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Piston Rings of Modern Diesel Engines
Homola, Petr ; Knotek, Jiří (referee) ; Raffai, Peter (advisor)
This bachelor thesis concentrates on piston rings and is divided into several points. First point deals with the functions of piston rings and with the demands for them, in the second point there is a division according to the type of the ring and constructing solution. Another chapter deals with materials that are used the most when fabricating piston rings and the last chapter deals with the surfacing that is used the most.
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Characteristic Piston Ring Failures and Their Corrective Methods
Orság, Josef ; Knotek, Jiří (referee) ; Raffai, Peter (advisor)
This Bachelor's thesis concerns the most common failures of piston rings. The first part of this thesis focuses on the design of a piston ring and on the load affecting it. The second part describes various kinds of lubrication. This section also shows, which lubrication states occur during operation of internal combustion engines. And final part is devoted to the most common failures of the piston rings and how to prevent them.
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Piston Ring Tribology in Internal Combustion Engines
Orbán, Tomáš ; Maršálek, Ondřej (referee) ; Raffai, Peter (advisor)
The theme of the thesis is tribology of piston rings for internal combustion engines. The work is divided into seven chapters. The first chapter deals with the piston rings, piston rings requirements, describes the main functions of piston rings, types of piston rings, compression rings and oil control rings. Finally, this chapter provides information about the kinematics of piston rings. The second chapter presents the mechanism of friction and lubrication of piston rings, is dedicated to tribology, friction, friction observation history, mechanism of friction and friction suitability. In addition, the work contains information about lubrication, specifically about a lubrication way of internal combustion engines and lubrication regimes. The third chapter deals with hydrodynamic lubrication. The theme of the fourth chapter is boundary lubrication. The fifth chapter provides information about mixed lubrication. Friction in the oil film is the theme of the sixth chapter. Last seventh chapter deals with dry contact friction due to surface roughness contact.
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Reduction of Contact Pairs Friction Losses
Novotný, Marek ; Raffai, Peter (referee) ; Maršálek, Ondřej (advisor)
This bachelor thesis deals with the topic of mechanical efficiency of contact pairs in the crankshaft of the combustion engine. The introductory section focuses on the efficiency of the combustion engine as a whole. In addition, it describes the areas where mechanical losses primarily occur. The following chapters describe mechanism of friction losses, the main factors affecting their amount and the most modern ways to increase mechanical efficiency. In the closing chapter, some basic computing relations, describing the size of mechanical losses are listed. The aim of this thesis is to acquaint the reader with the importance of mechanical efficiency in the area of combustion engines.
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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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Piston for VW TDI 81kW Engine
Skoupý, Petr ; Dundálek, Radim (referee) ; Svída, David (advisor)
The bachelor‘s work deal with proposal piston for VW TDI 81 kW engine. Aim this work is determine principal dimensions of the engine, the crank mechanism and piston. At the beginning are describes a parts of the engine and then there the piston assembly. Further there is a work deal constructional design and material of piston. In a last way too strenght calculation of critical piston cross-sections.
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Piston for 66kW 4-stroke CI-engine
Mikulka, Václav ; Dundálek, Radim (referee) ; Svída, David (advisor)
The content of this baccalaureate work is to make computational proposal and constructional design of the four-stroke diesel engine piston. At the beginning it shortly describes the piston as a part of a piston assembly, basic constructional design of pistons for diesel engines, piston material and the way of production. Further there is a proposal of basic engine dimensions and the crank mechanism. Then there is an elaborated piston dimension on the basis of empirical data. At the end of the work there is a calculation of critical piston cross-sections calculated according to given process of the indicator diagram and designed kinematics of crank mechanism.
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Piston for 77kW 4-stroke CI-engine
Štol, Michal ; Svída, David (referee) ; Dundálek, Radim (advisor)
Annotation Michal Štol Piston of 4-stroke supercharged diesel engine for passenger car ÚADI, 2008, 39 pages., 18 images. In this bachelor works we will focus on description of piston’s group mostly, with characteristic properties and sorts of production. Further, we will make basic design of piston with strenght control of critical piston intersections. Then we can make drawings of individual part of piston.
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Piston for 225 kW 4-stroke SI-engine
Bauza, Erik ; Dundálek, Radim (referee) ; Svída, David (advisor)
Contents of this work is processing of computational suggestion and construction solution of piston for four- stroke SI turbocharged piston with power of 225 kW. This work is point to suggestion of basic dimension of engine, crankshaft mechanism and basic dimensions of piston. Designed piston is controled in critical sections. In this work is also shortly describe last tendency on development and construction of pistons, also a shortly describe of single components of designed engine.
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