Bidirectional rotary scroll-type compressor

Abstract

A stator (17) is fixed to a protruding body (64) in this bidirectional rotary scroll compressor. A drive scroll (30) is supported by the protruding body (64) so as to be capable of rotating about a drive axis (O1). Furthermore, a driven scroll (40) is supported by the protruding body (64) so as to be capable of rotating about a driven axis (O2). The protruding body (64) is attached to a housing (6) by means of an elastically deformable elastic body (70). The elastic body (70) has first elastic parts (70a, 70b) set to a first spring constant, and second elastic parts (70c, 70d) set to a second spring constant which is higher than the first spring constant.

Description

Double-rotation scroll compressor

[0001] The present invention relates to a double-rotation scroll compressor.

[0002] Patent Document 1 discloses a conventional double-rotation scroll compressor (hereinafter simply referred to as a compressor as appropriate). This compressor includes a housing, a driving scroll, a driven scroll, a driving mechanism, and a driven mechanism. The housing has a scroll chamber that accommodates the driving mechanism, the driving scroll, and the driven scroll. Fluid is sucked into the scroll chamber from the outside of the housing. In this document, the fluid is specifically a refrigerant.

[0003] The driving mechanism includes a stator and a rotor. The stator is formed in a cylindrical shape, and the outer circumference thereof is fixed to the housing. The rotor is arranged on the inner circumferential side of the stator. The driving scroll has a cylindrical extending portion. The rotor is fixed to the outer circumferential surface of the extending portion. Accordingly, the driving scroll can be rotationally driven around the driving shaft center by the rotation of the rotor. The driven scroll is eccentric with respect to the driving scroll, and can be rotationally driven around the driven shaft center by the driving scroll and the driven mechanism. The driving scroll and the driven scroll form a compression chamber that compresses fluid through rotational driving and rotational driven movement.

[0004] Furthermore, in this compressor, a protruding body is integrally provided on the housing. The protruding body is formed in a substantially cylindrical shape with a constant outer diameter, and extends into the scroll chamber in the direction of the driving shaft center toward the driving scroll and the driven scroll. The protruding body enters the inside of the extending portion, and the protruding body rotatably supports a cover body via a bearing. Further, a fluid passage extending in the direction of the driving shaft center is formed inside the protruding body. The fluid passage communicates with the compression chamber at one end in the direction of the driving shaft center, and communicates with the outside of the housing at the other end in the direction of the driving shaft center.

[0005] In this compressor, the fluid in the scroll chamber is sucked into the compression chamber and compressed in the compression chamber. Then, the fluid compressed in the compression chamber flows through the fluid passage and is discharged to the outside of the housing, that is, the outside of the compressor.

[0006] Japanese Unexamined Patent Publication No. 2-227575

[0007] In the conventional compressor described above, the rotor is fixed to the extended portion of the cover body, and the extended portion is rotatably supported by the protruding portion. As a result, vibrations generated by the drive mechanism during operation are transmitted from the extended portion to the protruding portion and, consequently, to the housing. Furthermore, vibrations generated by the drive scroll during operation are also transmitted to the protruding portion through the extended portion. Due to these factors, the housing, including the protruding portion, is prone to vibration during operation. Consequently, the quietness of this compressor is compromised.

[0008] Therefore, one might consider, for example, providing an elastic body between the extended portion and the protruding body, and suppressing the transmission of vibrations from the extended portion to the protruding body through the elastic deformation of the elastic body. However, the frequency of vibrations generated during operation is not uniform. As a result, during operation, a first vibration mode with a low frequency and a second vibration mode with a higher frequency than the first vibration mode may occur. Therefore, if the transmission of both low-frequency and high-frequency vibrations to the protruding body cannot be suppressed by the elastic body, the vibration of the housing, including the protruding body, cannot be sufficiently suppressed.

[0009] Furthermore, while increasing the rigidity of the housing could suppress vibrations during operation, this would lead to an increase in the size of the housing and, consequently, the compressor.

[0010] This invention has been made in view of the above-mentioned conventional circumstances, and aims to solve the problem of providing a dual-rotation scroll compressor that is excellent in quietness and can suppress the increase in size.

[0011] The double-rotation scroll compressor of the present invention comprises a housing, a drive scroll, a driven scroll, a drive mechanism, and a driven mechanism, wherein the housing has a scroll chamber in which the drive scroll, the driven scroll, and the drive mechanism are housed, the drive mechanism has a stator and a rotor that is rotationally driven by the stator, the drive scroll is rotationally driven around a drive axis by the drive mechanism, the driven scroll is rotationally driven around a driven axis by the drive scroll and the driven mechanism while being eccentric with respect to the drive scroll, and the drive scroll and the driven scroll form a compression chamber for compressing fluid by the rotational drive and the rotational drive, wherein the stator is fixed inside the scroll chamber and a projection is provided extending in the direction of the drive axis toward the drive scroll and the driven scroll, the drive scroll is rotatably supported by the projection around the drive axis, the driven scroll is rotatably supported by the projection around the driven axis, and the projection is attached to the housing via an elastically deformable elastic body. The elastic body is characterized by having a first elastic portion set to a first spring constant and a second elastic portion set to a second spring constant higher than the first spring constant.

[0012] In the dual-rotation scroll compressor of the present invention, the stator is fixed to a projection located within the scroll chamber. As a result, vibrations generated in the drive mechanism during operation are inevitably transmitted to the projection. Furthermore, the drive scroll is supported on the projection so as to be rotatable around the drive axis, and the driven scroll is also supported so as to be rotatable around the driven axis. Therefore, vibrations generated in both the drive scroll and the driven scroll during operation are also inevitably transmitted to the projection.

[0013] In this compressor, the protruding body is attached to the housing via an elastic body. The elastic body has a first elastic section set to a first spring constant and a second elastic section set to a second spring constant higher than the first. As a result, the second elastic section is less elastically deformable than the first elastic section, while the first elastic section is more elastically deformable than the second elastic section.

[0014] Thus, in the elastic body, the second elastic part becomes less elastically deformable, allowing the vibration frequency to be increased by the second elastic part during the first vibration mode, which has a low vibration frequency. This allows the vibration frequency in the first vibration mode to be removed from the range of the first rotational vibration, thus effectively suppressing the transmission of low-frequency vibrations from the protrusion to the housing. On the other hand, in the elastic body, the first elastic part is easily elastically deformable, allowing the vibration frequency to be decreased by the first elastic part during the second vibration mode, which has a higher vibration frequency than the first vibration mode. This effectively suppresses the transmission of high-frequency vibrations from the protrusion to the housing.

[0015] Thus, in this compressor, both low-frequency and high-frequency vibrations can be effectively suppressed from being transmitted from the protruding body to the housing by the elastic body.

[0016] Furthermore, because vibrations generated during operation are suppressed from being transmitted to the housing, this compressor does not require excessively high housing rigidity to suppress housing vibration during operation. For this reason, the housing of this compressor is less likely to become large.

[0017] Therefore, the dual-rotation scroll compressor of the present invention offers excellent quietness and can be made smaller in size.

[0018] It is preferable that the second elastic section is positioned closer to the compression chamber in the direction of the drive axis than the first elastic section. In this case, the elastic body can more effectively suppress the transmission of vibrations from the protruding body to the housing.

[0019] The housing may have a retaining portion that extends in the direction of the drive axis and is positioned inside the projection. Preferably, the elastic body is positioned between the retaining portion and the projection. In this case, the projection can be attached to the housing while the elastic body is easily provided between the projection and the retaining portion, and consequently between the projection and the housing.

[0020] It is preferable that there are multiple first and second elastic sections. In this case, compared to the case where there is one first and one second elastic section, the transmission from the protruding body to the housing can be effectively suppressed.

[0021] Furthermore, it is preferable that the first elastic section and the second elastic section are formed separately. In this case, the degree of freedom in designing the arrangement of the first and second elastic sections can be increased, allowing for a suitable distribution of the first and second elastic sections. Also, by making the first and second elastic sections separate, it becomes possible to form them from materials with different hardnesses. Therefore, in this compressor, the first spring constant and the second spring constant can be set appropriately.

[0022] Furthermore, it is preferable that the second elastic portion is formed to be thicker than the first elastic portion. In this case, when the protruding body is attached to the housing via the elastic body, the compression allowance of the second elastic portion is greater than that of the first elastic portion, so the second spring constant in the second elastic portion can be suitably made higher than the first spring constant in the first elastic portion.

[0023] Furthermore, the protruding body may have a cylindrical portion extending in the direction of the drive axis, with a holding portion and an elastic body disposed inside. The elastic body may be cylindrical in shape extending in the direction of the drive axis and inserted through the holding portion. The inner diameter of the cylindrical portion may gradually decrease in the direction of the drive axis from the housing side toward the drive scroll and driven scroll. The elastic body may be formed to gradually become thinner in the direction of the drive axis from the housing side toward the drive scroll and driven scroll. The housing side end of the elastic body may be the first elastic portion. It is also preferable that the drive scroll and driven scroll side ends of the elastic body be the second elastic portion.

