Swash plate type variable displacement compressor

A swash plate type variable displacement compressor comprising:

• a housing having therein a suction chamber, a discharge chamber, a swash plate chamber, and a plurality of cylinder bores;
• a drive shaft rotatably supported in the housing;
• a swash plate which is rotatable in the swash plate chamber with the rotation of the drive shaft;
• a link mechanism which is disposed between the drive shaft and the swash plate and allows a change in an inclination angle of the swash plate with respect to the direction perpendicular to the axis of the drive shaft;
• a plurality of pistons which is reciprocally received in the respective cylinder bores;
• a conversion mechanism which converts the rotation of the drive shaft into reciprocal movement of the pistons in the respective cylinder bores in conjunction with the swash plate with a stroke length according to the inclination angle of the swash plate;
• an actuator for changing the inclination angle of the swash plate;
• and
• a control mechanism which controls the actuator, wherein
• the housing has therein a pressure regulation chamber, the pressure regulation chamber is disposed radially inward of the discharge chamber, which is disposed radially inward of the suction chamber,
• the actuator includes a fixed body, a movable body, and a pressure control chamber, wherein the fixed body is fixed on the drive shaft in the swash plate chamber, the movable body is connected to the swash plate and movable relative to the fixed body in the direction of the axis of rotation, and the pressure control chamber is defined by the fixed body and the movable body and the pressure in the pressure control chamber is changed by introducing the pressure in the discharge chamber into the pressure control chamber such that the movable body is moved,
• the control mechanism has a control passage and a control valve, the control passage providing communication between the discharge chamber and the pressure control chamber via the pressure regulation chamber, the control valve adjusting an opening of the control passage to vary pressure in the pressure regulation chamber such that the movable body is moved,
• at least a part of the control passage is formed in the drive shaft, and the drive shaft projects into the pressure regulation chamber such that the control passage connects the pressure regulation chamber and the pressure control chamber.