| 摘要 |
A first planetary gear unit is arranged to convert an input rotation from an input shaft to an output rotation whose speed is lower than that of the input rotation. A first unit including second and third planetary gear units is arranged between the first planetary gear unit and the output shaft. The first unit is arranged to provide, by managing the output rotation from the first planetary gear unit, the output shaft with seven types of rotation which respectively correspond to 6-forward speed and one reverse positions. A second unit is arranged between the first planetary gear unit and the first unit to manage a power transmission therebetween. One of the second and third planetary gear units is of a double ring type which comprises a sun gear powered by the first planetary gear unit, inside and outside ring gears concentrically disposed around the sun gear, pinions each being meshed with the sun gear and inside and outside ring gears, and a pinion carrier carrying the pinions. The pinion carrier is connected to the output shaft to rotate therewith.
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