Variable Displacement Compressor

Abstract

Variable displacement compressor comprising a housing; piston; and drive shaft rotatably supported by the housing; a rotor rotating in unison with the drive shaft; a swash plate that rotates in synchronism with the rotation of the connected rotor. Rotation of the swash plate is converted into a reciprocating motion of the piston; and a pressure control valve that is capable of controlling the internal pressure of a crank chamber. The swash plate is connected to the rotor in an inclined fashion such that, as viewed from a site on the swash plate corresponding to the top dead center position of the piston, a compression process region toward the positive direction of the rotation of the swash plate is farther away from the bearing surface of a thrust bearing, which is formed on the rotor, than a suction process region toward the negative direction of the rotation of the swash plate.

1 . A variable displacement compressor comprising a housing accommodating a discharge chamber; a suction chamber; a crank chamber and a cylinder bore, a piston provided in the cylinder bore, a drive shaft rotatably supported by the housing, a rotor that rotates integrally with the drive shaft, a swash plate that rotates in synchronism with a rotation of the rotor connected through a connecting means, a conversion mechanism that converts a rotation of the swash plate into a reciprocating motion of the piston, and a pressure control valve that is capable of controlling an internal pressure of the crank chamber according to a valve opening, wherein
 when the valve opening is changed to change the internal pressure of the crank chamber, a discharge capacity for compressing and discharging a refrigerant sucked from the suction chamber into the cylinder bore is changed by changing a stroke of the piston through changing an inclination of the swash plate to the drive shaft while the swash plate slides on the drive shaft, characterized in that   the swash plate is connected as inclined from the rotor so that a compression process region at a side of a positive rotation direction of the swash plate is located away from a backup face of a thrust bearing formed on the rotor further than a suction process region at a side of a negative rotation direction of the swash plate, as viewed from a position corresponding to a top dead center position of the piston.   
     
     
         2 . The variable displacement compressor according to  claim 1 , wherein a ratio of a distance of the compression process region of the swash plate from the backup face of the thrust bearing to another distance of the suction process region from the backup face is maximum as viewed from the position corresponding to the top dead center position when the inclination is maximum. 
     
     
         3 . The variable displacement compressor according to  claim 1 , wherein a minimum inclination angle of the swash plate is set to almost 0° and a ratio of a distance of the compression process region of the swash plate from the backup face of the thrust bearing to another distance of the suction process region from the backup face is minimum as viewed from the position corresponding to the top dead center position when the inclination is minimum.