Scroll Compressor

Abstract

To provide a scroll type compressor which is excellent in quietness while increasing the compression capacity of fluid, and capable of actualizing a lower manufacturing cost.SOLUTION: The scroll type compressor according to this invention includes a second scroll 11 having an end plate 11a, a spiral body 11b, and an adjustment part 63, the adjustment part 63 having a bottom face 63a, a peripheral face 63b, and a connection face 63c, the peripheral face 63b extending in the direction of a drive axis O while surrounding the bottom face 63a, the connection face 63c being located between the bottom face 63a and the peripheral face 63b for connecting the bottom face 63a and the peripheral face 63b, the peripheral face 63b having a first peripheral face 601 located on the outer periphery side of the end plate 11a, and a second peripheral face 602 located on the side of the drive axis O further than the first peripheral face 601. The length of the first peripheral face 601 in the direction of the drive axis O is smaller than the length of the second peripheral face 602 in the direction of the drive axis O.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a conventional scroll compressor. This scroll compressor includes a housing, a first scroll, and a second scroll. The first scroll is fixed within the housing. The second scroll is also provided within the housing. The second scroll rotates relative to the first scroll around the drive shaft, thereby forming a compression chamber between the second scroll and the first scroll to compress a fluid.

[0003] The second scroll also has an end plate, a spiral body, and an adjustment portion. The end plate extends in a circular plate shape perpendicular to the drive axis. The end plate has a first surface facing the first scroll and a second surface located opposite the first surface. The spiral body is integral with the end plate and protrudes spirally from the first surface toward the first scroll in the direction of the drive axis. The adjustment portion is formed on the end plate and is recessed from the second surface toward the first surface. In other words, the adjustment portion is located on the opposite side of the end plate from the spiral body. Note that multiple adjustment portions are formed on the end plate.

[0004] In this scroll compressor, the center of gravity of the second scroll can be adjusted by the adjustment unit to bring the center of gravity of the second scroll as close as possible to the drive shaft center, which allows the second scroll to rotate appropriately around the drive shaft center, thereby suppressing noise during operation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2018 / 003032 Summary of the Invention [Problem to be solved by the invention]

[0006] In this type of scroll compressor, an increase in the fluid compression capacity is required, so it is conceivable to increase the length of the volute in the drive shaft direction in the above-mentioned conventional scroll compressor, thereby increasing the size of the compression chamber formed between the volute and the first scroll.

[0007] However, if the scroll is lengthened in the axial direction, the center of gravity of the second scroll shifts from the axial direction, preventing the second scroll from rotating properly around the axial direction, resulting in increased noise during operation. Therefore, as the scroll is lengthened in the axial direction, it is necessary to adjust the center of gravity of the second scroll by forming an adjustment portion deeper relative to the end plate. The second scroll, including the adjustment portion, is generally formed by casting. Therefore, if the adjustment portion is formed deeper, the fluidity of the molten metal in the adjustment portion decreases, making it difficult to manufacture the adjustment portion and, ultimately, the second scroll. This reduces the manufacturing efficiency of the scroll compressor and increases manufacturing costs.

[0008] The present invention has been made in view of the above-described conventional circumstances, and an object to be achieved by the present invention is to provide a scroll compressor that can increase the fluid compression capacity while being quiet and capable of realizing low manufacturing costs. [Means for solving the problem]

[0009] The first scroll compressor of the present invention comprises a housing, a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and rotating relative to the first scroll about the drive axis to form a compression chamber for compressing a fluid between the first scroll and the second scroll, the second scroll includes an end plate that extends in a disk shape intersecting the drive shaft center and has a first surface facing the first scroll and a second surface positioned opposite to the first surface; a scroll that is integral with the end plate and that protrudes in a spiral shape from the first surface toward the first scroll in the drive shaft direction; an adjustment portion formed on the end plate, recessed from the second surface toward the first surface, for adjusting the center of gravity of the second scroll, The adjustment portion has a bottom surface parallel to the second surface, In the direction of the drive shaft while surrounding the bottom surface In a straight line an extending periphery; a connecting surface located between the bottom surface and the peripheral surface and connecting the bottom surface and the peripheral surface, The circumferential surface includes a first circumferential surface located on the outer circumferential side of the end plate, and a second circumferential surface located closer to the drive shaft center than the first circumferential surface and facing the first circumferential surface in the radial direction of the end plate. a third peripheral surface located between the first peripheral surface and the second peripheral surface and connecting the first peripheral surface and the second peripheral surface; and a fourth peripheral surface located between the first peripheral surface and the second peripheral surface while facing the third peripheral surface in the circumferential direction of the end plate, and connecting the first peripheral surface and the second peripheral surface. and the connecting surface has a first connecting portion connecting the bottom surface and the first peripheral surface, a second connecting portion connecting the bottom surface and the second peripheral surface, a third connecting portion connecting the bottom surface and the third peripheral surface, and a fourth connecting portion connecting the bottom surface and the fourth peripheral surface, The length of the first circumferential surface in the drive shaft direction is shorter than the length of the second circumferential surface in the drive shaft direction. Ku, The lengths of the third circumferential surface and the fourth circumferential surface in the drive axis direction gradually decrease from the length of the second circumferential surface in the drive axis direction to the length of the first circumferential surface in the drive axis direction from the second circumferential surface side toward the first circumferential surface side. It is characterized by:

[0010] In the first scroll compressor of the present invention, the circumferential surface of the adjustment portion has a first circumferential surface and a second circumferential surface, the first circumferential surface being located on the outer circumferential side of the end plate, while the second circumferential surface being located closer to the drive shaft than the first circumferential surface and facing the first circumferential surface in the radial direction of the end plate. The length of the first circumferential surface in the drive shaft direction is shorter than the length of the second circumferential surface in the drive shaft direction. This allows 、 In this scroll compressor, the adjustment portion is formed deep in accordance with the lengthening of the volute body toward the drive shaft, and even when the second scroll is formed by casting, the fluidity of the molten metal on the first circumferential surface can be increased. More specifically, in this scroll compressor, when the molten metal is circulated from the outer periphery of the end plate toward the drive shaft to form the second scroll, the molten metal can flow favorably on the first circumferential surface. Therefore, even when the adjustment portion is formed deep, the adjustment portion, including the first circumferential surface, can be favorably formed.

[0011] As a result, in this scroll compressor, the scroll body can be lengthened in the drive shaft direction to increase the size of the compression chamber, and the adjustment portion can be used to suitably adjust the center of gravity of the second scroll. Furthermore, in this scroll compressor, even if the adjustment portion is formed deep, manufacturing efficiency is not likely to decrease.

[0012] Therefore, the first scroll compressor of the present invention can increase the fluid compression capacity while providing excellent quietness and realizing low manufacturing costs.

[0013] In the first scroll compressor of the present invention, the connecting surface has a first connecting portion that connects the bottom surface and the first circumferential surface. attitude The first connection portion preferably has a bottom-side first connection portion that connects to the bottom surface and extends in a curved manner toward the first circumferential surface, a circumferential-side first connection portion that connects to the first circumferential surface and extends in a curved manner toward the bottom surface, and a first flat portion that is located between the bottom-side first connection portion and the circumferential-side first connection portion, extends flat, and connects to the bottom-side first connection portion and the circumferential-side first connection portion.

[0014] In this case, the length of the first peripheral surface in the drive shaft direction can be suitably shortened. Also, since the first connecting portion has the first flat portion, the fluidity of the molten metal in the first flat portion, and therefore the fluidity of the molten metal in the first connecting portion can be improved.

[0015] In the first scroll compressor of the present invention, a cross section of the end plate that passes through the first circumferential surface, the second circumferential surface, and the drive shaft and extends in the direction of the drive shaft may be set as a reference cross section. 。 It is also preferable that the first connection portion has an arc shape when viewed in the reference cross section. but The first connecting portion has an arc shape with a large radius of curvature. This also makes it possible to suitably shorten the length of the first peripheral surface in the drive shaft direction. In addition, the first connecting portion has an arc shape with a large radius of curvature, which makes it possible to increase the fluidity of the molten metal at the first connecting portion.

[0016] In the first scroll compressor of the present invention, the circumferential surface includes a third circumferential surface connecting the first circumferential surface and the second circumferential surface. a fourth peripheral surface that is located between the first peripheral surface and the second peripheral surface while facing the third peripheral surface in the circumferential direction of the end plate and connects the first peripheral surface and the second peripheral surface; have attitude And the third circumference The length of the fourth peripheral surface in the drive shaft direction is, from the second peripheral surface side to the first peripheral surface side, from the length of the second peripheral surface in the drive shaft direction to the length of the first peripheral surface in the drive shaft direction. Gradually shortening That's right R 。 this Therefore, Since the molten metal can flow more favorably on the first circumferential surface, the adjusting portion can be formed more favorably while being made deeper.

