Fuel injection device for internal combustion engines
US6021760A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1999 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Apr 30, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/704
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection device for internal combustion engines in which the motion of a fuel injection valve member is controlled by the pressure in a control chamber. The pressure in the control chamber is controlled by a control valve whose valve member is actuated by way of a hydraulic chamber, with the pressure transmitted from a piezoelectric drive device. The valve member is provided with two sealing surfaces that cooperate with oppositely disposed first and second valve seats wherein when the valve member moves from the first valve seat to the second valve seat, a short-term relief of the control chamber takes place in order to trigger a short pre-injection of fuel. For larger fuel injection quantities, the control valve is brought into an open position between the first and second valve seats or in a closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.