JP2003287045A - Bearing device for wheel with power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device for a wheel with a generator wherein a setting space of the generator is easies to secured and lowering of sealing performance and arranging limitation of a peripheral parts by setting the generator are not incurred. <P>SOLUTION: This bearing device for the wheel with the generator is furnished with an outer member 1 and an inner member 2 positioned inside and outside through a plurality of rows of rolling elements 3. The outer member 1 is mounted on a car body. The inner member 2 has a wheel mounting flange 2a and the wheel is mounted on it. The generator 4 is provided to the side of an outboard rather than an arranging space of the rolling elements 3 on this bearing. The generator 4 generates power by relative rotation of the inner member 2 and the outer member 1. The generator 4 is composed of a multi- electrode magnet 42 mounted on the inner member 2 and a yoke 41 mounted on the outer member 2 and housing a coil 40. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel bearing device for an automobile or the like, and more particularly to a wheel bearing device equipped with a rotation sensor for an antilock brake and a generator serving as a power source of a wireless transmitter.

[0002]

2. Description of the Related Art Anti-lock braking system (ABS)
Is to obtain steering stability by detecting a tire lock on a low friction road or a panic brake and releasing the brake to secure a tire grip. A wheel rotation speed sensor for detecting tire lock is provided in the wheel bearing device. In general, this sensor is provided with a pulsar ring at an end portion of a bearing ring outside the bearing, and a sensor portion is provided facing the pulsar ring. However, since the pulsar ring and the sensor portion are exposed, there is a problem that it hinders the downsizing of the wheel bearing device. As a means for solving such a problem, there has been proposed a generator provided with a wheel rotation speed sensor, and a sensor capable of wirelessly transmitting a detection signal thereof.

FIG. 8 shows an example of a proposed bearing device for a wheel with a generator of this type. This bearing includes a multi-pole magnet 73 attached to the inner member 63 and a ring-shaped yoke 72 attached to the outer member 62 facing the multi-pole magnet 73 in the radial direction on the inboard side of the bearing. The generator 71 is configured to obtain a power generation output by the relative rotation of the inner and outer members 63, 62. A coil is provided in the yoke 72. The yoke 72 is fixed to the inner diameter surface of a ring-shaped fixing member 76 fitted to the outer member 62. The multi-pole magnet 73 is fixed to the outer diameter surface of a ring-shaped fixing member 75 fitted to the inner member 63. Fixing member 75
Is a member serving as a core metal of the multi-pole magnet 73, and has a portion serving as a slinger 75 a for the seal member 79.
A wireless transmission means 78 is installed on the fixing member 76 to which the yoke 72 is fixed, and the power generation output of the generator 71 is transmitted as a rotation detection signal to the outside of the bearing as a radio wave by the wireless transmission means 78. The outer member 62 is a knuckle 8
The outer ring 81 of the constant velocity universal joint is coupled to the inner member 81.

[0004]

In the bearing device for a wheel, the inboard side is in a severe environment where it is easily exposed to salt and muddy water and dust splashed from the road surface due to the positional relationship with the wheel and the tire house. To protect the rolling surface and the generator 71, reliable sealing performance is required. The sealing accuracy on the inboard side must be high to ensure the sealing performance. However, in the wheel bearing device of the example of FIG. 8, since the sealing member 79 is provided between the fixing members 75 and 76, the contact pressure of the sealing member 79 may be increased due to an error in the mounting position of the fixing members 75 and 76. There is a risk that the seal cannot be secured and the seal will be incomplete. For this reason, the cross-sectional area of the seal member 79 must be increased.
It may not be possible to secure such a large cross-sectional area. Further, because of the peripheral parts, the cross-sectional area of the generator 71 cannot be increased, and it is difficult to secure the power that can be generated.

If a seal member 79 is arranged directly between the outer member 62 and the inner member 63, as in a general wheel bearing device without the generator 71, the sealing performance can be secured, but outside of it. When arranging the generator 71, it becomes more difficult to secure a space for disposing the generator 71, and a means for sealing the generator 71 is additionally required.

