Co-rotating scroll compressor

Abstract

This compressor comprises a housing (6), a drive mechanism (10), a drive scroll (30), a driven scroll (40), a driven mechanism (20), and a discharge chamber (14). The drive scroll (30) and the driven scroll (40) form a compression chamber (12). A refrigerant compressed in the compression chamber (12) is discharged to the discharge chamber (14). A protruding body (64) is provided in the housing (6). The drive scroll (30) has a cover body (37), and the cover body (37) is rotatably supported on the protruding body (64) through an axial support part (51). A recirculation passage (37c) that communicates with the discharge chamber (14) and causes lubricating oil (18) in the discharge chamber (14) to flow toward the protruding body (64) is formed in the cover body (37). A connection passage (5) is formed in the protruding body (64). The connection passage (5) is located inward of the axial support part (51) in a radial direction of the protruding body (64), and communicates with the recirculation passage (37c).

Description

Double-rotating scroll compressor

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

[0002] Patent Document 1 discloses a conventional double-rotating scroll compressor (hereinafter simply referred to as a compressor). This compressor includes a housing, a drive mechanism, a drive scroll, a driven scroll, a driven mechanism, and a discharge chamber. The housing has a scroll chamber that houses the drive mechanism, the drive scroll, and the driven scroll. Refrigerant is drawn into the scroll chamber from outside the housing.

[0003] The drive mechanism has a stator and a rotor. The stator is fixed within the scroll chamber. The drive scroll has a cover body. The cover body has a cylindrical extension portion. The rotor is fixed to the outer peripheral surface of the extension portion. The driven scroll is eccentric with respect to the drive scroll and can be rotated by the drive scroll and the driven mechanism around the driven axis. The drive scroll and driven scroll form a compression chamber that compresses the refrigerant by rotational driving and rotational following. A discharge chamber is formed in the driven scroll and is in communication with the compression chamber.

[0004] In this compressor, a protrusion is provided on the housing. The protrusion protrudes into the scroll chamber in the drive axial direction toward the drive scroll and the driven scroll. The protrusion extends into the extension portion. A journal is provided between the inner peripheral surface of the extension portion and the outer peripheral surface of the protrusion. Thus, the drive scroll is rotatably supported by the protrusion via the journal.

[0005] A discharge passage is formed inside the protrusion and extends in the drive shaft direction. The discharge passage communicates with the discharge chamber on one side in the drive shaft direction and with the outside of the housing on the other side in the drive shaft direction.

[0006] In this compressor, as the rotor rotates in the drive mechanism, the drive scroll rotates integrally with the rotor about the drive axis. As a result, the driven scroll is rotated about the driven axis by the drive scroll and the driven mechanism. The volume of the compression chamber changes depending on the rotationally driven drive scroll and the rotationally driven driven scroll. As a result, in this compressor, refrigerant is drawn into the compression chamber and compressed. The refrigerant compressed in the compression chamber is discharged into the discharge chamber, and then flows from the discharge chamber through a discharge passage and is discharged to the outside of the housing, i.e., the outside of the compressor.

[0007] Japanese Unexamined Patent Publication No. 2-227575

[0008] In this type of compressor, sufficient lubrication is required for the bearing portion to ensure proper rotation of the drive scroll. Here, the refrigerant drawn into the compression chamber contains lubricating oil, and this lubricating oil is discharged from the compression chamber to the discharge chamber together with the refrigerant compressed in the compression chamber. Therefore, it is considered to use such lubricating oil to lubricate the bearing portion.

[0009] However, in the conventional compressor, most of the lubricating oil discharged into the discharge chamber flows through the discharge passage together with the refrigerant and is discharged to the outside of the compressor. As a result, the lubricating oil discharged into the discharge chamber cannot be used sufficiently to lubricate the bearing part. As a result, there is a concern that the durability of such a compressor will be reduced due to insufficient lubrication of the bearing part.

[0010] The present invention has been made in view of the above-mentioned conventional circumstances, and an object to be achieved is to provide a double-rotation scroll compressor having excellent durability.

[0011] The double-rotating scroll compressor of the present invention comprises a housing, a drive mechanism, a driving scroll, a driven scroll, a driven mechanism, and a discharge chamber, wherein the housing has a scroll chamber in which the driving scroll and the driven scroll are accommodated, wherein the driving scroll is rotationally driven about a drive axis by the drive mechanism, and the driven scroll is rotationally driven by the driving scroll and the driven mechanism about a driven axis while being eccentric with respect to the driving scroll, wherein the driving scroll and the driven scroll form a compression chamber that compresses a refrigerant by the rotational driving and the rotational driven, and wherein the refrigerant compressed in the compression chamber is discharged into the discharge chamber, wherein a protrusion is provided within the housing that protrudes into the scroll chamber in the drive axis direction toward the driving scroll and the driven scroll, and the driving scroll has a cover body rotatably supported by the protrusion body via a bearing portion, and a return passage is formed in the cover body that is in communication with the discharge chamber and that circulates lubricating oil in the discharge chamber toward the protrusion body, The protrusion has a connecting passage formed therein that is located radially inward of the support portion and communicates with the return passage, and the housing has a lubricating oil passage formed therein that is located radially inward of the drive mechanism and communicates with the connecting passage, allowing the lubricating oil to flow.

[0012] In the double-rotating scroll compressor of the present invention, the drive scroll has a cover body, and the cover body is rotatably supported by the protruding body via a bearing part. In this compressor, refrigerant compressed in the compression chamber is discharged to the discharge chamber. Here, the refrigerant discharged to the discharge chamber contains lubricating oil.

[0013] In this compressor, a return passage formed in the cover body allows lubricating oil in the discharge chamber to flow toward the protruding body. Furthermore, a connecting passage is formed in the protruding body. A lubricating oil passage that communicates with the connecting passage is formed inside the housing, radially inward of the drive mechanism. This allows the lubricating oil that has flowed through the return passage to flow back to the lubricating oil passage via the connecting passage. This prevents the lubricating oil in the discharge chamber from being discharged from the discharge chamber to the outside of the compressor along with the refrigerant.

[0014] In this compressor, the connecting passage in the protruding body is located radially inward of the support portion. Therefore, the lubricating oil in the return passage flows from the return passage to the connecting passage radially inward of the support portion. This allows the lubricating oil flowing from the return passage to the connecting passage to effectively lubricate the support portion. This effectively prevents insufficient lubrication of the support portion. Furthermore, in this compressor, the lubricating oil flowing from the return passage through the connecting passage to the lubricating oil passage can be used to lubricate the drive scroll, driven scroll, etc.

[0015] Therefore, the double-rotating scroll compressor of the present invention has excellent durability.

[0016] The driven scroll may have a driven shaft supported by the protruding body radially inward of the support portion. The driven shaft preferably has a shaft passage that communicates with the return passage and the lubricating oil passage and through which the lubricating oil can flow. In this case, the driven shaft can also be suitably lubricated by the lubricating oil.

