Seals is to prevent liquid or solid particles in the adjacent joint surface between leak and prevent external impurities such as dust and moisture from entering the machine the parts material or component.
(1) to choose the appropriate sealing material and hydraulic oil, and adapt to the working temperature, the compatibility of products.
(2) and seal the geometry precision of relative sliding parts (bearing). Good quality of material (e.g., hard chromium plating) and finer surface roughness can prolong the service life.
1 is used for hydraulic pump and motor shaft seal is not only the sliding surface roughness within 0.25 m of the Ra, and requirements need to hard chrome plating on the surface, and the oil seal lip flange diameter need appropriate adjustments according to the specific use of and the circumstances. Swing of spring force to make it reasonably close together, and will be used during installation to install the sleeve to protect or gasket sealing ring, make the lips not curly or distortion, resulting in spring sliding out.
The 2 cylinder inner surface usually adopts rolling processing method, not only improve the surface roughness, and the surface cold hardening, is helpful to extend the service life of sealing ring. In addition, the use of pressure, the length and type of sliding surface has a great influence on the service life. Therefore, the time of "check" should be determined according to these conditions.
3 requires sealing surface is in good lubrication condition, in order to prevent the filth from invading as well. Use up to the required cleanliness of the oil and the correct installation method is also the necessary conditions