Patent ID: 7210309
Filing Date: 2007-05-01
Classification: F04B

Abstract:
1. A compressor, connected to an external refrigerant circuit, for compressing refrigerant gas, the compressor comprising: a first housing; a second housing; a cylinder block having a bore, the cylinder block being arranged between the first and second housings; a piston accommodated in the bore, the piston defining a compression chamber in the bore; a rotatable rotary shaft extending through the first housing, the cylinder block, and the second housing, the rotary shaft having a first end portion and a second end portion; a crank chamber defined in the first housing; a crank mechanism, accommodated in the crank chamber, for converting rotation of the rotary shaft to reciprocation of the piston; a suction chamber, defined in the second housing, for drawing in refrigerant gas from the external refrigerant circuit; a first seal for sealing the first housing at the first end portion of the rotary shaft; a second seal for sealing the second housing at the second end portion of the rotary shaft; a first lubrication chamber defined by the first seal around the first end portion of the rotary shaft in the first housing; a second lubrication chamber defined by the second seal around the second end portion of the rotary shaft in the second housing; and a shaft passage extending axially through the rotary shaft, the shaft passage being connected to the crank chamber via the first lubrication chamber and being connected to the suction chamber via the second lubricating chamber.