JP2008256600A - Rotation speed detection device and rolling bearing device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation speed detection device and a rolling bearing device for a wheel using the same improved for inhibiting the positional variations in the radial direction by press-fitting the magnetized member. <P>SOLUTION: A connection part 70 is smoothly bent, and the cross-sectional surface including a central axial line of core metal 66 for fixing the magnetized member is substantially U-shaped. When a cylindrical part 69 of small diameter is force fitted to the slinger, deforms in the radial direction to the out side. Because the connection part 70 is bent smoothly, having large elasticity in the radial direction, it makes the bending rate increase by receiving the deformation of the small cylindrical diameter part 69 and absorbs positional change in the radial direction, to the outside. Accordingly, although the magnetized member fixing core metal 66 as a whole is the width of the radial direction becomes small (thin), a cylinder part of large diameter receiving the deformation of the cylindrical part 68 of large diameter, in the radial direction to the out side, is inhibited by the deformation of the connection part 70. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotation speed detection device, and more particularly to a rotation speed detection device that detects the rotation speed of a wheel of an automobile. The present invention also relates to a rolling bearing device using the rotational speed detection device.

  With the widespread use of anti-lock brake systems, it is necessary to provide a rotational speed detection device that detects the rotational speed of wheels used in the system, and this device is installed in a rolling bearing device. Therefore, it is necessary to downsize the rotation speed detection device.

For example, in the technique disclosed in Patent Document 1, the sealing device that seals the gap between the fixed member and the rotating member and the rotation speed detecting device are integrated to achieve downsizing around the wheel as a whole. ing. That is, the sensor is fixed inside the fixed-side seal member, and the magnetized body is fixed inside the rotation-side seal member, so that the seal device and the rotation speed detection device are integrated. Here, the rotation side seal member integrates the magnetized ring and the slinger and press-fits the fixed member.
JP 2000-346858 A

  However, in general, when the members are assembled by press-fitting, variation in the radial position will occur unless the amount of deformation by press-fitting is made constant. In particular, as in Patent Document 1, if the radial position of the support member (slinger) that fixes the magnetized body (magnetized ring) in the fixed-side seal member varies, the crystal gap between the sensor and the magnetized body It becomes difficult to keep the air gap constant. In addition, depending on the product, another member may be press-fitted into the fixing member, and further the support member may be press-fitted from above. In such a case, since the press-fitting is combined twice, There is a possibility that the positional variation in the radial direction will increase.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide an improved rotational speed detecting device and a rolling bearing device for a wheel using the rotational speed detecting device which can suppress variation in radial position of a magnetized body due to press-fitting. To do.

  A rotational speed detection device according to the present invention is a rotational speed detection device that detects a rotational speed of a rotating member by detecting a magnetic change caused by rotation of the rotating member including a magnetized body by a sensor. A first cylindrical portion to which the magnetized body is fixed; a sealing core metal that is press-fitted into the rotating member; a second cylindrical portion that is press-fitted into the sealing core metal; and the first and second A rotational speed detection apparatus comprising: a connecting portion for connecting a cylindrical portion; and a magnetic sensor disposed so as to face the magnetized body, wherein at least one of the second cylindrical portion and the connecting portion has elasticity.

  Since at least one of the second cylindrical portion and the connecting portion has elasticity, the deformation generated in the second cylindrical portion press-fitted into the sealing metal core has the elasticity of the second cylindrical portion itself or the connecting portion. Absorbed by elasticity. Therefore, it is possible to suppress the occurrence of radial displacement in the first cylindrical portion to which the magnetized body is fixed.

  In the rotational speed detection device according to the present invention, the connecting portion is preferably bent.

  The deformation generated in the second cylindrical portion press-fitted into the sealing metal core extends to the connecting portion. However, since the connecting portion is bent, it has elasticity in the radial direction of the cylindrical portion, and absorbs deformation in the radial direction by elasticity. Therefore, it is possible to suppress the occurrence of radial displacement in the first cylindrical portion to which the magnetized body is fixed.

