JP2003287046A - Bearing device for wheel with 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 sufficiently provided, and flexibility of designing is also easily provided. <P>SOLUTION: The bearing device for the wheel with the generator has an outer member 2 and an inner member 3 positioned outside and inside through double row rolling elements 4. The outer member 2 is mounted on a car body through a knuckle 10. The inner member 3 is mounted on the wheel. The generator 11 is constituted of a multipolar magnet 12 on which magnetic poles are aligned in the circumferential direction and a magnetic body ring 13 facing against the multipolar magnet 12 by storing a coil 25. The magnetic body ring 13 is mounted on the knuckle 10, and the multipolar magnet 12 is mounted on the inner member 13. <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.

[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. 15 shows a proposal example of a bearing device for a wheel with a generator of this type. This bearing uses a multi-pole magnet 73 attached to the inner member 63 and a magnetic ring 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 machine 71 is configured to generate electric power by the relative rotation of the inner and outer members 63, 62. A coil is provided in the magnetic ring 72. The magnetic ring 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. The fixing member 75 is a member that serves as a core metal of the multipolar magnet 73, and has a portion that serves as a slinger 75 a with respect to the seal member 79. Fixing member 76 to which the magnetic ring 72 is fixed
Wireless transmission means 78 is installed in the wireless transmission means 7 and the power generation output of the generator 71 is used as a rotation detection signal.
8 is transmitted as a radio wave outside the bearing. Outer member 6
2 is attached to a knuckle 80, and an outer ring 81 of a constant velocity universal joint is connected to the inner member 63.

[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. However, in FIG.
In the bearing device for a wheel of the above example, since the seal member 79 is provided between the fixing members 75 and 76, the fixing member 75,
The contact pressure of the seal member 79 cannot be secured due to an error in the mounting position of 76, and the seal may be incomplete. For this reason, the cross-sectional area of the seal member 79 must be increased so that the error can be absorbed. However, due to the relationship with surrounding parts such as the knuckle 80 and the constant velocity universal joint outer ring 81, the seal member 79 has such a large disconnection. It may not be possible to secure the area. The space between the knuckle 80 and the constant velocity universal joint outer ring 81 has become very small due to the demand for downsizing of the wheel bearing device. 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. When the seal member 79 is arranged directly between the outer member 62 and the inner member 63 as in a general wheel bearing device without a generator, the sealing performance can be secured, but the generator 71 is arranged outside the seal member 79. Therefore, a separate sealing means for the generator 71 is required. It is also proposed that the slinger 75a for the seal member 79 is arranged in the constant velocity universal joint outer ring 81 to increase the installation space of the generator 71 and the installation space of the seal member 79, but it is still a sufficient installation space for the generator 71 and the like. Is difficult to secure. Generator 71 and sealing member 79
Depending on the size, the required thickness of the cup portion of the constant velocity universal joint outer ring 81 may not be secured. When the wireless transmission means 78 is provided, the installation space is further limited.

An object of the present invention is to provide a bearing device for a wheel with a generator, in which a sufficient installation space for the generator can be obtained and a degree of freedom in design can be easily obtained.

[0006]

A bearing device for a wheel with a generator according to the present invention includes an outer member mounted on a vehicle body through a knuckle and having a double row rolling surface on the inner circumference, and an outer member on these rolling surfaces. In a wheel bearing device that includes an inner member having rolling surfaces facing each other and a double row rolling element accommodated between both rolling surfaces, the wheel bearing device rotatably supports the magnetic poles in the circumferential direction. A generator comprising a lined multi-pole magnet and a magnetic ring containing a coil and facing the multi-pole magnet was provided, the magnetic ring was attached to the knuckle, and the multi-pole magnet was attached to the inner member. Is characterized by. According to this configuration, the magnetic body ring of the generator is attached to the knuckle, so that the space between the constant velocity universal joint outer ring and the knuckle can be efficiently used as an installation space for the generator. Therefore, the generator can be arranged at the end portion on the bearing inboard side where there is not enough space without a problem in volume, and the degree of freedom in design is easily obtained. In the above configuration, the end surface of the outer member on the inboard side may be retracted toward the center side in the axial direction with respect to the end surface of the inner member, and the magnetic body ring of the generator may be arranged in the retracted space. When the magnetic ring is attached to the knuckle and the seal member is attached to the magnetic ring, it is not necessary to fit the seal member to the inner diameter surface of the outer member. The part can be retracted. By retracting the end portion of the outer member in this manner, the material of the outer member is reduced accordingly, and the cost of the bearing is reduced. In addition, the space for disposing the outer member expands the space for disposing the generator and sealing member,
More freedom in design.

