Patent ID: 8127635
Filing Date: 2012-03-06
Classification: F16H,Y10T

Abstract:
1. A twin clutch transmission comprising: a transmission having a plurality of pairs of gears corresponding to the number of speed stages between a main shaft and a countershaft; and a twin clutch disposed on the main shaft, the twin clutch transmission being adapted to transfer or block a rotational drive force of an engine to/from the transmission by means of the twin clutch, wherein the main shaft includes an inner main shaft and an outer main shaft rotatably supporting the inner main shaft; the twin clutch includes a first clutch adapted to transfer or block rotation drive force to be transmitted to the inner main shaft, and a second clutch adapted to transfer or block the rotational drive force to be transmitted to the outer main shaft; the transmission is configured to perform the transmission of the rotational drive force between adjacent speed change gears on each shaft by a dog clutch having a dog tooth and a dog recess; the transmission is so configured that, when a dog clutch to transmit the rotational drive force with a first speed gear and a dog clutch to transmit rotation drive force with a second speed gear are both engaged, speed is changed between first speed and second speed by switching a connected condition of the twin clutch; a shift drum is provided to switch an engagement condition of the dog clutch by driving a shift fork; the shift fork is configured to be driven along a guide groove formed in a surface of the shift drum; and the pattern of the guide groove is formed so that, when the shift drum is rotated by predetermined angles to change speed from neutral to first speed, the dog clutch for the first speed gear and the dog clutch for the second speed gear simultaneously engage, wherein the pair of gears comprises a slidable gear that is axially slidably mounted to select one pair of gears operable to transmit a rotary drive force to the countershaft, and a unslidable gear mounted axially unslidably; the slidable gear is provided on each of the inner main shaft, the outer main shaft, and the countershaft; the dog clutch is provided between the slidable gear and the unslidable gear adjacent to the slidable gear on the same shaft; and the rotational drive force is transferred or blocked between the slidable gear and the unslidable gear that are adjacent to each other on the same shaft by sliding the slidable gear by means of the shift fork.