To provide accurate sensor output by preventing a core metal of an encoder from coming off or idling in a bearing unit with a rotation sensor constructed by a combination of a sensor unit and a bearing attached to a shaft when the same is used in an apparatus on which large impact force is applied.
In the bearing unit with the rotation sensor constructed by the combination of the sensor unit 3 and the inner ring rotation type bearing 2 attached to the shaft 1, the core metal 14 of the encoder 13 of a sensor unit 3 is fixed on an outer diameter surface of the shaft 1 by press in fitting, a sensor 21 of the sensor unit 3 is attached to an outer ring 8 of the bearing 2 with facing the encoder 13, and a pin 15 projectingly provided on an inner diameter surface of the core metal 14 is fitted in a groove 6 of the shaft 1 and is used for a detent means.
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TAKADA SEIICHI
Higashio Masahiro
Torii Kazuhisa