Fuel injection pump
US4905640A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1989 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Mar 1, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M63/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pressure control valve is connected at one end with a suction chamber and with increasing pressure in the suction chamber shifts the instant of injection to early. A pressure relief line connects between a restoring chamber in the pressure control chamber with a pressure maintenance valve. The pressure maintenance valve includes a valve insert comprising a valve cylinder in which a compression spring-loaded valve body is disposed. The valve body has a sealing face that closes the pressure relief line. The diameter of the pressure relief line is smaller than the valve cylinder diameter. The diameter of the pressure relief line is selected such that the suction chamber pressure present at the sealing face moves the valve body away from the valve seat counter to the force of a compression spring contacting the valve body and opens up a pressure relief line leading onward. After the lifting of the valve body from the pressure relief line, the suction chamber pressure is present at the entire cross section of the valve body, and the force, now embodied by the cross section of the valve body and the suction chamber pressure established at idling rpm, attains a value, by comparison with…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.