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What are the damage forms of thin-walled crossed roller bearings?

01-10, 2023 / in News / by PRS

Thin-walled crossed roller bearings are composed of crossed cylindrical roller bearings and crossed tapered roller bearings. Due to their particularity and incomparable advantages over other bearings, they are widely used, and some damages will inevitably occur in the use engineering , so what are the damage forms of thin-walled cross rollers?

Surface wear and peeling of rolling elements (balls and balls, etc.) and inner and outer ring raceways:

This will cause the radial clearance and axial clearance of the thin-walled crossed roller bearing to increase, the thin-walled crossed roller bearing will emit noise and heat during operation, and change the correct working position of the mating shaft, resulting in vibration. The initial stage of surface fatigue spalling is pitting on the surface, which develops into flaky surface exfoliation. Both the rolling elements of the bearing and the raceway surfaces of the inner and outer rings are subjected to periodic pulsating loads, resulting in periodically changing contact stress.

When the number of stress cycles reaches a certain number, fatigue spalling occurs on the working surface of the rolling elements or inner and outer ring raceways. If the load of the bearing is too large, this fatigue will be exacerbated. In addition, if the bearing is installed incorrectly and the shaft is bent, the raceway will also peel off. The fatigue spalling of the bearing raceway will reduce the running accuracy of the shaft and generate vibration and noise. 

crossed roller bearings

Wear of mating surfaces of inner and outer rings:

This is because the inner and outer rings of the thin-walled crossed roller bearing are not assembled with the shaft and the housing hole, which destroys the matching relationship between the bearing and the housing, the bearing and the shaft, and further accelerates the matching between the bearing itself and the shaft or housing that matches it. Surface wear (commonly known as the inner or outer ring of the shaft).

Spacer wear and looseness:

During work, the isolation ring and the rolling elements (balls, rollers, etc.) rub against each other, and if the lubrication is poor, the wear will be accelerated. After the isolation ring is worn, the rolling elements will loosen, and in severe cases, the isolation ring will fall apart and the rolling elements will fall off. 

Burn:

If the lubrication is poor or the lubricating oil does not meet the requirements, and the clearance of the thin-walled crossed roller bearing is adjusted too small, the bearing will heat up rapidly during operation, and the working surface will be annealed due to high temperature. When observing the appearance, it can be found that the color of the working surface of the thin-walled crossed roller bearing changes.

Plastic deformation:

If there are uneven pits on the contact surface between the raceway and the rollers, it means that the thin-walled crossed roller bearing has plastic deformation.

The reason is that the local stress on the working surface of the bearing exceeds the yield limit of the material under the action of a large static load or impact load.

This situation generally occurs on low-speed rotating bearings. 

crossed roller bearings

Cracks in the race and broken cages:

The reason for the cracks in the thin-walled crossed roller bearing race may be that the bearing fit is too tight, the outer ring or inner ring of the bearing is loose, the containing parts of the thin-walled crossed roller bearing are deformed, and the surface processing of the thin-walled crossed roller bearing is poorly processed, etc. 

The reasons for the fracture of the cage are insufficient lubrication, broken rolling elements, skewed seat rings, etc. The serious wear of the raceway of the seat ring may be caused by foreign objects falling into the seat ring, insufficient lubricating oil, etc.

The above are the common damage forms of thin-walled crossed roller bearings. After understanding these damage forms, we must pay attention to avoiding these problems during use.
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