JP2003130075A - Rolling bearing unit with tone wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing unit with a tone wheel capable of preventing the axial deformation in the flange of a core bar and reducing severity requiring dimensional accuracy and assembling accuracy of a magnetic sensor or parts for supporting and fixing a magnetic sensor. SOLUTION: The rolling bearing unit with a tone wheel is provided with an outer ring 7, an inner ring 5 oppositely arranged through a plurality of balls in the outer ring 7, a core bar 33 having a cylindrical part 31 press-fitted in the inner ring 5, and a flange 32 radially extending from the end of the cylindrical part 31, and an annular tone wheel 34 attached to one side face of the flange 32 in a state that the circumferentially magnetized direction is alternately changed. A reinforcing rib 35 preventing the flange 32 from axially deforming when the inner cylindrical part 31 of the core bar 33 is press fitted in the inner ring 5 by a press-fitting instrument 15, is provided in the flange 32 of the core bar 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing unit with a tone wheel, and more particularly to a magnetic encoder for rotatably supporting an automobile wheel with respect to a suspension device and detecting the rotational speed of the wheel. The present invention relates to a rolling bearing unit with a tone wheel.

[0002]

2. Description of the Related Art FIG. 14 shows a bearing unit for an automobile wheel, in which a hub 2 is externally fitted and fixed to an axle 1, and a tone wheel is provided between a cylindrical portion 3 of the hub 2 and a mounting housing 4. A rolling bearing unit 9 is provided. The rolling bearing unit 9 with a tone wheel includes two rows of inner rings (rotating side raceway members) 5, which are fitted onto the cylindrical portion 3 of the hub 2.
5, an outer ring (stationary side race member) 7 externally fitted to the two rows of inner rings 5, 5 via balls 6 as rolling elements, and a plurality of balls 6 can be rolled at substantially equal intervals in the circumferential direction. And a holder 8 for holding the holder.

At the inner end portion (the end portion on the center side in the vehicle width direction) of the inner race 5 which is the rotation side race member, an antilock brake system (ABS), a traction control system (TCS), etc. of an automobile are provided. The tone wheel 14 of the magnetic encoder 10 for detecting the rotational speed of the wheel required for the control is attached. As shown in FIG. 15A, the magnetic encoder 10 includes a cylindrical portion 11 and an inner portion of the cylindrical portion 11 which are externally fitted to the inner end portion (the right end portion in the drawing) of the inner ring 5. A core bar 13 having a flange portion 12 extending outward in the radial direction from one end portion;
A ring-shaped tone wheel 14 which is adhered to one surface of the flange portion 12 facing the center side in the vehicle width direction and in which S poles and N poles are alternately arranged along the circumferential direction, and a magnetic sensor arranged in the mounting housing 4. 16 and 16.

Then, the tone wheel 14 side of the flange portion 12 is axially pressed by a press-fitting jig 15 so that the cylindrical portion 11 of the cored bar 13 is firmly press-fitted to the inner end portion of the inner ring 5. It has become so. As the tone wheel 14, a so-called plastic magnet in which a ferromagnetic material such as ferrite is mixed with a sintered body such as ferrite or a synthetic resin is used, but recently, rubber or the like is used from the viewpoint of protecting the tone wheel during press fitting. An elastic material mixed with a ferromagnetic powder such as ferrite is used.

Then, as shown in FIG. 14, the tone wheel 14 is rotated by a detecting portion of a magnetic sensor 16 which is arranged facing the mounting housing 4 with a predetermined air gap from the tone wheel 14. The rotational speed of the wheels is calculated by detecting the periodical change in the magnetic field in the circumferential direction due to the above, and performing arithmetic processing in the arithmetic unit of the control device (not shown) based on the detection signal.

