Temat: sealing ring - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of damage of the cooling aggregate in vehicle with cold storage chamber
Autorzy:: Woźniak, M.
Batory, D.
Siczek, K.
Powiązania:: https://bibliotekanauki.pl/articles/247607.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: cooling aggregate
combustion engine
sealing ring damage
failure
blurring
agregat chłodniczy
silnik spalinowy
uszkodzenie pierścienia uszczelniającego
niepowodzenie
Opis:: Vehicles with cold storage chambers realize the transport of fast spoil articles. The cooling system of such chamber is its critical subsystem, the essential component of which is a cooling aggregate driven by vehicle combustion engine via belt transmission. The main assembly of the analysed aggregate was the axial five-piston compressor. Small aluminum pistons were led in cylinders in fixed head made of aluminum alloy. Such pistons were driven through steel tappets, mating through their spherical surfaces with spherical seats made in small pistons. Through their front surfaces, placed opposite to the spherical surfaces, the spatial disc cam made of aluminum alloy drove small pistons. The cam was mounted on the steel shaft. The co-operation of described parts was in presence of refrigerant oil. The abrasive and fatigue wear of elements occurred. Because of long-term utilizing of the aggregate the damage of radial sealing ring occurred. Then, external impurities of high hardness got into the contact zone between the mating surfaces. The main aim of the study was to analyse consequences of such fact. The failure was noticed in the form of wear of disc cam, front surfaces of tappets, and the plastic deformation in the spherical surfaces of the seats. Then, due to deformation and the displacements of the rotating shaft, wear of the side surface of disc cam during contacts with small pistons surfaces took place. Moreover, we noticed wear of the side surfaces of the pistons and the cylinders mating with them in the fixed head. In the article, we present figures of damaged surfaces of elements and results of the SEM analysis of spherical surfaces of tappets. The material transfer occurred between the spherical surfaces of tappets and their seats.
Źródło:: Journal of KONES; 2018, 25, 1; 475-482
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Uszczelnienia wałów korbowych o zmniejszonych oporach tarcia
Crankshaft seals with reduced frictional resistance
Autorzy:: Romanik, G.
Rogula, J.
Powiązania:: https://bibliotekanauki.pl/articles/310267.pdf
Data publikacji:: 2018
Wydawca:: Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:: wał korbowy
pierścień uszczelniający
wargowe pierścienie uszczelniające
szczelność
moment tarcia
crankshaft
sealing ring
radial shaft seals
tightness
moment of friction
Opis:: W artykule omówiona została współpraca elastomerowego pierścienia uszczelniającego z wałem pod kątem zużycia i strat na pokonanie sił tarcia, konstrukcja klasycznego uszczelnienia oraz uszczelnienia o obniżonym oporze ruchu. Ponieważ układ warga uszczelnienia-wał to specyficzna para cierna, skoncentrowano się na lokalnych warunkach styku w skali mikro jako parametrze decydującym o globalnych oporach ruchu w skali makro. Ponieważ wystąpienie przedwczesnej awarii uszczelnienia mimo niedużych kosztów samego elementu generuje poważne koszty naprawy oraz przestój taboru transportowego problem trwałości i niezawodności pracy opisywanego typu uszczelnień pozostaje wciąż aktualny.
The article discusses the cooperation of the elastomeric sealing ring with the shaft in terms of wear and losses to over-come friction forces, the construction of a classic seal and a seal with reduced resistance to movement. Because the lip-shaft system is a specific friction pair, the focus has been on local micro contact conditions as a parameter that determines global motion resistances on a macro scale. Since the occurrence of premature sealing failure in spite of small costs of the element itself generates serious costs of repair and downtime of the transport fleet, the problem of durability and reliability of the described type of seals remains valid.
Źródło:: Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 686-690, CD
1509-5878
2450-7725
Pojawia się w:: Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A Possibility to Improve Resistance of Cast-iron Hydraulic Valves to Cavitation Wear
Autorzy:: Orłowicz, A. W.
Tupaj, M.
Mróz, M.
Kupiec, B.
Jacek, M.
Radoń, M.
Powiązania:: https://bibliotekanauki.pl/articles/382203.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cast iron
hydraulic valve
cavitation wear
plasma sprayed coating
sealing ring
żeliwo
zawór hydrauliczny
zużycie kawitacyjne
powłoka natryskiwana plazmowo
pierścień uszczelniający
Opis:: A common problem encountered in hydraulic valves is a progressing deterioration of tightness of their water flow cutting-off seats. The seats are provided usually with a copper-alloy insert joined mechanically with cast-iron valve housing. The problem of unreliability of such joints can be solved by providing surface of the seat with a coating, deposited with the use of HVOF method and resistant to abrasive and cavitation wear. The tests were carried out for a sealing-draining seat insert made of CuZn39Pb2Al brass used to date and a specimen taken from the cast-iron valve housing which was the substrate for a plasma-sprayed coating of powder containing 86.1% Cr, 7.2% Ni, and 6.7% C. The coating, 345 ± 15 μm thick, was characterized with good quality of bonding with cast-iron substrate and high compactness of the material. The cavitation wear test on materials used in the study were carried out with the use of Vibra-Cell ultrasonic liquid processor (Sonics) equipped with a piezoelectric probe operating at the frequency of 20 kHz. Based on profilograms taken along a line crossing centers of cavitation craters, measurements of the height parameter R_t, and microscopic observations of surfaces it has been found that the coating plasma-sprayed onto substrate of nodular cast iron demonstrated higher resistance to cavitation compared to copper-alloy inserts used so far in cast-iron hydraulic valves. Cavitation craters on the material used typically for valve seats to date were more distinctly outlined and deeper compared to craters observed on the coating. Larger were also sizes of local tear-outs which resulted in larger difference between the peaks line and the valleys line.
