Variable capacity swash plate compressor

A variable capacity swash plate compressor, including:

• a housing having therein a crank room, a suction plenum communicating with a suction bore of the compressor, and a discharge gas plenum,
• a drive shaft rotatably supported in said housing,
• a plurality of cylinders disposed in parallel with the axis of said drive shaft and spaced apart along the circumference of said drive shaft,
• a plurality of pistons respectively received in said plurality of cylinders for reciprocating movement therein,
• a plurality of rows connected to said plurality of pistons, respectively;
• a piston support for supporting said plurality of rods;
• a control valve disposed in said suction bore with the upstream side thereof communicating with said crank room and with the downstream side thereof communicating with said suction plenum,
• a swash plate attached to said drive shaft for rotation about the axis normal to the axis of said drive shaft, the nutational angle of said swash plate being controlled by a pressure difference upstream and downstream of said control valve, and the nutational motion of said swash plate causing reciprocating motions of said pistons with strokes corresponding to said nutational angle of said swash plate, and
• a pivot pin for rotatably supporting said swash plate on said drive shaft,
• said swash plate comprising a mass distribution so determined that, when said pistons and said rods are reciprocatingly moved and said piston support is wobbly moved, the sum of a first nutational moment and a second nutational moment is varied in magnitude and/or direction in accordance with variations in the nutational angle of said swash plate, said first nutational moment being a moment acting upon said swash plate about the axis of said pivot pin produced by the inertial forces of said pistons, rods and piston support along the axis of said drive shaft and said second nutuational moment being a moment about the axis of said pivot pin produced by the rotation of said swash plate per se having said mass distribution.