There is no spring pressure on the clutch assembly parts. So there is no friction between the driving members and driven members.
离合器主动件、从动件上没有弹簧作用力，因此主动件和从动件之间也没有摩擦力。
Because the inner space of a hollow track is small, a driving wheel is arranged outside the hollow track in the prior art, and a dolly is driven to move by friction force generated by spring force.
由于空腹轨道内空间小，驱动轮安装在空腹轨道外部，靠弹簧力产生的摩擦力带动小车运行。
In order to minimize the friction occurring between the push button and the driving part when relatively rotated forces are transmitted via a pivot bearing (18, 22).
为了减小在按钮和驱动部件相对转动时产生的摩擦力，力通过枢轴轴承(18,22)被传递。
The friction coefficient between driving drum and belt is about 0.25, while the friction coefficient between bionic driving drum and belt is over 0.32.
普通传动滚筒与胶带之间的摩擦系数一般为0.25，而这两种仿生传动滚筒与胶带之间的摩擦系数都在0.32以上。
But as experiment time increases, the effect of increasing friction for driving drum with concave covering-layer is decreased, and much lower than the driving drum with convexity covering-layer.
但是凹坑形仿生非光滑传动滚筒随着实验时间的增长，其增摩效果受到一定的影响，效果不如凸包形仿生非光滑传动滚筒。
But as experiment time increases, the effect of increasing friction for driving drum with concave covering-layer is decreased, and much lower than the driving drum with convexity covering-layer.
但是凹坑形仿生非光滑传动滚筒随着实验时间的增长，其增摩效果受到一定的影响，效果不如凸包形仿生非光滑传动滚筒。
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