JP4040331B2 - Wheel bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to the detection and wheel support bearing assembly equipped with a rotation detection equipment to transmit wirelessly a rotational speed of a wheel or the like.
[0002]
[Prior art]
As a rotational speed detection device including a generator and a wireless transmission means, there is a device including a generator including a magnetic ring containing a coil and a multipolar magnet. In this generator, the magnetic ring is provided on one of the fixed member and the rotating member, the multi-pole magnet is provided on the other member, and power is generated by relative rotation between the fixed member and the rotating member. The rotational speed signal output from the generator is transmitted by the wireless transmission means.
[0003]
The generator includes a multipolar magnet and a magnetic ring disposed between double-row transfer surfaces formed on a fixed member and a rotary member, and is provided between the double-row transfer surfaces. In addition to this, there is a structure in which a sealing member that seals the gap between the fixed member and the rotating member and a multipolar magnet are integrated, and the multipolar magnet and the magnetic ring are disposed outside the seal.
[0004]
In generators with a structure in which a multi-pole magnet and a magnetic ring are arranged outside the seal, the multi-pole magnet is exposed to the muddy salt water. Is required. Further, when the magnetic ring is also vulnerable to muddy salt water, it is necessary to carry out rust prevention treatment. Rust prevention treatment for magnets and magnetic rings includes plating with zinc or nickel on the surface of magnets and magnetic rings, application of anticorrosion paint, molding with resin materials for magnets and magnetic rings, etc. It has been broken.
[0005]
[Problems to be solved by the invention]
In the rust prevention treatment for mud salt water or the like, it is necessary to increase the film thickness of plating or paint. The mold thickness of the resin mold is generally larger than plating or painting. When the rust-proofing treatment is performed on the opposing surface of the magnet and the magnetic ring, particularly the magnet of the magnetic ring, the gap between the magnet and the magnetic ring becomes large, and the generated voltage decreases. There are methods to increase the number of turns of the coil housed in the magnetic ring and to increase the thickness of the magnet in order to prevent a decrease in the generated voltage. There is.
[0006]
When foreign matter enters the opposing surface of the magnetic ring and the magnet, the foreign matter may damage the surface of the magnet and the magnetic ring, damage the rust preventive film or the molding material, and rust may be generated therefrom. For this reason, it is necessary to further provide a seal for preventing entry of foreign matter.
[0007]
An object of the present invention is to provide a wheel bearing equipped with a rotation detection device that has a function of transmitting a rotation detection signal wirelessly but does not require a rust prevention treatment for a multi-pole magnet and a magnetic ring, and can have a compact configuration. Is to provide a device.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, a wheel bearing device of the present invention includes a rotating member that is rotatably supported by a fixed member, a generator that generates electric power by relative rotation of the fixed member and the rotating member, and an output of the generator A transmission means for wirelessly transmitting at least a rotation speed signal among a rotation speed signal to be transmitted and an output signal of a sensor that operates using power generated by the generator as a power source, and a seal that seals a gap between the fixed member and the rotation member An outer member having a double-row rolling surface on the inner periphery and a flange on the outer periphery, and a knuckle to which the outer member is attached via the flange. The rotating member has an inner member having a rolling surface that faces each of the rolling surfaces of the outer member, and the cup portion is fixed to the inner member and the cup portion is aligned with the inner member in the axial direction. With the outer ring of the universal joint A wheel bearing device comprising, are the following configuration.