[0017] In this case, the driven shaft is preferably inserted into the connecting passage, which simplifies the configuration of the protrusion and allows the protrusion to favorably support the driven shaft.

[0018] It is preferable that the protrusion has a first diameter portion in which the cover body is supported via the support portion and in which a connecting passage is formed, and a second diameter portion which is larger in diameter than the first diameter portion and in which a lubricating oil passage is formed.

[0019] In this case, the rigidity of the protrusion can be ensured by the second diameter portion. Also, a lubricating oil passage can be easily formed in the second diameter portion. Furthermore, since the first diameter portion is smaller than the second diameter portion, the compressor can prevent the bearing portion from becoming large.

[0020] The lubricating oil passage is preferably capable of storing lubricating oil therein, so that the lubricating oil in the lubricating oil passage can be more easily utilized for lubricating the driving scroll, the driven scroll, and the like.

[0021] The double-rotating scroll compressor of the present invention is excellent in durability.

[0022] Fig. 1 is a cross-sectional view of a compressor according to a first embodiment. Fig. 2 is an enlarged cross-sectional view of a main part of the compressor according to the first embodiment, showing a return passage, a connecting passage, a lubricating oil passage, etc. Fig. 3 is an enlarged cross-sectional view of a main part of a compressor according to a second embodiment, similar to Fig. 2, showing a return passage, a connecting passage, a lubricating oil passage, etc.

[0023] Hereinafter, first and second embodiments of the present invention will be described with reference to the drawings. The rotary scroll compressors of the first and second embodiments are mounted on a vehicle (not shown) and form an air conditioning system for the vehicle.

[0024] 1, the compressor of the first embodiment includes a housing 6, an electric motor 10, a driving scroll 30, a driven scroll 40, a driven mechanism 20, and a discharge chamber 14. The electric motor 10 is an example of the "drive mechanism" of the present invention.

[0025] In this embodiment, the front-rear direction and the up-down direction of the compressor are defined by solid arrows shown in Figure 1. Furthermore, in Figure 2 and subsequent figures, the front-rear direction and the up-down direction of the compressor are defined in accordance with Figure 1. The front-rear direction and the up-down direction are perpendicular to each other. Furthermore, when this compressor is mounted on a vehicle, gravity acts from above to below the plane of the page in Figure 1, etc. Note that these front-rear directions and the like are merely examples for the sake of convenience, and the compressor's position can be changed as appropriate depending on the vehicle in which it is mounted.

[0026] 1, the housing 6 is made up of a housing body 60 and a housing cover 62. The housing body 60 and the housing cover 62 are made of an aluminum alloy.

[0027] The housing body 60 is a cylindrical member having an outer peripheral wall 60a and a rear wall 60b. The outer peripheral wall 60a is cylindrical and has a drive axis O1 as its center. The drive axis O1 is parallel to the front-rear direction.

[0028] An intake communication port 68 is formed in the outer peripheral wall 60a. The intake communication port 68 extends in the radial direction of the housing body 60. The intake communication port 68 is connected to an evaporator (not shown) through a pipe (not shown).

[0029] The rear wall 60b is located at the rear end of the housing main body 60. The rear wall 60b extends in a generally circular, flat plate shape perpendicular to the drive axis O1. The outer peripheral edge of the rear wall 60b is connected to the rear end of the outer peripheral wall 60a. The rear wall 60b also has a mounting recess 60c formed therein. The mounting recess 60c is recessed from the front to the rear on the inner surface of the rear wall 60b.

[0030] A protrusion 64 is provided inside the housing 6. More specifically, the protrusion 64 is provided inside the housing main body 60. The protrusion 64 is made of steel. The protrusion 64 has a first diameter portion 64a and a second diameter portion 64b. The first diameter portion 64a and the second diameter portion 64b are integrally formed. The protrusion 64 may also be made of an aluminum alloy.

[0031] The first diameter portion 64a constitutes the front portion of the protrusion 64. The first diameter portion 64a is formed in a generally cylindrical shape extending in the drive shaft direction. The first diameter portion 64a is formed to have a smaller diameter than the insertion hole 37d (described later). The pin hole 4 and the connecting passage 5 are formed in the first diameter portion 64a.

[0032] The pin hole 4 and the connecting passage 5 are disposed at a distance from each other. The pin hole 4 and the connecting passage 5 each open to the front end surface of the first diameter portion 64a. The pin hole 4 is formed with a larger diameter than the connecting passage 5. The pin hole 4 is recessed from the front end surface toward the rear within the first diameter portion 64a. As a result, the pin hole 4 does not pass through the first diameter portion 64a in the direction of the drive axis O1. In contrast, the connecting passage 5 passes through the first diameter portion 64a in the direction of the drive axis O1. The pin hole 4 and the connecting passage 5 may be formed with the same diameter, or the connecting passage 5 may be formed with a larger diameter than the pin hole 4.

[0033] A first plain bearing 51 is provided on the outer peripheral surface of the first diameter portion 64a. The first plain bearing 51 is an example of the "bearing portion" in the present invention. Note that instead of the first plain bearing 51, a ball bearing may be provided on the outer peripheral surface of the first diameter portion 64a.

[0034] The second diameter portion 64b is located rearward of the first diameter portion 64a and constitutes the rear portion of the protrusion 64. The second diameter portion 64b is formed to have a larger diameter than the first diameter portion 64a. The second diameter portion 64b is made up of a main body portion 641 and a flange portion 642. The main body portion 641 constitutes the front portion of the second diameter portion 64b, and the flange portion 642 constitutes the rear portion of the second diameter portion 64b.

[0035] The main body portion 641 is coaxial with the first diameter portion 64a and extends in the direction of the drive axis O1. The main body portion 641 is connected to the first diameter portion 64a. The flange portion 642 has a larger diameter than the main body portion 641 and extends outward from the main body portion 641 in the radial direction of the second diameter portion 64b.

[0036] The second diameter portion 64b is formed with an oil reservoir 3, a first communication passage 7, a discharge passage 8, and a second communication passage 9. The oil reservoir 3 is an example of a "lubricating oil passage" in the present invention. As described above, the protrusion 64 is provided inside the housing 6. Therefore, the oil reservoir 3 is formed in the second diameter portion 64b, and thus the oil reservoir 3 is formed inside the housing 6. Inside the housing 6, the oil reservoir 3 is located radially inward of the electric motor 10.

[0037] The oil reservoir 3 opens at the rear end surface of the flange portion 642, i.e., at the rear end of the second diameter portion 64b. The oil reservoir 3 is recessed from the rear end surface of the flange portion 642 toward the front in the direction of the drive axis O1 inside the main body portion 641 and the flange portion 642. The oil reservoir 3 has a diameter larger than the pin hole 4 and the connecting passage 5, and is connected to the connecting passage 5. On the other hand, the oil reservoir 3 is not connected to the pin hole 4.