[0024] In this case, the first elastic section of the elastic body has the thickest wall, and the second elastic section has the thinnest wall. Furthermore, in this compressor, due to the shape of the inner diameter of the cylindrical section and the shape of the elastic body, when the holding section and elastic body are arranged inside the cylindrical section, the amount of compression of the elastic body that undergoes elastic deformation becomes almost constant. As a result, in this compressor as well, the second spring constant in the second elastic section can be suitably made higher than the first spring constant in the first elastic section.

[0025] The dual-rotation scroll compressor of the present invention offers excellent quietness and can be made larger without increasing its size.

[0026] Figure 1 is a cross-sectional view of the compressor of Example 1. Figure 2 is an enlarged cross-sectional view of the main parts of the compressor of Example 1, showing the elastic body, etc. Figure 3 is an enlarged cross-sectional view of the main parts of the compressor of Example 2, similar to Figure 2, showing the elastic body, etc. Figure 4 is an enlarged cross-sectional view of the main parts of the compressor of Example 2, showing the attachment of the protruding body to the housing. Figure 5 is an enlarged cross-sectional view of the compressor of Example 3, similar to Figure 2, showing the elastic body, etc. Figure 6 is an enlarged cross-sectional view of the compressor of Example 3, showing the attachment of the protruding body to the housing. Figure 7 is an enlarged cross-sectional view of the compressor of Example 4, similar to Figure 2, showing the elastic body, etc. Figure 8 is an enlarged cross-sectional view of the compressor of Example 4, showing the attachment of the protruding body to the housing.

[0027] The following describes four embodiments of the present invention with reference to the drawings. The compressors of embodiments 1 to 4 are mounted on a vehicle (not shown) and constitute the vehicle's air conditioning system.

[0028] As shown in Figure 1, the compressor of Embodiment 1 comprises a housing 6, an electric motor 10, a drive scroll 30, a driven scroll 40, and a driven mechanism 20. The electric motor 10 is an example of a "drive mechanism" in the present invention.

[0029] In this embodiment, the front-rear and up-down directions of the compressor are defined by the solid arrows shown in Figure 1. The front-rear and up-down directions are orthogonal to each other. Then, in Figures 2 and onward, the front-rear and up-down directions of the compressor are defined in correspondence with Figure 1. Note that these front-rear and up-down directions are examples for the sake of explanation, and the compressor can change its own orientation as appropriate depending on the vehicle on which it is mounted.

[0030] As shown in Figure 1, the housing 6 is composed of a housing body 60, a first housing cover 61, and a second housing cover 62. These housing body 60, first housing cover 61, and second housing cover 62 are made of aluminum alloy. However, the housing body 60, first housing cover 61, and second housing cover 62 may also be made of steel or the like.

[0031] The housing body 60 is cylindrical with a drive shaft center O1 at its center, and has openings at its front and rear ends. The drive shaft center O1 is parallel to the front-rear direction. The housing body 60 also has an intake port 68. The intake port 68 extends radially from the housing body 60. The intake port 68 is connected to an evaporator (not shown) through piping (not shown).

[0032] The first housing cover 61 is located at the rear end of the housing body 60. The first housing cover 61 is substantially disc-shaped with the drive shaft center O1 as its center and extends radially from the housing 6. The first housing cover 61 has a front surface 61a that faces forward and a rear surface 61b that is located opposite the front surface 61a and faces rear.

[0033] Furthermore, the first housing cover 61 has a retaining portion 611. As shown in Figure 2, the retaining portion 611 is integrally formed with the first housing cover 61. The retaining portion 611 protrudes cylindrically forward from the center of the front surface 61a in the direction of the drive axis O1.

[0034] The retaining portion 611 has four retaining grooves 81a to 81d formed therein. Each retaining groove 81a to 81d is recessed in the outer circumferential surface 611a of the retaining portion 611, forming an annular shape that encircles the outer circumferential surface 611a of the retaining portion 611. The retaining grooves 81a to 81d are arranged in the order of retaining groove 81a, retaining groove 81b, retaining groove 81c, and retaining groove 81d, from the rear side to the front side of the retaining portion 611. Furthermore, these retaining grooves 81a to 81d are arranged with a predetermined distance between them in the direction of the drive axis O1. Here, the distance between retaining groove 81b and retaining groove 81c in the direction of the drive axis O1 is wider than the distance between retaining groove 81a and retaining groove 81b, and the distance between retaining groove 81c and retaining groove 81d.

[0035] Furthermore, a one-sided elastic body 70 is attached to the holding portion 611. The one-sided elastic body 70 is an example of an "elastic body" in the present invention. The one-sided elastic body 70 is composed of two first elastic bodies 70a and 70b and two second elastic bodies 70c and 70d. The first elastic bodies 70a and 70b are examples of a "first elastic part" in the present invention. The second elastic bodies 70c and 70d are examples of a "second elastic part" in the present invention.

[0036] The first elastic bodies 70a, 70b and the second elastic bodies 70c, 70d are each formed as separate components. Furthermore, the first elastic bodies 70a, 70b and the second elastic bodies 70c, 70d are formed in an annular shape having the same outer diameter.

[0037] The first elastic bodies 70a and 70b are formed from an elastically deformable resin such as synthetic rubber. As a result, the first elastic bodies 70a and 70b are set to a first spring constant. The second elastic bodies 70c and 70d are also formed from an elastically deformable resin such as synthetic rubber, or from nitrile rubber, silicone rubber, etc. Here, the second elastic bodies 70c and 70d are formed from a resin with higher hardness than the first elastic bodies 70a and 70b. As a result, the second elastic bodies 70c and 70d are set to a second spring constant, which is higher than the first spring constant. Note that if the first elastic bodies 70a and 70b are set to a first spring constant and the second elastic bodies 70c and 70d are set to a second spring constant, the first elastic bodies 70a and 70b and the second elastic bodies 70c and 70d may be formed from a metal or the like with lower rigidity than the first housing cover 61.

[0038] The first elastic body 70a is housed in the retaining groove 81a. The first elastic body 70b is housed in the retaining groove 81b. The second elastic body 70c is housed in the retaining groove 81c. The second elastic body 70d is housed in the retaining groove 81d. In this way, the first elastic bodies 70a, 70b and the second elastic bodies 70c, 70d, i.e., the one-sided elastic bodies 70, are attached to the retaining portion 611. Furthermore, in the retaining portion 611, the second elastic bodies 70c, 70d are positioned further forward in the direction of the drive axis O1 than the first elastic bodies 70a, 70b.

[0039] Furthermore, a protruding body 64 is provided inside the housing 6. The protruding body 64, including the retaining portion 611, is formed as a separate part from the first housing cover 61. The protruding body 64 is made of steel. The protruding body 64 is composed of a first diameter portion 641 and a second diameter portion 642. The first diameter portion 641 constitutes the front part of the protruding body 64. The first diameter portion 641 is formed to be smaller in diameter than the insertion hole 375, which will be described later. A pin hole 4 is formed in the first diameter portion 641. The pin hole 4 extends through the interior of the first diameter portion 641 in the direction of the drive axis O1 and opens to the front end surface of the first diameter portion 641.

[0040] Furthermore, a first radial ball bearing 51 is provided on the outer circumferential surface of the first diameter portion 641. Alternatively, a sliding bearing may be provided on the outer circumferential surface of the first diameter portion 641 instead of the first radial ball bearing 51.

[0041] The second diameter portion 642 is integrated with the first diameter portion 641 at the front end. Accordingly, the second diameter portion 642 constitutes the rear part of the protrusion 64. The second diameter portion 642 is formed in a bottomed cylindrical shape with an open rear end. The outer diameter of the second diameter portion 642 is formed larger than that of the first diameter portion 641. In addition, the inner diameter of the second diameter portion 642 is larger than that of the holding portion 611, and is formed to be slightly smaller than the outer diameter of the one-side elastic body 70 disposed on the holding portion 611, that is, the outer diameter of the first elastic bodies 70a, 70b and the second elastic bodies 70c, 70d disposed on the holding portion 611.

[0042] The protrusion 64 accommodates the holding portion 611 and the one-side elastic body 70 inside the second diameter portion 642. Accordingly, the holding portion 611 is disposed inside the second diameter portion 642. In addition, as described above, since the inner diameter of the second diameter portion 642 is smaller than the outer diameter of the one-side elastic body 70, the one-side elastic body 70, that is, the first elastic bodies 70a, 70b and the second elastic bodies 70c, 70d are each elastically deformed in the radial direction of the housing 6, and are disposed between the holding portion 611 and the second diameter portion 642.

[0043] In this way, the protrusion 64 is attached to the first housing cover 61 via the one-side elastic body 70. Then, the first housing cover 61 supports the protrusion 64 by the holding portion 611 holding the protrusion 64 from the inner side via the one-side elastic body 70.

