Minimum load of tapered roller thrust bearing

Minimum load of tapered roller thrust bearings - SKF bearings:

In order to ensure satisfactory operation, like all ball bearings and roller bearings, tapered roller thrust bearings must always withstand a certain minimum load, especially when the bearing is running at high speed or in the direction of the load being subjected to high acceleration or rapid change. In the state. The inertial forces of the rollers and cage and the friction of the lubricant can adversely affect the rolling condition in the bearing arrangement and can cause destructive sliding between the rollers and the raceways.

The following formula can be used to estimate the minimum axial load to be applied to a one-way tapered roller thrust bearing:

among them:



Fam = minimum axial load, kN

A = minimum load factor (see product table)

n = speed, r/min

Higher loads are required even at low temperatures or when the viscosity of the lubricant is very high. The weight of the components supported by the bearing plus the external force should generally exceed the minimum required load. Otherwise, an additional axial load must be applied to the one-way tapered roller thrust bearing.

China's automotive bearing network, the leading website of the automotive bearing industry, subordinate features: bearing model query, bearing model query software, bearing navigation, etc., look forward to your attention, please continue reading:

It is not necessary to check the minimum axial load of the screw-on bearing because such a bearing applies a preload through the O-ring or a spring-loaded preload in the reversing mill. When a preload is applied using an O-ring, the preload force should compress the diameter of the O-ring by approximately 20%.

When the bearing is preloaded by a spring, the minimum load depends on the weight of the relevant component. According to the requirements, SKF Application Engineering Services can provide the corresponding values.

For more information and purchase please visit: https://www.supplyforever.com

Brief introduction: the stability of grease on the rolling bearing

The safety of bearing grease is very important for rolling bearings. It is generally recommended to use a thicker grease No. 3 instead of a less thick grease. On the contrary, in order to reduce the chaos of the bearing, especially the start-up and chaos, for bearings with low ordinary speed, it is better to use low-consistency grease.

The plastic viscosity of the grease is greater than the viscosity of the base oil, and the grease film has a clear elasticity, so its load resistance is greater than that of the base oil. Only the viscosity of the base oil is appropriate, and the resistance of the grease is not fruitful. Under the condition of boundary lubrication or extreme pressure lubrication, it mainly relies on additives to improve the wear resistance and extreme pressure function, and meet the requirements of lubrication conditions.

Proper use of grease requires knowledge of the movement of the grease in the bearing. The movement of the grease filled in the rolling bearing can be roughly divided into two stages as the bearing rotates. Under normal circumstances, the amount of grease filled in the bearing always exceeds the theoretical demand for direct participation in lubrication. In the initial stage of the bearing crucible, most of the grease is squeezed out quickly (less than one minute). And accumulate in the cavity of the support frame and the bearing cover, and form a contour at the center of the rolling element. In this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the beginning of the run, the grease that is squeezed into the raceway attachment can still be brought between the raceways by the rolling element. These greases are discharged in large quantities as they circulate with the bearing rotor. At this time, the bearing temperature continues to rise until the excess grease is completely discharged, which can be called the grease's walking phase. According to the grease quality and filling amount in the bearing structure, this time can last for ten minutes. Even a few hours.

After the remaining grease is completely discharged, the remaining large amount of grease forms a thin layer of grease film on the mutual contact surface of the rolling element, the raceway and the holding frame, thereby entering the normal stage of the bearing. . At this point the temperature gradually drops and reaches a balanced shape. That is to say, the temporary lubrication is mainly borne by this layer of grease film. In addition, during the temporary operation of the bearing, the contour of the rolling element and the raceway and the grease on the support frame are shrunk to separate a part of the base oil, and after flowing into the raceway, the lubrication is also supplemented.

For more information and purchase please visit: https://www.supplyforever.com