Gear pump for maintaining fuel injection pump of internal combustion engine, has housing provided with cover, where coating is provided at gear wheel or at drive shaft

摘要

The gear pump has a housing (2) provided with a cover (1). A coating (5) is provided at a gear wheel (3) or at a drive shaft (6). Units of upper surface are provided to cover the gear wheel or the drive shaft, which are lying close to cover or housing in a sliding manner. The cover and the housing are made of aluminum. The gear wheel is made of aluminum and steel. The coating is made a galvanically produced nickel alloy.