Fuel injector with needle control system that includes F, A, Z and E orifices
US8448878B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2010 |
| Grant date | May 28, 2013 |
| Priority date | — |
| Expiry date | Oct 8, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/0043
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A common rail fuel injector includes a needle valve member that moves to open and close nozzle outlets for a fuel injection event responsive to pressure in a needle control chamber. Between injection events, the needle control chamber is fluidly connected to the fuel inlet by a first pathway that includes a Z orifice, and fluidly connected to the fuel inlet by a second pathway that includes an F orifice, an intermediate chamber and an A orifice. During an injection event, the needle control chamber is fluidly connected to a drain outlet by a third pathway that includes the A orifice, the intermediate chamber and an E orifice. Different performance characteristics are achieved by adjusting the sizes of the respective of F, A, Z and E orifices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.