Temat: valvetrain - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The magnetically loaded noncontact couple between valve tip and surface of cam follower or rocker arm
Autorzy:: Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/242240.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engine
valvetrain elements
permanent magnets
Opis:: The lightweight valves are more and more commonly used in cam and camless valvetiming in combustion engine. They can be made as drilled steel valves or as full but of TiAl alloys or of ceramic material. They usually can mate with the same valve guides and seat inserts made of cast iron, as in case of the standard full steel valves. Sometimes in the high speed engine, the valve insert should be made of chromium steel and valve guides of phosphorous bronze. The one of sources for wear and for resistance of motion for valve is a friction contact area between the valve tip and the surface of rocker arm or of cam follower. To minimize the wear the valve tip should be hardened or have a special hard cup, which makes greater mass of the valve. To avoid the wear and friction resistance in such contact area the mentioned friction contact can be eliminated. Such friction contact type can be replaced by a noncontact couple loaded by magnetic field force. Such solution requires introducing the set of the cylindrical permanent magnet fixed to nonmagnetic valve tip and of the similar magnet fixed to the bottom face of a cam follower or of the set of small plane magnets on the cam surface. The cam should be made of nonmagnetic material either. The model of such assembly of magnets has been made with the help of the finite element method. The values of magnetic force loading noncontact couple have been obtained for some configurations of magnets and for different positions for elements of valvetrain and presented in the article.
Źródło:: Journal of KONES; 2011, 18, 2; 397-403
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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: 3.

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: 4.

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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