| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reliable common rail for a diesel engine capable of obtaining clean pressure welding connection structure effectively squeezing out inclusion such as dirt and oxide, provided with a joining part excellent in durability against external force such as vibration, inner pressure and bending in common rails of a style fixing a branch connection body (branch connection metal fitting) on a common rail main body by friction welding (friction pressure welding). <P>SOLUTION: In the common rail having the branch connection body fastening a branch pipe supplying fuel to a injection nozzle of each cylinder by a nut fixed on the common rail main body made of thick wall steel pipe, solid bar or forging thereof by friction welding, a common rail main body facing surface of the branch connection body fixed on a branch connection body fixing surface which is a flat surface formed on the common rail main body by friction welding has a truncated cone shape slightly projecting at a center part and having gentle conical surface at circumference part thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
