JP2010144638A - Variable displacement compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable displacement compressor having biasing means for increasing an inclination angle of a swash plate substantially uniformly and stably biasing without tilting the swash plate, in which the fixation to a drive shaft is easy without the risk of falling off. <P>SOLUTION: The variable displacement compressor having the swash plate with a variable inclination angle for converting the rotation of the drive shaft into the reciprocating motion of a piston, has: a plurality of the biasing means disposed to surround the periphery of the drive shaft for biasing the swash plate in an inclination angle increasing direction; a connecting means formed annularly to surround the periphery of the drive shaft for connecting the plurality of the biasing means; and an integrated biasing member having a rotation inhibiting means integrally formed thereon for inhibiting relative rotation of the connecting means with respect to the drive shaft. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a swash plate type variable capacity compressor, and more particularly to a variable capacity compressor suitable for use in a vehicle air conditioner or the like with improved swash plate tilt restriction and change mechanisms.

  In a swash plate type variable capacity compressor in which the piston stroke is changed by changing the tilt angle of the swash plate to change the capacity, the operation in the direction of smooth tilt increase in the vicinity of the minimum tilt angle of the swash plate is ensured. For this reason, a structure is known in which a biasing means (for example, a tilt-increasing spring) that biases the swash plate from the minimum tilt position in the tilt increasing direction is provided (for example, Patent Document 1). In this Patent Document 1, a compression coil spring is used as an inclination-increasing spring, but there may be a case where there is not enough space for arranging such a compression coil spring.

In Patent Document 2, a tilt-increasing spring (return spring) that biases the swash plate in a tilt-increasing direction via a sleeve is formed by a plate spring.
JP 2001-304107 A U.S. Pat. No. 4,428,718

As disclosed in Patent Document 2, the use of a leaf spring is effective when there is not enough space to place a compression coil spring as an inclination-increasing spring of the swash plate. There are the following problems.
(1) Although the leaf spring is engaged with a groove formed in the drive shaft and fixed to the drive shaft as shown in Patent Document 2, there is a risk of dropping if the engagement is insufficient. If it falls off, the compressor may be damaged. In particular, when the drive shaft rotates at high speed, the risk of dropping off increases due to the centrifugal force.
(2) A structure in which the leaf spring is fixed to the drive shaft and does not rotate relative to the drive shaft is required. However, the structure for this tends to be complicated, the assembly becomes complicated, and the factor of deterioration in productivity. It becomes.
(3) In the structure as disclosed in Patent Document 2, since the position where the leaf spring contacts the sleeve is biased, the urging force of the leaf spring does not act uniformly on the end surface extending in the circumferential direction of the sleeve, If the sleeve is tilted with respect to the drive shaft, the movement of the sleeve may be hindered, and the tilt angle of the swash plate may not change smoothly.

  Accordingly, the object of the present invention is to focus on the above-mentioned problems in the prior art, and can be biased substantially uniformly and stably without tilting the swash plate (or sleeve), and can be easily fixed to the drive shaft. It is another object of the present invention to provide a variable capacity compressor having an urging means for increasing the tilt angle of the swash plate without risk of falling off.

  In order to solve the above problems, a variable capacity compressor according to the present invention includes a housing in which a discharge chamber, a suction chamber, a crank chamber, and a cylinder bore are defined, a piston disposed in the cylinder bore, and the housing A pressure difference between the crank chamber and the suction chamber, and a conversion mechanism including a drive shaft rotatably supported in the shaft and a conversion mechanism including a swash plate having a variable tilt angle for converting the rotation of the drive shaft into a reciprocating motion of the piston. In a variable capacity compressor that adjusts the stroke of the piston by changing the pressure to compress the fluid sucked into the cylinder bore from the suction chamber and discharge the compressed fluid into the discharge chamber, the variable displacement compressor is disposed so as to surround the periphery of the drive shaft A plurality of urging means for urging the swash plate in the direction of increasing the inclination angle, and an annular shape surrounding the periphery of the drive shaft, and connecting the plurality of urging means A connecting means that a rotation preventing means for said coupling means to said drive shaft is prevented from relative rotation comprise those characterized by having an integrated biasing member formed integrally.

