Fuel injector with direct needle control for an internal combustion engine
US7419103B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 1, 2006 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Oct 23, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/705
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector with direct needle control has a nozzle needle guided in a nozzle body, and an actuator and a hydraulic pressure boosting unit that has an actuator pressure boosting piston connected to the actuator and a nozzle needle pressure boosting piston connected to the nozzle needle. The actuator pressure boosting piston and the nozzle needle pressure boosting piston both act on a coupler chamber. The nozzle needle pressure boosting piston contains a cylindrical chamber in which a control piston is axially guided, whose coupler chamber pressure surface is exposed to the coupler chamber and whose differential pressure chamber pressure surface is exposed to an inner differential pressure chamber contained in the cylindrical chamber. At its end oriented away from the coupler chamber, the nozzle needle pressure boosting piston is associated with an outer differential pressure chamber that communicates with the inner differential pressure chamber via a hydraulic connection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.