Temat: lightweight valve - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The researches on the tribological properties of elements of the seat insert-valve-valve guide assembly
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/247690.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
valve timing
lightweight valve
seat insert
valve guide
Opis:: The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Źródło:: Journal of KONES; 2010, 17, 4; 423-430
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The simulation researches on the wear for elements of the seat insert-valve-valve guide assembly
Autorzy:: Siczek, K.
Kuchar, M.
Powiązania:: https://bibliotekanauki.pl/articles/247694.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
valve timing
lightweight valve
seat insert
valve guide
Opis:: The researches have been carried out, where the object has been the elements of valve trains in the different combustion engines. Those elements have been valve, valve guide and seat insert. The analysed valves have been driven by special camshaft, with the cams of trapezoid shape. The special research stand has been elaborated and its scheme has been presented in the article. The mentioned research stand has been driven by electric motor. The rotational velocity of the camshaft has been controlled and measured. The aim of the researches has been to obtain values of wear for valve, seat insert, valve guide vs. valve lift, and rpm of camshaft. The dynamic parameters have been analyzed for the seat insert - valve - valve guide assembly, experimentally and by simulation either. During researches the values of valve lift, of valve acceleration, of temperature for seat insert and additionally sound level have been measured. The wear of valve, seat insert and valve guide has been measured, basing on their initial and post-research geometry. The results of experimental researches obtained for different materials for valve, valve guide and seat insert have been presented in the article. The simulation model of the analyzed seat insert - valve - valve guide assembly has been elaborated and presented in the article. Such model has been needed to calculate the values o f the settle velocityfor the analyzed valve. The wear of titanium valve has been a little greater than of the steel valve, the wear of cast iron seat insert mating with steel valve has been much greater than for titanium valve case. The wear of valve guides, made of bronze has been several times less than those of cast iron.
Źródło:: Journal of KONES; 2010, 17, 4; 431-438
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Researches on friction force between valve made of tial and its guide made of phosphorous bronze
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/243568.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: valvetrain
lightweight valve
friction force
TiAl alloy
phosphorous bronze
Opis:: A lightweight valve can be one made of steel but with a drilled stem. Another one can be made of TiAl alloys and its stem can be full or drilled. Lightweight valve can be also ceramic one made of Si3N4. Such valves can mate with guides made of cast iron or of phosphorous bronze in varying conditions in their common contact zone. The aim of researches has been to measure friction force in contact zone between valve stem made of TiAl alloy and its guide made of phosphorous bronze, in the absence of oil. The conditions of room temperature and of the atmosphere pressure have been used during experiment. Mentioned researches have been provided in tester, which design has been presented in the article. The loading of contact zone has varied periodically during serie. The displacement and acceleration of valve and the force during its impact into seat insert have been measured during tests. Additionally the sound level has been measured, either. Tests have been provided for different frequency of driving force. Obtained results of researches has been shown in the article. In all cases the measured sound level have been equal 94 dBA, when sound level of laboratory environment has been equal 40 dBA. Values for coefficient of friction between valve stem and its guide can change from 0.12 to 0.16 and decrease almost linearly with increasing of loading frequency. Values of dry friction coefficient between valve stem made of TiAl alloy and coated by chrome and its guide made of phosphorous bronze can be smaller up to 17% than values obtained in case of valve stem coated by nc-WC/a-C:H mating with a guide made of cast iron.
Źródło:: Journal of KONES; 2013, 20, 1; 295-301
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The researches on the friction properties of nc-WC/a-C : H coating on the lightweight valve stem
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/246658.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: nc-WC/a-C coating
TiAl alloy
lightweight valve
valvetrain
friction coefficient
Opis:: The lightweight valves, especially made of TiAl alloys, are more and more often used in modern combustion engines with cam and camless valvetrain. To increase the wear resistance and to decrease the coefficient of friction between valve steam and valve guide, different kinds of the coating are used. The researched valve has been outlet one made of TiAl6Zr4Sn2Mo2 alloy with the original chrome coating on the valve stem. The nc-WC/a-C:H nanocoating has been deposited on the chromed stem of researched valve, which has mated with the guide made of cast iron. The aim of the present paper is to investigate friction properties of such nc-WC/a-C:H deposited onto the chromed and polished surface of the valve stem. The scheme of research stand has been presented in the paper. On the stand it has been possible to measure values of valve lift and of valve acceleration, the impact force between valve and its seat insert, the friction force between valve stem and its guide, the temperature values for valve guide and for seat insert and a sound level during impacting. Researches have been performed in conditions of room temperature and without oil lubrication in the valve stem - guide contact zone. Basing on the measured values of friction force between valve stem and its guide vs. time and loading frequency, the coefficient of friction has been estimated. Obtained curves of friction force and of friction coefficient vs. time, for different frequency values of valve loading have been presented in the article.
