| 摘要 |
PURPOSE:To widen the width of change gear ratio in both the lowest speed change stage and the highest speed change stage by constituting so that the speed change of forward six stages and backward one stage at maximum can be enabled by using two pairs of double pinion type planetary gear mechanisms. CONSTITUTION:The forward first speed in which the change gear ratio is largest can be obtained by connecting a sun gear 3 in a first planetary gear mechanism 1 to an input member, and further fixing both the carrier 11 in the first planetary gear mechanism 1 and the sun gear 4 in a second planetary gear mechanism 2. And when both the carrier 11 and a ring gear 5 in the first planetary gear mechanism 1 are connected to the input member, since the whole rotates integrally, the forward fifth speed in which the change gear ratio is 1 can be obtained. Meanwhile, when the ring gear 5 in the first planetary gear mechanism 1 or a carrier 12 in the second planetary gear mechanism 2 is connected to the input member, and further the sun gear 4 is fixed, the overdrive stage in which change gear ratio is less than 1 can be obtained. On the other hand, when the sun gear 3 in the gear mechanism 1 is connected to the input member and further both the ring gear 5 in the gear mechanism 1 and the carrier 12 in the gear mechanism 2 are fixed, the backward stage can be obtained.
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