1779 KB28 KB199920252015Liebrecht, JürgenSauer, BerndSchwarze, HubertSi, Xiaojiangštevilka:6letnik:61str. 399-408, Si 72ISSN:0039-2480COBISSID:14054683URN:URN:NBN:SI:doc-GYDWU65DenZveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikizgube zaradi uporaizgube zaradi vrtinčenjakonični kotalni ležajisimulacije CFDtorni momentvertikalne osiInvestigation of drag and churning losses on tapered roller bearings|Today there are a lot of findings to determine losses caused by contact forces inside roller bearings. But there are also losses in bearings caused by displacement of lubricant. These are known as churning or drag losses. In general the bearing manufacturers give recommendations how to reduce them. The most common solution is the reduction of the oil bath level. Some bearing manufacturers even provide models or empirical equations to calculate the resistance resulting from rolling elements moving through the oil. These models take the operating conditions such as the viscosity of the oil at the operating temperature, oil level, bearing type and rotational speed into consideration. A comparison between calculated and experimental results shows that there is still a deviation because of further effects which are not considered in those analytical models. This paper presents experimental studies and numerical simulations which illustrate the influence of the oil quantity on the total friction torque of tapered roller bearings and identify the resulting lossesKotalni ležaji so pomembni strojni elementi, ki se uporabljajo v najrazličnejših tehničnih sistemih. Njihova prednost v primerjavi z drsnimi ležaji je v manjšem tornem momentu. To je parameter, ki se uporablja za kvantifikacijo izgub pri kotalnih ležajih. Del izgub povzročajo kontaktne sile med kotalnimi elementi in tekalno površino, kletko in obročem. Drugi del so izgube zaradi upora in vrtinčenja, ki jih povzroča izpodrivanje maziva. Ta del je odvisen od delovnih pogojev in lahko močno vpliva na celoten torni moment, zato ga je treba upoštevati pri izračunu izgub kotalnih ležajevTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo