Scroll type compressor

Abstract

To improve durability of a scroll type compressor with the number of members reduced.SOLUTION: Even if a bush 51 tries to move in an axial direction of a rotary shaft 15 toward a revolving scroll 26 between the rotary shaft 15 and the revolving scroll 26, an engagement part 72 engages with the bush 51. Thus, movement of the bush 51 in the axial direction of the rotary shaft 15 toward the revolving scroll 26 is restricted. Accordingly, the structure prevents the bush 51 from contacting with the revolving scroll 26 and thus a problem that the bush 51 contacts with the revolving scroll 26 to cause abrasion between the revolving scroll 26 and the bush 51 can be avoided. The engagement part 72 is integrally molded with an eccentric shaft 50, penetrates through a through hole 57, and engages with the bush 51 swingably. Therefore, there is no need to provide a separate member for restricting the movement of the bush 51 in the axial direction of the rotary shaft 15 toward the revolving scroll 26.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] For example, as disclosed in Patent Document 1, a scroll compressor includes a housing, a rotating shaft, a fixed scroll, and an orbiting scroll. The rotating shaft is rotatably supported relative to the housing. The fixed scroll is fixed to the housing. The orbiting scroll forms a compression chamber together with the fixed scroll by rotation of the rotating shaft. The rotating shaft is provided with an eccentric shaft. The eccentric shaft extends parallel to the rotating shaft at a position eccentric to the axis of the rotating shaft. A bushing is inserted into the eccentric shaft, which is swingable about the eccentric shaft between the rotating shaft and the orbiting scroll. In such a scroll compressor, the orbital radius of the orbiting scroll is variable by swinging the bushing about the eccentric shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-160313 Summary of the Invention [Problem to be solved by the invention]

[0004] In such a scroll compressor, the bushing may move between the rotary shaft and the orbiting scroll in the axial direction of the rotary shaft toward the orbiting scroll. If the bushing moves between the rotary shaft and the orbiting scroll in the axial direction of the rotary shaft toward the orbiting scroll, there is a risk that the bushing may come into contact with the orbiting scroll. If the bushing comes into contact with the orbiting scroll, wear occurs between the orbiting scroll and the bushing, thereby reducing the durability of the scroll compressor.

[0005] Therefore, for example, it is conceivable to provide a separate member for restricting the axial movement of the rotation shaft of the bushing toward the orbiting scroll, but this is not preferable because it increases the number of parts. Therefore, it is desired to improve the durability of the scroll compressor while reducing the number of parts. [Means for solving the problem]

[0006] A scroll compressor that solves the above problem comprises a housing, a rotating shaft rotatably supported relative to the housing, a fixed scroll fixed to the housing, and a revolving scroll that forms a compression chamber together with the fixed scroll by rotation of the rotating shaft, wherein the rotating shaft is provided with an eccentric shaft that extends parallel to the rotating shaft at a position eccentric to the axis of the rotating shaft, and a bottomed cylindrical bushing that can swing around the eccentric shaft between the rotating shaft and the revolving scroll is inserted into the eccentric shaft, and a through hole is provided in the bottom wall of the bushing, and a locking portion that passes through the through hole and locks the bushing so that it can swing is integrally molded into the eccentric shaft.

[0007] With this, even if the bushing attempts to move in the axial direction of the rotating shaft toward the orbiting scroll between the rotating shaft and the orbiting scroll, the locking portion locks onto the bushing. Therefore, the axial movement of the rotating shaft toward the orbiting scroll in the bushing can be restricted. Therefore, the bushing can be prevented from coming into contact with the orbiting scroll, thereby avoiding problems such as the bushing coming into contact with the orbiting scroll and causing wear between the orbiting scroll and the bushing. The locking portion is integrally molded with the eccentric shaft and passes through the through hole to lock the bushing so that it can swing. Therefore, there is no need to provide a separate member to restrict the axial movement of the rotating shaft toward the orbiting scroll in the bushing. As a result, the durability of the scroll compressor can be improved while reducing the number of parts.

[0008] In the scroll compressor, the eccentric shaft may have a main body portion accommodated inside the bushing, and the locking portion may have a locking end portion provided on the opposite side of the main body portion with the bottom wall of the bushing in between. The locking portion having a locking end portion provided on the opposite side of the main body portion with the bottom wall of the bushing in between is suitable as a configuration in which the locking portion passes through a through hole and swingably locks the bushing.

[0009] In the above scroll compressor, the bushing is provided with a swing regulating portion that contacts the rotating shaft to regulate swing beyond a specified range, and the engaging end portion is preferably capable of contacting the bottom wall of the bushing in the axial direction of the rotating shaft within a specified range of swing of the bushing defined by the swing regulating portion.

[0010] According to this, the locking end portion contacts the bottom wall of the bushing in the axial direction of the rotating shaft, thereby restricting axial movement of the rotating shaft in the bushing toward the orbiting scroll. The locking end portion can contact the bottom wall of the bushing in the axial direction of the rotating shaft within a specified range of swing of the bushing defined by the swing restricting portion. This configuration is suitable as a configuration of a locking portion that passes through a through hole and locks the bushing so that it can swing.

[0011] In the scroll compressor, the bottom wall of the bush may be provided with a recess that communicates with the through hole and into which the engaging end portion can be fitted. This allows the engaging end to be positioned closer to the rotary shaft by an amount corresponding to the engagement of the recess with the engaging end, thereby enabling the scroll compressor to be made smaller in size in the axial direction of the rotary shaft.

[0012] In the above scroll compressor, the recess is provided with a swing regulating portion that comes into contact with the engaging end portion to regulate swing beyond a specified range, and the engaging end portion is preferably capable of coming into contact with the bottom wall of the bush in the axial direction of the rotating shaft within a specified range of swing of the bush defined by the swing regulating portion.

[0013] According to this, the engagement end portion contacts the bottom wall of the bushing in the axial direction of the rotating shaft, thereby restricting axial movement of the rotating shaft in the bushing toward the orbiting scroll. The recess is provided with a swing restricting portion that restricts swing beyond a specified range by contacting the engagement end portion. Therefore, the recess can be used to provide a swing restricting portion. The engagement end portion can contact the bottom wall of the bushing in the axial direction of the rotating shaft within the specified range of swing of the bushing defined by the swing restricting portion. This configuration is suitable as a configuration of an engagement portion that passes through a through hole and engages the bushing so that it can swing.

