JP2004037356A - Pulsar ring for rotation detector and rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To heighten versatility of a ring magnet by enabling use of the same kind of pulsar ring even when the detection position of a sensor is changed to some extent, for example, by the kind thereof, in a support ring of the pulsar ring used for a rotation detector. <P>SOLUTION: This pulsar ring 15 used for the rotation detector 4 for detecting the rotation state of a rotating member 32 has the support ring 17 mounted on the rotating member 32, and the ring magnet 18 mounted on the support ring 17. The support ring 17 has a cylinder part 21 interfitted and mounted on a peripheral face shoulder part of the rotating member 32, and a flange 22 extended to one side in the radial direction along the end face of the rotating member 32 from the external end of the cylinder part 21. The ring magnet 18 is mounted on the outer face of the flange 22, and the ring magnet 18 is extended to the other side in the radial direction along the end face of the rotating member 32 in the stranded state on the peripheral face part of the cylinder part 21. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pulsar ring and rolling bearing device for a rotation detector.
[0002]
[Prior art]
For example, in an automobile and the like, a rotation detector used for controlling an antilock brake system (ABS) or the like may be provided in a rolling bearing device for supporting wheels.
[0003]
The rotation detector has a configuration including a pulsar ring and a sensor. The pulsar ring is attached to a rotating member provided in the rolling bearing device, and a sensor is attached to the stationary member in a state facing the pulsar ring. The rotation speed of the pulsar ring, which rotates synchronously with the rotating member, is detected by a sensor, whereby the rotation state such as the rotation speed and the rotation direction of the wheel is detected.
[0004]
Generally, as the kind of the pulsar ring, a magnetic piece type having a comb-shaped metal ring and a metal ring provided with through holes at several places around the circumference, and a metal support ring are alternately arranged in the circumferential direction. There is a magnet type provided with an annular magnet in which magnetic poles are arranged.
[0005]
As a conventional example, an example of a magnet type pulsar ring will be described with reference to FIGS. In the figure, 81 is the whole rolling bearing device for supporting wheels, 82 is a hub axle, 83 is an outer ring as a stationary member, 84 is an inner ring as a rotating member, 85 is a rolling element, 86 is a protective cap, and 87 is rotation detection. It is a vessel.
[0006]
The rotation detector 87 includes a pulsar ring 88 and a sensor 89 for detecting a magnetic flux. The pulsar ring 88 includes a support ring 90 attached to the inner ring 84 and an annular magnet 91 attached to the support ring 90.
[0007]
The support ring 90 has a cylindrical fitting portion 92 fitted and mounted on the shoulder of the outer peripheral surface of the inner ring 84, a radially inward extending from one end of the fitting portion 92, and an annular magnet 91 on the outer surface. And a flange 93 to which is attached, and an upper half section has a laterally L-shaped shape. The annular magnet 91 is a magnetized rubber ring in which rubber mixed with magnetic powder is formed in an annular plate shape, and N and S poles are alternately magnetized in the circumferential direction.
[0008]
[Problems to be solved by the invention]
Usually, it is necessary to position the sensor 89 such that the center X of the sensor 89 and the detection diameter Y of the annular magnet 91 of the pulsar ring 88 match.
[0009]
That is, in the above conventional example, it is necessary to specify the position of the annular magnet 91 of the pulsar ring 88 according to the position of the sensor 89.
[0010]
In a situation in which the center X of the sensor 89 must be arranged on the outer diameter side with respect to the outer peripheral shoulder of the inner ring 84, the support ring 90 of the pulsar ring 88 has an upper half with a horizontal L-shaped cross section. Therefore, it is impossible to make the detection diameter Y of the annular magnet 91 attached to the flange 93 of the support ring 90 coincide with the center X of the sensor 89.
[0011]
For such a situation, as shown in FIG. 14, after increasing the outer diameter of the shoulder of the outer peripheral surface of the inner ring 84 to which the pulsar ring 88 is attached from R1 to R2, the diameter of the pulsar ring 88 is increased. If the size is increased, the detection diameter Y of the annular magnet 91 can be made to coincide with the center X of the sensor 89. However, such measures are not preferable because the shapes of the inner ring 84 and the pulsar ring 88 need to be changed, which leads to an increase in cost.
