Variable displacement compressor

Abstract

To provide a variable displacement compressor for actualizing easy mounting of a pin with a reduction in the press-in load even when leaving press-in work in working for mounting a front link pin of a link mechanism to a support part, while preventing the fall-off of the pin.SOLUTION: In a variable displacement compressor 1, a link mechanism 30 for linking a thrust flange (rotary member) 17 which is rotated integrally with a drive shaft 8 to a swash plate 20 has a link member 31 rotatably mounted to the swash plate 20 by inserting front link pins 32 into respective support holes 171a, 172a of a pair of support parts 171, 172 provided on the thrust flange 17. The front link pins 32 are inserted into the respective support holes 171a, 172a by pressing themselves into the respective support holes 171a, 172a or through pressing themselves into the respective support holes 171a, 172a differently with time.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a variable displacement compressor, and more particularly to a swash plate type variable displacement compressor in which a rotating member that rotates integrally with a drive shaft is connected to a swash plate via a link mechanism.

Background Art

[0002] In a swash plate type variable displacement compressor that adjusts the discharge capacity by varying the tilt angle of the swash plate by adjusting the pressure in the crank chamber, as shown in FIG. 6(a), a drive shaft 101 is rotatably supported by a housing 103 so as to penetrate the crank chamber 102, and a swash plate 104 that rotates with the rotation of the drive shaft 101 is accommodated in the crank chamber 102.

[0003] A thrust flange 105 (corresponding to a rotating member) that rotates integrally with the drive shaft 101 is fixed to the drive shaft 101 in the crank chamber 102. The thrust flange 105 is rotatably supported with respect to the inner wall surface of the housing 103 formed substantially perpendicular to the drive shaft 101.

[0004] The swash plate 104 is attached so as to be tiltable about a hinge ball 106 slidably provided on the drive shaft 101, and is configured to rotate integrally in synchronization with the rotation of the thrust flange 105 via a link mechanism 110. Note that a piston (not shown) is moored to the peripheral edge of the swash plate 104 via a shoe, and the rocking motion of the swash plate is converted into a reciprocating linear motion of the piston (see Patent Document 1).

[0005] As shown in FIG. 6(b), in the link mechanism 110, a pair of link arms 113 and 114 are connected by a front link pin 115 to a pair of support portions 111 and 112 provided integrally with the thrust flange 105. That is, support holes 111a and 112a are formed in each of the pair of support portions, pin through holes 113a and 114a are formed in the pair of link arms 113 and 114 provided between the pair of support portions 111 and 112 so as to be aligned with the support holes 111a and 112a, and the front link pin 115 is inserted through the support holes 111a and 112a formed in the pair of support portions 111 and 112 and the pin through holes 113a and 114a formed in the pair of link arms 113 and 114, thereby rotatably connecting the thrust flange 105 and the link arms 113 and 114.

[0006] Further, rear side pin through holes 113b and 114b are formed in portions of the pair of link arms 113 and 114 that are located behind the pin through holes 113a and 114a, and a link arm 104a that is integral with the inclined plate 104 disposed between the pair of link arms 113 and 114 is rotatably connected to the pair of link arms 113 and 114 by inserting a rear link pin 116 through the rear side pin through holes 113b and 114b formed in the pair of link arms 113 and 114 and a through hole 104b formed in the link arm 104a.

[0007] At this time, the front link pin 115 is fixed to the pair of support holes 111a and 112a by press-fitting in order to prevent it from falling off. On the other hand, the pair of link arms 113 and 114 are rotatably supported by the front link pin 115 with the front link pin 115 being inserted through the pin through holes 113a and 114a with a predetermined clearance.

[0008] Note that the pair of link arms 113 and 114 and the link arm 104a are rotatably connected by inserting a rear link pin 116 press-fitted into the link arm 104a through the rear side pin through holes 113b and 114b of the pair of link arms 113 and 114.

