Views:0 Author:Site Editor Publish Time: 2021-03-31 Origin:Site
The suspension is an important component connecting the chassis and the frame. The supporting force, braking force, driving force, etc. of the vehicle are transmitted through the suspension system, and it can also reduce the impact of the harsh road on the vehicle and ensure the stability of the vehicle , Its importance is self-evident. Suspensions are generally divided into independent and non-independent suspensions. For semi-trailers, due to the need for strong load-bearing capacity, all non-independent suspensions are used. There are four common suspensions for semi-trailers.
Steel plate suspension is our common leaf spring, the full name is series-connected leaf spring balance suspension. It is mainly composed of leaf springs, suspension bearings (commonly known as lifting lugs), connecting rods, U-shaped bolts and other parts. The longitudinal force of the car body falls directly on an axle.
The biggest advantage of this kind of suspension is low price, good reliability and convenient maintenance. At present, more than 80% of ordinary semi-trailers in China use steel plate spring balanced suspension.
The most obvious feature of the air suspension is its airbag-type air spring. The air spring itself is lighter, the friction of the air medium in the airbag is small, there is almost no noise when working, and its life is 2-3 times that of the leaf spring. However, when an air spring is used, a rod system that can transmit various forces and moments other than the vertical force must be provided, so the suspension structure is complicated; in addition, the air spring has strict requirements for sealing, and its cost is also high. At present, air suspensions for trailers are mostly high-end fields such as precision instrument transportation, tobacco transportation, and hazardous chemical transportation.
In recent years, a very popular word in the commercial vehicle industry is "lightweight", which is mentioned by domestic manufacturers when new vehicles are released. A very important part of the lightweight body is the suspension. At present, it is more popular to replace the multi-leaf spring structure with a few leaf springs. However, another important factor of the suspension itself is load-bearing, which means that while reducing the number of spring plates, the load-bearing capacity of the body must be taken into account. Therefore, balancing the number of spring plates and load-bearing capacity has become the biggest problem faced by manufacturers.