Patent ID: 6231314
Filing Date: 2001-05-15
Classification: F04B

Abstract:
A variable displacement compressor comprising:a cylinder block having a center axis thereof and provided with a plurality bores around the center axis;a drive shaft inserted into a shaft hole of said cylinder block and supported by said cylinder block to be rotatable;a swash plate provided inside a crank chamber adjacent to said cylinder block and supported by said drive shaft to be able to change an angle of inclination thereof with respect to a plane vertical to the center axis of said drive shaft and to rotate together with said drive shaft;pistons coupled with said swash plate and reciprocating inside said bores;a housing closing off an end face of the cylinder block and having a suction chamber and a discharge chamber;a gas extracting passage providing fluid communication between said crank chamber and said suction chamber;a gas feed passage providing fluid communication between said crank chamber and said discharge chamber;a displacement control valve arranged on said gas feed passage and for adjustably changing the angle of inclination of said swash plate based on an adjustable change in the crank chamber pressure to thereby control a displacement of said compressor; anda valve element arranged in said gas extracting passage and operated in association with the rotation of said drive shaft so that said gas extracting passage can be opened intermittently by said valve element during the rotation of said drive shaft.