Internal combustion engine comprising means for controlling the axial extent of an exhaust port in a cylinder
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United States of America Patent
Stats
-
Aug 23, 1983
Grant Date -
N/A
app pub date -
Mar 8, 1982
filing date -
Apr 2, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a two-stroke cycle internal combustion engine, cylinder structure has an inside peripheral surface which defines a cylinder bore and is formed with an exhaust port, which has an axial extent along the axis of said cylinder bore and communicates with said exhaust system. A piston is axially reciprocable in said cylinder bore and adapted to open and close said port. A restricting member is mounted in said cylinder structure adjacent to said port and adjustable between a full-flow position, in which said restricting member exposes said exhaust port throughout its axial extent, and a restricting position, in which said restricting member restricts the axial extent of said exhaust port. A positioning drive is operatively connected to said restricting member and operable to adjust said restricting member between said full-flow and restricting positions. The positioning drive is adapted to be controlled in dependence on the exhaust gas pressure in said exhaust gas system.
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