| 摘要 |
A mechanical rotation limiting connection, defined between the end of a rigid metal cross-over tube and the adjacent end of a fuel rail, is disclosed. The coupling comprises a fitting that is inserted into, and permanently joined to, an open end of the fuel rail. The fitting includes a body complementary in shape to the fuel rail, with an enlarged flange at its trailing end, a tapered leading section, and an axial bore of stepped configuration. The leading section of the cylindrical cross-over tube is deformed into a polygonal shape that fits into the bore of the fitting; a transition section and a round section extend inboard of the leading section, and an enlarged annular collar encircles the cross-over tube. The leading section of the cross-over tube is inserted into the fitting, and mechanical members on the fitting are deformed or crimped over the annular collar on the cross-over tube to lock the tube within the fitting, and prevent inadvertent disassembly. Clearance between the leading end of cross-over tube and the axial bore in the fitting permits limited rotational movement. The extent of the removement is limited by flats in the bore of the fitting, by the movement of an orientation bead within the cut-out segment of a trailing flange, or other mechanical constraints. An O-ring seated about the round section of the tube fits in the stepped bore of the fitting to prevent leakage.
|
