scholarly journals Greening of Agricultural and Forestry Tractors

2014 ◽  
Vol 62 (5) ◽  
pp. 1135-1139 ◽  
Author(s):  
Zdenko Tkáč ◽  
Ľubomír Hujo ◽  
Juraj Tulik ◽  
Ján Kosiba ◽  
Daniela Uhrinová ◽  
...  
Keyword(s):  
Engine Speed ◽  
Organic Liquid ◽  
Flow Characteristics ◽  
Technical Condition ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Agricultural Tractor

This publication deals with the draft of measurement chain for application of synthetic organic liquid Hydros Uni in agricultural tractor Zetor Proxima 7441. The used organic liquid was evaluated on the basis of its effect on the technical condition of hydrostatic converter UD 20. By the drafted measurement chain, it was performed individual measurements which were realized by specific engine speed and prescribed temperature. Then, the flow values ​​were statistically analyzed. From the obtained results, it could be concluded that the proposed measurement chain meets the requirements for measuring the flow characteristics of liquids. Based on the results show, organic synthetic transmission hydraulic fluid does not negatively affect the technical condition of the tractor hydraulic pump.

Study of the Impact of Synthetic Fluid on the Lifetime of Hydraulic Pump

2013 ◽  
Vol 801 ◽  
pp. 7-12 ◽  
Author(s):  
Ján Kosiba ◽  
Ľubomír Hujo ◽  
Juraj Tulík ◽  
Milan Rašo
Keyword(s):  
Performance Test ◽  
Slovak Republic ◽  
Flow Characteristics ◽  
Science Research ◽  
Joint Stock Company ◽  
Hydraulic Fluid ◽  
Ministry Of Education ◽  
Hydraulic Pump ◽  
Stock Company ◽  
The Impact

This paper deals with the lifetime test of a tractor hydraulic pump. The basic indicator of hydraulic pump lifetime is flow characteristics. This paper presents the results of the performance test of ecological hydraulic fluid. These results were subjected to statistical analysis. Based on these data, it is possible to express a minimum impact of ecological hydraulic fluid on hydraulic pump lifetime. The test was carried out in cooperation between the Department of Transport and Handling (Slovak University of Agriculture in Nitra) and Slovnaft, a.s. (joint-stock company), and supported by the Scientific Grant Agency of the Ministry of Education, Science, Research and Sport of the Slovak Republic – VEGA, ref. No 1/0857/12.

scholarly journals The operation of agricultural tractor with universal ecological oil

2013 ◽  
Vol 59 (Special Issue) ◽  
pp. S27-S33 ◽  
Author(s):  
J. Kosiba ◽  
Z. Tkáč ◽  
Ľ. Hujo ◽  
B. Stančík ◽  
I. Štulajter
Keyword(s):  
Environmental Impact ◽  
Technical Condition ◽  
Operating Conditions ◽  
Hydraulic Pump ◽  
Time Intervals ◽  
Agricultural Tractor ◽  
Lubrication Properties ◽  
Hydraulic Circuits

This contribution presents the results of the research into the characteristics of ecological oil labelled MOL Farm UTTO Synt in the tractor operating conditions. Biodegradable fluid was applied in the gear and hydraulic circuits of the tractor Zetor Forterra 114 41. The fluid was assessed for contamination and lubrication properties by its effect on the wear of tractor hydraulic pump during the application. The hydraulic pump was removed from the tractor at specified time intervals because of its technical condition relating to the flow efficiency. The measurements were calculated as flow efficiency with minimum environmental impact of oil on the hydraulic pump wear.

Hydraulic Laboratory Devices for Testing of Hydraulic Pumps

2014 ◽  
Vol 1059 ◽  
pp. 111-117
Author(s):  
Zdenko Tkáč ◽  
Ján Kosiba ◽  
Ľubomír Hujo ◽  
Daniela Uhrinová ◽  
Ivan Štulajter
Keyword(s):  
Laboratory Test ◽  
Laboratory Tests ◽  
Flow Characteristics ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Negative Effects ◽  
Operational Conditions ◽  
Pump Flow ◽  
Agricultural Tractors ◽  
Hydraulic Circuits

Hydraulic pumps are the most important components of hydraulic circuits in agricultural tractors. Their durability is influenced by flow characteristics and thus the flow efficiency. This paper presents the laboratory test of an ecological synthetic hydraulic fluid of UTTO type. This fluid is currently under development. In terms of a decrease in hydraulic pump flow efficiency, laboratory tests of these fluids did not show negative effects of its application. It can be stated that after completion of laboratory tests, it will be needed to continue with trials under operational conditions.

scholarly journals Evaluation of tractor biodegradable hydraulic fluids on the basis of hydraulic pump wear

2013 ◽  
Vol 59 (No. 3) ◽  
pp. 75-82 ◽  
Author(s):  
R. Majdan ◽  
Z. Tkáč ◽  
J. Kosiba ◽  
R. Abrahám ◽  
J. Jablonický ◽  
...  
Keyword(s):  
Test Bench ◽  
Flow Characteristics ◽  
Mineral Oil ◽  
Operating Conditions ◽  
Hydraulic Fluid ◽  
Test Results ◽  
Hydraulic Pump ◽  
Cyclic Pressure ◽  
Hydraulic Fluids ◽  
Evaluation Parameters

