High-pressure fuel pump for fuel injection system of internal combustion engine, has pump housing, in which drive shaft is supported by bearings, through which fuel is forced for lubrication or cooling

摘要

The high-pressure fuel pump (1) has a pump housing, in which a drive shaft is supported by bearings (35,36), through which fuel is forced for lubrication or cooling. A seal (46) is arranged between the drive shaft and the pump housing, which prevents unwanted leakage of fuel into the environment of the high-pressure fuel pump. A hydraulic resistance (54) is arranged between the bearings and seal, by which the pressure before the seal is lowered.