Internal combustion engine camshaft drive mechanism
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 6, 1992
Grant Date -
N/A
app pub date -
Oct 11, 1990
filing date -
Oct 13, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A camshaft drive mechanism operates the inlet valves of a first cylinder through a variable valve timing (VVT) mechanism at one end of an engine block and the inlet valves of a second cylinder through a VVT mechanism at the other end of the block. In a four cylinder engine the first cylinder is No 1 and the second cylinder is No 4, cylinders Nos 2 and 3 having separate VVT mechanisms adjacent the VVT mechanisms of cylinders Nos 1 and 4 respectively. A preferred form of VVT mechanism includes an eccentric sleeve which provides a journal for a driving member. Rotation of the eccentric sleeve in an offset bore alters the valve timing. By having the offset equal to the eccentricity of the sleeve the potential wear of the components of the VVT mechanism is reduced.
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