In the present invention, a slinger is provided outside the multi-pole magnet of the inner member, and a seal member that comes into contact with the slinger is attached to the magnetic ring. The slinger is provided between the tip of the slinger and the seal member. A non-contact seal may be formed. By arranging the slinger and the seal member so that they are in contact with each other on the outer side of the bearing than the multipole magnet, the facing portion of the multipole magnet and the magnetic ring is inside the seal member, and the surface of the multipole magnet It is possible to prevent dust from entering and biting. The seal member can serve both as a seal inside the bearing and protection of the surface of the multi-pole magnet of the generator. Therefore, unlike the case where another seal is provided for the generator, the surface of the multi-pole magnet can be surely protected. . Also,
Since the seal member forms a non-contact seal with the tip of the slinger, the sealing effect can be obtained by both the contact seal and the non-contact seal by the seal lip, and high sealing performance can be obtained. Therefore, the performance of preventing the intrusion of mud salt water into the bearing from the outside is enhanced. Since the seal member is attached to the magnetic ring, it is not necessary to provide a separate attachment component, and the space can be used efficiently. For these reasons, the space where the seal member is conventionally arranged and the entire space from the outer diameter surface of the constant velocity universal joint outer ring to the inner diameter surface of the knuckle can be freely distributed to the space where the generator and the seal member are arranged. Available and more design freedom.

When the multi-pole magnet has a cored bar, the cored bar and the slinger may be an integral part. By thus integrating the core metal and the slinger, the number of parts and the number of assembling steps can be reduced and the cost can be reduced.

In the present invention, the outer ring of the constant velocity universal joint is attached to the inner member, or the outer ring of the constant velocity universal joint is provided as a constituent part of the inner member, and the multipole is attached to the outer ring of the constant velocity universal joint. A magnet may be attached. In that case, the multi-pole magnet may be attached to the outer ring of the constant velocity universal joint. When the multi-pole magnet is provided on the outer ring of the constant velocity universal joint in this manner, the mounting allowance of the multi-pole magnet in the inner member is unnecessary, and the portion functioning as the bearing is made compact.

In the present invention, it is also possible to provide a support plate attached to the knuckle by a bolt for attaching the outer member to the knuckle, and attach the magnetic ring to the inner diameter surface of the cylindrical portion formed on the support plate. When the support plate is thus provided and the magnetic ring is attached to the inner diameter surface of the support plate, the magnetic ring can be easily attached to the support plate by fitting or the like. Further, since the support plate is attached by the bolts for attaching the outer member to the knuckle, the support member can be attached together when the outer member is attached to the knuckle, and labor such as bolting for attaching the support plate can be omitted. Therefore, the magnetic ring can be easily attached to the knuckle.

When the support plate is provided as described above, the support plate is provided with an inward flange extending toward the inner diameter side from the inner diameter surface of the outer member, and a gap is provided axially inward of the inward flange portion. A labyrinth seal may be configured by providing seal plates arranged side by side on the outer diameter surface of the inner member, and the inward flange and the seal plate. By forming the labyrinth seal in this way, it is possible to prevent leakage of a lubricant such as grease sealed inside the bearing. The labyrinth seal can be formed with a small number of parts because the inward flange part that is a part of the support plate is used.

When the support plate is provided as described above, the vicinity of the opening on the mounting side of the support plate on the inner diameter surface of the knuckle is a stepped cylindrical surface that widens the opening side, and the cylindrical portion of the support plate is the knuckle. It may be formed into a stepped cylindrical shape that fits into the stepped cylindrical surface. In that case, an axial gap is provided between the stepped surface of the stepped cylindrical surface of the knuckle and the stepped surface of the stepped cylindrical portion of the support plate, and an elastic seal is provided in the axial direction clearance. May be interposed. In this way, by providing an elastic seal at the end of the step surface as a stepped cylindrical surface, it is possible to reliably perform the sealing between the knuckle and the support plate.

Further, when the support plate is provided, a resin layer for sealing a gap between the vicinity of the opening on the mounting side of the support plate on the inner diameter surface of the knuckle and the outer diameter surface of the cylindrical portion of the support plate. May be provided on the outer diameter surface of the support plate. When the resin layer is provided in this way, it is possible to achieve a seal between the knuckle and the support plate without interposing an elastic seal such as an O-ring. Therefore, the number of parts is reduced and the assembly is facilitated.

In the case of each of the above-described configurations of the present invention, a sensor that operates using the power generated by the generator as a power source may be provided. This sensor may detect rotation, or may detect items other than rotation, such as temperature and vibration. Since the generator is used as a power source, it is not necessary to route the wiring, and the wiring system is simplified.

