??Influence of temperature on the small hydraulic seal reliability

??Typically, hydraulic seals made of a polymer material such as rubber, whose design and analysis relates to solid mechanics, tribology, polymer materials, thermodynamics and mechanical manufacturing process and other aspects of the theory of knowledge, generally using finite element software for hydraulic seals Analyse. Hydraulic seal is compressed by the occurrence of large deformation, resulting in stress to achieve the seal of the hydraulic system. To meet the hydraulic seal sealing performance, must be guaranteed to meet the premise of the hydraulic seal shear strength, the maximum contact stress must be at least sealing medium pressure. Many factors influence the hydraulic seal of stress, including the sealing structure parameters such as the compression ratio, the structure size parameters, the contact surface of the friction factor and environmental factors such as the sealing medium pressure and temperature. By finite element model can analyze the factors which influence the performance of the hydraulic seals found the greater the pressure medium, the greater the contact stress and Mises stress;. Draw maximum contact stress hydraulic seal and the shaft with the compression ratio, increases oil pressure increases, but under certain circumstances hydraulic Mises stress is not always increases with the compression ratio of the conclusions;

??Studies have shown that the upper and lower flange open space, the impact of the initial ring compression ratio for maximum contact stress is large, and the sealing groove and notch fillet radius at the bottom shear stress obviously; WORKER analyzes the friction factor influence of shear stress, the greater the friction factor found the greater the shear stress. In practical application, the temperature of the sealing system sealing medium tends to be high and elevated temperatures can cause stress changes in hydraulic seals, hydraulic seals and accelerate relaxation, and therefore affect the reliability of the temperature of the hydraulic seal is very Big.