High performance seal
Because the hub bearing is very close to the ground and high temperature brake discs and other parts, it needs to adapt to various complex road conditions and harsh driving environments. Therefore, the bearing sealing ring must have good anti-leakage performance, and must also have good heat resistance, anti-mud and sewage performance.
Rolling technology
The third-generation wheel hub bearings generally use the rolling technology to self-lock the half inner ring. When the rolling technology is used, the axial load causes the plastic deformation of the main shaft end of the hub, so that the main shaft of the hub and the half inner ring are connected as a whole. Compared with the traditional nut tightening, the third-generation wheel hub bearing using the rolling technology helps to reduce the volume and weight, while reducing the cost and improving the reliability of the wheel hub bearing. At the same time, it eliminates the step of adjusting the position of internal components when assembling into the car.
Lightweight and miniaturized
Finite element analysis should be carried out in the structural design of the second and third generation wheel hub bearings. While ensuring sufficient rigidity of the flange, its volume and weight should be reduced as much as possible. The rigidity of the third generation wheel hub bearing is the hub method. The inclination angle of the flange relative to the flange of the outer ring. Through the integration and miniaturization design to reduce the weight of the axle, the second-generation wheel hub bearing is 180g lighter than the first generation, and the third-generation wheel hub bearing further reduces the weight of 120g.
Low friction torque
An important measure to reduce automobile fuel consumption is to design wheel hub bearings with low friction torque. The main factors affecting the bearing friction torque are the type of bearing and the preload load, and the friction torque caused by the bearing seal accounts for a large proportion. Therefore, improving the seal design and reducing the friction torque can significantly improve the performance of the hub bearing. The wheel hub bearing has developed from the first generation to the latest fourth generation, and the friction torque is obviously gradually reduced.
ABS technology
ABS is a kind of automobile safety control device with the advantages of anti-skid and anti-lock. It automatically adjusts the braking force to prevent the wheels from locking and shortens the braking distance by detecting the speed of the wheels during emergency braking. The detection of the rotational speed is carried out by means of magnetic sensors mounted on the parts that rotate with the wheels and fixed on the vehicle body nearby. The hub unit with 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).