  The rotational speed detection device according to the present invention may have a structure having a notch or a hole in at least one of the second cylindrical portion and the connecting portion.

  Since at least one of the second cylindrical portion and the connecting portion has a notch or a hole, the periphery of the notch or the hole is easily deformed. Therefore, the deformation generated in the second cylindrical portion press-fitted into the sealing metal core is absorbed by the deformation of the notched portion or the portion provided with the hole, and the first cylindrical portion to which the magnetized body is fixed is absorbed. Suppressing occurrence of radial displacement.

  The rotational speed detection device according to the present invention is a rotational speed detection device having the hole portion in the connection portion, and has a substantially parallelogram-shaped hole portion in the connection portion. According to this configuration, the deformation due to the press-fitting is absorbed when the connecting portion is deformed in such a manner that the inclination of the hypotenuse of the parallelogram changes, so that the cylindrical portion to which the magnetized body is fixed is prevented from being deformed.

  The rotational speed detection device according to the present invention has the cutout portion in the second cylindrical portion and the connecting portion. According to this configuration, the peripheral portion of the notch portion has elasticity, and the deformation due to the press-fitting is absorbed by being deformed so as to change the notch width. Therefore, the second cylindrical portion to which the magnetized body is fixed is attached. Suppressing occurrence of radial displacement.

  Moreover, the rotational speed detection apparatus concerning this invention is used suitably for the rolling bearing apparatus for wheels.

  According to the present invention, it is possible to suppress a change in the radial position of the magnetized body due to the press-fitting, and therefore, variation in the radial position of the magnetized body can be reduced. Therefore, the crystal gap and the air gap between the sensor and the magnetized body can be made constant.

  (First embodiment)

  The first embodiment is an embodiment in which the rotational speed detection device according to the present invention is integrated with a seal device and applied to a rolling bearing device. Hereinafter, a first embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the rolling bearing device according to the first embodiment cut along a plane including an axis. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a view of the rolling bearing device according to the first embodiment as viewed from the vehicle body side. 1 to 3, the same parts are denoted by the same reference numerals, and FIGS. 1 to 3 are also referred to in the following description.

First, the configuration of the rolling bearing device will be described in order.
The hub unit 1 includes a vehicle body side track member 3 fixed to the vehicle body side, a wheel side track member 4 to which a wheel is attached, and a plurality of hub units 1 arranged in two rows between the vehicle body side track member 3 and the wheel side track member 4. Are provided with a ball 5 that is a rolling element and a cage 6 that holds the balls 5 in each row.

  The vehicle body side track member 3 is a substantially cylindrical fixing member, and has a flange 13 to be attached to a knuckle 29 that is a suspension device for the vehicle body with a bolt on an outer peripheral portion. Two rows of outer ring raceways 12 that are in sliding contact with the balls 5 are formed on the inner peripheral surface.

  The wheel-side track member 4 includes a hollow shaft 14 and an inner ring 17. The hollow shaft 14 is a substantially cylindrical rotating member, and is provided with a flange portion 18 to which a plurality of bolts for mounting a wheel are fixed to an outer peripheral portion, and a raceway groove 15 that is in sliding contact with the ball 5. An inner ring 17 is fitted and fixed near the portion. A raceway groove 16 that is in sliding contact with the ball 5 is formed in the inner ring 17 so as to be parallel to the raceway groove 15 of the hollow shaft 14. A seal member 20 made of an elastic seal member and a metal core is provided between the outer end of the vehicle body side track member 3 and the hollow shaft 14.

  Between the end of the inner ring 17 on the vehicle body side and the end of the vehicle body side track member 3 on the vehicle body side, a seal device 7 including the rotational speed detection device 2 is provided. The seal device 7 mainly includes a fixed side seal member 8 fixed to the vehicle body side track member 3 and a rotary side seal fixed to the wheel side track member 4, more specifically, the inner ring 17. It consists of member 9.

