The Rotational Accuracy Characteristics of the Preloaded Hollow Roller Bearing

Abstract

The rotational characteristics of the cageless, hollow roller radial bearing are investigated. The preloading of the hollow rolling elements in the annular space between the inner and the outer races in such a bearing provides a well controlled and consistent shaft rotational pattern. This pattern is determined by the dimensional and geometrical features of the rollers’ external and internal diameters and roundnesses, the outer and inner ring raceway roundnesses and the eccentricity of the inner race with respect to the shaft axis. The various patterns of shaft runout associated with these causes are identified and the sensitivity of the shaft runout to these factors is examined qualitatively and quantitively. The shaft runout in the present context is not merely the initial static offset of the shaft axis, but is a dynamic, cyclic pattern consisting of certain frequencies resulting from the geometrical features of the bearing components. The somewhat elusive, complex and dynamic nature of this apparent shaft runout makes it difficult to be measured. In addition, the importance of the need to control the circumferential clearance to a minimum is demonstrated. It is thus shown that through the proper control of the component geometry and certain design parameters, the hollow roller bearing can provide an extremely accurate bearing for precision applications.

A method to predict the radial runout of outer ring in cylindrical roller bearings

“…When the jth roller is located in the second quadrant and point B is located above the line o rj o e , the geometrical relationship between the jth roller and the outer raceway is indicated in Figure 7(c), and u B is calculated by equation (24)…”

“…Wang et al 23 presented a two-dimensional model to predict geometric accuracy of a cylindrical roller bearing considering roundness error of the inner or outer raceway. Bhateja et al 24 established a two-dimensional prediction model for rotational accuracy of hollow roller bearings considering dimension difference of rollers. In previous research, [25][26][27][28] the effects of roundness error of the inner and outer raceways on rotational accuracy of a cylindrical roller bearing were investigated, respectively.…”

Influence of roundness errors of bearing components on rotational accuracy of cylindrical roller bearings

“…Previous research on the rotational accuracy of rolling bearings mainly focused on the radial run-out. Bhateja et al 4 proposed a method for calculating the run-out of hollow roller bearings and studied the resultant components of the run-out from the geometric and dimensional errors in the rollers and raceways. Chen et al 5 , 6 proposed a method for calculating the radial run-out and static load distribution of cylindrical roller bearings and analyzed the effects of the roundness errors in the raceways and diameter differences of the rollers on the radial run-out and load distribution.…”

Influence of Inner Ring Roundness Deviation on the Dynamic Characteristics of Cylindrical Roller Bearing

“…Based on the established nonlinear differential equation, Harsha [1] obtained the influence law of waviness located in raceway surface of ball bearing on the radial runout of bearings. Bhateja et al [2] considered the roller shape error, and the rotation accuracy model without cage of rolling bearing was established to obtain the influence law of roller and raceway deviation on bearing rotation accuracy. Chunsan [3] obtained the influence law of the geometric and dimensional error of the outer ring and the roller on axis center trajectory of the ball bearing through experimental methods.…”