Scroll compressor

Abstract

The bush (51) has an oil passage (60) formed in an opposing surface (51a) of the bush (51). The oil passage (60) has an inflow port (61) extending from the through-hole (54) toward the outer peripheral surface of the bush (51) and opening in the outer peripheral surface of the bush (51). An oil groove (70) is formed in the inner peripheral surface of the through hole (54) except for a part where a compression load transmitted from the orbiting scroll acts between the inner peripheral surface of the through hole (54) and the outer peripheral surface of the eccentric shaft (50). The oil groove (70) communicates with the oil passage (60) and opens at an end surface on the orbiting wrap wall side of the bush (51).

Description

Technical Field

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

[0002] A scroll compressor includes a housing, a support shaft, a first scroll plate, and a second scroll plate. The support shaft is supported by the housing. The first scroll plate has a first base plate and a first scroll wall. The first scroll wall stands up from the first base plate. The second scroll plate has a second base plate and a second scroll wall. The second base plate faces the first base plate. The second scroll wall stands up from the second base plate toward the first base plate. The second scroll wall meshes with the first scroll wall.

[0003] The scroll compressor includes an eccentric shaft and a bushing. The eccentric shaft projects from the front end face of the support shaft. The eccentric shaft extends parallel to the support shaft at a position eccentric with respect to the axis of the support shaft. The bushing has a through hole into which the eccentric shaft is inserted. The bushing can swing about the eccentric shaft. The scroll compressor includes a cylindrical holding portion. The holding portion is provided on the end face of the second base plate on the side opposite to the first base plate. The bushing is disposed inside the holding portion. A bearing is disposed between the inner peripheral surface of the holding portion and the outer peripheral surface of the bushing. The bushing is held by the holding portion via the bearing.

[0004] However, in order to improve the durability of the scroll compressor, it is desired to supply oil to the bearing efficiently. Therefore, for example, in Patent Document 1, a supply flow path for supplying oil to the bearing is formed in the bushing. The supply flow path has an axial flow path portion extending along the axial direction of the bushing and a radial flow path portion extending along the radial direction of the bushing. The axial flow path portion has an inlet of the supply flow path. The radial flow path portion has an outlet of the supply flow path. And the oil introduced into the axial flow path portion from the inlet flows in the axial flow path portion and flows into the radial flow path portion. The oil flowing in the radial flow path portion is supplied to the bearing via the discharge port. Thereby, the lubrication of the bearing becomes good, and thus the durability of the scroll compressor is improved.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-83044 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] However, in Patent Document 1, in order to supply oil to the bearing, a through hole different from the through hole into which the eccentric shaft is inserted, that is, an axial flow path portion, is formed in the bushing. Therefore, it is necessary to ensure the wall thickness of the bushing corresponding to the formation of the axial flow path portion, and thus the bushing is enlarged. As a result, the scroll compressor is enlarged.

[0010] Means for Solving the Problems

[0011] In order to solve the above problems, according to one aspect of the present invention, there is provided a scroll compressor including: a housing; a support shaft supported by the housing; a first scroll plate having a first base plate and a first scroll wall standing up from the first base plate; a second scroll plate having a second base plate opposed to the first base plate and a second scroll wall standing up from the second base plate toward the first base plate and engaging with the first scroll wall; an eccentric shaft protruding from the front end surface of the support shaft and extending in parallel with the support shaft at a position eccentric with respect to the axis of the support shaft; a bushing having a through hole into which the eccentric shaft is inserted and capable of swinging about the eccentric shaft; a cylindrical holding portion provided on the end surface of the second base plate on the side opposite to the first base plate and having the bushing disposed inside; and a bearing disposed between the inner peripheral surface of the holding portion and the outer peripheral surface of the bushing. The bushing is held by the holding portion via the bearing. The bushing has an oil passage on the opposing surface opposed to the front end surface of the support shaft. The oil passage extends from the through hole toward the outer peripheral surface of the bushing and has an inlet opening on the outer peripheral surface of the bushing. An oil groove communicating with the oil passage and opening on the end surface of the bushing on the second scroll wall side is formed in at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft, except for a portion where a compression load transmitted from the second scroll plate acts between the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft.

[0012] Thus, the oil present around the bushing flows into the oil passage from the inlet and is supplied to the oil groove. The oil supplied to the oil groove passes through the oil groove and flows out into the space between the end surface of the bushing on the second scroll wall side and the second base plate. And the oil flowing out into this space is supplied to the bearing. Thus, the lubrication of the bearing becomes good, and therefore the durability of the scroll compressor is improved.

[0013] The oil groove is formed in at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft. Therefore, unlike the prior art, it is not necessary to form a through hole different from the through hole into which the eccentric shaft is inserted in the bushing in order to supply oil to the bearing. Therefore, it is not necessary to ensure the wall thickness of the bushing. As a result, it is possible to avoid the enlargement of the bushing. Therefore, miniaturization of the scroll compressor can be achieved. In addition, the oil groove is formed in at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft, except for a portion where a compression load transmitted from the second scroll plate acts between the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft. Therefore, even if an oil groove is formed in at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft, the swinging of the bushing about the eccentric shaft is not hindered by the oil groove. Thus, in the scroll compressor, miniaturization can be achieved and the durability can be improved.

[0014] In the above-described scroll compressor, it is possible that the support shaft is a rotating shaft supported rotatably by the housing, the first scroll disk is a fixed scroll disk having a fixed substrate as the first substrate and a fixed scroll wall as the first scroll wall standing up from the fixed substrate, the second scroll disk is a revolving scroll disk having a revolving substrate as the second substrate facing the fixed substrate and a revolving scroll wall as the second scroll wall standing up from the revolving substrate toward the fixed substrate and engaging with the fixed scroll wall, and the revolving scroll disk revolves by the rotation of the rotating shaft. Thus, in the scroll compressor including the fixed scroll disk and the revolving scroll disk, miniaturization can be achieved and durability can be improved.

[0015] In the above-described scroll compressor, it is possible that the oil passage has a guiding surface that bends from the through hole toward the rotational direction of the bushing when the rotational axis rotates in the positive direction and extends toward the inflow port, and the guiding surface guides the oil flowing in the oil passage toward the through hole.

[0016] Accordingly, the oil from the inflow port is guided toward the through hole by the guiding surface, and thus the oil from the inflow port is easily supplied to the oil sump via the oil passage. As a result, since the oil is efficiently supplied to the bearing, the lubrication of the bearing is better. Therefore, the durability of the scroll compressor can be further improved.

[0017] In the above-described scroll compressor, it is possible that the first scroll disk is a driving scroll disk having a driving substrate as the first substrate and a driving scroll wall as the first scroll wall standing up from the driving substrate and rotating about the axis of the support shaft, the second scroll disk is a driven scroll disk having a driven substrate as the second substrate facing the driving substrate and a driven scroll wall as the second scroll wall standing up from the driven substrate toward the driving substrate and engaging with the driving scroll wall, and the driven scroll disk rotates following the rotation of the driving scroll disk. Thus, in the scroll compressor including the driving scroll disk and the driven scroll disk, miniaturization can be achieved and durability can be improved.

[0018] In the above-described scroll compressor, it is possible that the inflow port opens at a portion of the outer peripheral surface of the bushing located above the vertical direction.

[0019] Accordingly, the oil present around the bushing easily falls by its own weight and flows into the inflow port, and thus the oil present around the bushing easily flows into the oil passage from the inflow port and is supplied to the oil sump. Therefore, the lubrication of the bearing becomes better, and thus the durability of the scroll compressor can be further improved.

[0020] In the above-described scroll compressor, it is possible that the oil passage has a guiding surface that bends from the through-hole toward the opposite direction of the rotation direction of the driven scroll when the driving scroll rotates in the positive direction and extends toward the inlet, and the guiding surface guides the oil flowing in the oil passage toward the through-hole.

[0021] The oil present around the bushing follows the rotation of the driven scroll when the driving scroll rotates in the positive direction and flows in the rotation direction of the driven scroll. At this time, the guiding surface bends from the through-hole toward the opposite direction of the rotation direction of the driven scroll when the driving scroll rotates in the positive direction and extends toward the inlet. Therefore, the oil present around the bushing and flowing in the rotation direction of the driven scroll is easily guided by the guiding surface toward the through-hole via the inlet. Therefore, the oil from the inlet is easily supplied to the oil sump via the oil passage. As a result, since the oil is efficiently supplied to the bearing, the lubrication of the bearing is better. Therefore, the durability of the scroll compressor can be further improved.

[0022] In the above-described scroll compressor, it is possible that the outer peripheral surface of the eccentric shaft blocks the oil flowing in the oil passage and guides the oil to the oil sump.

[0023] Thus, the oil flowing in the oil passage from the inlet is blocked by the outer peripheral surface of the eccentric shaft and guided to the oil sump. Therefore, the oil from the inlet is easily supplied to the oil sump via the oil passage. As a result, since the oil is efficiently supplied to the bearing, the lubrication of the bearing is better. Therefore, the durability of the scroll compressor can be further improved.

[0024] In the above-described scroll compressor, it is possible that the oil sump is formed on the inner peripheral surface of the through-hole.

[0025] Thus, since the oil sump is also formed in the bushing in which the oil passage is formed, it is easy to set the position of the oil sump relative to the oil passage. Therefore, the structure in which the oil sump is formed on the inner peripheral surface of the through-hole can simplify the design of the scroll compressor.

[0026] In the above-described scroll compressor, it is possible that the oil sump is formed on the outer peripheral surface of the eccentric shaft.

[0027] It is relatively easy to form the oil sump on the outer peripheral surface of the eccentric shaft. In this way, the structure in which the oil sump is formed on the outer peripheral surface of the eccentric shaft can simplify the design of the scroll compressor.

[0028] Advantages of the Invention

[0029] According to the present invention, in a scroll compressor, miniaturization can be achieved and durability can be improved. Description of the Drawings

[0030] Figure 1It is a cross-sectional view of a scroll compressor in the first embodiment.

[0031] Figure 2 It is a cross-sectional view showing a part of the scroll compressor enlarged.

[0032] Figure 3 It is a front view showing a bushing and an eccentric shaft.

[0033] Figure 4 It is a cross-sectional view showing a bushing and an eccentric shaft.

[0034] Figure 5 It is a cross-sectional view of a scroll compressor in the second embodiment.

[0035] Figure 6 It is a cross-sectional view showing a part of the scroll compressor enlarged.

[0036] Figure 7 It is a front view showing a bushing and an eccentric shaft.

[0037] Figure 8 It is a cross-sectional view showing a bushing and an eccentric shaft.

