%0 Electronic Article %A Xiaolan Chen %A Guoming Yu %A Jian Fang %A Zean Lv %K annular textured surface %K optimal roughness %K optimal gap %K inner surface %K 45 steel materials %K circular microtexture %K coupling effect %K frictional properties %K equivalent flow method %K cylinder surface %K surface roughness %K roughness optimisation %K coupling relationship %K hydraulic system efficiency %K gap seal hydraulic cylinder %K friction coefficient first decrease %X The circular micro-texture is constructed on the inner surface of the gap seal hydraulic cylinders. The coupling relationship of the surface roughness and micro-texture is studied and solved by the equivalent flow method. At the same time, the tribological experiment is carried out with 45 steel materials commonly used as hydraulic cylinders, and the testing results are compared. The results show that the roughness has a very significant effect on the frictional properties of the annular textured surface. The coupling effect is generated and makes the friction coefficient first decrease and then increase. There are optimal roughness and optimal gap which make the further improvement of the frictional properties on the cylinder surface. This helps to improve the response frequency of the hydraulic cylinder, thereby improving the hydraulic system efficiency. Also, it has positive effects on the improvement of the working efficiency in the hydraulic system. %T Roughness optimisation of textured surface for the gap seal hydraulic cylinder %B The Journal of Engineering %D December 2020 %V 2020 %N 12 %P 1165-1170 %I Institution of Engineering and Technology %U https://digital-library.theiet.org/;jsessionid=fjg041s9xlfo.x-iet-live-01content/journals/10.1049/joe.2020.0182 %G EN