Abstract
The present article deals with the physical properties monitoring of the transmission-hydraulic fluid, and changes of those properties due the operating load of the hydraulic pump in laboratory conditions. Tests of the transmission-hydraulic fluid were performed in laboratory conditions with the simulation of the operating load, so as to simulate the real conditions under which hydraulic circuit of the agricultural tractors operates. The universal transmission-hydraulic fluid was subjected to analysis, where the samples of the fluid were taken sequentially according to the chosen methodology at intervals of 250 and 500 h. The results of the present article include the evaluation of the physical properties of the fluid and the flow efficiency change of the hydraulic pump after 250 and 500 h of operation, while simulating the operation load. Based on a laboratory test, we found that after working for 500 h, the dynamic viscosity of the examined hydraulic fluid at 40°C decreased by 2.92 mPa.s and at 100°C decreased by 0.64 mPa.s. When determining the kinematic viscosity of the hydraulic fluid after working for 500 h, we recorded its decrease, namely, at a temperature of 40°C by a value of 3.37 mm2/s and at a temperature of 100°C, its value decreased by 0.77 mm2/s. In the analysis of the test oil samples, we found that the level of water contamination of the hydraulic fluid decreases with increasing number of hours worked. Specifically, the water concentration in the hydraulic fluid decreased by 0.031%. At the same time, we recorded a slight decrease in the flow efficiency of the hydraulic pump, specifically by a value of 0.03% after 500 h worked. After working 500 h, we found that the range of abrasion particles in the transmission-hydraulic fluid is within the prescribed range, which is determined by the standard D6595-00.
Highlights
Working fluids are considered as an important indicator of the proper operation of fluid mechanism
Based on the measured data which were obtained during the measurement and the graphical dependence of the average values of flow efficiency as a function of hours worked (Figure 6), it can be stated that the tested working fluid and physical properties of the working fluid do not negatively affect the flow efficiency of the hydraulic pump
Tested hydraulic fluid was evaluated in terms of its effect on the operating parameters of gear hydraulic pump
Summary
Working fluids are considered as an important indicator of the proper operation of fluid mechanism. 875 64.2 10.9 162 236 210 include density, viscosity, temperature dependence of viscosity, point of solidification, compressibility and specific heat capacity of a fluid.[8] Using environmentally degradable working fluids requires an immeasurable concentration of water and a high degree of purity of the oil filing.[9,10] It is for these reasons that the most accurate engineering production of individual elements of the hydraulic system is important, where it is important to monitor the accuracy of CNC machine tools using new methods and trends in product development and planning, where multicriterial diagnostics of CNC machines is important.[11,12] During the test of the universal transmission-hydraulic fluid, were monitored the flow and flow efficiency of the new hydraulic pump, where according to the Jablonickyet al.[13] and Majdan et al.[14] The values of monitored flows and flow efficiency during the measurement are used to create dynamic flow models in hydrostatic transducers.[15,16] Testing itself was mainly focused on the assessments of the physical properties of the tested hydraulic fluid. The test in question was performed under laboratory conditions mainly due to the repeatability and reproducibility of the tests and due to the shortening of the testing time
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