• Dizajn u mašinstvu, Semester 3, position 5
• Rail Vehicles, Semester 3, position 5
• Zavarivanje i zavarene konstrukcije, Semester 3, position 5
• Motori SUS, Semester 3, position 5
• Production Engineering, Semester 3, position 5
• Thermal Energy, Semester 3, position 5
• Transportno inženjerstvo, konstrukcije i logistika, Semester 3, position 5

The student attending this course should: • Comprehend the issue and the importance of tribological processes in the most important machine elements (slide bearings, roller bearing, gear pairs, guides, seals, etc.); • Master the calculation methods for tribological elements using the modern lubrication theories; • Make decisions on selection of the type of lubrication and lubricants for lubrication of the major mechanical elements.

Based on the mastered knowledge the student is qualified to: • Recognize the basic parameters that impact the tribological properties of some system, as well as to explain their impact; • Exterminates the basic mechanical systems from the tribological point of view by analyzing the structure of tribological systems; • Propose the solutions for problems originate from the friction and wear process; • Recognize the dominant type of wear in plain and roller bearings, gears, cam mechanisms, elements with linear reciprocating motion and dynamic seals; • Applies methods for the calculation of working and tribological characteristics of considered tribological system; • Select materials, lubricants and lubrication mode for the considered tribological systems.

• Definition of the tribological systems; Tribological characteristics of the mechanical systems. • Bearings – purpose and types; Preliminary selection of bearing types; Reynolds equation. • Sliding bearings (hydrodynamic, hydrostatic, sintered and self-lubricated); Calculation of: friction, minimum lubricant film thickness, lubricant flow, bearing load and oil or surface temperature; Selection of lubricants and lubrication procedures. • Roller bearings; Calculation of: friction, minimum lubricant film thickness and oil temperature; Selection of lubricants and lubrication procedures. • Gear pairs tribology – the influence of lubrication on the reliability and efficiency; Calculation of: friction, minimum lubricant film thickness, oil temperature, etc.; Selection of lubricants and lubrication procedures. • Cam mechanisms tribology – materials and tribological characteristics; Selection of lubricants and lubrication procedures. • Elements with reciprocating linear motion (piston-piston ring-cylinder system, slide ways and guides) – materials and tribological characteristics; Selection of lubricants and lubrication procedures. • Dynamic seals – type, purpose and materials; Calculation of the tribological characteristics; Selection of lubricants and lubrication procedures.

• Lubricants – role, type, classification and basic properties; Rheology of lubricants; Forms and types of lubrication. • Examples for sliding bearings (hydrodynamic, hydrostatic, sintered and self-lubricated) tribological characteristics calculation. • Examples for rolling bearings tribological characteristics calculation. • Examples for gear pairs and cam mechanisms tribological characteristics calculation.

No special requirements.

1. --, Handouts for each lecture. 2. A. Rac, Fundamentals of Tribology, Faculty of Mechanical Engineering, Belgrade, 1991, (in Serbian). 3. A. Rac, Lubricants and Machine Lubrications, Faculty of Mechanical Engineering, Belgrade, 2007, (in Serbian). 4. A. Rac, A. Vencl, Sliding Bearing Metallic Materials – Mechanical and Tribological Properties, Faculty of Mechanical Engineering, Belgrade, 2004, (in Serbian).

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 0
Laboratory exercises: 0
Calculation tasks: 0
Seminar paper: 0
Project: 17
Consultations: 0
Discussion/workshop: 13
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 0
Review and grading of the project: 6
Test: 0
Test: 4
Final exam: 5

Activity during lectures: 5
Test/test: 40
Laboratory practice: 0
Calculation tasks: 0
Seminar paper: 0
Project: 25
Final exam: 30
Requirement for taking the exam (required number of points): 35

D. Dowson, G.R. Higginson, Elasto-hydrodynamic lubrication, Pergamon Press, Oxford, 1977.; T.A. Harris, Rolling Bearing Analysis, John Wiley & Sons, New York, 1984.; R.J. Welsh, Plain Bearing Design Handbook, Butterworths, London, 1983.; W.B. Rowe, Hydrostatic and Hybrid Bering Design, Butterworths, London, 1983.; W.A. Gross (Ed.), Fluid film lubrication, John Wiley & Sons, New York, 1980.