JPH09133698A - Roller bearing unit with tone wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of an antifriction bearing with tone wheel by making excessive investment in plant and equipment and carrying work unnecessary. SOLUTION: The core metal 19 of a seal ring 17 is put on and fixed to the end section of an inner race 1 of a bearing which is the rotating ring of the bearing. A tone wheel 21 composed of a permanent magnet is supported on the side face of a circular ring section 23 constituting the core metal 19 by utilizing the magnetic attracting force of the wheel 2. Therefore, the cost of the bearing can be reduced, because it becomes unnecessary to make a round trip between a magnet manufacturer and a seal manufacturer for carrying parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A rolling bearing unit with a tone wheel according to the present invention rotatably supports a wheel of an automobile with respect to a suspension device, and a rotation speed detecting device for detecting the rotation speed of the wheel. Used to configure.

[0002]

2. Description of the Related Art Anti-lock brake systems (AB)
S) or Traction Control System (TCS)
, It is necessary to detect the rotational speed of the wheels. Therefore, a rolling bearing unit with a rotation speed detecting device is required to rotatably support the wheel with respect to the suspension device and detect the rotation speed of the wheel. As such a rolling bearing unit with a rotation speed detecting device, one having a structure as described in, for example, US Pat. No. 4,948,277 has been conventionally known.

FIG. 8 shows a rolling bearing unit with a rotation speed detecting device described in this specification. The pair of inner wheels 1, 1 each of which is a fixed wheel is externally fitted to a non-rotating axle (not shown) in a state of being incorporated in a suspension device. Inner ring raceways 2, 2 each having a fixed raceway surface are provided on the outer circumferential surfaces of the respective inner races 1, 1 that are fixed circumferential faces.
Are formed respectively. Further, on the inner peripheral surface (rotational peripheral surface) of the hub 3 which is a rotating wheel that rotates during use, double-row outer ring raceways 4 and 4 each of which is a rotational raceway surface are formed. A plurality of balls 5, which are rolling elements, are provided between the outer ring raceways 4 and 4 and the inner ring raceways 2 and 2, respectively.
5 is provided to rotatably support the hub 3 around the axle. A wheel (not shown) of the wheel is fixed to a flange provided on the outer peripheral surface of the hub 3.

Further, the inner end of the hub 3 (inside means the side closer to the center in the width direction when assembled to an automobile, right in FIGS. 1, 2, 4, 6, 7 and 8. The side outward in the width direction is called the outside.) The seal ring 6 is provided in the opening.
The core metal 7 constituting the above is internally fixed. That is, the cylindrical portion 8 formed on the outer peripheral edge of the cored bar 7 is fitted into the opening of the hub 3 by an interference fit. Then, a sealing material 9 made of an elastic material such as rubber is coupled and supported on the inner side surface of the core metal 7, and the tone wheel 1 is attached to the inner side surface of the sealing material 9.
0 is combined and supported. The tone wheel 10 is composed of a permanent magnet, and is formed in an annular shape in which S poles and N poles are alternately arranged in the circumferential direction.

On the other hand, a retaining ring 11 formed by drawing a metal plate is externally fitted and fixed to the inner end portion of the inner inner ring 2 of the pair of inner rings 1 and 1. A plurality of seal lips 12 provided on the seal material 9 that constitutes the seal ring 6,
The tip edge of 12 is slidably contacted with the inner and outer peripheral surfaces and the outer surface of the holding ring 11 to prevent dust and rainwater from entering the parts where the balls 5 and 5 are installed. Further, a sensor 13 is supported and fixed to a part of the holding ring 11, and a detection portion of the sensor 13 is opposed to an inner side surface of the tone wheel 10.

In the case of the rolling bearing unit with the rotation speed detecting device as described above, the wheel fixed to the hub 3 can be rotatably supported on the axle on which the inner rings 1 and 1 are fitted and supported. When the hub 3 rotates together with the wheels, the sensor 1 facing the side surface of the tone wheel 10 fixed to the hub 3 faces the sensor 1.
The output of 3 changes. The frequency at which the output of the sensor 13 changes is proportional to the rotational speed of the wheel. Therefore, if the output signal of the sensor 13 is input to a controller (not shown), the rotation speed of the wheel can be obtained, and the ABS and TCS can be appropriately controlled.

