Valve drive for internal combustion engines for actuating gas exchange valves

US8904977B2 · kind B2 · utility

Assignee

• IAV GmbH Ingenieurgesellschaft Auto und Verkehr · DE

Inventors

• Andreas Werler · Zwickau, DE
• Joerg Wutzler · Zwickau, DE
• Uwe Parsche · Chemnitz, DE
• Thomas Arnold · Winslow, US
• Jochen Luedemann · Chemnitz, DE

Key dates

• Filing date: Jul 25, 2012
• Grant date: Dec 9, 2014
• Expiry date: Oct 19, 2032

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/0476
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A valve drive device for switching the stroke of gas exchange valves of an internal combustion engine includes a camshaft configured, at least in part, as a hollow shaft. A cam unit includes at least two different cams disposed on the camshaft so as to be rotationally engaged and axially displaceable with respect thereto. An adjustment sleeve is disposed so as to be rotationally engaged on an adjustment shaft and rotatable and axially displaceable inside the camshaft. The adjustment sleeve includes thereon a closed adjustment contour extending about a circumference of the adjustment sleeve and is operatively connected to the cam unit through an adjustment clearance in the camshaft via a first coupling element configured to permanently engage in the adjustment contour. A further coupling element is configured to permanently engage in the adjustment contour and connect to the camshaft so as to be fixed in position.