To simplify the structure, suppress the increase of weight, to be manufactured inexpensively, eliminate a need for manual speed change switching operation, and perform automatic speed change only by the pedaling force of a pedal without using an auxiliary power.
In a power transmission system to transmit a rotational power, exerted on a crank pedal shaft 5, to a rear wheel 7, a torque-sensitive type automatic belt type continuously variable transmission 8 is provided in such a manner that in a normal state, the power of a crank pedal shaft 5 is transmitted in an accelerating position to the rear wheel 7 side and meanwhile, when, during ascending a slope, torque transmitted from the crank pedal shaft 5 side exceeds set torque, and automatic shift down to a deceleration position is effected and a deceleration ratio is increased.
| WO/2016/052431 | VEHICLE |
| WO/2003/084807 | SEPARABLE BICYCLE |
| JPS6112479 | SADDLING TYPE REAR PLURAL-WHEEL AUTOMOBILE |
SHIRATO JIRO
YANAGIUCHI SUSUMU
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