When the bearing is carrying load,material fatigue shall happen even under normal operating

conditions due to the effects of changing load on the raceways of rings and the sliding surface of

the rolling elements,and if will canse scaling damage on of rings and the sliding surface of the

rolling element, and it will cause scaling damage to the raceways and the sliding surface (called

flaking or spalling).

      The total number of revolutions before such scaling happeas is called the"(Fatigue) life " of

the bearing.

      The bearing (fatigue) life varies greatly even for those with the same structure, dimensions.

materials and manufacturing processes under the same rotation conditions.

       Because the material fatigue is of diversity, it must be considered statistically.

       Suppose a number of bearings of the same specification are operated individually under the

same working conditions.After a certain . period of tine. 10% of the fail as a result of flaking

caused by rolling fatigue .In this case, the total number of revolutions is defined as the fatigue life

rating.

        When the bearings rotate at constant speed, its life can also be expressed with total rotation time.

       In fact. however,other damage or impair may happen besides fatigue scating.

      The damage or impair may be avoided by choosing the correct bearing. mounting method

and lubrication.

WaFangDian Pengli Bearing Manufaturing Co.,ltd

Sales Departmert: Frank  zhang

Tel:0086-0411-85589390       Email:frank@wplbearing.com