JP4829824B2 - Rolling bearing with rotation sensor - Google Patents

Description

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

  In the rolling bearing with rotation sensor, a magnetic encoder magnetized alternately in the N and S poles in the circumferential direction is mounted on the rotating race of the inner and outer races. There is one in which a sensor holding member that holds a magnetic sensor for detecting a change in magnetic flux is attached to a fixed raceway to detect the rotation of the rotary raceway (see, for example, Patent Document 1). In the device described in Patent Document 1, the sensor holding member is fixed to an annular cored bar that is fitted to the radial end of the fixed raceway on the raceway surface side, and the magnetic encoder is fixed on the raceway side diameter of the rotary raceway. It is fixed to an annular core bar fitted to the surface end.

  On the other hand, some rolling bearings such as deep groove ball bearings are provided with annular seal grooves for attaching seals on both sides of the raceway surface of one of the inner ring and outer ring. In some cases, annular seal grooves are provided on both sides of the raceway surface of the other raceway so that the tip of the seal is inserted or slidably contacted.

  In the one described in Patent Document 1, the annular seal grooves provided on both sides of the raceway surfaces of the inner ring and outer ring of the deep groove ball bearing are eliminated on one side, and the core metal to which the sensor holding member is fixed and the core metal to which the magnetic encoder is fixed. Are attached to the end portions of the radial surface from which these seal grooves are eliminated by fitting.

JP 2002-349556 A

  In the rolling bearing with a rotation sensor described in Patent Document 1, it is necessary to eliminate the seal groove provided on the raceway on one side in order to attach the core metal to which the sensor holding member and the magnetic encoder are fixed to the outer ring and the inner ring. There is a problem that standard rolling bearings cannot be used. Further, since the sensor holding member and the magnetic encoder are mounted on the raceway ring via the annular cored bar, there are problems that the number of parts increases, the number of assembly steps increases, and the manufacturing cost increases.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing with a rotation sensor that can use a standard rolling bearing having a seal groove on a bearing ring and that has a small number of parts.

  In order to solve the above-mentioned problems, the present invention mounts a magnetic encoder magnetized alternately on the north and south poles in the circumferential direction on the rotating raceway of the inner and outer raceways. In a rolling bearing with a rotation sensor for detecting rotation of the rotating raceway ring, a sensor holding member that holds a magnetic sensor that detects a change in magnetic flux accompanying rotation of the magnetic encoder is attached to the fixed raceway ring. It is assumed that annular seal grooves are provided on both sides of the raceway surface, and the sensor holding member is formed in an annular shape having a protrusion that engages with the seal groove, and the protrusion is fitted into one of the seal grooves. And adopting a configuration that is mounted on the fixed race.

  That is, it is assumed that the fixed race is provided with an annular seal groove on both sides of the raceway surface, the sensor holding member is formed in an annular shape having a ridge that engages with the seal groove, and the ridge is formed on the seal groove. A standard rolling bearing with a seal groove provided in the fixed raceway can be used by fitting it in one side and attaching it to the fixed raceway, so that the core of the sensor holding member is not required and the number of parts can be reduced. did.

  By forming a projecting portion that protrudes outward in the axial direction on the sensor holding member, and providing a sensor housing portion that houses the magnetic sensor inside the projecting portion, a housing that forms the sensor housing portion is unnecessary. The number of parts can be reduced.

  The sensor housing portion may be provided with an opening directed in a radial direction for magnetic flux detection of the magnetic sensor and an opening directed outward in the axial direction for derivation of an output cable of the magnetic sensor.

  By providing the sensor holding member with a cut portion having a gap in one place in the circumferential direction, the diameter of the sensor holding member can be expanded and reduced and can be easily fitted in the seal groove.

  When the fixed raceway is an outer ring, the sensor holding member provided with the cutting portion can be fitted into the seal groove by reducing the diameter so as to narrow the interval between the cutting portions.

  The sensor holding member can be firmly fixed by expanding the diameter of the sensor holding member that has been reduced in diameter and fitted in the seal groove with an elastic body that widens the interval between the cut portions, and fixing it to the seal groove. it can.

  The rotating race is provided with annular seal grooves on both sides of the raceway surface, the magnetic encoder is formed of a rubber magnet, and a protrusion that engages the seal groove with the magnetic encoder formed of the rubber magnet. And mounting the magnetic encoder by fitting the protrusion into the seal groove of the rotating raceway on the same side as the seal groove of the fixed raceway to which the sensor holding member is attached. In addition, standard rolling bearings with seal grooves can be used, the core bar of the magnetic encoder is unnecessary, and the number of parts can be reduced.

  The magnetic encoder can be easily and firmly fixed by fixing the magnetic encoder of the rubber magnet attached to the seal groove to the seal groove with the tight binding force of the rubber using the rotating raceway as the inner ring.