[0014] In the scroll compressor, the depth of the recess in the axial direction of the rotary shaft may be greater than a gap between the rotary shaft and the bushing. This prevents the engaging end from falling off the recess even if the bushing moves in the axial direction of the rotary shaft toward the rotary shaft between the rotary shaft and the orbiting scroll.

[0015] In the scroll compressor, the through hole may have a pair of inner hole surfaces extending parallel to each other, the locking end may have a pair of side surfaces extending parallel to each other, and the inner hole surfaces and the side surfaces may intersect with each other when viewed in the axial direction of the eccentric shaft. Such a configuration is preferable for the through hole and the locking end. [Effects of the Invention]

[0016] According to the present invention, it is possible to improve the durability of the scroll compressor while reducing the number of components. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view of a scroll compressor according to an embodiment. [Figure 2] FIG. 2 is an enlarged cross-sectional view of a portion of the scroll compressor. [Figure 3] FIG. 3 is a cross-sectional view of the bushing. [Figure 4] FIG. 4 is a front view of the bushing. [Figure 5] FIG. 5 is a front view of the bushing. [Figure 6] FIG. 6 is a perspective view for explaining the locking portion. [Figure 7] FIG. 7 is a side view illustrating the locking portion. [Figure 8] FIG. 8 is an exploded cross-sectional view showing the bushing and the eccentric shaft. [Figure 9] FIG. 9 is a cross-sectional view showing the bushing and the eccentric shaft. [Figure 10] FIG. 10 is a front view showing the relationship between the bush and the eccentric shaft. [Figure 11] FIG. 11 is a front view showing the relationship between the bush and the eccentric shaft. [Figure 12] FIG. 12 is a front view showing the relationship between the bushing and the eccentric shaft in the modified example. [Figure 13] FIG. 13 is an enlarged cross-sectional view showing a part of a scroll compressor according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a scroll compressor will be described below with reference to Figures 1 to 11. The scroll compressor of this embodiment is used in, for example, a vehicle air conditioner. <Outline of scroll compressor> As shown in FIG. 1 , the scroll compressor 10 includes a cylindrical housing 11. The housing 11 has a motor housing 12, a support housing 13, and a discharge housing 14. The motor housing 12, the support housing 13, and the discharge housing 14 are made of a metal material. The motor housing 12, the support housing 13, and the discharge housing 14 are made of aluminum, for example. The scroll compressor 10 also includes a rotating shaft 15. The rotating shaft 15 is accommodated in the housing 11.

[0019] 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 periphery of the end wall 12a. The axial direction of the peripheral wall 12b coincides with the axial direction of the rotary shaft 15. The motor housing 12 has a plurality of female threaded holes 12c. Each female threaded hole 12c is formed at an open end of the peripheral wall 12b. Note that for convenience of explanation, only one female threaded hole 12c is shown in FIG. 1. The motor housing 12 also has an intake port 12h. The intake port 12h draws in a refrigerant. The intake port 12h is formed in a portion of the peripheral wall 12b that is located on the end wall 12a side. The intake port 12h connects the inside and outside of the motor housing 12.

[0020] The motor housing 12 has a cylindrical bearing holder 12d. The bearing holder 12d protrudes from the center of the inner surface of the end wall 12a. A first end, which is one axial end of the rotating shaft 15, is inserted into the bearing holder 12d. The scroll compressor 10 is provided with a bearing 16. The bearing 16 is, for example, a rolling bearing. The bearing 16 is provided between the inner circumferential surface of the bearing holder 12d and the outer circumferential surface of the first end of the rotating shaft 15. The first end of the rotating shaft 15 is rotatably supported by the motor housing 12 via the bearing 16.

[0021] The journal housing 13 has a plate-shaped end wall 17 and a cylindrical peripheral wall 18. The peripheral wall 18 extends cylindrically from the outer periphery of the end wall 17. The axial direction of the peripheral wall 18 coincides with the axial direction of the rotary shaft 15. The journal housing 13 also has an annular flange wall 19. The flange wall 19 extends radially outward from the rotary shaft 15 from an end of the outer periphery of the peripheral wall 18 opposite the end wall 17.

[0022] The support housing 13 has a circular insertion hole 17a. The insertion hole 17a is formed in the center of the end wall 17. The insertion hole 17a penetrates the end wall 17 in the thickness direction. The rotary shaft 15 is inserted through the insertion hole 17a.

[0023] As shown in Fig. 2, a tip end surface 15e located on the second end side, which is the other end in the axial direction of the rotating shaft 15, is located inside the peripheral wall 18. A press-fit hole 15h is formed in the tip end surface 15e of the rotating shaft 15. The press-fit hole 15h is a circular hole. The press-fit hole 15h is formed in the tip end surface 15e so that the axis of the press-fit hole 15h extends parallel to the axis of the rotating shaft 15 at a position eccentric to the axis of the rotating shaft 15.

[0024] 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 circumferential surface of the peripheral wall 18 and the outer circumferential surface of the rotating shaft 15. The rotating shaft 15 is rotatably supported by the support housing 13 via the bearing 21. Therefore, the support housing 13 rotatably supports the rotating shaft 15. In this manner, the rotating shaft 15 is rotatably supported with respect to the housing 11.

[0025] As shown in Figure 1, the journal support housing 13 has a plurality of bolt insertion holes 19a. Each bolt insertion hole 19a is formed on the outer periphery of the flange wall 19. Each bolt insertion hole 19a penetrates the flange wall 19 in the thickness direction. Each bolt insertion hole 19a in the flange wall 19 communicates with each of the female threaded holes 12c in the motor housing 12. For ease of explanation, only one bolt insertion hole 19a is shown in Figure 1.

[0026] The scroll compressor 10 has a motor chamber 20. The motor chamber 20 is defined by a motor housing 12 and a support housing 13. The motor housing 12 defines the motor chamber 20 together with the support housing 13. In this manner, the motor chamber 20 is formed within the housing 11. The motor chamber 20 communicates with an intake port 12h. Refrigerant is drawn into the motor chamber 20 from the intake port 12h.

