Scroll-type compressor

Abstract

To suppress a deterioration in noise.SOLUTION: A scroll-type compressor 10 includes a sub balancer 60 and a swing transmission part 70. When a bush balancer 50 is swung, the sub balancer 60 is swung in a direction opposite from a swing direction of the bush balancer 50 by making a protrusion part 71 press a recess part 72. Therefor, the position of a center W2 of gravity of the sub balancer 60 is moved in a direction opposite from the swing direction of the bush balancer 50 with respect to a position before the sub balancer 60 is swung. As a result, the sub balancer 60 suppresses unbalance of balance between the position of a center W1 of gravity of the bush balancer 50 and centrifugal force acting on revolving scroll at a rotating shaft by being shifted in the swing direction of the bush balancer 50 with respect to the position before the bush balancer 50 is swung. Therefore, vibrations of the rotating shaft can be suppressed.SELECTED DRAWING: Figure 7

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 rotating shaft, an eccentric shaft, a fixed scroll, an orbiting scroll, and a bushing. The eccentric shaft protrudes from the tip of the rotating shaft. The eccentric shaft extends parallel to the rotating shaft at a position eccentric to the axis of the rotating shaft. The fixed scroll has a fixed base plate and a fixed spiral wall. The fixed spiral wall stands upright from the fixed base plate. The orbiting scroll has an orbiting base plate and an orbiting spiral wall. The orbiting base plate faces the fixed base plate. The orbiting spiral wall stands upright from the orbiting base plate toward the fixed base plate. The orbiting spiral wall meshes with the fixed spiral wall.

[0003] The bushing has a cylindrical portion that is inserted into the orbiting base plate so as to be rotatable relative to the base plate. An insertion hole is formed in the cylindrical portion. An eccentric shaft is inserted into the insertion hole. The bushing is configured to be swingable about the eccentric shaft. In such a scroll compressor, the orbital radius of the orbiting scroll is varied by the swing of the bushing about the eccentric shaft. The variable orbital radius of the orbiting scroll allows the orbiting scroll wall to be appropriately pressed against the fixed scroll wall.

[0004] In a scroll compressor, centrifugal force acts on the orbiting scroll as the orbiting scroll revolves. This can cause the orbiting scroll wall to be excessively pressed against the fixed scroll wall. To address this issue, scroll compressors have been known that include a bush balancer in which a bush protrudes radially outward from a cylindrical portion. Centrifugal force acts on the bush balancer as the rotating shaft rotates. The centrifugal force acting on the bush balancer offsets the centrifugal force acting on the orbiting scroll. This prevents the orbiting scroll wall from being excessively pressed against the fixed scroll wall. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-160313 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the bushing swings, the bushing balancer also swings, causing the center of gravity of the bushing balancer to shift in the direction of the bushing balancer's swing relative to its position before the bushing balancer swung. This can cause an imbalance between the centrifugal force acting on the orbiting scroll and the rotating shaft. This can easily cause vibrations in the rotating shaft, which can lead to increased noise in the scroll compressor. Therefore, it is desirable to suppress the increase in noise in scroll compressors. [Means for solving the problem]

[0007] A scroll compressor that solves the above-mentioned problems includes a rotating shaft, an eccentric shaft that protrudes from a tip of the rotating shaft and extends parallel to the rotating shaft at a position eccentric to the axis of the rotating shaft, a fixed scroll having a fixed base plate and a fixed spiral wall that stands up from the fixed base plate, an orbiting base plate that faces the fixed base plate, and an orbiting scroll having an orbiting spiral wall that stands up from the orbiting base plate toward the fixed base plate and engages with the fixed spiral wall, and a bushing that has an insertion hole into which the eccentric shaft is inserted and that is swingable around the eccentric shaft, the bushing having the insertion hole formed therein and that is inserted into the orbiting base plate so as to be rotatable relative to the eccentric shaft, and a cylindrical portion that is inserted into the orbiting base plate so as to be rotatable relative to the eccentric shaft, a sub-balancer that is disposed between the rotating shaft and the bush balancer with the eccentric shaft inserted into the insertion hole of the bush and that can swing around a position eccentric with respect to the axis of the rotating shaft and the axis of the eccentric shaft when viewed from the axial direction of the rotating shaft; and a swing transmission unit that, as the bush balancer swings, causes a pressing portion provided on the bush balancer to press a pressed portion provided on the sub-balancer, thereby swinging the sub-balancer in a direction opposite to the swing direction of the bush balancer.

