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Crank train of a two-stroke automotive engine
Štrba, Matej ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
The subject of this diploma thesis is the analysis and comparison of three-cylinder two-stroke engines with a displacement of 1000 cm3 of the Wartburg 353. The introduction of the thesis is a research that discusses the history of car production and development in Eisenach during the second half of the 20th century. The main subject of research is the engine, to which the vast majority of work is devoted. Using the available simulation tools, the cylinder pressure indication is determined, the crankshaft of the two engine variants is subjected to balance analysis, dynamic analysis in terms of torsional vibrations and bearing load is performed using the MBS method, then the two variants are compared.
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Model engine for F4 class aircraft
Čížek, Petr ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
The diploma thesis deals with the construction of two-stroke engine for the propulsion of a scaled aircraft model, which can fall into the category FAI F4. The introduction of this thesis carries out research and familiarization with the category of F4 aircraft. Part of the research is a brief overview of two-stroke and four-stroke variants of model engines, with the fact that more attention is given to the construction details of two-stroke engines. Subsequently, the design and thermodynamic 1-D simulation of the power parameters of the designed engine are carried out, followed by dynamic simulation to verify the lifespan of the engine bearings.
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Increasing the Volumetric efficiency of a two-stroke engine
Šmahel, Matěj ; Drápal, Lubomír (referee) ; Beran, Martin (advisor)
This bachelor thesis deals with a design modification of a chosen two-stroke engine with respect to an increase in its filling efficiency resulting in increased performance. The first part of the thesis describes basic principles of a two-stroke engine alongside a detailed description of all its cycles and their influence on the filling efficiency. The second part is dedicated to the design modification itself ending with a result evaluation.
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Two-stroke engine
Štrba, Matej ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
The aim of this thesis is description of a design, development of a two-stroke engine, its modernization, possibilities of the modifications and thus the change of the performance parameters and subsequent applications of some modification on the engine of passenger car Trabant.
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A two stroke engine for paragliding
Šafařík, Petr ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This diploma thesis deals with the design of a two-stroke engine for paragliding. First of all, the different types and designs of two-stroke engines are discussed. After the design of the crank mechanism, the forces in the engine are tested, followed by the strength control of selected components. In addition, the work includes design of individual engine components, propeller reducer and 3D models of components and motor unit.
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Single-Cylinder Two-Stroke Engine for Enduro Motorcycle
Koten, Stanislav ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
This thesis deals with the construction of two-stroke motorcycle engine. Specifically, the racing engine for the Enduro class with a displacement of 250 cm3, adapted to be mounted in a chassis with extremely long swingarm according to patent of Frantisek Krnavek. The introduction briefly describes the E2 class rules and discussed design powertrain solutions of this class. Following design and calculation of required motor parameters. Further attention is devoted to detailed calculation of main bearings lifespan. The next section describes in detail the construction of the crank mechanism, cylinder head, exhaust pipe, power valve and reed valve. Conclusion deals with location of other engine parts.
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Increasing Single Cylinder SI Two-Stroke Engine Performance
Stejskal, Miroslav ; Drápal, Lubomír (referee) ; Svída, David (advisor)
This thesis deals with two-stroke engine design modifications to enhance its performance parameters. The introduction summarizes the various solutions of two-stroke engines. The next part deals with design modifications of the engine power, their implementation and subsequent modification. The work includes strain and stress analysis of the piston, which includes a complete indication of pressures in two-stroke engine. The achieved results of FEM analysis were used to design better piston geometry.
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Innovation of built-up crankshaft for minibike engines
Doležal, Lukáš ; Mazůrek, Ivan (referee) ; Hanuš, Stanislav (advisor)
The present diploma thesis deals with innovation of built-up crankshaft of Blata minibikes. Minibike is the type of a small two-stroke motorcycle equipped with an internal combustion engine of the volume 40 or 50 cm3. The machine is designed for racing circuits; not only for young riders but also for seniors. The innovation is in the design and verification of pressed connections in the imposition of major pins in the arms of the crankshaft. Pressed connections are designed on the basis of the analysis of force interaction on the crankshaft at maximum revolutions. The proposed solutions are verified by FEM calculations. Based on the results, the best option is selected. For the selected option, the impact of force interaction at maximum machine performance is studied. Finally, on the basis of these facts, designing, technological and economic analysis of feasibility of new production technology is carried out.
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Two-stroke Engine Pre-ignition Controller with Microcontroller
Veselý, Tomáš ; Vorel, Pavel (referee) ; Šebesta, Jiří (advisor)
This paper deals with the problem of two-stroke engine pre-ignition controller with the use of microcontroller for single-cylinder engine and double-cylinder engine. The mechanical design is drawn for motorcycles JAWA and ČZ and for engines of the same mechanical type. The establishment uses non-contact status analysis of engine with non-electric sensor. The very important thing for the design is the simplicity of the establishment. The other important thing is the minimisation of mechanical arrangement of engine and the vehicle as a whole. The importance of this establishment is non-contact switching and the possibility of changing pre-ignition maps depending on the number of rotations per minute, the temperature and the load of the engine.
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