JP2016121667A - Variable-displacement swash plate compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly change a tilt angle of a swash plate.SOLUTION: A rotary-shaft recessed part 21a is formed in a rotary shaft 21. When a tilt angle of a swash plate 23 is a minimum tilt angle, one end portion of a rotary-shaft facing part 32s in a direction along a rotation axis of the rotary shaft 21 faces the rotary-shaft recessed part 21a. Even if moment for tilting a moving body 32 with respect to the rotation axis of the rotary shaft 21 acts on the moving body 32 when the tilt angle of the swash plate 23 is the minimum tilt angle, it is possible to easily avoid contact between the rotary-shaft facing part 32s and the rotary shaft 21 at two points on both sides on which the rotary shaft 21 is sandwiched between contact points between the rotary-shaft facing part 32s and the rotary shaft 21. Furthermore, when the tilt angle of the swash plate 23 is a maximum tilt angle, the rotary-shaft facing part 32s does not face the rotary-shaft recessed part 21a; therefore, a contact area between the rotary-shaft facing part 32s and the rotary shaft 21 is larger than a contact area when the tilt angle of the swash plate 23 is the minimum tilt angle. Therefore, friction between the rotary-shaft facing part 32s and the rotary shaft 21 is suppressed when the tilt angle of the swash plate 23 is the maximum tilt angle.SELECTED DRAWING: Figure 2

Description

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

  Conventionally, for example, Patent Document 1 discloses a variable displacement swash plate compressor including an actuator capable of changing the tilt angle of a swash plate. The actuator includes a partition body provided on the rotation shaft and a moving body coupled to the swash plate. And the control pressure chamber to which the refrigerant from the discharge chamber is supplied is partitioned by the partition body and the moving body. The moving body is movable in the direction along the rotation axis of the rotation shaft by changing the pressure of the control pressure chamber as the refrigerant is supplied to the control pressure chamber. And the inclination angle of a swash plate is changed with the movement to the direction along the rotating shaft line of the rotating shaft in a moving body.

JP-A-53-69911

  By the way, the moving body has a rotating shaft facing portion or a partitioning body facing portion that slides on the rotating shaft or on the partition as the moving body moves in the direction along the rotation axis of the rotating shaft. As the moving body moves in the direction along the rotation axis of the rotating shaft, the rotating shaft facing portion or the partitioning body facing portion slides on the rotating shaft or on the partitioning body, so that the moving body becomes the rotating shaft. Move in a direction along the axis of rotation.

  When the inclination angle of the swash plate is the maximum inclination angle, since the compression reaction force of the piston is large, the piston is transmitted from the piston to the rotating shaft or the partition body through the swash plate and the rotating shaft facing portion or the partition body facing portion of the moving body. The compression reaction force from is large. Therefore, the force transmitted from the rotating shaft facing portion or the partitioning body facing portion to the rotating shaft or the partitioning body is larger when the swash plate has the maximum tilt angle than when the swash plate has the minimum tilt angle.

  Here, the larger the contact area of the rotating shaft facing portion or the partitioning body facing portion with the rotating shaft or the partitioning body, the harder the wear between the rotating shaft facing portion or the partitioning body facing portion and the rotating shaft or the partitioning body occurs. Become. That is, the smaller the contact area between the rotating shaft facing portion or the partitioning body facing portion and the rotating shaft or the partitioning body, the easier it is for the rotating shaft facing portion or the partitioning body facing portion and the rotating shaft or the partitioning body to slide locally. Therefore, wear between the rotating shaft facing portion or the partitioning body facing portion and the rotating shaft or the partitioning body is likely to occur. Therefore, when the tilting angle of the swash plate is the maximum inclination angle and the contact area between the rotating shaft facing portion or the partitioning body facing portion and the rotating shaft or the partitioning body is small, the rotating shaft facing portion or the partitioning body facing portion and the rotating shaft or the partitioning Wear between the body and the body tends to occur, and the inclination angle of the swash plate cannot be reduced smoothly from the maximum inclination angle, and the inclination angle of the swash plate cannot be changed smoothly.

  In addition, when the moving body moves in a direction along the rotation axis of the rotating shaft, a moment that tilts the moving body with respect to the rotating axis of the rotating shaft may act on the moving body. When the moving body is inclined with respect to the rotation axis of the rotation shaft, the rotation shaft facing portion or the partition body facing portion and the rotation shaft or the partition between the rotation shaft facing portion or the partition body facing portion and the rotation shaft or the partition body. When the contact point with the body is in contact with the two points on both sides of the rotating shaft, a force generated to support the tilt of the moving body is generated at each contact point, and the friction force generated by the force causes the moving body to A twist occurs between the rotating shaft and the partition. This twisting is more likely to occur as the length in the direction along the rotation axis of the contact area with the rotation shaft or the partition body at the rotation shaft facing portion or the partition body facing portion increases. When the swash plate has a minimum inclination angle, if the length in the direction along the rotation axis of the rotation shaft or the contact area with the partition body in the rotation shaft facing portion or the partition body facing portion is long, a twist occurs. Thus, the sliding resistance increases due to this twisting, and the moving body becomes difficult to move smoothly along the rotation axis of the rotation shaft. As a result, the inclination angle of the swash plate cannot be increased smoothly from the minimum inclination angle, and 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 housing in which a discharge chamber, a swash plate chamber and a cylinder bore are formed, a rotating shaft rotatably supported by the housing, and rotation of the rotating shaft. A swash plate that can rotate indoors, and a link mechanism that is provided between the rotation shaft and the swash plate and allows a change in the inclination angle of the swash plate with respect to a first direction orthogonal to the rotation axis of the rotation shaft. A piston housed reciprocally in the cylinder bore, 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, and disposed in the swash plate chamber, An actuator capable of changing the tilt angle; and a control mechanism for controlling the actuator, the actuator comprising: a partition provided on the rotating shaft; and the swash plate chamber It is movable in a direction along the rotation axis, and is partitioned by a moving body having a rotating shaft facing portion that slides with the rotating shaft, the partition body and the moving body, and introduces a refrigerant from the discharge chamber A variable capacity swash plate compressor having a control pressure chamber for moving the moving body, wherein the rotary shaft is located at the rotary shaft facing portion when the tilt angle of the swash plate is a minimum tilt angle. The rotation axis of the contact area of the rotation axis facing portion with the rotation axis when the inclination angle of the swash plate has a minimum inclination angle, and has a rotation axis recess facing one end in a direction along the rotation axis The length in the direction along the rotation axis is shorter than the length in the direction along the rotation axis of the contact area of the rotation shaft facing portion with the rotation shaft when the inclination angle of the swash plate is the maximum inclination angle. did.

  According to this, when the inclination angle of the swash plate is the maximum inclination angle, the rotating shaft facing portion does not face the rotating shaft concave portion, so the contact area of the rotating shaft facing portion with the rotating shaft is the minimum inclination angle of the swash plate. Bigger than that. For this reason, it is possible to suppress wear between the rotary shaft facing portion and the rotary shaft when the tilt angle of the swash plate is the maximum tilt angle, and to smoothly reduce the tilt angle of the swash plate from the maximum tilt angle. In addition, when the swash plate has a minimum inclination angle, one end portion in the direction along the rotation axis at the rotation axis facing portion faces the rotation axis recess, so that the moving body is inclined with respect to the rotation axis of the rotation axis. Even when the moment acts on the moving body, the rotating shaft facing portion and the rotating shaft are prevented from coming into contact at the two points on both sides of the rotating shaft between the rotating shaft facing portion and the rotating shaft. Can be made easier. As a result, when the tilt angle of the swash plate is increased from the minimum tilt angle, it is possible to suppress the occurrence of a twist between the moving body and the rotating shaft, and the tilt angle of the swash plate can be smoothly increased from the minimum tilt angle. Can be increased. From the above, the inclination angle of the swash plate can be changed smoothly.

