TRANSMISSION SYSTEM COMPRISING PLANETARY GEARS

摘要

The invention relates to a transmission system comprising planetary gears. The inventive system comprises: an input element, an output element which is coaxial to the input element, two planetary gear trains (4, 5), clutches for obtaining a plurality of transmission ratios, and a speed-increasing planetary gear train (6) for obtaining at least one additional speed. According to the invention, each clutch acts between (i) one element of one of the planetary gear trains and (ii) the earth element, the input element, the output element or another element of the planetary gear trains. Moreover, each planetary gear train comprises a sun gear and planet gears which are supported by a planet carrier. In addition, the speed-increasing gear train (6) comprises a plurality of stepped planet gears (21, 22).