Abstract
The aim of the scientific contribution is simulating the load of gear hydraulic pump used in agricultural machinery in laboratory conditions, where the impact of ecological transmission-hydraulic fluid on life limit (flow and efficiency) of gear hydraulic pump GHD1-17R is monitored. Laboratory test equipment was used for the simulation. The equipment was used to perform life limit test of hydraulic pump and to monitor changes in physicochemical ecological energy carriers. The simulation in laboratory conditions took 500 hours. The Vickers test took 100 hours. Transmission-hydraulic fluid MOL Farm NH Ultra was used for simulation. The results were that fluid is appropriate to use in this type of hydraulic pump in agricultural machineries. According to the Vickers test, the fluid is characterized by an increased value of flow and efficiency after 50 working hours, thereby exceeding the specified test values.
Highlights
Transmission-hydraulic fluids are an essential part of the hydraulic mechanism
The largest increased in the flow efficiency as a function of the speed rotation is between 500 rpm to 1,500 rpm (8.47 %) after exceeding 1,500 rpm to 2,500 rpm there was an increase in flow efficiency (1.34 %)
The authors state that the given course of flow efficiency is caused by fluid remaining in the tooth gaps of the gear hydraulic pump and with increasing speed the centrifugal force increases, which reduces the losses due to fluid remaining in the tooth gaps, increasing the flow efficiency
Summary
Transmission-hydraulic fluids are an essential part of the hydraulic mechanism. The main function of the fluid is energy transfer, as well as cooling, lubrication and dirt removal. Laboratory test equipment is used to simulate the operating conditions of agricultural machineries, which allows researchers to perform accelerated test of hydrostatic converters and transmission-hydraulic fluids. First of them was performed after 250 and 500 working hours at different rotation speed. The efficiency based on working hours at individual speed rotations was calculated. High requirements are placed on ecological transmission-hydraulic fluid, in terms of quality and in terms of environmental impact. This is a natural consequence of efforts to increase the efficiency of production processes primarily due to a reduction in production cost, reduction in energy
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