Fuel-injection pump for internal combustion engines

US5591021A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Josef Guentert · Gerlingen, DE
• Karsten Hummel · Freising, DE
• Guido Kampa · Althengstett, DE
• Axel Paetz · Echterdingen, DE
• Karel Kolar · Lučenec, SK

Key dates

• Filing date: Nov 22, 1995
• Grant date: Jan 7, 1997
• Expiry date: Nov 22, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/265
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel-injection pump for internal combustion engines, particularly an in-line injection pump for diesel engine, with a control bore in the pump cylinder and with an upper control edge for determining the start of feed and an oblique spill edge for determining the end of feed. The pump piston is rotated about its longitudinal axis in order to set the desired feed quantity, for the purpose of achieving a better regulating behavior of the system as a whole, comprising the fuel-injection pump, feed-quantity regulator and internal-combustion engine. The spill edge is subdivided, along its run over a part of the circumference of the pump piston, into portions with different angles of inclination (.alpha..sub.1, .alpha..sub.2) to the axis of the pump piston. The control-edge portion having the large angle of inclination (.alpha..sub.2) is located in the region of the pump piston which passes over the control bore during the pump-piston stroke in a rotary position of the pump piston for small feed quantities (lowered load range of the internal-combustion).