[0044] As shown in FIG. 1, the second housing cover 62 is disposed in front of the housing body 60. The second housing cover 62 has a substantially disk shape centered on the drive axis O1, and extends in the radial direction of the housing 6. The second housing cover 62 has a front surface 62a facing forward, and a rear surface 62b located on the opposite side of the front surface 62a and facing rearward.

[0045] Further, the second housing cover 62 is formed with a support portion 66 and a discharge communication port 69. The support portion 66 is integrally formed substantially at the center of a rear surface 62b, and protrudes rearward from the rear surface 62b. The support portion 66 is formed in a cylindrical shape centered on the drive shaft center O1, and a second radial ball bearing 52, the other-side elastic body 67, and a shaft sealing member 63 are provided inside the support portion 66.

[0046] The other-side elastic body 67 is formed of an elastically deformable resin such as synthetic rubber, and has a cylindrical shape. The other-side elastic body 67 is disposed between the support portion 66 and the second radial ball bearing 52, and holds the second radial ball bearing 52 within the support portion 66 while surrounding the second radial ball bearing 52 from the outer side. It should be noted that the other-side elastic body 67 may be formed of a metal or the like having lower rigidity than the second housing cover 62. Further, the thickness of the other-side elastic body 67 can be appropriately designed. Furthermore, a sliding bearing may be provided inside the support portion 66 instead of the second radial ball bearing 52.

[0047] The shaft sealing member 63 is disposed inside the support portion 66 forward of the second radial ball bearing 52 and the other-side elastic body 67. The shaft sealing member 63 is formed in an annular shape.

[0048] The discharge communication port 69 penetrates the second housing cover 62 in the direction of the drive shaft center O1, and communicates with the inside of the support portion 66. Further, the discharge communication port 69 is connected to a condenser (not shown) through a pipe (not shown).

[0049] In the housing 6, a front surface 61a of the first housing cover 61 is in contact with the rear end of the housing main body 60, and a rear surface 62b of the second housing cover 62 is in contact with the front end of the housing main body 60. Then, the housing main body 60, the first housing cover 61, and the second housing cover 62 are fixed in the direction of the drive shaft center O1 by a plurality of bolts (not shown).

[0050] Thus, in the housing 6, the housing body 60 is sandwiched in the front-rear direction by the first housing cover 61 and the second housing cover 62, and the front and rear ends of the housing body 60 are closed by the first housing cover 61 and the second housing cover 62, respectively. As a result, a scroll chamber 65 is formed inside the housing body 60 in the housing 6. The scroll chamber 65 is in communication with the intake port 68. Therefore, refrigerant is drawn into the scroll chamber 65 from outside the housing 6 through the intake port 68. The refrigerant is an example of a "fluid" in this invention.

[0051] Furthermore, as described above, the projection 64 is attached to the first housing cover 61, so the projection 64 is positioned within the scroll chamber 65. Within the scroll chamber 65, the projection 64 protrudes forward from the first housing cover 61 toward the drive scroll 30 and the driven scroll 40.

[0052] The electric motor 10 is housed within the scroll chamber 65. Thus, the scroll chamber 65 also serves as the motor chamber housing the electric motor 10.

[0053] As shown in Figure 2, the electric motor 10 is composed of a stator 17 and a rotor 11. The stator 17 has a stator core 17a and windings 17b. The stator core 17a is formed in a cylindrical shape with the drive axis O1 as the center. The windings 17b are wound around the stator core 17a. As a result, the windings 17b form a first coil end 171 and a second coil end 172.

[0054] The first coil end 171 protrudes cylindrically forward from the stator core 17a in the direction of the drive axis O1. The second coil end 172 is located on the opposite side of the stator core 17a from the first coil end 171. The second coil end 172 protrudes cylindrically backward from the stator core 17a in the direction of the drive axis O1.

[0055] In the stator 17, the stator core 17a is fitted onto the outer circumferential surface of the second diameter portion 642. In this way, the stator core 17a is fixed to the outer circumferential surface of the second diameter portion 642, and consequently to the outer circumferential surface of the protruding body 64. Although not shown in the figures, multiple slits extending in the direction of the drive axis O1 are formed on the inner circumferential surface of the stator core 17a. As a result, the slits form a gap between the stator core 17a and the outer circumferential surface of the second diameter portion 642 while the stator core 17a is fixed to the second diameter portion 642.

[0056] The rotor 11 is cylindrical around the drive axis O1. Although detailed illustrations are omitted, the rotor 11 is composed of multiple permanent magnets corresponding to the stator 17 and laminated steel plates that fix each permanent magnet. The rotor 11 is also formed to be larger in diameter than the stator core 17a. As a result, the rotor 11 covers the stator core 17a from the outside within the scroll chamber 65 and is rotationally driven by the stator 17. Furthermore, the rotor 11 has multiple first bolt holes 11a. Each first bolt hole 11a penetrates the rotor 11 in the direction of the drive axis O1.

[0057] As shown in Figure 1, the drive scroll 30 is housed in the scroll chamber 65. The drive scroll 30 is made of aluminum alloy. The drive scroll 30 includes a drive end plate 31, a drive spiral body 33, a drive peripheral wall 35, a cover body 37, and a case 39.

[0058] The drive end plate 31 extends in a substantially disc shape perpendicular to the drive axis O1 and the driven axis O2. The driven axis O2 extends parallel to the drive axis O1 while being eccentric with respect to the drive axis O1. In other words, the driven axis O2 is also parallel in the front-rear direction. The drive end plate 31 has a first front surface 311 facing forward and a first rear surface 312 located on the opposite side of the first front surface 311 and facing rear.

[0059] Furthermore, a discharge port 32 is formed in the drive end plate 31. The discharge port 32 penetrates the drive end plate 31 in the direction of the drive axis O1. In addition, a discharge reed valve 57 and a retainer 58 are fixed to the first front surface 311 of the drive end plate 31 by fixing bolts 59. As a result, the discharge reed valve 57 can open and close the discharge port 32. The retainer 58 can adjust the opening degree of the discharge reed valve 57.

[0060] The drive spiral body 33 is integral with the drive end plate 31 and protrudes from the first rear surface 312 toward the rear, i.e., toward the driven scroll 40, parallel to the drive axis O1 and the driven axis O2. Although detailed illustration is omitted, the drive spiral body 33 has the center of the drive end plate 31 as its spiral center and protrudes outward from the spiral center in a spiral shape.

[0061] The drive circumferential wall 35 is formed in a cylindrical shape, extending parallel to the drive axis O1 and the driven axis O2, with the drive axis O1 as its center. The front end of the drive circumferential wall 35 is integral with the outer peripheral edge of the drive end plate 31. As a result, the drive circumferential wall 35 surrounds the drive spiral body 33 from the outside and protrudes cylindrically toward the rear from the first rear surface 312. Although not shown in the figures, the outer peripheral end of the spiral in the drive spiral body 33 is connected to the inner peripheral surface of the drive circumferential wall 35.

[0062] As shown in Figure 2, the cover body 37 has a wall portion 37a, an inner cylindrical portion 37b, a connecting portion 37c, and an outer cylindrical portion 37d. The wall portion 37a extends in a substantially plate-like shape in the radial direction of the cover body 37. The wall portion 37a has a second front surface 371 facing forward and a second rear surface 372 located on the opposite side of the second front surface 371 and facing rear.

[0063] A recess 373 and an intake port 374 are formed in the wall portion 37a. The recess 373 is located approximately in the center of the second front surface 371 and is recessed from the second front surface 371 toward the rear.

[0064] The intake port 374 is located radially outside the cover body 37, i.e., radially outside the housing 6, relative to the recess 373. The intake port 374 penetrates the wall portion 37a in the front-rear direction, with its front end opening to the second front surface 371 and its rear end opening to the second rear surface 372.

[0065] Furthermore, in the wall portion 37a, multiple rings 22 are attached between the recess 373 and the intake port 374. Although detailed illustrations are omitted, each ring 22 is arranged at equal intervals in the circumferential direction of the recess 373, facing forward, and surrounds the recess 373 from the outside. In this embodiment, there are six rings 22. Figures 1-3, 5, and 7 illustrate one of the six rings 22.

[0066] As shown in Figure 2, the inner cylindrical portion 37b is formed radially inward of the cover body 37 beyond the stator 17 and extends cylindrically toward the rear in the direction of the drive axis O1. The inner diameter of the inner cylindrical portion 37b is larger than the first diameter portion 641 of the protruding body 64 and is formed to be approximately the same as the outer diameter of the first radial ball bearing 51.

[0067] The connecting portion 37c is located between the wall portion 37a and the inner cylindrical portion 37b, and is integral with the wall portion 37a and the inner cylindrical portion 37b. The connecting portion 37c expands in diameter from the inner cylindrical portion 37b toward the wall portion 37a in the direction of the drive axis O1, connecting the wall portion 37a and the inner cylindrical portion 37b. As a result, the outer circumferential surface of the inner cylindrical portion 37b and the second rear surface 372 of the wall portion 37a are continuous through the connecting portion 37c.

[0068] Furthermore, an insertion hole 375 is formed inside the connecting portion 37c of the cover body 37. The insertion hole 375 extends in the direction of the drive shaft center O1 and connects the inner cylindrical portion 37b and the recess 373.