[0008] According to this, when the bushing swings and the bush balancer swings at the same time, the pressing portion presses the pressed portion, causing the sub-balancer to swing in the opposite direction to the swing direction of the bush balancer. Therefore, the position of the center of gravity of the sub-balancer moves in the opposite direction to the swing direction of the bush balancer, relative to its position before the sub-balancer swung. As a result, the sub-balancer can suppress imbalance with the centrifugal force acting on the orbiting scroll in the rotating shaft, which occurs when the position of the center of gravity of the bush balancer shifts in the swing direction of the bush balancer, relative to its position before the bush balancer swung. This suppresses vibration of the rotating shaft, thereby suppressing noise deterioration in the scroll compressor.

[0009] The scroll compressor may further include a sub-eccentric shaft that protrudes from the tip of the rotating shaft and extends parallel to the rotating shaft at a position eccentric with respect to the axis of the rotating shaft and the axis of the eccentric shaft, the sub-balancer may have a sub-insertion hole into which the sub-eccentric shaft is inserted, and the sub-balancer may be swingable around the sub-eccentric shaft.

[0010] This configuration is suitable for swinging the sub-balancer relative to the rotary shaft about a position eccentric to the axis of the rotary shaft and the axis of the eccentric shaft, as viewed in the axial direction of the rotary shaft.

[0011] In the scroll compressor, the pressing portion may be a convex portion provided on the bush, and the pressed portion may be a concave portion provided on the sub-balancer and into which the convex portion is inserted.

[0012] This configuration is suitable for forming a swing transmission section that swings the sub-balancer in the opposite direction to the swing direction of the bush balancer. In the scroll compressor, the recess may be in the shape of an elongated hole.

[0013] This makes it easier to guide the convex portion inside the concave portion when the bush balancer swings, allowing the sub-balancer to swing smoothly in the opposite direction to the swing direction of the bush balancer. [Effects of the Invention]

[0014] According to the present invention, it is possible to suppress the deterioration of noise. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view of a scroll compressor according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view showing the relationship between the bush balancer and the sub-balancer. [Figure 3]FIG. 3 is a cross-sectional view showing the relationship between the bush balancer and the sub-balancer. [Figure 4] FIG. 4 is a side view showing the relationship between the eccentric shaft and the sub-eccentric shaft. [Figure 5] FIG. 5 is an enlarged cross-sectional view showing the relationship between the bush balancer and the sub-balancer. [Figure 6] FIG. 6 is a cross-sectional view for explaining the operation. [Figure 7] FIG. 7 is a cross-sectional view for explaining the operation. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of a scroll compressor will be described below with reference to Figures 1 to 7. The scroll compressor of this embodiment is used, for example, in 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.

[0017] 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 fluid. 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.

[0018] 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.

[0019] 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 the end of the outer periphery of the peripheral wall 18 opposite the end wall 17.

[0020] 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.

[0021] 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 L1 of the rotating shaft 15 at a position eccentric to the axis L1 of the rotating shaft 15.

[0022] 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.

[0023] The 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 FIG. 1.

[0024] 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.

[0025] 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 in the rotor core 24a.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] The scroll compressor 10 has 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 is in communication with the discharge port 25h. The refrigerant compressed in the compression chamber 27 is discharged into the discharge chamber 40. The discharge housing 14 has a discharge port 14h. The discharge port 14h is formed in the end wall 14a of the discharge housing 14. The discharge port 14h discharges the refrigerant discharged into the discharge chamber 40 to the outside of the housing 11.

[0041] <Eccentric shaft> The scroll compressor 10 includes an eccentric shaft 41. The eccentric shaft 41 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 41 extends parallel to the rotating shaft 15 at a position eccentric to the axis L1 of the rotating shaft 15. The eccentric shaft 41 is cylindrical. The eccentric shaft 41 is a separate member from the rotating shaft 15. The axial direction of the eccentric shaft 41 coincides with the axial direction of the rotating shaft 15. The eccentric shaft 41 protrudes from the tip end surface 15e of the rotating shaft 15 toward the orbiting scroll 26. Therefore, the eccentric shaft 41 protrudes from the tip of the rotating shaft 15. The eccentric shaft 41 is inserted into the boss portion 28.

