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, and a link mechanism and a plurality of pistons. The compressor further includes a partitioning body, a movable body, a control chamber, a control mechanism and a connecting mechanism. The connecting mechanism includes first and second arms, a traction portion, and a link pin. The first and second arms have first and second guide surfaces that are placed in contact with the link pin. The link pin is held by the traction portion so as to be rollable on the first and second guide surfaces, respectively. A restrictor is provided on the ling pin or in the first and second arms so as to prevent the link pin from moving in a direction of an axis thereof.

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 connecting the drive shaft and the swash plate and permitting changing of an inclination angle of the swash plate with respect to a direction perpendicular to an axis of rotation of the drive shaft;   a plurality of pistons received in the respective cylinder bores so as to form respective compression chambers and reciprocally movable with the rotation of the swash plate for a length of stroke determined by the inclination angle of the swash plate;   a partitioning body mounted on the drive shaft for rotation therewith in the swash plate chamber;   a movable body that is mounted on the drive shaft for rotation therewith and movable relative to the partitioning body along the axis of rotation in the swash plate chamber to thereby change the inclination angle of the swash plate;   a control chamber that is formed between the partitioning body and the movable body and causes the movable body to move with a pressure in the control chamber;   a control mechanism controlling the pressure in the control chamber; and   a connecting mechanism connecting the swash plate and the movable body so that the movable body pulls the swash plate to increase the inclination angle with an increase of the pressure in the control chamber,   wherein the swash plate has a top dead center portion that permits one of the pistons to be located at the top dead center,   wherein a plane that passes through the top dead center portion and the axis of rotation is defined as an imaginary plane,   wherein the connecting mechanism includes a first arm that extends from the movable body toward the swash plate and is disposed on one side of the imaginary plane, a second arm that extends from the movable body toward the swash plate and disposed on the other side of the imaginary plane, and a traction portion that is projected from the swash plate toward the movable body between the first arm and the second arm, and a link pin that connects the first arm and the second arm of the movable body and the traction portion,   wherein the first arm has a first guide surface facing away from the swash plate and the second arm has a second guide surface facing away from the swash plate,   wherein the first guide surface and the second guide surface are placed in contact with the link pin,   wherein the link pin is held by the traction portion so as to be rollable on the first guide surface and the second guide surface, and   wherein a restrictor is provided on the link pin or in the first and second arms so as to prevent the link pin from moving in a direction of an axis thereof.   
     
     
         2 . The variable displacement type swash plate compressor according to  claim 1 , wherein the first arm includes a first facing portion that faces one end surface of the link pin and the second arm includes a second facing portion that faces the other end surface of the link pin, and wherein the first facing portion and the second facing portion cooperate to form the restrictor. 
     
     
         3 . The variable displacement type swash plate according to  claim 2 , wherein peripheries of the end surfaces of the link pin are chamfered. 
     
     
         4 . The variable displacement type swash plate according to  claim 1 , wherein the traction portion has a support hole in which the link pin is rotatably supported, wherein the support hole has a diameter that is increased axially outward from the middle toward the opposite ends of the support hole.