US 2002/0173397 A1Published application

Auxiliary-bicycle torsion sensing and large gear plate minimization apparatus

AssigneeIndustrial Technology Research Institute

InventorsChing-Huei Wu, Ching-Wen Liu, Chung-Ping Chiang, Cheng-Chung Yen, Chih-Ming Liang

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Abstract

An auxiliary-bicycle torsion sensing and large gear plate minimization apparatus, arranged in transmission apparatus of an auxiliary-bicycle, includes a sun gear, a unidirectional device, a planet gear set and a sensing device. The sun gear of planet gear set is connected to the crank axle of auxiliary-bicycle and driven directly with it. The stepping power of crank axle is output to the large gear plate of auxiliary-bicycle through the transmission of sun gear, planet gear and unidirectional device. Also, one side of swing arm, used for pivotally arranging sun gear and planet gear, is arranged with the sensing device. When crank axle is rotated by the stepping force of rider, the swing arm will generate a rotation torsion, and sensing device senses the torsion value to control the power output of driving motor. The present invention has the characteristics of simple structure, low manufacture cost, more accurate sensitivity, and further instant changeable rotation ratio between crank axle and large gear plate to meet the object of broader application, such as the outlook beautification due to the minimization of large gear plate.

Claims10

Dependent claims

An auxiliary-bicycle torsion sensing and large gear plate minimization apparatus, said apparatus being engaged with a transmission apparatus of auxiliary-bicycle, said transmission apparatus comprising at least a crank axle, a gear plate and a speed-variation gear set;

by rotating the crank axle, power output of a driving apparatus of said auxiliary-bicycle can be controlled;
the power output driving the gear plate to rotate through the transmission of transmission apparatus;
said auxiliary-bicycle torsion sensing and large gear plate minimization apparatus comprising:
a sun gear, which is fixed to the crank axle and driven together with it to rotate;
a planet gear set, which at least includes a swing arm and a first planet gear;
the swing arm pivotally engaged with the crank axle and is capable of rotating about the crank axle in a limited degree;
the first planet gear is pivotally engaged with the swing arm and driven together with the sun gear to rotate;
the first planet gear is driven to rotate by the rotation of crank axle and further make the swing arm generating a rotation torsion in the same rotation direction which is same as that of sun gear;
and
a sensing apparatus, which contacts with one side of the swing arm and may sense the rotation torsion of the swing arm, and generates a sensing signal to control the power output of driving apparatus.

7 more elements

Dependencies are inferred from the claim text.