  In the variable capacity swash plate compressor, an inner shaft passage for supplying the refrigerant from the discharge chamber to the control pressure chamber is formed on the rotary shaft, and the inner shaft passage on the control pressure chamber side is formed. It is preferable that the end portion is opened in the rotary shaft recess.

  According to this, as compared with the case where the end portion on the control pressure chamber side in the in-shaft passage is disposed at a position shifted with respect to the recessed portion of the rotating shaft in the axial direction of the rotating shaft, the variable capacity swash plate compressor The physique along the rotation axis of the rotating shaft in can be reduced in size.

  A variable capacity swash plate compressor that solves the above problems includes a housing in which a discharge chamber, a swash plate chamber and a cylinder bore are formed, a rotating shaft rotatably supported by the housing, and rotation of the rotating shaft. A swash plate that can rotate indoors, and a link mechanism that is provided between the rotation shaft and the swash plate and allows a change in the inclination angle of the swash plate with respect to a first direction orthogonal to the rotation axis of the rotation shaft. A piston housed reciprocally in the cylinder bore, 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, and disposed in the swash plate chamber, An actuator capable of changing the tilt angle; and a control mechanism for controlling the actuator, the actuator comprising: a partition provided on the rotating shaft; and the swash plate chamber The refrigerant is movable in a direction along the rotation axis and is partitioned by a movable body having a partition body facing portion that slides on the partition body, the partition body and the movable body, and introduces a refrigerant from the discharge chamber. A variable capacity swash plate compressor having a control pressure chamber for moving the moving body by moving the movable body when the tilt angle of the swash plate is a minimum tilt angle. A movable body concave portion facing one end in a direction along the axis, and along the rotation axis of the contact area of the partition body facing portion with the partition body when the tilt angle of the swash plate is a minimum tilt angle The length in the vertical direction is made shorter than the length in the direction along the rotational axis of the contact area of the partition body facing portion with the partition body when the tilt angle of the swash plate is the maximum tilt angle.

  According to this, when the inclination angle of the swash plate is the maximum inclination angle, since the partition body does not face the moving body recess, the contact area of the partition body facing portion with the partition body is the minimum inclination angle of the swash plate. Bigger than that. For this reason, when the inclination angle of the swash plate is the maximum inclination angle, it is possible to suppress wear between the compartment facing portion and the compartment body, and the inclination angle of the swash plate can be smoothly reduced from the maximum inclination angle. In addition, when the inclination angle of the swash plate is the minimum inclination angle, one end of the partition body in the direction along the rotational axis faces the concave portion of the moving body, so that a moment for tilting the moving body with respect to the rotational axis of the rotational axis is generated. Even if it acts on the moving body, it is easy to avoid that the partition body facing portion and the partition body come into contact at the two points on both sides of the rotating shaft between the contact points of the partition body facing portion and the partition body. be able to. As a result, when the inclination angle of the swash plate is increased from the minimum inclination angle, it is possible to suppress the occurrence of a twist between the moving body and the partition body, and the inclination angle of the swash plate can be smoothly changed from the minimum inclination angle. Can be increased. From the above, the inclination angle of the swash plate can be changed smoothly.

  In the variable capacity swash plate type compressor, the swash plate has an insertion hole through which the rotating shaft is inserted, and the moving body and the swash plate are between the moving body and the swash plate. The swash plate is connected via a connecting member provided on the outer peripheral side of the insertion hole, and the swash plate guides the connecting member and moves the slant as the moving body moves in the direction along the rotation axis. A guide surface that changes a tilt angle of the plate, and when the tilt angle of the swash plate is a maximum tilt angle, a perpendicular or normal line of the guide surface and the rotation axis are orthogonal to a direction in which the rotation axis extends. The guide surface is set so as to intersect within a region surrounded by a contact portion with respect to the rotation shaft in the rotation shaft facing portion when viewed from a direction that is perpendicular to the first direction. It is preferred that

  According to this, with the change of the inclination angle of the swash plate, a force acting on the swash plate from the connecting member on the guide surface acts on the normal line or the normal line of the guide surface. Then, in the direction in which the perpendicular line or the normal line extends, the reaction force of the force that acts on the swash plate from the coupling member on the guide surface acts on the moving body from the coupling member. Here, along with the change of the inclination angle of the swash plate, the intersection of the normal or normal line of the guide surface (force acting on the moving body from the connecting member) and the rotation axis of the rotation axis rotates in the axial direction of the rotation axis. It arrange | positions in the area | region enclosed by the contact part with respect to the rotating shaft in an axis | shaft opposing part. At this time, the resultant force of the force that acts on the moving body from the connecting member and the force that moves the moving body in the axial direction of the rotating shaft due to the pressure in the control pressure chamber is generated on the vertical line including the intersection, and balances this resultant force. A reverse force is also generated on this vertical line. As a result, since all the forces applied to the moving body are generated and balanced on the vertical line including the intersection, the moving body does not generate a moment that tilts the moving body with respect to the rotation axis of the rotating shaft. Therefore, when the inclination angle of the swash plate is decreased from the maximum inclination angle, it is possible to suppress the occurrence of a twist between the moving body and the rotating shaft, and the inclination angle of the swash plate can be reduced from the maximum inclination angle. It can be done smoothly.

  In the variable capacity swash plate type compressor, the swash plate has an insertion hole through which the rotating shaft is inserted, and the moving body and the swash plate are between the moving body and the swash plate. The movable body is coupled via a coupling member provided on the outer peripheral side with respect to the insertion hole, and the movable body guides the coupling member and is inclined with the movement of the movable body in the direction along the rotation axis. A guide surface that changes a tilt angle of the plate, and when the tilt angle of the swash plate is a maximum tilt angle, a perpendicular or normal line of the guide surface and the rotation axis are orthogonal to a direction in which the rotation axis extends. The guide surface is set so as to intersect within a region surrounded by a contact portion with respect to the rotation shaft in the rotation shaft facing portion when viewed from a direction that is perpendicular to the first direction. It is preferred that

  According to this, along with the change in the inclination angle of the swash plate, the intersection of the normal or normal line of the guide surface (force acting on the moving body from the connecting member on the guide surface) and the rotation axis of the rotation shaft is It arrange | positions in the area | region enclosed by the contact | abutting part with respect to the rotating shaft in a rotating shaft opposing part in an axial direction. At this time, the resultant force of the force that acts on the moving body from the connecting member on the guide surface and the force that moves the moving body in the axial direction of the rotating shaft due to the pressure in the control pressure chamber is generated on a vertical line including the intersection point. A reverse force that balances the resultant force is also generated on this vertical line. As a result, since all the forces applied to the moving body are generated and balanced on the vertical line including the intersection, the moving body does not generate a moment that tilts the moving body with respect to the rotation axis of the rotating shaft. Therefore, when the inclination angle of the swash plate is decreased from the maximum inclination angle, it is possible to suppress the occurrence of a twist between the moving body and the rotating shaft, and the inclination angle of the swash plate can be reduced from the maximum inclination angle. It can be done smoothly.