  In such a variable capacity compressor, the urging means, the coupling means, and the rotation preventing means are integrally formed and formed as an integrated urging member. Therefore, the integrated urging member is attached to the drive shaft. As long as it is mounted at a predetermined position, the biasing means and the rotation prevention means are arranged at the predetermined position. Therefore, it becomes easy to fix and attach the biasing means to a predetermined position with respect to the drive shaft, which contributes to an improvement in assembly and productivity as the whole compressor. In addition, since the connecting means is formed in an annular shape so as to surround the periphery of the drive shaft, the biasing means connected by the connecting means does not fall off from the drive shaft, and a problem due to the dropout occurs. Thus, the reliability of the compressor is ensured. Further, since the plurality of urging means are arranged so as to surround the periphery of the drive shaft, the swash plate is stabilized without the urging means being biased against the mating member or tilting the mating member. Therefore, the tilt angle of the swash plate can be changed smoothly.

  In the variable capacity compressor according to the present invention, the plurality of urging means are made of leaf springs, and the leaf springs are formed by press molding from a leaf spring forming plate that forms a leaf spring, for example. It can be set as the structure by which the said connection means and the said rotation prevention means are formed in the remainder other than the said leaf | plate spring of a formation board. In such a configuration, the predetermined integrated biasing member can be manufactured relatively easily, which can contribute to a reduction in the manufacturing cost of the entire compressor.

  Further, the following structure can be adopted as a structure for preventing the integral urging member from rotating with respect to the drive shaft. That is, a plurality of flat portions are formed on the outer peripheral surface of the drive shaft, and the rotation prevention means is arranged corresponding to the plurality of flat portions, and the base end portion of each rotation prevention means is the above-mentioned A structure having a spring structure that is connected to the connecting means and that has a distal end abutting on the flat part (preferably abutting with a predetermined width) to press the flat part can be employed. In such a structure, since the tip portion of the rotation prevention means is a rotation prevention structure that presses a flat portion formed on the drive shaft by a spring force, the integrated biasing member rotates relative to the drive shaft. The function of preventing this can be stably exhibited, and accordingly, the connecting means can be reliably held on the drive shaft. That is, the integrated urging member is stably held at a predetermined position of the drive shaft.

  In addition, it is preferable that the plurality of flat portions are formed at 2 to 4 locations at equal intervals around the drive shaft. By arranging a plurality of flat portions at equal intervals, the rotation prevention function is further stabilized, and the connecting means can be reliably held by the drive shaft.

  The variable capacity compressor according to the present invention is further formed in an annular shape so as to surround the periphery of the drive shaft, and is disposed adjacent to the connecting means of the integrated biasing member, Positioning means for positioning the integrated urging member in the axial direction of the drive shaft may be employed. In such a configuration, the urging force of the urging means can be adjusted by changing the thickness of the spacer. For example, it is possible to set the urging force to an optimum value according to the model.

  The integrated urging member may further define a mechanical minimum inclination angle of the swash plate, one end of which is formed so as to be able to contact the swash plate and the other end is connected to the connecting means. It can be set as the structure provided with the minimum inclination angle regulation means. As described above, the configuration in which the minimum inclination defining means is provided in the integrated urging member results in a structure in which the minimum inclination defining means and the urging means are integrally connected via the connecting means. It becomes possible to adjust the urging force of the urging means on the basis of the tilt angle, and to reduce variations in the urging force of the urging means. Further, since the minimum inclination angle defining means can also serve as a regulating means for regulating excessive deflection of the biasing means (that is, it can also serve as a stopper for regulating excessive deflection of the biasing means), Excessive stress does not act on the biasing means, which can contribute to ensuring the reliability of the biasing means.

  The urging means may urge the swash plate directly, or may urge it through a swash plate support. That is, a swash plate support that is slidably inserted in the axial direction with respect to the drive shaft and supports the swash plate is provided, and the urging means is configured to increase the tilt angle of the swash plate through the swash plate support. It can also be set as the structure comprised so that it might bias. In such a structure, the urging force of the plurality of urging means acts almost uniformly on the end face of the swash plate support, and the moment for tilting the swash plate support with respect to the drive shaft does not act. The body can smoothly slide on the drive shaft.

