Camshaft for the operation of valves of an internal-combustion engine

US6666179B2 · kind B2 · utility

Assignees

• Dr. Ing. h.c. F. Porsche AG · DE
• Hydraulik-Ring GmbH · DE

Inventors

• Gerold Sluka · Neckartailfingen, DE
• Edwin Palesch · Lenningen, DE
• Wolfgang Stephan · Heidelberg, DE
• Axel-Willi Jochim · Jeffery Road, DE
• Andreas Knecht · Herrenberg, DE

Key dates

• Filing date: Jul 9, 2001
• Grant date: Dec 23, 2003
• Expiry date: Aug 10, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L1/3442
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A camshaft includes a device for hydraulic adjustment of a relative rotating position of the camshaft for the purpose of influencing valve timing. The device has a drive wheel, a cell wheel, and an impeller. The impeller is disposed by way of vanes within cells of the cell wheel and can carry out relative motion. A locking arrangement, which operates in the starting phase of the internal-combustion engine, is provided between the cell wheel and the impeller. The locking arrangement is formed by an axially spring-loaded, hydraulically operated piston housed in one of the vanes of the impeller and by a corresponding receiving device for the piston provided in a constructional unit consisting of the drive wheel and the cell wheel. The piston, which projects by way of a locking section into the receiving device and is guided in the vane, cooperates with an operating element for optimizing the locking arrangement. The piston is acted upon from a first pressure space, and the operating element is acted upon from second pressure space.