Device for damping the needle lift in fuel injectors

US7083113B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Martin Kropp · Ditzingen, DE
• Hans-Christoph Magel · Pfullingen, DE
• Manfred Mack · Riedlingen, DE
• Christian Grimminger · Leonberg, DE

Key dates

• Filing date: Apr 9, 2003
• Grant date: Aug 1, 2006
• Expiry date: Apr 9, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/304
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection apparatus for injecting fuel into the combustion chambers of an internal combustion engine. includes a high pressure accumulator, a pressure booster, and a metering valve. The pressure booster includes a working chamber and a control chamber that are separated from each other by an axially movable piston. A pressure change in the control chamber produces a pressure change in a compression chamber that acts on a nozzle chamber via a fuel inlet. The nozzle chamber encompasses a nozzle needle. A nozzle spring chamber that acts on the injection valve element can be filled on the high-pressure side via a line that leads from the compression chamber and contains an inlet throttle restriction. On the outlet side, the nozzle spring chamber is connected to a chamber of the pressure booster via a line that contains an outlet throttle restriction.