Variable camshaft timing for internal combustion engine
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United States of America Patent
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Sep 10, 1991
Issued Date -
N/A
app pub date -
Sep 19, 1990
filing date -
Oct 16, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable camshaft timing arrangement for an internal combustion engine inhich a camshaft, for example, an intake valve operating camshaft in a dual camshaft engine, is advanced or retarded in its position relative to the crankshaft and to the exhaust valve operating camshaft in reaction to torque pulsations in such intake valve operating camshaft. In an engine having cam followers of the friction type, the unidirectionally acting torque on the camshaft which results from the friction between the camshaft and the followers can be offset by providing resilient means to act on one of the opposed cylinders to introduce a countertorque into the camshaft which is oppositely directed to the frictional torque.
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