Suspension is one of the most important assembly of modern cars and plays an extremely important role in the comfort of the car. Commercial vehicles and passenger cars have very different suspension technologies. What is the future development trend in the commercial vehicle sector? Â
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The main trend is the air suspension
The reporter found through combing, from the history of the development of suspension technology for commercial vehicles in Europe and the United States, at this stage, more than 80% of European and American heavy-duty trucks use air suspension, and almost all of them use air suspension. "Air suspension is the future development trend of China's commercial vehicle suspension. The country is currently doing data collection for policy formulation. After a series of investigations and demonstrations, it will be able to formulate a policy to guide the development of air suspension technology." Luo Zhilong, deputy director of the R&D center of the Automotive Suspension Spring Co., Ltd., said that the current domestic commercial vehicle suspension technology development is based on variable-section leaf springs and high-strength steel plates. Domestic air suspensions for trucks are still small, but the future development trend is certain. Is an air suspension.
In China, the current mainstream technology of commercial vehicle suspension technology is leaf spring suspension. However, the impact of the leaf spring on the road is large, causing serious damage. In addition, the overload of commercial vehicles in China is serious and the degree of damage to the road is exacerbated. The current development of leaf springs has encountered bottlenecks.
Luo Zhilong said that because domestic commercial vehicles are mostly production tools, customers are buying cars at this stage for the purpose of earning money rather than enjoying it. Therefore, commercial vehicle customers are very sensitive to the price of the car, and the cost of buying a vehicle will be considered. After the car is bought, they want to be quick. cover the cost.
According to Du Fengqin, in our country, the price of bicycles with bicycles less than 500,000 yuan is still dominated by leaf springs, while the vehicles with the cost of less than 700,000 to 1 million yuan are air suspensions with a market share of 20%. Trucks have less air suspension because air suspension has higher requirements for highways and its overload performance is relatively poor. At present, these conditions cannot be solved in China. Therefore, the market share of air suspension trucks in China is very small. About 2% to 5%.
Du Fengqin said that the popularization of air suspension technology in commercial vehicles requires the guidance of national policies. The state can formulate preferential policies such as subsidies for the purchase of air suspension commercial vehicles, which will help promote air suspension technology.
Two ways to reduce the weight of commercial vehicle suspension
In the same trend as the suspension technology of passenger vehicles, the suspension technology of commercial vehicles is also reflected in light weight. There are two ways to achieve lightweight. The first is material change. According to Luo Zhilong, there are currently three types of suspension materials that can be used to achieve lightweight, the first is the use of lightweight alloys or lightweight materials, such as some structural parts into aluminum parts can achieve weight loss. The second is non-metallic materials, such as the application of composite materials to some of the annexes. The third is the application of high-strength steels. If the steel plate can be referred to as a 750 megapascal grade from 500 megapascals, in this case, the safety of the steel can be saved, and the body plate can be thinned. Lightweight.
Second, light weight can be achieved through structural changes, and the original bulky structure and numerous components can be changed through the change in the structure of the components. The former workmanship of the split-weld welding was changed to forgings and high-strength castings to transform the original structure to achieve lighter weight.
At present, the share of air suspension in China's commercial vehicle market is still small, but some transport companies have also begun to purchase air suspension trucks. A reporter from the head of a transportation company in Changping, Beijing, learned that due to the need for work, the company has already purchased air suspension models. Air-suspension trucks have better shock absorption and balance, and they can protect the goods by pulling precision instruments or fragile goods. And air suspension models can speed up faster. Ordinary suspension commercial vehicles will experience severe jolts at speeds of up to 90 kilometers, while air suspension technology can increase the speed to 110 to 120 kilometers per hour. The impact on the ground is small, and the vibration generated by the vehicles can withstand Range to improve driving comfort and improve transport efficiency.
Promotion of commercial vehicle air suspension policy is brewing