Multiple radial piston pump with integral pressure relief valve, suitable for common rail injectors on internal combustion petrol engines

摘要

A radial piston pump has an eccentrically mounted shaft (10) in a housing (2), by which the radially arranged pistons (24,36) of at least two pumping modules (4,6,8) are driven. The high pressure connections (44) of each module are joined by a pressure bore (62) to a discharge nozzle (16). A pressure regulator valve (18) , fitted co-planar with the pump modules, is provided to limit the pressure in the bore (62).