JP2015175350A - variable displacement swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable displacement swash plate type compressor capable of smoothly changing the inclination angle of a swash plate.SOLUTION: When a swash plate 23 is not rotated, each connection pin 43 is supported to the swash plate 23 so that the positions of contact portions capable of contacting with a guide surface 32g in each connection pin 43 are mutually deviated in a direction where rotational axis line L of a rotational shat extends. Consequently, until each connection pin 43 and a pair of guide surface 32a are contacted with each other, rotation in a direction different from change of the inclination angle of the swash plate 23 in the swash plate 23 is allowed.

Description

  The present invention relates to a variable displacement swash plate compressor.

  As this type, for example, Patent Document 1 discloses a movable body that moves along the axial direction of the rotation shaft in order to change the inclination angle of the swash plate on which the piston is anchored. The moving body and the swash plate are connected by a connecting pin. The moving body is movable in the axial direction of the rotation shaft by changing the pressure inside the control pressure chamber as the control gas is introduced into the control pressure chamber formed in the housing. . As the moving body moves in the axial direction of the rotating shaft, a force that causes the inclination angle of the swash plate to change with respect to the swash plate is transmitted from the moving body to the swash plate via the connecting pin. The tilt angle is changed, and the stroke of the piston is changed to change the discharge capacity.

JP-A-5-172052

  By the way, in the variable capacity swash plate compressor, a compression force acts on the swash plate from the piston. This compression force causes the swash plate to rotate in a direction different from the change in the inclination of the swash plate, with the line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate as the rotation center. May end up. If the swash plate rotates in a direction different from the change in the tilt angle of the swash plate, the moving body may also rotate in a direction different from the change in the tilt angle of the swash plate via the connecting pin. . If the moving body rotates in a direction different from the change in the tilt angle of the swash plate, for example, the sliding resistance increases between the moving body and the rotating shaft, so that the moving body becomes the axis of the rotating shaft. It becomes difficult to move smoothly in the direction. As a result, the inclination angle of the swash plate cannot be changed smoothly.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a variable displacement swash plate compressor that can smoothly change the inclination angle of the swash plate.

  A variable capacity swash plate compressor that solves the above problems includes a suction chamber, a discharge chamber, a swash plate chamber that communicates with the suction chamber, a housing having a cylinder bore, and a rotating shaft that is rotatably supported by the housing; A swash plate that can be rotated in the swash plate chamber by rotation of the rotation shaft, and a change in an inclination angle of the swash plate with respect to a direction orthogonal to the rotation axis of the rotation shaft provided between the rotation shaft and the swash plate. A link mechanism that allows reciprocation in the cylinder bore, a conversion mechanism that causes the piston to reciprocate within the cylinder bore with a stroke corresponding to the tilt angle by rotation of the swash plate, and the tilting mechanism. An actuator disposed in the board chamber and capable of changing the tilt angle; and a control mechanism for controlling the actuator, wherein the actuator is provided on the rotating shaft. An image body, and a movable body that is connected to the swash plate through a connecting mechanism and is movable in the direction in which the rotation axis of the rotary shaft extends in the swash plate chamber, and is partitioned by the partition body and the movable body; A variable displacement swash plate compressor having a control pressure chamber for moving the moving body by introducing refrigerant from the discharge chamber, wherein the coupling mechanism includes a swash plate arm formed on the swash plate; A movable body arm formed on the movable body, and a connecting member provided between the swash plate arm and the movable body arm, and either the swash plate arm or the movable body arm, The connecting member is guided, and the tilt angle is changed as the moving body moves in the direction in which the rotation axis of the rotation shaft extends, and a pair of guide surfaces set across the rotation axis of the rotation shaft is formed. The other is the connecting member The connecting member and the pair of guide surfaces are supported when the swash plate rotates around a line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate. The inclination angle of the swash plate is changed by the contact.

  When a compressive force is applied from the piston to the swash plate, the swash plate is caused by this compressive force around the line connecting the piston top dead center corresponding portion and the bottom dead center corresponding portion in the swash plate. It rotates in a direction different from the change of the tilt angle. At this time, until the connecting member comes into contact with the pair of guide surfaces, rotation in a direction different from the change of the inclination angle of the swash plate in the swash plate is allowed. It can suppress that it rotates in the direction different from the change of the inclination-angle of a board. As a result, the inclination angle of the swash plate can be changed smoothly.

  In the variable displacement swash plate compressor, two connecting members are provided between the swash plate arm and the movable body arm, and the piston has a top dead center corresponding portion and a lower portion corresponding to the piston. When the swash plate is not rotating around the line connecting the dead center corresponding portion, the pair of guide surfaces are positioned at the same position in the direction in which the rotation axis of the rotation shaft extends. It is formed on either the plate arm or the movable body arm, and the position of the contact portion that can contact the guide surface in each connecting member is shifted from each other in the direction in which the rotation axis of the rotation shaft extends. Thus, it is preferable that each connecting member is supported by either the swash plate arm or the movable body arm.

  According to this, when the swash plate is not rotating, the positions of the contact parts that can come into contact with the guide surface in each connecting member are shifted from each other in the direction in which the rotation axis of the rotating shaft extends. Until the pair of guide surfaces come into contact with each other, rotation in a direction different from the change of the inclination angle of the swash plate in the swash plate is allowed. Therefore, the moving body rotates in a direction different from the change of the inclination angle of the swash plate through each connecting member only by adjusting the arrangement position of each connecting member with respect to either the swash plate arm or the moving body arm. Can be suppressed.

