Title

LUBRICANTS FOR ROLLING BEARINGS IN REAR AXLE GEARS OF TRUCKS AND DRIVE GEARS OF LOCOMOTIVES

ESTUDO DE LUBRIFICANTES PARA ROLAMENTOS DO EIXO TRASEIRO DE CAMINHOES E LOCOMOTIVAS

Authorship

Aurichio, Thiago; Cumino, Ricardo S.; Karbacher, Richard

Aurichio, Thiago

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Cumino, Ricardo S.

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Karbacher, Richard

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DOI

10.5151/5463-5463-17179

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Abstract

Lubricants for high loaded gears are selected mostly only for the issues of the teeth. The main manufacturers of such gears made specifications for lubricants. The most specification only content a couple of chemical data and some physical data done with model testers like four ball tester, Timken ok, pin on disc or others. In nearly no case there are data related to Rolling Bearings. In spite of data of model testing cannot be transferred to a real rolling bearing. Therefore it is needed to have tests done with rolling bearings to know about performance of lubricants in rolling bearings. Schaeffler Group engineers developed Years ago the FE8 test rig, that can be used to test oils and greases in different bearings types. a wide range of loads and speeds can realize nearly all conditions a bearing can have in the field. In this way also gear oils for rear axle gears can be tested to look to the suitability of these oils in rolling bearings. Schaeffler research tested a couple of different gear oils for use in rolling bearings in high loaded gears at elevated temperatures. Wear protection, fatigue performance, high temperature performance, deposit formation and filterability have been tested. After this Schaeffler selected best oils for use in best bearings. The results will be reported.

Lubrificantes para engrenagens que operam sob altas cargas são normalmente selecionados com base nos dentes destas engrenagens. Os principais fabricantes destas engrenagens possuem especificações para os lubrificantes, mas a maioria destas especificaões possui somente testes simples como 4-Ball, pino-disco, etc. Em quase nenhum caso há dados relacionados ao rolamentos. Visto que é necessáriosaber a performance destes lubrificantes nos rolamentos, foi desenvolvida a bancada de teste FE8, que pode ser usada ara simular praticamente todosas condiçõesde operação que um rolamento pode ter. Baseado neste método, alguns óleos de engrenagem foram testados para o uso em engrenagens a alta carga e temperatura. Proteção contra desgaste, fadiga e agressividade química foram testados. Com base nestas informações , os melhores óleos foram descritos.

Keywords

Gear lubrication; Rear axle gears; Rolling bearings.

Lubrifição de engrenagens; Eixo traseiro; Rolamentos.