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Wheel classification


Wheel classification


Wheel hubs on the market can be divided into steel wheel hub and alloy wheel hub according to their materials, with advantages and disadvantages.


The main advantages of steel hub are simple manufacturing process, relatively low cost, and strong ability to resist metal fatigue, which is commonly known as cheap and strong. However, the disadvantages of steel wheel hub are relatively prominent, that is, its appearance is ugly (no wheel hub appearance can be said), its weight is large (the same wheel hub steel material is much heavier than aluminum alloy material), its inertia resistance is large, its heat dissipation is relatively poor, and it is very easy to rust.


Comparatively speaking, alloy wheel hub can make up for such problems. It has light weight, small inertia resistance, high manufacturing accuracy and small deformation when rotating at high speed, which is conducive to improving the straight-line driving performance of the car, reducing the rolling resistance of the tire and reducing the fuel consumption. The thermal conductivity of alloy material is about three times that of steel, with good heat dissipation, which can play a certain role in the thermal attenuation of vehicle brake system, tire and brake system. The alloy wheels of the original cars in the market are mainly made of aluminum alloy. Of course, many modified wheels will choose chromium, titanium and other elements as basic materials in order to meet certain special requirements and improve the vision. However, compared with the steel wheel hub, the price of alloy wheel hub is much more expensive. Therefore, the steel wheel hub will appear in the low-end model in many original cars, and the alloy wheel hub is the standard for the high-end model.


The main advantages of 1 steel hub are simple manufacturing process, relatively low cost and strong metal fatigue resistance. But the disadvantages are also obvious, such as heavy weight, large inertia resistance, poor heat dissipation and so on.


The advantages of alloy wheel hub are light weight, high manufacturing accuracy, high strength, small inertia resistance, strong heat dissipation ability, good visual effect, etc. the disadvantages are complex manufacturing process and high cost.


The alloy wheel hub is mainly made of aluminum with proper addition of manganese, magnesium, chromium, titanium and other metal elements. Compared with steel hub, alloy hub has the characteristics of energy saving, safety and comfort, so more and more cars have listed alloy hub as the standard configuration. Let's take a look at the three characteristics of alloy hub.


1. Energy saving: the alloy wheel hub is light in weight, high in manufacturing accuracy, small in deformation and inertia resistance when rotating at high speed, which is conducive to improving the straight-line driving performance of the car, reducing the rolling resistance of the tire, thus reducing the fuel consumption.


2 safety: the thermal conductivity of aluminum alloy is three times that of steel, and the heat dissipation effect is very good, thus enhancing the braking performance, improving the service life of tires and brake discs, and effectively ensuring the safe driving of the car.


3 comfort: flat tires with alloy wheels are generally used for vehicles with better cushioning and shock absorption performance than ordinary tires, which greatly improves the comfort of vehicles on uneven roads or at high speed.


Some alloy wheels


1. Multi piece alloy hub


There are two-piece and three-piece alloy wheel hubs. Several parts of the wheel hubs are manufactured by forging and spinning processes respectively, and then connected by titanium bolts. These products are light in weight, high in strength and superior in performance, but they are expensive, and are mainly used in various tournaments and luxury cars. In all kinds of car races in the world, no matter the car or motorcycle, under any conditions, it is required that the vehicle speed can be accelerated from zero to 100km / h in a short period of 3S. Therefore, the wheel hub needs to be able to withstand the overload running state due to the extremely high lateral acceleration, extremely high running speed and adverse conditions on the track, as well as the strong wear of tires In this environment, the multi-component aluminum hub has withstood the test of various tough environments. Although the product is light in quality, due to the use of advanced manufacturing technology, the product has high structural strength, and the combination of multiple parts gives people a solid feeling.


2. One piece racing alloy hub


F1 racing car requires the use of one-piece hub. In order to ensure the use performance of the hub and the requirements of vehicle weight reduction, the forging blank is usually used and then produced by spinning process. Compared with the cast alloy hub of the same specification to ensure the high performance and lightest weight of the product, its mechanical properties are improved by more than 18%, and the mass can be reduced by about 20%. The one-piece alloy wheel hub specially designed and manufactured for F1 racing car has withstood the test of various tough environments. However, the alloy wheel hub of passenger car is not as strict as the performance requirements of racing car, and the integral low-pressure casting alloy wheel hub is enough to meet the performance requirements, but the passenger car pays more attention to the appearance modeling and aesthetic design of the alloy wheel hub. Due to the influence of racing and the requirements of energy saving and beauty, the alloy wheel hub of automobile is also changing. The design of large-diameter, flexible and fine spoke alloy wheel hub and lightweight alloy wheel hub with more sense of movement is the main development trend and pursuit direction of the alloy wheel hub of automobile.


3. Built in air alloy hub


In order to reduce the mass of wheel hub to the maximum, a new concept of lightweight alloy wheel hub built-in air alloy wheel hub came into being. This kind of alloy hub can be divided into one-piece type and two-piece combination type. The one-piece built-in air alloy hub makes all the spokes and the inner and outer shoulder of the hub into cavities through cavity technology, which greatly reduces the mass of the hub, and reduces the weight by 20% compared with the same structure alloy hub, while the service performance is greatly improved; the two-piece built-in air alloy hub is The inner shoulder of the hub and rim is made into a cavity, greatly reducing


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