JPH10185937A - Bearing for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive sensor rotor having high strength which can be manufactured easily. SOLUTION: A sensor rotor 30 comprises an annular magnetic plate arranged, at a constant interval in the circumferential direction, with a plurality of rectangular punching holes having a constant circumferential width and fixed to a rotary section rotating as a vehicle travels. When a sensor 40 is arranged closely to the sensor rotor, it can be used for detecting the r.p.m. of the rotary section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor rotor, and more particularly to a sensor rotor which is mounted on a rotating part which rotates as a vehicle travels and which is used to detect the number of rotations of the rotating part.

[0002]

2. Description of the Related Art In a vehicle, it is sometimes necessary to detect the number of rotations of wheels. For example, an anti-skid brake system for wheels. This is a device for detecting the number of rotations of the wheels and releasing the brake momentarily when the wheels are about to lock, thereby preventing the lock of the vehicle.
For detection of the rotation speed, a sensor rotor fixed to a rotating portion (for example, a foreign bearing) and an electromagnetic pickup type sensor are preferably used.

Conventionally, as a sensor rotor, an annular member made of a magnetic material family having an uneven gear portion formed on an outer peripheral surface is employed, and this annular member is fitted to a foreign bearing. ing. In this case, in order to form the gear portion, an annular material is broached or machined using a gear cutting machine. However, these methods increase the processing cost or sinter molding. However, there is a problem in that the strength of the sensor rotor is insufficient and the rust prevention treatment is difficult.

An object of the present invention is to solve the above-mentioned problems in the conventional example, that is, to provide a sensor rotor which is easy and inexpensive to manufacture and has sufficient strength.

[0005]

In order to solve the above-mentioned problems, in the present invention, a plate-shaped magnetic material having an annular shape and having a constant circumferential width is used. A sensor rotor having a plurality of rectangular punched holes arranged at equal intervals in the circumferential direction is fitted to a rotating part (for example, an outer ring of a bearing) which rotates as the vehicle travels, and a sensor is attached to the sensor rotor. By approaching, the rotation speed of the rotating unit is detected.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is used in an anti-skid brake system of a vehicle.

As shown in FIG. 1, a pair of internal feeders 10 arranged in the axial direction and two rows of balls 14 held by a retainer 12 are arranged outside the inner race 10 and concentrically therewith. A so-called angular contact type bearing is constituted by the integrated outer ring 20. Outer edge of inner ring 10 and outer ring 20
A seal 18 is interposed between the outer edge of the seal 18 and the outer edge.

The outer race 20 has a main body 22 and a flange portion 24 extending radially outward therefrom, and is fixed to a brake and wheels (not shown) by bolts 26 passing therethrough. A cylindrical sensor rotor 30 is attached to the outer peripheral surface of the outer ring 20. The sensor rotor is made of a plate-shaped magnetic material, has a constant width as a whole as shown in FIGS. 2 and 3, and has a large number of rectangular punch holes 32 which are elongated in the axial direction and are circumferentially spaced. The circumferential width of each punched hole 32 is constant throughout the axial direction. As a result, the circumferential width of the column portion 36 is also constant throughout the axial direction. The sensor rotor 30 is press-fitted into the main body 22 of the outer race 20, so that the outer peripheral surface of the main body 22
Are formed on the outer peripheral surface of the outer ring main body 22 alternately.

The sensor rotor 30 may be formed by punching a large number of holes in a band-shaped material in advance, and then bending the material in an annular shape to join the ends together, or forming a hole in a cylindrical material. It may be stamped. Note that the bearing assembly is
It is set by fitting 0 to a fixed shaft (not shown). When detecting the number of rotations of the wheel, a pickup type sensor 40 is arranged close to the sensor rotor 30 as shown by a two-dot chain line in FIG.

In use, when the wheels rotate, the outer ring 20
In addition, the sensor rotor 30 attached thereto rotates integrally, and the concave portion or hole 32 of the sensor rotor 30 and the column portion 36 other than the convex portion or hole alternately pass in front of the sensor 40. Therefore, the magnetic flux is periodically changed by the sensor rotor 30, and the rotation speed of the wheel is detected by checking the state of this change.

In this embodiment, the punched holes 3 forming the recesses are formed.
2 are formed in the correct rectangle, in particular the circumferential width and the circumferential width of the column portion 36 are constant throughout the axial direction. In addition, the shape and size of the hole 32 are constant in the thickness direction of the sensor rotor, and the thickness of the column portion 36 forming the projection is also constant. Therefore, the passage of the line of magnetic force is correctly changed by the concave or convex portion, and the detection of the rotation speed of the wheel becomes accurate. Further, since the sensor rotor 30 is made of a thin cylindrical member having a small thickness, it can be easily manufactured at low cost. Further, since the weight of the sensor rotor 30 is small, it does not adversely affect the rotation of the outer ring 20 due to the attachment thereof, and the amount of protrusion outward in the radial direction is small, so that it interferes with peripheral devices. Don't worry.