Źródło:: Journal of KONES; 2012, 19, 2; 493-500
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The effect of the design and material parameters on the temperature gradient in lightweight valves in the valvetrains of combustion engines
Wpływ parametrów konstrukcyjnych i materiałowych na rozkład temperatury w lekkich zaworach rozrządu silników spalinowych
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/133947.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: combustion engine
valvetrain
lightweight valve
temperature gradient
silnik spalinowy
rozrząd silnika
lekki zawór
rozkład temperatury
Opis:: According to the current trend to reduce the valvetrain movable masses in combustion engines lightweight valves are used increasingly. They can be made of light alloys from the TiAl alloy group or of ceramic materials such as silicon nitride. They are often coated with additional protective layers to reduce the resistance of friction or the wear intensity. They may also be a hollow structure made of steel with internal reinforcing ribs. Compared to traditional full steel valves they are characterized by different temperature gradients when working in a valvetrain. As a result, their working change, particularly the intensity of the heat transfer and wear. The paper presents valve models developed with the FEM technique for several design and material configurations for lightweight intake and exhaust valves operating under conditions similar to those made of steel. Also the temperature gradients of the discussed valves have been included and compared to those of full steel valves.
Zgodnie z obecną tendencją do zmniejszania mas ruchomych rozrządu w silnikach spalinowych stosowane są lekkie zawory. Mogą być one wykonane z lekkich stopów z grupy TiAl lub z materiałów ceramicznych jak azotek krzemu. Często są powlekane dodatkowymi warstwami ochronnymi dla zmniejszenia oporów tarcia lub intensywności zużycia. Mogą to być też zawory stalowe drążone, z ewentualnym zastosowaniem wewnętrznych żeber wzmacniających. W stosunku do klasycznych pełnych zaworów stalowych odznaczają sie one innym rozkładem temperatury podczas pracy w rozrządach. W efekcie zmieniają się ich warunki pracy, a zwłaszcza intensywność odbioru ciepła i zużywania. W artykule przedstawiono opracowane modele zaworu, wykonane przy użyciu MES, dla kilku konfiguracji konstrukcyjnych i materiałowych lekkich zaworów dolotowych i wylotowych, pracujących w zbliżonych warunkach jak pełne zawory stalowe. Zamieszczono też obliczone rozkłady temperatury i porównano je z przypadkiem pełnych zaworów stalowych.
Źródło:: Combustion Engines; 2013, 52, 2; 94-100
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Properties and research direction for lightweight valves of valve timing in combustion engine
Charakterystyki i kierunki badań zaworów z lekkich stopów dla rozrządu zaworów w silniku spalinowym
Autorzy:: Siczek, K.
Zbierski, K.
Powiązania:: https://bibliotekanauki.pl/articles/245354.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silnik spalinowy
rozrząd zaworów
problemy trybologiczne
combustion engine
camless valvetrain
lightweight valve
tribological problems
zawory z lekkich stopów
Opis:: It has been pul the attention on the necessity for use of valves made of lightweight material in camless valve train in the article. Such necessity has been explained in the aniele [10]. Such lightweight materials are particularly, the TiAl alloys and ceramic composites. The small mass, in respect to the mass of valves made of steel, is characteristic of the valves made of lightweight material. The masses of valves, depending on the case: valve made of TiAl alloy or valve made of ceramic composite, can be smaller about 50% and more than the mass of valve made of steel. The properties of such lightweight materials have been discussed in detail and the methods of their manufacturing have been mentioned in the article. A lot of place has been devoted to titanium alloys, putting attention on the fact, that such alloys are called the materials of XXI century. The classification of titanium alloys has been presented, the problems of intermetallic phases, of alloy microstructure, of heat resistance, high-temperature creep resistance and other have been raised in the article. Finally the direction of researches, being carried out by authors of the article, including tribology of lightweight valves in valve timing has been presented. The aim of such researches is to identify the tribological processes and phenomena, which take place in the region, where lightweight valves mate with valve guides, in assumed bounded lubrication conditions, and in the region, where valve heads mate with valve seats.