  The fixed-side seal member 8 includes a metal core 21, a resin member 22 integrated with the metal core 21 by insert molding, a sensor 11 resin-molded on the metal core 21, and an elastic seal member 65.

  As shown in FIG. 2 which is a partially enlarged view of the sensor peripheral portion, the core metal 21 of the fixed-side seal member 8 is formed in an annular shape by pressing a metal plate. That is, the cored bar 21 is connected to a fitting cylindrical portion 61 that is fitted and fixed to a vehicle body side end portion of the vehicle body side track member 3 and an axially outward end portion of the cylindrical portion 61 so as to be radially inward. A connecting portion 62 extending; a moisture intrusion preventing cylindrical portion 63 extending in the axial direction toward the vehicle body connected to the connecting portion 62; and a flange portion 64 extending inward in the radial direction continuous to the moisture intrusion preventing cylindrical portion 63. is doing. An elastic seal member 65 is bonded to the end of the flange portion 64. In addition, the resin member 22 is molded in a hollow outward in the axial direction formed by the fitting cylindrical portion 61, the connecting portion 62, and the moisture intrusion preventing cylindrical portion 63. The cored bar 21 is made of a nonmagnetic metal such as SUS304 so that lines of magnetic force can easily enter the detection surface of the sensor 11.

  The resin member 22 has an annular shape, and the outer shape of the annular portion is substantially equal to the outer shape of the vehicle body side end portion of the vehicle body side track member 3. Further, an overhanging portion 26 is provided that projects in the axial direction of the vehicle body and in the radial direction from the portion where the sensor 11 of the annular portion is embedded. A connector portion 27 for integrally attaching a harness connecting the processing means (not shown) provided on the vehicle body side and the sensor 11 is integrally formed at the upper end portion of the overhang portion 26. The connector part 27 is provided with a connector pin 28 for signals, and the sensor 11 and the connector pin 28 are connected via a lead wire 30.

  The rotation speed detection device 2 includes a sensor 11 and wiring means such as a connector portion 27 for taking out the output of the sensor 11 to the outside, a connector pin 28 and a lead wire 30, and a signal processing means (not shown). . The sensor 11 is a magnetic sensor, and faces the detection surface inward in the radial direction.

  The rotation-side seal member 9 includes a slinger 33 having a cross-section formed into an L shape by pressing a metal plate, that is, a sealing metal core, and a pulsar 10 fixed to the cylindrical portion 31. The slinger 33 includes a cylindrical portion 31 that is fitted and fixed to an end portion of the inner ring 17 on the vehicle body side, and an outer circumferential flange that extends in a radial direction toward the vehicle body-side track member 3 and continues to the axial vehicle body side end portion of the cylindrical portion 31. Part 32. An elastic seal member 65 fixed to the axial flange portion 64 is in sliding contact with the outer peripheral flange portion 32 and the cylindrical portion 31.

  The pulsar 10 generates magnetic force by alternately arranging N poles and S poles so that the sensor 11 to be combined outputs a rotation signal. The pulsar 10 is bonded to a magnetizing body fixing metal core 66. And a magnetized body 67. The magnetized body 67 is formed by magnetizing magnetic powder using rubber as a binder. The magnetized body 67 has a magnetic force generating surface facing radially outward and is disposed so as to face the detection surface of the sensor 11 described above. Therefore, the magnetic force generated by the pulser 10 can be detected by the sensor 11, thereby detecting the rotation of the wheel side track member 4.

  The magnetizing member fixing metal core 66 of the pulsar 10 includes a large-diameter cylindrical portion 68, a small-diameter cylindrical portion 69, and a connecting portion 70, and the small-diameter cylindrical portion 69 faces outward in the axial direction of the cylindrical portion 31 of the rotary side seal member 9. It is press-fitted into the outer diameter part of the part. The magnetized body 67 is bonded to the outer peripheral cylindrical portion of the large diameter cylindrical portion 68. Bending portions that are bonded to the side surfaces of the connecting portion 70 on the vehicle body side are provided at the vehicle body side end portions of the magnetic bodies 67. The gap between the magnetized body 67 and the moisture intrusion preventing cylindrical portion 63 is set to a value as small as possible within a range where they do not contact each other.