[0069] The outer cylindrical portion 37d is integral with the wall portion 37a at its outer peripheral edge. As a result, the outer cylindrical portion 37d is connected to the wall portion 37a and extends cylindrically backward from the wall portion 37a in the direction of the drive axis O1. The outer diameter of the outer cylindrical portion 37d is formed to be approximately the same as the outer diameter of the drive peripheral wall 35 and the outer diameter of the rotor 11.

[0070] Furthermore, the inner diameter of the outer cylindrical portion 37d is formed to be larger than that of the inner cylindrical portion 37b and the connecting portion 37c. As a result, in the cover body 37, the inner cylindrical portion 37b and the connecting portion 37c are positioned on the inner circumference side of the outer cylindrical portion 37d, spaced radially away from the outer cylindrical portion 37d of the cover body 37. In this way, the cover body 37 has a housing portion 38 formed by the wall portion 37a, the inner cylindrical portion 37b, the connecting portion 37c, and the outer cylindrical portion 37d. The housing portion 38 is a bottomed annular shape that opens at the rear. The housing portion 38 is in communication with the intake port 374.

[0071] Furthermore, multiple second bolt holes 376 are formed in the outer cylindrical portion 37d. Each second bolt hole 376 penetrates the outer cylindrical portion 37d in the direction of the drive axis O1. Although not shown in the figures, the number of second bolt holes 376 is equal to the number of first bolt holes 11a formed in the rotor 11. In Figures 1-3, 5, and 7, one of the multiple first bolt holes 11a and one of the multiple second bolt holes 376 are shown.

[0072] As shown in Figure 1, the cover body 37 has the front end of the outer cylindrical portion 37d in contact with the rear end of the drive peripheral wall 35. The cover body 37 also has the rotor 11 in contact with the rear end of the outer cylindrical portion 37d. In this state, the first bolts 34a are inserted from the rotor 11 side into each of the first bolt holes 11a and each of the second bolt holes 376, respectively, and the first bolts 34a are screwed into the drive peripheral wall 35. In this way, the cover body 37 is sandwiched between the drive peripheral wall 35 and the rotor 11 and fixed to the drive peripheral wall 35 and the rotor 11. As a result, the drive scroll 30 is integrated with the rotor 11.

[0073] Case 39 is a bottomed cylindrical member having an outer peripheral wall 39a and a front wall 39b. The outer peripheral wall 39a is cylindrical with the drive axis O1 as its center. Here, the outer diameter of the outer peripheral wall 39a is formed to be approximately the same as the outer diameter of the drive peripheral wall 35.

[0074] The front wall 39b is located at the front end of the case 39. The front wall 39b extends in a substantially disc shape perpendicular to the drive axis O1 and the driven axis O2. The outer edge of the front wall 39b is connected to the front end of the outer peripheral wall 39a. A boss 39d is formed on the front wall 39b. The boss 39d is integrally formed in the center of the front wall 39b and protrudes forward from the front wall 39b in the direction of the drive axis O1. The outer diameter of the boss 39d is formed to be substantially the same as the inner diameter of the second radial ball bearing 52 and the inner diameter of the shaft sealing member 63. A discharge passage 390 is also formed on the boss 39d. The discharge passage 390 penetrates the boss 39d in the direction of the drive axis O1.

[0075] Furthermore, third bolt holes 39e are formed in the outer periphery wall 39a and the front wall 39b. The third bolt holes 39e penetrate the outer periphery wall 39a and the front wall 39b in the direction of the drive axis O1. Although not shown in the figures, multiple third bolt holes 39e are formed in the outer periphery wall 39a and the front wall 39b. Figure 1 shows one of these multiple third bolt holes 39e.

[0076] The case 39 has its rear outer wall 39a in contact with the front end of the drive circumferential wall 35. In this state, the second bolts 34b are inserted through each of the third bolt holes 39e, and the second bolts 34b are screwed into the drive circumferential wall 35. In this way, the case 39 is fixed to the drive circumferential wall 35 in the drive scroll 30.

[0077] In this way, by fixing the case 39 to the drive peripheral wall 35, a discharge chamber 14 is formed inside the outer peripheral wall 39a, between the front wall 39b of the case 39 and the drive end plate 31. The discharge chamber 14 is in communication with the discharge port 32 and also with the discharge passage 390.

[0078] The driven scroll 40 is made of aluminum alloy. The driven scroll 40 has a driven end plate 41 and a driven spiral body 43.

[0079] The driven end plate 41 extends in a substantially disc shape perpendicular to the drive axis O1 and the driven axis O2. The driven end plate 41 has a third front surface 411 facing forward and a third rear surface 412 located on the opposite side of the third front surface 411 and facing rear.

[0080] A receiving recess 15 is formed in the driven end plate 41. The receiving recess 15 is located in the center of the driven end plate 41. The receiving recess 15 is recessed in a cylindrical shape from the third rear surface 412 of the driven end plate 41 toward the front, with the driven axis O2 as the center. As a result, the receiving recess 15 opens toward the rear of the driven end plate 41, and consequently toward the first diameter portion 641 of the protruding body 64.

[0081] As shown in Figure 2, a driven shaft portion 16 and a sliding bearing 13 are provided within the housing recess 15. The driven shaft portion 16 has a bush 53 and a driven pin 55. The bush 53 is housed within the housing recess 15 via the sliding bearing 13. The driven pin 55 is inserted through the bush 53. More specifically, the driven pin 55 is inserted through the bush 53 at a position eccentric to the center of the bush 53, i.e., the driven axis O2. The driven pin 55 protrudes rearward from the bush 53 and, consequently, from the driven end plate 41.

[0082] Furthermore, a pivot pin 21 is fixed to the driven end plate 41 at the location facing the ring 22. The pivot pin 21 protrudes rearward from the third rear surface 412. Six pivot pins 21 are fixed to the driven end plate 41, the same number as the rings 22. Figures 1-3, 5 and 7 illustrate one of the six pivot pins 21.

[0083] The driven mechanism 20 is then composed of these pivot pins 21 and rings 22. Here, the number of pivot pins 21 and rings 22 can be designed as appropriate, as long as there are three or more of each.

[0084] As shown in Figure 1, the driven spiral body 43 is integral with the driven end plate 41 and extends forward from the third front surface 411 of the driven end plate 41 parallel to the drive axis O1 and the driven axis O2. The driven spiral body 43 has the center of the driven end plate 41 as its spiral center and extends outward from the spiral center.

[0085] In this compressor, a driven scroll 40 is housed within the drive scroll 30, more specifically, between the drive end plate 31 and the drive peripheral wall 35 and the cover body 37. The drive spiral body 33 and the driven spiral body 43 are meshed together. As a result, the drive spiral body 33 and the driven spiral body 43 face each other to form a compression chamber 12.

[0086] Furthermore, a suction section 30a is formed between the drive peripheral wall 35 and the driven scroll 40. In other words, the drive spiral body 33 and the driven spiral body 43 are located within the suction section 30a. The suction section 30a is separated from the scroll chamber 65 by the drive peripheral wall 35 and the cover body 37, and is also separated from the discharge chamber 14 by the drive end plate 31. The suction section 30a is also in communication with the suction port 374. As a result, the suction section 30a is in communication with the housing section 38 through the suction port 374.

[0087] Furthermore, by housing the driven scroll 40 within the driven scroll 30, the second front surface 371 of the wall portion 37a and the third rear surface 412 of the driven end plate 41 face each other in the direction of the drive axis O1. Each pivot pin 21 is positioned within each ring 22. In this way, the driven scroll 30 and the driven scroll 40 are assembled in the front-rear direction, and the driven scroll 30 and the driven scroll 40 constitute the scroll compression section 100. More precisely, after the driven spiral body 33 and the driven spiral body 43 are meshed and each pivot pin 21 is inserted into each ring 22, the cover body 37 of the driven scroll 30 is fixed to the drive peripheral wall 35 and the rotor 11.

[0088] Furthermore, when the drive scroll 30 and the driven scroll 40 are assembled, the housing recess 15 and driven shaft portion 16 of the driven end plate 41 face the recess 373 of the cover body 37.

[0089] As shown in Figure 2, the drive scroll 30 is positioned in front of the stator core 17a within the scroll chamber 65. In the drive scroll 30, the inner cylindrical portion 37b of the cover body 37 is inserted into the inner circumference of the first coil end 171. In this state, the first radial ball bearing 51 is inserted into the inner cylindrical portion 37b. As a result, the inner cylindrical portion 37b, and thus the cover body 37, is rotatably supported around the drive axis O1 with respect to the first diameter portion 641 of the protruding body 64 via the first radial ball bearing 51. The housing portion 38 is in communication with the scroll chamber 65. The front portion of the first diameter portion 641 is inserted into the insertion hole 375.