  In the rolling bearing with a rotation sensor of the present invention, the fixed bearing ring is provided with annular seal grooves on both sides of the raceway surface, and the sensor holding member is formed in an annular shape having a protrusion that engages with the seal groove. Because this ridge is fitted into one of the seal grooves and attached to the fixed race, a standard rolling bearing with a fixed groove on the fixed race can be used and the number of parts can be reduced. The number of assembly steps can be reduced and the manufacturing cost can be reduced.

  By forming a protruding portion that protrudes outward in the axial direction on the sensor holding member and providing a sensor storage portion that stores the magnetic sensor inside the protruding portion, a housing that forms the sensor storage portion is unnecessary, and more components The score can be reduced.

  By providing the sensor holding member with a cut portion having a gap in one place in the circumferential direction, the diameter of the sensor holding member can be expanded and reduced and can be easily fitted in the seal groove.

  When the fixed raceway is an outer ring, the sensor holding member provided with the cutting portion can be reduced in diameter so as to narrow the interval between the cutting portions and can be fitted into the seal groove.

  The sensor holding member can be firmly fixed by expanding the diameter of the sensor holding member that has been reduced in diameter and fitted in the seal groove with an elastic body that widens the interval between the cut portions, and fixing it to the seal groove.

  The rotary raceway is provided with annular seal grooves on both sides of the raceway surface, the magnetic encoder is formed of a rubber magnet, and a protrusion that engages with the seal groove is provided on the magnetic encoder formed of the rubber magnet. By installing the magnetic encoder into the seal groove of the rotating raceway on the same side as the seal groove of the fixed raceway to which the sensor holding member is attached, a seal groove is also provided on the rotary raceway ring. The standard rolling bearings can be used, the core bar of the magnetic encoder is unnecessary, and the number of parts can be further reduced.

  The magnetic encoder can be easily and firmly fixed by fixing the magnetic encoder of the rubber magnet attached to the seal groove to the seal groove with the tight binding force of the rubber using the rotating raceway as the inner ring.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment. As shown in FIGS. 1 and 2, the rolling bearing with a rotation sensor includes a plurality of rolling bearings between a raceway surface 1a of an outer ring 1 that is a fixed raceway and a raceway surface 2a of an inner ring 2 that is a rotary raceway. Is a deep groove ball bearing in which seal grooves 1b and 2b are provided on both sides of each raceway surface 1a and 2a of the outer ring 1 and the inner ring 2, and the ball 3 is held in a seal groove 1b on one side of the outer ring 1. A seal 5 is mounted, and the tip of the seal 5 is inserted into the seal groove 2b of the inner ring 2 facing the seal 5.

  A sensor holding member 7 formed in an annular shape for holding the magnetic sensor 6 is fitted into a protrusion 7a provided on the outer diameter side in the seal groove 1b opposite to the side where the seal 5 of the outer ring 1 is mounted. In the seal groove 2b of the inner ring 2 that is mounted on the inner ring 2 and facing this, a magnetic encoder 8 magnetized alternately in the circumferential direction in the N pole and the S pole is fitted with a protrusion 8a provided on the inner diameter side. The magnetic sensor 6 that is attached to and faces the magnetic encoder 8 detects a change in magnetic flux accompanying the rotation of the magnetic encoder 8. For the magnetic sensor 6, a Hall element, Hall IC, MR element or the like is used.

  The magnetic encoder 8 is made of nitrile rubber (NBR), heat-resistant nitrile rubber (HNBR), silicone rubber (VMQ), fluorine rubber (FKM), polyacrylate rubber (ACM), etc., and ferrite or Sm-Fe-N. , Nd—Fe—B, and the like, which are made of a magnetic rubber mixed with a magnetic material, and are firmly fixed to the seal groove 2b by the binding force of the rubber. The magnetic encoder 8 may be magnetized by attaching the molded one to an annular jig, or may be magnetized in a state of being mounted in the seal groove 2b of the single inner ring 2.

  As shown in FIG. 3, the annular sensor holding member 7 is formed with a protruding portion 7b protruding outward in the axial direction, and the magnetic sensor 6 and its detection output are provided inside the protruding portion 7b. A sensor storage unit 9 is provided for storing the circuit board 6a to be processed. The sensor housing 9 is provided with an opening 9a directed inward in the radial direction for magnetic flux detection of the magnetic sensor 6 and an opening 9b directed outward in the axial direction for leading out the output cable 6b of the magnetic sensor 6. Yes. As shown in FIG. 1, the magnetic sensor 6 and the circuit board 6 a stored in the sensor storage unit 9 are fixed by the mold resin 10.

  Further, the sensor holding member 7 is provided with a cut portion 7c having a gap at one place in the circumferential direction, the diameter of the cut portion 7c is reduced to be narrowed, and the sensor holding member 7 is fitted into the seal groove 1b of the outer ring 1. It is. In the sensor holding member 7 fitted in the seal groove 1b, an elastic body 11 made of rubber is inserted between the cut portions 7c from the inner diameter side or the open side in the axial direction. In addition, the sensor holding member 7 should just be elastically deformed so that it may reduce in diameter by the space | interval of the cutting part 7c, and can also be formed with metals, such as stainless steel.

