JP2003278779A - Power generator-equipped wheel bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generator-equipped wheel bearing device for a driven wheel wherein the number of part items and costs are reduced by eliminating the need to install seal members in a generator installation part. <P>SOLUTION: An outer member 1 and an inner member 2 are rotatable relative to each other via a plurality of rows of rolling elements 3. The outer member 1 is mounted to a vehicle body and a wheel is mounted to the inner member 2. A cover 12 for covering the overall end of the bearing device is mounted to the outer member 1. A generator 4 which generates electric power using the relative rotation between the outer member 1 and the inner member 2 is arranged inside the cover 12. <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 bearing device for a wheel with a generator used in an automobile or the like equipped with an antilock brake device, and more particularly to a bearing device for a wheel suitable for supporting driven wheels.

[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. Conventionally, as a wheel bearing device with a built-in sensor, FIG.
The ones shown in are proposed. The bearing device in the figure is for supporting the driven wheels, but has the same generator installation structure and seal structure as the bearing device for supporting the drive wheels. This bearing device includes an outer member 41 having double rows of rolling surfaces 46 and 47 on the inner circumference, and an inner member 42 having rolling surfaces 48 and 49 facing the rolling surfaces 46 and 47, respectively.
And a generator 44, which is composed of double rows of rolling elements 43 accommodated in each of the rolling surfaces 46 to 49 and has a rotation sensor at one end in an annular space between the outer member 41 and the inner member 42. is set up. The outer member 41 is attached to the vehicle body by an outer peripheral flange 41a, and the wheel is attached to a flange 42a at one end of the inner member 42. Both end portions of the annular space between the outer member 41 and the inner member 42 have seal members 51 and 51A, respectively.
Sealed with. The generator 44 is an axial type in which a magnetic ring 52 containing a coil 45 and a ring-shaped multi-pole magnet 53 are axially opposed to each other. Multi-pole magnet 5
3 is provided integrally with a slinger 54 that is provided on the inner member 42 that is a rotating member and that serves as a seal contact portion of the seal member 51A. The magnetic ring 52 is installed at the end of the outer peripheral member 41 that is a fixed member, and the power generation output of the generator 44 generated by the rotation of the inner member 42 is used as the rotation speed detection signal. A seal member 56, which is in sliding contact with the end surface of the inner member 42, is provided on the inner peripheral portion of the magnetic body ring 52.
A foreign substance is prevented from entering and being caught between the multi-pole magnet 53 and the multi-pole magnet 53. Wireless transmission means 55 is provided on the side surface of the magnetic body ring 52. The rotation speed detection signal obtained from the generator 44 is transmitted as a radio wave by the wireless transmission means 55 to a receiving unit (not shown) on the vehicle body side, and is used for controlling the antilock brake device.

[0003]

The above conventional bearing device for a wheel with a generator utilizes a seal member 51A for sealing the end opening of the bearing annular space, and a multi-pole magnet 54 is provided in the seal slinger 54 to generate electricity. By providing the machine 44, downsizing is achieved. However, the sealing member 51
Separately from A, a sealing member 56 for sealing the generator 44
And a double sealing member is required. Therefore, the number of parts is increased and the cost is increased. Also the generator 44
The seal member 56 for sealing the
It is not possible to have a structure with reliable sealing performance. That is, the seal member 51A in the bearing space can have a high sealing performance having a large number of seal lips, but the seal member 56 for the generator 44 has a seal structure having such a large number of seal lips. I can't. Therefore, a material having high water resistance must be used for the magnetic ring 52 and the multi-pole magnet 54 constituting the generator 44, and there is a problem that power generation performance and cost are limited.

An object of the present invention is to eliminate the need for a contact seal, reduce the cost by reducing the number of parts, and to reliably seal the bearing internal space and the generator, and use a material with low water resistance for the generator. It is to provide a bearing device for a wheel with a generator that can do the above.

