Patent ID: 6394049
Filing Date: 2002-05-28
Classification: F02B,F02D,F02F,Y02T

Abstract:
An exhaust valve device for a two-cycle engine comprising:a first exhaust valve for varying an exhaust timing of an exhaust port; a second exhaust valve for varying a sectional area of an exhaust passage; a common drive shaft rotated at a prescribed valve drive timing drivingly engaging said first exhaust valve and said second exhaust valve, wherein a second angular range of rotation of said second exhaust valve is larger than a first angular range of rotation of said first exhaust valve; and a linkage mechanism provided between said first exhaust valve and said second exhaust valve, said second exhaust valve integrally rotating with said first exhaust valve within the first angular range of rotation, and the second exhaust valve independently rotatable from said first exhaust valve when the second angular range of rotation exceeds said first angular range of rotation.