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The Difference Between Wheel Bearing And Wheel Hub Bearing


There is actually a big difference between these two products. Wheel bearing refers specifically to the first generation of press-in bearings, such as double-row angular contact ball bearings and double-row tapered roller bearings. Wheel hub bearing refers to the complete hub unit assembly.

There are significant differences in the structural composition of wheel bearings and wheel hub bearings. The first generation of wheel bearings adopts a split design, which requires the inner ring and outer ring to be pressed separately; while the second and third generation wheel hub bearings use an integrated design to directly integrate components such as the hub and flange into the bearing unit, thereby simplifying the assembly process and improving the reliability and assembly efficiency of the product.


The structural composition of wheel bearings:

Wheel bearings usually refer to the first generation of press-in bearings. Its structure mainly consists of inner rings, outer rings, rolling elements and cages.

The inner ring is designed to fit tightly with the wheel hub, while the outer ring is connected to the steering knuckle. During the assembly process, the inner ring needs to be accurately pressed into the wheel hub, while the outer ring needs to be installed in the steering knuckle by interference fit.

This split design requires high precision and professional skills in the manufacturing and assembly process of wheel bearings.

Double-Row Angular Contact Ball Bearings(HUBI)

The structural composition of wheel hub bearing:

As a representative of the second or third generation of bearing technology, the structure of wheel hub bearing has been significantly optimized and integrated on the basis of the first generation.

In the second generation wheel hub bearing, the wheel hub itself has been integrated into the bearing unit, which means that during assembly, it is no longer necessary to press the inner ring of the bearing into the wheel hub separately, thereby simplifying the assembly steps. However, the connection with the steering knuckle still needs to be achieved by interference fit.

Double-Row Angular Contact Ball Bearings with Outer Mounting Flange (HUBII for Outer Ring Rotation Type)

In the third generation wheel hub bearing, this integrated design has been further improved. The bearing unit not only integrates the wheel hub, but also adds a flange to the outer ring to connect the steering knuckle. This design allows the connection between the bearing unit and the steering knuckle to be completed directly through fasteners such as bolts, which greatly simplifies the assembly process and improves assembly efficiency. In addition, the third generation wheel hub bearing may also integrate advanced components such as ABS sensors, further improving its functionality.

Hub Unit Bearings with End-Cap Type Active Sensor