The outer member is located at a position where the end surface on the cup portion side of the constant velocity universal joint is retracted inward in the axial direction from the end surface of the inner member, and the generator has magnetic poles arranged in a circumferential direction. A multi-pole magnet and a magnetic ring that accommodates the coil and faces the multi-pole magnet, and the multi-pole magnet is fixed to the outer periphery of the inner member, and the magnetic ring has an outer diameter The magnetic ring is formed by a stepped cylindrical surface having a small diameter portion and a large diameter portion, and is fitted to the inner diameter surface of the outer member on the cup portion side at the small diameter portion. Is partially protruded outward in the axial direction, which is closer to the cup portion than the end surface of the inner member, and the wireless transmission means is formed in an annular shape and is positioned adjacent to the axially outer side of the magnetic ring. And fixed to the magnetic ring integrally with the magnetic body ring. The inner diameter surface of the groove has a stepped shape that forms a concave corner portion at the end on the cup portion side, and the seal member is fitted to the corner portion, and the seal lip of the seal member is used as the rotating member. This seal contact portion is formed by a slinger fitted to the outer periphery of the cup portion of the constant velocity universal joint, and is connected to the magnetic ring of the generator inside the seal member. Ru is opposed pole magnet. The magnetic ring includes a pair of ferromagnetic rings facing each other, the pair of ferromagnetic rings are fitted to each other at the outermost peripheral portion, and are bent in opposite directions to the facing portion with the multipolar magnet. A plurality of comb-like claws are formed, and the comb-like claws of the two ferromagnetic rings are alternately arranged in the circumferential direction at intervals. The multi-pole magnet and magnetic ring, even those facing in the radial direction, or may be facing in the axial direction.
[0010]
According to the above configuration, the opposing portion of the magnetic ring and the multipolar magnet is located inside the seal member, and the intrusion of the muddy salt water is prevented by the seal member. There is no need to do it. For this reason, a magnet can be manufactured cheaply, the gap between the magnetic body ring of a generator and a magnet can be made small, and a generator can be reduced in size. Further, the generator can be further reduced in size by forming the magnetic ring from a steel material having a high magnetic permeability and no rust prevention. Further, since the seal member does not need to be fitted to the fixing member, it is not necessary to provide a seal fitting portion on the fixing member, and the fixing member can be made small. Therefore, Ru can be extended space for mounting a generator and transmitter.
[0011]
The present invention smell Te, the inner diameter surface of the magnetic material element ring, to form a engaged portion which comprises a projection or recess may be engaged with the engaging portion of the sealing member. The engaged portion and the engaging portion may extend over the entire circumference in the circumferential direction, or may be provided locally at one or a plurality of locations in the circumferential direction.
If thus provided engaged portion and the engagement portion, the seal member can be prevented from escaping from the fitting match that magnetics ring. For example, the engaged portion and the engaging portion may have a small resistance due to engagement on the deeper fitting side of the seal member and a larger resistance on the removal side, such as a check claw.
[0012]
In the present invention, the multipolar magnet may be composed of an annular cored bar and a magnet member fixed to the cored bar, and the slinger may be formed integrally with the cored bar of the multipolar magnet.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 relates to a first embodiment of the present invention and shows a wheel bearing device equipped with a rotation detection device. The fixing member 1 of the wheel bearing device includes an outer member 2 and a knuckle 10. The outer member 2 is attached to the knuckle 10 via the flange 2a. The knuckle 10 is fixed to the vehicle body. The rotating member 7 includes an inner member 3 and an outer ring 15a of a constant velocity universal joint 15 fixed to the inner diameter surface thereof. The outer member 2 has double-row rolling surfaces 5 a and 5 b on the inner periphery, and the rolling surfaces 6 a and 6 b facing the rolling surfaces 5 a and 5 b are provided on the outer periphery of the inner member 3. Yes. The double row rolling elements 4 are accommodated between the rolling surfaces 5a and 6a and between the rolling surfaces 5b and 6b. The rolling elements 4 are held by a cage 8 for each row. The outer member 2, the inner member 3, the rolling element 4 and the cage 8 constitute a rolling bearing, and the outer member 2 and the inner member 3 serve as raceways. An annular space between the outer member 2 and the inner member 3 is sealed by a seal member 9 on the outer side of the outer rolling element 4.
[0017]
The generator 11 is provided with a multipolar magnet 13 facing the inner peripheral side of a magnetic ring 12 with a built-in coil. The magnetic ring 12 has a cylindrical surface shape with a stepped outer surface having a small diameter portion and a large diameter portion, and is fitted to the inner diameter surface of the outer member 2 at the small diameter portion. That is, the magnetic body ring 12 is fitted and attached to the inner diameter surface of the outer member 2 at a part in the axial direction. In this embodiment, the magnetic ring 12 is a stator of the generator 11. The multipolar magnet 13 is magnetized in multiple poles so that the magnetic poles are arranged at equal intervals in the circumferential direction. The multipolar magnet 13 is attached to the inner member 3 and is a rotor of the generator 11 in this embodiment.
