Compared to the new wheel tread, the worn tread is easy to form two-pointcontact nearby the depression area of the nominal diameter position of wheel tread.
与新用车轮踏面相比，测试得到的磨耗后车轮踏面在其名义直径位置凹陷区域附近容易形成踏面两点接触。
2
The quality of this transition is best visualized by a straight line drawn between two circles: the line's only point of contact with each circle is tangential.
In small tooth difference of inner meshed transmission, there were a few pairs of tooth faces which were apart from each other for a small gap beside the contactpoint generated by two meshed teeth.