在一定载荷作用下，轴承在出现点蚀前所经历的转数或小时数，称为轴承寿命。
Under certain loads, the number of rotations or hours that a bearing experiences before pitting corrosion is called bearing life.
滚动轴承之寿命以转数（或以一定转速下的工作的小时数）定义：在此寿命以内的轴承，应在其任何轴承圈或滚动体上发生初步疲劳损坏（剥落或缺损）。然而无论在实验室试验或在实际使用中，都可明显的看到，在同样的工作条件下的外观相同轴承，实际寿命大不相同。此外还有数种不同定义的轴承“寿命”，其中之一即所谓的“工作寿命”，它表示某一轴承在损坏之前可达到的实际寿命是由磨损、损坏通常并非由疲劳所致，而是由磨损、腐蚀、密封损坏等原因造成。
The life of a rolling bearing is defined by the number of rotations (or hours of work at a given speed). Bearings within this life should suffer from initial fatigue damage (spalling or defect) on any bearing ring or rolling element. However, no matter in laboratory test or in actual use, it is obvious that the actual life of bearings with the same appearance under the same working conditions is quite different. In addition, there are several different definitions of bearing "life", one of which is the so-called "working life", which means that the actual life of a bearing before damage is caused by wear, damage is usually not caused by fatigue, but by wear, corrosion, seal damage and other reasons.
为确定轴承寿命的标准，把轴承寿命与可靠性联系起来。
In order to determine the standard of bearing life, bearing life and reliability are linked.
由于制造精度，材料均匀程度的差异，即使是同样材料，同样尺寸的同一批轴承，在同样的工作条件下使用，其寿命长短也不相同。若以统计寿命为1单位，最长的相对寿命为4单位，最短的为0.1-0.2单位，最长与最短寿命之比为20-40倍。90%的轴承不产生点蚀，所经历的转数或小时数称为轴承额定寿命

Because of the difference of manufacturing accuracy and material uniformity, even if the same material pvcguancai.89ix.comjinshuguan.89ix.comgaoyaguan.89ix.comtanceqi.89ix.comxguangji.89ix.com

jianceyii.89ix.comand the same size of the same batch of bearings are used under the same working conditions, their life is different. If the statistical life is 1 unit, the longest relative life is 4 units, the shortest is 0.1-0.2 units, and the ratio of longest to shortest life is 20-40 times. 90% of the bearings do not produce pitting corrosion, the number of rotations or hours experienced is called the rated life of bearings.