[0006]

However, the core metal 13 in the conventional rolling bearing unit 9 with a tone wheel as described above has the above-mentioned flange when the cylindrical portion 11 is press-fitted into the inner end portion of the inner ring 5. The portion 12 is strongly pressed by the press-fitting jig 15 in the axial direction from the tone wheel 14 side. Therefore, as shown in FIG.
The flange portion 12 of the core metal 13 is deformed in the axial direction by the pressing force of 5, and the axial movement amount between the cylindrical portion 11 and the flange portion 12 of the core metal 13 is different, and the bearing at the detection diameter of the tone wheel 14 is used. It becomes difficult to obtain an accurate axial press-fitting position for the component.

If there is a large variation in the press-fitting position in the axial direction with respect to the bearing component due to the detection diameter of the tone wheel 14, there is a limit to the air gap at which the rotational speed can be reliably detected by the magnetic sensor 16, so the magnetic sensor 16 Also, there is a problem that the dimensional accuracy and the assembly accuracy of the parts that support and fix the magnetic sensor 16 become strict, and the manufacturing cost of the wheel bearing unit increases.

Further, as shown in FIG. 16, the lip portion of the seal ring 17 fitted in the outer ring 7 is used as a core metal to which the tone wheel 14 is adhered in order to achieve waterproofing in the bearing and sealing of grease. Also in the rolling bearing unit with a tone wheel using the slinger 19 with which the 18 slidably contacts, the axial movement amounts of the cylindrical portion 11 and the flange portion 12 are different, and an accurate shaft for the bearing component at the detection diameter of the tone wheel 14 is provided. The same problem as that of the cored bar 13 arises in that it is difficult to obtain the press-fitted position in the direction.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, and to suppress the axial deformation of the flange portion of the cored bar, the dimensional accuracy and assembly of the magnetic sensor and the parts for supporting and fixing the magnetic sensor. It is an object of the present invention to provide a rolling bearing unit with a tone wheel that can reduce the strictness required for accuracy.

[0010]

The above object of the present invention is to provide a stationary raceway member, a rotating raceway member which is disposed opposite to the stationary raceway member via a plurality of rolling elements, and the rotating raceway member. A core having a cylindrical portion to be press-fitted into and a flange portion extending in the radial direction from the end of the cylindrical portion, and one side of the flange portion with the magnetizing direction alternately changed along the circumferential direction. A rolling bearing unit with a tone wheel equipped with an attached annular tone wheel, wherein the flange portion is axially deformed when the cylindrical portion of the core metal is press-fitted into the rotation side race member. The deformation preventing means for preventing is provided by the rolling bearing unit with a tone wheel, which is provided on the core metal.

According to the above construction, the flange portion of the core metal on which the tone wheel is mounted is provided with the deformation preventing means for increasing the rigidity and preventing the deformation in the axial direction, and the cylindrical portion of the core metal. When press-fitting and fixing the shaft member to the rotation-side track member, it is difficult for the flange portion to be deformed in the axial direction due to the pressure input. Therefore,
It becomes easy to obtain an accurate axial position with respect to the bearing component at the detection diameter of the tone wheel press-fitted and fixed to the rotary side race member, and it is possible to reduce axial position variation with respect to the bearing component of the tone wheel.

Preferably, the deformation preventing means is a reinforcing rib formed on the flange portion to enhance bending rigidity. In this case, a plurality of linear ribs extending radially along the radial direction of the flange portion and reinforcing ribs such as circular ribs arranged concentrically with respect to the central axis of the flange portion are integrally formed by press molding or the like. By forming, the bending rigidity of the flange portion can be easily increased.

Further, preferably, the deformation preventing means comprises a jig abutting portion which is formed at an end portion of the cylindrical portion and which a press-fitting jig abuts. In this case, since the core metal can be press-fitted and fixed to the rotary side track member in a state where the press-fitting jig is in contact with the jig contacting portion formed at the end of the cylindrical portion, the press-fitting force is applied to the flange portion. Does not act directly, preventing deformation.

