JP4151269B2 - Rolling bearing device with rotation detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing device provided with a rotation detector that detects the rotational speed of a wheel for the control of an antilock brake system (ABS) or the like.
[0002]
[Prior art]
Conventionally, various rolling bearing devices for vehicles equipped with a rotation detector for ABS control have been proposed.
[0003]
For example, in a vehicle hub unit in which a rolling bearing device with a rotation detector is installed, a rolling element is interposed between an inner ring attached to a hub wheel with a fixed wheel and an outer ring fixed to a vehicle body. A wheel is rotatably supported with respect to the vehicle body via a bearing.
[0004]
The rotation detector fixes the pulsar ring to the inner ring, and is provided with a sensor in the housing or the like so as to face the pulsar ring, and detects the rotation speed of the pulsar ring that rotates with the rotation of the hub wheel. Detect speed.
[0005]
[Problems to be solved by the invention]
The pulsar ring is composed of an annular rubber magnet or the like that is alternately magnetized to the N and S poles, and is fixed to a support ring that is press-fitted and fixed to the inner ring.
[0006]
The support ring includes, for example, a press-fit portion that is pressed by a pressing jig and press-fitted into the inner ring, and a plate-like portion that fixes the pulsar ring.
[0007]
When pressing the support ring with a pressing jig and press-fitting it into the inner ring, the press-fitting portion may be inclined in the radial direction, and the plate-like portion to which the pulsar ring is fixed may be inclined due to the stress. As a result, there is a problem that the pulsar ring is inclined, the facing distance between the pulsar ring and the sensor is changed, and the detection accuracy of the rotational speed by the sensor is lowered.
[0008]
The present invention provides a rolling bearing device with a rotation detector that can keep a predetermined distance between a detection unit and a detection unit of a sensor at a predetermined size and prevent a decrease in detection accuracy of a rotation speed. Objective.
[0013]
[Means for Solving the Problems]
The present invention includes a fixed ring, times track rollers and, the rolling elements disposed rollably between the stationary ring and the rotary ring, the comb teeth are fixed to the rotating ring concentrically on an end edge of the rotating wheel A rolling bearing device with a rotation detector, comprising: a rotor having a sensor; and a sensor having a detection unit facing the comb teeth and changing an output signal in response to a change in the characteristics of the comb teeth, The rotor is made of a magnetic material, and the fixed pieces press-fitted into the fixed wheel facing surface of the rotating wheel and the edge of the fixed piece are alternately bent radially inward and outward and contacted with the end surface of the rotating wheel. It consists of a contact piece and a rising piece rising to the fixed wheel side, and the rising piece or the contact piece becomes the comb teeth.
[0014]
According to the rolling bearing device with a rotation detector according to the present invention , the rotation of the rotor fixed to the rotating wheel is detected by the sensor, and the rotation speed of the rotating wheel is detected. Since the rotor has a shape formed by alternately bending the edge of the fixed piece inward and outward in the radial direction to form a contact piece and a rising piece, the fixed piece is pressed into the edge of the rotating wheel to When fixing, by pressing the fixed piece or the abutting piece portion, the pressing force does not act directly on the rising piece, and the inclination can be prevented. Further, the contact piece can be prevented from tilting by contacting the end face of the rotating wheel. Furthermore, even if the fixed piece is inclined in the radial direction by press-fitting, the rising piece and the contact piece are alternately bent inward and outward in the radial direction, so that the stress of the fixed piece is applied to the rising piece and the contact piece. It is difficult to transmit, and the rising piece and the contact piece can be prevented from being inclined. Thereby, the opposing space | interval of the comb-tooth which consists of a standing piece or a contact piece, and the detection part of a sensor can be kept appropriate, and it can prevent that the detection accuracy of a rotational speed falls.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a reference example will be described with reference to FIGS. Embodiments according to the present invention will be described with reference to FIGS.
[0016]
FIG. 1 is a cross-sectional view of a vehicle hub unit to which a rolling bearing device with a rotation detector according to this embodiment is applied, FIG. 2 is a perspective view of a support ring 3, and FIG. FIG. 4 shows a front view of the pulsar ring 4.
