AUTOMATIC TRANSMISSION

PROBLEM TO BE SOLVED: To provide an automatic transmission which properly reduces the size of a component such as a sun gear of a planetary gear mechanism while avoiding a malfunction such as the complication of a structure, and thereby is suitably reducible in the size and weight of the transmission as a whole.SOLUTION: An automatic transmission A comprises: a first clutch C1 which is disposed in a position at an input side rather than a planetary gear mechanism P, and drive-connected to a first sun gear S1 via a first hollow shaft 3a; a second clutch C2 which is disposed in a position at an output side rather than the planetary gear mechanism P, and drive-connected to a carrier CR; and a third clutch C3 which is drive-connected to a second sun gear S2 via a second hollow shaft 3b. The third clutch C3 is disposed in a position at an output side rather than the planetary gear mechanism P, and the second hollow shaft 3b is displaced in position from the first hollow shaft 3a in an axial length direction of an input shaft 1. 【課題】構造の複雑化などの不具合を回避しつつ、遊星歯車機構のサンギヤなどの構成部品の小型化を適切に図り、もって全体の小型・軽量化などをも好適に図ることが可能な自動変速機を提供する。【解決手段】遊星歯車機構Ｐよりも入力側の位置に設けられ、かつ第１中空軸３ａを介して第１サンギヤＳ１に駆動連結された第１クラッチＣ１と、遊星歯車機構Ｐよりも出力側の位置に設けられてキャリヤＣＲに駆動連結された第２クラッチＣ２と、第２中空軸３ｂを介して第２サンギヤＳ２に駆動連結された第３クラッチＣ３と、を備えている、自動変速機Ａであって、第３クラッチＣ３は、遊星歯車機構Ｐよりも出力側の位置に設けられ、第２中空軸３ｂは、入力軸１の軸長方向において第１中空軸３ａとは位置ずれしている。【選択図】 図１