What is the Effect of Load and Speed on the Life of the Bearing?

If the load is too large (Pr>0.5Cr, or Pa>0.5Ca), it will produce harmful plastic deformation at the contact between rolling body and raceway, which will reduce the life of the bearing.

If the bearing running speed is too high, due to the centrifugal force, the contact load between the rolling body and outer ring increases, so that the life of the bearing is reduced.

Bearing users often ask the question, which has a greater impact on bearing life, the speed or load size? This question should not be generalized. The bearing life we usually refer to is the fatigue life, which is the total working time of the bearing before it reaches fatigue damage, which is the normal fatigue damage of the bearing. If the bearing load is too large, causing the bearing to produce harmful plastic deformation or stress concentration, the bearing will produce abnormal damage, while the speed is too high, the temperature rise is significantly higher, the slipping intensifies, it will make the bearing overheat or cage fracture and other early damage. Therefore, when it comes to the effect of speed and load on life, we can generally only use the concept of fatigue life. According to the bearing life calculation formula, the life is inversely proportional to the load, and linearly inversely proportional to the speed n. Therefore, in terms of fatigue life, the effect of load on bearing life is much greater than the effect of speed on it. Speed and life are inversely proportional. For example, if the speed of a bearing is increased by a factor of one, the life of the bearing is reduced by half. Conversely, if the speed is reduced by half, the life of the bearing increases by a factor of one. However, if the load on the bearing increases by a factor of 1, the life of the bearing will be reduced to 1/8~1/10, so obviously the effect of load on the bearing is more serious.

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