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Valvetrains of four stroke combustion engines
Přeslička, Jaroslav ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
The thesis deals with technical solutions of four stroke piston engines valvetrains, their advantages and disadvantages. First it describes four stroke engine working cycle and outlines the problems of valvetrain timing. Then follows the description of valve design, camshafts, types of cams and valve lift course. Another part of the text occupies with SV, OHV, OHC and unconventional valvetrains. The following part is focused to the ways of camshaft drive. The last part is engaged in variable valvetrains. At the end there is indicated the future of combustion engines valvetrains.
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Formula 1 Engines
Kaňa, Roman ; Ramík, Pavel (referee) ; Dundálek, Radim (advisor)
This bachelor thesis describes construction of some functional parts of the Formula 1 engine. In the first part I focused on crankshafts, connecting rods, pistons, valve gears and compared them with serial produced engines. The work further continues with the introduction of some unconventional solutions used on Formula 1 engines and comparison of the characteristics of known power units.
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Aircraft Engines till the End of WWII
Falta, Libor ; Drápal, Lubomír (referee) ; Dundálek, Radim (advisor)
Bachelor’s thesis deals with aircraft piston engines until end Second World War. Thesis surveys about known, the most use and non-traditional types of engines in timeline. At the beginning it deals about history of aviation and the first use of piston engine as power source energy for controlled flight. There are high requirements on aircraft piston engines. Improving construction and increasing output of engines. In every chapter typical construction and the most powerful engines of the period are described. Thesis includes influence of both World Wars and some prestigious racings, which considerably accelerated global development. Explain the limit for increase output of piston aircraft engines in the last part.
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Uncoventional Valve Control
Janoušek, Michal ; Svída, David (referee) ; Dundálek, Radim (advisor)
This bachelor thesis describes some non-traditional systems of valve control in four-stroke in four-stroke engine. The first part is about basic valve train arrangement and their use. Further work continues the basic description of selected non-traditional systems of control valves, these are the systems used both in ordinary mass-production, and the racing sport. The thesis included a brief historical development of individual systems and their application in practice use.
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Aircraft Piston Engines
Nepraš, Ondřej ; Svída, David (referee) ; Dundálek, Radim (advisor)
This thesis is focused on the overview of aircraft piston engines. Attention is devoted to known, nontraditional or other interesting construction types of aircraft piston engines largely from period of Second World War. This paper looks at the historical development of aircraft engines and propellers, and is followed by a detailed description of the piston engine design. The detailed description will form the main focus of the thesis. This will cover the main requirements and differences of aircraft piston engines types. Particular engines were selected, described and technical data was given.
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Reduction of Valvetrain Mechanical Losses
Kučera, Pavel ; Píštěk, Václav (referee) ; Novotný, Pavel (advisor)
The topic of this thesis is the mechanical losses in the valvetrain. The purpose is to describe the creation of individual losses and their possible reduction. The main factor of creation of losses is friction. The result of this thesis is to highlight the possible methods to reduce friction and other influences acting on the valvetrain. The main benefit is description various types of surface and design modifications of valvetrains, which are already used or are in development.
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Chain Drive for Valvetrains
Vodička, Richard ; Píštěk, Václav (referee) ; Novotný, Pavel (advisor)
The objective of this bachelor‘s thesis is obtaining the general review about the way of driving valvetrains. Introduction is devoting the driving of distributive mechanism of combustion engines . The text of bachelor‘s thesis is splitted on three parts. The first part is explaining the principle of functioning enginetrain. Briefly are described individual assembling of ventil distributor of engines and its distinction depending on the way of its drive. The main attention is devoted to the chain drive of valvetrain, i.e. distinction of types chain drive, which are necessary for its correct functioning. And also, are described the main parts of valvetrain of the engine and the other possibilities of its driving. The second part of bachelor‘s thesis is comparising positives and negatives of chain drives of valvetrains with the othe one’s. In the third part of bachelor‘s thesis are presented the examples of application of the chain drives in the valvetrains in the four wheel drives machines, cars and motorcycles. In the conclusions is specified the contribution of the chain drive of valvetrains and evaluation of bachelor‘s thesis.
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Belt Drive for Valvetrains
Tomanec, Filip ; Rasch, František (referee) ; Novotný, Pavel (advisor)
This bachelor’s thesis deals with belt drive of valve timing mechanisms, estimation of their vanteges or disavantages. In the first section treat of drive for valvetrains generally, summary description of different drives types and comparison their features and right application. In the second section deals specially with toothed belt systems – construction of toothed belts, their types, marking, most frequent failure, tension and guide. In the last section is showed real solution of timming belt drive.
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Gear Timing Mechanism for Valvetrains
Drdla, Adam ; Rasch, František (referee) ; Novotný, Pavel (advisor)
The objective of this thesis is to provide an overview of geared valvetrain. In introduction are described individual types of gears and their application in combustion engines. Then, the thesis is divided into three chapters. The first chapter provides a thorough analysis of geared valvetrain. Also, individual parts of valvetrain together with alternative methods of valve timing are briefly introduced. The chapter then follows to examine the working principle of gears, how forces and moments are transmitted, advantages of introducing helical gears instead of spur gears, different ways of gear manufacturing, gear material selection, heat treatment of gears and common gear failure mechanisms. The second chapter examines pros and cons of using geared valvetrains. The third chapter shows examples of how are geared valvetrains applied in tractors, trucks, ships, trains, cars and motorcycles. In the conclusion, the main advantages of using geared valvetrains are discussed and the whole thesis is summerized.
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