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Experimental and theoretical determination of connecting rod big-end bearing journal motionGroves, Christopher John January 2000 (has links)
No description available.
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TRIBOLOGICAL ANALYSIS OF INJECTION CAMS LUBRICATION IN ORDER TO REDUCE FRICTION & WEARClaret-Tournier, Julien January 2007 (has links)
<p>Engine development is now driven by cost, performance, governmental regulations and customer demands. Several of the requirements have tribological associations. Tribological improvements which consist in lowering friction and improving wear resistance in engines, will play a major role to increase reliability and life cycle.</p><p>The components studied here are parts of the valvetrain mechanism of heavy-duty Diesel engines. The injection cam is one of the most problematic parts of the camshaft, as it is subjected to high pressures from the fuel injector. Lubrication is of significant importance in the prevention of cam failure caused by wear. However, the satisfactory lubrication of the cam and roller contact has proved to be one of the most difficult tribological design challenges to take up.</p><p>For a lubricated contact, the degree of separation between surfaces has a very strong influence on the type and amount of wear. This degree of separation is termed as specific film thickness ; its value provides a measure of the severity of asperities interaction in the lubricated contact. In this report, attention is drawn on the evaluation of oil film thickness in the cam-roller contact, in order to predict regimes of lubrication and thus to identify the probable wear zones of the injection cam. Then, confrontation with experimental results is performed(observation of worn cam surfaces). Future work to achieve is to discover the influence of the different parameters on oil film thickness, by performing a multivariate analysis. The next step will focus on modelling the wear of injection cams, and finally establishing quantified correlations between wear and specific film thickness.</p>
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TRIBOLOGICAL ANALYSIS OF INJECTION CAMS LUBRICATION IN ORDER TO REDUCE FRICTION & WEARClaret-Tournier, Julien January 2007 (has links)
Engine development is now driven by cost, performance, governmental regulations and customer demands. Several of the requirements have tribological associations. Tribological improvements which consist in lowering friction and improving wear resistance in engines, will play a major role to increase reliability and life cycle. The components studied here are parts of the valvetrain mechanism of heavy-duty Diesel engines. The injection cam is one of the most problematic parts of the camshaft, as it is subjected to high pressures from the fuel injector. Lubrication is of significant importance in the prevention of cam failure caused by wear. However, the satisfactory lubrication of the cam and roller contact has proved to be one of the most difficult tribological design challenges to take up. For a lubricated contact, the degree of separation between surfaces has a very strong influence on the type and amount of wear. This degree of separation is termed as specific film thickness ; its value provides a measure of the severity of asperities interaction in the lubricated contact. In this report, attention is drawn on the evaluation of oil film thickness in the cam-roller contact, in order to predict regimes of lubrication and thus to identify the probable wear zones of the injection cam. Then, confrontation with experimental results is performed(observation of worn cam surfaces). Future work to achieve is to discover the influence of the different parameters on oil film thickness, by performing a multivariate analysis. The next step will focus on modelling the wear of injection cams, and finally establishing quantified correlations between wear and specific film thickness.
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Experimental Investigation Of An Oil Loss Mechanism In Internal Combustion EnginesSezer, Ahmet 01 May 2010 (has links) (PDF)
Oil loss mechanisms in internal combustion engines have been subject to many
researches. By the help of technological developments effects of several problems
due to oil losses were examined and tried to be reduced. Environmental pollution and
performance loss are important issues that oil consumption in internal combustion
engines contribute. In this study the effects of individual parameters on the oil
accumulation in 2nd land crevice of internal combustion engines, volume between
top compression rings, were investigated.
The study aimed to investigate the effects of oil film thickness and oil film
temperature on the oil accumulation in the 2nd land which contributes to one of the
mechanisms of oil consumption in internal combustion engines. Controlled
experiments were performed on a modeled piston cylinder assembly.
It was seen that oil accumulated in the 2nd land crevice by blow-by gases was
affected by the film thickness of lubricating oil and the temperature of the lubricating
oil. The amount of oil accumulated increased with increasing oil film thickness. The results also showed that below oil film thickness of 45 & / #956 / m / amount of oil
accumulated increased with the increase of oil temperature.
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Mazání a návrh dynamicky zatížených kluzných ložisek kompresorů / Lubrication and design of dynamically loaded journal bearings for compressorsSikora, Tomáš January 2010 (has links)
Tato diplomová práce pojednává o návrhu ložisek kompresoru. Za tímto účelem byl zakoupen speciální program JDynamic. Tento software poskytuje cenný přínos při navrhování kluzných ložisek a s tím spojených problémů. Programové výsledky reálného kompresoru jsou obsaženy v parametrické studii. Byl proveden test reálného kompresru. Modifikace kluzných ložisek byly zaměřeny na snížení ztrát.
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Testovací zařízení kluzných ložisek / Slide Bearings Test BenchPalán, David January 2015 (has links)
This master’s thesis is focused on measurement of electrical contact resistance. The beginning of the thesis is devoted to the introduction of the electrical contact resistance and electrical parameters of journal bearings. Next part of the thesis deals with engineering design of test rig. In order to verify functional measurement principle, the test rig based on engineering design has been made. In the end of the thesis the measuring devices and the measuring process is described. The measurement results from the test rig are presented.
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