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Transmission error in spur gears
Bartošová, Daniela ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This master’s thesis is deal with the area of determining the static transmission error in spur gears. Nowadays, around vibration and noise formation, the issue of transmission error is being discussed quite often. In the first part of this master’s thesis, there is a description of the theoretical requirements concerning the above stated issue. These theoretical requirements are further applied in parametric planning of the spur gears as well as in measuring the transmission error itself. In this master’s thesis, both the detailed description of planning the parametric model of spur gears and the strain-stress analysis may be found. These requirements are needed for calculating the transmission error. In conclusion of this master’s thesis, specific results of the static transmission error in spur gears achieved at diversifying load torque, center distance modifications as well as tip relief modifications of spur gears are being presented. The issue was solved by computation approach with the help of CAD software called Creo Parametric and FEM software called Ansys Workbench and Ansys Mechanical APDL.
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Design of gearbox for electric vehicles
Košík, Matej ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This diploma thesis deals with designing electric vehicle gearbox. Gearbox should serve as virtual replacement for actual transmission of VW ID.3 EV. Designed gearbox has two gears. In the first section there is an extensive search processed of drivetrain and transmission of battery electric vehicles. Next section contains choice of transmission concept and analyses solving of individual structural nodes – gear wheels, band breaks (components that engage individual gears), carriers, shaft, bearing. In the conclusion of diploma thesis, the two-gear planetary transmission is evaluated.
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Strain-stress analysis of gear coupling
Vondra, Róbert ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the contact analysis study of crown gear couplings during the simulation of its working conditions. The toothed coupling transmits high torque, even when the input and output shafts are misaligned due to outside tooth shape. For this reason, it is necessary to design the gear shape correctly. The inherent use of toothed couplings results in a wide range of working speeds and load transfers. This can cause several problems, if the parameters are selected incorrectly. Among the most significant of these is the generation of vibrations during gear engagement, accompanied by noise and the excessive loading of components, such as shafts and bearings. It is not possible to completely reduce uneven running, even with knowledge of the latest trends in the field of gear development. For this reason, it is necessary to eliminate the paths where the vibrations can propagate during the design itself. Inefficient and costly experiments are often used to determine the correct shape of gear teeth. For this purpose, a computational approach to describe a contact pressure on the teeth of couplings at different misalignment and loads is proposed. The model helps to understand the composition of the contact pressure during the working mode of misalignment and its behaviour within the rotation of the gear coupling. The introductory part of thesis presents the current state of knowledge of gear couplings and a description of load distribution issues, regarding the angular misalignment, torque and friction. In the following chapter, three possible approaches to the problem are described - analytical, experimental and computational. The following work offers the introduction and creation of two different computational models, varying in different tooth shape on the hub and the sleeve. Each geometry was subjected to a different load moment, a misalignment of the hub, or the rotation of the gear coupling as a whole. The main monitored parameter was the course of contact pressure in each step, when changing the degree of misalignment or the rotation of the model. Finally, three main sets of contact pressure on the teeth are presented, in connection with the reduced pressure plotted on the toothed rings. There is derivation of results and mutual comparison of each load case. The computation approach in FEM program Ansys Workbench was used to solve the problem.
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Test Rig Design for Durability Testing of the Rubber Segments
Borek, Vojtěch ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The aim of diploma thesis is construction design of test rig for durability testing of the rubber segments. The work contains a brief description of tested component, test rigs and individual parts of the testing system. Next chapter describes conception and construction solutions with justification of choice specific parts, supported by analysis of critical parts. Finally the overall construction design is evaluated and accompanied with a documentation of drawings, which is attached to the thesis.
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Use of 3D printing in the production of functional prototypes for automotive
Mikulášek, Marek ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This thesis deals with the 3D printing of composite materials. The constant development of this technology has enabled the application of this method for the production of prototypes, but also functional components. The theoretical part deals with the study of composite materials and the principle of production using additive technology. In the practical part, an analysis of the suitability of part processing using the 3D printing method is performed on a specific component and than applicated to the assembly hall located in ŠKODA AUTO a.s.
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Concept Design of Turbocharger Regulation to Separate Flue Gas Flow
Rajhel, Martin ; Řehák, Kamil (referee) ; Novotný, Pavel (advisor)
This bachelor’s thesis focuses on the research of existing principles of turbocharger regulation. It is trying to create a concept of turbocharger modification of design to separate the flue gas flow. This concept is applied to a turbocharger which was designed by company Honeywell s.r.o – HTS CZ o.z. The change of shape was realised by using program CATIA v5. In conclusion there is evaluation of the results.
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Design of the Gear Coupling for Railway Vehicle Application
Pelíšek, Vojtěch ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
The aim of this work was to create a design of a gear coupling for railway vehicle application. The work presents a comprehensive view of this issue. First of all, a brief theoretical introduction to the issue is made. The practical part follows, where the design of the whole coupling and especially the newly designed solutions are described in detail. The strength analysis performed deal with the key components that are necessary to ensure safe operation. These analyses can be applied not only for this particular case, but also to gear couplings of different designs, because in principle these calculations do not differ much. In the last chapter, which deals with the dynamic model, all the theoretical assumptions are verified, especially the coupling movements and the applied loads. If the reader deals with the issue of gear couplings, not only in the railway industry, this work presents a comprehensive view of this component. The designed coupling and all performed simulations are really usable in operation.
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Analysis of state of stress in press and shrink fits
Dudek, Milan ; Řehák, Kamil (referee) ; Horníková, Jana (advisor)
This thesis is focused on calculation of overlap in press fit depending on vield strength. There are used methods of analytic elasticity. The counted values are implemented into the technologic process as updated technologic specification. The practical values of overlap depend on exactness of available technology. The evaluation is done at the end of thesis (economic evaluation as well)
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Gear failures
Paška, Josef ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This bachelor thesis is focused on gears. The first part of the thesis informs about the sorting of each type of gears. In the second part, there is a detailed overview of possible gears failures, including their causes, manifestation and their potential solutions for correction. The last part of the thesis handles technical experiment, which aims to performance of vibrodiagnostic of the gear system, tested on the test state. Measured data were subsequently processed by commercially accessible software, where the vibrations of transmission were recorded – firstly at the beginning of measuring when the gears were without damage and afterwards at the end of testing, when the state of damaged teeth was detected.
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