| 摘要 |
A geartrain for a five-speed automatic transmission includes first and second compound planetary gear units. The first compound planetary gear unit includes first and second simple planetary gearsets having first, second, third and fourth operating elements. The first operating element acts as an input element. The second compound planetary gear unit includes third and fourth simple planetary gearsets having fifth, sixth, seventh and eighth operating elements. The fifth operating element acts as an output element and the sixth and eighth operating elements are variably connected to the first and fourth operating elements, respectively. The seventh operating element is fixedly connected to the third operating element. Clutches are provided for variably connecting the sixth and eighth operating elements to the first and fourth operating elements, respectively. Brakes are provided for selectively connecting the second and eighth operating elements to a transmission housing.
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