[0007]

In the case of the conventional structure as described above, the production setup cannot be simplified, and it is difficult to reduce the cost. The reason for this is as follows. That is, as shown in FIG. 8, in order to integrally combine the core metal 7, the sealing material 9 and the tone wheel 10 which is a permanent magnet, the core metal 7 and the tone wheel 10 are molded to form the sealing material 9. The sealing material 9 is injection-molded while being set in the cavity of the mold. The operation of magnetizing the tone wheel 10 must be performed after this injection molding. The reason for this is that, when magnetized before molding, the tone wheel 10 is attracted to the mold by its own magnetic force, and the tone wheel 10 alone or a seal formed in a state of being coupled with the tone wheel 10. This is because handling of the material 9 is troublesome.

Therefore, in order to realize the structure shown in FIG. 8, the work of magnetizing the tone wheel 10 must be performed after the injection molding of the seal material 9. For this purpose, a sealing material maker that injection-molds the sealing material 9 is provided with a facility cost for magnetizing, or the sealing material 9 molded in a state of being coupled with the tone wheel 10 is magnetized from the sealing material manufacturer. The tone wheel 10 must be magnetized by the magnet manufacturer.
In the case of the former, it is necessary to provide a magnetizing equipment which is not originally required by the seal maker, resulting in an increase in equipment cost and a cost increase. In the latter case, the unmagnetized tone wheel made by the magnet maker needs to be sent to the seal maker and then sent back to the magnet maker, which increases the transportation cost and also increases the cost.

The present invention has been made in view of the above circumstances, and it is possible to connect the tone wheel magnetized in advance by a magnet maker with a seal ring composed of a core material and a seal material, so that the equipment cost and the transportation cost can be improved. It is intended to suppress the cost increase due to the cost increase.

[0010]

A rolling bearing unit with a tone wheel according to the present invention has a fixed ring which has a fixed raceway surface on a fixed peripheral surface and does not rotate during use, like the conventional rolling bearing unit with a tone wheel described above. A rotary wheel that has a rotary raceway surface on the rotary circumferential surface and rotates when in use, and a plurality of rolling elements provided between the fixed raceway surface and the rotary raceway surface, and is formed into an annular shape as a whole. The mandrel supported by the rotating wheel and the S supported on the side surface of the mandrel over the circumferential direction.
And a tone wheel which is an annular multi-pole magnet in which poles and N poles are alternately arranged.

Particularly, in the rolling bearing unit with a tone wheel according to the present invention, the core metal is made of a magnetic material, and the tone wheel is magnetized on both axial side surfaces. The tone wheel is supported by the core metal by its own magnetic force.

[0012]

With the rolling bearing unit with a tone wheel of the present invention constructed as described above, the wheel is rotatably supported, and in combination with the sensor, the rotational speed of the wheel fixed to the rotating wheel is detected. The operation itself is the same as that of the rolling bearing unit with a tone wheel that constitutes the above-described conventional rolling bearing unit with a rotation speed detecting device.

In particular, in the case of the rolling bearing unit with a tone wheel of the present invention, the tone wheel is supported by the core metal by its own magnetic force. Therefore, the tone wheel pre-magnetized by the magnet manufacturer is used as the core of the seal ring. Can be combined with gold. Therefore, it is possible to suppress a cost increase due to an increase in equipment cost and transportation cost.

[0014]

1 to 3 show a first embodiment of the present invention. Contrary to the case of the conventional structure described above, the inner ring raceways 2 and 2 which are the rotary raceway surfaces are formed on the outer circumferential surface which is the rotary circumferential surface,
Inner rings 1 and 1, each of which is a rotating wheel, can be externally fitted to a rotating axle during use. An outer ring 14, which is a fixed ring that does not rotate during use, is arranged around each of the inner rings 1, 1 concentrically with the inner ring 1, 1. Then, between the outer ring raceways 4, 4 which are fixed raceway surfaces and the inner ring raceways 2, 2 which are formed on the inner circumferential surface of this outer ring 14 which is a fixed circumferential surface,
The outer ring 14 is provided by providing a plurality of balls 5 and 5 which are rolling elements.
The inner rings 1 and 1 are rotatably supported inside.

