Car Rubber Materials and Engine Suspension Damping System

With the development of society and industrial technology, the comfort of automobiles has become a core condition for competition among automotive manufacturers, and the design of shock absorbers is key to improving the comfort of automobiles. Shock absorbers are widely used in the engine assembly, chassis transmission system, and suspension system of automobiles. Its main principle is to use the damping motion concept to attenuate vibration energy. Car rubbers shock absorbers are widely used in various shock absorption systems of automobiles due to their low cost, good performance, and convenient maintenance.

Conventional car rubbers shock absorbers

Car rubber has good shock absorption effect, which can effectively protect the damage of vibration sources to surrounding components. Therefore, the rubber shock absorber is widely used in the structure of engine suspension.

In front-wheel drive cars with front-mounted engines, compression and shear structures can be used for car rubbers shock absorbers for engine suspension. When the rubber shock-absorbing parts of the compression and shear structures are under load, they not only bear external compressive forces but also bear shear stress. The engine is supported by three points, using a support form of two points in front and one point in the back. Two rubber shock-absorbing devices are suspended at the front end of the engine, and a wedge-shaped suspension structure can be used. The three-sided stiffness of the wedge-shaped suspension can be freely determined according to space dimensions and angles. This structure can vulcanize the inner and outer metal sleeves with rubber forming together and can achieve a larger ratio of radial and axial stiffness. According to theoretical research, the design of engine shock absorbers based on rubber materials should ensure low dynamic stiffness at high frequencies and high damping coefficients at low frequencies.

Currently, automobile design is moving towards lightweight and economic development, using small, high-power engines and lightweight automobile materials to increase engine vibration excitement and reduce vehicle body stiffness, leading to deterioration of vibration and noise characteristics in the vehicle. Traditional rubber suspensions cannot meet the performance requirements of automobile vibration and noise reduction. Many new types of shock absorber components have emerged for this purpose.

Hydraulic suspension automotive rubbers shock absorber components

In order to effectively ensure that the performance of car rubbers meets the low dynamic stiffness of engine suspension at high frequencies and high damping coefficients at low frequencies, the structure of liquid sealing has been used since 1979. Now this technology is very mature and can be widely used through continuous improvement.

In the early days, the hydraulic suspension of the engine was mainly a single-channel structure. Before the liquid was sealed, its performance was similar to that of general shock-absorbing rubber, and after the liquid was sealed, the hydraulic suspension would undergo compression deformation when subjected to external forces in the low-frequency vibration zone, transmitting the pressure to the liquid, so it has better shock absorption effect at low frequencies. However, if the vibration frequency imposed by the external environment exceeds the inherent frequency of the liquid, the hydraulic suspension dynamic stiffness will increase and cannot meet the demand.

During normal driving of the car, the vibration frequency should be kept as low as possible, which can increase the movement of the movable plate, so that the liquid flows only in the low-frequency channel. Due to the resistance, the channel produces a larger damping coefficient, which is conducive to shock absorption. When the frequency imposed by the external environment exceeds 50Hz, the laminar plates can be increased on the main body to allow the hydraulic movable plate structure to follow the vibration of the main body, stirring the liquid in the chamber, reducing dynamic stiffness, reducing noise, and effectively preventing vibration.