Further, the core metal may be configured as a slinger slidably contacting a lip portion of a seal ring fitted to the stationary side race member or a core metal of a seal ring fitted to the rotary side race member. You can Preferably, the material of the core metal is a magnetic steel material such as magnetic stainless steel.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a rolling bearing unit with a tone wheel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Since the rolling bearing unit with a tone wheel in this embodiment is arranged in a bearing unit for a wheel of an automobile, like the conventional rolling bearing unit with a tone wheel 9 shown in FIG.
Similar components are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 1 to 3, the rolling bearing unit 29 with a tone wheel according to the first embodiment of the present invention has two rows of inner rings (rotating side) fitted on the cylindrical portion 3 of the hub 2. (Race member) 5, 5 and an outer ring (stationary side race member) externally fitted to two rows of inner rings 5, 5 via balls 6 as rolling elements.
7 and a retainer 8 that holds a plurality of balls 6 so as to be rollable in the circumferential direction at substantially equal intervals.

At the inner end portion (end portion on the center side in the vehicle width direction) of the inner ring 5 which is the rotation side race member, an antilock brake system (ABS), a traction control system (TCS), etc. of an automobile are provided. A tone wheel 34 is attached to the magnetic encoder 30 for detecting the rotational speed of the wheel that is required when performing control.

As shown in FIG. 2, the magnetic encoder 30 includes a cylindrical portion 31 and an inner portion of the cylindrical portion 31 which are fitted on the inner end portion (the right end portion in the drawing) of the inner ring 5. Mandrel 3 having a flange portion 32 extending radially outward from one end portion
3, a ring-shaped tone wheel 34, which is adhered to one surface of the flange portion 32 facing the vehicle width direction center side and in which S poles and N poles are alternately arranged along the circumferential direction, and the mounting housing 4. And a magnetic sensor 16. The core metal 3
3 is preferably made of a magnetic steel material such as magnetic stainless steel. The tone wheel 34 is made by mixing an elastic material such as rubber with a ferromagnetic powder such as ferrite.

The flange portion 32 of the core metal 33 is provided with a plurality of reinforcing ribs 35, which are deformation preventing means, on the surface opposite to the surface to which the tone wheel 34 is adhered, which is a deformation preventing means. There is. The reinforcing rib 35
3, extend from the base end of the flange portion 32 toward the front end side and are arranged at substantially equal intervals in the circumferential direction. Therefore, the flange portion 32 provided with the reinforcing ribs 35 has an increased rigidity in the axial direction, and the flange portion 32 is press-fitted so that the cylindrical portion 31 of the cored bar 33 is externally fitted and fixed to the inner end portion of the inner ring 5. When pressed in the axial direction by the jig 15, deformation in the axial direction is suppressed.

Therefore, since the core metal 33 only needs to consider the deformation of the tone wheel 34 due to the pressure input, it becomes easy to obtain an accurate axial press-fitting position for the bearing component within the detection radius of the tone wheel 34. As a result, the variation in the axial press-fitting position of the tone wheel 34 with respect to the bearing component is reduced. As a result, the strictness required for the dimensional accuracy and the assembly accuracy of the magnetic sensor 16 and the mounting housing 4 that supports and fixes the magnetic sensor 16 is reduced, and the manufacturing cost of the bearing unit can be reduced.

FIG. 4 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to a second embodiment of the present invention. The tone wheel 44 in the magnetic encoder 40 is shown in FIG.
Is attached. This magnetic encoder 40 is
A cored bar 43 having a cylindrical portion 41 fitted onto the inner end portion of the inner ring 5 and a flange portion 42 extending radially outward from the end portion of the cylindrical portion 41 facing the center side in the vehicle width direction, and the flange portion 42. An annular tone wheel 44, which is adhered to one surface of the vehicle facing the center side in the vehicle width direction and has S poles and N poles alternately arranged along the circumferential direction, and a magnetic sensor (not shown).

On the outer peripheral end of the flange portion 42 of the cored bar 43, a short cylindrical portion 45 as a deformation preventing means is provided by, for example, press molding. The short cylindrical portion 45
Is formed by bending the outer peripheral end of the flange portion 42 so as to project to the side opposite to the surface to which the tone wheel 44 is bonded.

