JPH0915254A - Rolling bearing unit with tone wheel - Google Patents

Abstract

PURPOSE: To make a tone wheel not to be damaged at a time when a seal ring holding this tone wheel is internally fitted in a hub. CONSTITUTION: As a permanent magnet constituting a tone wheel 14, this rolling bearing unit uses a compound material made up of dispersing ferromagnetic material powder in elastic materials including rubber and elastomer or the like. When a seal ring 12 is internally fixed to a hub 7, a jig is pressed to this tone wheel 14, and a cylindrical part 18 of a core bar 13a is thrust into the hub 7. In this time, a crack and any plastic deformation will not occur at all in the tone wheel made of elastic material.

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. 4,968,156 is conventionally known.

4 to 5 show a rolling bearing unit with a rotation speed detecting device described in this specification. Each is a fixed ring, joined by a joining ring 1 1
The pair of inner rings 2, 2 are fitted on the non-rotating axle 3. Then, between the holder 4 and the nut 5, both inner rings 2, 2
Is clamped and fixed. Inner ring raceways 6, 6 each serving as a first raceway surface are formed on the outer peripheral surface (first circumferential surface) of each inner race 2, 2 that is a fixed wheel.

Further, the hub 7 which is a rotating wheel that rotates during use.
On the inner peripheral surface (second peripheral surface) of the above, double-row outer ring raceways 8, 8 each of which is a second raceway surface are formed. And
A plurality of balls 9, 9 as rolling elements are provided between each outer ring raceway 8 and each inner ring raceway 6, 6 to rotatably support a hub 7 around the axle 3. There is. The wheel 10 of the wheel is fixed to a flange 11 provided on the outer peripheral surface of the hub 7.

Further, the inner end of the hub 7 (inside means the side closer to the center in the width direction when assembled to an automobile, as shown in FIG.
Right at ~ 5. Conversely, the side that is closer to the outside in the width direction of the vehicle is called the outside. ) At the opening, the core metal 1 that constitutes the seal ring 12 is formed.
3 is fitted and fixed. That is, the cylindrical portion 18 formed on the outer peripheral edge portion of the core metal 13 is fitted in the opening portion of the hub 7 with an interference fit. The tone wheel 14 is supported and fixed to the core metal 13. The tone wheel 14 is made 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 15 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 2, 2. The leading edge of the sealing material 16 constituting the seal ring 12 is brought into sliding contact with the inner peripheral surface and the outer surface of the retaining ring 15 to prevent dust and rainwater from entering the balls 9, 9 installation portion. ing. Further, a sensor 17 is supported and fixed to a part of the holding ring 15, and the sensor 1
The detection unit 7 faces the inner surface of the tone wheel 14.

In the case of the rolling bearing unit with the rotational speed detecting device as described above, the wheel fixed to the hub 7 can be rotatably supported on the axle 3 on which the inner rings 2 and 2 are fitted and supported. When the hub 7 rotates together with the wheels, the hub 7
The output of the sensor 17, which faces the side surface of the tone wheel 14 fixed to, changes. The frequency at which the output of the sensor 17 changes is proportional to the rotational speed of the wheel. Therefore, if the output signal of the sensor 17 is input to a controller (not shown), the rotation speed of the wheel can be obtained and ABS or TCS can be appropriately controlled. A rolling bearing unit with a rotation speed detecting device having substantially the same structure is disclosed in the above-mentioned US Pat. No. 4,968,815.
In addition to the specification No. 6, it is also described in the specification No. 4948277.

[0008]

However, in the case of the conventional structure as described above, the tone wheel 14 is easily damaged during the assembling work of the rolling bearing unit with the tone wheel which constitutes the rolling bearing unit with the rotation speed detecting device together with the sensor. This deteriorates the yield and increases the cost of the rolling bearing unit with a tone wheel. The reason for this is as follows. The core metal 13 supporting and fixing the tone wheel 14 must be internally fitted and fixed to the hub 7 with a sufficient fitting strength so as not to be displaced due to long-term use. Therefore, it is necessary to sufficiently increase the fitting strength between the outer peripheral surface of the cylindrical portion 18 formed on the outer peripheral edge of the core metal 13 and the inner peripheral surface of the hub 7. Therefore, when the cylindrical portion 18 is fitted in the hub 7, the seal ring 12 must be strongly pressed in the axial direction (left and right directions in FIGS. 4 to 5).

On the other hand, since the sealing material 16 which constitutes the sealing ring 12 is made thin by an elastic material such as rubber or elastomer, the portion covered with the sealing material 16 cannot be strongly pressed. This sealing material 16
When is strongly pressed, there is a possibility that the sealability becomes poor due to the occurrence of cracks and the like. Therefore, in the case of the conventional structure shown in FIGS. 4 to 5, when performing the above-mentioned inner fitting fixing work,
It is necessary to press the side surface of the tone wheel 14. When the internal fitting and fixing work is performed as described above, no particular problem occurs if the tone wheel 14 has sufficient strength, but it cannot be said that the tone wheel 14 has sufficient strength.