[0027] The scroll compressor 10 includes a motor 22. The motor 22 is housed in 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 rotary shaft 15. The stator 23 surrounds the rotor 24. The rotor 24 includes a rotor core 24a fixed to the rotary shaft 15 and a plurality of permanent magnets (not shown) provided on the rotor core 24a. The rotor 24 also includes a motor rotor balancer 24b.

[0028] The stator 23 has a cylindrical stator core 23a and a motor coil 23b. The stator core 23a is fixed to the inner circumferential surface of the peripheral wall 12b of the motor housing 12. The motor coil 23b is wound around the stator core 23a. Electric power controlled by an inverter (not shown) is supplied to the motor coil 23b, causing the rotor 24 to rotate. This causes the rotating shaft 15 to rotate integrally with the rotor 24. Therefore, the motor 22 rotates the rotating shaft 15.

[0029] The rotating shaft 15 has a main balancer 15a. The main balancer 15a protrudes from a portion of the outer peripheral surface of the rotating shaft 15 between the rotor core 24a and the support housing 13. The main balancer 15a is disposed in the motor chamber 20, between the motor 22 and the support housing 13.

[0030] The scroll compressor 10 includes a compression mechanism C1. The compression mechanism C1 has a fixed scroll 25 and an orbiting scroll 26. Therefore, the scroll compressor 10 includes the fixed scroll 25 and the orbiting scroll 26. The compression mechanism C1 is of a scroll type. The orbiting scroll 26 revolves around the fixed scroll 25 as the rotary shaft 15 rotates.

[0031] The fixed scroll 25 has a fixed base plate 25a and a fixed spiral wall 25b. The fixed base plate 25a is disk-shaped. A discharge port 25h is formed in the center of the fixed base plate 25a. The discharge port 25h is a circular hole. The discharge port 25h penetrates the fixed base plate 25a in the thickness direction. The fixed spiral wall 25b stands upright from the fixed base plate 25a. The fixed scroll 25 also has an outer circumferential wall 25c. The outer circumferential wall 25c stands upright from the outer periphery of the fixed base plate 25a. The outer circumferential wall 25c surrounds the fixed spiral wall 25b.

[0032] The scroll compressor 10 includes a valve mechanism 25v. The valve mechanism 25v is attached to the surface of the fixed base plate 25a opposite to the fixed spiral wall 25b. The valve mechanism 25v is configured to be able to open and close a discharge port 25h.

[0033] The orbiting scroll 26 has an orbiting base plate 26a and an orbiting spiral wall 26b. The orbiting base plate 26a is disk-shaped. The orbiting base plate 26a faces the fixed base plate 25a. The orbiting spiral wall 26b stands up from the orbiting base plate 26a toward the fixed base plate 25a. The orbiting spiral wall 26b meshes with the fixed spiral wall 25b. The orbiting scroll 26 is located inside the outer peripheral wall 25c. The orbiting scroll 26 revolves inside the outer peripheral wall 25c. The tip surface of the fixed spiral wall 25b contacts the orbiting base plate 26a. The tip surface of the orbiting spiral wall 26b contacts the fixed base plate 25a.

[0034] The scroll compressor 10 includes a compression chamber 27. The compression chamber 27 is defined by a fixed base plate 25a, a fixed spiral wall 25b, an orbiting base plate 26a, and an orbiting spiral wall 26b. Therefore, the compression chamber 27 is defined between the fixed scroll 25 and the orbiting scroll 26. The compression chamber 27 takes in and compresses a refrigerant from the outside.

[0035] The scroll compressor 10 includes a boss portion 28. The boss portion 28 is cylindrical. The boss portion 28 protrudes in a cylindrical shape from the center of an end face 26e of the rotating base plate 26a, which is located on the opposite side from the fixed base plate 25a. The axial direction of the boss portion 28 coincides with the axial direction of the rotating shaft 15.

[0036] The orbiting base plate 26a has a plurality of grooves 26d. The grooves 26d are formed around the boss portions 28 on the end face 26e of the orbiting base plate 26a. The grooves 26d are arranged at predetermined intervals in the circumferential direction of the rotary shaft 15. For ease of explanation, only one groove 26d is shown in FIG. 1. An annular ring member 29 is fitted into each groove 26d. A pin 30 is inserted into each ring member 29. Each pin 30 protrudes from the end face 13e of the support housing 13 on the orbiting scroll 26 side.

[0037] The scroll compressor 10 includes an elastic plate 31. The elastic plate 31 is annular. The elastic plate 31 is sandwiched between the end face 13e of the support housing 13 and the open end face of the outer peripheral wall 25c. The elastic plate 31 constantly biases the orbiting scroll 26 toward the fixed scroll 25.

[0038] 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 periphery of the end wall 14a. The axial direction of the peripheral wall 14b coincides with the axial direction of the rotation shaft 15. The peripheral wall 14b surrounds the fixed scroll 25. Therefore, the fixed scroll 25 is accommodated within the housing 11.

[0039] The discharge housing 14 has a plurality of bolt insertion holes 14c. Each bolt insertion hole 14c is formed in the peripheral wall 14b. For ease of explanation, only one bolt insertion hole 14c is shown in FIG. 1. Each bolt insertion hole 14c communicates with a corresponding bolt insertion hole 19a in the flange wall 19.

[0040] The bolts B1 passing through each bolt insertion hole 14c pass through each bolt insertion hole 19a in the flange wall 19 and are threaded into each female threaded hole 12c of the motor housing 12. As a result, the journal 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 journal housing 13. Therefore, the motor housing 12, journal housing 13, and discharge housing 14 are arranged in this order in the axial direction of the rotating shaft 15. The fixed scroll 25 is sandwiched between the end wall 14a of the discharge housing 14 and the journal housing 13. In this manner, the fixed scroll 25 is fixed to the housing 11.

