Patent ID: 7229103

Claim:
A heat exchanger tank-pipe connection structure comprising: a metallic heat exchanger tank having a pipe fitting port formed as an aperture in said metallic heat exchanger tank with a heat tank outer surface annular portion surrounding said aperture; a metallic connection cup having at a first end a tank fitted portion fitted into said pipe fitting port, said connection cup having an annular seat of greater diameter than said tank fitted portion, said annular seat being brazed to said heat tank outer surface annular portion in a liquid-tight fashion; said connection cup having at a second end a cylindrical portion with a cylindrical portion end surface and inner and outer cylindrical wall surfaces, said cylindrical portion having a plurality of circumferentially extending slits defining circumferentially extending caulking portions between said circumferentially extending slits and said cylindrical portion end surface, said caulking portions having inner edge surfaces formed by said circumferentially extending slits, outer edge surfaces formed by said cylindrical portion end surface, and side surfaces formed of said inner and outer cylindrical wall surfaces; a resin pipe having first and second ends, a pipe first end portion fitted into said connection cup, and an outer periphery of said pipe first end portion formed with an annular recess; an O-ring fitted to said annular recess of said resin pipe and scaling said resin pipe to said connection cup; said resin pipe having a first flange portion projecting radially outward, said first flange portion being disposed on said resin pipe between said annular recess and said second end of said resin pipe, said first flange portion having a front first flange face disposed facing a direction of said annular recess and a rear first flange face facing a direction of said second end of said resin pipe; said caulking portions being bent from a cylindrical formation shape radially inward to engage said inner edge surfaces against said rear first flange face with said wall surfaces of said caulking portions oriented orthogonal to said rear first flange face; and said resin pipe having a second flange portion projecting radially outward, said second flange portion being disposed on said resin pipe between said first flange portion and said second end of said resin pipe, said second flange portion having a front second flange face disposed facing a direction of said first flange portion and engaging said outer edge surfaces of said caulking portions to retain said caulking portions in engagement with said first flange portion.