Fuel injection nozzle for internal combustion engines

US4768719A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Max Straubel · Stuttgart, DE
• Ewald Eblen · Stuttgart, DE
• Paul Fussner · Sindelfingen, DE
• Gunter Kapolke · Hermeskeil, DE
• Edgar Schneider
• Klaus-Dieter Wolf · Cologne, DE
• Werner Wagner · Bad Nenndorf, DE
• Karl Hofmann · Neckarrems, DE

Key dates

• Filing date: Jul 17, 1987
• Grant date: Sep 6, 1988
• Expiry date: Jul 17, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/8015
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Fuel injection nozzle for internal combustion engines includes a first closing spring which acts continuously on the valve needle by means of a central pressure pin and, in addition, a second closing spring which acts continuously on the valve needle by means of a pressure piece after covering the distance of an initial stroke. The pressure piece is supported at the nozzle body by means of an intermediate bush during the initial stroke. The initial stroke is limited by means of the shoulders at the valve needle and the intermediate bush, whereas the total stroke is limited by means of the shoulders at the intermediate bush and the intermediate disk. Accordingly, the initial stroke can be adjusted very accurately to a desired magnitude merely by means of grinding the valve needle and does not change during the assembly of the injection nozzle.