JP2007303566A - Rolling bearing with rotation sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing with a rotation sensor for allowing the use of a standard rolling bearing with seal grooves, as it is. <P>SOLUTION: Both core metals 7, 9 of a magnetic encoder 6 and a sensor unit 8 have bent portions 7a, 9a, respectively, to be fitted into the U-shaped seal grooves 1b, 2b of an inner ring 1 and an outer ring 2. With the bent portions 7a, 9a fitted into the seal grooves 1b, 2b, both core metals 7, 9 are fixed to the inner ring 1 and the outer ring 2, respectively. This eliminates the need for additional machining to remove the seal grooves 1b, 2b of the inner ring 1 and the outer ring 2 at their single sides and allows the use the standard rolling bearing with the seal grooves 1b, 2b, as it is. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing with a rotation sensor.

  In a rolling bearing with a rotation sensor, a magnetic encoder magnetized with a plurality of magnetic poles in the circumferential direction is mounted on a rotating raceway of an inner ring and an outer ring, and a change in magnetic flux accompanying the rotation of the magnetic encoder is detected. There is one in which a sensor unit containing a magnetic sensor is mounted on a fixed raceway to detect the rotation of the rotary raceway (see, for example, Patent Document 1).

  Conventionally, in this type of rolling bearing with a rotation sensor, as described in Patent Document 1, a magnetic encoder is inserted through an annular cored bar that is fitted to a radial surface end of the rotating raceway on the raceway surface side. In many cases, the sensor unit is mounted via an annular cored bar that is fitted to a radial surface end portion on the raceway surface side of the fixed raceway.

  On the other hand, some rolling bearings such as deep groove ball bearings are provided with U-shaped seal grooves for mounting a seal and inserting a seal lip facing each other on both sides of raceways of an inner ring and an outer ring. In the one described in Patent Document 1, one of the U-shaped seal grooves provided on both sides of the raceways of the inner ring and the outer ring is removed, and the annular core bar of the magnetic encoder or sensor unit is removed. Are fixed to the end portions of the inner ring and the outer ring from which the seal grooves are removed by fitting.

JP 2002-349556 A

  The rolling bearing with a rotation sensor described in Patent Document 1 is a U for use in attaching a seal to an inner ring or an outer ring and for inserting a seal lip in order to fix the core of a magnetic encoder or sensor unit to the inner ring and the outer ring by fitting. It is necessary to remove the letter-shaped seal groove on one side. For this reason, a standard rolling bearing cannot be used, and there is a problem that the cost for additional processing for removing the seal groove increases. Further, since the bearing from which the seal groove is removed on one side is asymmetric in the axial direction, it is necessary to manage the direction of the bearing.

  Therefore, an object of the present invention is to make it possible to use a standard rolling bearing provided with a seal groove in a rolling bearing with a rotation sensor as it is.

  In order to solve the above-described problems, the present invention provides a plurality of rolling elements arranged between the raceway surfaces of the inner ring and the outer ring facing each other, and seal mounting and seals are provided on both sides of the raceway surfaces of the opposed inner ring and outer ring. A U-shaped seal groove for lip insertion is provided opposite to each other, and a magnetic encoder magnetized by a plurality of magnetic poles in the circumferential direction is provided on the rotating raceway of these inner and outer rings with an annular cored bar. Rotating to detect rotation of the rotating raceway by attaching a sensor unit containing a magnetic sensor for detecting a change in magnetic flux accompanying rotation of the magnetic encoder to the other fixed raceway with an annular cored bar. In a sensor-equipped rolling bearing, bend portions that are fitted into U-shaped seal grooves of the inner ring and the outer ring are provided on both core bars of the magnetic encoder and the sensor unit, respectively, and the bent portions are fitted into the seal grooves. , Employing the configuration to fix the both metal core, respectively inner and outer rings.

  That is, the core bars of the magnetic encoder and the sensor unit are provided with bent portions that are fitted into the U-shaped seal grooves of the inner ring and the outer ring, respectively, and the core bars are respectively inserted into the inner rings by fitting these bent portions into the seal grooves. By fixing to the outer ring, a standard rolling bearing with a seal groove can be used as it is without the need for additional processing to remove the seal groove on the inner ring and the outer ring on one side.

  By inserting a plurality of slits extending in the bending direction into the bent portion of the annular metal core, the bent portion can be easily elastically deformed, and the bent portion can be easily fitted into the seal groove. In addition, the plastic deformation of the bent portion can be facilitated, and the bent portion fitted in the seal groove can be crimped.

