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Balanced pressure gerotor fuel pump

United States Patent

August 3, 2004
View the Complete Patent at the US Patent & Trademark Office
A gerotor pump for pressurizing gasoline fuel is capable of developing pressures up to 2.0 MPa with good mechanical and volumetric efficiency and satisfying the durability requirements for an automotive fuel pump. The pump has been designed with optimized clearances and by including features that promote the formation of lubricating films of pressurized fuel. Features of the improved pump include the use of a shadow port in the side plate opposite the outlet port to promote balancing of high fuel pressures on the opposite sides of the rotors. Inner and outer rotors have predetermined side clearances with the clearances of the outer rotor being greater than those of the inner rotor in order to promote fuel pressure balance on the sides of the outer rotor. Support of the inner rotor and a drive shaft on a single bushing with bearing sleeves maintains concentricity. Additional features are disclosed.
Raney; Michael Raymond (Mendon, NY), Maier; Eugen (Clarkston, MI)
Delphi Technologies, Inc. (Troy, MI)
10/ 405,657
April 2, 2003
This invention was made with government support under Contract Number DE-SC02-98EE50526 awarded by the Department of Energy. The government has certain rights in the invention.