[0012]
[Means for Solving the Problems]
The present invention is a pulsar ring used for a rotation detector for detecting a rotation state of a rotating member, comprising a support ring attached to the rotation member, and an annular magnet attached to the support ring. The support ring has a cylindrical portion fitted and mounted to a peripheral shoulder of the rotating member, and a flange extending radially to one side from an outer end of the cylindrical portion, and the annular magnet is The annular magnet is attached to the outer surface of the flange, and the annular magnet extends to the other side in the radial direction.
[0013]
The rotating member is a shaft or a cylinder. The outer end of the cylindrical portion is a portion located on the edge side of the rotating member. The flange may be in a state of being in contact with the end surface of the rotating member or in a non-contact state.
[0014]
In this case, the annular magnet is attached to the outer surface of the flange, and the annular magnet extends to the other side in the radial direction. The annular magnet extension portion is located on the other side in the radial direction opposite to the one side in the radial direction extending from the cylindrical portion. Therefore, in the pulsar ring of the present invention, the detection range of the annular magnet with respect to the sensor in the annular magnet is increased in the radial direction as compared with the related art in which the annular magnet is provided only on the flange of the support ring. Is easily aligned with the detection center of the sensor in the radial direction. Therefore, since the radial width of the annular magnet attached to the flange can be set to be relatively large, even when the sensor arrangement position is slightly different in the radial direction, the detection can be performed sufficiently well, and the versatility is high. It will be. Therefore, there is no need to change the outer diameter of the inner ring to which the pulsar ring is attached or the inner diameter of the outer ring as in the conventional example shown in FIGS.
[0015]
Further, when the annular magnet blows a corner portion formed between the cylindrical portion of the support ring and the flange to form an axially extending portion, the annular magnet moves radially from an end of the outer surface of the flange. Even when the annular magnet is extended to one side, the extended portion of the annular magnet rides on the outer peripheral portion of the cylindrical portion of the support ring, so that the annular magnet is firmly supported. Therefore, the detection position of the annular magnet is less likely to fluctuate in the axial direction, whereby the detection is less likely to be unstable, and there is an advantage that the detection can be performed with high accuracy.
[0016]
Further, the pulsar ring according to the present invention axially regulates the position of the annular magnet, which is configured to form an axially extending portion including a corner portion formed between the cylindrical portion and the flange. It is preferable that a regulating portion is provided on the cylindrical portion. In this case, the restricting portion makes it more difficult for the detection position of the annular magnet to fluctuate in the axial direction, so that more accurate detection can be performed.
[0017]
Further, in the pulsar ring according to the present invention, it is preferable that the annular magnet is attached to the back side of the flange in a state where the annular magnet is turned around from the edge of the flange to the back side of the flange. In this case, the annular magnet is also attached to the back surface of the outer surface of the flange on which the annular magnet is attached, so that the annular magnet is firmly attached to the flange, and problems such as peeling of the annular magnet from the flange are further reduced. Less likely to occur. In addition, if the portion of the annular magnet that wraps around the flange rear surface is in contact with the end surface of the rotating member, the annular magnet is prevented from peeling from the flange by being suppressed by the end surface of the rotating member, The wrapped-in portion acts as a seal against a portion where the support ring is fitted to the rotating member, and also serves as a position regulating member when the support ring is fitted to the rotating member, so that it also acts as a positioning during the fitting. I do.
[0018]
In addition, the rolling bearing device according to the present invention includes a fixed wheel, a rotating wheel, a rolling element rotatably interposed between the two wheels, and a rolling member mounted on a shoulder of a peripheral surface of the rotating wheel. A pulsar ring for detecting a rotation state, wherein the pulsar ring has a support ring attached to the rotating wheel, and an annular magnet attached to the support ring, wherein the support ring is A cylindrical portion fitted and mounted to a peripheral shoulder of the wheel, and a flange extending radially from an outer end of the cylindrical portion along an end surface of the rotating wheel; And the annular magnet extends radially to the other side along the end surface of the rotating wheel.
