The main hub bearing is a rotary bearing and precise guidance of the hub, both axial load and radial load, is a very important component.
1. Trend SUMMARY
1, developed before
wheel bearings mounted in the car wheel hub members, the hub bearing performance is improved wheel, hub bearing by the early development of two single row tapered roller bearings to the double row tapered roller bearings and double row angular contact ball bearings, and bearing from a simple development of the bearing core of the hub bearing unit.
2, Structure and Composition Characteristics
The first generation hub bearing
The two single row tapered roller bearings, the main function is to support wheel rotation, must be adjusted to ensure that the bearings have a reasonable clearance during installation;
the second generation hub bearing
the double row tapered roller bearing or a double row angular contact ball bearing consisting of hub bearing unit, inner bearing grease for added performance and installation units of formula,No need to adjust the clearance of the bearing unit;
Third-generation hub bearing unit
The main structure of the product with two flange structure double row angular contact ball bearings, wherein a flange car wheel suspension coupled with a further coupling flange, mechatronics hole coupled with the drive shaft, the bearing unit with synchronous speed and high-performance disk sensor, a signal acquisition unit cars ABS system, is a high-tech products;
the fourth generation hub bearing unit
wherein a sleeve or jacket with the inner shaft member as a whole, compared with the third generation of more compact structure, third and fourth generation hub bearings mainly used for cars with ABS system, is the development trend of high-end cars and high-end commercial hub of the wheel bearing. Installation and maintenance
2 of the hub bearing
1, note that the bearings of wear of the early warning signal: comprise any frictional noise during rotation or suspension in combination wheel abnormal deceleration during cornering.
2, and the storage hub bearing mounting process, to protect the bearing member, must reference to automobile manufacturing specifications, use special tools to install.
3, the proposed replacement for the bearing pair, one side of the problem, for a variety of reasons, there is another side integrity question, it is replaced as a precautionary method.
4, in order to ensure long bearing life, should be carefully checked before installation of the shaft and housing, but avoid tapping with hard objects bearing.
5, for the hub bearing unit, do not attempt to dismantleHub bearing seal opening or adjusting the hub unit, otherwise it would cause damage to the seal ring into the water or dust. Even ring and the inner ring raceways are damaged, causing permanent failure of the bearing.
6, when attached to a magnetic ABS wheel hub bearing thrust ring, with the ring of magnetic thrust side inside, is sensitive to components of the ABS. If you are unsure which side of the thrust ring on, you can use a light little thing near the edge bearing, magnetic bearings produced will attract it, or not installed properly related to the function of the braking system of play situation.
7, to ensure that the inner magnetic thrust bearing device equipped with ABS seal ring is not subjected to external force, including other field collision impact. When removed before installation of the box, away from magnetic fields. When installing the bearing, the test was observed by a traffic alert ABS dashboard needle to change the operation of the bearing.
8, to ensure that a sufficient amount of bearing grease. For some not sealed bearings, such as double row tapered roller bearing, grease must be added at the time of installation, the seal is not required. Depending on the size of the lumen of the bearing can not determine how much additional oil, if too much fat, when the bearing rotates, the excess will be oozing. General Experience: During installation, the total amount of oil to account for 50 percentage clearance of the bearing.
9, when mounting the lock nut and due to the different types of bearing housings, torque vary greatly in size. Note reference to the relevant instructions.
10, in order to ensure maximum safety and reliability, regardless of the age of the vehicle is recommended that you should always check how long wheel bearings.
The rear-wheel drive vehicle to the recommended vehicle travels 38,000 kilometers it is to deal with the front hub bearing lubrication. When replacing brake system, check the bearing and replace oil seal.
11, the bearings should be additionally installed when the clean environment, to prevent small particles from entering the bearing shorten bearing life.