Volume 18, Issue No.2


Agricultural motor vehicle, disc brake, brake oil, brake application, temperature, heat removal.


Thermal problems of brake system of a heavy duty engine are analyzed in the article. The agricultural motor vehicle is able to travel at 40 kph speed and its weight is 30000 kg. Owing to friction of brake discs, significant amount of heat is released when brake of this vehicle of large weight is applied. For the brake to operate in a reliable way, it is essential to prevent overheating. Design of brake system is described in the article. Description of experiments conducted for inspecting heating and evaluation of results are also included in it. After that, the heat released during brake application is determined. It is also discussed when the brake is operating in a thermally safe way under various conditions of cooling down. The article shows at which temperature damage of cooling oil occurs. This essay means further development of the results described in work [11]. The analysis constitutes part of the project aiming at optimization of wheel body.


Acta Mechanica Slovaca. Volume 18, Issue 2, Pages 28–35, ISSN 1335-2393


  Power Engineering of Brake System of a Heavy ...


[1] Hans Faltin: Engineering Thermodynamics, Műszaki Könyvkiadó, Budapest, 1970.
[2] Dr. Zoltán Benedek, Dániel Hatházi, Endréné Kiss, Dr. Ferenc Konecsny, Dr. Endre Pásztor, István Perjési, Imre Sánta, István Steiger: Engineering thermodynamics and hydrodynamics
II, Tankönyvkiadó Budapest, 1976.
[3] László Imre: Heat transmission in composite structures, Akadémiai Kiadó, Budapest, 1983.
[4] M. A. Mihejev: Bases of calculation of heat transfer in practice, Tankönyvkiadó Budapest, 1990.
[5] Pattantyús’ Manual of Mechanical and Electrical Engineers, Volume 2, Műszaki könyvkiadó, Budapest, 1961.
[6] Dr. William S. Janna: Engineering Heat Transfer, CRC Press LLC, 2000.
[7] Sadik Kakac-Hongtan Liu: Heat Exchangers selection, rating and thermal design, CRC Press LLC, 1998.
[8] K. P. Szeleznyeva: Teplovoe szosztojanie rotorov i cilindrov napovih i gazabin turbin, Thermal condition of rotors and housings of steam and gas turbines, „Machine construction” publishing house, Moscow, 1964.
[9] Jászay Tamás: Engineering Thermodynamics, Addition of Heat, Műegyetemi kiadó, 1994.
[10] K. Ražnjević: Heat engineering charts, Műszaki Könyvkiadó, Budapest, 1964.

[11] Menyhártné Baracskai Melinda: Thermodynamical examination of the oily disc brake of an agricultural motor vehicle, Periodica Politechnica, Transportation Engineering, Budapest. Just being published .
[12] E.Pásztor: The determination of the optimum cool air mass flow of turbine blades at gas turbine aircrafts. M.V.M. Motorna Vozila i motori, International Congress Mot. (2006) Jugoszlavia,Kragujevac. pp.1-2.


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