Cast iron camshaft for internal combustion engines

US4838217A · kind A · utility

Assignee

• AUDI AG · DE

Inventors

• Max Ruf · Obereisesheim, DE
• Erwin Korostenski · Oedheim, DE

Key dates

• Filing date: Feb 10, 1988
• Grant date: Jun 13, 1989
• Expiry date: Feb 10, 2008

Classification

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

Abstract

A cast iron camshaft (1) for an internal combustion engine, has at one end a toothed pulley (3) engaging a toothed belt, and an internal tensile member including a screw threaded bolt (5). The bolt engages part of the camshaft (1) adjacent the end where the toothed pulley (3) is fixed, and extends along a longitudinal bore (6), and has a screw threaded end (8) which engages an internal thread (9) positioned adjacent the point where the bending moment exerted on the camshaft by the toothed belt tension P becomes zero. As a result, the alternating bending loads which would otherwise occur in the vicinity of the cross-section X--X which is in danger, are converted into a continuous compressive load, which can be sustained by the cast iron material more effectively than an alternating bending load.