Wyniki wyszukiwania - BazTech

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Ocena wpływu zmian technologicznych na wybrane parametry pracy silników o zapłonie samoczynnym

Suchecki A., Nowakowski J., Knefel T., Sochacki J.

Combustion Engines

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2015

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R. 54, nr 3

839--848

PL

W artykule przedstawiono wyniki badań silników o zapłonie samoczynnym, o niewielkiej pojemności skokowej. Silniki, które poddano badaniom charakteryzowały się tą samą pojemnością skokową, lecz zostały wyprodukowane w dwóch wersjach: o mocy 51 i 67 kW, a dla każdej z wersji zastosowano dwie metody obróbki powierzchni cylindrów: konwencjonalne honowanie oraz wykonanie za pomocą lasera mikrokomór olejowych. Każdy z silników został poddany próbie trwałościowej obejmującej 504 godziny pracy. Do analiz wybrano trzy wielkości: zadymienie spalin, przedmuchy spalin do skrzyni korbowej oraz zużycie oleju smarującego. Tę ostatnio analizowano zarówno w oparciu o średnie godzinowe zużycie wynikające z uzupełniania oleju, jak i zużycie godzinowe zmierzone przy różnych obciążeniach.

EN

The article presents the research results of compression-ignition engines, with a small displacement. Engines that were tested, were characterized by the same displacement, but have been produced in two versions: with a power of 51 i 67 kW, and for each version were used two methods for surface treatment of cylinders: conventional honing and made by laser oil microchambers. Each motor has been tested durability consisting of 504 hours of work. For the analyzes were selected three parameters: opacity, blow-by exhaust gases to the crankcase and lubricating oil consumption. Oil consumption was analyzed based on both the average hourly consumption resulting from the refilling of oil, and the hourly consumption measured at different loadings.

2

Lube oil consumption's impact on environment

Krzymień P.

Journal of KONES

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2010

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Vol. 17, No. 2

265-270

EN

The problem of lube oil consumption has been the point of interest of scientists for years,first because of economy and later - because of stringent standards of environment protection. From the point of economy lube oil consumption is not a problem of modern engines. On the other hand even a brief look proves that there is a quite wide range of admissible consumption from negligible values up to even l litr per 100 km. The question is why this range is so wide. Possible answer is that engine manufacturers leave so wide margin taking into consideration situations of very short trips, mainly in towns, when engine runs not fully warmed up with greater clearances, especially within the piston-cylinder assembly. Any oil consumption results in emission of particulate matter, which conveys a weighty number of hydrocarbons of which the most manifest serious hazardous properties, mainly carcinogenic ones. Nowadays, standards of environment protection require for instance the use of diesel particle filters and the excessive oil consumption could lead to the premature damage of these devices. Correct operation of the DPF could be disturbed not only by the excessive oil consumption but also by the use of improper oil, i.e. the non-low ash one. Certain additives that improve oil properties could produce ash as a result of oil combustion, which could clog filter irreversibly.

3

Lubricating oil consumption at low temperatures

Iskra A., Krzymień A., Krzymień P.

Journal of KONES

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2009

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Vol. 16, No. 4

163-170

EN

The problem of lubricating oil consumption still seems to be important one at least because of the use of DPFs in exhaust systems of diesels. Even a minor consumption can be a source of particulate matter that blocksfilters. On the other hand formation of oil film parameters that guarantee minimum oil consumption could lead to the increased friction losses. Ali these remarks relate to the nominal temperature ofoperation. Situation can differ at temperature of cold start. Presented paper deals the problem of oil consumption at lower temperatures. The observation concerning friction losses under these conditions are mentioned as well. Parameters influencing the lubricating oil consumption, oil consumption at nominal temperature of engine run, oil consumption at low temperature are presented in the paper. As well course of oil film thickness, layer thickness and friction force for upper compression ring at engine nominal temperature of operation, course of oil film thickness, layer thickness and friction force for upper compression ring at lower engine run temperature, ring face wetting level at nominal temperature of operation, ring face wetting level at lower temperature of operation, lubricating oil consumption and friction losses generated by ring pack of single cylinder are subject of the paper.