  The rolling bearing with a rotation sensor according to the present invention is provided with bent portions fitted into U-shaped seal grooves of the inner ring and the outer ring on both cores of the magnetic encoder and the sensor unit, and these bent portions are fitted into the seal grooves. Since both cores are fixed to the inner ring and the outer ring respectively, standard rolling bearings with seal grooves can be used as they are without the need for additional processing to remove the inner and outer ring seal grooves on one side. It can be.

  By inserting a plurality of slits extending in the bending direction into the bent portion of the annular metal core, the bent portion can be easily elastically deformed, and the bent portion can be easily fitted into the seal groove. In addition, the plastic deformation of the bent portion can be facilitated, and the bent portion fitted in the seal groove can be crimped.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this rolling bearing with a rotation sensor, as shown in FIG. 1, a ball 3 is provided between a raceway surface 1a of an inner ring 1 as a rotating raceway and a raceway surface 2a of an outer race 2 as a fixed raceway. The U-shaped seal grooves 1b, 2b are provided on both sides of the raceway surface 1a of the inner ring 1 and on both sides of the raceway surface 2a of the outer ring 2, respectively. The seal lip 5a of the seal 5 mounted in the one-side seal groove 2b is inserted into the seal groove 1b on one side of the opposing inner ring 1.

  A bent portion 7 a provided in an annular cored bar 7 of the magnetic encoder 6 is fitted into the seal groove 1 b of the inner ring 1 on the side opposite to the side where the seal 5 is mounted, so that the magnetic encoder 6 is fixed to the inner ring 1. A bent portion 9 a provided in the annular cored bar 9 of the sensor unit 8 is fitted into the seal groove 2 b of the outer ring 2 facing the seal groove 1 b of the inner ring 1, and the sensor unit 8 is fixed to the outer ring 2. Has been.

  The magnetic encoder 6 is obtained by vulcanizing and bonding a magnetic rubber 6 a magnetized to a plurality of magnetic poles in the circumferential direction on the outer diameter surface of an annular cored bar 7. The sensor unit 8 is fitted to the inner diameter surface of the annular cored bar 9, and detects a change in magnetic flux accompanying the rotation of the magnetic encoder 6, and a processing circuit 8b that processes the detection output of the magnetic sensor 8a. Is stored.

  As shown in FIG. 2, a plurality of slits 7b extending in the bending direction to the end face are inserted in the bent portion 7a of the cored bar 7 of the magnetic encoder 6 in order to facilitate the elastic deformation thereof. Although illustration is omitted, a similar slit is also formed in the bent portion 9 a of the core 9 of the sensor unit 8.

  In the embodiment described above, the rolling bearing with a rotation sensor is a deep groove ball bearing. However, the rolling bearing with a rotation sensor according to the present invention is provided with U-shaped seal grooves on both sides of the raceway surface of the standard inner ring and outer ring. It can be applied to other types of rolling bearings.

Longitudinal sectional view showing an embodiment of a rolling bearing with a rotation sensor The perspective view which shows the magnetic encoder of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 1a, 2a Raceway surface 1b, 2b Seal groove 3 Ball 4 Cage 5 Seal 6 Magnetic encoder 6a Magnetic rubber 7 Core metal 7a Bending part 7b Slit 8 Sensor unit 8a Magnetic sensor 8b Processing circuit 9 Core metal 9a Bending part

Claims (2)

  A plurality of rolling elements are arranged between the raceway surfaces facing the inner ring and the outer ring, and U-shaped seal grooves for attaching a seal and inserting a seal lip are opposed to both sides of the raceway surfaces of the opposed inner ring and outer ring. A magnetic encoder magnetized with a plurality of magnetic poles in the circumferential direction is attached to the rotating raceway of these inner ring and outer ring with an annular cored bar, and the magnetic encoder is attached to the other fixed raceway ring. In a rolling bearing with a rotation sensor for detecting the rotation of the rotating raceway ring by mounting a sensor unit containing a magnetic sensor for detecting a change in magnetic flux accompanying rotation of a ring with a circular cored bar, the magnetic encoder, the sensor unit, The core bars are provided with bent portions that are fitted into the U-shaped seal grooves of the inner ring and the outer ring, respectively, and the core bars are fixed to the inner ring and the outer ring by fitting the bent portions into the seal grooves, respectively. Rolling bearing with a rotation sensor, characterized in that the.   The rolling bearing with a rotation sensor according to claim 1, wherein a plurality of slits extending in a bending direction are provided in a bending portion provided in the annular cored bar.

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