Automatic switching device of a change-speed the circulation wheels design with a by hydraulic actuation engageable frictional switching means (the coupling or brake)

摘要

in an automatic schaltvorrichtung for activating a reibschlu00fcssigen schaltmittels (clutch or brake) by a schaltstellglied are a schaltventil for the working pressure of the schaltstellgliedes, a stationary state of the schaltmittels dependent wechselsteuerventil and an electronic control unit ansteuerbares umschaltsteuerventil so connected.that in the event of a control unit or the power supply of the schaltmittel in his current steady state remains actuated.