SEALING STRUCTURE FOR FUEL PASSAGE AND FUEL INJECTION VALVE EQUIPPED WITH THE SEALING STRUCTURE

摘要

PROBLEM TO BE SOLVED: To prevent a seal member from being pushed out in a low pressure side and rising simultaneously. SOLUTION: This sealing structure 30 of a fuel injection valve is provided with an annular seal member 31 provided in a pressure introduction chamber 21 for sealing to prevent high pressure fuel in the pressure introduction chamber 21 from leaking in the low pressure side through a gap 28 formed between an injector housing 2 and a valve body 6 having a valve piston 5 slidably inserted therein. A rigid back up ring 32 is provided between the gap 28 and the seal member 31 and a retention mechanism for retaining the seal member 31 is provided on the back up ring 32. COPYRIGHT: (C)2005,JPO&NCIPI