[0042] <Bush> The scroll compressor 10 includes a bushing 42. The bushing 42 has a cylindrical portion 43. An insertion hole 44 is formed in the cylindrical portion 43. Therefore, the bushing 42 has the insertion hole 44. The insertion hole 44 penetrates the cylindrical portion 43 in the axial direction of the cylindrical portion 43. The insertion hole 44 is a circular hole. An eccentric shaft 41 is inserted into the insertion hole 44. The eccentric shaft 41 is inserted into the insertion hole 44 with the axis L2 of the eccentric shaft 41 aligned with the axis of the insertion hole 44. The bushing 42 can swing around the eccentric shaft 41. A majority of the cylindrical portion 43 is disposed inside the boss portion 28. Therefore, the cylindrical portion 43 is inserted into the swivel base plate 26a so as to be rotatable relative to the swivel base plate 26a. The end of the cylindrical portion 43 on the rotary shaft 15 side protrudes from the boss portion 28.

[0043] The scroll compressor 10 includes a bearing 46. The bearing 46 is, for example, a cylindrical plain bearing. The bearing 46 is disposed inside the boss portion 28. The bearing 46 is disposed between the inner peripheral surface of the boss portion 28 and the outer peripheral surface of the cylindrical portion 43 of the bushing 42. The bushing 42 is rotatably supported by the boss portion 28 via the bearing 46.

[0044] The rotation of the rotary shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 41, the bushing 42, and the bearing 46. This causes the orbiting scroll 26 to rotate on its axis. Then, 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, and only allows the orbiting scroll 26 to revolve. As a result, the orbiting scroll 26 revolves while the orbiting spiral wall 26b is in contact with the fixed spiral wall 25b. As the orbiting scroll 26 revolves, the volume of the compression chamber 27 decreases, and the refrigerant is compressed in the compression chamber 27. As the rotary shaft 15 rotates, the orbiting scroll 26 revolves inside the outer peripheral wall 25c.

[0045] <Bush Balancer> The bushing 42 has a bushing balancer 50. The bushing balancer 50 protrudes from the cylindrical portion 43 radially outward of the cylindrical portion 43. The bushing balancer 50 is continuous with the end of the portion of the cylindrical portion 43 that protrudes from the boss portion 28. The bushing balancer 50 is provided integrally with the cylindrical portion 43. The bushing balancer 50 is formed integrally with the cylindrical portion 43. The bushing balancer 50 is housed within the peripheral wall 18 of the support housing 13.

[0046] As shown in FIG. 2 , the bush balancer 50 is plate-shaped. The bush balancer 50 is disposed relative to the rotating shaft 15 with the thickness direction of the bush balancer 50 coinciding with the axial direction of the rotating shaft 15. When viewed in the axial direction of the rotating shaft 15, the bush balancer 50 is fan-shaped. The bush balancer 50 is provided relative to the cylindrical portion 43 such that the cylindrical portion 43 protrudes from a first end face 50a located on one side in the thickness direction of the bush balancer 50. Therefore, the cylindrical portion 43 is continuous with the first end face 50a of the bush balancer 50. An insertion hole 44 penetrates the bush balancer 50. Therefore, the bush balancer 50 forms a part of the insertion hole 44.

[0047] The bush balancer 50 has an arcuate edge 51, a pair of extending edges 52, and a connecting edge 53. The arcuate edge 51 extends along the outer peripheral surface of the cylindrical portion 43. The pair of extending edges 52 extend from the arcuate edge 51. The pair of extending edges 52 extend in directions that increase their distance from each other as they move away from the arcuate edge 51. The connecting edge 53 connects the ends of each extending edge 52 on the opposite side from the arcuate edge 51. The connecting edge 53 extends in an arc shape that convexly extends away from the arcuate edge 51. The bush balancer 50 has a constant thickness.

[0048] 3, when viewed from the axial direction of the rotating shaft 15, the insertion hole 44 penetrates the cylindrical portion 43 and the bush balancer 50 with the axis of the insertion hole 44 disposed at a position eccentric to the axis L3 of the cylindrical portion 43. Therefore, the eccentric shaft 41 is inserted into the insertion hole 44 with the axis L2 of the eccentric shaft 41 disposed at a position eccentric to the axis L3 of the cylindrical portion 43.

