JP2008128268A - Rolling bearing device with sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid ill effects on the detecting accuracy of a magnetic sensor due to a core metal laid between the magnetic sensor and a pulser. <P>SOLUTION: The rolling bearing device with the sensor comprises: an outer ring 13; an inner ring 14; rolling elements 15 arranged between the outer ring 13 and the inner ring 14; the annular core metal 32 fixed to the outer ring 13; the magnetic sensor 34 integrally provided on the core metal 32; and the pulser 47 provided on the inner ring 14 and adapted to be detected by the magnetic sensor 34. The core metal 32 is shaped with plastic work and laid in at least part between the magnetic sensor 34 and the pulser 47. It is also formed of a non-magnetic material which is hardly magnetized by the plastic work. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  Patent Documents 1 and 2 describe a hub unit having an inner ring (rotation side race ring) to which wheels are attached, an outer ring (fixed side race ring) fixed to a vehicle body, and a rolling element disposed between the inner and outer rings. It has been proposed to provide a sensor device in the (rolling bearing device).

Specifically, an annular cored bar for attaching a seal member that seals between the inner ring and the outer ring is fixed to the outer ring, and a resin member in which a magnetic sensor is embedded in this cored bar is integrated by insert molding, and the rotation side track A pulser that is detected by a magnetic sensor is provided on the wheel.
Japanese Patent Laid-Open No. 2005-133772 JP 2004-264056 A

  In the technique of Patent Document 1, the shape of the cored bar is set so as not to be interposed between the magnetic sensor and the pulser. Conversely, in the technique of Patent Document 2, a part of the cored bar is separated from the magnetic sensor and the pulser. It is designed to be interposed between the two.

  If a cored bar exists between the magnetic sensor and the pulser as in Patent Document 2, the magnetism of the cored bar may adversely affect the detection accuracy of the sensor. Therefore, Patent Document 2 discloses using a nonmagnetic material as the core metal.

  The cored bar has a bent shape so that the elastic seal is brought into contact with the inner ring side, and plastic processing such as press processing is required to obtain such a shape. On the other hand, for example, SUS304, which is an austenitic stainless steel, is known as a non-magnetic metal that can be used as a material for the core metal. SUS304 has a property of being hardened by press work and magnetic. Therefore, when such a material is used for the cored bar, non-magnetization is required so that the detection accuracy of the magnetic sensor does not deteriorate due to magnetism generated by processing.

  The present invention has been made in view of the above circumstances, and provides a rolling bearing device with a sensor that does not adversely affect the detection accuracy of the magnetic sensor due to the core metal interposed between the magnetic sensor and the pulser. The purpose is to do.

The present invention includes a fixed-side race, a rotation-side race, a rolling element disposed between the fixed-side race and the rotation-side race, and an annular core metal fixed to the fixed-side race In a rolling bearing device with a sensor, comprising: a magnetic sensor integrally provided on the core metal; and a pulser provided on the rotating raceway and detected by the magnetic sensor,
The core metal is formed by plastic processing, and at least a part thereof is interposed between the magnetic sensor and the pulser, and is further made of a non-magnetic material that is not easily magnetized by the plastic processing. .

  According to this, even if the cored bar is molded by, for example, press working or the like, it is not magnetized by the working and does not adversely affect the detection accuracy of the magnetic sensor.

  For example, SUS304L or SUS305 can be used as the nonmagnetic material constituting the cored bar.

  The core metal includes an outer cylindrical portion that is fitted and fixed to the fixed-side race, a first flange portion that extends radially inward from an axially inner end of the outer cylindrical portion, and a first flange portion. An inner circumferential cylindrical portion extending from the radially inner end of the inner circumferential portion to the outer side in the axial direction between the magnetic sensor and the pulsar, and from the axial outer end of the inner circumferential cylindrical portion toward the rotating raceway It is preferable that the 2nd flange part is provided, and the said 2nd flange part is provided with the sealing body which seals between the said rotation side bearing ring side.

  In this case, the pulsar is covered from the outside in the axial direction by the second flange portion and the seal body, and the pulsar can be protected from water or the like that is about to enter the bearing device.

  According to the present invention, the detection accuracy of the magnetic sensor is not adversely affected by the cored bar interposed between the magnetic sensor and the pulser.

  FIG. 1 is a sectional view of a rolling bearing device 10 according to an embodiment of the present invention, and FIG. 2 is a front view of the rolling bearing device 10. The rolling bearing device 10 includes a hub unit 11 and a sensor device 12. The hub unit 11 includes an outer ring (fixed-side track ring) 13 fixed to the vehicle body side, an inner ring (rotation-side track ring) 14 to which the wheel is attached, and a plurality of balls (between the outer ring 13 and the inner ring 14 ( Rolling element) 15 and a cage 16 for holding the ball 15.

  In FIG. 1, the left side of the hub unit 11 is the vehicle body side (inner side), and the right side is the wheel side (outer side). In addition, the direction from the central side in the axial direction of the hub unit 11 toward the inner side and the outer side is referred to as the axially outward direction, and the direction from the inner side and the outer side toward the central side in the axial direction of the hub unit is axially inward. That's it.

