当牵引角度不变时，随牵引力的增大，颈椎的位移及各点的应力均增大，椎间隙的形变亦更明显。
When the traction Angle was constant, the displacement and stress of the cervical column as well as the deformation of intervertebral space were all increased with the enhancing of traction force.
随着轮齿高度的增加，挂钩牵引力会随之增大，车轮的最大牵引效率有所降低；
The results show that when increasing the wheel load, drawbar pull accordingly increase and the tractive efficiency show downtrend before uptrend.
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