Electromagnetic unit fuel injector
US4568021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1984 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Apr 2, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B3/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An electromagnetic unit fuel injector for use in a diesel engine includes a housing with a pump therein defined by an externally actuated plunger reciprocable in a bushing and defining therewith a pump chamber open at one end for the discharge of fuel to a spring biased, pressure actuated fuel injection nozzle. The pump chamber is also connected to a supply/spill chamber via a normally open, hollow, ported valve controlled passage to permit the ingress and egress of fuel, the valve being operated by a solenoid. The stator assembly of the solenoid is fixed to the housing over the supply/spill chamber and has a cover fixed thereto to define an armature chamber for a moveable armature. The solenoid pole piece has a stepped bore therethrough to interconnect the armature chamber and the supply/spill chamber. The armature is operatively connected to the valve by a guide pin slidably and sealingly journaled in a non-magnetic bushing fixed in the stepped bore so that the armature chamber remains dry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.