To provide a bearing with a rotation sensor hardly generating a damage of a magnetic encoder caused by biting of massive dust or sand particles or the like, capable of detecting not only a rotational frequency but also a rotation detection, and detecting with high reliability.
A rolling bearing 10 is provided with a sensor part 6 for detecting rotation. The sensor part 6 comprises the magnetic encoder 17 mounted on a member 54 on the rotation side between an inward member 54 and an outward member 55 of the rolling bearing 10, and a magnetic sensor 18 mounted on a member 55 on the fixed side oppositely to the magnetic encoder. The sensor part 6 outputs two rotational frequency signals having a phase difference of about 90°. The magnetic encoder 17 comprises a multipolar magnet 17a on which magnetic poles are formed alternately in the circumferential direction, and a core bar 17b for supporting the multipolar magnet 17a. The multipolar magnet 17a is a sintered body formed by sintering mixed powder of magnetic powder and nonmagnetic metal powder.
OHIRA AKINARI
MATSUI ARIHITO
FUKADA KIKUO
Shuji Sugimoto