The main function of the hub bearing is to support the load and provide precise guidance for the rotation of the hub. It is a very important component that bears both axial and radial loads. The traditional automobile wheel bearing is composed of two sets of tapered roller bearings or ball bearings. The installation, oiling, sealing and clearance adjustment of the bearings are all carried out on the automobile production line. This structure makes it difficult to assemble in the automobile production plant, high in cost, and poor in reliability. Moreover, when the automobile is maintained at the repair point, the bearings need to be cleaned, oiled, and adjusted. The hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It combines two sets of bearings into one body, has good assembly performance, can omit clearance adjustment, light weight, compact structure, load capacity Large, sealed bearings can be pre-loaded with grease, omit the external hub seal and free from maintenance, etc., and have been widely used in cars, and there is also a trend of gradually expanding applications in trucks.

In the past, the most common hub bearings for cars were single-row tapered roller or ball bearings. With the development of technology, car wheel units have been widely used in cars. The use range and usage of hub bearing units are increasing day by day, and now it has developed to the third generation: the first generation is composed of double row angular contact bearings. The second generation has a flange for fixing the bearing on the outer raceway, which can simply fix the bearing sleeve on the axle with a nut. Makes car maintenance easier. The third-generation hub bearing unit adopts the bearing unit and the 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 hub bearings or hub units can cause unsuitable and costly failures of your vehicle on the road and even cause damage to your safety.

Please pay attention to the following items in the use and installation of wheel bearings:
1. In order to ensure maximum safety and reliability, it is recommended that you always check the wheel bearings no matter how long you are. Pay attention to the early warning signs of bearing wear: including any friction noise during rotation or suspension of the combined wheel turning Unusual deceleration. For rear-wheel-drive vehicles, it is recommended that the front wheel bearings should be lubricated when the vehicle travels to 38,000 kilometers. When replacing the brake system, check the bearings and replace the oil seal.

2. If you hear 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 generate noise, and some rotating parts may come into contact with non-rotating parts. If the noise in the bearing is confirmed, the bearing may be damaged and needs to be replaced.

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