[0041] The scroll compressor 10 includes 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 portion of the inner circumferential surface of the peripheral wall 12b of the motor housing 12. The first groove 36 opens to an open end of the peripheral wall 12b. The first hole 37 is formed in the outer circumferential portion of the flange wall 19 of the journal 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 portion of the inner circumferential 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 circumferential wall 25c of the fixed scroll 25. The second hole 39 penetrates the outer circumferential 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.

[0042] The refrigerant in the motor chamber 20 passes through the first groove 36, the first hole 37, the second groove 38, and the second hole 39 and is drawn into the compression chamber 27. The refrigerant drawn into the compression chamber 27 is compressed within the compression chamber 27 by the orbital motion of the orbiting scroll 26. In this manner, the compression mechanism C1 compresses the refrigerant drawn into the housing 11. The orbiting scroll 26 forms the compression chamber 27 together with the fixed scroll 25 by the rotation of the rotary shaft 15.

[0043] The scroll compressor 10 includes a discharge chamber 40. The discharge chamber 40 is defined 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. Refrigerant compressed in the compression chamber 27 is discharged into the discharge chamber 40. The scroll compressor 10 also includes an oil reservoir 41. The oil reservoir 41 is formed in the end wall 14a of the discharge housing 14.

[0044] The scroll compressor 10 includes 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 an elongated cylindrical outer cylinder 43 that is part of the end wall 14a of the discharge housing 14. A first end of the outer cylinder 43 forms a discharge port 44 that discharges the refrigerant to the outside. The discharge port 44 is in communication with the oil separation chamber 42.

[0045] An inner cylinder 45 is fitted into the oil separation chamber 42. The axial direction of the inner cylinder 45 coincides with the radial direction of the rotating shaft 15. A first end of the inner cylinder 45 communicates with the discharge port 44. A second end of the inner cylinder 45 communicates with the oil separation chamber 42 on the side opposite the discharge port 44. An introduction hole 46 is formed in the outer cylinder 43. The introduction hole 46 communicates between the discharge chamber 40 and the oil separation chamber 42. The introduction hole 46 introduces the refrigerant discharged into the discharge chamber 40 into the oil separation chamber 42.

[0046] An oil drain hole 47 is formed in the discharge housing 14. A first end of the oil drain hole 47 communicates with the oil separation chamber 42 on the side opposite the discharge port 44. A 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.

[0047] 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. This applies centrifugal force to the oil contained in the refrigerant, causing the oil to be 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.

[0048] The refrigerant from which the oil has been separated flows into and passes through the inner cylinder 45. The refrigerant that has passed through the inner cylinder 45 then flows out to an external refrigerant circuit (not shown) through the discharge port 44. The oil separated from the refrigerant in the oil separation chamber 42 flows toward the oil drain hole 47. The oil flowing toward the oil drain hole 47 is then discharged through the oil drain hole 47 into the oil reservoir chamber 41 and stored in the oil reservoir chamber 41.

[0049] The scroll compressor 10 is provided with an oil return passage 48. The oil return passage 48 passes from the oil reservoir chamber 41 through the discharge housing 14 and the support housing 13 to the inside of the peripheral wall 18 of the support housing 13. Therefore, the oil return passage 48 connects the oil reservoir chamber 41 to the inside of the peripheral wall 18 of the support housing 13. The oil stored in the oil reservoir chamber 41 is returned to the inside of the peripheral wall 18 of the support housing 13 via the oil return passage 48.

[0050] As shown in FIG. 2 , the scroll compressor 10 includes an eccentric shaft 50. The eccentric shaft 50 is press-fitted into the press-fit hole 15h and protrudes from the tip end surface 15e of the rotating shaft 15. The eccentric shaft 50 extends parallel to the rotating shaft 15 at a position eccentric to the axis L1 of the rotating shaft 15. In this manner, the rotating shaft 15 is provided with the eccentric shaft 50 extending parallel to the rotating shaft 15 at a position eccentric to the axis L1 of the rotating shaft 15. The eccentric shaft 50 is a separate member from 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 tip end surface 15e of the rotating shaft 15 toward the orbiting scroll 26. The eccentric shaft 50 is inserted into the boss portion 28.

[0051] <Bush> The scroll compressor 10 includes a bushing 51. The bushing 51 has a bushing cylindrical portion 52 and a bushing flange portion 53. The bushing cylindrical portion 52 has a disk-shaped bottom wall 54 and a cylindrical cylindrical portion 55. Therefore, the bushing 51 has a bottomed cylindrical shape. The cylindrical portion 55 extends from the outer periphery of the bottom wall 54. The bushing cylindrical portion 52 is disposed inside the boss portion 28. Therefore, the bushing 51 is disposed inside the boss portion 28.

[0052] The end of the tubular portion 55 of the bushing tubular portion 52 opposite the bottom wall 54 protrudes from the boss portion 28. The bushing flange portion 53 protrudes outward in an annular shape from the end of the tubular portion 55 of the bushing tubular portion 52 opposite the bottom wall 54. The bushing flange portion 53 overlaps with the end face of the boss portion 28 in the axial direction of the boss portion 28.

[0053] The eccentric shaft 50 is inserted into the bushing cylindrical portion 52. The open end face of the cylindrical portion 55 of the bushing cylindrical portion 52 faces the tip end face 15e of the rotary shaft 15. The bushing 51 is swingable around the eccentric shaft 50. In this manner, the bushing 51, which is a cylindrical member with a bottom and can swing around the eccentric shaft 50 between the rotary shaft 15 and the orbiting scroll 26, is inserted into the eccentric shaft 50.

[0054] The bushing 51 is provided with a sub-balancer 56. The sub-balancer 56 is integrated with the bushing 51. The sub-balancer 56 is formed integrally with the bushing 51. The sub-balancer 56 protrudes outward from a portion of the outer peripheral surface of the bushing flange 53. The sub-balancer 56 is plate-shaped. The sub-balancer 56 is housed within the peripheral wall 18 of the journal support housing 13.

