| 摘要 |
PROBLEM TO BE SOLVED: To enable the planetary gear structure to which the width of the design and selection of the gear ratio in a Ravigneaux type planetary gear structure, and to thereby enhance the degree of freedom in the design and improvement of automatic speed change gear. SOLUTION: The epicyclic gear structure is provided with a first sun gear, a second sun gear, a short pinion meshing with one of the sun gears, a long pinion meshing with the other of the sun gears, a ring gear, and a carrier to which a pinion shaft rotatably supporting the short pinion and the long pinion respectively is attached. An enlarged diameter to extend at least a part of the carrier inner diameter is formed in the center axial line direction, along the inner peripheral face.
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