Prior Art Documents

Patent Document

[0009]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0010] However, in the conventional link mechanism, the front link pin 115 is prevented from falling off by press-fitting it into the support holes 111a and 112a of the pair of support portions 111 and 112. Therefore, in order to attach the front link pin 115 to the pair of support portions 111 and 112, one end of the front link pin 115 is press-fitted from one support hole 111a, and after passing through this one support hole 111a, the pin through holes 113a and 114a of the pair of link arms 113 and 114 are passed through, and then it is continuously press-fitted into the support hole 112a of the other support portion 112. When press-fitting into the support hole 112a of this other support portion 112, since the press-fitting into the support hole 111a of one support portion 111 is also continued, as shown in FIG. 6(c), the press-fitting load is doubled. In addition, since the insertion end portion of the front link pin 115 needs to slide through both support holes 111a and 112a, the press-fitting stroke also becomes long. For this reason, in order to attach the front link pin 115, an assembly process using a large-scale assembly device is required, and it is difficult to reduce costs. From the above, a structure of a link mechanism that can be assembled without using large-scale equipment has been demanded.

[0011] In view of the above points, a structure is also known in which the press-fitting portion of the front link pin used in the link mechanism into the support portion is eliminated, a flange is formed at one end portion, and a snap ring is attached to the other end portion to prevent it from coming off from the support portion (see Patent Document 2).

[0012] With such a structure, the front link pin is attached with clearances to both the support hole of the support portion of the thrust flange and the pin through-hole of the link arm. Therefore, in the assembly process, the press-fitting process of the front link pin becomes unnecessary, and it becomes possible to complete the assembly in a short time.

[0013] However, in such a link structure, since it is necessary to add a snap ring, there is a disadvantage that the number of parts increases and the assembly becomes complicated.

[0014] The present invention has been made in view of such circumstances, and in the operation of attaching the front link pin of the link mechanism to the support portion, even when leaving the press-fitting operation, the press-fitting load is reduced to facilitate the attachment of the pin, and the main object is to provide a variable capacity compressor capable of preventing the pin from falling off.

Means for Solving the Problems

[0015] In order to achieve the above object, a variable capacity compressor according to the present invention includes a housing (9) including a front housing (5) and a cylinder block (2), a drive shaft (8) rotatably supported by the front housing (5) and the cylinder block (2), a rotating member (17) disposed in the front housing (5), fixed to the drive shaft (8) and rotating integrally with the drive shaft (8), a link mechanism (30) having a pair of opposing support portions (171, 172) provided on the rotating member (17), a columnar front link pin (32) inserted into support holes (171a, 172a) formed in each of the pair of support portions (171, 172), and a link member (31) disposed between the pair of support portions (171, 172) and having pin through-holes (311a, 312a) through which the front link pin (32) is inserted, a swash plate (20) tiltably attached to the drive shaft (8) and connected to the rotary member (17) via the link mechanism (30) so as to rotate integrally with the rotary member (17) as the rotary member (17) rotates; a piston (15) connected to the swash plate (20) via a shoe (22) that slides relatively on the sliding surface of the swash plate (20), and that moves linearly back and forth within a cylinder bore (14) formed in the cylinder block (2) as the swash plate (20) rotates; In a variable displacement compressor (1) comprising: The front link pin (32) is characterized in that it is held in each of the support holes (171a, 172a) by being press-fitted into one of the support holes (171a, 172a) or by being press-fitted into different support holes (171a, 172a) over time.

[0016] That is, the front link pin (32) or the support holes (171a, 172a) are formed in a shape such that when the front link pin (32) is inserted into each of the support holes (171a, 172a), the front link pin (32) is pressed into one of the support holes (171a, 172a), or is pressed into a different support hole over time.

[0017] Therefore, in the installation process of the front link pin, the front link pin is not pressed into both support holes at the same time while being inserted into each support hole, which makes it possible to reduce the press-fit load when installing the front link pin.