  In the variable displacement swash plate compressor, when the swash plate does not rotate about a line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate, Each connecting member is placed on the other of the swash plate arm or the movable body arm such that the position of the contact portion of the member that can contact the guide surface is the same in the direction in which the rotation axis of the rotation shaft extends. And the pair of guide surfaces are formed on either the swash plate arm or the movable body arm so as to be shifted from each other in the direction in which the rotation axis of the rotation shaft extends. Is preferred.

  According to this, when the swash plate is not rotating, the pair of guide surfaces are displaced from each other in the direction in which the rotation axis of the rotation shaft extends, so that the connection member and the pair of guide surfaces are in contact with each other. The swash plate is allowed to rotate in a direction different from the change of the inclination angle of the swash plate. Therefore, the moving body rotates in a direction different from the change of the inclination angle of the swash plate via the connecting member only by adjusting the formation position of the pair of guide surfaces with respect to either the swash plate arm or the moving body arm. Can be suppressed.

  In the variable capacity swash plate type swash plate compressor, when the swash plate is not rotating around the line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate, The pair of guide surfaces are formed on either the swash plate arm or the movable body arm so as to be at the same position in the direction in which the rotation axis of the rotation shaft extends, and the connecting member is It is preferable that the plate is supported by the other of the swash plate arm and the movable body arm in an inclined state with respect to the surface of the movable body side of the plate.

  According to this, when the swash plate is not rotating, the connecting member is inclined with respect to the surface of the swash plate on the moving body side, so that the swash plate is not contacted until the connecting member and the pair of guide surfaces come into contact with each other. Rotation in a direction different from the change of the inclination angle of the swash plate is allowed. Therefore, it is possible to prevent the moving body from rotating in a direction different from the change of the inclination angle of the swash plate via the connecting member only by adjusting the inclination of the connecting member with respect to the surface of the swash plate on the moving body side. Can do.

  According to this invention, the inclination angle of the swash plate can be changed smoothly.

1 is a side sectional view showing a variable capacity swash plate compressor according to a first embodiment. The schematic diagram which shows the relationship between a control pressure chamber, a pressure regulation chamber, a suction chamber, and a discharge chamber. FIG. 6 is a plan sectional view showing a state before the swash plate is rotated in a direction different from the change of the inclination angle of the swash plate by the compressive force. The sectional side view which shows a variable capacity | capacitance type swash plate type compressor when the inclination of a swash plate is the minimum inclination. FIG. 4 is a plan sectional view showing a state in which the swash plate is rotated in a direction different from the change in the inclination angle of the swash plate by a compressive force. The plane sectional view which shows the state before a swash plate rotates in the direction different from the change of the inclination-angle of a swash plate with the compressive force in 2nd Embodiment. FIG. 4 is a plan sectional view showing a state in which the swash plate is rotated in a direction different from the change in the inclination angle of the swash plate by a compressive force. FIG. 12 is a plan sectional view showing a state before the swash plate is rotated in a direction different from the change in the inclination angle of the swash plate by the compression force in the third embodiment. FIG. 4 is a plan sectional view showing a state in which the swash plate is rotated in a direction different from the change in the inclination angle of the swash plate by a compressive force. The plane sectional view showing the state before a swash plate rotates in the direction different from change of the inclination of a swash plate by compressive force in a 4th embodiment. FIG. 4 is a plan sectional view showing a state in which the swash plate is rotated in a direction different from the change in the inclination angle of the swash plate by a compressive force.

(First embodiment)
A first embodiment that embodies a variable displacement swash plate compressor will be described below with reference to FIGS. The variable capacity swash plate compressor is used in a vehicle air conditioner.

  As shown in FIG. 1, the housing 11 of the variable capacity swash plate compressor 10 includes a first cylinder block 12 and a second cylinder block 13 joined together, and a first cylinder block 12 on the front side (one side). The front housing 14 is joined, and the rear housing 15 is joined to the second cylinder block 13 on the rear side (the other side).

  A first valve / port forming body 16 is interposed between the front housing 14 and the first cylinder block 12. A second valve / port forming body 17 is interposed between the rear housing 15 and the second cylinder block 13.

  A suction chamber 14 a and a discharge chamber 14 b are defined between the front housing 14 and the first valve / port forming body 16. The discharge chamber 14b is disposed on the outer peripheral side of the suction chamber 14a. A suction chamber 15 a and a discharge chamber 15 b are defined between the rear housing 15 and the second valve / port forming body 17. Further, the rear housing 15 is formed with a pressure adjusting chamber 15c. The pressure adjustment chamber 15c is located at the center of the rear housing 15, and the suction chamber 15a is disposed on the outer peripheral side of the pressure adjustment chamber 15c. Further, the discharge chamber 15b is disposed on the outer peripheral side of the suction chamber 15a. The discharge chambers 14b and 15b are connected to each other via a discharge passage (not shown). The discharge passage is connected to an external refrigerant circuit (not shown). Each discharge chamber 14b, 15b is a discharge pressure area.

