HYDRAULIC CYLINDER

摘要

A hydraulic cylinder. A composite sealing system formed by combining an n-shaped sealing ring (5) and a combined sealing element (6) is used for sealing between a piston block (1) and a cylinder body (2) of the hydraulic cylinder, so as to automatically balance the pressure of a working medium. A sealing ring body is pressed from an inner cavity of the n-shaped sealing ring (5) to expand outwards, so as to perform sealing. The higher the pressure is, the better the sealing effect is. With the n-shaped sealing ring being adopted, there is no need to increase the cylinder machining precision and no influence is incurred to working conditions of the combined sealing element in the composite sealing system. Therefore, the hydraulic cylinder has a dual-sealing effect brought by the n-shaped sealing ring and the combined sealing element, and has a low medium leakage, a desirable sealing effect, a long service life and a reliable and stable working condition.