Capacity-variable type swash plate compressor

Abstract

A capacity-variable type swash plate compressor in which the preferable operability of a link mechanism and reduction of manufacturing cost are realized is provided. According to the compressor in the present invention, a link mechanism includes one swash plate arm and intermediate arms. The intermediate arms include first and second intermediate arms. The first and second intermediate arms are joined while being rotatably supported by a lug member and the swash plate arm via a lug-side pin which constitutes a lug-side axis and a swash-plate-side pin which constitutes a swash-plate-side axis and clamping the lug member and the swash plate arm via the lug-side pin and the swash-plate-side pin so as to allow a sliding movement.

1 . A capacity-variable type swash plate compressor comprising:
 a housing having a cylinder bore;   a drive shaft rotatably supported by the housing;   a lug member which rotates synchronously with the drive shaft in the housing;   a swash plate supported by the drive shaft so as to change in angle of inclination in the housing;   a link mechanism provided between the lug member and the swash plate in the housing so as to allow the swash plate to change in the angle of inclination with respect to the drive shaft and prohibit the swash plate from rotating with respect to the drive shaft;   a piston stored in the cylinder bore so as to be capable of a reciprocal movement; and   a movement converting mechanism provided between the swash plate and the piston for converting the rocking movement of the swash plate into the reciprocal movement of the piston,   wherein the link mechanism includes one swash plate arm projecting from the swash plate toward the lug member, and intermediate arms rotatably supported by the lug member so as to rotate about the lug-side axis extending orthogonally to a virtual plane defined by the center axis of the drive shaft and the top dead center position of the swash plate and rotatably supported by the swash plate arm about the swash-plate-side axis which extends in parallel to the lug-side axis,   wherein the intermediate arms include a first intermediate arm and a second intermediate arm extending from the lug member side toward the swash plate side, and   wherein the first intermediate arm and the second intermediate arm are joined while being rotatably supported by the lug member and the swash plate arm via a lug-side pin which constitutes the lug-side axis and a swash-plate-side pin which constitutes the swash-plate-side axis and clamping the lug member and the swash plate arm via the lug-side pin and the swash-plate-side pin so as to allow the sliding movement.   
   
   
       2 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein the lug-side pin is loosely fitted to the lug member and is press-fitted into the first intermediate arm and the second intermediate arm, and the swash-plate-side pin is loosely fitted to the swash plate arm and is press-fitted into the first intermediate arm and the second intermediate arm.   
   
   
       3 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein the swash-plate-side axis is positioned on the side of the top dead center position of the swash plate, and the lug-side axis is closer to the drive shaft than the swash-plate-side axis.   
   
   
       4 . The capacity-variable type swash plate compressor according to  claim 3 ,
 wherein the lug-side axis is positioned on the side of the bottom dead center position of the swash plate.   
   
   
       5 . The capacity-variable type swash plate compressor according to  claim 3 ,
 wherein a thrust plate which rotates synchronously with the drive shaft, and a thrust bearing provided between the thrust plate and the housing are provided in the housing, and   wherein the thrust plate and the lug member both constitute an integral lug plate.   
   
   
       6 . The capacity-variable type swash plate compressor according to  claim 5 ,
 wherein the lug plate is provided with a supporting portion which supports the side opposite from the swash plate of at least one of the first intermediate arm and the second intermediate arm when the swash plate is inclined to a maximum angle of inclination, and   wherein the supporting portion is positioned on the side of the top dead center position of the swash plate.   
   
   
       7 . The capacity-variable type swash plate compressor according to  claim 3 ,
 wherein the thrust-plate which rotates synchronously with the drive shaft, and the thrust bearing provided between the thrust plate and the housing are provided in the housing, and the thrust plate is in abutment with the lug member or the intermediate arms.   
   
   
       8 . The capacity-variable type swash plate compressor according to  claim 7 ,
 wherein the thrust plate is clearance-fitted to the drive shaft.   
   
   
       9 . The capacity-variable type swash plate compressor according to  claim 7 ,
 wherein the thrust plate is formed of vibration-control metal alloy.   
   
   
       10 . The capacity-variable type swash plate compressor according to any one of  claims 7 ,
 wherein the lug member is provided with a supporting portion for supporting the side opposite from the swash plate of at least one of the first intermediate arm and the second intermediate arm when the swash plate is inclined to a maximum angle of inclination, and the supporting portion is positioned on the side of the top dead center position of the swash plate.   
   
