| 摘要 |
PURPOSE:To enable to detect abnormality of a bearing in an early stage, by detecting the abnormality with using jointly a detection by means of acoustic emission and a detection power by means of vibration acceleration. CONSTITUTION:An acoustic emission conversion element 1 and an acceleration detector 2 are installed on an outer ring, and signals detected respectively by these acoustic emission conversion element 1 and acceleration detector 2 are processed with discriminators 7, 8. At the discriminators 7, 8, the signals are counted by counters 9, 10 and stored in memories 11, 12 every unit time, only in case that the signals go beyond a preset threshold value and a duration t is longer than a set period. Therefore, a control unit 13 makes a diagnosis from a counted value of the counters 9, 10 and a stored content of the memories 11, 12, so that an occurrence of abnormality of a bearing can be detected in an early stage.
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