On May 11, 2015, the “ 2015 Beijing International Road Transport, Urban Bus and Parts Exhibition †was opened at the Beijing National Convention Center. The reporter saw two companies exhibiting "air springs" exclusively at the show. One is Continental and the other is Weibak . In contrast, in the domestic truck market, almost 80% of the heavy trucks are equipped with a four-point suspension system in the cab, in which the air spring suspension accounts for a large part, and the air spring suspensions of the frame and the trailer are under development. But there is a phenomenon worthy of our attention in recent years, high-end heavy truck trailer has generally started using air spring suspension, such as China's heavy truck on display at the 2015 Shanghai International Auto Show's high-end brand Shantou Deca has air spring suspension 11 air bags The system thus shows that air spring suspensions or will be the future trend of trucks.
ContiTech Air Spring System Booth 
Weibak Commercial Vehicle Air Spring System Booth
So, what is the reason why the application of the domestic air spring suspension system is still under development in the truck market? In recent years, the rapid economic development of China has accelerated the process of urbanization, which has led to an increase in the demand for various materials and the drive for road transport. In order to maximize the benefits, some drivers ignore the regulations and safety, and the problem of overloading and over-limitation is serious. Due to the material advantages of the leaf spring suspension itself, the strength is large, and the overload capacity is stronger. Compared with the air suspension, the price is lower, and it is loved by users. From this point of view, the manufacturer has to adapt to the market demand, truck frames and trailers. The widespread design of leaf spring suspensions has become a major factor in suppressing the development of air spring suspensions.
ContiTech Air Spring System Display
Air springs can be divided into three types: bladder type, membrane type, and composite type. The four-point air suspension in the cab and the trailer lift airbag use the bladder air spring. The diaphragm spring is mainly used in the design of the shock absorber of the car. The compound type is mainly used on heavy-duty trailers and large passenger cars. The air spring is filled with compressed air in a sealed container, using the gas compressibility to achieve its elasticity.
Weibak Capsule Air Springs 
Weibake Composite Air Springs
In practical applications, the air spring suspension obviously has many advantages over the leaf spring suspension. First, the air spring suspension is more conducive to the lightweight design of the vehicle, which can effectively reduce fuel consumption, save the use cost, and reduce the weight of the truck. It is more conducive to the reduction of carbon dioxide emissions and contributes to the sustainable development of the city. Secondly, vehicles equipped with air suspension can effectively reduce the vibrations generated during the driving of the vehicle and significantly reduce the impact and damage to the road surface. This will reduce the frequency of road maintenance, save material, and reduce dust pollution; in addition, the design of the air spring suspension will be effectively combined with the vehicle's NVH (noise, vibration, noise and vibration roughness), compared to the leaf spring suspension. Greatly reduce the vibration and noise of the vehicle to ensure the driver's driving comfort, and the four-point suspension of the cab can also improve the safety of driving. When the vehicle crashes while driving, the cab will translate a distance. , reduce the impact force; air spring has more ideal nonlinear elastic characteristics, after installing height adjustment device, The height of the body will not change with the increase or decrease of the load, and the spring stiffness can be designed to be lower. It is understood that the service life of the air spring suspension is generally more than 5 years, and the leaf spring is likely to be replaced in two years because some vehicles are often overloaded. Once, easy to use, stable and reliable performance, but due to the complex structure, the price is higher. However, based on the advantages of air spring suspension, domestic high-end heavy trucks have already adopted air suspensions.
National laws and regulations are gradually perfecting, and law enforcement efforts are gradually increasing. With the increasingly stringent management of overloaded and overloaded vehicles, air suspensions have obviously had a vast space for development. It is understood that Qinghai Province has implemented the policy of overloading the limit and persuasion. Only in April 2015, a total of 2,588 vehicles were convinced to suppress overruns. The persecution policy was gradually implemented across the country; Zhengzhou’s efforts were even greater, and the overload limit was not only fine but also fine. Withholding points, if the violation of the law exceeds 3 times within one year, the vehicle operation certificate will be revoked, and if the road transport enterprise exceeds the total number of freight vehicles of the unit by more than 10% within one year, the road transportation management organization shall order it to suspend business for rectification; If the circumstances are serious, its road transport business license shall be revoked. All regions of the country are now strictly managing the overload limit, and drivers will pay more attention to safety and comfort when they do not benefit more. Some countries in Europe, for example, even have policies. If air spring suspensions are used to overload 10%, air suspensions are widely used in Europe. It can be seen that the development of parts and policies is closely related. Under the influence of domestic regulations and policies, the application of air spring suspensions on heavy trucks will also become more and more common. The spring of air springs is approaching.
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