[0018]
As shown in FIG. 4, the magnetic ring 12 includes a pair of ferromagnetic rings 30a and 30b facing in the axial direction. The ferromagnetic rings 30a and 30b are annular members having the cross-sectional shape shown in FIG. At the other end of the ferromagnetic rings 30a and 30b, a plurality of comb-like claws 31a and 31b bent from the side surface portions 32 and 33 to the opposite side surface are formed. The comb-like claws 31a and 31b are alternately arranged in the circumferential direction at a predetermined interval. The comb-like claws 31a and 31b face the multipolar magnet 13 with a predetermined interval to form a claw-pole generator. The ferromagnetic rings 30a and 30b are made of a magnetic material having rust prevention properties such as ferritic stainless steel (JIS standard SUS430 or the like).
[0019]
As shown in FIG. 2, the multipolar magnet 13 is formed of a multipolar magnet member 16 and an annular cored bar 17. The magnet member 16 is, for example, a rubber magnet and is vulcanized and bonded to the core metal 17. When the core metal 17 is provided, the core metal 17 is preferably formed of a magnetic material, particularly a ferromagnetic material. The cored bar 17 may be an annular member having an L-shaped cross section, or an annular member having a concave-shaped cross section. The annular cored bar 17 is fitted and fixed to the outer diameter surface of the inner member 3 in an interference fit state. The multipolar magnet 13 may be formed of a plastic magnet or a sintered magnet, or may be attached to the outer diameter surface of the inner member 3 with an adhesive or the like. When the multipolar magnet 13 is a plastic magnet or a sintered magnet, the cored bar 17 is not necessarily provided.
[0020]
In this example, the wireless transmission means 14 is formed in an annular shape and is integrated with the magnetic ring 12. In other words, they are fixed together. The wireless transmission means 14 is located adjacent to the outside of the magnetic ring 12 in the axial direction. Inner and outer diameters of the wireless transmitting means 12 is approximately that match the inner and outer diameters of the axial outer end of the magnetic ring 12. Wa Iyaresu transmission means 14 consists of a transmitter which accommodates an electronic component and an antenna. The power for the wireless transmission means 14 is supplied from the generator 11. Some or all of the electronic components of the wireless transmission unit 14 may be incorporated in the magnetic ring 12 of the generator 11.
[0021]
The magnetic ring 12 has a stepped shape in which the shape of the inner diameter surface forms a concave corner portion by the side surface portion 33 and the inner diameter portion 34, and the seal member 18 is attached to the corner portion. The seal member 18 is formed by joining and integrating a seal 20 made of an elastic material to a core metal 19. The cored bar 19 has an L-shaped cross-sectional shape. The seal 20 has a lip. The number of lips may be arbitrary, but in the example shown in the figure, one radial lip 21 and two side lips 22 are provided.
[0022]
Opposite to the seal member 18, the rotating member 7 is provided with a slinger 23 serving as a seal contact portion. The slinger 23 is made of stainless steel. The slinger 23 is press-fitted into the shoulder portion of the cup portion 37 in the outer ring 15 a of the constant velocity universal joint 15. The slinger 23 has a cylindrical part 24 and an inclined collar part 25, the radial lip 21 of the seal member 18 is in sliding contact with the cylindrical part 24, and the side lips 22, 22 are in sliding contact with the inclined collar part 25. The seal contact portion where the radial lip 21 and the side lips 22, 22 are in sliding contact may be formed directly on the outer diameter surface of the cup portion 37 of the constant velocity universal joint 15, but the rust prevention capability of the seal contact portion is ensured and high to achieve the performance seal, in this invention, it uses a slinger 23 above follow.