Artykuł koncentruje się na potrzebie użycia zaworów wykonanych ze stopów lekkich w bezkrzywkowym układzie rozrządu. Taka potrzeba została wyjaśniona w artykule [10]. Takie lekkie stopy, to szczególnie stopy TiAl i ceramiczne kompozyty. Mała masa, w porównaniu do masy zaworów wykonanych ze stali, jest charakterystyczna dla zaworów wykonanych ze stopów lekkich. Masy zaworów, zależnie od wypadku: zawór wykonany ze stopu TiAl albo zawór wykonany z ceramicznego kompozytu, mogą być mniejsze o około 50% i więcej niż masa zaworu wykonanego ze stali. Właściwości zaworów wykonanych ze stopów lekkich są dyskutowane szczegółowo, jak również metody ich wytwarzania są wzmiankowane w artykule. Dużo miejsca poświęcono stopom tytanu, kładąc szczególną uwagę na fakt, że takie stopy nazywają się materialami XXI stulecia. Przedstawiona klasyfikację stopów tytanu, jak również problemy faz międzymetalicznych, mikrostruktury stopów, żaroodporności, wysokotemperaturowy opór pełzania oraz inne. W końcu kierunki badań wykonanych przez autorów artykułu, włączając w to problemy tribologiczne zaworów są przedstawione. Celem takich badań jest identyfikacja procesów tribologicznych i zjawisk, które mają miejsce w obszarze, gdzie zawory współpracują z prowadnicami zaworów, w ograniczonych warunkach smarowania i w regionie, gdzie główka zaworu współpracuje z gniazdami zaworu.
Źródło:: Journal of KONES; 2009, 16, 4; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The necessity for using of valves made of light materials in camless valve timing of internal combustion engines
Stosowanie zaworów wykonanych ze stopów lekkich w bezkrzywkowym układzie rozrządu silnika spalinowego
Autorzy:: Zbierski, K.
Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/245350.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: silnik spalinowy
bezkrzywkowy system rozrządu
zawory ze stopów lekkich
napęd sterowany magnetoelektrycznie
combustion engine
camless valve timing
lightweight valve
magnetoelectric drive
Opis:: The essence of the camless valve timing for combustion engine has been discussed in the article. It has been put the attention on the different criteria of distinction for such valve timings. The characteristic features of the camless electric and hydraulic valve timing has been discussed. Basing on the valve lift course the possibility of changes for values of geometrical parameters for valve timing has been explained. The performance of electric and hydraulic valve timing has been described with the help of schematic diagrams. It has been put the attention on significant differences between them. The specific, possible to generation, values of the loading valve forces have been presented. Next, the problems connecting with the increasing of the force loading valve and with the decreasing of masses for moving elements of valve timing have been discussed. The masses of valves made of steel, of TiAl alloy and of ceramic composites have been compared. It has been proven, basing on the camless magnetoelectrical valve timing case, that the valve mass influences the combustion engine speed. It was found that the use of lightweight valves instead of steel valves in the camless valve timing of combustion engines can give the decreasing of the valve mass about 50% in respect to the steel valve mass. The use of lightweight valves instead of steel valves in the camless valve timing, with the same geometry, allows to obtain the maximal engine speed which is greater about 11% in respect to the case of combustion engine with classic steel valves. Thanks to lightweight valves it is possible to decrease the pressure values ofoperating fluid in the hydraulic systems of the drives.
Źródło:: Journal of KONES; 2009, 16, 4; 521-530
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Decreasing of movable masses in valve timing using roller tappet
Autorzy:: Warda, B.
Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/247946.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: valve timing
lightweight camshaft
roller tappet
Opis:: The method for reduction of valve timing movable masses, by the use of composite cams for camshaft, which mate with roller tappet, is presented. It has been carried out an analysis of stresses under the surface of the cam using the methodology and computer programs allowing the synthesis and analysis of the cam mechanism, and to estimate the fatigue life, as well as using the finite element method. Mating roller tappets with a light camshaft, forged from TiAl alloy, can be done if the camshaft has steel caps set under the pressure on the surfaces their cams. The problem, however, is the formation of high stress in the Bielaiev point, when a roller tappet mates with segment cam. Because of the certainty for the cap fixing, it is assumed that the depth for the Bielaiev point should not exceed half the thickness of the cap. The stress analysis shows, that exceeding of the material yield strength is controlled by the interference value between the cam and its cap and by the apex radius of the cam. Effect of contact stress is at least an order of magnitude smaller. The maximum depth of the Bielaiev point does not exceed 0.09 mm, which is about half the thickness of the proposed cap. There is a need not for too small radii between the cam and the apical cap. Optimal selection of proper geometry of the cam will be easier after a proper modification of the program used for the synthesis and analysis of the cam mechanism, such that it is possible to ask any operational surface of the cam profile.
Źródło:: Journal of KONES; 2012, 19, 1; 473-481
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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