[0017] A second scroll compressor of the present invention includes a housing, a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and rotating relative to the first scroll about the drive axis to form a compression chamber for compressing a fluid between the first scroll and the second scroll, the second scroll includes an end plate that extends in a disk shape intersecting the drive shaft center and has a first surface facing the first scroll and a second surface positioned opposite to the first surface; a scroll that is integral with the end plate and that protrudes in a spiral shape from the first surface toward the first scroll in the drive shaft direction; an adjustment portion formed on the end plate, recessed from the second surface toward the first surface, for adjusting the center of gravity of the second scroll, The adjustment portion has a bottom surface parallel to the second surface, In the direction of the drive shaft while surrounding the bottom surface In a straight line an extending periphery; a connecting surface located between the bottom surface and the peripheral surface and connecting the bottom surface and the peripheral surface, The circumferential surface includes a first circumferential surface located on the outer circumferential side of the end plate, and a second circumferential surface located closer to the drive shaft center than the first circumferential surface and facing the first circumferential surface in the radial direction of the end plate. a third circumferential surface located between the first circumferential surface and the second circumferential surface and connecting the first circumferential surface and the second circumferential surface; and a fourth circumferential surface located between the first circumferential surface and the second circumferential surface and facing the third circumferential surface in the circumferential direction of the end plate, connecting the first circumferential surface and the second circumferential surface. and the connecting surface has a first connecting portion connecting the bottom surface and the first peripheral surface, a second connecting portion connecting the bottom surface and the second peripheral surface, a third connecting portion connecting the bottom surface and the third peripheral surface, and a fourth connecting portion connecting the bottom surface and the fourth peripheral surface, The length of the second circumferential surface in the drive shaft direction is shorter than the length of the first circumferential surface in the drive shaft direction. Ku, The lengths of the third circumferential surface and the fourth circumferential surface in the drive axis direction gradually decrease from the length of the first circumferential surface in the drive axis direction to the length of the second circumferential surface in the drive axis direction from the first circumferential surface side to the second circumferential surface side. It is characterized by:

[0018] In the second scroll compressor of the present invention, the length of the second circumferential surface in the drive shaft direction is shorter than the length of the first circumferential surface in the drive shaft direction. 、 In this scroll compressor, the adjustment portion is formed deep in accordance with the lengthening of the volute body toward the drive shaft center, and even when the second scroll is formed by casting, the fluidity of the molten metal on the second circumferential surface can be increased. More specifically, in this scroll compressor, when the second scroll is formed by flowing the molten metal from the drive shaft center side toward the outer periphery of the end plate, the molten metal can flow favorably on the second circumferential surface. Therefore, even when the adjustment portion is made deep, the adjustment portion, including the second circumferential surface, can be formed favorably.

[0019] As a result, even in this scroll compressor, the scroll body can be lengthened in the drive shaft direction to increase the size of the compression chamber, and the adjustment part can be used to suitably adjust the center of gravity of the second scroll. Furthermore, even in this scroll compressor, the manufacturing efficiency is not likely to decrease even if the adjustment part is designed to be deep.

[0020] Therefore, the second scroll compressor of the present invention can increase the fluid compression capacity while maintaining excellent quietness and achieving low manufacturing costs.

[0021] In the second scroll compressor of the present invention, the connecting surface has a second connecting portion that connects the bottom surface and the second circumferential surface. attitude The second connection portion preferably has a bottom-side second connection portion that connects to the bottom surface and extends in a curved manner toward the second circumferential surface, a circumferential-side second connection portion that connects to the second circumferential surface and extends in a curved manner toward the bottom surface, and a second flat portion that is located between the bottom-side second connection portion and the circumferential-side second connection portion, extends flat, and connects to the bottom-side second connection portion and the circumferential-side second connection portion.

[0022] In this case, the length of the second peripheral surface in the drive shaft direction can be suitably shortened. Also, since the second connecting portion has the second flat portion, the fluidity of the molten metal in the second flat portion, and therefore the fluidity of the molten metal in the second connecting portion can be improved.

[0023] In the second scroll compressor of the present invention, the cross section of the end plate, which is a plane that passes through the first circumferential surface, the second circumferential surface, and the drive shaft and extends in the direction of the drive shaft, can be set as the reference cross section. 。 It is also preferable that the second connection portion has an arc shape when viewed from the reference cross section. but The second connecting portion has an arc shape with a large radius of curvature. This also makes it possible to suitably shorten the length of the second peripheral surface in the drive shaft direction. In addition, the second connecting portion has an arc shape with a large radius of curvature, which makes it possible to increase the fluidity of the molten metal at the second connecting portion.

[0024] In the second scroll compressor of the present invention, the circumferential surface includes a third circumferential surface connecting the first circumferential surface and the second circumferential surface. a fourth peripheral surface that is located between the first peripheral surface and the second peripheral surface while facing the third peripheral surface in the circumferential direction of the end plate and connects the first peripheral surface and the second peripheral surface; have attitude And the third circumference The length of the fourth peripheral surface in the drive shaft direction is, from the first peripheral surface side to the second peripheral surface side, from the length of the first peripheral surface in the drive shaft direction to the length of the second peripheral surface in the drive shaft direction. Gradually shortening That's right R 。 this Therefore, Since the molten metal can flow more favorably on the second circumferential surface, the adjusting portion can be formed more favorably while being made deeper. [Effects of the Invention]

[0025] The first scroll compressor and the second scroll compressor of the present invention are excellent in quietness while increasing the fluid compression capacity, and can achieve low manufacturing costs. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a cross-sectional view of a scroll compressor according to a first embodiment. [Figure 2] FIG. 2 is a front view of the second scroll of the scroll compressor of the first embodiment, as viewed from the front. [Figure 3]FIG. 3 is a cross-sectional view of the scroll compressor of the first embodiment taken along the line AA in FIG. [Figure 4] 4 is an enlarged cross-sectional view of the main part of the scroll compressor of the first embodiment taken along the line AA in FIG. 2, showing the adjusting portion. [Figure 5] 5 is an enlarged cross-sectional view of the main part of the scroll compressor of the first embodiment taken along the line BB in FIG. 2, showing the adjusting portion. [Figure 6] 6 is an enlarged cross-sectional view of the main part of the scroll compressor of the first embodiment taken along the line CC in FIG. 2, showing the adjusting portion. [Figure 7] FIG. 7 is a schematic view showing a manufacturing process of the second scroll of the scroll compressor of the first embodiment. [Figure 8] FIG. 8 is a front view of the second scroll of the scroll compressor according to the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view of the scroll compressor of the second embodiment taken along the line DD in FIG. [Figure 10] 10 is an enlarged cross-sectional view of a main part of the scroll compressor of the second embodiment taken along the line DD in FIG. 8, showing the adjusting portion. [Figure 11] 11 is an enlarged cross-sectional view of a main part of the scroll compressor of the second embodiment taken along the line EE in FIG. 8, showing the adjusting portion. [Figure 12] 12 is an enlarged cross-sectional view of the main part of the scroll compressor of the second embodiment taken along the line FF in FIG. 8, showing the adjusting portion. [Figure 13] FIG. 13 is a schematic view showing a manufacturing process of the second scroll of the scroll compressor of the second embodiment. [Figure 14] FIG. 14 is an enlarged cross-sectional view of a main part of a scroll compressor according to a third embodiment, similar to FIG. 4, showing an adjustment section. [Figure 15] FIG. 15 is an enlarged cross-sectional view of a main part of a scroll compressor according to a fourth embodiment, similar to FIG. 10, showing an adjustment section. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, first to fourth embodiments of the present invention will be described with reference to the drawings. The scroll compressors (hereinafter simply referred to as compressors) of the first to fourth embodiments are mounted on a vehicle (not shown) and form a refrigeration circuit of the vehicle.

[0028] Example 1 As shown in Fig. 1, the compressor of the first embodiment includes a housing 1, a drive shaft 5, an electric motor 7, a fixed scroll 9, and a movable scroll 11. The fixed scroll 9 is an example of the "first scroll" in the present invention. The movable scroll 11 is an example of the "second scroll" in the present invention.

[0029] In this embodiment, the front-to-rear direction of the compressor is defined by the solid arrow shown in Fig. 1. In Fig. 3 and subsequent figures, the front-to-rear direction of the compressor is defined in accordance with Fig. 1. Note that this front-to-rear direction is an example provided for convenience of explanation, and the position of the compressor is changed as appropriate depending on the vehicle in which it is installed, etc.

[0030] 1, the housing 1 is made up of a motor housing 13, a compressor housing 14, and a fixed block 15. The motor housing 13 forms the front portion of the housing 1, and the compressor housing 14 forms the rear portion of the housing 1.

[0031] The motor housing 13 has a front wall 13a and a first peripheral wall 13b. The front wall 13a is located at the front end of the motor housing 13 and extends radially of the motor housing 13. The first peripheral wall 13b is connected to the front wall 13a and extends rearward from the front wall 13a. The front wall 13a and the first peripheral wall 13b give the motor housing 13 a cylindrical shape with a bottom and an open rearward end. A suction chamber 17 is formed within the motor housing 13.

[0032] The motor housing 13 is also formed with a suction opening 13c and a support portion 13d. The suction opening 13c is formed in the first peripheral wall 13b and communicates with the suction chamber 17. The suction opening 13c is connected to an evaporator (not shown) by a pipe (not shown), and allows the refrigerant gas that has passed through the evaporator to be drawn into the suction chamber 17. The refrigerant gas is an example of the "fluid" in the present invention.

[0033] Support portion 13d protrudes from front wall 13a into suction chamber 17. Support portion 13d is cylindrical and has first radial bearing 19 provided therein. Note that suction opening 13c may be formed in front wall 13a.

[0034] The compressor housing 14 has a rear wall 14a and a second peripheral wall 14b. The rear wall 14a is located at the rear end of the compressor housing 14 and extends in the radial direction of the compressor housing 14. The second peripheral wall 14b is connected to the rear wall 14a and extends forward from the rear wall 14a. The rear wall 14a and the second peripheral wall 14b form the compressor housing 14 in a cylindrical shape with a bottom and an open front.

[0035] The compressor housing 14 is formed with an oil separation chamber 14c, a first discharge recess 14d, a discharge passage 14e, and a discharge opening 14f. The oil separation chamber 14c is located rearward within the compressor housing 14 and extends radially of the compressor housing 14. The first discharge recess 14d is located forward of the oil separation chamber 14c within the compressor housing 14 and is recessed toward the oil separation chamber 14c. The discharge passage 14e extends in the front-to-rear direction and connects the oil separation chamber 14c and the first discharge recess 14d. The discharge opening 14f is connected to the upper end of the oil separation chamber 14c and opens toward the outside of the compressor housing 14. The discharge opening 14f is connected to a condenser (not shown) by piping.

[0036] A separation cylinder 21 is fixed inside the oil separation chamber 14c. The separation cylinder 21 has a cylindrical outer peripheral surface 21a. The outer peripheral surface 21a is coaxial with an inner peripheral surface 140 of the oil separation chamber 14c. The outer peripheral surface 21a and the inner peripheral surface 140 form a separator. A filter 23 is provided below the separation cylinder 21 inside the oil separation chamber 14c.

