Regie Nationale Des Usines Renault

Jean Piret

Andre Lalin

Michel Jallas

A transmission with a variator, notably for automotive vehicles, is disclosed. The transmission is constituted by a variator which can be disconnected by engaging a constant-ratio direct drive. The engagement system is an either-or device.

Transmission with variator

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.

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Boulogne-Billancourt, France

Jean Piret