JP4032851B2 - Rolling bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling rising bearing device.
[0002]
[Prior art]
For example, in a car or the like, a rotation detector used for controlling an anti-lock brake system (ABS) or the like may be provided on a rolling bearing device for supporting a wheel.
[0003]
The rotation detector is configured to include a pulsar ring and a sensor. This pulsar ring is attached to the rotating member provided in the rolling bearing device, the sensor is attached to the stationary member in a state of facing the pulsar ring, and the rotational speed of the pulsar ring that rotates synchronously with the rotating member is used as the sensor. And detecting the rotational state such as the rotational speed and direction of the wheel.
[0004]
In general, for the pulsar ring, a magnetic piece type that is a comb-shaped metal ring and a metal ring having through holes at several places around the circumference, or magnetic poles alternately in the circumferential direction with respect to a metal support ring. There is a magnet type to which an annular magnet formed is attached.
[0005]
As a conventional example, an example of a magnet type pulsar ring will be described with reference to FIG. In the figure, 81 is the entire rolling bearing device for supporting wheels, 82 is a hub shaft, 83 is an outer ring, 84 is an inner ring, 85 is a rolling element, 86 is a protective cap, and 87 is a rotation detector.
[0006]
The rotation detector 87 includes a pulsar ring 88 and a sensor 89. The pulsar ring 88 includes a support ring 90 attached to the inner ring 84 serving as a rotating member, and an annular magnet 91 attached to the support ring 90.
[0007]
The support ring 90 has a cylindrical fitting portion 92 fitted and attached to the outer peripheral surface shoulder of the inner ring 84, and extends radially inward from one end of the fitting portion 92 and has an annular magnet 91 on the outer surface. Is attached to the flange 93, and the upper half of the cross-section has a lateral L-shape. The annular magnet 91 is a magnetized rubber ring in which rubber mixed with magnetic powder is formed into an annular plate shape, and its N and S poles are magnetized alternately in the circumferential direction.
[0008]
Usually, it is necessary to position the sensor 89 so that the center X of the sensor 89 and the detection diameter Y of the annular magnet 91 of the pulsar ring 88 coincide with each other.
[0009]
[Problems to be solved by the invention]
In the above conventional example, it is necessary to specify the arrangement position of the annular magnet 91 of the pulsar ring 88 according to the arrangement position of the sensor 89.
[0010]
Assuming that the center X of the sensor 89 has to be disposed on the outer diameter side of the outer peripheral surface shoulder of the inner ring 84, the support ring 90 of the pulsar ring 88 has an L-shaped cross section in the upper half. Therefore, it is impossible to make the detected 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. 9, the outer diameter of the outer peripheral surface shoulder of the inner ring 84 to which the pulsar ring 88 is attached is increased from R1 to R2, and then the diameter of the pulsar ring 88 is increased. If it is increased, the detection diameter Y of the annular magnet 91 can be matched with the center X of the sensor 89. However, such a countermeasure is not preferable because the shape of the inner ring 84 needs to be changed, leading to an increase in cost.
[0012]
In contrast, Japanese Patent Laid-Open No. 2001-234928 has been proposed. In this publication, as shown in FIG. 10, the support ring 90 of the pulsar ring 88 is manufactured by pressing from a single metal plate. The support ring 90 is a cylindrical portion 92A fitted to the shoulder of the outer peripheral surface of the inner ring 84, and is bent 90 degrees radially inward from one end of the cylindrical portion 92A and then folded 180 degrees radially outward again. It has a shape having a flange 93A. In the support ring 90, the detection diameter Y of the annular magnet 91 can be changed by changing the bending position of the flange 93A.
[0013]
In such a support ring 90, since the flange 93A is folded, the radially outward plate portion 94A of the flange 93A springs back after folding and the radially inward plate portion of the flange 93A. The phenomenon of leaving from 95A is likely to occur. That is, since the posture of the radially outward plate portion 94A in the flange 93A is likely to be inclined, the air gap between the annular magnet 91 and the sensor 89 attached thereto may go out of order and the detection accuracy may be reduced. There is room for improvement here.