[0023]
The seal member 18 is configured such that the outer peripheral surface of the cylindrical portion 19a of the core metal 19 is covered with the seal 20, and the cylindrical portion 19a is in a state where the side surface portion 19b is abutted against the side surface portion 33 of the magnetic body ring 12. 12 is press-fitted into the inner diameter surface 33. Engagement portions 27 made of depressions or protrusions are formed on the entire circumference or a plurality of locations in the circumferential direction at a portion 20 a that covers the outer diameter surface of the cylindrical portion 19 a of the core rod 19 of the seal 20. In the inner diameter portion 34 of the magnetic ring 12, an engaged portion 28 made of a depression or a protrusion is formed on the entire circumference or a plurality of locations in the circumferential direction. The sealing member 18 is attached to the magnetic ring 12 so that the engaged portion 28 of the magnetic ring 12 and the engaging portion 27 of the seal 20 are engaged with each other. The sealing member 18 may be mounted without forming the engaging portion 27 and the engaged portion 28. However, in order to prevent the sealing member 18 from coming off, the engaging portion 27 and the engaged portion 28 are used. It is desirable to form. The seal member 18 is configured such that the seal 20 does not cover the outer peripheral surface of the cylindrical portion 19a of the core metal 19 or covers only a part of the tip, and the side surface portion 19b is formed on the inner diameter portion 34 of the magnetic ring 12 The cylindrical portion 19a of the core metal 19 may be fitted so as to be in a state of being abutted against the side surface portion 33 of the ring 12.
[0024]
The outer side sealing member 9 and the inboard side sealing member 18 prevent intrusion of muddy salt water and the like from the outside of the vehicle. In particular, in the seal member 18, intrusion of muddy salt water and foreign matter is prevented by a high-performance seal composed of three seal lips of the side lips 22 and 22 and the radial lip 21. Since the magnet 13 of the generator 11 is disposed inside the high-performance seal, it is not exposed to foreign matter, muddy salt water, etc., and further seals for preventing rust prevention and entry of foreign matter are unnecessary. Can do.
[0025]
FIG. 5 shows a modification of the seal contact portion. In this example, the core bar 39 of the multipolar magnet 13 is formed integrally with the slinger 23. The slinger 23 is made of stainless steel. The slinger 23 has an intermediate step portion 40, a large diameter cylindrical portion 41, and an inclined rod 42 that is continuous with the large diameter cylindrical portion 41 in a small diameter cylindrical portion serving as a core metal 39. The tip of the inclined rod 42 rises on the outer diameter side. The slinger 23 is attached by press-fitting the large-diameter cylindrical portion 41 into the shoulder portion 43 of the cup portion 37 of the constant velocity universal joint 15. Instead of press-fitting the large-diameter cylindrical portion 41 into the cup portion 37 of the constant velocity universal joint 15, the metal core 39 may be attached by press-fitting into the inner member 3. Other configurations are the same as those of the first embodiment.
[0026]
FIG. 6 shows a proposed example . In this proposed example , a cylindrical protruding portion 12 a protruding in the axial direction is provided on the outer diameter portion of the ring member 12 of the generator 11, and the cylindrical protruding portion 12 a is press-fitted into the outer diameter surface of the outer member 2. Thus, the generator 11 is attached to the outer member 2. The cylindrical protrusion 12 a is formed of a part of the ferromagnetic ring that constitutes the magnetic ring 12. The inner side surface of the generator 11 is a flat surface without a step, and is brought into contact with the end surface of the outer member 2. Other configurations in the proposed example are the same as those in the first embodiment shown in FIG.
[0027]
FIG. 7 shows still another embodiment of the present invention. In this embodiment, the generator 11 is an axial type in which the multipolar magnet 13 and the magnetic ring 12 face each other in the axial direction. The multipolar magnet 18 is obtained by attaching the magnet member 16 to the rising portion 45 of the L-shaped cored bar 17 having the cylindrical portion 44 and the rising portion 45. The multipolar magnet 18 is press-fitted into the outer diameter surface of the inner member 3 at the cylindrical portion 44 with the rising portion 45 facing the inner side in the axial direction, and the magnet member 16 is the side surface on the inner side in the axial direction of the magnetic ring 12. Face to face. Other configurations in this embodiment are the same as those in the first embodiment shown in FIG.
