With the development of science and technology, there are more and more kinds of rubber shock absorbers, and their use is more and more extensive. The following outlines the development and application prospects of rubber shock absorbers in their application fields.
2.1 Rubber Shock Absorbers for Automobiles
With the development of society and economy, the domestic and foreign automobiles are changing frequently and the automobile industry is facing a period of rapid change. The development is characterized by ensuring driving safety, riding comfort, high speed and luxury. To further improve the service life of the car. The shock-absorbing products are used to control the vibration and noise of the car and improve its handling stability. They are generally placed in the parts of automobile engine frame, strut devices, suspension bushings, center bearing brackets, jounce limiters and torsional vibration dampers. To improve the safety and comfort of the car. The shock-absorbing products can be divided into four categories: brackets, bushings, buffers, and damping. The main requirements are shock absorption, heat resistance, and fatigue resistance. Automotive shock absorbing rubber products include engine mounts, suspension members, rubber springs, rubber air springs, and collision rubber guards. In recent years, in order to improve the safety, comfort, and operability of automobiles, the variety and number of shock-absorbing rubber products for automobiles have been increasing. For example, the number of shocks absorbing rubber products on a car has reached 50 to 60 pieces.
The engine and transmission operating system use a rubber shock absorber to isolate the vibration of the source. Vibration damping of the transmission part adopts multilateral coupling and damping clutch. The shock absorbers used on the front and rear suspension devices not only have to bear the weight of the vehicle body, but also prevent the body from transmitting vibrations up and down the wheels, suppress the irregular motion of the unsprung mass, and transmit power and braking force. The rubber buffer is one of the important shock absorbers of the vehicle body. The structure of the rubber buffer is a rubber layer sandwiched between two metal plates, and the purpose of buffering is achieved by utilizing shear deformation of the rubber. Recently, a new type of cylinder buffer, which is filled with nitrogen gas and co-existed with a shock absorber oil, has been developed. The feature is to increase the load capacity of the shock absorber (up to 20 MPa), provide good shock absorption, and prolong its service life. The rubber materials used in automotive rubber shock absorbers are based on NR and SBR. In order to improve the heat resistance of the shock-absorbing products, IR, IIR, CR, EPDM, etc. have been used as main materials. Thermoplastic elastomers will also be used for some shock-absorbing products, such as body and chassis shock absorbers.