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China Factory Suppliers QD Bushing Taper Lock Split Bearing Bush XTB Bushings for Wheel Hubs
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 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 a foundational support structure for vehicle rotation.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 car maintenance easier.3rd Generation
Integrates an anti-lock brake system. Designed with inner and outer flanges; the inner flange is bolted to the drive shaft while the outer flange installs the entire bearing assembly.
Aluminum Alloy Wheel Manufacturing Methods
1. Gravity Casting
Uses gravity to pour aluminum alloy into the mold, followed by lathe processing. While cost-effective and efficient, it is prone to bubbles, uneven density, and lower surface smoothness.
2. Forging Method
Extruded by a thousand-ton press. Offers uniform density, delicate surfaces, light weight, and 30% higher strength than casting. However, it involves high manufacturing costs and lower yield rates.
3. Low-Pressure Precision Casting
Precision casting at 0.1Mpa. This mainstream method provides good formability, uniform density, and high strength while maintaining a 90% yield rate and controlled costs.
Frequently Asked Questions
What are the different names for a wheel hub?
Wheel hubs are also commonly referred to as rims, steel rims, wheels, and tire bells.
What is the main advantage of 3rd generation hub bearings?
The 3rd generation integrates the anti-lock brake system (ABS) and uses a dual-flange design for more secure and efficient installation.
Why is forging considered the strongest manufacturing method?
Forging uses high-pressure extrusion which creates a more uniform and dense material structure, resulting in strength over 30% higher than traditional casting.
What is the most common method for high-quality aluminum wheels?
Low-pressure precision casting is the mainstream choice because it balances high strength, lightweight design, and cost-effective production.
Are gravity-cast wheels still used today?
Gravity casting was common in early vehicle models, but most modern vehicles have transitioned to more advanced casting or forging methods for better performance.
How does the 2nd generation bearing simplify maintenance?
It features an outer flange that allows the bearing to be easily mounted on the axle and secured with nuts, reducing the complexity of repairs.