Most of the car wheel bearings are used in single row conical roller or ball bearings in pairs. With the development of technology, the car wheel hub unit has been widely used in cars. Hub bearing units are used more and more widely, and now they have developed to the third generation: the first generation is made up of double row angular contact bearings. The second generation has a flange on the outer raceway to fix the bearing. It can simply fit the bearings onto the axle and fix them with nuts. Making the car easier to maintain. The third generation wheel hub bearing unit adopts the combination of the bearing unit and the anti lock brake system ABS. The hub unit is designed with an inner flange and an outer flange, and the inner flange is fixed on the drive shaft with bolts, and the outer flange is installed together. Worn or damaged hub bearings or wheel hub units may cause inappropriate and costly failure in the course of your vehicle running, and even cause harm to your safety. In the use and installation of hub bearings, please pay attention to the following items:
1, in order to maximize the safety and reliability, no matter how long they suggest you should always check the age of car hub bearing - bearing is early warning signal: including any wear friction noise when rotating or hanging combination wheel when cornering speed is not normal. For rear wheel drive vehicles, it is recommended that the front wheel hub bearings be lubricated when the vehicle runs to 38000 km. When replacing the brake system, check the bearing and replace the oil seal.
2, if you hear the wheel bearing parts of the noise, first of all, it is important to find the location of the noise. There are many moving parts that may produce noise, and there may be contact between some rotating parts and non rotating parts. If the noise in the bearing is confirmed, the bearings may be damaged and need to be replaced.
3, because the front wheel hub causes the working conditions of the two side bearings to be similar, so even if only one bearing is broken, it is also recommended to replace in pairs.
4, hub bearings are sensitive, in any case need to adopt the right method and appropriate tools. In the process of storage and installation, the bearing parts can not be damaged. Some bearings require greater pressure entry, so special tools are needed. Be sure to refer to the instructions of the automobile manufacturing.
5, the installation of bearings should be clean and tidy environment, fine particles into the bearing will also shorten the service life of bearings. It is very important to keep a clean environment when changing bearings. Do not allow the use of percussion hammer bearing, bearing attention do not fall on the ground (or similar misconduct). The condition of shaft and bearing seat should be inspected before installation, even minor wear will lead to bad fit, which will lead to early failure of bearing.
6, for hub bearing units, do not attempt to disassemble the hub bearing or adjust the seal ring of the hub unit, otherwise the sealing ring will be damaged, leading to the entry of water or dust. Even the raceway of the sealing ring and inner ring is damaged, resulting in permanent failure of the bearing.
7, there is a magnetic thrust ring in the sealing ring of the bearing with ABS device. The thrust ring can not be collided, impacted, or collided with other magnetic fields. Remove from the packaging box before installation, so as to keep them away from the magnetic field, such as motors or power tools. When the bearings are installed, the operation of the bearing can be changed by observing the ABS alarm needle on the instrument panel through the road condition test.
8, with ABS magnetic thrust ring hub bearings, in order to determine the thrust ring installed on which side, you can use a light small thing near the edge of the bearing, the magnetic force of the bearing will attract it. When installing, one side of the magnetic thrust ring is pointing to the inside, and the sensitive element is facing to the ABS. Note: incorrect installation may result in failure of the brake system.
9, many bearings are sealed, this kind of bearing does not need to add grease in the whole life cycle. Other non sealed bearings, such as double row tapered roller bearings, must be lubricated with grease when installed. Because of the size of the bearing cavity, it is difficult to determine how much oil, the most important thing is to ensure that there is grease in the bearing, if the grease is too much, when the bearing rotates, the excess grease will ooze. General experience: during installation, the total amount of grease should be 50% of the clearance of the bearings. 10, the installation of locking nut, due to the different bearing type and bearing seat, the torque difference is very large.