[0005]

In order to solve the above-mentioned problems, a bearing device for a wheel with a generator according to the present invention has an outer member having a double row rolling contact surface on the inner periphery thereof, and these rolling contact surfaces. In a wheel bearing device for rotatably supporting a wheel with respect to a vehicle body, the wheel includes an inner member having rolling surfaces facing each other and a double row rolling element accommodated between the rolling surfaces. Attach a cover to the outer member to cover the entire end of the bearing device for
Inside the cover, a generator for generating power by relative rotation of the outer member and the inner member is arranged. According to this configuration, since the cover that covers the entire end portion of the wheel bearing device is provided, it is possible to reliably seal both the internal space of the bearing and the generator without providing a seal member having a plurality of seal lips. it can. That is, since the cover is attached to the outer member, it suffices to seal the cover at a fixed attachment portion where relative rotation does not occur, and reliable sealing can be easily performed. Therefore, the cost for sealing is low. In addition, since the cover ensures a reliable seal and the generator is arranged inside the cover, a material having low water resistance can be used for the components of the generator. Therefore, it is possible to improve the power generation performance by using a magnetically excellent material, and to reduce the cost by using an inexpensive material. Although there is a cover, the conventional seal member at the end of the annular space can be omitted. Therefore, if the space is used as a space for disposing the generator, it is possible to achieve compactness. The generator-equipped wheel bearing device of the present invention is used to support the driven wheels because the cover for covering the entire end portion is provided.

In the present invention, the generator may be composed of a multi-pole magnet having magnetic poles arranged in a circumferential direction and a magnetic ring which houses the coil and faces the multi-pole magnet. . With such a configuration, power generation can be performed in a small size with high efficiency, and when used for detecting the wheel rotation speed, highly accurate detection can be performed due to the multipolarity.

In the present invention, the multi-pole magnet may be attached to the inner member and the magnetic ring may be attached to the inner surface of the cover. By attaching the magnetic ring to the cover in this manner, the magnetic ring can be attached at the same time as attaching the cover, and the assemblability is good.

When the magnetic ring is attached to the cover as described above, the cover has a cylindrical fitting portion that fits on the inner diameter surface of the outer member, and the magnetic member is attached to the inner diameter surface of the cylindrical fitting portion. The body ring may be attached. By fitting the cylindrical fitting portion to the outer member, coaxiality of the magnetic ring with respect to the multi-pole magnet is improved, and variation in air gap is suppressed.

Further, the present invention may have a sensor using the power generated by the generator as a power source.
When the sensor is provided separately from the generator in this way, it becomes possible to detect rotation at an extremely low speed which cannot be detected when the power generation output of the generator is used as a detection signal of the wheel rotation speed. Since the generator is used as the power source of the sensor, it is not necessary to route the power wiring of the sensor from the vehicle body.

Further, according to the present invention, there is provided wireless transmission means for wirelessly transmitting at least one of a wheel rotation speed signal output from the generator and a signal from a sensor operating with power generated by the generator. The transmitting means may use the generated power of the generator as a power source. With this configuration, the wheel rotation speed signal can be wirelessly transmitted to the outside of the bearing device without separately providing a power source for the wireless transmission means. Therefore, the wiring between the wheel bearing device and the vehicle body can be eliminated altogether, and the problem of wire disconnection due to stone bounce or the like is solved.

When the wireless transmission means is provided, an antenna for transmitting the output signal of the wireless transmission means is used.
It may be embedded in the cover. With this configuration, it is not necessary to provide a component for fixing the transmitting antenna or a case for the antenna, the number of components and the number of assembly steps are reduced, and the antenna does not project to the outside, resulting in a compact configuration. .

[0012]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. This embodiment is an inner ring rotating type of the third generation and is an example applied to a bearing device for supporting a driven wheel. This bearing device for a wheel with a generator has an outer member 1 having double rows of rolling surfaces 6 and 7 on the inner circumference, and an inner member having rolling surfaces 8 and 9 facing these rolling surfaces 6 and 7, respectively. A square member 2 and a double row rolling element 3 accommodated between the rolling surfaces 6 and 8 and between the rolling surfaces 7 and 9. The outer member 1 is
It has a vehicle body mounting flange 1a at one end and is mounted on the vehicle body via this vehicle body mounting flange 1a. The inner member 2 is
It has a wheel mounting flange 2a, and this wheel mounting flange 2
Wheels (not shown) are attached to a by bolts 14. This wheel bearing device is a double-row angular contact ball bearing,
The contact angles of the rolling surfaces 6 to 9 are formed so as to be back-to-back. The rolling elements 3 are held by the cage 10 for each row. An annular space between the outer member 1 and the inner member 2 is sealed by a seal member 11 on the outer side of the rolling element 3 on the outer side.

