Patent · US Expired

Fuel injection pump for internal combustion engines

US4873956A · kind A · utility

5Cited by

5References

2Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Wolfgang Fehlmann · Stuttgart, DE
Gerald Hofer · Diez, DE
Dieter Junger · Stuttgart, DE
Anton Karle · Villingen-Schwenningen, DE
Helmut Laufer · Gerlingen, DE

Key dates

Filing date	Dec 17, 1987
Grant date	Oct 17, 1989
Priority date	—
Expiry date	Dec 17, 2007

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M59/44
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A fuel injection pump for internal combustion engines having an electromagnetic final control element, which in order to adjust the end or onset of injection engages a control slide, located in the pump interior. Via a control shaft, the final control element chamber is hermetically sealed off from the pump interior in order to keep water contained in the fuel from reaching current-carrying parts of the final control element. As a result, fluid communication exists only via the bearing gap of the slide bearing of the control shaft and the bearing gap functions as a throttle. The throttle forms a water separator, which further reduces the concentration of water in the already small quantity of fuel reaching the final control element chamber through the throttle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.