Patent ID: 6381842
Filing Date: 2002-05-07
Classification: B23K,F04B,Y10T

Abstract:
A method of producing a hollow piston for a compressor including a head portion which is slidably fitted in a cylinder bore of the compressor, and an engaging portion which engages a reciprocating drive device of the compressor which reciprocates the piston, at least said head portion of the piston being hollow, said method comprising the steps of:forming a hollow cylindrical body member which has an open end at at least one of opposite ends thereof, and a closure member which closes said open end of said cylindrical body member, one of said cylindrical body member and said closure member having an annular shoulder surface and a circumferential surface which is adjacent to said annular shoulder surface, said annular shoulder surface and said circumferential surface cooperating with each other to define a female corner portion, the other of said cylindrical body member and said closure member having a male corner portion which corresponds to said female corner portion; and fixing said cylindrical body member and said closure member to each other, so that said male corner portion engages said female corner portion, and wherein said step of forming said cylindrical body member and said closure member comprises at least one of (a) a step of forming an annular groove at a position of one of said annular shoulder surface and said circumferential surface of said female corner portion, said position being adjacent to the other of said annular shoulder surface and said circumferential surface, and (b) a step of forming an edge-free part in said male corner portion.