Patent ID: 6213728
Filing Date: 2001-04-10
Classification: F04B

Abstract:
A variable displacement compressor comprising:a housing including a cylinder bore, a crank chamber, a suction chamber, and a discharge chamber;a piston accommodated in the cylinder bore;a drive shaft rotatably supported in the housing;a drive plate coupled to the piston for converting rotation of the drive shaft to reciprocation of the piston, the drive plate being tiltably supported on the drive shaft, wherein the drive plate moves between a maximum inclination position and a minimum inclination position in accordance with the pressure in the crank chamber, wherein the inclination of the drive plate determines the piston stroke and the displacement of the compressor;a pressure control mechanism for controlling the pressure in the crank chamber to change the inclination of the drive plate;a control passage for connecting the crank chamber to a selected chamber in the compressor;a pressure adjusting valve located in the control passage, wherein the pressure adjusting valve regulates gas flow in the control passage; anda controller for controlling the pressure adjusting valve to limit the pressure in the crank chamber to prevent the pressure in the crank chamber from becoming undesirably high.