Abstract
The dynamic performance and life of the precise bearing, even abnormal operation and early failure are affected directly by the complex and unstable motion of the cage. Based on the cage dynamic performance test device with controllable motion of inner and outer rings, respectively, the dynamic characteristics of the cage were studied under different rotating speeds and loads, while inner ring rotated with outer ring fixed and inner–outer rings rotated reversely. Then the trajectory of the cage mass center was drawn through experimental study. The three-dimensional space motions of cage reveal that, when only inner ring rotates, the trajectories of cage mass center are approximately circular under axial load, and the amplitude of the axial displacement raises with the increase of the rotation speeds. With the increase of radial loads, the cage mass center trajectories are shaking from a circle to a small area on the side of the bearing center. When the inner–outer rings rotate in the opposite direction, the rotation speed of the cage is greatly reduced, and the mass center trajectories of the cage oscillate irregularly on side of the bearing center. As the relative rotation speed of rings increases, the axial displacement fluctuation enlarges. With the increase of the radial loads, the axial fluctuation decreases.
Highlights
With the development of aerospace and equipment manufacturing, angular contact ball bearings are the essential components of aero engines and precision machine tools, their accuracy, longevity, and reliability are critical to the entire equipment
In view of the deficiencies of the current cage dynamic characteristics testing machine, a new type of high-speed angular contact ball bearing cage dynamic performance test rig is developed by our research group, the rotational speed of the inner and outer rings of the bearing are controlled by two motors, at the same time, the rotational speed of the cage is reduced by the inner–outer rings rotated reversely, and the axial and radial displacements of the cage are simultaneously measured by the vertically arranged laser line displacement sensors, a centroid trajectory of the cage is drawn, thereby the research on cage dynamic characteristics can be realized by using the experiment apparatus
Through adequate and extensive experimental works on the bearing cage test rig, the dynamic characteristics of cage in three dimensions with rotated inner ring– fixed outer ring (IRR) and inner–outer rings rotated reversely (IOR) under different speeds and external radial loads are investigated, and the conclusions are drawn as follows: (1) The scheme of cage dynamic characteristics in bearing cage test rig is feasible, without modification in the test bearing, the cage motion in three-dimensional space can be measured by two laser sensors in vertically arrangement
Summary
With the development of aerospace and equipment manufacturing, angular contact ball bearings are the essential components of aero engines and precision machine tools, their accuracy, longevity, and reliability are critical to the entire equipment. In view of the deficiencies of the current cage dynamic characteristics testing machine, a new type of high-speed angular contact ball bearing cage dynamic performance test rig is developed by our research group, the rotational speed of the inner and outer rings of the bearing are controlled by two motors, at the same time, the rotational speed of the cage is reduced by the inner–outer rings rotated reversely, and the axial and radial displacements of the cage are simultaneously measured by the vertically arranged laser line displacement sensors, a centroid trajectory of the cage is drawn, thereby the research on cage dynamic characteristics can be realized by using the experiment apparatus
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