The invention relates to a bike with an assistor, in particular to a bicycle, tricycle or tetra-cycle with an assistor, comprising a frame, a rear axle, a front axle and a middle shaft.
本发明涉及一种具有助力装置的脚踏车，尤其是指具有助力 装置的自行车、三轮脚踏车或四轮脚踏车。
Two-way pressure has mounted on ball bearings between the shaft and two outer rings, in the middle ring and outer ring were added between the steel ball, able to withstand the two-way axial load.
双向压力球轴承有安装于轴上的中间圈和两个外圈，在中间圈与外圈之间分别加有钢球，能够承受双向轴向负荷。
The rotor part is composed of shaft, middle wheel and balancing drum etc.
转子部分由轴、中轮、平衡鼓等组成。
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