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Mechanical losses of modern powertrains
Vaňkátová, Kateřina ; Czakó, Alexander (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the issue of mechanical losses in internal combustion engines of passenger cars. The following chapters describe the origin of mechanical losses, the area of their occurrence in the engine and in the accessories driven by the engine. Furthermore, the work summarizes the current knowledge in the field of reducing mechanical losses and methods of determining the engine losses during their development. The aim of this work is to acquaint the reader not only with the issue of mechanical losses, but also with their significant negative impact.
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Mechanical losses of modern powertrains
Vaňkátová, Kateřina ; Czakó, Alexander (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the issue of mechanical losses in internal combustion engines of passenger cars. The following chapters describe the origin of mechanical losses, the area of their occurrence in the engine and in the accessories driven by the engine. Furthermore, the work summarizes the current knowledge in the field of reducing mechanical losses and methods of determining the engine losses during their development. The aim of this work is to acquaint the reader not only with the issue of mechanical losses, but also with their significant negative impact.
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Piston group of in-line four-cylinder gasoline engine
Král, Stanislav ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of the thesis, it is strength control group of ordinary four-cylinder piston gasoline engine. In the first part of the specified thermodynamic, geometric and operational parameters of the motor piston group will calculate the thermodynamic cycle. Furthermore, we see the effects of force acting on the piston group in the most strained moments of the cycle. For the reconstructed load piston group perform voltage control in piston pin and strength control rods of the eye. In conclusion, we compare the calculated values of permissible stress values and find a design safety factor for the part.
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Piston for 50kW 4-stroke SI-engine
Spáčil, Tomáš ; Dundálek, Radim (referee) ; Svída, David (advisor)
This bachelor thesis deals with a primary proportions calculation design of the engine and a constructional piston design for four-stroke spark-ignition engine. It is also contains a design of crank mechanism and engine primary proportions. On the basis of empirical data I projected the piston primary proportions. Furthermore, this thesis deals with the solidity check of critical piston crosscuts according to the crank mechanism.
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Piston of 4-stroke SI-Engine with 75 kW Output Power
Kalugin, Ivan ; Svída, David (referee) ; Dundálek, Radim (advisor)
This bachelor's thesis deals with calculating suggestion and structural solution of a piston for a 4-stroke petrol engine with 75kW output power. The structural solution includes determination basic dimensions of engine and crank mechanism. Final part is devoted to fort control of critical piston sections on the base of kinematics crank mechanism and indicator diagram.
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Powertrain of in-line five-cylinder diesel engine
Zarambukas, Michalis ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of this graduation theses is geometrical and thermodynamic calculation of determined five-cylinder diesel engine and calculation of operation parameters of cylindrical unit and then to compare them with real motor and strike the balance. Other step is to work out thermodynamic cycle and draw the result in p-V diagram. Then to calculate power, effecting on piston which includes proposal of basic proportion of piston and wrist pin, and it follows weigh of piston group and maximal quickening and inertial force of piston group, calculation of specific pressure and pressure in wrist pin. Other purpose is to determine basic proportion for piston rod and to focus on material qualities of con rod eye and bronze case, determination of maximal pressure due to inertial forces comming from gas pressure and security against possible slip and tiredness. At the beginning is described diesel engine from its foundation, its activity to its use in company. At the close are reviewed the results of the calculations.
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Powertrain of experimental single-cylinder spark ignition engine
Laštovica, Karel ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
These bachelor’s thesis deals with experimental single-cylinder engine, calculation of his thermodynamic cycle, design of a piston, design of a can rod eye and his strength check. In introduction there is states function principle of combustion engine and their basic division and application. The bachelor’s thesis consists of five parts: scheduled initiatory parameters, calculation of thermodynamic cycle, calculation of the piston group weight, calculation of forces reacting to piston group and strength check of con rod eye. In the conclusion results of calculation are evaluated.
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