Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units.
The difference of the lengths of the two chains produces a differential action to damp the reverse inertia impact of the counterbalance weight.
两组链条长度之差产生差动功能，可缓冲平衡重的换向惯性冲击。
3
The paper adopted the new calculated mode to establish the Differential Equation of the Retaining Wall Displacement including the wall weight as one term in the Equation.