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.  

Effect of Ecological Oils on the Quality of Materials of Hydraulic Pump Components

2013 ◽  
Vol 801 ◽  
pp. 1-6 ◽  
Author(s):  
Radoslav Majdan ◽  
Zdenko Tkáč ◽  
Rudolf Abrahám ◽  
Bohuslav Stančík ◽  
Milena Kureková ◽  
...  
Keyword(s):  
Test Bench ◽  
Mineral Oil ◽  
Technical Diagnostics ◽  
Special Test ◽  
Hydraulic Pump ◽  
Cyclic Pressure ◽  
Loss Of Weight ◽  
Different Types ◽  
Material Wear

This paper presents the effect of three oil types on the quality of hydraulic pumps after testing on a special test bench. The quality of material of hydraulic pump components was evaluated on the basis of its wear. In the special test bench, hydraulic pumps were loaded by cyclic pressure with different oil types. There were tested a mineral oil-based liquid HV and two biodegradable types, i.e. a vegetable oil-based liquid HETG and polyalphaolefin oil-based liquid HEPR. The wear level of hydraulic pumps was evaluated on the basis of flow efficiency and the weight and roughness of internal components. Laboratory scales were used to measure the weight of hydraulic pump components. Results of measured roughness and weights ​​have been graphically compared. We noticed the most significant material wear on bearings and slide plates. The highest loss of weight was observed in the hydraulic pump tested with the ecological oil HETG. The highest loss of flow efficiency (7.3 %) was measured with the same oil type. This paper shows differences in the wear of hydraulic pumps after testing with different types of oils on the basis of selected methods of technical diagnostics.

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.

An Analysis of Hydraulic Fluid Wear Performance Discrimination Based on a Statistical Evaluation of a Standard Vane Pump Test

2005 ◽  
Author(s):  
Richard T. Dixon ◽  
Jamie Clare ◽  
Maggie Wenham ◽  
Ronald Bakker
Keyword(s):  
Recent Work ◽  
Statistical Evaluation ◽  
Global Solutions ◽  
Mineral Oil ◽  
Hydraulic Fluid ◽  
Vane Pump ◽  
Wear Performance ◽  
Factors Affecting ◽  
Hydraulic Fluids ◽  
Pump Test

This paper discusses recent work at Shell Global Solutions’ laboratory to investigate the factors affecting vane pump test wear measurements made using mineral oil hydraulic fluids.

scholarly journals Measurement of flow characteristics of a gear hydraulic pump by simulating the operating load of the tractor’s hydraulic system

2021 ◽  
Vol 338 ◽  
pp. 01010
Author(s):  
Ľubomír Hujo ◽  
Juraj Jablonický ◽  
Sylwester Borowski ◽  
Jerzy Kaszkowiak ◽  
Matej Michalides
Keyword(s):  
Laboratory Test ◽  
Physical Properties ◽  
Hydraulic System ◽  
Flow Characteristics ◽  
Operating Conditions ◽  
Test Equipment ◽  
Working Fluid ◽  
Maximum Pressure ◽  
Hydraulic Pump ◽  
Data Set

The results of the work include research on changes in flow characteristics of gear hydraulic pump QHD 17 by simulating operating conditions on laboratory test equipment with assessment of influence of transmission-hydraulic fluid MOL Farm NH Ultra on technical and operational properties of hydraulic pump QHD 17. The laboratory test equipment makes it possible to repeatedly simulate real conditions under which the hydraulic system of the agricultural tractor operates, or to simulate the load with maximum pressure. By monitoring the change in the flow of the hydraulic pump at precisely determined intervals, which were 0 and 125 hours worked, the influence of the physical properties of the working fluid on the flow properties of the hydraulic pump was assessed and the measured data set was evaluated by mathematical-statistical analysis. Based on the physical properties of the tested MOL Farm NH Ultra fluid, which were determined from the samples taken at precisely determined intervals, no negative effect of the fluid itself as well as its properties on the flow efficiency of hydraulic pump QHD 17 was found.

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 The comparison of biodegradable hydraulic fluid with mineral oil on the basis of selected parameters  

2011 ◽  
Vol 57 (Special Issue) ◽  
pp. S43-S49 ◽  
Author(s):  
R. Majdan ◽  
J. Kosiba ◽  
J. Tulík ◽  
D. Kročková ◽  
V. Šinský
Keyword(s):  
Mineral Oil ◽  
Technical State ◽  
Hydraulic Fluid ◽  
Test Results ◽  
Hydraulic Systems ◽  
Operational Conditions ◽  
Two Fluids ◽  
Working Performance ◽  
Agricultural Tractors ◽  
Agricultural Tractor

The paper presents a comparison of two fluids quality. The first one was mineral oil type UTTO which is commonly used in the transmission and hydraulic systems of agricultural tractors. The second one tested was biodegradable hydraulic fluid type ERTTO which could replace the toxic mineral oil. Both fluids were tested under the same test conditions using a special test device. The selected parameters of the hydrostatic pump were evaluated. The tests were evaluated according to the parameters describing the technical state of the hydrostatic pump as follows: flow efficiency, decrease of flow efficiency and cleanliness level of the fluid tested. This additional measurement verifies the test results. On the basis of the results achieved, we can state that the biodegradable hydraulic fluid exerts no harmful influence on the technical state of the hydrostatic pump. Therefore, the biodegradable fluid tested can be applied to the agricultural tractor. Has been demonstrated that the selected parameters are suitable for the evaluation of hydraulic fluid during its working performance. Therefore, these parameters will be used in the next examination of the fluid under operational conditions of an agricultural tractor.

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.

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.

Investigations of Road Wear Caused by Studded Tires

2014 ◽  
Vol 42 (1) ◽  
pp. 2-15
Author(s):  
Johannes Gültlinger ◽  
Frank Gauterin ◽  
Christian Brandau ◽  
Jan Schlittenhard ◽  
Burkhard Wies
Keyword(s):  
Traffic Safety ◽  
Test Bench ◽  
Operating Conditions ◽  
Test Method ◽  
Analytical Models ◽  
The Road ◽  
Driving Speed ◽  
Major Factors ◽  
Tire Friction ◽  
Variable Operating Conditions

ABSTRACT The use of studded tires has been a subject of controversy from the time they came into market. While studded tires contribute to traffic safety under severe winter conditions by increasing tire friction on icy roads, they also cause damage to the road surface when running on bare roads. Consequently, one of the main challenges in studded tire development is to reduce road wear while still ensuring a good grip on ice. Therefore, a research project was initiated to gain understanding about the mechanisms and influencing parameters involved in road wear by studded tires. A test method using the institute's internal drum test bench was developed. Furthermore, mechanisms causing road wear by studded tires were derived from basic analytical models. These mechanisms were used to identify the main parameters influencing road wear by studded tires. Using experimental results obtained with the test method developed, the expected influences were verified. Vehicle driving speed and stud mass were found to be major factors influencing road wear. This can be explained by the stud impact as a dominant mechanism. By means of the test method presented, quantified and comparable data for road wear caused by studded tires under controllable conditions can be obtained. The mechanisms allow predicting the influence of tire construction and variable operating conditions on road wear.

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