  The first valve / port forming body 16 is formed with a suction port 16a communicating with the suction chamber 14a and a discharge port 16b communicating with the discharge chamber 14b. The second valve / port forming body 17 is formed with a suction port 17a communicating with the suction chamber 15a and a discharge port 17b communicating with the discharge chamber 15b. Each suction port 16a, 17a is provided with a suction valve mechanism (not shown), and each discharge port 16b, 17b is provided with a discharge valve mechanism (not shown).

  A rotating shaft 21 is rotatably supported in the housing 11. In the rotary shaft 21, one end side along the direction in which the rotary axis L extends (the axial direction of the rotary shaft 21), and the front end portion located on the front side (one side) of the housing 11 is connected to the first cylinder block 12. The shaft hole 12h is inserted therethrough. The front end of the rotating shaft 21 is located in the front housing 14. Further, in the rotating shaft 21, the other end side along the direction in which the rotating axis L extends, and the rear end portion side located on the rear side (the other side) of the housing 11 penetrates the second cylinder block 13. The shaft hole 13h is inserted. The rear end of the rotary shaft 21 is located in the pressure adjustment chamber 15c.

  The rotary shaft 21 has a front end portion rotatably supported by the first cylinder block 12 via the shaft hole 12h and a rear end portion side rotatably supported by the second cylinder block 13 via the shaft hole 13h. ing. A lip seal type shaft seal device 22 is interposed between the front housing 14 and the rotary shaft 21. A vehicle engine as an external drive source is operatively connected to the front end of the rotating shaft 21 via a power transmission mechanism (not shown). In the present embodiment, the power transmission mechanism is a constant transmission type clutchless mechanism (for example, a combination of a belt and a pulley).

  A swash plate chamber 24 defined by the first cylinder block 12 and the second cylinder block 13 is formed in the housing 11. The swash plate chamber 24 accommodates a swash plate 23 that rotates by obtaining a driving force from the rotary shaft 21 and can tilt in the axial direction with respect to the rotary shaft 21. The swash plate 23 is formed with an insertion hole 23a through which the rotary shaft 21 can pass. And the swash plate 23 is attached to the rotating shaft 21 because the rotating shaft 21 passes the penetration hole 23a.

  In the first cylinder block 12, a plurality of first cylinder bores 12a as cylinder bores formed so as to penetrate in the axial direction of the first cylinder block 12 are arranged around the rotation shaft 21 (only one first cylinder bore 12a is shown in FIG. 1). Has been. Each first cylinder bore 12a communicates with the suction chamber 14a via the suction port 16a and also communicates with the discharge chamber 14b via the discharge port 16b. In the second cylinder block 13, a plurality of second cylinder bores 13a as cylinder bores penetrating in the axial direction of the second cylinder block 13 are arranged around the rotation shaft 21 (only one second cylinder bore 13a is shown in FIG. 1). Has been. Each second cylinder bore 13a communicates with the suction chamber 15a via the suction port 17a and also communicates with the discharge chamber 15b via the discharge port 17b. The 1st cylinder bore 12a and the 2nd cylinder bore 13a are arranged so that it may become a pair in front and back. In the first cylinder bore 12a and the second cylinder bore 13a as a pair, a double-headed piston 25 as a piston is accommodated so as to be able to reciprocate in the front-rear direction. That is, the variable capacity swash plate compressor 10 of this embodiment is a double-headed piston swash plate compressor.

  Each double-headed piston 25 is anchored to the outer peripheral portion of the swash plate 23 via a pair of shoes 26. Then, the rotational motion of the swash plate 23 accompanying the rotation of the rotating shaft 21 is converted into the reciprocating linear motion of the double-headed piston 25 via the shoe 26. Therefore, the pair of shoes 26 is a conversion mechanism that causes the double-headed piston 25 to reciprocate within the paired first cylinder bore 12a and second cylinder bore 13a by the rotation of the swash plate 23. A first compression chamber 20a is defined in each first cylinder bore 12a by a double-headed piston 25 and a first valve / port forming body 16. In each second cylinder bore 13a, a second compression chamber 20b is defined by a double-headed piston 25 and a second valve / port forming body 17.

  The first cylinder block 12 is formed with a first large-diameter hole 12b that is continuous with the shaft hole 12h and has a larger diameter than the shaft hole 12h. The first large diameter hole 12 b communicates with the swash plate chamber 24. The swash plate chamber 24 and the suction chamber 14 a communicate with each other through a suction passage 12 c that passes through the first cylinder block 12 and the first valve / port forming body 16.

  The second cylinder block 13 is formed with a second large-diameter hole 13b that is continuous with the shaft hole 13h and has a larger diameter than the shaft hole 13h. The second large diameter hole 13 b communicates with the swash plate chamber 24. The swash plate chamber 24 and the suction chamber 15a communicate with each other through a suction passage 13c that passes through the second cylinder block 13 and the second valve / port forming body 17.

  A suction port 13 s is formed in the peripheral wall of the second cylinder block 13. The suction port 13s is connected to an external refrigerant circuit. The refrigerant gas sucked into the swash plate chamber 24 from the external refrigerant circuit through the suction port 13s is sucked into the suction chambers 14a and 15a through the suction passages 12c and 13c. Therefore, the suction chambers 14a and 15a and the swash plate chamber 24 are in the suction pressure region, and the pressures are almost equal.