Two types of biodegradable hydraulic fluids (HEES and HEPR) with the mineral oil-based hydraulic fluid (HV) were compared. The tests were performed using a test bench. During the tests with a tractor hydraulic pump, the fluids were loaded by a cyclic pressure load. The tests of fluids were evaluated on the basis of wear of the pump. Evaluation parameters were the flow characteristics of the pump and the cleanliness level of tested fluids. The temperature of the fluid under which the test was performed was measured in real operating conditions of the Zetor Forterra 11441 tractor. It is possible to state upon the test results that the mineral oil-based fluid was classified in the first place, the biodegradable fluid of the HEPR type in the second place, and the biodegradable fluid of the HEES type received the last position.  

Investigation of degradation of ecological hydraulic fluid

2021 ◽  
pp. 095440622110329
Author(s):  
Z Tkáč ◽  
Š Čorňák ◽  
J Kosiba ◽  
R Janoušková ◽  
M Michalides ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Acid Number ◽  
Hydraulic Fluid ◽  
Chemical Contamination ◽  
Hydraulic Pump ◽  
Total Acid ◽  
Scanning Calorimetry ◽  
Operational Test ◽  
Ir Spectroscopic ◽  
The Impact

This article deals on the impact of the ecological hydraulic fluid type hydraulic environmental ester synthetic oil on operation of mini excavator hydraulic circuit. An operational test was to 500 engine hours. Hydraulic fluid is evaluated for chemical contamination. Fluid samples were taken from the mini excavator at 250 engine hours intervals. These samples were subjected to IR spectroscopic analysis, kinematic viscosity measurements at 40° C and 100° C, total acid number measurement and differential scanning calorimetry. It was found that the ecological hydraulic oil does not influence the operation of the mini excavator. Based on the achieved results, it was shown that the degradation processes during the operational test of the ecological fluid do not affect the operating parameters of the monitored machine. The presented paper also presents the results of the influence of hydraulic on the flow characteristics of the hydraulic pump.

Monopropellant-Driven Free Piston Hydraulic Pump for Mobile Robotic Systems

2004 ◽  
Vol 126 (1) ◽  
pp. 75-81 ◽  
Author(s):  
Timothy G. McGee ◽  
Justin W. Raade ◽  
H. Kazerooni
Keyword(s):  
Hydrogen Peroxide ◽  
High Temperature ◽  
Thermodynamic Analysis ◽  
Flow Rate ◽  
Power Supply ◽  
Robotic Systems ◽  
Hydraulic Fluid ◽  
Hydraulic Pump ◽  
Free Piston

The authors present a novel power supply for mobile robotic systems. A monopropellant (e.g., hydrogen peroxide) decomposes into high temperature gases, which drive a free piston hydraulic pump (FPHP). The elimination of fuel/oxidizer mixing allows the design of simple, lightweight systems capable of operation in oxygen free environments. A thermodynamic analysis has been performed, and an experimental FPHP has been built and tested. The prototype successfully pumped hydraulic fluid, although the flow rate was limited by the off-the-shelf components used.

Analysis of large-scale flow characteristics in a four-valve spark ignition engine

2002 ◽  
Vol 216 (9) ◽  
pp. 923-938 ◽  
Author(s):  
Y Li ◽  
H Zhao ◽  
N Ladommatos
Keyword(s):  
Flow Field ◽  
Velocity Fluctuation ◽  
Large Scale ◽  
Engine Speed ◽  
Flow Characteristics ◽  
Low Frequency ◽  
Length Scale ◽  
Intake Port ◽  
Compression Stroke ◽  
Large Scale Flow

A digital particle image velocimetry (PIV) measurement has been carried out to study the large-scale flow characteristics in a single-cylinder engine with a production-type four-valve cylinder head under one intake port deactivation. The measurement plane was located 12 mm below the cylinder head parallel to the flat piston top. Two-dimensional velocity fields from 100 consecutive cycles were acquired at every 30 crank angle interval in the compression stroke to analyse ensemble-averaged mean velocity, cyclic variation of the swirl motion, low-frequency and total velocity fluctuations and their integral length scales. The analysis shows that as one intake port is deactivated, strong swirl forms at the end of the intake stroke and sustains its flow pattern up to the late stage of the compression stroke with the precessing of the swirl centre. Both swirl ratio and swirl centre show significant cyclic variations in the compression process. A low-frequency component with spatial frequency below 0.05 mm-1 (corresponding to a large-scale structure with a spatial scale over 20 mm) is absolutely predominant in the flow field and therefore the low-frequency large-scale flow behaviour determines the basic characteristics of the total in-cylinder flow. The flow field is considerably anisotopic because the integral length scale of any velocity fluctuation components along any direction is different. However, the velocity fluctuation field in the horizontal plane will gradually become homogeneous as the piston moves up in the compression stroke. The integral length scale is in the range of 4-10 mm at an engine speed of 600 r/min. When the engine speed is doubled, flow velocity in the cylinder nearly doubles and velocity fluctuation kinetic energy more than triples though the flow pattern hardly changes.

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