That is, the tone wheel 14 generally uses a permanent magnet made of a sintered material such as ferrite, but the permanent magnet made of the sintered material has poor toughness and is easily cracked when a strong force is applied. Further, even when the tone wheel 14 is a so-called plastic magnet in which a powder made of a ferromagnetic material such as ferrite is mixed in a synthetic resin, it is difficult to secure sufficient strength so that the tone wheel 14 is not broken during the internal fitting and fixing work. . Specifically, the synthetic resin may be cracked or plastically deformed based on the pressing force, and the accuracy of the rotation speed detection device incorporating the tone wheel 14 may be deteriorated. The rolling bearing unit with a tone wheel of the present invention has been invented in view of the above circumstances.

[0011]

A rolling bearing unit with a tone wheel according to the present invention has a first raceway surface on a first peripheral surface when in use, like the above-mentioned conventional rolling bearing unit with a tone wheel. A stationary wheel that does not rotate, a rotating wheel that has a second raceway surface on the second circumferential surface and that rotates during use, and a plurality of rolling wheels that are provided between the first raceway surface and the second raceway surface. The moving body, a sealing material made of an elastic material, and a core metal that reinforces the sealing material form an annular shape as a whole, and a cylindrical portion formed on the peripheral edge of the core metal is fitted to the second peripheral surface. The seal ring supported by the rotating wheel, and the S pole and the N pole, which are supported on the side surfaces of the seal ring, in the circumferential direction.
And a tone wheel which is an annular multi-pole magnet in which poles are alternately arranged. The leading edge of the sealing material is brought into sliding contact with the surface of the fixed ring or a member fixed to the fixed ring.

Particularly, in the rolling bearing unit with a tone wheel of the present invention, the tone wheel is made of rubber,
It is composed of a composite material in which a powder of a ferromagnetic material is dispersed in an elastic material such as an elastomer.

[0013]

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 conventional rolling bearing unit with a tone wheel described above.

In particular, in the rolling bearing unit with a tone wheel according to the present invention, when the seal ring supporting the tone wheel is fitted and fixed to the rotary wheel, the constituent parts of the seal ring are not damaged. That is, when the seal ring is fitted to the rotary wheel, the cylindrical portion can be fitted and fixed to the second peripheral surface by pressing the tone wheel supported on the side surface of the seal ring. At this time, the tone wheel made of an elastic material such as rubber or elastomer may be elastically deformed by the pressing force applied at the time of fitting, but is not cracked or plastically deformed. Also, no strong force is applied to the thin-walled sealing material made of elastic material. Therefore, the sealing material and the tone wheel are not damaged.

[0015]

FIG. 1 shows a first embodiment of the present invention.
Similar to the case of the conventional structure described above, the inner ring 2 which is the fixed ring, in which the inner ring raceway 6 which is the first raceway surface is formed on the outer circumferential surface which is the first circumferential surface, is the axle 3 that does not rotate during use (see FIG. 4). Refer to FIG. 1, but omitted). Around the inner ring 2, a hub 7 that is a rotating wheel that rotates during use.
(Or the outer ring. The same applies hereinafter) is arranged concentrically with the inner ring 2. And an outer ring raceway 8 which is a second raceway surface formed on the inner circumferential surface of the hub 7 which is the second circumferential surface,
A plurality of balls 9 as rolling elements are provided between the inner ring raceway 6 and the inner ring raceway 6 to rotatably support the hub 7 around the inner ring 2.

At the inner end of the hub 7 is a seal ring 1
A cored bar 13a forming 2a is fitted and fixed. The cored bar 13a is formed into an annular shape with an L-shaped cross section, and the outer peripheral edge of the ring-shaped main portion 19 is bent at a right angle inward (to the right in FIG. 1) to form the hub 7 described above. A cylindrical portion 18 for internal fitting and fixing is formed on the inner end portion of the.

A sealing material 16 made of an elastic material is fixed to the inner peripheral edge of the main portion 19 by baking or the like. The inner peripheral edge portion of the sealing material 16 is formed into a bifurcated portion to form a pair of seal lips 20, 20. Then, the inner peripheral edge of each of the seal lips 20, 20 is brought into sliding contact with the outer peripheral surface of the inner end portion of the inner ring 2 to seal the inner end side opening portion of the rolling bearing unit. Further, a ring-shaped tone wheel 14 is supported and fixed to the inner surface of the main portion 19 by adhesion, baking, or the like. This tone wheel 14
Is a ring-shaped permanent magnet (multi-pole magnet) made of a composite material in which a powder of a ferromagnetic material is dispersed in an elastic material such as rubber or elastomer. N poles are arranged alternately and at equal intervals.

By the rolling bearing unit with a tone wheel of the present invention constructed as described above, the wheel is rotatably supported around the non-rotating axle 3, and the sensor 17 is also provided.
(See FIGS. 4 to 5; omitted in FIG. 1). The action itself when detecting the rotation speed of the wheel fixed to the hub 7 or the outer ring, which is a rotating wheel, is the same as in FIGS. This is similar to the conventional rolling bearing unit with a tone wheel shown.