Therefore, the flange portion 42 provided with the short cylindrical portion 45 has an increased rigidity in the axial direction, so that the cylindrical portion 41 of the cored bar 43 is externally fitted and fixed to the inner end portion of the inner ring 5. When the flange portion 42 is pressed in the axial direction by the press-fitting jig 15, the axial deformation is suppressed. Therefore, the cored bar 43 of the second embodiment can obtain the same effects as the cored bar 33 of the first embodiment.

FIG. 5 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to a third embodiment of the present invention, showing a tone wheel 54 in a magnetic encoder 50.
Is attached. This magnetic encoder 50 is
A core portion 53 having a cylindrical portion 51 fitted onto the inner end portion of the inner ring 5 and a flange portion 52 extending radially outward from the end portion of the cylindrical portion 51 facing the vehicle width direction center side, and the flange portion 52. An annular tone wheel 54, which is adhered to one surface of the vehicle facing the center side in the vehicle width direction and has S poles and N poles alternately arranged along the circumferential direction, and a magnetic sensor (not shown).

An annular overlapping portion 55 forming a reinforcing rib as a deformation preventing means is provided at a substantially central portion of the flange portion 52 of the core metal 53 in the radial direction by, for example, press molding. The annular overlapping portion 55 is formed by bending the flange 52 in a substantially central portion in the radial direction so as to project to the side opposite to the surface to which the tone wheel 54 is adhered.

Therefore, the flange portion 52 provided with the annular overlapping portion 55 has an increased rigidity in the axial direction, so that the cylindrical portion 51 of the cored bar 53 can be externally fitted and fixed to the inner end portion of the inner ring 5. When the portion 52 is pressed in the axial direction by the press-fitting jig 15, the axial deformation is suppressed. Therefore, the core metal 53 of the third embodiment can obtain the same operational effect as the core metal 33 of the first embodiment.

FIG. 6 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to a fourth embodiment of the present invention. The tone wheel 64 in the magnetic encoder 60 is shown in FIG.
Is attached. This magnetic encoder 60 is
A core portion 63 having a cylindrical portion 61 fitted onto the inner end portion of the inner ring 5 and a flange portion 62 extending radially outward from the end portion of the cylindrical portion 61 facing the vehicle width direction center side, and the flange portion 62. An annular tone wheel 64, which is adhered to one surface of the vehicle facing the center side in the vehicle width direction and has S poles and N poles alternately arranged along the circumferential direction, and a magnetic sensor (not shown).

On the outer peripheral end of the flange portion 62 of the core metal 63, an annular overlapping portion 65 forming a reinforcing rib as a deformation preventing means is provided by, for example, press molding. The annular overlapping portion 65 has a bent portion protruding outward in the vehicle width direction, a bending tip portion extending inward in the vehicle width direction, and the bending tip portion 65a is bonded to the flange portion 62 to the tone wheel 64. It is almost flush with.

Therefore, the flange portion 62 provided with the annular overlapping portion 65 has an increased rigidity in the axial direction, so that the cylindrical portion 61 of the cored bar 63 is externally fitted and fixed to the inner end portion of the inner ring 5. When the portion 62 is pressed in the axial direction by the press-fitting jig 15, deformation in the axial direction is suppressed. Therefore, the cored bar 63 of the fourth embodiment can obtain the same effects as the cored bar 33 of the first embodiment.

FIG. 7 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to a fifth embodiment of the present invention. The tone wheel 74 in the magnetic encoder 70 is shown in FIG.
Is attached. This magnetic encoder 70 is
A core portion 73 having a cylindrical portion 71 fitted onto the inner end portion of the inner ring 5 and a flange portion 72 extending radially outward from the end portion of the cylindrical portion 71 facing outward in the vehicle width direction, and a flange portion. An annular tone wheel 74, which is adhered to one surface of the vehicle 72 facing the center side in the vehicle width direction and has S poles and N poles alternately arranged along the circumferential direction, and a magnetic sensor (not shown) are provided.

