JP3491394B2 - Rolling bearing unit with tone wheel - Google Patents

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 Antilock brake system (AB
S) or Traction Control System (TCS)
In order to control, it is necessary to detect the rotation speed of the wheels. Therefore, in order to rotatably support the wheel with respect to the suspension device and detect the rotation speed of the wheel, a rolling bearing unit with a rotation speed detection device is required. 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.

3 to 4 show a rolling bearing unit with a rotation speed detecting device described in this specification. A pair of inner races 2, 2 each of which is a fixed raceway, which are joined by a joint ring 1, are fitted onto a 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 are respectively formed as first raceway surfaces on the outer peripheral surfaces (first circumferential surfaces) of the inner races 2, 2 which are fixed raceways, respectively.

Further, it is a rotary bearing ring that rotates during use,
The inner peripheral surface (second peripheral surface) of the hub 7 which is also the outer race ring
Has a plurality of rows of outer ring raceways 8, 8 each of which is a second raceway surface. A plurality of balls 9 and 9 as rolling elements are provided between the outer ring raceways 8 and 8 and the inner ring races 6 and 6, and the hub 7 is provided around the axle 3.
It is rotatably supported. 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 (corresponding to one end of the claims. The inner side means the side closer to the center in the width direction when assembled to an automobile, and the right side in FIGS. The outside of the vehicle in the width direction is called the outside.)
A core metal 13 forming the seal ring 12 is fitted and fixed inside. That is, the cylindrical portion 1 formed on the outer peripheral edge of the core metal 13
8 is fitted in the opening 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 rotation speed detecting device as described above, the wheels 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 wheel rotation speed. 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 described in the specification No. 4948277, French Patent Publication No. 2642482, and the like.

[0008]

However, in the case of the conventional structure as described above, the width dimension W ₁₄ across the diameter of the tone wheel 14 cannot be made sufficiently large, and as a result, the sensor 17 is formed.
There is a possibility that the density of the magnetic flux existing in the part cannot be secured sufficiently. That is, in the case of the conventional structure shown in FIGS. 3 to 4, the tone wheel 14 is arranged between the inner peripheral surface of the inner end portion of the hub 7 and the outer peripheral surface of the inner end portion of the inner ring 2. Therefore, in consideration of prevention of interference between the tone wheel 14 and the core metal 13 and the retaining ring 15, the width dimension W ₁₄ is the opening portion 19 existing between the inner peripheral surface of the inner end portion and the outer peripheral surface of the inner end portion. It is considerably smaller than the width dimension W ₁₉ (W ₁₄ << W ₁₉ ).

If the width W ₁₄ of the tone wheel 14 which is a permanent magnet becomes small, it becomes difficult to sufficiently increase the magnetic force of the tone wheel 14, and the density of the magnetic flux emitted from the tone wheel 14 becomes low. The sensor 1
The density of the magnetic flux existing in the 7th part becomes low. When the density of the magnetic flux existing in the sensor 17 portion becomes low as described above, the detection signal output from the sensor 17 becomes low as the wheel rotates, and it becomes difficult to ensure the accuracy of wheel speed detection.
The rolling bearing unit with a tone wheel of the present invention has been invented in view of the above circumstances.

[0010]

A toe according to claim 1 of the rolling bearing unit with a tone wheel according to the present invention.
A rolling bearing unit with down wheel, like the rolling bearing unit with a conventional tone wheel described above, the fixed bearing ring that the first circumferential surface does not rotate during use has a first raceway surface, the second peripheral surface A rotating race ring having a second raceway surface for rotation during use, a plurality of rolling elements provided between the first raceway surface and the second raceway surface, and formed in an annular shape as a whole. And a sealing device for closing one end opening of the space between the first and second peripheral surfaces, and a circumferential direction supported by a side surface of an annular member forming the sealing device. Therefore, a tone wheel, which is an annular multi-pole magnet in which S poles and N poles are alternately arranged, is provided.