[0090] Here, since the cover body 37 is rotatably supported on the first diameter portion 641, in this compressor, the compression chamber 12, including the stator core 17a, is located forward of the electric motor 10 in the direction of the drive axis O1. More specifically, the compression chamber 12 is located forward of the electric motor 10 in the direction of the drive axis O1, with the cover body 37 and the driven end plate 41 in between. Also, in the one-sided elastic body 70, the second elastic bodies 70c and 70d are located closer to the compression chamber 12 in the direction of the drive axis O1 than the first elastic bodies 70a and 70b.

[0091] As described above, the first diameter portion 641 constitutes the front part of the projection 64, and the second diameter portion 642 constitutes the rear part of the projection 64. The stator core 17a is fixed to the outer circumferential surface of the second diameter portion 642. Therefore, the inner cylindrical portion 37b is rotatably supported on the first diameter portion 641 via the first radial ball bearing 51, so that the cover body 37 is rotatably supported on the projection 64 in front of the stator core 17a. In other words, the cover body 37 is supported on the projection 64 closer to the compression chamber 12 than the stator core 17a.

[0092] Furthermore, in the cover body 37, the inner cylindrical portion 37b faces the second diameter portion 642 in the direction of the drive axis O1. Here, with the cover body 37 rotatably supported by the protruding body 64, the inner cylindrical portion 37b and the first coil end 171 are separated in the radial direction of the housing 6.

[0093] Furthermore, because the cover body 37 is rotatably supported on the protruding body 64 in this manner, the wall portion 37a of the cover body 37 faces the first coil end 171 from the front. In addition, the outer cylindrical portion 37d of the cover body 37 is located outside the first coil end 171 in the radial direction of the cover body 37. At this time, the outer cylindrical portion 37d and the first coil end 171 are separated in the radial direction of the housing 6. In other words, because the cover body 37 is rotatably supported on the protruding body 64, the first coil end 171 is housed within the housing portion 38.

[0094] Furthermore, in this compressor, when the cover body 37 is rotatably supported by the protruding body 64, the first radial portion 641, the first radial ball bearing 51, the inner cylindrical portion 37b, the first coil end 171, and the outer cylindrical portion 37d are arranged in this order from the drive shaft center O1 side outward in the radial direction of the housing 6. These first radial portion 641, the first radial ball bearing 51, the inner cylindrical portion 37b, the first coil end 171, and the outer cylindrical portion 37d are arranged overlapping in the radial direction of the housing 6.

[0095] Furthermore, as shown in Figure 1, in the drive scroll 30, the boss 39d of the case 39 is inserted through the second radial ball bearing 52 and the shaft sealing member 63. As a result, the boss 39d is rotatably supported around the drive axis O1 with respect to the support portion 66 via the second radial ball bearing 52 and the other elastic body 67. In this way, the drive scroll 30 is positioned within the scroll chamber 65 and is rotatably supported around the drive axis O1 by both the protruding body 64 and the support portion 66 within the housing 6.

[0096] Furthermore, because the case 39 is supported by the support portion 66, the front end of the discharge passage 390 is connected to the rear end of the discharge connecting port 69. As a result, the discharge chamber 14 and the discharge connecting port 69 are in communication through the discharge passage 390. The shaft sealing member 63 then seals the space between the discharge passage 390 and the discharge connecting port 69 and the scroll chamber 65.

[0097] On the other hand, in the driven scroll 40, the driven pin 55 of the driven shaft portion 16 is inserted into the pin hole 4. As a result, the driven scroll 40 is positioned in front of the protruding body 64 and is rotatably supported around the driven axis O2 relative to the first diameter portion 641. Furthermore, by being rotatably supported on the first diameter portion 641 in this way, the driven scroll 40 is also rotatably supported on the protruding body 64 in front of the stator core 17a. In other words, the driven scroll 40 is rotatably supported around the driven axis O2 on the protruding body 64 on the compression chamber 12 side of the stator core 17a. Moreover, with the driven pin 55 inserted into the pin hole 4, the driven scroll 40 is rotatably supported around the driven axis O2 on the first diameter portion 641 in the radial direction of the housing 6, inside the inner cylindrical portion 37b. Unlike the drive scroll 30, the driven scroll 40 is supported by the housing 6 solely by the protruding body 64, allowing it to rotate around the driven axis O2.

[0098] Furthermore, in this compressor, the stator core 17a, the first radial ball bearing 51, and the bush 53 of the driven shaft portion 16 are arranged in this order from the first housing cover 61 side toward the compression chamber 12 side in the direction of the drive shaft center O1.

[0099] In this compressor configured as described above, as shown by the dashed arrows in Figures 1 and 2, low-temperature, low-pressure refrigerant that has passed through the evaporator is drawn into the scroll chamber 65 from the intake port 68. When the electric motor 10 operates and the rotor 11 rotates, the rotation of the rotor 11 is transmitted to the drive scroll 30, causing the drive scroll 30 to rotate around the drive axis O1 within the scroll chamber 65. In other words, the drive scroll 30 and the rotor 11 rotate together as a single unit. At this time, in the driven mechanism 20, each orbital pin 21 slides against the inner circumferential surface of each ring 22, causing each ring 22 to rotate relatively around the center of each orbital pin 21. In this way, the driven mechanism 20 transmits the torque of the drive scroll 30 to the driven scroll 40.

[0100] As a result, the driven scroll 40 is rotated by the drive scroll 30 and the driven mechanism 20 around the driven axis O2. At this time, the driven mechanism 20 restricts the driven scroll 40 from rotating on its own axis. This causes the driven scroll 40 to revolve relative to the drive scroll 30 around the driven axis O2. Then, as the drive volute 33 and the driven volute 43 rotate within the intake section 30a, the drive volute 33 and the driven volute 43 change the volume of the compression chamber 12.

[0101] Furthermore, the refrigerant drawn into the scroll chamber 65 flows between the rotor 11 and the stator 17, as shown by the dashed arrows in Figures 1 and 2, and reaches the housing section 38. The refrigerant drawn into the scroll chamber 65 also reaches the housing section 38 by flowing through slits formed in the stator core 17a. In addition, the refrigerant drawn into the scroll chamber 65 also reaches the housing section 38 by flowing through the gap between the slot (not shown) that houses the winding 17b formed in the stator core 17a and the winding 17b. In this way, the refrigerant in the housing section 38 is drawn into the compression chamber 12 from the intake port 374 through the intake section 30a.

[0102] The compression chamber 12 compresses the refrigerant by reducing its own volume while confining it within itself, through the rotational drive of the drive scroll 30 and the rotational movement of the driven scroll 40. The high-pressure refrigerant, thus compressed to the discharge pressure, is discharged from the discharge port 32 into the discharge chamber 14, and further discharged to the outside of the compressor via the discharge passage 390 and the discharge connecting port 69. In this compressor, the space between the discharge passage 390 and the discharge connecting port 69 and the scroll chamber 65 is sealed by the shaft sealing member 63, preventing the refrigerant flowing from the discharge passage 390 to the discharge connecting port 69 from flowing into the scroll chamber 65.

[0103] In this compressor, the stator core 17a is fixed to the second diameter portion 642 of the protruding body 64. Therefore, when this compressor is operating, torque fluctuations occur in the electric motor 10 due to the compression of the refrigerant in the compression chamber 12. As a result, vibrations caused by these torque fluctuations of the electric motor 10 are inevitably transmitted from the stator core 17a to the protruding body 64.

[0104] Furthermore, in this compressor, the inner cylindrical portion 37b of the cover body 37 is rotatably supported on the first diameter portion 641 of the protruding body 64. Therefore, in this compressor, during operation, vibrations of the drive scroll 30 due to the compression of the refrigerant in the compression chamber 12 are inevitably transmitted to the protruding body 64. Moreover, in this compressor, the driven scroll 40 is also rotatably supported on the first diameter portion 641, so during operation, vibrations of the driven scroll 40 due to the compression of the refrigerant in the compression chamber 12 are also inevitably transmitted to the protruding body 64.

[0105] Here, the frequency of vibrations generated during operation is not uniform. As a result, this compressor may generate a first vibration mode with a low vibration frequency and a second vibration mode with a higher vibration frequency than the first vibration mode during operation.

[0106] In this compressor, the protruding body 64 is attached to the first housing cover 61 via a one-sided elastic body 70. This one-sided elastic body 70 is composed of first elastic bodies 70a and 70b and second elastic bodies 70c and 70d. The first elastic bodies 70a and 70b are set to a first spring constant, while the second elastic bodies 70c and 70d are set to a second spring constant that is higher than the first spring constant. As a result, in the one-sided elastic body 70, the second elastic bodies 70c and 70d are less elastically deformable than the first elastic bodies 70a and 70b, while conversely, the first elastic bodies 70a and 70b are more elastically deformable than the second elastic bodies 70c and 70d.

[0107] In this way, in the one-sided elastic body 70, the second elastic bodies 70c and 70d become less elastically deformable, so that in this compressor, the vibration frequency can be increased by the second elastic bodies 70c and 70d during the first vibration mode, which has a low vibration frequency. As a result, the vibration frequency in the first vibration mode can be excluded from the range of the first rotational vibration, so that in this compressor, the transmission of low-frequency vibrations from the protruding body 64 to the first housing cover 61 and, consequently, to the housing 6 can be effectively suppressed.

