Automatic power transmission with mechanism for establishing under-drive speed ratio and bearing structure therefor.

摘要

An automatic power transmission includes a clutch drum (1) integrally connected with an one-way clutch (RDCN O.W.C) is fixed to a support (5) secured on a transmission casing (K2) so that each one bearing (6,7) is required for supporting the clutch drum (1) and the one-way clutch. A sun gear (S3) is also supported by means of a single bearing (2) and is integrally formed with a spline (9a) which is loosely engageable with a spline (1a) of the clutch drum (1) so that the radial force may not act in the spline engagement while an engine output torque is transmitted therethrough.