[0055] <Through hole> As shown in Figures 3 and 4, a through hole 57 is provided in the bottom wall 54 of the bushing 51. The through hole 57 has a pair of hole inner surfaces 58 and a pair of connecting inner surfaces 59. The pair of hole inner surfaces 58 extend parallel to each other. The pair of connecting inner surfaces 59 are continuous with the inner circumferential surface of the cylindrical portion 55. The pair of connecting inner surfaces 59 are located on the same plane as the inner circumferential surface of the cylindrical portion 55. Each connecting inner surface 59 connects each hole inner surface 58 to another.

[0056] <Swing restriction part> As shown in FIG. 5 , the bushing 51 has a first protrusion 61 and a second protrusion 62. The first protrusion 61 protrudes from a surface of the bushing flange 53 opposite the cylindrical portion 55. The second protrusion 62 protrudes from a surface of the sub-balancer 56 opposite the cylindrical portion 55. The first protrusion 61 and the second protrusion 62 are disposed radially outward of the rotating shaft 15. The first protrusion 61 and the second protrusion 62 are configured to be able to come into contact with the outer peripheral surface of the rotating shaft 15 when the bushing 51 swings around the eccentric shaft 50. The first protrusion 61 and the second protrusion 62 function as a swing restricting portion 63 that restricts swing of the bushing 51 beyond a specified range by contacting the rotating shaft 15. Therefore, the bushing 51 is provided with a swing restricting portion 63 that restricts swing of the bushing 51 beyond a specified range by contacting the rotating shaft 15.

[0057] <Eccentric shaft> 2, the eccentric shaft 50 has a press-fit portion 70, a main body portion 71, and a locking portion 72. The press-fit portion 70, the main body portion 71, and the locking portion 72 are integrally molded. Therefore, the eccentric shaft 50 has the locking portion 72 integrally molded.

[0058] The press-fit portion 70 has a cylindrical shape. The press-fit portion 70 is press-fitted into the press-fit hole 15h. Therefore, the press-fit portion 70 is the portion of the eccentric shaft 50 that is press-fitted into the press-fit hole 15h. The eccentric shaft 50 is fixed to the rotating shaft 15 by press-fitting the press-fit portion 70 into the press-fit hole 15h.

[0059] The main body portion 71 is continuous with the press-fit portion 70. The main body portion 71 is cylindrical. The outer diameter of the main body portion 71 is the same as the outer diameter of the press-fit portion 70. The main body portion 71 protrudes from the tip surface 15e of the rotating shaft 15. The main body portion 71 is inserted inside the tubular portion 55 of the bushing tubular portion 52. In this way, the main body portion 71 is housed inside the bushing 51.

[0060] As shown in Figures 6 and 7, the locking portion 72 has an extending portion 73 and an engaging end portion 74. The extending portion 73 is columnar and protrudes from the end face of the main body portion 71 opposite the press-fit portion 70. The extending portion 73 has a pair of side surfaces 73a and a pair of connecting outer surfaces 73b. The pair of side surfaces 73a extend parallel to each other. The pair of connecting outer surfaces 73b are arc surfaces that pass through an imaginary circle with a diameter smaller than the outer diameter of the main body portion 71. Each connecting outer surface 73b connects each side surface 73a to another.

[0061] The locking end 74 is continuous with the end of the extension portion 73 opposite the main body portion 71. The locking end 74 has a pair of side surfaces 74a and a pair of connecting outer surfaces 74b. The pair of side surfaces 74a extend parallel to each other. The pair of connecting outer surfaces 74b are arc surfaces that pass through an imaginary circle having the same diameter as the outer diameter of the main body portion 71. Each side surface 74a of the locking end 74 is continuous with each side surface 73a of the extension portion 73. Each side surface 74a of the locking end 74 is located on the same plane as each side surface 73a of the extension portion 73. Each connecting outer surface 74b connects each side surface 74a to each other.

[0062] The locking end portion 74 has a pair of step surfaces 75. Each step surface 75 connects a corresponding connecting outer surface 73b of the extending portion 73 to a corresponding connecting outer surface 74b of the locking end portion 74. Each step surface 75 extends in a direction perpendicular to the axial direction of the eccentric shaft 50. Each step surface 75 is flat.

[0063] 8, 9, and 10, the locking end 74 is configured to be able to pass through the through hole 57 with each side surface 74a extending along each hole inner surface 58 and each connection outer surface 74b extending along each connection inner surface 59 when viewed in the axial direction of the eccentric shaft 50. When the locking end 74 has passed through the through hole 57, the extension portion 73 is disposed inside the through hole 57. The extension portion 73 is configured to be rotatable inside the through hole 57. The locking end 74 is provided on the opposite side to the main body portion 71 with the bottom wall 54 of the bushing 51 sandwiched therebetween.

[0064] 11 , when the eccentric shaft 50 is rotated with the locking end 74 passing through the through hole 57, each step surface 75 of the locking end 74 can come into contact with the periphery of the through hole 57 on the outer surface of the bottom wall 54 of the bushing 51. In this way, the eccentric shaft 50 and the bushing 51 are assembled with the locking portion 72 locking the bushing 51. The locking portion 72 passes through the through hole 57 and locks the bushing 51 so that it can swing. Each hole inner surface 58 and each side surface 74a intersect with each other when viewed in the axial direction of the eccentric shaft 50.

[0065] The eccentric shaft 50 and the rotating shaft 15 are assembled by first assembling the eccentric shaft 50 and the bushing 51, and then press-fitting the press-fit portion 70 of the eccentric shaft 50 into the press-fit hole 15h. Alternatively, the eccentric shaft 50 and the rotating shaft 15 may be assembled as follows. First, the press-fit portion 70 of the eccentric shaft 50 is press-fitted partway into the press-fit hole 15h to such an extent that the swing restricting portion 63 does not come into contact with the rotating shaft 15 even when the bushing 51 swings. Then, from this state, the eccentric shaft 50 and the bushing 51 are assembled, and then the press-fit portion 70 of the eccentric shaft 50 is press-fitted into the press-fit hole 15h to a predetermined position, thereby assembling the eccentric shaft 50 and the rotating shaft 15.

