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Analysis of the lifespan and limit speed of Koyo imported bearings
Source: China Bearing Network Time: 2013-03-03
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2, the installation method of the bearing: because the bearing is a high-precision product; if the installation is not simple, it is easy to damage the channel of the Koyo bearing; cause damage to the bearing. The bearing should have a special mold when installing; can not be hit at random; When entering the shaft, only a small circle is stressed; when pressing a large circle, only a large circle of force is required. When installing, the air pressure or hydraulic pressure is required; when pressing, the upper and lower touches are outside the horizontal condition; if there is a skew, the bearing channel will be caused. Damaged by force; and the bearing is caused to sound.
3. Avoidance of installing foreign objects: When the bearing is mounted on the rotor to make dynamic balance, it is very simple to put the iron filings that occur during dynamic balancing into the bearing; therefore, the best is to balance the load before loading the bearings. Some manufacturers are convenient for installation; Apply some oil or grease to the bearing chamber to smooth the effect; but it is often difficult for the operator to control the amount; if oil or grease accumulates in the bearing chamber; it is very easy to enter the bearing along the shaft when the bearing changes. The best part of the bearing chamber is not to apply oil or grease; if it is not painted, it must be handled without accumulation in the bearing chamber.
4, the prevention of paint rust: paint rust is characterized by multiple seals in the motor; the motor sounds very good when installed; but after some time in the warehouse; the motor is very loud; the bearing is removed Severe rusting appearance. Many manufacturers once thought it was a bearing problem; through our constant publicity; now the motor factory has realized that it is the primary problem of insulating varnish. The problem is mainly due to the acidic substance evaporated from the insulating varnish. The corrosive substance is formed under temperature and humidity; the bearing of Koyo imported bearing is corroded and the bearing is damaged. The problem can only be selected from good insulating paint; and it is installed after drying for a while.
The bearing life is the total number of revolutions or the number of hours of operation at a certain speed before any component in the bearing is fatigued.
If the rotation speed of Koyo's imported bearings is too high, high temperature will occur between the conflicting surfaces; the smoothing agent function will be affected; the oil film will be damaged; then the moving body will be tempered or the component will be glued.
The limit speed of the bearing refers to the value of the bearing under the premise of the necessary operation; the speed at which the maximum heat balance temperature can be accepted. The operating speed of the bearing should be lower than the limit speed.
The limit speed values ​​given in the bearing function table are determined on the premise that the grease is smooth and the oil is smooth; and it is only used for class 0 public service, smooth cooling is normal, cooperation with rigid bearing housing and shaft, bearing load P≤0 1C (C is the fundamental extra dynamic load of the bearing; the radial bearing is only subjected to radial load; the thrust bearing is only subjected to axial load).
When the bearing load P>0. 1C; the touch stress will increase, when the Koyo imported bearing accepts the combined load; the loaded moving body will be added; this will increase the conflict between the bearing touch and the appearance; the smooth condition will be deteriorated. The limit speed value should be revised.
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