Swash plate type variable displacement compressor

A swash plate type variable displacement compressor comprising:

• a housing in which a suction chamber, a discharge chamber, a swash plate chamber, and a cylinder bore are formed;
• a drive shaft rotationally supported by the housing;
• a swash plate rotatable in the swash plate chamber by rotation of the drive shaft;
• a link mechanism arranged between the drive shaft and the swash plate, the link mechanism allowing change of an inclination angle of the swash plate with respect to a line perpendicular to the rotation axis of the drive shaft;
• a piston reciprocally received in the cylinder bore;
• a conversion mechanism that causes the piston to reciprocate in the cylinder bore by a stroke corresponding to the inclination angle of the swash plate through rotation of the swash plate;
• an actuator capable of changing the inclination angle of the swash plate;
• and
• a control mechanism that controls the actuator,
• wherein
• the actuator is arranged in the swash plate chamber and rotates integrally with the drive shaft,
• the actuator includes a rotation body fixed to the drive shaft, a movable body that is connected to the swash plate and movable relative to the rotation body in the direction of the rotation axis of the drive shaft, and a control pressure chamber that is defined by the rotation body and the movable body and moves the movable body using pressure in the control pressure chamber,
• wherein the rotation body is slidably located within the movable body and the movable body is configured to move along the rotation axis of the drive shaft,
• one of the suction chamber and the swash plate chamber is a low pressure chamber,
• the control mechanism has a control passage through which the control pressure chamber communicates with the low pressure chamber and the discharge chamber and a control valve capable of adjusting the opening degree of the control passage,
• at least a section of the control passage is formed in the drive shaft, and
• the movable body is arranged such that the inclination angle of the swash plate is increased through a rise of the pressure in the control pressure chamber.