The end portion of the core metal 73 on the center side in the vehicle width direction of the cylindrical portion 71 is a press-fitting jig 15a as a deformation preventing means.
Is a jig contacting portion 75 that abuts on the flange portion 72, and protrudes toward the vehicle width direction center side from the tone wheel 74 adhered to the flange portion 72. Therefore, in order to fit the cylindrical portion 71 of the core metal 73 onto the inner end portion of the inner ring 5, the core metal 7 is fixed.
When pressing 3 in the axial direction by the press-fitting jig 15a, the core metal 73 of the inner ring 5 is attached to the inner ring 5 while the press-fitting jig 15a is in contact with the jig contacting portion 75 formed at the end of the cylindrical portion 71. Since it can be press-fitted and fixed to the inner end, the flange 72
The pressure input does not act directly on the, and deformation can be prevented. Therefore, the core metal 73 of the fifth embodiment can obtain the same operational effect as the core metal 33 of the first embodiment.

FIG. 8 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to a sixth embodiment of the present invention. The tone wheel 84 in the magnetic encoder 80 is shown in FIG.
Is attached. This magnetic encoder 80 is
A metal core 83 having a cylindrical portion 81 fitted on the inner end of the inner ring 5 and a flange portion 82 extending radially outward from the end portion of the cylindrical portion 81 facing the center side in the vehicle width direction, and the flange portion 82. An annular tone wheel 84, which is attached to one surface of the vehicle facing the center side in the vehicle width direction and has S poles and N poles alternately arranged along the circumferential direction, and a magnetic sensor (not shown).

The end portion of the core metal 83 on the center side in the vehicle width direction of the cylindrical portion 81 is a press-fitting jig 15a as a deformation preventing means.
Is a jig contact portion 85 with which the contact is made. The jig contact portion 85 has an annular overlapping portion that is folded back by bending or the like and extends inward in the vehicle width direction, and a bent tip end thereof is substantially flush with the tone wheel 84 bonded to the flange portion 82. Has become.

Therefore, in order to fit the cylindrical portion 81 of the cored bar 83 onto the inner end of the inner ring 5, the cored bar 83 is press-fitted in the jig 1.
When pressing in the axial direction by 5a, the core metal 83 is attached to the inner end of the inner ring 5 in a state where the press fitting jig 15a is in contact with the jig contact portion 85 formed at the end of the cylindrical portion 81. Since it can be press-fitted and fixed to the flange portion 82, the flange portion 82 is prevented from being deformed because the pressure input does not directly act on the flange portion 82. Therefore, the core metal 83 of the sixth embodiment can obtain the same operational effect as the core metal 33 of the first embodiment.

The rolling bearing unit 39 with a tone wheel according to the seventh embodiment of the present invention, as shown in FIG.
Two rows of inner rings 5 and 5 that are fitted onto the cylindrical portion 3 of the hub 2, an outer ring 7 that is fitted onto the two rows of inner rings 5 and 5 via balls 6, and a plurality of balls 6 are approximately circumferentially arranged. And a retainer 8 which holds the rolls at equal intervals so that they can roll. Further, the tone wheel 34 of the magnetic encoder 90 is attached to the inner end portion of the inner ring 5 which is the rotation side race member.

As shown in FIG. 10, the magnetic encoder 90 has a cylindrical portion 91 fitted on the inner end portion of the inner ring 5 and a radially outward portion from the inner end portion of the cylindrical portion 91. A core metal 93 having an extending flange portion 92, and an annular tone wheel 34 which is adhered to one surface of the flange portion 92 facing the center side in the vehicle width direction and in which S poles and N poles are alternately arranged along the circumferential direction. , And a magnetic sensor 16 disposed in the mounting housing 4.

