What is bearing preload? Generally, rolling bearings have a certain clearance under working conditions. However, in order to achieve a specific purpose, when configuring the bearing, the bearing can obtain a certain internal load through a certain adjustment method and use it in a negative clearance state. This method of use is called preload.What are the benefits of preload on bearings? For rolling bearings, proper preload 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, supporting the ferrule from all directions, which can improve the rotation accuracy, enable the shaft to be positioned correctly in the axial and radial directions, and improve the shaft. Rotational accuracy, such as machine tool spindle bearings and measuring instruments.2. Improve rigidity. The contact between the rolling element and the raceway is elastic contact, and the rolling element can be regarded as a spring. Bearings with clearance are only supported by a few springs in the direction of force. The preloaded bearing is supported by springs in all directions, and has a certain amount of preload, and the number of rollings under the load is more than that of the bearing, so the rigidity can be improved. In ball bearings, the relationship between the contact deformation of the ball and the raceway and the load is nonlinear, and the contact stiffness increases with the increase of the preload.3. Improve bearing life. After preloading, the number of loaded rolling elements increases, the load on each rolling element decreases, and the load can be distributed evenly on each rolling element, so the life of the bearing can be improved.4. Improve bearing damping and reduce noise. Preloading establishes a stable oil film between the rolling elements and the raceways, improves the damping between the rolling elements and the raceways, improves the dynamic characteristics of the support structure and reduces noise.5. Improve the dynamic performance of angular contact ball bearings. In high-speed rotating angular contact ball bearings, proper preload can prevent the gyroscopic rotation of the steel ball, prevent or reduce the revolving slip of the steel ball, and control the spin sliding of the steel ball.6. Inhibit vibration lines and friction and wear. The outer spherical bearing is actually a variant of the deep groove ball bearing. The outer spherical bearing is mainly used to bear the combined radial and axial load mainly based on the radial load, and it is generally not suitable to bear the axial load alone. It is used for vibration-free machining of low-roughness machining machines, or in mechanisms that need to control friction and wear when starting and stopping frequently.7. Control the slip phenomenon of rolling body revolution and rotation. Spherical bearing with seat This type of bearing is also designed to be self-aligning, easy to install, and has a double-structured sealing device, which can work in harsh environments. The bearing seat is generally cast.Bearings with housings are high-precision components made up of grease-sealed deep groove ball bearings and housings of various shapes. The bearing assembly can be directly installed on the main body of the mechanical device through several bolts, has the self-aligning function, can supplement the grease, etc. It is a product that is very easy to install and use.8. Compensate for wear during operation. Bearings will increase in clearance due to wear during operation, which can be compensated by preloading

What is bearing clearance?In simple terms, bearing clearance is the clearance (or interference) within a single bearing, or within a system of several bearings. Clearance can be divided into axial clearance and radial clearance, depending on the bearing type and measurement method.Why adjust bearing clearance?For example, too much or too little water when cooking rice will affect the taste of the rice. In the same way, if the bearing clearance is too large or too small, the working life of the bearing and even the stability of the entire equipment operation will be reduced.The Importance of Correctly Selecting Bearing ClearanceClearance is an important technical parameter of the bearing, which directly affects the technical performance of the bearing, such as load distribution, vibration, noise, friction, temperature rise, service life and mechanical running accuracy.If the clearance is too large, the bearing area inside the bearing will be reduced, the stress of the contact surface will increase, and the service life will be shortened. Excessive clearance will also reduce the running accuracy of the bearing and increase vibration and noise.If the clearance is too small, there may be negative clearance (interference) in actual operation, which will lead to increased frictional heat and temperature rise, which will make the effective clearance smaller or the interference larger. Such a vicious circle will lead to bearing holding die.

In order to prevent rust when the bearing leaves the factory, anti-rust oil is generally applied on the surface of the bearing, and the mixture of anti-rust oil and grease will cause the grease to deteriorate, so when we disassemble and use, we must first clear the anti-rust oil, and rough washing. Avoid rotating the bearing as much as possible. Use a brush to roughly remove the attachments on the bearing. When it is fine, you can gently rotate the bearing to clean it. The cleaning agent must be kept clean. After cleaning, dry the bearing and fill it with grease.

How small are miniature bearings?It refers to a single row deep groove ball bearing with an inner diameter of less than 10 mm.So where can it be applied?It is suitable for all kinds of industrial equipment, small rotary motors and other fields with high speed and low noise, such as: office equipment, micro motors, instrumentation, laser engraving, small clocks, soft drives, pressure rotors, dental drills, hard disk motors , Stepper motors, video recorder drums, toy models, computer cooling fans, money counters, fax machines and other related fields.The production process of miniature bearings is more precise than ordinary bearings, and the cost of long-term replacement of miniature bearings is relatively high, so how to prolong the service life of miniature bearings? Xiaoyun, who has many years of experience in the production of miniature bearings, has summarized the following four main points for youIt is important to install miniature bearings correctlyWhether the installation process of the miniature bearing is correct affects the precision, life and performance of the miniature bearing. The correct installation of the bearing requires the design and assembly department to have sufficient research and rich practical experience on the installation process of the miniature bearing. And at the same time, the production operation department should install according to the operation standard.Specific work standard items are usually as follows:1. Cleaning, the bearing and bearing-related components must be carefully cleaned before the bearing is installed2. Check the dimensions of the associated components and the finishing conditions of the supporting parts to see if the process requirements are loaded3. After installation, it is necessary to check the bearing lubricant and whether the basic operating conditions of the bearing are normal.4. External conditions should be monitored during the use of miniature bearings, such as monitoring of temperature, vibration and noise.If the above standards are carried out according to the requirements, it will help to prolong the service life of the miniature bearing. Regular security inspection will help to find potential problems early, prevent unexpected phenomena of the machine, allow the production plan to be realized, and improve the productivity and efficiency of the factory.Micro bearing cleaning methodThe surface of the miniature bearing will be coated with anti-rust oil. We must carefully clean it with clean gasoline or kerosene when using it, and then apply clean high-quality or high-speed and high-temperature lubricating grease before installation and use. The reason for this is simple, because the impact of cleanliness on the life and vibration noise of miniature bearings is very large. But Xiaoyun reminds that the fully enclosed bearing does not need to be cleaned and refueledMiniature Bearing Grease SelectionSince the grease is made of base oil, thickener and additives, the performance of different types and different grades of greases of the same type is very different, and the allowable rotation limits are different, so be careful when choosing.The performance of the grease is mainly determined by the base oil. Generally, the low viscosity base oil is suitable for low temperature and high speed; the high viscosity base oil is suitable for high temperature and high load. The thickener is also related to the lubricating performance, and the water resistance of the thickener determines the water resistance of the grease. In principle, greases of different brands cannot be mixed, and even greases with the same thickener will have adverse effects on each other due to different additives. It is a common misconception that more grease is better when lubricating miniature bearings.Relubrication of miniature bearingsRelubrication of bearings During operation, miniature bearings require correct relubrication to perfect their performance. Miniature bearing lubrication methods are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing.