Patent · US Expired

Fuel injection pump for internal combustion engines

US4830587A · kind A · utility

7Cited by

4References

8Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Josef Guntert · Gerlingen, DE
Walter Hafele · Fellbach, DE
Johann Warga · Bietigheim-Bissingen, DE

Key dates

Filing date	Nov 18, 1987
Grant date	May 16, 1989
Priority date	—
Expiry date	Nov 18, 2007

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M59/24
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A fuel injection pump for internal combustion engines has a reciprocated pump plunger (3) and a control slide (5), which is displaceable on the latter, and comprises a control borehole (28) which cooperates with a helical groove (15) on the pump plunger (3), the helical groove (15) communicates with the pump work space (26) via a duct (24, 25). For the purpose of controlling the start of delivery, the helical groove (15) communicates with a cylindrical counterbore (21) at the end area (22) remote of the pump work space. Moreover, the end area (23) of the control groove (15), which end area (23) is close to the pump work space, can communicate with a second counterbore in order to ensure a zero delivery when the helical grooves (15) are relatively flat.

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