[0049] The axis L3 of the cylindrical portion 43 coincides with the center of the orbiting base plate 26a of the orbiting scroll 26 when viewed from the axial direction of the rotary shaft 15. The center of the orbiting base plate 26a of the orbiting scroll 26 coincides with the center of gravity of the orbiting scroll 26 when viewed from the axial direction of the rotary shaft 15. The center of gravity W1 of the bush balancer 50 is located on the opposite side of the axis L2 of the eccentric shaft 41 from the center of gravity of the orbiting scroll 26 when viewed from the axial direction of the rotary shaft 15.

[0050] <Sub-balancer> 1, the scroll compressor 10 includes a sub-balancer 60. The sub-balancer 60 is disposed between the tip end surface 15e of the rotary shaft 15 and the bush balancer 50.

[0051] 2 and 3, the sub-balancer 60 is plate-shaped. The sub-balancer 60 is disposed relative to the rotating shaft 15 with the thickness direction of the sub-balancer 60 coinciding with the axial direction of the rotating shaft 15. The sub-balancer 60 is fan-shaped when viewed in the axial direction of the rotating shaft 15. The sub-balancer 60 has a main body 61 and a weight portion 62. The sub-balancer 60 is disposed relative to the bush balancer 50 with a first end face 61a located on one side of the main body 61 in the thickness direction facing a second end face 50b located on the other side of the bush balancer 50 in the thickness direction.

[0052] A through hole 63 is formed in the main body 61. The through hole 63 is a circular hole. The through hole 63 penetrates the main body 61 in the thickness direction of the main body 61. The diameter of the through hole 63 is larger than the diameter of the insertion hole 44. The through hole 63 is disposed at a position where the axis of the through hole 63 can coincide with the axis of the insertion hole 44.

[0053] The main body 61 has an arcuate edge 64, a pair of extending edges 65, and a connecting edge 66. The arcuate edge 64 extends along the arcuate edge 51 of the bush balancer 50 when the axis of the through hole 63 is aligned with the axis of the insertion hole 44. The pair of extending edges 65 extend from the arcuate edge 64. The pair of extending edges 65 extend in directions that increase in distance from each other as they move away from the arcuate edge 64. The pair of extending edges 65 extend along the extending edges 52 of the bush balancer 50 when the axis of the through hole 63 is aligned with the axis of the insertion hole 44. The connecting edge 66 connects the ends of the extending edges 65 opposite the arcuate edge 64. The connecting edge 66 extends in an arcuate shape that convexly extends away from the arcuate edge 64. The connecting edge 66 extends along the connecting edge 53 of the bush balancer 50 when the axis of the through hole 63 is aligned with the axis of the insertion hole 44. The outer shape of the main body 61 when viewed from the thickness direction of the main body 61 is the same as the outer shape of the bush balancer 50 when viewed from the thickness direction of the bush balancer 50. The thickness of the main body 61 is constant.

[0054] The weight portion 62 protrudes from a second end surface 61b located on the other side in the thickness direction of the main body portion 61. The weight portion 62 is continuous with each extending edge 65 and the connecting edge 66. As shown in FIG. 1, the weight portion 62 is located radially outward of the rotating shaft 15 with respect to the outer circumferential surface of the rotating shaft 15. The eccentric shaft 41 is inserted into the insertion hole 44 via the through hole 63. Therefore, the sub-balancer 60 is disposed between the rotating shaft 15 and the bush balancer 50 with the eccentric shaft 41 inserted into the insertion hole 44 of the bush 42.

[0055] 3, the center of gravity W2 of the sub-balancer 60 is located on the opposite side of the axis L2 of the eccentric shaft 41 from the center of gravity of the orbiting scroll 26, as viewed in the axial direction of the rotating shaft 15. When the axis of the through hole 63 coincides with the axis of the insertion hole 44, the center of gravity W2 of the sub-balancer 60 coincides with the center of gravity W1 of the bush balancer 50, as viewed in the axial direction of the rotating shaft 15.

[0056] <Sub-insertion hole> As shown in Figures 2 and 3, a sub-insertion hole 67 is formed in the main body portion 61. Therefore, the sub-balancer 60 is formed with the sub-insertion hole 67. The sub-insertion hole 67 penetrates the main body portion 61 in the thickness direction of the main body portion 61. The sub-insertion hole 67 is a circular hole. The diameter of the sub-insertion hole 67 is smaller than the diameter of the through-hole 63 and the diameter of the insertion hole 44. The sub-insertion hole 67 is located on the opposite side of the through-hole 63 from the weight portion 62.

