损伤状态：当在安装和使用这种搬迁到滚道和滚动表面轴向线性造成的创伤。
Damage state: when in the installation and removal of such use to the raceway and the rolling surface wounds caused by the axial linear.
钢轨必须为车轮提供连续、平顺和阻力最小的滚动表面，还应提供较好的粘着牵引力。
Rail must provide continuous, smooth, least resistance of rolling surfaces and good adhesion of traction to the train wheels.
水泵轴连轴承失效形式主要为：心轴断裂，心轴滚动表面、外圈沟(滚)道表面、滚动体表面的磨损和疲劳剥落及密封失效。
Main failure modes of automobile water pump bearings are: breakage of shaft, wear and fatigue flaking of rolling contact surfaces.
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