[0066] The locked state between the locking end 74 and the bottom wall 54 of the bushing 51 will not be released unless the bushing 51 swings beyond the specified swing range of the bushing 51 defined by the swing restricting portion 63. Therefore, the locked state between the locking end 74 and the bottom wall 54 of the bushing 51 will not be released during operation of the scroll compressor 10. In this way, within the specified swing range of the bushing 51 defined by the swing restricting portion 63, the locking end 74 can come into contact with the bottom wall 54 of the bushing 51 in the axial direction of the rotating shaft 15.

[0067] <Bearings> As shown in Fig. 2, the scroll compressor 10 includes a bearing 76. The bearing 76 is a cylindrical plain bearing. The bearing 76 is disposed inside the boss portion 28. The bearing 76 is disposed between the inner peripheral surface of the boss portion 28 and the outer peripheral surface of the tubular portion 55 of the bushing tubular portion 52. Therefore, the bearing 76 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 supported by the boss portion 28 via the bearing 76.

[0068] The rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 50, the bushing 51, and the bearing 76. This causes the orbiting scroll 26 to rotate on its axis. Contact between each pin 30 and the inner peripheral surface of each ring member 29 prevents the orbiting scroll 26 from rotating on its axis, allowing only the orbiting scroll 26 to revolve. This causes the orbiting scroll 26 to revolve with the orbiting spiral wall 26b in contact with the fixed spiral wall 25b. As the orbiting scroll 26 revolves, the volume of the compression chamber 27 decreases, compressing the refrigerant in the compression chamber 27. As the rotating shaft 15 rotates, the orbiting scroll 26 revolves inside the outer peripheral wall 25c. The motor rotor balancer 24b, the main balancer 15a, and the sub-balancer 56 counteract the centrifugal force acting on the orbiting scroll 26 as it revolves. This reduces the amount of imbalance of the orbiting scroll 26.

[0069] <Driven crank mechanism> The center L2 of the cylindrical portion 55 of the bushing cylindrical portion 52 is located radially outward of the axis L1 of the rotary shaft 15. The center of the orbiting base plate 26a coincides with the center L2 of the cylindrical portion 55. The distance between the center L2 of the cylindrical portion 55 and the axis L1 of the rotary shaft 15 is the orbital radius of the orbiting scroll 26.

[0070] When the bushing 51 swings around the eccentric shaft 50, the distance between the center L2 of the cylindrical portion 55 and the axis L1 of the rotary shaft 15 changes, thereby varying the orbital radius of the orbiting scroll 26. In this way, the eccentric shaft 50, the bushing 51, and the bearing 76 constitute a so-called driven crank mechanism 77 that varies the orbital radius of the orbiting scroll 26. Such a driven crank mechanism 77 is already known.

[0071] 4, the inner peripheral surface of the cylindrical portion 55 is formed in a state where the center L3 of a circle C10 passing through the inner peripheral surface of the cylindrical portion 55 is located at a position eccentric to the center L2 of the cylindrical portion 55. Therefore, when viewed in the axial direction of the eccentric shaft 50, the through hole 57 is offset closer to the center L3 of the circle C10 passing through the inner peripheral surface of the cylindrical portion 55 than the center L2 of the cylindrical portion 55.

[0072] <Function of the driven crank mechanism> Since minute processing errors and assembly errors occur in the fixed scroll 25 and the orbiting scroll 26, a gap (gap) is provided in advance between the fixed spiral wall 25b and the orbiting spiral wall 26b.

[0073] When the rotating shaft 15 rotates in the forward direction, the bushing 51 swings about the eccentric shaft 50 due to the compressive load acting on the orbiting scroll 26. When the bushing 51 swings about the eccentric shaft 50, the distance between the center L2 of the cylindrical portion 55 and the axis L1 of the rotating shaft 15 increases, and the orbital radius of the orbiting scroll 26 increases. Then, when the orbiting spiral wall 26b comes into contact with the fixed spiral wall 25b, the swing of the bushing 51 about the eccentric shaft 50 is restricted. This fixes the orbital radius of the orbiting scroll 26.

[0074] Furthermore, the rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 50, the bushing 51, and the bearing 76, causing the orbiting scroll 26 to rotate in the forward direction. Then, when the orbiting spiral wall 26b contacts the fixed spiral wall 25b, the pin 30 and the ring member 29 come into contact. This prevents the orbiting scroll 26 from rotating on its own axis, allowing only the orbiting scroll 26 to revolve in the forward direction. The orbiting scroll 26 then revolves in the forward direction while the orbiting spiral wall 26b is in contact with the fixed spiral wall 25b. This prevents refrigerant leakage from the compression chamber 27, reduces the volume of the compression chamber 27, and compresses the refrigerant.

[0075] When assembling the orbiting scroll 26 to the fixed scroll 25, the bushing 51 is swung about the eccentric shaft 50 in the direction opposite to the direction in which the rotary shaft 15 rotates in the forward direction. This reduces the distance between the center L2 of the bushing 51 and the axis L1 of the rotary shaft 15, thereby reducing the orbital radius of the orbiting scroll 26. As a result, the relative position of the orbiting spiral wall 26b with respect to the fixed spiral wall 25b becomes a position where the orbiting spiral wall 26b does not come into contact with the fixed spiral wall 25b. This makes it possible to easily assemble the orbiting scroll 26 to the fixed scroll 25.

[0076] When the bushing 51 swings about the eccentric shaft 50 in the direction opposite to when the rotating shaft 15 is rotating in the forward direction, the swing of the bushing 51 is restricted by the swing restricting portion 63 before the distance between the center L2 of the cylindrical portion 55 and the axis L1 of the rotating shaft 15 increases. When the bushing 51 swings about the eccentric shaft 50 in the direction opposite to when the rotating shaft 15 is rotating in the forward direction, the swing of the bushing 51 is restricted by the swing restricting portion 63 when the distance between the center L2 of the cylindrical portion 55 and the axis L1 of the rotating shaft 15 becomes the shortest.