[0038] The first communication passage 7 has a smaller diameter than the oil reservoir 3, extends inside the main body portion 641 and the flange portion 642 in the direction of the drive axis O1, and opens at the front end face of the main body portion 641. Here, the first communication passage 7 is disposed radially outward of the second diameter portion 64b than the oil reservoir 3, and is not in communication with the oil reservoir 3. The first communication passage 7 is recessed rearward from the front end of the second diameter portion 64b, and does not pass through the flange portion 642. In other words, the oil reservoir 3 and the first communication passage 7 are recessed in opposite directions relative to the second diameter portion 64b in the direction of the drive axis O1.

[0039] The discharge passage 8 is formed in the main body portion 641 and is disposed at a location radially inward of the second diameter portion 64b relative to the first communication passage 7. The discharge passage 8 penetrates the main body portion 641 in the direction of the drive axis O1. As a result, the front end of the discharge passage 8 opens at the front end surface of the main body portion 641 and the rear end thereof communicates with the oil reservoir chamber 3.

[0040] The second communication passage 9 is formed in the flange portion 642. The second communication passage 9 extends radially of the second diameter portion 64b inside the flange portion 642. As a result, one end of the second communication passage 9 is connected to the rear portion of the first communication passage 7, and the other end opens to the outer peripheral surface of the flange portion 642.

[0041] The protrusion 64 is fixed to the rear wall 60b by fitting the flange portion 642 into the mounting recess 60c. Thus, the rear end of the oil reservoir 3 of the protrusion 64 is closed by the rear wall 60b.

[0042] The housing cover 62 is disposed in front of the housing main body 60. The housing cover 62 is generally disk-shaped and centered on the drive axis O1. The housing cover 62 has a front surface 62a facing forward and a rear surface 62b facing rearward and located on the opposite side of the front surface 62a.

[0043] The housing cover 62 also has a support portion 66 and a discharge communication port 69. The support portion 66 is integrally formed approximately at the center of the 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 axis O1, and is provided with a ball bearing 52 and a shaft seal member 63 inside. The ball bearing 52 is an example of the "bearing" in the present invention. Note that a sliding bearing may be provided inside the support portion 66 instead of the ball bearing 52.

[0044] The shaft seal member 63 is disposed inside the support portion 66 and forward of the ball bearing 52. The shaft seal member 63 is formed in an annular shape.

[0045] The discharge communication port 69 penetrates the housing cover 62 in the direction of the drive axis O1 and communicates with the inside of the support portion 66. The discharge communication port 69 is also connected to a condenser (not shown) through piping (not shown).

[0046] In the housing 6, the rear surface 62b of the housing cover 62 abuts against the front end of the outer peripheral wall 60a of the housing main body 60. In this state, the housing cover 62 is fixed to the housing main body 60 with a plurality of bolts (not shown) from the housing cover 62 side. In this way, in the housing 6, the housing main body 60 and the housing cover 62 are integrated.

[0047] In the housing 6, the front of the housing body 60 is closed by the housing cover 62, thereby forming a scroll chamber 65 inside the housing body 60. The scroll chamber 65 communicates with the suction communication port 68. As a result, refrigerant is drawn into the scroll chamber 65 from outside the housing 6 through the suction communication port 68. This refrigerant contains lubricating oil 18.

[0048] Furthermore, the above-mentioned protrusion 64 is fixed to the rear wall 60b, and thereby protrudes from the rear wall 60b in the direction of the drive axis O1 into the scroll chamber 65. More specifically, the protrusion 64 protrudes forward from the rear wall 60b toward the driving scroll 30 and the driven scroll 40. The second diameter portion 64b of the protrusion 64 separates the scroll chamber 65 from the oil storage chamber 3.

[0049] In addition, in the protrusion 64, the other end of the second communication passage 9 communicates with the scroll chamber 65. In this case, the other end of the second communication passage 9 faces downward from the scroll chamber 65. As a result, the other end of the second communication passage 9 communicates with a location in the scroll chamber 65 that is lower in the direction of gravity than the second diameter portion 64b.

[0050] The electric motor 10 is accommodated in the scroll chamber 65. As a result, the scroll chamber 65 also serves as a motor chamber that accommodates the electric motor 10.

[0051] The electric motor 10 is composed of a stator 17 and a rotor 11. The stator 17 is cylindrical and has a drive shaft O1 as its center, and has windings 17a. The stator 17 is fixed to the housing main body 60 and, by extension, the housing 6, by fitting into the inner peripheral surface of the outer peripheral wall 60a.

[0052] The rotor 11 is cylindrical around the drive axis O1 and is disposed inside the stator 17. Although not shown in detail, the rotor 11 has a plurality of permanent magnets corresponding to the stator 17 and laminated steel plates that secure the permanent magnets.

[0053] The driving scroll 30 is made of a metal such as an aluminum alloy and is housed in a scroll chamber 65. The driving scroll 30 includes a driving end plate 31, a driving scroll 33, a driving peripheral wall 35, a cover body 37, and a case 39.

[0054] The drive end plate 31 extends in a generally disk-like 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 to the front-to-rear direction. The drive end plate 31 has a first front surface 311 facing forward and a first rear surface 312 located opposite the first front surface 311 and facing rearward.

[0055] 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. A discharge reed valve 57 and a retainer 58 are fixed to the first front surface 311 of the drive end plate 31 with fixing bolts 59. This allows the discharge reed valve 57 to open and close the discharge port 32. The retainer 58 can adjust the opening degree of the discharge reed valve 57.

[0056] The drive scroll 33 is integral with the drive end plate 31 and protrudes rearward from the first rear surface 312, i.e., parallel to the drive axis O1 and the driven axis O2, toward the driven scroll 40. Although not shown in detail, the drive scroll 33 has a spiral center located on the central side of the drive end plate 31 and protrudes outward from the spiral center in a spiral shape.

[0057] The drive circumferential wall 35 is formed in a cylindrical shape centered on the drive axis O1 and extending parallel to the drive axis O1 and the driven axis O2. The front end of the drive circumferential wall 35 is integral with the outer periphery of the drive end plate 31. As a result, the drive circumferential wall 35 surrounds the drive scroll 33 from the outside and protrudes cylindrically rearward from the first rear surface 312. Although not shown, the outer periphery of the drive scroll 33 is connected to the inner periphery of the drive circumferential wall 35.

[0058] A first supply passage 35a is formed in the drive end plate 31 and the drive peripheral wall 35. The first supply passage 35a penetrates the drive end plate 31 and the drive peripheral wall 35 in the direction of the drive axis O1. As a result, the front end of the first supply passage 35a opens at the first front surface 311 of the drive end plate 31. The rear end of the first supply passage 35a opens at the rear end surface of the drive peripheral wall 35.