Źródło:: Archives of Foundry Engineering; 2018, 18, 4; 31-34
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Evaluation of the ratios of the main indicators of the dry sealing of the cylinder-piston group of internal combustion engines using a solid lubricant
Autorzy:: Nuralin, Beket
Kuanyshev, Murat
Murzagaliev, Akhmet
Kaukarov, Altynbek
Utebayev, Isatai
Powiązania:: https://bibliotekanauki.pl/articles/2203866.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:: wear
internal combustion engine
resource forecasting
cylinder-piston group
dry ring sealing
graphite paste with liquid glass
zużycie
silnik spalinowy
prognozowanie zasobów
grupa cylinder-tłok
suche uszczelnienie pierścienia
pasta grafitowa z płynnym szkłem
Opis:: This article presents the results of a study of an alternative method for reducing friction losses in the cylinder-piston group of internal combustion engines based on an experimental installation, taking into account changes in the real state of the working surfaces of the mating parts of the piston ring-cylinder pair depending on the operating time. The factors with a progressive effect on the operation of engine friction units as they wear out are studied, and the degree of their influence on wear is estimated. A model of the friction unit of a cylinder-piston group (piston-piston ring pair) of an internal combustion engine based on a solid antifriction material operating without the use of a lubricating fluid is developed and investigated. Comparative results of determining the wear indicators of sealing rings by various methods of wear control are presented. A method for predicting the resource and the real state of the engine is proposed.
Źródło:: Transport Problems; 2022, 17, 3; 99--110
1896-0596
2300-861X
Pojawia się w:: Transport Problems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Modelowanie nacisku na powierzchni styku wargowego pierścienia uszczelniającego z wałem
Modelling the pressure on contact surface of sealing ring and shaft
Autorzy:: Grabka, L.
Markowicz, J.
Szweda, S.
Powiązania:: https://bibliotekanauki.pl/articles/199525.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniki Górniczej KOMAG
Tematy:: węzeł uszczelniający
metoda elementów skończonych
sealing ring
finite elements method
Opis:: W opracowaniu przedstawiono metodykę wyznaczania nacisku na powierzchni styku wargowego pierścienia uszczelniającego z wałem za pomocą metody elementów skończonych. Omówiono budowę modelu MES węzła uszczelniającego. Przedstawiono przykładowe wyniki analizy z uwzględnieniem stanu naprężenia spowodowanego montażem pierścienia uszczelniającego na wale, ciśnienia oleju oraz statusu elementów kontaktowych.
Methodology for determination of pressure on the contact surface of sealing ring with shaft using the Finite Elements Method (FEM) is presented. FEM model of the sealing node is discussed. Some results of analysis, including stress caused by installation of sealing ring on the shaft, oil pressure and status of contact elements, are given.
Źródło:: Maszyny Górnicze; 2013, 31, 4; 20-26
0209-3693
2450-9442
Pojawia się w:: Maszyny Górnicze
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The impact of the energy state of the surface of friction pairs on the friction and wear in internal combustion engines
Autorzy:: Borkowska, J.
Kaźmierczak, A.
Krakowian, K.
Cienciała, M.
Skorupa, P.
Łoza, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/245015.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: friction pairs
top layer of surface
sealing function
piston ring
cylinder sleeve
combustion engine
tangential force
friction coefficient
molecular structure
bond
tribology
Opis:: The elements creating a friction pairs are described to be very difficult in terms of defining all optimal parameters in an unequivocal way. The research on stability of friction pairs is focused on the surface and the top layer of surface in the parts concerned. The main goal is to find new design solutions and materials, thereby achieving one million kilometers of mileage to main repair in the case of internal combustion engines. The biggest structural difficulties are noticeable in friction pairs where it can be observed sliding and returning motion, which is also connected with sealing function. A typical example of such pair is piston ring – cylinder sleeve in piston – rings - cylinder unit in an internal combustion engine. Engineers are currently seeking an additional factor, which would enable gaining the reduction of tangential force by reducing the friction coefficient in elements of friction pair during operations. The surface free energy may be such factor - it results from molecular structure and nature of the bonds between the molecules present in the material. Components of surface free energy determine the tribological properties of the material, which is reflected in the stability of the units. Energy state of the surface, which is connected with chemistry and characteristics in the material, is the first step to consider about the impact on wearing in internal combustion engine. This is the main topic of this article.
Źródło:: Journal of KONES; 2015, 22, 4; 37-41
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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