One-way piston sealing ring for large-diameter or heavy-load oil cylinder

The utility model provides a one-way piston sealing ring for a large-diameter or heavy-load oil cylinder, and relates to the technical field of piston sealing. The one-way piston sealing ring for thelarge-diameter or heavy-load oil cylinder comprises an abrasion-resistant ring connected with the inner wall of a hydraulic cylinder in an abutting mode and an elastic ring embedded in a piston, the abrasion-resistant ring is fixedly connected with the elastic ring, the vertical section of the elastic ring is square, and a sealing lip is arranged on the side, facing the inner wall of the hydrauliccylinder, of the abrasion-resistant ring. By arranging the square elastic ring, the problem that the sealing ring is prone to torsion when a piston combined sealing piece is installed or the piston rod bears heavy pressure is solved. 本实用新型提供了一种用于大直径或重载油缸的单向活塞密封圈，涉及活塞密封技术领域。其中一种用于大直径或重载油缸的单向活塞密封圈，包括与液压缸内壁抵接的耐磨圈和嵌设在活塞内的弹性圈，所述耐磨圈与弹性圈固定连接，所述弹性圈的竖截面为方形，所述耐磨圈朝向液压缸内壁的一侧设置有密封唇。本实用新型实现了通过设置方形的弹性圈，解决活塞组合密封件安装时或者活塞杆承受重压时密封圈容易发生的扭转问题