Fuel injection device for internal combustion engines, in particular unit fuel injector
US5040511A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1990 |
| Grant date | Aug 20, 1991 |
| Priority date | — |
| Expiry date | May 22, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/366
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection device of for internal combustion engines, particularly a unit fuel injector, having a pump piston preferably driven via a drive cam and having a free piston hydraulically driven by the pump piston, the free piston divides a pump chamber from a pressure chamber, from which a pressure line leads to an injection nozzle of the engine. Via a magnetic valve, the fuel to be injected is first metered into the pressure chamber during the intake stroke of the pump piston and subsequently, in the control stroke, an injection quantity determining the supply onset is metered into the pump chamber. The pump piston with spaced annular grooves serves as a reversal device. During the metering stroke, a maintenance pressure that is lower than the metering pressure of the fuel and is generated via a pressure control valve is maintained in the pump chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.