[0108] Furthermore, in the one-sided elastic body 70, the first elastic bodies 70a and 70b become more elastically deformable, so that in the second vibration mode, which has a higher vibration frequency than the first vibration mode, the vibration frequency can be lowered by the first elastic bodies 70a and 70b. As a result, in this compressor, the transmission of high-frequency vibrations from the protruding body 64 to the housing 6 can be effectively suppressed.

[0109] In this way, the one-sided elastic body 70 effectively suppresses the transmission of both low-frequency and high-frequency vibrations from the protruding body 64 to the housing 6 in this compressor.

[0110] Furthermore, since the vibrations generated during operation are suppressed from being transmitted to the housing 6, this compressor does not require excessively high rigidity of the housing 6 in order to suppress vibrations of the housing 6 during operation. For this reason, the size of the housing 6 can also be kept down in this compressor.

[0111] Therefore, the compressor of Example 1 is excellent in terms of quietness and can be made smaller in size.

[0112] In particular, in this compressor, the second elastic bodies 70c and 70d are positioned further forward than the first elastic bodies 70a and 70b in the one-sided elastic body 70. Therefore, in the one-sided elastic body 70, the forward side, that is, the side closer to the compression chamber 12 in the direction of the drive axis O1, has the second spring constant, making it difficult to elastically deform. As a result, in this compressor, the one-sided elastic body 70 is able to suitably achieve the above-mentioned effects.

[0113] Furthermore, in the one-sided elastic body 70, the first elastic body 70a, the first elastic body 70b, the second elastic body 70c, and the second elastic body 70d are each formed separately, thus increasing the degree of freedom in the arrangement of the first elastic body 70b, the second elastic body 70c, and the second elastic body 70d. As a result, as described above, in the one-sided elastic body 70, it is possible to easily position the second elastic bodies 70c and 70d further forward than the first elastic bodies 70a and 70b.

[0114] Furthermore, the increased degree of freedom in the arrangement of the first elastic body 70b, the second elastic body 70c, and the second elastic body 70d makes it easy to set the distance in the direction of the drive axis O1 between the location having the first spring constant and the location having the second spring constant in the one-sided elastic body 70. In this respect as well, this compressor can effectively suppress the transmission of vibration from the protruding body 64 to the housing 6.

[0115] Furthermore, since the first elastic body 70a, the first elastic body 70b, the second elastic body 70c, and the second elastic body 70d are separate components, this compressor makes it possible to have different hardnesses for the first elastic body 70a and the first elastic body 70b and the second elastic body 70c and the second elastic body 70d. As a result, in this compressor, it is possible to easily set the first spring constant of the first elastic body 70a and the first elastic body 70b and the second spring constant of the second elastic body 70c and the second elastic body 70d based on the difference in hardness.

[0116] Furthermore, the one-sided elastic body 70 has two components, a first elastic body 70a and a first elastic body 70b, and two components, a second elastic body 70c and a second elastic body 70d. Therefore, in this compressor, compared to the case where the one-sided elastic body 70 is composed of a first elastic body 70a and a second elastic body 70c, it is possible to suitably suppress the transmission of vibration from the protruding body 64 to the housing 6.

[0117] As shown in Figures 3 and 4, in the compressor of Embodiment 2, a one-sided elastic body 71 is positioned between the radially protruding body 64 of the housing 6 and the holding portion 611. The one-sided elastic body 71 is also an example of an "elastic body" in the present invention. Furthermore, in this compressor, a stepped portion 611b is formed as a positioning portion relative to the holding portion 611, while holding grooves 81a to 81d are not formed.

[0118] As shown in Figure 4, the one-sided elastic body 71 is made of an elastically deformable resin such as synthetic rubber. The one-sided elastic body 71 is formed in a cylindrical shape and extends in the direction of the drive axis O1. The inner diameter of the one-sided elastic body 71 is formed to be approximately the same as the outer diameter of the retaining portion 611. More precisely, the inner diameter of the one-sided elastic body 71 is formed to be approximately the same as the outer diameter of the retaining portion 611 excluding the stepped portion 611b. The one-sided elastic body 71 may be made of a metal or the like with lower rigidity than the first housing cover 61.

[0119] One side of the elastic body 71 has a first thickness T1 in the radial direction of the housing 6 at its rear end, while the other side has a second thickness T2 in the radial direction of the housing 6 at its front end, which is greater than the first thickness T1. As a result, the front end of the elastic body 71 is thicker than the rear end. More specifically, the thickness of the elastic body 71 gradually increases from the first thickness T1 to the second thickness T2 as you move from the rear end to the front end. Consequently, the outer diameter of the elastic body 71 is smallest at the rear end and largest at the front end.

[0120] Here, the outer diameter of the one-sided elastic body 71 is larger than the inner diameter of the second diameter portion 642 of the protruding body 64, both at the rear end and the front end. In other words, the difference between the one-sided elastic body 71 and the inner diameter of the second diameter portion 642 is larger at the front end.

[0121] In the one-sided elastic body 71, the front end is the first elastic portion 71a, and the rear end is the second elastic portion 71b. That is, the radial thickness of the housing 6 in the first elastic portion 71a is the first thickness T1, and the radial thickness of the housing 6 in the second elastic portion 71b is the second thickness T2. Thus, the second elastic portion 71b is thicker than the first elastic portion 71a.

[0122] One side elastic body 71 is attached to the outer circumferential surface 611a of the retaining portion 611 by inserting the retaining portion 611 through its interior. Furthermore, the movement of the one side elastic body 71 toward the rear is restricted by contact with the stepped portion 611b. As a result, the one side elastic body 71 and the retaining portion 611 are positioned accordingly.

[0123] In this compressor, as shown by the white arrow in Figure 4, the protruding body 64 is moved backward, thereby housing the holding portion 611 and the one-sided elastic body 71 inside the second diameter portion 642. As a result, in this compressor as well, the holding portion 611 is positioned inside the second diameter portion 642.

[0124] Furthermore, as described above, since the outer diameter of the one-sided elastic body 71 is larger than the inner diameter of the second diameter portion 642, the one-sided elastic body 71 is positioned between the holding portion 611 and the second diameter portion 642 while elastically deforming in the radial direction of the housing 6. Here, since the second elastic portion 71b of the one-sided elastic body 71 is thicker than the first elastic portion 71a, the second elastic portion 71b undergoes greater elastic deformation between the holding portion 611 and the second diameter portion 642. In other words, the compression allowance in the second elastic portion 71b is larger than that in the first elastic portion 71a. Thus, in the one-sided elastic body 71, the first elastic portion 71a is set to the first spring constant, and the second elastic portion 71b is set to the second spring constant. In other words, in the one-sided elastic body 71, the thickness at the rear end is set to a first thickness T1 so that the first elastic portion 71a has a first spring constant, and the thickness at the front end is set to a second thickness T2 so that the second elastic portion 71b has a second spring constant.

[0125] Furthermore, the thickness of the one-sided elastic body 71 gradually increases from the first thickness T1 to the second thickness T2 as it moves from the rear end to the front end. As a result, the spring constant of the one-sided elastic body 71 gradually changes from the first spring constant to the second spring constant as it moves from the first elastic portion 71a to the second elastic portion 71b. And, since the second elastic portion 71b is located at the front end of the one-sided elastic body 71, the second elastic portion 71b is located closer to the compression chamber 12 in the direction of the drive axis O1 than the first elastic portion 71a (see Figure 3). The other components of this compressor are the same as those of the compressor in Embodiment 1, and the same reference numerals are used for the same components, and detailed explanations of the components are omitted.

[0126] In this compressor, in the elastic body 71 on one side, the second elastic portion 71b, which is set to a second spring constant, is less elastically deformable than the first elastic portion 71a, which is set to a first spring constant, while conversely, the first elastic portion 71a is more elastically deformable than the second elastic portion 71b. Thus, similar to the compressor in Embodiment 1, this compressor can effectively suppress the transmission of both low-frequency and high-frequency vibrations from the protruding body 64 to the housing 6.

[0127] Furthermore, in this compressor, the thickness of the first elastic section 71a and the thickness of the second elastic section 71b can be easily set to a first spring constant, and the thickness of the second elastic section 71b can be easily set to a second spring constant. In addition, in this compressor, the difference between the thickness of the first elastic section 71a and the thickness of the second elastic section 71b can be easily set to a difference between the first spring constant and the second spring constant.

[0128] As shown in Figures 5 and 6, in the compressor of Embodiment 3, a one-sided elastic body 72 is positioned between the radially protruding body 64 and the holding portion 611 of the housing 6. The one-sided elastic body 72 is also an example of an "elastic body" in the present invention.