The inner member 2 is formed by integrally combining a hub wheel 2A integrally having a wheel mounting flange 2a and another inner ring constituent member 2B by plastic coupling such as caulking. And each of the inner ring constituent members 2B,
Of the double row rolling surfaces 8 and 9, the rolling surfaces 8 and 9 of each row are formed. Since the hub wheel 2A is for a driven wheel, it has a shape having no inner diameter hole. The outer member 1 includes a cover 1 that covers the entire inner end of the bearing device for a wheel.
2 is attached. Inside the cover 12, a generator 4 that generates electric power by the relative rotation of the outer member 1 and the inner member 2 is arranged. The cover 12 prevents water and dust from entering the bearing device from the outside. Cover 1
As the material of 2, it is preferable to use a metal subjected to anticorrosion treatment, a metal that does not rust such as stainless steel, or a synthetic resin. This wheel bearing device is for supporting the driven wheels and, unlike the wheel bearing device for the drive wheels, is not connected to the constant velocity joint or the like, so that the cover 12 does not interfere with other members.

As shown in FIG. 2, the cover 12 is formed by forming a stepped cylindrical portion on the outer circumference of a disk-shaped end surface portion 12d. This stepped cylindrical portion is the cylindrical fitting portion 1
It has 2a and a flange 12b projecting to the outer diameter side from the cylindrical fitting portion 12a. The cylindrical fitting portion 12a
A small diameter portion 12c having a smaller diameter than that of the flange portion 12b is provided following the flange portion 12b, and the small diameter portion 12c continues to the end surface portion 12d. The cover 12 is attached to the outer member 1 by fitting the cylindrical fitting portion 12 a to the inner diameter surface of the outer member 1 and pressing the flange portion 12 b against the end surface of the outer member 1. This attachment work is performed by pushing the collar portion 12b in the axial direction with a jig (not shown). The side surface of the cover collar 12b is
It is a flat surface so as to be in close contact with the end surface of the outer member 1. The cover 12 may be fitted to the outer diameter surface of the outer member 1.

The generator 4 is installed inside the cover 12 in an annular space between the outer member 1 and the inner member 2. The generator 4 has a front view as shown in FIG.
A ring-shaped multi-pole magnet 15 in which a large number of magnetic poles N and S are arranged in the circumferential direction, and a magnetic ring 1 in which a coil 17 is housed.
6 and 6. The magnetic ring 16 is a multi-pole magnet 15
It is of a radial type that is disposed on the outer peripheral side of and faces the multipolar magnet 15. A part of the magnetic ring 16 in the axial direction fits on the inner diameter surface of the cylindrical fitting portion 12 a of the cover 12, and another part of the magnetic ring 16 fits on the inner diameter surface of the outer member 1. That is, the magnetic body ring 16 has an outer diameter surface having a stepped cylindrical surface shape including a small diameter portion 16a and a large diameter portion 16b, and is fitted to the inner diameter surface of the outer member 1 at the small diameter portion 16a to have a large diameter. The portion 16b is fitted to the inner diameter surface of the cylindrical fitting portion 12a of the cover 12. Thereby, the coaxiality of the magnetic ring 16 with respect to the bearing device can be improved. The magnetic ring 16 has a small diameter portion 16
By fitting the inner surface of the outer member 1 at a, the coaxiality with the bearing device can be further improved. In this embodiment, the magnetic ring 16 serves as the stator of the generator 4.

