Some characteristics of rolling-element bearings under oscillating conditions. Part 2: Experimental results for interference-fitted taper-roller bearings

Abstract

Some stiffness and damping characteristics are presented for taper-roller bearings with interference fits. The major parameters investigated were preload, temperature, lubricant viscosity, excitation frequency, excitation amplitude, and rotational speed. The prediction, based on a model of the bearings, that stiffness and damping would effectively be independent of oil viscosity was confirmed.

Structural Modifications

“…The speed of rotation and the preload on the bearing(s) may also affect the characteristics. Some early work, published in a restricted circulation [11], was made more widely known [12][13][14]. This showed that the damping in rolling element bearings was not negligible and that there was also damping in the necessary interface between the outer race of the bearing and its housing.…”

“…It is appropriate to describe the method used for the measurements as they were achieved in a reasonably direct manner. The initial work was that of Walford [15], Walford and Stone [16][17][18] and extended by Lambert et al [12][13][14].…”

Some characteristics of rolling-element bearings under oscillating conditions. Part 3: Experimental results for clearance-fitted taper-roller bearings and their relevance to the design of spindles with high dynamic stiffness

“…The effect of joints was investigated by constructing another rig identical to that described in parts 1 and 2 [2,3] of this paper, but with a nominal clearance fit of 5/10 mm between the outer races and the housing. The inner race was again interference fitted so that the joint stiffness would be largely governed by the outer joint and it was possible, if necessary, to measure any deflection occurring across this joint.…”

“…It was again not possible to establish an absolute reference for the preload but the two preloads tested were of nominally 10 and 40 mm axial preset displacement. These preloads correspond to the light and heavy preloads of the initial rig [3]. The instrumentation, calibration, and experimental methods were as described in references [2,3].…”

“…A description of the rig, the principles of its operaation, and a theoretical analysis of the stiffness and damping of rolling-element contacts were presented in part 1 of this paper [2]. In part 2 [3], the results for interference fitted taper roller bearings were presented. In this paper (part 3), the results for clearance fitted taper roller bearings are presented.…”