Automotive five-speed automatic gearbox has transmission control unit

摘要

A drive train for a five-gear automatic gearbox has a first planetary gear unit (4) and a second planetary gear (6). The first planetary gear (4) has a first and a second set of simple planetary gears (8, 10), with a first, second, third and fourth drive elements (A, B, C, D). The second planetary gear (6) has third and a fourth sets of ) with a fifth, sixth, seventh and eighth drive element (G, H, I, J). The fifth drive element (G) operates as a drive output, and the first drive element (A) operates as a drive input element. The fifth and the sixth drive elements (G, H) are variably linked with the second element (B). The seventh element (I) is invariable linked with the fourth drive element (D). Clutches (42, 44) form a variable link between the fifth and the sixth elements (G, H) and the second elements (B). Brakes (48, 50) are located between the fourth and the eighth drive element (D, J) and the gearbox housing (46).