Patent ID: 7976288

Claim:
A refrigerant gas compressor comprising: a cylinder block with two ends formed with a plurality of cylinder bores; a front housing disposed at one of the two ends of the cylinder block; a rear housing disposed at the other end of the cylinder block; a drive shaft supported by the cylinder block and one of the front housing and the rear housing; a crank chamber formed in one of the front housing and the rear housing; a swash plate rotatably disposed in the crank chamber, the swash plate being driven by the drive shaft; a suction chamber and a discharge chamber formed in one of the front housing and the rear housing; a valve plate assembly disposed between the cylinder block and at least one of the front housing and the rear housing, a storage chamber that is separate from the crank chamber for storing therein oil separated from refrigerant gas; an oil passage connected to the storage chamber for the oil to flow from the storage chamber; a stepped portion at least partially formed in a gasket that receives part of the valve plate assembly; and an annular oil groove formed by the stepped portion and the valve plate assembly and connected to the oil passage for connecting the storage chamber with one of the crank chamber and the suction chamber, wherein at least a portion of the oil groove is radially offset from the oil passage.