Study about Vibration Frequency for Ball Bearing Damaged by Electrical Pitting

Sound level and vibration of a rolling bearing increase and a ridge mark appears in the bearing surface when the electrical pitting occurs in the bearing. The frequency in which the sound and vibration increase is attributable to the wave undulation of the formed ridge mark on the surface. However, it was clarified that there was electrical pitting phenomenon without ridge mark. Therefore, in this research, the vibration acceleration was measured in occurrence and non-occurrence conditions of ridge mark. Then, the frequency of increased acceleration was clarified experimentally. The conclusions are as follows. (1) In non-occurrence condition of ridge mark, integral multiple components on rotation speed increased. (2) In occurrence condition of ridge mark, the acceleration increased in frequency caused by the wave undulation of ridge mark. (3) The wave undulation of ridge mark varied and the frequency in which the acceleration increased varied even if the experiments were done in the same condition.