Double-injection type fuel injection valve
US4359191A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1981 |
| Grant date | Nov 16, 1982 |
| Priority date | — |
| Expiry date | Feb 25, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injection valve including a first nozzle spring and a second nozzle spring provided in its nozzle holder, wherein fuel injection is carried out in such a double-step manner that lifting of the nozzle needle through the initial injection stroke causes contraction of the first nozzle spring and subsequent lifting of the nozzle needle through the main injection stroke causes contraction of the second nozzle spring as well as the first nozzle spring. The first nozzle spring is supported by a first movable spring seat coupled to the nozzle needle, and the second nozzle spring by a second movable spring seat which engages a lift adjusting threaded member rotatably threadedly mounted in the nozzle holder for axial displacement relative to the nozzle holder, respectively. Axial rotative displacement of the lift adjusting threaded member causes corresponding axial displacement of the second movable spring seat through the second nozzle spring, whereby the gap between the first nozzle spring and the second nozzle spring can be adjusted within a range of between zero and a predetermined value determining the initial injection lift of the nozzle needle. Setting of the main injection val…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.