KOYO Automotive Hub Bearings

Car hub bearings used to be the most used in pairs of single row tapered roller or ball bearings. With the development of technology, car wheel hub unit has been widely used. The use range and usage of wheel bearing units are growing, and it has now developed to the third generation:

The first generation is composed of double row angular contact bearings.

The second generation has a flange for fixing the bearing on the outer raceway, which can be simply inserted onto the axle and fixed with a nut. It makes car maintenance easier.

The third generation of wheel hub bearing unit is a combination of bearing unit and 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.

The fourth generation hub bearing unit is to make the constant speed universal joint and bearing into a whole, which solves the defect of increasing the size of the hub due to the integrated structure of the hub and the constant speed universal joint in the prior art. The development of the fourth generation hub bearing unit has been successful, and it is believed that it will be widely used in various types of automobiles in the near future.

1. High performance sealing ring

Because the hub bearing is very close to the ground and the high-temperature brake disc and other parts, it is necessary to adapt to various complex road conditions and harsh driving environment. Therefore, the bearing sealing ring must have good anti-leakage performance, and it must also have good heat resistance, mud resistance and sewage performance.

2. Rolling technology

The third generation of hub bearings generally use rolling rolling technology to self-lock the half inner ring. When the rolling rolling technology is used, the axial load causes plastic deformation of the hub spindle end, so that the hub spindle and the half inner ring are connected as one. Compared with the traditional nut fastening, the third generation of wheel bearings using rolling technology helps to reduce the volume and weight, while reducing the cost and improving the reliability of wheel bearings. At the same time, the step of adjusting the position of internal components is eliminated when assembling the car.

3. Lightweight miniaturization

The second and third generation of wheel bearing structure design should be carried out finite element analysis, in order to ensure that the flange has enough rigidity while reducing its volume and weight as much as possible, of which the rigidity of the third generation of wheel bearing is the inclination Angle of the wheel flange relative to the outer ring flange. Through integrated and miniaturized design to reduce the weight of the axle, the second generation of hub bearings has reduced the weight of the first generation by 180g, while the third generation of hub bearings has further reduced the weight of 120g.

4. Low friction torque

The important measure to reduce automobile fuel consumption is to design low friction torque hub bearings, and the main factors affecting the bearing friction torque is the type of bearing and preload, and the bearing seal accounted for a large proportion of the friction torque components. Therefore, improving the seal design to reduce the friction torque can significantly improve the performance of hub bearings. Hub bearings have been developed from the first generation to the latest fourth generation, and the friction torque has been gradually reduced.

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