[0014]
[Means for Solving the Problems]
The present invention is attached to a stationary member, a rotating member, a rolling element rotatably interposed between opposing circumferential surfaces of the stationary member and the rotating member, and a circumferential shoulder of the rotating member. Proposed is a rolling bearing device provided with a pulsar ring used to detect the rotational state of the rotating member. The pulsar ring has a support ring attached to the rotating member, and an annular magnet attached to the support ring by arranging magnetic poles alternately in the circumferential direction. Said support ring includes a fitting portion to be fitted and attached to the circumferential surface shoulder portion of the rotary member, is along been extended from the outer end of the fitting portion can radially inward to the end face of said rotary member And a flange to which the annular magnet is attached on the outer surface. The fitting portion is a concentrically spaced large tube portion and a small tube portion that are connected to each other at the inner end thereof, and the upper half of the cross section is formed into a U-shaped sideways. together with the flange is connected to an end portion of the connecting portion and opposite extending portion for supporting the large-cylinder unit to extend radially outward on the free end side of the small tube portion.
And the sensor mounted on the protective cap which is fitted and fixed to the inner peripheral surface of the stationary member are opposed in the axial direction on the ring magnet so as to seal the bearing device.
[0015]
In addition, the said rotation member is a shaft body, a cylinder, etc. The outer end of the fitting part is a part located on the edge side of the rotating member, and the inner end of the fitting part is a part located on the side away from the edge of the rotating member. is there. The flange may be in contact with the end face of the rotating member or in a non-contact state.
[0016]
In this case, the position in the radial direction of the flange can be arbitrarily changed by appropriately adjusting the facing distance between the large cylindrical portion and the small cylindrical portion in the fitting portion of the support ring and the radial length of the flange. . That is, the position of the annular magnet attached to the flange in the radial direction can be appropriately changed according to the arrangement position of the sensor. Therefore, unlike the conventional example shown in FIG. 8, 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.
[0019]
Further , since the posture of the flange is stable, the air gap between the pulsar ring annular magnet and the sensor can be set appropriately, and the rotational state of the rotating member can be accurately grasped.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show a reference example 1 of the present invention. Here, a rolling bearing device used on the driven wheel side of an automobile is taken 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 end of the hub shaft 2, and a double-row rolling bearing 3 is externally mounted on the hub shaft 2 in a region closer to the vehicle inner side than the flange 2a. Yes.
[0022]
The double-row rolling bearing 3 is a double-row outward-facing angular contact ball bearing, and has a single outer ring 31 having two rows of raceway grooves and a single row of raceways fitted on the small-diameter outer peripheral surface 2 b of the hub shaft 2. One inner ring 32, a plurality of balls 33 arranged in two rows, and two crown-shaped cages 34, 35 are provided, and the large-diameter outer peripheral surface 2c of the hub shaft 2 is one inner ring. It has become. A flange 36 extending outward in the radial direction is provided on the outer periphery of the outer ring 31. A protective cap 37 for sealing the inside of the bearing is attached to the vehicle inner side of the outer ring 31.
[0023]
Then, the flange 36 of the outer ring 31 of the double row rolling bearing 3 is attached to the carrier (or knuckle) 5 which is a part of the vehicle body by a bolt 6 so as not to rotate, and the outer surface of the flange 2a of the hub shaft 2 The disk rotor 9 and the wheel of the disk brake device are composed of (the left side of FIG. 1, the surface on the outer side of the vehicle) and the nut 8 screwed to the bolts 7 that are through-fitted at several places on the circumference of the flange 2a. 10 is clamped and fixed. Thus, the outer ring 31 is a non-rotating stationary member, and the inner ring 32 and the hub shaft 2 are rotating members.
[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 that is attached to the shoulder portion of the outer peripheral surface of the inner ring 32, and an annular magnet 18 that is attached to the support ring 17. As shown in FIG. 2, the annular magnet 18 has a structure in which, for example, a rubber material mixed with magnetic powder of ferrite is formed into an annular plate shape, and its circumferentially equidistant regions are alternately magnetized to N and S poles. It is a magnetic rubber ring.
[0026]
The sensor 16 is attached to the protective cap 37 in a state where the center X and the detection diameter Y of the annular magnet 18 coincide with each other and the annular magnet 18 of the pulsar ring 15 is opposed axially through a predetermined air gap. The electric signal corresponding to the rotation state of the annular magnet 18 is output. This sensor 16 is an IC or the like incorporating a magnetic detection element such as a Hall element or a magnetoresistive element that serves as a detection unit that changes the output according to the flow direction of magnetic flux, and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element. This is what is called an 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 by the sensor 16, and the wheel 10 attached to the hub shaft 2. Detects the rotation speed.