It has been proposed to arrange the slinger 75a for the seal member 79 on the constant velocity universal joint outer ring 81 to expand the installation space of the generator 71 and the installation space of the seal member 79, but it is still sufficient. It is difficult to secure a large installation space. Depending on the sizes of the generator 71 and the seal member 79, it may not be possible to ensure the required thickness of the cup portion of the constant velocity universal joint outer ring 81.

For these reasons, the generator 71 is installed on the inboard side.
In order to obtain the required sealability,
It is difficult to secure an installation space for the generator 71 and the seal member 79. When the wireless transmission means 78 is provided, the installation space is further limited. Even if you can secure space,
When assembling the constant velocity universal joint outer ring 81 into the bearing device, and because the generator 71 is close to the bearing device, the generator 71 may come into contact with and damage the generator 71, resulting in poor assembly workability.

An object of the present invention is to provide a bearing device for a wheel with a generator, in which it is easy to secure a space for installing the generator and which is less susceptible to deterioration of sealing performance and restriction of arrangement of peripheral parts for installing the generator. It is to be.

[0009]

DISCLOSURE OF THE INVENTION A bearing device for a wheel with a generator according to the present invention has an inner member having an outer member having a double row of transfer surfaces on the inner periphery and a rolling surface facing each of these rolling surfaces. In a wheel bearing device that includes a square member and a double row rolling element that is housed between both rolling surfaces, and that rotatably supports a wheel with respect to a vehicle body, a multi-pole magnet and a coil are housed in the wheel bearing device. A generator composed of a yoke facing the multi-pole magnet is arranged on the outboard side of this bearing device. For example, the generator is arranged on the outboard side of the space where the double-row rolling elements are arranged. The multi-pole magnet of this generator is attached to one of the outer member and the inner member, and the yoke is attached to the other. According to this configuration, since the generator including the multi-pole magnet and the yoke is arranged on the outboard side of the bearing device,
Due to the installation of the generator, there are no restrictions on the dimensions of each component on the inboard side, and the component dimensions such as ensuring the sealing performance on the inboard side, which has severe sealing conditions, and securing the thickness of the outer ring of the constant velocity universal joint. Can be secured. The outboard side of the wheel bearing has a milder environment of salt muddy water and dust than the inboard side, and a seal with low water resistance is sufficient. for that reason,
By simply providing a simple seal, it is possible to protect the interior of the bearing and the generator as necessary, and it is easy to secure the installation space for the generator. Moreover, since there is no generator on the inboard side, when the constant velocity universal joint is incorporated into the inner member, there is no concern of contact with the generator, and the assembly is facilitated. The generator is, for example, a ring-shaped one in which the multi-pole magnets have magnetic poles arranged in the circumferential direction,
The yoke is formed of a magnetic ring. In this type of generator, electric power is generated between the multi-pole magnet and the yoke due to the mutual rotating action of the magnet, but it is easy to secure the generated output with a small cross-sectional size, and when the generator is used for rotation detection. By using multiple poles, highly accurate rotation detection can be performed.

In the present invention, a support plate fitted and attached to the outer diameter surface of the outer member may be provided, and the yoke may be fitted to the inner diameter surface of the support plate. By providing such a support plate, the yoke can be attached to the outer member by a fitting operation, and therefore the yoke can be easily attached. Also, unlike the one in which the yoke is fitted to the inner diameter surface of the outer member, the yoke can be arranged outside the outer member side by side with the end of the outer member, so that it is easy to secure the cross-sectional dimension of the yoke and the power generation output. Can be greatly obtained. When the support plate is provided, a seal member is provided between the support plate and the inner member,
The generator may be arranged inside the seal member.
When the generator is arranged inside the seal member, a material having low water resistance can be used as a material for the generator. Therefore, it is possible to freely select a material having excellent magnetic characteristics and improve power generation performance. The support plate may also serve as the core metal of the seal member that seals the end of the annular space between the outer member and the inner member. In this manner, by using one support plate for the core metal of the seal member and the member for mounting the yoke, the number of parts can be reduced, the number of assembling steps can be reduced, and the cost can be reduced. As described above, since the sealing environment is gentle on the outboard side, the sealing member need only have low water resistance, and thus the configuration in which the core metal is also used as a component can be easily realized.