[0057] <Sub-eccentric shaft> As shown in Fig. 4, the scroll compressor 10 includes a sub-eccentric shaft 68. The sub-eccentric shaft 68 protrudes from the tip end surface 15e of the rotating shaft 15. Therefore, the sub-eccentric shaft 68 protrudes from the tip of the rotating shaft 15. The sub-eccentric shaft 68 extends parallel to the rotating shaft 15 at a position eccentric with respect to the axis L1 of the rotating shaft 15 and the axis L2 of the eccentric shaft 41. The axial direction of the sub-eccentric shaft 68 coincides with the axial direction of the rotating shaft 15. The sub-eccentric shaft 68 is cylindrical.

[0058] 3, a sub-eccentric shaft 68 is inserted into the sub-insertion hole 67. The sub-eccentric shaft 68 is inserted into the sub-insertion hole 67 with the axis L4 of the sub-eccentric shaft 68 coinciding with the axis of the sub-insertion hole 67. The sub-balancer 60 is swingable about the sub-eccentric shaft 68. Therefore, when viewed in the axial direction of the rotating shaft 15, the sub-balancer 60 is swingable about a position eccentric with respect to the axis L1 of the rotating shaft 15 and the axis L2 of the eccentric shaft 41.

[0059] Since the diameter of the through hole 63 is larger than the diameter of the insertion hole 44, the sub-balancer 60 can swing around the sub-eccentric shaft 68 by the amount of the clearance formed between the eccentric shaft 41 and the through hole 63.

[0060] <Swing transmission part> As shown in FIGS. 2 and 3 , the scroll compressor 10 includes a swing transmission section 70. The swing transmission section 70 is composed of a protrusion 71 and a recess 72. The protrusion 71 is a pressing section provided on the bush balancer 50. Therefore, the pressing section provided on the bush balancer 50 is the protrusion 71 provided on the bush 42. The protrusion 71 protrudes from a portion of the second end surface 50b of the bush balancer 50 that is located on the opposite side of the insertion hole 44 from the connecting edge 53. The protrusion 71 is cylindrical. The protrusion length of the protrusion 71 from the second end surface 50b of the bush balancer 50 is the same as the thickness of the main body 61 of the sub-balancer 60.

[0061] The recess 72 is provided in the main body 61 of the sub-balancer 60. The recess 72 is a pressed portion provided in the sub-balancer 60. Therefore, the pressed portion provided in the sub-balancer 60 is the recess 72. The recess 72 is a hole that penetrates the main body 61 in the thickness direction of the main body 61. The recess 72 has an elongated hole shape. The protrusion 71 is inserted into the recess 72.

[0062] 5, when viewed from the axial direction of the rotation shaft 15, a line that is perpendicular to a first line L11 that is a line that passes through the axis L2 of the eccentric shaft 41 and the axis L4 of the sub-eccentric shaft 68 and that passes through the axis L2 of the eccentric shaft 41 is defined as a second line L12. Furthermore, when viewed from the axial direction of the rotation shaft 15, a line that is perpendicular to the first line L11 and that passes through the axis L4 of the sub-eccentric shaft 68 is defined as a third line L13.

[0063] In this case, the convex portion 71 is provided in a portion of the bushing 42 located between the second line L12 and the third line L13 when viewed in the axial direction of the rotary shaft 15. The concave portion 72 is provided in a portion of the sub-balancer 60 located between the second line L12 and the third line L13 when viewed in the axial direction of the rotary shaft 15. In this way, the swing transmission portion 70 is located between the second line L12 and the third line L13 when viewed in the axial direction of the rotary shaft 15.

[0064] In other words, the convex portion 71 is provided in the bushing 42 at a portion located closer to the sub-eccentric shaft 68 than the second straight line L12 about the eccentric shaft 41 and closer to the eccentric shaft 41 than the third straight line L13 about the sub-eccentric shaft 68, as viewed in the axial direction of the rotating shaft 15. The concave portion 72 is provided in the sub-balancer 60 at a portion located closer to the sub-eccentric shaft 68 than the second straight line L12 about the eccentric shaft 41 and closer to the eccentric shaft 41 than the third straight line L13 about the sub-eccentric shaft 68, as viewed in the axial direction of the rotating shaft 15. In this way, the swing transmission portion 70 is located closer to the sub-eccentric shaft 68 than the second straight line L12 about the eccentric shaft 41 and closer to the eccentric shaft 41 than the third straight line L13 about the sub-eccentric shaft 68, as viewed in the axial direction of the rotating shaft 15.