[0059] The cover body 37 is composed of a cover main body portion 37a and an extension portion 37b. The cover main body portion 37a extends in a generally disk-like shape, perpendicular to the drive axis O1 and the driven axis O2. The cover main body portion 37a is formed to have generally the same diameter as the drive end plate 31 and the drive peripheral wall 35. The cover main body portion 37a has a second front surface 371 facing forward and a second rear surface 372 facing rearward, located on the opposite side of the second front surface 371.

[0060] The cover body 37a is formed with a return passage 37c, an insertion hole 37d, a suction passage 37e, and a first bolt hole 37f.

[0061] The return passage 37c is composed of a recess 373 and a passage body 374. As shown in FIG. 2 , the recess 373 is located approximately in the center of the second front face 371 and is recessed rearward from the second front face 371. One end of the passage body 374 opens to the second front face 371. The passage body 374 extends inside the cover body 37a and has the other end opening into the recess 373.

[0062] The insertion hole 37d penetrates the cover main body 37a in the direction of the drive axis O1. The insertion hole 37d is formed in a cylindrical shape centered on the drive axis O1, and its front end communicates with the recess 373, i.e., the return passage 37c. The insertion hole 37d is formed with approximately the same diameter as the outer diameter of the first plain bearing 51.

[0063] The suction passage 37e is disposed radially outward of the cover body 37 relative to the recess 373 and at a location different from the passage main body 374. As a result, the suction passage 37e, including the recess 373, is not in communication with the return passage 37c. The suction passage 37e penetrates the cover main body 37a in the front-rear direction, with its front end opening to the second front surface 371 at a location different from the passage main body 374 and its rear end opening to the second rear surface 372. The suction passage 37e is inclined radially inward of the cover body 37 from the front to the rear. The rear end of the suction passage 37e opens to the second rear surface 372 at a location radially inward of the cover body 37 relative to the extension portion 37b.

[0064] The first bolt holes 37f are disposed radially outward of the cover body 37 relative to the suction passages 37e. The first bolt holes 37f penetrate the cover main body 37a in the direction of the drive axis O1. A plurality of first bolt holes 37f are formed in the cover main body 37a.

[0065] Additionally, multiple rings 22 are attached to the cover main body 37a at a location between the recess 373 and the suction passage 37e. Although not shown in detail, the rings 22 are disposed at equal intervals around the circumferential direction of the recess 373 while facing forward, and surround the recess 373 from the outside. In this embodiment, there are six rings 22. Also, one each of each ring 22 and the first bolt hole 37f described above is illustrated in FIGS. 1 to 3.

[0066] 2, the extension portion 37b is formed integrally with the cover main body portion 37a and extends cylindrically rearward from the second rear surface 372 in the direction of the drive axis O1. The extension portion 37b has an inner diameter larger than that of the second diameter portion 64b of the protrusion 64, more specifically, the main body portion 641 of the second diameter portion 64b. On the other hand, the extension portion 37b has an outer diameter smaller than that of the rotor 11.

[0067] The cover body 37 has the second front surface 371 of the cover main body portion 37a abutting against the rear end surface of the drive peripheral wall 35. In this state, the first bolts 34a are inserted into the first bolt holes 37f and screwed into the drive peripheral wall 35. In this manner, the cover body 37 is fixed to the drive peripheral wall 35 of the driving scroll 30. As a result, one end of the passage body 374 is aligned with the rear end of the first supply passage 35a. Furthermore, by fixing the cover body 37 to the drive peripheral wall 35, the passage body 374 of the return passage 37c and the first supply passage 35a are in communication with each other.

[0068] 1, the case 39 is a cylindrical member with a bottom and an outer peripheral wall 39a and a front wall 39b. The outer peripheral wall 39a is cylindrical and has its center on the drive axis O1. The outer diameter of the outer peripheral wall 39a is larger than that of the ball bearing 52 and is approximately the same diameter as that of the drive end plate 31.

[0069] A second supply passage 39c is formed in the outer peripheral wall 39a. One end of the second supply passage 39c opens to the inner peripheral surface of the outer peripheral wall 39a. The second supply passage 39c extends inside the outer peripheral wall 39a and the other end opens to the rear end surface of the outer peripheral wall 39a.

[0070] The front wall 39b is located at the front end of the case 39. The front wall 39b extends in a generally disk-like shape, perpendicular to the drive axis O1 and the driven axis O2. The outer peripheral edge of the front wall 39b is connected to the front end of the outer peripheral wall 39a.

[0071] A boss 39d is formed on the front wall 39b. The boss 39d is an example of the "supported member" of the present invention. The boss 39d is integrally formed at the center of the front wall 39b and protrudes forward from the front wall 39b in the direction of the drive axis O1. The boss 39d has approximately the same diameter as the inner diameter of the ball bearing 52 and the inner diameter of the shaft seal member 63. A discharge passage 390 is formed in the boss 39d. The discharge passage 390 penetrates the boss 39d in the direction of the drive axis O1.

[0072] Furthermore, second bolt holes 39e are formed in the outer peripheral wall 39a and the front wall 39b. The second bolt holes 39e penetrate the outer peripheral wall 39a and the front wall 39b in the direction of the drive axis O1. The second bolt holes 39e do not communicate with the second supply passage 39c. A plurality of second bolt holes 39e are formed in the outer peripheral wall 39a and the front wall 39b. FIG. 1 illustrates one of the plurality of second bolt holes 39e.

[0073] The rear end surface of the outer peripheral wall 39a of the case 39 abuts against the first front surface 311 of the driving end plate 31. In this state, the second bolts 34b are inserted into the second bolt holes 39e, respectively, and the second bolts 34b are screwed into the driving end plate 31. In this way, the case 39 of the driving scroll 30 is fixed to the driving end plate 31.

[0074] By fixing the case 39 to the drive end plate 31 in this manner, 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 formed with a diameter larger than that of the ball bearing 52. The discharge chamber 14 is also in communication with the discharge port 32 and the discharge passage 390. Furthermore, one end of the second supply passage 39c is in communication with the discharge chamber 14.

[0075] Furthermore, by fixing the case 39 to the drive end plate 31, the other end of the second supply passage 39c is aligned with the front end of the first supply passage 35a, thereby connecting the second supply passage 39c and the first supply passage 35a. As a result, in the drive scroll 30, the return passage 37c is connected to the discharge chamber 14 through the first supply passage 35a and the second supply passage 39c.

[0076] The driven scroll 40 is also made of an aluminum alloy. The driven scroll 40 has a driven end plate 41 and a driven scroll 43.

[0077] The driven end plate 41 has a generally disk-like shape and extends 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 rearward.

