| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and simple abnormality detection device of a bearing, generating a vibration or a noise to some extent from the device itself, and adoptable even to numerous shaft bearing. SOLUTION: This abnormality detection device of the bearing is provided on a shaft bearing device comprising a rotating shaft and a bearing for supporting the shaft rotatably. The abnormality detection device has a plurality of projections fixed on the shaft and having different projection quantities, a displacement sensor for detecting at least one of the a plurality of projections at each rotation following the rotation of the shaft, a tachometer for operating a rotation frequency of the shaft based on the output. The abnormality detection device is characterized by determining that an abnormality is generated in the bearing when the rotation frequency operated by the tachometer based on the number of projections detected by the displacement sensor at each rotation of the shaft deviates a prescribed range determined beforehand. COPYRIGHT: (C)2004,JPO
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