[0028]
Here, since the shape of the support ring 17 of the pulsar ring 15 is devised, it will be described in detail below.
[0029]
The support ring 17 is fitted to a shoulder portion of the outer peripheral surface of the inner ring 32, and extends radially inward from the outer end of the fitting portion 21 to the end surface of the inner ring 32. And a flange 22 to which the annular magnet 18 is attached on the outer surface. The support ring 17 is made of a non-magnetic metal material (for example, JIS standard SUS304) or a magnetic metal material (for example, JIS standard SPCC), and is bent by, for example, pressing a single metal plate.
[0030]
The fitting portion 21 is formed by connecting a large tube portion 23 and a small tube portion 24 that are concentrically arranged at one end side thereof, and an upper half of the cross section is formed in a U-shaped sideways. In addition, the said connection part is attached | subjected the code | symbol 25. FIG.
[0031]
The flange 22 is connected to an end portion (outer end) opposite to the connecting portion 25 in the large tube portion 23 of the fitting portion 21. In the figure, the annular magnet 18 is attached to almost the entire region excluding the bent portion of the flange 22, but the radial length of the annular magnet 18 is arbitrary.
[0032]
In addition, as a manufacturing procedure of the said support ring 17, after adjusting an external shape by press work, it manufactures by performing a degreasing process, a chemical conversion process (for example, phosphate coating process), and a drying process in this description order, The annular magnet 18 made of the magnetized rubber ring is attached to the flange 22 of the support ring 17 after the drying treatment by vulcanization adhesion.
[0033]
In such a pulsar ring 15, by appropriately adjusting the facing distance between the large tube portion 23 and the small tube portion 24 in the fitting portion 21 of the support ring 17 and the radial length of the flange 22 in the radial direction of the flange 22. The position of can be changed arbitrarily. In other words, the position of the annular magnet 18 attached to the flange 22 in the radial direction can be changed as appropriate according to the arrangement position of the sensor 16, so that it can be highly versatile. Therefore, it is not necessary to change the outer diameter of the inner ring 32 to which the pulsar ring 15 is attached as in the conventional example shown in FIG.
[0034]
For example, as shown in FIG. 3, when it is necessary to dispose the sensor 16 on the outer diameter side from the position indicated by the solid line to the position indicated by the two-dot chain line, the fitting portion 21 of the support ring 15 for the pulsar ring 15. The center X of the sensor 16 and the detection diameter Y of the annular magnet 18 can be made to coincide with each other by using the one in which the facing distance between the large cylinder part 23 and the small cylinder part 24 is set large.
[0035]
Further, when the support ring 17 is manufactured by press working, the connecting portion 25 between the large tube portion 23 and the small tube portion 24 and the connecting portion between the large tube portion 23 and the flange 22 are only bent. The number of steps is the same as that of the conventional example shown in FIG. Moreover, since the bending angle of the connecting portion between the large tube portion 23 and the flange 22 is approximately 90 degrees, which is smaller than that of the conventional example shown in FIG. 10, the bending of the flange 22 is easy, and the flange 22 is bent after bending. It becomes difficult to spring back and the posture is stable without tilting. Therefore, the coaxiality between the center X of the sensor 16 and the detection diameter Y of the annular magnet 18 and the air gap between the sensor 16 and the annular magnet 18 can be managed with high accuracy, for example, to improve reliability and detection accuracy. Can contribute.
[0037]
The double row rolling bearing 3 shown in the reference example 1 may be various oblique contact type double row rolling bearings such as tapered rollers in addition to the double row outward angular ball bearing.
[0038]
FIG. 4 shows Reference Example 2 of the present invention. In the reference example 2 , in the support ring 17, the free end of the small tube portion 24 is separated from the flange 22 by a predetermined amount. If a chemical conversion treatment (phosphate coating treatment) is performed on the support ring 17 when the pulsar ring 15 is manufactured, the large cylindrical portion 23, the small cylindrical portion 24, the connecting portion 25, and the flange in the support ring 17 in the chemical conversion treatment process. Therefore, it is possible to reliably prevent the chemical conversion treatment agent from remaining in the annular space surrounded by 22.
[0039]
FIG. 5 shows an embodiment of the present invention. In this embodiment , an extending portion 26 that extends radially outward is provided on the free end side of the small tube portion 24. In this case, since the large cylinder part 23 can be supported by the extending part 26, the opposing distance between the large cylinder part 23 and the small cylinder part 24 can be kept substantially constant even when an external force acts on the large cylinder part 23. It is possible to prevent the detection diameter Y after construction from deviating from the designed detection diameter and the detection diameter Y from deviating over time.