[0037] The fixed block 15 is provided between the motor housing 13 and the compressor housing 14. The motor housing 13, the compressor housing 14, and the fixed block 15 are fastened together from the compressor housing 14 side by a plurality of bolts 25. In this way, the fixed block 15 is sandwiched between the motor housing 13 and the compressor housing 14 and fixed to them. As a result, the fixed block 15 is positioned between the suction chamber 17 and the movable scroll 11 in the front-to-rear direction. Note that FIG. 1 shows only one of the plurality of bolts 25. The method of fixing the motor housing 13, the compressor housing 14, and the fixed block 15 can be designed as appropriate.

[0038] The fixed block 15 is formed with a boss 15a that protrudes forward. An insertion hole 15b is formed at the tip of the boss 15a. A second radial bearing 27 and a seal member 29 are provided inside the boss 15a. The fixed block 15 is also formed with an intake passage 55. The intake passage 55 is located outside the boss 15a in the fixed block 15 and passes through the fixed block 15 in the front-rear direction. The number of intake passages 55 can be designed as needed.

[0039] Additionally, a plurality of rotation prevention pins 31 are fixed to the fixed block 15. Each of the rotation prevention pins 31 extends rearward from the fixed block 15. Note that FIG. 1 illustrates only one of the plurality of rotation prevention pins 31.

[0040] The drive shaft 5 is provided in the housing 1. The drive shaft 5 has a cylindrical shape extending in the front-rear direction. The drive shaft 5 is composed of a small diameter section 5a, a large diameter section 5b, and a tapered section 5c. The small diameter section 5a is located at the front end of the drive shaft 5. The large diameter section 5b is located rearward of the small diameter section 5a and has a larger diameter than the small diameter section 5a. A flat rear end surface 5d is formed at the rear end of the large diameter section 5b. The tapered section 5c is located between the small diameter section 5a and the large diameter section 5b. The tapered section 5c is connected to the small diameter section 5a at its front end. The tapered section 5c increases in diameter toward the rear and is connected to the large diameter section 5b at its rear end.

[0041] The drive shaft 5 has a small diameter portion 5a rotatably supported by a support portion 13d of the motor housing 13 via a first radial bearing 19. The rear end of the large diameter portion 5b is inserted into an insertion hole 15b of the fixed block 15 and enters the boss 15a. Inside the boss 15a, the rear end of the large diameter portion 5b is rotatably supported by a second radial bearing 27. In this way, the drive shaft 5 is rotatable around a rotation axis X within the housing 1. The rotation axis X extends parallel to the front-to-rear direction of the compressor. A seal member 29 seals the gap between the fixed block 15 and the drive shaft 5.

[0042] An eccentric pin 50 is fixed to the large diameter portion 5b of the drive shaft 5. The eccentric pin 50 is disposed at a position eccentric from the rotation axis X on the rear end surface 5d. The eccentric pin 50 is formed in a cylindrical shape with a smaller diameter than the drive shaft 5 and extends rearward from the rear end surface 5d. The axis of the eccentric pin 50 is the drive axis O. As described above, since the eccentric pin 50 is disposed at a position eccentric from the rotation axis X, the drive axis O is also disposed at a position eccentric from the rotation axis X. The drive axis O extends in the front-rear direction parallel to the rotation axis X. The rear end side of the large diameter portion 5b of the eccentric pin 50 is inserted into the boss 15a, and the eccentric pin 50 is fitted into a bushing 50a inside the boss 15a.

[0043] Furthermore, a balance weight 33 is integrally formed on the large diameter portion 5b of the drive shaft 5. The balance weight 33 is disposed on the large diameter portion 5b at a position eccentric from the rotation axis X. More specifically, the balance weight 33 is disposed on the opposite side of the rotation axis X from the eccentric pin 50.

[0044] Although detailed illustration is omitted, the balance weight 33 is formed in a generally fan-shaped plate shape. The balance weight 33 extends in the radial direction of the drive shaft 5, away from the large diameter portion 5b. The radial direction of the drive shaft 5 is perpendicular to the front-to-rear direction. In other words, the balance weight 33 extends from the large diameter portion 5b toward the first peripheral wall 13b of the motor housing 13. The drive shaft 5 is disposed within the housing 1, and the balance weight 33 is therefore located within the suction chamber 17. More specifically, the balance weight 33 is located within the suction chamber 17, between the fixed block 15 and the electric motor 7. The shape of the balance weight 33 can be designed as appropriate.

[0045] The electric motor 7 is housed in the suction chamber 17. As a result, the suction chamber 17 also serves as a motor chamber that houses the electric motor 7. The electric motor 7 is located in the suction chamber 17 forward of the balance weight 33.

[0046] The electric motor 7 has a stator 7a and a rotor 7b. The stator 7a is fixed to the inner circumferential surface of the first circumferential wall 13b. The stator 7a is connected to an inverter (not shown) provided outside the motor housing 13.

[0047] The stator 7a has a stator core 22 and coil ends 24. The stator core 22 is formed in a cylindrical shape. A coil 26 is wound around the stator core 22. The coil ends 24 are annular and protrude forward and backward in the axial direction from the stator core 22. The coil ends 24 are formed by a part of the coils 26. The rear ends of the coil ends 24 are inclined on the inner circumferential side to avoid interference with the balance weight 33.

[0048] The rotor 7b is disposed within the stator 7a. The large diameter portion 5b of the drive shaft 5 is press-fitted into the rotor 7b, thereby fixing the drive shaft 5 to the rotor 7b. The rotor 7b rotates within the stator 7a, causing the drive shaft 5 to rotate around the rotation axis X.

[0049] The fixed scroll 9 is fixed to the compressor housing 14 and disposed within the compressor housing 14. The fixed scroll 9 has a fixed end plate 9a, a fixed peripheral wall 9b, and a fixed scroll body 9c. The fixed end plate 9a is located at the rear end of the fixed scroll 9 and is formed in a disk shape extending in the radial direction of the drive shaft 5. The fixed end plate 9a is formed with a front surface 901 and a rear surface 902, as well as a second discharge recess 9d and a discharge port 9e. The front surface 901 faces the front side, i.e., toward the movable scroll 11. The rear surface 902 is located opposite the front surface 901 and faces the rear side.

[0050] The second discharge recess 9d is recessed forward from the rear surface 902. The fixed scroll 9 is fixed to the compressor housing 14, so that the second discharge recess 9d faces the first discharge recess 14d. Thus, the first discharge recess 14d and the second discharge recess 9d form a discharge chamber 35. The discharge chamber 35 communicates with the oil separation chamber 14c through a discharge passage 14e. The discharge port 9e penetrates the fixed end plate 9a in the front-rear direction and communicates with the discharge chamber 35.

[0051] A discharge reed valve 39 and a retainer 41 are attached to the fixed end plate 9a by a pin 37. The pin 37, discharge reed valve 39, and retainer 41 are disposed within the discharge chamber 35. The discharge reed valve 39 opens and closes the discharge port 9e by elastically deforming. The retainer 41 adjusts the amount of elastic deformation of the discharge reed valve 39.

[0052] The fixed peripheral wall 9b is connected to the fixed end plate 9a at the outer periphery of the fixed end plate 9a and extends cylindrically forward, i.e., toward the movable scroll 11. An intake port 9f is formed in the fixed peripheral wall 9b. The intake port 9f radially penetrates the fixed peripheral wall 9b. As a result, the intake port 9f opens into the compressor housing 14. The fixed scroll 9c is formed on a front surface 901 of the fixed end plate 9a and is integral with the fixed peripheral wall 9b on the inside thereof. The fixed scroll 9c protrudes in a spiral shape from the front surface 901 in the direction of the drive axis O toward the movable scroll 11.

[0053] An oil supply passage 43 is formed in the fixed scroll 9. The oil supply passage 43 penetrates through the fixed end plate 9a and the fixed peripheral wall 9b. As a result, the rear end of the oil supply passage 43 opens at the rear surface 902 of the fixed end plate 9a, and the front end of the oil supply passage 43 opens at the front end surface of the fixed peripheral wall 9b. The oil supply passage 43 communicates with the oil separation chamber 14c via the filter 23. The shape of the oil supply passage 43 can be designed as appropriate.

[0054] The movable scroll 11 is provided in a compressor housing 14 and is located between the fixed scroll 9 and a fixed block 15. The movable scroll 11 has a movable end plate 11a and a movable spiral body 11b. The movable end plate 11a is an example of the "end plate" in the present invention, and the movable spiral body 11b is an example of the "spiral body" in the present invention.

[0055] As shown in FIGS. 2 and 3 , the movable end plate 11a is located at the front end of the movable scroll 11 and has a disk-like shape extending in the radial direction of the drive shaft 5. In other words, the movable end plate 11a extends in a disk-like shape perpendicular to the rotation axis X and the drive axis O. The movable end plate 11a has a rear surface 111, a front surface 112, and an outer peripheral surface 113. The rear surface 111 is an example of a “first surface” in the present invention, and the front surface 112 is an example of a “second surface” in the present invention. The rear surface 111 faces the rear side, i.e., toward the fixed scroll 9. The front surface 112 is located opposite the rear surface 111 and faces the forward side. The outer peripheral surface 113 is located between the rear surface 111 and the front surface 112. The outer peripheral surface 113 extends parallel to the rotation axis X and the drive axis O, wraps around the movable end plate 11a in the circumferential direction, and is continuous with the rear surface 111 and the front surface 112. As a result, the outer peripheral surface 113 forms the outer edge portion of the movable end plate 11a.

[0056] The movable end plate 11a is formed with a holding portion 61, three first adjustment portions 63, and six accommodation portions 65. Each of the first adjustment portions 63 is an example of the "adjustment portion" in the present invention.

[0057] The retaining portion 61 is disposed in the center of the movable end plate 11a, i.e., on the drive axis O side of the movable end plate 11a, and protrudes forward in a cylindrical shape from the front surface 112. As shown in Fig. 1, a bushing 50a is rotatably supported within the retaining portion 61 via a third radial bearing 45. As a result, the movable scroll 11 is connected to the drive shaft 5 via the bushing 50a and the eccentric pin 50 at a position eccentric from the rotation axis X.

