Abstract
The vibrations of all-ceramic ball bearings having silicon nitride rings and balls were investigated and compared with those of hybrid ceramic ball bearings and conventional steel ball bearings. From the experimental results and discussion, the following results were obtained. (1)The overall vibratory velocity level of the all-ceramic ball bearing is influenced by the rotational velocities, and do not change with axial load. (2)The overall vibratory velocity level of the all-ceramic ball bearing is lower than that of the hybrid ceramic ball bearing and the conventional steel ball bearing. (3)The peaks of radial and axial vibration of the all-ceramic ball bearing appear in higher frequencies compared with the corresponding peaks of the hybrid ceramic ball bearing and the conventional steel ball bearing. The peaks are caused by the natural vibrations of the outer ring. (4)The vibration spectra of the all-ceramic ball bearing are mainly determined by the amplitude of the waviness of the raceways and ball suface, the Hertzian spring constant associated with the elastic contact between the raceways and balls, the normal elastic contact deflection between the raceway and ball, the number of balls, the contact angle, and the mobility.
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