[0065] <Driven crank mechanism> The axis L3 of the cylindrical portion 43 of the bushing 42 is located radially outward of the axis L1 of the rotary shaft 15. Since the center of the orbiting base plate 26a coincides with the axis L3 of the cylindrical portion 43, the distance between the axis L3 of the cylindrical portion 43 and the axis L1 of the rotary shaft 15 is the orbital radius of the orbiting scroll 26.

[0066] When the bushing 42 swings around the eccentric shaft 41, the distance between the axis L3 of the cylindrical portion 43 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 41, the bushing 42, and the bearing 46 constitute a so-called driven crank mechanism 32 that varies the orbital radius of the orbiting scroll 26. Such a driven crank mechanism 32 is already known.

[0067] <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.

[0068] When the rotating shaft 15 rotates in the forward direction, the bushing 42 swings about the eccentric shaft 41 due to the compressive load acting on the orbiting scroll 26. When the bushing 42 swings about the eccentric shaft 41, the distance between the axis L3 of the cylindrical portion 43 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 42 about the eccentric shaft 41 is restricted. This fixes the orbital radius of the orbiting scroll 26.

[0069] Furthermore, the rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 41, the bushing 42, and the bearing 46, 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 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 contacts 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.

[0070] When assembling the orbiting scroll 26 to the fixed scroll 25, the bushing 42 is swung about the eccentric shaft 41 in the direction opposite to the direction in which the rotary shaft 15 rotates in the forward direction. This reduces the distance between the axis L3 of the cylindrical portion 43 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.

[0071] When the bushing 42 swings about the eccentric shaft 41 in the direction opposite to when the rotary shaft 15 is rotating in the forward direction, the bushing 42 is restricted from swinging until the distance between the axis L3 of the cylindrical portion 43 and the axis L1 of the rotary shaft 15 increases. When the bushing 42 swings about the eccentric shaft 41 in the direction opposite to when the rotary shaft 15 is rotating in the forward direction, the swing of the bushing 42 is restricted when the distance between the axis L3 of the cylindrical portion 43 and the axis L1 of the rotary shaft 15 becomes the shortest.

[0072] [Operation of the embodiment] Next, the operation of the embodiment will be described. Centrifugal force acts on the orbiting scroll 26 as the orbiting scroll 26 revolves. Centrifugal force acts on the bush balancer 50 and the sub-balancer 60 as the rotary shaft 15 rotates. The centrifugal force acting on the orbiting scroll 26 is canceled out by the centrifugal force acting on the bush balancer 50 and the centrifugal force acting on the sub-balancer 60. This prevents the orbiting spiral wall 26b from being pressed excessively against the fixed spiral wall 25b.

[0073] As shown in FIG. 5, for example, when the axis of the through-hole 63 is aligned with the axis of the insertion hole 44, the bushing balancer 50 swings together with the bushing 42 around the eccentric shaft 41 in the direction of arrow A11 shown in FIG. 5. Then, simultaneously with the swing of the bushing balancer 50, the convex portion 71 also swings around the eccentric shaft 41 in the direction of arrow A11. As a result, the convex portion 71 presses against the inner surface of the concave portion 72. A pressing force F11 acting on the sub-balancer 60 from the convex portion 71 via the concave portion 72 causes the sub-balancer 60 to swing in the direction of arrow A21 shown in FIG. 5 around the sub-eccentric shaft 68. Therefore, the swing of the bushing balancer 50 is transmitted to the sub-balancer 60 via the convex portion 71 and the concave portion 72, causing the sub-balancer 60 to swing in the direction of arrow A21 shown in FIG. 5 around the sub-eccentric shaft 68. As a result, the sub-balancer 60 swings in the direction opposite to the swing direction of the bush balancer 50.

