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CREEM 2022 - XXVIII Congresso Nacional de Estudantes de Engenharia Mecânica
ON THE STRIBECK’s NUMBERS IN RADIALLY LOADED ROLLING ELEMENT BEARINGS
Mário Ricci , SP
Co-Authors: Mário Ricci
Presenter: Mário Ricci
Stribeck investigated the load’s distribution on the rolling elements of a radially loaded ball bearing and found that the maximum ball load could be found multiplying the medium load by 4.37, for zero internal clearance. This number came to be known as Stribeck’s Constant or Number and it’s still used today for bearing sizing. Later, Palmgren stated that the theoretical value of Stribeck's Constant for roller bearings with zero internal clearance is 4.08. This work shows how the Stribeck’s Constants were found, which are approximations of the limits of the ratios between the load on the most heavily loaded element and the medium load, when the number of rolling elements in the bearing tends to infinity. It’s also shown that the error when adopting the value 4.08 for the Stribeck’s Constant, which represents the number that must be multiplied by the medium external radial load to obtain the maximum radial roller load, is 55.6 times greater than when adopting the value 4.37 for the Stribeck’s Constant, which represents the number that must be multiplied by the medium external radial load to obtain the maximum radial ball load.
rolling element bearing, Stribeck's Number, radial load