[0129] As shown in Figure 6, the one-sided elastic body 72 is made of an elastically deformable resin such as synthetic rubber. The one-sided elastic body 72 consists of a base portion 72a, first elastic portions 72b and 72c, and second elastic portions 72d and 72e. The base portion 72a is formed in a cylindrical shape and extends in the direction of the drive axis O1. The inner diameter of the base portion 72a is formed to be approximately the same as the outer diameter of the holding portion 611 excluding the stepped portion 611b. Also, the outer diameter of the base portion 72a is formed to be smaller than the inner diameter of the second diameter portion 642 of the protruding body 64. The one-sided elastic body 72 may be made of a metal or the like with lower rigidity than the first housing cover 61.

[0130] The first elastic portions 72b and 72c are each integrally formed on the rear portion of the base 72a. The first elastic portions 72b and 72c protrude from the base 72a in a substantially semicircular shape toward the radially outward direction of the housing 6. Here, the height to which the first elastic portions 72b and 72c protrude from the base 72a is the first height H1. Furthermore, the first elastic portions 72b and 72c extend around the base 72a in a circumferential direction.

[0131] The second elastic portions 72d and 72e are each integrally formed with the front portion of the base 72a. Thus, in the one-sided elastic body 72, the first elastic portions 72b and 72c and the second elastic portions 72d and 72e are arranged at a distance from each other in the direction of the drive axis O1. Similar to the first elastic portions 72b and 72c, the second elastic portions 72d and 72e also protrude in a substantially semicircular shape from the base 72a toward the radially outward side of the housing 6. Here, the height to which the second elastic portions 72d and 72e protrude from the base 72a is a second height H2, which is higher than the first height H1. The second elastic portions 72d and 72e also extend around the base 72a in a circumferential direction. Thus, in the one-sided elastic body 72, the second elastic portions 72d and 72e are thicker than the first elastic portions 72b and 72c.

[0132] Furthermore, since the first elastic portions 72b, 72c and the second elastic portions 72d, 72e each protrude radially outward from the base portion 72a of the housing 6, the outer diameter of the first elastic portions 72b, 72c of the one-sided elastic body 72 is larger than the inner diameter of the second diameter portion 642. Similarly, in the one-sided elastic body 72, the outer diameter of the second elastic portions 72d, 72e is also larger than the inner diameter of the second diameter portion 642. And the outer diameter of the second elastic portions 72d, 72e is larger than the outer diameter of the first elastic portions 72b, 72c. For this reason, the difference between the inner diameter of the second diameter portion 642 and the outer diameter of the second elastic portions 72d, 72e is even larger.

[0133] One side elastic body 72 is attached to the outer circumferential surface 611a of the retaining portion 611 by inserting the retaining portion 611 inside the base portion 72a. Furthermore, the movement of the one side elastic body 72 toward the rear is restricted by the base portion 72a abutting against the stepped portion 611b. As a result, the positioning of the one side elastic body 72 and the retaining portion 611 is also performed in this compressor.

[0134] In this compressor, as shown by the white arrow in Figure 6, the protruding body 64 is moved backward, thereby housing the holding portion 611 and the one-sided elastic body 72 inside the second diameter portion 642. As a result, in this compressor as well, the holding portion 611 is positioned inside the second diameter portion 642.

[0135] Furthermore, in the one-sided elastic body 72, the first elastic portions 72b, 72c and the second elastic portions 72d, 72e are positioned between the holding portion 611 and the second radial portion 642, while elastically deforming in the radial direction of the housing 6. Here, the second elastic portions 72d, 72e protrude higher from the base portion 72a in the radial direction of the housing 6 than the first elastic portions 72b, 72c. Therefore, the second elastic portions 72d, 72e undergo greater elastic deformation between the holding portion 611 and the second radial portion 642. In other words, the compression allowance in the second elastic portions 72d, 72e is larger than that in the first elastic portions 72b, 72c. Thus, in the one-sided elastic body 72, the first elastic portions 72b, 72c are set to the first spring constant, and the second elastic portions 72d, 72e are set to the second spring constant. In other words, in the one-sided elastic body 72, the height to which the first elastic parts 72b and 72c protrude is set to a first height H1 so that the first elastic parts 72b and 72c have a first spring constant, and the height to which the second elastic parts 72d and 72e protrude is set to a second height H2 so that the second elastic parts 72d and 72e have a second spring constant.

[0136] Furthermore, since the second elastic portions 72d and 72e are formed in the front portion of the base portion 72a, the second elastic portions 72d and 72e are located closer to the compression chamber 12 in the direction of the drive axis O1 than the first elastic portions 72b and 72c. The other configurations of this compressor are the same as those of the compressor in Embodiment 2.

[0137] In this compressor, in the elastic body 72 on one side, the second elastic parts 72d and 72e, which are set to a second spring constant, are less elastically deformable than the first elastic parts 72b and 72c, which are set to a first spring constant. Conversely, the first elastic parts 72b and 72c are more elastically deformable than the second elastic parts 72d and 72e. Thus, this compressor can also perform the same function as the compressor in Example 1.

[0138] As shown in Figures 7 and 8, in the compressor of Embodiment 4, a protruding body 64a is attached to the first housing cover 61. In this compressor, a one-sided elastic body 73 is positioned between the protruding body 64a and the holding portion 611 in the radial direction of the housing 6. The one-sided elastic body 73 is also an example of an "elastic body" in the present invention.

[0139] The protruding body 64a is made of steel, similar to the protruding body 64. The protruding body 64a consists of a first diameter portion 641 and a second diameter portion 643. The second diameter portion 643 extends in the direction of the drive axis O1 and is an example of a "cylindrical portion" in the present invention.

[0140] Similar to the second diameter portion 642, the second diameter portion 643 is also formed as a bottomed cylindrical shape with an opening at the rear, and is integral with the first diameter portion 641 at its front end. As a result, the second diameter portion 643 constitutes the rear part of the projection 64a. The outer diameter of the second diameter portion 643 is formed to be the same as the outer diameter of the second diameter portion 642.

[0141] The inner diameter of the second diameter portion 643 is formed to be larger than that of the holding portion 611. Here, the inner diameter of the second diameter portion 643 gradually decreases as you move from the first housing cover 61 side toward the drive scroll 30 and driven scroll 40 side in the direction of the drive axis O1, that is, as you move from the rear side toward the front side in the direction of the drive axis O1. Specifically, as shown in Figure 8, in the second diameter portion 643, the length of the inner diameter at the rear end is the first length L1. Then, in the second diameter portion 643, as you move forward from the rear end toward the drive axis O1, the length of the inner diameter gradually decreases from the first length L1 to the second length L2.

[0142] The one-sided elastic body 73 is made of an elastically deformable resin such as synthetic rubber. The one-sided elastic body 73 is formed in a cylindrical shape and extends in the direction of the drive axis O1. The inner diameter of the one-sided elastic body 73 is formed to be approximately the same as the outer diameter of the holding portion 611. The one-sided elastic body 73 may be made of a metal or the like that has lower rigidity than the first housing cover 61.

[0143] In the one-sided elastic body 73, the rear end is designated as the first elastic portion 73a, and the front end as the second elastic portion 73b. Furthermore, the one-sided elastic body 73 is formed to gradually become thinner as it moves from the rear to the front in the direction of the drive axis O1. Specifically, in the one-sided elastic body 73, the thickness at the rear end is set to the third thickness T3, and the rear end, i.e., the first elastic portion 73a, is the thickest. Then, in the one-sided elastic body 73, the inner thickness gradually decreases as it moves from the rear end towards the front in the direction of the drive axis O1, and the thickness at the front end, i.e., the second elastic portion 73b, is thinner than the third thickness T3 and is the thinnest fourth thickness T4 in the one-sided elastic body 73. Due to this change in thickness, the one-sided elastic body 73 inserted into the holding portion 611 has a tapered shape in which the length of the outer diameter gradually decreases from the third length L3 to the fourth length L4 as it moves from the rear end to the front end in the direction of the drive axis O1. The third length L3 is slightly longer than the first length L1, and the fourth length L4 is slightly longer than the second length L2.

[0144] In this compressor as well, as shown by the white arrow in Figure 8, the holding portion 611 and the one-sided elastic body 73 are housed inside the second diameter portion 643 by moving the protruding body 64a toward the rear. As a result, the protruding body 64a is attached to the first housing cover 61 via the one-sided elastic body 73, and the holding portion 611 and the one-sided elastic body 73 are positioned inside the second diameter portion 643.

[0145] In this compressor, the one-sided elastic body 73 is positioned between the holding portion 611 and the second diameter portion 643, while elastically deforming in the radial direction of the housing 6. As described above, the inner diameter of the second diameter portion 643 gradually decreases as it moves from the rear to the front in the direction of the drive axis O1. On the other hand, the one-sided elastic body 73 is formed to become progressively thinner as it moves from the rear to the front in the direction of the drive axis O1. As a result, the compression allowance of the one-sided elastic body 73 is almost constant from the rear end to the front end. Consequently, in the one-sided elastic body 73, the first elastic portion 73a, which is the thickest, is set to the first spring constant, and the second elastic portion 73b, which is the thinnest, is set to the second spring constant. Furthermore, in the one-sided elastic body 73, the spring constant gradually changes from the first to the second spring constant as it moves from the first elastic portion 73a to the second elastic portion 73b.

