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Abstract A device is developed to measure the friction torque of rolling bearings subjected to radial loads while running at steady speeds. The friction torques are measured at various speeds and radial loads for typical rolling bearings used in an engine front end accessory belt drive of a passenger vehicle. The least squares method is used to fit the friction torque and the rotational speed with the optimal function chosen according to the correlation coefficient and significance level. A set of empirical formulae are then derived for the friction torque in terms of both the rotational speed and the radial load. The expressions are more accurate than the Palmgren formula. The test method can be applied to measure the friction torque of rolling bearings used in other fields as a valuable method to characterize the torque characteristics.
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| Keywords
rolling bearing
radial loading
friction torque
data fitting
engine front end accessory belt drive
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Issue Date: 15 June 2014
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2014,
Vol. 54
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