A combination seal 15 is provided between the inner end portion of the outer ring 14 and the outer peripheral surface of the inner end portion of the inner inner ring 1.
The inner end opening of the space existing between the inner peripheral surface of the outer ring 14 and the outer peripheral surface of the inner ring 1 is closed. The outer ring 1
Another combination seal 16 is provided between the outer end portion of the outer ring 4 and the outer peripheral surface of the inner end portion of the outer inner ring 1, and is present between the inner peripheral surface of the outer ring 14 and the outer peripheral surface of the inner ring 1. The outer end opening of the space is closed.

Of the two sets of combination seals 15 and 16, the combination seal 15 provided on the inner side includes a seal ring 17 externally fitted and fixed to the outer peripheral surface of the inner end portion of the inner ring 1 on the inner side. A seal ring 18 is fitted and fixed to the inner peripheral surface of the inner end portion of the outer ring 14. Of these two seal rings 17, 18, one seal ring 17 is a core metal 19 made of a magnetic metal plate such as a steel plate, which corresponds to the core metal described in the claims, and an elastic material such as rubber or elastomer. Sealing material 20 made of rubber, and a tone wheel 21 made of rubber magnet, in which ferromagnetic powder is mixed into rubber to form a ring shape as a whole.
It is composed of

The tone wheel 21 has S poles and N poles arranged alternately in the circumferential direction. Further, the tone wheel 21 has an axial direction (left and right directions in FIGS.
(Front and back direction) is magnetized. Therefore, the tone wheel 21 is magnetized on both axial side surfaces (both inner and outer side surfaces). Further, a step portion 22 is formed on the inner peripheral edge portion of the inner side surface of the tone wheel 21, and the thickness dimension of the inner peripheral edge portion is made smaller than the other portions.

The mandrel 19 includes a circular ring portion 23, a fitting cylindrical portion 24 bent outward from the outer peripheral edge of the circular ring portion 23 at a right angle, and an inner peripheral edge of the circular ring portion 23. And a holding cylinder portion 25 that is bent at a right angle toward the inside. The inner diameter of the holding cylinder portion 25 is the same as or slightly larger than the outer diameter of the tone wheel 21. Further, at a plurality of positions in the circumferential direction of the holding tubular portion 25 (preferably at three or more positions located at equal intervals in the circumferential direction), caulking portions 26 projecting inward in the diametrical direction are formed. The diameter of the maximum inscribed circle of the plurality of caulked portions 26 is smaller than the outer diameter of the tone wheel 21.

The tone wheel 21 has its own magnetic force on the inner surface of the circular ring portion 23 constituting the core metal 19 as described above.
The step portion 22 and the caulking portion 26 are engaged with each other to support the connection. That is, while the tone wheel 21 is elastically deformed, the inner peripheral edge portion of the tone wheel 21 is allowed to pass through the outside of each of the caulking portions 26, and the outer surface of the tone wheel 21 and the circular ring portion 23 are brought into close contact with each other. ing. In this state, the tone wheel 21 and the cored bar 19 are inseparably coupled by the magnetic attraction force acting between the two members 21, 19. Also, the tone wheel 21
The tone wheel 21 is concentrically held by the inner ring 1 based on the engagement between the outer peripheral edge of the inner ring 1 and the inner peripheral surface of the holding tubular portion 25.

On the other hand, a base portion of the sealing material 20 having a plurality of sealing lips 27, 27 is joined and fixed to the outer diameter side half portion of the circular ring portion 23 by baking, adhesion or the like. Further, of the pair of seal rings 17 and 18 constituting the combination seal 15, the other seal ring 18
And a base end portion of a sealing material 29 is provided on an inner peripheral edge portion of a cored bar 28 fitted and fixed to an inner peripheral surface of an inner end portion of the outer ring 14.
After all, they are bonded and fixed by baking, adhesion, etc. The tip edges of the respective seal lips 27, 27 are fitted to the inner side surface and the inner peripheral surface of the cored bar 28 constituting the other seal ring 18, and the inner peripheral edge of the sealing material 29 constitutes the cored bar 19. The outer peripheral surface of the coupling tube portion 24 is slidably contacted with each other.