[0019]
In this case, the annular magnet is attached to the outer surface of the flange, and the annular magnet extends to the other side in the radial direction. Is a portion of the annular magnet extension on the other side in the radial direction opposite to one side in the radial direction extending from the cylindrical portion. Therefore, in the pulsar ring of the rolling bearing device of the present invention, the detection range of the annular magnet with respect to the sensor in the annular magnet is expanded in the radial direction as compared with the related art in which the annular magnet is provided only on the flange of the support ring. Therefore, the detection position of the annular magnet and the detection center of the sensor can be easily matched in the radial direction. Therefore, since the radial width of the annular magnet attached to the flange can be set to be relatively large, even when the sensor arrangement position is slightly different in the radial direction, the detection can be performed sufficiently well, and the versatility is high. It will be. Therefore, there is no need to change the outer diameter of the inner ring or the inner diameter of the outer ring as the rotating wheel to which the pulsar ring is attached as in the conventional example shown in FIGS.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show a first embodiment of the present invention. Here, a rolling bearing device used on a driven wheel side of an automobile will be described as an example. The illustrated rolling bearing device 1 includes a hub shaft 2, a double-row rolling bearing 3, and a rotation detector 4.
[0021]
A flange 2a extending radially outward is provided near one shaft end of the hub shaft 2. A double-row rolling bearing 3 is provided outside the hub shaft 2 in a region closer to the vehicle inner side than the flange 2a. I have.
[0022]
The double-row rolling bearing 3 is a double-row outward-facing angular ball bearing, and has a single outer ring 31 as a fixed ring having two rows of raceway grooves, and a single-row outer bearing 2b fitted on the small-diameter outer peripheral surface 2b of the hub axle 2. A rotating member having a track, that is, a single inner ring 32 as a rotating ring, a plurality of balls 33 as rolling elements arranged in two rows, and two crown retainers 34 and 35 are provided. The large-diameter outer peripheral surface 2c of the hub shaft 2 is configured as one inner ring. A flange 36 extending radially outward is provided on the outer periphery of the outer ring 31. A protective cap 37 for sealing the inside of the bearing is mounted on the vehicle inner side of the outer race 31.
[0023]
The flange 36 of the outer race 31 of the double row rolling bearing 3 is non-rotatably attached to a carrier (or knuckle) 5 which is a part of the vehicle body with a bolt 6, and the outer surface of the flange 2 a of the hub axle 2. A disk rotor 9 and a wheel of a disk brake device are constituted by a nut 8 screwed to a bolt 7 which is mounted at several places on the circumference of the flange 2a (left side in FIG. 1, on the vehicle outer side). 10 is clamped and fixed.
[0024]
The rotation detector 4 detects a rotation state such as a rotation speed and a rotation direction of the hub shaft 2, and includes a pulsar ring 15 and a sensor 16.
[0025]
The pulsar ring 15 has a support ring 17 attached to a shoulder of the outer peripheral surface of the inner ring 32, and an annular magnet 18 attached to the support ring 17. As shown in FIG. 2, the annular magnet 18 has a configuration in which a rubber material mixed with, for example, ferrite magnetic powder is formed in an annular plate shape, and its circumferentially equally spaced regions are alternately magnetized to N poles and S poles. It is a magnetic rubber ring.
[0026]
The sensor 16 has a predetermined air gap with respect to the outer surface of the annular magnet 18 of the pulsar ring 15 in a state where the center X and the detection diameter Y of the annular magnet 18 are matched, as indicated by a dashed line in FIG. It is attached to the protective cap 37 in a state where it faces in the axial direction, and outputs an electric signal corresponding to the rotation state of the annular magnet 18. This protective cap 37 is fitted and fixed to the outer race 31. The sensor 16 includes a magnetic detection element such as a Hall element and a magnetic resistance element serving as a detection unit that changes the output in accordance with the flow direction of magnetic flux, and an IC that incorporates a waveform shaping circuit that adjusts the output waveform of the magnetic detection element. This is a so-called active sensor.
[0027]
When the pulsar ring 15 rotates with the rotation of the inner ring 32 integral with the hub shaft 2, the rotation detector 4 detects a change in the magnetic flux of the pulsar ring 15 with a sensor 16, and the wheel 10 attached to the hub shaft 2 Detect the rotation speed of.
