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China Suppliers XTB Taper Lock Split Bearing Bushings for Wheel Hub - Factory Direct Quality
The wheel hub is a cylindrical metal component that is centrally mounted on an axle and supports the tire. Also called rims, steel rims, wheels, and tire bells. There are many types of wheel hubs depending on diameter, width, molding method, and material.
Evolution of Wheel Hub Bearing Units
In the past, most car wheel hub bearings used single-row tapered roller or ball bearings in pairs. With the development of technology, car wheel hub units have been widely used in cars. The scope and usage of wheel hub bearing units are growing day by day, and it has developed to the third generation:
1st Generation
Composed of double row angular contact bearings, providing the foundational support for modern hub assemblies.
2nd Generation
Features a flange on the outer raceway for fixing the bearing. It can be simply put on the axle and fixed with nuts, making maintenance easier.
3rd Generation
Integrates the bearing unit with an anti-lock brake system (ABS). Designed with inner and outer flanges for secure mounting to the drive shaft and bearing assembly.
Manufacturing Methods for Aluminum Alloy Wheels
There are three primary manufacturing methods for aluminum alloy wheels, each offering different levels of precision, strength, and cost-efficiency:
Gravity Casting
Uses gravity to pour aluminum alloy into the mold. While low cost and high efficiency, it is prone to bubbles and uneven density. Common in early-production models.
Forging Method
Extruded by a thousand-ton press. Offers uniform density, smooth surfaces, and the highest material strength (30% higher than casting). High manufacturing cost due to equipment needs.
Low-pressure Casting
Precision casting at 0.1Mpa. Delivers good formability, uniform density, and high strength while controlling costs. This is the mainstream method for high-quality wheels.
Frequently Asked Questions
What are the different names for a wheel hub?
A wheel hub is also commonly referred to as a rim, steel rim, wheel, or tire bell.
How has the 3rd generation wheel hub bearing improved?
The 3rd generation integrates the bearing unit with the anti-lock brake system (ABS) and features dual flanges for more secure and efficient installation on the drive shaft.
What is the advantage of the forging method for wheels?
Forging provides the highest material strength (over 30% higher than casting), uniform density, and a lighter weight due to the ability to create thinner walls.
Why is low-pressure precision casting the mainstream choice?
It balances high strength and lightweight design with cost control, achieving a high yield rate of over 90% while ensuring a smooth surface and uniform density.
What are the drawbacks of gravity casting?
Gravity casting is prone to internal bubbles (blastic holes), uneven material density, and insufficient surface smoothness compared to precision methods.
How many generations of wheel hub units are there?
Technology has developed through three generations, moving from basic double row bearings to advanced units with integrated flanges and ABS systems.