DERAILLEUR FOR ELECTRIC BICYCLE
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United States of America Patent
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N/A
Issued Date -
Dec 27, 2012
app pub date -
Jun 22, 2012
filing date -
Jun 23, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A derailleur for an electric bicycle is composed of a control unit, a gearshift drive unit, and a gearshift cable connected with the gearshift drive unit and the control unit. The gearshift traction (F1) required by the gearshift controller, the output torsion (T) of the gearshift drive unit, the radius (R) of the reel, and a bend radius of the gearshift cable, and the bend radius r of the gearshift cable satisfy the formula r≦R≦(T/F1). In this way, when the gearshift drive unit can drive the control unit for gearshift, figure out the minimum bend radius of the gearshift cable, so that the need for electricity can be reduced and the applicable electric motor can be adopted to enable the derailleur to be lightweight.
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