Dr. Ing. H.c. F. Porsche Aktiengesellschaft

Richard Wenzel Gmbh & Co Kg

Andreas Jaksch

Alfred Trzmiel

Wolfgang Stephan

Olaf Fiedler

Thomas Alber

A variable valve timing camshaft drive system is provided with an adjusting device arranged between the loose end and the load end of a chain which is operative between chain wheels of two parallel camshafts of an internal-combustion engine. For tightening the chain and influencing the relative rotating position of a camshaft--variable valve timing--the device comprises a first hydraulic piston and a second hydraulic piston. The first hydraulic piston can be alternately acted upon by pressure and, in the process, takes up two end positions. By means of a third hydraulic piston, the first hydraulic piston may also be fixed in an intermediate position.

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Esslingen, Germany

Andreas Jaksch