Fuel high pressure pump for internal combustion engine

摘要

A high-pressure fuel pump 1 for an internal combustion engine, with a pump piston 5 which can be actuated by the cam 2 of a camshaft 3 via a roller tappet 4 and which, during the inwards stroke, acts counter to the force of a prestressed spring element 6, of which one end is supported, on the tappet side, on a spring plate 8 and the other end is supported on an adjustable support body 9. The prestressing force of the spring element 6, with increasing rotational speed of the engine, is increased by loading the support body with pressure in dependence on rotational speed. The spring element may be a coil compression spring. It can also consist of a shape memory alloy having a spring constant which increases with speed.