[0017]
In the following description, the vehicle inner side refers to the right side in FIGS. 1, 3, and 5, and the vehicle outer side refers to the left side in FIG.
[0018]
In FIG. 1, 1 is a hub wheel, which has a shaft portion 11 and a hub flange 12 for fixing the wheel.
[0019]
A rolling bearing 2 composed of a double row angular ball bearing is mounted on the outer periphery of the shaft portion 11 of the hub wheel 1. The rolling bearing 2 includes an inner ring 21 that is a rotating wheel that is press-fitted and fixed to the outer periphery of the vehicle inner side of the shaft portion 11, an outer ring 22 that is a fixed ring, and inner ring raceways 13 and 14 formed on the bearing 2 and the inner ring 21. The outer ring 22 is formed of two rows of ball groups 23 which are rolling elements arranged so as to roll along the outer ring raceways 25 and 26. The outer ring 22 is formed with a flange 24 for fixing a knuckle connected to the vehicle body. Has been.
[0020]
A non-magnetic support ring 3 serving as an encoder is provided at an end of the inner ring 21 on the vehicle inner side.
[0021]
As shown in FIG. 2, the support ring 3 is formed by alternately bending a fixed piece 31 extending in the axial direction along the outer ring facing surface 21 a of the inner ring 21 and an edge on the vehicle inner side of the fixed piece 31 radially inward and outward. The contact piece 32 is bent inward in the radial direction, and the rising piece 33 is bent outward in the radial direction. That is, the support ring 3 is formed by making a plurality of cuts in the circumferential direction on one side of the cylindrical body, and alternately bending inward and outward in the radial direction.
[0022]
Further, as shown in FIG. 3, the support ring 3 presses the fixing piece 31 into the outer ring facing surface 21 a of the inner ring 21 from the vehicle inner side and fixes the fixing piece 31 to the inner ring 21. At the time of press-fitting, as shown in FIG. 3A, the fixed piece 31 or the abutting piece 32 is pressed in the direction of arrow P by a press-fitting jig (not shown) so that the rising piece 33 does not tilt. . By press-fitting the support ring 3, the contact piece 32 contacts the end surface 21 b of the inner ring 21 on the vehicle inner side, as shown in FIG.
[0023]
Further, the pulsar ring 4 serving as the detected portion is fixed to the vehicle inner side surface of the rising piece 33 of the support ring 3. The pulsar ring 4 is formed in a ring shape and is made of a permanent magnet such as a rubber magnet mixed with ferrite powder. The pulsar ring 4 is formed by alternately magnetizing N poles 41 and S poles 42 at equal intervals in the circumferential direction.
[0024]
Further, the sensor 5 is provided inside the cover 7 fitted to the outer ring 22. The sensor 5 is opposed to the pulsar ring 4 and has a magnetic detection element that serves as a detection unit that changes the output according to the flow direction of magnetic flux, such as a Hall element or a magnetoresistive element, and a waveform shaping circuit that adjusts the output waveform of the magnetic detection element This is an active sensor composed of an IC or the like that incorporates. The sensor 5 is held on the inner surface of the cover 7 while being embedded in the synthetic resin 6.
[0025]
When the pulsar ring 4 fixed to the inner ring 21 rotates along with the rotation of the shaft portion 11, the sensor 5 detects the change in the magnetic flux of the pulsar ring 4 and detects the rotational speed of the wheel.
[0026]
5 and 6 show a modification of this embodiment.
[0027]
That is, in this modification, the pulsar ring 4 is fixed to the vehicle inner side surface of the contact piece 32 of the support ring 3. The sensor 5 is provided at a position facing the pulsar ring 4.
[0028]
Thus, the pulsar ring 4 can be provided at an arbitrary position on the vehicle inner side surface of the rising piece 33 from the contact piece 32 of the support ring 3 corresponding to the mounting position of the sensor 5. For example, the pulsar ring 4 may be provided over both the contact piece 32 and the rising piece 33.
