Patent ID: 7021901

Claim:
A variable displacement compressor including a wobble body that is arranged in a crank chamber formed gastight, such that an inclination angle of the wobble body can be changed with respect to a rotating shaft, and is driven by rotation of the rotating shaft, for wobbling motion, and pistons connected to the wobble body, for performing reciprocating motion in a direction along axis in accordance with the wobbling motion of the wobble body, to thereby suck refrigerant from a suction chamber into a cylinder, compress the refrigerant, and deliver the compressed refrigerant from the cylinder to a discharge chamber, the variable displacement compressor comprising: a variable orifice arranged in a suction-side refrigerant passage leading to the suction chamber or a discharge-side refrigerant passage leading to the discharge chamber, such that an openness thereof can be set according to changes in external conditions; a differential pressure regulating valve arranged at a desired location in at least one of a first refrigerant passage leading from the discharge chamber to the crank chamber, and a second refrigerant passage leading from the crank chamber to the suction chamber, for sensing a differential pressure generated across the variable orifice and adjusting an openness thereof such that the differential pressure becomes equal to a predetermined value; and a fixed orifice arranged at a desired location in the first refrigerant passage and the second refrigerant passage, wherein a flow rate of refrigerant flowing into the suction chamber or a flow rate of the refrigerant discharged from the discharge chamber is caused to become substantially constant.