The invention belongs to the field of electric bicycle accessories, and particularly relates to a telescopic crank of an electric bicycle, which utilizes the space on the other side of the crank, so that the radius length of the telescopic crank taking a middle shaft as a circle center after the telescopic crank is contracted is shorter than the total length of a short crank of the electric bicycle, and the total length of the crank is longer after a lower crank extends out. When the electric bicycle is driven by electricity, the lower crank can be retracted into the upper crank, so that the length of the crank meets the safety requirement, accidents caused by the fact that the crank is hung on the ground due to large turning in the running process are avoided, and the lower crank can be drawn out to enable the length of the lower crank to be as long as two feet of an adult to straddle away for riding when the electric bicycle is manually ridden. The bicycle can completely exert force, is not prone to fatigue, and can be ridden quickly. The device is simple in structure, convenient to operate, high in bearing capacity, low in cost and high in economical efficiency.
本发明属于电动自行车配件领域,尤其涉及一种电动自行车伸缩曲柄,本伸缩曲柄利用曲柄的另一侧的空间,使本伸缩曲柄在收缩之后以中轴为圆心的半径长度比电动自行车的短曲柄的总长更短,下曲柄伸出之后曲柄的总长度更长。电动自行车在用电驱动的时候,可以把下曲柄缩进到上曲柄里面,使曲柄的长度符合安全要求,不会在行驶过程中因大转弯而挂住地面造成事故,人力骑行的时候可以抽出下曲柄使下曲柄的长度尽量附合成年人两脚跨开骑行,而能完全使出力,又不容易疲劳,而且还骑得快的作用。本发明结构简单,操作便捷,承力能力强,成本低经济性高。
Telescopic crank of electric bicycle
一种电动自行车伸缩曲柄
2023-12-05
Patent
Electronic Resource
Chinese
IPC: | B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer |
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