  An annular flange portion 21f disposed in the first large-diameter hole 12b protrudes from the rotary shaft 21. A first thrust bearing 27 a is disposed between the flange portion 21 f and the first cylinder block 12 in the axial direction of the rotary shaft 21. A cylindrical support member 39 is press-fitted on the rear end side of the rotary shaft 21. From the outer peripheral surface of the support member 39, an annular flange portion 39f disposed in the second large-diameter hole 13b is projected. A second thrust bearing 27 b is disposed between the flange portion 39 f and the second cylinder block 13 in the axial direction of the rotary shaft 21.

  The swash plate chamber 24 includes an actuator 30 that can change the inclination angle of the swash plate 23 with respect to the direction perpendicular to the rotation axis L of the rotation shaft 21 in the swash plate 23. The actuator 30 is provided on the rear side of the flange portion 21 f of the rotation shaft 21 and on the front side of the swash plate 23, and has an annular partition body 31 that can rotate integrally with the rotation shaft 21. The actuator 30 includes a bottomed cylindrical moving body 32 that is arranged between the flange portion 21 f and the partition body 31 and is movable in the axial direction of the rotary shaft 21 in the swash plate chamber 24.

  The moving body 32 is formed of an annular bottom portion 32a having an insertion hole 32e through which the rotation shaft 21 is inserted, and a cylindrical portion 32b extending along the axial direction of the rotation shaft 21 from the outer peripheral edge of the bottom portion 32a. . The inner peripheral surface of the cylindrical portion 32 b is slidable with respect to the outer peripheral edge of the partition body 31. Thereby, the moving body 32 can rotate integrally with the rotating shaft 21 via the partition body 31. The space between the inner peripheral surface of the cylindrical portion 32 b and the outer peripheral edge of the partition body 31 is sealed by a seal member 33, and the space between the through hole 32 e and the rotary shaft 21 is sealed by a seal member 34. The actuator 30 has a control pressure chamber 35 partitioned by the partition body 31 and the moving body 32.

  A first in-shaft passage 21 a extending along the axial direction of the rotation shaft 21 is formed in the rotation shaft 21. The rear end of the first in-axis passage 21a opens to the pressure adjustment chamber 15c. Further, the rotation shaft 21 is formed with a second in-axis passage 21 b extending along the radial direction of the rotation shaft 21. One end of the second in-shaft passage 21 b communicates with the tip of the first in-shaft passage 21 a, and the other end opens to the control pressure chamber 35. Therefore, the control pressure chamber 35 and the pressure adjustment chamber 15c communicate with each other via the first in-axis passage 21a and the second in-axis passage 21b.

  As shown in FIG. 2, the pressure adjustment chamber 15 c and the suction chamber 15 a communicate with each other via the extraction passage 36. The extraction passage 36 is provided with an orifice 36a, and the flow rate of the refrigerant gas flowing through the extraction passage 36 is restricted by the orifice 36a. Further, the pressure adjustment chamber 15 c and the discharge chamber 15 b communicate with each other via an air supply passage 37. On the air supply passage 37, an electromagnetic control valve 37s is provided as a control mechanism for controlling the actuator 30. The control valve 37s can adjust the opening degree of the air supply passage 37 based on the pressure of the suction chamber 15a. The flow rate of the refrigerant gas flowing through the air supply passage 37 is adjusted by the control valve 37s.

  The refrigerant gas is introduced into the control pressure chamber 35 from the discharge chamber 15b through the air supply passage 37, the pressure adjustment chamber 15c, the first in-shaft passage 21a, and the second in-shaft passage 21b. By discharging into the suction chamber 15a via the in-shaft passage 21b, the first in-shaft passage 21a, the pressure adjusting chamber 15c, and the bleed passage 36, the pressure inside the control pressure chamber 35 is changed. The moving body 32 moves in the axial direction of the rotary shaft 21 with respect to the partition body 31 in accordance with the pressure difference between the control pressure chamber 35 and the swash plate chamber 24. Therefore, the refrigerant gas introduced into the control pressure chamber 35 is a control gas used for performing movement control of the moving body 32.

  As shown in FIG. 1, in the swash plate chamber 24, a lug arm 40, which is a link mechanism that allows a change in the inclination angle of the swash plate 23, is disposed between the swash plate 23 and the flange portion 39f. The lug arm 40 is formed in a substantially L shape from one end to the other end. A weight portion 40 w is formed at one end of the lug arm 40. The weight part 40 w passes through the groove part 23 b of the swash plate 23 and is positioned on the front side of the swash plate 23.

  One end side of the lug arm 40 is connected to the upper end side (the upper side in FIG. 1) of the swash plate 23 by a cylindrical first pin 41 that traverses the inside of the groove 23b. Thus, one end side of the lug arm 40 is supported so as to be swingable around the first swing center M1 with respect to the swash plate 23 with the axis of the first pin 41 as the first swing center M1. The other end of the lug arm 40 is connected to the support member 39 by a cylindrical second pin 42. Thereby, the other end side of the lug arm 40 is supported so as to be swingable around the second swing center M2 with respect to the support member 39 with the axis of the second pin 42 as the second swing center M2.