[0038] Figure 9 It is a cross-sectional view showing a bushing and an eccentric shaft in a modified example.

[0039] Figure 10 It is a cross-sectional view showing a bushing and an eccentric shaft in a modified example. Detailed implementation manners

[0040] [First embodiment]

[0041] Hereinafter, Figures 1 to 4 a first embodiment of embodying a scroll compressor will be described. The scroll compressor of the first embodiment is used, for example, in a vehicle air conditioner.

[0042] <Basic structure of scroll compressor 10>

[0043] As Figure 1 shown, the scroll compressor 10 includes a cylindrical housing 11. The housing 11 has a motor housing 12, a shaft support housing 13, and a discharge housing 14. The motor housing 12, the shaft support housing 13, and the discharge housing 14 are made of a metal material. The motor housing 12, the shaft support housing 13, and the discharge housing 14 are, for example, made of aluminum. In addition, the scroll compressor 10 includes a rotating shaft 15 as a support shaft. The rotating shaft 15 is housed in the housing 11.

[0044] The motor housing 12 has a plate-shaped end wall 12a and a cylindrical peripheral wall 12b. The peripheral wall 12b extends cylindrically from the outer peripheral portion of the end wall 12a. The axial direction of the peripheral wall 12b is the same as the axial direction of the rotary shaft 15. The motor housing 12 has a plurality of internal threaded holes 12c. Each internal threaded hole 12c is formed at the open end of the peripheral wall 12b. It should be noted that in Figure 1 for the sake of convenience of explanation, only one internal threaded hole 12c is illustrated. In addition, the motor housing 12 has a suction port 12h. The suction port 12h sucks in the refrigerant. The suction port 12h is formed near the end wall 12a of the peripheral wall 12b. The suction port 12h communicates the inside and outside of the motor housing 12.

[0045] The motor housing 12 has a cylindrical bearing holding portion 12d. The bearing holding portion 12d projects from the central portion of the inner surface of the end wall 12a. One end, i.e., the first end, in the axial direction of the rotary shaft 15 is inserted into the bearing holding portion 12d. The scroll compressor 10 includes a bearing 16. The bearing 16 is, for example, a rolling bearing. The bearing 16 is provided between the inner peripheral surface of the bearing holding portion 12d and the outer peripheral surface of the first end of the rotary shaft 15. And, the first end of the rotary shaft 15 is rotatably supported by the motor housing 12 via the bearing 16.

[0046] The shaft support housing 13 has a plate-shaped end wall 17 and a cylindrical peripheral wall 18. The peripheral wall 18 extends cylindrically from the outer peripheral portion of the end wall 17. The axial direction of the peripheral wall 18 is the same as the axial direction of the rotary shaft 15. In addition, the shaft support housing 13 has an annular flange wall 19. The flange wall 19 extends radially outward of the rotary shaft 15 from the end on the side opposite to the end wall 17 in the outer peripheral surface of the peripheral wall 18.

[0047] The shaft support housing 13 has a circular hole-shaped insertion through-hole 17a. The insertion through-hole 17a is formed at the central portion of the end wall 17. The insertion through-hole 17a penetrates the end wall 17 in the thickness direction. The rotary shaft 15 is inserted through the insertion through-hole 17a. The front end face 15e on the side of the other end, i.e., the second end, in the axial direction of the rotary shaft 15 is located inside the peripheral wall 18.

[0048] The scroll compressor 10 includes a bearing 21. The bearing 21 is, for example, a rolling bearing. The bearing 21 is provided between the inner peripheral surface of the peripheral wall 18 and the outer peripheral surface of the rotary shaft 15. And, the rotary shaft 15 is rotatably supported by the shaft support housing 13 via the bearing 21. Thus, the rotary shaft 15 is supported so as to be rotatable relative to the housing 11. The support shaft in the present embodiment is the rotary shaft 15 that is supported so as to be rotatable relative to the housing 11.

[0049] The shaft support housing 13 has a plurality of bolt insertion holes 19a. Each bolt insertion hole 19a is formed in the outer peripheral portion of the flange wall 19. Each bolt insertion hole 19a penetrates the flange wall 19 in the thickness direction. Each bolt insertion hole 19a of the flange wall 19 communicates with each internal thread hole 12c of the motor housing 12. It should be noted that in Figure 1 only one bolt insertion hole 19a is illustrated for the sake of convenience of explanation.

[0050] The scroll compressor 10 includes a motor chamber 20. The motor chamber 20 is defined by the motor housing 12 and the shaft support housing 13. The motor housing 12 defines the motor chamber 20 together with the shaft support housing 13. Thus, the motor chamber 20 is formed within the housing 11. The motor chamber 20 communicates with the suction port 12h. Refrigerant from the suction port 12h is inhaled into the motor chamber 20.

[0051] The scroll compressor 10 includes a motor 22. The motor 22 is housed within the motor chamber 20. The motor 22 includes a cylindrical stator 23 and a cylindrical rotor 24. The rotor 24 is disposed inside the stator 23. The rotor 24 rotates integrally with the rotating shaft 15. The stator 23 surrounds the rotor 24. The rotor 24 has a rotor core 24a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) provided on the rotor core 24a.

[0052] The stator 23 has a cylindrical stator core 23a and a motor coil 23b. The stator core 23a is fixed to the inner peripheral surface of the peripheral wall 12b of the motor housing 12. The motor coil 23b is wound around the stator core 23a. And electric power controlled by an inverter (not shown) is supplied to the motor coil 23b, whereby the rotor 24 rotates. Thereby, the rotating shaft 15 rotates integrally with the rotor 24. Therefore, the motor 22 rotates the rotating shaft 15.

[0053] The scroll compressor 10 includes a compression mechanism C1. The compression mechanism C1 has a fixed scroll 25 as the first scroll and a orbiting scroll 26 as the second scroll. Therefore, the scroll compressor 10 includes the first scroll and the second scroll. The compression mechanism C1 is a scroll type. The orbiting scroll 26 revolves relative to the fixed scroll 25 by the rotation of the rotating shaft 15.

[0054] The fixed scroll disk 25 has a fixed substrate 25a as the first substrate and a fixed scroll wall 25b as the first scroll wall. The fixed substrate 25a is in the shape of a circular plate. A discharge port 25h is formed at the center of the fixed substrate 25a. The discharge port 25h is in the shape of a circular hole. The discharge port 25h penetrates the fixed substrate 25a in the thickness direction. The fixed scroll wall 25b stands up from the fixed substrate 25a. Thus, the first scroll disk of the present embodiment is the fixed scroll disk 25 having the fixed substrate 25a and the fixed scroll wall 25b. In addition, the fixed scroll disk 25 has an outer peripheral wall 25c. The outer peripheral wall 25c stands up from the outer peripheral portion of the fixed substrate 25a. The outer peripheral wall 25c surrounds the fixed scroll wall 25b.

[0055] The scroll compressor 10 is provided with a valve mechanism 25v. The valve mechanism 25v is installed on the surface of the fixed substrate 25a opposite to the fixed scroll wall 25b. The valve mechanism 25v is configured to be able to open and close the discharge port 25h.

[0056] The orbiting scroll disk 26 has an orbiting substrate 26a as the second substrate and an orbiting scroll wall 26b as the second scroll wall. The orbiting substrate 26a is in the shape of a circular plate. The orbiting substrate 26a faces the fixed substrate 25a. The orbiting scroll wall 26b stands up from the orbiting substrate 26a toward the fixed substrate 25a. The orbiting scroll wall 26b engages with the fixed scroll wall 25b. Thus, the second scroll disk of the present embodiment is the orbiting scroll disk 26 having the orbiting substrate 26a and the orbiting scroll wall 26b. The orbiting scroll disk 26 is located inside the outer peripheral wall 25c. The orbiting scroll disk 26 revolves inside the outer peripheral wall 25c. The front end surface of the fixed scroll wall 25b contacts the orbiting substrate 26a. The front end surface of the orbiting scroll wall 26b contacts the fixed substrate 25a.

[0057] The scroll compressor 10 is provided with a compression chamber 27. The compression chamber 27 is defined by the fixed substrate 25a, the fixed scroll wall 25b, the orbiting substrate 26a, and the orbiting scroll wall 26b. Therefore, the compression chamber 27 is defined and formed between the fixed scroll disk 25 and the orbiting scroll disk 26. The compression chamber 27 takes in refrigerant from the outside and compresses it.

[0058] The scroll compressor 10 is provided with a boss portion 28 as a holding portion. The orbiting substrate 26a has a cylindrical boss portion 28. The boss portion 28 projects from the end surface 26e of the orbiting substrate 26a opposite to the fixed substrate 25a in a cylindrical shape. Therefore, the boss portion 28 is provided on the end surface of the orbiting substrate 26a opposite to the fixed substrate 25a. The axial direction of the boss portion 28 is the same as the axial direction of the rotation shaft 15.

[0059] The orbiting substrate 26a has a plurality of groove portions 26d. The plurality of groove portions 26d are respectively formed around the boss portion 28 on the end surface 26e of the orbiting substrate 26a. The plurality of groove portions 26d are arranged at a predetermined interval in the circumferential direction of the rotation shaft 15. It should be noted thatFigure 1 In this case, for the sake of convenience in explanation, only one groove portion 26d is illustrated. A ring-shaped ring member 29 is fitted in each groove portion 26d. A pin 30 is inserted into each ring member 29. Each pin 30 protrudes from the end face 13e on the side of the swirling scroll 26 of the shaft support housing 13.

[0060] The scroll compressor 10 includes an elastic plate 31. The elastic plate 31 is ring-shaped. The elastic plate 31 is clamped between the end face 13e of the shaft support housing 13 and the open end face of the outer peripheral wall 25c. And the elastic plate 31 always applies a force to the swirling scroll 26 toward the fixed scroll 25.

[0061] The discharge housing 14 has a plate-shaped end wall 14a and a cylindrical peripheral wall 14b. The peripheral wall 14b extends cylindrically from the outer peripheral portion of the end wall 14a. The axial direction of the peripheral wall 14b is the same as the axial direction of the rotating shaft 15. The peripheral wall 14b surrounds the fixed scroll 25. Thus, the fixed scroll 25 is housed in the housing 11.

[0062] The discharge housing 14 has a plurality of bolt insertion holes 14c. Each bolt insertion hole 14c is formed in the peripheral wall 14b. It should be noted that, in Figure 1 for the sake of convenience in explanation, only one bolt insertion hole 14c is illustrated. Each bolt insertion hole 14c communicates with each bolt insertion hole 19a of the flange wall 19.

