| 摘要 |
PURPOSE:To realize optimum timing in correspondence to the speed of the engine by providing a long hole communicated with a suction port and a exhaust port of combustion chamber, on the outer surface of a cylindrical rotary valve, and moving the rotary valve in correspondence to the rotational speed of the engine in the axial direction thereof. CONSTITUTION:The cylindrical rotary valve 2 is provided on its surface with a long hole 15 communicated with a suction port or an exhaust port 9a of the combustion chamber 14 in a direction intersecting with the axis of the cylinder. The valve 2 has a spline part 2a and is engaged with a sprocket 19. The valve 2 is moved in the axial direction of the cylindrical form through a slider 6. As a result, the timing at which the suction port or exhaust port 9a communicates with the long hole 15 is changed, and the timing of opening and closing the valve suitable for the engine speed can be obtained. |
