Stepless friction drive

Infinitely variable friction wheel transmission with:

• a housing,
• an input shaft,
• a torque shaft arranged coaxially thereto,
• two input discs with toroidally shaped inside surfaces, arranged coaxially with the input shaft,
• two output discs with toroidally shaped inside surfaces, arranged coaxially with the input shaft,
• such that in each case one input disc and one output disc form a pair and the two output discs are arranged in mirror symmetry and adjacent to one another,
• several friction wheels arranged between the inside surfaces of the pairs of input and output discs and able to swivel, in order to transfer a torque from the input disc to the associated output disc,
• a support for each friction wheel,
• a swivelling device for the supports of the friction wheels,
• a pressure device for one of the input discs, in order to push it in the direction of the output discs,
• an output shaft, and
• a gearwheel arrangement between the output discs and the input shaft, characterized in that between the lower end of each support (1) for the friction wheels (2) and the hydraulic piston (6) there is provided a compensation arrangement which consists of an upper bearing shell (3), a lower bearing shell (5), a cage (9) and balls (4) inserted in the cage and between the two bearing shells, and a traction element (7) which adjustably connects the bottom end of the support (1) to the hydraulic piston (6) and passes through the middle of the compensation arrangement.