The main function of a hub bearing is to support the load and provide precise guidance for the rotation of the hub. It bears both axial and radial loads and is a very important component. Traditional automotive 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 performed on the automobile production line. This structure makes it difficult to assemble, high cost, and poor reliability in an automobile production plant, and the bearing needs to be cleaned, oiled, and adjusted when the automobile is maintained at a repair point. The hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It integrates two sets of bearings, has good assembly performance, can eliminate clearance adjustment, light weight, compact structure, and load capacity. Large, sealed bearings can be pre-installed with grease, omitting the external hub seal and maintenance-free, etc., has been widely used in cars, there is also a trend to gradually expand the application in trucks.
In order to ensure the maximum safety and reliability, it is recommended that you always check the wheel bearing regardless of the age of the vehicle-pay attention to the early warning signal of wear of the bearing: including any frictional noise during rotation or the suspension of the combined wheel during turning Normal deceleration. For rear-wheel drive vehicles, it is recommended to lubricate the front wheel bearings when the vehicle travels up to 38,000 kilometers. When replacing the brake system, check the bearings and replace the oil seal.
Wheel bearings are more sensitive, and in any case need to use the correct method and appropriate tools. During storage, transportation and installation, the bearing components must not be damaged. Some bearings require a larger pressure to press in, so special tools are required.
Many bearings are hermetically sealed, and they do not need to be greased throughout their life. Other non-sealed bearings such as double-row tapered roller bearings must be greased during installation. Because the inner cavity of the bearing is different in size, it is difficult to determine how much grease is added. The most important thing is to ensure that there is grease in the bearing. If there is too much grease, excess grease will leak out when the bearing rotates.