  A pair of moving body arms 32c (only one moving body arm 32c is shown in FIG. 1) are provided at the tip of the cylindrical portion 32b of the moving body 32 so as to protrude toward the swash plate 23 side. Each moving body arm 32c is formed with an insertion hole 32h having a long hole shape. Each insertion hole 32h extends in a direction orthogonal to the protruding direction from the tip of the cylindrical portion 32b of the moving body 32 in each moving body arm 32c. In addition, a moving body is provided on a lower surface (lower side in FIG. 1) that is the outer peripheral portion of the swash plate 23 and on a facing surface 23e (a surface on the moving body 32 side of the swash plate 23) facing the moving body 32. A swash plate arm 23c that protrudes toward the side 32 and is inserted between the pair of moving body arms 32c is provided.

  The swash plate arm 23c supports two connecting pins 43 (only one connecting pin 43 is shown in FIG. 1) as connecting members respectively inserted into the insertion holes 32h of the moving body arms 32c. Each connecting pin 43 is cylindrical. The moving body 32 and the swash plate 23 are connected via two connecting pins 43. Each connecting pin 43 is slidably held in each insertion hole 32h. The swash plate arm 23 c, the moving body arm 32 c, and the connecting pin 43 constitute a connecting mechanism that connects the swash plate 23 and the moving body 32.

  As shown in FIG. 3, each insertion hole 32 h guides each connection pin 43, and the guide in which the inclination angle of the swash plate 23 changes as the moving body 32 moves in the direction in which the rotation axis L of the rotation shaft 21 extends. It has a surface 32g. Each guide surface 32g is located on the swash plate 23 side in the insertion hole 32h. The pair of guide surfaces 32 g is set across the rotation axis L of the rotation shaft 21. The pair of guide surfaces 32g rotate when the swash plate 23 is not rotating around the line L1 connecting the top dead center corresponding portion 231 and the bottom dead center corresponding portion 232 of the double-headed piston 25 in the swash plate 23. Each moving body arm 32c is formed so as to have the same position in the direction in which the rotation axis L of the shaft 21 extends (the moving direction of the moving body 32).

  Each connecting pin 43 is placed on the swash plate arm 23c so that the position of the contact portion that can contact each guide surface 32g in each connecting pin 43 is shifted from each other in the direction in which the rotation axis L of the rotating shaft 21 extends. It is supported. That is, each connecting pin 43 extends so that the central axis L10 of each connecting pin 43 extends parallel to the opposing surface 23e at a position shifted from each other in the direction in which the rotating axis L of the rotating shaft 21 extends. It is supported by.

  In the variable displacement swash plate compressor 10 configured as described above, when the valve opening degree of the control valve 37s is decreased, the supply passage 37, the pressure adjustment chamber 15c, the first in-shaft passage 21a, and the second shaft from the discharge chamber 15b. The flow rate of the refrigerant gas introduced into the control pressure chamber 35 via the inner passage 21b is reduced. The refrigerant gas is discharged from the control pressure chamber 35 to the suction chamber 15a through the second in-shaft passage 21b, the first in-shaft passage 21a, the pressure adjustment chamber 15c, and the extraction passage 36, whereby the control pressure chamber 35 is discharged. Is substantially equal to the pressure in the suction chamber 15a. Therefore, the pressure difference between the control pressure chamber 35 and the swash plate chamber 24 is reduced, so that the swash plate 23 moves the moving body 32 through the connecting pins 43 by the compression force from the double-headed piston 25 acting on the swash plate 23. The mobile body 32 is moved so that the bottom 32 a of the mobile body 32 approaches the partition body 31.

  As shown in FIG. 4, when the moving body 32 moves so that the bottom 32a of the moving body 32 approaches the partition body 31, each connecting pin 43 slides inside each insertion hole 32h, and the swash plate 23 moves. It swings around the first swing center M1. As the swash plate 23 swings around the first swing center M1, the lug arm 40 swings around the second swing center M2, and the lug arm 40 approaches the flange portion 39f. Thereby, the inclination angle of the swash plate 23 is reduced, the stroke of the double-headed piston 25 is reduced, and the discharge capacity is reduced.

  When the valve opening degree of the control valve 37s is increased, it is introduced from the discharge chamber 15b into the control pressure chamber 35 through the air supply passage 37, the pressure adjustment chamber 15c, the first in-shaft passage 21a, and the second in-shaft passage 21b. The flow rate of refrigerant gas increases. For this reason, the pressure in the control pressure chamber 35 becomes substantially equal to the pressure in the discharge chamber 15b. Therefore, as the pressure difference between the control pressure chamber 35 and the swash plate chamber 24 increases, the moving body 32 pulls the swash plate 23 via the connecting pins 43, and the bottom 32 a of the moving body 32 is separated from the partition body 31. Move away.

  As shown in FIG. 1, when the moving body 32 moves so that the bottom 32a of the moving body 32 is separated from the partition body 31, each connecting pin 43 slides inside each insertion hole 32h, and the swash plate 23 is moved. Swings around the first swing center M1 in the direction opposite to the swing direction when the tilt angle of the swash plate 23 is decreased. As the swash plate 23 swings in the direction opposite to the swing direction when the tilt angle of the swash plate 23 decreases, the lug arm 40 moves around the second swing center M2 around the first swing center M1. 23 swings in the direction opposite to the swinging direction when the tilt angle is decreased, and the lug arm 40 is separated from the flange portion 39f. Thereby, the inclination angle of the swash plate 23 is increased, the stroke of the double-headed piston 25 is increased, and the discharge capacity is increased.