The magnetic ring 16 is of a claw pole type. Specifically, as shown in the cross-sectional view in FIG.
The magnetic body ring 16 is composed of two magnetic body ring members 18a and 18b each having a groove-shaped cross-section that opens in the axial direction.
With their openings facing each other so that the outer diameter portions 18aa, 18ba of both members 18a, 18b
(FIG. 2) are fitted so that there are no gaps therebetween, thereby forming a ring body having a substantially rectangular cross section. As described above, by forming no gap between the fitting portions of the magnetic body ring members 18a and 18b, the magnetic resistance at the fitting portion in the magnetic circuit inside the magnetic body ring 16 can be suppressed to be small. Comb-shaped claws 19a and 19b extending axially opposite to each other are formed on the inner peripheral portions of the magnetic ring members 18a and 18b facing the multipolar magnet 15, respectively.
The two sets of claws 19a and 19b are alternately arranged in the circumferential direction with a gap therebetween. As shown in FIG. 2, a gap between the inner surface of the magnetic ring 16 and the coil 17 is filled with an elastic member 20 such as an elastic adhesive, which electrically insulates the magnetic ring 16 from the coil 17. Also, the relative vibration is suppressed. Further, the filling of the elastic member 20 is
It also has an effect of buffering the force generated when the magnetic body ring 16 is press-fitted into the outer member 1 and preventing the force from affecting the internal coil 17 or the like.

As shown in FIG. 2, the multi-pole magnet 15 is composed of a multi-pole magnet member 21 and an annular core metal 22. The cored bar 22 is a stepped cylindrical member including a large diameter portion 22a and a small diameter portion 22b, and a magnet member 21, which is, for example, a rubber magnet, is vulcanized and adhered to the outer periphery of the small diameter portion 22b. In addition to this, the magnet member 21 may be a plastic magnet or a sintered alloy. The cored bar 22 is preferably formed of a magnetic material, particularly a ferromagnetic material. The annular core metal 22 has a large diameter portion 22a.
Is fitted and fixed to the outer diameter surface of the inner member 2 in an interference fit state. The end portion of the inner member 2 has a small diameter portion 2b having a step from the fitting portion of the core metal large diameter portion 22a so that the core metal small diameter portion 22b can be inserted when the core metal 22 is fitted.
It is said that. In this way, the small diameter portion 2 is attached to the end of the inner member 2.
By forming b, the generator 4 can be easily installed at the end of the bearing device that has no space in space. In this embodiment, the multipole magnet 15 is the rotor of the generator 4.

Further, as shown in FIG.
An annular wireless transmission means 2 for wirelessly transmitting the power generation output of the generator 4 as a wheel rotation speed signal to the step portion 23 extending from the flange portion 12b of the outer diameter surface to the small diameter portion 12c.
4 are installed. The wireless transmission means 24 is installed on the cover 12 by, for example, welding or caulking with caulking pins. The step portion 23 of the cover 12 is located at a position aligned with the magnetic ring 16 in the axial direction. From the side surface portion 16d of the magnetic ring 16 facing the cover 12 side to the cover 12
A lead wire from one end face of the coil 17 is drawn and connected to the one end face side of the wireless transmission means 24 facing the magnetic body ring 16 via a wiring hole 25 penetrating in the axial direction. A portion of the wiring hole 25, which is a connection portion between the coil 17 and the wireless transmission means 24, is sealed with a resin mold or the like in order to prevent water from entering the inside of the cover 12 from here.

The wireless transmission means 24, for example, as shown in the block diagram of FIG. 4, a signal processing circuit 27 for processing the power generation output of the generator 4 and taking it out as a wheel rotation speed signal,
A transmission circuit 28 that wirelessly transmits the wheel rotation speed signal processed by this circuit as radio waves, and a power supply circuit 29 that rectifies the power generation output of the generator 4 and supplies it as a power source for the signal processing circuit 27 and the transmission circuit 28 are provided. ing. The transmission circuit 28 includes an oscillation / modulation circuit and is connected to the transmission antenna 30. The wheel rotation speed signal transmitted from the transmission circuit 28 as a radio wave from the transmission antenna 30 is received by the vehicle-side reception unit 33 including the reception antenna 31 and the reception circuit 32. The receiving circuit 32 includes a tuning / demodulating circuit that tunes and demodulates a received signal. Even when a sensor for detecting the number of rotations of the wheel is installed in the bearing device or in the vicinity thereof in addition to the generator 4, the same wireless transmission means 24 is used, and the power output of the generator 4 is used as the power source. can do. In this case, it is possible to detect rotation at an extremely low speed, which cannot be detected when the power generation output of the generator 4 is used as a wheel rotation speed detection signal.

