Hub Bearing: (hub bearing) is an important part of hub bearing, which can bear both axial load and radial load. The traditional automobile wheel bearings are composed of two sets of tapered roller bearings or ball bearings. The installation, oiling, sealing and clearance adjustment of the bearings are carried out on the automobile production line. This structure makes it difficult to assemble in the automobile production plant, high cost, poor reliability, and cars in the maintenance point maintenance, but also the need for cleaning, oiling and adjustment of bearings. The hub bearing unit was developed on the basis of standard angular contact ball bearings and tapered roller bearings, the utility model has the advantages of good assembling performance, omitting clearance adjustment, light weight, compact structure, large load capacity, pre-loading Grease for sealed bearing, omitting outer hub sealing and avoiding maintenance, etc. , in the truck also has the trend of gradually expanding the application. The installation and use of car hub bearings used to be more often used in pairs of single-row tapered roller or ball bearings. With the development of technology, the car has been widely used in the car hub unit. The use of hub bearing units and the use of increasing, now has been developed to the third generation: The advanced generation is composed of double row angular contact bearings. The second generation, on the outer raceway, has a flange for fixing the bearing, which can be simply sheathed to the axle and fixed with a nut. Make it easy to repair cars. The third generation hub bearing unit is equipped with a bearing unit and ABS ANTI-LOCK BRAKE system. 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 holds the entire bearing together. Worn or damaged hub bearings or hub units can cause inappropriate and costly failures on the road and even harm your safety. In the use and installation of hub bearings, please pay attention to the following matters: 1. In order to ensure safety and reliability to a greater extent, it is recommended that you always check the wheel, no matter how old the car is, hub bearings -- notice whether the bearings are wearing early warning signs: including any frictional noise during rotation or abnormal deceleration of the suspension assembly during cornering. For Rear Wheel drive vehicles it is recommended to lubricate the front hub bearing at 38,000 km. When replacing the brake system, check the bearings and replace the oil seals. 2. If you hear a noise coming from the hub bearing, first of all, it is important to locate where the noise is coming from. There are many moving parts that may produce noise, or there may be some rotating parts in contact with non-rotating parts. If it is confirmed to be noise in the bearing, the bearing may be damaged and need to be replaced. 3. Even if only one bearing is broken, it is recommended to replace it in pairs because the front hub has similar working conditions that cause bearing failure on both sides. 4. Hub bearings are sensitive and require the right methods and tools in all cases. During storage, transportation and installation, the bearing parts must not be damaged. Some bearings require greater pressure to be pressed in, so special tools are needed. Always refer to the automobile manufacturing manual. 5, the installation of bearings should be in a clean and tidy environment, small particles into the bearing will also shorten the service life of the bearing. It is important to maintain a clean environment when changing bearings. Do not use a hammer to strike the bearing. Do not drop the bearing on the floor (or similar mishandling) . The condition of the shaft and housing should also be checked prior to installation. Even minor wear can lead to poor fit and early bearing failure. 6. For the hub bearing unit, do not attempt to open 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 seal ring and inner ring raceway are damaged, resulting in long-term failure of the bearing. 7. The seal ring with the ABS bearing has a magnetic thrust ring that is not subject to impact, impact, or other magnetic fields. Remove them from the box before installation, away from the magnetic field, such as the motor or power tool used. When installing these bearings, change the operation of the bearings by observing the ABS warning pin on the dashboard during road testing. 8. Hub bearings with ABS magnetic thrust rings. To determine which side of the wheel the thrust ring is mounted on, Use a light object * near the edge of the bearing, where the magnetic force generated by the bearing will attract it. One side of the magnetic thrust ring is pointed inward to face the sensing element of ABS. Note: Incorrect Installation may cause the brake system to fail. 9. Many bearings are hermetically sealed and do not require grease for their entire life. Other, non-sealed bearings such as double row tapered roller bearings must be greased during installation. Because of the bearing cavity size, it is difficult to determine how much grease, more important is to ensure that there is grease in the bearing, if too much grease, when the bearing rotation, the excess grease will leak out. General experience: In the installation, the total amount of grease to account for 50% of the bearing clearance. 10, the installation of lock nuts due to the bearing type and bearing seat, the size of the torque varies greatly. Maintenance attention in the maintenance process, often found that some cars have a larger noise, check the tires no abnormal wear and tear, in the lift wheel no obvious abnormal sound. This phenomenon is often caused by abnormal damage to the hub bearing, the so-called abnormal means by the installation of the cause of bearing damage. The front wheel bearings of automobiles are usually double row ball bearings, which are mounted by striking the bearing with a hammer or by pressing the inner ring of the bearing when the bearing is mounted into the housing, will result in damage to one side of the bearing raceway. When the vehicle driving noise, and when the car, the wheel off the ground due to a better side of the raceway, so do not hear obvious noise. The correct installation operation is the key to the long life of the bearing.