| 摘要 |
PROBLEM TO BE SOLVED: To equalize the gap between a groove part, and an insertion part to join both parts by brazing surely. SOLUTION: The first sidewall part 111a is provided with the first projection part 1113a projecting toward the opposite side of a connection part 111c. Thereby, the first sidewall part 111a of a groove part 111 opens so as to expand the groove width by a spring back, so the tip of the first projection part 113a contacts with an inner wall surface 110a first at the time of compressing a tube 110. Thus, a reaction force against a compressive force at the time of temporary assembling acts on the tip of the first projection part 113a, and the tip of the first projection part 113a does not move due to its contact with the inner wall surface 110a. Thereby, the bending moment causing the reduction of the groove width acts on the first sidewall part 111a and the connection part 111c. Therefore, an insertion part 112 is pinched into the groove part 111 in such a manner that it is wound into the groove part 111 automatically, as compression proceeds. Thereby, the groove part 111 and the insertion part 112 can be joined by brazing surely.
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