The operation of the above configuration will be described. When the inner member 2 of the generator 4 in which the multi-pole magnet 15 is installed rotates together with the wheel, the magnetic flux 16 associated with the outer member 1 facing the outer ring 1 is taken out as electric power by the change in the interlinking magnetic flux. The power generation output extracted by the generator 4 is input to the wireless transmission unit 24 and wirelessly transmitted as a wheel rotation speed signal by radio waves. That is, the power generation output is processed as a wheel rotation speed signal by the signal processing circuit 27, and the signal is transmitted from the transmission circuit 28 to the reception unit 33 as a radio wave via the transmission antenna 30. The power generation output of the generator 4 is also input to the power supply circuit 29, rectified and smoothed, and supplied as the power supply of the signal processing circuit 27 and the transmission circuit 28. In this way, the wheel rotation speed signal can be wirelessly transmitted to the outside of the bearing device without providing a special power source for the wireless transmission means 24.

This bearing device for a wheel with a generator is for supporting the driven wheel, and the cover 1 covers the entire end portion on the inner side thereof.
Since 2 is attached to the outer member 1 and the generator 4 is arranged inside the cover 12, both the inner space of the bearing and the generator 4 are provided without providing a seal member having a plurality of seal lips. It can be surely sealed. That is, since the cover 12 is attached to the outer member 1, it may be sealed with a fixed attachment portion that does not cause relative rotation.
Easy and reliable sealing. Therefore, the cost for sealing is low. In addition, since the cover 12 can perform a reliable seal and the generator 4 is arranged inside the cover 12 as described above, the multi-pole magnet 15 and the magnetic ring 16 which are components of the generator 4 are water-resistant (rust-proof). ) Low materials can be used. Therefore, it is possible to improve the power generation performance by using a magnetically excellent material, and to reduce the cost by using an inexpensive material. There is a cover 12,
Since the conventional seal member at the end of the annular space can be omitted, the space can be used as the space for disposing the generator 4 and the structure can be made compact.

The generator 4 is composed of a multi-pole magnet 15 in which magnetic poles N and S are arranged in the circumferential direction, and a magnetic ring 16 which houses the coil 17 and faces the multi-pole magnet 15. The wheel rotation speed can be detected accurately by
In addition, it is compact and enables efficient power generation.

FIG. 5 shows another embodiment of the present invention.
In this embodiment, in the first embodiment shown in FIGS. 1 to 4, a part of the electric circuit 34 in the wireless transmission means 24 provided outside the cover 12 is replaced with the magnetic ring 16.
It is provided inside. As a part of this electric circuit 34,
The power supply circuit 29 and the signal processing circuit 27 (FIG. 4) that do not require adjustment may be selected, or all circuits other than the transmission antenna 30 may be selected. Here, the partial electric circuit 34
Are installed at positions axially adjacent to the wireless transmission means 24. As a result, the coil 17 and the partial circuit 34 are directly electrically connected in the magnetic ring 16. Further, the partial circuit 34 and the wireless transmission means 24 are electrically connected as in the first embodiment. That is, the lead wire from the partial circuit 34 is directed to the wireless transmission means 24 side through the wiring hole 25 penetrating in the axial direction from the one side surface portion 16d of the magnetic body ring 16 to the installation portion of the wireless transmission means 24 of the cover 12. By pulling in, it is electrically connected. The sealing of the portion of the wiring hole 25 with a resin mold or the like, and other configurations are the same as in the first embodiment.

