter of the rotor is larger than an outer diameter of a portion of the outer peripheral surface of the driving scroll on which the rotor is disposed,
  • the driving scroll has, in the outer peripheral surface in a circumferential direction of the driving scroll, a first region that includes a connection portion where an end of the driving scroll spiral body on the outer peripheral side is connected to the driving scroll peripheral wall and a portion of the driving scroll peripheral wall, and a second region that includes a portion of the driving scroll peripheral wall other than the first region,
  • the driving scroll peripheral wall in the first region corresponds to a thick-walled portion where a first inner surface of the driving scroll peripheral wall in the first region facing inward in a radial direction of the driving scroll is positioned more inward in the radial direction than a second inner surface of the driving scroll peripheral wall in the second region facing inward in the radial direction, and
  • a torque transmission mechanism that transmits a torque from the rotor to the driving scroll is provided in the first region of the driving scroll and in a portion of the rotor corresponding to the first region.

Additional Note 2

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

• • the first inner surface of the driving scroll peripheral wall in the first region is formed along an involute curve which is an extension of an involute curve drawn by an inner side surface of the driving scroll spiral body.

Additional Note 3

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

• • the torque transmission mechanism is formed of a recess that is formed in an outer surface of the driving scroll facing outward in the radial direction in the first region, and a protrusion that is formed in a facing inner surface of the rotor facing the outer surface in the radial direction and engages with the recess.

Additional Note 4

The co-rotating scroll compressor according to any one of Additional notes 1 to 3, wherein,

• • the rotor has a plurality of permanent magnets disposed at intervals in the circumferential direction, and
  • the torque transmission mechanism is disposed facing one of the permanent magnets in the radial direction.

Additional Note 5

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

• • a base circle of an involute curve drawn by the driving scroll spiral body is shifted toward the torque transmission mechanism with respect to a center of the rotor in the radial direction.

INDUSTRIAL APPLICABILITY

The present invention is applicable to the air conditioner for the vehicle, or the like.

REFERENCE SIGNS LIST

• • 10 electric motor (driving mechanism)
  • 11 rotor
  • 12 permanent magnet
  • 113 facing inner surface
  • 114 protrusion (torque transmission mechanism)
  • 20 driven mechanism
  • 30 driving scroll
  • 31 driving scroll end plate
  • 32 driving scroll peripheral wall
  • 33 driving scroll spiral body
  • 331 inner side surface
  • 82 connection portion
  • 83 first inner surface
  • 84 second inner surface
  • 85 thick-walled portion
  • 86 outer surface
  • 87 recess (torque transmission mechanism)
  • 40 driven scroll
  • 41 driven scroll end plate
  • 42 driven scroll spiral body
  • 55 compression chamber
  • 60 housing
  • R1 driving axis
  • R2 driven axis
  • S first region
  • C base circle

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, and

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

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,

an inner diameter of the rotor is larger than an outer diameter of a portion of the outer peripheral surface of the driving scroll on which the rotor is disposed,

the driving scroll has, in the outer peripheral surface in a circumferential direction of the driving scroll, a first region that includes a connection portion where an end of the driving scroll spiral body on the outer peripheral side is connected to the driving scroll peripheral wall and a portion of the driving scroll peripheral wall, and a second region that includes a portion of the driving scroll peripheral wall other than the first region,

the driving scroll peripheral wall in the first region corresponds to a thick-walled portion where a first inner surface of the driving scroll peripheral wall in the first region facing inward in a radial direction of the driving scroll is positioned more inward in the radial direction than a second inner surface of the driving scroll peripheral wall in the second region facing inward in the radial direction, and

a torque transmission mechanism that transmits a torque from the rotor to the driving scroll is provided in the first region of the driving scroll and in a portion of the rotor corresponding to the first region.

2. The co-rotating scroll compressor according to claim 1, wherein

the first inner surface of the driving scroll peripheral wall in the first region is formed along an involute curve which is an extension of an involute curve drawn by an inner side surface of the driving scroll spiral body.

3. The co-rotating scroll compressor according to claim 1, wherein

the torque transmission mechanism is formed of a recess that is formed in an outer surface of the driving scroll facing outward in the radial direction in the first region, and a protrusion that is formed in a facing inner surface of the rotor facing the outer surface in the radial direction and engages with the recess.

4. The co-rotating scroll compressor according to claim 1, wherein

the rotor has a plurality of permanent magnets disposed at intervals in the circumferential direction, and

the torque transmission mechanism is disposed facing one of the permanent magnets in the radial direction.

5. The co-rotating scroll compressor according to claim 1, wherein

a base circle of an involute curve drawn by the driving scroll spiral body is shifted toward the torque transmission mechanism with respect to a center of the rotor in the radial direction.