[0028]
8 to 11 show another proposed example in which respectively is found. In each of these proposal examples , the wireless transmission means 14 is formed in an annular shape, the wireless transmission means 14 is disposed adjacent to the outside of the generator 11 in the axial direction with respect to the magnetic ring 12, and the inner diameter side of the wireless transmission means 14 is arranged. The seal member 18 is fitted to the above. In the embodiments of these drawings, the cross-sectional shape of the magnetic ring 12 and the mounting structure of the magnetic ring 12 and the wireless transmission means 14 are different from each other, but the other configurations are common.
[0029]
The common matter will be described. The magnetic ring 12 has a configuration as a claw-pole generator shown in FIG. 4 even if there is a slight difference in cross-sectional shape. The magnetic ring 12 has a pair of ferromagnetic rings 30a and 30b. The multipolar magnet 18, the slinger 23 serving as a seal contact portion, and the seal member 18 have the configurations described in the first embodiment.
The wireless transmission means 14 is obtained by mounting a wireless transmitter 38 containing electronic components and an antenna on the mounting ring 26. Some or all of the electronic components of the wireless transmitter 38 may be incorporated in the magnetic ring 12. The mounting ring 26 has a Z-shaped cross section, and has an inner peripheral cylindrical portion 26a, a side surface portion 26b, and an outer peripheral cylindrical portion 26c. For example, the mounting ring 26 is pressed together to form the above-described portions 26a to 26c. The wireless transmitter 38 is installed on the outer diameter surface of the inner peripheral cylindrical portion 26a.
The seal member 18 is configured so that the cylindrical portion 19a of the cored bar 19 does not cover the outer peripheral surface with the seal 20 or covers only a part of the tip. The seal member 18 is fitted to the inner peripheral cylindrical portion 26a of the mounting ring 26 so that the side surface portion 19b is in a state of being abutted against the side surface portion 33 of the magnetic ring 12.
[0030]
An engaged portion 28 made of a protrusion or a depression is formed on the inner diameter surface of the wireless transmission means 14, and the seal member 18 is engaged with the engaged portion 28 on the inner diameter surface of the wireless transmission means 14. The engaging portion 27 is formed, the engaged portion 28 and the engaging portion 27 are engaged, and the seal member 18 is fitted to the inner diameter surface of the wireless transmission means 14. The engaged portion 28 is formed on the attachment ring 26. The engaging portion 27 and the engaged portion 28 are the same as those described in the first embodiment, and may be provided over the entire circumference in the circumferential direction or provided at a plurality of locations.
Next, individual proposal examples in FIGS. 8 to 11 will be described. Except for the configuration specifically described, each proposed example has the same configuration as that of the first embodiment described with reference to FIGS.
[0031]
In the proposed example of FIG. 8, the magnetic ring 12 has a stepped cylindrical surface shape in which the outer diameter surface is a small diameter portion and a large diameter portion, and the small diameter portion is fitted to the two inner diameter surfaces of the outer member. ing. That is, the magnetic body ring 12 is fitted and attached to the inner diameter surface of the outer member 2 at a part in the axial direction. The inner diameter surface and the outer side surface portion 33 of the magnetic ring 12 are flat surfaces having no step.
The attachment ring 26 of the wireless transmission means 14 is sandwiched between the outermost peripheral portions 35 and 36 of the two ferromagnetic rings 30a and 30b in a state where the side portion 26b is abutted against the side portion 33 of the ferromagnetic ring 30b. Are integrated with the magnetic body ring 12. The end of the outermost peripheral portion of the ferromagnetic ring 30a of the ring member 12 is bent by caulking in the direction of the side surface portion 26b of the mounting ring 26 after the ferromagnetic ring 30b and the mounting ring 26 are fitted. It may be prevented from coming off. The inner peripheral cylindrical portion 26 a protrudes outward in the axial direction from the side surface portion 33 of the magnetic ring 12. The seal member 18 is fitted to the wireless transmission means 14 on the inner diameter surface of the inner peripheral cylindrical portion 26 a of the mounting ring 26 protruding in this way. The seal member 18 is fitted into a corner portion constituted by the inner peripheral cylindrical portion 26 a and the side surface portion 33 of the magnetic ring 12. The material of the mounting ring 26 is a magnetic material so as to be sandwiched in the magnetic material ring 12, and is a material having rust prevention properties. The attachment ring 26 may be joined to the magnetic ring 12 by welding.