[0063] The bolts B1 passing through the respective bolt insertion holes 14c are screwed into the respective internal threaded holes 12c of the motor housing 12 through the respective bolt insertion holes 19a of the flange wall 19. Thereby, the shaft support housing 13 is connected to the peripheral wall 12b of the motor housing 12, and the discharge housing 14 is connected to the flange wall 19 of the shaft support housing 13. Thus, the motor housing 12, the shaft support housing 13, and the discharge housing 14 are arranged in this order along the axial direction of the rotating shaft 15. The fixed scroll 25 is clamped by the end wall 14a of the discharge housing 14 and the shaft support housing 13. In this way, the fixed scroll 25 is fixed to the housing 11.

[0064] The scroll compressor 10 is provided with a suction passage 35. The suction passage 35 has a first groove 36, a first hole 37, a second groove 38, and a second hole 39. The first groove 36 is formed in a part of the inner peripheral surface of the peripheral wall 12b of the motor housing 12. The first groove 36 opens at the open end of the peripheral wall 12b. The first hole 37 is formed in the outer peripheral portion of the flange wall 19 of the shaft support housing 13. The first hole 37 penetrates the flange wall 19 in the thickness direction. The first hole 37 communicates with the first groove 36. The second groove 38 is formed in a part of the inner peripheral surface of the peripheral wall 14b of the discharge housing 14. The second groove 38 communicates with the first hole 37. The second hole 39 is formed in the outer peripheral wall 25c of the fixed scroll 25. The second hole 39 penetrates the outer peripheral wall 25c in the thickness direction. The second hole 39 communicates with the second groove 38. The second hole 39 communicates with the outermost peripheral portion of the compression chamber 27.

[0065] The refrigerant in the motor chamber 20 is sucked into the compression chamber 27 through the first groove 36, the first hole 37, the second groove 38, and the second hole 39. The refrigerant sucked into the compression chamber 27 is compressed in the compression chamber 27 by the revolution of the orbiting scroll 26. In this way, the compression mechanism C1 compresses the refrigerant sucked into the housing 11.

[0066] The scroll compressor 10 is provided with a discharge chamber 40. The discharge chamber 40 is partitioned between the fixed base plate 25a and the end wall 14a of the discharge housing 14. The discharge chamber 40 communicates with the discharge port 25h. The refrigerant compressed in the compression chamber 27 is discharged into the discharge chamber 40. In addition, the scroll compressor 10 is provided with an oil storage chamber 41. The oil storage chamber 41 is formed in the end wall 14a of the discharge housing 14.

[0067] The scroll compressor 10 is provided with an oil separation chamber 42. The oil separation chamber 42 is formed inside the discharge housing 14. The oil separation chamber 42 is formed inside a slender cylindrical outer cylinder 43 that is a part of the end wall 14a of the discharge housing 14. The first end of the outer cylinder 43 serves as a discharge port 44 for discharging the refrigerant to the outside. The discharge port 44 communicates with the oil separation chamber 42.

[0068] An inner cylinder 45 is embedded in the oil separation chamber 42. The axial direction of the inner cylinder 45 coincides with the radial direction of the rotating shaft 15. The first end of the inner cylinder 45 communicates with the discharge port 44. The second end of the inner cylinder 45 communicates with the side of the oil separation chamber 42 opposite to the discharge port 44. An introduction hole 46 is formed in the outer cylinder 43. The introduction hole 46 communicates the discharge chamber 40 with the oil separation chamber 42. The introduction hole 46 introduces the refrigerant discharged into the discharge chamber 40 into the oil separation chamber 42.

[0069] An oil drain hole 47 is formed in the discharge housing 14. The first end of the oil drain hole 47 communicates with the side of the oil separation chamber 42 opposite to the discharge port 44. The second end of the oil drain hole 47 communicates with the oil storage chamber 41. The oil separation chamber 42 communicates with the oil storage chamber 41 via the oil drain hole 47.

[0070] The refrigerant compressed in the compression chamber 27 and discharged into the discharge chamber 40 through the discharge port 25h is introduced into the oil separation chamber 42 through the introduction hole 46. The refrigerant introduced into the oil separation chamber 42 swirls around the inner cylinder 45. Thereby, a centrifugal force is applied to the oil contained in the refrigerant, and the oil is separated from the refrigerant in the oil separation chamber 42. Therefore, the oil separation chamber 42 separates the oil contained in the refrigerant discharged into the discharge chamber 40.

[0071] The refrigerant from which the oil has been separated flows into the inner cylinder 45 and passes through the inner cylinder 45. And, the refrigerant passing through the inner cylinder 45 flows out through the discharge port 44 to an external refrigerant circuit (not shown). The oil separated from the refrigerant in the oil separation chamber 42 flows toward the oil drain hole 47. And, the oil flowing toward the oil drain hole 47 is discharged through the oil drain hole 47 into the oil storage chamber 41 and stored in the oil storage chamber 41.

[0072] The scroll compressor 10 is provided with an oil return passage 48. The oil return passage 48 penetrates the discharge housing 14 and the shaft support housing 13 from the oil storage chamber 41 and reaches the inside of the peripheral wall 18 of the shaft support housing 13. Therefore, the oil return passage 48 connects the oil storage chamber 41 and the inside of the peripheral wall 18 of the shaft support housing 13. And, the oil stored in the oil storage chamber 41 flows back through the oil return passage 48 to the inside of the peripheral wall 18 of the shaft support housing 13.

[0073] The scroll compressor 10 is provided with an eccentric shaft 50. The eccentric shaft 50 protrudes from the front end face 15e of the rotating shaft 15 and extends parallel to the rotating shaft 15 at a position eccentric with respect to the axis L1 of the rotating shaft 15. The eccentric shaft 50 is integrally formed with the rotating shaft 15. The axial direction of the eccentric shaft 50 coincides with the axial direction of the rotating shaft 15. The eccentric shaft 50 protrudes from the front end face 15e of the rotating shaft 15 toward the orbiting scroll 26. The eccentric shaft 50 is inserted into the boss portion 28.

[0074] <Bushing 51>

[0075] As Figure 2 shown, the scroll compressor 10 is provided with a bushing 51. The bushing 51 has a bushing cylinder portion 52 and a bushing flange portion 53. The inside of the bushing cylinder portion 52 becomes a through hole 54. Therefore, the bushing 51 has the through hole 54. The eccentric shaft 50 is inserted into the through hole 54. The bushing cylinder portion 52 is disposed inside the boss portion 28. Therefore, the bushing 51 is disposed inside the boss portion 28.

[0076] The end of the bushing sleeve portion 52 on the side opposite to the revolving substrate 26a protrudes from the boss portion 28. The bushing flange portion 53 protrudes outward in a ring shape from the end of the bushing sleeve portion 52 on the side opposite to the revolving substrate 26a. The bushing flange portion 53 overlaps with the end face of the boss portion 28 in the axial direction of the boss portion 28. The bushing 51 can swing (rock) around the eccentric shaft 50.

[0077] The scroll compressor 10 is provided with a balance weight 55. The balance weight 55 is integrated with the bushing 51. The balance weight 55 is integrally formed with the bushing 51. The balance weight 55 protrudes outward from a part of the outer peripheral surface of the bushing flange portion 53. The balance weight 55 is housed inside the peripheral wall 18 of the shaft support housing 13.

[0078] <Bearing 56>

[0079] The scroll compressor 10 is provided with a bearing 56. The bearing 56 is a cylindrical sliding bearing. The bearing 56 has a bearing cylinder portion 57 and a bearing flange portion 58. The bearing cylinder portion 57 is disposed inside the boss portion 28. And, the bearing cylinder portion 57 is disposed between the inner peripheral surface of the boss portion 28 and the outer peripheral surface of the bushing sleeve portion 52. Therefore, the bearing 56 is disposed between the inner peripheral surface of the boss portion 28 and the outer peripheral surface of the bushing 51. The bushing 51 is rotatably held on the boss portion 28 via the bearing 56.

[0080] The end of the bearing cylinder portion 57 on the side opposite to the revolving substrate 26a protrudes from the boss portion 28. The bearing flange portion 58 protrudes outward in a ring shape from the end of the bearing cylinder portion 57 on the side opposite to the revolving substrate 26a. The bearing flange portion 58 is disposed between the end face of the boss portion 28 and the bushing flange portion 53. The bearing 56 is prevented from coming off the boss portion 28 by the bearing flange portion 58 abutting against the bushing flange portion 53.

[0081] The rotation of the rotating shaft 15 is transmitted to the revolving scroll 26 via the eccentric shaft 50, the bushing 51, and the bearing 56. Thus, the revolving scroll 26 rotates about its own axis. And, by the respective pins 30 contacting the inner peripheral surface of the respective ring members 29, the rotation of the revolving scroll 26 is blocked, and only the revolving motion of the revolving scroll 26 is allowed. Thus, the revolving scroll 26 makes a revolving motion while bringing the revolving scroll wall 26b into contact with the fixed scroll wall 25b. And, as the revolving scroll 26 makes a revolving motion, the volume of the compression chamber 27 decreases, and thus the refrigerant is compressed in the compression chamber 27. The revolving scroll 26 revolves inside the outer peripheral wall 25c as the rotating shaft 15 rotates. The balance weight 55 cancels out the centrifugal force acting on the revolving scroll 26 when the revolving scroll 26 makes a revolving motion. Thus, the unbalance amount of the revolving scroll 26 is reduced.

[0082] <Driven crank mechanism 59>

[0083] The center L2 of the bush sleeve portion 52 is located at a position radially outside the axis L1 of the rotating shaft 15 with respect to the axis L1 of the rotating shaft 15. The center of the revolving substrate 26a coincides with the center L2 of the bush sleeve portion 52. Moreover, the distance between the center L2 of the bush sleeve portion 52 and the axis L1 of the rotating shaft 15 becomes the revolution radius of the revolving scroll 26.

[0084] The bush 51 swings around the eccentric shaft 50, so that the distance between the center L2 of the bush 51 and the axis L1 of the rotating shaft 15 changes. Therefore, the revolution radius of the revolving scroll 26 is variable. In this way, the eccentric shaft 50, the bush 51, and the bearing 56 constitute a so-called slave crank mechanism 59 that makes the revolution radius of the revolving scroll 26 variable. Such a slave crank mechanism 59 is already known.

[0085] As Figure 3 shown, the through hole 54 has a center L3 at a position eccentric with respect to the center L2 of the bush sleeve portion 52. Therefore, in the bush sleeve portion 52, the wall thickness of the portion closer to the center L3 of the through hole 54 than the center L2 of the bush sleeve portion 52 is smaller than the wall thickness of the portion closer to the center L2 of the bush sleeve portion 52 than the center L3 of the through hole 54.