An elastic material layer may be interposed between the support plate and the yoke. Since this elastic material layer is interposed between the support plate and the yoke, it has a function of preventing water from entering from the outside and a function of cushioning the shock of the yoke at the time of assembly or normal use. When providing the support plate,
A protective cover for protecting the generator from heat may be provided on the outer periphery of the support plate. Although the outboard side of the wheel bearing is a portion that is likely to receive the radiant heat of the brake rotor, by providing a protective cover, the generator can be protected from the heat of the brake rotor. Since the protective cover is provided on the outer periphery of the support plate, it is prevented that the support plate becomes hot and is transmitted to the generator.

In the present invention, the outer member is provided with the yoke, and the inner member is provided with the multi-pole magnet.
A seal member for sealing the end portion of the annular space between the outer member and the inner member is attached to the outer member, and the outer diameter of the multi-pole magnet is made smaller than the minimum diameter of the seal lip of the seal member. May be. When the outer diameter of the multi-pole magnet is made smaller than the minimum diameter of the seal lip of the seal member, the inner member having the multi-pole magnet on the outer diameter surface is inserted into the outer member with the seal member attached. When assembled, there is no interference between the multi-pole magnet and the seal member, and smooth assembly can be performed. The generator may be provided inside the seal member. In that case, a material with low water resistance can be used as the material of the generator.

In the present invention, a sensor may be provided which operates using the power generated by the generator as a power source. This sensor may be one that detects the number of revolutions or one that detects a matter other than rotation such as temperature and vibration. Since the generator is used as the power source, it is not necessary to route the power wiring, and the wiring system is simplified. Further, in the present invention, a transmission means for wirelessly transmitting at least one of the wheel rotation speed signal output by the generator and the output signal of the sensor operating with the generated power of the generator as a power source is provided near the yoke. Is also good. The wireless transmission means preferably uses the power generated by the generator as a power source. By providing wireless transmission means in this way,
It is possible to eliminate the signal wiring between the wheel bearing and the vehicle body.
Further, since the generator is used for rotation detection or sensor power supply, it is possible to eliminate the power supply wiring. Therefore, the wiring work can be omitted while using the bearing device with the detection function.
Assembly to the vehicle body can be easily performed.

[0014]

1 is a block diagram of a first embodiment of the present invention.
3 to FIG. This wheel bearing device is a rolling bearing in which a double row rolling element 3 is interposed between an outer member 1 and an inner member 2. The outer member 1 has double rows of rolling surfaces 31 and 32 on the inner circumference.
Rolling surfaces 33 and 34 respectively facing 2 are provided on the outer periphery of the inner member 2. The double row rolling element 3 has a rolling contact surface 3
It is accommodated between 1, 33 and between rolling surfaces 32, 34.
This bearing device is a double-row angular ball bearing, and the contact angles of the rolling surfaces 31 to 34 are formed so as to be back-to-back. The rolling elements 3 are held by the cage 10 for each row. Both ends between the inner and outer members 2 and 1 have a seal member 1
It is sealed with 1, 11A.

The outer member 1 has a vehicle body mounting flange 1 on its outer periphery.
a, and the vehicle body 13 is mounted through the vehicle body mounting flange 1a.
Mounted on. The outer member 1 is an integral member as a whole. The inner member 2 has a wheel mounting flange 2a at the end portion on the outboard side. The inner member 2 includes a hub wheel 2A having a wheel mounting flange 2a and an inner ring constituent member 2B which is a single row inner ring fitted to a small diameter portion formed at the other end of the hub wheel 2A. And inner ring constituent member 2B
The rolling surfaces 33, 34 of each row are formed in the. A wheel (not shown) having a brake rotor 14 is attached to the wheel attachment flange 2a with a bolt 15. Inner member 2
A shaft portion protruding from an outer ring cup portion of a constant velocity universal joint (not shown) is inserted into the inner periphery of the constant velocity universal joint, and the constant velocity universal joint is coupled to the inner member 2.