[0032]
As described above, the annular wireless transmission means 14 is disposed outside the magnetic ring 12 in the axial direction, and the wireless transmission means 14 is used as a mounting portion of the seal member 18. The joint protrusion can be eliminated, the magnetic path length of the magnetic ring is shortened, and the magnetic resistance is reduced. As a result, the power generation efficiency is increased and the generator can be reduced in size. Further, by fitting the annular wireless transmission means 14 to the magnetic ring 12 so as to be integrated, the coaxiality between the outer member 2 and the inner member 3 can be improved, and the sealing performance is improved.
[0033]
In the proposed example of FIG. 9, the wireless transmission means 14 is attached to the outer member 2 by fitting the outer peripheral cylindrical portion 26 c of the attachment ring 26 of the wireless transmission means 14 to the outer diameter surface of the outer member 1. is there. In this configuration, the material of the mounting ring 26 is not limited to a magnetic material as long as it is a rust-proof material. For example, austenitic stainless steel (JIS standard SUS304, etc.) may be used. . As the material of the magnetic ring 12, a high magnetic permeability material having no rust prevention property can be used. For example, permalloy, silicon steel plate, rolled steel plate and the like may be used. By using a high permeability material, the power generation efficiency is further improved and the generator can be further miniaturized.
[0034]
In the proposed example of FIG. 10, the magnetic ring 12 has a rectangular cross-sectional shape, and the outermost diameter portion 36 protrudes inward in the axial direction, and this protruding portion is the outer diameter surface of the outer member 2. The magnetic ring 12 is attached to the outer member 2 by being fitted in the press-fitted state. The wireless transmission means 14 is attached to the magnetic ring 12 by overlapping the attachment ring 26 on the outer periphery of the magnetic ring 12 in a press-fitted state. The outer peripheral cylindrical portion 26 c of the mounting ring 26 extends to the outer diameter surface of the outer member 2. The side surface portion 26 b of the mounting ring 26 overlaps the side surface portion 33 of the magnetic material ring 12. The attachment ring 26 may be joined to the magnetic ring 12 by welding or the like.
[0035]
In the proposed example of FIG. 11, the outer peripheral cylindrical portion 26 c of the mounting ring 26 is fixed to the outer diameter surface of the outer member 2 by press fitting. The magnetic body ring 12 has a rectangular cross section and is press-fitted into the inner diameter surface of the outer peripheral cylindrical portion 26c of the mounting 26 so that the magnetic body ring 12 and the wireless transmission means are integrated.
[0036]
Na us, when a sensor for the detection of non-separately rotating the the generator 11 (e.g., vibration and temperature), a wireless transmission unit 14, rotation detection signal and said another sensor to be detected by the generator 11 It is good also as what transmits both this detection signal.
[0037]
【The invention's effect】
This car wheel bearing apparatus of the invention, the portion facing the multi-pole magnet and magnetic ring of the generator for generating electricity by the relative rotation of the fixed member and the rotating member, inside the sealing member for sealing between the rotating member and a fixed member Therefore, it is possible to eliminate the need for rust prevention treatment of the magnet, and the magnet becomes inexpensive. Further, the facing distance between the multipolar magnet and the magnetic ring can be reduced, and a high permeability material can be used for the magnetic ring, so that the power generation efficiency is improved and the generator can be downsized. The seal of the generator, that Do and also unnecessary to provide separate sealing means and the sealing member between the fixed member and the rotating member.
[Brief description of the 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 cross-sectional view of the rotation detection device.
FIG. 3 is a partially enlarged cross-sectional view of the rotation detection device.
4A and 4B are a cross-sectional view and a front view of a generator ring member in the rotation detection device, respectively.
FIG. 5 is a cross-sectional view of a rotation detection device according to another embodiment of the present invention.
FIG. 6 is a cross-sectional view of a rotation detection device according to a proposed example .
FIG. 7 is a cross-sectional view of a rotation detection device according to still another embodiment of the present invention.
