JP2003274622A - Bearing apparatus and generator therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a generator for a bearing apparatus wherein assembly is easy while stably holding a coil in a yoke is enabled, and the bearing apparatus on which the generator is mounted. <P>SOLUTION: This generator for a bearing apparatus is constituted of the yoke 7 in which the coil 8 is accommodated and a magnet which is arranged opposite to the yoke 7. The yoke 7 and the magnet are installed on an external and an internal rail rings of a rolling bearing. A wiring of the coil 8 is solidified by an adhesive sheet 12 and bonded to a coil bobbin 11, which is bonded and fixed to an inner surface of the yoke 7 by using adhesive sheets 13a, 13b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device generator that is installed in a wheel bearing device or other bearing device to generate electric power, and a bearing device equipped with the generator.

[0002]

2. Description of the Related Art A generator of this type comprises a rotor installed on the rotary member side of a bearing device and a stator installed on the fixed member side opposite to the rotor. The rotor is composed of a ring-shaped multi-pole magnet in which magnetic poles N and S are alternately arranged in the circumferential direction. The stator has a coil housed in a yoke made of a magnetic ring.

FIG. 9 shows an enlarged sectional view of a stator in a conventional example of such a generator. This stator 41 is
Two magnetic ring members 49a and 49b, which are formed in a groove shape in cross section and open to the side, are fitted so that their openings face each other to form a yoke 47 having a rectangular cross section. A coil 48 wound around a bobbin 51 having a groove-shaped cross section is housed in the yoke 47 to form a stator 41. In the stator 41 in which the coil 48 is housed in the yoke 47 as described above, if there is an axial gap between the inner surface of the yoke 47 and the bobbin 51 of the coil 48, it may cause vibration and cause disconnection. Become. If the design does not have a gap, machining accuracy and assembling accuracy are required, and an excessive load may be applied to the bobbin 51 due to various factors, resulting in damage.
In addition, the winding of the coil 48 wound around the bobbin 48 may be partially loosened during long-term use if it is simply wound, leading to deterioration of magnetic characteristics and disconnection. For this reason, conventionally, in order to integrate the coil 48 with the yoke 47, the magnetic ring members 49a, 4a constituting the yoke 47 are formed.
An elastic adhesive or a molding resin 52 is filled in a gap between the 9b and the bobbin 51 or the coil 48.

[0004]

However, since the coil 48 is built in the yoke 47, when a resin material or the like is molded inside the yoke 47, pressure is applied by a method such as an injection molding method. It is necessary to pour the molding material. Therefore, the yoke 47 has to be provided with a large hole for injection. This injection hole complicates the assembly process of the yoke 47 and the filling process of the mold resin 52, etc., and causes a decrease in the amount of power generation. That is, the yoke 47 is 2
Since the two magnetic material ring members 49a and 49b are fitted together, when the injection hole is provided in the fitting portion, the magnetic material ring members 49a and 49b must be positioned so that the holes are aligned at the time of fitting. Therefore, the assembly of the yoke 47 becomes complicated. Further, since the magnetic resistance of the yoke 47 increases due to the formation of the injection hole, the power generation amount decreases. further,
As shown in Fig. 9, in the case of a claw pole type generator,
Since many comb tooth-shaped claws 50a and 50b are formed on the surface of the yoke 47 facing the rotor, when pouring the mold resin 52, the claws 50a and 50b do not leak from the gap between the claws 50a and 50b. You don't have to put a seal,
The work becomes complicated. The same applies to the case of injecting the elastic adhesive, and in order to prevent the adhesive from leaking through the gap between the claws 50a and 50b, it is necessary to accurately control the thickness of the adhesive or apply a seal. You will need it.

An object of the present invention is to facilitate the assembling work and the processing of parts while ensuring the stable holding of the coil in the yoke and the protection of the coil when a load is applied. It is an object of the present invention to provide a bearing device generator that does not reduce the amount of power generation. Another object of the present invention is to provide a bearing device which prevents loosening of coil windings, facilitates assembly work and processing of parts, and does not cause a reduction in power generation amount for convenience of assembly. It is to provide a generator. Still another object of the present invention is to prevent an increase in assembling work even when a yoke having a comb tooth-shaped claw is used. Still another object of the present invention is to provide a bearing device with a generator, which is excellent in the assemblability of the generator and the power generation performance.