Particularly, in the rolling bearing unit with a tone wheel according to the present invention, when the seal ring 12a is fitted and fixed to the hub 7 which is a rotating wheel, the constituent parts of the seal ring 12a are not damaged. That is, this seal ring 1
When fitting the 2a to the hub 7, the tone wheel 14 supported on the side surface of the seal ring 12a is pressed to allow the cylindrical portion 18 to be fitted and fixed to the inner peripheral surface of the hub 7. At this time, the tone wheel 14, which is a permanent magnet made of an elastic material such as rubber or elastomer, may be elastically deformed by the pressing force applied at the time of fitting, but is not cracked or plastically deformed. . Also, no strong force is applied to the thin sealing material 16 made of an elastic material. Therefore, the sealing material 16 and the tone wheel 14 are not damaged.

In the illustrated embodiment, the sensor 17 that constitutes the rotation speed detecting device together with the tone wheel 14 is used.
(FIGS. 4 to 5) are installed outside the rolling bearing unit such as a suspension device. However, like the conventional structure shown in FIGS. 4 to 5, the sensor 17 can be supported by the inner ring 2 which is a fixed ring. In this case, the seal lips 20 and 20 are provided with a retaining ring 15 for supporting the sensor 17.
It is also possible to make sliding contact with a part of (Figs. 4 to 5).

Next, FIG. 2 shows a second embodiment of the present invention. In the case of the present embodiment, the seal material 16 constituting the seal ring 12b is integrally coupled not only to the inner peripheral edge portion of the core metal 13a but also to the inner peripheral surface and the outer peripheral surface of the tone wheel 14. ing. Other configurations and operations are similar to those of the above-described first embodiment.

Next, FIG. 3 shows a third embodiment of the present invention. In the case of the present embodiment, not only the inner peripheral edge portion of the core metal 13a constituting the seal ring 12c but also the inner side surface portion of the main portion 19 is covered with the sealing material 16. The tone wheel 14 is supported on the inner surface of the main portion 19 via the sealing material 16. Since the tone wheel 14 and the seal material 16 are made of the same kind or a similar kind of elastic material, the two members 14 and 16 are reliably bonded and fixed to each other. Therefore, even if it is used for a long period of time, the joint surface between the two members 14 and 16 will not be separated. Further, since the amount of thermal expansion based on the temperature change is the same, the joint surface will not be separated even if the temperature change is repeated.

In each of the illustrated embodiments, the present invention is applied to the structure in which the inner ring 2 is fixed and the hub 7 is rotated. However, the present invention is the reverse of these illustrated embodiments. To
It is also possible to use the hub as a fixed ring and the outer ring raceway provided on the inner circumferential surface of the hub, which is the first circumferential surface, as the first raceway surface. In this case, the inner ring is the rotating ring, and the inner ring raceway provided on the outer circumferential surface of the inner ring, which is the second circumferential surface, is the second raceway surface. Further, in accordance with this, the inner and outer directions in the diametrical direction are reversed by, for example, externally fitting and fixing a core metal forming a seal ring to the inner end portion of the inner ring. Further, in each of the embodiments, the tip edge of the cylindrical portion 18 forming the core metal 13a is projected more inward than the inner side surface of the tone wheel 14, but, conversely, the tip edge of the cylindrical portion 18 is made larger than that. It is also possible to project the inner surface of the tone wheel 14 inward.

[0024]

Since the rolling bearing unit with a tone wheel of the present invention is constructed and operates as described above, the seal material and the tone wheel are not damaged during the assembling work, the yield is improved and the product cost is improved. It can contribute to cost reduction.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of an essential part showing the second embodiment.

FIG. 3 is a sectional view of an essential part showing the third embodiment.

FIG. 4 is a sectional view showing an example of a conventional structure.

5 is an enlarged view of part A in FIG.

[Explanation of symbols]

 1 Coupling Ring 2 Inner Ring 3 Axle 4 Holder 5 Nut 6 Inner Ring Orbit 7 Hub 8 Outer Ring Orbit 9 Ball 10 Wheel 11 Flange 12, 12a, 12b, 12c Seal Ring 13, 13a Core Bar 14 Tone Wheel 15 Holding Ring 16 Sealing Material 17 Sensor 18 Cylindrical part 19 Main part 20 Seal lip

Claims (1)

[Claims] 1. A stationary wheel having a first raceway surface on a first circumferential surface and not rotating during use, and a rotating wheel having a second raceway surface on a second circumferential surface and rotating during use, A plurality of rolling elements provided between the first raceway surface and the second raceway surface, a sealing material made of an elastic material, and a core metal that reinforces the sealing material, and is formed into an annular shape as a whole. By fitting the cylindrical portion formed on the peripheral edge of the gold to the second peripheral surface, the seal ring supported by the rotary wheel and the circumferential direction supported by the side surface of the seal ring are arranged. In a rolling bearing unit with a tone wheel including a tone wheel which is a ring-shaped multi-pole magnet in which S poles and N poles are alternately arranged, the tone wheel includes a ferromagnetic material powder in an elastic material. Rolling bearing unit with tone wheel characterized by being composed of dispersed composite materials To