Abstract: The invention is related to a rotational speed converter comprising shafts (1, 2) with bevelled gears fixed thereon, separate bevelled gears (3, 4) which cooperate with said gears fixed onto said shafts and are mounted on a separate shaft (5), a planetary gear (6) connected to said separate shaft, and at least one braking gear (7) acting on said planetary gear.
Abstract: A transfer torque control device for a rotational speed responsive type control coupling is provided for providing a desired variation of a transfer torque in response to a variation of a rotational speed differential. The control coupling has orifices for restricting fluid flow therethrough and for thereby producing a transfer torque between first and second axle shafts. The transfer torque control device controls the orifices in such a manner that the openings of the orifices are varied successively in response to variations of the rotational speed differential to obtain the desired torque transfer characteristic.