Patent ID: 6487936
Filing Date: 2002-12-03
Classification: B62M,Y10T

Abstract:
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.