Further, in the case of each of the above-mentioned configurations of the present invention, at least one of the wheel rotation speed signal output by the generator and the output signal of the sensor operating by using the power generated by the generator as a power source is wirelessly transmitted. The means may be provided near the magnetic ring. By providing the wireless transmission means in this way, the wheel bearing and the signal wiring at the vehicle body end can be eliminated. Further, since the generator is used for rotation detection or sensor power supply, it is possible to eliminate the power supply wiring. For this reason, it is possible to omit the wiring work and easily assemble the vehicle body while using the bearing device with the detection function. If a wireless transmission means is provided, its installation space is required, but since the magnetic ring of the generator is attached to the knuckle, as described above, the space between the knuckle and the outer diameter surface of the constant velocity universal joint outer ring is With respect to space, it is easy to obtain a degree of freedom in design, and thus it is easy to secure an installation space for wireless transmission means.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. This embodiment is a wheel bearing device equipped with a generator that serves as a rotation sensor, and its fixing member 1 is composed of 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. Rotating member 7
Is composed of the inner member 3 and the outer ring 15a of the constant velocity universal joint 15 fixed to the inner diameter surface thereof. Constant velocity universal joint outer ring 1
The shaft portion 16 integrally extending from 5a includes a large-diameter portion 16 on the base end side.
It is formed by a and the small diameter portion 16b, and the inner member 3 is spline-fitted to the outer periphery of the small diameter portion 16b. A constant velocity universal joint outer ring 15a is fastened and fixed to the inner member 3 by a nut 17 screwed to the end portion of the small diameter portion 16b on the outboard side.

The outer member 2 has a double row rolling surface 5a,
Rolling surfaces 6a and 6b which have 5b and oppose these rolling surfaces 5a and 5b, respectively, are provided on the outer periphery of the inner member 3. The inner member 3 includes a hub wheel 3A and other inner ring constituent members 3
B are combined, and the rolling surfaces 6a and 6b of each row of the double rows of rolling surfaces 6a and 6b are formed on each of the hub wheel 3A and the inner ring constituent member 3B. The double row rolling element 4 is provided between the rolling surfaces 5a and 6a and between the rolling surfaces 5a and 6a.
It is housed between b and 6b. The inner member 3 has a wheel mounting flange 3a, and the wheel is mounted to the wheel mounting flange 3a with bolts 14. The rolling element 4 has a cage 8 for each row.
Is held in. Outer member 2, inner member 3, rolling element 4
The cage 8 constitutes a rolling bearing, and the outer member 2 and the inner member 3 serve as bearing rings. 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 rolling element 4 on the outboard side. A generator 11 is provided at the end of the rolling bearing on the inboard side.

The generator 11 comprises a multi-pole magnet 12 in which magnetic poles N and S are arranged in the circumferential direction, and a magnetic ring 13 facing the multi-pole magnet 12. The end surface of the outer member 2 on the inboard side is retracted more toward the center side in the axial direction than the end surface of the inner member 3, and the magnetic body ring 13 of the generator 11 is arranged in the retracted space. There is. The magnetic ring 13 is attached to the inner peripheral side of the outer member attaching portion 10 a of the knuckle 10, and the multipole magnet 12 is attached to the outer diameter surface of the inner member 3. The magnetic ring 13 has a generator 1
A wireless transmission means 20 for wirelessly transmitting the power generation output of No. 1 as a wheel rotation speed signal is attached.

The magnetic ring 13 is attached to the knuckle 10 via a support plate 18 as shown in FIG. Support plate 18
Is a cylindrical portion 18a along the inner periphery of the ring-shaped outer member mounting portion 10a of the knuckle 10, and the cylindrical portion 1a.
8a has an attachment flange portion 18b bent in the outer diameter direction from the end portion on the inboard side. The mounting brim 18b is
An insertion hole for a bolt 19 for attaching the outer member 2 to the knuckle 10 is formed, and the outer member mounting portion 1 of the knuckle 10 is formed.
It is arranged along the end face of 0a. When the outer member 2 is attached to the knuckle 10 with the bolt 19, the support plate 18 is fixed to the knuckle 10 by tightening the attachment collar portion 18b between the bolt 19 and the outer member attachment portion 10a. The magnetic body ring 13 is attached to the knuckle 10 via the support plate 18 by press-fitting the outer diameter surface of the magnetic body ring 13 into the inner diameter surface of the cylindrical portion 18 a of the support plate 18.