  In the variable capacity swash plate type compressor, the swash plate has an insertion hole through which the rotating shaft is inserted, and the moving body and the swash plate are between the moving body and the swash plate. The swash plate is connected via a connecting member provided on the outer peripheral side of the insertion hole, and the swash plate guides the connecting member and moves the slant as the moving body moves in the direction along the rotation axis. A guide surface that changes a tilt angle of the plate, and when the tilt angle of the swash plate is a maximum tilt angle, a perpendicular or normal line of the guide surface and the rotation axis are orthogonal to a direction in which the rotation axis extends. The guide surface is set so as to intersect within a region surrounded by a contact portion with respect to the partition body in the partition body facing portion when viewed from a direction that is perpendicular to the first direction. It is preferred that

  According to this, with the change of the inclination angle of the swash plate, a force acting on the swash plate from the connecting member on the guide surface acts on the normal or normal line of the guide surface. Then, in the direction in which the perpendicular line or the normal line extends, the reaction force of the force that acts on the swash plate from the coupling member on the guide surface acts on the moving body from the coupling member. Here, along with the change of the inclination angle of the swash plate, the intersection of the normal or normal line of the guide surface (force acting on the moving body from the connecting member) and the rotation axis of the rotating shaft is divided in the axial direction of the rotating shaft. It arrange | positions in the area | region enclosed by the contact part with respect to the division body in a body opposing part. At this time, the resultant force of the force that acts on the moving body from the connecting member and the force that moves the moving body in the axial direction of the rotating shaft due to the pressure in the control pressure chamber is generated on the vertical line including the intersection, and balances this resultant force. A reverse force is also generated on this vertical line. As a result, since all the forces applied to the moving body are generated and balanced on the vertical line including the intersection, the moving body does not generate a moment that tilts the moving body with respect to the rotation axis of the rotating shaft. Therefore, when the inclination angle of the swash plate is decreased from the maximum inclination angle, it is possible to suppress the occurrence of a twist between the moving body and the rotating shaft, and the inclination angle of the swash plate can be reduced from the maximum inclination angle. It can be done smoothly.

  In the variable capacity swash plate type compressor, the swash plate has an insertion hole through which the rotating shaft is inserted, and the moving body and the swash plate are between the moving body and the swash plate. The movable body is coupled via a coupling member provided on the outer peripheral side with respect to the insertion hole, and the movable body guides the coupling member and is inclined with the movement of the movable body in the direction along the rotation axis. A guide surface that changes a tilt angle of the plate, and when the tilt angle of the swash plate is a maximum tilt angle, a perpendicular or normal line of the guide surface and the rotation axis are orthogonal to a direction in which the rotation axis extends. The guide surface is set so as to intersect within a region surrounded by a contact portion with respect to the partition body in the partition body facing portion when viewed from a direction that is perpendicular to the first direction. It is preferred that

  According to this, along with the change in the inclination angle of the swash plate, the intersection of the normal or normal line of the guide surface (force acting on the moving body from the connecting member on the guide surface) and the rotation axis of the rotation shaft is It arrange | positions in the area | region enclosed by the contact part with respect to the division body in a partition body opposing part in an axial direction. At this time, the resultant force of the force that acts on the moving body from the connecting member on the guide surface and the force that moves the moving body in the axial direction of the rotating shaft due to the pressure in the control pressure chamber is generated on a vertical line including the intersection point. A reverse force that balances the resultant force is also generated on this vertical line. As a result, since all the forces applied to the moving body are generated and balanced on the vertical line including the intersection, the moving body does not generate a moment that tilts the moving body with respect to the rotation axis of the rotating shaft. Therefore, when the inclination angle of the swash plate is decreased from the maximum inclination angle, it is possible to suppress the occurrence of a twist between the moving body and the rotating shaft, and the inclination angle of the swash plate can be reduced from the maximum inclination angle. It can be done smoothly.

  In the variable displacement swash plate compressor, the guide surface includes a flat portion, and a perpendicular to the guide surface and the rotation axis are in a direction orthogonal to a direction in which the rotation axis extends, and the first When viewed from a direction orthogonal to the direction 1, it is preferable that the plane portion is set so as to intersect within a region surrounded by a contact portion with the rotation shaft in the rotation shaft facing portion.

  According to this, the shape of a guide surface can be made into a simple shape. Therefore, since it is not necessary to complicate the shape of the guide surface in order to suppress the moment that tilts the moving body with respect to the rotation axis of the rotation shaft, the productivity can be improved.

  In the variable displacement swash plate compressor, the guide surface includes a flat portion, and a perpendicular to the guide surface and the rotation axis are in a direction orthogonal to a direction in which the rotation axis extends, and the first When viewed from a direction orthogonal to the direction 1, it is preferable that the plane portion is set so as to intersect within a region surrounded by a contact portion with the partition body in the partition body facing portion.

  According to this, the shape of a guide surface can be made into a simple shape. Therefore, since it is not necessary to complicate the shape of the guide surface in order to suppress the moment that tilts the moving body with respect to the rotation axis of the rotation shaft, the productivity can be improved.

  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 expanded sectional view when the inclination of a swash plate is the minimum inclination. The schematic diagram which shows the relationship between a control pressure chamber, a pressure regulation chamber, a suction chamber, and a discharge chamber. The sectional side view which shows a variable capacity | capacitance type swash plate type compressor when the inclination angle of a swash plate is a maximum inclination angle. The expanded sectional view when the inclination of a swash plate is a maximum inclination. The expanded sectional view when the inclination-angle of the swash plate in 2nd Embodiment is a minimum inclination-angle. The expanded sectional view when the inclination of a swash plate is a maximum inclination. The expanded sectional view when the inclination-angle of the swash plate in 3rd Embodiment is a maximum inclination-angle. The expanded sectional view when the inclination-angle of the swash plate in another embodiment is a maximum inclination-angle.

(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 is inserted. The swash plate 23 is attached to the rotating shaft 21 by inserting the rotating shaft 21 into the insertion hole 23 a.

  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 reciprocable 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 penetrates 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.

  In the swash plate chamber 24, there is provided an actuator 30 capable of changing the inclination angle of the swash plate 23 with respect to a first direction (vertical direction in FIG. 1) perpendicular to the rotation axis L of the rotation shaft 21 of 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 partition body 31 is formed with an insertion hole 31h into which the rotation shaft 21 is inserted. Then, the rotating shaft 21 is inserted into the insertion hole 31 h and press-fitted and fixed, so that the partition body 31 is integrated with the rotating 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 moving body 32 can rotate integrally with the rotating shaft 21. The space between the inner peripheral surface of the cylindrical portion 32 b and the outer peripheral surface 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.

  As shown in FIG. 2, the clearance C <b> 1 between the inner peripheral surface of the insertion hole 32 e of the bottom portion 32 a and the outer peripheral surface of the rotary shaft 21 is between the inner peripheral surface of the cylindrical portion 32 b and the outer peripheral surface of the partition body 31. It is smaller than the clearance C2. The inner peripheral surface of the insertion hole 32e in the bottom portion 32a is a rotating shaft facing portion 32s that slides on the rotating shaft 21 as the moving body 32 moves in the axial direction of the rotating shaft 21.

  On the outer peripheral surface of the rotation shaft 21, a rotation shaft recess 21a extending in an annular shape is formed. The rotation shaft recess 21 a is positioned between the insertion hole 31 h of the partition 31 and the seal member 34 in the axial direction of the rotation shaft 21 when the bottom 32 a of the moving body 32 comes closest to the partition 31. The length along the axial direction of the rotating shaft 21 is set. When the bottom 32a of the moving body 32 is closest to the partition 31, the end on the partition 31 side, which is one end in the axial direction of the rotation shaft 21 in the rotation shaft facing portion 32s, is a rotation shaft recess. It comes to 21a.

