Four-point contact ball earings used for rolling mill roll the oil tank to withstand the axial load.
四点接触球轴承多用于轧钢机的油辊箱以承受轴向负荷。
When under the same axle load, if the wheel rolling speed gets higher, the adhesion coefficient declines as the ratio of the mean asperities contact pressure to the total pressure becomes smaller.
研究发现：相同轴重下，滚动速度越大，粗糙峰接触压力与总压力的比值越小，导致轮轨之间的粘着系数下降；
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