| 摘要 |
A speed change gear system of the type including an input shaft, an output shaft, three planetary gear sets each having a central sun gear, an ring gear, a set of planetary pinion gears meshingly connecting the sun gear with ring gear and a revolving carrier rotatably supporting the pinion gear, two clutches, and three brakes. The improved system provides four forward speeds including an overdrive shift and one reverse and comprises five integrally rotatable units formed by combining elements of three planetary gear sets, including a first integrally rotatable unit formed by the sun gear in the first planetary gear set, a second integral unit connectable with the input shaft through a first clutch and having the revolving carrier in the second planetary gear set, the intenal ring gear in the first planetary gear set and the sun gear in the third planetary gear set all operatively interconnected, a third integral unit connectable to the input shaft through a second clutch and formed by the sun gear in the second planetary gear set, a fourth integral unit including the ring gears in the second and third planetary gear sets which are operatively interconnected, and a fifth integral unit including revolving carriers in the first and third planetary gear sets operatively interconnected, wherein each of the brakes is provided for the respective second, third and fourth integral units.
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