Apparatus for adjusting the injection onset in a fuel injection pump
US4753211A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D1/183
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An adjusting apparatus for the injection onset of a fuel injection pump includes a spring-loaded adjusting piston which shifts a rotationally adjustable roller ring of a cam drive of an injection pump relatively toward an associated revolving portion in a direction of an early or late injection onset. The adjusting piston defines two control pressure chambers, both of which are acted upon by the supply pressure, of a fuel feed pump which rises as a function of rpm. One chamber can be pressure-relieved via an overpressure valve and the pressure in the other chamber is controlled via a switching valve which is controlled in accordance with temperature. In the control pressure chambers, springs are provided to act upon the adjusting piston and to counteract the pressure in the respective chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.