JP2009079587A - Variable capacity swash plate compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable capacity swash plate compressor capable of securing rigidity on a high load part and restraining the deformation of a sliding surface by simple structure. <P>SOLUTION: This variable capacity swash plate compressor is provided with a shaft supported freely to rotate in a housing through a crankcase, a swash plate 8 to rotate synchronously with the rotation of the shaft, and a piston reciprocating in a cylinder bore formed at the housing accompanied by the rotation of the swash plate. The swash plate has at least one non-symmetrical portion in the variable capacity swash plate compressor to vary a stroke quantity of the piston by changing an inclination of the swash plate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a variable displacement swash plate compressor that includes a plurality of pistons and a swash plate that is inclined with respect to a drive shaft in order to reciprocate these pistons, and that controls the discharge capacity by changing the inclination angle of the swash plate. About.

  In Patent Document 1, for the purpose of shortening the axial length, an end portion of a drive member is fitted into an opening provided in a substantially central portion of the socket plate, and the end portion of the drive member, the socket plate, Is disclosed to be connected and supported by a single connecting member. As a result, since the socket plate is supported at one point, when the control valve is operated, the socket plate swings around the connecting member and adjusts the piston stroke. Therefore, the socket plate and the drive member are separated from each other. There is almost no length, and the axial length of the compressor can be shortened accordingly.

Patent Document 2 has a swivel disk that is driven by an engine shaft and tilts in an adjustable manner with respect to the engine shaft. The swivel disk has an annular disk shape, and at least one radial point has a radial direction. A piston engine is disclosed that has an engagement space that opens inward and that engages the head of a driver that extends obliquely from the engine shaft. As a result, the inertial force of the driver located on the side is not further increased, the overall length is not too long, and the manufacturing cost can be reduced.
Japanese Patent Laid-Open No. 7-293435 JP 2000-510549 Gazette

  As proposed in Patent Document 1, the end of the drive member is fitted into an opening having a large opening at the center of the swash plate, and the end of the drive member and the swash plate are connected by a single connecting member. According to the supporting structure, a large opening is required in the swash plate in order to accommodate the end portion of the driving member, and the thickness of the sliding surface of the swash plate with the shoe and the inner wall of the opening becomes very thin. For this reason, if the compressive force from the piston acts on this thin sliding surface during operation, the sliding surface will be deformed so as to be greatly undulated, and the shoe will slide there, so the contact pressure with the shoe And the wear of the sliding surface was promoted. Similar problems also occur in Patent Document 2.

  In view of the above, the present invention is to provide a variable capacity swash plate compressor that has a simple structure, ensures rigidity in a high load portion, and can suppress deformation of a sliding surface.

  Accordingly, the present invention provides a shaft that passes through the crank chamber and is rotatably supported by the housing, a swash plate that rotates in synchronization with the rotation of the shaft, and a peripheral edge of the swash plate. In a variable capacity swash plate compressor, comprising a piston that reciprocates in a cylinder bore formed in the housing in accordance with rotation, wherein the stroke amount of the piston is variable by changing an inclination angle of the swash plate. The plate is provided with at least one asymmetric part.

  In the above invention, the swash plate has an opening to which a supporting member extending from the shaft is connected at a portion sandwiched between two sliding surfaces, and the opening peripheral wall thickness is the asymmetric portion. Is preferably asymmetric in the axial direction of the shaft. Furthermore, it is desirable that the central axis of the opening is shifted forward in the axial direction of the shaft.

  In the above invention, the swash plate has an opening to which a support member extending from the shaft is connected at a portion sandwiched between two sliding surfaces, and the opening peripheral edge is formed as the asymmetric portion. It is desirable that the thickness be asymmetric in a direction orthogonal to the axial direction of the shaft. The swash plate has a compression side and a suction side at a top dead center in a direction orthogonal to the axial direction of the shaft, and the asymmetric part has a small volume on the compression side and a large volume on the suction side. An opening is desirable. Furthermore, it is desirable to fit a reinforcing member on the compression side from the top dead center of the opening.

  The opening includes a hole for inserting a connecting member for connecting the support member and the swash plate, and it is preferable that the hole does not penetrate the swash plate on the compression side of the top dead center.

  The opening includes a hole for inserting a connecting member for connecting the support member and the swash plate, and the hole is preferably smaller on the compression side than the top dead center on the suction side.

  Further, the opening includes a hole for inserting a connecting member for connecting the support member and the swash plate, and a reinforcing member is preferably fitted into the hole on the compression side from the top dead center.

  Furthermore, it is preferable that the position of the support member is set corresponding to the shift amount of the central axis. The tilt angle of the support member and the hole position of the connection member that connects the support member and the swash plate may be set in accordance with the shift amount of the central axis.

  Further, it is desirable that the shift amount of the central axis is in the range of 0.2 mm to 1.0 mm when the thickness of the swash plate is 16 mm.

