Hottest air spring components and functions

  • Detail

Air spring: components and functions

high technical background of measurement accuracy

Firestone industrial products company, LLC (FSIP) (hereinafter referred to as Firestone company) has more than 80 years of experience in air spring R & D and manufacturing. The company obtained the air spring product patent for the first time in 1938. Up to now, it continues to carry out research and development to promote the transformation of military technology to civilian technology

at present, most heavy commercial trucks, trailers and buses in North America and Europe are equipped with air suspension, and the demand for air suspension in South America and Asia has been growing. Part of the reason for this trend is that the requirements of the market for commercial vehicles are becoming more and more complex. Vehicles should not only minimize operating costs, but also have high reliability, durability, safety and driving comfort. Compared with the traditional steel suspension structure, the air spring can better meet all the above requirements for vehicles

Firestone Airide ™ In short, the original design concept of the brand air spring is to package the load-bearing air column in a container composed of rubber and cord fabric under the condition of following the structural principle of the tire. Cord fabric can support the strength of air pressure, while rubber can prevent air leakage and provide a protective shell

in the past decades, the design of air spring has been continuously improved. In essence, there is a certain difference between membrane air spring and rotary surface air spring. The original design was to adopt the structure of rotating surface, which is still widely used in some fields. Because membrane air springs can meet the different requirements of various vehicles and only need to adjust the corresponding piston structure, membrane air springs are widely used in commercial vehicles at present. The cylindrical structure of the air spring can ensure its strong flexibility, which is crucial to improve the vehicle's handling performance, driving performance, durability and driving comfort

the material of the air spring itself is a decisive factor. The pressure change inside the air spring will produce extremely high temperature, so the synthetic materials used need to have excellent thermal conductivity. Firestone products use the highest quality heat-resistant natural rubber. At the same time, rubber also needs to have good oil resistance, grease resistance, dirt resistance and ozone resistance. Even sunlight will affect the durability of rubber

The geometry of the air spring is also very important. The sealing membrane needs to be able to maintain the measured air volume under different pressures. By adjusting the thickness of the membrane wall, the comfort and durability can be maximized. Generally speaking, thinner wall thickness can bring faster and smoother response time and better driving comfort, but it will also affect the durability of the film to a certain extent. The strength of the rubber film can be increased by adding a fiber layer. The linear structure in the fiber layer can be woven along the axial direction (meridional direction) or cross structure can be used for weaving. The axial braided structure can reduce the wall thickness, but it usually requires additional restrictions to prevent the airbag from expanding excessively, which will reduce the weight of the new door pedal to be displayed at Chinaplas 2018 International Rubber and plastic exhibition by 40%

the rubber airbag structure helps to form a seal and prevent air leakage. The integrated fiber line strengthens the strength of the air spring, making it able to resist the load caused by changing the air pressure; However, in order to better control the pressure, the air spring needs to be equipped with a piston

the force generated by the impact of road impact wire tensile testing machine or load will cause the air in the compressed air spring of the seal sliding piston. During compression, the rubber bladder rolls on the piston. Once the force disappears and the pressure is released, the air spring can return to the optimal height designed in advance

one of the main advantages of the air suspension system is its automatic leveling function. Mechanical suspension, i.e. leaf springs, cannot provide the best driving experience. Unlike steel substitutes, air springs do not need static spring travel to compensate for load changes, but by increasing or reducing the air pressure in the rubber airbag to keep the vehicle at a constant driving height. This means that the load, air inlet and headlamp position are maintained at standard levels. Additional comfort can be obtained without static spring travel. When the air spring is in the "design state" (that is, when the spring is at the optimal driving height), its natural frequency is much lower than that of the steel spring. The natural frequency of any object is its natural vibration frequency. A lower frequency means a higher degree of comfort for the driver, which in turn has a positive impact on health and productivity

from top to bottom, outer covering layer, second layer line, first layer line, lining

1t air spring assembly

1 Install studs

2 Combined stud (for connecting mounting stud and air joint)

5 Edge plate (permanently crimped on the airbag when leaving the factory, and strict component leakage test shall be carried out before delivery)

6 Rubber airbag

7 Internal cushion (optional) (fail safe device used in most suspension systems)

8 Piston (made of aluminum, steel or fiber reinforced plastic)

9 Piston screw (connecting the piston to the airbag assembly)

rotary surface air spring assembly

3 Dark nut

4 Air inlet (air enters the conical hole of the airbag)

5 Edge plate (permanently crimped on the airbag when leaving the factory, and strict component leakage test shall be carried out before delivery)

6 Rubber airbag

10 Hoop

Copyright © 2011 JIN SHI