Suspension is a force transmission connecting device between the vehicle frame and the axle. Its main function is to transmit the force and torque between the wheel and the frame, buffer the impact force brought by the road to the frame, and ensure the smooth driving of the vehicle.

     Nowadays, more and more semi trailers begin to install air suspension. On the one hand, it is driven by relevant regulations, on the other hand, it is the "tall" performance of air suspension itself.

1. What is the working principle of semi-trailer air suspension?

In fact, the principle of air suspension is not very complex. It is to use the air compressor to form compressed air and adjust the ground clearance of semi-trailer through compressed air. The sensor will collect the ground distance signal and transmit it to the control unit. The control unit judges the change of body height, sends commands to control the compressor and exhaust valve, forms compressed air with the air compressor, and sends the compressed air to the air chamber of the spring and shock absorber to compress or extend the spring to achieve the effect of shock absorption.

2. Advantages and disadvantages of semi-trailer air suspension

advantage:

(1) Light weight. One of the biggest advantages of air suspension is light weight, which is much lighter than the traditional leaf spring suspension, which is also an important reason why ordinary households pay attention to air suspension.

(2) It can be lifted and lowered. First, the axle can be lifted through air suspension, which is conducive to reducing tire wear, especially suitable for working conditions with unilateral venting. Second, the height of vehicle cargo platform can be reduced to a certain extent through air suspension, which is convenient for loading and unloading goods.

(3) Smooth driving. The elastic coefficient of the air spring, that is, the soft and hard of the spring, can be automatically adjusted according to needs. When the vehicle is driving at high speed, the air spring hardens to improve the stability of the vehicle. In case of poor road conditions, the air spring softens to improve the comfort of the vehicle. The adjustment of the air spring can also ensure the constant height of the vehicle, which is conducive to the safety of goods Compared with lightweight, car owners who buy air suspension are more focused on the safety of goods.

Disadvantages:

(1) The price is high. At present, the price of air suspension varies from tens of thousands to hundreds of thousands. There is a large gap between imported and domestic prices. Compared with traditional suspension systems, the price is obviously much higher.

(2) Strict requirements on cargo tonnage. Air suspension vehicles have strict requirements on cargo tonnage. Be careful not to overload when loading. Overload will cause great damage to the air suspension and reduce the service life of the air suspension. Of course, we do not advocate overload.

3. How long is the service life of a set of semi-trailer air suspension?

Generally, the air suspension basically needs to be replaced after 3-5 years of service. For most cars in normal use, the air suspension system can be used for about 5 years. When the road conditions are poor, the service life of the air suspension will be greatly reduced.

Shandong Darong group is a global R & D manufacturer of commercial vehicle axles and parts. It has been deeply engaged in the industry for more than 20 years. Its products cover all kinds of trailer axles, axles and trailer accessories. The products have successfully passed the ISO9001 quality management system certification with stable and reliable performance. The air suspension of Darong group adopts brand-new technology and process, with better toughness, stronger bearing capacity and unique sealing design to ensure working temperature, improve shock absorption performance, prolong service life, reduce vehicle shutdown time and frequency and improve user efficiency.