Fuel injection device for an internal combustion engine
US7017553B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2003 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Feb 25, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/46
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection apparatus having a high-pressure fuel pump and a fuel injection valve for each cylinder of an internal combustion engine, in which fuel pump has two pump pistons driven by the engine and delimiting a pump working chamber supplied with fuel from a tank. The second pump piston is guided to slide inside the first pump piston. The two pistons can be coupled so that they move as a unit during the delivery stroke or the second can be fixed in a passive position so that only the first executes a delivery stroke. The fuel injection valve a second injection valve element which is guided to slide inside a first injection valve element can be acted on by the pressure prevailing in a control pressure chamber which has a connection to the pump working chamber controlled by the second pump piston wherein the control pressure chamber is disconnected from the pump working chamber when the second pump piston is disposed in its passive position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.