Two-cycle engine
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United States of America Patent
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-
Nov 17, 1987
Grant Date -
N/A
app pub date -
Aug 27, 1985
filing date -
Aug 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-cycle engine includes a port timing control device including a port timing control valve which is mounted on a cylinder block and has a timing control surface. The control valve is movable in a plane substantially perpendicular to the axis of a cylinder between a closed position where the valve is disposed in an exhaust passage with the control surface closing the end portion of the exhaust port closer to a cylinder head and an open position where the valve is held out of the exhaust passage to open the end portion of the exhaust port. The control surface is of an arcuate concave shape and having a curvature substantially equal to that of an inner peripheral surface of the cylinder so as to be smoothly continuous with the inner peripheral surface of the cylinder.
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