[0006]

To solve the above problems, the bearing device generator of the present invention can be mounted on a bearing device having an inner ring, an outer ring, and at least one row of rolling elements, a magnet, and A generator for a bearing device, comprising a yoke arranged inside the yoke and facing the magnet and having a coil inside thereof, to generate electric power by relative rotation of an inner ring and an outer ring, wherein the yoke and the coil in the yoke are bonded and fixed by an adhesive sheet. It is characterized by having done. According to this structure, since the yoke and the coil in the yoke are bonded and fixed by the adhesive sheet, the yoke and the coil are integrated and the rattling of the coil in the yoke is prevented, and the yoke is incorporated in the bearing. Even when a large load is applied to the yoke, the deformation is absorbed by the thickness of the adhesive sheet, and damage to the coil bobbin is avoided. Since the adhesive sheet is used, the work of integrating the yoke and the coil can be easily performed. Therefore, unlike the conventional case, it is not necessary to provide a resin injection hole in the yoke, and it is possible to omit the hole processing and improve the assemblability, and there is no increase in the magnetic resistance of the yoke due to the injection hole. It is advantageous in securing. Further, since the adhesive sheet is used to fix the coil to the yoke, it is not necessary to control the film thickness when the conventional adhesive is used, and in this respect, the yoke can be easily assembled and the cost can be reduced.

In the present invention, the coil winding may be integrated by using an electric wire having a self-bonding type coating for the coil winding. With this configuration, the coil winding is prevented from being partially loosened over a long period of time, and there is no risk of deterioration of magnetic characteristics or disconnection due to loosening. Also,
Since the windings are integrated with each other, the coil bobbin can be omitted, which allows the generator to be downsized and the cost to be reduced.

Another generator for bearing device according to the present invention can be mounted on a bearing device having an inner ring, an outer ring, and at least one row of rolling elements, and has a magnet and a coil inside which is opposed to the magnet. A generator for a bearing device, comprising a yoke and generating electric power by relative rotation of an inner ring and an outer ring, characterized in that the winding of the coil is fixed by an adhesive sheet and adhered to a coil bobbin. in this way,
When the coil winding is fixed with an adhesive sheet and adhered to the coil bobbin, loosening of the coil winding is prevented during long-term use, and there is no fear of deterioration of magnetic characteristics or disconnection due to loosening. Since the adhesive sheet is used, the winding of the coil can be easily hardened and can be adhered to the coil bobbin. Therefore, the use of the conventional resin mold or elastic adhesive can be omitted, and each problem in the case of using these resin mold and elastic adhesive can be solved.

In the present invention, the coil winding is fixed with an adhesive sheet and adhered to the coil bobbin.
It may be fixed to the yoke by an adhesive sheet. With this configuration, the coil winding can be prevented from loosening, the coil can be stably integrated without rattling the yoke, and the bobbin can be prevented from being damaged when a load is applied. Moreover, the assembling property and the power generation performance are excellent.

In the present invention, the yoke is a magnetic ring member, and two sets of comb-shaped claws extending in mutually opposite directions are formed in a portion facing the magnet, and the claws of both sets are circular. It may be arranged alternately in the circumferential direction with a gap. In the case of the so-called claw pole type having the comb-teeth-like claws as described above, it is possible to perform small-sized and efficient power generation, and when it is used for rotation detection, it is easy to make multiple poles and accurate rotation detection can be performed. In the case of the claw pole type, conventionally, a sealing process for preventing the adhesive or the mold resin from leaking is required, but the configuration using the adhesive sheet according to the present invention makes the sealing process unnecessary.

The bearing device of the present invention includes the bearing device generator having any one of the above-described configurations of the present invention. According to the bearing device having this configuration, the above-described effects of the bearing generator of the present invention can be obtained, and the bearing device with the generator is excellent in the assemblability of the generator and the power generation performance.