  The variable capacity compressor according to the present invention is particularly suitable when the fluid to be compressed is composed of a refrigerant, and is particularly suitable as a compressor used in a vehicle air conditioner.

  According to the variable capacity compressor of the present invention, at least the urging means, the connecting means, and the rotation preventing means are formed as an integrated member, so that the integrated urging member is simply mounted on the drive shaft. Thus, the plurality of urging means can be arranged at a predetermined position very easily, and assemblability and productivity can be greatly improved. Also, since the plurality of urging means are connected by a connecting means formed in an annular shape so as to surround the periphery of the drive shaft, the urging means does not fall off from the drive shaft, ensuring the reliability of the compressor. it can. Further, since a plurality of urging means are arranged so as to surround the periphery of the drive shaft, the urging means can urge the swash plate side almost uniformly and stably, and smoothly change the inclination angle of the swash plate. be able to. As a result, a variable capacity compressor with desirable performance can be realized at a low cost and with a simple assembling operation by applying an integrated biasing member having a simple structure.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a variable capacity swash plate compressor 100 (FIG. 1A) for compressing a refrigerant incorporated in a vehicle air conditioner as a variable capacity compressor according to an embodiment of the present invention, and for controlling the capacity thereof. The capacity control valve (FIG. 1B) is shown. In FIG. 1, a variable capacity swash plate compressor 100 includes a cylinder block 101 having a plurality of cylinder bores 101 a, a front housing 102 provided at one end of the cylinder block 101, and other cylinder blocks 101 via a valve plate 103. And a rear housing 104 provided at the end.

  A drive shaft 106 is disposed across the crank chamber 105 defined by the cylinder block 101 and the front housing 102. The drive shaft 106 is inserted through the swash plate 107. The swash plate 107 is coupled to a rotor 108 fixed to the drive shaft 106 via a connecting portion 109, and is supported so as to be able to rotate together with the drive shaft 106 and to change the tilt angle with respect to the drive shaft 106. A coil spring 110 is disposed between the rotor 108 and the swash plate 107 to urge the swash plate 107 in the direction of decreasing the tilt angle. On the opposite side of the coil spring 110 across the swash plate 107, a leaf spring is provided as a biasing means for biasing the swash plate 107 in the minimum tilted state in the tilt increasing direction so as to surround the periphery of the drive shaft 106. An integrated biasing member 111 according to the present invention is disposed. The integrated biasing member 111 is formed in an annular shape so as to surround the periphery of the drive shaft 106 and a plurality of leaf spring portions 111a as biasing means for biasing the swash plate 107 in the direction of increasing the tilt angle, as will be described later. A connecting portion 111d as connecting means for connecting the plurality of leaf spring portions 111a, a rotation preventing portion 111c as rotation preventing means for preventing the connecting portion 111d from rotating relative to the drive shaft 106, and a swash plate A stopper portion 111b as a minimum inclination angle defining means capable of defining a mechanical minimum inclination angle 107 is integrally formed.

  One end of the drive shaft 106 extends to the outside of the housing through the boss portion 102a of the front housing 102, and is connected to a drive source such as a vehicle engine (not shown) via a belt or the like via a power transmission device (not shown). ing. A shaft seal device 112 is disposed between the drive shaft 106 and the boss portion 102a. The drive shaft 106 is supported in the radial direction and the thrust direction by bearings 113, 114, 115, and 116.

  A piston 117 is disposed in the cylinder bore 101a, and a pair of shoes 118 housed in a recess 117a at one end of the piston 117 sandwich the outer peripheral portion of the swash plate 107 so as to be slidable relative to each other. The rotation of the drive shaft 106 is converted into a reciprocating motion of the piston 117 via the swash plate 107 and the shoe 118.

