Variable timing camshaft drive system

Details Variable timing camshaft drive system Variable timing camshaft drive system

1995-08-17

1997-03-04

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 9031, 474110, 474111, F01L 134, F16H 5304

Patent

active

056069413

ABSTRACT:
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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German Journals DE-Z ATZ Automobiltechnische Zeitschrift 93 (1991), vol. 10; MTZ Motortechische Zeitschrift 52 (1991), vol. 12.

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