[0018] As a more specific embodiment, the support holes (171a, 172a) formed in each of the paired support portions (171, 172) are formed to have a uniform hole diameter, and the front link pin (32) has a large-diameter shaft portion (32a) formed with an outer diameter such that the insertion end portion can be press-fitted into the support holes (171a, 172a), and other portions including the insertion tip portion are formed as a small-diameter shaft portion (32b) having an outer diameter smaller than that of the large-diameter shaft portion (32a). The large-diameter shaft portion (32a) is inserted by being press-fitted into one of the support holes (171a), and the small-diameter shaft portion (32b) may be inserted into the other support hole (172a) with a predetermined clearance.

[0019] In such a configuration, the front link pin is inserted with the small-diameter shaft portion from one support hole, and then, the small-diameter shaft portion is inserted into the other support hole while the large-diameter shaft portion is press-fitted into one support hole for fixing.

[0020] For this reason, since the press-fitting load occurs only when the large-diameter shaft portion is press-fitted into one support hole, it is possible to reduce the insertion load, and it becomes easier to miniaturize the assembly equipment. Further, since the state where the large-diameter shaft portion is press-fitted into one support hole is maintained, it is possible to prevent the front link pin from falling off.

[0021] Note that the large-diameter shaft portion is preferably equal to or shorter than the length of the support hole into which it is press-fitted. With such a configuration, the insertion load can be made smaller, and it becomes easier to further reduce the cost due to the miniaturization of the equipment.

[0022] As another example, the front link pin (32) is formed with a uniform outer diameter dimension, the support hole (172a) formed in one of the support portions (172) of the rotating member (17) is formed as a small-diameter hole (272a) formed with an inner diameter into which the front link pin (32) can be press-fitted, and the support hole (171a) formed in the other support portion (171) is formed as a large-diameter hole (271a) having an inner diameter larger than the inner diameter of the small-diameter hole (272a). The front link pin (32) may be inserted by being press-fitted into the small diameter hole (272a) and inserted into the large diameter hole (271a) with a predetermined clearance.

[0023] In this configuration, the front link pin is inserted through the large diameter hole and then press-fitted into the small diameter hole to be fixed. Therefore, the press-fit load is generated only when the front link pin is press-fitted into the small diameter hole, which makes it possible to reduce the insertion load and facilitates downsizing of the equipment.

[0024] As yet another example, each of the support holes (171a, 172a) may be formed with a uniform hole diameter, and the front link pin (32) may have large diameter shaft portions (32c, 32d) at both longitudinal ends having an outer diameter that can be press-fitted into each of the support holes (171a, 172a), and a small diameter shaft portion (32e) at the middle portion having an outer diameter smaller than that of the large diameter shaft portions (32c, 32d).

[0025] In this configuration, the large diameter shaft portion is press-fitted only when passing through the support hole, making it possible to reduce the insertion load.

[0026] Here, it is preferable that the small diameter shaft portion is formed to have a length equal to or longer than the dimension between the pair of support portions plus the length of each of the support holes.

[0027] In this configuration, the large diameter shaft portion can be positioned outside the support portion. Although the front link pin is allowed to move in the axial direction, the large diameter shaft portions at both ends can function as retaining members, making it possible to reliably prevent the front link pin from falling off.

[0028] Furthermore, it is desirable that the width of the large diameter shaft portion be shorter than the length of the support hole. This configuration makes it possible to further reduce the press-fit load when the large diameter shaft portion is press-fitted into the support hole. It also makes it possible to reduce the amount of protrusion of the large diameter shaft portion outside the support portion.

