Patent ID: 9574536
Date: 2017-02-21
CPC Classifications: F02M

Claim:
1. A fuel injector comprising: a body having a fuel injection port, and a seal ring sealing a clearance between an outer surface of the body and an inner surface of an assembling hole into which the body is inserted to inject a fuel into an internal combustion engine, wherein: the body has a diameter-shrink surface of which an outer diameter is shrunk, the diameter-shrink surface has a radially concaved annular groove surface with which a tip end portion of the seal ring is engaged, the diameter-shrink surface has a base diameter-shrink surface of which outer diameter is larger than that of the radially concaved annular groove surface and is constant in an axial direction of the diameter-shrink surface, the body has a tapered surface of which outer diameter is gradually increased toward the body, the seal ring is made from elastic resin material having a thermal resistance to heat, and after the body is inserted into the assembling hole, when the gas pressure is applied to the seal ring, the seal ring is pushed to the tapered surface and is elastically deformed on the tapered surface so that the seal ring seals a clearance between the outer surface of the body and the inner surface of an assembling hole.