Importance

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Abstract

Provided is a variable displacement compressor comprising a cylinder block having a plurality of cylinder bores, housing, a drive shaft rotatably supported by the cylinder block, a lug plate, a swash plate being rotated by the lug plate to vary a tilt angle thereof, a sleeve reciprocally moving along the drive shaft, an addition discharge passage for fluid communication between the swash plate chamber and the suction chamber, characterized in that the variable displacement compressor comprises: a communication hole being a part of the addition discharge passage and formed in the drive shaft in its longitudinal direction; and a lateral communication passage formed at the lateral side of the drive shaft to be connected to the communication hole such that the lateral communication passage is opened and closed by reciprocal movement of the sleeve. Therefore, even though the swash plate is at position of the maximum tilt angle, the temperature of the swash plate chamber is prevented from rising by making a smooth refrigerant flow from the swash plate chamber to the suction chamber, thereby maintaining higher lubrication ability.

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First Claim