Patent ID: 9217523
Filing Date: 2015-12-22
Classification: F16L

Abstract:
1. A connecting structure, comprising: a tube body made of metal and having a tube connecting part, the tube connecting part having an annular ridge with an inclined surface for sealing, a connection pipe made of resin having a pipe connecting end, the tube connecting part being inserted into the connection pipe, and the pipe connecting end covering the tube connecting part, a press-fitting member having a tube shape being clamped between the tube connecting part and the pipe connecting end, a seal member that is positioned at one end of the press-fitting member and interposed between the pipe connecting end and the tube connecting part for sealing, wherein the press-fitting member consists essentially of a resin material and is arranged between an outer peripheral part of the tube connecting part and an inner wall of the pipe connecting end, the press-fitting member including a press-fitting body having: the press-fitting member being press-fit onto the outer peripheral part of the tube connecting part and the claws biting an inner wall of the pipe connecting end, the pipe connecting end includes a reduced diameter part with an annularly reduced diameter relative to other parts of the pipe connecting end, the reduced diameter part of the pipe connecting end having a structure and being arranged to retain the pipe connecting end in engagement with the claws of the press-fitting member, the tube connecting a part has an outer peripheral part with an annular retaining ridge and at least one rotational detent including an outwardly radially extending protrusion the press-fitting member has an inner peripheral part with an annular engaging portion and at least one engaging detent portion including a hole having a shape corresponding to the shape of the outwardly radially extending protrusion, the annular engaging portion of the press-fitting body engages the annular retaining ridge of the tube connecting part, engagement of the annular engaging portion of the press-fitting member with the annular retaining ridge of the tube connecting part prevents axial movement of the press-fitting member with respect to the tube connecting part, and the at least one engaging detent portion of the press-fitting body engages the at least one rotation detent of the tube connecting part, and engagement of the at least one engaging detent portion of the press-fitting member and the at least one rotation detent of the tube connecting part prevents rotation of the press-fitting member with respect to the tube connecting part.