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Požadavky současných systémů vstřikování u vznětových motorů na paliva a motorové oleje
Drda, Tomáš
Bachelor thesis Requirements of modern diesel fuel injection systems for fuel and motor oils focuses on the methods of formation of mixture and differences in diesel fuel injection systems. Its aim is also fuels classification and diesel fuel parameters as fuel for diesel engines. In the context of the thesis, it also deals with emissions from diesel fuel combustion and requirements for modern motor oils.
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Stanovení teplotních závislostí motocyklových olejů
Ondrášek, Petr
This thesis deals with the determination of temperature dependence of motorcycle oils. A review of literature contains knowledge of fluid mechanics, partition information, use, appropriate selection and analysis of lubricants including their production and historical development. It is also characterized by a chapter dealing with the recycling of lubricants, including legal claims needed to be placed on the market. There is also a chapter on the lubricating circuit of motorcycles. The practical part of the detailed specification used oil samples, including technical parameters motorcycles from which they were taken. The data needed for evaluation was obtained by measurement with a rotary viscometer DV2T and apparatus for measuring the density Densito 30 PX. The values so obtained were graphically using Microsoft Excel 2010 for application of a suitable mathematical model.
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Degradace motorového oleje ve vznětovém motoru užitkového automobilu
Bílík, Jan
This thesis discusses the degradation of engine oil in a diesel engine of utility vehicle. The first part focuses on the fundamental issues of science discipline, which deals with identification of existing motors current status using information obtained from the analysis of the lubricants and fundamental character of lubricants. The next chapter is to outline the division oil production and their causes and methods of actual degradation. The actual chapter is also devoted to the lubrication system and its function. The experimental part deals with the actual provisions of the degradation of engine oil. There is a described process of taking individual samples and the methods for the determination of the examined physical quantity. Furthermore, the results themselves are processed and shown in the organized charts, where values were interleaved by linear regression and determination coefficients of R2 determination. In the end, conclusion of summary and discussion of the result are made.
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Měření hustoty provozních kapalin
Gross, Petr
The main aim of my bachelor thesis was to obtain and study information about density measurements, working fluid and measurement methods. I primarily focused on changes of density depends on temperature. Density was measured at three different temperatures (5°C, 22°C a 40°C). Have been used working fluids such as screen wash, brake fluid, antifreeze/coolant, motor oil and transmission oil.
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Provozní degradace motorového oleje v zemědělské technice
Řezníček, Ladislav
This thesis focuses on the description and detection of service degradation of engine oil in agricultural technology. The first part is an introduction to lubricants. Followed by an overview of the classification of motor oils according to their composition and viscosity. In other chapters the thesis deals with the the issue of lubrication of internal combustion engines and further clarification of the causes of penetration of wear particles in the engine. The experimental part of the work examines the motor oil used in the tractor Zetor. Oil samples were taken at intervals of 50 hours . In the beginning there are described the methods and appliances used to determine parameters of the samples . Final results are processed and show in charts. Their valuesdetermine the coefficients of determination R2. A total of eight samples of engine oil MADIT M7 ADS III were used. Seven of the samples were taken from the oil tank of the tractor and one sample was brand new. For these samples the chemical composition was examined as well as the amount of wear particles in the oil . Furthermore, the density and dynamic viscosity were meas-sured. Kinematic viscosity was calculated based on these two parameters. The state of degradation of engine oil was finally determined from all of these results.
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Reologický profil motorového oleje používaného ve čtyřdobých pístových motorech
Kumbár, Vojtěch
This dissertation deals with rheological and flow behavior of engine oil used in four-stroke piston engines. Experiments were performed using some selected oils used in motorcycles, cars and agricultural machinery. Samples of used oil were collected and analyzed. The following parameters were measured: time-dependence of dynamic viscosity and shear stress of engine oils, the dependence of shear stress on the shear rate of engine oil, temperature dependence of engine oil density and temperature dependence of dynamic and kinematic viscosity of engine oil. To evaluate the degree of degradation of analyzed engine oils, the measured results were compared with data concerning new, (non-used) motor oil of the same trademark and specification. Thereafter, mathematical models were elaborated using the results obtained in individual measurements. Correlation coefficients and coefficients of determination existing between measured and calculated values were calculated and evaluated. Elaborated mathematical models can be used when predicting the behavior of engine oils and liquids with similar rheological characteristics.
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Teplotní závislosti různě viskózních automobilových motorových olejů
Piták, Jan
This thesis is focused on the determination of the temperature dependence of automotive engineoils with different viscosity class. The first part of the thesis describes the individual functions, properties and composition of engineoils which it is possible to meet the automotive industry. Experimental part deals with temperature dependence density and viscosity of five new engine oils and one used engine oil with the same specification as one of the new oil. The four oils are classified with synthetic base and one with mineral base. The viscosity measurement was carried out using digital rotary viscometer Brookfield DV2T LV and the density measurement was carried out using a digital densitometer Densito 30 PX. As expected, the values of shear stress, dynamic viscosity, kinematic viscosity and density decreased with increasing temperature. Temperature dependence of density and viscosity of oils was modelled using an exponential function, in which were subsequently evalued coefficients of determination R2.
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Stanovení teplotní závislosti automobilových motorových olejů stejné viskozitní třídy
Korbička, Jiří
The thesis deals with motor oil with the same viscosity class 5W-30. Five samples were monitored for new oil and two samples of the used motor oil of the same specification. Their physical and mechanical properties were compared depending on temperature. The first part is focused on the production of motor oils and their classification. In subsequent chapters their functions and features are described. The last part includes the description of methodology, the actual measurement, graphical and statistical processing of data, comparing results and conclusions.
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