How long can automobile bearings last? How to determine that the tire bearing is broken?

Maintenance-free hub bearings are widely used in family cars, and the manufacturing technology of hub bearings is getting higher and higher. Moreover, the load of the hub bearing of the ordinary family car is not very large. Under normal use, it may be about10-200,000 kilometers, or even more than 200,000 kilometers.

It is sometimes difficult to distinguish between tire noise and the sound made by hub bearings when you can hear the obvious hum while driving. At this time, we can use lifting equipment to lift the vehicle. After the tire leaves the ground, we can directly listen to the side of the tire, or use a stethoscope to listen to whether the abnormal sound of the wheel hub bearing is obvious, or whether there is a feeling of hairpin when rotating the tire, so that we can well distinguish whether the sound made by the wheel hub bearing is true!

Under the condition of normal speed increase, the noise of hub bearing is related to the vehicle speed, and the faster the vehicle speed, the greater the noise will be. When the hub bearing is damaged and buzzing occurs, the hub assembly can be replaced.

From the car to the bearing, 10 to 15 thousand kilometers is generally used, which is no problem. The most important thing depends on the road conditions you drive. If the vehicle buzzes when driving at a speed of more than 30 kilometers per hour, the higher the speed, the louder the noise. Generally speaking, it can be judged that the bearing is abnormal, and it is necessary to go to a 4S shop or a regular repair shop for car inspection or road test inspection to rule it out.

10 The new Regal has run 240,000 kilometers. At 80,000 km, the right front wheel bearing was damaged and replaced, and the other three wheel bearings were still in normal use. There should be dark quality problems when replacing the right front wheel bearing. The fault phenomenon is that the vehicle is humming when driving. The faster the speed, the louder the sound, which sounds like the sound heard in the cockpit when the plane takes off. This kind of sound is easily mixed with the engine sound. The judgment method is to collect oil after the speed rises. If the sound does not change significantly, it may be a bearing problem. At that time, the car was hoisted during the inspection, and the front wheels were idling, but there was no sound. Probably because the bearing was not seriously damaged, the bearing was not stressed when the car was hoisted, so the fault was not obvious. The repairman turns the tire slowly by hand, and the fault can only be determined if he can hear a slight abnormal sound.

Wheel bearings have no specific service life. Some cars break down after 50,000 kilometers, and some cars may be fine after 200,000 kilometers. Unlike truck bearings, car bearings can be maintained and buttered, and how long they can be used can only be left to fate. In fact, it is very simple to judge whether the bearing is broken. If it is broken, there will be noise when driving, sometimes similar to tire noise. If you distinguish between bearing failure and tire noise, you can drive it back and forth for about 50 yards. There is also a sound that the bearing is broken and the sound has changed or become smaller. This is the tire noise. But I suggest you go to the repair shop and let the master check it!

Hub bearing, a bit awkward to read, do you know what it is? Bearing is a basic part used in industry. Since it is the foundation, its importance is self-evident.

A car has bearings where it rotates, and there are dozens of bearings in the engine gearbox. So what exactly is a hub bearing? Today, my little brother will take you to know this hidden good hub bearing!

1. What is a hub bearing?

Hub bearing is a key part of automobile, which connects tire/brake disc and steering knuckle. Its main function is to bear the weight and provide accurate guidance for the rotation of the hub. Its task determines that it not only bears axial load, but also bears radial load.

Second, the development history of hub bearing

The existence of a thing always has a historical process, so does the hub bearing, and the products of the parts will be constantly updated and iterated to adapt to the application of various machines.

Hub bearing is developed on the basis of other two kinds of bearings, namely tapered roller bearing and standard angular contact ball bearing. It integrates these two sets of bearings into a whole, which makes it have the advantages of light weight, large bearing capacity, good assembly performance, compact structure, omitting clearance adjustment and external hub density. At the same time, it also determines that they will be widely used in automobile parts.