[0058] As shown in FIG. 2, all of the first adjustment portions 63 have the same configuration and are arranged in the circumferential direction of the movable end plate 11a. Each first adjustment portion 63 is recessed in a substantially rectangular shape from the front surface 112 toward the rear surface 111. More specifically, each first adjustment portion 63 has a rectangular shape that extends longer in the circumferential direction of the movable end plate 11a at the portion closest to the outer circumferential surface 113 than at the portion closest to the drive axis O. In other words, each first adjustment portion 63 has a rectangular shape that extends longer in the circumferential direction of the movable end plate 11a at the portion closest to the outer circumferential surface 113 in the radial direction of the movable end plate 11a than at the portion closest to the drive axis O.

[0059] Each first adjustment portion 63 is composed of a bottom surface 63a, a peripheral surface 63b, and a connecting surface 63c. The bottom surface 63a extends radially from the outer periphery of the movable end plate 11a toward the drive axis O, and also extends circumferentially of the movable end plate 11a, forming a substantially rectangular planar shape. Thus, the bottom surface 63a forms a plane parallel to the second surface 112. The bottom surface 63a is located closest to the rear surface 111 of the first adjustment portion 63, and forms the bottom of the first adjustment portion 63. Furthermore, the portion of the bottom surface 63a on the outer periphery of the movable end plate 11a extends longer in the circumferential direction of the movable end plate 11a than the portion on the drive axis O side.

[0060] The peripheral surface 63b goes around the bottom surface 63a and surrounds the bottom surface 63a. As shown in Fig. 3, the peripheral surface 63b extends away from the bottom surface 63a in the direction of the drive axis O. In other words, the peripheral surface 63b extends forward from the bottom surface 63a toward the front surface 112.

[0061] As shown in Fig. 2, the circumferential surface 63b is made up of a first circumferential surface 601, a second circumferential surface 602, a third circumferential surface 603, and a fourth circumferential surface 604. The first circumferential surface 601 is located on the circumferential surface 63b closest to the outer periphery of the movable end plate 11a, i.e., on the outer circumferential surface 113 side. The second circumferential surface 602 is located on the circumferential surface 63b closest to the drive axis O. The second circumferential surface 602 faces the first circumferential surface 601 in the radial direction of the movable end plate 11a.

[0062] The third circumferential surface 603 is located on the circumferential surface 63b between the first circumferential surface 601 and the second circumferential surface 602 and is connected to the first circumferential surface 601 and the second circumferential surface 602. The fourth circumferential surface 604 is located on the circumferential surface 63b opposite the third circumferential surface 603 in the circumferential direction of the movable end plate 11a and is located between the first circumferential surface 601 and the second circumferential surface 602. The fourth circumferential surface 604 is connected to the first circumferential surface 601 and the second circumferential surface 602.

[0063] In the circumferential surface 63b, the first circumferential surface 601 extends longer in the circumferential direction of the movable end plate 11a than the second circumferential surface 602. In addition, the third circumferential surface 603 and the fourth circumferential surface 604 extend closer to each other in the circumferential direction of the movable end plate 11a from the first circumferential surface 601 side toward the second circumferential surface 602 side.

[0064] The connecting surface 63c is located between the bottom surface 63a and the peripheral surface 63b and connects the bottom surface 63a and the peripheral surface 63b. The connecting surface 63c is made up of a first connecting portion 611, a second connecting portion 612, a third connecting portion 613, and a fourth connecting portion 614.

[0065] As shown in Figures 4 and 5, the first connection portion 611 is located between the bottom surface 63a and the first circumferential surface 601. As shown in Figures 4 and 6, the second connection portion 612 is located between the bottom surface 63a and the second circumferential surface 602. As shown in Figure 2, the third connection portion 613 is located between the bottom surface 63a and the third circumferential surface 603. The fourth connection portion 614 is located between the bottom surface 63a and the fourth circumferential surface 604. On the connection surface 63c, the first connection portion 611 is located at a position closest to the outer periphery of the movable end plate 11a, and the second connection portion 612 is located at a position closest to the drive axis O.

[0066] As shown in FIGS. 4 and 5, the first connection portion 611 includes a bottom-side first connection portion 611a, a peripheral-side first connection portion 611b, and a first flat portion 611c. The bottom-side first connection portion 611a connects to the bottom surface 63a and extends in a curved manner toward the first peripheral surface 601. The peripheral-side first connection portion 611b connects to the first peripheral surface 601 and extends in a curved manner toward the bottom surface 63a. The first flat portion 611c is located between the bottom-side first connection portion 611a and the peripheral-side first connection portion 611b. The first flat portion 611c extends flat and connects to the bottom-side first connection portion 611a and the peripheral-side first connection portion 611b.

[0067] The first connecting portion 611, consisting of the bottom surface-side first connecting portion 611a, the peripheral surface-side first connecting portion 611b, and the first flat portion 611c, has a shape that slopes upward from the bottom surface 63a toward the first peripheral surface 601 as a whole, and connects the bottom surface 63a and the first peripheral surface 601. In other words, when the first adjustment portion 63 is viewed in the AA cross section, the first connecting portion 611 has a chamfered shape where it connects the bottom surface 63a and the first peripheral surface 601. The AA cross section is an example of a reference cross section in the present invention.

[0068] 4 and 6, the second connecting portion 612 does not have a bottom surface-side first connecting portion 611a, a peripheral surface-side first connecting portion 611b, or a first flat portion 611c, unlike the first connecting portion 611. As a result, the second connecting portion 612 has an arc-shaped curve with a predetermined radius of curvature when viewed in the AA cross section, as shown in FIG.

[0069] 2 are symmetrical in the circumferential direction of the movable end plate 11a. The third connecting portion 613 connects the bottom surface 63a and the third circumferential surface 603 while curving in an arc, and the fourth connecting portion 614 connects the bottom surface 63a and the fourth circumferential surface 604 while curving in an arc. Furthermore, the third connecting portion 613 and the fourth connecting portion 614 are located between the first connecting portion 611 and the second connecting portion 612 in the radial direction of the movable end plate 11a. As a result, the third connecting portion 613 and the fourth connecting portion 614 are connected to the first connecting portion 611 and the second connecting portion 612, respectively.

[0070] 4, in the AA cross section, a first imaginary line Y1 extending linearly from the bottom surface 63a toward the outer periphery of the movable end plate 11a, a second imaginary line Y2 extending linearly from the first circumferential surface 601 toward the first imaginary line Y1, and a first imaginary arc R1 forming an arc equal to the second connection portion 612 are imaginary. The first imaginary arc R1 is tangent to the first imaginary line Y1 and the second imaginary line Y2 and is disposed between the bottom surface 63a and the first circumferential surface 601. As a result, the first connection portion 611, more specifically, the bottom surface-side first connection portion 611a, the circumferential surface-side first connection portion 611b, and the first flat portion 611c are located on the opposite side of the first imaginary arc R1 from the intersection M1 of the first imaginary line Y1 and the second imaginary line Y2.

[0071] As a result, the bottom surface 63a and the second circumferential surface 602 are connected in an arc shape by the second connecting portion 612, while the bottom surface 63a and the first circumferential surface 601 are connected more gently by the first connecting portion 611. Although not shown in detail, the first connecting portion 611 has a shape that is gentler than the third connecting portion 613 and the fourth connecting portion 614.

[0072] In this way, the second connecting portion 612 connects the bottom surface 63a and the second circumferential surface 602 in an arc shape, while the first connecting portion 611 connects the bottom surface 63a and the first circumferential surface 601 more gently, so that the first circumferential surface 601 extends a shorter distance in the direction of the drive axis O than the second circumferential surface 602. Specifically, the second circumferential surface 602 extends from the bottom surface 63a toward the front surface 112 by a second length L12, while the first circumferential surface 601 extends from the bottom surface 63a toward the front surface 112 by a first length L11 that is shorter than the second length L12.

[0073] As described above, the third circumferential surface 603 is connected to the first circumferential surface 601 and the second circumferential surface 602. Furthermore, the third connecting portion 613 is connected to the first connecting portion 611 and the second connecting portion 612, and therefore the first connecting portion 611 side of the third connecting portion 613 connects the bottom surface 63a and the third circumferential surface 603 more loosely than the second connecting portion 612 side. For these reasons, the third circumferential surface 603 extends a first length L11 from the bottom surface 63a toward the front surface 112 at the portion where it connects with the first circumferential surface 601, whereas the third circumferential surface 603 extends a second length L12 from the bottom surface 63a toward the front surface 112 at the portion where it connects with the second circumferential surface 602. That is, the length of the third circumferential surface 603 in the direction of the drive axis O gradually decreases from the second length L12 to the second length L12 from the second circumferential surface 602 side toward the first circumferential surface 601 side. Although not shown, the length of the fourth circumferential surface 604 in the direction of the drive axis O also gradually decreases from the second length L12 to the first length L11 from the second circumferential surface 602 side toward the first circumferential surface 601 side. The shapes of the third circumferential surface 603, the fourth circumferential surface 604, the third connecting portion 613, and the fourth connecting portion 614 can be designed as appropriate.

[0074] 2, all of the accommodation sections 65 have the same configuration and are arranged in the circumferential direction of the movable end plate 11a. Each accommodation section 65 is recessed in a substantially cylindrical shape from the front surface 112 to the rear surface 111. The number of first adjustment sections 63 and accommodation sections 65 formed on the movable end plate 11a can be designed as appropriate.

[0075] As shown in Fig. 3, the movable scroll 11b is integrally formed with the rear surface 111 of the movable end plate 11a. The movable scroll 11b protrudes in a spiral shape rearward from the rear surface 111, i.e., in the directions of the rotation axis X and the drive axis O, toward the fixed scroll 9. As shown in Fig. 1, an air supply hole 11d is formed near the center of the movable scroll 11b. The air supply hole 11d opens at the front end of the movable scroll 11b and extends in the front-rear direction within the movable scroll 11b to the movable end plate 11a. For ease of explanation, the air supply hole 11d is not shown in Figs. 2 and 3. The same applies to Figs. 8 and 9, which will be described later.