The outer ring 13 includes a cylindrical portion 19 having two rows of raceway surfaces 19 </ b> A on the inner peripheral surface, and a flange portion 20 that protrudes radially outward from the outer peripheral surface of the cylindrical portion 19. The outer ring 13 is attached to the vehicle body by bolts at the flange portion 20.
The inner ring 14 includes a hub ring 22 and a cylindrical ring 23 fitted to the outer peripheral surface on the inner side of the hub ring 22. The hub wheel 22 has a cylindrical portion 24 and a flange portion 25 protruding radially outward from the outer peripheral surface of the cylindrical portion 24, and a wheel is attached to the flange portion 25 with a bolt. One row of raceway surfaces 24A and 23A are formed on the outer circumference surface of the cylindrical portion 24 and the outer circumference surface of the cylindrical ring 23, and between these raceway surfaces 24A and 23A and the raceway surface 19A formed on the outer ring 13. A plurality of balls 15 are arranged in two rows in the axial direction.

  An elastic seal 27 is provided between the inner peripheral surface of the outer side end portion of the outer ring 13 and the outer peripheral surface of the cylindrical portion 24 of the hub ring 22 to prevent mud from entering the bearing. In addition, a seal device 28 that similarly prevents intrusion of mud or the like is provided at inner end portions of the outer ring 13 and the inner ring 14.

FIG. 3 is an enlarged cross-sectional view showing the main part of the present invention. The seal device 28 includes a fixed side seal member 30 fixed to the outer ring 13 and a rotation side seal member 31 fixed to the inner ring 14.
The fixed-side seal member 30 includes a cored bar 32, a resin member 33 integrated with the cored bar 32 by insert molding, a sensor 34 disposed in the resin member 33, and an elastic seal (bonded to the cored bar 32). Sealing body) 35.

  The cored bar 32 is formed in an annular shape, and includes an outer peripheral side cylindrical portion 37 extending along the axial direction at an outer end portion in the radial direction, and extends radially inward from an outer side end portion of the cylindrical portion 37. The outer side flange portion (first flange portion) 38 is provided. The outer side flange portion 38 includes an inner peripheral side cylindrical portion 39 extending from the radially inner end portion to the inner side along the axial direction. The inner side flange portion (second flange portion) 40 extending radially inward from the inner side end portion of the inner side is provided. The cylindrical portions 37 and 39 and the flange portions 38 and 40 are integrally formed by pressing (deep drawing) a metal plate.

The outer peripheral side cylindrical portion 37 of the cored bar 32 constitutes a fitting portion that fits to the inner peripheral surface of the inner side end portion of the outer ring 13, and the inner side flange portion 40 is between the rotary side seal member 31. The seal attachment part for attaching the elastic seal 35 which seals is comprised.
The resin member 33 is formed in an annular shape, and the inner side end portion of the outer peripheral side cylindrical portion 37 of the cored bar 32 is integrated by insert molding. The resin member 33 is filled in a space S surrounded by the outer peripheral side cylindrical portion 37, the outer side flange portion 38, and the inner peripheral side cylindrical portion 39 of the cored bar 32.

  As shown in FIG. 1, the upper portion of the resin member 33 is provided with a protruding portion 41 that protrudes to the inner side and the radially outer side. A connector portion 42 for integrally attaching a harness connecting the signal processing means provided on the vehicle body side and the sensor 34 is integrally formed at the upper end of the protruding portion 41. The connector portion 42 is provided with a connector pin 43 for signals, and the sensor 34 and the connector pin 43 are connected via a lead wire 44 and the like. The sensor device 12 is configured by the sensor 34, the connector portion 42, the connector pin 43, the lead wire 44, the signal processing means, and the like. The sensor device 12 is incorporated in the hub unit 11 as an ABS sensor.

The sensor 34 is a magnetic sensor and is disposed in the resin member 33 in the space S as shown in FIG. The sensing surface 34a of the sensor 34 faces inward in the radial direction.
As shown in FIG. 3, the rotation-side seal member 31 includes a slinger 46 fixed to the inner ring 14 and a pulsar 47 fixed to the outer peripheral surface of the slinger 46.

  The slinger 46 is formed in a substantially L-shaped cross section by a cylindrical portion 48 extending along the axial direction and a flange portion 49 extending radially outward from an inner side end portion of the cylindrical portion 48. The outer side of the cylindrical portion 48 is fitted to the inner side outer peripheral surface of the cylindrical ring 23 in the inner ring 14. The inner side of the cylindrical portion 48 protrudes in the axial direction from the cylindrical ring 23 toward the inner side.

  The pulsar 47 outputs a rotation signal by alternately arranging N poles and S poles, and includes a support member 50 and a magnetized body 51. The support member 50 is formed in an annular shape from a magnetic metal such as SUS430. The support member 50 is formed in a substantially U-shaped cross section, and a magnetized body 51 is bonded to the outer peripheral surface, and the magnetized body 51 is crimped in the inner peripheral direction on both sides in the axial direction of the outer peripheral surface to prevent the support member 50 from coming off. Has been. The inner peripheral surface of the support member 50 is fitted to the outer peripheral surface of the cylindrical portion 48 of the slinger 46. The magnetized body 51 is formed by magnetizing magnetic powder using rubber as a binder, and faces the sensing surface 34 a of the sensor 34 embedded in the resin member 33.

