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The correct application of the rolling bearing and the cause of the problem
Source: China Bearing Network Time: 2017-09-15
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First, the correct use of rolling bearings. Smooth smoothing bearings for bearings commonly used smoothing agents are smooth oil and smooth grease. When the peripheral speed of the shaft is less than 4-5m / s; or the car can not use smooth oil smooth parts; all use smooth grease smooth. Smooth grease The smooth strength is that the sealing layout is simple; the smooth grease is not easy to lose; it is not affected by the temperature; adding a smooth grease can use a longer time.
The use of smooth grease should pay attention to two problems; one is to clarify the requirements of the book according to the car; select the smooth grease of the appropriate trademark. For example; the automotive water pump bearing should not use the nano-smooth grease; because of its poor water resistance. The smooth grease in the excess is required; usually only 1/2-l/3 of the bearing cavity is filled; too much is useless; the working resistance of the bearing is added; the heating is heated. The unique attention is the automobile wheel bearing To initiate "empty hub smooth"; that is, only apply a layer of excess smooth grease on the bearing; otherwise; not only bad and bad heat; it will also make the smooth grease overflow; can affect the braking function.
The smooth strength of smooth oil is the conflict resistance. 20. è‹Œ (4) 龋 饕糜诟咚俸 饕糜诟咚俸 饕糜诟咚俸 ã·éª° 澄 澄 澄 澄 澄 澄 å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ å²¢ 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑 光滑Replace; after the old oil is released, the organization should be cleaned and then added with new oil; the fuel should be added to the regular marking; or flush with the fueling port (depending on the detailed layout of the car, demand);
2. The bearing should be cleaned and cleaned before the disassembly and assembly of the bearing; the special bearing should be used to press the auxiliary bearing straight and evenly; do not hit with a hammer; uniquely stop the tap directly on the bearing. When the bearing seat and seat When the hole cooperation is loose; the seat hole or the replacement bearing should be corrected; do not use the method of pitting or padding on the bearing cooperation surface. The bearing should be pulled out with a suitable puller when the bearing is disassembled; do not use a chisel , hand hammer and other percussion bearings.
Second, the common problems of rolling bearings, rolling bearing problems usually appear in two; first, there is noise in the bearing operation; second, the temperature of the bearing device is too high.
1. The bearing noise rolling bearing promises a slight operation sound during operation; if the sound is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty. The reason for the noise of the rolling bearing is more complicated; the first one is the inside and outside of the bearing. The circle cooperates with external wear. Because of this wear; it destroys the cooperative connection between the bearing and the shell, the bearing and the shaft; causes the axis to deviate from the correct orientation; the abnormal sound occurs when the shaft is moving at high speed. When the bearing is exhausted; the outer metal Shedding; will also make the bearing radial gap increase the abnormal sound. In addition; the bearing is lack of smooth; constitute a dry conflict; and bearing crushing, etc. will have abnormal movements. After the bearing wear loose; the cage is loose and damaged; ring.
2. If the bearing temperature is too high during the organization operation; the part of the bearing of the device promises a certain temperature; when the tissue is touched by hand; it should be normal without feeling the trick; otherwise, the bearing temperature is too high. The reason why the bearing temperature is too high is : Smooth oil quality does not meet demand or transformation; smooth oil viscosity is too high, tissue device is too tight (void is lacking), bearing device is too tight, bearing race is changed on shaft or inside of shell, load is too large, bearing cage or tumbling Body fragmentation, etc.
Third, the damage of the rolling bearing when the rolling bearing is disassembled and viewed; the bearing fault and the cause of the damage can be judged according to the damage condition of the bearing.
1. The plastic deformation bearing has uneven pits on the touch surface of the raceway and the roller; it clarifies the plastic deformation of the bearing. The reason is that the bearing is under the effect of large static load or impact load; the partial stress of the external work exceeds the yield of the data. Limit; this condition usually occurs on bearings that rotate at low speeds.
2. The reason why the metal of the cage adheres to the tumbling body is that the tumbling body is stuck in the cage or is lacking in smoothness.
3. The cause of the crack in the bearing ring crack bearing seat can be that the bearing cooperation is too tight; the bearing foreign or inner ring is loose; the bearing housing is deformed; the bearing bearing surface is poorly processed.
4. Bearing burn burn bearings have tempering color on the raceway and roll body. The cause of burn is usually lack of smoothness, smooth oil quality does not meet the demand or transformation; and the bearing device is too tight.
5. Severe wear of the raceway can be caused by foreign objects falling into the race; lack of smooth oil or smooth oil trademark is not suitable.
6. The reason why the cage is broken is that it is smooth and lacking; the rolling body is broken; the seat is inclined.
7. The rolling surface outer metal bearing bearing rolling body and the inner and outer ring raceway surfaces all receive the effect of periodic pulsating load; then the contact stress changes during the attack cycle. When the number of stress cycles reaches a certain value; in the rolling body or inside and outside If the bearing load is too large, the fatigue will be aggravated. Others; the bearing device is not correct, the shaft is tortuous; the raceway will be off the surface. The bearing raceway will be worn off. The accuracy of the descent axis; the tissue oscillation and noise.
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