| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure the reliability of the detected rotation of a rotation detecting sensor 15b by securing the magnitude of the output signal of the sensor 15b, even if the shape accuracy and dimensional accuracy of each section of the sensor 15b are not especially enhanced. <P>SOLUTION: The outer peripheral surface of an encoder 13 and the detection plane of the rotation detecting sensor 15b are made parallel to the center axes of an outer ring 1 and of a hub 3a in the direction of the center axes. In addition, an active rotation detecting sensor is used as the sensor 15b. Accordingly, even if the relative position of the encoder 13 and sensor 15b deviates in the axial direction, the magnitude of a detection gap δa will not change. In addition, the active rotation detecting sensor 15b can secure the magnitude of its output signal, even if the detection interval δa is slightly large. Consequently, the above-mentioned problem can be solved. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
