| 摘要 |
PROBLEM TO BE SOLVED: To reduce the fitting space for a plurality of sensors 45-47, facilitate the fitting work and inspection and repair works for the sensors 45-47, and further, keep the favorable performance of these sensors for a long time. SOLUTION: A sensor unit 44 is externally fitted fixedly on a part of the circumferential face of a seal case 17a is internally fitted fixedly at the end of the outer ring 4. The inner circumferential face of the sensor unit 44 is formed in a partial cylindrical shape having a center angle smaller than 180 degrees. A temperature sensor 45 is installed at the upper end of the sensor unit 44 to easily detect the temperature rise of the outer ring 4 in the state that the sensor unit 44 is supported by the seal case 17a. To the contrary, a rotary speed sensor 46 and a vibration sensor 47 are installed at the part near the lower end of the sensor unit 44 which is less influenced by the temperature rise.
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