Patent ID: 7717432

Claim:
A plunger seal assembly for a pump, the plunger seal assembly being provided in an annular space between a shaft reciprocating within a high-pressure fuel injection pump and a housing, sealing a high-pressure fuel in a side of a sealed object and sealing an oil in an opposite side to the sealed object, said plunger seal assembly comprising: a metal ring mounted on an enlarged inner peripheral portion of the housing in the annular space; said metal ring having a cylindrical cross-section; a seal member mounted in said annular space; and an elastic member mounted on said seal member, said seal member including: a seal fixing portion pinched between an end surface of said metal ring and an end surface of said enlarged inner peripheral portion; a first seal lip brought into close contact with an inner peripheral surface of said metal ring; a body portion of the seal member being located between the seal fixing portion and the first seal lip, a gap defined between an outer surface of the body portion and the inner peripheral surface of the metal ring; a second seal lip slidably brought into close contact with said shaft, and said first and second seal lips constituting a fuel seal member directly sealing said high-pressure fuel; and an oil seal member positioned in the opposite side to the sealed object from said fuel seal member, slidably brought into close contact with said shaft and sealing said oil; said seal member being integrally made of a resin material; said elastic member being mounted on an outer peripheral surface of a leading end portion of said second seal lip to apply an energizing force to said second seal lip in a diametrical direction.