By investigating the relations of hardness difference to wear rate, the best friction pair mate was ascertained.
研究了配副硬度差与磨损率的关系，根据这种关系确定了最佳配副组合。
In the design of disc brake system, it is very important to choose the friction coefficient of brake pair.
制动副摩擦系数的选取，对盘式刹车系统的设计至关重要。
This paper introduces systematically the method for measuring the instantaneous friction force of cylinder liner-piston pair in the engine.
系统地阐述了发动机缸套活塞组瞬态摩擦力的测量方法。
The joint of this chain is composed of a rolling pair, so that the friction is lower.
这种链条的铰链由滚动副组成，具有减磨、耐磨性能。
They are used to input or output the power through the friction and a pair of helical gears is also used to adjust the speed, so the speed can change between 0.75 and 1.22.
该装置通过八个钢球利用摩擦力将动力进行输入输出，用一对斜齿轮进行分度调速，从而使自行车在0.75～1.22之间进行无级调速。
They are used to input or output the power through the friction and a pair of helical gears is also used to adjust the speed, so the speed can change between 0.75 and 1.22.
该装置通过八个钢球利用摩擦力将动力进行输入输出，用一对斜齿轮进行分度调速，从而使自行车在0.75～1.22之间进行无级调速。
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