  A suction chamber 119 and a discharge chamber 120 are formed in the rear housing 104. The suction chamber 119 communicates with the cylinder bore 101a via a suction hole 103a formed in the valve plate 103 and a suction valve (not shown), and the discharge chamber 120 includes a discharge valve (not shown) and a discharge hole 103b formed in the valve plate 103. Is communicated with the cylinder bore 101a. The suction chamber 119 is connected to an evaporator of a vehicle air conditioner (not shown) through a suction port 104a.

  Front housing 102, cylinder block 101, valve plate 103, and rear housing 104 cooperate to drive shaft 106, rotor 108, connecting portion 109, swash plate 107, shoe 118, piston 117, cylinder bore 101a, intake valve, discharge valve. A housing for accommodating a compression mechanism formed by a valve or the like is formed.

  A muffler 121 is disposed outside the cylinder block 101. The muffler 121 is formed by joining a bottomed cylindrical lid member 122 separate from the cylinder block 101 to a cylindrical wall 101b erected on the outer surface of the cylinder block 101 via a seal member. . A discharge port 122 a is formed in the lid member 122. The discharge port 122a is connected to a condenser of a vehicle air conditioner (not shown).

  A communication passage 123 that allows the muffler 121 to communicate with the discharge chamber 120 is formed across the cylinder block 101, the valve plate 103, and the rear housing 104. The muffler 121 and the communication passage 123 form a discharge passage extending between the discharge chamber 120 and the discharge port 122a, and the muffler 121 forms an expansion space arranged in the middle of the discharge passage. Yes. A check valve 200 for opening and closing the inlet of the muffler 121 is disposed in the muffler 121.

  The front housing 102, the cylinder block 101, the valve plate 103, and the rear housing 104 are adjacent to each other via a gasket (not shown), and are integrally assembled using a plurality of through bolts 130.

  A capacity control valve 300 is attached to the rear housing 104. The capacity control valve 300 adjusts the opening of the communication passage 124 between the discharge chamber 120 and the crank chamber 105, and controls the amount of refrigerant gas discharged into the crank chamber 105. The refrigerant gas in the crank chamber 105 is sucked through a gap between the bearings 115 and 116 and the drive shaft 106, a space 125 formed in the cylinder block 101, and an orifice hole 103 c formed in the valve plate 103. Flows into chamber 119.

  By changing the internal pressure of the crank chamber 105 by the capacity control valve 300, the discharge capacity of the variable capacity swash plate compressor 100 can be variably controlled. The capacity control valve 300 adjusts the energization amount to the built-in solenoid based on the external signal, and the internal pressure of the suction chamber 119 introduced into the pressure sensing chamber of the capacity control valve 300 via the communication path 126 becomes a predetermined value. As described above, the discharge capacity of the variable capacity swash plate compressor 100 is variably controlled, and the communication path 124 is forcibly opened by turning off the energization of the built-in solenoid. Control to the minimum. The capacity control valve 300 can optimally control the suction pressure according to the external environment.

  As shown in FIG. 2, the capacity control valve 300 is formed in the valve housing 301 and has a first pressure sensing chamber 302 communicating with the crank chamber 105 through the communication hole 301 a, and one end opened to the first pressure sensing chamber 302. The valve hole 301c having the other end opened to the valve chamber 303 communicating with the discharge chamber 120 through the communication hole 301b, one end disposed in the valve chamber 303 opens and closes the valve hole 301c, and the other end is a support hole. A cylindrical valve body 304 slidably supported by 301d and the first pressure sensing chamber 302 are disposed, and the crank chamber pressure is received through the communication hole 301a, the inside is evacuated, and a spring is disposed. A bellows assembly 305 that functions as a pressure-sensitive means, a connection portion 306 in which the bellows assembly 305 is detachably connected to one end and the other end is fixed to one end of the valve body 304, and the other end of the valve body 304 is Via the communication hole 301e And a second pressure sensing chamber 307 which communicates with the entrance 119.

  The valve housing 301 is formed with a support hole 301d that slidably supports the other end portion of the valve body 304, and the valve body 304 is supported by the support hole 301d so as to be slidable with a minute gap. The other end is blocked from the valve chamber 303.