Advantages of the Invention

[0029] As described above, in the link mechanism that connects the rotating member and the swash plate, the front link pin is press-fitted into any one of the support holes, or is inserted into each support hole through press-fitting into different support holes over time. Therefore, in the attachment process of the front link pin, the front link pin is not simultaneously press-fitted into the support holes of the two support portions, and it becomes possible to reduce the press-fitting load during insertion. As a result, it is possible to reduce the size of the equipment and reduce the cost. In addition, since a state where the front link pin is press-fitted into the support hole is formed, or since it is attached to the maintaining portion through the press-fitting state with the support hole, it is also possible to prevent the front link pin from falling off.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0031] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0032] In FIG. 1, a variable displacement swash plate compressor used in a refrigeration cycle is shown as an example of a variable displacement compressor 1. This variable displacement compressor 1 includes a cylinder block 2, a rear head 4 assembled to the rear side (right side in the figure) of the cylinder block 2 via a valve plate 3, and a front housing 5 assembled to close the front side (left side in the figure) of the cylinder block 2. These front housing 5, cylinder block 2, valve plate 3, and rear head 4 are axially fastened by fastening bolts 6 and constitute a housing 9 of the entire variable displacement compressor 1.

[0033] In the crank chamber 7 defined by the front housing 5 and the cylinder block 2, a drive shaft 8 with one end protruding from the front housing 5 is accommodated so as to penetrate the crank chamber 7. A drive pulley (not shown) connected to the vehicle engine via a belt is fixed to the portion of the drive shaft 8 protruding from the front housing 5. One end side of the drive shaft 8 is sealed by a shaft seal member 10 provided between the drive shaft 8 and the front housing 5, preventing refrigerant leakage along the drive shaft 8.

[0034] One end side of the drive shaft 8 is rotatably supported by a radial bearing 11 accommodated on the crank chamber 7 side of the shaft seal member 10 of the front housing 5, and the other end side of the drive shaft 8 is rotatably supported by a radial bearing 12 accommodated in the cylinder block 2.

[0035] The cylinder block 2 is formed with a support hole 13 for accommodating the radial bearing 12 and a plurality of cylinder bores 14 arranged at equal intervals on the circumference centered on the support hole 13. A piston 15 is inserted into each cylinder bore 14 so as to be reciprocally slidable. The piston 15 is formed by axially joining a head portion 15a inserted into the cylinder bore 14 and an engaging portion 15b protruding into the crank chamber 7.

[0036] A thrust flange 17 (corresponding to a rotating member) that rotates integrally with the drive shaft 8 is fixed to the drive shaft 8 in the crank chamber 7. The thrust flange 17 is rotatably supported via an annular thrust bearing 18 with respect to the inner wall surface of the front housing 5 formed substantially perpendicular to the drive shaft 8. An inclined plate 20 is connected to the thrust flange 17 via a link mechanism 30.

[0037] The swash plate 20 is attached so as to be tiltable about a hinge ball 21 slidably provided on the drive shaft 8, and is configured to rotate integrally in synchronization with the rotation of the thrust flange 17 via a link mechanism 30. And, at the peripheral edge of the swash plate 20, the engaging portion 15b of the piston 15 is latched via a pair of shoes 22 arranged in the front and rear directions.

[0038] Therefore, when the drive shaft 8 rotates, the thrust flange 17 and the swash plate 20 rotate accordingly, and the rotational motion of the swash plate 20 is converted into a reciprocating linear motion of the piston 15 via the shoes 22, so that the volume of the compression chamber 23 formed between the piston 15 and the valve plate 3 in the cylinder bore 14 is changed.

[0039] As shown in FIG. 2, the link mechanism 30 has a link member 31 that is rotatably attached to the thrust flange 17 and also rotatably attached to the swash plate 20 in this example.

[0040] On the thrust flange 17, support portions 171, 172 that protrude toward the swash plate 20 and form a pair are formed. Further, on the swash plate 20, a swash plate arm 201 that protrudes toward the thrust flange 17 is formed. The swash plate arm 201 of the swash plate 20 is inserted between the respective support portions 171, 172. A link member 31 having link arms 311, 312 that are components of the link mechanism 30 and form a pair is slidably inserted between each of the support portions 171, 172 and the swash plate arm 201.

[0041] In each of the support portions 171, 172, support holes 171a, 172a are formed on a first axis β that intersects the axis α of the drive shaft 8.

[0042] In the link arms 311, 312 of the link member 31, pin through holes 311a, 312a are formed on the first axis β at one end side in the longitudinal direction.

[0043] Support holes 171a and 172a provided in the support portions 171 and 172 of the thrust flange 17 and pin through holes 311a and 312a of the link arms 311 and 312 of the link member 31 have a front link pin 32 inserted therein. This front link pin 32 is attached in a state of being prevented from coming off with respect to the support holes 171a and 172a of the support portions 171 and 172, and is inserted rotatably with a clearance with respect to the pin through holes 311a and 312a of the link arms 311 and 312. Thereby, the link member 31 is rotatably connected to the thrust flange 17.

[0044] A through hole 201a is formed on a third axis γ parallel to the second axis β in the swash plate arm 201 of the swash plate 20. This swash plate arm 201 is disposed between the paired link arms 311 and 312 of the link member 31, and pin through holes 311b and 312b are formed on the third axis γ on the other end side in the longitudinal direction in each of the paired link arms 311 and 312. A rear link pin 33 is inserted through the through hole 201a of the swash plate arm 201 and the pin through holes 311b and 312b of the link arms 311 and 312. The rear link pin 33 is inserted in a state of being press-fitted into the through hole 201a of the swash plate arm 201, and is inserted rotatably with a predetermined clearance with respect to the pin through holes 311b and 312b of the link arms 311 and 312. Thereby, the swash plate 20 is rotatably connected to the link member 31.

[0045] As described above, the link mechanism 30 is composed of the paired support portions 171 and 172, the swash plate arm 201, the link member 31, the front link pin 32, and the rear link pin 33, and rotates the thrust flange 17 and the swash plate 20 in accordance with the rotation of the drive shaft 8 while allowing the swash plate 20 to swing.

[0046] Incidentally, the front link pin 32 of the link mechanism 30 is attached to the paired support portions 171 and 172 as follows, aiming to improve the ease of attachment and prevent detachment.

[0047] <Embodiment 1> 3, the support holes 171a, 172a formed in the pair of support portions 171, 172 are formed with a uniform hole diameter. One end of the front link pin 32 is a large diameter shaft portion 32a formed with an outer diameter that can be press-fitted into the support hole 171a, and the other portion is a small diameter shaft portion 32b having an outer diameter smaller than that of the large diameter shaft portion 32a.

[0048] The large diameter shaft portion 32a is press-fitted and fixed into one of the support holes 171a, and the small diameter shaft portion 32b is inserted into the other support hole 172a with a predetermined clearance, and is attached in a loose fit state. The small diameter shaft portion 32b is also inserted into the pin through holes 311a, 312a of the link arms 311, 312 of the link member 31 with a predetermined clearance.

[0049] In this example, the length of the front link pin 32 is preferably formed to be the dimension between the pair of support portions 171, 172 plus the lengths of the respective support holes 171a, 172a. The axial length of the large diameter shaft portion 32a is preferably formed to be equal to the length of the support hole 171a into which it is press-fitted. Furthermore, although the axial lengths of the support hole 171a and the large diameter shaft portion 32a are formed to be equal, this is not limiting, and for example, the large diameter shaft portion 32a may be shorter than the length of the support hole 171a.

[0050] To form such a link mechanism 30, the tip of the small diameter shaft portion 32b of the front link pin 32 is inserted through the support hole 171a of one support portion 171, and is then passed through the support hole 171a and the pin through holes 311a, 312a of the paired link arms 311, 312. Up until this point, clearances have been formed between the front link pin 32 and the support hole 171a and between the front link pin 32 and the pin through holes 311a, 312a, so that the front link pin 32 can be inserted without applying any particular force. Thereafter, when the small diameter shaft portion 32b is inserted into the other support hole 172a, the large diameter shaft portion 32a begins to be press-fit into one support hole 171a, and the press-fit load increases as the insertion amount of the large diameter shaft portion 32a into the support hole 171a increases. However, because only the large diameter shaft portion 32a is press-fitted into the support hole 171a, the press-fit load does not become very large, and once the entire large diameter shaft portion 32a is press-fitted into the support hole 171a, the press-fit load reaches its maximum and does not increase any further. Also, once the entire large diameter shaft portion 32a is press-fitted into the support hole 171a, installation of the front link pin 32 is complete.