The bearing device having the above structure of the present invention may be a bearing device for wheels. This wheel bearing device is housed between an outer member having a double row rolling contact surface on the inner circumference, an inner member having rolling contact surfaces facing each of these rolling contact surfaces, and an opposing rolling contact surface. And a double-row rolling element, which rotatably supports the wheels with respect to the vehicle body. The wheel bearing device is required to have a wheel rotation speed detection function as an additional function, and is used when a bearing device with a power generation function is used to secure the power supply for the rotation detection and detection signal processing. High value. In addition, wheel bearings are subject to severe operating conditions in which they are susceptible to vibrations and to rainwater and dust when exposed to the road surface, and stable support of coils is essential when bearings are equipped with a generator. Becomes Moreover, there is a strong demand for cost reduction. Therefore, the effect of applying the bearing device with the generator of the present invention is great.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention, which shows a bearing device equipped with a bearing device generator. This bearing device is a rolling bearing having an inner ring 1, an outer ring 2 and one or more rows of rolling elements 3, and includes a rolling surface 1a provided on the outer periphery of the inner ring 1 and an outer ring 2 facing the rolling surface 1a. One row of rolling elements 3 is housed between the rolling elements 2 and the rolling surface 2a provided on the circumference. The rolling element 3 is held by a cage 4. The generator 5 is installed at one end of the annular space between the inner ring 1 and the outer ring 2,
Electric power is generated by the relative rotation of the inner ring 1 and the outer ring 2.

The generator 5 is shown in FIG. 3 (A) showing its front view.
As described above, the multi-pole magnet 6 and the ring-shaped yoke 7 that is arranged opposite to the outer peripheral side of the multi-pole magnet 6 and has the coil 8 inside are provided. The multi-pole magnet 6 is multi-polarized so that the magnetic poles N and S are arranged at equal intervals in the circumferential direction. Multi-pole magnet 6
Are fitted and attached to the outer diameter surface of the inner ring 1. The yoke 7 is fitted and attached to the inner diameter surface of the outer ring 2.

The yoke 7 is of a claw pole type.
As shown in the cross-sectional view of FIG. 3B, the yoke 7 has two magnetic ring members 9a and 9b each having a groove-shaped cross-section that opens in the axial direction, the openings facing each other. As described above, the ring members are fitted to each other and have a rectangular cross section. Each magnetic ring member 9
In the inner peripheral side portions of a and 9b facing the multi-pole magnet 6,
As shown in the exploded cross-sectional view of FIG. 4, comb tooth-shaped claws 10a and 10b extending axially opposite to each other are formed.
The claws 10a and 10b of the set are alternately arranged in the circumferential direction with a gap therebetween. The magnetic ring members 9a and 9b are
It is manufactured by press molding.

The coil 8 inside the yoke 7 is wound inside the groove of a ring-shaped coil bobbin 11 having a groove-shaped cross-section opening to the outer diameter side. This coil bobbin 1
The coil 8 is housed inside the yoke 7 by installing 1 inside the yoke when assembling the yoke 7. At this time, a thermosetting adhesive sheet 12 made of an epoxy adhesive or the like is wound around the outer diameter side of the coil 8. Further, as shown in FIG. 4 showing an exploded cross-sectional view of the yoke 7, when assembling the yoke 7, the side surface portions 9aa and 9ba of both magnetic ring members 9a and 9b constituting the yoke 7 and both side surface portions 11a of the coil bobbin 11 are 11b, a thermosetting adhesive sheet 13a made of an epoxy adhesive or the like,
13b is sandwiched. In this case, the thermosetting adhesive sheets 13a and 13b are formed into a donut shape along the yoke 7 by punching or the like. In this way, the coil 8,
Coil bobbin 11, thermosetting adhesive sheets 12, 13a,
The assembled yoke 7 having 13b installed therein is fired in a firing furnace to melt the adhesive sheets 12, 13a, 13b. As a result, the coil 8 is adhesively fixed to the coil bobbin 11 by the melted adhesive sheet 12, and the coil bobbin 11 is adhesively fixed to the yoke 7 by the melted adhesive sheets 13a and 13b.

As shown in FIG. 1, on one side surface of the yoke 7, a wireless transmission means 14 that uses the output of the generator 5 is installed. This transmitting means 14 takes out the power generation output of the generator 5 as a rotation detection signal and transmits it to a receiving means (not shown) by wireless transmission. The transmitting means 14 is, in addition to a transmitting circuit and a transmitting antenna that transmit a rotation detection signal as a radio wave, a signal processing circuit that processes a power generation output as a rotation detection signal, a power supply circuit that supplies the power generation output as a power source of the circuit, and the like. Composed. When a sensor for rotation detection is installed separately from the generator 5 in the bearing device or in the vicinity thereof, the same wireless transmission means 14 should be used and the power output of the generator 5 should be used as the power source. You can