[0078] An accommodating recess 15 is formed in the driven end plate 41. The accommodating recess 15 is located in the center of the driven end plate 41. The accommodating recess 15 is recessed in a cylindrical shape centered on the driven axis O2 and extends forward from the third rear surface 412 of the driven end plate 41. As a result, the accommodating recess 15 faces the rear of the driven end plate 41, and ultimately faces the first diameter portion 64a of the protrusion 64.

[0079] A driven shaft portion 16 is provided in the accommodation recess 15. The driven shaft portion 16 has a bushing 53 and a driven pin 55. The bushing 53 is accommodated in the accommodation recess 15 via the second plain bearing 13. The driven pin 55 is inserted through the bushing 53. More specifically, the driven pin 55 is inserted through the bushing 53 at a position eccentric to the center of the bushing 53, i.e., the driven axis O2. The driven pin 55 protrudes rearward from the bushing 53 and, therefore, from the driven end plate 41.

[0080] Furthermore, a rotation prevention pin 21 is fixed to the driven end plate 41 at a position facing the ring 22. The rotation prevention pin 21 protrudes rearward from the third rear surface 412. Six rotation prevention pins 21 are fixed to the driven end plate 41, the same number as the number of rings 22. Only one of the rotation prevention pins 21 is shown in FIG. 1.

[0081] These rotation-preventing pins 21 and rings 22 constitute the driven mechanism 20. The number of rotation-preventing pins 21 and rings 22 can be appropriately designed as long as there are three or more of each.

[0082] 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 in parallel with the drive axis O1 and the driven axis O2. The driven spiral body 43 has a spiral center on the center side of the driven end plate 41 and extends spirally outward from the spiral center.

[0083] In this compressor, the driven scroll 40 is housed within the driving scroll 30, more specifically, in a location in the driving scroll 30 between the driving scroll 33 and the driving peripheral wall 35 and the cover body 37. The driving scroll 30 and the driven scroll 40 are arranged such that the driving scroll 33 and the driven scroll 43 are meshed with each other. As a result, the driving scroll 33 and the driven scroll 43 face each other to form a compression chamber 12.

[0084] Furthermore, an intake section 30a is formed between the driving peripheral wall 35 and the driven scroll 40. That is, the driving scroll 33 and the driven scroll 43 are located within the intake section 30a. The intake section 30a is separated from the scroll chamber 65 by the driving end plate 31, the driving peripheral wall 35, and the cover body 37, and is also separated from the discharge chamber 14 by the driving end plate 31. The intake section 30a also communicates with an intake passage 37e.

[0085] Furthermore, by accommodating the driven scroll 40 within the driving scroll 30, each of the rotation-preventing pins 21 enters each of the rings 22. In this manner, the driving scroll 30 and the driven scroll 40 are assembled in the front-to-rear direction, and the driving scroll 30 and the driven scroll 40 form a scroll compression section 100. Strictly speaking, after the driving scroll 33 and the driven scroll 43 are engaged with each other and the rotation-preventing pins 21 enter each of the rings 22, the cover body 37 of the driving scroll 30 is fixed to the driving peripheral wall 35.

[0086] Furthermore, by assembling the drive scroll 30 and the driven scroll 40, the accommodation recess 15 of the driven end plate 41 and the bushing 53 face the recess 373 of the cover body 37, that is, the return passage 37c.

[0087] The driving scroll 30 is disposed in the scroll chamber 65 forward of the electric motor 10. In addition, the driving scroll 30 fixes the rotor 11 to the extending portion 37b of the cover body 37. More specifically, the extending portion 37b is inserted into the rotor 11, and the outer peripheral surface of the extending portion 37b is fixed to the rotor 11. In this way, the driving scroll 30 is fixed to the rotor 11 via the extending portion 37b.

[0088] In the driving scroll 30, the first diameter portion 64a of the protrusion 64 and the main body portion 641 of the second diameter portion 64b are inserted into the extension portion 37b. Here, since the extension portion 37b is formed with a larger diameter than the main body portion 641, a gap S is formed between the inner circumferential surface of the extension portion 37b and the main body portion 641. The gap S is in communication with the scroll chamber 65.

[0089] In the driving scroll 30, the first plain bearing 51 is inserted into the insertion hole 37d of the cover body 37. As a result, the cover body 37 is rotatably supported on the first diameter portion 64a via the first plain bearing 51. The pin hole 4 and the connecting passage 5 communicate with the recess 373. The pin hole 4 and the connecting passage 5 each face the bush 53 in the front-rear direction.

[0090] 2, in this compressor, the first plain bearing 51 is provided on the outer peripheral surface of the first diameter portion 64a. Meanwhile, the pin hole 4 and the connecting passage 5 extend into the first diameter portion 64a. Therefore, by rotatably supporting the cover body 37 on the first diameter portion 64a via the first plain bearing 51, the pin hole 4 and the connecting passage 5 communicate with the recess 373, i.e., the return passage 37c, at a location radially inward of the protrusion 64 relative to the first plain bearing 51.

[0091] The return passage 37c communicates with the connecting passage 5, so that the oil reservoir chamber 3 communicates with the return passage 37c.

[0092] Furthermore, in the driving scroll 30, the discharge passage 8 faces into the gap S. As a result, the oil storage chamber 3 and the gap S communicate with each other through the discharge passage 8. Also, in the driving scroll 30, the front end of the first communication passage 7 faces into the gap S, so that the first communication passage 7 communicates with the gap S.

[0093] 1 , in the driving scroll 30, the boss 39d of the case 39 is inserted into the ball bearing 52 and the shaft seal member 63. As a result, the case 39 is rotatably supported by the support portion 66 via the ball bearing 52. In this way, the driving scroll 30 is disposed in the scroll chamber 65 and is supported by the housing 6 by both the protrusion 64 and the support portion 66 so as to be rotatable about the drive axis O1.

[0094] Furthermore, since the case 39 is supported by the support portion 66, the discharge passage 390 faces the discharge communication port 69 from the rear. This allows the discharge chamber 14 to communicate with the discharge communication port 69 through the discharge passage 390. Here, in the driving scroll 30, the shaft seal member 63 seals the space between the discharge passage 390 and the scroll chamber 65.

[0095] On the other hand, in the driven scroll 40, the driven pin 55 is inserted into the pin hole 4. As a result, the driven scroll 40 is disposed in the scroll chamber 65 and is supported rotatably around the driven axis O2 with respect to the first diameter portion 64a of the protruding body 64.

[0096] In the compressor configured as described above, as indicated 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 through the suction port 68. When the electric motor 10 is operated and the rotor 11 rotates, the rotation of the rotor 11 is transmitted to the driving scroll 30, causing the driving scroll 30 to rotate about the drive axis O1 within the scroll chamber 65. In other words, the driving scroll 30 and the rotor 11 rotate integrally. At this time, in the driven mechanism 20, each rotation-preventing pin 21 slides against the inner circumferential surface of each ring 22, causing the rings 22 to rotate relatively about the center of the rotation-preventing pin 21. In this way, the driven mechanism 20 transmits the torque of the driving scroll 30 to the driven scroll 40.

