Abstract: In this paper, according to the theory of mechanical reliability, the fatigue life model for multi-row rolling bearings that bases upon contact fatigue strength and considers the effect of blased load on the life of rolling bearings is established. 3-722 four-row tapered roller bearing is taken as an example. Through contact fatigue test and field reliability test for it, the accuracy of the model is examined. Result shows that life value calculated by the model is better coincident with actual used life.

Key words: 多列轴承, 疲劳, 寿命