Hydraulic actuator for a gas exchange valve

US6776129B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Udo Diehl · Stuttgart, DE
• Karsten Mischker · Leonberg, DE
• Uwe Hammer · Hemmingen, DE
• Volker Beuche · Stuttgart, DE
• Peter Lang · Gelnhausen, DE
• Stefan Reimer · Markgröningen, DE

Key dates

• Filing date: Jun 18, 2003
• Grant date: Aug 17, 2004
• Expiry date: Jun 18, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34446
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A hydraulic actuator for gas exchange valves of internal combustion engines is disclosed, in which the lifting of the gas exchange valve from the valve seat is effected with great force. The opening motion of the gas exchange valve then ensues at reduced force. Upon closure of the gas exchange valve, the gas exchange valve is braked before striking the valve seat, so that operation of the gas exchange valve with little wear and little noise can be achieved.