[0097] As a result, the driven scroll 40 is rotated around the driven axis O2 by the driving scroll 30 and the driven mechanism 20. At this time, the driven mechanism 20 restricts the rotation of the driven scroll 40. As a result, the driven scroll 40 revolves around the driven axis O2 relative to the driving scroll 30. Then, as the driving scroll 33 and the driven scroll 43 each rotate within the suction section 30a, the driving scroll 33 and the driven scroll 43 change the volume of the compression chamber 12.

[0098] The refrigerant drawn into the scroll chamber 65 flows through the suction passage 37e via the gap S. The refrigerant drawn into the scroll chamber 65 contains lubricating oil 18. Therefore, some of the lubricating oil 18 contained in the refrigerant is accumulated in the lower part of the scroll chamber 65 due to gravity. As a result, the lubricating oil 18 lubricates the electric motor 10.

[0099] Here, the protrusion 64 is fixed to the housing main body 60 and therefore does not rotate. Therefore, when the drive scroll 30 is driven to rotate about the drive axis O1, the extension portion 37b rotates relative to the second diameter portion 64b of the protrusion 64 about the drive axis O1. As a result, of the refrigerant flowing through the gap S toward the suction passage 37e, liquid refrigerant, which is in liquid phase, is vaporized by shear force while flowing through the gap S. Therefore, the refrigerant that reaches the suction passage 37e becomes gas refrigerant, which is in almost gas phase. In other words, the liquid refrigerant has difficulty reaching the suction passage 37e and therefore has difficulty flowing through the suction passage 37e.

[0100] The refrigerant that reaches the suction passage 37e from the gap S is drawn from the suction passage 37e through the suction section 30a into the compression chamber 12. The compression chamber 12 then compresses the refrigerant by reducing its volume while trapping the refrigerant therein due to the rotational driving of the drive scroll 30 and the rotational driven movement of the driven scroll 40. The high-pressure refrigerant compressed to the discharge pressure is then discharged from the discharge port 32 into the discharge chamber 14.

[0101] Here, the lubricating oil that is not stored in the scroll chamber 65 and is drawn into the compression chamber 12 together with the refrigerant is discharged from the discharge port 32 into the discharge chamber 14 together with the high-pressure refrigerant. Furthermore, because the driving scroll 30 is driven to rotate about the drive axis O1, the centrifugal force of the rotating driving scroll 30 acts on the refrigerant discharged into the discharge chamber 14. As a result, the lubricating oil 18 contained in the refrigerant is separated from the refrigerant by centrifugal force. At this time, the centrifugal force causes the lubricating oil 18 in the discharge chamber 14 to splash outward within the discharge chamber 14 toward the outer periphery, i.e., toward the outer periphery wall 39a of the case 39.

[0102] In this way, the refrigerant discharged into the discharge chamber 14 flows through the discharge passage 390 and is discharged to the outside of the compressor through a pipe connected to the discharge communication port 69. At this time, in this compressor, the shaft seal member 63 seals the space between the discharge passage 390 and the scroll chamber 65, preventing the refrigerant flowing from the discharge passage 390 toward the discharge communication port 69 from circulating inside the scroll chamber 65.

[0103] On the other hand, the lubricating oil 18 discharged from the discharge port 32 into the discharge chamber 14 together with the refrigerant is stored in the discharge chamber 14. The lubricating oil 18 in the discharge chamber 14 flows from the second supply passage 39c through the first supply passage 35a toward the return passage 37c, as shown by the solid arrows in Figures 1 and 2. In the return passage 37c, the lubricating oil 18 passes through the passage body 374 and reaches the recess 373.

[0104] Here, in this compressor, the connecting passage 5 is located radially inward of the protruding body 64 in the first diameter portion 64a of the protruding body 64 relative to the first plain bearing 51. Therefore, the lubricating oil 18 in the recess 373 flows from the recess 373 to the connecting passage 5 radially inward of the protruding body 64 relative to the first plain bearing 51. As a result, in this compressor, the first plain bearing 51 can be suitably lubricated by the lubricating oil 18 flowing from the recess 373 to the connecting passage 5. In other words, in this compressor, the lubricating oil 18 can suitably lubricate the gap between the first plain bearing 51 and the first diameter portion 64a, and the gap between the first plain bearing 51 and the insertion hole 37d of the cover body 37. As a result, insufficient lubrication of the first plain bearing 51 can be suitably prevented in this compressor.

[0105] Furthermore, in this compressor, the lubricating oil 18 in the recess 373 also effectively lubricates the second sliding bearing 13, the driven shaft 16, the rotation prevention pin 21, the ring 22, etc., and therefore, insufficient lubrication of the driven shaft 16, etc. can also be effectively prevented.

[0106] The lubricating oil 18 in the recess 373 then flows from the connecting passage 5 into the oil reservoir 3. As a result, the lubricating oil 18 is stored in the oil reservoir 3. Here, the temperature of the lubricating oil 18 in the oil reservoir 3 is reduced and its pressure is reduced as it flows from the discharge chamber 14 through the second supply passage 39c, the first supply passage 35a, the return passage 37c, and the connecting passage 5. Therefore, the lubricating oil 18 in the oil reservoir 3 is at a lower temperature and pressure than the lubricating oil 18 in the discharge chamber 14. The atmosphere in the oil reservoir 3 is also at a lower temperature and pressure than the atmosphere in the discharge chamber 14.

[0107] However, the oil reservoir 3 has a higher pressure atmosphere than the scroll chamber 65. Therefore, as shown by the solid arrows in Figures 1 and 2, the lubricating oil 18 in the oil reservoir 3 flows through the discharge passage 8 into the gap S, that is, out of the oil reservoir 3.

[0108] 1, the lubricating oil 18 stored in the scroll chamber 65 flows from the second communication passage 9 through the first communication passage 7 and into the gap S. Here, the lubricating oil 18 in the scroll chamber 65 is also at a lower temperature and pressure than the lubricating oil 18 in the discharge chamber 14.

[0109] As a result, the lubricating oil 18 in the oil reservoir 3 and the lubricating oil 18 that has flowed through the first communication passage 7 reaches the suction passage 37e together with the refrigerant flowing through the gap S toward the suction passage 37e, and is then drawn into the compression chamber 12 together with the refrigerant. In this manner, in this compressor, the driving scroll 30 and the driven scroll 40, including the inside of the compression chamber 12, are suitably lubricated by the lubricating oil 18. In this compressor, the lubricating oil 18 that has flowed from the return passage 37c through the connecting passage 5 to the oil reservoir 3 can be used to lubricate the driving scroll 30 and the driven scroll 40. Therefore, in this compressor, insufficient lubrication of the driving scroll 30 and the driven scroll 40 can also be suitably prevented.

