Based on analysis of the geometric relation and motion relation of bearing

a mathematical model for radial runout of cylindrical roller bearing in consideration of inner raceway profile was developed to investigate the influence of inner raceway roundness error (ie.

amplitude

order)

the roller number and radial clearance on rotational accuracy. The model was validated to be reasonable by specific spot way. The results indicate that inner raceway roundness error has a significant influence on rotational accuracy of cylindrical roller bearings. The rotational accuracy of cylindrical roller bearings drops sharply with increasing the amplitude of inner raceway roundness error. The effect of loworder harmonic on the rotational accuracy is greater that highorder harmonic. When harmonic order is an integral multiple of the roller number

the rotation accuracy of cylindrical roller bearings significantly reduces. The rotational accuracy of cylindrical roller bearings could be improved by reducing the amplitude of inner raceway roundness error.