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Introduction of bearings

Introduction of bearings

2022-12-07

Rotational Torque of Cylindrical Roller Bearings


Torque Rotational Torque—The resistance to rotation of a bearing depends on load, speed, lubrication conditions, and inherent characteristics of the cylindrical roller bearing. For grease or oil mist lubricated bearings, the torque is generally lower, although the torque for grease lubrication also depends on the amount and viscosity of the grease.


Lubrication To reduce friction in bearings, lubrication is required to: • Minimize rotational resistance due to deformation of rolling elements and raceways when loaded • Minimize sliding friction between rolling elements, raceways and cage • Transfer heat ( Lubricated with oil) • Anti-corrosion, lubricated with grease to prevent ingress of contaminants Lubricated and sealed.


Conventional anti-rust and anti-oxidation lubricants for bearings


ISO Viscosity System Conventional Rust and Oxidation Lubricants Conventional Rust and Oxidation (R&O) Oils are the most common industrial lubricants. These lubricating oils can be applied to wholesale bearings used in various industrial occasions without special conditions. Lubricating Oil Properties Properties Base Raw Materials Refined High Viscosity Index Petroleum Additives Anti-Corrosion and Anti-Oxidant Viscosity Index Minimum 80 Pour Point Maximum -10°C Viscosity Grade ISO/ASTM 32 to 220 High viscosity grade. High speed and/or low temperature applications require lower viscosity grades.


Industrial Gear Oils Extreme pressure gear oils lubricate bearings in most heavy-duty industrial equipment. They are capable of withstanding the unusual shock loads often found in heavy-duty equipment. They should not contain materials that could be corrosive or abrasive to the custom bearing. Inhibitors should provide long-term protection against oxidation and protect bearings from corrosion in the presence of moisture. The lubricating oil should be able to avoid foaming during use and have good waterproof properties. Extreme pressure additives also prevent galling under boundary lubrication conditions. A wide range of viscosity grades is recommended. High temperature and/or low speed applications generally require higher viscosity grades. Low temperature and/or high speed applications require lower viscosity grades.

What is the effect of cleanliness on the performance of bearings


The cleanliness of the bearing has a considerable impact on the life of the bearing. The bearing has been specially tested for this purpose, and the result is that the difference is several times or even dozens of times. The higher the cleanliness of the bearing, the longer the life of the miniature deep groove ball bearings. The tests of others have shown that lubricating oils with different cleanliness have a great influence on the life of the ball bearing. Therefore, improving the cleanliness of the lubricating oil can prolong the life of the bearing. In addition, if the dirt particles in the lubricating oil are controlled below 10um, the life of the bearing will also increase several times.


Effect on Vibration:

The test results of the bearing test center show that the cleanliness seriously affects the vibration level of the bearing, especially the vibration in the high frequency band is more significant. Bearings with high cleanliness have low vibration velocity values, especially in high frequency bands.


Impact on Noise:

The effect of dust in bearing grease on noise has been tested, and it has been proved that the more dust there is, the greater the noise will be.


Influence on Lubrication Performance:

The decline of bearing cleanliness not only affects the formation of lubricating oil film, but also causes the deterioration of lubricating grease and accelerates its aging, thus affecting the lubricating performance of lubricating grease.


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