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Plastic spur gears
Jordán, Jakub ; Dvořáček, Jiří (referee) ; Venclík, Jiří (advisor)
The bachelor work deals with describe to problems plastic gears and give actual state of knowledges in this section. The work deals with material, constuction and calculation plastic gears. Contains most frequent gear failure this gears and developments apply in mechanical engineering.
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Structural design of a new type stacking device
Pisinger, Petr ; Škopán, Miroslav (referee) ; Dvořáček, Jiří (advisor)
This thesis is focused on the structural design of the collector which is an adapter for a front loader tractor. This facility will be designed primarily for handling bales of straw. The input parameters are the lift height of 1.6 meters from the basic position. Adapter Capacity 270 kg and a maximum weight of 300 kg. To fix the adapter to a stacking device for loader is used euro system.
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Development of a New Generation of Devices with Advanced Diagnostics for Determining Contact Degradation
Dvořáček, Jiří ; Hájek, Karel (referee) ; Náhlík, Luboš (referee) ; Pazdera, Luboš (referee) ; Mazal, Pavel (advisor)
The thesis proposes a methodology for damage identification of thrust bearings using acoustic emission method. The work is the way of the hydraulic loading of specimens and thrust bearings with programmable settings severity and duration of load cycles during contact fatigue tests at stations Axmat. They are designed structural adjustment elements (waveguides) to capture the acoustic emission signal selected apparatus, including the modification of software to capture the data. At the described experiments is verified functionality of the circular test specimens and axial bearings . Part of this work is to propose a new methodology for identifying early stages of contact fatigue using a combination of diagnostic methods.
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Processes of contact damage bearing materials
Chaloupka, Petr ; Dvořáček, Jiří (referee) ; Hort, Filip (advisor)
The focus of this bachelor’s thesis is treatise on processes of contact failures of bearings and theirs materials analyse type of degradation processes of material, contact fatigue strength and means of metering. In fine of bachelor’s thesis are given development of future tendencies in optimalization of bearings.
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Desk for splitting semiautomatic
Jurák, Pavel ; Vlašic, František (referee) ; Dvořáček, Jiří (advisor)
The subject of the bachelor thesis is the design of the working table, which will ensure the stem lifting and its transport to the splitting semi-automat. Lifting of stem with weight up to 500 kg is ensured by lifting arms. Then, the stem is moved to the splitting semi-automatic by means of a belt conveyor. The design of the frame is designed to withstand a load of 5000 N. The lowest security has k = 1.2 according to the strength analysis. The table frame can be easily folded using a hydraulic cylinder. Thanks to this we can easily mount the frame behind a splitter semi-automatic and transport both devices at the same time.
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System for Exhausting of Combustion Gases over the Sintering Grate
Kratochvílová, Silvie ; Galas, Radovan (referee) ; Dvořáček, Jiří (advisor)
This bachelor thesis deals with solution for waste gases exhaustion system above the sinter grate. The first part is dedicated to the general treatise about sinter grate, its operations and individual modifications. Another part looks into issues covering placing of the cover above the sinter grate. Proposal of optimal solution of the waste gases exhaustion system is done in last part, where are described reasons, which lead to its choice.
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Design of screw driven lift
Kratochvíl, Michal ; Klapka, Milan (referee) ; Dvořáček, Jiří (advisor)
This bachelor‘s thesis was created in order to create a new engineering design solutions power unit and lifting device of the lifting platform. Due to the rapid wear of the rope and the increasing cosi, it is necessary to modify this design.. In the first part of this thesis is elaborated research dealing with the issue of lifting equipment. After this section, followed by a proposal and the final design solutions. For the solution variant is prepared drawing documentation.
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Construction of vaccine dispenser
Fux, Jan ; Klapka, Milan (referee) ; Dvořáček, Jiří (advisor)
The aim of this thesis is to perform a constructive design of a device for the batching and application of vaccination against rabies in stated size and shape. Vaccines will be dropped from the aircraft and therefore the crucial parameter is the shape and weight of our device. Subsequently, a functionality of this device will be tested. The thesis includes creation of 3D model, drawings of selected components, construction drawing and functional sample photo documentation
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Design of Oil Pump for T158 Transfer Case
Gášek, Martin ; Jakubec, Josef (referee) ; Dvořáček, Jiří (advisor)
This master’s thesis deals with a new design of an oil pump for Tatra T158 transfer case. The new solution should replace earlier involute internal gear pump which is not able to provide sufficent lubrication. The main problem of the old design is a poor suction at low speeds of the vehicle. Gerotor type of the pump has been chosen. Its main advantages are a convenient specific flow rate and good volumetric efficency. In an analytic calculation of the pump gearing also important functional parameters have been checked, like a pressure angle, flow rate, flow irregularity, specific flow rate, specific slipping. A design with and without axial clearance compensation is introduced. Measurements on a test rig confirmed good suction ability even in low revs. Generated flow rate and pressure are improved. That is a good prerequisite for faster assembly of transfer case with no testing of each oil pump. The tests have not revealed any unexpected wear of parts of the pump so far. It is supposed an application of the new gerotor design in a serial production of T158 truck and other types in the future.
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