Patent ID: 6024008
Filing Date: 2000-02-15
Classification: F04B,F05B

Abstract:
A variable displacement type compressor having a piston accommodated in a cylinder bore, a cam plate accommodated in a crank chamber for reciprocating the piston and a drive shaft for tiltably and rotatably supporting the cam plate, wherein the compressor performs suction of a gas from a suction chamber, compression of the gas in the cylinder bore and discharging of the gas to a discharge chamber in accordance with a reciprocation of the piston, and wherein the compressor changes a discharge amount of the gas by changing the inclination angle of the cam plate based on pressure differences between the pressure in the crank chamber and the pressure in the cylinder bore, the compressor comprising:a passage for introducing the gas to the suction chamber;a spool movably supported on the drive shaft for selectively opening and closing the passage;a spring for urging the spool toward the bearing in a direction where the spool opens the passage; anda thrust bearing located about the drive shaft for receiving a load from the cam plate, wherein the thrust bearing moves together with the spool;wherein the cam plate includes:a projection that extends toward the thrust bearing, wherein the projection has an abutment surface that contacts the thrust bearing;a shaft hole within which the drive shaft is located, the shaft hole having an opening that opens adjacent to the projection; anda recess formed in the wall of the shaft hole adjacent to the opening;wherein a hardening treatment is performed on the wall of the shaft hole and on the outer surface of the projection to improve wear resistance.