Particularly, in the rolling bearing unit with a tone wheel according to claim 1, of the annular member, a portion provided with a side surface for supporting the tone wheel.
The minute portion is provided in a state of protruding from the one end opening of the above space to the outside of this space. And, the outer diameter of the tone wheel is larger than the inner diameter of the one end opening of the outer bearing ring provided diametrically outward among the the fixed bearing ring and the rotating bearing ring, and, of the tone wheel The inner diameter is smaller than the inner diameter of the one end opening of the outer race.
A rolling bearing unit with a tone wheel according to claim 2 has an inner ring which has an inner ring raceway on its outer peripheral surface and does not rotate during use, an outer ring which has an outer ring raceway on its inner peripheral surface and which rotates during use, and this outer ring raceway. And a plurality of rolling elements provided between the inner ring raceway and the inner ring raceway, and a sealing device that closes an end opening of a space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. This sealing device has a cylindrical portion and a circular ring-shaped main portion, of which the cylindrical portion is fitted to the outer ring, and the inner ring is attached to the inner peripheral edge of the main portion. Oh those made on the outer peripheral surface from the sliding contact seal lip
It Furthermore, an annular multi-pole magnet, which is supported on the side surface of the main portion and has S poles and N poles arranged alternately in the circumferential direction ,
A tone wheel has a part of the opening at the end of the space.
In the axial direction, and
With the entire wheel protruding outside this space,
It is provided on the side of the main part .

[0012]

When the rolling bearing unit with a tone wheel of the present invention constructed as described above is used to rotatably support the wheel and also to detect the rotational speed of the wheel fixed to the rotary raceway wheel in combination with the sensor. The action itself is the same as that of the conventional rolling bearing unit with a tone wheel described above.

In particular, in the case of the rolling bearing unit with a tone wheel of the present invention, the width dimension of the tone wheel in the diameter direction can be made sufficiently large. As a result, the density of the magnetic flux existing in the sensor portion can be increased and the output of this sensor can be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention corresponding to claims 1 and 2 . As in the case of the conventional structure described above, the inner races 2 and 2 that are fixed raceways, in which the inner raceways 6 and 6 that are the first raceways, respectively, are formed on the outer circumferential surface that is the first circumferential surface, respectively. It can be externally fitted to the axle 3 (see FIG. 3, not shown in FIG. 1) that does not rotate during use. A hub 7 (or an outer ring; hereinafter the same) that is a rotating ring that rotates during use around each of the inner rings 2, 2.
Are arranged concentrically with the inner rings 2, 2. Then, between the double-row outer ring raceways 8 and 8 formed on the inner circumferential surface of the hub 7 which is the second circumferential surface and each of which is the second raceway surface, and the inner ring raceways 6 and 6 described above. A plurality of balls 9, 9 each of which is a rolling element are provided to rotatably support the hub 7 around each of the inner rings 2, 2.

In the case of a rolling bearing unit for an automobile, which is heavy in weight, taper rollers may be used as the rolling elements instead of the balls 9, 9. In the case of the illustrated embodiment, the balls 9, 9 arranged in each row of tracks are attached to the cage 2.
It is held rollable by 0 and 20. In addition, locking grooves 21 and 21 formed on the outer peripheral surfaces of the inner rings 2 and 2, and locking protrusions 22 formed on the inner peripheral surfaces of the cages 20 and 20,
22 are engaged with each other. Due to this engagement, even if the coupling ring 1 (FIG. 3) provided in the above-described conventional structure is omitted, each inner ring 2, 2 is mounted before being mounted on the axle 3.
Are prevented from separating.

Further, a core metal 13a which constitutes a seal ring 12a is fitted and fixed to the inner end portion of the hub 7 so that the hub 7
2 existing between the inner peripheral surface of the vehicle and the outer peripheral surfaces of the inner rings 2 and 2
The inner end opening of 7 is closed. The core metal 13a, which is an annular member, is formed in an annular shape with a substantially J-shaped cross section, and the outer peripheral edge of the ring-shaped main portion 23 is outward (left side in FIG. 1).
By bending it at a right angle to, a cylindrical portion 18a for external fitting and fixing is formed on the inner end portion of the hub 7.