  As shown in FIG. 1, the rotary shaft 21 is formed with an in-shaft passage 28 for supplying the refrigerant gas from the discharge chamber 15 b to the control pressure chamber 35. The in-axis passage 28 includes a first in-axis passage 28 a that extends along the axial direction of the rotary shaft 21, and a second in-axis passage 28 b that communicates with the first in-axis passage 28 a and extends along the radial direction of the rotary shaft 21. And is formed from. The rear end of the first in-axis passage 28a opens to the pressure adjustment chamber 15c. One end of the second shaft passage 28b communicates with the tip of the first shaft passage 28a, and the other end (the end on the control pressure chamber 35 side of the second shaft passage 28b) opens into the rotary shaft recess 21a. ing. Therefore, the control pressure chamber 35 and the pressure adjusting chamber 15c communicate with each other via the first in-axis passage 28a, the second in-axis passage 28b, and the rotary shaft recess 21a.

  As shown in FIG. 3, 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.

  Introduction of refrigerant gas from the discharge chamber 15b to the control pressure chamber 35 via the air supply passage 37, the pressure adjustment chamber 15c, the first in-shaft passage 28a, the second in-shaft passage 28b, and the rotary shaft recess 21a; 35 is discharged to the suction chamber 15a through the rotary shaft recess 21a, the second shaft passage 28b, the first shaft passage 28a, the pressure adjustment chamber 15c, and the extraction passage 36, and the pressure of 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 connecting portion 32 c that protrudes toward the swash plate 23 is provided at the tip of the cylindrical portion 32 b of the moving body 32. A cylindrical connecting pin 43 as a connecting member is press-fitted and fixed to the connecting portion 32c. Further, a long hole-shaped insertion hole 23h into which the connecting pin 43 is inserted is formed on the lower end side (lower side in FIG. 1) which is the outer peripheral side of the insertion hole 23a of the swash plate 23. The connecting portion 32 c is connected to the lower end side of the swash plate 23 via the connecting pin 43. The connecting pin 43 is slidably held in the insertion hole 23h.

  As shown in FIG. 2, the insertion hole 23 h has a guide surface 44 that guides the connecting pin 43 and changes the inclination angle of the swash plate 23 as the moving body 32 moves in the axial direction of the rotating shaft 21. The guide surface 44 is located on the moving body 32 side in the insertion hole 23h. Further, the guide surface 44 has a flat surface portion 44 a that is inclined with respect to the moving direction of the moving body 32 (the axial direction of the rotating shaft 21).

  When the valve opening degree of the control valve 37s is decreased, the control pressure chamber is supplied from the discharge chamber 15b through the air supply passage 37, the pressure adjustment chamber 15c, the first in-shaft passage 28a, the second in-shaft passage 28b, and the rotary shaft recess 21a. The flow rate of the refrigerant gas introduced into 35 is reduced. The refrigerant gas is discharged from the control pressure chamber 35 to the suction chamber 15a through the rotary shaft recess 21a, the second in-axis passage 28b, the first in-axis passage 28a, the pressure adjustment chamber 15c, and the extraction passage 36. The pressure in the control pressure chamber 35 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 causes the moving body 32 to move through the connecting pin 43 by the compression reaction 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.

  When the moving body 32 moves so that the bottom 32a of the moving body 32 approaches the partition body 31, the connecting pin 43 slides inside the insertion hole 23h, and the swash plate 23 swings around the first swing center M1. Move. 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, the control pressure chamber is supplied from the discharge chamber 15b through the air supply passage 37, the pressure adjustment chamber 15c, the first in-shaft passage 28a, the second in-shaft passage 28b, and the rotary shaft recess 21a. The flow rate of the refrigerant gas introduced into 35 increases. For this reason, the pressure in the control pressure chamber 35 becomes substantially equal to the pressure in the discharge chamber 15b. Therefore, the pressure difference between the control pressure chamber 35 and the swash plate chamber 24 increases, so that the moving body 32 pulls the swash plate 23 via the connecting pin 43, and the bottom 32 a of the moving body 32 is separated from the partition body 31. To move.

  As shown in FIG. 4, when the moving body 32 moves so that the bottom portion 32a of the moving body 32 is separated from the partition body 31, the connecting pin 43 slides inside the insertion hole 23h, and the swash plate 23 is moved to the first position. The swash plate 23 oscillates in the direction opposite to the oscillating direction when the inclination angle of the swash plate 23 is decreased around the oscillating center M1. 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.

  As shown in FIG. 5, along with the change in the inclination angle of the swash plate 23, the perpendicular line L <b> 1 of the plane portion 44 a and the rotation axis line L of the rotation shaft 21 are orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends. A point that intersects when viewed from a direction (depth direction of the paper surface in FIG. 5) orthogonal to the first direction (vertical direction in FIG. 5) is defined as an intersection point P1. When the inclination angle of the swash plate 23 is the maximum inclination angle, the position of the intersection P1 is a direction orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends and is orthogonal to the first direction. When viewed from the direction, the inclination θ1 of the flat surface portion 44a is set so as to be disposed in the region Z1 surrounded by the contact portion with the rotation shaft 21 in the rotation shaft facing portion 32s. The inclination θ1 is an inclination with respect to a direction orthogonal to the axial direction of the rotation shaft 21 when the inclination angle of the swash plate 23 is the maximum inclination angle. Further, the region Z1 is a region where a contact portion of the rotation shaft facing portion 32s with the rotation shaft 21 extends in the axial direction of the rotation shaft 21, and is a region indicated by dot hatching in FIG.

Next, the operation of the first embodiment will be described.
As shown in FIG. 2, when the inclination angle of the swash plate 23 is the minimum inclination angle, one axial end portion of the rotation shaft 21 of the rotation shaft facing portion 32s faces the rotation shaft recess 21a. Therefore, even if a moment that tilts the moving body 32 with respect to the axial direction of the rotating shaft 21 acts on the moving body 32, the rotating shaft facing portion 32 s and the rotating shaft 21 are replaced by the rotating shaft facing portion 32 s and the rotating shaft 21. It is easy to avoid that the contact point with the contact point at two points on both sides of the rotating shaft 21 is avoided. As a result, when the inclination angle of the swash plate 23 is increased from the minimum inclination angle, the occurrence of twisting between the moving body 32 and the rotating shaft 21 is suppressed, and the inclination angle of the swash plate 23 is reduced from the minimum inclination angle. Increases smoothly.

  As shown in FIG. 5, when the inclination angle of the swash plate 23 is the maximum inclination angle, the rotation shaft facing portion 32s does not face the rotation shaft concave portion 21a, so that the contact area of the rotation shaft facing portion 32s with the rotation shaft 21 is The inclination angle of the swash plate 23 is larger than when the inclination angle is the minimum. Therefore, wear between the rotation shaft facing portion 32s and the rotation shaft 21 when the inclination angle of the swash plate 23 is the maximum inclination angle is suppressed, and the inclination angle of the swash plate 23 smoothly decreases from the maximum inclination angle.

