Fuel injector with multiple variable timing
US5033442A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Jan 19, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel injector having both stepped and infinitely variable timing is disclosed. The fuel injector includes an injector housing and a plunger wherein the plunger includes an axial bore formed in the top of the plunger. A plunger top is mounted within the axial bore and is translatable between an upper position and a lower position. A coil spring having a predetermined spring rate is disposed in the axial bore for biasing the plunger top in the upper position. An upper and a lower piston are disposed above the plunger and are translatable within the injector housing. A timing chamber is formed between the upper piston and the lower piston. When the timing chamber contains timing fluid, the fluid serves as a hydraulic link between the upper and lower pistons and the fuel injector operates at a first level of advanced timing. When the timing fluid creates a force on said lower piston which is greater that the force created by the coil spring, the plunger top is pushed toward the lower position to operate the fuel injector at a second level of advanced timing. The second level of advanced timing is more advanced that the first level of advanced timing and may be infinitely variable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.