[0086] <Compressive load F1>

[0087] The compressive load F1 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50 from the revolving scroll 26. The compressive load F1 acts on the eccentric shaft 50 from the revolving scroll 26 via the bearing 56 and the bush 51. The compressive load F1 is uniquely determined by the shapes of the fixed scroll wall 25b and the revolving scroll wall 26b, the pressure of the refrigerant compressed in the compression chamber 27, etc. The position A1 where the compressive load F1 transmitted from the revolving scroll 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50 is grasped in advance through experiments, etc. In the present embodiment, the compressive load F1 acts on the eccentric shaft 50 from the portion of the bush sleeve portion 52 closer to the center L3 of the through hole 54 than the center L2 of the bush sleeve portion 52.

[0088] <Function of the slave crank mechanism 59>

[0089] The fixed scroll 25 and the revolving scroll 26 have minute machining errors and assembly errors. Therefore, a gap is provided in advance between the fixed scroll wall 25b and the revolving scroll wall 26b.

[0090] When the rotating shaft 15 rotates in the positive direction, the bushing 51 swings about the eccentric shaft 50 based on the compressive load F1 acting on the swirling scroll disk 26. When the bushing 51 swings about the eccentric shaft 50, the distance between the center L2 of the bushing 51 and the axis L1 of the rotating shaft 15 increases, and the revolution radius of the swirling scroll disk 26 increases. Also, at the moment when the swirling scroll wall 26b contacts the fixed scroll wall 25b, the swing of the bushing 51 about the eccentric shaft 50 is restricted. Thereby, the revolution radius of the swirling scroll disk 26 is fixed.

[0091] Also, the rotation of the rotating shaft 15 is transmitted to the swirling scroll disk 26 via the eccentric shaft 50, the bushing 51, and the bearing 56, so the swirling scroll disk 26 rotates in the positive direction about its own axis. Also, at the moment when the swirling scroll wall 26b contacts the fixed scroll wall 25b, the pin 30 contacts the ring member 29. Thereby, the rotation of the swirling scroll disk 26 about its own axis is blocked, and only the revolution motion of the swirling scroll disk 26 in the positive direction is allowed. Also, the swirling scroll disk 26 revolves in the positive direction while bringing the swirling scroll wall 26b into contact with the fixed scroll wall 25b. Therefore, leakage of the refrigerant from the compression chamber 27 can be suppressed, and the volume of the compression chamber 27 decreases to compress the refrigerant.

[0092] When assembling the swirling scroll disk 26 relative to the fixed scroll disk 25, the bushing 51 is made to swing about the eccentric shaft 50 in a direction opposite to the direction in which the rotating shaft 15 rotates in the positive direction. Then, the distance between the center L2 of the bushing 51 and the axis L1 of the rotating shaft 15 decreases, and the revolution radius of the swirling scroll disk 26 decreases. Thereby, the position of the swirling scroll wall 26b relative to the fixed scroll wall 25b becomes a position where the swirling scroll wall 26b does not contact the fixed scroll wall 25b. Therefore, the swirling scroll disk 26 can be easily assembled to the fixed scroll disk 25.

[0093] Note that when the bushing 51 swings about the eccentric shaft 50 in a direction opposite to the direction in which the rotating shaft 15 rotates in the positive direction, the swing of the bushing 51 is restricted until the distance between the center L2 of the bushing 51 and the axis L1 of the rotating shaft 15 increases. When the bushing 51 swings about the eccentric shaft 50 in a direction opposite to the direction in which the rotating shaft 15 rotates in the positive direction, the swing of the bushing 51 is restricted when the distance between the center L2 of the bushing 51 and the axis L1 of the rotating shaft 15 becomes the shortest distance.

[0094] <Oil passage 60>

[0095] As Figure 2 shown, the bushing 51 has an oil passage 60. The oil passage 60 is formed in the opposed surface 51a of the bushing 51 that faces the front end surface 15e of the rotating shaft 15.

[0096] As Figure 4As shown, the oil passage 60 extends from the through hole 54 toward the outer peripheral surface of the bushing flange portion 53. Therefore, the oil passage 60 extends from the through hole 54 toward the outer peripheral surface of the bushing 51. Further, the oil passage 60 has an inlet 61 that opens to the outer peripheral surface of the bushing flange portion 53. Therefore, the oil passage 60 has an inlet 61 that opens to the outer peripheral surface of the bushing 51. The first end of the oil passage 60 is the inlet 61 that opens to the outer peripheral surface of the bushing 51. The second end of the oil passage 60 communicates with the through hole 54.

[0097] The oil passage 60 is defined by a passage forming recess 62 formed in the opposed surface 51a. The passage forming recess 62 has a bottom surface 63, a first side surface 64, and a second side surface 65 that stands upright from the bottom surface 63. The bottom surface 63 connects the first side surface 64 and the second side surface 65 to each other. The bottom surface 63 is continuous with the through hole 54. The bottom surface 63 extends from the through hole 54 toward the outer peripheral surface of the bushing flange portion 53.

[0098] In Figure 4 the rotation direction of the bushing 51 when the rotary shaft 15 rotates in the positive direction is indicated by an arrow R1. The first side surface 64 is located on the leading side with respect to the rotation direction of the bushing 51 when the rotary shaft 15 rotates in the positive direction, as compared with the second side surface 65. The first side surface 64 and the second side surface 65 extend from the outer peripheral surface of the eccentric shaft 50 toward the outer peripheral surface of the bushing flange portion 53.

[0099] The first side surface 64 and the second side surface 65 are bent from the outer peripheral surface of the eccentric shaft 50 toward the rotation direction of the bushing 51 when the rotary shaft 15 rotates in the positive direction. Accordingly, the first side surface 64 and the second side surface 65 each have a guide surface 66 that bends from the through hole 54 toward the rotation direction of the bushing 51 when the rotary shaft 15 rotates in the positive direction and extends toward the inlet 61. Accordingly, the oil passage 60 has a guide surface 66 that bends from the through hole 54 toward the rotation direction of the bushing 51 when the rotary shaft 15 rotates in the positive direction and extends toward the inlet 61. Each guide surface 66 guides the oil flowing in the oil passage 60 toward the through hole 54.

[0100] <Oil sump 70>

[0101] As Figure 3As shown, an oil groove 70 is formed on the inner peripheral surface of the through hole 54. Therefore, the oil groove 70 is formed on the inner peripheral surface of the through hole 54. The oil groove 70 is formed in a part of the inner peripheral surface of the through hole 54 that is closer to the center L2 of the bush sleeve portion 52 than the center L3 of the through hole 54. Therefore, the oil groove 70 is formed on the inner peripheral surface of the through hole 54 and at a position where the phase is different from the position where the compressive load F1 transmitted from the swirling vortex disk 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50. Therefore, the oil groove 70 is formed on the inner peripheral surface of the through hole 54 and in a part other than the position where the compressive load F1 transmitted from the swirling vortex disk 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50.

[0102] As Figure 2 shown, the first end of the oil groove 70 communicates with the second end of the oil passage 60. The second end of the oil groove 70 opens at the end face on the swirling scroll wall 26b side in the bush 51. The oil groove 70 connects the second end of the oil passage 60 with the space 71 between the end face on the swirling scroll wall 26b side in the bush 51 and the swirling base plate 26a.

[0103] As Figure 4 shown, the outer peripheral surface of the eccentric shaft 50 closes the second end of the oil passage 60. The outer peripheral surface of the eccentric shaft 50 blocks the oil flowing in the oil passage 60 and guides it to the oil groove 70.

[0104] [Function of the First Embodiment]

[0105] Next, the function of the first embodiment will be described.

[0106] The oil stored in the oil storage chamber 41 flows back into the peripheral wall 18 of the shaft support housing 13 via the oil return passage 48. And the oil existing around the outer peripheral surface of the bush 51 flows into the oil passage 60 from the inlet 61 and is supplied to the oil groove 70. At this time, the oil from the inlet 61 is guided by the guide surface 66 toward the through hole 54, so the oil from the inlet 61 can be easily supplied to the oil groove 70 via the oil passage 60. In addition, the oil flowing through the oil passage 60 from the inlet 61 is blocked by the outer peripheral surface of the eccentric shaft 50 and is guided to the oil groove 70, so the oil from the inlet 61 can be easily supplied to the oil groove 70 via the oil passage 60.

[0107] The oil supplied to the oil groove 70 flows out through the oil groove 70 to the space 71 between the end face on the swirling base plate 26a side in the bush 51 and the swirling base plate 26a. And the oil flowing out to the space 71 is supplied to the bearing 56. Thereby, the lubrication of the bearing 56 becomes good.

[0108] [Effect of the First Embodiment]

[0109] The following effects can be obtained in the first embodiment.

[0110] (1-1) The opposing surface 51a of the bushing 51 that opposes the front end surface 15e of the rotating shaft 15 has an oil passage 60. The oil passage 60 has an inlet 61 that extends from the through hole 54 toward the outer peripheral surface of the bushing 51 and opens at the outer peripheral surface of the bushing 51. An oil groove 70 is formed on the inner peripheral surface of the through hole 54 and in a portion other than the portion where the compressive load F1 transmitted from the orbiting scroll 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50. The oil groove 70 communicates with the oil passage 60 and opens at the end surface on the side of the orbiting scroll wall 26b of the bushing 51. Thus, the oil present around the bushing 51 flows into the oil passage 60 from the inlet 61 and is supplied to the oil groove 70. The oil supplied to the oil groove 70 flows out through the oil groove 70 to the space 71 between the end surface on the side of the orbiting scroll wall 26b of the bushing 51 and the orbiting substrate 26a. And the oil flowing out to the space 71 is supplied to the bearing 56. Thus, the lubrication of the bearing 56 becomes good, and therefore the durability of the scroll compressor 10 is improved.

[0111] The oil groove 70 is formed on the inner peripheral surface of the through hole 54. Therefore, unlike the prior art, it is not necessary to form a through hole different from the through hole 54 into which the eccentric shaft 50 is inserted in the bushing 51 in order to supply oil to the bearing 56. Therefore, it is not necessary to ensure the wall thickness of the bushing 51. As a result, it is possible to avoid the enlargement of the bushing 51. Therefore, miniaturization of the scroll compressor 10 can be achieved. In addition, the oil groove 70 is formed on the inner peripheral surface of the through hole 54 and in a portion other than the portion where the compressive load F1 transmitted from the orbiting scroll 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50. Therefore, even if the oil groove 70 is formed on the inner peripheral surface of the through hole 54, the swing of the bushing 51 around the eccentric shaft 50 is not hindered by the oil groove 70. Thus, in the scroll compressor 10, miniaturization can be achieved and durability can be improved.

