Patent ID: 6942465

Claim:
A compressor comprising: a cylinder block having a cylinder bore for accommodating a piston, bearings for supporting an end portion of a drive shaft, and a shaft support bore disposed between the bearings and a rear end of the cylinder block; a front housing attached to a front end of the cylinder block and formed with a crank chamber in which the piston is reciprocally moveable due to rotation of the drive shaft; a rear housing attached to the rear end of the cylinder block via a valve plate and formed with a suction chamber and a discharge chamber therein; and a seal member attached to the drive shaft to seal a gap between the shaft support bore and the drive shaft, wherein a distal end portion of the drive shaft having a first gas extraction aperture is rotatably fitted in the shaft support bore adjacent to the valve plate having a second gas extraction aperture at the rear end of the cylinder block, in the first gas extraction aperture, one opening end thereof being directly open to the crank chamber and the other opening end thereof being open to the shaft support bore, and in the second gas extraction aperture, one opening end thereof being open to the shaft support bore and the other opening end thereof being open to the suction chamber.