  Furthermore, it is preferable that a thrust flange that receives an axial load is provided on the shaft, and a balancer that compensates for the eccentric gravity center of the swash plate is provided on the thrust flange. Furthermore, it is desirable that the balancer is disposed in the vicinity of the outermost periphery of the top dead center of the thrust flange.

  According to the present invention, the thickness of the sliding surface of the swash plate is asymmetric in the axial direction or in the direction orthogonal to the axial direction, for example, the thickness of the portion requiring rigidity is increased. Since the rigidity of the portion can be ensured and the deformation of the sliding surface can be suppressed, the shoe can smoothly slide, and the swash plate can be prevented from being worn, speeded up, and prevented from noise. Further, it is more effective if the thickness of the sliding surface of the swash plate is asymmetric in both the axial direction and the direction orthogonal to the axial direction.

  The variable capacity swash plate compressor usually has a shaft 7 that passes through a crank chamber and is rotatably supported by a housing, a swash plate 8 that rotates in synchronization with the rotation of the shaft 7, and a peripheral edge of the swash plate 8. A piston that is moored and reciprocates in a cylinder bore formed in the housing as the swash plate 8 rotates. The piston moves in the cylinder bore by the swash plate 8 that rotates and swings as the shaft rotates. It reciprocates, sucks fluid, compresses and discharges, and its discharge capacity is adjusted by the angle of the swash plate.

  In the above variable capacity swash plate compressor, a relay member 24 is provided on the outer peripheral portion of the shaft 7 and is integrally formed with a support member 12 fixed to the shaft 7 and displacing the angle of the swash plate 8. The relay member 24 is fixed to the shaft 7 and driven by the key 21, and the rotation of the shaft 7 is transmitted to the relay member 24. Further, on the outer side of the relay member 24, a sleeve 15 is provided in which a drive member 16 that transmits the rotational force of the shaft 7 to the swash plate 8 is disposed. The sleeve 15 is urged by a spring 17 in a direction to reduce the inclination angle of the swash plate 8.

  As shown in FIGS. 1 and 2, the swash plate 8 is attached to the sleeve 15 via a driving member 16 and is connected to a support member 12 integral with a relay member 24 via a connecting member 14. Is done. Note that reference numeral 22 in FIG. 1 denotes a fixing tool for fixing the drive member 16 to the swash plate 8. Reference numeral 13 denotes a fixing tool for fixing the connecting member 14 to the swash plate 8. Further, 19 is a curved spring having a tilt characteristic stabilizing effect when the inclination angle is small, and 20 is a minimum inclination angle regulating means.

  Embodiment 1 according to the present invention is characterized in that, in the variable capacity swash plate compressor having the above-described configuration, the center axis C of the opening 80 of the swash plate 8 is shifted toward the front E side in the axial direction as shown in FIG. It is what. The axial front E side in this case refers to the flange 23 side, and the sliding on the opposite side of the two sliding surfaces of the swash plate to the side on which the axial force from the piston acts during the compression stroke. It is shifted in the direction of the surface. The amount of shift is desirably in the range of 0.2 mm to 1.0 mm when the thickness of the swash plate is 16 mm. In this case, if it is smaller than 0.2 mm, the shifted effect cannot be obtained, and if it is larger than 1.0 mm, the problem of insufficient rigidity on the shifted side occurs. Further, as a compensation for the shift amount, the position of the support member 12 is preferably set corresponding to the shift amount of the central axis C. Further, the inclination angle of the center axis of the support member 12 with respect to the shaft center axis and the hole position of the connection member 14 that connects the support member 12 and the swash plate 8 correspond to the shift amount of the center axis C. It is desirable to set.

  Moreover, since the wall thickness A on the axial rear side D is thicker than the wall thickness B on the axial front side E in the wall thickness of the opening 80 to which the connecting member is mounted, the force that presses the piston. Therefore, the rigidity at the so-called high load portion can be ensured, and deformation of the sliding surface can be suppressed.

  Example 2 according to the present invention is a variable capacity swash plate compressor configured as described above. As shown in FIG. 4, in an opening 80 into which the connecting member 14 is inserted, an opening from top dead center M to suction side F is provided. A part 82 of the opening 80 on the compression side G is made smaller from the top dead center M to a part 81 of the part 80. That is, in this embodiment, the peripheral wall thickness of the opening 80 is asymmetric in the direction orthogonal to the axial direction of the shaft 7. Thereby, since the thickness of the compression side G of the swash plate 8 can be ensured, the rigidity in the high load part mentioned above can be ensured, and deformation of the sliding surface can be suppressed.

  Embodiment 3 according to the present invention is a variable capacity swash plate compressor configured as described above. As shown in FIG. 5, in an opening 80 into which the connecting member 14 is inserted, an opening from the top dead center M to the suction side F is provided. The structure is characterized in that a part 81 of the portion 80 is structured so as not to penetrate the opening 80 on the compression side G from the top dead center M.