The core metal 93 is used as a slinger with which the three lip portions 18 of the seal ring 17 fitted in the outer ring 7 are slidably contacted for the purpose of waterproofing the bearing and sealing grease. It has substantially the same shape as the core metal 33 of the magnetic encoder 30 of the first embodiment shown in FIG. However, in order to secure the contact surface of the lip portion 18 with the flange portion 92, the length of the reinforcing rib 95 is slightly shorter than that of the reinforcing rib 35 of the first embodiment. Therefore, the core bar 93 of the seventh embodiment is the core bar 33 of the first embodiment.
It is possible to obtain the same operational effect as.

FIG. 11 is an enlarged cross-sectional view of the essential parts of the rolling bearing unit with a tone wheel according to the eighth embodiment of the present invention, in which the tone wheel 44 of the magnetic encoder 100 is attached. This magnetic encoder 10
The core metal 103 to which the tone wheel 44 of No. 0 is bonded is the three lip portions 1 of the seal ring 17 fitted in the outer ring 7.
8 is used as a slinger in sliding contact.

The core metal 103 has a cylindrical portion 101 fitted on the inner end of the inner ring 5, and a flange extending radially outward from the end of the cylindrical portion 101 facing the center in the vehicle width direction. And a cored bar 43 in the magnetic encoder 40 of the second embodiment shown in FIG. 4, which has a portion 102 and a short cylindrical portion 105 which is a deformation preventing means provided on the outer peripheral end of the flange portion 102. It has a substantially similar shape. Therefore,
The core metal 103 of the eighth embodiment can obtain the same operational effect as the core metal 43 of the second embodiment.

FIG. 12 is an enlarged sectional view of a main part of a rolling bearing unit with a tone wheel according to a ninth embodiment of the present invention, in which the tone wheel 64 of the magnetic encoder 110 is attached. This magnetic encoder 11
The core metal 113 to which the tone wheel 64 of No. 0 is bonded is the three lip portions 1 of the seal ring 17 fitted in the outer ring 7.
8 is used as a slinger in sliding contact.

The core bar 113 has a cylindrical portion 111 fitted on the inner end of the inner ring 5, and a flange extending radially outward from the end of the cylindrical portion 111 facing the center in the vehicle width direction. It has a portion 112 and an annular overlapping portion 115 which is a deformation preventing means provided on the outer peripheral end of the flange portion 112, and is substantially the same as the core metal 63 in the magnetic encoder 60 of the fourth embodiment shown in FIG. It has a similar shape. Therefore,
The core metal 113 of the ninth embodiment can obtain the same operational effect as the core metal 63 of the fourth embodiment.

FIG. 13 is an enlarged cross-sectional view of the main part of the rolling bearing unit with a tone wheel according to the tenth embodiment of the present invention, in which the tone wheel 84 of the magnetic encoder 120 is attached. This magnetic encoder 1
The core metal 123 to which the 20 tone wheels 84 are bonded is
The three lip portions 18 of the seal ring 17 fitted in the outer ring 7 are used as slingers that are in sliding contact with each other.

The core metal 123 has a cylindrical portion 121 fitted on the inner end of the inner ring 5, and a flange extending radially outward from the end of the cylindrical portion 121 facing the center in the vehicle width direction. Jig abutting portion 1 that is bent at the end of the portion 122 and the cylindrical portion 121 on the center side in the vehicle width direction and a press-fitting jig abuts
25, and has substantially the same shape as the core metal 83 in the magnetic encoder 80 of the sixth embodiment shown in FIG. Therefore, the core bar 123 of the tenth embodiment can obtain the same operational effect as the core bar 83 of the sixth embodiment.

In each of the above embodiments, the inner ring 5 is used as the rotating side race member and the outer ring 7 is used as the stationary side race member. However, instead of this, the cylindrical portion 3 of the hub 2 is used.
An inner ring raceway groove may be formed on the outer peripheral surface of the cylindrical portion 3 to serve as a rotating side raceway member, and an outer ring raceway groove may be formed on the inner peripheral surface of the mounting housing 4 to make the mounting housing 4 a stationary side raceway member. Further, the outer ring may be the rotating side race member and the inner ring may be the stationary side race member.