[0028]
Here, since the shape of the annular magnet 18 of the pulsar ring 15 is devised, it will be described in detail below with reference to FIGS.
[0029]
The support ring 17 extends in a radially outward direction and a radially inward direction from a cylindrical tubular portion 21 fitted and mounted to a shoulder portion of an outer peripheral surface of the inner ring 32 and an outer end of the tubular portion 21. And a flange 22 forming a surface along the end surface of the inner ring 32. The annular magnet 18 is attached to the outer surface of the flange 22.
[0030]
The support ring 17 is made of a nonmagnetic metal material (for example, JIS standard SUS304) or a magnetic metal material (for example, JIS standard SPCC), and is formed by bending a single metal plate, for example. That is, the support ring 17 is formed by bending a disc member having a circular hole concentric with an outer peripheral shape circle by 90 degrees at a predetermined radial position, and forming a cylindrical tubular portion 21 and one end of the tubular portion 21. The flange 22 extending from the outer end (in the state fitted to the inner ring 32) to the inner diameter side is press-formed.
[0031]
The annular magnet 18 has an entire outer surface of the flange 22, an outer peripheral surface portion near a bent portion connected to the flange 22 of the cylindrical portion 21, and a portion which extends from the inner peripheral edge of the outer surface of the flange 22 to the back surface of the flange 22. Are adhesively fixed to the portion near the inner diameter side edge. The outer surface of the flange 22, as shown in FIG. 4, the ring magnet 18 are formed mounting in a state in which the axial width t _1. The annular magnet 18 extends radially outward from the flange 22, and the extended portion 18 a is formed so as to ride on the outer peripheral surface near the bent portion connected to the flange 22 of the cylindrical portion 21. I have. Therefore, since there is the ride raised portions, the axial width t ₂ of the extended portion 18a of the radially outer ring magnet 18, Daito than the axial width t ₁ of the portion 18b which is attached to the flange 22 Has become. That is, the extending portion 18a of the annular magnet 18 is provided with an axially extending portion extending to the side away from the flange 22 in the axial direction including the corner portion of the flange 22 and the cylindrical portion 21. The portion is adhesively fixed to the outer peripheral surface of the cylindrical portion 21, and the axial width including the axially extending portion is t ₂ . A portion 18c of the annular magnet 18 that extends from the inner diameter side edge of the flange 22 to the rear surface of the flange 22 acts as a seal for a place where the support ring 17 is fitted to the inner ring 32, and the support ring 17 is connected to the inner ring 32. Since it serves as a position regulating member when fitted to the device, it also functions as positioning during the fitting.
[0032]
Incidentally, or radial length of the extended portion 18a of the annular magnet 18, the axial width t ₂ is arbitrary. Therefore, in the pulsar ring 15, if the radial width of the annular magnet 18 is secured in advance so that the detection range of the annular magnet 18 on the outer surface of the flange 22 can be secured in a predetermined range in the radial direction, the sensor 16 Can be changed within a predetermined range of the center X position.
[0033]
The support ring 17 is manufactured by adjusting the outer shape by press working, and then performing a degreasing process, a chemical conversion process (for example, a phosphate coating process), and a drying process in this order. The ring magnet 18 made of the magnetized rubber ring is attached to the flange 22 of the support ring 17 and the outer peripheral surface near the shoulder of the cylindrical portion 21 by vulcanization bonding. As shown in FIG. 5, the pulsar ring 15 is manufactured by molding the support ring 17 into the annular magnet 18 by insert molding. That is, the support ring 17 is fixedly mounted in a cavity 53 formed by three molds 50, 51, and 52, and a rubber material is injected into the cavity 53 and molded.
[0034]
In such a pulsar ring 15, by setting the radial width of the annular magnet 18 provided in the support ring 17 in advance, the radial position of the annular magnet 18 attached to the flange 22 can be adjusted. Thus, the position of the sensor 16 can be appropriately changed, and the versatility can be increased. Therefore, there is no need to change the outer diameter of the inner ring 32 to which the pulsar ring 15 is attached, unlike the conventional example shown in FIGS.
[0035]
Note that the present invention is not limited to only the first embodiment, and various applications and modifications are conceivable.
