Application and selection of motor bearings

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Application and selection of motor bearings
Source: Bearing network time: 2013-02-05
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Following the advancement and development of society; mechanization has been widely used in production and in the days. Bearings are not a part of machinery; their use will be more and more extensive; because of the need to change the local area to use bearings. Bearings in the machinery are mainly to support and reduce the friction; so the bearing accuracy, noise, etc. are directly related to the use of machinery and life. But business people often encounter some customers that use the best bearings or imports The power of the bearing is not high; this is related to the application and selection of the bearing. Some people may say that "the use and selection of the bearing is the user's business; I only want the user to sell me." But as a qualified In addition to knowing the common sense of the product itself, the salesperson must be familiar with the use of the product; that is, the sale of the physician type; select the best supporting bearing according to the function and application conditions of the user's accessory products. This is the prevailing professionalism of the major companies in the world. Production and sale; this method has also played an outstanding role since the implementation of the People's Group. Due to the wide variety of types of bearings; Make some analysis on the application and selection of the most widely used deep groove ball bearings. It is expected that people who know less about bearings can deepen their knowledge of bearings. 1. Selection of bearings 1. Selection of bearing types: Bearing types are usually used by users. The technician selects the bearing according to the operating conditions of the supporting product and the receiving load. The business personnel first knows whether the user's practical load can match the selected bearing; if the bearing does not meet the operational requirements; the customer should be quickly reassigned to the type; Unless special products are usually not difficult to select in the type of selection. 2. Selection of bearing clearance: users usually only report the type and grade of the bearing when purchasing the bearing; rarely ask for the clearance of the bearing; It is necessary to ask about the operating conditions of the bearing, the speed of the bearing, the temperature, and the joint public service are directly related to the selection of the bearing clearance. Usually, the motor with a speed of 3500 rpm or less is mostly CM clearance; for example, a high-temperature high-speed motor The demand uses a relatively large clearance. After the installation, the bearing clearance will be reduced due to the increase of the inner hole and the reduction of the outer circle; Reduction amount = interference amount Ã— 60% (the bearing chamber is aluminum). The clearance before the bearing is 0. 01mm; the interference at the time of installation is 0. 01mm; the clearance after the bearing is installed is 0. 004mm In theory, the noise and the lifespan of the bearing at the zero clearance reach the best condition; but in the practical work, the temperature rise and other difficulties are considered; the clearance of the bearing after installation is 0. 002mm-0.004mm is better. 3 Selection of grease: The selection of grease is usually based on the bearing speed, temperature resistance, noise demand and starting torque; the demanding business personnel know the function of various greases. 4. Selection of bearing seal type: bearing The smoothness can be divided into oil smooth and grease smooth. Oil smooth bearings are usually the method of choice; grease smooth bearings are usually sealed with dust caps or rubber seals. Dust caps are suitable for high temperature or good environment; seals Touch type seal and non-touch type seal; touch type seal has good dustproof function but large starting torque; non-connected seal starting torque. èŠŠåº‘ è‹Š è‹Š è‹Š è‹Š . . . äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äºº äººMotor bearing Motorcycle bearings, health motor bearings and other occupations have been professionally produced; the noise and life of the bearings have reached the optimal condition. Second, the bearings should be used when handling 1, the shaft and bearing room public service selection and control: bearing pressure After entering the bearing, it should be changed to be sensitive and unblocked. If there is significant change, it is not sensitive; then the scale of the shaft is too large; the public service should be lowered. If the bearing is pressed into the shaft, the hand shift has a significant "sand" feeling; It may be that the public service of the shaft is too large or the roundness of the shaft is not good. Therefore, the roundness should be controlled when the shaft and the bearing chamber are controlled. Many domestic manufacturers only control the public service; there is no roundness. Control. 2. Bearing installation method: Because the bearing is a high-precision product; if the installation is not simple, it will damage the bearing channel; cause damage to the bearing. The bearing should have a special mold when installing; When pressing the shaft, only a small circle of force is applied; when the large circle is pressed, only a large circle of force is applied. When installing, the air pressure or hydraulic pressure is required; when the press is installed, the upper and lower molds are outside the horizontal condition; if there is a skew, the bearing channel is incurred. Damaged by force; The occurrence of the sound. 3, the installation of foreign objects to avoid: the bearing is loaded on the rotor to do the dynamic balance is very simple to the iron balance occurred in the dynamic balance into the bearing; therefore the best is to load the ball before the dynamic balance. Some manufacturers in order to Easy to install; apply some oil or grease to the bearing chamber for smoothing during installation; but often it is difficult for the operator to control the amount; if oil or grease accumulates in the bearing chamber; it is very simple along the shaft when the bearing changes Enter the inside of the bearing. The best part of the bearing chamber is not to apply oil or grease; if it is not coated, it must be handled without accumulation in the bearing chamber. 4. Prevention of paint rust: The characteristic of paint rust is mostly in the sealed motor; The motor sounded very well during installation; but after some time in the warehouse; the abnormal noise of the motor changed greatly; the bearing was severely rusted. Many manufacturers once thought it was a bearing problem; through our constant publicity Nowadays, the motor factory has realized that it is the primary problem of insulating varnish. The problem is mainly due to the fact that the acidic material evaporated by the insulating varnish forms a corrosive substance under a certain temperature and humidity; After the channel corrosion, the bearing damage is caused. The problem can only be selected from good insulating paint; and it is installed after ventilation for a period of time after drying. The life of the bearing is closely related to the production, installation and operation; it is necessary to Every link is done; in order to keep the bearing in the best working condition; then extend the service life of the bearing.
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