[0051] Therefore, the press-fitting stroke is only the axial length of the large-diameter shaft portion 32a, so it can be made smaller than conventional methods, allowing for shorter assembly times. Furthermore, the press-fitting load is only the load required to press-fit into the support hole 171a on one side, so it can be made smaller than conventional methods and does not require large-scale equipment. Furthermore, because the front link pin 32 is press-fitted and fixed in the support hole 171a, the front link pin 32 is held in the support holes 171a and will not fall out.

[0052] If the length of the large diameter shaft portion 32a is made shorter than the length of the support hole 171a, the press-fit load can be further reduced, which can further contribute to the miniaturization of the equipment.

[0053] <Embodiment 2> In the link mechanism 30 shown in FIG. 4, the front link pin 32 is formed with a uniform outer diameter dimension. Further, the support hole 172a formed in one support portion 172 of the thrust flange 17 is formed as a small-diameter hole 272a having an inner diameter into which the front link pin 32 can be press-fitted, and the support hole 171a formed in the other support portion 171 of the thrust flange 17 is formed as a large-diameter hole 271a having an inner diameter larger than the inner diameter of the small-diameter hole 272a.

[0054] Therefore, the front link pin 32 is fixed to the small-diameter hole 272a by press-fitting, inserted into the large-diameter hole 271a with a predetermined clearance, and attached in a clearance fit state. Further, the front link pin 32 is inserted through the pin through-holes 311a, 312a of the link member 31 with a predetermined clearance.

[0055] To form such a connection state, the link mechanism 30 inserts one end of the front link pin 32 from the large-diameter hole 271a, passes through this large-diameter hole 271a, and also passes through the pin through-holes 311a, 312a of the paired link arms 311, 312. Until this point, the front link pin 32 is smoothly inserted without being press-fitted. Then, when it comes to the stage of press-fitting one end of the front link pin 32 into the small-diameter hole 272a, the press-fitting load increases as the insertion amount of the front link pin 32 into the small-diameter hole 272a increases. However, since the front link pin 32 is press-fitted only in the small-diameter hole 272a, the press-fitting load does not become so large, and when the front link pin 32 is press-fitted into the entire small-diameter hole 272a, the press-fitting load reaches its maximum and does not increase any further. Also, when the front link pin 32 is press-fitted into the entire small-diameter hole 272a, the attachment of the front link pin 32 is completed.

[0056] Therefore, the press-fitting stroke is only as long as the axial length of the small-diameter hole 272a, so it can be made smaller than before, and assembly can be performed in a shorter time. Also, since the press-fitting load is only the load required for press-fitting into the support hole 172a on one side, the press-fitting load can be made smaller than before, eliminating the need for large-scale equipment. Further, since the front link pin 32 is press-fitted and fixed at the portion of the small-diameter hole 272a, the front link pin 32 is held without falling out from within the support holes 171a and 172a.

[0057] <Embodiment 3> In the link mechanism 30 shown in FIG. 5, the support holes 171a and 172a of the respective support portions 171 and 172 are formed with a uniform hole diameter. Also, the front link pin 32 includes large-diameter shaft portions 32c and 32d having an outer diameter that can be press-fitted into the support holes 171a and 172a at both ends in the longitudinal direction, and a small-diameter shaft portion 32e having an outer diameter smaller than that of the large-diameter shaft portions 32c and 32d at the intermediate portion.