FIGS. 4 to 6 show another embodiment of the present invention. This embodiment is different from the above embodiment in the cross-sectional shape of a member forming the sensor rotor. That is, as shown in FIGS. 5 and 6, the annular sensor rotor 50 has a cylindrical portion 52 and a flange portion 54 extending inward in the radial direction, and has an L-shaped cross section. An elongated rectangular hole 56 is circumferentially spaced (only a part is shown). The sensor rotor 50 is fitted to the outer peripheral surface of the outer ring main body 22 at the cylindrical portion 52, and the flange portion 54
Abuts against the end surface of the outer race body to form the bottom surface of the hole 56. In addition, as shown by a two-dot chain line in FIG.
It will be arranged in the axial direction close to the flange portion.

The sensor rotor 50 is formed by forming a container-shaped material by drawing and then punching a hole 56 in the flange portion 54.
Basically, the same effects as in the above embodiment can be obtained. Also,
Flexibility occurs in the arrangement of the sensor 40.

FIG. 7 shows still another embodiment.
The feature is that the sensor rotor 60 is attached to the outer ring main body 22 via the cylindrical member 70. That is, a cylindrical member 70 made of metal, synthetic resin, or the like is mounted on the outer ring main body 22 and a cylindrical sensor rotor 60 having a hole 62 on the outside.
Is attached. In this way, even if the type of the outer ring 20 changes, the same sensor rotor 60 can cope with it only by changing the type of the cylindrical member 70. This leads to cost reduction of the bearing assembly.

In this way, the same sensor rotor 60 can cope with a change in the type of the bearing and a change in the dimensions of the foreign export, only by changing the type of the sleeve member 70. This leads to a reduction in the cost of the entire bearing device.

The present invention can, of course, be appropriately modified and improved within a range that does not impair the gist of the present invention.

As described above, according to the present invention,
It has unique effects compared to conventional products, such as being easy and inexpensive to manufacture and having sufficient strength.

[Brief description of the drawings]

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

FIG. 2 is a front view showing the sensor rotor according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a front view showing a sensor rotor according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a front sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 inner ring 14 ball 20 outer ring 30, 60 sensor rotor 32 hole 40 sensor 70 sleeve member

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[Procedure amendment]

[Submission date] November 12, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Vehicle bearing device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational speed detecting vehicle bearing device. In particular, the present invention relates to a vehicle bearing device that is attached to an outer ring of an outer ring rotating type bearing that rotates together with wheels as the vehicle travels and is used to detect the number of revolutions of the outer ring. The present invention also relates to a vehicle rotation detecting device for detecting a rotation speed of a vehicle rotating body.

[0002]

2. Description of the Related Art In a vehicle, it is sometimes necessary to detect the number of rotations of wheels. For example, an anti-skid brake system for wheels. This is a device for detecting the rotation speed of the wheel and releasing the brake momentarily when the wheel is about to be locked, thereby preventing the wheel from being locked.
For detecting the rotation speed, a sensor rotor fixed to a rotating portion (for example, an outer ring of a bearing) and an electromagnetic pickup type sensor are preferably used.

[0003]

Conventionally, an annular member made of a magnetic material having an uneven gear portion formed on the outer peripheral surface is employed as a sensor rotor, and this annular member is fitted to an outer ring of a bearing. Has been done. In this case, in order to form the gear portion, an annular material is broached,
Although machining is performed using a gear cutting machine, these methods have problems such as high processing cost, and in the case of sinter molding, the sensor rotor has insufficient strength and it is difficult to perform rust prevention treatment. there were.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems in the above conventional example, that is, to provide a bearing device for a rotation speed detecting vehicle using a sensor rotor which is easy and inexpensive to manufacture and has sufficient strength. I do.

