| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve an internal pressure fatigue strength by completely welding together a main pipe rail and a sleeve nipple, to completely prevent the occurrence of an influence of rust by preventing entrance of foreign matter and treating liquid to a weld part and remaining of them thereat, and to perform remaining of a compression residual stress at the periphery of the main pipe rail flow passage opening end part of a branch hole. SOLUTION: In this common rail, a sleeve nipple 2A is mounted on a main pipe rail IA through welding, A press set part forming a connection head part situated at the end part of a branch pipe is brought into contact and engagement with the pressure receiving seat of the sleeve nipple 2A and fastening is effected along with press under the neck of the connection head part through threaded engagement of a nut previously incorporated in the branch pipe side. In this case, the periphery of the opening end part on the outer peripheral side of the branch hole of the main pipe rail is cut in a flat. The sleeve nipple having a connection end part on which beveling processing is applied is welded to the flat part of the main pipe rail 1A, and a connection structure is provided to have no non-welded part on a joining surface between the main pipe rail 1A and a sleeve nipple 2A.</p> |