At the end of the support plate cylindrical portion 18a facing the outboard side, an inward facing flange portion 18 which is bent in the inner diameter direction is formed.
c is formed. By pressing one side surface of the magnetic ring 13 against the inward flange 18c, the magnetic ring 13 is axially positioned. The inner surface of the outer member mounting portion 10a of the knuckle 10 is a stepped cylindrical surface that expands toward the opening near the opening on the mounting side of the support plate 18. The cylindrical portion 18a of the support plate 18 is also formed in a stepped cylindrical shape, the small diameter portion of which is fitted to the inner diameter surface small diameter portion of the outer member mounting portion 10a of the knuckle 10, and the large diameter portion of which is the outer member mounting portion. It is fitted to the large diameter portion of the inner diameter surface of 10a. By sandwiching the elastic seal 21 between the step surface 10aa of the inner diameter surface of the outer member mounting portion 10a and the step surface 18aa of the support plate cylindrical portion 18a, the inner diameter surface of the outer member mounting portion 10a and the support plate cylindrical portion 18a. The axial gap between the and is sealed by the elastic seal 21. The elastic seal 21 is a ring-shaped member and is composed of an O-ring or the like.

As shown in FIG. 4, the magnetic ring 13 is composed of
Two ferromagnetic ring members 30a, 3 facing each other in the axial direction
0b and another ferromagnetic ring member 3 sandwiched between the outermost peripheral portions 35 and 36 of the ring members 30a and 30b.
0c and. Ferromagnetic material ring members 30a, 30b,
Reference numeral 30c is an annular member having a cross-sectional shape shown in FIG. 3A, and is fitted to each other at the outermost peripheral portions 35, 36, 37. A plurality of comb-shaped claws 31a and 31b are formed on the inner peripheral sides of the ferromagnetic rings 30a and 30b and are bent from the side surface portions 32 and 33 to the opposite side surfaces. The comb-teeth-shaped claws 31a and 31b are alternately arranged at predetermined intervals in the circumferential direction. The comb-shaped claws 31a and 31b
Are opposed to the multipole magnet 12 at a predetermined interval to form a claw pole type generator. Ferromagnetic rings 30a, 30b,
The material of 30c is ferritic stainless steel (JIS
A standard SUS430-based magnetic material with rustproof properties is used.

As shown in FIG. 3, the coil 25 wound around the bobbin 24 and the electric circuit section 26 of the wireless transmission means 20 are housed inside the magnetic ring 12 which is the yoke of the generator 11. There is. Wireless transmission means 2
As shown in the block diagram of FIG. 5, the electric circuit unit 26 of 0 is a signal processing circuit 40 that processes the power generation output of the generator 11 and extracts it as a wheel rotation speed signal, and the wheel rotation speed signal processed by this circuit. Circuit 41 for transmitting as radio waves
And a power supply circuit 42 that supplies the power generation output of the generator 11 as the power supply of the signal processing circuit 40 and the transmission circuit 41.
The transmitting antenna 43 is connected to the transmitting circuit 41. The transmission circuit 41 is composed of an oscillation / modulation circuit. The receiving means 44 for receiving the signal transmitted by the wireless transmitting means 20 is
It comprises a receiving antenna 45 and a receiving circuit 46 which is a tuning / demodulating circuit for tuning and demodulating a received signal. The transmission antenna 43 of the wireless transmission means 20 is shown in FIG.
The magnetic ring 13 is disposed on the outer peripheral side of the small diameter portion of the ferromagnetic ring member 30c protruding from one side surface to the inboard side, and is molded with resin 27 as shown in FIG. The electric circuit section 26 inside the magnetic ring 13 and the transmitting antenna 43
Are connected by passing the wiring through a wiring hole that penetrates one side of the magnetic ring 13 in the axial direction. Note that a part of the circuit of the electric circuit unit 26 may be installed outside the magnetic body ring 13 together with the transmitting antenna 43.

In FIG. 3, the multi-pole magnet 12 is composed of a multi-pole magnet member 28 and an annular cored bar 29. The magnet member 28 is, for example, a rubber magnet and is vulcanized and bonded to the cored bar 29. When the cored bar 29 is provided, it is desirable that the cored bar 29 is formed of a magnetic material, particularly a ferromagnetic material. The cored bar 29 may be an annular member having an L-shaped cross section as shown in the figure, or an annular member having a concave cross section. The annular cored bar 29 is fitted and fixed to the outer diameter surface of the inner member 3 in an interference fit state. Multipole magnet 12
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 multi-pole magnet 12 is a plastic magnet or a sintered magnet, the cored bar 29 does not necessarily have to be provided.