  The displacement control valve 300 further includes a solenoid rod 304a integrally formed with the valve body 304 and having a movable iron core 308 press-fitted and fixed to an end portion separated from the valve body 304, and the solenoid rod 304a inserted therein, and the movable iron core is separated by a predetermined gap. A fixed iron core 309 disposed opposite to the 308, a spring 310 disposed between the fixed iron core 309 and the movable iron core 308 and biasing the movable iron core 308 in the valve opening direction, and the fixed iron core 309 and the movable iron core 308 are connected to each other. A cylindrical member 312 made of a non-magnetic material that is inserted and fixed to the solenoid case 311, and an electromagnetic coil 313 that surrounds the cylindrical member 312 and is accommodated in the solenoid case 311.

Regarding the operation of the capacity control valve 300, the bellows effective area Sb of the bellows assembly 305, the pressure receiving area Sv of the crank chamber 105 received from the valve hole 301 c acting on the valve body 304, and the second pressure sensing chamber 307. Since the pressure receiving area Sr of the suction pressure acting on the valve body 304 is set to substantially the same value, the force acting on the valve body 304 is expressed by the equation (1).
Ps = [− (1 / Sb) · F (i) + (F + f) / Sb] (1)
here,
Ps: suction chamber pressure Sb: bellows effective area (= pressure receiving area of the crank chamber acting on the valve body (Sv) = pressure receiving area of the suction chamber acting on the valve body (Sr))
f: biasing force F of the spring 310: bellows biasing force F (i): electromagnetic force.

  Further, in the capacity control valve 300, when the suction chamber pressure Ps is lower than the value expressed by the equation (1), the bellows 305a extends, the valve body 304 moves away from the valve seat, and the valve hole 301c is opened. 1 The pressure sensing chamber 302 and the valve chamber 303 are communicated with each other via the valve hole 301c, and the communication passage 124 between the discharge chamber 120 and the crank chamber 105 is opened. The refrigerant in the discharge chamber 120 is supplied to the crank chamber 105 through the communication path 124, the crank chamber pressure increases, the inclination angle of the swash plate 107 decreases, the discharge capacity of the variable capacity compressor 100 decreases, and the suction chamber pressure. Rises. When the suction chamber pressure is higher than the value represented by the expression (1), the bellows of the bellows assembly 305 contracts, the valve body 304 comes into contact with the valve seat, closes the valve hole 301c, and the first pressure sensing chamber 302 Communication with the valve chamber 303 via the valve hole 301 c is blocked, and the communication path 124 between the discharge chamber 120 and the crank chamber 105 is closed. The refrigerant gas in the crank chamber 105 is sucked through the gaps between the bearings 115 and 116 and the drive shaft 106, the space 125 formed in the cylinder block 101, and the orifice hole 103 c formed in the valve plate 103. It flows into the chamber 119 and the crank chamber pressure decreases, the inclination angle of the swash plate 107 increases, the discharge capacity of the compressor 100 increases, and the suction chamber pressure decreases. A pressure-sensitive mechanism constituted by the bellows assembly 305, the connecting portion 306, and the valve body 304 autonomously controls the suction chamber pressure to a value represented by the formula (1). The electromagnetic actuator composed of the solenoid rod 304a, the movable iron core 308, the fixed iron core 309, the spring 310, the solenoid case 311, the cylindrical member 312 and the electromagnetic coil 313 is operated in accordance with the current value i flowing through the electromagnetic coil 313. Change the operating point.

  In the capacity control valve 300, a control characteristic is obtained in which the suction chamber pressure decreases as the energization amount i to the electromagnetic coil 313 increases. In the capacity control valve 300, the pressure sensing mechanism and the electromagnetic actuator drive the valve body 304. Since the capacity control valve 300 has a pressure sensing mechanism, the control accuracy of the suction chamber pressure is improved, and by having an electromagnetic actuator that changes the operating point of the pressure sensing mechanism, the control current i is uniquely controlled. It becomes possible to determine the suction chamber pressure.