[0077] [Operation of the embodiment] Next, the operation of the embodiment will be described. In such a scroll compressor 10, the bushing 51 may move in the axial direction of the rotary shaft 15 toward the orbiting scroll 26 between the rotary shaft 15 and the orbiting scroll 26. Even if the bushing 51 attempts to move in the axial direction of the rotary shaft 15 toward the orbiting scroll 26 between the rotary shaft 15 and the orbiting scroll 26, the locking portion 72 locks the bushing 51. More specifically, the locking end portion 74 contacts the bottom wall 54 of the bushing 51 in the axial direction of the rotary shaft 15. This restricts the movement of the bushing 51 in the axial direction of the rotary shaft 15 toward the orbiting scroll 26. This prevents the bushing 51 from coming into contact with the orbiting scroll 26, thereby avoiding a problem such as the bushing 51 coming into contact with the orbiting scroll 26 and causing wear between the orbiting scroll 26 and the bushing 51.

[0078] [Effects of the embodiment] The embodiment can provide the following effects. (1) Even if the bushing 51 attempts to move in the axial direction of the rotating shaft 15 toward the orbiting scroll 26 between the rotating shaft 15 and the orbiting scroll 26, the locking portion 72 locks the bushing 51. This restricts the axial movement of the bushing 51 toward the orbiting scroll 26. This prevents the bushing 51 from coming into contact with the orbiting scroll 26, thereby avoiding a problem in which the bushing 51 comes into contact with the orbiting scroll 26 and wears between the orbiting scroll 26 and the bushing 51. The locking portion 72 is integrally molded with the eccentric shaft 50 and passes through the through-hole 57 to lock the bushing 51 so that it can swing. This eliminates the need for a separate member to restrict the axial movement of the bushing 51 toward the orbiting scroll 26. As a result, the durability of the scroll compressor 10 can be improved while reducing the number of components.

[0079] (2) The locking portion 72 has a locking end portion 74 located on the opposite side of the main body portion 71 with the bottom wall 54 of the bush 51 sandwiched therebetween, and is suitable as a configuration that passes through the through hole 57 and locks the bush 51 in a swingable manner.

[0080] (3) The locking end 74 comes into contact with the bottom wall 54 of the bushing 51 in the axial direction of the rotating shaft 15, thereby restricting the axial movement of the rotating shaft 15 in the bushing 51 toward the orbiting scroll 26. The locking end 74 can come into contact with the bottom wall 54 of the bushing 51 in the axial direction of the rotating shaft 15 within a specified range of swing of the bushing 51 defined by the swing restricting portion 63. Such a configuration is suitable as the configuration of the locking portion 72 that passes through the through-hole 57 and locks the bushing 51 so that it can swing.

[0081] (4) The through hole 57 has a pair of hole inner surfaces 58 extending parallel to each other. The locking end portion 74 has a pair of side surfaces 74a extending parallel to each other. The hole inner surfaces 58 and the side surfaces 74a intersect with each other when viewed in the axial direction of the eccentric shaft 50. This configuration is suitable for the through hole 57 and the locking end portion 74.

[0082] (5) For example, it is conceivable to use a circlip to restrict the axial movement of the rotating shaft 15 in the bush 51 toward the orbiting scroll 26. In this case, if the scroll compressor 10 is downsized, a smaller circlip itself must be used accordingly, but the size of an existing circlip may not be sufficient. Also, if the size of the circlip is too small, assembly may be difficult. Therefore, a locking portion 72 that locks the bush 51 is integrally molded with the eccentric shaft 50. With this, even if the scroll compressor 10 is downsized to the extent that the size of an existing circlip is not sufficient, it is possible to restrict the axial movement of the rotating shaft 15 in the bush 51 toward the orbiting scroll 26. Therefore, the scroll compressor 10 can be downsized without considering the size of the circlip.

[0083] (6) There is no need to use a circlip to restrict the axial movement of the rotating shaft 15 in the bushing 51 toward the orbiting scroll 26, so there is no problem of the circlip falling off into the housing 11. Therefore, the reliability of the scroll compressor 10 can be improved.

[0084] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0085] As shown in FIGS. 12 and 13 , the bottom wall 54 of the bushing 51 may be provided with a recess 80 into which the locking end 74 can be fitted. The recess 80 is connected to the through-hole 57. The recess 80 is, for example, a fan-shaped recess in plan view. The recess 80 is configured so that an inner surface 80a of the recess 80 can come into contact with the locking end 74 when the bushing 51 swings around the eccentric shaft 50. The inner surface 80a of the recess 80 functions as a swing restricting portion 63 that restricts the swing of the bushing 51 beyond a specified range by contacting the locking end 74. Therefore, the recess 80 is provided with a swing restricting portion 63 that restricts the swing of the bushing 51 beyond the specified range by contacting the locking end 74. Within the specified swing range of the bushing 51 defined by the swing restricting portion 63, the locking end 74 can come into contact with the bottom wall 54 of the bushing 51 in the axial direction of the rotation shaft 15. With this configuration, the first protrusion 61 and the second protrusion 62 may be omitted.

[0086] 13, the depth H1 of the recess 80 in the axial direction of the rotating shaft 15 is deeper than the gap C11 between the tip end surface 15e of the rotating shaft 15 and the bushing 51. This prevents the locking end 74 from falling out of the recess 80 even if the bushing 51 moves in the axial direction of the rotating shaft 15 toward the rotating shaft 15 between the rotating shaft 15 and the orbiting scroll 26.

[0087] The position of the locking end 74 can be positioned closer to the rotary shaft 15 by the amount that the recess 80 fits into the locking end 74. Therefore, the size of the scroll compressor 10 in the axial direction of the rotary shaft 15 can be reduced.

[0088] The locking end 74 comes into contact with the bottom wall 54 of the bushing 51 in the axial direction of the rotary shaft 15, thereby restricting axial movement of the rotary shaft 15 in the bushing 51 toward the orbiting scroll 26. The recess 80 is provided with a swing restricting portion 63 that restricts swing beyond a specified range by coming into contact with the locking end 74. Therefore, the swing restricting portion 63 can be provided using the recess 80. The locking end 74 can come into contact with the bottom wall 54 of the bushing 51 in the axial direction of the rotary shaft 15 within the specified range of swing of the bushing 51 that is specified by the swing restricting portion 63. This configuration is suitable as the configuration of the locking portion 72 that passes through the through-hole 57 and locks the bushing 51 so that it can swing.

