Through changes the driving gear and the driven wheel transmission belt's contact radius carries on the speed change.

通过改变驱动轮与从动轮传动带的接触半径进行变速。

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Curves generally are ground with asymmetric profiles that promote conformal contact in order to take advantage of the rolling radius difference and enhance steering.

在曲线处的内轨和外轨通常打磨成不对称的形状，目的是改善共形接触，增大内外车轮滚动圆的直径差，利于导向。

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Based on the analysis of geometry parameters and contact stresses of the deep groove ball bearings, the control equation of groove curvature radius has been drawn out.

在对深沟球轴承几何参数及接触应力分析的基础上，给出了沟曲率半径系数的控制方程，并对轻、中、重系列轴承的外圈沟曲率半径系数的选取进行了探讨。

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It was revealed that the radius and contact angle of the legs mainly accounted for the large supporting force, ensuring that the robotic water strider not only stood but also walked on the water surface.

FORBES: A Robot That Walks On Water