Bearing failure analysis is an important component of system engineering aimed at improving the reliability of working surfaces. The working function of bearings is defined by their specified losses, resulting in failure or non operation as a failure phenomenon. Bearing failures can be divided into two types based on their normal life failure and two early failures. This mainly analyzes the causes of early bearing failures caused by pitting and fatigue, and proposes improvement suggestions to improve the life and reliability of rolling bearings.

The fatigue failure of rolling bearings is a surface form of failure, mainly manifested as the initiation, propagation, and fracture processes of fatigue cracks, and the long-term effects of load failures under alternating conditions on the metal. The rolling bearing uses a cage made of glass fiber reinforced nylon 66, which is suitable for stable working temperatures not exceeding 120 degrees. When using oil lubrication for this type of bearing, if the oil contains additives, it may shorten the service life of the cage. When the temperature exceeds 120 degrees, aged lubricating oil will also shorten the life of the retainer. Therefore, it is important to observe and replace the lubricating oil as scheduled.

Sealed rolling bearings are lubricated with specially tested high-quality lithium based grease. This type of grease can withstand a high temperature of 120 degrees Celsius for a short period of time. If the stable operating temperature reaches 70 degrees or higher, the lifespan of standard lithium based grease will be shortened. To work frequently at high temperatures, special lubricating grease must be used, and attention should be paid to whether heat-resistant materials are needed as sealing devices. The operating temperature of standard contact seals cannot exceed 110 degrees. If high-temperature synthetic materials are used for sealing, it is also necessary to consider that this highly effective fluorinated material will release harmful gases and smoke beyond 300 degrees Celsius. Especially when using a welding gun to disassemble rolling bearings, it is important to pay attention to this point.

1. The ability of rolling bearings to withstand loads is much smaller than that of sliding bearings of the same volume, therefore, the radial size of their rolling bearings is larger. Therefore, sliding bearings are often used in situations that require large loads, small radial dimensions, and compact structures.

2. The vibration and noise of bearings are relatively high, especially in the later stages of use. Therefore, in situations where precision bearings are highly required and vibration is not allowed, sliding bearings are generally preferred for better results.

3. Rolling bearings are particularly sensitive to foreign objects such as metal shavings. Once foreign objects are mixed in, they will produce intermittent large vibrations and noise, which can easily lead to damage. So the lifespan of rolling bearings also has a certain limit. In short, the lifespan of rolling bearings is shorter than that of sliding bearings.