左图是美国约翰超重机上液压油缸中采用的一种新型的油封和防尘刮屑双作用整体式密封件。它与右上图(采用V形密封圈与肪尘圈)和右下图<采用U形密封圈和防尘圈)的装置相比,有以下优点: (1)结构紧凑。(2)活塞杆的支承长度增加。(3)油缸可较短。(4)装拆方便。(5)加工费用减少。(6)降低元 The left is a new type of oil seal and dust-proof shaving double-acting integral seal used in the hydraulic cylinder on John John overweight machine. It has the following advantages compared with the upper right (with V-ring and dust ring) and lower right (with U-ring and dust ring) device, (1) compact structure. (2) Piston rod support length increases. (3) Cylinder can be shorter. (4) easy assembly and disassembly. (5) reduce processing costs. (6) reduce the yuan