  The sensor 11 is disposed between the fitting cylindrical portion 61 that is a large-diameter cylindrical portion and a moisture intrusion-preventing cylindrical portion 63 that is a small-diameter cylindrical portion, and is disposed in the resin member 22. A wire takeout notch portion 47 for passing the lead wire 30 connecting the sensor 11 and the signal processing means is provided at the end of the fitting-side cylindrical portion 61 of the core metal 21 of the fixed-side seal member 8 in the axial vehicle body side. It has been.

  The effect of the rolling bearing device using the rotational speed detection device of the above embodiment will be described with reference to FIGS. 4 (a) to 4 (c).

  The connecting portion 70 is bent smoothly, and the cross section perpendicular to the circumferential direction of the magnetizing member fixing core 66 is substantially U-shaped. When the small-diameter cylindrical portion 69 is press-fitted into the sealing metal core, it deforms outward in the radial direction as shown by a two-dot chain line in FIGS. 4 (b) and 4 (c). Since the connecting portion 70 has a large elasticity in the radial direction due to the bending thereof, the connecting portion 70 is deformed by the small-diameter cylindrical portion 69 to increase its own degree of bending and absorb the deformation in the radial direction. Therefore, the magnetized body fixing metal core 66 has a small (thin) radial width as a whole, but the radial outward deformation of the large-diameter cylindrical portion 68 is suppressed by the deformation of the connecting portion 70.

  According to the rolling bearing device using the rotational speed detection device of the above embodiment, the following effects can be obtained.

  (1) In the above-described embodiment, the deformation generated in the small diameter cylindrical portion (first cylindrical portion) 69 press-fitted into the cylindrical portion 31 of the slinger 33 extends to the connecting portion 70. However, since the connecting portion 70 is bent, it has elasticity in the radial direction and absorbs a change in position in the radial direction due to elasticity. Therefore, it is possible to suppress the occurrence of radial displacement in the large-diameter cylindrical portion (second cylindrical portion) 68 to which the magnetized body 67 is fixed. Accordingly, the variation in the radial position of the magnetized body 67 due to the press-fitting is smaller than in the conventional case, and the variation in the air gap B and the crystal gap C is also reduced, so that the accuracy of rotational speed detection is improved. The air gap is a distance between a sensor and a sensor target (a magnetized body in the present embodiment) and does not include the width of a member provided therebetween. The crystal gap is the distance between the detection surface of the sensor and the sensor target. In the case of a small sensor, it means the distance from the center of the sensor to the sensor target.

  (2) Further, if variations in the air gap B and the crystal gap C are reduced, the air gap B and the crystal gap C can be designed to be small. Therefore, a small sensor with low sensitivity can be used as the sensor 11. As a result, the size of the sensor 11 can be reduced. Similarly, an inexpensive sensor with low sensitivity can be used as the sensor 11 and the cost can be reduced.

  In addition, you may change the said embodiment as follows.

  In the above embodiment, the plane section including the central axis of the magnetizing member fixing core metal 66 is substantially U-shaped, but other shapes may be used. In short, the shape of the connecting portion 70 may be a shape having elasticity in the radial direction, and may be, for example, a Σ shape.

  In the above embodiment, the magnetized body fixing cored bar 66 is fixed using the inner ring as a rotating ring, but the outer ring may be a rotating ring. In this case, the magnetized body fixing cored bar 66 is provided on the outer ring.

  (Second Embodiment)

  Next, a second embodiment of a rotational speed detection device and a wheel rolling bearing device using the rotational speed detection device embodying the present invention will be described with reference to FIGS. Since the second embodiment has a configuration in which the shape of the magnetizing member fixing core bar 66 of the first embodiment is changed, detailed description of similar parts is omitted, and FIG. Reference is also made to FIG.