[0089] In the embodiment, the through hole 57 does not have to have the pair of inner hole surfaces 58, and the locking end 74 does not have to have the pair of side surfaces 74a. In short, the shapes of the through hole 57 and the locking end 74 are not particularly limited as long as the locking end 74 passes through the through hole 57 and has a shape that allows the locking end 74 to swingably lock the bushing 51.

[0090] In the above embodiment, the eccentric shaft 50 may be integrally formed with the rotary shaft 15 . In the above embodiment, the sub-balancer 56 may be separate from the bushing 51. In the above-described embodiment, the scroll compressor 10 does not have to be a type that is driven by the motor 22, but may be a type that is driven by, for example, a vehicle engine.

[0091] In the above embodiment, the scroll compressor 10 is used in a vehicle air conditioner, but the use of the scroll compressor 10 is not limited thereto. In short, the scroll compressor 10 may be used in any application as long as it compresses a refrigerant, and the use of the scroll compressor 10 may be changed as appropriate.

[0092] In the above-described embodiment, the object to be compressed by the scroll compressor 10 is not limited to a refrigerant, and may be a fluid such as air. The above embodiment includes the configurations described in the following supplementary notes.

[0093] <Appendix 1> Housing and a rotation shaft rotatably supported relative to the housing; a fixed scroll fixed to the housing; an orbiting scroll that forms a compression chamber together with the fixed scroll by rotation of the rotary shaft, The rotation shaft is provided with an eccentric shaft extending parallel to the rotation shaft at a position eccentric to the axis of the rotation shaft, a bottomed cylindrical bushing that is swingable around the eccentric shaft between the rotary shaft and the orbiting scroll is inserted in the eccentric shaft, A through hole is provided in the bottom wall of the bush, The scroll compressor is characterized in that a locking portion that passes through the through hole and locks the bushing so that the bushing can swing is integrally molded on the eccentric shaft.

[0094] <Appendix 2> the eccentric shaft has a main body portion accommodated inside the bushing, The scroll compressor described in <Appendix 1>, characterized in that the engaging portion has an engaging end portion provided on the opposite side of the main body portion with the bottom wall of the bush in between.

[0095] <Appendix 3> The bushing is provided with a swing restricting portion that restricts swing beyond a specified range by contacting the rotating shaft, The scroll compressor described in <Appendix 2>, characterized in that within a specified range of swing of the bush defined by the swing regulating portion, the engaging end portion is capable of contacting the bottom wall of the bush in the axial direction of the rotating shaft.

[0096] <Appendix 4> The scroll compressor according to <Appendix 2>, wherein the bottom wall of the bush is provided with a recess that communicates with the through hole and into which the engaging end portion can be fitted.

[0097] <Appendix 5> The recess is provided with a swing restricting portion that restricts swing beyond a specified range by contacting the locking end portion, The scroll compressor described in <Appendix 4>, characterized in that within a specified range of swing of the bush defined by the swing regulating portion, the engaging end portion is capable of contacting the bottom wall of the bush in the axial direction of the rotating shaft.

[0098] <Appendix 6> The scroll compressor according to <Appendix 4> or <Appendix 5>, wherein a depth of the recess in the axial direction of the rotating shaft is deeper than a gap between the rotating shaft and the bushing.

[0099] <Appendix 7> The through hole has a pair of inner hole surfaces extending parallel to each other, The locking end portion has a pair of side surfaces extending parallel to each other, The scroll compressor according to any one of <Appendix 2> to <Appendix 6>, wherein the inner surfaces of the holes and the side surfaces intersect with each other when viewed in the axial direction of the eccentric shaft. [Explanation of symbols]

[0100] 10...Scroll compressor, 11...Housing, 15...Rotating shaft, 25...Fixed scroll, 26...Orbiting scroll, 27...Compression chamber, 50...Eccentric shaft, 51...Bush, 54...Bottom wall, 57...Through hole, 58...Inner surface of hole, 63...Swing regulating portion, 71...Main body, 72...Engaging portion, 74...Engaging end portion, 74a...Side surface, 80...Recess, C11...Gap

Claims

1. Housing and a rotation shaft rotatably supported relative to the housing; a fixed scroll fixed to the housing; an orbiting scroll that forms a compression chamber together with the fixed scroll by rotation of the rotary shaft, The rotation shaft is provided with an eccentric shaft extending parallel to the rotation shaft at a position eccentric to the axis of the rotation shaft, a bottomed cylindrical bushing that is swingable around the eccentric shaft between the rotary shaft and the orbiting scroll is inserted in the eccentric shaft, A through hole is provided in the bottom wall of the bush, The scroll compressor is characterized in that a locking portion that passes through the through hole and locks the bushing so that the bushing can swing is integrally molded on the eccentric shaft.

2. the eccentric shaft has a main body portion accommodated inside the bushing, 2. The scroll compressor according to claim 1, wherein the engaging portion has an engaging end portion provided on the opposite side of the main body portion with the bottom wall of the bushing interposed therebetween.

3. The bushing is provided with a swing restricting portion that restricts swing beyond a specified range by contacting the rotating shaft, 3. The scroll compressor according to claim 2, wherein the engaging end portion is capable of contacting the bottom wall of the bushing in the axial direction of the rotating shaft within a specified range of swing of the bushing defined by the swing restricting portion.

4. 3. The scroll compressor according to claim 2, wherein the bottom wall of the bushing is provided with a recess that communicates with the through hole and into which the engaging end portion can be fitted.

5. The recess is provided with a swing restricting portion that restricts swing beyond a specified range by contacting the locking end portion, 5. The scroll compressor according to claim 4, wherein the engaging end portion is capable of contacting the bottom wall of the bushing in the axial direction of the rotating shaft within a specified range of swing of the bushing defined by the swing restricting portion.

6. 6. The scroll compressor according to claim 4, wherein the depth of the recess in the axial direction of the rotary shaft is deeper than a gap between the rotary shaft and the bushing.

7. The through hole has a pair of inner hole surfaces extending parallel to each other, The locking end portion has a pair of side surfaces extending parallel to each other, 3. The scroll compressor according to claim 2, wherein the inner surfaces of the holes and the side surfaces intersect with each other when viewed in the axial direction of the eccentric shaft.

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