Patent ID: 8516996

Claim:
A fuel injection system for an internal combustion engine, comprising: a cylinder head; an injector pocket extending through the cylinder head to a combustion chamber, with said pocket having a conical lower wall; a fuel injector mounted within said injector pocket and extending to said combustion chamber, with said injector having a conical mounting surface for engaging the conical lower wall of said injector pocket; and an isolator mounted between the conical mounting surface of said injector and said lower wall of said injector pocket, with said isolator comprising a conical ring having an outer surface; and an inner surface, with said isolator being configured so that: at lower injection loads, only an upper contact portion of said outer surface of the conical ring contacts said conical lower wall of said injector pocket; at lower injection loads, only a lower contact portion of said inner surface of the conical ring contacts said conical mounting surface of said injector; and at higher injection loads, the portion of the conical ring extending between the upper contact portion and the lower contact portion is clamped between the conical mounting surface of the injector and the conical lower wall of the injector pocket.