[0058] Also, the inner diameters of the pin through-holes 311a and 312a of the link arms 311 and 312 of the link member 31 are formed larger than the large-diameter shaft portions 32c and 32d of the front link pin 32. Therefore, the small-diameter shaft portion 32e is inserted with a clearance with respect to the support holes 171a and 172a and the pin through-holes 311a and 312a.

[0059] In this example, the small-diameter shaft portion 32e is formed to be equal to or longer than the length obtained by adding the lengths of the respective support holes 171a and 172a to the dimension between the paired support portions 171 and 172. Also, the large-diameter shaft portions 31c and 32d are located outside the opposing paired support portions 171 and 172, and the axial width thereof is formed shorter than the length of the support holes 171a and 172a.

[0060] To form such a connected state, the link mechanism 30 press-fits the large-diameter shaft portion 32d formed at one end of the front link pin 32 into the support hole 171a of one support portion 171 from the outside and inserts it through this support hole 171a. Then, the link mechanism 30 inserts through the pin through-holes 311a and 312a of the pair of link arms 311 and 312. Then, by press-fitting the large-diameter shaft portion 32d again into the support hole 172a of the other support portion 172 from the inside and inserting it through this support hole 172a, the attachment of the front link pin 32 is completed. That is, in this example, the front link pin 32 is inserted into the respective support holes 171a and 172a through press-fitting into different support holes 171a and 172a over time. The front link pin 32 is inserted in a state where it has a predetermined clearance with respect to the support holes 171a and 172a of the paired support portions 171 and 172 and is attached in a clearance fit state. However, since the large-diameter shaft portions 32c and 32d at both ends function as retaining means, the front link pin 32 is held without falling out of the support holes 171a and 172a.

[0061] Therefore, according to the above-described method of attaching the front link pin 32, as shown in FIG. 5(b), the press-fitting load of the front link pin 32 is determined by the friction coefficient of the contact portion where the outer peripheral surface of the large-diameter shaft portion 32d contacts the inner peripheral surfaces of the support holes 171a and 172a, the pressure due to the interference fit, and the area only while one large-diameter shaft portion 32d is being inserted through one support hole 171a and while being inserted through the other support hole 172a. For this reason, although the press-fitting stroke is the same as the conventional one, since the axial length of the outer peripheral surface of the large-diameter shaft portion 32d is set smaller than the length of the support holes 171a and 172a (the area of the contact portion is small), the front link pin 32 is press-fitted with the press-fitting load when the entire outer peripheral surface of the large-diameter shaft portion 32d slides on the inner peripheral surfaces of the support holes 171a and 172a as the upper limit. Therefore, it is possible to make the press-fitting load for attaching the front link pin 32 smaller than the conventional one.

[0062] As described above, in the link mechanism 30 of the variable capacity compressor 1, the front link pin 32 or the support holes 171a and 172a are formed so that the front link pin 32 is not press-fitted into the support holes 171a and 172a of both support portions 171 and 172 at the same time. That is, the front link pin 32 is press-fitted only into one of the support holes, or even when press-fitting into both support holes 171a and 172a, the front link pin 32 is press-fitted into each support hole 171a and 172a with a time difference. Thus, it becomes possible to reduce the press-fitting load, and it becomes possible to reduce the cost by downsizing the equipment. Further, since the front link pin 32 is attached in a state where it is press-fitted into one of the support portions 171 and 172, or the front link pin 32 is provided with a function of preventing it from coming off from the support portions 171 and 172, it is also possible to prevent the front link pin 32 from falling off from the support portions 171 and 172.

