Variable speed controller for bicycle

Abstract

To automatically shift gears using a shift control unit for a bicycle without requiring complex operations concerning a power supply. A shift control unit 12 for a bicycle is mounted in the bicycle fitted with an AC generator 19 and an internal shift hub 10 having a plurality of gears, is used for controlling the hub to either of the plurality of gears, and includes a capacitor 32, a shift control part 25 and a lamp case. The capacitor 32 can store electric power coming from the AC generator 19. The shift control part 25 operates on the power stored in the capacitor 32 and controls the hub to either of the plurality of gears according to an AC signal from the AC generator 19. The lamp case holds the capacitor 32 and the shift control part 25 and can be mounted to a bicycle frame or handle.

Description

technical field [0001] The present invention relates to a speed change control device, in particular, to a bicycle mounted with an alternator and a speed change device having a plurality of speed change stages, and controlling the speed change device so as to be in any one of the plural speed change stages. Gearbox for bicycles. Background technique [0002] The transmission of a bicycle generally has a built-in transmission built into the hub of the rear wheel, and has a multi-stage sprocket mounted on the hub or crank of the rear wheel and a derailleur that can hang the chain around any sprocket. External transmission. No matter what kind of speed change device, all have a plurality of shifting stages, in the past, from the shifting operation part that is loaded on the bicycle frame, operate by the shifting cable, to switch to any stage of a plurality of shifting stages. [0003] Recently, an automatic shifting unit has been developed that uses an electric motor to move ...

AI Technical Summary

Problems solved by technology

For this reason, the maximum error between the detected vehicle speed and the actual vehicle speed is about one revolution of the wheel, resulting in a lag in response, and the speed change control cannot be performed with high precision.

[0006] In addition, the sensor for vehicle speed detection is installed in the case, so the speed change control device must be installed near the wheels, and the installation position of the device is limited.

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