Next, the operation of the first embodiment will be described.
As shown in FIG. 5, in the variable displacement swash plate compressor 10, a compression force P <b> 1 acts on the swash plate 23 from the double-headed piston 25. By this compressive force P1, the swash plate 23 changes the inclination angle of the swash plate 23 around the line L1 connecting the top dead center corresponding portion 231 and the bottom dead center corresponding portion 232 of the double-headed piston 25 in the swash plate 23. May rotate in a different direction (direction of arrow R1 shown in FIG. 5).

  At this time, when the swash plate 23 is not rotating, the positions of the contact portions that can come into contact with the guide surface 32g in each connection pin 43 are shifted from each other in the direction in which the rotation axis L of the rotation shaft 21 extends. Until the connecting pin 43 comes into contact with the pair of guide surfaces 32g, the swash plate 23 is allowed to rotate in a direction different from the change of the inclination angle of the swash plate 23. Therefore, even if the compression force P1 acts on the swash plate 23 from the double-headed piston 25 and the swash plate 23 rotates in a direction different from the change in the inclination angle of the swash plate 23 by this compression force P1, it moves. It is suppressed that the body 32 rotates in the direction different from the change of the inclination angle of the swash plate 23 via each connecting pin 43. When the swash plate 23 rotates, the inclination angle of the swash plate 23 is changed by the contact between the connecting pins 43 and the pair of guide surfaces 32g.

In the first embodiment, the following effects can be obtained.
(1) When the swash plate 23 is not rotating, the positions of the contact portions that can come into contact with the guide surface 32g in each connecting pin 43 are shifted from each other in the direction in which the rotation axis L of the rotation shaft 21 extends. Until the connecting pin 43 comes into contact with the pair of guide surfaces 32g, the swash plate 23 is allowed to rotate in a direction different from the change of the inclination angle of the swash plate 23. Therefore, even if the compression force P1 acts on the swash plate 23 from the double-headed piston 25 and the swash plate 23 rotates in a direction different from the change in the inclination angle of the swash plate 23 by this compression force P1, it moves. It is possible to suppress the body 32 from rotating in a direction different from the change in the inclination angle of the swash plate 23 via each connecting pin 43. As a result, the inclination angle of the swash plate 23 can be changed smoothly.

  (2) According to the present embodiment, the moving body 32 is different from the change in the inclination angle of the swash plate 23 via each connection pin 43 only by adjusting the arrangement position of each connection pin 43 with respect to the swash plate arm 23 c. It can suppress turning in the direction.

  (3) In a double-headed piston type swash plate compressor that employs the double-headed piston 25, the swash plate chamber 24 is controlled to change the tilt angle of the swash plate 23 as in a variable displacement swash plate type compressor having a single-headed piston. It cannot function as a room. Therefore, in the present embodiment, the inclination angle of the swash plate 23 is changed by changing the pressure of the control pressure chamber 35 partitioned by the moving body 32. Since the control pressure chamber 35 is a smaller space than the swash plate chamber 24, the amount of refrigerant gas introduced into the control pressure chamber 35 is small, and the responsiveness of changing the tilt angle of the swash plate 23 is good. And according to this embodiment, since the inclination angle of the swash plate 23 can be changed smoothly, it is possible to prevent the amount of refrigerant gas introduced into the control pressure chamber 35 from becoming unnecessarily large. be able to.

(Second Embodiment)
A second embodiment that embodies a variable displacement swash plate compressor will be described below with reference to FIGS. In the embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the redundant description thereof is omitted or simplified.

  As shown in FIG. 6, the swash plate arm 23c is provided with a connecting pin 43A as a connecting member that is inserted into the insertion hole 32h of each moving body arm 32c. One end of the connecting pin 43A is inserted into the insertion hole 32h of one moving body arm 32c, and the other end of the connecting pin 43A is inserted into the insertion hole 32h of the other moving body arm 32c. . The connecting pin 43A is provided on the swash plate arm 23c so that the central axis L10 of the connecting pin 43A extends in parallel to the facing surface 23e of the swash plate 23. Therefore, the connecting pin 43A is supported by the swash plate arm 23c so that the position of the contact portion that can come into contact with each guide surface 32g is the same position in the direction in which the rotation axis L of the rotation shaft 21 extends.

  Each insertion hole 32h extends in a direction orthogonal to the protruding direction from the tip of the cylindrical portion 32b of the moving body 32 in each moving body arm 32c. Each guide surface 32g is formed on each movable body arm 32c so as to be shifted from each other in the direction in which the rotation axis L of the rotation shaft 21 extends when the swash plate 23 is not rotating.

Next, the operation of the second embodiment will be described.
As shown in FIG. 7, when the swash plate 23 is not rotating, the pair of guide surfaces 32g are displaced from each other in the direction in which the rotation axis L of the rotation shaft 21 extends. Until the contact with 32g, rotation in a direction different from the change of the inclination angle of the swash plate 23 in the swash plate 23 is allowed. Therefore, even if the compression force P1 acts on the swash plate 23 from the double-headed piston 25 and the swash plate 23 rotates in a direction different from the change in the inclination angle of the swash plate 23 by this compression force P1, it moves. It is suppressed that the body 32 rotates in a direction different from the change of the inclination angle of the swash plate 23 via the connecting pin 43A.

Therefore, according to the second embodiment, in addition to the effects (1) and (3) of the first embodiment, the following effects can be obtained.
(4) According to the present embodiment, the moving body 32 is different from the change in the inclination angle of the swash plate 23 via the connecting pin 43A only by adjusting the formation position of the pair of guide surfaces 32g with respect to the moving body arm 32c. It can suppress turning in the direction.