[0029]
According to the rolling bearing device with the rotation detector configured as described above, the support ring 3 alternately forms the contact pieces 32 and the rising pieces 33 by bending the end edges of the fixed pieces 31 radially inward and outward. Therefore, when the fixing ring 31 is press-fitted into the edge of the inner ring 21 and the support ring 3 is fixed, the fixing piece 31 and the abutting piece 32 are pressed to directly touch the rising piece 33. Inclination can be prevented without pressing force acting. Moreover, since the contact piece 32 contacts the end surface 21b of the inner ring 21, it can prevent the inclination. Further, even if the fixed piece 31 is inclined in the radial direction by press-fitting, the rising pieces 33 and the contact pieces 32 are alternately bent inward and outward in the radial direction. In addition, it is difficult to be transmitted to the contact piece 32, and the rising piece 33 and the contact piece 32 can be prevented from being inclined. Thereby, the opposing space | interval of the pulsar ring 4 provided in the arbitrary positions in the vehicle inner side surface of the contact piece 32 from the standing piece 33 and the detection part of the sensor 5 can be maintained appropriately, and the detection accuracy of rotational speed is high. It can be prevented from lowering.
[0030]
Further, the pulsar ring 4 can be provided at an arbitrary position on the vehicle inner side surface of the abutment piece 32 from the rising piece 33 so as to face the sensor 5, and the degree of freedom of the attachment position of the pulsar ring 4 is expanded.
[0031]
Furthermore, the support ring 3 can be easily formed by making a plurality of cuts arranged in the circumferential direction on one side of the cylindrical body, and alternately bending inward and outward in the radial direction.
[0032]
For the shape condition of the present invention will be described with reference to FIGS.
[0033]
In the following description, the vehicle inner side refers to the right side in FIG. 7, and the vehicle outer side refers to the left side in FIG.
[0034]
FIG. 7 is a sectional view of a vehicle hub unit to which the rolling bearing device with a rotation detector according to this embodiment is applied, and FIG. 8 is a perspective view of the rotor 8. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0035]
The rotor 8 is made of a magnetic material. As shown in FIG. 8, the fixed pieces 81 extending in the axial direction on the outer ring facing surface 21 a of the inner ring 21 and the vehicle inner side end edges of the fixed pieces 81 alternately in the radial direction. The contact piece 82 is bent and bent inward in the radial direction, and the rising piece 83 is bent outward in the radial direction. In this way, the rising piece 83 becomes a comb tooth which is a detected portion.
[0036]
The sensor 9 includes a permanent magnet 92, a magnetic material stator 91 such as a steel plate, and a coil 93. The sensor 9 is embedded in the synthetic resin 10 and fixed to the cover 7. The stator 91 is formed with openings 94 having the same pitch as the notches 84 between the rising pieces 83.
[0037]
The operation of the passive sensor configured as described above will be described.
[0038]
When the rotor 8 rotates together with the inner ring 21, the magnetic flux density in the stator 91 facing the rotor 8 changes, and the voltage generated in the coil 93 changes at a frequency proportional to the rotational speed of the inner ring 21.
[0039]
That is, when the notch 84 and the opening 94 face each other, the rising piece 83 and the column part 95 between the openings 94 face each other through a minute gap, and a high-density magnetic flux flows between the rotor 8 and the stator 91. .
[0040]
When the phase of the notch 84 and the opening 94 is shifted by half, the column part 95 faces the notch 84 and the rising piece 83 faces the opening 94, respectively, and a relatively large gap is formed between the rotor 8 and the stator 91. Occurs and the magnetic flux density is lowered.
[0041]
As a result, the voltage generated in the coil 93 changes in proportion to the rotational speed of the inner ring 21, and the rotational speed of the wheel is detected.
[0042]
In addition, the contact piece 82 may be a comb tooth that is a detected portion, and the sensor 9 may be disposed to face the contact piece 82. Also in this case, since the distance of the gap with the sensor 9 varies depending on whether the contact piece 82 is present or not, the same as the configuration in which the rising piece 83 is a comb-teeth as the detected portion. Thus, the magnetic flux density changes and the rotational speed of the wheel can be detected.