[0146] Furthermore, as shown in Figure 7, the stator core 17a is fixed to the outer circumferential surface of the second diameter portion 643 of the protruding body 64a. Also, similar to the protruding body 64, the protruding body 64a rotatably supports the drive scroll 30 and the driven scroll 40, respectively. In addition, since the front end of the one-sided elastic body 73 becomes the second elastic portion 73b, in this compressor as well, the second elastic portion 73b is located closer to the compression chamber 12 in the direction of the drive axis O1 than the first elastic portion 73a. The other configurations of this compressor are the same as those of the compressor in Embodiment 2.

[0147] In this compressor, in the elastic body 73 on one side, the second elastic portion 73b, which is set to a second spring constant, is less elastically deformable than the first elastic portion 73a, which is set to a first spring constant. Conversely, the first elastic portion 73a is more elastically deformable than the second elastic portion 73b. Thus, this compressor can also perform the same function as the compressor in Example 1.

[0148] Although the present invention has been described above in reference to Examples 1 to 4, it goes without saying that the present invention is not limited to Examples 1 to 4, and can be applied with appropriate modifications without departing from its spirit.

[0149] For example, in the compressor of Example 1, the one-sided elastic body 70 is composed of two first elastic bodies 70a and 70b and two second elastic bodies 70c and 70d. However, it is not limited to this, and the one-sided elastic body 70 may be composed of a first elastic body 70a and a second elastic body 70c. Furthermore, the one-sided elastic body 70 may have a first elastic body in addition to the first elastic bodies 70a and 70b, and a second elastic body in addition to the second elastic bodies 70c and 70d. Moreover, the number of first elastic bodies and the number of second elastic bodies may be different. The same applies to the compressor of Example 3.

[0150] Furthermore, in the compressor of Example 1, the first elastic bodies 70a and 70b may be positioned closer to the compression chamber 12 in the direction of the drive axis O1 than the second elastic bodies 70c and 70d. The same applies to the compressors of Examples 2 to 4.

[0151] Furthermore, in the compressor of Embodiment 1, the holding portion 611 is integrally formed with the first housing cover 61. However, the design is not limited to this, and the holding portion 611 and the first housing cover 61 may be formed separately, with the holding portion 611 fixed to the first housing cover 61. In this case, it is also easy to form the holding portion 611 and the first housing cover 61 from different materials. The same applies to the compressors of Embodiments 2 to 4.

[0152] Furthermore, in the compressor of Example 1, the first diameter portion 641 and the second diameter portion 642 of the protruding body 64 are formed integrally. However, the compressor is not limited to this configuration, and the first diameter portion 641 and the second diameter portion 642 may be formed separately, with the first diameter portion 641 fixed to the second diameter portion 642. Alternatively, the protruding body 64 may have only the second diameter portion 642. The same applies to the compressors of Examples 2 to 4.

[0153] Furthermore, in the compressor of Example 1, the housing 6 is composed of a housing body 60, a first housing cover 61, and a second housing cover 62. However, the housing 6 is not limited to this configuration and may have other configurations. The same applies to the compressors of Examples 2 to 4.

[0154] Furthermore, this specification includes the following inventions. (Note 1) A double-rotation scroll compressor comprising a housing, a drive scroll, a driven scroll, a drive mechanism and a driven mechanism, wherein the housing has a scroll chamber in which the drive scroll, the driven scroll and the drive mechanism are housed, the drive mechanism has a stator and a rotor that is rotationally driven by the stator, the drive scroll is rotationally driven around a drive axis by the drive mechanism, the driven scroll is rotationally driven around a driven axis by the drive scroll and the driven mechanism while being eccentric with respect to the drive scroll, and the drive scroll and the driven scroll form a compression chamber for compressing fluid by the rotational drive and the rotational drive, wherein the stator is fixed inside the scroll chamber and a projection is provided extending in the direction of the drive axis toward the drive scroll and the driven scroll, the drive scroll is rotatably supported by the projection around the drive axis, the driven scroll is rotatably supported by the projection around the driven axis, and the projection is attached to the housing via an elastically deformable elastic body. A double-rotation scroll compressor characterized in that the elastic body has a first elastic portion set to a first spring constant and a second elastic portion set to a second spring constant higher than the first spring constant. (Note 2) The double-rotation scroll compressor according to Note 1, wherein the second elastic portion is located closer to the compression chamber in the drive axis direction than the first elastic portion. (Note 3) The double-rotation scroll compressor according to Note 1 or 2, wherein the housing has a holding portion that extends in the drive axis direction and is located inside the protruding body, and the elastic body is located between the holding portion and the protruding body. (Note 4) The double-rotation scroll compressor according to any one of Notes 1 to 3, wherein the first elastic portion and the second elastic portion are each multiple. (Note 5) The double-rotation scroll compressor according to any one of Notes 1 to 4, wherein the first elastic portion and the second elastic portion are formed as separate parts. (Note 6) The double-rotation scroll compressor according to any one of Notes 1 to 5, wherein the second elastic portion is formed to be thicker than the first elastic portion.(Note 7) The double-rotating scroll compressor according to Note 3, wherein the protruding body has a cylindrical portion that extends in the direction of the drive axis and in which the holding portion and the elastic body are disposed, the elastic body is cylindrical in shape and extends in the direction of the drive axis and is inserted through the holding portion, the inner diameter of the cylindrical portion gradually decreases in the direction of the drive axis from the housing side toward the drive scroll and the driven scroll, the elastic body is formed to become progressively thinner in the direction of the drive axis from the housing side toward the drive scroll and the driven scroll, the end of the elastic body toward the housing side is the first elastic portion, and the end of the elastic body toward the drive scroll and the driven scroll is the second elastic portion.

[0155] This invention can be used in vehicle air conditioning systems and the like.

[0156] 6 Housing 10 Electric motor (drive mechanism) 11 Rotor 12 Compression chamber 17 Stator 20 Driven mechanism 30 Driven scroll 40 Driven scroll 64, 64a Projection 65 Scroll chamber 70-73 One-sided elastic body (elastic body) 70a, 70b First elastic body (first elastic part) 70c, 70d Second elastic body (second elastic part) 71a First elastic part 71b Second elastic part 72b, 72c First elastic part 72d, 72e Second elastic part 73a First elastic part 73b Second elastic part 611 Holding part 643 Second diameter part (cylindrical part) O1 Drive shaft center O2 Driven shaft center

Claims

1. A double-rotation scroll compressor comprising a housing, a drive scroll, a driven scroll, a drive mechanism, and a driven mechanism, wherein the housing has a scroll chamber in which the drive scroll, the driven scroll, and the drive mechanism are housed, the drive mechanism has a stator and a rotor that is rotationally driven by the stator, the drive scroll is rotationally driven around a drive axis by the drive mechanism, the driven scroll is rotationally driven around a driven axis by the drive scroll and the driven mechanism while being eccentric with respect to the drive scroll, and the drive scroll and the driven scroll form a compression chamber for compressing fluid by the rotational drive and the rotational drive, wherein the stator is fixed inside the scroll chamber and a projection is provided extending in the direction of the drive axis toward the drive scroll and the driven scroll, the drive scroll is rotatably supported by the projection around the drive axis, the driven scroll is rotatably supported by the projection around the driven axis, and the projection is attached to the housing via an elastically deformable elastic body. The aforementioned elastic body is characterized by having a first elastic portion set to a first spring constant and a second elastic portion set to a second spring constant higher than the first spring constant, and is a double-rotation scroll type compressor.

2. The double-rotation scroll compressor according to claim 1, wherein the second elastic portion is located closer to the compression chamber in the direction of the drive axis than the first elastic portion.

3. The double-rotation scroll compressor according to claim 1 or 2, wherein the housing has a retaining portion that extends in the direction of the drive axis and is disposed inside the protruding body, and the elastic body is disposed between the retaining portion and the protruding body.

4. The double-rotation scroll compressor according to claim 1 or 2, wherein the first elastic section and the second elastic section are each a plurality.

5. The double-rotation scroll compressor according to claim 1 or 2, wherein the first elastic part and the second elastic part are formed separately.

6. The double-rotation scroll compressor according to claim 1 or 2, wherein the second elastic portion is formed to be thicker than the first elastic portion.

7. The double-rotating scroll compressor according to claim 3, wherein the protruding body has a cylindrical portion extending in the direction of the drive axis and in which the holding portion and the elastic body are disposed, the elastic body is cylindrical in shape extending in the direction of the drive axis and inserted through the holding portion, the inner diameter of the cylindrical portion gradually decreases in the direction of the drive axis from the housing side toward the drive scroll and the driven scroll, the elastic body is formed to become progressively thinner in the direction of the drive axis from the housing side toward the drive scroll and the driven scroll, the end of the elastic body toward the housing side is the first elastic portion, and the end of the elastic body toward the drive scroll and the driven scroll is the second elastic portion.

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