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Novi Sad, Serbia

Adamovic Z.,University of Novi Sad | Asonja A.,Serbian Academic Center | Stojanovic B.,University of Kragujevac
Journal of the Balkan Tribological Association | Year: 2015

This paper presents the model of diagnosis of the condition in order to maximise the reliability of motor vehicles and their availability to work. The studied model of the reliability condition diagnosis of motor vehicles included the most important parameters of the theoretical and experimental analyses. Analysis of its formation is based on the recordings of total failures of integral components which are in the function of the parameters observed in the condition diagnostics of motor vehicles components. The research included failures that occurred under the influence of increased operating temperatures and worn-out of bearings (stable, flying and sliding) on the crank and camshaft, all in order to provide better insight into the problem. By reliability analysis, we conclude that it is in parallel collusion with authoritative reliability of motor vehicle which is determined and depends on the observed increase in diagnostic parameters: temperature and worn-out of bearings.

Desnica E.,University of Novi Sad | Asonja A.,University of Novi Sad | Mikic D.,Serbian Academic Center | Stojanovic B.,University of Kragujevac
Journal of the Balkan Tribological Association | Year: 2015

The mechanism that is discussed in this study is cardan shaft. The main objective of the proposed and completed research within the presented work was diagnostic of bearing assembly at joints of cardan shafts, which was performed in order to define the overall reliability of shafts. Presented reliability model of cardan shafts is based on an examination of diagnostic size of the bearing assembly on cardan joints. This document presents a difference between reliability of cardan shafts investigated in pure laboratory conditions and those cardan shafts investigated in clean exploitation conditions.

Asonja A.,Serbian Academic Center | Mikic D.,Serbian Academic Center | Stojanovic B.,University of Kragujevac | Gligoric R.,University of Novi Sad | And 2 more authors.
Journal of the Balkan Tribological Association | Year: 2013

On the heavy agricultural tractors MT Z 820 with 60 kW, used in the process of plowing, were examined the basic physical and mechanical characteristics of motor oils of renowned manufacturers in laboratory and exploitative conditions. Motor oils were investigated in exploitative conditions after spending 100 h working in the agricultural tractor engines. Tribomechanical characteristics assessment and evaluating the state of the tested motor oils were carried out based on the criteria used for the applications of lubricants, in order to determine the relations between the results obtained with different oils tested methods and procedures. Tests of basic physical and chemical characteristics of motor oils were carried out in accredited laboratory that meets the standards of ISO / EIC 17025:2006. The aim of this study was to reach the optimum conclusion, by the examination of several types of motor oils in heavy agricultural tractors, which would enhance further the work of the tractor viewed through: better lubrication, better cleaning engines, improved sealing of the engine, better cooling, improved engine protection against corrosion, lower fuel consumption, etc.

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