Control unit for pressure regulation of oil pump of internal combustion engine, has grooves extending from retainer bore of crank case that is surrounded by piston housing, where grooves act as pressurized connections between ports

摘要

The unit has longitudinal grooves (16, 19, 21) extending from a retainer bore (7) of a crank case (31) that is surrounded by a tube shaped piston housing. The longitudinal grooves act as pressurized connections between ports (32, 34, 35) of the crank case. The grooves are designed as radial flat portions in the piston housing. A control piston exhibits a central bore for drainage of regulating oil.