Hydraulic valve control arrangement

US5809950A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Ulrich Letsche · Stuttgart, DE
• Ralf Gapp · Bad Wurzach, DE

Key dates

• Filing date: May 30, 1997
• Grant date: Sep 22, 1998
• Expiry date: May 30, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S137/906
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a hydraulic valve control arrangement particularly of an internal combustion engine wherein the valve has a valve stem by which it is supported so as to be slideable between a closed and an open position and first there are provided first spring means biasing the valve in the closed position and second spring means providing an opening force which is transmitted via a valve tappet and an end of the valve tappet is received in a cylinder which is engaged by the second spring means so as to form a hydraulic force transmitting structure to which hydraulic fluid can be admitted for tensioning the second spring means. The valve tappet has a control piston received in a control chamber to which pressurized fluid is admitted which holds the control piston in either of its open or closed valve end positions and a pressure space is arranged adjacent the closed valve end positions of the control piston to which pressurized fluid can be admitted for initiating opening of the valve.