| 摘要 |
Disclosed is a continuously variable transmission in which when a shaft torque is secured by the belt friction force generated by externally pressing a pulley, the disablement of transmission caused by a belt rolling-in phenomenon within a pulley resulting from instability of the friction force or the friction coefficient as the pressing force is applied, or the deterioration of efficiency caused by the short or surplus of the friction force of input and output pulleys in a big ratio area are overcome, as a consequence of which the stable friction transmission with high efficiency can be achieved without depending on the kind of belts such as a tension type or a compression type. According to the continuously variable transmission, an input operating unit comprising a pressing device for supplying to the input pulley the elastic force generated by compressing in series an elastic device by a compressing device and a driving source for variably pressing and controlling the input pulley according to a instruction of a controlling device controls the friction force of the input pulley by the variable pressing control for supplying the elastic force, as a consequence of which the shaft torque of the output pulley in the state that a V-belt is in a substantially non-pressing state is indirectly variably controlled via belt tension.
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