[0043]
According to the rolling bearing device with the rotation detector configured as described above, the rotor 8 is formed by alternately bending the end edges of the fixed pieces 81 radially inward and outward to form the contact pieces 82 and the rising pieces 83. Therefore, when the fixing piece 81 is press-fitted into the edge of the inner ring 21 and the rotor 8 is fixed, the fixing piece 81 or the abutting piece 82 is pressed to directly press the pressing piece 83 against the rising piece 83. Inclination can be prevented without acting. Moreover, since the contact piece 82 contacts the end surface 21b of the inner ring 21, it can prevent the inclination. Furthermore, even if the fixed piece 81 is inclined in the radial direction by press-fitting, the rising pieces 83 and the contact pieces 82 are alternately bent inward and outward in the radial direction. In addition, it is difficult to be transmitted to the contact piece 82, and the rising piece 83 and the contact piece 82 can be prevented from being inclined. Thereby, the opposing space | interval of the comb-tooth which consists of the standing piece 83 or the contact piece 82, and the detection part of the sensor 9 can be kept appropriate, and it can prevent that the detection accuracy of rotational speed falls.
[0044]
In addition, the rotor 8 can be easily formed by making a plurality of cuts arranged in the circumferential direction on one side of the cylindrical body and alternately bending inward and outward in the radial direction.
[0045]
The present invention is not limited to the above-described embodiment, and various applications and modifications can be considered.
[0046]
(1) The shape of the rolling bearing 2 is not limited to the above-described embodiment. For example, in addition to the double-row outward angular ball bearing, various oblique contact rolling bearings such as tapered rollers may be used.
[0047]
(2) passive sensors definitive to the embodiment is an example, not limited to those having such a configuration.
[0048]
Further, the present invention can be applied to a rotation detector that can detect not only the rotation speed but also the rotation direction.
[0049]
(3) Each of the above embodiments is a rolling bearing for inner ring rotation, and the inner ring 21 is provided with an encoder. However, the outer ring 22 is a rolling bearing for outer ring rotation and serves as a rotating ring (in this case). The inner ring may be a fixed ring).
[0050]
【The invention's effect】
According to the rolling bearing device with a rotation detector of the present invention, it is possible to maintain the facing distance between the detection unit of the sensor and the detected unit at a predetermined size, and to prevent a decrease in the detection accuracy of the rotation speed. Is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vehicle hub unit to which a rolling bearing device with a rotation detector according to an embodiment of a reference example is applied.
FIG. 2 is a perspective view of a support ring of a rolling bearing device with a rotation detector in an embodiment of a reference example .
FIG. 3 is a mounting process diagram of a support ring of a rolling bearing device with a rotation detector in an embodiment of a reference example .
FIG. 4 is a front view of a pulsar ring of a rolling bearing device with a rotation detector in an embodiment of a reference example .
FIG. 5 is a cross-sectional view of a modification of the rolling bearing device with a rotation detector in the embodiment of the reference example .
6 is a perspective view of a support ring in the modified example of FIG. 5. FIG.
7 is a cross-sectional view of a vehicular hub unit according to the rotation detector equipped rolling bearing apparatus definitive to form state of the present invention.
8 is a perspective view of a rotor of a rotation detector equipped rolling bearing apparatus definitive to form state of the present invention.
[Explanation of symbols]
2 Rolling bearing 3 Support ring (encoder)
4 Pulsar ring (detected part)
5,9 Sensor 8 Rotor (encoder)
13, 14 Inner ring raceway 21 Inner ring (rotating wheel)
22 Outer ring (fixed ring)
23 Balls (rolling elements)
25, 26 Outer ring raceway 31, 81 Fixed piece 32 Contact piece 33 Standing piece 82 Contact piece (detected part)
83 Standing piece (Detected part)

Claims (1)

A fixed ring, having a rotating carrier rollers, and rolling elements arranged rollably between the fixed wheel the rotary wheel, the comb teeth are fixed to the rotating ring concentrically on an end edge of the rotating wheel rotor And a rolling bearing device with a rotation detector comprising a sensor that has a detection portion facing the comb teeth and a sensor that changes an output signal in response to a change in the characteristics of the comb teeth,
The rotor is made of a magnetic material, and a fixed piece press-fitted to the fixed wheel facing surface of the rotating wheel and an end edge of the fixed piece are alternately bent radially inward and outward to come into contact with the end surface of the rotating wheel. A rolling bearing device with a rotation detector, comprising a contact piece and a rising piece rising to the fixed wheel side, wherein the rising piece or the contact piece becomes the comb teeth.

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