Patent ID: 9494121
Filing Date: 2016-11-15
CPC Classification: F02M

Claim Text:
1. A fuel pump assembly for use in an internal combustion engine, the fuel pump assembly comprising: a pumping plunger for pressurising fuel within a pumping chamber during a plunger pumping stroke; and a cam follower arrangement for imparting drive to the pumping plunger including a cam follower member which cooperates with the pumping plunger, the cam follower arrangement being biased into engagement with a cam drive whilst a degree of relative movement along the plunger axis is permitted between the cam follower member and the pumping plunger; characterised in that at least one of the pumping plunger and the cam follower member includes a surface provided with a feature which defines together with a facing surface of the other of the pumping plunger and the cam follower member, a cushioning volume therebetween for receiving fluid to provide a cushioning effect as the pumping plunger and the cam follower member move into contact with one another, in use, wherein the feature includes a flat central portion and an annular region, which is conical in form and which is angled relative to the facing surface.