  Further, along with the change in the inclination angle of the swash plate 23, a force F0 acting on the swash plate 23 from the connecting pin 43 in the flat surface portion 44a acts on the perpendicular L1 of the flat surface portion 44a. A force F1, which is a reaction force of the force F0, acts on the moving body 32 from the connecting pin 43 in the direction in which the perpendicular line L1 extends. Here, with the change of the inclination angle of the swash plate 23, the intersection P1 is arranged in a region Z1 surrounded by a contact portion of the rotation shaft facing portion 32s with the rotation shaft 21 in the axial direction of the rotation shaft 21.

  At this time, the resultant force F3 of the force F1 that acts on the moving body 32 from the connecting pin 43 and the force F2 that moves the moving body 32 in the axial direction of the rotary shaft 21 due to the pressure of the control pressure chamber 35 is a vertical including the intersection P1. A reverse force F4 generated on the line L2 and balanced with the resultant force F3 is also generated on the vertical line L2. As a result, since all the forces applied to the moving body 32 are generated and balanced on the vertical line L2 including the intersection point P1, the moving body 32 has a moment that tilts the moving body 32 with respect to the axial direction of the rotating shaft 21. Does not occur. Therefore, when the inclination angle of the swash plate 23 is decreased from the maximum inclination angle, the occurrence of twisting between the moving body 32 and the rotating shaft 21 is suppressed, and the inclination angle of the swash plate 23 is decreased from the maximum inclination angle. Is done smoothly. In addition, the inclination angle of the swash plate 23 can be easily changed to the maximum inclination angle.

In the first embodiment, the following effects can be obtained.
(1) The rotating shaft 21 has a rotating shaft recess 21a. When the inclination angle of the swash plate 23 is the minimum inclination angle, one end portion of the rotation shaft facing portion 32s in the direction along the rotation axis of the rotation shaft 21 faces the rotation shaft recess 21a. According to this, when the inclination angle of the swash plate 23 is the maximum inclination angle, the rotation shaft facing portion 32s does not face the rotation shaft concave portion 21a, so that the contact area of the rotation shaft facing portion 32s with the rotation shaft 21 is the swash plate. The tilt angle of 23 is larger than the minimum tilt angle. For this reason, it is possible to suppress wear between the rotation shaft facing portion 32s and the rotation shaft 21 when the inclination angle of the swash plate 23 is the maximum inclination angle, and to smoothly reduce the inclination angle of the swash plate 23 from the maximum inclination angle. be able to. Further, when the inclination angle of the swash plate 23 is the minimum inclination angle, one end portion of the rotation shaft facing portion 32s in the direction along the rotation axis of the rotation shaft 21 faces the rotation shaft recess 21a. Therefore, even if a moment that tilts the moving body 32 with respect to the rotation axis of the rotating shaft 21 acts on the moving body 32, the rotating shaft facing portion 32 s and the rotating shaft 21 are replaced by the rotating shaft facing portion 32 s and the rotating shaft 21. It is possible to easily avoid the contact point between the two contact points at two points on both sides of the rotating shaft 21. As a result, when the tilt angle of the swash plate 23 is increased from the minimum tilt angle, it is possible to suppress the occurrence of a twist between the moving body 32 and the rotating shaft 21, and the tilt angle of the swash plate 23 can be reduced. The minimum tilt angle can be increased smoothly. From the above, the inclination angle of the swash plate 23 can be changed smoothly.

  (2) The end of the in-shaft passage 28 on the control pressure chamber 35 side opens into the rotating shaft recess 21a. According to this, as compared with the case where the end of the in-shaft passage 28 on the control pressure chamber 35 side is disposed at a position shifted in the axial direction of the rotating shaft 21 with respect to the rotating shaft recess 21a, the variable capacity type. The physique along the axial direction of the rotating shaft 21 in the swash plate compressor 10 can be reduced in size.

  (3) The swash plate 23 has a guide surface 44 (a plane portion 44 a) that guides the connecting pin 43 and changes the inclination angle of the swash plate 23 as the moving body 32 moves in the axial direction of the rotating shaft 21. When the inclination angle of the swash plate 23 is the maximum inclination angle, the perpendicular L1 of the flat surface portion 44a and the rotation axis L of the rotation shaft 21 are orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends. Further, the planar portion 44a is set so as to intersect within the region Z1 surrounded by the contact portion with the rotation shaft 21 in the rotation shaft facing portion 32s when viewed from the direction orthogonal to the first direction. According to this, with the change in the inclination angle of the swash plate 23, the force F0 acting on the swash plate 23 from the connecting pin 43 in the flat surface portion 44a acts on the perpendicular L1 of the flat surface portion 44a. A force F1, which is a reaction force of the force F0, acts on the moving body 32 from the connecting pin 43 in the direction in which the perpendicular line L1 extends. Here, along with the change of the inclination angle of the swash plate 23, the intersection P1 between the perpendicular line L1 (the force F1 acting on the moving body 32 from the connecting pin 43) of the plane portion 44a and the rotational axis L of the rotary shaft 21 is the rotational axis. In the axial direction of 21, it is arranged in a region Z <b> 1 surrounded by a contact portion with the rotation shaft 21 in the rotation shaft facing portion 32 s. At this time, the resultant force F3 of the force F1 that acts on the moving body 32 from the connecting pin 43 and the force F2 that moves the moving body 32 in the axial direction of the rotary shaft 21 due to the pressure of the control pressure chamber 35 is a vertical including the intersection P1. A reverse force F4 generated on the line L2 and balanced with the resultant force F3 is also generated on the vertical line L2. As a result, since all the forces applied to the moving body 32 are generated and balanced on the vertical line L2 including the intersection P1, the moving body 32 does not generate a moment that tilts the moving body 32 with respect to the moving direction. Therefore, when the inclination angle of the swash plate 23 is decreased from the maximum inclination angle, it is possible to suppress the occurrence of a twist between the moving body 32 and the rotary shaft 21, and the swash plate 23 from the maximum inclination angle can be suppressed. The tilt angle can be reduced smoothly.

  (4) The guide surface 44 has a flat surface portion 44 a that is inclined with respect to the moving direction of the moving body 32. According to this, the shape of the guide surface 44 can be a simple shape. Therefore, since it is not necessary to complicate the shape of the guide surface 44 in order to suppress the moment that tilts the moving body 32 with respect to the axial direction of the rotating shaft 21, the productivity can be improved.

  (5) In a double-headed piston swash plate compressor that employs the double-headed piston 25, the swash plate chamber 24 is controlled to change the inclination angle of the swash plate 23, as in a variable displacement swash plate 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 being increased excessively. it can.

(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 clearance C <b> 1 between the inner peripheral surface of the insertion hole 32 e of the bottom portion 32 a and the outer peripheral surface of the rotating shaft 21 is between the inner peripheral surface of the cylindrical portion 32 b and the outer peripheral surface of the partition body 31. It is larger than the clearance C2. And the internal peripheral surface of the cylindrical part 32b becomes the division body opposing part 32S which slides on the division body 31 with the movement to the axial direction of the rotating shaft 21 of the mobile body 32. As shown in FIG.

  A moving body recess 21A extending in an annular shape is formed on the inner peripheral surface of the cylindrical portion 32b. 21 A of moving body recessed parts are formed in the edge part by the side of the bottom part 32a of the moving body 32 in the cylindrical part 32b. The moving body recess 21A is positioned between the bottom 32a of the moving body 32 and the seal member 33 in the axial direction of the rotating shaft 21 when the bottom 32a of the moving body 32 comes closest to the partition body 31. The length along the axial direction of the rotating shaft 21 is set. When the bottom 32a of the moving body 32 comes closest to the partition 31, the end on the bottom 32a side of the moving body 32, which is one end in the axial direction of the rotating shaft 21 in the partition 31, is a moving body recess. Come to 21A.

