Revolving join is maddening that plastic of nanometer technique coat, in order to reduce the coefficient of friction for increased efficiency.
转动副采用纳米塑料薄层，减小摩擦系数，提高效率。
The efficiency of a real system is always less than 1 because of friction between moving parts.
由于运动部件之间存在摩擦力，所以实际系统的效率永远小于1。
This article discusses the effects of friction coefficient fon the engagement efficiency of involute cylindrical gears and the bending stress of the dedendum.
本文讨论了摩擦系数对渐开线圆柱齿轮传动啮合效率和齿根弯曲应力的影响。
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