[0074] On the other hand, for example, when the axis of the through-hole 63 is aligned with the axis of the insertion hole 44, suppose that the bushing balancer 50 swings together with the bushing 42 about the eccentric shaft 41 in the direction of arrow A12, which is the opposite direction to arrow A11 in FIG. 5 . Then, simultaneously with the swing of the bushing balancer 50, the convex portion 71 also swings about the eccentric shaft 41 in the direction of arrow A12. As a result, the convex portion 71 presses against the inner surface of the concave portion 72. A pressing force F12 acting on the sub-balancer 60 from the convex portion 71 via the concave portion 72 causes the sub-balancer 60 to swing about the sub-eccentric shaft 68 in the direction of arrow A22, which is the opposite direction to arrow A21 in FIG. 5 . Therefore, the swing of the bushing balancer 50 is transmitted to the sub-balancer 60 via the convex portion 71 and the concave portion 72, causing the sub-balancer 60 to swing about the sub-eccentric shaft 68 in the direction of arrow A22 in FIG. 5 . As a result, the sub-balancer 60 swings in the direction opposite to the swing direction of the bush balancer 50.

[0075] In this way, as the bush balancer 50 swings, the swing transmission unit 70 causes the convex portion 71 to press the concave portion 72 , thereby causing the sub-balancer 60 to swing in the opposite direction to the swing direction of the bush balancer 50 .

[0076] 6 and 7 , when the bush balancer 50 swings, the position of the center of gravity W1 of the bush balancer 50 moves in the swing direction of the bush balancer 50 relative to the position before the bush balancer 50 swung. Furthermore, when the sub-balancer 60 swings, the position of the center of gravity W2 of the sub-balancer 60 moves in the swing direction of the sub-balancer 60 relative to the position before the sub-balancer 60 swung. In this way, the position of the center of gravity W2 of the sub-balancer 60 moves in the opposite direction to the swing direction of the bush balancer 50 relative to the position before the sub-balancer 60 swung. As a result, the imbalance between the centrifugal force acting on the orbiting scroll 26 at the rotating shaft 15, which occurs when the position of the center of gravity W1 of the bush balancer 50 shifts in the swing direction of the bush balancer 50 relative to the position before the bush balancer 50 swung, is suppressed by the sub-balancer 60.

[0077] [Effects of the embodiment] The embodiment can provide the following effects. (1) The scroll compressor 10 includes a sub-balancer 60 and a swing transmission unit 70. When the bush balancer 50 swings simultaneously with the bush 42, the convex portion 71 presses the concave portion 72, causing the sub-balancer 60 to swing in the direction opposite to the swing direction of the bush balancer 50. Therefore, the position of the center of gravity W2 of the sub-balancer 60 moves in the direction opposite to the swing direction of the bush balancer 50, relative to the position before the sub-balancer 60 swung. As a result, the sub-balancer 60 can suppress imbalance between the centrifugal force acting on the orbiting scroll 26 in the rotating shaft 15, which occurs when the position of the center of gravity W1 of the bush balancer 50 shifts in the swing direction of the bush balancer 50, relative to the position before the bush balancer 50 swung. This suppresses vibration of the rotating shaft 15, thereby suppressing noise deterioration in the scroll compressor 10.

[0078] (2) The scroll compressor 10 is provided with a sub-eccentric shaft 68 that protrudes from the tip 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 and the axis L2 of the eccentric shaft 41. The sub-balancer 60 is formed with a sub-insertion hole 67 into which the sub-eccentric shaft 68 is inserted. The sub-balancer 60 is swingable about the sub-eccentric shaft 68. This configuration is suitable as a configuration in which the sub-balancer 60 swings relative to the rotating shaft 15 about a position eccentric with respect to the axis L1 of the rotating shaft 15 and the axis L2 of the eccentric shaft 41, as viewed in the axial direction of the rotating shaft 15.

[0079] (3) The configuration in which the pressing portion is the convex portion 71 and the pressed portion is the concave portion 72 is suitable for configuring the swing transmission portion 70 that swings the sub-balancer 60 in the opposite direction to the swing direction of the bush balancer 50.

[0080] (4) The recess 72 has an elongated hole shape. This makes it easier to guide the protrusion 71 inside the recess 72 when the bush balancer 50 swings, allowing the sub-balancer 60 to swing smoothly in the direction opposite to the swing direction of the bush balancer 50.

[0081] [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.

[0082] In the embodiment, the scroll compressor 10 may include, for example, a sub-eccentric shaft 68 that protrudes from the sub-balancer 60 and extends parallel to the rotating shaft 15 at a position eccentric with respect to the axis L1 of the rotating shaft 15 and the axis L2 of the eccentric shaft 41. A sub-insertion hole 67 into which the sub-eccentric shaft 68 is inserted may be formed in the tip end surface 15e of the rotating shaft 15.