  As shown in FIG. 7, along with the change in the inclination angle of the swash plate 23, the perpendicular line L <b> 1 of the plane portion 44 </ b> A and the rotation axis line L of the rotation shaft 21 are orthogonal to the direction in which the rotation axis line L of the rotation shaft 21 extends. A point that intersects when viewed from a direction (depth direction of the paper surface in FIG. 7) orthogonal to the first direction (vertical direction in FIG. 7) is defined as an intersection point P2. When the inclination angle of the swash plate 23 is the maximum inclination angle, the position of the intersection P2 is a direction orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends and is orthogonal to the first direction. When viewed from the direction, the inclination θ2 of the flat surface portion 44A is set so as to be disposed in the region Z2 surrounded by the contact portion with the partition body 31 in the partition body facing portion 32S. The inclination θ2 is an inclination with respect to a direction orthogonal to the axial direction of the rotation shaft 21 when the inclination angle of the swash plate 23 is the maximum inclination angle. Further, the region Z2 is a region where a contact portion with respect to the partition body 31 in the partition body facing portion 32S extends in the axial direction of the rotation shaft 21, and is a region indicated by dot hatching in FIG.

Next, the operation of the second embodiment will be described.
As shown in FIG. 6, when the inclination angle of the swash plate 23 is the minimum inclination angle, one end portion in the axial direction of the rotating shaft 21 in the partition body 31 faces the moving body recess 21 </ b> A. For this reason, even if the moment which inclines the moving body 32 with respect to the axial direction of the rotating shaft 21 acts on the moving body 32, the division body opposing part 32S and the division body 31 are divided into the division body opposing part 32S and the division body 31. It is easy to avoid that the contact point with the contact point at two points on both sides of the rotating shaft 21 is avoided. As a result, when the inclination angle of the swash plate 23 is increased from the minimum inclination angle, the occurrence of a twist between the moving body 32 and the partition body 31 is suppressed, and the inclination angle of the swash plate 23 is reduced from the minimum inclination angle. Increases smoothly.

  As shown in FIG. 7, when the inclination angle of the swash plate 23 is the maximum inclination angle, the partition body 31 does not face the moving body recess 21 </ b> A. Therefore, the contact area of the partition body facing portion 32 </ b> S with the partition body 31 is The tilt angle of 23 is larger than the minimum tilt angle. For this reason, when the inclination angle of the swash plate 23 is the maximum inclination angle, wear between the partition body facing portion 32S and the partition body 31 is suppressed, and the inclination angle of the swash plate 23 smoothly decreases from the maximum inclination angle.

  Further, with the change in the inclination angle of the swash plate 23, a force F0 acting on the swash plate 23 from the connecting pin 43 in the flat surface portion 44A acts on the perpendicular L1 of the flat surface portion 44A. A force F1, which is a reaction force of the force F0, acts on the moving body 32 from the connecting pin 43 in the direction in which the perpendicular line L1 extends. Here, along with the change in the inclination angle of the swash plate 23, the intersection point P <b> 2 is arranged in a region Z <b> 2 surrounded by a contact portion with the partition body 31 in the partition body facing portion 32 </ b> S in the axial direction of the rotating shaft 21.

  At this time, the resultant force F3 of the force F1 that acts on the moving body 32 from the connecting pin 43 and the force F2 that moves the moving body 32 in the axial direction of the rotary shaft 21 due to the pressure in the control pressure chamber 35 is a vertical including the intersection P2. A reverse force F4 generated on the line L2 and balanced with the resultant force F3 is also generated on the vertical line L2. As a result, since all the forces applied to the moving body 32 are generated and balanced on the vertical line L2 including the intersection point P1, the moving body 32 has a moment that tilts the moving body 32 with respect to the axial direction of the rotating shaft 21. Does not occur. Therefore, when the inclination angle of the swash plate 23 is decreased from the maximum inclination angle, the occurrence of twisting between the moving body 32 and the partition body 31 is suppressed, and the inclination angle of the swash plate 23 is decreased from the maximum inclination angle. Is done smoothly. In addition, the inclination angle of the swash plate 23 can be easily changed to the maximum inclination angle.

Therefore, according to the second embodiment, in addition to the same effects as the effects (2) to (5) of the first embodiment, the following effects can be obtained.
(6) The mobile body 32 is formed with a mobile body recess 21A. When the inclination angle of the swash plate 23 is the minimum inclination angle, one end portion in the axial direction of the rotating shaft 21 in the partitioning body 31 faces the moving body recess 21A. According to this, when the inclination angle of the swash plate 23 is the maximum inclination angle, the partition body 31 does not face the moving body recess 21A, so that the contact area of the partition body facing portion 32S with the partition body 31 is The tilt angle is larger than that at the minimum tilt angle. For this reason, it is possible to suppress wear between the partition body facing portion 32S and the partition body 31 when the inclination angle of the swash plate 23 is the maximum inclination angle, and to smoothly reduce the inclination angle of the swash plate 23 from the maximum inclination angle. be able to. Further, when the inclination angle of the swash plate 23 is the minimum inclination angle, one end portion of the partition body 31 in the axial direction of the rotation shaft 21 faces the moving body recess 21A. For this reason, even if the moment which inclines the moving body 32 with respect to the axial direction of the rotating shaft 21 acts on the moving body 32, the division body opposing part 32S and the division body 31 are divided into the division body opposing part 32S and the division body 31. It is possible to easily avoid the contact point between the two contact points at two points on both sides of the rotating shaft 21. As a result, when the inclination angle of the swash plate 23 is increased from the minimum inclination angle, it is possible to suppress the occurrence of twisting between the moving body 32 and the partition body 31. The minimum tilt angle can be increased smoothly. From the above, the inclination angle of the swash plate 23 can be changed smoothly.

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

  As shown in FIG. 8, the connecting portion 32c is formed with an insertion hole 32h having a long hole shape through which the connecting pin 43 can be inserted. Further, a connecting pin 43 is press-fitted and fixed to the lower end side (lower side in FIG. 8) that is the outer peripheral side of the insertion hole 23 a of the swash plate 23. The connecting portion 32 c is connected to the lower end side of the swash plate 23 via the connecting pin 43. The connecting pin 43 is slidably held in the insertion hole 32h.

  The insertion hole 32 h has a guide surface 54 that guides the connecting pin 43 and changes the inclination angle of the swash plate 23 as the moving body 32 moves in the axial direction of the rotating shaft 21. The guide surface 54 is located on the opposite side to the moving body 32 in the insertion hole 32h. Furthermore, the guide surface 54 has a flat surface portion 54 a that is inclined with respect to the moving direction of the moving body 32 (the axial direction of the rotating shaft 21). The flat surface portion 54a extends linearly so as to approach the rotation axis L of the rotation shaft 21 as the distance from the moving body 32 increases.

  Along with the change of the inclination angle of the swash plate 23, a point where the perpendicular line L1 of the plane part 54a (the force F1 acting on the moving body 32 from the connecting pin 43 in the plane part 54a) intersects with the rotation axis L of the rotary shaft 21 is defined as an intersection point P3. . When the inclination angle of the swash plate 23 is the maximum inclination angle, the position of the intersection P3 is a direction orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends and is orthogonal to the first direction. When viewed from the direction, the inclination θ3 of the flat surface portion 54a is set so as to be disposed in the region Z1 surrounded by the contact portion with the rotation shaft 21 in the rotation shaft facing portion 32s. The inclination θ3 is an inclination with respect to a direction orthogonal to the axial direction of the rotating shaft 21 when the inclination angle of the swash plate 23 is the maximum inclination angle.

