Patent ID: 7661720
Filing Date: 2010-02-16
Classification: F16L

Abstract:
1. A connection structure for connecting dissimilar metal tubes, comprising: a metal bellows tube having a reinforcement portion disposed on an outer surface of bellows of the metal bellows tube, and a metal tube composed of a material different from that of the metal bellows tube, the metal bellows tube being integrally connected to the metal tube, wherein a connection section on a metal bellows tube side includes the nipple having a base joined to the reinforcement portion and a connection end extending to a metal tube side farther than an end face of the crimp collar, and the crimp collar having a smaller-diameter portion extending to the metal tube side and a larger-diameter portion located on the metal bellows tube side of the metal bellows tube, the smaller-diameter portion of the crimp collar being continuous with the larger-diameter portion of the crimp collar, and wherein a connection section on the metal tube side includes the sleeve having a base joined to the connection end of the metal tube and a fitting end extending to the metal bellows tube side, and the fitting end of the sleeve extending to the metal bellows tube side being externally fitted on the smaller-diameter portion of the crimp collar extending to the metal tube side, and an outer surface of a connection end of the nipple being bonded and fixed to an inner surface of the connection end of the metal tube with a thermosetting resin while an end face of the reinforcement portion of the metal bellows tube and the end face of the crimp collar are in contact with or close to an end face of the connection end of the metal tube, and wherein the larger-diameter portion is larger than the smaller-diameter portion.