[0112] (1-2) Thus, in the scroll compressor 10 having the fixed scroll 25 and the orbiting scroll 26, miniaturization can be achieved and durability can be improved.

[0113] (1-3) The oil passage 60 has a guide surface 66 that bends from the through hole 54 toward the rotation direction of the bushing 51 when the rotating shaft 15 rotates in the positive direction and extends toward the inlet 61. The guide surface 66 guides the oil flowing in the oil passage 60 toward the through hole 54. Thus, the oil from the inlet 61 is guided by the guide surface 66 toward the through hole 54, so the oil from the inlet 61 is easily supplied to the oil groove 70 via the oil passage 60. As a result, oil is efficiently supplied to the bearing 56, and therefore the lubrication of the bearing 56 is better. Therefore, the durability of the scroll compressor 10 can be further improved.

[0114] (1-4) The outer peripheral surface of the eccentric shaft 50 blocks the oil flowing in the oil passage 60 and guides the oil to the oil sump 70. Thus, the oil flowing through the oil passage 60 from the inlet 61 is blocked by the outer peripheral surface of the eccentric shaft 50 and guided to the oil sump 70. Therefore, the oil from the inlet 61 can be easily supplied to the oil sump 70 via the oil passage 60. As a result, the oil is efficiently supplied to the bearing 56, so that the lubrication of the bearing 56 is better. Therefore, the durability of the scroll compressor 10 can be further improved.

[0115] (1-5) The oil sump 70 is formed on the inner peripheral surface of the through hole 54. Thus, since the oil sump 70 is also formed in the bushing 51 in which the oil passage 60 is formed, the position of the oil sump 70 relative to the oil passage 60 can be easily set. Therefore, the structure in which the oil sump 70 is formed on the inner peripheral surface of the through hole 54 can simplify the design of the scroll compressor 10.

[0116] [Second Embodiment]

[0117] Hereinafter, Figures 5 to 8 A second embodiment in which the scroll compressor is embodied will be described. It should be noted that, in the embodiments described below, the same reference numerals are given to the same structures as those in the first embodiment already described, and the repeated descriptions thereof are omitted or simplified. The scroll compressor of the second embodiment is a double-rotary scroll compressor.

[0118] <Basic Structure of Scroll Compressor 100>

[0119] As Figure 5 shown, the scroll compressor 100 includes a housing 101. The housing 101 has a housing main body 102 and a housing cover 103. The housing main body 102 and the housing cover 103 are made of a metal material. The housing main body 102 and the housing cover 103 are made of aluminum, for example.

[0120] The housing main body 102 has a disk-shaped end wall 102a and a cylindrical peripheral wall 102b. The peripheral wall 102b extends from the outer peripheral portion of the end wall 102a. The housing main body 102 has a suction port 104. The suction port 104 sucks in the refrigerant. The suction port 104 is formed in the end wall 102a, for example. The suction port 104 communicates the inside and outside of the housing main body 102.

[0121] The scroll compressor 100 includes a support shaft 105. The support shaft 105 is provided in the housing main body 102. Therefore, the support shaft 105 is supported by the housing 101. The support shaft 105 projects from the central portion of the inner surface of the end wall 102a of the housing main body 102. The axis L11 of the support shaft 105 coincides with the axis of the peripheral wall 102b of the housing main body 102. The support shaft 105 is integrally formed with the housing main body 102.

[0122] The housing cover 103 is plate-shaped. The housing cover 103 is connected to the end of the peripheral wall 102b of the housing body 102 on the side opposite to the end wall 102a. The housing cover 103 is connected to the housing body 102 in a state where the opening of the peripheral wall 102b is closed. And, a scroll chamber 106 is defined by the housing body 102 and the housing cover 103. Therefore, the housing 101 defines the scroll chamber 106. The refrigerant from the suction port 104 is sucked into the scroll chamber 106.

[0123] The housing cover 103 has a bearing holding portion 107. The bearing holding portion 107 is cylindrical and protrudes from the central portion of the inner surface of the housing cover 103. The axis of the bearing holding portion 107 coincides with the axis of the peripheral wall 102b of the housing body 102. The bearing holding portion 107 holds the bearing 108. The bearing 108 is, for example, a needle bearing. The housing cover 103 has a discharge port 109. The discharge port 109 penetrates the central portion of the housing cover 103. The discharge port 109 communicates with the inside of the bearing holding portion 107.

[0124] The scroll compressor 100 includes a motor 110. The motor 110 is housed in the scroll chamber 106. Therefore, the scroll chamber 106 also serves as a motor chamber for housing the motor 110. The motor 110 includes a cylindrical stator 111 and a cylindrical rotor 112. The stator 111 has a cylindrical stator core 113 and a motor coil 114. The stator core 113 is fixed to the inner peripheral surface of the peripheral wall 102b of the housing body 102. The motor coil 114 is wound around the stator core 113. The rotor 112 is disposed inside the stator 111. The rotor 112 has a cylindrical rotor core 115 and a plurality of permanent magnets (not shown) provided on the rotor core 115.

[0125] The scroll compressor 100 includes a compression mechanism 116. The compression mechanism 116 is housed in the scroll chamber 106. The compression mechanism 116 includes a drive scroll 117 as the first scroll disk and a driven scroll 118 as the second scroll disk. The compression mechanism 116 is a scroll type. The driven scroll 118 rotates following the rotation of the drive scroll 117.

[0126] The drive scroll 117 has a drive substrate 117a as the first substrate and a drive scroll wall 117b as the first scroll wall. The drive substrate 117a is circular plate-shaped. A discharge port 119 is formed in the central portion of the drive substrate 117a. The discharge port 119 is circular hole-shaped. The discharge port 119 penetrates the drive substrate 117a in the thickness direction. The drive scroll wall 117b stands up from the drive substrate 117a. Thus, the first scroll disk of the present embodiment is the drive scroll having the drive substrate 117a and the drive scroll wall 117b.

[0127] The outer peripheral portion of the surface of the drive substrate 117a on the side of the drive scroll wall 117b contacts the first end face of the rotor core 115. The drive scroll wall 117b is located inside the rotor core 115. Therefore, the rotor core 115 surrounds the drive scroll wall 117b.

[0128] The drive scroll disk 117 has a first boss portion 120. The first boss portion 120 protrudes from the central portion of the surface of the drive substrate 117a on the side opposite to the drive scroll wall 117b. The first boss portion 120 is cylindrical. The drive scroll disk 117 is housed in the scroll chamber 106 in a state where the axis of the first boss portion 120 coincides with the axis L11 of the support shaft 105. The inside of the first boss portion 120 communicates with the discharge port 119. The first boss portion 120 enters the inside of the bearing holding portion 107. The first boss portion 120 is rotatably supported by the bearing holding portion 107 via the bearing 108.

[0129] The drive scroll disk 117 has a drive cover body 121. The drive cover body 121 has a disk-shaped cover end wall 121a and a cylindrical cover peripheral wall 121b. The cover peripheral wall 121b extends from the outer peripheral portion of the cover end wall 121a. The drive cover body 121 is housed in the scroll chamber 106 in a state where the axis of the cover peripheral wall 121b coincides with the axis L11 of the support shaft 105.

[0130] The inner diameter of the cover peripheral wall 121b is the same as the inner diameter of the rotor core 115. The end face of the cover peripheral wall 121b on the opening side abuts against the second end face of the rotor core 115 in a state where the inner peripheral surface of the cover peripheral wall 121b and the inner peripheral surface of the rotor core 115 are on the same plane. And, the cover peripheral wall 121b and the drive substrate 117a sandwich the rotor core 115 together. The drive substrate 117a, the rotor core 115, and the cover peripheral wall 121b are connected by a plurality of bolts 122. Therefore, the drive scroll disk 117 is integrated with the rotor 112. The drive scroll disk 117 can rotate integrally with the rotor 112.

[0131] The drive cover body 121 has a second boss portion 123. The second boss portion 123 protrudes from the central portion of the surface of the cover end wall 121a on the side opposite to the cover peripheral wall 121b. The second boss portion 123 is cylindrical. The axis of the second boss portion 123 coincides with the axis of the cover peripheral wall 121b. The cover end wall 121a has an insertion hole 124. The insertion hole 124 penetrates the cover end wall 121a in the thickness direction. The insertion hole 124 communicates with the inside of the second boss portion 123. The diameter of the insertion hole 124 is the same as the inner diameter of the second boss portion 123. The inner peripheral surface of the insertion hole 124 and the inner peripheral surface of the second boss portion 123 are on the same plane.

[0132] The support shaft 105 is inserted inside the second boss portion 123 and into the insertion through-hole 124. A bearing 125 is provided between the support shaft 105, the second boss portion 123, and the insertion through-hole 124. The bearing 125 is, for example, a sliding bearing. Further, the drive housing 121 is rotatably supported by the support shaft 105 via the bearing 125. Thus, the drive scroll 117 rotates about the axis L11 of the support shaft 105.

[0133] The drive housing 121 has a plurality of groove portions 126. The plurality of groove portions 126 are formed on the surface of the housing end wall 121a on the side of the housing peripheral wall 121b. Each groove portion 126 is a circular hole-shaped recess. The plurality of groove portions 126 are arranged at a prescribed interval in the circumferential direction of the housing peripheral wall 121b around the insertion through-hole 124. A ring-shaped ring member 127 is fitted in each groove portion 126.

[0134] The drive housing 121 has a suction port 121h. The suction port 121h is formed in the outer peripheral portion of the housing end wall 121a. The suction port 121h sucks the refrigerant sucked into the scroll chamber 106 from the suction port 104 to the inside of the housing peripheral wall 121b.

[0135] The scroll compressor 100 includes a valve mechanism 128. The valve mechanism 128 is attached to the surface of the drive substrate 117a on the side opposite to the drive scroll wall 117b. The valve mechanism 128 is configured to be able to open and close the discharge port 119.

[0136] The driven scroll 118 has a driven substrate 118a as a second substrate and a driven scroll wall 118b as a second scroll wall. The driven substrate 118a is in the shape of a disk. The driven substrate 118a faces the drive substrate 117a. The driven scroll wall 118b stands up from the driven substrate 118a toward the drive substrate 117a. The driven scroll wall 118b meshes with the drive scroll wall 117b. Thus, the second scroll of the present embodiment is the driven scroll 118 having the driven substrate 118a and the driven scroll wall 118b.

[0137] The driven scroll 118 is disposed inside the housing peripheral wall 121b and the rotor core 115. The front end surface of the drive scroll wall 117b contacts the driven substrate 118a. The front end surface of the driven scroll wall 118b contacts the drive substrate 117a.