  Further, when the energization to the solenoid is turned off, the valve body 304 opens the valve hole 301c by the biasing force of the spring 310, and the refrigerant in the discharge chamber 120 is supplied to the crank chamber 105 through the communication passage 124, and the crank chamber pressure is increased. Increases, the inclination angle of the swash plate 107 decreases, and the discharge capacity of the variable capacity compressor 100 is minimized.

Next, the integrated urging member 111 having a leaf spring as urging means will be described with reference to FIGS.
In this embodiment, the integrated urging member 111 is disposed so as to surround the drive shaft 106 as a whole, and includes a plurality of leaf spring portions 111a as urging means for urging the swash plate 107 in the direction of increasing the inclination angle. The connection portion 111d is formed in an annular shape so as to surround the drive shaft 106 and serves as a connection means for connecting the plurality of leaf spring portions 111a, and the connection portion 111d is prevented from rotating relative to the drive shaft 106. The rotation prevention unit 111c as the rotation prevention unit and the stopper unit 111b as the minimum inclination defining unit capable of defining the mechanical minimum inclination of the swash plate 107 are configured as a single member. More specifically, the integrated urging member 111 includes three leaf spring portions 111a, three stopper portions 111b, three rotation blocking portions 111c, and a connecting portion 111d formed in an annular shape for connecting them. They are connected together. The integrated urging member 111 is formed from a leaf spring forming plate by press molding, and a stopper portion 111b, a rotation preventing portion 111c, and a connecting portion 111d are formed in the remaining portion other than the leaf spring portion 111a.

  When the distal end side of the leaf spring portion 111a comes into contact with the swash plate 107, a biasing force that biases the swash plate 107 in the direction of increasing the tilt angle acts. The three leaf spring portions 111a are arranged at substantially equal intervals around the drive shaft 106 in order to urge the swash plate 107 stably and substantially uniformly. In addition, when the swash plate 107 is brought into contact with the tip of the stopper portion 111b, the minimum inclination angle of the swash plate 107 that is mechanically regulated is defined.

  As shown in FIG. 5A, flat portions 106a corresponding to the three rotation blocking portions 111c are formed around the drive shaft 106 (outer peripheral surface), and the inner diameter side of the connecting portion 111d is the drive shaft 106. And the rotation preventing portion 111c is locked to the flat portion 106a. The rotation preventing portion 111c is a leaf spring that presses the flat portion 106a of the drive shaft 106, and substantially makes surface contact with a predetermined width along the flat portion 106a so as to prevent relative rotation with respect to the drive shaft 106. It is formed as follows. The three rotation preventing portions 111c are arranged at substantially equal intervals so as to stably hold the integrated biasing member 111.

  In this embodiment, as shown in FIGS. 4 and 5B, the integral biasing member 111 is axially moved by the snap ring 150 via the annular spacer 140 disposed adjacent to the connecting portion 111d. It is positioned. Accordingly, by changing the thickness of the spacer 140, the urging force of the leaf spring portion 111a can be adjusted. At the same time, the minimum inclination angle of the swash plate 107 can be adjusted.

  The minimum inclination angle of the swash plate 107 is, for example, an angle (θmin) in the vicinity of 0 ° when the state in which the surface of the swash plate 107 is orthogonal to the axis of the drive shaft 106 is 0 °. The height in the axial direction of the stopper portion 111b is set.

  Further, since the stopper portion 111b and the leaf spring portion 111a are integrally connected via the connecting portion 111d, the height (h) of the distal end of the leaf spring portion 111a from the distal end portion of the stopper portion 111b (FIG. 3B). And the variation in the urging force of the leaf spring portion 111a is reduced. In addition, since the stopper part 111b serves as the control means which controls the excessive bending of the leaf | plate spring part 111a, an excessive stress does not act on the leaf | plate spring part 111a.

When the swash plate 107 becomes smaller than a predetermined inclination angle θ ₁ , the swash plate 107 is sandwiched between the coil spring 110 and the leaf spring 111, and the resultant force of both springs urges the swash plate 107 in the inclination increasing direction when the inclination angle θ ₂ or less as shown in FIG. When an urging force is applied and exceeds θ ₂ , an urging force is applied to urge the swash plate 107 in the direction of decreasing the tilt angle. Since the urging force by the integrated urging member 111 is a resultant force of the urging forces of the plurality of leaf spring portions 111a, the urging force can be adjusted by changing the number of leaf spring portions 111a.