According to the bearing device generator 5, the yoke 7 and the bobbin 11 of the coil 8 in the yoke 7 are bonded and fixed by the adhesive sheets 13a and 13b.
The coil 8 is prevented from rattling inside. Since the magnetic body ring members 9a and 9b forming the yoke 7 are pressed products, it is difficult to obtain high flatness accuracy, but even if the magnetic body ring members 9a and 9b have a partial warp,
It can be absorbed by the thickness of the adhesive sheets 13a and 13b. In addition, since the winding of the coil 8 is fixed by the adhesive sheet 12 and adhered to the coil bobbin 12, the coil winding is prevented from being loosened during use, and there is no fear of deterioration of magnetic characteristics or disconnection due to loosening. . Therefore, unlike the conventional case, it is not necessary to provide a mold resin injection hole in the yoke, the yoke 7 can be easily assembled, and the cost can be reduced. Since the injection hole can be omitted, there is no increase in the magnetic resistance of the yoke 7 due to the injection hole, which is advantageous in securing the amount of power generation. Further, since the adhesive sheets 12, 13a, 13b are used to fix the coil 8 to the yoke 7, it is not necessary to control the film thickness of the adhesive when using the conventional elastic adhesive, and in this respect also, Assembling becomes easy and cost can be reduced. Yoke 7 of generator 5
Are two sets of comb-teeth-shaped claws 10 in the portion facing the multi-pole magnet 6.
Since the a and 10b are of a claw pole type formed to face each other, compact and efficient power generation can be performed, and when used for rotation detection, multipolarization is easy and high detection accuracy can be obtained. Adhesive sheet 1 even with claw pole type
Since 2, 13a and 13b are used, unlike the case of the conventional resin mold, a sealing process for preventing the resin from leaking from the gap between the comb-teeth-shaped claws 10a and 10b is unnecessary. It will be easier. By using the generator 5 having such a configuration, the bearing device with a generator can be easily assembled.

In the above embodiment, the coil bobbin 1
Although the coil 8 wound around 1 is housed in the yoke 7, the present invention is not limited to this, and the coil 8 is wound by using an electric wire having a self-bonding type coating as a coil winding, and the coil 8 is solidified by firing. Is also good. As a result, the coil bobbin 11 may be omitted and the solidified coil 8 may be directly housed in the yoke 7 as shown in FIG. In this case, both side surface portions 9 of the yoke 7
After sandwiching the thermosetting adhesive sheets 13a and 13b between the aa and 9ba and the coil 8 in the same manner as in the above embodiment,
By firing the yoke 7 and melting the adhesive sheets 13a and 13b, the coil 8 can be adhesively fixed to the yoke 7.

With this structure, the coil bobbin 1
The generator 5 can be downsized and the cost can be reduced by the amount that 1 can be omitted.

FIG. 6 shows an example in which the bearing device generator 5 according to the above-described embodiment is mounted on a wheel bearing device. This wheel bearing device is a bearing device that rotatably supports a wheel with respect to a vehicle body, and its fixing member 21 is an outer member 22.
And knuckle 30. The outer member 22 is a flange 22.
It is attached to the knuckle 30 via a. The knuckle 30 is fixed to the vehicle body. The outer member 22 has double rows of rolling contact surfaces 25a and 25b on the inner circumference.
Rolling surfaces 26 a and 26 b facing the respective 25 b are provided on the outer circumference of the inner member 23. The inner member 3 serves as a rotating member, and is formed by combining a hub wheel 23a and another inner ring constituent member 23b. Each of the hub wheel 23a and the inner ring constituent member 23b has the double row rolling surface 26.
Rolling surfaces 26a and 26b of each row of a and 26b are formed. The double row rolling elements 24 include rolling surfaces 25a, 26
It is accommodated between a and between the rolling surfaces 25a and 26b. The rolling elements 24 are held by a retainer 28 for each row. Outer member 22, inner member 23, rolling element 24 and cage 2
8 constitutes a rolling bearing, and the outer member 22 and the inner member 23 serve as bearing rings. Outer rolling element 2
4, the annular space between the outer member 22 and the inner member 23 is sealed by the seal members 29, 29 on the outer side of the bearing 4 and on the outer side of the inner rolling element 24, respectively.

