bicycle gear shifting system

Abstract

The present invention relates to a gear shift system for a bicycle and, more specifically, to a gear shift system capable of shifting gears of the bicycle through a motor driven method which can use the existing chain gear shift for a bicycle. The gear shift system comprises: a chain gear shift including a rear gear shift controller and a front gear shift controller, with the rear gear shift controller being mounted on the seat stay or chain stay on one side of at least one sprocket of a bicycle and used for controlling a rear chain gear shift which shifts the position of the chain held on one of the at least one sprocket connected to the rear wheel shaft of the bicycle, and the front gear shift controller being used for controlling a front chain gear shift which shifts the position of the chain held on at least one chain ring connected to the pedal shaft of the bicycle; a shift switch for generating a gear shift signal for the chain gear shift; a signal distributer for transmitting a driving signal between the chain gear shift and the shift switch; a battery for driving the chain gear shift; a rear gear shift wire for connecting the rear chain gear shift and the rear gear shift controller; a front gear shift wire for connecting the front chain gear shift and the front gear shift controller; and a power line for connecting the chain gear shift, the shift switch, the battery, and the signal distributer to each other.

Description

technical field [0001] The present invention relates to a transmission device for a bicycle, and in particular to a transmission system for a bicycle, which can electrically change the speed of a bicycle even if it directly uses an existing chain transmission (derailleur). Background technique [0002] Currently, the number of people going on vacation in Korea using bicycles such as leisure bicycles that can travel not only on the four major rivers but also on mountains is increasing. [0003] The driving device for the bicycle includes a chain that transmits power between a chainring fixed to a pedal shaft of a conventional bicycle and a sprocket, the sprocket It is fixedly arranged on the rear wheel axle of the bicycle. [0004] At this time, each of the sprocket and sprocket may include gears of various sizes having more than one gear ratio. Thus, the bicycle can be shifted by adjusting the position of more than one chain hanging on the sprocket and sprocket. [0005] ...

AI Technical Summary

Problems solved by technology

[0011] In addition, the chain derailleur requires a very complicated process for setting such as fine-tuning work, which requires fine-tuning the tension of the wire member and adjusting the transfer range of the derailleur.

[0012] In addition, when the bicycle is used, the cable member may be stretched, and the installation of the shifting device may be distorted due to the impact applied to the bicycle, so that there is a high possibility of a shifting failure such as that the shifting cannot be performed smoothly.

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