  As typically shown in FIG. 5B, in the present embodiment, the connecting portion 70 of the magnetizing member fixing core metal 66 has an annular shape perpendicular to the central axis. As typically shown in FIGS. 5A and 5C, a plurality of substantially parallelogram-shaped holes are provided at equal intervals along the circumferential direction in the connecting portion 70. When the small-diameter cylindrical portion 69 is press-fitted into the slinger 33, it deforms outward in the radial direction as shown by a two-dot chain line in FIGS. 5 (b) and 5 (c). Since the connection portion 70 is easily deformed in the vicinity of the hole portion, it receives deformation of the small-diameter cylindrical portion 69, deforms in a direction in which the inclination angle of the hypotenuse of the parallelogram increases, and deforms to swell in the vehicle body side direction, Absorbs changes in the radial outward position. Accordingly, the magnetized body fixing core metal 66 has a small (thin) radial width as a whole, but a change in the radially outward position of the large-diameter cylindrical portion 68 is suppressed by the deformation of the connecting portion 70.

  The same effects as those of the first embodiment can be obtained by the rotational speed detection device of the second embodiment and the wheel rolling bearing device using the rotational speed detection device.

  In addition, you may change the said embodiment as follows.

  In the above embodiment, the cross section perpendicular to the circumferential direction of the magnetizing member fixing core metal 66 is substantially U-shaped, but it may be substantially U-shaped as in the first embodiment. In this case, since the elastic deformation due to the substantially U-shape occurs, the size of the substantially parallelogram-shaped hole can be made smaller than that of the U-shaped cross section.

  (Third embodiment)

  Next, a third embodiment of a rotational speed detection device and a wheel rolling bearing device using the rotational speed detection device embodying the present invention will be described with reference to FIGS. Since the third embodiment has a configuration in which the shape of the magnetizing body fixing cored bar 66 of the first and second embodiments is changed, the detailed description of the same parts is omitted. Reference is also made to FIGS.

  As typically shown in FIG. 6B, in the present embodiment, the connecting portion 70 of the magnetizing body fixing core metal 66 has an annular shape perpendicular to the central axis. As typically shown in FIGS. 6A and 6C, the connecting portion 70 is provided with a radial notch extending from the small diameter cylindrical portion 69 to the connecting portion 70 along the circumferential direction. When the small-diameter cylindrical portion 69 is press-fitted into the slinger 33, it deforms outward in the radial direction as shown by a two-dot chain line in FIGS. 6 (b) and 6 (c). Since the small-diameter cylindrical portion 69 and the connecting portion 70 are easily deformed in the vicinity of the notch portion, the small-diameter cylindrical portion 69 is deformed so as to increase in the notch width and to expand in the vehicle body side direction in response to the deformation of the small-diameter cylindrical portion 69. Absorbs the position change of the radially outward direction. Accordingly, the magnetized body fixing core metal 66 has a small (thin) radial width as a whole, but a change in the radially outward position of the large-diameter cylindrical portion 68 is suppressed by the deformation of the connecting portion 70.

  The same effects as those of the first and second embodiments can be obtained by the rotation speed detection device and the rolling bearing device using the rotation speed detection device in the third embodiment.

  In addition, you may change the said embodiment as follows.

  In the above embodiment, the cross section by a plane including the central axis of the magnetized body fixing core metal 66 may be substantially U-shaped as in the first embodiment. In this case, since the elastic deformation due to the substantially U-shape occurs, the size of the notch can be made smaller than that of the substantially U-shaped cross section.

  In addition, the hole or notch provided in at least one of the connecting portion 70 and the small diameter cylindrical portion 69 may have another form regardless of the second and third embodiments. In short, it is only necessary that the radial deformation due to the press-fitting is absorbed by at least one of the connecting portion 70 and the small-diameter cylindrical portion 69 and the radial deformation of the large-diameter cylindrical portion 68 can be suppressed.

