Variable displacement type swash plate compressor

Abstract

A variable displacement type swash plate compressor includes a housing having therein a swash plate chamber and a plurality of cylinder bores, a drive shaft, a swash plate, a link mechanism, and a plurality of the pistons. The compressor further includes a partition member, a movable member, and a control pressure chamber, and a control mechanism. First and second seal members are disposed between the partition member and the movable member and between the drive shaft and the movable member, respectively, and are elastically deformed to provide sealing between the control pressure chamber and the swash plate chamber. At least one of a clearance formed between the partition member and the movable member and a clearance formed between the drive shaft and the movable member when the swash plate is at its minimum inclination angle is greater than when the swash plate at a maximum inclination angle position.

What is claimed is: 
     
         1 . A variable displacement type swash plate compressor comprising:
 a housing having therein a swash plate chamber and a plurality of cylinder bores;   a drive shaft rotatably supported in the housing;   a swash plate mounted on the drive shaft for rotation therewith in the swash plate chamber;   a link mechanism permitting changing of an inclination angle of the swash plate with respect to the an imaginary plane extending perpendicular to a direction of an axis of the drive shaft;   a plurality of pistons received in the respective cylinder bores and connected to the swash plate, the pistons being reciprocally movable with the rotation of the drive shaft with a stroke length that is determined by the inclination angle of the swash plate;   a partition member mounted on the drive shaft for rotation therewith in the swash plate chamber;   a movable member mounted on the drive shaft for rotation therewith in the swash plate chamber, the movable member being movable in the direction of the axis along the drive shaft and the partition member to change the inclination angle;   a control pressure chamber formed between the partition member and the movable member, the control pressure chamber moving the movable member in a direction that increases the inclination angle with an increase of a pressure in the control pressure chamber; and   a control mechanism controlling the pressure in the control pressure chamber;   wherein a first seal member is disoposed between the partition member and the movable member, and the first seal member is elastically deformed to provide sealing between the control pressure chamber and the swash plate chamber,   wherein a second seal member is disposed the drive shaft and the movable member, and the second seal member is elastically deformed to provide sealing between the control pressure chamber and the swash plate chamber, and   wherein a clearance formed between the partition member and the movable member when the swash plate is at a minimum inclination angle is greater than the clearance formed between the partition member and the movable member when the swash plate is at a maximum inclination angle and/or a clearance formed between the drive shaft and the movable member when the swash plate is at the minimum inclination angle is greater than the clearance formed between the drive shaft and the movable member when the swash plate is at the maximum inclination angle.   
     
     
         2 . The variable displacement type swash plate compressor according to  claim 1 , wherein only the clearance formed between the partition member and the movable member when the swash plate is at the minimum inclination angle is greater than the clearance formed between the partition member and the movable member when the swash plate is at the maximum inclination angle.