Valve timing control device for gas exchange valves on an internal combustion engine
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United States of America Patent
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-
Nov 3, 1998
Grant Date -
N/A
app pub date -
Oct 23, 1996
filing date -
Nov 9, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve timing control device (1) for varying opening and closing times of gas exchange valves of an internal combustion engine, characterized in that, in at least one of the pressure chambers (5, 6), there is arranged at least one spring means (13) whose spring force acts on the adjusting piston (4) to counteract an undesired adjusting direction (delayed opening and closing times t.sub.N+) of the adjusting piston (4) caused by a drag and frictional torque M.sub.S of the camshaft (2) during operation of the internal combustion engine, whereby the drag and frictional torque M.sub.S in a low-speed, low-load range of the internal combustion engine is substantially counteracted by an oppositely directed torque M.sub.F obtained from the spring force of the spring means (13).
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