Variable displacement swash plate type compressor

A variable displacement swash plate type compressor comprising:

• a drive shaft;
• a housing that rotatably supports the drive shaft, the housing including a first cylinder bore formed at one end side of the drive shaft, a second cylinder bore formed at an opposite end side of the drive shaft, and a swash plate chamber formed between the first cylinder bore and the second cylinder bore;
• a swash plate that is rotatable in the swash plate chamber by rotation of the drive shaft;
• a link mechanism that is provided between the drive shaft and the swash plate and permits change of an inclination angle of the swash plate in a direction perpendicular to an axis of the drive shaft;
• a double-headed piston that defines a first compression chamber in the first cylinder bore and defines a second compression chamber in the second cylinder bore;
• a conversion mechanism that reciprocates the piston in the first and second cylinder bores at a stroke corresponding to the inclination angle along with the rotation of the swash plate;
• an actuator capable of changing the inclination angle;
• and
• a control mechanism that controls the actuator,
• wherein the second cylinder bore has a smaller diameter than the first cylinder bore,
• a first thrust bearing is provided between the one end side of the drive shaft and the housing so as to receive a thrust force acting on the drive shaft in a direction toward the one end side,
• a second thrust bearing is provided between the opposite end side of the drive shaft and the housing so as to receive a thrust force acting on the drive shaft in a direction toward the opposite end side, and
• a second spring constant of the second thrust bearing is greater than a first spring constant of the first thrust bearing.