Abstract:Based on the numerical calculation flow of sealing property coupling of the elastic deformation, hydrodynamics and interference contact, the dynamic seal performances calculation of rectangular elastomeric seal was realized by using Matlab software to program, and the parameters of oil film thickness, leakage and friction were got. The influence of surface roughness on the lubrication state and leakage was analyzed.The calculation results show that when the reciprocating velocity is constant, the lubrication state between sealing part and shift surface is changed from fluid lubrication into mixed lubrication with the increase of sealing ring roughness, and the leakage of sealing is also increased in a geometric, indicating that the roughness of seals has important influence on the serve life and sealing performance of the sealing ring. Reciprocating motion speed is also one of the key parameters that affect seal performance of rectangular sealing ring, when sealing pressure is certain, the critical speed for no leakage is reduced with the increase of sealing roughness.