[0076] 7 is first performed to prepare a first molding die 81 and a second molding die 83. A first molding surface 81a is formed on the first molding die 81, and a second molding surface 83a is formed on the second molding die 83. Then, the first molding die 81 and the second molding die 83 are clamped together with the first molding surface 81a and the second molding surface 83a facing each other, whereby a first cavity 85 is formed by the first molding surface 81a and the second molding surface 83a.

[0077] Here, the second forming surface 83a is provided with a holding portion forming portion 831 for forming the holding portion 61, a first adjustment portion forming portion 832 for forming each first adjustment portion 63, and a storage portion forming portion 833 for forming each storage portion 65.

[0078] A first pouring gate 87 is formed in the first molding die 81. The first pouring gate 87 is connected to the first cavity 85. In this case, the first pouring gate 87 is connected to a portion of the first cavity 85 that will become the outer peripheral surface 113 of the movable end plate 11a, i.e., a portion on the outer peripheral side of the movable end plate 11a. The first pouring gate 87 may also be formed in the second molding die 83 and connected to a portion on the outer peripheral side of the movable end plate 11a.

[0079] Next, the casting process is performed. In the casting process, as shown by the solid arrow in Fig. 7, molten metal is supplied from the first pouring gate 87 and filled into the first cavity 85 through the first pouring gate 87. At this time, the molten metal is filled into the first cavity 85 while being appropriately pressurized by a plunger (not shown). In addition, the molten metal filled into the first cavity 85 is locally pressurized by a squeeze pin (not shown).

[0080] Here, the first pouring gate 87 is connected to a portion of the first cavity 85 that is on the outer periphery of the movable end plate 11a. Therefore, the molten metal supplied from the first pouring gate 87 flows through the first cavity 85 from the portion on the outer periphery of the movable end plate 11a toward the drive shaft center O, that is, toward the center of the movable end plate 11a. Then, when the first cavity 85 is filled with the molten metal, the filling of the molten metal is completed and the casting process ends.

[0081] Next, the finishing process is carried out. In the finishing process, the molten metal is solidified in the first cavity 85 to form an intermediate body (not shown) of the movable scroll 11. The intermediate body is then removed from the first cavity 85, and further subjected to finishing processes such as polishing, thereby completing the movable scroll 11. In this way, the finishing process is completed.

[0082] As described above, in the first embodiment, by casting the movable scroll 11, not only the movable end plate 11a and the movable spiral body 11b but also the retaining portion 61, each of the first adjustment portions 63, and each of the accommodation portions 65 are simultaneously and integrally formed with the movable end plate 11a. That is, in each of the first adjustment portions 63 formed by casting, as described above, the length of the first circumferential surface 601 in the direction of the drive axis O is shorter than the length of the second circumferential surface 602 in the direction of the drive axis O, the first connecting portion 611 has a gentler shape than the second connecting portion 612, and the lengths of the third circumferential surface 603 and the fourth circumferential surface 604 in the direction of the drive axis O gradually decrease from the second circumferential surface 602 side toward the first circumferential surface 601 side. Note that, although detailed description and illustration are omitted, the fixed scroll 9 is also formed by casting.

[0083] 1, the fixed scroll 9 has a fixed spiral body 9c and a movable scroll 11b meshed with each other in the compressor housing 14. As a result, a compression chamber 49 is formed between the fixed scroll 9 and the movable scroll 11 by the fixed end plate 9a, the fixed spiral body 9c, the movable end plate 11a, and the movable spiral body 11b. The compression chamber 49 is in communication with the discharge port 9e.

[0084] A thrust plate 51 is provided between the fixed scroll 9, the movable scroll 11, and the fixed block 15. The fixed scroll 9 and the movable scroll 11 are in contact with the fixed block 15 via the thrust plate 51. The thrust plate 51 is made of a thin metal plate.

[0085] Furthermore, a back pressure chamber 53 is formed in the boss 15a of the fixed block 15 by the movable end plate 11a and the thrust plate 51. The back pressure chamber 53 communicates with the air supply hole 11d.

[0086] In addition, in the movable scroll 11, a cylindrical ring 47 is housed in each housing portion 65 of the movable end plate 11a. The tip of each rotation-preventing pin 31 is inserted into each ring 47, thereby connecting each ring 47 to each rotation-preventing pin 31. These rotation-preventing pins 31 and rings 47 constitute a rotation-preventing mechanism 16. In this way, the fixed block 15, thrust plate 51, and movable scroll 11 are connected by the rotation-preventing mechanism 16.

[0087] In this compressor, the electric motor 7 is operated under the control of an inverter, causing the drive shaft 5 to rotate about the rotation axis X, thereby rotating the movable scroll 11. At this time, the rotation prevention mechanism 16 restricts the rotation of the movable scroll 11, and the movable scroll 11 only revolves about the drive axis O, which is eccentric with respect to the rotation axis X. In other words, the movable scroll 11 rotates relative to the fixed scroll 9 about the drive axis O. As a result, the movable end plate 11a slides over the tip of the fixed scroll 9c, and the movable scroll 11b slides against the fixed scroll 9c. As a result, refrigerant gas in the suction chamber 17 flows through the suction passage 55 to the suction port 9f and is drawn into the compression chamber 49 from the suction port 9f. The volume of the compression chamber 49 decreases as the movable scroll 11 rotates, compressing the refrigerant gas therein.

[0088] The high-pressure refrigerant gas compressed in the compression chamber 49 is discharged from the discharge port 9e into the discharge chamber 35, and then flows from the discharge chamber 35 through the discharge passage 14e to the oil separation chamber 14c. The high-pressure refrigerant gas then flows through the separation cylinder 21, separating the lubricating oil as it circulates between the outer circumferential surface 21a of the separation cylinder 21 and the inner circumferential surface 140 of the oil separation chamber 14c, and is then discharged from the discharge opening 14f.

[0089] Meanwhile, the lubricating oil separated from the refrigerant gas is stored in the oil separation chamber 14c. This lubricating oil then passes through the filter 23 and flows through the oil supply passage 43, where it is supplied to the sliding portions between the fixed scroll 9 and the movable scroll 11, lubricating the sliding portions between the fixed scroll 9 and the movable scroll 11. The lubricating oil flowing through the oil supply passage 43 is also supplied to the space between the second radial bearing 27 and the drive shaft 5, as well as to the suction chamber 17, etc.

[0090] Furthermore, a portion of the high-pressure refrigerant gas compressed in the compression chamber 49 flows through the air inlet 11d and is supplied into the back pressure chamber 53. This increases the pressure in the back pressure chamber 53. As a result, the movable scroll 11 is urged toward the compression chamber 49 by the pressure in the back pressure chamber 53 via the thrust plate 51. The movable scroll 11 is also urged toward the compression chamber 49 by the elastic force of the thrust plate 51.

[0091] In this compressor, in order to increase the size of the compression chamber 49, the fixed scroll 9c and the movable scroll 11b are each formed longer in the direction of the drive axis O compared to conventional compressors. Accordingly, in order to adjust the center of gravity of the movable scroll 11, the first adjustment portions 63 are formed deeper relative to the movable end plate 11a.

[0092] In this compressor, when forming the movable scroll 11 by casting, the molten metal is caused to flow from a portion of the first cavity 85 that is on the outer periphery of the movable end plate 11a toward the drive axis O. In other words, the first circumferential surface 601 is located upstream of the second circumferential surface 602 in the direction of flow of the molten metal, and the first connecting portion 611 is located upstream of the second connecting portion 612 in the direction of flow of the molten metal.

[0093] Furthermore, in this compressor, the connection surface 63c of each first adjustment portion 63 has first to fourth connection portions 611 to 614. Here, the first connection portion 611 connects the first circumferential surface 601 of the circumferential surface 63b to the bottom surface 63a, and is therefore located closest to the outer periphery of the movable end plate 11a on the connection surface 63c. On the other hand, the second connection portion 612 connects the second circumferential surface 602 of the circumferential surface 63b to the bottom surface 63a, and is therefore located closest to the drive shaft center O on the connection surface 63c. As described above, the first connection portion 611 is located on the opposite side of the first imaginary arc R1 from the intersection M1 of the first imaginary line Y1 and the second imaginary line Y2, and connects the bottom surface 63a to the first circumferential surface 601 with a shape that is gentler than the arc-shaped second connection portion 612.

[0094] The second peripheral surface 602 extends from the bottom surface 63a toward the front surface 112 by a second length L12, whereas the first peripheral surface 601 extends from the bottom surface 63a toward the front surface 112 by a first length L11 that is shorter than the second length L12.

[0095] For these reasons, in this compressor, when forming the movable scroll 11, the fluidity of the molten metal is high at the first circumferential surface 601 and the first connecting portion 611, as indicated by the dashed arrows in Fig. 5. In other words, the molten metal flows favorably at the locations within the first cavity 85 where the first circumferential surface 601 and the first connecting portion 611 are formed. For this reason, in this compressor, even when the first adjustment portions 63 are made deeper, it is possible to favorably form the first adjustment portions 63, including the first circumferential surface 601 and the first connecting portion 611.

[0096] As a result, in this compressor, the fixed scroll 9c and the movable scroll 11b can be lengthened in the direction of the drive axis O to increase the size of the compression chamber 49, and the center of gravity of the movable scroll 11 can be suitably adjusted by each first adjustment portion 63. Furthermore, in this compressor, the fluidity of the molten metal can be increased at the first circumferential surface 601 and the first connection portion 611, so that manufacturing efficiency is unlikely to decrease even if each first adjustment portion 63 is formed deep.

[0097] Therefore, the compressor of the first embodiment can increase the compression capacity of the refrigerant gas while being quiet and achieving low manufacturing costs.

[0098] In particular, in this compressor, the first connection portion 611 is made up of a bottom surface-side first connection portion 611a, a peripheral surface-side first connection portion 611b, and a first flat portion 611c. As a result, when the first adjustment portion 63 is viewed in the AA cross section, the first connection portion 611, which is the portion connecting the bottom surface 63a and the first peripheral surface 601, has a chamfered shape. Furthermore, in the first connection portion 611, the first flat portion 611c makes it possible to sufficiently increase the fluidity of the molten metal.

