| 摘要 |
In an internal-combustion engine comprising at least one cylinder having a port and a piston which is reciprocable to open and close said port, the effective axial extent of said port is adapted to be reduced by a restricting member, which is movably mounted adjacent to a flow passage which adjoins said port. The restricting member has a restricting edge and is movable to a restricting position in which said restricting edge is substantially flush with the peripheral surface of the cylinder bore. The restricting member defines the exhaust passage on one side thereof adjacent to the exhaust port. In order to improve the cooling of the cylinder and the exhaust gas flow, the restricting member constitutes a hinged member, which is pivoted on an axis at that end which is opposite to the restricting edge.
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