Ferromagnetic ring member 3 of magnetic ring 13
A seal member 47 is attached to the inner peripheral side of the small diameter portion at 0c. The seal member 47 is formed by joining and integrating a seal 49 made of an elastic material with a cored bar 48. The core 48 is
It has an L-shaped cross section. The seal 49 has a lip. Although the number of lips may be arbitrary, in the illustrated example, one radial lip 50a and two side lips 50b are provided. A slinger 51 serving as a seal contact portion is provided on the shoulder portion of the constant velocity universal joint outer ring 15a so as to face the seal member 47. The slinger 51 is made of stainless steel. The inboard-side seal member 47 and the outboard-side seal member 9 (FIG. 2) allow mud salt water and the like to enter the annular space between the outer member 2 and the inner member 3 from the outside of the bearing. Can be prevented. The slinger 51 has an L-shaped cross section, and a small gap is provided between the tip of the flange portion extending in the radial direction and the outer diameter side base end of the seal member 47 to form the non-contact seal 53. This further improves the sealing property. The inward flange 18 of the support plate 18
c is in contact with the end surface of the outer member 2 and extends toward the inner diameter side with respect to the inner diameter surface of the outer member 2. A ring-shaped seal plate 52 arranged axially inward of the inward flange 18a with a gap.
Is provided on the outer diameter surface of the inner member 3, and the labyrinth seal 59 is constituted by the inward flange 18c and the seal plate 52. The seal plate 52 has an L-shaped cross section and is fitted to the outer diameter surface of the inner member 3 at its cylindrical surface portion. The labyrinth seal 59 prevents leakage of the grease filled in the bearing.

The outer ring 15a of the constant velocity universal joint 15 has a fillet surface extending to the inner diameter side of the inboard side end portion of the inner ring constituent member 3B forming a part of the inner member 3 in order to secure its thickness. Curved portion 15aa along the curved surface portion 1 and
A tapered portion 15ab extending from 5aa to the shaft portion 16 is formed.

The operation of the above configuration will be described. A part of the power generation output of the generator 11 is input to the electric circuit section 26 provided in the magnetic body ring 13 and is taken out as a wheel rotation speed signal by the signal processing circuit 40 thereof. Also, the generator 1
The power generation output of No. 1 is supplied to the power supply circuit 42, rectified and smoothed, and supplied as the power supply of the signal processing circuit 40 and the transmission circuit 41. The obtained wheel rotation speed signal is transmitted from the transmission circuit 41 to the reception means 44 as a radio wave via the transmission antenna 43.

According to the bearing device for a generator-equipped wheel of this structure, the magnetic ring 13 of the generator 11 is connected to the knuckle 10.
In addition, since the multi-pole magnets 12 are attached to the inner members 3, respectively, the generator 11 can be installed in the space on the bearing inboard side with a small margin with high space efficiency, and the degree of freedom in design is increased. Particularly, the end surface of the outer member 2 is retracted inward from the end surface of the inner member 3, and the generator 1 is placed in the retracted space.
Since the magnetic ring 13 of 1 is arranged, the generator 11
You can get more space. Since the material used for the outer member 2 is reduced by the amount of the outer member 2 retracted, the material cost is also reduced. Further, since the support plate 18 is attached to the knuckle 10 by the bolt 19 for attaching the outer member 2 to the knuckle 10, and the magnetic ring 13 of the generator 11 is attached to the inner diameter surface of the cylindrical portion 18a formed on the support plate 18. The magnetic ring 13 can be easily attached. The inward flange 18c of the support plate 18 is provided,
Since the labyrinth seal 59 is configured with the seal plate 52 on the outer periphery of the inner member 3, the grease leakage prevention effect can be obtained with a small number of parts. Further, since the slinger 51 is provided on the inboard side of the installation portion of the multi-pole magnet 12 in the inner member 3, and the seal member 47 that comes into contact with the slinger 51 is attached to the magnetic ring 13, the seal inside the bearing is The common seal member 47 can protect the multi-pole magnet 12 of the generator 11. Since the non-contact seal 53 is formed between the seal member 47 and the tip of the slinger 51, the sealing property is further improved. Support plate 1 for knuckle 10
In the fitting portion of 8, the elastic seal 2 is formed as a stepped cylindrical surface.
Since 1 is interposed, the fitting surface can be reliably sealed.

FIG. 6 shows another embodiment of the present invention.
In this embodiment, in the first embodiment shown in FIGS. 1 to 5, the cylindrical portion 18a of the support plate 18 is not stepped, and the resin layer 54 is formed on the outer diameter surface of the cylindrical portion 18a. . By fitting the resin layer 54 into the large diameter portion of the stepped cylindrical surface of the outer member mounting portion 10a of the knuckle 10,
Sealing is performed between the inner diameter surface of the knuckle 10 and the support plate cylindrical portion 18a. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, the knuckle 10 and the support plate cylindrical portion 10a can be sealed without interposing the elastic seal 21 such as an O-ring, so that the number of parts is reduced and the assembly is facilitated. Become.

