National Repository of Grey Literature 14 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
The issue of pre-contractual liability in relation to the practice of negotiating and concluding commercial contracts under national law and case-law of selected EU countries
Krupka, Jiří ; Horáček, Vít (advisor) ; Eichlerová, Kateřina (referee)
The thesis deals with questions of pre-contractual liability which is seen as a very specific institute whose conception is diverse in different EU countries and also outside. The main research question is a difference between pre-contractual liability perception in the different countries and its full description in relation to the negotiations of business contracts with an emphasis on Czech law. In the first part, the author analyses historical background of pre-contractual liability in relation to Roman law and German-Austrian legal systems in which the professor Jhering developed that construction of culpa in contrahendo. In the following chapters, the author deals with the description and nature of pre-contractual liability, particularly in questions of whether they are contractual or delictual liability and enter into details the basic facts, example and extent of damages with respect to the European concept of pre-contractual liability. He concludes that the pre-contractual liability is in the European concept as delictual liability, with regard to the decision of European Court of Justice. The author simultaneously mentions that although similar facts in the legal systems, the extent of damages is very different when there is a clear dichotomy between positive and negative interesse. The...
Design of a steam engine
Duchoň, Matěj ; Křupka, Jiří (referee) ; Košťál, David (advisor)
This bachelor theses deals with a construction of a model of a single-cylinder static steam engine driven by an external heat source. In this construction, the overall size and weight were limiting. As a part of this theses, the research on existing constructions was carried out. Based on these findings, three conceptual studies were elaborated. As a result, a design solution of a steam engine in a configuration with a flat slide valve and an open crosshead guidance was designed. The model serves as a teaching aid for understanding the principles of the earlier piston machines and for explaining the basic machine mechanisms and thermodynamic process.
Lubrication of plastic gears
Hartl, Petr ; Čermák, Jan (referee) ; Křupka, Jiří (advisor)
The work deals with the process of lubrication of gears from a combination of materials that have significantly different material properties. The experimental measurement is performed on a tribometer in simulated gear contact with a ball-disk configuration. The Chromatic Optical Interferometry method is used to measure the formation of a lubricating film in contact. The purpose of this work is to clarify the process of film thickness formation and compare experimental measurements with predictions, which are valid in Soft EHL regime.
Running-in of machine elements
Rejent, Pavel ; Křupka, Jiří (referee) ; Šperka, Petr (advisor)
This bachelor’s thesis deals with the effect of topography change on the running-in of a machine element. The objective was to evaluate the time change of the friction coefficient during running-in of five steel balls with different surface treatment. The experiment was performed in mixed lubrication regime. There was also a task to measure the change of surface topography after a concrete time intervals. Another task was to evaluate a fluid film thickness for every steel ball. The output of the measurement are graphs containing the time function of friction coefficient and time change of selected surface topography parameters. The change of topography was also displayed on Abbott-Firestone curves and the fluid film evaluation was compared with the predicted value. The thesis improves knowledge about running-in process and provides comparison for surface machining by three different types of sandpaper and shown change in the behaviour of machine element after lapping or polishing.
Construction materials for plastic gears
Vystrčil, Tomáš ; Dočkal, Kryštof (referee) ; Křupka, Jiří (advisor)
This thesis presents an overview of current knowledge of plastic gearing. It is focused on used materials and methods of processing. List of used plastic materials and their properties is presented. Thesis includes a tables of properties of these materials, which allows comparison. Benefits, deficiencies and typical applications of plastic gearing are discussed. Common technologies usable for production of gearing are mentioned. Their advantages, disadvantages and currency is discussed. Thesis gives a summary of this knowledge.
Construction of gears with plastic teeth
Selzer, Tomáš ; Vrbka, Martin (referee) ; Křupka, Jiří (advisor)
The thesis discusses the matter of construction of gear trains using plastic parts in both lubricated and non-lubricated environment, trying to give an overview of an up-to-date information in the process. Nowadays, thanks to several years of development, polymer-based gear systems can be used in many cases as a replacement for metal-based ones. The undeniable advantage of such replacement is mostly the lower production cost and its lower weight, which, together with favorable friction properties of polymer materials, makes a number of technological applications much more effective. The first part is dedicated to listing and defining the typical characteristics of polymer materials, which are essential in the process of designing the gear. The next part focuses on evaluation of the available types of solutions for plastic gear trains construction. The last topic is centered around possible defects and the wear as well as the operation conditions and a real-life application of such plastic gear system. The most notable findings are summed up and commented on in the form a discussion. Thanks to the chosen topic, the bachelor’s thesis adds to a closer understanding of the construction and operation of the plastic gear systems.
Gear design with tolerance analysis
Křivohlavý, Petr ; Křupka, Jiří (referee) ; Svoboda, Petr (advisor)
The thesis is concerned with tolerances of machine elements. The thesis explains dimensional and geometrical tolerance, surface texture and their interdependence. On the basis of the stated facts a simple technique is established to be followed when setting tolerance of machine elements. The procedure is further applied on the transmission that was selected from the three models on hand. The technique is focused mostly on shaft and gear tolerance. The thesis should provide the reader with understanding of how to tolerate selected machine elements.
Pallet truck
Paulíček, Jiří ; Křupka, Jiří (referee) ; Brandejs, Jan (advisor)
The aim of this bachelor thesis is to design a pallet truck, equipped by mechanism which allows the truck to be loaded into van. Truck is designed for manual-hydraulic drive of forks and for load of 1000kg. The basic types of pallet trucks are described in the research part. There is also described Innolift, which is only one with the self-loading mechanism. The main construction nodes are solved in the design part including strength calculations
Modification of the test rig for the testing the bearings for the space applications
Okál, Michal ; Křupka, Jiří (referee) ; Košťál, David (advisor)
This bachelor thesis deals with the design of a device, which allows exploration of rolling bearings properties in space conditions. The adjustment is necessary for testing of a new rolling bearing with different dimensions. Preload of the bearing must be centered and adapted for rapid heat exchange with the surroundings. The effort is made to use maximum number of existing components and torsion stiffness of the device. The thesis outputs are the accompanying report and the technical documentation allowing the production of new components.

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