HS code-driven cost variance analysis

List of the catalogue of this article:

• 1、What is the reason for the noise of automobile bearings

Why do car bearings have abnormal noise

1. The reasons for the noise of engine belt pulley bearings are as follows: the key reasons for the whistle of car belts in winter are cold, rubber hardening, loss of elasticity, tensioning wheels and rubber surface slipping. Of course, it is also because the rubber is too hard, the friction force decreases, which increases the slippage and friction noise.

2. The reason for the abnormal sound is poor lubrication or any foreign matter in the bearing. It's also very simple to solve. You need to add grease to the bearing., if there is still a strange sound after adding, it means that the bearing is abnormally worn, and it needs to be replaced at this time.

3. The reasons for the abnormal sound of the left front wheel bearing of the car may be as follows: there is too little oil separation in the bearing, resulting in insufficient lubrication of the bearing groove and steel ball, so the sound of rotation is different and more obvious. The inner ring of the bearing is too tight.

4. The wear gap between the inner ring of the second bearing and the diameter of the shaft is too large, and the third bearing lacks oil causes heat. After the ball 5 runway wear, the gap is too large, which will cause the ball to produce pits and even the ball to be damaged for a long time. The inner diameter of the fourth bearing is too tight with the shaft, and the bearing rotation is not flexible, which will heat up abnormally, resulting in abnormal sounds. .

What are the following reasons for the noise of the main bearing of the engine crankshaft?

1. This is generally caused by the slippage of the belt; there will also be a sharp sound of dry friction of metal parts when the engine is running, which is generally the cause of damage to the bearings of the generator, water pump and steering booster pump; if it is the sound of engine running air leakage, it may be that the exhaust system is blocked and the vacuum tube is leaking. Or the result of fracture.

2. The noise of the main bearing of the crankshaft may have the following reasons: the wear of the bearing and the shaft neck affects the excessive gap; the bolt of the main bearing cover is loose; the main bearing and the seat hole are loose; poor bearing lubrication leads to the erosion of the shaft tile alloy layer.

3. Reason: (1) The spindle tile burned out due to poor lubrication. ( 2) The crankshaft bends due to overload or rotational imbalance. ( 3) The edge anti-push tile anti-pue sheet falls off or wears too much.(4) The bolt of the main bearing cover is loose or the main bearing is accidentally damaged. ( 5) The crankshaft is accidentally damaged due to unbalanced operation and severe overload.

4. The reasons are: the main bearing cover bolt is loose; the radial clearance of the main bearing is too large; the main bearing is poorly lubricated; the main bearing lining tile is burned out; the size of the main bearing lining tile does not match, causing rotation or rupture. When it comes to abnormal noise, it is difficult for ordinary car owners to distinguish which are faulty abnormal noise and which are reasonable abnormal noise.

5, 2 possible reasons. The crankshaft neck and the bearing are too worn, resulting in too large radial clearance; the crankshaft bearing is too long or too short, causing the bearing to break or rotate, and the oil channel and oil hole are blocked, causing the bearing to burn or the alloy to fall off; the crankshaft bearing cover bolt is loose. 3 Diagnostic methods.

What is the reason for the sound of car bearings

1. The reasons for the noise of engine belt pulley bearings are as follows: The key reasons for the whistle of car belts in winter are cold, rubber hardening, loss of elasticity, tensioning wheels and rubber surface slipping. Of course, it is also because the rubber is too hard, the friction force decreases, which increases the slippage and friction noise.

2. The reason for the abnormal sound is poor lubrication or any foreign matter in the bearing. It is also very simple to solve the problem. It is necessary to add grease to the bearing. If there is still a strange sound after adding, it means that the bearing is abnormally worn, and it needs to be replaced at this time.

3. If the car has a "rustling" sound inside the gearbox during driving, and there will be a whistling sound when changing gears, it may be caused by gearbox bearing or gear wear and bearing spots.The abnormal sound of the gearbox when speeding up and shifting may be that the transmission oil contains metal powder, indicating that the gearbox brake belt, clutch and other parts are excessively worn.

4. As long as it is lubricated, no bearing will make abnormal noise. The abnormal sound indicates that the bearing gap is too large, the oil pressure is too low, and the collision direction between the shaft surface and the bearing surface is different. Unlike other bearings, the connecting rod shaft neck has common rotation and self-rotation, and the connecting rod bearing also has common rotation and self-rotation.

Why does the car bearing have an abnormal sound