FIG. 7 shows still another embodiment of the present invention. In this embodiment, in the first embodiment shown in FIGS. 1 to 5, one end of a ferromagnetic ring member 30a, which is a constituent member of the magnetic ring 13, is extended, and the extension is used as a support plate 18. . Other configurations are the same as those in the first embodiment.

In the case of this embodiment, the ferromagnetic ring member 30a, which is a constituent member of the magnetic ring 13, and the support plate 18 are provided.
Since and are integrated, the number of parts is reduced and the generator 11 can be constructed at low cost. In this case, the magnetic ring 1
Since a part of 3 is exposed to the outside of the bearing, a magnetic material having excellent water resistance, such as magnetic stainless steel, is used as a constituent member of the magnetic ring 13.

FIG. 8 shows still another embodiment of the present invention. In this embodiment, in the first embodiment shown in FIGS. 1 to 5, the cored bar 29 of the multi-pole magnet 12 is formed into a stepped cylindrical shape continuing from the large diameter portion to the small diameter portion toward the inboard side, The large diameter portion is fitted to the outer diameter surface of the inner member 3, and the small diameter portion is fitted to the shoulder portion of the outer ring 15a of the constant velocity universal joint 15, respectively.
The stepped surface 29a is brought into contact with the end surface of the inner ring constituting member 3B. The magnet member 28 is vulcanized and bonded to the outer diameter surface of the small diameter portion of the cored bar 29. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, the axial length can be shortened by the mounting margin of the multi-pole magnet 12 in the inner member 3.
Accordingly, the axial length of the constant velocity universal joint outer ring 15a can be increased, and the thickness of the outer ring 15a can be sufficiently secured.

FIG. 9 shows still another embodiment of the present invention. In this embodiment, the constituent member 3 of the magnetic ring 13 is
In the embodiment shown in FIG. 7 in which 0a and the support body 18 are integrated, the core metal 29 of the multipolar magnet 12 is straddled from the inner member 3 to the constant velocity universal joint outer ring 15a as in the embodiment shown in FIG. It is installed. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, the number of parts is reduced, the generator 11 can be constructed at a low cost, and the outer ring 15a is formed.
It is possible to secure sufficient thickness.

FIG. 10 shows still another embodiment of the present invention. In this embodiment, in the first embodiment shown in FIGS. 1 to 5, the generator 11A is an axial type. That is, the multi-pole magnet 12 attached to the inner member 3
Is installed so that the magnetized surface where the magnetic poles N and S are arranged in the circumferential direction is oriented in the axial direction. Further, the magnetic ring 13 provided on the knuckle 10 side is installed so as to face the magnetized surface of the multi-pole magnet 12 in the axial direction. The comb-shaped claws 31a and 31b of the magnetic ring 13 are formed on the side surface facing the multipolar magnet 12. In addition, the inward flange 18 of the support plate 18
The c is formed short so as not to cover the claws 31a and 31b of the magnetic ring 13. The seal plate 52 in the example of FIG. 1 is omitted. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, since the generator 11 is an axial type, the multi-pole magnet 1 in the inner member 3 is used.
The mounting margin of 2, that is, the axial length can be shortened, and the axial length of the constant velocity universal joint outer ring 15a can be lengthened accordingly, and the wall thickness of the outer ring 15a can be sufficiently secured. Further, since it is an axial type, the multi-pole magnet 12 has a shape extending in the radial direction, and the multi-pole magnet 12 functions as a labyrinth seal for preventing grease leakage, like the seal plate 52 in the first embodiment. Play. Therefore, the seal plate 52 can be omitted, and the number of parts and the number of assembling steps can be reduced and the cost can be reduced.

FIG. 11 shows still another embodiment of the present invention. In this embodiment, in the embodiment of FIG. 10 in which the generator 11 is an axial type, one end of a ferromagnetic ring member 30a, which is a component of the magnetic ring 13, is extended, and the extended portion is supported by a support plate 18. I am trying. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, the ferromagnetic ring member 30a, which is a constituent member of the magnetic ring 13, and the support plate 18 are provided.
Since the and are integrated, the number of parts is reduced and the generator 11A can be constructed at low cost.