The rolling bearing unit with a tone wheel of the present invention constructed as described above rotatably supports the axle for rotating the wheels inside the holding case 30 which constitutes the suspension device. In combination with the sensor 13 supported by 30, the inner ring 1, which is a rotating wheel,
1 or the rotational speed of the wheel is detected. Particularly, in the case of the rolling bearing unit with a tone wheel of the present invention, the tone wheel 21 is supported by the core metal 19 by its own magnetic force, and therefore the tone wheel 21 magnetized in advance by the magnet manufacturer.
Can be combined with a seal ring 17 made of a seal maker and comprising a core material 19 and a seal material 20. Therefore, it is possible to suppress a cost increase due to an increase in equipment cost and transportation cost.

In the illustrated embodiment, the sensor 13 that constitutes the rotation speed detecting device together with the tone wheel 10 is used.
Is installed in the holding case 30 outside the rolling bearing unit. However, this sensor 13 is fixed to the outer ring 1
You can also support 4.

Next, FIG. 4 shows a second embodiment of the present invention. In the case of the present embodiment, the permanent magnet tone wheel 21 is provided with the seal ring 17 only by its own magnetic attraction.
Is supported by being coupled to the inner side surface of the circular ring portion 23 of the cored bar 19 constituting the. Accordingly, in the case of the present embodiment, the size of the gap existing between the inner peripheral edge of the tone wheel 21 and the outer peripheral surface of the inner ring 1 is reduced, so that the center of the tone wheel 21 is aligned with the inner ring 1. It almost coincides with the center of. Therefore, in the case of this embodiment, unlike the above-described first embodiment, the holding cylinder portion 25 at the outer peripheral edge of the circular ring portion 23 and the step portion 22 (FIGS. 1 to 3) at the outer peripheral edge of the tone wheel 21 are also formed. I haven't. Further, in the case of the present embodiment, the inner end surface of the inner ring 1 is separated from the inner side surface of the tone wheel 21 corresponding to the fact that the tone wheel 21 and the circular ring portion 23 are coupled only by the magnetic attraction force. Is also protruding. The reason for this is to prevent the tone wheel 21 from being attracted to another magnetic article and coming off the cored bar 19 when the rolling bearing unit with a tone wheel is conveyed. In the case of this embodiment, the material of the tone wheel 21 is not particularly limited. It may be a rubber magnet or a plastic magnet in which magnetic powder is mixed in rubber or a synthetic resin, a general ferrite magnet, or a rare earth magnet having a large magnetic force. Other configurations and operations are similar to those of the above-described first embodiment.

Next, FIGS. 5 to 6 show a third embodiment of the present invention. In the case of this embodiment, the tone wheel 21 is
It is composed of a permanent magnet having no flexibility, such as a plastic magnet, a ferrite magnet, a rare earth magnet, and the step portion 22.
By engaging with the plurality of caulking portions 26, the core metal 19 and the tone wheel 21 are prevented from being separated from each other reliably. For this reason, in the case of the present embodiment, the same number of notches 31 as the caulking portions 26 are provided at a plurality of circumferential portions of the outer peripheral portion of the tone wheel 21 corresponding to the step portion 22, and the caulking portions 26 are formed. Are formed at an equal pitch. Each notch 31
Is large enough to pass through each caulking portion 26.

When the core metal 19 and the tone wheel 21 are joined together, as shown in FIG. 5, with the caulking portion 26 and the notch 31 aligned, the outer peripheral edge portion of the tone wheel 21. Through the caulking portion 26, and the outer surface of the tone wheel 21 and the inner surface of the circular ring portion 23 that constitutes the core metal 19 are brought into contact with each other. Then, the core metal 1
9 Tone wheel 21 a little (above caulking part 2
6 and the notch 31), the caulking portion 26 and the notch 31 are displaced from each other. The core metal 19 and the tone wheel 21 do not rotate relative to each other, unless an external force is applied, based on the magnetic attraction force acting between the two members 19, 21. As a result, the circular ring portion 23 is similar to FIGS.
Based on the engagement between the plurality of caulking portions 26 and the outer surface of the tone wheel 21 in addition to the magnetic attraction force acting between the tone wheel 21 and the tone wheel 21, separation between the members 19 and 21 is prevented. Other configurations and operations are the same as those of the first embodiment.

