Patent ID: 8007251

Claim:
A high pressure radial piston fuel pump having an hydraulic head with at least two individual radial pumping pistons and associated pumping chambers, annularly spaced around a cavity in the head where a rotating eccentric drive member with associated actuation ring are situated, characterized in that a rolling interaction is provided between the actuation ring and the inner ends of the pistons for intermittent actuation, and relative rotation is provided between the actuation ring and the drive member, the head is attachable to a removable mounting plate, the drive member is rigidly carried by a drive shaft which is rotationally supported by two bearings, one located in the mounting plate and the other in the hydraulic head; a feed fuel valve train is provided in the head for delivering charging fuel through an inlet passage in the head at a feed pressure to the pumping chamber; a high pressure valve train is provided in the head for delivering pumped fuel to a discharge passage in the head at a high pressure from the pumping chamber; a semi rigid yoke in the cavity connects all the pistons and forces an inactive piston toward bottom dead center, while another piston is pumping.