Fuel injector for use in internal combustion engine
US6032879A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 16, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Jan 16, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M51/0682
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
When an electromagnetic coil receives an electric supply, a stationary core, a yoke, and a movable core form a magnetic circuit. The movable core is attracted to a side of the stationary core against the force provided by a return spring member. A fuel passage for injection of fuel is then opened. Axial direction stepwise differences are formed on the movable core. One end face of the stationary core opposes the stepwise difference through a first gap. A projection portion of the yoke is provided toward an inner side of the yoke. This projection portion opposes a position of a side to provide an axial direction magnetic attraction through a second gap. By the provision of the first and second gaps, plural axial direction magnetic attraction gaps are formed and become a part of the magnetic circuit. By increasing a magnetic attraction efficiency of the movable core, an improvement in performance of a fuel injector and a fuel injector having a compact size and a light weight structure can be attained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.