Reasons for premature bearing damage and preventive measures

The main reasons for premature bearing damage are as follows:

First, improper installation

1. The brute force is used when the bearing is installed. The hammer directly hits the SKF bearing to damage the bearing; it is the main cause of deformation.

2, the installation is not in place, the installation is biased or not installed to the bearing position, resulting in too small bearing clearance. The inner and outer rings are not at the same center of rotation, causing disagreement.

Recommendation: Select an appropriate or professional bearing installation tool, and use a special instrument to detect it after installation.

Second, fatigue

Fatigue damage is a common way of damage to SKF bearings. Common causes of fatigue damage may be: long-term overload operation of bearings; failure to repair in time; improper maintenance; equipment aging.

Recommendation: It is suitable to avoid the bearing being in a high working state for a long time, and can take intermittent work as needed; repair and replace the old SKF bearing.

Third, pollution

Contamination can also lead to premature bearing damage, which means that dust, metal chips, etc. enter the bearing. The main reasons include: opening the bearing packaging too early before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is polluted.

Recommendation: Use the bearings correctly, pay attention to the proper opening time of the package; keep the working environment clean.
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Rolling bearing maintenance needs to pay attention to

In daily car maintenance, we will find that many car owners use butter to lubricate the rolling bearings. In fact, this method is wrong, which will accelerate the early damage of the cross-shaft rolling bearings. Why is this so? What is the correct way to maintain? Today, Asia Fluid Network Xiaobian will answer you one by one.

Because the grease fitting of the universal joint cross-shaft needle bearing is a common grease fitting, because the viscosity of the butter is large, when the grease is used to fill the cavity of the universal joint cross-shaft needle bearing with a grease gun, the butter When entering the narrow inner oil passage, the resistance increases, and the butter pressure rises to overflow the pressure reducing valve opposite the nozzle. This phenomenon can easily be mistaken for the reason why the butter is full.

In fact, the butter does not enter the needle between the needles. When removing the repair, applying the butter to the needle roller and the journal surface may exert some lubrication. Therefore, it is better to use the gear oil lubrication effect. ,This is because:

● Calcium-based grease is a mixture of oil and calcium soap. In use, due to the deterioration and evaporation of lubricating oil, the grease becomes a harder calcium soap. The calcium soap itself can not only play a lubricating role. Moreover, it also hinders the rolling of the needle on the journal, and there is no oil draining measure in the universal joint cross shaft. The deteriorated grease can neither be discharged, and the new oil is difficult to inject, thus greatly accelerating the universal direction. Wear of the cross-shaft needle bearing.

●The needle roller bearing of the universal joint cross shaft can only rotate in the original position during operation, and cannot rotate along the steel bowl and the cross journal. The rolling property of the calcium-based grease is very poor, so the new film cannot be formed immediately after the oil film is destroyed. Oil film.

● The universal joint is subjected to a large torque and alternating load during work, and the oil film of the calcium-based grease is tough, and it is difficult to form a good oil film on the friction surface of the bearing and the journal.

Pay attention when using gear oil. It should be removed after removing the universal joint cross-shaft needle bearing. After removing all the residual grease, put it in the gear oil and soak it for 2min~l0min. In use, it should be noted that the car should be replaced with new oil in time after wading. New oil should be replaced once between 2000km and 3500km. Conditional owners can use special hydraulic filling equipment to regularly lubricate the universal joint cross-shaft needle bearings of the drive shaft.

When we are curing rolling bearings, we only use the correct maintenance method to reduce the occurrence of bearing failures, in order to effectively extend the service life.
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What are the maintenance methods for automotive wheel bearings?

Car wheel bearing maintenance process is:

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 hub 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 hub bearing and the bearing race. If there are cracks, fatigue peeling and loose bearing rollers, the bearings should be replaced. If there is a pitting on the bearing race, the bearing should also be replaced.

6. Check the fit of the inner diameter of the bearing and the journal. The clearance should be no more than 0.1Omm. When measuring the journal, it should be measured in the upper and lower parts of the vertical ground (the largest wear part).

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 inner cavity of the bearing, be careful to squeeze the grease into the 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.

9. Put the hub and outer bearing back on the journal, screw the shaft adjustment 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.

10. Finally, install the locking piece, fixing nut, tire, dust cover and decorative cover.
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What role does the universal joint play?

The universal joint refers to a mechanical structure that utilizes a ball joint to achieve power transmission of different shafts. The universal joint is a very important part of the car. The universal joint is combined with the drive shaft and is called a universal joint transmission. In front-engine rear-wheel drive vehicles, the universal joint transmission is installed between the transmission output shaft and the transaxle final drive input shaft; while the front engine front-wheel drive vehicle omits the drive shaft, universal joint installation Between the axle axle and the wheel, both the drive and the steering. In a universal joint fit, the rotation of one component (output shaft) about its own axis is driven by the rotation of another component (input shaft) about its axis. The universal joint, that is, the universal joint, is a mechanism for realizing variable-angle power transmission for the position where the direction of the transmission axis needs to be changed. It is the "joint" component of the universal transmission of the automobile drive system. The universal joint is combined with the drive shaft and is called a universal joint transmission.

The structure and function of the universal joint is somewhat like the joint on the limbs of the human body, which allows the angle between the connected parts to vary within a certain range. In order to meet the angular changes caused by the power transmission, the steering and the up and down jump caused by the running of the car, the drive axle of the front drive car is connected with the universal joint between the axle and the axle. However, due to the limitation of the axial dimension, the required declination is relatively large. A single universal joint cannot make the instantaneous angular velocity of the output shaft and the shaft into the shaft equal, which is easy to cause vibration, which aggravates the damage of the machine and generates a large noise. Therefore, a wide variety of constant velocity joints are widely used.

In the front drive car, each half shaft uses two constant velocity joints, the universal joint near the transaxle is the half shaft inner joint, and the axle near the axle is the outer half of the axle. In a rear-drive car, the engine, clutch and transmission are mounted as a unit on the frame, and the transaxle is connected to the frame via a flexible suspension with a distance between them that needs to be connected.

The unevenness of the road surface during the running of the vehicle, the load change or the difference between the installation of the two assemblies, etc., will change the angle and distance between the transmission output shaft and the input shaft of the transaxle final drive, so that the rear drive motor The universal joint transmission form uses double universal joints, that is, there is a universal joint at each end of the transmission shaft, which functions to make the angles of the two ends of the transmission shaft equal, and ensure that the instantaneous angular velocity of the output shaft and the shaft input shaft are always equal.
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