| 摘要 |
1. An epicyclic gearbox with concentric input (4, 27) and output (21) shafts combined with a torque converter (1) connecting an engine shaft (2) to the said input shaft (4, 27), the epicyclic gear train being of the type having three forward and one reverse drive ratio and comprising two central sun wheels (9, 6), an annulus gear (20) and a planet carrier (16), with the latter carrying two sets of planets (14, 15) in which each planet (15) of the first set engages with the corresponding planet (14) of the second set, the planets (15) of the first set meshing with the first sun wheel (6) and the planets (14) of the second set meshing simultaneously with the second sun wheel (9) and with an annulus (20) with gear teeth on the inside, a first (12) and a second (18) locking device, a first (7) and a second (10) clutch and a free wheel (22), with this gearbox also comprising a third clutch (23) able to transmit to the planet carrier (16) a part of the power tapped off from the engine power so as to provide a fourth forward drive ratio, which gearbox is characterized in that the said third clutch (23) is mounted between the planet carrier (16) and the input shaft (27) from the converter (1) in such a way that the tapped off part of the engine power passes through the torque converter (1). |
