Multistage automatic planetary transmission gearing

In an automatic planetary gear transmission comprising a driving shaft, a driven shaft, and at least one gearing stage, the improvement wherein each stage has a planetary gearing unit and a centrifugal gear change clutch, each unit comprising an input gear, an output gear, a planetary gear meshing with the input gear and the output gear, and a rotatable carrier for the planetary gear, the centrifugal gear change clutch being connected between the carrier and the output gear, the centrifugal gear change clutch being so constructed and arranged as to decrease the difference in speed between the carrier and the output gear upon an increase in speed of rotation of the output gear, and means to increase the difference in speed between the carrier and the output gear upon the subjection of the output gear to an increase in its driving torque, the centrifugal gear change clutch comprising a drum fixedly connected to the output gear, the drum being provided with a mechanism for feedback coupling, said mechanism comprising an output part, a movable regulating part, and a rest stop for the regulating part, the output part comprising carrier arms transmitting power from said stage, and swinging carriers pivotally mounted on the drum, the swinging carriers having output arms and guiding arms, the output arms having contact faces engaging the carrier arms, the regulating part comprising centrifugal weights guided by the guiding arms of the swinging carriers, a controlled disc with seats receiving the weights, each seat having an inclined surface, and a return spring, said return spring clamping the centrifugal weights between the inclined surface of the controlled disc and the drum of the gear change clutch.