FIG. 8 is a cross-sectional view of a rotation detection device according to still another proposed example .
FIG. 9 is a cross-sectional view of a rotation detection device according to still another proposed example .
FIG. 10 is a cross-sectional view of a rotation detection device according to still another proposed example .
FIG. 11 is a cross-sectional view of a rotation detection device according to still another proposed example .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fixed member 2 ... Outer member 3 ... Inner member 4 ... Rolling body 5a ... Rolling surface 6a, 6b ... Rolling surface 7 ... Rotating member 8 ... Cage 9 ... Seal member 11 ... Generator 12 ... Magnetic body Ring 13 ... Multipole magnet 14 ... Wireless transmission means 15 ... Constant velocity universal joint 16 ... Magnet member 17 ... Core metal 18 ... Sealing member 19 ... Seal core 20 ... Seal 21 ... Radial lip 22 ... Side lip 23 ... Slinger 26 ... Mounting ring 27 ... Engagement part 28 ... Engagement part 30a, 30b ... Ferromagnetic ring 37 ... Constant velocity universal joint cup 38 ... Wireless transmitter

Claims (3)

A rotating member that is rotatably supported by a fixed member, a generator that generates power by the relative rotation of the fixed member and the rotating member, a rotation speed signal that is output from the generator, and the generated power of the generator operate as a power source. Transmitting means for wirelessly transmitting at least the rotational speed signal of the output signals of the sensor, and a sealing member for sealing a gap between the fixing member and the rotating member, wherein the fixing member is arranged in a double row on the inner periphery. An outer member having a running surface and a flange on the outer periphery, and a knuckle to which the outer member is attached via the flange, the rotating member facing each rolling surface of the outer member. An inner member having a rolling surface, and a wheel bearing device comprising an outer ring of a constant velocity universal joint fixed to the inner member and having a cup portion aligned in the axial direction with the inner member,
The outer member is located at a position where the end surface on the cup portion side of the constant velocity universal joint is retracted inward in the axial direction from the end surface of the inner member, and the generator has magnetic poles arranged in a circumferential direction. A multi-pole magnet and a magnetic ring that accommodates the coil and faces the multi-pole magnet, and the multi-pole magnet is fixed to the outer periphery of the inner member, and the magnetic ring has an outer diameter The magnetic ring is formed by a stepped cylindrical surface having a small diameter portion and a large diameter portion, and is fitted to the inner diameter surface of the outer member on the cup portion side at the small diameter portion. Is partially protruded outward in the axial direction, which is closer to the cup portion than the end surface of the inner member, and the wireless transmission means is formed in an annular shape and is positioned adjacent to the axially outer side of the magnetic ring. And fixed to the magnetic ring integrally with the magnetic body ring. The inner diameter surface of the groove has a stepped shape that forms a concave corner portion at the end on the cup portion side, and the seal member is fitted to the corner portion, and the seal lip of the seal member is used as the rotating member. This seal contact portion is formed by a slinger fitted to the outer periphery of the cup portion of the constant velocity universal joint, and is connected to the magnetic ring of the generator inside the seal member. The polar magnets are opposed to each other, and the magnetic ring includes a pair of ferromagnetic rings facing each other, the pair of ferromagnetic rings are fitted to each other at the outermost periphery, and in a facing portion with the multipolar magnet, A plurality of comb-like claws bent in opposite directions are formed, and the comb-like claws of both ferromagnetic rings are alternately arranged at intervals in the circumferential direction. apparatus.   An engaged portion made of a protrusion or a depression is formed on the inner diameter surface of the magnetic ring of the generator, and the sealing member is formed from the depression or the protrusion engaged with the engaged portion of the inner diameter surface of the magnetic ring. The wheel bearing device according to claim 1, wherein an engaging portion is formed, the engaged portion and the engaging portion are engaged, and the seal member is fitted to an inner diameter surface of the magnetic ring.   The said multipolar magnet consists of a cyclic | annular metal core and the magnet member fixed to this metal core, The said slinger was integrally formed with the said metal core of the said multipolar magnet. Wheel bearing device.

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