Fuel-injection device for an internal combustion engine
US6886535B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | May 3, 2005 |
| Priority date | — |
| Expiry date | Dec 6, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/366
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve for each cylinder of the engine. The pump has at least one piston driven by the engine and delimiting a pump working chamber supplied with fuel from a fuel tank. A control valve at least indirectly controls a connection of the pump working chamber to a relief chamber and a pressure source in order to fill the pump working chamber during the intake stroke. The pump has a first pump piston inside which a second pump piston is guided approximately coaxially, with the two pistons delimiting the working chamber. The first piston is driven in a stroke motion, and the two pistons can optionally be coupled to move together as a unit during the delivery stroke, or the second piston can be fixed in a passive position so that only the first pump piston executes the delivery stroke.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.