[0099] Furthermore, in this compressor, the lengths of the third circumferential surface 603 and the third circumferential surface 604 of the circumferential surface 63b in the direction of the drive axis O gradually decrease from the second circumferential surface 602 side toward the second circumferential surface 601 side. This also increases the fluidity of the molten metal at the first circumferential surface 601 and the first connecting portion 611.

[0100] Furthermore, in this compressor, when forming each first adjustment portion 63, a portion required to ensure the fluidity of the molten metal at the connection surface 63c, i.e., the first connection portion 611, is given a gentle shape, eliminating the need to give all of the first to fourth connection portions 611 to 614 a gentle shape like the first connection portion 611. This increases manufacturing efficiency as described above while also increasing the degree of freedom in designing the connection surface 63c and, ultimately, the degree of freedom in designing each first adjustment portion 63. Therefore, the shape of each first adjustment portion 63 can be made suitable for adjusting the center of gravity of the orbiting scroll 11. As a result, the center of gravity of the orbiting scroll 11 can be suitably adjusted by each first adjustment portion 63, and the center of gravity of the orbiting scroll 11 can be suitably brought closer to the drive axis O.

[0101] Example 2 The compressor of the second embodiment is provided with a movable scroll 12 shown in Figures 8 and 9 instead of the movable scroll 11. The movable scroll 12 is also an example of the "second scroll" in the present invention.

[0102] The movable scroll 12 has a movable end plate 12a and a movable spiral body 12b. The movable end plate 12a is also an example of the "end plate" of the present invention, and the movable spiral body 12b is also an example of the "spiral body" of the present invention. The movable end plate 12a is located at the front end of the movable scroll 12 and is formed in a disk shape extending in the radial direction of the drive shaft 5. The movable end plate 12a is formed with a rear surface 121, a front surface 122, and an outer peripheral surface 123. The rear surface 121 is also an example of the "first surface" of the present invention, and the front surface 122 is also an example of the "second surface" of the present invention. The rear surface 121 faces the fixed scroll 9. The front surface 122 is located opposite the rear surface 121 and faces forward. The outer peripheral surface 123 is located between the rear surface 121 and the front surface 122. The outer peripheral surface 123 extends parallel to the rotation axis X and the drive axis O, goes around the movable end plate 12a in the circumferential direction, and is continuous with the rear surface 121 and the front surface 122. As a result, the outer peripheral surface 123 forms the outer edge of the movable end plate 12a.

[0103] 8, the movable end plate 12a is formed with a holding portion 71, three second adjustment portions 73, and six accommodating portions 75. Each second adjustment portion 73 is also an example of an "adjustment portion" in the present invention. The holding portion 71 and each accommodating portion 75 have the same configuration as the holding portion 61 and each accommodating portion 65 in the first embodiment, except that they are formed with a smaller diameter than the holding portion 61 and each accommodating portion 65 in the first embodiment. The number of second adjustment portions 73 and each accommodating portion 75 can also be designed as appropriate.

[0104] All of the second adjustment portions 73 have the same configuration and are arranged in the circumferential direction of the movable end plate 12a. Each second adjustment portion 73 is recessed in a substantially rectangular shape from the front surface 122 toward the rear surface 121. More specifically, each second adjustment portion 73 has a rectangular shape in which the portion closest to the drive axis O extends longer in the circumferential direction of the movable end plate 12a than the portion closest to the outer periphery of the movable end plate 12a. In other words, each second adjustment portion 73 has a rectangular shape in which the portion closest to the drive axis O extends longer in the circumferential direction of the movable end plate 12a than the portion closest to the outer periphery 123 in the radial direction of the movable end plate 12a.

[0105] Each second adjustment portion 73 is composed of a bottom surface 73a, a peripheral surface 73b, and a connecting surface 73c. ​​The bottom surface 73a extends radially from the outer periphery of the movable end plate 12a toward the drive axis O, and also extends circumferentially of the movable end plate 12a, forming a substantially rectangular planar shape. Thus, the bottom surface 73a forms a plane parallel to the second surface 122. The bottom surface 73a is located closest to the rear surface 121 of the second adjustment portion 73 and forms the bottom of the second adjustment portion 73. Furthermore, the portion of the bottom surface 73a that is closer to the drive axis O extends longer in the circumferential direction of the movable end plate 12a than the portion that is closer to the outer periphery of the movable end plate 12a.

[0106] The peripheral surface 73b goes around the bottom surface 73a and surrounds the bottom surface 73a. As shown in Fig. 10, the peripheral surface 73b extends in the direction of the drive axis O so as to be spaced apart from the bottom surface 73a.

[0107] As shown in Fig. 8, the circumferential surface 73b is made up of a first circumferential surface 701, a second circumferential surface 702, a third circumferential surface 703, and a fourth circumferential surface 704. The first circumferential surface 701 is located on the circumferential surface 73b closest to the outer periphery of the movable end plate 12a, i.e., on the outer circumferential surface 123 side. The second circumferential surface 702 is located on the circumferential surface 73b closest to the drive axis O. The second circumferential surface 702 faces the first circumferential surface 701 in the radial direction of the movable end plate 12a.

[0108] The third circumferential surface 703 is located on the circumferential surface 73b between the first circumferential surface 701 and the second circumferential surface 702 and is connected to the first circumferential surface 701 and the second circumferential surface 702. The fourth circumferential surface 704 is located on the circumferential surface 73b opposite the third circumferential surface 703 in the circumferential direction of the movable end plate 12a and is located between the first circumferential surface 701 and the second circumferential surface 702. The fourth circumferential surface 704 is connected to the first circumferential surface 701 and the second circumferential surface 702.

[0109] In the circumferential surface 73b, the second circumferential surface 702 extends longer in the circumferential direction of the movable end plate 12a than the first circumferential surface 701. In addition, the third circumferential surface 703 and the fourth circumferential surface 704 extend closer to each other in the circumferential direction of the movable end plate 12a from the second circumferential surface 702 side toward the first circumferential surface 701 side.

[0110] The connecting surface 73c is located between the bottom surface 73a and the peripheral surface 73b and connects the bottom surface 73a and the peripheral surface 73b. The connecting surface 73c is made up of a first connecting portion 711, a second connecting portion 712, a third connecting portion 713, and a fourth connecting portion 714.

[0111] 10 and 11, the first connecting portion 711 is located between the bottom surface 73a and the first circumferential surface 701. As shown in FIGS. 10 and 12, the second connecting portion 712 is located between the bottom surface 73a and the second circumferential surface 702. As shown in FIG. 8, the third connecting portion 713 is located between the bottom surface 73a and the third circumferential surface 703. The fourth connecting portion 714 is located between the bottom surface 73a and the fourth circumferential surface 704. On the connecting surface 73c, the first connecting portion 711 is located at a position closest to the outer periphery of the movable end plate 11a, and the second connecting portion 712 is located at a position closest to the drive axis O.

[0112] 10 and 12, the second connection portion 712 is composed of a bottom-side second connection portion 712a, a peripheral-side second connection portion 712b, and a second flat portion 712c. The bottom-side second connection portion 712a connects to the bottom surface 73a and extends in a curved manner toward the second peripheral surface 702. The peripheral-side second connection portion 712b connects to the second peripheral surface 702 and extends in a curved manner toward the bottom surface 73a. The second flat portion 712c is located between the bottom-side second connection portion 712a and the peripheral-side second connection portion 712b. The second flat portion 712c extends flat and connects to the bottom-side second connection portion 712a and the peripheral-side second connection portion 712b.

[0113] The second connecting portion 712, consisting of the bottom surface side second connecting portion 712a, the circumferential surface side second connecting portion 712b, and the second flat portion 712c, has a shape that slopes upward from the bottom surface 73a toward the second circumferential surface 702 as a whole, and connects the bottom surface 73a and the second circumferential surface 702. In other words, when the second adjusting portion 73 is viewed in the DD cross section, the second connecting portion 712 has a chamfered shape where the portion connecting the bottom surface 73a and the second circumferential surface 702 is connected. The DD cross section is also an example of a reference cross section in the present invention.

[0114] 10 and 11, the first connecting portion 711 does not have a bottom surface side second connecting portion 712a, a peripheral surface side second connecting portion 712b, or a second flat portion 712c, unlike the second connecting portion 712. As a result, the first connecting portion 711 has an arc-shaped curve with a predetermined radius of curvature when viewed in the DD cross section, as shown in FIG.

[0115] 8 are symmetrical in the circumferential direction of the movable end plate 12a. The third connecting portion 713 connects the bottom surface 63a and the third circumferential surface 703 while curving in an arc, and the fourth connecting portion 714 connects the bottom surface 73a and the fourth circumferential surface 704 while curving in an arc. The third connecting portion 713 and the fourth connecting portion 714 are located between the first connecting portion 711 and the second connecting portion 712 in the radial direction of the movable end plate 12a. As a result, the third connecting portion 713 and the fourth connecting portion 714 are connected to the first connecting portion 711 and the second connecting portion 712, respectively.

[0116] 10 , in the DD cross section, a third imaginary line Y3 extending linearly from the bottom surface 73a toward the drive shaft center O, a fourth imaginary line Y4 extending linearly from the second circumferential surface 702 toward the third imaginary line Y3, and a second imaginary arc R2 forming an arc equal to the first connection portion 711 are imaginary. The second imaginary arc R2 is tangent to the third imaginary line Y3 and the fourth imaginary line Y4 and is disposed between the bottom surface 73a and the second circumferential surface 702. As a result, the second connection portion 712, more specifically, the bottom surface-side second connection portion 712a, the circumferential surface-side second connection portion 712b, and the second flat portion 712c are located on the opposite side of the second imaginary arc R2 from the intersection M2 of the third imaginary line Y3 and the fourth imaginary line Y4.

