| Course Unit Code | 338-0310/06 |
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| Number of ECTS Credits Allocated | 4 ECTS credits |
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| Type of Course Unit * | Compulsory |
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| Level of Course Unit * | First Cycle |
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| Year of Study * | Third Year |
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| Semester when the Course Unit is delivered | Summer Semester |
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| Mode of Delivery | Face-to-face |
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| Language of Instruction | Czech |
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| Prerequisites and Co-Requisites | Course succeeds to compulsory courses of previous semester |
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| Name of Lecturer(s) | Personal ID | Name |
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| DVO31 | Ing. Lukáš Dvořák, Ph.D. |
| Summary |
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Students will learn about friction in industrial practice and the use of lubricants. It is based on sliding and rolling friction in dry friction, mixed and fluid friction. Above all, the properties of liquid lubricants, both Newtonian and Non-Newtonian, are defined and the student is acquainted with the determination of their properties. In addition, sliding pairs and their behavior are defined in different friction types, the student is acquainted with the Stribeck diagram. Possible types of lubrication are listed - individual, circular, central. Finally, the methods for detecting the degradation of lubricants and methods of their variation or regeneration are presented.
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| Learning Outcomes of the Course Unit |
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Students will learn about types of friction, they can characterize dry, limiting, fluid and mixed friction.
They can define sliding pairs and their behavior in different types of friction. Students will understand the nature of the lubrication and lubrication function. They will familiarize themselves with the types and properties of lubricants. Particular attention is paid to rheological properties of lubricants.
They know the different types of lubrication and types of lubrication devices and lubrication systems and learn how to select the right type of lubrication device for a specific case.
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| Course Contents |
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Lectures:
1st Basic terms: Tribology, Tribotechnics. Lubrication - friction - wear: relations. Division of lubricants. Lubricants and their properties: viscosity, viscosity dependance on temperature and pressure, compressibility, lubricity.
2nd Lubricants and their properties: the rheology of lubricants, consistency, penetration. Rheometers.
3rd Modes of friction and lubrication. Stribeck chart. Types of wear. Increase of wear with time.
4th Sliding pair on dry friction and boundary lubrication. Bearing materials.
5th Sliding pair o fluid and mixed-friction lubrication. Plain bearings. Stick-slip.
6th Friction, wear and lubrication of rolling bearings.
7th Lubrication systems and devices: classification, description, properties, applications. Components of lubrication systems.
8th Calculations of lubrication systems.
9th Degradation of lubricants. Thermo-oxidative stability. Tribotechnical diagnostics of oils.
Exercises:
1st Physical properties of lubricants: viscosity, temperature dependence.
2nd Measurement of fluid viscosity and rheograms of grease.
3rd Measurement of pressure loss in the flow of grease - Programme No.1 - Part I
4th Calculation of pressure loss in pipes, comparing the measured and calculated values - Program 1 – Part II. Programme No.1 – max. 20 points.
5th Dry friction - boundary lubrication – Fluid friction: examples.
6th Calculation of Bearing - hydrodynamic axial and radial.
7th Calculation of Bearing - complete. Entering the Programme No. 2 Design lubrication system. Programme No.1 - max. 15 points.
8th Work on Program 2, and consultation.
9th Repetition, consultation, test: max 65 points.
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| Recommended or Required Reading |
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| Required Reading: |
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Mang, T. Bobzin, K. Bartels, T. Industrial tribology : tribosystems, friction, wear and surface engineering, lubrication. Online. Dostupné z
Neale, M.J. , Tribology handbook, online: http://www.sciencedirect.com/science/book/9780750611985 |
ŠŤÁVA, P., PAVLOK, B. Mazací technika. Ostrava: VŠB – TU Ostrava, 2006. 76 s. ISBN 80-248-1000-X.
BEČKA, J. Tribologie. Praha: Vydavatelství ČVUT, 1997. 212 s. ISBN 80-01-01621-8 |
| Recommended Reading: |
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| Szeri, A.Z. Tribology : friction, lubrication, and wear. Washington : Hemisphere Publishing Corporation, 1980. 548 p. ISBN 0-07-062663-4 |
ŠAFR,E. Technika mazání. Praha: SNTL, 1970. 381 s.
ŠŤEPINA,V., VESELÝ,V. Maziva v tribologii. Bratislava: Veda, 1985. 406 s.
JANOUŠEK,F., KOZÁK,J., TARABA,O. Technická diagnostika, Praha: SNTL, 1988. 429 s.
ŠŤÁVA, P., KOZUBKOVÁ, M. Aplikovaná mechanika tekutin, Ostrava: VŠB – TU Ostrava, 1995. 102 s.
SCHRAMM, G. Reologia. Podstawy i zastosowania. Poznaň : OWN PAN, 1998. 272 s. ISBN 83-85481-63-X.
MANG, T. BOBZIN, K. BARTELS, T. Industrial tribology: tribosystems, friction, wear and surface engineering, lubrication. Dostupné z
ŠPONDR CMS. Typy centrálních mazacích systémů. dostupné z
SKF. Mazací systémy. Dostupné z
Další studijní opory nalenete na katedrálních stránkách http://www.338.vsb.cz/studium/studijni-opory/
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| Planned learning activities and teaching methods |
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| Lectures, Tutorials, Experimental work in labs, Project work |
| Assesment methods and criteria |
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| Task Title | Task Type | Maximum Number of Points
(Act. for Subtasks) | Minimum Number of Points for Task Passing |
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| Graded credit | Graded credit | 100 | 51 |