Patent ID: 8042420

Claim:
A twin clutch type speed-change apparatus comprising: a transmission having a plurality of gear pairs between a main shaft and a counter shaft; and a twin clutch provided on the main shaft, the twin clutch being adapted to connect or disconnect a rotational drive force of an engine between the engine and the transmission; said main shaft being composed of an inner main shaft and an outer main shaft rotatably supporting the inner main shaft, said twin clutch being composed of a first clutch adapted to connect or disconnect the rotational drive force transmitted to the inner main shaft and a second clutch adapted to connect or disconnect the rotational drive force transmitted to the outer main shaft, said transmission is configured to execute transmission of the rotational drive force between speed-change gears adjacent to each other on each of the shafts by means of a dog clutch composed of a dog tooth and a dog aperture; and wherein the speed-change apparatus includes: a gear position sensor for detecting a speed-change step number of the transmission on the basis of a turning position of a shift drum; an inner main shaft rotational speed sensor for detecting a rotational speed of the inner main shaft; an outer main shaft rotational speed sensor for detecting a rotational speed of an outer main shaft; and a control unit for shift-controlling the transmission; wherein the control unit detects an engagement state of the dog clutch on the basis of a rotational speed difference between the inner main shaft and the outer main shaft and of information on the speed step number.