FIG. 6 shows still another embodiment of the present invention. In this embodiment, in the second embodiment shown in FIG. 5, the wireless transmission means 24 has a box shape and is installed outside the cover end face portion 12d. Therefore, the axial length of the small diameter portion 12c of the cover 12 is shorter than that of the first embodiment. The installation position may be any position as long as it is on the inner diameter side of the outer diameter of the outer member 1. Here, the wireless transmission means 24 is installed at a position deviated to the inner diameter side from the position adjacent to the magnetic ring 16. Therefore, a part of the electric circuit 3 in the magnetic ring 16
4, a lead wire 26 that is led out in the axial direction through a wiring hole 25 provided in one side surface portion 16d of the magnetic ring 16.
Is arranged along the inner side surface of the cover end face portion 12d so that the cover end face portion 12d is pulled into the wireless transmission means 24 through the wiring hole 35 provided in the installation portion of the wireless transmission means 24. In this way, by pulling out the lead wire 26 from the magnetic ring 16 in the axial direction, it becomes easy to incorporate the generator 4 into the bearing device. Further, in order to prevent disconnection of the lead wire 26, the wiring portion of the lead wire 26 is molded with resin or the like on the inner side surface of the cover end face portion 12d. Other configurations are the same as those in the first embodiment.

FIG. 7 shows still another embodiment of the present invention. In this embodiment, the transmission antenna 30 is covered 12
The circuit 37 for transmission is housed in the magnetic ring 16 while being integrally molded therein. In this embodiment, FIG.
In the second embodiment shown in (1), the cover 12 is made of resin, and the entire electric circuit 37 of the wireless transmission means 24 is provided inside the magnetic ring 16. The transmitting antenna 30 is axially projected from the one side surface portion 16d of the magnetic body ring 16 toward the cover 12 side, and the transmitting antenna 30 is embedded in the cover end surface portion 12d. Here, the cover 12 is a stepped cylindrical outer diameter surface having a cylindrical fitting portion 12a that fits on the inner diameter surface of the outer member 1 and a flange portion 12b that contacts the end surface of the outer member 1. The end portion on the flange portion 12b side is closed by the end surface portion 12d, and the small diameter portion 12c as in the case of the first embodiment.
Is omitted. The magnetic ring 16 is insert-molded in the cover 12 by disposing the magnetic ring 16 on the inner diameter side of the cover fitting portion 12a when the resin cover 12 is molded, whereby the transmission antenna 30 is embedded in the cover end surface portion 12d. As described above, when the cylindrical fitting portion 12a of the cover 12 formed integrally with the magnetic body ring 16 is fitted to the inner diameter surface of the outer member 1, a part of the outer diameter surface of the magnetic body ring 16 is removed. It fits on the inner diameter surface of the square member 1. Other configurations are first
Is the same as the embodiment of.

In the case of this embodiment, since the transmitting antenna 30 is integrally formed with the cover 12 and the transmitting circuit 37 is arranged in the magnetic ring 16 of the generator 4, the transmitting antenna of the wireless transmitting means 24 is provided. It is not necessary to provide parts such as a case for fixing 30 to the cover end face portion 12d. Therefore, the number of parts can be reduced and the number of assembling steps can be reduced.

FIG. 8 shows still another embodiment of the present invention. In this embodiment, the magnetic ring 16 is provided on the inner side surface of the cover end face portion 12d in the first embodiment, and the multi-pole magnet 15 is arranged on the outer diameter side of the magnetic ring 16. Comb-shaped claws 19a, 1 of the magnetic ring 16
9b is formed on the outer diameter surface facing the multipolar magnet 15. An inward small diameter portion 12e that is recessed toward the bearing end side is formed coaxially with the cover fitting portion 12a on the end surface portion 12d of the cover 12, and the magnetic ring 16 is formed on the outer diameter surface of the inward small diameter portion 12e. By fitting a part of the inner diameter surface of
A magnetic ring 16 is provided on the inner side surface of the cover end face portion 12d. The wireless transmission means 24 is provided at a position adjacent to the magnetic body ring 16 on the outer surface of the cover end surface portion 12d, and extends from one side surface portion 16d of the magnetic body ring 16 facing the cover end surface portion 12d to the cover end surface portion 12d in the axial direction. A lead wire from the coil 17 in the magnetic body ring 16 is drawn in through the wiring hole 25 penetrating to the wireless transmission means 24. Multi-pole magnet 1
The core metal 22 of 5 is a stepped cylindrical member having a small diameter portion 22c and a large diameter portion 22d, and the inner diameter surface of the large diameter portion 22d is
For example, the magnet member 21 made of a rubber magnet is vulcanized and adhered. The small diameter portion 22c of the cored bar 22 is fitted and fixed to the outer diameter surface of the inner member 2 in an interference fit state. The end of the inner member 2 is formed as a small diameter portion 2b having a step from a portion where the core metal small diameter portion 22c is fitted so that the magnetic ring 16 provided on the cover 12 can be inserted. Thus, the inner member 2
By forming the small-diameter portion 2b at the end of the generator, the generator 4 can be easily installed at the end of the bearing device that has no spatial allowance. Since the small diameter portion 2b of the inner member 2 does not fit the magnetic ring 16, it can be formed by an inexpensive process such as cutting. In order to prevent the magnetic ring 16 from interfering with the inner member 2, instead of forming the small-diameter portion 2b on the inner member 2, the cover end face portion 12d is projected to the inner side, and Body ring 16 to inner member 2
It may be separated from the end face in the axial direction. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, since the magnetic ring 16 is provided on the inner side surface of the cover end face portion 12d, it is located between the magnetic ring 16 and the outer member 1, that is, to the outer diameter side of the magnetic ring 16. The multi-pole magnet 15 can be arranged and the multi-pole magnet 15 can be arranged.
The diameter can be made larger, and the magnetic pole pitch of the multi-pole magnet 15 can be made larger than that in each of the above-described embodiments to improve the power generation capacity.

