In this paper, the stress and strain of the O-type sealing ring moving back and forth between piston and hydraulic vat are analyzed, so the frictional force of the O-type sealing ring can be obtained.

• 对液压缸内作往复运动的活塞上的O形密封圈进行应力和应变分析，从而确定O形密封圈引起的摩擦力的大小.