Hydraulically controlled actuator for actuating gas exchange valve on the exhaust side of an internal combustion engine

US6978748B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Udo Diehl · Stuttgart, DE
• Bernd Rosenau · Asperg, DE
• Uwe Hammer · Hemmingen, DE
• Volker Beuche · Stuttgart, DE
• Peter Lang · Gelnhausen, DE
• Stefan Reimer · Markgröningen, DE

Key dates

• Filing date: Jan 31, 2003
• Grant date: Dec 27, 2005
• Expiry date: Jan 31, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L9/10
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A hydraulically controlled actuator for actuation of an exhaust-side gas exchange valve of an internal combustion engine, containing a control piston that is displaceable within a cylinder and, with piston sides facing away from one another, delimits pressure chambers, of which the one pressure chamber impinges upon the gas exchange valve in the closing direction and the other pressure chamber impinges upon the gas exchange valve in the opening direction. In the actuator is provided at least one spring element, which can be brought into a preloaded state by the control piston moving in the closing direction of the gas exchange valve, and whose stored potential energy accelerates the gas exchange valve in the opening direction at least at the beginning of an opening phase, is provided. This results in a reduction in the energy expended in the context of valve actuation.