Cam shaft for internal combustion engine

US5577420A · kind A · utility

Inventors

• Helmut Riemscheid · Lohmar, DE
• Karl Weiss · Sankt Augustin, DE
• Herbert Frielingsdorf · Lohmar, DE
• Peter Amborn · Neunkirchen, DE
• Stefan Magirius · Bonn, DE
• Klaus Greulich
• Gretel Schmidt · Neunkirchen, DE
• Peter Urban · Neunburg vorm Wald, DE

Key dates

• Filing date: Dec 28, 1993
• Grant date: Nov 26, 1996
• Expiry date: Dec 28, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/2101
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A cam shaft for valve operation in an internal combustion engine comprises two shaft elements of which the first (101, 201) is disposed inside the second (102, 202) and can be moved relative thereto angularly and/or axially. First cam elements (107, 207) provided on the first shaft element have at least lobe portions which extend radially outwardly through slots in the second shaft element to provide a cam surface, while second cam elements are provided on the second shaft element. The first and/or the second shaft element may comprise a number of individual tubular sections joined to one another.