Fuel injector with telescoping armature overtravel feature
US8689772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2011 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Sep 19, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M2200/9007
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A common rail fuel injector includes a fuel inlet, a set of nozzle outlets, a drain outlet, a nozzle chamber and a needle control chamber. A needle control valve includes a ceramic control valve member movable between a closed position in contact with a flat valve seat to block the needle control chamber from the drain outlet, and an open position at which the needle control chamber is fluidly connected to the drain outlet. A solenoid actuator is mounted in the injector body and includes an armature movable between an overtravel position and an energized position, but the armature has a stable un-energized position between the overtravel position and the energized position. A needle valve member is positioned in the injector body and includes an opening hydraulic surface exposed to fluid pressure in the nozzle chamber, and a closing hydraulic surface exposed to fluid pressure in the needle control chamber. Armature overtravel is facilitated by a telescoping armature pin that includes a stem affixed to the armature and telescopically received in a pusher in contact with the ceramic control valve member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.