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Modern methods in spur gearing production.
Kopečný, Libor ; Zemčík, Oskar (referee) ; Zemčík, Oskar (advisor)
The division and comparison of modern methods of production of spur gearings. The introduction is focused on the characteristics and description of cog wheels. Furthermore, the types of gearing and gear mechanisms are introduced. The main part of the text deals with individual ways of a production of spur gearings including finishing methods. The following part of this work describes the importance and possibilities of heat and chemical-heat gearing production. In the last chapters, the evaluation and achieved results of individual technologies of gearing production are introduced.
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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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Description of CNC gearing machines
Matuška, Martin ; Holub, Michal (referee) ; Blecha, Petr (advisor)
This work dissert on gearing production and about machines for it. Here is analyse technique and technology production particular sort of gearing and post-allocation producers of machines for given mothod. For each given machine is mentioned basic description and the most important technical parameters. This work describe topical world production gearing machines.
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Response curves of parametric excited system
Půst, Ladislav ; Škuderová, Alena
Differential equations of motion of 2DOF system with a periodically variable stiffness controled by the absolute motion of system were derived. Matlab/Simulink was applied for numerical solution. Gained response curves were used to show the influence of structural changes (inertia moments ratio) and of gradient of driving motor characteristic.
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Simulation of impact´s effects in nonlinear parametric systems
Škuderová, Alena
The creation of gear pair model with elastic bearings was the aim this work. The model considers the influence of motion in bearings nor only at direction of line of mesh, but and at normal direction, the damping and periodically variable stiffness in the gear mesh, frictional forces, possibly eccentricity of gears or manufacturing inaccuracy of teeth profile and influence of impacts caused by existence of backlash.
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