Patent ID: 8579611
Filing Date: 2013-11-12
Classification: F02M,F04B

Abstract:
1. A single plunger fuel pump comprising: a pump housing having an internal pumping chamber and a pressurized inlet line to an inlet valve that feeds the pumping chamber; a plunger assembly mounting bore in the housing defining a bore wall, a bore axis, and an end wall having an opening in fluid communication with the pumping chamber; a plunger sleeve in the plunger assembly mounting bore adjacent the pumping chamber, said plunger sleeve having a seal face at one end which bears on and seals against a seal surface at the end wall of the mounting bore; a pumping plunger reciprocable in the plunger sleeve inwardly toward and outwardly away from the pumping chamber; a plunger sleeve retainer secured at a predetermined position against the mounting bore wall and axially supporting the sleeve; a plunger return spring captured between a spring seat at an outer end of the plunger and a shoulder on the sleeve retainer; and a load ring situated between the sleeve retainer and the sleeve, urging the sleeve inwardly with a predetermined force determined by said position of the sleeve retainer sufficient to sealingly press the seal face of the sleeve against the seal surface at the end wall of the bore.