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Modifying the Babetta engine
Poulíček, Matěj ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
This bachelor thesis is about one of the possible modifications of two-stroke single-cylinder Babetta 210 engine for increasing of power. Further about another manufactured Babetta engines with focus on their pros and cons. Attention is paid also to possible design changes for elimination of drawbacks.
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Motorcycle renovation
Štěpán, Radim ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
The main aim of bachelor thesis is to do a list of operations and knowledges for successful renovation of the ČZ 175 monoblock, motorcycle from 1935. The thesis starts with history of Česká zbrojovka until 1953. It continues with a theoretical list of information for the successful renovation of the body and engine, including a computational and design model of the engine cylinder head. The last part is the work done on the motorcycle, the production of missing parts of the motorcycle and the overall rough estimate of the price of motorcycle renovation in terms of material and time.
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Interaction Core - Melt by Casting of Cylinder Heads from Al Alloys in Semi-Permanent Moulds
Hlavsa, Petr ; Roučka, Jaromír (referee) ; Tegel, Michal (referee) ; Rusín, Karel (advisor)
This dissertation thesis deals with interactions on the interface core - melt by casting of cylinder heads from Al alloys in semi-permanent moulds and solves a specific problem with sticky sand after decoring of a diesel cylinder head casting. It describes in detail the process of core production using the Cold-Box method and process of casting using the progressive technology Rotacast. It theoretically analyses the reaction on the interface core-melt and presents a classification of surface defects by Al castings produced by gravity casting into semi-permanent moulds. It also states the results of technological tests of binders, core mixtures and cores (Cogas analysis). By solution of a problem with sticky sand in intake and exhaust ports of diesel cylinder head casting is used methodology for problem solving DMAIC. All experimental tests are solved in laboratory and production conditions of an international company dealing with casting of cylinder heads from Al alloys in semi-permanent moulds.
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Manufacturing of aluminium alloy castings in sand mould
Exner, Zbyněk ; Roučka, Jaromír (referee) ; Záděra, Antonín (advisor)
The thesis theoretically deals with research activities in the field of molding mixtures, description and division of aluminum alloys for castings. Furthermore, the thesis presents the process of production of the cylinder head of the internal combustion engine Jawa 50, from the design of a 3D model and its production by 3D printing to its casting from aluminum alloy EN AC-46000. Molds from bentonite, self-hardening and oil-bentonite molding mixtures were used to cast the test casting. To complement the experiment, the casting was also made using the lost-wax casting method. For the production of wax models, it was necessary to make a mother mold. Subsequently, two different ceramic shells were made. The first one was designed to cast only one casting, the second one, with a different orientation of the models to the inlet, allowing to cast two pieces of castings at once.
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Production technology design for an engine head of the tractor UR2 and UR4
Kurjak, Dávid ; Osička, Karel (referee) ; Zemčík, Oskar (advisor)
The bachelor's thesis deals with the design of a new technology for machining UR–II and UR–IV cylinder heads, which are cast from grey cast iron. This is a transition from single – purpose centres to universal machining centres. At the beginning of the work, there is information about the given component, information about the used material and a brief description of the original technology. This is followed by the design of a new technological procedure, the choice of tools and gauges, fixtures for clamping and the selection of suitable machines for processing. The work also includes a technical – economic evaluation of new and original technology.
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Modification of a motorcycle spark ignition engine
Poulíček, Matěj ; Ramík, Pavel (referee) ; Kaplan, Zdeněk (advisor)
This diploma thesis is about possible modifications of four-stroke motorcycle petrol engines for increasing power. It also deals with the modification of the Aprilia Leonardo 250 engine from a 2-valve variant to a 4-valve variant, the simulation of this engine and the proposed solution in the GT SUITE. Attention is also paid to the strength control of the crank mechanism of the engine.
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Increasing the efficiency of an internal combustion engine for small autonomous vehicles
Celý, Martin ; Beran, Martin (referee) ; Svída, David (advisor)
The work deals with the analysis of various possibilities of increasing the efficiency of a small internal combustion engine potentially usable for use in the field of autonomous devices of smaller dimensions. It contains an outline of the problems of modern smaller autonomous means and an analysis of available drives designed for them, especially an analysis of propulsion by internal combustion engines. In his next part of the work he provides information about the created mathematical model of the demonstration internal combustion engine in the GT-Power program and an analysis of places where and in what ways its efficiency can be increased. The design of two such components together with the evaluation of the achieved results offers the conclusion of this work.
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Manufacture of cylinder head casting for engine renovation Jawa 50
Pastyřík, Petr ; Myška, Martin (referee) ; Bořil, Petr (advisor)
This project elaborats the manufacture of a cylinder head casting for an engine renovation of Jawa 50. Based on the literary pursuit of suitable foundry technologies and using 3D printing in foundry a casting production technology was designed and the cylinder head was made. The part was designed in the CAD software and then printed on a 3D printer. The printed model was formed in ceramic shell form, then melted and the form was annealed. After that the cast was casted. The last operations were fettling and finishing machining.
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