Further, the inner peripheral edge of the main portion 23 is slightly bent outward to form a bent edge 24, and the sealing material 16 made of an elastic material is fixed to the inner peripheral edge of the bent edge 24 by baking or the like. is doing. The inner peripheral edge portion of the sealing material 16 is formed into a bifurcated shape, and a pair of seal lips 25a, 25
b. Then, each of these seal lips 25a,
The inner peripheral edge of 25b 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. The seal lip 25 existing on the opening side
The outer peripheral surface of a is held down by a holding ring 26 to ensure sufficient sealing performance between the inner peripheral edge of the seal lip 25a and the outer peripheral surface of the inner ring 2. On the other hand, a core metal 13b forming a seal ring 12b is fitted and fixed to the outer end of the hub 7, and the seal ring 12b closes the outer end opening of the space 27. This seal ring 12b
Since it has nothing to do with the gist of the present invention, detailed description will be omitted.

Further, a ring-shaped tone wheel 14a is supported and fixed to the inner surface of the main portion 23 by adhesion or the like. This tone wheel 14a is a permanent magnet (multi-pole magnet)
Is formed into an annular shape, and S poles and N poles are alternately arranged at equal intervals in the circumferential direction. Outer diameter D _14a of the tone wheel 14a is larger than the inner diameter R ₇ of the inner end opening of the hub _{7 (D 14a> R 7)} . Further, the inner diameter R _14a of the tone wheel _14a is determined by the hub 7
_Is smaller than the inner diameter R _{7 of the} opening at one end (R _14a <R
₇ ).

By the rolling bearing unit with a tone wheel of the present invention constructed as described above, the wheel is rotatably supported around the axle 3 which does not rotate and the sensor 17 is provided.
(See FIGS. 3 to 4; omitted in FIG. 1) The action itself when detecting the rotation speed of the wheel fixed to the hub 7, which is the rotating ring, is shown in FIGS. This is similar to the conventional rolling bearing unit with a tone wheel.

In particular, in the case of the rolling bearing unit with a tone wheel of the present invention, the width dimension W _14a across the diameter of the tone wheel 14a can be made sufficiently large. That is, the width dimension can be made sufficiently large regardless of the width dimension W ₂₇ of the inner end opening of the space 27. As a result, the magnetic strength of the tone wheel 14a, which is a permanent magnet, is increased, the density of the magnetic flux exiting from the tone wheel 14a and present in the sensor 17 portion is increased, and the output of the sensor 17 can be improved.

Next, FIG. 2 shows a second embodiment of the present invention, which corresponds only to claim 1. In the case of this embodiment, the inner races 2 and 2 are rotary race rings, and the outer race 28 is a fixed race ring and an outer race ring. This outer ring 28 is
It is held and fixed inside a bearing box (not shown). Further, in the case of the present embodiment, each of the sealing devices for closing the inner end opening of the space 27 existing between the inner peripheral surface of the outer ring 28 and the outer peripheral surfaces of the inner rings 2, 2 has an annular shape. This is a so-called combined seal composed of the formed seal ring 12c and the retaining ring 15a. The tip edges of the seal lips 25a and 25b of the seal material 16 that constitutes the seal ring 12c are in sliding contact with the holding ring 15a. In the case of this embodiment using such a set seal, the holding ring 15a is an annular member that constitutes a sealing device. Tone wheel 14a
Is supported and fixed to the inner side surface of the circular ring portion 29 constituting the holding ring 15a by adhesion or the like. Therefore, also in the case of the present embodiment, the width dimension W _14a of the tone wheel 14a in the diametrical direction is made sufficiently large so that the sensor 17 (see FIG.
It is possible to improve the output of 4).