[0045]

As is apparent from the above description, according to the rolling bearing unit with a tone wheel of the present invention, the flange portion of the core bar on which the tone wheel is mounted is increased in rigidity and deformed in the axial direction. When the cylindrical portion of the cored bar is press-fitted and fixed to the rotation-side race member, the flange portion is unlikely to be deformed in the axial direction by a pressure input.

Therefore, it becomes easier to obtain an accurate axial position with respect to the bearing component at the detection diameter of the tone wheel press-fitted and fixed to the rotary side race member, and it is possible to reduce axial position variation with respect to the bearing component of the tone wheel. Therefore,
A rolling bearing unit with a tone wheel capable of suppressing the axial deformation of the flange portion of the cored bar and reducing the dimensional accuracy and assembly accuracy of the magnetic sensor and parts supporting and fixing the magnetic sensor. Can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a rolling bearing unit with a tone wheel according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the magnetic encoder shown in FIG.

3A is a view of the cored bar shown in FIG. 2 as seen from the direction of arrow B, and FIG. 3B is a sectional view taken along the line bb in FIG.

FIG. 4 is an enlarged sectional view of an essential part of a rolling bearing unit with a tone wheel according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of an essential part of a rolling bearing unit with a tone wheel according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view of an essential part of a rolling bearing unit with a tone wheel according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to a fifth embodiment of the present invention.

FIG. 8 is an enlarged sectional view of an essential part of a rolling bearing unit with a tone wheel according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view of essential parts of a rolling bearing unit with a tone wheel according to a seventh embodiment of the present invention.

FIG. 10 is an enlarged view of a main part of the magnetic encoder shown in FIG.

FIG. 11 is an enlarged cross-sectional view of a main part of a rolling bearing unit with a tone wheel according to an eighth embodiment of the present invention.

FIG. 12 is an enlarged sectional view of an essential part of a rolling bearing unit with a tone wheel according to a ninth embodiment of the present invention.

FIG. 13 is an enlarged sectional view of an essential part of a rolling bearing unit with a tone wheel according to a tenth embodiment of the present invention.

FIG. 14 is a vertical cross-sectional view of a wheel bearing unit for explaining a conventional rolling bearing unit with a tone wheel.

15 is an enlarged sectional view of an essential part for explaining a problem of the rolling bearing unit with a tone wheel shown in FIG.

FIG. 16 is an enlarged cross-sectional view of an essential part for explaining a rolling bearing unit with a tone wheel using a conventional slinger.

[Explanation of symbols]

5 Inner ring (Rotating side track member) 6 balls (rolling elements) 7 Outer ring (stationary side track member) 16 Magnetic sensor 30 magnetic encoder 31 Cylindrical part 32 Flange 33 core 34 tone wheel 35 Reinforcing rib (deformation prevention means)

Claims (3)

[Claims] 1. A stationary side raceway member, a rotating side raceway member which is arranged to face the stationary side raceway member through a plurality of rolling elements, a cylindrical portion which is press-fitted into the rotating side raceway member, and the cylinder. A core bar having a flange portion extending in the radial direction from the end of the portion, and an annular tone wheel mounted on one surface of the flange portion in a state where the magnetizing direction is alternately changed along the circumferential direction. In the rolling bearing unit with a tone wheel, the deformation preventing means for preventing the flange portion from being deformed in the axial direction when the cylindrical portion of the core metal is press-fitted into the rotation side race member is provided on the core metal. A rolling bearing unit with a tone wheel, which is characterized by being provided. 2. The rolling bearing unit with a tone wheel according to claim 1, wherein the deformation preventing means comprises a reinforcing rib formed on the flange portion to enhance bending rigidity. 3. The rolling bearing with a tone wheel according to claim 1, wherein the deformation preventing means comprises a jig contact portion which is formed at an end portion of the cylindrical portion and which a press-fit jig contacts. unit.