Variable Capacity Compressor

A variable capacity compressor which variably controls a discharge capacity of refrigerant by connecting a rotor fixed to a drive shaft rotatably supported within a housing to a swash plate slidably attached to the drive shaft so that an inclination angle relative to an axis line of the drive shaft is variable via a link arm with both ends rotatably connected to the rotor and the swash plate, allowing tilting of the swash plate while causing the swash plate to rotate synchronously with the rotor, converting the rotation of the swash plate to reciprocating motion parallel to the drive shaft of a piston inserted into a cylinder bore to draw and discharge the refrigerant, and controlling the inclination angle of the swash plate to control a stroke amount of the piston, wherein:

• a shape, weight, and center of gravity of the swash plate, or those of the swash plate and a connected body integral therewith, are set so that a moment of rotational motion caused by the swash plate, or the swash plate and the connected body integral therewith, when the drive shaft rotates in the position of a minimum inclination angle θmin of the swash plate acts in an inclination angle decreasing direction of the swash plate;
• a shape, weight, and center of gravity of the link arm, or those of the link arm and a connected body integral therewith, are set so that a total moment of rotational motion caused by the link arm, the swash plate, and the connected body integral therewith acts in an inclination angle increasing direction of the swash plate;
• and
• the moment of rotational motion acting in the inclination angle increasing direction of the swash plate by setting the shape, weight, and center of gravity of the link arm, or those of the link arm and the connected body integral therewith, is determined by calculating a sum of moment components about the center of gravity and moment components caused by a centrifugal force acting on the center of gravity.