Being the seal feature which seals the pulsation fuel pressure oil where the delivery pressure fluctuation intermittently

摘要

PROBLEM TO BE SOLVED: To improve reliability of an engine system by improving a seal mechanism of an O-ring which may cause oil leakage of a fuel pump, and thereby eliminating oil leakage. ;SOLUTION: A backup ring groove 3 is formed on the pressurizing side of an O-ring 1, independently on an O-ring groove 2. A backup ring 4 is fitted into the backup ring groove 3. A drain hole 5 is formed on a part of the backup ring groove 3. The backup ring groove 3 may be purally formed. In such a case, the backup ring 4 is fitted to each backup ring groove 3.;COPYRIGHT: (C)1998,JPO