Control valve for a fuel injector

US4653723A · kind A · utility

Assignee

• Klockner-Humboldt-Deutz AG · DE

Inventors

• Reda Rizk · Recklinghausen, DE
• Hans-Gottfried Michels · Lechenich, DE

Key dates

• Filing date: Jul 23, 1985
• Grant date: Mar 31, 1987
• Expiry date: Jul 23, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/46
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A control valve for a fuel injector, especially of an air-compressing, spontaneous-ignition, internal combustion engine. The control valve includes a valve body in the form of a piston valve which is axially movable in a housing chamber into a closure position and an open position, with the closure position being determined by a valve seat on the housing, and a seating surface edge on the piston valve. The housing chamber includes at least one high pressure connection, and a low pressure connection. The basic problem with a control valve of this general type is that when the piston valve strikes the valve seat, rebound movements are carried out by the piston valve, so that the closure position can only be reliably assumed after a certain time delay, thus negatively influencing the injection process. In order to avoid these drawbacks, it is possible to have the valve housing chamber, either between its valve seat and the high pressure connection on the one hand, as well as the high-pressure side of the piston valve adjacent the seating surface edge on the other hand, or between its valve seat and the low pressure connection on the one hand as well as the low-pressure side of the pis…