Patent ID: 6393964
Filing Date: 2002-05-28
Classification: F04B,F05C

Abstract:
A compressor comprising:a housing having cylinder bores and a crank chamber; pistons having head portions and neck portions arranged such that said head portions are reciprocatingly inserted in said cylinder bores and said neck portions are connected to said head portions; a drive shaft extending through said crank chamber and rotatably supported by said housing; a cam plate arranged in said crank chamber and rotatable with said drive shaft; shoes arranged between said cam plate and said neck portions of said pistons; a piston rotation restricting structure comprising a first rotation restricting member formed on said neck portion of each piston, and a second rotation restricting member provided in said housing, said rotation restricting structure restricts rotation of said piston about its own axis while allowing a reciprocating motion of said piston; said first rotation restricting member comprising axially spaced end surfaces, and an outer peripheral surface between said end surfaces; and an inclined guide surface formed in one end surface of said first rotation restricting member and inclined toward said outer peripheral surface for guiding lubricant from the crank chamber into a gap between said first rotation restricting member and said second rotation restricting member when said piston moves in one direction or in the other direction, wherein said inclined guide surface is shaped such that lubricant is guided toward a center of said inclined guide surface.