Method of producing swash plate type compressor piston

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 cylindrical body member which has an open end at at least one of opposite ends thereof, and a closure member which has an annular abutting surface that is to be held in abutting contact with an end face of said cylindrical body member on the side of said open end thereof, and an annular protruding fitting portion which axially protrudes from said annular abutting surface and which is inserted into said open end of said cylindrical body member;
• and
• fixing said closure member to said cylindrical body member such that said annular protruding fitting portion of said closure member being inserted into said open end of said cylindrical member, and such that said annular abutting surface of said closure member is held in abutting contact with said end face of said cylindrical body member,
• 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 edge-free part at a radially inner end of said end face of said cylindrical body member, and (b) a step of forming an annular groove at a position of one of an outer circumferential surface and said annular abutting surface of said closure member, said position being adjacent to the other of said outer circumferential surface and said annular abutting surface.

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 cylindrical body member which has an open end at at least one of opposite ends thereof and which includes a large-diameter portion on the side of said open end, a small-diameter portion remote from said open end, and a shoulder surface between said large-diameter and small-diameter portions, and a closure member which has an annular abutting surface that is to be held in abutting contact with said shoulder surface;
• and
• fixing said closure member to said cylindrical body member such that said closure member is inserted into said large-diameter portion of said cylindrical body member with said annular abutting surface of said closure member being held in abutting contact with said shoulder surface of said cylindrical body member,
• 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 an inner circumferential surface and said shoulder surface, said position being adjacent to the other of said inner circumferential surface and said shoulder surface, and (b) a step of forming an edge-free part at a radially outer end of said annular abutting surface of said closure member.