Patent ID: 6558286
Filing Date: 2003-05-06
Classification: F16H

Abstract:
A continuously variable transmission comprising a planetary friction variable-speed drive consisting of central inner and outer friction discs arranged, respectively, on a central shaft and on an epicycle and laterally embracing intermediate friction discs, a mechanism for combined modification of the transmission ratio and of the pressure made in the form of rotating levers carrying the intermediate friction discs and arranged on a planetary variable-speed drive carrier, which is connected to a low-speed shaft, with the possibility of changing the position of the rotating levers, characterized in that the mechanism for combined modification of the transmission ratio and of the pressure is provided with power members applying an axial action, which are arranged on end sides of all the said central friction discs so as to ensure the contact of the said members in annular areas of the central friction discs, said areas being opposite to annular areas of contact between the said friction discs and the intermediate friction discs, the average axial rigidity of the power members applying an axial action, which are brought into contact with the central outer friction discs, being made so as to be higher, in terms of absolute value, than the average rigidity of the power members applying an axial action, which are brought into contact with the central inner friction discs.