Abstract: Rotary plate-carrier drum for multi-plate clutches or brakes comprising a bearing plate adapted to encompass a set of keys formed on the outer cylindrical periphery of the drum, the keys being separated by longitudinal slots engaged by the radial extensions of the internal plates and external plates, respectively, of a pair of coaxial clutches. This drum construction is intended more particularly for multi-plate clutches of planetary change-speed transmission mechanisms.

Abstract: Hydraulic control device for automatic change-speed transmissions, especially for motor vehicles, which comprises a fluid reservoir, a pump supplied from said reservoir, a main pressure regulation valve determining the line pressure of the device and supplied from said pump, a hydraulic circuit connected to said main pressure regulation valve and feeding a series of hydraulic receivers through an assembly of auxiliary regulation valves associated with time-lag means, respectively, one of said valves being supplied through a cut-off valve, said device further comprising at least one delivery conduit supplying fluid to a group of hydraulic elements mainly consisting of a flap valve and a gauged orifice connected in parallel.