The generator 4 is arranged on the outboard side with respect to the bearing space in which the double row rolling elements 3 in this bearing device are arranged. The generator 4 includes a ring-shaped yoke 41 arranged side by side on the endboard of the outer member 1 on the outboard side, and an inner member 2 facing the inner peripheral side of the yoke 41.
And a ring-shaped multi-pole magnet 42 attached to the outer diameter surface of the. The yoke 41 constitutes a stator of the generator 4 together with the coil 40 provided inside. The multi-pole magnet 42 serves as a rotor of the generator 4, and is attached to the outer diameter surface of the inner member 2 by press fitting or adhesion or the like.

As shown in FIG. 3A, the multi-pole magnet 42
Is multi-polarized so that the magnetic poles NS are arranged at equal intervals in the circumferential direction. The yoke 41 is of a claw pole type. As shown in FIG. 2B, the yoke 41 is formed by facing two magnetic ring members 41a and 41b each having a groove-shaped cross-section that opens in the axial direction so that the openings face each other. And has a rectangular ring-shaped cross section. Both magnetic body ring members 41a,
The outer peripheral portion of 41b is fitted so that there is no gap on the fitting surface, thereby reducing the magnetic resistance in the magnetic circuit inside the yoke 41. Comb-tooth-shaped claws 41aa and 41ba extending in axially opposite relation to each other are formed in the portions of the magnetic ring members 41a and 41b that face the multi-pole magnets 42, in this embodiment, the inner peripheral wall portions. The two sets of claws 41aa and 41ba are alternately arranged in the circumferential direction with a gap therebetween. Each magnetic ring member 41a, 41b is manufactured by press forming.

In FIG. 2, the yoke 41 is provided with the coil 40 inside as described above, and changes in the interlinking magnetic flux due to the rotation of the multi-pole magnet 42 are taken out as electric power. In addition to the coil 40, a rectifying circuit (not shown) for rectifying the power output may be provided in the yoke 41. An internal elastic layer 43 made of an elastic adhesive layer or the like is provided in the gap between the inner surface of the yoke 41 and the coil 40. Inner elastic layer 4
3 electrically insulates the yoke 41 and the coil 40 and suppresses relative vibration between the both. This internal elastic layer 43
Also has an effect of buffering the force generated when the yoke 41 is press-fitted and attached to the bearing and not affecting the internal coil 40 and the like.

The yoke 41 is fitted inside the annular support plate 5,
It is attached to the outer member 1 via the support plate 5. Support plate 5
Is an annular member, and a part in the axial direction is fitted and attached to the outer diameter surface of the outer member 1. The support plate 5 is formed in a stepped cylindrical shape including a large diameter portion 51 and a small diameter portion 52, and a yoke 41 is fitted on the inner peripheral surface of the large diameter portion 51 via an elastic material layer 44. The elastic material layer 44 prevents water from entering from the outside and cushions impact. The elastic material layer 44 is the support plate 5
It may be attached to either the inner peripheral surface of the above or the outer peripheral surface of the yoke 41. The support plate 5 is attached to the outer diameter surface of the outer member 1 at the large diameter portion 51 by a strong fitting method such as metal fitting by press fitting. The support plate 5 engages with the side surface of the yoke 41 at the bent portion 53 between the large diameter portion 51 and the small diameter portion 52, and prevents the yoke 41 from coming off. The yoke 41 has the bent portion 5
3 and the end surface of the outer member 1 are sandwiched and fixed in the axial direction.

A seal member 11 is attached to the inner peripheral surface of the small diameter portion 52 of the support plate 5. The sealing member 11 is a core metal 11.
a and an elastic body 11b such as rubber or synthetic resin,
The elastic body 11b has a lip whose tip elastically contacts the inner member 2 (hub ring). The number of lips may be plural or one. The outer diameter portion of the core metal 11a is formed in a cylindrical shape, and the outer peripheral surface thereof is covered with a part of the elastic body 11b of the seal member 11. The seal member 11 is an outermost peripheral portion 11c covered by a part of the elastic body 11b, and is fitted to the inner peripheral surface of the support plate 5 to prevent water from entering the fitting portion with the support plate 5. A circumferential engaging groove 11d such as a circumferential groove is provided on the outer peripheral surface of the elastic body portion of the outermost peripheral portion 11c of the seal member 11, and a plurality of circumferentially protruding portions provided on the support plate 5 are provided. 52a fits in the engaging groove 11d,
The seal member 11 is prevented from coming off. The protrusion 52
“A” is a cut-and-raised piece obtained by bending a part of the support plate 5 inward.

