In recent years, driven by relevant policies, more and more semi trailers have started to install air suspension. Of course, this is also closely related to the performance of air suspension, such as light weight, stability and shock resistance, good comfort, and free lifting.

Air suspension was born in the middle of the 19th century, and went through the development process of pneumatic spring, airbag composite suspension, semi-active air suspension, central inflatable suspension, etc. In the 1950s, air suspension was mature and began to be used in passenger cars, trucks, large passenger cars and railway cars. In some developed countries, especially in Europe and America, the application proportion of air suspension in trucks and semi trailers has reached more than 95%.

No matter in Europe or North America, the air suspension can not open the airbag structure. However, due to differences in road conditions and load requirements, the air suspension they use is not exactly the same. At present, these two types are the main types of air suspension in China.

Let's talk about the American style air suspension first. Its biggest feature is that the guide arm is welded by several steel plates. Generally, it has an "I-beam" design. The appearance looks like a whole. The front support of the American style air suspension is smaller than that of the European style. Therefore, theoretically, the weight of the American style air suspension guide arm will be relatively light. In addition, the guide arm of the American style air suspension has a larger contact area with the axle, which will improve the lateral support performance of the vehicle. Due to its relatively short journey, the airbag is more suitable for use under better road conditions.

The guide arm of the European style air suspension (also known as the German style air suspension) is more like the traditional leaf spring structure, which is generally one or more pieces, directly forged, and has better load-bearing performance. Because the shape of its guide arm can be bent, the air bag has a longer travel and better shock absorption performance. In addition, the leaf spring guide arm itself has good shock filtering performance and is more adaptable to road conditions.

Considering China's national conditions, due to the relatively complex road conditions and heavy load transportation, the application of European style air suspension is relatively more.

The air suspension under Shandong Darong Group is made of brand-new technology, with strong toughness and good sealing performance. It can calmly deal with the impact of bumpy road on the frame, reduce the load and stress. It is a classic European design, with long service life and high bearing strength. With the Darong disc type bridge, the accuracy, deadweight, rigidity, wear resistance, bearing capacity, fatigue resistance, etc. are fully up to standard, which can effectively reduce the loss of goods and improve the operating efficiency.