The generator 5 according to the first embodiment is built in the annular space between the inner and outer members 23, 22. The generator 5 is arranged between the rolling elements 24, 24 in both rows. The yoke 7 is fitted and attached to the inner diameter surface of the outer member 22, which is the fixed side, and serves as the stator of the generator 5. The multi-pole magnet 6 is attached to the inner member 23 and serves as the rotor of the generator 5.

The wireless transmission means 14 is attached to the outer surface of the outer member 22. The wireless transmission means 14 transmits the rotation detection signal by radio waves as in the first embodiment, and the generator 5 is used as a power source of the wireless transmission means 14 as in the first embodiment. Is the same. Receiving means (not shown) for the wireless transmitting means 14 is installed in, for example, a tire house of a vehicle body,
A signal is transmitted from the receiving means to the control section of the antilock brake system. The generator 5 and the wireless transmission means 14 are electrically connected by a connecting member 32 that is inserted into a radial hole 31 provided in the outer member 22.

7 and 8 show an embodiment in which an axial type generator is used. FIG. 7 is a cross-sectional view showing a bearing device equipped with the bearing device generator 5A of this embodiment, and FIG.
FIG. 4 is a sectional view showing a yoke 7 in the generator 5A. In this embodiment, the multi-pole magnet 6 provided on the inner ring 1 side is installed so that the magnetized surface where the magnetic poles N and S are arranged in the circumferential direction is oriented in the axial direction. Yoke 7 provided on the outer ring 2 side
Are installed so as to face the magnetized surface of the multi-pole magnet 6 in the axial direction. The yoke 7 is configured by combining three magnetic ring members 9a to 9c on the outer diameter side, the middle portion, and the inner diameter side. The intermediate magnetic ring member 9b has a groove-shaped cross-sectional shape that opens in the axial direction. The magnetic body ring member 9a on the outer diameter side has a cylindrical portion overlapping the outer circumference of the intermediate magnetic body ring member 9b, and is bent toward the inner diameter side from one end (the opening side end of the intermediate magnetic body ring member 9b) of this cylindrical portion. It has a comb-shaped claw. Inner diameter side magnetic ring member 9c
Has a cylindrical portion that overlaps the inner circumference of the intermediate magnetic ring member 9b, and a comb-tooth-shaped claw that is bent from one end of this cylindrical portion toward the outer diameter side. Inner and outer magnetic ring members 9a, 9
The claws of c are arranged alternately at intervals in the circumferential direction and face the multipole magnet 6. The coil bobbin 11 has a ring-shaped cross-section having a groove shape that opens to the outer diameter side, and the coil 8 is wound in the groove. This coil bobbin 11
The coil 8 wound around the coil is installed inside the yoke 7.

In this embodiment, as in the case of the first embodiment, the thermosetting adhesive sheet 12 made of an epoxy adhesive is wound around the outer diameter of the coil 8 and the yoke 7 is used.
At the time of assembly, between the inner diameter surface portion 9bb of the magnetic body ring 9b and the groove bottom portion 11c of the coil bobbin 11 and between the side surface portion 9ba of the magnetic body ring 9b and the one side surface portion 11b of the coil bobbin 11 when assembling the yoke 7. , Thermosetting adhesive sheets 15a and 15b made of an epoxy adhesive or the like are sandwiched. By baking the yoke 7 in a baking furnace, the thermosetting adhesive sheets 12, 15a, 15b are melted. Thus, the coil 8 is bonded and fixed to the coil bobbin 11 by the thermosetting adhesive sheet 12, and the coil bobbin 11 is bonded and fixed to the yoke 7 by the thermosetting adhesive sheets 15a and 15b, so that the coil 8 is integrated with the yoke 7. It Other configurations are the same as those in the first embodiment.