(Third embodiment)
A third embodiment that embodies a variable displacement swash plate compressor will be described below with reference to FIGS.

  As shown in FIG. 8, the swash plate arm 23c is provided with a connecting pin 43A as a connecting member that is inserted into the insertion hole 32h of each moving body arm 32c. One end of the connecting pin 43A is inserted into the insertion hole 32h of one moving body arm 32c, and the other end of the connecting pin 43A is inserted into the insertion hole 32h of the other moving body arm 32c. . The connecting pin 43A is provided on the swash plate arm 23c so that the central axis L10 of the connecting pin 43A extends in parallel to the facing surface 23e of the swash plate 23. Therefore, the connecting pin 43A is supported by the swash plate arm 23c so that the position of the contact portion that can come into contact with each guide surface 32g is the same position in the direction in which the rotation axis L of the rotation shaft 21 extends.

  Each insertion hole 32h extends in a direction intersecting with each moving body arm 32c but not perpendicular to the protruding direction from the tip of the cylindrical portion 32b of the moving body 32. Therefore, each guide surface 32g is formed on each movable body arm 32c so as to be shifted from each other in the direction in which the rotation axis L of the rotation shaft 21 extends when the swash plate 23 is not rotating. Each guide surface 32g extends in an intersecting direction, not orthogonal to the protruding direction from the tip of the cylindrical portion 32b of the moving body 32 in each moving body arm 32c, and is formed on the same straight line.

Next, the operation of the third embodiment will be described.
As shown in FIG. 9, when the swash plate 23 is not rotating, the pair of guide surfaces 32g are displaced from each other in the direction in which the rotation axis L of the rotation shaft 21 extends. Until the contact with 32g, rotation in a direction different from the change of the inclination angle of the swash plate 23 in the swash plate 23 is allowed. Therefore, even if the compression force P1 acts on the swash plate 23 from the double-headed piston 25 and the swash plate 23 rotates in a direction different from the change in the inclination angle of the swash plate 23 by this compression force P1, it moves. It is suppressed that the body 32 rotates in a direction different from the change of the inclination angle of the swash plate 23 via the connecting pin 43A.

Therefore, according to the third embodiment, the same effects as the effects (1) and (3) of the first embodiment and the effect (4) of the second embodiment can be obtained.
(Fourth embodiment)
A third embodiment that embodies a variable displacement swash plate compressor will be described below with reference to FIGS.

  As shown in FIG. 10, the swash plate arm 23c is provided with a connecting pin 43A as a connecting member that is inserted into the insertion hole 32h of each moving body arm 32c. One end of the connecting pin 43A is inserted into the insertion hole 32h of one moving body arm 32c, and the other end of the connecting pin 43A is inserted into the insertion hole 32h of the other moving body arm 32c. . The connecting pin 43A is supported by the swash plate arm 23c in a state where the central axis L10 of the connecting pin 43A is inclined with respect to the facing surface 23e of the swash plate 23.

  Each insertion hole 32h extends in a direction orthogonal to the protruding direction from the tip of the cylindrical portion 32b of the moving body 32 in each moving body arm 32c. Therefore, each guide surface 32g is formed on each movable body arm 32c so as to be at the same position in the direction in which the rotation axis L of the rotation shaft 21 extends when the swash plate 23 is not rotating.

Next, the operation of the fourth embodiment will be described.
As shown in FIG. 11, when the swash plate 23 is not rotating, the connecting pin 43A is inclined with respect to the opposing surface 23e of the swash plate 23, so that the connecting pin 43A and the pair of guide surfaces 32g are in contact with each other. Until the contact, rotation in a direction different from the change of the inclination angle of the swash plate 23 in the swash plate 23 is allowed. Therefore, even if the compression force P1 acts on the swash plate 23 from the double-headed piston 25 and the swash plate 23 rotates in a direction different from the change in the inclination angle of the swash plate 23 by this compression force P1, it moves. It is suppressed that the body 32 rotates in a direction different from the change of the inclination angle of the swash plate 23 via the connecting pin 43A.

Therefore, according to the fourth embodiment, in addition to the effects (1) and (3) of the first embodiment, the following effects can be obtained.
(5) According to the present embodiment, the moving body 32 is different from the change in the inclination angle of the swash plate 23 via the connection pin 43A only by adjusting the inclination of the connection pin 43A with respect to the facing surface 23e of the swash plate 23. It can suppress turning in the direction.

In addition, you may change each said embodiment as follows.
In the second and third embodiments, by adjusting the size and shape of each insertion hole 32h, each guide surface 32g is shifted from each other in the direction in which the rotation axis L of the rotation shaft 21 extends. May be.

  In the second, third, and fourth embodiments, the swash plate arm 23c may be provided with two connection pins 43 as connection members that are inserted through the insertion holes 32h of the movable body arms 32c. .

  In each of the above embodiments, the opposing surface 23e of the swash plate 23 is provided with a pair of swash plate arms protruding toward the moving body 32 side, and at the tip of the cylindrical portion 32b of the moving body 32, the swash plate 23 side There may be provided a movable arm that protrudes toward the side and is inserted between the pair of swash plate arms.

