What is the problem of heating of automobile bridge bearings?

Causes of bearing heating:

1) The bearing fit is unreasonable. The dimensional tolerance of the mating part with the inner bore and outer ring of the bearing, that is, the bearing table and the bearing chamber, is out of tolerance. The size and surface finish of the part that matches with the bearing are the direct factors related to whether the bearing is in good condition, if the size of the bearing table is too large, or the size of the bearing chamber is small, when the bearing is hot-installed, the radial clearance of the bearing will be reduced, so that the bearing is difficult to rotate, resulting in the bearing heating, and in serious cases, the bearing will be locked; If the size of the bearing table is too small, the inner ring of the bearing will be loose when it rotates with the shaft, and the inner ring and rolling elements will rotate, resulting in serious wear of the inner ring and shaft of the bearing, and the vibration and heating failure of the bearing.

2) The bearing installation is skewed. When reprocessing the accuracy of the bearing table or reprocessing the bearing table, the perpendicularity of the shaft bearing block and the end face of the shaft shoulder is not ***, resulting in the deflection or misalignment of the inner and outer rings after the bearing is installed, the rolling element does not roll in the correct position of the bearing raceway, and the raceway is locally overloaded, causing the bearing to overheat.

3) Improper addition of grease. Lubrication is very important in the process of bearing operation, and there is no need to add grease to the double-sided sealed bearing, and the correct use can ensure its normal life. And for the non-sealed bearing, add unclean and excessive grease is the main factor that causes the bearing to heat, in the process of repairing high-speed motors, often encounter such a situation, after the motor assembly finished product test, the bearing temperature rises rapidly, check other parts are not found abnormal, after the secondary decomposition, it is found that the grease inside the bearing and the inside and outside of the small cover is added excessively, after taking out the part, when the assembly test is reassembled, the bearing temperature rise is stable, and the factory requirements are met.

In addition, too little grease is added and the bearing rolling elements are not effectively lubricated, which can also lead to heating of the bearing.

See if the cross knot is rusty, whether it is less oil, and it should be maintained frequently, and then see if the transmission shaft is rubbed to other places, or see if the gearbox is heated, there may be something wrong.

Car bearings are hot, this is a normal phenomenon, there is no problem. Because his bearing needs to rotate and need to work, because the current speed of the car is relatively high, the speed of this bearing is relatively high, including this. The shaft or wide bearing and the brake disc brake pad are all connected, so it will transfer the heat, so the heat is relatively high.

This is a normal phenomenon, there is no problem, every car is like this, you can use it with confidence.

1. The wheels of the car shake when it runs, and the shaking of the whole vehicle intensifies. 2. If the bearing is damaged, there will be abnormal noise. 3. Poor rolling, resulting in a decrease in power. The biggest impact is the intensification of body shake and abnormal noise.

If the car bearing is broken, the car will hear a continuous buzzing sound in the car while driving, and once the wheel bearing is excessively worn, the radial clearance and axial clearance of the bearing will become larger, and the bearing should be replaced at this time.

Symptoms of car wheel bearing damage:

First, the wheels of the car shake when it runs, and the shaking of the whole vehicle intensifies.

Second, the shaft digging is damaged, and there will be abnormal noise.

Third, the rolling is not smooth, resulting in a decrease in power. The biggest impact is the intensification of body shake and abnormal noise. Replacement is recommended.

Here's how to judge:

1. Open the window and listen to see if the sound is coming from outside the car.

2. After increasing the speed of the vehicle (when the buzzing sound is larger), the gear position is in neutral gear to let the vehicle slide, observe whether the noise comes from the engine, if the buzz does not change when coasting in neutral, then most of the scattered ones are the wheel bearings.

3. Temporary stop, get out of the car to check whether the temperature of the wheel axle is normal, the method is: touch the four wheels with your hands, roughly feel whether their temperature is consistent, if the difference is not big, you can continue to drive slowly to the maintenance station.

4. Use the elevator to lift the car (before releasing the handbrake and hanging neutral), when there is no lift, you can use the jack to lift the wheels one by one, and the manpower quickly rotates the four wheels respectively, and when it encounters a problematic axle, it will make a sound, which is completely different from other axles.

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