  The elastic body 11 inserted between the cut portions 7c of the sensor holding member 7 presses both end portions of the cut portion 7c with elastic restoring force as shown by arrows in FIG. Is expanded and is firmly fixed to the seal groove 1b. Moreover, the elastic body 11 is latched so that the both ends of the cutting part 7c may be clamped by the flange 11a protruding in an H shape. FIG. 4B shows a modification in which the pressing surfaces at both ends of the cutting portion 7 c pressed by the elastic body 11 are inclined.

  FIGS. 5A, 5B and 5C show a second embodiment. This rolling sensor-equipped rolling bearing has the same basic configuration as that of the first embodiment, and has elastic flanges 11a projecting in the H shape at both ends of the cutting portion 7c of the sensor holding member 7. The difference is that a protrusion 7d is provided to prevent the body 11 from coming off on the inner diameter side. Other parts are the same as those of the first embodiment, and a magnetic encoder 8 made of magnetic rubber is mounted in one seal groove 2b of the inner ring 2.

  In each of the embodiments described above, the rolling bearing is a deep groove ball bearing. However, the rolling bearing with a rotation sensor according to the present invention is not limited to a deep groove ball bearing, and at least a fixed bearing ring of a standard product has a seal groove. It may be provided, and can be applied to other types of rolling bearings. Further, although the outer ring is a fixed raceway and the inner ring is a rotary raceway, the inner ring can be a fixed raceway and the outer ring can be a rotary raceway. A sensor holding member can be attached to the inner ring and a magnetic encoder can be attached to the outer ring.

The longitudinal cross-sectional view which shows the rolling bearing with a rotation sensor of 1st Embodiment Side view of FIG. 1 is an exploded perspective view showing the sensor holding member of FIG. a is a sectional view taken along line IV-IV in FIG. 2, and b is a sectional view showing a modification of a. a is a partially omitted longitudinal sectional view showing a rolling bearing with a rotation sensor of the second embodiment, b is a side view of a, and c is an exploded perspective view showing a sensor holding member of a.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 1a, 2a Raceway surface 1b, 2b Seal groove 3 Ball 4 Cage 5 Seal 6 Magnetic sensor 6a Circuit board 6b Output cable 7 Sensor holding member 7a Projection 7b Projection part 7c Cut part 7d Projection part 8 Magnetic encoder 8a Projection 9 Sensor housing portion 9a, 9b Opening 10 Mold resin 11 Elastic body 11a 鍔

Claims (6)

A magnetic encoder, which is magnetized with N and S poles alternately in the circumferential direction, is mounted on a rotating race of the inner and outer races, and a magnetic for detecting a change in magnetic flux accompanying the rotation of the magnetic encoder. In a rolling bearing with a rotation sensor for detecting rotation of the rotating raceway ring by mounting a sensor holding member for holding a sensor on the fixed raceway ring, annular seal grooves are provided on both sides of the raceway surface of the fixed raceway ring. The sensor holding member is formed of resin in an annular shape having a ridge that engages with the seal groove, and the ridge is fitted into one of the seal grooves and attached to the fixed raceway,
The sensor holding member is provided with a cutting portion with a gap in one place in the circumferential direction,
The fixed race ring is an outer ring, the sensor holding member provided with the cutting portion is reduced in diameter so as to narrow the interval between the cutting portions, and is fitted into the seal groove,
The diameter of the sensor holding member that has been reduced in diameter and fitted in the seal groove is increased by an elastic body that increases the interval between the cut portions, and is fixed to the seal groove .
The elastic body inserted between the cut portions from the inner diameter side or the open side in the axial direction presses both end portions of the cut portions with elastic restoring force, and expands the diameter of the sensor holding member. Rolling bearing with rotation sensor.   The rolling bearing with a rotation sensor according to claim 1, wherein a protrusion that protrudes outward in the axial direction is formed on the sensor holding member, and a sensor storage portion that stores the magnetic sensor is provided inside the protrusion.   3. The rotation sensor according to claim 2, wherein the sensor housing portion is provided with an opening in the radial direction for detecting a magnetic flux of the magnetic sensor and an opening in the axial direction for derivation of an output cable of the magnetic sensor. Rolling bearing with.   The rotating race is provided with annular seal grooves on both sides of the raceway surface, the magnetic encoder is formed of a rubber magnet, and a protrusion that engages the seal groove with the magnetic encoder formed of the rubber magnet. The magnetic encoder is attached by fitting the protrusion into the seal groove of the rotating raceway on the same side as the seal groove of the fixed raceway to which the sensor holding member is attached. A rolling bearing with a rotation sensor according to any one of the above.   The rolling bearing with a rotation sensor according to claim 4, wherein the rotating race is an inner ring, and a magnetic magnet magnetic encoder mounted in the seal groove is fixed to the seal groove by a rubber binding force.   The rolling bearing with a rotation sensor according to claim 1, wherein the elastic body is made of rubber.

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