  In each of the above embodiments, the connecting pins 43 and 43A may be supported by the moving body arm 32c, and a guide surface for guiding the connecting pins 43 and 43A may be formed on the swash plate arm 23c.

In each of the above embodiments, the connecting pins 43 and 43A may be fixed to the lower end side of the swash plate 23 by screwing.
In each of the above embodiments, the connecting pins 43 and 43A do not have to be fixed to the lower end side of the swash plate 23. For example, the connecting pins 43 and 43A are inserted into insertion holes formed on the lower end side of the swash plate 23. It may be held so as to be slidable.

  In each of the above embodiments, an orifice is provided in the air supply passage 37 that connects the pressure adjustment chamber 15c and the discharge chamber 15b, and an electromagnetic type is provided on the extraction passage 36 that connects the pressure adjustment chamber 15c and the suction chamber 15a. The control valve 37s may be provided.

  In each of the above embodiments, the variable displacement swash plate compressor 10 is a double-headed piston swash plate compressor that employs a double-headed piston 25, but is a single-headed piston swash plate compressor that employs a single-headed piston. Also good.

In each of the above embodiments, a driving force may be obtained from an external driving source via a clutch.
Next, the technical idea that can be grasped from the above embodiments and other examples will be described below.

  (A) The piston is a double-headed piston.

  DESCRIPTION OF SYMBOLS 10 ... Variable displacement type swash plate type compressor, 11 ... Housing, 12a ... 1st cylinder bore as a cylinder bore, 13a ... 2nd cylinder bore as a cylinder bore, 14a, 15a ... Suction chamber, 14b, 15b ... Discharge chamber, 21 ... Rotating shaft , 23 ... swash plate, 23c ... swash plate arm constituting the coupling mechanism, 24 ... swash plate chamber, 25 ... double-headed piston as a piston, 26 ... shoe as a conversion mechanism, 30 ... actuator, 31 ... partition body, 32 ... movement Body, 32c ... moving body arm constituting the coupling mechanism, 32g ... guide surface, 35 ... control pressure chamber, 37s ... control valve as control mechanism, 40 ... lug arm as link mechanism, 43, 43A ... constituting coupling mechanism Connecting pins as connecting members, 231... Top dead center corresponding portion, 232.

Claims (4)

A suction chamber, a discharge chamber, a swash plate chamber communicating with the suction chamber, a housing having a cylinder bore, a rotation shaft rotatably supported by the housing, and a rotation shaft that is rotatable in the swash plate chamber A swash plate, a link mechanism that is provided between the rotary shaft and the swash plate and allows the inclination angle of the swash plate to be changed with respect to a direction orthogonal to the rotary axis of the rotary shaft, and reciprocally movable to the cylinder bore A housed piston, a conversion mechanism for reciprocating the piston in the cylinder bore with a stroke corresponding to the tilt angle by rotation of the swash plate, an actuator disposed in the swash plate chamber and capable of changing the tilt angle; A control mechanism for controlling the actuator,
The actuator includes a partition provided on the rotation shaft, a movable body connected to the swash plate via a connecting mechanism, and movable in a direction in which the rotation axis of the rotation shaft extends in the swash plate chamber, and the partition A variable capacity swash plate compressor having a control pressure chamber that is partitioned by a body and the moving body and moves the moving body by introducing a refrigerant from the discharge chamber,
The coupling mechanism includes a swash plate arm formed on the swash plate, a movable body arm formed on the movable body, and a coupling member provided between the swash plate arm and the movable body arm,
The connecting member is guided to either the swash plate arm or the movable body arm, and the tilt angle is changed as the rotational axis of the movable body moves in a direction in which the rotational axis extends. A pair of guide surfaces set across the rotation axis of the other, the other supports the connecting member,
When the swash plate rotates about a line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate, the connecting member and the pair of guide surfaces come into contact with each other. The variable capacity swash plate compressor is characterized in that the inclination angle of the swash plate is changed. Two connecting members are provided between the swash plate arm and the movable body arm,
When the swash plate does not rotate about the line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate, the pair of guide surfaces rotate the rotation shaft. The position of the contact portion that is formed on either the swash plate arm or the movable body arm so as to be in the same position in the direction in which the axis extends and that can contact the guide surface in each connecting member is the rotation 2. The connection member according to claim 1, wherein each of the connecting members is supported by either the swash plate arm or the movable body arm so as to be shifted from each other in a direction in which the rotation axis of the shaft extends. Variable capacity swash plate compressor.   When the swash plate is not rotating around the line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate, the contact that can come into contact with the guide surface in the connecting member Each connecting member is supported by either the swash plate arm or the movable body arm so that the position of the part is the same position in the direction in which the rotation axis of the rotation shaft extends, and the pair of guide surfaces Is formed on either one of the swash plate arm or the movable body arm so as to be shifted from each other in the direction in which the rotation axis of the rotation shaft extends. Variable capacity swash plate compressor.   When the swash plate does not rotate around the line connecting the top dead center corresponding portion and the bottom dead center corresponding portion of the piston in the swash plate, the pair of guide surfaces rotate the rotation shaft. It is formed on either the swash plate arm or the movable body arm so as to be at the same position in the direction in which the axis extends, and the connecting member is inclined with respect to the movable body side surface of the swash plate 2. The variable capacity swash plate compressor according to claim 1, wherein the variable capacity swash plate compressor is supported by the other of the swash plate arm and the movable body arm.