  -Furthermore, the structure of the connection part 70 and the small diameter cylindrical part 69 may be any regardless of the first, second, and third embodiments. As described above, it is only necessary that the radial deformation of the small diameter cylindrical portion 69 caused by the press-fitting is absorbed by at least one of the connecting portion 70 and the small diameter cylindrical portion 69 and the radial deformation of the large diameter cylindrical portion 68 can be suppressed. is there.

Sectional drawing by the plane containing the central axis of a wheel of the rolling bearing apparatus concerning 1st Embodiment. The partial enlarged view of the rolling bearing apparatus concerning 1st Embodiment. The figure which looked at the rolling bearing apparatus concerning 1st Embodiment from the vehicle body side. It is explanatory drawing of the core metal for magnetizing body fixation of the rolling bearing apparatus concerning 1st Embodiment, (a) is a perspective view with a part cut away of the core metal for magnetism body fixing. (B) is sectional drawing by the plane containing the central axis of the core metal for magnetizing body fixation. (C) is the partially expanded view which looked at the core for magnetized body fixation from the vehicle body side. It is explanatory drawing of the core metal for magnetizing body fixation of the rolling bearing apparatus concerning 2nd Embodiment, (a) is a partial cutaway perspective view of the core metal for magnetism body fixing. (B) is sectional drawing by the plane containing the central axis of the core metal for magnetizing body fixation. (C) is the partially expanded view which looked at the core for magnetized body fixation from the vehicle body side. It is explanatory drawing of the core metal for magnetizing body fixation of the rolling bearing apparatus concerning 2nd Embodiment, (a) is a partial cutaway perspective view of the core metal for magnetism body fixing. (B) is sectional drawing by the plane containing the central axis of the core metal for magnetizing body fixation. (C) is the partially expanded view which looked at the core for magnetized body fixation from the vehicle body side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hub unit 2 Rotational speed detection apparatus 3 Car body side track member 4 Wheel side track member 5 Ball 6 Cage 7 Cage 7 Sealing device 8 Fixed side seal member 9 Rotation side seal member 10 Pulsar 11 Sensor 12 Outer ring track 13 Flange 14 Hollow shaft 15 Track Groove 16 Raceway groove 17 Inner ring 18 Flange part 20 Seal member 21 Metal core 22 Resin member 26 Overhang part 27 Connector part 28 Connector pin 29 Knuckle 30 Lead wire 31 Cylindrical part 32 Flange part 33 Slinger (seal metal for sealing)
47 notch portion 61 fitting cylindrical portion 62 coupling portion 63 moisture intrusion preventing cylindrical portion 64 flange portion 65 elastic seal member 66 cored rod 67 for fixing magnetized body magnetized body 68 large diameter cylindrical portion (first cylindrical portion)
69 Small diameter cylindrical part (second cylindrical part)
70 connecting part

Claims (6)

A rotational speed detection device for detecting a rotational speed of a rotating member by detecting a magnetic change caused by rotation of the rotating member provided with a magnetized body,
A first cylindrical portion to which the magnetized body is fixed;
A cored bar for sealing press-fitted into the rotating member;
A second cylindrical portion press-fitted into the sealing metal core;
A connecting portion for connecting the first and second cylindrical portions;
A magnetic sensor disposed so as to face the magnetized body,
A rotational speed detecting device in which at least one of the second cylindrical portion and the connecting portion has elasticity.   The rotational speed detection device according to claim 1, wherein the connecting portion is bent.   3. The rotational speed detection device according to claim 1, wherein at least one of the second cylindrical portion and the connection portion has a cutout portion or a hole portion.   The rotation speed detection device according to claim 3, wherein the connection portion includes the hole portion, and the connection portion includes a substantially parallelogram-shaped hole portion.   The rotation speed detection device according to claim 3, wherein the notch portion is provided in the second cylindrical portion and the connecting portion.   The rolling bearing apparatus using the rotational speed detection apparatus of any one of Claims 1-5.

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