[0110] Therefore, the compressor of Example 1 has excellent durability.

[0111] In particular, in this compressor, the lubricating oil 18 that flows from the return passage 37c through the connecting passage 5 into the oil reservoir chamber 3 can be stored in the oil reservoir chamber 3. This makes it possible for the compressor to suitably use the lubricating oil 18 stored in the oil reservoir chamber 3 to lubricate the driving scroll 30, the driven scroll 40, etc.

[0112] Furthermore, in this compressor, the discharge passage 390 is formed within the boss 39d, which makes it possible to easily form the discharge passage 390. Also, in this compressor, the boss 39d is supported by the ball bearing 52, which allows the discharge passage 390 and the discharge communication port 69 to be suitably close to each other. Furthermore, in this compressor, the boss 39d is inserted into the shaft seal 63, which seals the discharge passage 390 and the discharge communication port 69 from the scroll chamber 65. For these reasons, in this compressor, it is possible to suitably prevent refrigerant flowing through the discharge passage 390 toward the discharge communication port 69 from leaking into the scroll chamber 65.

[0113] In this compressor, the protruding body 64 has a first diameter portion 64a and a second diameter portion 64b, and the second diameter portion 64b has a larger diameter than the first diameter portion 64a. Therefore, the oil storage chamber 3, the first communication passage 7, and the second communication passage 9 are formed inside the second diameter portion 64b, while the rigidity of the protruding body 64 is ensured by the second diameter portion 64b.

[0114] Furthermore, because the second diameter portion 64b is larger than the first diameter portion 64a, it is possible to easily form the oil storage chamber 3, the first communication passage 7, and the second communication passage 9 in the second diameter portion 64b, and it is also possible to increase the degree of freedom in designing the oil storage chamber 3, the first communication passage 7, and the second communication passage 9. Furthermore, because the first diameter portion 64a has a smaller diameter than the second diameter portion 64b, in this compressor, it is possible to prevent the diameter of the first plain bearing 51 from becoming larger.

[0115] Furthermore, since the discharge chamber 14 is formed with a diameter larger than that of the ball bearing 52, the compressor can preferably secure a volume for the discharge chamber 14. As a result, the discharge chamber 14 preferably exerts a muffler effect on the refrigerant, thereby preferably reducing discharge pulsation when the refrigerant is discharged from the discharge communication port 69.

[0116] 3 , in the compressor of the second embodiment, a connecting passage 5a is formed in the first diameter portion 64a of the protruding body 64 instead of the connecting passage 5. Also, in this compressor, a driven shaft portion 16a is provided in the accommodation recess 15 of the driven scroll 40 instead of the driven shaft portion 16.

[0117] The connecting passage 5a is located radially inward of the protruding body 64 relative to the first plain bearing 51, and penetrates the first diameter portion 64a in the direction of the drive shaft center O1. As a result, the front end of the connecting passage 5a opens at the front end surface of the first diameter portion 64a. The rear end of the connecting passage 5a communicates with the oil reservoir chamber 3. The connecting passage 5a has a larger diameter than the connecting passage 5 in the compressor of the first embodiment. Note that in this compressor, no pin hole 4 is formed in the first diameter portion 64a.

[0118] The driven shaft portion 16a has a bushing 54 and a driven pin 56. The bushing 54 is accommodated in the accommodation recess 15 via the second plain bearing 13. A bushing passage 54a is formed in the bushing 54. The bushing passage 54a passes through the bushing 54 in the direction of the drive axis O1. As a result, the front end of the bushing passage 54a communicates with the interior of the accommodation recess 15.

[0119] The driven pin 56 is inserted into the bushing 54 at a location different from the bushing passage 54a. As a result, the driven pin 56 protrudes rearward from the bushing 54 and, ultimately, from the driven end plate 41. The driven pin 56 also has a shaft hole 56a formed therein. The shaft hole 56a passes through the driven pin 56 in the direction of the drive axis O1. As a result, the shaft hole 56a communicates with the inside of the accommodating recess 15 at its front end. The bushing passage 54a and the shaft hole 56a form the "shaft passage" in the present invention.

[0120] In this compressor, the driving scroll 30 and the driven scroll 40 are assembled together in the same manner as in the compressor of Example 1. As a result, the bushing 54 faces the recess 373 of the cover body 37, and the rear end of the bushing passage 54a communicates with the interior of the recess 373. In other words, the bushing passage 54a communicates with the accommodation recess 15 and the recess 373.

[0121] Furthermore, in this compressor, a driven pin 56 is inserted into the connecting passage 5a. As a result, in this compressor as well, the driven scroll 40 is supported rotatably about the driven axis O2 with respect to the first diameter portion 64a of the protruding body 64. Here, since the connecting passage 5a is located radially inward of the protruding body 64 with respect to the first plain bearing 51, the driven pin 56, when inserted into the connecting passage 5a, is located radially inward of the protruding body 64 with respect to the first plain bearing 51.

[0122] The driven pin 56 is inserted into the connecting passage 5a, so that the rear end of the axial hole 56a communicates with the connecting passage 5a. Thus, in this compressor, the bushing passage 54a and the axial hole 56a communicate with the return passage 37c and the connecting passage 5a. The axial hole 56a also communicates with the oil reservoir 3 through the connecting passage 5a. The other configurations of this compressor are similar to those of the compressor of the first embodiment, and the same components are designated by the same reference numerals, and detailed description of the configurations will be omitted.

[0123] In this compressor, as the lubricating oil 18 in the recess 373 flows toward the connecting passage 5a, it flows sequentially through the bushing passage 54a, the accommodating recess 15, and the axial hole 56a. Then, the lubricating oil 18 flows from the connecting passage 5a into the oil storage chamber 3. That is, in this compressor, the lubricating oil 18 in the recess 373 flows through the connecting passage 5a via the bushing passage 54a, the accommodating recess 15, and the axial hole 56a.

[0124] In this manner, the lubricating oil 18 flows through the bush passage 54a, the accommodating recess 15, and the shaft hole 56a, so that in this compressor, the driven shaft portion 16a can be suitably lubricated by the lubricating oil 18, including between the second sliding bearing 13 and the bush 54, and between the bush 54 and the driven pin 56.

[0125] In addition, in this compressor, the driven pin 56 is inserted into the connecting passage 5a, so that the connecting passage 5a also serves as the pin hole 4 in the compressor of the first embodiment. As a result, in this compressor, it is not necessary to form the pin hole 4 in the first diameter portion 64a of the protrusion 64, which makes it easier to form the protrusion 64. Other functions of this compressor are the same as those of the compressor of the first embodiment.

[0126] Although the present invention has been described above in accordance with Examples 1 and 2, it goes without saying that the present invention is not limited to the above Examples 1 and 2, and can be appropriately modified and applied within the scope of the invention.