  In Example 4 according to the present invention, in the variable capacity swash plate compressor configured as described above, as shown in FIG. 6, the opening 80 from the top dead center M to the suction side F is opened in the opening 80 into which the connecting member 14 is inserted. A part 82 of the opening 80 is filled with another member on the compression side G from the top dead center M with respect to the part 81 of the part 80. The other member is preferably made of the same material as that of the swash plate or a material having the same or larger linear expansion coefficient as that of the swash plate.

  In the variable capacity swash plate compressor having the above-described configuration, the fifth embodiment according to the present invention, as shown in FIG. It is characterized in that it is provided on the thrust flange 23. By arranging the balancer 24 in the vicinity of the outermost periphery on the top dead center side of the thrust flange 23, the oil can be efficiently stirred and directed to the swash plate 8 side to supply the oil to the sliding surface of the swash plate. Is.

  With the variable capacity swash plate compressor having the configuration according to each of the above embodiments, the sliding of the shoe becomes smooth, so that the swash plate 8 can be prevented from being worn, speeded up and prevented from noise. In addition, in this application, although the support member 12 becomes a structure which transmits the driving force from the shaft 7 to the swash plate 8, the effect by this application is exhibited similarly even if it is a structure which does not transmit a driving force.

1 is an exploded bird's-eye view of a variable capacity swash plate compressor according to the present invention. It is sectional drawing of a swash plate at the time of a swash plate angle 0 degree. It is a side view of the swash plate which concerns on Example 1 of this invention. It is sectional drawing of the swash plate which concerns on Example 2 of this invention. It is sectional drawing of the swash plate which concerns on Example 3 of this invention. It is sectional drawing of the swash plate which concerns on Example 4 of this invention.

Explanation of symbols

7 Shaft 8 Swash plate 12 Support member 14 Connection member 15 Sleeve 16 Drive member 17 Spring 21 Key 22 Fastener 23 Thrust flange 24 Relay member 80 Opening

Claims (14)

A shaft that passes through the crank chamber and is rotatably supported by the housing, a swash plate that rotates in synchronization with the rotation of the shaft, and a mooring to the periphery of the swash plate. A variable capacity swash plate compressor that includes a piston that reciprocates in the formed cylinder bore and changes the stroke amount of the piston by changing the inclination angle of the swash plate;
The variable capacity swash plate compressor, wherein the swash plate has at least one asymmetric part.   The swash plate has an opening to which a support member extending from the shaft is coupled at a portion sandwiched between two sliding surfaces, and the thickness of the periphery of the opening is defined as the asymmetric portion of the shaft. 2. The variable capacity swash plate compressor according to claim 1, wherein the compressor is asymmetric in the axial direction.   The variable capacity swash plate compressor according to claim 2, wherein a central axis of the opening is shifted forward in an axial direction of the shaft.   The swash plate has an opening to which a support member extending from the shaft is coupled at a portion sandwiched between two sliding surfaces, and the thickness of the periphery of the opening is defined as the asymmetric portion of the shaft. 2. The variable capacity swash plate compressor according to claim 1, wherein the compressor is asymmetric in a direction orthogonal to the axial direction.   The swash plate has a compression side and a suction side with a top dead center as a boundary in a direction orthogonal to the axial direction of the shaft, and the asymmetric part is an opening having a small volume on the compression side and a large volume on the suction side The variable capacity swash plate compressor according to claim 4, wherein   6. The variable capacity swash plate compressor according to claim 5, wherein a reinforcing member is fitted on the compression side from the top dead center of the opening.   5. The opening includes a hole for inserting a connecting member for connecting the support member and the swash plate, and the hole does not penetrate the swash plate on the compression side of the top dead center. The variable capacity swash plate compressor described.     The opening includes a hole for inserting a connecting member for connecting a support member and a swash plate, and the hole is smaller on the compression side than the top dead center on the suction side. 4. The variable capacity swash plate compressor according to 4.   The opening includes a hole for inserting a connecting member for connecting the support member and the swash plate, and a reinforcing member is fitted into the hole on the compression side from the top dead center. The variable capacity swash plate compressor according to claim 8.   4. The variable capacity swash plate compressor according to claim 3, wherein the position of the support member is set corresponding to a shift amount of the central axis.   11. The tilt angle of the support member and the hole position of the connection member that connects the support member and the swash plate are set according to the shift amount of the central axis. Variable capacity swash plate compressor.   The variable displacement swash plate compressor according to claim 3, 10 or 11, wherein the shift amount of the central axis is within a range of 0.2 mm to 1.0 mm. 13. The thrust shaft according to claim 1, wherein a thrust flange that receives an axial load is provided on the shaft, and a balancer that compensates for the eccentric gravity center of the swash plate is provided on the thrust flange. The variable capacity swash plate compressor described.   The variable capacity swash plate compressor according to claim 13, wherein the balancer is disposed in the vicinity of the outermost periphery of the top dead center of the thrust flange.

Images