Fuel injection pumps
High pressure fluid pump
Fuel injection systems
Solenoid pump adapted for noiseless operation
Pump for fluids
ApplicationNo. 506534 filed on 07/25/1995
US Classes:417/417, Unitary pump and motor working member123/498, Piezoelectric drive417/490, Pumping member position controlled port417/499Having means to effect control at different positions of pumping member stroke
ExaminersPrimary: Thorpe, Timothy S.
Assistant: Korytnyk, Peter
Attorney, Agent or Firm
Foreign Patent References
International ClassesF04B 007/04
AbstractDisclosed herein is a fuel pump comprising a housing including therein a high pressure fuel chamber, a fuel outlet valve communicating with the high pressure fuel chamber and being operable to prevent fuel inflow and to permit fuel outflow when the fuel pressure is above a predetermined level, a fuel inlet valve communicating with the high pressure chamber and being operable to prevent fuel outflow and to permit fuel inflow, and a bearing bore extending from the high pressure chamber, a rod slideably and sealingly supported in the bearing bore for movement relative to a retracted position, and structure located in the housing for displacing the rod from the retracted position and in the direction toward the high pressure fuel chamber through an initial stroke length without encountering substantial resistance and thereafter displacing the rod through a subsequent stroke length which is effective to highly pressurize the fuel in the high pressure fuel chamber.