The invention discloses a center shaft bowl group structure for an electric bicycle.Two limiting flanges are arranged on a center shaft, and the outer side faces of the limiting flanges are of arc-shaped concave face structures. The inner edges of the outer end faces of a first shaft sleeve and a second shaft sleeve are of arc-shaped convex face structures, the middle shaft is sleeved with the two shaft sleeves which are located in the forward tooth bowl installation cavity and the reverse tooth bowl installation cavity respectively, and the arc-shaped convex faces of the two shaft sleeves make contact with the arc-shaped concave faces on the outer side of the limiting flanges on the middle shaft and are matched with the arc-shaped concave faces in a sliding contact mode. An elastic buffering piece is located at the inner end of the first shaft sleeve and/or the second shaft sleeve. Due to the fact that the shaft sleeves and the limiting flanges of the center shaft are in sliding fit with a large contact surface, certain friction resistance can be generated when the shaft sleeves and the limiting flanges of the center shaft rotate relatively, and due to the existence of the elastic buffering piece, the effect of automatic displacement compensation of friction loss of the shaft sleeves can be achieved, and generated friction force attenuation is slow, so that the problem that the motor of the electric bicycle drives a flywheel to rotate and drives a center shaft crank to rotate together is solved.
本发明公开了一种电动自行车用中轴碗组结构,在中轴上设置有两个限位凸缘,限位凸缘的外侧面为弧形凹面结构;第一轴套和第二轴套的外端面的內缘为弧形凸面结构,两个轴套套装在中轴上并分别位于正牙碗和反牙碗安装腔中,并且两个轴套的弧形凸面与中轴上的限位凸缘的外侧的弧形凹面接触,二者为滑动接触配合;弹性缓冲件位于第一轴套和/或第二轴套的内端。由于轴套和中轴的限位凸缘之间是接触面较大的滑动配合,二者发生相对转动时会产生一定的摩擦阻力,并且由于弹性缓冲件的存在,会起到轴套摩擦损耗自动位移补偿的作用,使产生的摩擦力衰减较慢,从而解决了电动自行车电机带动飞轮旋转并带动中轴曲柄一同旋转的问题。
Center shaft bowl group structure for electric bicycle
电动自行车用中轴碗组结构
2021-08-03
Patent
Electronic Resource
Chinese
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