The cylindrical outer diameter portion of the core metal 11a of the seal member 11 extends axially inward to a position close to the yoke 41. Therefore, when the protective cover 7 described later is fitted to the outer periphery of the support plate 5, the seal member 11 is fitted more firmly to the support plate 5 due to the diameter reduction due to the elastic deformation of the support plate 5. The minimum diameter of the seal member 11 is larger than the outer diameter of the multipolar magnet 42. Therefore, the multi-pole magnet 42 and the seal lip 11b do not interfere with each other, and the assembling thereof is done smoothly. The minimum diameter portion of the seal member 11 is the tip of the lip portion of the elastic body 11b.

On the outer surface of the support plate 5, for example, the outer surface of the large diameter portion 51, wireless transmission means 6 is attached as shown in FIG. The transmitting means 6 is one in which parts are housed in a case, and the case has an outer shape of a box shape, an arc shape, or an annular shape, and is welded, pin-tightened, or fitted to the outer surface of the support plate 5. It is fixed by. Inside the case of the transmitting means 6, a circuit board, which is a circuit portion provided with a rectifying circuit, a transmitting circuit and the like as the above-mentioned components, and an antenna are stored.
The transmission means 6 is assumed to transmit a signal by, for example, a weak radio wave. The signal may be one that turns on / off a radio wave, or one that modulates a carrier wave by frequency modulation or the like. The wireless transmission means 6 may perform transmission by magnetic coupling, transmission by light such as infrared rays, or transmission by ultrasonic waves in addition to transmission by radio waves, as long as it uses a signal for transmitting space. . The circuit portion of the transmitting means 6 may be arranged inside the yoke 41. The power generator of the wireless transmission means 6 is the generator 4. In addition to directly supplying the power output of the generator 4,
A capacitor, a secondary battery, or the like is charged and supplied to the wireless transmission means 6. Receiving means (not shown) for the wireless transmitting means 6 is installed, for example, in a tire house (not shown) of the vehicle body 13, and the signal is transmitted from the receiving means to the control unit of the antilock brake system.

A protective cover 7 is attached to the outer surface of the support plate 5. The protective cover 7 has a ring-shaped attachment portion 7a, and is attached to the support plate 5 by fitting the outer periphery of the small diameter portion 52 of the support plate 5 with the attachment portion 7a. The protective cover 7 is formed so as to cover the wireless transmission means 6, and functions to protect the generator 4 and the transmitter 6 from heat radiation of the brake rotor 14 mounted on the wheel side. The protective cover 7 has an opening on the inboard side in the portion covering the transmitter 6, and transmission is performed from this opening to the receiving means installed on the vehicle body side. Therefore, the transmission of the wireless transmission means 6 is not blocked by the protective cover 7. The protective cover 7 is configured so that only the fitting portion with the support plate 5 contacts the generator 4 and the other portions are exposed to the atmosphere. Therefore, the protective cover 7
Heat is efficiently shielded by the heat radiation effect of. A resin material having low thermal conductivity may be filled in the gap between the protective cover 7 and the transmitting means 6. By this filling, it is possible to prevent mud or the like from entering the gap without lowering the heat shield effect. As the protective cover 7 and the support plate 5, a metal that does not rust such as stainless steel is desirable.

According to the bearing device for a wheel with a generator having this structure, since the generator 4 is mounted on the outboard side, in order to install the generator 4, there is a dimensional limitation of each component on the inboard side. It never happens. Therefore, it is possible to secure the sealing performance by making the inboard sealing member 11A, which has severe sealing conditions, a sufficient size.
Further, the thickness of the outer ring (not shown) of the constant velocity universal joint connected to the inboard side of this bearing device can be secured. The environment of salt muddy water and dust on the outboard side is gentler than that on the inboard side, and the sealing member 11 may have low water resistance. Therefore, only by providing a simple seal member 11,
Necessary protection of the inside of the bearing and the generator 4 can be performed, and it is easy to secure an installation space for the generator 4. Further, since there is no generator 4 on the inboard side, when the constant velocity universal joint is incorporated into the inner member 2, there is no concern of contact with the generator 4, and the assembly is facilitated.

