Common rail fuel pump with combined discharge and overpressure relief valves
US8132558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2009 |
| Grant date | Mar 13, 2012 |
| Priority date | — |
| Expiry date | Sep 20, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7838
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A high pressure piston fuel pump having a discharge check valve between the pumping chamber and a pressurized fuel reservoir and a pressure relief valve between the fuel reservoir and a passageway in the housing, wherein the discharge check valve and the pressure relief valve are contained within a single fitting assembly affixed at the pump housing. A first end flow passage is in fluid communication with the pumping chamber and provides an inlet to the discharge check valve and an outlet from the pressure relief valve. A second end flow passage is in fluid communication with the fuel reservoir and provides an outlet for the discharge check valve and an inlet for the pressure relief valve. Advantages include the ability to pre-test the outlet check and pressure relief prior to assembly into the pump housing, and improved flexibility of the outlet fitting location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.