Patent ID: 7458785
Filing Date: 2008-12-02
Classification: F04B

Abstract:
1. A compressor with a lubrication structure, comprising: a rotary shaft; a piston; a suction pressure zone, the internal pressure of which is suction pressure; a driving body accommodating chamber; a driving body accommodated in the driving body accommodating chamber, wherein the driving body converts rotation of the rotary shaft into reciprocation of the piston, thereby causing the piston to compress gas; a gas passage that extends through the rotary shaft and communicates with the driving body accommodating chamber so that gas in the driving body accommodating chamber flows into the gas passage, wherein the gas passage includes an expansion portion formed in the rotary shaft along the axis of the rotary shaft, and wherein the expansion portion connects to the suction pressure zone so that the gas in the expansion portion flows into the suction pressure zone; and a fluid passage formed in the rotary shaft opening at one end to the expansion portion and at the other end to the driving body accommodation chamber, wherein the maximum cross-sectional area of the expansion portion is greater than the maximum cross-sectional area of a section of the gas passage that is upstream of the expansion portion with regard to gas flow in the gas passage.