| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a bearing device for improving the detection output of a rotary speed with the minimum manufacturing cost. SOLUTION: A device has a pulser ring 10 with two rows of windows 11 and 12 which are fixed to an inner wheel and are formed with a specific gap in axial direction, a first magnetic body 17 which penetrates a magnetic coil 26 and where gear-shaped terminal part 17A opposes the rows of windows 11 in peripheral direction, and a second magnetic body 18 which does not penetrate the magnetic coil 26 and where gear-shaped terminal part 18A opposes the row of windows 12. The first and second magnetic bodies 17 and 18 are connected to the N pole of a magnet 16. In the gear shape of the first magnetic body 17 and that of the second magnetic body 18, phase is shifted by one gear in circumferential direction. By increasing the gap between the rows of windows 11 and 12, the magnetic coil 26 can be increased.</p> |
