| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection pipe for a common rail which can inject fuel stably while suppressing pressure fluctuation in an injection pipe, and show stable sealability at the connection part of the injection pipe. SOLUTION: In a common rail, a branch hole, having a pressure receiving seat surface communicated with a main pipe rail 1 and opened to the outside, is formed on a boss 1-4 on a peripheral wall of the main pipe rail 1. An injection pipe 2a is connected to the common rail by abutting a pressurizing seat surface 2a-2 serving as a connection head against the pressure receiving seat surface 13 and engaging therewith, fastening together with pressurizing under a neck of the connection head 2a-2 caused by screwing of a screwing nut 4. A metal ring 3a having an orifice 3a-1 is embedded in the connection head 2a-2 of the injection pipe 2a, without influencing on sealability by the metal ring 3a. Axial force by the fastening nut 4 incorporated in the injection pipe side is applied as force for fixing the metal ring 3a. |
