| Abstrakt: |
The article presents an overview of physical, mechanical and operational characteristics of foreign lubricants. In the article presented NLGI and DIN system classifications. The classification of oils and lubricants discussed by the difference between these systems and the peculiarities. Requirements for the quality of lubricants and oils presented according to the NLGI classification. The National Lubricating Grease Institute developed the NLGI classification of lubricants. NLGI developed the automotive oil quality category defined in ASTM D4950 "Standard Classification and Specification for Automotive Service Oils" in collaboration with ASTM International and SAE International. NLGI classification includes the distribution of lubricants by consistency (viscosity or density) and quality categories. The operating temperature requirements and the field of application recommended for lubricants with different degrees of viscosity. The article presents considerable attention to DIN classification systems. The German standard DIN 51502-1990 established a single system for marking and identification of lubricants. The unified classification of lubricants by type, application, consistency, water resistance, maximum and minimum operating temperature, and type of additives included in the grease, allows you quickly and easily to select the lubricant for specific conditions of application, of the mechanism, identify all characteristics by labelling. The standard establishes the classification of lubricants depending on the areas of application, type of dispersion medium, the presence of anti-wear and antifriction additives, fillers, and takes into account their water resistance and temperature range of application. The range of aviation greases of foreign production quite fully are discussed in this paper. The analysis of lubricants of NYCO (France), AeroShell (Netherlands - Great Britain), Royco (United States of America), WEGO (Czech Republic), Expert Oil (Russian Federation) different companies and trademarks presented in this article. The most common and widespread aviation lubricants and their characteristics, operating parameters and endurance limits analyzed and presented in this paper. [ABSTRACT FROM AUTHOR] |
