The invention discloses an automatic gear shifting device for a rear wheel of a bicycle. The device comprises a shell; a gear shifting cavity is formed in the shell; a rear wheel shaft is rotationallyarranged on the rear end wall of the gear shifting cavity; a fourth-stage chain wheel, a third-stage chain wheel, a second-stage chain wheel and a first-stage chain wheel are fixedly arranged on therear wheel shaft; a rotating shaft is rotationally arranged on the front end wall of the gear shifting cavity; an internal tooth cam is fixedly arranged at the rear end of the rotating shaft; an innertooth cavity with a backward opening is formed in the internal tooth cam. The device is simple in structure and simple in control; a rider steps on a pedal in the reverse direction and the forward direction in the riding process, and gear shifting operation can be achieved through a series of mechanical transmission; other power sources do not exist; the environmental protection requirement is met; gear shifting operation can be conducted according to the riding requirement of the rider in the riding process, the flexibility is high, automatic gear shifting can be conducted in the uphill process, and the riding difficulty is reduced.

    本发明公开了一种自行车后轮的自动换档装置,包括壳体,所述壳体内设有换档腔,所述换档腔后端壁上转动设有后轮轴,所述后轮轴上固定设有四级链轮、三级链轮、二级链轮和一级链轮,所述换档腔前端壁上转动设有转动轴,所述转动轴后端固定设有内齿凸轮,所述内齿凸轮内设有开口向后的内齿腔,本发明结构简单,控制简便,骑行者在骑行过程中进行反向正向踩踏板,即可通过一系列的机械传动,实现换档的操作,没有其他动力源,符合环保要求,在骑行过程中可根据骑行者对于骑行的要求来进行换档操作,灵活性较高,还能在上坡过程中自动换档,减少骑行难度。


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    Title :

    Automatic gear shifting device of rear wheel of bicycle


    Additional title:

    一种自行车后轮的自动换档装置


    Contributors:

    Publication date :

    2020-10-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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