  As described above, at least three leaf spring portions 111a capable of stably and almost uniformly biasing the swash plate 107 in the direction of increasing the tilt angle and the three rotation preventing portions 111c are the connecting portions 111d as connecting means. Therefore, the plurality of leaf spring portions 111a can be easily positioned at a predetermined position simply by mounting the integrated biasing member 111 to the drive shaft 106. As a result, assembly and productivity can be greatly improved. Since the connecting portion 111d is formed in an annular shape so as to surround the periphery of the drive shaft 106, the integrated urging member 111 does not fall off the drive shaft 106, and the reliability of the compressor 100 can be ensured. Further, since the three stopper portions 111b are also integrally provided in the integrated biasing member 111, adjustment of the biasing force of the leaf spring portion 111a, adjustment of the minimum inclination angle of the swash plate 107, and leaf spring portion can be easily performed. It is possible to reduce variation in the biasing force of 111a and restrict excessive bending of the leaf spring portion 111a.

  In the above embodiment, the leaf spring portion 111a is formed in the circumferential direction of the drive shaft 106, but the formation of the leaf spring portion 111a is not limited to this. For example, the leaf spring portion 111 a may be formed such that the tip end portion is directed toward the axis of the drive shaft 106 or may be formed in a direction away from the drive shaft 106.

  Moreover, in the said embodiment, although the rotation prevention part rotation prevention part 111c was three places, two places or four places may be sufficient. In the case of two places, it is desirable to arrange them at positions facing each other in order to stably hold them.

  In the above embodiment, the case where the leaf spring portion 111a directly urges the swash plate 107 has been described. For example, as shown in FIG. In the case of a structure including a swash plate support 160 (sleeve) that supports the swash plate 107, the plate spring portion 111 a of the integrated biasing member 111 attaches the swash plate 107 to the inclination increasing direction via the swash plate support 160. It can also be configured to support. In such a structure, the urging force of the plurality of leaf spring portions 111 a acts almost uniformly on the end face of the swash plate support 160, and the moment for tilting the swash plate support 160 with respect to the drive shaft 106 does not act. The swash plate support 160 can smoothly slide on the drive shaft 106.

  Although not shown, the present invention can also be applied to an oscillating plate type variable displacement compressor provided with an oscillating plate that does not rotate with the drive shaft 106 in addition to the swash plate 107 as described above.

  In addition, the present invention can be applied to a variable capacity compressor or a clutchless compressor equipped with an electromagnetic clutch, or a variable capacity compressor driven by a motor, for example, a variable capacity compressor with a built-in motor. You can also

  Furthermore, in the said embodiment, although the case where the to-be-compressed fluid was a refrigerant | coolant was demonstrated, another to-be-compressed fluid may be sufficient. In addition, the type of refrigerant as the fluid to be compressed is not particularly limited, and the present invention is commonly applied to variable capacity compressors corresponding to carbon dioxide and other new refrigerants in addition to the case of using R134a as the refrigerant. Is possible.

  The variable capacity compressor according to the present invention can be applied to any compressor having a swash plate with a variable tilt angle, and is particularly suitable as a variable capacity compressor used in a vehicle air conditioner.