Next, the operation of the third embodiment will be described.
Along with the change of the inclination angle of the swash plate 23, the intersection P3 is arranged in a region Z1 surrounded by a contact portion of the rotation shaft facing portion 32s with the rotation shaft 21 in the axial direction of the rotation shaft 21. At this time, the resultant force F3 of the force F1 acting on the moving body 32 from the connecting pin 43 in the plane portion 54a and the force F2 for moving the moving body 32 in the axial direction of the rotating shaft 21 due to the pressure of the control pressure chamber 35 is an intersection. A reverse force F4 generated on the vertical line L2 including P3 and balanced with the resultant force F3 is also generated on the vertical line L2. As a result, since all the forces applied to the moving body 32 are generated and balanced on the vertical line L2 including the intersection P3, the moving body 32 has a moment for tilting the moving body 32 with respect to the axial direction of the rotating shaft 21. Does not occur. Therefore, when the inclination angle of the swash plate 23 is decreased from the maximum inclination angle, the occurrence of twisting between the moving body 32 and the rotating shaft 21 is suppressed, and the inclination angle of the swash plate 23 is decreased from the maximum inclination angle. Is done smoothly. In addition, the inclination angle of the swash plate 23 can be easily changed to the maximum inclination angle.

Therefore, according to the third embodiment, the following effects can be obtained in addition to the effects (1), (2), (4), and (5) of the first embodiment.
(7) The moving body 32 has a guide surface 54 (a flat surface portion 54a) that guides the connecting pin 43 and changes the inclination angle of the swash plate 23 as the moving body 32 moves in the axial direction of the rotary shaft 21. When the inclination angle of the swash plate 23 is the maximum inclination angle, the perpendicular L1 of the flat surface portion 54a and the rotation axis L of the rotation shaft 21 are orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends. In addition, when viewed from a direction orthogonal to the first direction, the planar portion 54a is set so as to intersect within the region Z1 surrounded by the contact portion with the rotation shaft 21 in the rotation shaft facing portion 32s. According to this, with the change of the inclination angle of the swash plate 23, the intersection P3 is arranged in the region Z1 surrounded by the contact portion of the rotation shaft opposing portion 32s with the rotation shaft 21 in the axial direction of the rotation shaft 21. . At this time, the resultant force F3 of the force F1 acting on the moving body 32 from the connecting pin 43 in the plane portion 54a and the force F2 for moving the moving body 32 in the axial direction of the rotating shaft 21 due to the pressure of the control pressure chamber 35 is an intersection. A reverse force F4 generated on the vertical line L2 including P3 and balanced with the resultant force F3 is also generated on the vertical line L2. As a result, since all the forces applied to the moving body 32 are generated and balanced on the vertical line L2 including the intersection P3, the moving body 32 has a moment for tilting the moving body 32 with respect to the axial direction of the rotating shaft 21. Does not occur. Therefore, when the inclination angle of the swash plate 23 is decreased from the maximum inclination angle, it is possible to suppress the occurrence of a twist between the moving body 32 and the rotary shaft 21, and the swash plate 23 from the maximum inclination angle can be suppressed. The tilt angle can be reduced smoothly.

In addition, you may change the said embodiment as follows.
In the third embodiment, as shown in FIG. 9, the clearance C1 between the inner peripheral surface of the insertion hole 32e of the bottom portion 32a and the outer peripheral surface of the rotary shaft 21 is separated from the inner peripheral surface of the cylindrical portion 32b. It may be larger than the clearance C <b> 2 between the outer peripheral surface of the body 31. And the inner peripheral surface of the cylindrical part 32b may become the division body opposing part 32S which slides the division body 31 with the movement to the axial direction of the rotating shaft 21 of the moving body 32. FIG. Furthermore, the moving body recessed part 21A may be formed in the inner peripheral surface of the cylindrical part 32b. In this case, along with the change of the inclination angle of the swash plate 23, the perpendicular L1 of the flat surface portion 54A and the rotation axis L of the rotation shaft 21 are orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends, Further, an intersection point P4 is a point that intersects when viewed from a direction (depth direction of the paper surface in FIG. 9) orthogonal to the first direction (vertical direction in FIG. 9). When the inclination angle of the swash plate 23 is the maximum inclination angle, the position of the intersection point P4 is a direction orthogonal to the direction in which the rotation axis L of the rotation shaft 21 extends and is orthogonal to the first direction. When viewed from the direction, the inclination θ4 of the flat surface portion 54A is set so that the flat portion 54A is disposed in a region Z2 surrounded by a contact portion with the partition body 31 in the partition body facing portion 32S. The inclination θ4 is an inclination with respect to a direction orthogonal to the axial direction of the rotating shaft 21 when the inclination angle of the swash plate 23 is the maximum inclination angle.

  In the above embodiments, the guide surfaces 44 and 54 may have a curved surface portion. The curved surface portion has an arc shape that passes on a virtual circle. Along with the change in the inclination angle of the swash plate 23, the force acting on the swash plate 23 from the connection pin 43 acts on the moving body 32 from the connection pin 43 in the direction in which the normal line of the curved surface portion extends. Here, along with the change in the inclination angle of the swash plate 23, the intersections between the normal line of the curved surface portion (the force acting on the moving body 32 from the connecting pin 43) and the rotation axis L of the rotation shaft 21 are regions Z1, Z2. Placed inside. According to this, even when the inclination angle of the swash plate 23 is changed, when the connecting pin 43 is guided to the curved surface portion, the intersection points P1, P2, P3, and P4 are in the region Z1, in the axial direction of the rotating shaft 21. It becomes difficult to arrange outside Z2. Therefore, even if the tilt angle of the swash plate 23 is changed, the moment that tilts the moving body 32 with respect to the axial direction of the rotary shaft 21 is easily suppressed, and the tilt angle of the swash plate 23 can be easily changed smoothly. it can.

In each of the above embodiments, the guide surfaces 44 and 54 may be cam surfaces in which a flat surface portion and a curved surface portion are combined.
In the first and second embodiments, the swash plate 23 may be provided with a groove through which the connecting pin 43 can be inserted, for example, instead of the insertion hole 23h.

In the third embodiment, the connecting portion 32c may be provided with a groove through which the connecting pin 43 can be inserted, for example, instead of the insertion hole 32h.
In the first and second embodiments, the connecting pin 43 may be fixed to the connecting portion 32c by screwing.

In the third embodiment, the connecting pin 43 may be fixed to the swash plate 23 by screwing.
In the first and second embodiments, the connecting pin 43 does not have to be fixed to the connecting portion 32c. For example, the connecting pin 43 can be inserted into the insertion hole formed in the connecting portion 32c and slidable in the insertion hole. It may be held.

  In the third embodiment, the connecting pin 43 does not have to be fixed to the swash plate 23. For example, the connecting pin 43 is inserted into an insertion hole formed in the swash plate 23 and is slidably held in the insertion hole. May be.

In each of the above embodiments, the end on the control pressure chamber 35 side of the in-axis passage 28 may be disposed at a position shifted from the rotation shaft recess 21 a in the axial direction of the rotation shaft 21.
In the above embodiments, the guide surfaces 44 and 54 may be deleted.

  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.

