| 摘要 |
PROBLEM TO BE SOLVED: To detect leakage of fuel from a seat part by constituting so as to derive fuel to the outside of a head cover when fuel leaks from a seat surface of a pressing seat surface in a connection head part of an injection pipe main body and a pressure receiving seat surface part of an opposite member constituted of a nozzle holder. SOLUTION: In an injection pipe main body 1, an annular washer 2a is disposed at the back of a connection head part 1-1, a fastening nut 3 is fastened, a pressing seat surface part 1-1a of the connection head part 1-1 is made to abut and engage on/to a pressure receiving seat surface part 5a of a nozzle holder 5 and a seat part 9 is formed. At this time, when fuel leaks from the seat part 9, the fuel passes between the connection head part 1-1 and the fastening nut 3 and is made to flow in a washer 2a side. After the fuel passes through a circular hole groove 2a-1 formed within the washer 2a and is made to flow into the inside of the fastening nut 3, the fuel is made to flow to the outside of a head cover 11. As a result, leakage of fuel from the seat part 9 is quickly detected accurately to cope with fuel leakage. |