[0036]
(1) The double-row rolling bearing 3 shown in the first embodiment may be a double-row rolling bearing of various oblique contact types such as a tapered roller, in addition to a double-row outward-facing angular contact ball bearing.
[0037]
(2) In the first embodiment, the inner ring rolling type rolling bearing device 1 has been described as an example. However, the outer ring rolling type rolling bearing device 1A can be used. In the case of this outer ring rotating type rolling bearing device 1A, as shown in FIG. 6, a pulsar ring 15 is attached to a rotating member, that is, an outer ring 31 serving as a rotating ring, and a sensor is provided for the shaft 11 serving as a fixed ring. 16 is attached. The pulsar ring 15 shown in FIG. 6 has a shape based on basically the same design concept as that shown in FIG. 1 (however, the flange 22 extends radially outward from the cylindrical body 21). At the same time, the extension 18a of the annular magnet 18 extends radially inward). In such a pulsar ring 15, as shown in FIG. 7, the radial width of the annular magnet 18 is secured in advance so that the detection range of the annular magnet 18 on the outer surface of the flange 22 can be secured in a predetermined range in the radial direction. If so, it is possible to cope with a change in the center X position of the sensor 16 within a predetermined range. Accordingly, the annular magnet 18 can be attached to the flange 22 of the annular magnet 18 by adjusting the detection diameter Y of the annular magnet 18 in accordance with a change in the center X position of the sensor 16 within a predetermined range.
[0038]
(3) In the first embodiment, the pulsar ring 15 in which the flange 22 of the support ring 17 in a state of being fitted to the inner race 32 is bent radially inward from the cylindrical portion 21 is shown. As shown in FIG. 8, the flange 22 of the support ring 17 in a state fitted to the inner ring 32 may be bent radially outward from the cylindrical portion 21.
[0039]
In this case, the annular magnet 18 is formed with the extension 18a so as to extend radially inward from the portion 18b attached to the outer surface of the flange 22.
[0040]
(4) In the first embodiment, the support ring 17 of the pulsar ring 15 is provided with only the cylindrical portion 21 and the flange 22. However, as shown in FIG. 9, a second flange as a restricting portion is further provided. 40 may be provided.
[0041]
In this case, the second flange 40 is formed to be bent radially outward on the axial inner end side of the cylindrical portion 21. An axially inner end side of an extended portion 18a extending radially outward from a portion 18b bonded and fixed to the flange 22 of the annular magnet 18 is vulcanized and bonded to the second flange 40. Therefore, the extending portion 18a of the annular magnet 18 does not only extend in a cantilever shape radially outward from the flange 22 as described in the first embodiment, but is not displaced in the axial direction by the second flange 40. Is regulated as follows. By this regulation, the mounting posture of the annular magnet 18 to the support ring 17 can be further stabilized, so that the magnetic flux can be generated from the annular magnet 18 to the sensor 16 with higher accuracy, which contributes to increase the detection accuracy. it can.
[0042]
As a modification of such a configuration, as shown in FIG. 10, the outer ring 31 may be used as a rotating member, and the pulsar ring 15 may be provided on the inner peripheral surface shoulder of the outer ring 31.
[0043]
As shown in FIG. 11, a pressing portion is formed at a predetermined intermediate position in the axial direction of the cylindrical portion 21 of the support ring 17 as a restricting portion for restricting the extending portion 18 a of the annular magnet 18 of the pulsar ring 15 in the axial direction. For example, the protrusion 41 may be provided over the entire circumference in the circumferential direction. In this case, the extending portion 18a of the annular magnet 18 is vulcanized and adhered while being joined to the ridge 41.
[0044]
(5) In the first embodiment, the extension portion 18a of the annular magnet 18 of the pulsar ring 15 has a constant axial width. However, as shown in FIG. The axial width of the portion 18a may be set large near the outer peripheral surface of the cylindrical portion 21 of the support ring 17, and may be set smaller at the radially distal end side of the extending portion 18a. That is, a protruding portion 18d which is widened in the axial direction is provided at a portion of the extension portion 18a which rides on and adheres to the outer peripheral surface of the cylindrical portion 21. The protruding portion 18d reinforces the extension portion 18a so as not to be easily deformed in the axial direction.