FIG. 4 shows a modification of the above embodiment. In this example, the rotation detecting sensor 45 is connected to the yoke 4 of the generator 4.
It is built in 1. The sensor 45 is composed of, for example, a Hall element, and is responsive to the magnetism generated by the rotation of the facing multi-pole magnet 42, and outputs this as a rotation speed signal. The power supply of the sensor 45 is supplied from the generator 4. Since other configurations are similar to those described above, common parts are designated by the same reference numerals, and description thereof will be omitted. In addition,
The sensor 45 is not limited to one that detects rotation, but may be one that detects temperature, vibration, or the like, and its installation position is not limited to the inside of the yoke 41, and may be the outer member 1 or its vicinity. .

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the support plate 5 also serves as the core metal of the seal member 11. The support plate 5 is formed with a seal core metal portion 54 extending further from the small diameter portion 52 toward the inner diameter portion side. The elastic body 11b of the seal member 11 is integrally attached to the seal core metal portion 54. When the support plate 5 also serves as the core metal of the seal member 11 in this way, the number of parts is reduced by one, and the number of assembly steps is reduced accordingly. Other configurations in this embodiment are the first
Is the same as the embodiment of.

FIG. 6 shows a third embodiment of the present invention.
In the wheel bearing device of this embodiment, the generator 4 is of an axial type, and the yoke 41 and the multipolar magnet 42 are axially opposed to each other. Yoke 4 as a stator
1 is arranged on the wheel-side end surface on the outboard side of the outer member 1 as in the above embodiments, and is fitted and fixed to the inner diameter surface of the support plate 5 fitted to the outer diameter surface of the outer member 1. ing. The multi-pole magnet 42 serving as a rotor is attached to the inner member 2 so as to face the yoke 41. Specifically, the multi-pole magnet 42 is in contact with the base portion of the wheel mounting flange 2a of the hub wheel 2A that constitutes the inner member 2, fits on the outer diameter surface of the hub wheel 2A, and is positioned in the axial direction. Although the yoke 41 is of a claw pole type, its comb-toothed claw is provided on the surface facing the multipolar magnet 42. This embodiment is suitable when it is difficult to secure a space in the radial direction. Other configurations in this embodiment are the same as those in the first embodiment.

FIG. 7 shows a fourth embodiment of the present invention. This embodiment is similar to the third embodiment in that the yoke 4
1 and a multi-pole magnet 42 are axially opposed to each other, but the support plate 5 for fixing the yoke 41 also serves as the core metal of the seal member 11 as in the second embodiment (FIG. 5). There is something to do. The support plate 5 further extends from the small diameter portion 52 toward the inner diameter portion side to form a seal core metal portion 54.
The elastic body 11b of the seal member 11 is attached to the seal core metal portion 54.
Are integrally attached. Other configurations are the same as those of the third embodiment shown in FIG.

In each of the above embodiments, the yoke 41 is attached to the outer member 1 side and the multi-pole magnet 42 is attached to the inner member 2 side. However, conversely, the outer member 1 is attached. A yoke may be attached to the inner member 2 and a multi-pole magnet may be attached to the inner member 2. Further, as a modification of the first embodiment, an example (FIG. 4) in which the sensor 45 that operates using the generated power of the generator 4 as a power source is provided is shown. It can also be applied to the form.

[0030]

In the bearing device for a wheel with a generator of the present invention, since the generator is arranged on the outboard side, it is easy to secure the installation space for the generator, and the sealing performance is reduced and the surrounding area is required for the installation of the generator. There are few restrictions on the placement of parts. For example, on the inboard side where high-precision sealing performance is required, a space for maintaining the required sealing performance, such as increasing the contact margin of the seal lip, while ensuring the wall thickness of the constant velocity universal joint outer ring, etc. Can be secured. Since the sealing conditions on the outboard side are looser than those on the inboard side, even if a generator is provided, the seal inside the bearing and the generator can be secured with a simple seal. Further, since there is no generator on the inboard side, there is no concern of contact with the generator when the constant velocity universal joint is assembled, and the assembly is easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a bearing device for a wheel with a generator according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the same portion.

