Direct needle control fuel injectors and methods
US7412969B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2007 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Mar 13, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2547/006
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Direct needle control fuel injectors and methods disclosed. The preferred embodiment injectors have a needle within a needle chamber for movement between a closed position preventing injection of fuel and an open position allowing injection of fuel, a source of high pressure fuel coupled to the needle chamber to provide fuel for injection and to hydraulically urge the needle to the open position by pressurizing a first hydraulic area associated with the needle, a needle control hydraulic area having a second hydraulic area disposed to urge the needle to the closed position when the second hydraulic area is exposed to fuel under pressure, and valving coupled to the source of high pressure fuel and a vent to controllably couple the hydraulic area of the needle control member to the high pressure fuel or to the vent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.