Radial piston pump unit used in high-pressure injection systems for internal combustion engines, especially common rail injection systems, comprises a fuel-conveying pump with a spring-loaded low-pressure pump piston

摘要

Radial piston pump unit for high-pressure injection systems comprises a pump housing (1) containing a drive shaft (3) with an eccentric section (4) on which a lifting ring (5) sits which moves a high-pressure radial piston pump with at least one spring-loaded high-pressure pump piston (43) moving in a radial direction to the drive axis (71). The fuel-conveying pump driven by the drive shaft is designed as a radial piston pump with at least one spring-loaded low-pressure pump piston (26) moving in a radial direction to the drive axis. Preferred Features: The fuel-conveying pump has a modular construction. The axes of the high-pressure pump piston and the low-pressure pump piston are arranged in a common radial plane (70) to the drive axis.