Injector for high-pressure fuel injection

US6994272B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Michael Kurrle · Wissen, DE
• Reiner Koch · Obernburg, DE
• Joerg Fischer · Munich, DE

Key dates

• Filing date: Oct 15, 2002
• Grant date: Feb 7, 2006
• Expiry date: Jun 9, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/315
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An injector for high-pressure injection of fuel in self-igniting internal combustion engines includes an actuator valve for opening and closing the injector; a nozzle needle, which in the closed state of the injector closes at least one injection opening; a metering valve, which establishes a hydraulic communication between the actuator valve and the relief chamber of the injector; a pressure holding device, which serves to maintain a static pressure required for the metering valve; and a first control quantity line for control quantities that flow via the actuator valve, and a second control quantity line for control quantities that flow via the metering valve. The pressure holding device dynamically separates the control quantities of the metering valve from the control quantities of the actuator valve by means of a hydraulic fluctuation damper.