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Detailed application of the rolling bearing and detailed analysis of the problem
Source: Bearing network time: 2017-12-25
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2, the smooth rolling bearing of the bearing commonly used smoothing agent has smooth oil and smooth grease two. When the circumferential 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.
The smoothness of smooth grease is a simple seal layout; smooth grease is not easy to lose; it is not affected by 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.
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 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 the hand; the handle should not be felt as normal; otherwise, the bearing temperature is too high.
The reason why the bearing temperature is too high is that the smooth oil quality does not meet the demand or the enthalpy change; the smooth oil viscosity is too high, the tissue device is too tight (the gap is lacking), the bearing device is too tight, the bearing race is changed on the shaft or the shell, and the load is over Large, bearing cage or rollover fragmentation.
2, bearing noise rolling bearing in the operation promised a subtle work sound; if the sound is too loud or there are abnormal noise or impact sound; then indicate that the bearing is faulty.
The cause of the noise of the rolling bearing is more complicated; the first is the wear of the inner and outer rings of the bearing. Because of this wear; the cooperation between the bearing and the shell, the bearing and the shaft is destroyed; the axis is deviated from the correct orientation; Abnormal noise during high-speed movement. When the bearing is exhausted; its appearance metal falls off; it will also increase the radial gap of the bearing.
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. Bearing burn burned 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.
2, bearing seat crack bearing seat ring cracks can be caused by the bearing cooperation too tight; bearing foreign or inner ring loose; bearing housing deformation; equipment bearing surface processing is not good.
3. The uneven surface of the raceway and the roller touch surface of the plastic deformation bearing; the plastic deformation of the bearing is clarified. The reason is that the bearing is under the effect of large static load or impact load; The succumb to the limit; this condition usually occurs on bearings that rotate at low speeds.
4, the seat ring raceway severe wear can be falling into the seat inside the foreign body; smooth oil lack or smooth oil trademark is not suitable.
5. The effect of periodic pulsating load on the roll metal body of the raceway and the rolling surface of the inner and outer rings; then the contact stress of the cycle change. When the number of stress cycles reaches a certain value; in the roll or inside On the outer ring raceway, there will be fatigue and shedding. If the load of the bearing is too large, this fatigue will be aggravated. Others; the bearing device is not correct, the shaft is tortuous;
The fatigue of the bearing raceway will reduce the accuracy of the shaft; the tissue will oscillate and noise.
6. The metal of the cage adheres to the tumbling body. The reason for the tumbling is that the tumbling body is stuck in the cage or is lacking in smoothness.
7, the cage is broken due to the lack of smooth; the rolling body is broken; the seat is inclined.
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