Variable Displacement Compressor

Abstract

This variable displacement compressor comprises: a housing; a piston; a drive shaft rotatably supported by the housing; a rotor that rotates in unison with the drive shaft; a swash plate that rotates in synchronism with the rotation of the rotor connected via a connecting means; a conversion mechanism that converts the rotation of the swash plate 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 variable displacement compressor is characterized in that: the connecting means directly or indirectly connects a first arm projecting from the rotor and a second arm projecting from the swash plate; and the drive shaft is eccentrically inserted into a through-hole that is perforated through the swash plate. With this configuration, it is possible to provide a variable displacement compressor in which the behavior of the swash plate can be stabilized with a simple structure and in which the swash plate can be inclined smoothly.

1 . A variable displacement compressor comprising a housing having compartments of 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 to rotate integrally with the drive shaft, a swash plate to rotate in synchronism with 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 connecting means directly or indirectly connects a first arm projecting from the rotor and a second arm projecting from the swash plate,   the drive shaft being eccentrically inserted into a through-hole that is perforated through the swash plate.   
     
     
         2 . The variable displacement compressor according to  claim 1 , wherein the drive shaft is inserted eccentrically toward a positive rotation direction of the swash plate as viewed from a position corresponding to a top dead center position. 
     
     
         3 . The variable displacement compressor according to  claim 2 , wherein the swash plate contacts the drive shaft in a compression process region at a side of the positive rotation direction from the position corresponding to the top dead center position while a gap is maintained between the swash plate and the drive shaft in a suction process region at another side of a negative rotation direction from the position corresponding to the top dead center position when the swash plate changes the inclination within a range of movement allowed by a gap between a connecting element which connects the first arm and the second arm and the first arm and another gap between the connecting element and the second arm.