[0083] In the above embodiment, the recess 72 may be, for example, a groove that does not penetrate the main body 61 in the thickness direction of the main body 61 . In the embodiment, for example, the pressing portion provided on the bush balancer 50 may be a recess, and the pressed portion provided on the sub-balancer 60 may be a protrusion that is inserted into the recess. In short, the swing transmission unit 70 may be configured so that the pressing portion provided on the bush balancer 50 presses the pressed portion provided on the sub-balancer 60, thereby swinging the sub-balancer 60 in the direction opposite to the swing direction of the bush balancer 50.

[0084] In the embodiment, for example, a protrusion that can be engaged with the protrusion 71 may be provided on the sub-balancer 60, and the protrusion and the protrusion may form the swing transmission unit 70. In this case, the protrusion provided on the sub-balancer 60 is the pressed portion. In short, the swing transmission unit 70 may be configured so that the pressing portion provided on the bush balancer 50 presses the pressed portion provided on the sub-balancer 60, thereby swinging the sub-balancer 60 in the direction opposite to the swing direction of the bush balancer 50.

[0085] In the above embodiment, the recess 72 may be, for example, an elongated hole extending in an arc shape centered on the sub-eccentric shaft 68 . In the above embodiment, the shape of the recess 72 is not limited to an elongated hole shape.

[0086] In the above embodiment, the through hole 63 is not limited to being a circular hole having a diameter larger than that of the insertion hole 44. In short, it is sufficient that a clearance is formed between the eccentric shaft 41 and the through hole 63 and the sub-balancer 60 is able to swing around the sub-eccentric shaft 68.

[0087] In the above embodiment, the eccentric shaft 41 may be integrally formed with the rotary shaft 15 . 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.

[0088] 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.

[0089] 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. [Explanation of symbols]

[0090] 10...Scroll compressor, 15...Rotating shaft, 25...Fixed scroll, 25a...Fixed base plate, 25b...Fixed spiral wall, 26...Orbiting scroll, 26a...Orbiting base plate, 26b...Orbiting spiral wall, 41...Eccentric shaft, 42...Bush, 43...Cylindrical portion, 44...Insertion hole, 50...Bush balancer, 60...Sub-balancer, 67...Sub-insertion hole, 68...Sub-eccentric shaft, 70...Swing transmission portion, 71...Convex portion which is a pressing portion, 72...Concave portion which is a pressed portion.

Claims

1. A rotation axis; an eccentric shaft that protrudes from the tip of the rotary shaft and extends parallel to the rotary shaft at a position eccentric with respect to the axis of the rotary shaft; a fixed scroll having a fixed base plate and a fixed spiral wall standing upright from the fixed base plate; an orbiting scroll having an orbiting base plate facing the fixed base plate and an orbiting spiral wall rising from the orbiting base plate toward the fixed base plate and engaging with the fixed spiral wall; a bushing having an insertion hole into which the eccentric shaft is inserted and swingable around the eccentric shaft, The bushing is a cylindrical portion having the insertion hole formed therein and inserted into the swivel base plate so as to be rotatable relative to the swivel base plate; a bush balancer protruding from the cylindrical portion to a radially outer side of the cylindrical portion, a sub-balancer that is disposed between the rotary shaft and the bush balancer with the eccentric shaft inserted into the insertion hole of the bush, and that is swingable about a position eccentric with respect to the axis of the rotary shaft and the axis of the eccentric shaft as viewed in the axial direction of the rotary shaft; a swing transmission section that, as the bush balancer swings, a pressing section provided on the bush balancer presses a pressed section provided on the sub-balancer, thereby swinging the sub-balancer in a direction opposite to the swing direction of the bush balancer.

2. a sub-eccentric shaft that projects from a tip of the rotating shaft and extends parallel to the rotating shaft at a position eccentric with respect to the axis of the rotating shaft and the axis of the eccentric shaft, a sub-insertion hole into which the sub-eccentric shaft is inserted is formed in the sub-balancer, 2. The scroll compressor according to claim 1, wherein the sub-balancer is swingable about the sub-eccentric shaft.

3. the pressing portion is a protrusion provided on the bush, 3. The scroll compressor according to claim 1, wherein the pressed portion is a recess provided in the sub-balancer and into which the protrusion is inserted.

4. 4. The scroll compressor according to claim 3, wherein the recessed portion has an elongated hole shape.

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