Fuel injector valve needle lift control arrangement
US4284049A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1979 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | Mar 21, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Control of valve needle lift in fuel injections for direct-injection internal combustion engines wherein an injector having at least one fuel supply pipe and one leak-off pipe is provided with a nozzle body in which is situated an axially slidably supported valve needle which is maintained by the force of at least one closing spring in its closing position and capable of being lifted off its valve seat by the pressure of the fuel. A sleeve is provided with connecting ports or openings in the injector which sleeve is capable of being moved axially by means of a hydraulic control medium. The connecting openings or ports can be covered by a piston when the end face of the sleeve is acted upon by the control medium, and when the valve needle is lifted off its valve seat, permitting the valve needle lift to be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.