[0138] The scroll compressor 100 includes a compression chamber 129. The compression chamber 129 is defined by the drive substrate 117a, the drive scroll wall 117b, the driven substrate 118a, and the driven scroll wall 118b. Therefore, the compression chamber 129 is defined and formed between the drive scroll 117 and the driven scroll 118. The compression chamber 129 takes in the refrigerant from the suction port 121h and compresses it.

[0139] The scroll compressor 100 includes a holding portion 130. The holding portion 130 is formed on the driven base plate 118a. The holding portion 130 is a circular hole-shaped recess formed in the central portion of the surface of the driven base plate 118a on the side opposite to the driven scroll wall 118b. Therefore, the holding portion 130 is a cylindrical shape provided on the end face of the driven base plate 118a on the side opposite to the drive base plate 117a. A plurality of pins 131 project from the end face of the driven base plate 118a on the side opposite to the drive base plate 117a. Each pin 131 is inserted into each ring member 127.

[0140] As Figure 6 shown, the scroll compressor 100 includes an eccentric shaft 132. The eccentric shaft 132 projects from the front end face 105a of the support shaft 105. The eccentric shaft 132 extends parallel to the support shaft 105 at a position eccentric with respect to the axis L11 of the support shaft 105. The eccentric shaft 1321 is fixed to the support shaft 105 by being press-fitted into a press-fitting hole 105h formed in the front end face 105a of the support shaft 105. The eccentric shaft 132 is inserted into the inside of the holding portion 130.

[0141] <Bushing 133>

[0142] The scroll compressor 100 includes a bushing 133. The bushing 133 is cylindrical. The inside of the bushing 133 forms a through hole 134. Therefore, the bushing 133 has the through hole 134. The eccentric shaft 132 is inserted into the through hole 134. The bushing 133 is disposed inside the holding portion 130. Therefore, the bushing 133 is disposed inside the holding portion 130. The bushing 133 can swing (rock) about the eccentric shaft 132.

[0143] <Bearing 135>

[0144] The scroll compressor 100 includes a bearing 135. The bearing 135 is disposed inside the holding portion 130. The bearing 135 is disposed between the inner peripheral surface of the holding portion 130 and the outer peripheral surface of the bushing 133. The bushing 133 is held by the holding portion 130 via the bearing 135.

[0145] <Operations of the drive scroll 117 and the driven scroll 118>

[0146] As Figure 5 shown, in the scroll compressor 100, power controlled by an inverter (not shown) is supplied to the motor coil 114, so that the rotor 112 rotates. Then, as the rotor 112 rotates, the drive scroll 117 rotates about the axis L11 of the support shaft 105 as the rotation center. And the rotation of the drive scroll 117 is transmitted to the driven scroll 118 through the sliding contact of each pin 131 with each ring member 127.

[0147] As Figure 6As shown, the driven scroll 118 rotates about the center L12 of the bush 133. At this time, through the contact of each pin 131 with each ring member 127, the driven scroll 118 revolves relative to the driving scroll 117. As a result, the driven scroll 118 rotates while the driven scroll wall 118b contacts the driving scroll wall 117b. In this way, the driven scroll 118 rotates following the rotation of the driving scroll 117. And, with the rotational movements of the driving scroll 117 and the driven scroll 118, the volume of the compression chamber 129 decreases, whereby the refrigerant is compressed in the compression chamber 129.

[0148] The center L12 of the bush 133 is located at a position radially outside the axis L11 of the support shaft 105 with respect to the axis L11 of the support shaft 105. The center of the driven base plate 118a coincides with the center L12 of the bush 133. And, the distance between the center L12 of the bush 133 and the axis L11 of the support shaft 105 becomes the revolution radius of the driven scroll 118 that revolves relative to the driving scroll 117.

[0149] By swinging the bush 133 about the eccentric shaft 132, the distance between the center L12 of the bush 133 and the axis L11 of the support shaft 105 changes. In this way, the eccentric shaft 132, the bush 133, and the bearing 135 constitute a so-called driven crank mechanism 136 that makes the distance between the center L12 of the bush 133 and the axis L11 of the support shaft 105 variable. Such a driven crank mechanism 136 is already known.

[0150] As Figure 7 shown, the through-hole 134 has a center L13 at a position eccentric with respect to the center L12 of the bush 133. Therefore, in the bush 133, the wall thickness of the portion closer to the center L13 of the through-hole 134 is smaller than the wall thickness of the portion closer to the center L12 of the bush 133 compared to the center L13 of the through-hole 134.

[0151] <Compression Load F1>

[0152] A compressive load F1 acts between the inner peripheral surface of the through-hole 134 and the outer peripheral surface of the eccentric shaft 132 from the driven scroll 118. The compressive load F1 acts on the eccentric shaft 132 from the driven scroll 118 via the bearing 108 and the bushing 133. The compressive load F1 is uniquely determined by the shapes of the driving scroll wall 117b and the driven scroll wall 118b, the pressure of the refrigerant compressed in the compression chamber 129, etc. Moreover, the compressive load F1 is also uniquely determined by the eccentric direction of the eccentric shaft 132 with respect to the axis L11 of the support shaft 105. The portion A1 where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through-hole 134 and the outer peripheral surface of the eccentric shaft 132 is previously grasped by experiments or the like. In the present embodiment, the compressive load F1 acts on the eccentric shaft 132 from a portion of the bushing 133 that is closer to the center L13 of the through-hole 134 than the center L12 of the bushing 133.

[0153] <Function of the driven crank mechanism 136>

[0154] Since the driving scroll 117 and the driven scroll 118 have minute machining errors and assembly errors, a clearance (gap) is previously provided between the driving scroll wall 117b and the driven scroll wall 118b.

[0155] When the driving scroll 117 rotates in the positive direction, the driven scroll 118 follows and rotates in the positive direction. Then, the bushing 133 swings about the eccentric shaft 132 based on the compressive load F1 acting on the driven scroll 118. If the bushing 133 swings about the eccentric shaft 132, the distance between the center L12 of the bushing 133 and the axis L11 of the support shaft 105 increases. And, at the moment when the driven scroll wall 118b contacts the driving scroll wall 117b, the swing of the bushing 133 about the eccentric shaft 132 is restricted. Thereby, the distance between the center L12 of the bushing 133 and the axis L11 of the support shaft 105 is fixed.

[0156] When assembling the driven scroll 118 to the driving scroll 117, the bushing 133 is swung about the eccentric shaft 132 in a direction opposite to the direction in which the driving scroll 117 rotates in the positive direction. Then, the distance between the center L12 of the bushing 133 and the axis L11 of the support shaft 105 decreases. Thereby, the position of the driven scroll wall 118b with respect to the driving scroll wall 117b becomes a position where the driven scroll wall 118b does not contact the driving scroll wall 117b. Therefore, the driven scroll 118 can be easily assembled to the driving scroll 117.

[0157] It should be noted that when the bushing 133 swings around the eccentric shaft 132 in the direction opposite to the positive rotation direction of the drive scroll 117, the swing of the bushing 133 is restricted until the distance between the center L12 of the bushing 133 and the axis L11 of the support shaft 105 increases. When the bushing 133 swings around the eccentric shaft 132 in the direction opposite to the positive rotation direction of the drive scroll 117, the swing of the bushing 133 is restricted when the distance between the center L12 of the bushing 133 and the axis L11 of the support shaft 105 becomes the shortest distance.

[0158] <Oil passage 137>

[0159] As Figure 6 shown, the bushing 133 has an oil passage 137. The oil passage 137 is formed in the opposing surface 133a of the bushing 133 that faces the front end surface 105a of the support shaft 105.

[0160] As Figure 8 shown, the oil passage 137 extends from the through hole 134 toward the outer peripheral surface of the bushing 133. And, the oil passage 137 has an inlet 139 that opens to the outer peripheral surface of the bushing 133. The first end of the oil passage 137 is the inlet 139 that opens to the outer peripheral surface of the bushing 133. The second end of the oil passage 137 communicates with the through hole 134.

[0161] The inlet 139 opens in a portion of the outer peripheral surface of the bushing 133 that is above the vertical direction Z1. The inlet 139 opens in the outer peripheral surface of the bushing 133 in a portion that is above the imaginary plane 140 that passes through the center L12 of the bushing 133 in the horizontal direction and above the vertical direction Z1. The bushing 133 is held by the holding portion 130 in such a manner that the inlet 139 opens in a portion of the outer peripheral surface of the bushing 133 that is above the vertical direction Z1 in a state where the swing of the bushing 133 around the eccentric shaft 132 in the bushing 133 is restricted.

[0162] The oil passage 137 is demarcated by a passage forming recess 141 formed in the opposing surface 133a. The passage forming recess 141 has a bottom surface 142 and a first side surface 143 and a second side surface 144 erected from the bottom surface 142. The bottom surface 142 connects the first side surface 143 and the second side surface 144 to each other. The bottom surface 142 is continuous with the through hole 134. The bottom surface 142 extends from the through hole 134 toward the outer peripheral surface of the bushing 133.

[0163] In Figure 8In this case, the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction is indicated by an arrow R2. The first side surface 143 is located at a position on the leading side of the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction with respect to the second side surface 144. The first side surface 143 and the second side surface 144 extend from the outer peripheral surface of the eccentric shaft 132 toward the outer peripheral surface of the bushing 133.

[0164] The first side surface 143 and the second side surface 144 are bent in a direction opposite to the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction from the outer peripheral surface of the eccentric shaft 132. Accordingly, the first side surface 143 and the second side surface 144 each have a guide surface 145 that bends from the through-hole 134 in a direction opposite to the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and extends toward the inlet 139. Accordingly, the oil passage 137 has a guide surface 145 that bends from the through-hole 134 in a direction opposite to the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and extends toward the inlet 139. Each guide surface 145 guides the oil flowing in the oil passage 137 toward the through-hole 134.

[0165] <Oil groove 146>

[0166] As Figure 7 shown, an oil groove 146 is formed on the inner peripheral surface of the through-hole 134. The oil groove 146 is formed in a portion of the inner peripheral surface of the through-hole 134 that is closer to the center L12 of the bushing 133 than the center L13 of the through-hole 134. Accordingly, the oil groove 146 is formed on the inner peripheral surface of the through-hole 134 and in a portion having a different phase from the portion where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through-hole 134 and the outer peripheral surface of the eccentric shaft 132. Accordingly, the oil groove 146 is formed on the inner peripheral surface of the through-hole 134 and in a portion other than the portion where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through-hole 134 and the outer peripheral surface of the eccentric shaft 132.