  Z1, Z2 ... area, 10 ... variable displacement swash plate compressor, 11 ... housing, 12a ... first cylinder bore as cylinder bore, 13a ... second cylinder bore as cylinder bore, 14b, 15b ... discharge chamber, 21 ... rotating shaft, 21a ... rotating shaft recess, 21A ... moving body recess, 23 ... swash plate, 23a ... insertion hole, 24 ... swash plate chamber, 25 ... double-headed piston as piston, 26 ... shoe as conversion mechanism, 28 ... in-axis passage, 30 ... Actuator, 31 ... Partition body, 32 ... Moving body, 32s ... Rotating shaft facing portion, 32S ... Partition body facing portion, 35 ... Control pressure chamber, 37s ... Control valve as control mechanism, 40 ... Lug arm as link mechanism, 43 ... Connecting pins as connecting members, 44, 54, ... guide surfaces, 44a, 44A, 54a, 54A ... plane portions.

Claims (9)

A housing in which a discharge chamber, a swash plate chamber and a cylinder bore are formed; a rotating shaft rotatably supported by the housing; a swash plate rotatable in the swash plate chamber by rotation of the rotating shaft; the rotating shaft; A link mechanism provided between the swash plate and allowing a change in the inclination angle of the swash plate with respect to a first direction perpendicular to the rotation axis of the rotary shaft; and a piston accommodated in the cylinder bore so as to be reciprocally movable; 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, and controlling the actuator A control mechanism,
The actuator includes a partition provided on the rotation shaft, a movable body movable in a direction along the rotation axis in the swash plate chamber, and having a rotation shaft facing portion that slides on the rotation shaft; A variable capacity swash plate compressor having a control pressure chamber that is partitioned by a partition body and the mobile body and moves the mobile body by introducing a refrigerant from the discharge chamber,
The rotating shaft has a rotating shaft recess facing one end of the rotating shaft facing portion along the rotating axis when the tilt angle of the swash plate is a minimum tilt angle,
When the inclination angle of the swash plate is the minimum inclination angle, the length in the direction along the rotation axis of the contact area of the rotation axis facing portion with the rotation axis is the maximum inclination angle of the swash plate. A variable capacity swash plate type compressor characterized in that a length of a contact region of a rotating shaft facing portion with the rotating shaft is shorter than a length in a direction along the rotating axis.   The rotary shaft is formed with an in-shaft passage for supplying refrigerant from the discharge chamber to the control pressure chamber, and the end of the in-shaft passage on the control pressure chamber side is in the recess of the rotation shaft. The variable capacity swash plate compressor according to claim 1, wherein the compressor is open. A housing in which a discharge chamber, a swash plate chamber and a cylinder bore are formed; a rotating shaft rotatably supported by the housing; a swash plate rotatable in the swash plate chamber by rotation of the rotating shaft; the rotating shaft; A link mechanism provided between the swash plate and allowing a change in the inclination angle of the swash plate with respect to a first direction perpendicular to the rotation axis of the rotary shaft; and a piston accommodated in the cylinder bore so as to be reciprocally movable; 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, and controlling the actuator A control mechanism,
The actuator includes a partition provided on the rotation shaft, a movable body that is movable in a direction along the rotation axis in the swash plate chamber, and that has a partition body facing portion that slides on the partition. A variable capacity swash plate compressor having a control pressure chamber that is partitioned by a partition body and the mobile body and moves the mobile body by introducing a refrigerant from the discharge chamber,
The moving body has a moving body concave portion that faces one end of the partition body in the direction along the rotation axis when the inclination angle of the swash plate is a minimum inclination angle,
When the inclination angle of the swash plate is the minimum inclination angle, the length in the direction along the rotation axis of the contact area of the partition body facing portion with the partition body is the maximum when the inclination angle of the swash plate is the maximum inclination angle. A variable capacity swash plate compressor characterized in that it is shorter than a length in a direction along the rotation axis of a contact area of the partitioning body-facing portion with the partitioning body. The swash plate has an insertion hole through which the rotating shaft is inserted,
The moving body and the swash plate are connected via a connecting member provided on the outer peripheral side of the insertion hole between the moving body and the swash plate,
The swash plate has a guide surface that guides the connecting member and changes an inclination angle of the swash plate as the moving body moves in a direction along the rotation axis.
When the inclination angle of the swash plate is the maximum inclination angle, the perpendicular or normal line of the guide surface and the rotation axis are in a direction perpendicular to the direction in which the rotation axis extends and in the first direction The guide surface is set so as to intersect within a region surrounded by a contact portion with respect to the rotation shaft in the rotation shaft facing portion when viewed from a direction orthogonal to the rotation shaft. 2. The variable capacity swash plate compressor according to 2. The swash plate has an insertion hole through which the rotating shaft is inserted,
The moving body and the swash plate are connected via a connecting member provided on the outer peripheral side of the insertion hole between the moving body and the swash plate,
The moving body has a guide surface that guides the connecting member and changes an inclination angle of the swash plate as the moving body moves in a direction along the rotation axis.
When the inclination angle of the swash plate is the maximum inclination angle, the perpendicular or normal line of the guide surface and the rotation axis are in a direction perpendicular to the direction in which the rotation axis extends and in the first direction The guide surface is set so as to intersect within a region surrounded by a contact portion with respect to the rotation shaft in the rotation shaft facing portion when viewed from a direction orthogonal to the rotation shaft. 2. The variable capacity swash plate compressor according to 2. The swash plate has an insertion hole through which the rotating shaft is inserted,
The moving body and the swash plate are connected via a connecting member provided on the outer peripheral side of the insertion hole between the moving body and the swash plate,
The swash plate has a guide surface that guides the connecting member and changes an inclination angle of the swash plate as the moving body moves in a direction along the rotation axis.
When the inclination angle of the swash plate is the maximum inclination angle, the perpendicular or normal line of the guide surface and the rotation axis are in a direction perpendicular to the direction in which the rotation axis extends and in the first direction 4. The guide surface according to claim 3, wherein the guide surfaces are set so as to intersect within a region surrounded by a contact portion with the partition body in the partition body facing portion when viewed from a direction orthogonal to the partition body. Variable capacity swash plate compressor. The swash plate has an insertion hole through which the rotating shaft is inserted,
The moving body and the swash plate are connected via a connecting member provided on the outer peripheral side of the insertion hole between the moving body and the swash plate,
The moving body has a guide surface that guides the connecting member and changes an inclination angle of the swash plate as the moving body moves in a direction along the rotation axis.
When the inclination angle of the swash plate is the maximum inclination angle, the perpendicular or normal line of the guide surface and the rotation axis are in a direction perpendicular to the direction in which the rotation axis extends and in the first direction 4. The guide surface according to claim 3, wherein the guide surfaces are set so as to intersect within a region surrounded by a contact portion with the partition body in the partition body facing portion when viewed from a direction orthogonal to the partition body. Variable capacity swash plate compressor. The guide surface includes a flat portion,
The perpendicular of the guide surface and the rotation axis are opposite to the rotation axis when viewed from a direction orthogonal to the direction in which the rotation axis extends and from the direction orthogonal to the first direction. 6. The variable capacity swash plate compressor according to claim 4, wherein the flat portion is set so as to intersect within a region surrounded by a contact portion with respect to the rotation shaft in the portion. The guide surface includes a flat portion,
When the perpendicular of the guide surface and the rotation axis are in a direction orthogonal to the direction in which the rotation axis extends and from the direction orthogonal to the first direction, they face the compartments. The variable capacity swash plate compressor according to claim 6 or 7, wherein the flat portion is set so as to intersect within a region surrounded by a contact portion with respect to the partition body in the portion.