[0026]

The bearing device generator of the present invention is provided with an inner ring,
For a bearing device that can be mounted on an outer ring and a bearing device that has at least one row of rolling elements, and that includes a magnet and a yoke that has a coil inside and that faces the magnet and that generates electric power by relative rotation of the inner ring and the outer ring In the generator, the above-mentioned yoke and the coil inside this yoke are adhered and fixed by the adhesive sheet, so that it is possible to maintain stable coil inside the yoke and protect the coil when a load is applied. Since it is not necessary to provide a mold resin injection hole in the yoke, the yoke can be easily assembled and processed. Also,
There is no increase in the magnetic resistance of the yoke due to the injection hole, which is advantageous in securing the amount of power generation. Further, since the adhesive sheet is used, unlike the case where the adhesive is used, the film thickness control is unnecessary, the assembly is facilitated, and the cost can be reduced. Even when the generator is a claw pole type, there is no need for a sealing process to prevent the adhesive or the molding resin from wrapping around the gap between the comb-shaped claws as in the conventional case. In this respect, the yoke can be easily assembled. Become. In another bearing device generator of the present invention, the coil winding is hardened with an adhesive sheet and adhered to the coil bobbin, so that the conventional resin mold or elastic adhesive is used while preventing the coil winding from being loosened. And the problems associated with the use of these resin molds and elastic adhesives are eliminated. Since the bearing device of the present invention includes the bearing device generator of the present invention, the bearing device with the generator is excellent in the assembling property of the generator and the power generation performance.
In particular, when applied to a wheel bearing device, each effect of the bearing device generator of the present invention is effectively exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing device equipped with a bearing device generator according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a yoke in the generator.

FIG. 3A is a front view of the generator, and FIG. 3B is a sectional view of a yoke of the generator.

FIG. 4 is an exploded sectional view of the generator yoke.

FIG. 5 is an enlarged cross-sectional view showing another example of the generator yoke.

FIG. 6 is a cross-sectional view of a wheel bearing device equipped with the same generator.

FIG. 7 is a sectional view of a bearing device equipped with a bearing device generator according to another embodiment of the present invention.

FIG. 8 is an enlarged cross-sectional view of a yoke in the generator.

FIG. 9 is an enlarged sectional view of a conventional yoke.

[Explanation of symbols]

1 ... Inner ring 2 ... Outer ring 3 ... rolling elements 5, 5A ... Generator 6 ... Multi-pole magnet 7 ... York 8 ... coil 9a, 9b ... Magnetic ring member 10a, 10b ... Comb-shaped claws 11 ... Coil bobbin 12 ... Thermosetting adhesive sheet 13a, 13b ... Thermosetting adhesive sheet 15a, 15b ... Thermosetting adhesive sheet 22 ... Outer member 23 ... Inner member 25a, 25b ... Rolling surface 26a, 26b ... Rolling surface 24 ... Rolling element

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroaki Ohba             Entier, 1578 Higashi-Kaizuka, Iwata City, Shizuoka Prefecture             Nu Co., Ltd. F term (reference) 5H605 BB01 BB11 BB20 CC04 EA06                       EB01 EB10                 5H621 AA03 BB07 HH01 JK02

Claims (7)

[Claims] 1. An inner ring, an outer ring, and a bearing device having at least one row of rolling elements, the magnet being able to be mounted, and a yoke having a coil inside, the magnet being opposed to the magnet. A bearing device generator that generates electric power by rotation, wherein the yoke and the coil in the yoke are bonded and fixed by an adhesive sheet. 2. The generator for a bearing device according to claim 1, wherein the coil winding is integrated by using an electric wire having a self-fusion type coating on the coil winding. 3. An inner ring, an outer ring, and a bearing device having at least one row of rolling elements, which is mountable to a bearing device, and which includes a magnet and a yoke having a coil inside and facing the magnet. A bearing device generator that generates electric power by rotation, wherein the winding of the coil is fixed by an adhesive sheet and bonded to a coil bobbin. 4. The generator for a bearing device according to claim 1, wherein the coil winding is fixed by an adhesive sheet and adhered to the coil bobbin, and the yoke is adhered and fixed to the yoke by the adhesive sheet. 5. The yoke is a ring member made of a magnetic material and extends in a direction facing each other at a portion facing the magnet.
The generator for bearing device according to any one of claims 1 to 4, wherein a pair of comb-shaped claws are formed, and the claws of both groups are alternately arranged in the circumferential direction with a gap therebetween. 6. A bearing device comprising the generator for a bearing device according to claim 1. Description: 7. An outer member having a double row rolling contact surface on the inner circumference, an inner member having rolling contact surfaces facing each of these rolling contact surfaces, and a compound member housed between the opposing rolling contact surfaces. The bearing device according to claim 6, which is a bearing device for a wheel, which includes a row of rolling elements and rotatably supports a wheel with respect to a vehicle body.