Next, FIG. 7 shows a fourth embodiment of the present invention. In the case of the present embodiment, among the pair of seal rings 17 and 18 constituting the combination seal 15, only the seal ring 18 to which the tone wheel 21 is not fixed is provided with the seal material 29 having the plurality of seal lips 32 and 32. It is stuck. The core metal 19 of the seal ring 17 to which the tone wheel 21 is fixedly connected is provided with the seal lips 32, 32.
Only the tip edge of the is slid, and no sealing material is attached to itself. Note that, for convenience of description, in the present specification, an annular member that does not have a sealing material in this way, but constitutes a combined seal in combination with another seal ring, is also referred to as a seal ring. Ring part 2 that constitutes the core metal 19
The tone wheel is coupled and supported on the inner side surface of 3 by a structure similar to that of the above-described first embodiment or the above-described third embodiment. It is the same as the above-described first embodiment or the above-mentioned third embodiment, except that the sealing material 29 is provided only on the seal ring 18 side.

In each of the illustrated embodiments, the present invention is applied to a structure in which the outer ring 14 is fixed and the inner rings 1 and 1 rotate, but the present invention is not limited to these illustrated embodiments. Conversely, the inner rings 1 and 1 may be fixed wheels, and the outer ring 14 may be a rotating wheel. Of course, in this case, the inner end portion of the outer ring corresponds to the core metal described in the claims,
Reverse the inner and outer directions across the diametrical direction, such as by fixing the core metal.

[0028]

Since the rolling bearing unit with a tone wheel according to the present invention is constructed and operates as described above, it can contribute to the reduction of the product cost by eliminating the need for extra equipment investment or extra transportation cost. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a view seen from the right side of FIG. 2;

FIG. 4 is a view similar to FIG. 2, showing a second embodiment of the present invention.

FIG. 5 is a view similar to FIG. 3 showing the third embodiment.

FIG. 6 is a sectional view of a tone wheel used in a third embodiment.

FIG. 7 is a view similar to FIG. 2, showing a fourth embodiment of the present invention.

FIG. 8 is a sectional view showing an example of a conventional structure.

[Explanation of symbols]

 1 Inner ring 2 Inner ring raceway 3 Hub 4 Outer ring raceway 5 Ball 6 Seal ring 7 Core metal 8 Cylindrical part 9 Seal material 10 Tone wheel 11 Holding ring 12 Seal lip 13 Sensor 14 Outer ring 15, 16 Combination seal 17, 18 Seal ring 19 Core metal 20 Sealing Material 21 Tone Wheel 22 Stepped Section 23 Circular Ring Section 24 Fitting Cylindrical Section 25 Holding Cylindrical Section 26 Caulking Section 27 Seal Lip 28 Core Bar 29 Sealing Material 30 Holding Case 31 Notch 32 Seal Lip

Claims (1)

[Claims] 1. A fixed wheel having a fixed raceway surface on a fixed circumferential surface that does not rotate during use, a rotary wheel having a rotary raceway surface on a rotary circumferential surface that rotates during use, the fixed raceway surface and the rotary raceway surface. A plurality of rolling elements provided between the mandrel, a mandrel that is formed in an annular shape as a whole and is supported by the rotating wheel, and an S pole that is supported on the side surface of the mandrel and that extends in the circumferential direction. In a rolling bearing unit with a tone wheel comprising a tone wheel which is an annular multi-pole magnet in which N poles and N poles are alternately arranged, the core metal is made of a magnetic material, and the tone wheel has axially opposite sides. A rolling bearing unit with a tone wheel, the surface of which is magnetized, and the tone wheel is supported by the core metal by its own magnetic force.