Stroke-controlled valve as a fuel metering device of an injection system for internal combustion engines
US6802300B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Dec 18, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/0017
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A lift-controlled valve as a fuel metering device of an injection system for internal combustion engines has a valve needle which may be actuated axially against the resistance of a spring, the valve needle being situated in a graduated coaxial recess in a valve body and interacting with a valve seat formed in the recess of the valve body in this case controlling the fuel injection process; the valve has in addition a high-pressure area which is connected to an assigned injection nozzle and which is located upstream from the valve seat, a low-pressure area which is located downstream from the valve seat and which opens out into a fuel return flow, and a low-pressure equalizing piston which coaxially adjoins the valve and which is fixedly connected to the valve needle. The characterizing feature is that a first control edge is formed on the low-pressure equalizing piston, the control edge interacting with a second control edge on the valve body recess in the area of the fuel return flow or in such a way that a throttle cross-section which is dependent on the valve lift is formed between the two control edges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.