[0117] As a result, the bottom surface 73a and the first circumferential surface 701 are connected in an arc shape by the first connecting portion 711, while the bottom surface 73a and the second circumferential surface 702 are connected more gently by the second connecting portion 712. Although not shown in detail, the second connecting portion 712 has a gentler shape than the third connecting portion 713 and the fourth connecting portion 714.

[0118] Thus, the first connecting portion 711 connects the bottom surface 73a and the first circumferential surface 701 in an arc shape, while the second connecting portion 712 connects the bottom surface 73a and the second circumferential surface 702 more gently, so that the second circumferential surface 702 extends a shorter distance in the direction of the drive axis O than the first circumferential surface 701. Specifically, the first circumferential surface 701 extends from the bottom surface 703a toward the front surface 122 a fourth length L14, while the second circumferential surface 702 extends from the bottom surface 73a toward the front surface 122 a third length L13 that is shorter than the fourth length L14.

[0119] As described above, the third circumferential surface 703 is connected to the first circumferential surface 701 and the second circumferential surface 702. Furthermore, the third connection portion 713 is connected to the first connection portion 711 and the second connection portion 712, and therefore the second connection portion 712 side of the third connection portion 713 connects the bottom surface 73a and the third circumferential surface 703 more loosely than the first connection portion 711 side. For these reasons, the third circumferential surface 703 extends a fourth length L14 from the bottom surface 73a toward the front surface 122 at the point where it connects with the first circumferential surface 701, whereas the third circumferential surface 703 extends a third length L13 from the bottom surface 73a toward the front surface 122 at the point where it connects with the second circumferential surface 702. That is, the length of third circumferential surface 703 in the direction of drive axis O gradually decreases from fourth length L14 to third length L13 from the first circumferential surface 701 side toward second circumferential surface 702 side. Although not shown, the length of fourth circumferential surface 704 in the direction of drive axis O also gradually decreases from fourth length L14 to third length L13 from the first circumferential surface 701 side toward second circumferential surface 702 side. Note that the shapes of third circumferential surface 703, fourth circumferential surface 704, third connecting portion 713, and fourth connecting portion 714 can be designed as appropriate.

[0120] 9, the movable scroll body 12b is integrally formed with the rear surface 121 of the movable end plate 12a. The movable scroll body 12b protrudes in a spiral shape from the rear surface 121 toward the fixed scroll 9 in the directions of the rotation axis X and the drive axis O. The other configurations of the movable scroll body 12b are the same as those of the movable scroll body 11b in the first embodiment, and detailed description thereof will be omitted.

[0121] Like the movable scroll 11 of Example 1, the movable scroll 12 is also formed through a preparation step, a casting step, and a completion step. Specifically, in the preparation step, a third molding die 91 and a fourth molding die 93 shown in FIG. 13 are prepared. The third molding die 91 has a third molding surface 91a formed therein, and the fourth molding die 93 has a fourth molding surface 93a formed therein. Then, the third molding die 91 and the fourth molding die 93 are clamped together with the third molding surface 91a and the fourth molding surface 93a facing each other, whereby a second cavity 95 is formed by the third molding surface 91a and the fourth molding surface 93a.

[0122] In addition, the fourth forming surface 93a is provided with a holding portion forming portion 931 for forming the holding portion 71, a second adjustment portion forming portion 932 for forming each second adjustment portion 73, and a storage portion forming portion 933 for forming each storage portion 75.

[0123] A second pouring gate 97 is formed in the fourth molding die 93. The second pouring gate 97 is connected to the second cavity 95 at a position closer to the drive axis O than the outer periphery of the movable end plate 12a.

[0124] Then, by performing a casting process, molten metal is supplied from the second pouring gate 97 and filled into the second cavity 95. At this time, the molten metal is filled into the second cavity 95 while being appropriately pressurized by a plunger (not shown). In addition, the molten metal filled into the second cavity 95 is locally pressurized by a squeeze pin (not shown).

[0125] Here, the second inlet 97 is connected to a portion of the second cavity 95 that is on the drive axis O side. Therefore, the molten metal supplied from the second inlet 97 flows through the second cavity 95 from the drive axis O side, i.e., the center side of the movable end plate 12a, toward the outer periphery of the movable end plate 12a. The molten metal is then solidified within the second cavity 95 to form an intermediate body (not shown) of the movable scroll 12. Thereafter, similar to the movable scroll 11 of Example 1, the intermediate body is subjected to a finishing process to complete the movable scroll 12.

[0126] As described above, in the second embodiment, by casting the movable scroll 12, not only the movable end plate 12a and the movable scroll body 12b but also the retaining portion 71, each second adjustment portion 73, and each accommodating portion 75 are simultaneously and integrally formed with the movable end plate 12a. That is, in each second adjustment portion 73 formed by casting, as described above, the length of the second circumferential surface 702 in the direction of the drive axis O is shorter than the length of the first circumferential surface 701 in the direction of the drive axis O, the second connecting portion 712 has a gentler shape than the first connecting portion 711, and the second adjustment portion forming portion 932 of the fourth forming surface 93a is formed so that the lengths of the third circumferential surface 703 and the fourth circumferential surface 704 in the direction of the drive axis O gradually decrease from the first circumferential surface 701 side toward the second circumferential surface 702 side. Other configurations of this compressor are similar to those of the compressor of the first embodiment, and the same components are designated by the same reference numerals, and detailed description thereof will be omitted.

[0127] In this compressor, when the movable scroll 12 is formed by casting, molten metal is circulated from a portion of the second cavity 95 that is closer to the drive axis O toward the outer periphery of the movable end plate 12a. Therefore, on the circumferential surface 73b, the second circumferential surface 702 is located upstream of the first circumferential surface 701 in the direction of molten metal flow, and on the connecting surface 73c, the second connecting portion 712 is located upstream of the first connecting portion 711 in the direction of molten metal flow. Here, the second connecting portion 712 is located on the opposite side of the second imaginary arc R2 from the intersection M2 of the third imaginary line Y3 and the fourth imaginary line Y4, and connects the bottom surface 73a and the second circumferential surface 702 with a shape that is gentler than the arc-shaped first connecting portion 711.

[0128] The first peripheral surface 701 extends from the bottom surface 73a toward the front surface 122 by a fourth length L14, while the second peripheral surface 702 extends from the bottom surface 73a toward the front surface 122 by a third length L13 that is shorter than the fourth length L14.

[0129] For these reasons, in this compressor, when forming the movable scroll 12, the fluidity of the molten metal is high at the second circumferential surface 702 and the second connecting portion 712, as indicated by the dashed arrows in Fig. 12. In other words, the molten metal flows favorably at the locations within the second cavity 95 where the second circumferential surface 702 and the second connecting portion 712 are formed. For this reason, in this compressor, even when the second adjustment portions 73 are made deeper, it is possible to favorably form each second adjustment portion 73, including the second circumferential surface 702 and the second connecting portion 712.

[0130] Furthermore, in this compressor, the second connection portion 712 is composed of a bottom-side second connection portion 712a, a peripheral-side second connection portion 712b, and a second flat portion 712c. As a result, when the second adjustment portion 73 is viewed in a DD cross section, the second connection portion 712, which connects the bottom surface 73a and the second peripheral surface 702, has a chamfered shape. Furthermore, the second flat portion 712c in the second connection portion 712 makes it possible to sufficiently increase the fluidity of the molten metal. Other functions of this compressor are similar to those of the compressor of Example 1.

[0131] Example 3 14, in the compressor of the third embodiment, the connection surface 63c has a first connection portion 615 instead of the first connection portion 611. That is, in this compressor, the connection surface 63c is made up of the first connection portion 615, the second connection portion 612, the third connection portion 613, and the fourth connection portion 614. Therefore, the third connection portion 613 and the fourth connection portion 614 are connected to the first connection portion 615 and the second connection portion 612, respectively.

[0132] When viewed in the AA cross section, the first connecting portion 615 connects the bottom surface 63a and the first circumferential surface 601 while forming an arc-shaped curve with a larger radius of curvature than the second connecting portion 612. As a result, the first connecting portion 615 is located on the opposite side of the first virtual arc R1 from the intersection M1 of the first virtual line Y1 and the second virtual line Y2. Thus, the first connecting portion 615 forms a shape that is curved more gently than the second connecting portion 612. Other configurations of this compressor are similar to those of the compressor of the first embodiment.

[0133] As described above, since the first connecting portion 615 has a shape that is more gently curved than the second connecting portion 612, in this compressor, as in the compressor of the first embodiment, the second circumferential surface 602 extends from the bottom surface 63 a toward the front surface 112 by the second length L12, whereas the first circumferential surface 601 extends from the bottom surface 63 a toward the front surface 112 by the first length L11 that is shorter than the second length L12. Furthermore, in the third connecting portion 613, the connection between the bottom surface 63 a and the third circumferential surface 603 is more gently formed on the first connecting portion 615 side than on the second connecting portion 612 side. Similarly, in the fourth connecting portion 614, the connection between the bottom surface 63 a and the fourth circumferential surface 604 is more gently formed on the first connecting portion 615 side than on the second connecting portion 612 side. Therefore, the third circumferential surface 603 and the fourth circumferential surface 604 gradually become shorter from the second length L12 to the first length L11 from the second circumferential surface 602 side toward the first circumferential surface 601 side.

[0134] As a result, in this compressor as well, when the movable scroll 11 is formed by casting, the fluidity of the molten metal is increased at the first peripheral surface 601 and the first connecting portion 615 when the molten metal is caused to flow from the outer periphery of the movable end plate 11a in the first cavity 85 toward the drive axis O. Other functions of this compressor are the same as those of the compressor of the first embodiment.

[0135] Example 4 15, in the compressor of the fourth embodiment, the connection surface 73c has a second connection portion 715 instead of the second connection portion 712. That is, in this compressor, the connection surface 73c is made up of a first connection portion 711, a second connection portion 715, a third connection portion 713, and a fourth connection portion 714. Therefore, the third connection portion 713 and the fourth connection portion 714 are connected to the first connection portion 711 and the second connection portion 715, respectively.