[0167] As Figure 6 shown, the first end of the oil groove 146 communicates with the second end of the oil passage 137. The second end of the oil groove 146 opens at the end surface on the side of the driven scroll wall 118b in the bushing 133. The oil groove 146 connects the second end of the oil passage 137 to the space 147 between the end surface on the side of the driven scroll wall 118b in the bushing 133 and the driven base plate 118a.

[0168] As Figure 8 shown, the outer peripheral surface of the eccentric shaft 132 closes the second end of the oil passage 137. The outer peripheral surface of the eccentric shaft 132 blocks the oil flowing in the oil passage 137 and guides the oil to the oil groove 146.

[0169] [Function of the Second Embodiment]

[0170] Next, the function of the second embodiment will be described.

[0171] The oil existing around the bushing 133 flows into the oil passage 137 from the inflow port 139 and is supplied to the oil sump 146. The oil existing around the bushing 133 follows the rotation of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and flows in the rotation direction of the driven scroll 118. At this time, the guiding surface 145 bends from the through-hole 134 toward the direction opposite to the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and extends toward the inflow port 139. Therefore, the oil existing around the bushing 133 and flowing in the rotation direction of the driven scroll 118 is easily guided by the guiding surface 145 toward the through-hole 134 via the inflow port 139. Therefore, the oil from the inflow port 139 is easily supplied to the oil sump 146 via the oil passage 137. In addition, the oil flowing through the oil passage 137 from the inflow port 139 is blocked by the outer peripheral surface of the eccentric shaft 132 and is guided to the oil sump 146. Therefore, the oil from the inflow port 139 is easily supplied to the oil sump 146 via the oil passage 137.

[0172] The inflow port 139 opens in a portion of the outer peripheral surface of the bushing 133 that is above the vertical direction Z1. Therefore, the oil existing around the bushing 133 easily falls by its own weight and flows into the inflow port 139. Therefore, the oil existing around the bushing 133 easily flows into the oil passage 137 from the inflow port 139 and is supplied to the oil sump 146.

[0173] The oil supplied to the oil sump 146 flows out through the oil sump 146 into the space 147 between the end face on the side of the driven scroll wall 118b and the driven substrate 118a in the bushing 133. And the oil flowing out into the space 147 is supplied to the bearing 135. Thereby, the lubrication of the bearing 135 becomes good.

[0174] [Effect of the Second Embodiment]

[0175] In the second embodiment, in addition to the same effects as the effects (1-4) and (1-5) of the first embodiment, the following effects can also be obtained.

[0176] (2-1) The bushing 133 has an oil passage 137 on the opposing surface 133a that faces the front end surface 105a of the support shaft 105. The oil passage 137 has an inlet 139 that extends from the through-hole 134 toward the outer peripheral surface of the bushing 133 and opens on the outer peripheral surface of the bushing 133. An oil groove 146 is formed on the inner peripheral surface of the through-hole 134, except for the portion where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through-hole 134 and the outer peripheral surface of the eccentric shaft 132. The oil groove 146 communicates with the oil passage 137 and opens at the end surface on the side of the driven scroll wall 118b in the bushing 133. Thus, the oil present around the bushing 133 flows into the oil passage 137 from the inlet 139 and is supplied to the oil groove 146. The oil supplied to the oil groove 146 passes through the oil groove 146 and flows out into the space 147 between the end surface on the side of the driven scroll wall 118b of the bushing 133 and the driven base plate 118a. And the oil that flows out into the space 147 is supplied to the bearing 135. Thus, the lubrication of the bearing 135 becomes good, and therefore the durability of the scroll compressor 100 is improved.

[0177] The oil groove 146 is formed on the inner peripheral surface of the through-hole 134. Therefore, as in the prior art, in order to supply oil to the bearing 135, a through-hole different from the through-hole 134 into which the eccentric shaft 132 is inserted is formed in the bushing 133. Therefore, it is not necessary to ensure the wall thickness of the bushing 133. As a result, the bushing 133 can be prevented from becoming large-sized. Therefore, miniaturization of the scroll compressor 100 can be achieved. In addition, the oil groove 146 is formed on the inner peripheral surface of the through-hole 134, except for the portion where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through-hole 134 and the outer peripheral surface of the eccentric shaft 132. Therefore, even if the oil groove 146 is formed on the inner peripheral surface of the through-hole 134, the swing around the eccentric shaft 132 in the bushing 133 is not hindered by the oil groove 146. Thus, in the scroll compressor 100, miniaturization can be achieved and the durability can be improved.

[0178] (2-2) Thus, in the scroll compressor 100 including the drive scroll 117 and the driven scroll 118, miniaturization can be achieved and the durability can be improved.

[0179] (2-3) The inlet 139 opens at a portion of the outer peripheral surface of the bushing 133 that is above the vertical direction Z1. Thus, the oil present around the bushing 133 easily falls by its own weight and flows into the inlet 139. Therefore, the oil present around the bushing 133 easily flows into the oil passage 137 from the inlet 139 and is supplied to the oil groove 146. Therefore, the lubrication of the bearing 135 is better, and thus the durability of the scroll compressor 100 can be further improved.

[0180] (2-4) The oil passage 137 has a guiding surface 145 that bends from the through-hole 134 in a direction opposite to the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and extends toward the inlet 139. The guiding surface 145 guides the oil flowing in the oil passage 137 toward the through-hole 134. The oil existing around the bushing 133 follows the rotation of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and flows in the rotation direction of the driven scroll 118. At this time, the guiding surface 145 bends from the through-hole 134 in a direction opposite to the rotation direction of the driven scroll 118 when the driving scroll 117 rotates in the positive direction and extends toward the inlet 139. Therefore, the oil existing around the bushing 133 and flowing in the rotation direction of the driven scroll 118 is easily guided by the guiding surface 145 toward the through-hole 134 via the inlet 139. Therefore, the oil from the inlet 139 is easily supplied to the oil sump 146 via the oil passage 137. As a result, since the oil is efficiently supplied to the bearing 135, the lubrication of the bearing 135 is better. Therefore, the durability of the scroll compressor 100 can be further improved.

[0181] [Modification Example]

[0182] It should be noted that the above-described embodiments can be modified as follows. The above-described embodiments and the following modification examples can be implemented in combination with each other within a technically non-contradictory range.

[0183] In the first embodiment, the compression load F1 may also act on the eccentric shaft 50 from a portion of the bushing sleeve portion 52 that is closer to the center L2 of the bushing sleeve portion 52 than the center L3 of the through-hole 54. In this case, the oil sump 70 is formed in a portion of the inner peripheral surface of the through-hole 54 that is closer to the center L3 of the through-hole 54 than the center L2 of the bushing sleeve portion 52. In short, the oil sump 70 may be formed on the inner peripheral surface of the through-hole 54 and in a portion other than the portion where the compression load F1 acts.

[0184] In the second embodiment, the compression load F1 may also act on the eccentric shaft 132 from a portion of the bushing 133 that is closer to the center L12 of the bushing 133 than the center L13 of the through-hole 134. In this case, the oil sump 146 is formed in a portion of the inner peripheral surface of the through-hole 134 that is closer to the center L13 of the through-hole 134 than the center L12 of the bushing 133. In short, the oil sump 146 may be formed on the inner peripheral surface of the through-hole 134 and in a portion other than the portion where the compression load F1 acts.

[0185] In the second embodiment, the inlet 139 may also open in a portion of the outer peripheral surface of the bushing 133 that is located below the vertical direction Z1.

[0186] AsFigure 9 As shown, in the first embodiment, the oil groove 70 may also be formed on the outer peripheral surface of the eccentric shaft 50. In this case, the oil groove 70 is formed on the outer peripheral surface of the eccentric shaft 50 and on a portion other than the portion where the compressive load F1 transmitted from the orbiting scroll 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50. In Figure 9 the embodiment shown, the oil groove 70 is not formed on the inner peripheral surface of the through hole 54. In addition, when the oil groove 70 is formed on the outer peripheral surface of the eccentric shaft 50, even if the bushing 51 swings around the eccentric shaft 50 with respect to the outer peripheral surface of the eccentric shaft 50, the oil groove 70 needs to be formed at a position where the oil groove 70 and the oil passage 60 can always communicate. It is relatively easy to form the oil groove 70 on the outer peripheral surface of the eccentric shaft 50. In this way, the structure in which the oil groove 70 is formed on the outer peripheral surface of the eccentric shaft 50 can facilitate the design of the scroll compressor 10.

[0187] As Figure 10 shown, in the second embodiment, the oil groove 146 may also be formed on the outer peripheral surface of the eccentric shaft 132. In this case, the oil groove 146 is formed on the outer peripheral surface of the eccentric shaft 132 and on a portion other than the portion where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through hole 134 and the outer peripheral surface of the eccentric shaft 132. In Figure 10 the embodiment shown, the oil groove 146 is not formed on the inner peripheral surface of the through hole 134. In addition, when the oil groove 146 is formed on the outer peripheral surface of the eccentric shaft 132, even if the bushing 133 swings around the eccentric shaft 132 with respect to the outer peripheral surface of the eccentric shaft 132, the oil groove 146 needs to be formed at a position where the oil groove 146 and the oil passage 137 can always communicate. It is relatively easy to form the oil groove 146 on the outer peripheral surface of the eccentric shaft 132. In this way, the structure in which the oil groove 146 is formed on the outer peripheral surface of the eccentric shaft 132 can facilitate the design of the scroll compressor 100.

[0188] In the first embodiment, the oil groove 70 may also be formed on both the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50. In short, as long as the oil groove 70 is formed on at least one of the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50 and on a portion other than the portion where the compressive load F1 transmitted from the orbiting scroll 26 acts between the inner peripheral surface of the through hole 54 and the outer peripheral surface of the eccentric shaft 50.

[0189] In the second embodiment, the oil groove 146 may also be formed on both the inner peripheral surface of the through hole 134 and the outer peripheral surface of the eccentric shaft 132. In short, as long as the oil groove 146 is formed on at least one of the inner peripheral surface of the through hole 134 and the outer peripheral surface of the eccentric shaft 132 and on a portion other than the portion where the compressive load F1 transmitted from the driven scroll 118 acts between the inner peripheral surface of the through hole 134 and the outer peripheral surface of the eccentric shaft 132.

[0190] In the first embodiment, the first side surface 64 and the second side surface 65 of the passage forming recess 62 may also extend straight from the outer peripheral surface of the eccentric shaft 50 toward the outer peripheral surface of the bushing flange portion 53. In short, the oil passage 60 may not have the guide surface 66.

