Abstract
The temperature of the working fluid has a significant impact on the diagnostic parameters of volumetric hydraulic drives. Reliable control of the technical condition of volumetric hydraulic drives is possible if the temperature of the working fluid is in the standard range. It is necessary to study the processes and causes affecting the temperature change of the working fluid during the testing of volumetric hydraulic drives. (Research purpose) The research purpose is determining through the experiment the amount of thermal energy released during bench tests of new and used domestic and foreign volumetric hydraulic drives. (Materials and methods) For the research, it was used scientific and technical literature, data from domestic and foreign manufacturers of volumetric hydraulic drives, publications and dissertation research for the 2015-2021. (Results and discussion) The rate of increase in the temperature of the working fluid during testing of new volumetric hydraulic drives depends on the pressure in the injection lines and the rotation speed of the hydraulic pump. For used volumetric hydraulic drives, it also depends on the volumetric efficiency. The article presents the calculation of amount of thermal energy released by new and used volumetric hydraulic drives. (Conclusions) In the course of experimental studies, the amount of thermal energy released during bench tests of new and used domestic and foreign volumetric hydraulic drives was determined. The Sauer-Danfoss, GST-112, and Eaton volumetric hydraulic drives that were in operation emit 1.43, 1.6, and 1.61 times more thermal energy than the new ones, respectively. The maximum values of thermal energy released by volumetric hydraulic drives that were in operation, for Sauer-Danfoss is 27491.23, for GST-112 is 12115.53, for Eaton is 10594.72 watts.
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