  The inner side outer peripheral surface of the cylindrical portion 48 of the slinger 46 and the outer side surface of the flange portion 49 are seal receiving surfaces with which the elastic seal 35 of the fixed side seal member 30 abuts. The elastic seal 35 includes lip portions 35 a and 35 b that are in contact with the outer peripheral surface of the cylindrical portion 48, and a lip portion 35 c that is in contact with the outer side surface of the flange portion 49, and the inner peripheral surface of the resin member 33 and the slinger 46. Intrusion of water or the like (indicated by an arrow a) into the bearing device 10 from the gap between the radially outer end portions is prevented.

  The pulsar 47 is radially outwardly covered by the inner peripheral cylindrical portion 39 of the core metal 32, and the inner side (axially outer side) is covered by the inner flange portion 40 of the core metal 32 and the elastic seal 35. Therefore, it is completely protected from intruding water or the like as indicated by an arrow a.

  The outer peripheral side cylindrical portion 37, the outer side flange portion 38, and the inner peripheral side cylindrical portion 39 of the cored bar 32 are bonded to the resin member 33. Therefore, the cored bar 32 and the resin member 33 can be firmly bonded with a large bonding area.

  An inner peripheral cylindrical portion 39 of the core metal 32 is interposed between the sensor 34 and the pulser 47. Therefore, if the cored bar 32 is magnetized, it may adversely affect the detection of the pulser 47 by the sensor 34. Therefore, in this embodiment, a non-magnetic material is used as the cored bar 32.

  Further, as described above, the cored bar 32 is bent at a plurality of locations to form the outer peripheral side cylindrical portion 37, the outer side flange portion 38, the inner peripheral side cylindrical portion 39, and the inner side flange portion 40. Molded by processing. Some metals, even non-magnetic materials, undergo work hardening by plastic working and are magnetized at the same time. For example, SUS304, which is an austenitic stainless steel, has the property that when cold working such as deep drawing is performed, the structure undergoes martensitic transformation and hardness and magnetism increase.

  For this reason, in the present embodiment, a nonmagnetic material that is difficult to be magnetized by plastic working is used instead of a nonmagnetic material as the core metal 32. Specifically, austenitic stainless steel SUS304L, SUS305, or the like is used. Therefore, even if the core metal 32 is bent in a complicated manner and is interposed between the sensor 34 and the pulser 47 as in the present embodiment, the detection accuracy of the sensor 34 is not affected. Note that SUS304L has less carbon and more nickel than SUS304.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the material of the cored bar 32 is not limited to those described in the above embodiment, and any material that is difficult to be magnetized by plastic working can be used. The types of plastic processing include deep drawing processing and bending processing classified into press processing, and the material of the cored bar 32 to be selected can be selected according to processing conditions such as processing method and temperature. it can. Further, not only the cored bar 32 but also the support member 50 and the slinger 46 can be made of a nonmagnetic material. Further, the support member 50 for supporting the magnetized body 51 may be omitted, and the thickness of the magnetized body 51 may be increased so as to have the same outer diameter as when the support member 50 is used.

It is sectional drawing of the rolling bearing apparatus which concerns on embodiment of this invention. It is a front view of a rolling bearing device. It is sectional drawing which expands and shows the principal part of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rolling bearing apparatus 12 Sensor apparatus 13 Outer ring 14 Inner ring 28 Sealing apparatus 32 Core metal 34 Sensor 47 Pulsar 50 Support member

Claims (3)

A fixed-side raceway, a rotation-side raceway, a rolling element disposed between the fixed-side raceway and the rotation-side raceway, an annular cored bar fixed to the fixed-side raceway, and the core In a rolling bearing device with a sensor, comprising: a magnetic sensor provided integrally with gold; and a pulsar provided on the rotating raceway wheel and detected by the magnetic sensor,
The cored bar is formed by plastic working, and at least a part thereof is interposed between the magnetic sensor and the pulser, and is further made of a nonmagnetic material that is difficult to be magnetized by the plastic working. Rolling bearing device with sensor.   The rolling bearing device with a sensor according to claim 1, wherein the nonmagnetic material constituting the cored bar is SUS304L or SUS305.   An outer peripheral side cylindrical portion in which the core metal is fitted and fixed to the fixed-side raceway, a first flange portion extending radially inward from an axially inner end of the outer peripheral side cylindrical portion, and a first flange portion An inner circumferential cylindrical portion extending from the radially inner end of the inner circumferential portion to the outer side in the axial direction between the magnetic sensor and the pulsar, and from the axial outer end of the inner circumferential cylindrical portion toward the rotating raceway 3. A sensor according to claim 1, further comprising: a second flange portion that extends, and a seal body that seals between the second flange portion and the rotating raceway side. Rolling bearing device.

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