Injection pump for internal combustion engines
US5015160A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Apr 5, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/46
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An injection pump for internal combustion engines having a pump piston bushing, a pump piston, guided in the bushing, including control edges for controlling the beginning and end of an injection event. The control edges cooperate with control bores provided in the wall of the pump piston bushing that discharge into a reservoir chamber surrounding the pump piston bushing; fuel can be delivered into this chamber under pressure, and excess fuel, or fuel overflowing at the end of an injection event, can be diverted from it. For the fuel delivery, a suction valve opening to the reservoir chamber is connected to the reservoir chamber, while for the fuel diversion, a check valve in the form of a pressure maintenance valve that opens away from the reservoir chamber is connected to the reservoir chamber. This pressure maintenance valve may be preceded on the inlet side by a throttle restriction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.