[0045]
(6) In the first embodiment described above, the annular magnet is provided with a portion that extends from the radial edge of the flange of the support ring to the rear surface side of the outer surface of the flange. A configuration may be used.
[0046]
【The invention's effect】
In the present invention, it is possible to manufacture the detection diameter of the annular magnet of the pulsar ring to be larger than the radial width of the flange of the support ring in consideration of the fact that the arrangement position of the sensor in the radial direction is various, Thereby, even when the sensor positions are slightly different, the pulsar ring can be used in common, so that the versatility can be increased. Therefore, the coaxiality between the sensor and the annular magnet and the air gap between them can be managed with high accuracy, which contributes to improvement in reliability and detection accuracy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rolling bearing device according to Embodiment 1 of the present invention. FIG. 2 is a partially cutaway perspective view of the pulsar ring of FIG. 1. FIG. FIG. 4 is an enlarged cross-sectional view of one half of the pulsar ring of FIG. 1. FIG. 5 is a cross-sectional view of one half of the pulsar ring showing insert molding of the pulsar ring of FIG. FIG. 6 is a cross-sectional view of a rolling bearing device according to a second embodiment of the present invention. FIG. 7 is an enlarged view showing an example in which the detected diameter of the pulsar ring in FIG. 6 is changed. FIG. 8 is a rolling bearing of the present invention. FIG. 9 is an enlarged sectional view showing a modified example of the pulsar ring provided in the device. FIG. 9 is an enlarged sectional view showing a modified example of the pulsar ring provided in the rolling bearing device of the present invention. FIG. 10 is a rolling bearing of the present invention. A modified example of the pulsar ring provided on the device is shown enlarged. FIG. 11 is a cross-sectional view showing a modified example of the pulsar ring of the present invention in an enlarged manner. FIG. 12 is a cross-sectional view showing a modified example of the pulsar ring of the present invention in an enlarged manner. FIG. 13 is a rolling bearing according to a conventional example. FIG. 14 is an enlarged view showing an example of changing the detection diameter of the pulsar ring in FIG. 13 [Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Rolling bearing device 2 Hub shaft 3 Double row rolling bearing 32 Inner ring (rotating member, rotating wheel)
Reference Signs List 4 rotation detector 15 pulser ring 16 sensor 17 support ring 18 annular magnet 21 cylindrical part of support ring 22 flange of support ring 31 outer ring (fixed ring)
33 Ball (rolling element) X Center of sensor Y Detection diameter of annular magnet

Claims (4)

A pulsar ring used for a rotation detector that detects a rotation state of a rotating member,
A support ring attached to the rotating member, and an annular magnet attached to the support ring,
The support ring has a tubular portion fitted and mounted to a peripheral shoulder of the rotating member, and a flange extending radially to one side from an outer end of the tubular portion,
A pulsar ring for a rotation detector, wherein the annular magnet is attached to an outer surface of the flange, and the annular magnet extends to the other side in the radial direction. The pulser ring for a rotation detector according to claim 1,
A regulating portion for regulating the position in the axial direction of the annular magnet adapted to form an axially extending portion including a corner portion formed between the cylindrical portion and the flange is provided on the cylindrical portion. Pulsar ring for rotation detector. The pulser ring for a rotation detector according to claim 1 or 2,
A pulsar ring for a rotation detector, wherein the annular magnet is attached to the back surface of the flange in a state of being wound around the flange from the edge to the back surface of the flange. A fixed wheel, a rotating wheel, and a rolling element rotatably interposed between the two wheels, and a pulsar ring attached to a peripheral shoulder of the rotating wheel to detect a rotating state of the rotating wheel,
The pulsar ring has a support ring attached to the rotating wheel, and an annular magnet attached to the support ring,
The support ring has a tubular portion fitted and mounted to a peripheral shoulder of the rotating wheel, and a flange extending radially from an outer end of the tubular portion along an end surface of the rotating wheel. ,
A rolling bearing device, wherein the annular magnet is attached to an outer surface of the flange, and the annular magnet extends radially to the other side along an end surface of the rotating wheel.

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