(一) 液压缸是液压传动中的关键部件,在中高压液压系统中都应用厚壁液压缸。设计时需要计算缸体壁厚和校核简体内壁上的最大合成应力。至今,缸体强度的计算都是取远离缸底和法兰端的筒体部份,按厚壁圆筒的强度理论进行计算的。可是,在很多文献中,有的推荐采用第二强度理论(最大延伸变形理论), (A) hydraulic cylinder hydraulic transmission is a key component in the high-pressure hydraulic system are thick-walled hydraulic cylinder. The design needs to calculate the cylinder wall thickness and check the maximum composite stress on the inner wall. So far, the calculation of cylinder strength is taken away from the bottom of the cylinder and the flange of the cylinder part, according to the theory of thick-walled cylinder strength calculation. However, in many literatures, some recommend using the second strength theory (maximum extension deformation theory)