Low back-flow pulsation fuel injection pump
US7677872B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2007 |
| Grant date | Mar 16, 2010 |
| Priority date | — |
| Expiry date | Dec 4, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/243
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel pump assembly includes a pump bushing defining a dual-chambered pumping cavity, a fluid channel for shuttling fuel between the chambers, a plunger, and a plurality of fluid control valves. A first check valve is a pressure relief valve in fluid communication with an outlet of the pump bushing and with either an inlet of a second check valve or an inlet of the pump bushing. Another check valve or a control orifice may be used in parallel with the second check valve, with the third check valve or control orifice being positioned at least partially external to the fuel pump assembly. A vehicle includes a transmission, engine, a returnless high-pressure fuel pump assembly, and a low-pressure fuel line in fluid communication with an inlet side of an inlet control valve. The high-pressure fuel pump assembly inhibits a pressure pulsation from propagating through the low-pressure fuel line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.