Transmission and control with hydraulically actuated synchronizers

摘要

A countershaft type power transmission has a plurality of hydraulically actuated synchronizers which are selectively operable to establish the gear ratios in the transmission. Each synchronizer is effective to control one or more ratios and is positionable between neutral positions. A hydraulic control system is provided to control the movement of the synchronizers and to hydraulically force each synchronizer to neutral when it is not called upon for ratio establishment.