FIG. 12 shows still another embodiment of the present invention. In this embodiment, the entire multipolar magnet 12 is fitted to the shoulder portion of the constant velocity universal joint outer ring 15a in the first embodiment shown in FIGS. One end of the cored bar 29 of the multi-pole magnet 12 is extended to the inboard side, and this extended portion serves as a slinger 51 which is a seal contact member. The constant velocity universal joint outer ring 15a is firmly connected to the inner member 3 by tightening with a nut 17 screwed to the shaft portion 16 as shown in FIG.
Since a large surface pressure is generated between the end surface 3c of the inner ring constituting member 3B and the end surface 15ac of the shoulder portion of the outer ring 15a which faces the inner surface forming member 3B, a contact area is required between both end surfaces. Therefore, in the case of this embodiment, the radius of curvature of the corner portion 3d that changes from the end surface 3c of the inner ring constituent member 3B to the inner diameter side is made small to secure the contact area of the both end surfaces. Other configurations are the same as those in the first embodiment.

In this embodiment, since the cored bar 29 of the multi-pole magnet 12 and the slinger 51 are integrated, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

FIG. 13 shows still another embodiment of the present invention. In this embodiment, in the embodiment of FIG. 12 in which the cored bar 29 of the multi-pole magnet 12 and the slinger 51 are integrated, the ferromagnetic ring member 3 which is a constituent member of the magnetic ring 13.
One end of 0a is extended and the extended portion is used as the support plate 18. Other configurations are the same as those in the first embodiment.

In the case of this embodiment, not only the cored bar 29 of the multi-pole magnet 12 and the slinger 51 are integrated, but also the magnetic ring 13 and the support plate 18 are integrated, so that the number of parts and the number of assembly steps are reduced. The number can be further reduced and the cost can be further reduced.

FIG. 14 shows still another embodiment of the present invention. In this embodiment, a sensor 55 is provided inside the magnetic ring 13 of the generator 11 in the first embodiment shown in FIGS. 1 to 5. The sensor 55 is composed of a Hall element or the like. In this case, the multi-pole magnet 1 associated with the rotation of the wheel 1
The sensor 55 detects the change in magnetic pole 2 as a wheel rotation speed signal, and the wireless transmission means 20 transmits the signal as a radio wave. The power generation output of the generator 11 is supplied as a power source for the rotation detection sensor 55 and the wireless transmission means 20.
The sensor 55 is not limited to detecting rotation, but may be temperature, vibration, or the like. Further, the arrangement of the sensor 55 is not limited to the inside of the magnetic ring 13, and may be the outer member 1 or the knuckle 10.

The above-described embodiments are the same as the constant velocity universal joint 1
The outer ring 15a of No. 5 is formed separately from the inner member 3 and is attached to the inner member 3. However, in this wheel bearing device, the outer ring 15a of the constant velocity universal joint 15 has the structure of the inner member 3. The rolling surface 6b may be formed as a portion on the outer ring 15a.

[0046]

According to the bearing device for a wheel with a generator of the present invention, an outer member mounted on a vehicle body through a knuckle and having a double row of rolling contact surfaces on the inner circumference, and rolling members facing the rolling contact surfaces, respectively. A wheel bearing device comprising an inner member having a running surface and a double row rolling element accommodated between both rolling surfaces and provided with a generator comprising a multi-pole magnet and a magnetic ring, wherein Since the ring is attached to the knuckle and the multi-pole magnet is attached to the inner member, it is possible to effectively use the space on the bearing inboard side with little margin, and the generator installation space can be sufficiently obtained to increase the design freedom. The effect is obtained.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of a main part of the wheel bearing device.

FIG. 3 is a partially enlarged cross-sectional view showing a generator installation portion of the wheel bearing device.

4A and 4B are a cross-sectional view and a front view of a generator magnetic material ring in the bearing device for a wheel, respectively.

FIG. 5 is a block diagram showing a relationship between a generator, wireless transmission means, and reception means in the bearing device for a wheel.

FIG. 6 is a partially enlarged sectional view of a wheel bearing device according to another embodiment of the present invention.

FIG. 7 is a partially enlarged cross-sectional view of a wheel bearing device according to still another embodiment of the present invention.

FIG. 8 is a partially enlarged sectional view of a wheel bearing device according to still another embodiment of the present invention.

FIG. 9 is a partially enlarged cross-sectional view of a wheel bearing device according to still another embodiment of the present invention.

FIG. 10 is a partially enlarged cross-sectional view of a wheel bearing device according to still another embodiment of the present invention.

FIG. 11 is a partially enlarged sectional view of a bearing device for a wheel according to still another embodiment of the present invention.

FIG. 12 is a partially enlarged cross-sectional view of a wheel bearing device according to yet another embodiment of the present invention.

FIG. 13 is a partially enlarged cross-sectional view of a wheel bearing device according to still another embodiment of the present invention.

