The latest method of routine maintenance and maintenance of FAG sliding bearings

First, the bearing maintenance technology problems:
Two major complications related to FAG bearing maintenance technology are: 1. When to change oil. 2. How much oil should be changed? If the oil change is too small, the sliding bearing will be scrapped in advance; if the oil is changed too much, the bearing will be in trouble or the power coil and the coil will be damaged for a long time.
Second, the maintenance technology of the bearing:
The way to determine when to lubricate and when to stop oiling is simple: monitor when developing a baseline, setting up an observation schedule, and filling the oil.
1. Develop a basic line
The bearing base line reflects the decibel strength under normal operating conditions, no visible errors, and sufficient lubrication.
Three ways to develop a baseline:
  1), comparison method: If there are multiple bearings of the same type, these sliding bearings can be put together for comparison. Use the same test method or observe each bearing from the same angle. Analyze the decibel intensity and sound quality. If there is no essential difference (less than 8 decibels), we can set it to the base decibel strength of each bearing.
  2) Set the basic line when adding lubricating oil: When adding lubricating oil, listen to the intensity of the sound, and when the sound intensity drops, then rise again. At this time, do not add too much oil, and set it as the basic line.
  3) History: Observe the decibel strength of the FAG bearing, record it every day, and then compare the recorded results for 30 days. If the decibel intensity changes little or no (less than 8 decibels), we can set this as the baseline and use it for later comparisons.
2, set the observation timetable
Equipment criticality associated with total production, environmental results, and operational results is a major factor in selecting and setting up an evaluation mechanical system. It is very necessary to test once a month after the basic observation line is established. For high-decibel bearings that are to be lubricated, the frequency should be detected more frequently so that changes that may occur are observed. If a bearing is in a state of destruction, the lubricant can only temporarily cover up the error. However, the decibel intensity will rise quickly to show the existence of the error. In some cases, this phenomenon will appear in a few minutes, while others will take several days.
3. Detection during lubrication
If the decibel of a FAG bearing exceeds the base line by 8 decibels, we believe that this sliding bearing needs lubrication. When we realize that this bearing needs lubrication, knowing when to stop the oil will prevent over-lubrication. This can be done in the following three steps:
  1) Calculate the amount based on the guidance of the bearing manufacturer, then inject the lubricant, not too much. This step is very subjective and has nothing to do with ultrasound, and this step has never failed.
  2) Lubrication technicians use ultrasonic instruments to detect sliding bearings when injecting lubricant. Fill the oil slowly until the decibel strength drops to the baseline.
  3) If there is no basic line as a guide, the amount of lubricating oil should be stopped when the sound is lowered and then rises. At this time, the technician should stop using the lubricant.
4, ultrasonic bearing inspection
Ultrasonic inspection or monitoring is the most reliable way to detect the initial (first) bearing damage. When the temperature rises or the vibration intensity of the low frequency increases, the ultrasonic warning will sound first. This method of inspecting bearings is useful when the sliding bearing is damaged early due to overuse, lack of lubricating oil or excessive lubricant.
5, find the signal of failure
A spherical bearing like a metal on a track, such as a roller or a ball bearing that begins to overuse, undergoes subtle deformation. This situation creates an irregular surface that causes the emitted ultrasound to increase. The change in amplitude from the initial reading indicates one or two conditions: early failure or lack of lubricating oil and initial sliding bearing failure. If the ultrasonic wave exceeds the base line by eight decibels, there is a constant impact noise indicating that the lubricant has failed (dry FAG bearing surface). If the ultrasonic reading exceeds the expected reading and reaches 12 decibels, there will be a crashing noise that can be assumed to have begun to enter the failure mode.

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How to do IKO high temperature bearings for routine maintenance

   High temperature bearings are important moving parts for automobiles. The high temperature shaft is responsible for reducing the frictional resistance during the operation of the chassis and maintaining the normal driving of the car. If the high temperature bearing fails, it may cause noise, IKO bearing heat, etc., especially the front wheel is more obvious, which may lead to dangerous phenomena such as out of control. Therefore, high temperature bearings must be maintained on schedule.
    1. Inspection of high temperature bearings
    (1) When inspecting the tightness of the IKO bearing, firstly, the axle of the wheel at one end of the wheel of the vehicle is inspected, and the vehicle is safely framed with a vehicle stool, a wooden cover, and the like.
    (2) Turn the number of wheels to be inspected by hand to see if the rotation is stable and there is abnormal noise. If the rotation is not smooth and there is friction, the brake part is not normal; if there is no noise, the rotation is not smooth and it is loose when it is tight, indicating that the bearing part is not normal. The hub should be removed when the above abnormality occurs.
    For small cars, when checking high-temperature bearings, hold the upper and lower sides of the tires with both hands, and pull the tires back and forth with both hands and repeat them many times. If it is normal, there should be no feeling of looseness and blockage; if the swing has a feeling of looseness, the wheel should be removed.
    (3) Inspection of the brakes. Usually when inspecting high temperature bearings, check the wheel brakes. If there is oil on the inside of the tires, it may be caused by oil leakage from the brake cylinder or brake hose. The cause should be checked and eliminated.
    2. Maintenance of high temperature bearings
    Before disassembling the hub, prepare the wheel hub for maintenance, stop the car and set up the axle to ensure the safety of the maintenance work.
    (1) Remove the decorative cover and dust cover of the hub shaft head;
    (2) Remove the tire nut and tire, taking care not to hurt the thread of the tire bolt. If it is a disc brake, remove the brake and use it to remove the lock ring or lock pin.
    (3) Remove the hub with a special tool;
    (4) Scrape the old grease in the bearing, journal and hub cavity, clean the high temperature bearing and journal with a cleaning agent and wipe dry with a cloth. Finally, wipe the inner cavity of the hub with a cloth.
    (5) Check the high temperature bearing and the bearing race, and find that there are cracks, fatigue peeling and loose bearing rollers. IKO bearings should be replaced. If there is a pitting on the bearing race, the bearing should also be replaced.
    (6) Check the matching between the inner diameter of the bearing and the journal. The matching clearance should be no more than 0.10mm. When measuring the journal, it should be measured in the upper and lower parts of the vertical ground (the largest wear part). If the fit clearance exceeds the specified limit of use, the bearing should be replaced to return it to the normal fit clearance. Do not allow burrs and pitting on the journal to narrow the gap.
    (7) After all the parts meet the requirements, apply the grease to the inner bearing and put it in the wheel hub.
    (8) When applying grease to the bearing inner cavity, be careful to squeeze the grease into the IKO bearing until the grease emerges from the other side of the bearing. Apply a thin layer of grease to the hub cavity and the shaft cap to prevent rust. Be careful not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking.
    (9) Put the hub and outer bearing back on the journal, screw the shaft adjusting nut by hand, and then tighten the adjusting nut with the shaft wrench according to the specified torque. After tightening the nut, turn the hub a few turns to see if the bearing is installed. On the other hand, the bearing and the race are properly matched by rotation. At this time, the IKO bearing is properly tight, and the wheel is free to rotate without feeling an axial gap.
    (10) Finally, the components such as the locking piece, the fixing nut, the tire, the dust cover and the decorative cover are sequentially installed.
    (11) After the high-temperature bearing is adjusted, drive a mileage (about 10km), stop the inspection, use it to wipe the temperature of the hub. If it is hot, it is too tight for IKO bearing adjustment. It should be re-adjusted to properly loosen the bearing tightness.

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