[0040]
In each of the above examples , the inner ring rotation type rolling bearing device 1 is taken as an example. However, for example, an outer ring rotation type rolling bearing device 1A as shown in FIG. 6 can be used. In the case of this outer ring type rolling bearing device 1A, the pulsar ring 15 is attached to the outer ring 22 serving as a rotating member, and the sensor 16 is attached to the shaft body 11 that does not rotate. The pulsar ring 15 shown in FIG. 6 is basically shaped based on the same design concept as that shown in FIG. 1, but the same design as the reference example 2 shown in FIG. 4 and the embodiment shown in FIG. It can be an idea. In such a pulsar ring 15, by appropriately adjusting the facing distance between the large tube portion 23 and the small tube portion 24 in the fitting portion 21 of the support ring 17 and the radial length of the flange 22 in the radial direction of the flange 22. The position of can be changed arbitrarily. For example, as shown in FIG. 7, when it is necessary to arrange the sensor 16 on the inner diameter side as indicated by a two-dot chain line, the large tube portion 23 and the small tube portion in the fitting portion 21 of the support ring 17 for the pulsar ring 15. The center X of the sensor 16 and the detection diameter Y of the annular magnet 18 can be made to coincide with each other by using the one having a large opposing distance from the center 24.
[0041]
【The invention's effect】
In the present invention, considering the various arrangement positions in the radial direction of the sensor, it can be manufactured by easily changing the detection diameter of the annular magnet of the pulsar ring, making it highly versatile. Moreover, the support ring can be manufactured stably so that the posture of the flange of the support ring does not tilt. Therefore, the coaxiality between the sensor and the annular magnet and the air gap between them can be managed with high accuracy, which can contribute to the improvement of reliability and detection accuracy.
[Brief description of the drawings]
1 is a cross-sectional view of a rolling bearing device according to Reference Example 1 of the present invention. FIG. 2 is a perspective view of the pulsar ring in FIG. 1. FIG. 3 is an enlarged view of an example in which the detection diameter of the pulsar ring in FIG. rolling according to FIG. 4 reference example 3 of the present cross-sectional view of a rolling bearing device according to an embodiment of the reference sectional view of a rolling bearing apparatus according to example 2 [5] the present invention 6 the invention shown FIG. 7 is an enlarged view showing an example of changing the detected diameter of the pulsar ring in FIG. 6. FIG. 8 is a sectional view of the rolling bearing device according to Conventional Example 1. FIG. Fig. 10 is an enlarged view showing an example of changing the detection diameter of the ring. Fig. 10 is a cross-sectional view showing an enlarged pulsar ring according to Conventional Example 2.
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Hub shaft 3 Double row rolling bearing 32 Inner ring 4 Rotation detector 15 Pulsar ring 16 Sensor 17 Support ring 18 Annular magnet 21 Support ring fitting part 22 Support ring flange 23 Fitting large cylinder part 24 Fitting Small cylinder part of joint X Center of sensor Y Detection diameter of annular magnet

Claims (2)

A stationary member, a rotating member, a rolling element that is rotatably interposed between opposing circumferential surfaces of the stationary member and the rotating member, and a rotating member that is attached to a circumferential shoulder of the rotating member. With a pulsar ring used to detect the rotation state,
The pulsar ring has a support ring attached to the rotating member and an annular magnet attached to the support ring by arranging magnetic poles alternately in the circumferential direction,
Said support ring includes a fitting portion to be fitted and attached to the circumferential surface shoulder portion of the rotary member, is along been extended from the outer end of the fitting portion can radially inward to the end face of said rotary member And a flange to which the annular magnet is attached to the outer surface,
The fitting portion is a concentrically spaced large tube portion and a small tube portion that are connected to each other at the inner end thereof, and the upper half of the cross section is formed into a U-shaped sideways. together with the flange is connected to an end portion of the connecting portion and opposite extending portion for supporting the large-cylinder unit to extend radially outward on the free end side of the small tube portion is provided, the rolling Bearing device. And the sensor mounted on the protective cap which is fitted and fixed to the inner peripheral surface of the stationary member are opposed in the axial direction on the ring magnet so as to seal the bearing device, the rolling bearing apparatus according to claim 1.

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