JP2010190281A5 - - Google Patents

Claims (4)

A plurality of rolling elements that are rotatably arranged between a rotatable wheel, a fixed wheel that rotatably supports the rotating wheel, and a raceway surface that the rotary wheel has and a raceway surface that the fixed wheel has. And a rotation sensor for detecting the rotation of the rotating wheel,
The rotation sensor has a detected portion attached to the rotating wheel so as to be rotatable integrally with the rotating wheel, and at least one detection portion attached to the fixed wheel via a sensor housing, In the rolling bearing with a rotation sensor in which the rotation of the detected part accompanying the rotation of the rotating wheel is detected by the detection part,
The detected portion has a first labyrinth forming portion that extends in the bearing width direction and protrudes to the outer side in the bearing width direction from the side surface of the rotating wheel, and the sensor housing has a gap with the first labyrinth forming portion. And a second labyrinth forming portion opposed in the radial direction, and a labyrinth structure is formed between the first labyrinth forming portion and the second labyrinth forming portion facing each other. Rolling bearing with sensor. The detected portion includes a magnet and a magnet holder for attaching the magnet to the rotating wheel, and the detecting portion includes a magnetic sensor opposed to the magnet in a radial direction with a gap therebetween, thereby utilizing magnetism. 2. The rolling bearing with a rotation sensor according to claim 1, wherein the rotation sensor configured to detect rotation of the rotating wheel is configured, and the first labyrinth forming portion is formed in the magnet holder. . A sensor cover that covers an outer surface of the sensor housing, wherein the magnet holder has a substantially U-shaped cross section, and the magnet holder and the sensor cover are made of a magnetic material, so that magnetism against an external magnetic flux can be obtained. The rolling bearing with a rotation sensor according to claim 2, which constitutes a shield. The detected portion is made of an annular member made of a magnetic material, and the detecting portion is made of a magnetic back yoke, a magnetic sensor facing the annular member in a radial direction with a gap, the back yoke, and the The rotation sensor configured to detect the rotation of the rotating wheel using magnetism, and the first labyrinth forming portion is formed on the annular member. The rolling bearing with a rotation sensor according to claim 1, wherein the rolling bearing is formed.