Explanation of Signs

[0063] 1 Variable capacity compressor 2 Cylinder block 5 Front housing 8 Drive shaft 9 Housing 15 Piston 17 Thrust flange (corresponding to a rotating member) 20 Swash plate 22 Shoe 31 Link member 32 Front link pin 32a Large diameter shaft portion 32b Small diameter shaft portion 32c, 32d Large diameter shaft portion 32e Small diameter shaft portion 33 Rear link pin 171, 172 Support portion 171a, 172a Support hole 201 Swash plate arm 201a Through hole 271a Large diameter hole 272a Small diameter hole 311, 312 Link arm Pin through holes 311a and 312a Pin through holes 311b and 312b

Claims

1. A housing (9) including a front housing (5) and a cylinder block (2), a drive shaft (8) rotatably supported by the front housing (5) and the cylinder block (2), a rotating member (17) disposed within the front housing (5), fixed to the drive shaft (8) and rotating integrally with the drive shaft (8), a link mechanism (30) having opposing pairs of support portions (171, 172) provided on the rotating member (17), cylindrical front link pins (32) inserted into support holes (171a, 172a) formed in respective ones of the pair of support portions (171, 172), and a link member (31) disposed between the pair of support portions (171, 172) and having pin through-holes (311a, 312a) through which the front link pins (32) are inserted, an inclined plate (20) tiltably attached to the drive shaft (8) and connected to the rotating member (17) via the link mechanism (30), and rotating integrally with the rotation of the rotating member (17), a piston (15) connected to the inclined plate (20) via a shoe (22) slidably moving relative to a sliding surface of the inclined plate (20), and linearly reciprocating within a cylinder bore (14) formed in the cylinder block (2) with the rotation of the inclined plate (20), in a variable displacement compressor (1) comprising: The variable displacement compressor, wherein the front link pin (32) is held within each of the support holes (171a, 172a) by press-fitting into one of the support holes (171a, 172a) or by passing through press-fitting into different support holes (171a, 172a) over time.

2. The support holes (171a, 172a) formed in respective ones of the pair of support portions (171, 172) are formed with a uniform hole diameter, The front link pin (32) has a large-diameter shaft portion (32a) formed with an outer diameter such that an insertion end portion can be press-fitted into the support holes (171a, 172a), and a small-diameter shaft portion (32b) having an outer diameter smaller than that of the large-diameter shaft portion (32a) for other portions including an insertion tip portion. The large-diameter shaft portion (32a) is inserted by press-fitting into one of the support holes (171a), and the small-diameter shaft portion (32b) is inserted into the other support hole (172a) with a predetermined clearance. The variable-capacity compressor according to claim 1, characterized in that.

3. The large-diameter shaft portion (32a) is equal to or shorter than the length of the support hole (171a) into which it is press-fitted. The variable-capacity compressor according to claim 2, characterized in that.

4. The front link pin (32) is formed with a uniform outer diameter dimension. The support hole (172a) formed in one of the support portions (172) of the rotating member (17) is formed in a small-diameter hole (272a) having an inner diameter into which the front link pin (32) can be press-fitted, and the support hole (171a) formed in the other support portion (171) is formed in a large-diameter hole (271a) having an inner diameter larger than the inner diameter of the small-diameter hole (272a). The front link pin (32) is inserted by press-fitting into the small-diameter hole (272a), and is inserted into the large-diameter hole (271a) with a predetermined clearance. The variable-capacity compressor according to claim 1, characterized in that.

5. Each of the support holes (171a, 172a) is formed with a uniform hole diameter. The front link pin (32) is provided at both ends in the longitudinal direction with large-diameter shaft portions (32c, 32d) having an outer diameter that can be press-fitted into each of the support holes (171a, 172a), and is provided in the middle portion with a small-diameter shaft portion (32e) having an outer diameter smaller than that of the large-diameter shaft portions (32c, 32d). The variable-capacity compressor according to claim 1, characterized in that.

6. The small-diameter shaft portion (32e) is formed to be equal to or longer than the length obtained by adding the lengths of the respective support holes (171a, 172a) to the dimension between the pair of support portions (171, 172). The variable-capacity compressor according to claim 5, characterized in that.

7. The width of the large-diameter shaft portions (32c, 32d) is shorter than the length of the support holes (171a, 172a). The variable-capacity compressor according to claim 5 or 6, characterized in that.

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