| 摘要 |
PURPOSE:To provide an automatic transmission having a simple structure with no clutching operation, by frictionally engaging an axially movable speed change ring with the conical surfaces of plural conical rollers for carrying out planetary movement. CONSTITUTION:A transmission having conical rollers 9 each of which is formed with a first frictional transmission surface 3 engaged with a transmitting wheel 2 fitted onto an input shaft 1 and a second frictional transmission surface 6 engaged with a transmitting wheel 5 fitted onto an output shaft 4, in addition to a conical surface 8 engaged with a speed change ring 7. When the speed change ring 7 is moved in the direction in which the effective diameter of the conical surface 8 is increased, the rotational speed of the output shaft decreases. This action is due to frictional force between the conical surface and the speed change ring. When the speed change ring 7 displaces to the lower section of the conical surface, the rotation of the output shaft stops so that this action makes effective in establishing the condition equivalent to the condition of disengaging of a clutch. |
