How much do you know about rear wheel hub bearing ?

The rear wheel hub bearing is the part that connects the tire (rotating part)/brake disc (rotating part) and the steering knuckle (fixing part). Its main function is to reduce the friction force for the rotating pair, and also play the role of transmitting force. It is subjected to very high radial loads (vehicle weight) and axial loads (lateral forces or side impact forces of the tires when turning).

Design points of rear wheel hub bearing
When designing rear wheel hub bearing, the following points are mainly examined:
Interference and Clearance Design, Bearing Strength/Stiffness, Bearing Moment, Bearing Life, Sealing

1. Distinguish the components. Flange linear bearings are composed of multiple components. Especially when installing, multiple components need to be installed together to form the entire system, and the installation position and method of each component are particular. In this case, in order to do the installation work well, it is required to distinguish all the components and not to confuse the components.

Rear wheel hub bearing strength:
Because bearings are subject to very high radial and axial loads, strength is critical. Generally, stress-strain analysis is carried out through CAE, plus a certain safety margin.

rear wheel hub bearing stiffness:
If the stiffness of the bearing is very poor, when the bearing is subjected to lateral force, the flange surface connecting the bearing and the brake disc will be greatly deformed, which will cause problems such as eccentric wear of the friction plate.

rear wheel hub bearing drag torque:
The drag torque of the bearing is the resistance when the bearing rotates, and its magnitude affects the fuel consumption, and for new energy vehicles, it affects the cruising range.

Life of rear wheel hub bearing:
Bearings are maintenance-free for the entire life cycle of the vehicle, so their life must be longer than the life of the entire vehicle. Its life calculation has a very complex calculation formula, which is also the Know-how of different parts suppliers.

rear wheel hub bearing tightness:
It means that the sealing ring prevents external water/dust from entering the inside of the bearing, which affects the lubrication of the steel ball and ultimately affects the life of the steel ball.

How to judge whether rear wheel hub bearing is damaged
To judge whether the bearing of the vehicle is damaged, there are two ways:

Place the vehicle on the lift, spin the wheels vigorously to see if the wheels will stick, and evaluate whether the drag torque of the wheels is normal. If the steel ball is poorly lubricated or out of round, it will lead to increased sticking or drag torque.

During the normal driving of the vehicle, pay attention to whether there is any abnormal noise in the direction of the wheels. If the steel ball is not well lubricated, the first problem that occurs is abnormal noise. If there is no abnormal noise, there is generally no problem.

In addition, since most of the current wheel speed sensor signal sources (magnetic poles or rings) are integrated on the bearing, if there is a problem with the wheel speed signal, the instrument panel will report a fault code, and there will be an ABS fault light as shown in the figure below. Bright.

Therefore, if the ABS fault light is always on, it may also be that the magnetic pole of the bearing is damaged.

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