Third, the daily maintenance of hub bearings

Hub bearing maintains the important task of automobile running and undertakes to reduce the friction resistance of chassis running. Daily maintenance is definitely essential. Once the hub bearing fails, it will directly cause various phenomena such as noise and bearing heating.

Removing hub bearing

1. Remove the decorative cover and dust cover of the hub shaft head;

2. Remove the tire without damaging the thread of the tire bolt. If it is a disc brake, remove the brake, and then remove the locking ring or locking pin with a tool.

3. Remove the hub bearing with special tools;

4. Clean up the old grease, clean it with detergent and dry it with a rag. Finally, wipe the bearing cavity with a cloth.

5. Check the hub bearing and bearing race. If cracks, fatigue spalling and loose bearing rollers are found, the bearing should be replaced. If pits are found on the bearing race, the bearing should also be replaced.

6. Check the fit between the bearing inner diameter and the journal. The fit clearance should not be greater than 0.10 mm. When measuring the journal, it should be measured in the upper and lower parts of the vertical ground (here is the most worn part). If the fit clearance exceeds the specified service limit, the bearing should be replaced to restore the normal fit clearance. Burrs and pits are not allowed on the journal to narrow the gap.

7. After all parts meet the requirements, the inner shaft coated with grease can be put into the hub.

8. When applying grease, also pay attention to the amount of grease. It requires you to apply it from one end of the bearing to the other end of the bearing until it comes out. However, don't smear too much in the cavity.

9. Reinstall the hub and the outer shaft to the shaft diameter, tighten the adjusting nut of the shaft head by hand, and then tighten the adjusting nut with the shaft head wrench as required. After tightening the nut, turn the hub left and right several times to see the bearing installation; On the other hand, the bearing and the race are correctly matched by rotation. At this time, the bearing is tight, the wheel rotates freely, and no axial clearance is felt.

10. Finally, install the locking piece, fixing nut, tire, dust cover and decorative cover in turn.

1 1. After the wheel hub bearing is adjusted, drive for a certain mileage (about 10km), stop and check, and wipe the wheel hub temperature by hand. If it is hot, it should be readjusted and the bearing tightness should be relaxed appropriately.

After reading these, I wonder if you know more about this hub bearing? Car maintenance is a continuous activity, and good maintenance at ordinary times plays a great role in safe driving, so the majority of car owners should pay more attention to the daily maintenance of their cars.

This really doesn't have a specific service life, and it has a lot to do with the brands that use environmentally-friendly cars. Generally, after wading, the bearing is not maintained, and it is easy to break down. When the bearing is about to break down, it will buzz first, and the bad one will click badly. When you are shunting, you can't have abnormal noise and stagnation when turning tires, and you can't have a frame.

Under normal circumstances, it is no problem to use bearings for 10 years or 8 years without water or external force. For passenger cars now, the general bearings do not need maintenance. If the bearings are matched, if there are any technical defects or bad brands, they may be broken after two or three years.

At present, the bearings of automobiles are all disposable. If the bearing is broken, it will buzz and make a lot of noise during operation. Lifting the vehicle during maintenance and letting the master turn the wheels to check whether there is any gap is also a safety check!

The service life of automobile wheel bearings depends on whether each tire is dynamically balanced. If the tire is not dynamically balanced, abnormal sound will appear around100000 km and must be replaced. According to my own 30-year driving experience, in the 1990s, because I didn't understand the importance of tire dynamic balance, bearings were rarely replaced above100000 km, and tires had to be replaced when the balance was not around 70000 km but below 80000 km. Now my car is 430 thousand kilometers long, and a pair of front wheel bearings have been replaced for about 380 thousand kilometers, and the rear wheel bearings have been replaced by myself.

Don't confuse tire dynamic balance with four-wheel alignment. Tire dynamic balance can be done in the tire repair gear, but all four wheels should be done. Before replacing a new tire, if you repair the tire later, the tire must be dynamically balanced again.