Tag Archives: tyres

333–342 R. Abrahám, R. Majdan and R. Drlička
Special tractor driving wheels with two modification of spikes inclination angle
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Special tractor driving wheels with two modification of spikes inclination angle

R. Abrahám¹*, R. Majdan¹ and R. Drlička²

¹Department of handling and transport machinery, Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr.A. Hlinku 2, SK949 76 Nitra, Slovak Republic
²Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Tr.A. Hlinku 2, SK949 76 Nitra, Slovak
*Correspondence: rudolf.abraham@uniag.sk

Abstract:

The paper presents a research on an improvement of tractor drawbar properties using special driving wheels. Two modifications of the special driving wheels were designed and tested under field conditions. The results were compared with standard tyres. The special driving wheels consists of the tyres with a modified tyre-tread pattern and equips with the spike segments. The special driving wheels allow to activate or deactivate the spike segments to improve a drawbar pull at worse adhesive conditions of the ground or transport on roads with standard tyres. The first modification activates all 8 spike segments at spike inclination angle 90° and the second one 4 at angle 90°and 4 at 30°. The measurements were realised in October 2017 in an area of the Slovak Agricultural Museum in Nitra. The drawbar properties of the special driving wheels were evaluated based on drawbar pull of the test tractor Mini 070 type connected with a load tractor MT8-065 type. Using the test tractor in 1st and 2nd gear, the measurements were realized at 100% wheels slip and repeated 4 times. The results show the statistically significant differences in the drawbar pull of the test tractor with different driving wheels on a grass plot. The highest increase in drawbar pull reached the value 25.56% (2nd gear) and 19.98% (1st gear) in case of the special driving wheels with 4 spike segments at 90° and 4 at 30°. In case of the special driving wheels with 8 spike segments at 90°, increase in the drawbar pull reached the value 10.09% (1st gear) and 15.21% (2nd gear) in comparation with the standard tyres.

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621-633 R. Abrahám, R. Majdan and R. Drlička
Comparison of consumption of tractor at three different driving wheels on grass surface
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Comparison of consumption of tractor at three different driving wheels on grass surface

R. Abrahám¹*, R. Majdan¹ and R. Drlička²

¹University of Agriculture in Nitra, Faculty of Engineering, Department of Transport and Handling, Tr.A. Hlinku 2, SK949 76 Nitra, Slovak Republic
²Slovak University of Agriculture in Nitra, Faculty of Engineering, Department of Quality and Engineering Technologies, Tr.A. Hlinku 2, SK949 76 Nitra, Slovak Republic
*Correspondence: rudolf.abraham@uniag.sk

Abstract:

The paper deals with possibility of reduction of tractor fuel consumption when working on grass surface, and compares use of two versions of spike devices embedded to the original tyre body. The device was designed at Department Transport and Handling (Slovak University of Agriculture in Nitra). Older as well as newer system proposed in 2017 comprises spikes and it is assembled to common tractor tyre tread pattern with auxiliary grooves cut in. Same device can be set to two positions, allowing to work as 8-spikes and 16-spikes system. The spikes are tilted in grooves when moving on paved road. The spikes are ejected out to reduce wheels slip when operated in field. Remaining eight spikes are tilted in case of 8-spikes system. Measurements were realised on grass surface. Tractor Mini 070 type was loaded with heavier tractor MT8-065 type in tests with 3 different driving wheels, balancing the actual weight in all cases. Drawbar pull and fuel consumption were measured in tests, allowing to compute specific drawbar consumption and fuel consumption per hour for three different loads. The results pointed out a fact the tyre slip loss and energy consumption of tractor movement increase at the soil humidity 19.45%. It follows from results achieved that use of both 8- and 16-spikes wheel device versions reduced fuel consumption when cultivating higher humidity soil, preferable for tillage. Eight spikes system with semi-tilted remaining spikes is the most efficient method.

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53-62 J. Čedík and R. Pražan
Comparison of tyres for self-propelled sprayers
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Comparison of tyres for self-propelled sprayers

J. Čedík* and R. Pražan

Research institute of Agriculture Engineering, Drnovská 507, 161 01, Prague 6, Czech Republic; *Correspondence: cedik@vuzt.cz

Abstract:

This article deals with comparison of two types of tyres (MITAS VF and MITAS AC 85) for self-propelled sprayers in terms of their grip properties and effect on soil. The MITAS VF tyre has a new construction allowing it to work with lower inflation pressure and in higher speed than standard tyre. In order to compare the grip properties there was measured dependence of slippage on tractive force. In order to compare the effect on soil there will be measured footprint area of tyre, specific pressure on base (material), compaction of topsoil by means of wire profilograph and penetration resistance of soil by means of penetrometer. The measurement has been taken place on medium-heavy soil, on stubble after wheat cultivation. The MITAS AC tyres showed lesser tread pattern than the MITAS VF tyres. The VF tyres showed also better grip properties and lesser effect on the topsoil. The soil cone index showed statistically not significant difference in comparison with non-compacted soil and it was approximately the same in case of both variants.

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