It is a longitudinal cross-sectional view (FIG. 1 (A)) of the variable capacity compressor which concerns on one embodiment of this invention, and sectional drawing (FIG. 1 (B)) of the capacity | capacitance control valve for controlling the capacity | capacitance. FIG. 2 is an enlarged vertical sectional view of the capacity control valve shown in FIG. 1. FIG. 2 shows an integrated urging member in the variable capacity compressor of FIG. 1, (A) is a front view of the member, (B) is a view taken in the direction of arrow A in FIG. 3 (A), and (C) is FIG. A arrow B view of (A), (D) is CC sectional drawing of FIG. 3 (A). It is a side view which shows an example of the mounting state to the drive shaft of the integrated biasing member of FIG. 3A and 3B show examples of the mounting state of the integrated urging member of FIG. 3 on the drive shaft. FIG. 5A is a front view when there is no spacer, and FIG. It is sectional drawing which follows the DD line. FIG. 6 is a relationship diagram between a resultant force of a coil spring and a leaf spring and a swash plate inclination angle. It is a side view of the integrated biasing member mounting part in the structure which has a swash plate support body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Variable capacity compressor 101 Cylinder block 101a Cylinder bore 102 Front housing 103 Valve plate 104 Rear housing 105 Crank chamber 106 Drive shaft 106a Flat part 107 Swash plate 108 Rotor 109 Connecting part 110 Coil spring 111 Integrated urging member 111a As urging means Leaf spring portion 111b Stopper portion 111c as minimum inclination defining means Rotation prevention portion 111d as rotation prevention means Connection portion 117 as connection means Piston 118 Shoe 119 Suction chamber 120 Discharge chamber 121 Muffler 122 Lid member 123 Communication path 130 Through bolt 140 Spacer 150 Snap ring 160 Swash plate support 200 Check valve 300 Capacity control valve 301 Valve housing 302 First pressure sensing chamber 303 Valve chamber 304 Valve body 304a Solenoid rod 05 bellows assembly 307 second pressure sensing chamber 308 movable core 309 fixed core 311 solenoid case 313 electromagnetic coil

Claims (9)

  A housing in which a discharge chamber, a suction chamber, a crank chamber and a cylinder bore are defined, a piston disposed in the cylinder bore, a drive shaft rotatably supported in the housing, and rotation of the drive shaft A conversion mechanism including a swash plate with variable tilt angle that converts the piston into a reciprocating motion, and adjusting the stroke of the piston by changing a pressure difference between the crank chamber and the suction chamber from the suction chamber. In a variable capacity compressor that compresses fluid sucked into a cylinder bore and discharges the fluid into the discharge chamber, a plurality of urging means are disposed so as to surround the drive shaft and urge the swash plate in an inclination increasing direction. And a connecting means for connecting the plurality of biasing means, and the connecting means relative to the drive shaft. Variable displacement compressor and rotation preventing means for preventing Rukoto is characterized by having an integrated biasing member formed integrally.   The plurality of urging means comprises a leaf spring, and the leaf spring is formed by press molding from a leaf spring forming plate that forms the leaf spring, and the connecting means and the remaining portion other than the leaf spring of the leaf spring forming plate The variable capacity compressor according to claim 1, wherein the rotation preventing means is formed.   A plurality of flat portions are formed on the outer peripheral surface of the drive shaft, and the rotation prevention means is disposed corresponding to the plurality of flat portions, and a base end portion of each rotation prevention means is the connecting means. The variable capacity compressor according to claim 1, wherein the compressor has a spring structure that is coupled to the front end and presses the flat portion by abutting the flat portion.   4. The variable capacity compressor according to claim 3, wherein the plurality of flat portions are formed at two or four locations around the drive shaft at equal intervals.   And a spacer that is annularly formed so as to surround the periphery of the drive shaft and is disposed adjacent to the connecting means of the integrated biasing member, and the integrated biasing member is connected to the drive shaft via the spacer. The variable capacity compressor according to any one of claims 1 to 4, further comprising positioning means for positioning in the axial direction.   The integrated biasing member has minimum inclination defining means capable of defining a mechanical minimum inclination angle of the swash plate, one end of which is formed so as to be able to contact the swash plate and the other end is connected to the connecting means. The variable capacity compressor according to claim 1, which is provided.   A swash plate support is inserted into the drive shaft so as to be slidable in the axial direction, and supports the swash plate, and the urging means attaches the swash plate to the inclination increasing direction via the swash plate support. The variable capacity compressor according to any one of claims 1 to 6, wherein the variable capacity compressor is configured to support.   The variable capacity compressor according to claim 1, wherein the fluid to be compressed is made of a refrigerant.   The variable capacity compressor according to any one of claims 1 to 8, which is used in a vehicle air conditioner.

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