| 摘要 |
PROBLEM TO BE SOLVED: To reduce a shaft directional dimension and a radial directional dimension of an automatic transmission, and to sufficiently lubricate frictional engaging elements. SOLUTION: This automatic transmission has the first frictional engaging element, the second frictional engaging element, a rotatably arranged hydraulic servo drum for constituting a hydraulic servo C-3 for engaging and disengaging the first frictional engaging element, and a hub for supporting a friction member 67 of the second frictional engaging element. The hydraulic servo drum has an outer peripheral wall 42, an inner peripheral wall 43 and a bottom wall 44. The hub is formed in a prescribed position of an inner diameter from the outer peripheral wall 42 in the radial direction of the bottom wall 44 by superposing at least a part on the inner peripheral wall 43 in the shaft direction. In this case, since the hub is formed by superposing at least a part on the inner peripheral wall 43 in the shaft direction, the shaft directional dimension of the automatic transmission 11 can be reduced.
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