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Abstract(s)
Os rolamentos sĂŁo um componente mecĂąnico fundamental de inĂșmeros equipamentos, estimando-se que, a nĂvel mundial, haja mais de 50 biliĂ”es de rolamentos a operar simultaneamente a cada momento. Torna-se entĂŁo essencial reduzir ao mĂĄximo as perdas por fricção nestes componentes, o que se traduz em reduçÔes significativas no consumo energĂ©tico, e consequente diminuição das emissĂ”es de gases poluentes. O objetivo desta dissertação Ă© o estudo da influĂȘncia da gaiola no atrito e consequente perda de potĂȘncia em rolamentos lubrificados por massa lubrificante. A avaliação foi feita a partir de ensaios de esfera/ disco e realizados num tribĂłmetro, tendo-se desenvolvido um componente, que Ă© colocado em torno da esfera e simula a gaiola durante os ensaios. Na realização das mediçÔes fez-se variar vĂĄrios parĂąmetros, tais como: a folga da gaiola, o tipo de lubrificante, a velocidade e a temperatura de ensaio. Os resultados foram posteriormente analisados, tendo-se revelado a influĂȘncia da presença da gaiola, tanto em coeficiente de atrito, como em espessura de filme.
A bearing is a fundamental element in countless equipment / machines, and it is estimated that there are 50 billion bearings operating at a given time, worldwide. It is key to reduce friction losses between elements as much as possible, which in turn translates into significantly lower power consumption and pollutant emissions. The main goal of this work is to study the cageâs influence on the friction and resulting power losses on bearings lubricated by grease. The assessment was performed by measuring the traction coefficients and the lubricant film thickness in a ball on disc tribometer, using a specially designed component which simulates the cage. During the tests, several parameters were changed, such as: the cage clearance, the type of lubricant and the testâs speed and temperature. After the analysis of the results, it was possible to conclude that the cage does indeed have influence in both friction and film thickness.
A bearing is a fundamental element in countless equipment / machines, and it is estimated that there are 50 billion bearings operating at a given time, worldwide. It is key to reduce friction losses between elements as much as possible, which in turn translates into significantly lower power consumption and pollutant emissions. The main goal of this work is to study the cageâs influence on the friction and resulting power losses on bearings lubricated by grease. The assessment was performed by measuring the traction coefficients and the lubricant film thickness in a ball on disc tribometer, using a specially designed component which simulates the cage. During the tests, several parameters were changed, such as: the cage clearance, the type of lubricant and the testâs speed and temperature. After the analysis of the results, it was possible to conclude that the cage does indeed have influence in both friction and film thickness.
Description
Keywords
Rolamento Gaiola Massa Lubrificante Atrito Espessura de Filme Bearing Cage Grease Friction Film Thickness