FIG. 3 is a front view of a generator of the bearing device and a broken side view of a yoke thereof.

FIG. 4 is a partially enlarged cross-sectional view showing a modified example of the same embodiment.

FIG. 5 is a partially enlarged cross-sectional view of the second embodiment.

FIG. 6 is a partially enlarged cross-sectional view of a third embodiment.

FIG. 7 is a partially enlarged cross-sectional view of a fourth embodiment.

FIG. 8 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Outer member 2 ... Inner member 3 ... rolling elements 4 ... Generator 5 ... Support plate 6 ... Wireless transmission means 7 ... Protective cover 11 ... Seal member 31, 32, 33, 34 ... Rolling surface 40 ... coil 41 ... York 42 ... Multi-pole magnet 44 ... Elastic material layer 45 ... Sensor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01P 3/487 G01P 3/487 C 5H621 G08C 17/02 H02K 5/00 A H02K 5/00 21/12 G 21/12 G08C 17/00 B (72) Inventor Hiroaki Ohba 1578 Higashi-Kaizuka, Iwata-shi, Shizuoka Entien Co., Ltd. (72) Inventor Eiji Tajima 1578 Higashi-Kaizuka, Iwata-shi, Shizuoka F-Term (Reference) ) 2F073 AA35 AB11 BB01 BC02 CC01 EE11 GG04 3D046 BB11 BB28 HH36 3J016 AA01 BB03 CA02 CA03 CA06 3J101 AA02 AA32 AA43 AA54 AA62 BA77 FA46 GA03 5H605 A03 JH16A03 JH16A03 JH16A16 JH16A06H16A16H16A16H16A16B16H16A16H16A06H16A16H033A0H16A03

Claims (10)

[Claims] 1. An outer member having double rows of transfer surfaces on its inner circumference, an inner member having rolling surfaces facing each of these rolling surfaces, and a double row of members housed between both rolling surfaces. In a bearing device for a wheel, which includes a rolling element and rotatably supports a wheel with respect to a vehicle body, a generator including a multi-pole magnet and a yoke that houses a coil and faces the multi-pole magnet is provided. A bearing device for a wheel with a generator arranged on the outboard side of the device, wherein a multi-pole magnet of the generator is attached to one of the outer member and the inner member and the yoke is attached to the other. . 2. The bearing device for a wheel with a generator according to claim 1, wherein the multi-pole magnet is a ring-shaped one in which magnetic poles are arranged in a circumferential direction, and the yoke is a magnetic ring. 3. The generator according to claim 1, wherein a support plate fitted and attached to the outer diameter surface of the outer member is provided, and the yoke is fitted to the inner diameter surface of the support plate. Wheel bearing device. 4. The bearing device for a wheel with a generator according to claim 3, wherein a seal member is provided between the support plate and the inner member, and the generator is arranged inside the seal member. 5. The support plate according to claim 3 or 4, wherein the support plate also serves as a core metal of a seal member for sealing an end portion of an annular space between the outer member and the inner member. Bearing device for wheels with generator. 6. The bearing device for a wheel with a generator according to claim 3, wherein an electrically insulating elastic material layer is interposed between the support plate and the yoke. 7. The bearing device for a wheel with a generator according to claim 3, wherein a protective cover for protecting the generator from heat is provided on an outer periphery of the support plate. 8. The yoke is provided on the outer member, the multi-pole magnet is provided on the inner member, and an end portion of an annular space between the outer member and the inner member is provided on the outer member. A seal member for sealing is attached, and the outer diameter of the multi-pole magnet is smaller than the minimum diameter of the seal lip of the seal member.
A bearing device for a wheel with a generator according to claim 7. 9. The bearing device for a wheel with a generator according to claim 1, further comprising a sensor that operates using power generated by the generator as a power source. 10. A transmission means for wirelessly transmitting at least one of a wheel rotation speed signal output from a generator and an output signal from a sensor operating with power generated by the generator as a power source is provided near the yoke. A bearing device for a wheel with a generator according to any one of claims 1 to 9.