Automobile field

In the past, single row tapered roller or ball bearings were mostly used in pairs for wheel hub bearings of automobiles. With the development of technology, car hub units have been widely used in automobiles. The use range and amount of hub bearing units are growing, and now they have developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange on the outer raceway to fix the bearing, which can simply cover the bearing on the axle and fix it with nuts. Make car maintenance easier. The third generation wheel hub bearing unit adopts the bearing unit and anti lock brake system ABS. The hub unit is designed with an inner flange and an outer flange. The inner flange is bolted to the drive shaft, and the outer flange installs the entire bearing together. Worn or damaged wheel hub bearings or wheel hub units may cause inappropriate and costly failures of your vehicle on the road, or even harm your safety. Please pay attention to the following items during the use and installation of the hub bearing:

1. In order to ensure safety and reliability to the greatest extent, it is recommended that you always check the wheel hub bearing no matter how old the car is - pay attention to whether there is an early warning signal of bearing wear: including any friction noise during rotation or abnormal deceleration of the suspension combination wheel when turning. For rear wheel drive vehicles, it is recommended to lubricate the front wheel hub bearing when the vehicle has driven 38000km. When replacing the brake system, check the bearing and replace the oil seal.

2. If you hear the noise from the hub bearing, first of all, it is important to find the location where the noise occurs. There are many moving parts that may produce noise, or some rotating parts may contact with non rotating parts. If it is confirmed that the noise is from the bearing, the bearing may be damaged and needs to be replaced.

3. Because the working conditions of the front hub causing the failure of bearings on both sides are similar, even if only one bearing is damaged, it is recommended to replace it in pairs.

4. The wheel hub bearing is sensitive, and the correct method and proper tools should be used in any case. During storage, transportation and installation, the components of the bearing shall not be damaged. Some bearings require higher pressure to press in, so special tools are required. Be sure to refer to the automobile manufacturer's manual.

5. The bearing should be installed in a clean and tidy environment. The service life of the bearing will also be shortened if small particles enter the bearing. It is very important to maintain a clean environment when replacing bearings. It is not allowed to strike the bearing with a hammer. Pay attention not to drop the bearing on the ground (or the similar treatment is improper). Before installation, check the condition of the shaft and bearing seat. Even minor wear will lead to poor fit, which will lead to early failure of the bearing.

6. For the hub bearing unit, do not attempt to disassemble the hub bearing or adjust the seal ring of the hub unit, otherwise the seal ring will be damaged and water or dust will enter. Even the raceway of the seal ring and inner ring is damaged, resulting in permanent failure of the bearing.

7. There is a magnetic thrust ring in the seal ring equipped with ABS device bearing, and this thrust ring cannot be impacted, impacted or collided with other magnetic fields. Take them out of the packing box before installation, and keep them away from the magnetic field, such as the motor or electric tool used. When installing these bearings, observe the ABS alarm pin on the instrument panel through the road test to change the operation of the bearings.

8. For the wheel hub bearing equipped with ABS magnetic thrust ring, in order to determine which side the thrust ring is installed on, a small light object can be used to close to the edge of the bearing, and the magnetic force generated by the bearing will attract it. During installation, point one side of the magnetic thrust ring inward, facing the sensitive element of ABS. Note: Incorrect installation may lead to failure of the brake system.

9. Many bearings are sealed, and this type of bearing does not need to be greased throughout its life. Other unsealed bearings such as double row tapered roller bearings must be lubricated with grease during installation. It is difficult to determine the amount of grease to be added due to the different sizes of the inner cavities of the bearings. The most important thing is to ensure that there is grease in the bearings. If there is too much grease, the excess grease will leak out when the bearings rotate. General experience: during installation, the total amount of grease should account for 50% of the bearing clearance. 10. When installing the lock nut, the torque varies greatly due to different bearing types and bearing seats.