http://www.iaeme.com/IJMET/index.asp 499 editor@iaeme.com International Journal of Mechanical Engineering and Technology (IJMET) Volume 9, Issue 1, January 2018, pp. 499–510, Article ID: IJMET_09_01_054 Available online at http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=9&IType=1 ISSN Print: 0976-6340 and ISSN Online: 0976-6359 © IAEME Publication Scopus Indexed ANALYSIS OF TRIBOLOGICAL CHARACTERISTICS OF THE RADIAL SLIDE BEARINGS Azem Kycyku, Naser Lajqi * , Shpetim Lajqi and Krenar Pllana Faculty of Mechanical Engineering University of Prishtina, 10000 Prishtina, Kosovo *Corresponding author ABSTRACT Machine elements, where tribological phenomena are more pronounced, are slide bearings. Tribology is a science that analyzes friction, wear and lubricate and the mutual action of the surfaces in contact when moving one part of the machine to the other. In this paper the characteristics of the radial slide bearings from the tribological aspect will be analyzed. Since the friction is unavoidable on the sliding bearings, then all the possible impacts will be analyzed in the paper, respectively the analytical expressions and graphic representation of the friction coefficient will be presented, which represents the component by which the best interpretation of this phenomenon. Friction as a tribological characteristic of radial sliding bearings is an unavoidable and undesirable phenomenon. Therefore, our tendency is that this coefficient has the smallest value on these bearings. In the paper, the impacts on friction coefficient are presented in detail, such as the influence of viscosity of the lubricant, normal load, number of rotations, etc. Also in the paper are explained the types of contact surfaces and the analytic expressions for their calculation. Since the viscosity of the oil for lubricant bearings is of particular importance, the effects on this viscosity are analyzed in the paper. Keywords: Slide bearings, friction, wear, dynamic viscosity. Cite this Article: Azem Kycyku, Naser Lajqi, Shpetim Lajqi and Krenar Pllana, analysis of tribological characteristics of the radial Slide bearings, International Journal of Mechanical Engineering and Technology 9(1), 2018. pp. 499–510. http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=9&IType=1 1. INTRODUCTION Friction is part of the science of tribology, defined as a resistance force, which prevents the relative movement between the surfaces in contact and which slide or rotate to one another. Because of the frictional force on the contact surfaces of the machine elements, which is in motion on one another, there appears energy - power loss. These losses of power result in heating and wear of the parts that come in contact.