Fuel injection valve for internal combustion engines

US5727738A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl Hofmann · Neckarrems, DE
• Manfred Mack · Riedlingen, DE

Key dates

• Filing date: Nov 9, 1995
• Grant date: Mar 17, 1998
• Expiry date: Nov 9, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection valve for internal combustion engines having a valve element which is axially displaceable in a valve body and a valve retention body, which is configured as a twin-spring retainer and in which are arranged first and second valve springs acting on the valve element in the closing direction. The first valve spring acts continually on the valve element via a pressure pin, whereas the second valve spring acts on the valve element only after a certain opening stroke motion of the valve element, which motion traversed forms a preliminary stroke (h1), and, by this motion, subdivides the opening stroke motion of the valve element into a preliminary stroke against the force of the first valve spring and a residual stroke against the force of the first and second valve springs. In order to be able to undertake the formation of the injection curve described even in the case of high rotational speeds and full load, a damping space bounded by the valve element is provided on the injection valve, which damping space can be shut off during the opening stroke motion of the valve element during the residual stroke of the latter.