Fuel injection valve
US6367453B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Nov 2, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/004
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a fuel infection valve, a valve chamber of a three ways valve is selectively communicated to drain and high pressure conduits and also communicated, via a main orifice, to a control chamber for controlling valve opening and closing operations of a nozzle needle. The control chamber may be communicated via the main orifice and the valve chamber to the drain conduit or the high pressure conduit, when a valve body is driven by a piezo actuator to open or close the drain conduit and close or open the high pressure conduit. The control chamber is always communicated via a sub orifice to the high pressure conduit without bypassing the three ways valve. Accordingly, hydraulic pressure in the control chamber is slowly decreased at a valve opening time and is rapidly increased at a valve closing time so that a lift characteristic of the nozzle needle is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.