SEARCHING FOR DESIGN PARAMETERS OF CRITICAL PARTS OF FOREIGN VOLUMETRIC HYDRAULIC ACTUATORS

Abstract

The introduction of sanctions by the United States and a number of European Union countries against Russia has led to a reduction in the import of spare parts for the repair of hydraulic equipment. The problem of repairing foreign hydraulic units lies in the complete absence of technical (design) documentation, without which it is impossible to adapt existing domestic maintenance and repair technologies. (Research purpose) The research purpose is searching for the design parameters of important parts of foreign volumetric hydraulic drives. (Materials and methods) Used scientific and technical literature, data from foreign manufacturers of Hydrosila and Eaton chassis drive units, domestic and foreign publications and dissertation research for the period from 2019 to 2022. (Results and discussion) Implemented a comprehensive approach to the search for design parameters of critical parts of foreign-made hydraulic units, including a series of bench tests and dimensional analysis. The bench tests consisted of two stages: the first - a series of one-factor experiments, the second - a multifactorial experiment. Based on the obtained clearance values, the nominal dimensions and permissible deviations of the parts of the resource-limiting joints were calculated using dimensional analysis. The following results were obtained for Eaton hydraulic units: the diameter of the hole in the cylinder block for the piston is 22.5+0.009 millimeters; the diameter of the piston is 22.5+0.009 millimeters; the diameter of the hole in the back cover for the spool is 15.8+0.005 millimeters; the diameter of the spool is 15.8-0.005 millimeters. (Conclusions) The nominal dimensions and permissible deviations of the parts, as well as the values of technological gaps in the resource-limiting connections of Eaton hydraulic units were revealed. The results obtained are of high practical importance for repair production.