Outer speed change mechanism of electric bicycle

Abstract

The invention relates to an outer speed change mechanism of an electric bicycle. The outer speed change mechanism of the electric bicycle mainly adopts the structure that a one-way device is arranged between a large fluted disc and a crank shaft; the one-way device is driven by cranks to drive the large fluted disc to perform unidirectional rotation so as to enable a rear wheel, the larger fluted disc and a chain to keep rotation at the same rotational speed; besides, a sensing device is used for sensing the size of the rotating speed of the real wheel, the large fluted disc or the chain; and once the rotating speed is too low, an electronic derailleur stops move, during which a rider can not realize gear shift by using a manual control method or an automatic control method, so as to ensure that a shift cable can remain in a appropriate tightness, and avoid the situation of chain falling at the same time.

Description

technical field [0001] The invention relates to an electric bicycle, in particular to an external speed change mechanism of an electric bicycle. Background technique [0002] The speed change mechanism of the bicycle can be divided into two types: internal speed change and external speed change. Simply put, the internal speed change mechanism is hidden inside the rear hub and will not come into contact with the outside mud or rainwater, so it does not need regular maintenance, but due to the limited installation space , the speed change range will be limited; the external speed change mechanism will directly contact with the outside soil or rainwater, so it must be cleaned and maintained regularly, but because the external installation space is large, the speed change range will be relatively large. [0003] As far as the known external transmission mechanism is concerned, if the rider performs a forced shift action when the large chainring stops rotating or the speed is too...

AI Technical Summary

Problems solved by technology

[0002] The speed change mechanism of the bicycle can be divided into two types: internal speed change and external speed change. Simply put, the internal speed change mechanism is hidden inside the rear hub and will not come into contact with the outside mud or rainwater, so it does not need regular maintenance, but due to the limited installation space , the shifting range will be limited; the external shifting mechanism will be in direct contact with the outside soil or rainwater, so it must be cleaned and maintained regularly, but due to the large external installation space, the shifting range will be relatively large

[0003] As far as the known external transmission mechanism is concerned, if the rider performs a forced shift action when the large chainring stops rotating or the speed is too low, it is easy to make the transmission cable appear tense and affect the service life of the transmission cable. Moreover, if the rider steps on it again at this time, it is also easy to drop the chain.

Therefore, the rider must pay attention to the rotation speed of the large chainring to change gears during the riding process, which is quite inconvenient in operation.

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