FIG. 9 shows still another embodiment of the present invention. In this embodiment, the wireless transmission means 2 is provided inside the magnetic ring 16 in the embodiment shown in FIG.
4 is provided with a part of the electric circuit 34. The partial circuit 34 includes the coil 1 inside the magnetic ring 16.
7 directly connected. Further, the partial circuit 34 and the wireless transmission means 24 are disposed from the one side surface portion 16 d facing the cover end surface portion 12 d of the magnetic ring 16 to the cover end surface portion 12.
via the wiring hole 25 penetrating in the axial direction over d,
The lead wire from the partial circuit 34 is connected to the wireless transmission means 2
It is electrically connected by pulling it to the 4 side. Other configurations are the same as those of the embodiment shown in FIG.

FIG. 10 shows still another embodiment of the present invention. In this embodiment, the generator 4 in the first embodiment is an axial type in which the multi-pole magnet 15 and the magnetic ring 16 face each other in the axial direction. The comb-shaped claws 19a and 19b of the magnetic ring 16 are formed on the side surface portion 16c facing the multipolar magnet 15. Multi-pole magnet 15
Is a core member 22 having a cylindrical portion 22e and a rising portion 22f and having an L-shaped cross section, in which a magnet member 21 is attached to the rising portion 22f. The multipole magnet 15 is press-fitted into the outer diameter surface of the inner member 2 by the cylindrical portion 22e with the rising portion 22f directed inward in the axial direction, and the magnet member 21 is attached to the inner side surface portion 16c of the magnetic ring 16. Face to face. Also in this embodiment, the end portion of the inner member 2 is formed in the small diameter portion 2b, so that the installation space for the generator 4 is secured. In addition, there is an inward-facing flange portion 22g formed by bending at the portion of the cored bar 22 of the multipolar magnet 15 that moves from the cylindrical portion 22e to the rising portion 22f. This inward flange portion 22g is the cylindrical portion 2
When 2e is press-fitted into the outer diameter surface of the inner member 2, a step portion that changes from the inner member small-diameter portion 2b to the outer diameter into which the cylindrical portion 22e is press-fitted is brought into contact, and the multipolar magnet 15 is axially positioned. It Other configurations are the same as those in the first embodiment.

FIG. 11 shows still another embodiment of the present invention. In this embodiment, in the embodiment shown in FIG. 10, a part of the electric circuit 34 of the wireless transmission means 24 is arranged inside the magnetic ring 16 at a position axially adjacent to the wireless transmission means 24. Magnetic ring 16
Inside, the coil 17 and the partial circuit 34 are electrically connected directly. The partial circuit 34 and the wireless transmission means 24 are electrically connected as follows. One side surface portion 1 facing the cover end surface portion 12d of the magnetic ring 16.
There is a wiring hole 25 penetrating in the axial direction from 6d to the cover end face portion 12d, and a lead wire from one circuit 34 is drawn to the wireless transmission means 24 side through this wiring hole 25, and the wireless transmission means 24 is electrically connected to the wireless transmission means 24. Connected. The other structure is the same as that of the embodiment of FIG.

