High-pressure fuel-feed pump

Details High-pressure fuel-feed pump High-pressure fuel-feed pump

1995-06-23

1996-10-22

Gluck, Richard E.

Pumps

Expansible chamber type

Pumping member position controlled port

F02M 5944, F02D 102

Patent

active

055671349

ABSTRACT:
A protruding portion is formed integrally on a lower portion of a cylinder so as to protrude from the cylinder. A seal member has a tubular shape with an end. A hole is disposed at the end. Around the hole, a lip portion made of resilient material is disposed. The seal member is mated to an outer peripheral wall of the protruding portion by press-fitting. The lip portion can thin a fuel-oil film covering an outer peripheral wall of a plunger. The amount of leakage of fuel or oil is reduced. Because the protruding portion can be formed compactly and of thick plate thickness by press-fitting the seal member into the protruding portion formed integrally with the cylinder, deformation during heat treatment of the cylinder can be reduced, and along with the, machining of a sliding hole becomes simple.

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