In the case of the embodiment shown in FIG. 2, the core bar 13c of the seal ring 12c constituting the above-mentioned seal is fitted in the outer ring 28 and the retaining ring 15a is fitted in the inner ring 2. Then, the leading edge 30 of the core metal 13c and the retaining ring 15a
The leading edge 31 of the above is located on the same plane.
When these two members 13c and 15a are fitted to the outer ring 28 or the inner ring 2, respectively, the pressing flat surfaces of the pressing jigs are abutted against the both end edges 30 and 31, so that both the members 13c and 15a.
Press a at the same time. Therefore, both these members 13c, 1
The positional relationship between the 5a can be accurately regulated as desired. or,
The minute gap 32 continuing from the both tip edges 30, 31 is
It functions as a labyrinth seal portion and prevents foreign matter such as muddy water from entering the sliding contact portions of the seal lips 25a and 25b. Further, the tip edge 30 of the core metal 13c and the retaining ring 15
Since the front end edge 31 of a is located on the same plane, and the tone wheel 14a is covered with the cylindrical surface of the core metal 13c, the tone wheel 14a is not prepared during transportation or assembly work. It is difficult for other items to hit. Therefore, the tone wheel 14a is less likely to be damaged or the mounting position is displaced.

[0023]

Since the rolling bearing unit with a tone wheel of the present invention is constructed and operates as described above, it is possible to increase the output of the sensor and contribute to the improvement in the reliability of wheel rotation speed detection.

[Brief description of 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 showing an example of a conventional structure.

FIG. 4 is an enlarged view of part A in FIG.

[Explanation of symbols]

1 coupling ring 2 inner ring 3 axles 4 holder 5 nuts 6 Inner ring track 7 hub 8 Outer ring track 9 balls 10 wheels 11 flange 12, 12a, 12b, 12c Seal ring 13, 13a, 13b, 13c Core bar 14, 14a tone wheel 15, 15a retaining ring 16 Seal material 17 sensors 18, 18a Cylindrical part 19 opening 20 cage 21 Locking groove 22 Locking protrusion 23 Main part 24 Folded edge 25a, 25b Seal lip 26 restraining ring 27 spaces 28 outer ring 29 Circle part 30, 31 Tip edge 32 minute gap

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01P 3/487 B60T 8/00 F16C 41/00

Claims (2)

(57) [Claims] 1. A fixed bearing ring which has a first raceway surface on a first circumferential surface and does not rotate during use, and a rotary bearing ring which has a second raceway surface on a second circumferential surface and rotates during use. , A plurality of rolling elements provided between the first raceway surface and the second raceway surface,
A seal device that has a seal ring formed entirely in an annular shape and closes one end opening of the space between the first and second peripheral surfaces, and is supported by a side surface of an annular member that constitutes the seal device. Further, in a rolling bearing unit with a tone wheel, comprising a tone wheel that is an annular multi-pole magnet in which S poles and N poles are alternately arranged in the circumferential direction, The side that supports the tone wheel above
The portion provided with is provided in a state of protruding from the one end opening of the space to the outside of the space, and the outer diameter dimension of the tone wheel is diametrically outward from the fixed raceway ring and the rotary raceway ring. Roller with a tone wheel, characterized in that it is larger than the inner diameter of the one end opening of the outer race ring provided on the above, and the inner diameter dimension of the tone wheel is smaller than the inner diameter dimension of the one end opening of the outer race ring. Bearing unit. 2. An inner ring which has an inner ring raceway on its outer peripheral surface and does not rotate during use, an outer ring which has an outer ring raceway on its inner peripheral surface and rotates during use, and which are provided between this outer ring raceway and the inner ring raceway. A plurality of rolling elements and a sealing device for closing an end opening of a space existing between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring are provided. The sealing device includes a cylindrical portion and a circular ring-shaped main portion. And
Having an annular member of which the cylindrical portion is externally fitted to the outer ring, and a seal lip that is attached to the inner peripheral edge of the main portion and is in sliding contact with the outer peripheral surface of the inner ring, and S is supported on the side surface of the above main part and extends in the circumferential direction.
A multi-pole magnet having an annular shape in which poles and N poles are alternately arranged
A part of the wheel is axial in the end opening of the space.
Direction overlap, and this tone
With the whole eel protruding outside this space,
Rolling bearing unit with a tone wheel provided on the side .