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China QD Bushing Taper Lock Split Bearing Bush XTB - Quality Wheel Hubs from Leading Suppliers and Factory
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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.
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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:
The first generation: Composed of double row angular contact bearings.
The second generation: Has a flange on the outer raceway for fixing the bearing. The bearing can be simply put on the axle and fixed with nuts, making car maintenance easier.
The third generation: Uses a bearing unit and an anti-lock brake system. Designed with an inner flange (fixed on the drive shaft with bolts) and an outer flange (installs the entire bearing together).
The first generation: Composed of double row angular contact bearings.
The second generation: Has a flange on the outer raceway for fixing the bearing. The bearing can be simply put on the axle and fixed with nuts, making car maintenance easier.
The third generation: Uses a bearing unit and an anti-lock brake system. Designed with an inner flange (fixed on the drive shaft with bolts) and an outer flange (installs the entire bearing together).
🛠️ 1. Gravity Casting Method
Uses gravity to pour the aluminum alloy solution into the mold. After forming, it is processed and polished by a lathe. The process is simple, low cost, and high efficiency, but prone to bubbles, uneven density, and insufficient surface smoothness.
⚒️ 2. Forging Method
The whole aluminum ingot is directly extruded on the mold by a thousand-ton press. Advantages include uniform density, smooth surface, thin wall, light weight, and the highest material strength (30% higher than casting). However, it requires sophisticated equipment and has a lower yield rate (50%-60%), leading to higher costs.
🔬 3. Low-pressure Precision Casting Method
Precision casting under low pressure (0.1Mpa). This method offers good formability, clear outlines, uniform density, and smooth surfaces. It achieves high strength and lightweight while controlling costs with a high yield rate (over 90%), making it the mainstream for high-quality aluminum alloy 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. It is the metal component centrally mounted on an axle to support the tire.
How many generations of wheel hub bearing units are there?
There are three generations. The first uses double row angular contact bearings; the second adds a flange for easier fixing; and the third integrates an anti-lock brake system with inner and outer flanges.
What are the pros and cons of gravity casting for wheels?
Gravity casting is cost-effective and highly efficient but is prone to internal bubbles, uneven density, and a less smooth surface finish compared to other methods.
Why are forged wheels considered superior?
Forged wheels offer the highest material strength (30% more than casting), uniform density, and are lighter with thinner walls, though they are more expensive to manufacture.
Which manufacturing method is most common for high-quality wheels?
Low-pressure precision casting is the mainstream method. It combines high strength and lightweight properties with a high yield rate (over 90%) and controlled production costs.
How is the third-generation wheel hub unit fixed?
The third-generation unit uses an inner flange fixed to the drive shaft with bolts and an outer flange that installs the entire bearing assembly together.