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Do you know wheel bearings

wallpapers News 2020-03-26

Introduction of wheel bearings

Wheel bearings are one of the key parts of automobiles. Its main function is to carry weight and provide precise guidance for the rotation of the hub. This requires that it can bear not only axial loads but also radial loads.

Development history of wheel bearings

In the past, wheel hub bearings for cars have used single-row tapered roller or ball bearings in pairs. With the development of technology, cars have widely used car wheel units. The use range and quantity of hub bearing units are increasing day by day, and the third generation has been developed.

The first generation consisted of double row angular contact bearings.

The second generation has a flange for fixing the bearing on the outer raceway. The bearing can be simply sleeved on the wheel shaft and fixed with a nut. It makes car maintenance easier.

The third-generation hub bearing unit uses a bearing unit and an anti-lock brake system ABS. 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 installs the entire bearing together.

wheel bearings technology and development trend

High-performance seals

Because the wheel bearing is very close to the ground and high-temperature brake discs and other parts, it needs to adapt to various complicated road conditions and harsh driving environments. Therefore, the bearing seal must have good anti-leakage performance, and must also have good heat resistance, mud, and sewage resistance.

Rolling technology

The third generation of wheel bearings generally uses the self-locking half-inner ring of the rolling technology. When the rolling technology is used, the axial load on the hub causes plastic deformation of the main shaft end so that the hub's main shaft is connected to the half-inner ring as a whole. Compared with the traditional nut tightening, the third-generation wheel bearing adopting the rolling technology helps reduce the volume and weight, at the same time, reduce the cost and improve the reliability of the wheel bearing. At the same time, the steps of adjusting the position of internal components are eliminated when assembling into a car.

Lightweight and miniaturized

Finite element analysis is required in the design of the second and third generation of wheel bearing structures, to ensure that the flange is sufficiently rigid while reducing its volume and weight as much as possible. The rigidity of the third generation of wheel bearings is the hub method. The inclination is of the blue plate relative to the flange of the outer ring. Through the integration and miniaturization design to reduce the weight of the axle, the second-generation hub bearing is 180g lighter than the first generation, and the third-generation hub bearing has further reduced the weight by 120g.

Low friction torque

An important measure to reduce automobile fuel consumption is to design a hub bearing with low friction torque. The main factors that affect the friction torque of a bearing are the type of bearing and the preload. The bearing seal causes a large proportion of the friction torque component. Therefore, improving the seal design and reducing the friction torque can significantly improve the performance of the wheel bearing. The hub bearing has developed from the first generation to the latest fourth generation, and the friction torque has gradually decreased.

ABS technology

ABS is a kind of automobile safety control device with the advantages of anti-skid and anti-lock. It detects the wheel speed during the emergency braking of the car to automatically adjust the braking force to prevent the wheel from locking and shorten the braking distance. The speed is detected by magnetic sensors mounted on the parts that rotate with the wheel and fixed to the car body nearby. The hub unit with the ABS sensor is divided into two cases: one is placed inside the hub, and the sensor is installed on other parts; the other is placed inside the hub together with the sensor (called the hub unit with sensor).

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Tag: wheel   Bearings   wheel bearin