Variable displacement swash plate compressor

A variable displacement swash plate compressor comprising:

• a housing including a suction chamber, a discharge chamber, a swash plate chamber, and a plurality of cylinder bores;
• a drive shaft rotationally supported by the housing;
• a swash plate that is rotatable together with the drive shaft in the swash plate chamber;
• a link mechanism arranged between the drive shaft and the swash plate, wherein the link mechanism allows for changes in an inclination angle of the swash plate relative to a direction orthogonal to a rotation axis of the drive shaft;
• a plurality of pistons reciprocally accommodated in the cylinder bores respectively;
• a conversion mechanism that reciprocates each piston in the cylinder bore with a stroke that is in accordance with the inclination angle of the swash plate when the swash plate rotates;
• an actuator capable of changing the inclination angle of the swash plate;
• and
• a control mechanism that controls the actuator;
• wherein the actuator is adapted to be rotatable integrally with the drive shaft;
• the actuator includes a partitioning body, which is loosely fitted to the drive shaft in the swash plate chamber, a movable body, which is coupled to the swash plate and movable relative to the partitioning body along the rotation axis, and a control pressure chamber, which is defined by the partitioning body and the movable body and moves the movable body by pressure of the control pressure chamber;
• at least one of the suction chamber and the swash plate chamber defines a low pressure chamber;
• the control mechanism includes
• a control passage that connects the control pressure chamber, the low pressure chamber, and the discharge chamber, and
• a control valve capable of adjusting an open degree of the control passage;
• the control passage is at least partially formed in the drive shaft;
• and
• the movable body is adapted to increase the inclination angle when the pressure of the control pressure chamber increases.