Causes of cage breakage during bearing use
Published on:
2025-10-30 17:19
Cage breakage in raceway bearings is relatively rare among bearing failures. Typically, the cage is considered as a rigid body subjected to a complex system of forces.
The forces acting on the cage mainly include:
Impact and friction forces on the interaction surfaces between the cage and the rolling elements;
Normal and friction forces on the contact surfaces between the cage and the guide flanges of the raceways;
Forces caused by the imbalance of the cage's center of mass;
Gravity;
Cage inertial forces;
And other forces (i.e., viscous friction and agitation forces of the lubricant on the cage).
The main causes of cage breakage are:
- Installation damage;
- Exceeding the permissible speed;
- Wear and poor lubrication. The grease is contaminated by hard external particles, or there is too little or no lubricant.
- The torque load is too high or the ball bearing is misaligned. This can occur in ball bearings subjected to combined loads, where the bearing rings are excessively misaligned. Consequently, the balls exhibit different circumferential velocities.
Remedial measures:
Careful installation;
Filtering the lubricant;
Increasing the lubricant dosage/or using a lubricant of suitable viscosity;
Avoiding tilting as much as possible;
Using preloaded mating bearings whenever possible.
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