Patent ID: 6095103
Filing Date: 2000-08-01
Classification: F02B,F02D,Y02T

Abstract:
An exhaust control valve structure for a 2-cycle engine comprising:an exhaust passage communicating with an exhaust port of a cylinder hole, said exhaust passage including a first passageway extending in a direction intersecting a central axis of the exhaust port and a second passageway communicating between the exhaust port and said first passageway;an exhaust control valve for varying a cross-sectional area of said exhaust passage, said exhaust control valve being mounted for rotation between open and closed positions about an axis generally parallel to an extending direction of said first passageway, a surface area of a communicating opening between said first passageway and said second passageway being varied as said exhaust control valve rotates, said exhaust control valve being a cylindrical tube having a cut-out formed in a wall of said exhaust control valve adjacent to said second passageway, said exhaust control valve including a first, closed end and a second, open end, said second, open end being mounted for rotation by a bearing;a lever attached to said second end, said lever extending radially outwardly from said second end of said exhaust control valve; anda cylinder mechanism having a piston rod thereof operatively connected to said lever for rotating said lever and said exhaust control valve between the open and the closed positions, said cylinder mechanism including a pressure chamber for receiving water under pressure to control operation of said cylinder mechanism.