What are the factors that affect the life reliability of crossed roller bearings during their use?

Definition of bearing life:

Bearing life: The number of revolutions or working hours that a bearing rotates from the beginning of use to the occurrence of fatigue spalling under rotating conditions.

Factors affecting the reliability of crossed roller bearings:

The reliability of cross roller bearings undoubtedly comes from three parts. The first part is guaranteed by the bearing manufacturer, which ensures that the bearing is carefully designed (heat dissipation, internal force), uses advanced materials (high purity steel), is carefully manufactured (strength, hardness, precision, etc.), and is properly transported and stored. The second part is guaranteed by the OEM manufacturer, which ensures that the bearing is correctly selected and fully lubricated. The third part is guaranteed by the user unit, which ensures that the bearing is correctly installed, properly lubricated, and well maintained.

1. Mechanical reasons

Exceeding the rated dynamic load capacity of the bearing will disproportionately reduce the bearing fatigue life.

2. Wrong lubrication

There are many important lubricant properties that, when altered or impaired, can dramatically reduce bearing life and reliability. These include additives (AW, EP, etc.), acid number, viscosity, pressure-viscosity coefficient, and viscosity index. Using the wrong lubricant, degraded lubricants, mixing incompatible lubricants, and/or contaminated lubricants can lead to a loss of lubricant performance.

• Lubrication contamination

The "number one killer" of lubrication contamination includes particles, water and other substances.

4. High temperature operation

Heat is also a contaminant. It is the cause and result of most lubrication and mechanical problems. For example: overlubrication (too much grease) is a common cause of heating in grease-lubricated bearings.

5. Insufficient lubrication

After a long period of operation, the lubricating oil or grease of the cross roller bearing will dry up and must be properly relubricated. Incorrect relubrication intervals are usually the primary cause of insufficient lubrication, but cold starts, dry starts and lubrication leakage problems can also cause insufficient lubrication. Other factors that cause insufficient lubrication are also related to the failure of other lubrication components, such as oil cups, oil slingers, oil slingers, single-point devices, centralized systems, etc.

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