Patent ID: 6179572
Filing Date: 2001-01-30
Classification: F04B

Abstract:
A variable displacement compressor comprising a tilting plate disposed around a rotary shaft disposed in a crank chamber and carrying out a tilting movement, pistons which carry out a reciprocating movement in cylinder bores due to said tilting movement of said tilting plate, suck a fluid to be compressed from a suction chamber and compress said fluid and feed said fluid to a discharge chamber, and a displacement control valve mechanism for controlling the stroke of said pistons by varying the inclination angle of said tilting plate with an adjustment of pressure in said crank chamber;said displacement control valve mechanism comprising a valve chamber communicated with said discharge chamber, pressure sensing means which senses the pressure fluctuation of either one of said suction chamber or said crank chamber and carries out an extending or retracting movement, and a valve body disposed in said valve chamber and is opened or closed in response to said extending or retracting movement and adjusts a valve travel of a first passage from said discharge chamber to said crank chamber,said displacement control valve mechanism further including a pressure chamber which is defined as a neighboring chamber of said valve chamber, a second passage which makes said pressure chamber and said crank chamber communicate with each other, and a valve guide portion which defines said pressure chamber and supports said valve body while allowing an insertion of said valve body therein,said valve body having one end disposed in said pressure chamber and the other end opposite to said one end, said one end having a pressure receiving area, said other end having a sealing cross-sectional area, said pressure receiving and said sealing cross-sectional areas being determined such that they satisfy the variously required suction pressure-discharge pressure characteristics of said displacement control valve mechanism.