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Benefits Of Preloading For SKF Bearings

Source:  skf bearing  Time:  2020-10-12

What is SKF Bearing Preload? Generally, Rolling Bearings have a certain clearance under working conditions. But in order to achieve a specific purpose, when the bearing is configured, the bearing is given a certain internal load through a certain adjustment method and used in a state of negative clearance. This method of use is called preload.


What are the benefits of preloading on SKF Bearings? For rolling bearings, proper preloading can have the following benefits:


1. Improve the rotation accuracy.

After the bearing is preloaded, the internal clearance is eliminated, and each rolling element bears a certain preload, and the ring is supported from all directions, which can improve the rotation accuracy, make the shaft be positioned correctly in the axial and radial directions, and improve the shaft The accuracy of the rotation, such as machine tool spindle bearings and measuring instruments.


2. Improve stiffness.

The rolling element and the raceway are all in elastic contact, and the rolling element can be regarded as a spring. SKF Bearings with clearance are supported by only a few springs in the force direction. The pre-tightened bearings are supported by springs in all directions, and there is a certain amount of preload. The number of rollings under load is more than when there is a game, so the rigidity can be improved. In ball bearings, the relationship between the contact deformation of the ball and the channel and the load is nonlinear, and as the preload increases, the contact stiffness increases.


3. Improve bearing life.

After preloading, the number of loaded rolling elements increases, and the load on each rolling element decreases. At the same time, the load can be evenly distributed on each rolling element, so the life of the SKF Bearing can be improved.


4. Improve bearing damping and reduce noise.

Pre-tightening creates a stable oil film between the rolling element and the raceway, improves the damping between the rolling element and the raceway, and can improve the dynamic characteristics of the support structure and reduce noise.


5. Improve the dynamic performance of angular contact ball bearings.

In angular contact ball bearings rotating at high speed, proper preloading can prevent the steel ball from spinning, prevent or reduce the slip of the steel ball's revolution, and also control the spin slip of the steel ball.

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6. Restrain vibration and friction and wear.

The outer spherical bearing is actually a variant of the deep groove ball bearing, which is characterized in that its outer ring outer diameter surface is spherical and can be fitted into the corresponding concave spherical surface of the bearing seat to play a self-aligning role. The outer spherical bearing is mainly used to bear the combined radial and axial load mainly radial load, it is generally not suitable to bear the axial load alone. It is used in the vibration-free processing of low-roughness processing machine tools, or in the mechanism that needs to control friction and wear when starting and stopping frequently.


7. Control the slipping phenomenon of the revolution and rotation of the rolling body.

The spherical bearing with seat is also designed with certain self-alignment, easy to install, and has a double-structured sealing device, which can work in harsh environments. The bearing housing is generally formed by casting. Bearings with housings are high-precision component products composed of grease-sealed deep groove ball bearings and bearing housings of various shapes. The bearing assembly can be directly mounted on the main body of the mechanical device through several bolts. It has a self-aligning function and can be used to supplement grease. Such as centripetal thrust ball bearings used in high-frequency motors and cylindrical roller bearings on jet engines.


8. Compensation for wear during operation.

The bearing will increase the clearance due to wear during operation, which can be compensated by preloading.


Although bearing preloading is not so necessary, it is very helpful for the use of daily bearings and can effectively improve the service life and use effect of SKF Bearings. I hope everyone can pay attention to it and contact us if you are interested in our products.

The bearings sold by Eric Bearings Limited are of excellent quality, and the price is much cheaper than other distributors. The products are exported to more than 100 countries and regions in the world, winning wide acclaim from customers and establishing long-term cooperative relations with them. In order to expand the scope of business, we also hope to establish trade relations with more customers and develop together.