Toroidal Gearbox With A Hydraulic Pressure Device

A toroidal gearbox in which an annular central disc with a toroidal friction surface and an annular main cylinder of a hydraulic pressure device are located concentrically to a central shaft. A radial partition wall is provided between the central disc and the main cylinder to form two working pressure chambers, the pressurization of which results in axial displacement of the central disc relative to the central shaft to apply contact pressure forces on the friction surface. A pressure piston between the partition wall and the main cylinder having an axial projection effectively bypasses the partition wall and acts on the central disc, in addition to the pressure applied in the pressure chamber between the partition wall and the central disk, thereby achieving an even distribution of the operating force in the circumferential direction, as exerted on the central disc, by the pressure piston.