SPEED CHANGE DEVICE

摘要

The present invention relates to a transmission apparatus using a gear combination having a backspin prevention means, which comprises a gear combination (500) having a gear ratio by combination of a planetary gear (50) having three rotation parts, of which any two rotation parts are used as driving input rotation parts (DA', DP'), and the rest one rotation part is used as a driving power rotation part (DB'), at least one first driving input shaft (10) in which a first rotary power (P1) is delivered, and at least one second driving input shaft (10') in which a second rotary power (P2) is delivered; and a backspin prevention means blocking and unblocking each rotary power on the shaft of the first driving input shaft (10) and the second driving input shaft (10'). The transmission apparatus using a gear combination of the present invention has an effect of preventing skid when starting after stop or in a slop by further including a brake means such as a one-way bearing or a clutch in addition to the gear combination to force the rotation of a power delivery shaft to stop when a backspin power occurs in a slope.