   
       11 . The capacity-variable type swash plate compressor according to  claim 8 ,
 wherein the thrust plate is formed with side walls having guiding surfaces for guiding the outer surface of the first intermediate arm and the outer surface of the second intermediate arm.   
   
   
       12 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein the intermediate arms are formed with a weight portion on the side of the bottom dead center position of the swash plate.   
   
   
       13 . The capacity-variable type swash plate compressor according to  claim 5 ,
 wherein a spring having an urging force for urging the swash plate in the direction to reduce the angle of inclination of the swash plate is provided between the lug member and the intermediate arms, between the thrust plate and the intermediate arms, or between the intermediate arms and the swash plate arm.   
   
   
       14 . The capacity-variable type swash plate compressor according to  claim 7 ,
 wherein a spring having an urging force for urging the swash plate in the direction to reduce the angle of inclination of the swash plate is provided between the lug member and the intermediate arms, between the thrust plate and the intermediate arms, or between the intermediate arms and the swash plate arm.   
   
   
       15 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein a run-off for avoiding distortion caused by the first intermediate arm and the second intermediate arm is formed on at least one of the lug member and the swash plate arm.   
   
   
       16 . The capacity-variable type swash plate compressor according to  claim 2 ,
 wherein the gap between the lug member and the lug-side pin is smaller than the gap between the first and second intermediate arms and the lug member.   
   
   
       17 . The capacity-variable type swash plate compressor according to  claim 2 ,
 wherein the gap between the swash plate arm and the swash-plate-side pin is smaller than the gap between the first and second intermediate arms and the swash plate arm.   
   
   
       18 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein one of the lug-side pin and the swash-plate-side pin is integrated with the first intermediate arm, and the other one of the lug-side pin and the swash-plate-side pin is integrated with the second intermediate arm.   
   
   
       19 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein the lug-side pin and the swash-plate-side pin and one of the first intermediate arm and the second intermediate arm is integrated.   
   
   
       20 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein at least one of the group of the drive shaft, the lug member and the lug-side pin, and the group of the swash plate, the swash plate arm and the swash-plate-side pin are integrated.   
   
   
       21 . The capacity-variable type swash plate compressor according to  claim 7 ,
 wherein a washer is provided between the lug member and the thrust plate.   
   
   
       22 . The capacity-variable type swash plate compressor according to  claim 1 ,
 wherein the lug-side pin is loosely fitted to the first intermediate arm and the second intermediate arm while being press-fitted into the lug member, the swash-plate-side pin is loosely fitted to the first intermediate arm and the second intermediate arm while being press-fitted into the swash plate arm, and   wherein the first intermediate arm and the second intermediate arm are prevented from coming apart from the lug-side pin and the swash-plate-side pin.   
   
   
       23 . The capacity-variable type swash plate compressor according to  claim 22 ,
 wherein the thrust plate which rotates synchronously with the drive shaft, and the thrust bearing provided between the thrust plate and the housing are provided in the housing, and   wherein at least one of the thrust plate and the swash plate is formed with the side walls having the guiding surfaces for guiding the outer surface of the first intermediate arm and the outer surface of the second intermediate arm.   
   
   
       24 . The capacity-variable type swash plate compressor according to  claim 22 ,
 wherein the first and second intermediate arms are such that the thickness around one of the lug-side pin and the swash-plate-side pin is larger than the thickness around the other one of those in the direction of rotation of the drive shaft.   
   
   
       25 . The capacity-variable type swash plate compressor according to  claim 2 ,
 wherein a bearing is provided at least one of between the lug member and the lug-side pin and between the swash plate arm and the swash-plate-side pin.   
   
   
       26 . The capacity-variable type swash plate compressor according to any one of  claims 1 ,
 wherein the movement converting mechanism includes shoe sliding surfaces formed on front and rear outer peripheral surfaces of the swash plate, shoe receiving surfaces formed on the piston, and semispherical shoes provided between the shoe sliding surfaces and the shoe receiving surfaces, and   wherein the swash plate arm is formed so as to avoid a position vertically above the shoe sliding surface.