[0127] For example, in the compressors of Examples 1 and 2, the first plain bearing 51 serves as the "bearing portion" of the present invention. However, this is not limiting, and the "bearing portion" of the present invention may be formed by providing a coating layer that imparts slidability to the outer peripheral surface of the first diameter portion 64a or the inner peripheral surface of the insertion hole 37d, or by providing a plating layer on the outer peripheral surface of the first diameter portion 64a or the inner peripheral surface of the insertion hole 37d.

[0128] Alternatively, the first communication passage 7 and the second communication passage 9 may be omitted from the second diameter portion 64b, and the discharge passage 8 may be connected to the scroll chamber 65 at a location rearward of the extending portion 37b of the cover body 37. In this case, the suction passage 37e may be connected to the scroll chamber 65 at a location radially outward of the cover body 37 relative to the extending portion 37b.

[0129] Furthermore, the passage body 374 of the return passage 37c may be configured to be recessed in the second front surface 371 of the cover body portion 37a.

[0130] Alternatively, the stator 17 may be fixed to the outer peripheral surface of the second diameter portion 64b, and the rotor 11 may be fixed to the extension portion 37b of the cover body 37 while surrounding the stator 17 from the outside.

[0131] Furthermore, in the compressors of Examples 1 and 2, the protrusion 64 has a first diameter portion 64a and a second diameter portion 64b, but this is not limited thereto, and the protrusion 64 may be formed only with the first diameter portion 64a, or the protrusion 64 may be formed only with the second diameter portion 64b.

[0132] In the compressors of Examples 1 and 2, the housing body 60 and the protruding body 64 are formed separately, and the protruding body 64 is fitted into the mounting recess 60c of the rear wall 60b. However, this is not limiting, and the protruding body 64 may be formed integrally with the rear wall 60b.

[0133] The present specification also includes the following inventions: (Note 1) A double-rotating scroll compressor comprising a housing, a drive mechanism, a driving scroll, a driven scroll, a driven mechanism, and a discharge chamber, wherein the housing has a scroll chamber in which the driving scroll and the driven scroll are accommodated, the driving scroll is rotationally driven about a drive axis by the drive mechanism, the driven scroll is rotationally driven by the drive scroll and the driven mechanism about a driven axis while being eccentric with respect to the driving scroll, the driving scroll and the driven scroll form a compression chamber that compresses a refrigerant by the rotational driving and the rotational driven, and the refrigerant compressed in the compression chamber is discharged from the discharge chamber, wherein a protrusion is provided within the housing that protrudes into the scroll chamber in the direction of the drive axis toward the driving scroll and the driven scroll, the driving scroll has a cover body rotatably supported by the protrusion body via a bearing part, and a return passage is formed in the cover body that is in communication with the discharge chamber and that circulates lubricating oil in the discharge chamber toward the protrusion body, a connecting passage formed in the protruding body, the connecting passage being located radially inward of the protruding body relative to the support portion and communicating with the return passage; and a lubricating oil passage formed in the housing, the lubricating oil passage being located radially inward of the drive mechanism, communicating with the connecting passage and allowing the lubricating oil to flow. (Appendix 2) The bidirectional rotary scroll compressor according to Appendix 1, wherein the driven scroll has a driven shaft supported by the protruding body radially inward of the support portion, and the driven shaft has a shaft passage formed in the driven shaft that is connected to the return passage and the lubricating oil passage and allows the lubricating oil to flow toward the lubricating oil passage. (Appendix 3) The bidirectional rotary scroll compressor according to Appendix 2, wherein the driven shaft is inserted into the connecting passage. (Supplementary Note 4) The double-rotary scroll compressor according to any one of Supplementary Notes 1 to 3, wherein the protrusion has a first diameter portion where the cover body is supported via the journal portion and where the connection passage is formed, and a second diameter portion that is larger in diameter than the first diameter portion and where the lubricating oil passage is formed.(Supplementary Note 5) The double rotary scroll compressor according to any one of Supplementary Notes 1 to 4, wherein the lubricating oil passage is capable of storing the lubricating oil therein.

[0134] The present invention can be used in vehicle air conditioning systems and the like.

[0135] 3 Oil storage chamber (lubricating oil passage) 5, 5a Connecting passage 6 Housing 10 Electric motor (driving mechanism) 12 Compression chamber 14 Discharge chamber 16, 16a Driven shaft portion 18 Lubricating oil 20 Driven mechanism 30 Driving scroll 37 Cover body 37c Circulation passage 39d Boss (supported member) 40 Driven scroll 51 First plain bearing (bearing portion) 52 Ball bearing (bearing) 54a Bush passage (shaft passage) 56a Shaft passage (shaft passage) 64 Projecting body 64a First diameter portion 64b Second diameter portion 65 Scroll chamber O1 Driven shaft center O2 Driven shaft center

Claims

1. A double-rotating scroll compressor comprising a housing, a drive mechanism, a driving scroll, a driven scroll, a driven mechanism, and a discharge chamber, wherein the housing has a scroll chamber in which the driving scroll and the driven scroll are housed, the driving scroll is rotationally driven about the drive axis by the drive mechanism, the driven scroll is rotationally driven by the drive scroll and the driven mechanism about the driven axis while being eccentric with respect to the driving scroll, the driving scroll and the driven scroll form a compression chamber that compresses a refrigerant by the rotational drive and the rotational driven, and the refrigerant compressed in the compression chamber is discharged into the discharge chamber, wherein a protrusion is provided within the housing that protrudes into the scroll chamber in the direction of the drive axis toward the driving scroll and the driven scroll, the driving scroll has a cover body rotatably supported on the protrusion body via a bearing part, and a return passage is formed in the cover body that communicates with the discharge chamber and allows lubricating oil in the discharge chamber to circulate toward the protrusion body, a connecting passage formed in the protruding body, the connecting passage being located radially inward of the supporting portion, and communicating with the return passage; and a lubricating oil passage formed in the housing, the connecting passage being located radially inward of the drive mechanism, and allowing the lubricating oil to flow.

2. A double-rotating scroll compressor according to claim 1, wherein the driven scroll has a driven shaft portion supported by the protruding body radially inward of the support portion, and the driven shaft portion is formed with a shaft passage that communicates with the return passage and the lubricating oil passage and through which the lubricating oil can flow.

3. A double-rotating scroll compressor according to claim 2, wherein the driven shaft is inserted through the connecting passage.

4. A double-rotating scroll compressor according to claim 1 or 2, wherein the protrusion has a first diameter portion where the cover body is supported via the journal portion and where the connecting passage is formed, and a second diameter portion that is larger in diameter than the first diameter portion and where the lubricating oil passage is formed.

5. A double rotary scroll compressor according to claim 1 or 2, wherein said lubricating oil passage is capable of storing said lubricating oil therein.

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