[0032]

According to the bearing device for a wheel with a generator of the present invention, a cover for covering the entire end portion of the bearing device for a wheel is attached to an outer member, and the outer member and the inner member are provided inside the cover. Since a generator that generates electricity by relative rotation is arranged,
By eliminating the need for contact seals, costs can be reduced by reducing the number of parts. In addition, since the bearing inner space and the generator can be reliably sealed, it is possible to use a material having low water resistance for the generator, so that the power generation performance can be improved and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a wheel bearing device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the generator.

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

FIG. 4 is a block diagram showing a configuration of a generator and wireless transmission means.

FIG. 5 is a sectional view of a power generator according to another embodiment of the present invention.

FIG. 6 is a sectional view of a power generator according to still another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a generator according to still another embodiment of the present invention.

FIG. 8 is a sectional view of a generator according to still another embodiment of the present invention.

FIG. 9 is a sectional view of a power generator according to still another embodiment of the present invention.

FIG. 10 is a sectional view of a generator according to still another embodiment of the present invention.

FIG. 11 is a sectional view of a power generator according to still another embodiment of the present invention.

FIG. 12 is a sectional view of a conventional example.

[Explanation of symbols]

1 ... Outer member 2 ... Inner member 3 ... rolling elements 4 ... Generator 6-9 ... Rolling surface 12 ... Cover 12a ... Cylindrical fitting part 15 ... Multi-pole magnet 16 ... Magnetic ring 17 ... Coil 24 ... Wireless transmission means 30 ... Transmission antenna

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01D 5/242 G01D 5/242 A 5H622 G08C 17/02 H02K 1/27 501A H02K 1/27 501 G08C 17 / 00 B (72) Inventor Takayuki Norimatsu 1578 Higashi-Kaizuka, Iwata-shi, Shizuoka Inside NTN Corporation (72) Inventor Eiji Tajima 1578 Higashi-Kaizuka, Iwata-shi, Shizuoka F-Term (Reference) 2F073 AA35 AB07 BB02 BC02 CC01 DD02 EE12 FF02 GG04 2F077 AA25 AA41 AA43 CC02 FF36 VV02 VV03 3D046 BB12 BB28 HH36 3J016 AA02 AA03 BA01 CA08 3J101 AA02 AA32 AA43 AA54 AA62 BA77 FA23 GA02 GA03 5H622 CA05 CA07 DD

Claims (7)

[Claims] 1. 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 double row accommodated between both rolling contact surfaces. In a bearing device for a wheel, which includes a rolling element and which rotatably supports a wheel with respect to a vehicle body, a cover that covers the entire end of the wheel bearing device is attached to an outer member, and the inside and outside of the cover are attached to the outer member. A bearing device for a wheel with a generator, characterized in that a generator for generating electric power is arranged by relative rotation of the inner member and the inner member. 2. The generator according to claim 1, wherein the generator is composed of a multi-pole magnet having magnetic poles arranged in a circumferential direction and a magnetic ring that houses the coil and faces the multi-pole magnet. Bearing device for generator with wheels. 3. The multi-pole magnet is attached to an inner member,
The bearing device for a wheel with a generator according to claim 2, wherein the magnetic ring is attached to an inner surface of the cover. 4. The cover according to claim 3, wherein the cover has a cylindrical fitting portion that fits on the inner diameter surface of the outer member, and the magnetic ring is attached to the inner diameter surface of the cylindrical fitting portion. Bearing device for generator with wheels. 5. The bearing device for a wheel with a generator according to any one of claims 1 to 4, further comprising a sensor using a power generated by the generator as a power source. 6. A wheel speed signal output from the generator,
And wireless transmission means for wirelessly transmitting at least one of the signals of the sensor operating with the power generated by the generator, and the wireless transmission means uses the power generated by the generator as a power source. The bearing device for wheels with a generator according to claim 5. 7. The bearing device for a wheel with a generator according to claim 6, wherein the antenna for transmitting the output signal of the wireless transmission means is provided in a state of being embedded in the cover.