| 摘要 |
Automatic gear-change device with stepped ratios including, inside a casing (1) a first shaft or input shaft (2) which receives the driving torque and transmits it by means of a first or second step-down gearing (13, 14) or (15, 16) to a second shaft or output shaft (4) supporting an epicyclic gear train (5) equipped with a first or second planetary gear (6, 7) connected to a movement output annulus (18) under the control of at least the first and the second clutch (9, 10) and of at least a first and a second immobilisation means (11, 12), characterised in that the first and the second clutch (9, 10) respectively allow the input shaft (2) to be secured to the first planetary gear (6) via the first step-down gearing (13, 14) or with the second planetary gear (7) via the second step-down gearing (15, 16). <IMAGE> |