FIG. 14 is a partially enlarged sectional view of a bearing device for a wheel according to still another embodiment of the present invention.

FIG. 15 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

2 ... Outer member 3 ... Inner member 4 ... rolling elements 5a, 5b ... Rolling surface 6a, 6b ... Rolling surface 10 ... Knuckle 11, 11A ... Generator 12 ... Multi-pole magnet 13 ... Magnetic ring 15 ... Constant velocity universal joint 15a ... Joint outer ring 18 ... Support plate 18a ... Support plate cylindrical portion 19 ... Outer member mounting bolt 20 ... Wireless transmission means 21 ... Elastic seal 25 ... Coil 47 ... Seal member 48 ... Core metal 51 ... Slinger 52 ... Seal plate 53 ... Non-contact seal 54 ... Resin layer 55 ... Rotation detection sensor 56 ... Labyrinth seal

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16C 33/78 F16C 33/78 DE 33/80 33/80 G01P 3/46 G01P 3/46 A G08C 17 / 02 G08C 17/00 B (72) Inventor Takayuki Norimatsu 1578 Higashi-Kaizuka, Iwata-shi, Shizuoka Entienne Co., Ltd. (72) Inventor Eiji Tajima 1578 Higashi-Kaizuka, Iwata-Shi, Shizuoka F-Term (reference) 2F073 AA02 AA03 AA35 AA36 AB01 AB04 AB11 BB02 BC02 CC01 EE12 GG01 GG04 3D046 BB11 BB28 HH36 3J016 AA01 BB03 BB05 BB16 BB17 CA02 CA03 CA07 CA08 3J101 AA02 AA32 AA43 AA54 FAA62 BA73

Claims (10)

[Claims] 1. An outer member mounted on a vehicle body through a knuckle and having double rows of rolling contact surfaces on the inner periphery, an inner member having rolling contact surfaces facing each of these rolling contact surfaces, and both rolling members. In a bearing device for a wheel, which includes a double row rolling element accommodated between the surfaces and rotatably supports a wheel, a multi-pole magnet having magnetic poles arranged in a circumferential direction, and a multi-pole magnet for accommodating the coil A bearing device for a wheel with a generator, characterized in that a generator comprising a magnetic ring facing each other is provided, the magnetic ring is attached to the knuckle, and a multi-pole magnet is attached to an inner member. 2. A slinger is provided outside the multi-pole magnet of the inner member outside the bearing, and a seal member that comes into contact with the slinger is attached to the magnetic ring so that no contact is made between the tip of the slinger and the seal member. The bearing device for a wheel with a generator according to claim 1, wherein a seal is formed. 3. The bearing device for a wheel with a generator according to claim 2, wherein the cored bar forming the multi-pole magnet and the slinger are integrated parts. 4. An outer ring of a constant velocity universal joint is attached to the inner member, or an outer ring of the constant velocity universal joint is provided as a constituent part of the inner member, and the multipole magnet is attached to the outer ring of the constant velocity universal joint. The generator-equipped wheel bearing device according to any one of claims 1 to 3, which is mounted. 5. A support plate attached to the knuckle by a bolt for attaching the outer member to the knuckle,
The bearing device for a wheel with a generator according to any one of claims 1 to 4, wherein the magnetic ring is attached to an inner diameter surface of a cylindrical portion formed on the support plate. 6. The support plate is provided with an inward flange extending toward the inner diameter side from the inner diameter surface of the outer member, and a seal plate arranged axially inward of the inward flange is provided with a seal plate in the inner member. The bearing device for a wheel with a generator according to claim 5, wherein the labyrinth seal is provided on the outer diameter surface, and the inward flange portion and the seal plate constitute the labyrinth seal. 7. A stepped cylindrical surface near the opening on the mounting side of the support plate on the inner diameter surface of the knuckle is a stepped cylindrical surface, and the cylindrical part of the support plate is fitted to the stepped cylindrical surface of the knuckle. There is an axial gap between the stepped surface of the stepped cylindrical surface of the knuckle and the stepped surface of the stepped cylindrical portion of the supporting plate of the knuckle. The bearing device for a wheel with a generator according to claim 5 or 6, wherein an elastic seal is interposed in the gap. 8. A resin layer for sealing a gap between an opening on the inner diameter surface of the knuckle on the mounting side of the support plate and an outer diameter surface of the cylindrical portion of the support plate is provided with an outer diameter of the support plate. The generator-equipped wheel bearing device according to any one of claims 5 to 7, which is provided on a surface. 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 magnetic ring. A bearing device for a wheel with a generator according to any one of claims 1 to 9.