[0136] When viewed in the DD cross section, the second connecting portion 715 has an arc-shaped curve with a larger radius of curvature than the first connecting portion 711, and connects the bottom surface 73a and the second circumferential surface 702. As a result, the second connecting portion 715 is located on the opposite side of the second virtual arc R2 from the intersection M2 of the third virtual line Y3 and the fourth virtual line Y4. Thus, the second connecting portion 715 has a shape that is curved more gently than the first connecting portion 711. The other configurations of this compressor are the same as those of the compressor of the second embodiment.

[0137] In this way, since the second connecting portion 715 has a shape that is more gently curved than the first connecting portion 711, in this compressor, as in the compressor of the second embodiment, the first circumferential surface 70 1 extends from the bottom surface 73a toward the front surface 122 a fourth length L14, whereas the second circumferential surface 702 extends from the bottom surface 73a toward the front surface 122 a third length L13 that is shorter than the fourth length L14. Furthermore, in the third connecting portion 713, the second connecting portion 715 side connects the bottom surface 73a and the third circumferential surface 703 more loosely than the first connecting portion 711 side. Similarly, in the fourth connecting portion 714, the second connecting portion 715 side connects the bottom surface 73a and the fourth circumferential surface 704 more loosely than the first connecting portion 711 side. Therefore, the third circumferential surface 703 and the fourth circumferential surface 704 are connected to the first circumferential surface 70 1 The length gradually decreases from the fourth length L14 to the third length L13 from the side toward the second circumferential surface 702 side.

[0138] As a result, in this compressor as well, when the movable scroll 12 is formed by casting, the fluidity of the molten metal is increased at the second circumferential surface 702 and the second connecting portion 715 when the molten metal is caused to flow from the drive axis O side toward the outer periphery of the movable end plate 12a in the second cavity 95. Other functions of this compressor are the same as those of the compressor of the first embodiment.

[0139] The present invention has been described above in accordance with Examples 1 to 4, but it goes without saying that the present invention is not limited to the above Examples 1 to 4 and can be modified and applied as appropriate within the scope of the invention.

[0140] For example, in the compressors of Examples 1 to 4, the fixed scroll 9 is the "first scroll" of the present invention. However, the present invention is not limited to this, and a first scroll that rotates about the rotation axis X may be adopted, and the movable scrolls 11 and 12 may rotate relative to the first scroll about the drive axis O.

[0141] Furthermore, in the compressors of Examples 1 and 3, as long as the length of first circumferential surface 601 in the direction of drive axis O is shorter than the length of second circumferential surface 602 in the direction of drive axis O, the shapes of first connecting portions 611, 615 and second connecting portion 612 can be designed appropriately. Similarly, in the compressors of Examples 2 and 4, as long as the length of second circumferential surface 702 in the direction of drive axis O is shorter than the length of first circumferential surface 701 in the direction of drive axis O, the shapes of first connecting portion 711 and second connecting portions 712, 715 can be designed appropriately.

[0143] Furthermore, in the compressors of Examples 1 to 4, the rotation prevention mechanism 16 is configured by a plurality of rings 47 and a plurality of rotation prevention pins 31. However, the invention is not limited to this, and the rotation prevention mechanism 16 may have another configuration.

[0144] Furthermore, in the compressors of the first to fourth embodiments, the refrigerant gas as a fluid is compressed in the compression chamber 49, but this is not limiting, and the compression chamber 49 may compress a fluid such as air to be supplied to the fuel cell. [Industrial Applicability]

[0145] The present invention can be used in air conditioning systems for vehicles and the like. [Explanation of symbols]

[0146] 1. Housing 5...Drive shaft 9...Fixed scroll (1st scroll) 11... Movable scroll (second scroll) 11a...Movable end plate (end plate) 11b...Moving spiral body (spiral body) 12...Moving scroll (second scroll) 12a...Movable end plate (end plate) 12b...Moving spiral body (spiral body) 63...First adjustment section (adjustment section) 63a…Bottom surface 63b...peripheral surface 63c...Connection surface 73...Second adjustment section (adjustment section) 73a…Bottom surface 73b...peripheral surface 73c...Connection surface 111…Rear side (first side) 112…Front (second side) 121…Rear side (first side) 122…Front (second side) 601...First peripheral surface 602…Second peripheral surface 603...Third peripheral surface 611...First connection part 611a...First connection part on the bottom side 611b... First connection portion on peripheral surface side 611c…1st flat part 612...Second connection part 615...First connection part 701...First peripheral surface 702…Second peripheral surface 703...Third peripheral surface 711...First connection part 712...Second connection part 712a...Second connection part on the bottom side 712b...Second connecting portion on the peripheral surface 712c…Second flat part 715...Second connection part O...Drive shaft center

Claims

1. Housing and a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and rotating relative to the first scroll about the drive axis to form a compression chamber for compressing a fluid between the first scroll and the second scroll, the second scroll includes an end plate extending in a disk shape intersecting the drive axis, the end plate having a first surface facing the first scroll and a second surface positioned opposite to the first surface; a scroll body that is integral with the end plate and that protrudes in a spiral shape from the first surface toward the first scroll in the drive shaft direction; an adjustment portion formed on the end plate, recessed from the second surface toward the first surface, for adjusting the center of gravity of the second scroll, The adjustment portion has a bottom surface parallel to the second surface; a peripheral surface that surrounds the bottom surface and extends linearly in the drive shaft direction; a connecting surface located between the bottom surface and the peripheral surface and connecting the bottom surface and the peripheral surface, the circumferential surface includes a first circumferential surface located on the outer circumferential side of the end plate, a second circumferential surface located closer to the drive shaft center than the first circumferential surface and facing the first circumferential surface in the radial direction of the end plate, a third circumferential surface located between the first circumferential surface and the second circumferential surface and connecting the first circumferential surface and the second circumferential surface, and a fourth circumferential surface located between the first circumferential surface and the second circumferential surface and facing the third circumferential surface in the circumferential direction of the end plate, and connecting the first circumferential surface and the second circumferential surface, the connecting surface has a first connecting portion connecting the bottom surface and the first peripheral surface, a second connecting portion connecting the bottom surface and the second peripheral surface, a third connecting portion connecting the bottom surface and the third peripheral surface, and a fourth connecting portion connecting the bottom surface and the fourth peripheral surface, a length of the first circumferential surface in the drive shaft direction is shorter than a length of the second circumferential surface in the drive shaft direction; a length of the third circumferential surface and a length of the fourth circumferential surface in the drive axis direction gradually decreasing from the length of the second circumferential surface in the drive axis direction to the length of the first circumferential surface in the drive axis direction from the second circumferential surface side toward the first circumferential surface side;

2. A scroll-type compressor as described in claim 1, wherein the first connection portion has a bottom-side first connection portion that connects to the bottom surface and extends in a curved manner toward the first circumferential surface, a circumferential-side first connection portion that connects to the first circumferential surface and extends in a curved manner toward the bottom surface, and a first flat portion that is located between the bottom-side first connection portion and the circumferential-side first connection portion, extends flat, and connects the bottom-side first connection portion and the circumferential-side first connection portion.

3. a cross section of the end plate taken along a plane that passes through the first circumferential surface, the second circumferential surface, and the drive shaft center and extends in a direction of the drive shaft center is defined as a reference cross section; 2. The scroll compressor according to claim 1, wherein the first connecting portion has an arc shape when viewed in the reference cross section.

4. Housing and a first scroll disposed within the housing; a second scroll provided in the housing, facing the first scroll, and rotating relative to the first scroll about the drive axis to form a compression chamber for compressing a fluid between the first scroll and the second scroll, the second scroll includes an end plate extending in a disk shape intersecting the drive axis, the end plate having a first surface facing the first scroll and a second surface positioned opposite to the first surface; a scroll body that is integral with the end plate and that protrudes in a spiral shape from the first surface toward the first scroll in the drive shaft direction; an adjustment portion formed on the end plate, recessed from the second surface toward the first surface, for adjusting the center of gravity of the second scroll, The adjustment portion has a bottom surface parallel to the second surface; a peripheral surface that surrounds the bottom surface and extends linearly in the drive shaft direction; a connecting surface located between the bottom surface and the peripheral surface and connecting the bottom surface and the peripheral surface, the circumferential surface includes a first circumferential surface located on the outer circumferential side of the end plate, a second circumferential surface located closer to the drive shaft center than the first circumferential surface and facing the first circumferential surface in the radial direction of the end plate, a third circumferential surface located between the first circumferential surface and the second circumferential surface and connecting the first circumferential surface and the second circumferential surface, and a fourth circumferential surface located between the first circumferential surface and the second circumferential surface and facing the third circumferential surface in the circumferential direction of the end plate, and connecting the first circumferential surface and the second circumferential surface, the connecting surface has a first connecting portion connecting the bottom surface and the first peripheral surface, a second connecting portion connecting the bottom surface and the second peripheral surface, a third connecting portion connecting the bottom surface and the third peripheral surface, and a fourth connecting portion connecting the bottom surface and the fourth peripheral surface, a length of the second circumferential surface in the drive shaft direction is shorter than a length of the first circumferential surface in the drive shaft direction; a length of the third circumferential surface and a length of the fourth circumferential surface in the drive axis direction gradually decreasing from the length of the first circumferential surface in the drive axis direction to the length of the second circumferential surface in the drive axis direction from the first circumferential surface side toward the second circumferential surface side;

5. A scroll-type compressor as described in claim 4, wherein the second connection portion has a bottom-side second connection portion that connects to the bottom surface and extends in a curved manner toward the second circumferential surface, a circumferential-side second connection portion that connects to the second circumferential surface and extends in a curved manner toward the bottom surface, and a second flat portion that is located between the bottom-side second connection portion and the circumferential-side second connection portion and extends flat to connect the bottom-side second connection portion and the circumferential-side second connection portion.

6. a cross section of the end plate taken along a plane that passes through the first circumferential surface, the second circumferential surface, and the drive shaft center and extends in a direction of the drive shaft center is defined as a reference cross section; 5. The scroll compressor according to claim 4, wherein the second connecting portion has an arc shape when viewed in the reference cross section.

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