[0191] In the second embodiment, the first side surface 143 and the second side surface 144 of the passage forming recess 141 may also extend straight from the outer peripheral surface of the eccentric shaft 132 toward the outer peripheral surface of the bushing 133. In short, the oil passage 137 may not have the guide surface 145.

[0192] In the first embodiment, the second end of the oil passage 60 may also open on the outer peripheral surface of the bushing 51. In short, the outer peripheral surface of the eccentric shaft 50 may not close the second end of the oil passage 60.

[0193] In the second embodiment, the second end of the oil passage 137 may also open on the outer peripheral surface of the bushing 133. In short, the outer peripheral surface of the eccentric shaft 132 may not close the second end of the oil passage 137.

[0194] In the first embodiment, the eccentric shaft 50 may not be integrally formed with the rotary shaft 15, but may be separated from the rotary shaft 15. In this case, the eccentric shaft 50 is mounted on the front end surface 15e of the rotary shaft 15.

[0195] In the second embodiment, the eccentric shaft 132 may be integrally formed with the support shaft 105.

[0196] In the first embodiment, the balance weight 55 may also be separated from the bushing 51.

[0197] In each of the above embodiments, the scroll compressors 10, 100 may not be of the type driven by the motors 22, 110, and may be, for example, of the type driven by the engine of a vehicle.

[0198] In each of the above embodiments, the scroll compressors 10, 100 are used for a vehicle air conditioner, but are not limited thereto. In short, as long as the scroll compressors 10, 100 compress the refrigerant, the uses of the scroll compressors 10, 100 can be appropriately changed.

[0199] In each of the above embodiments, the compression target of the scroll compressors 10, 100 is not limited to the refrigerant, and may be, for example, a fluid such as air.

[0200] Each of the above embodiments includes the structures described in the following appended notes.

[0201] <Supplementary Note 1>

[0202] A scroll compressor, comprising:

[0203] Housing;

[0204] Support shaft, which is supported by the housing support;

[0205] First scroll disk, which has a first base plate and a first scroll wall standing up from the first base plate;

[0206] Second scroll disk, which has a second base plate opposed to the first base plate and a second scroll wall standing up from the second base plate toward the first base plate and engaging with the first scroll wall;

[0207] Eccentric shaft, which protrudes from the front end face of the support shaft and extends parallel to the support shaft at a position eccentric with respect to the axis of the support shaft;

[0208] Bushing, which has a through hole for inserting the eccentric shaft and can swing around the eccentric shaft;

[0209] Cylindrical holding part, which is provided on the end face of the second base plate on the side opposite to the first base plate and has the bushing disposed inside; and

[0210] Bearing, which is disposed between the inner peripheral surface of the holding part and the outer peripheral surface of the bushing,

[0211] The bushing is held by the holding part via the bearing,

[0212] It is characterized in that

[0213] The bushing has an oil passage on the opposed surface opposed to the front end face of the support shaft,

[0214] The oil passage extends from the through hole toward the outer peripheral surface of the bushing and has an inlet opening on the outer peripheral surface of the bushing,

[0215] An oil groove communicating with the oil passage and opening on the end face of the bushing on the side of the second scroll wall is formed in at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft and in a part other than the part where a compressive load transmitted from the second scroll disk acts between the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft.

[0216] <Supplementary Note 2>

[0217] The scroll compressor according to <Supplementary Note 1>, characterized in that

[0218] The support shaft is a rotating shaft rotatably supported by the housing,

[0219] The first scroll disk is a fixed scroll disk having a fixed base plate as the first base plate and a fixed scroll wall as the first scroll wall standing up from the fixed base plate,

[0220] The second scroll disk is a revolving scroll disk that has a revolving substrate as the second substrate facing the fixed substrate, and a revolving scroll wall as the second scroll wall that stands up from the revolving substrate toward the fixed substrate and engages with the fixed scroll wall, and revolves by the rotation of the rotating shaft.

[0221] <Supplementary Note 3>

[0222] The scroll compressor according to <Supplementary Note 2>, characterized in that

[0223] The oil passage has a guiding surface that bends from the through hole toward the rotation direction of the bushing when the rotating shaft rotates in the positive direction and extends toward the inlet.

[0224] The guiding surface guides the oil flowing in the oil passage toward the through hole.

[0225] <Supplementary Note 4>

[0226] The scroll compressor according to <Supplementary Note 1>, characterized in that

[0227] The first scroll disk is a driving scroll disk that has a driving substrate as the first substrate, and a driving scroll wall as the first scroll wall that stands up from the driving substrate and rotates about the axis of the support shaft.

[0228] The second scroll disk is a driven scroll disk that has a driven substrate as the second substrate facing the driving substrate, and a driven scroll wall as the second scroll wall that stands up from the driven substrate toward the driving substrate and engages with the driving scroll wall, and rotates following the rotation of the driving scroll disk.

[0229] <Supplementary Note 5>

[0230] The scroll compressor according to <Supplementary Note 4>, characterized in that

[0231] The inlet opens at a portion of the outer peripheral surface of the bushing located above the vertical direction.

[0232] <Supplementary Note 6>

[0233] The scroll compressor according to <Supplementary Note 4> or <Supplementary Note 5>, characterized in that

[0234] The oil passage has a guiding surface that bends from the through hole toward a direction opposite to the rotation direction of the driven scroll disk when the driving scroll disk rotates in the positive direction and extends toward the inlet.

[0235] The guide surface guides the oil flowing in the oil passage toward the through hole.

[0236] <Supplementary Note 7>

[0237] The scroll compressor according to any one of <Supplementary Note 1> to <Supplementary Note 6>, characterized in that

[0238] The outer peripheral surface of the eccentric shaft blocks the oil flowing in the oil passage and guides the oil to the oil sump.

[0239] <Supplementary Note 8>

[0240] The scroll compressor according to any one of <Supplementary Note 1> to <Supplementary Note 7>, characterized in that

[0241] The oil sump is formed on the inner peripheral surface of the through hole.

[0242] <Supplementary Note 9>

[0243] The scroll compressor according to any one of <Supplementary Note 1> to <Supplementary Note 7>, characterized in that

[0244] The oil sump is formed on the outer peripheral surface of the eccentric shaft.

[0245] Explanation of reference numerals:

[0246] 10, 100... Scroll compressor; 11, 101... Housing; 15... Rotating shaft (support shaft); 15e... Front end face; 25... Fixed scroll plate (first scroll plate); 25a... Fixed substrate (first substrate); 25b... Fixed scroll wall (first scroll wall); 26... Orbiting scroll plate (second scroll plate); 26a... Orbiting substrate (second substrate); 26b... Orbiting scroll wall (second scroll wall); 26e... End face; 28... Boss portion (holding portion); 50, 132... Eccentric shaft; 51, 133... Bushing; 51a, 133a... Opposing surface; 54, 134... Through hole; 56, 135... Bearing; 60, 137... Oil passage; 61, 139... Inlet; 66, 145... Guide surface; 70, 146... Oil sump; 105... Support shaft; 105a... Front end face; 117... Driving scroll plate (first scroll plate); 117a... Driving substrate (first substrate); 117b... Driving scroll wall (first scroll wall); 118... Driven scroll plate (second scroll plate); 118a... Driven substrate (second substrate); 118b... Driven scroll wall (second scroll wall); 130... Holding portion.

Claims

1. A scroll compressor, comprising: A housing; A support shaft supported by the housing; A first scroll plate having a first base plate and a first scroll wall rising from the first base plate; A second scroll plate having a second base plate opposed to the first base plate and a second scroll wall rising from the second base plate toward the first base plate and engaging with the first scroll wall; An eccentric shaft protruding from the front end face of the support shaft and extending parallel to the support shaft at a position eccentric with respect to the axis of the support shaft; A bushing having a through hole into which the eccentric shaft is inserted and capable of swinging about the eccentric shaft; A cylindrical holding portion provided on the end face of the second base plate on the side opposite to the first base plate and having the bushing disposed inside; and A bearing disposed between the inner peripheral surface of the holding portion and the outer peripheral surface of the bushing, The bushing is held by the holding portion via the bearing, Characterized in that, The bushing has an oil passage on the opposing surface opposing the front end face of the support shaft, The oil passage extends from the through hole toward the outer peripheral surface of the bushing and has an inlet opening on the outer peripheral surface of the bushing, On at least one of the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft and except for the portion where a compressive load transmitted from the second scroll plate acts between the inner peripheral surface of the through hole and the outer peripheral surface of the eccentric shaft, an oil groove communicating with the oil passage and opening on the end face on the second scroll wall side of the bushing is formed.

2. The scroll compressor according to claim 1, characterized in that, The support shaft is a rotating shaft rotatably supported by the housing, The first scroll plate is a fixed scroll plate having a fixed base plate as the first base plate and a fixed scroll wall as the first scroll wall rising from the fixed base plate, The second scroll plate is a revolving scroll plate having a revolving base plate as the second base plate opposed to the fixed base plate and a revolving scroll wall as the second scroll wall rising from the revolving base plate toward the fixed base plate and engaging with the fixed scroll wall, and revolving around the fixed scroll plate by the rotation of the rotating shaft.

3. The scroll compressor according to claim 2, characterized in that, The oil passage has a guiding surface that bends from the through hole toward the rotation direction of the bushing when the rotating shaft rotates in the positive direction and extends toward the inlet, The guiding surface guides the oil flowing in the oil passage toward the through hole.

4. The scroll compressor according to claim 1, characterized in that, The first scroll plate is a driving scroll plate having a driving base plate as the first base plate and a driving scroll wall as the first scroll wall rising from the driving base plate, and rotating around the axis of the support shaft, The second scroll plate is a driven scroll plate having a driven base plate as the second base plate opposed to the driving base plate and a driven scroll wall as the second scroll wall rising from the driven base plate toward the driving base plate and engaging with the driving scroll wall, and rotating following the rotation of the driving scroll plate.

5. The scroll compressor according to claim 4, wherein the inlet port is opened in a portion of the outer peripheral surface of the bushing located above the vertical direction.

6. The scroll compressor according to claim 4 or 5, wherein the oil passage has a guiding surface that bends from the through hole in a direction opposite to the rotation direction of the driven scroll when the driving scroll rotates in the positive direction and extends toward the inlet port, the guiding surface guides the oil flowing in the oil passage toward the through hole.

7. The scroll compressor according to any one of claims 1 to 6, wherein the outer peripheral surface of the eccentric shaft blocks the oil flowing in the oil passage and guides the oil to the oil groove.

8. The scroll compressor according to claim 1, wherein the oil groove is formed on the inner peripheral surface of the through hole.

9. The scroll compressor according to claim 1, wherein the oil groove is formed on the outer peripheral surface of the eccentric shaft.

Images