[0005]

In order to solve the above-mentioned problems, the present invention has a rolling element and a bearing inner ring and a bearing outer ring which rotate relative to each other via the rolling element, and the outer ring is used for running a vehicle. The sensor rotor is attached to the outer periphery of the outer ring, and the sensor rotor is a ring of a magnetic body made of a plate material continuous in the circumferential direction, and a through hole is formed in the entire circumference in the circumferential direction. A plurality of the outer races are arranged at equal intervals, and both side portions of the plate material of the through-hole are continuous in the circumferential direction, and by arranging a sensor close to the sensor rotor, the rotation speed of the outer ring is detected. A vehicle bearing device is provided. In such a vehicle bearing device, the sensor rotor has an L-shaped cross section, a cylindrical portion of which is fitted to the outer peripheral surface of the outer ring, and a flange portion extending inward in the radial direction is formed along the end surface of the outer ring to form a flange. Preferably, a plurality of holes are arranged in the part. Further, in the present invention, a vehicle rotating body that rotates together with the wheels as the vehicle travels, and a ring of a magnetic body made of a plate material having an L-shaped cross section that is continuous in the circumferential direction, and the rotating body is formed in a cylindrical portion thereof A flange portion fitted to the outer peripheral surface and extending inward in the radial direction is along the end face of the rotating body, and a plurality of through holes are arranged at equal angular intervals over the entire flange portion, and the A sensor rotor in which both sides in the radial direction of the flange are continuous in the circumferential direction, and a sensor arranged close to the sensor rotor,
There is provided a vehicle rotation detecting device for detecting a rotation speed of the rotating body.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is used in an anti-skid brake system of a vehicle.

As shown in FIG. 1, a pair of inner rings 10 provided in the axial direction and two rows of balls 14 held by a retainer 12 are arranged outside and concentric with the inner ring 10. The integral outer ring 20 constitutes a so-called angular contact type bearing. Outer edge of inner ring 10 and outer ring 20
A seal 18 is interposed between the outer edge of the seal 18 and the outer edge.

The outer race 20 has a main body 22 and a flange portion 24 extending radially outward therefrom, and is fixed to a brake and wheels (not shown) by bolts 26 passing therethrough. A cylindrical sensor rotor 30 is attached to the outer peripheral surface of the outer ring 20. The sensor rotor is made of a plate-shaped magnetic material, has a constant width as a whole as shown in FIGS. 2 and 3, and has a large number of rectangular punch holes 32 which are elongated in the axial direction and are circumferentially spaced. The circumferential width of each punched hole 32 is constant throughout the axial direction. As a result, the circumferential width of the column portion 36 is also constant throughout the axial direction. The sensor rotor 30 is press-fitted into the main body 22 of the outer race 20, so that the outer peripheral surface of the main body 22
Are formed on the outer peripheral surface of the outer ring main body 22 alternately.

The sensor rotor 30 may be formed by punching a large number of holes in a band-shaped material in advance, and then bending the material in an annular shape to join the ends together, or forming a hole in a cylindrical material. It may be stamped. The bearing assembly is inner ring 1
It is set by fitting 0 to a fixed shaft (not shown). When detecting the number of rotations of the wheel, a pickup type sensor 40 is arranged close to the sensor rotor 30 as shown by a two-dot chain line in FIG.

In use, when the wheels rotate, the outer ring 20
In addition, the sensor rotor 30 attached thereto rotates integrally, and the concave portion or hole 32 of the sensor rotor 30 and the column portion 36 other than the convex portion or hole alternately pass in front of the sensor 40. Therefore, the magnetic field lines are periodically changed by the sensor rotor 30, and by checking the state of the change, the rotation speed of the wheel is detected.

In the present embodiment, the punched hole 32 forming the recess is formed in a correct rectangle, and particularly, the circumferential width and the circumferential width of the column portion 36 are constant over the entire axial direction. In addition, the shape and size of the hole 32 are constant in the thickness direction of the sensor rotor, and the thickness of the column portion 36 forming the projection is also constant. Therefore, the passage of the line of magnetic force is correctly changed by the concave or convex portion, and the detection of the rotation speed of the wheel becomes accurate. In addition, the sensor rotor 3
Since the reference numeral 0 is made of a thin cylindrical member having a small thickness, it can be easily manufactured and at low cost. Furthermore, since the weight of the sensor rotor 30 is small, it does not adversely affect the rotation of the outer ring 20 due to the attachment thereof, and since the amount of protrusion outward in the radial direction is small, there is a concern that it will interfere with peripheral devices. Nor.

FIGS. 4 to 6 show another embodiment of the present invention. This embodiment is different from the above-described embodiment in the cross-sectional shape of a member forming the sensor rotor. That is, as shown in FIGS. 5 and 6, the annular sensor rotor 50 has a cylindrical portion 52 and a flange portion 54 extending inward in the radial direction, and has an L-shaped cross section. An elongated rectangular hole 56 is circumferentially spaced (only a part is shown). The sensor rotor 50 is fitted to the outer peripheral surface of the outer ring main body 22 at the cylindrical portion 52, and the flange portion 54 contacts the end surface of the outer ring main body to form the bottom surface of the hole 56. The sensor 40 is arranged in the axial direction close to the flange portion as shown by a two-dot chain line in FIG.

The sensor rotor 50 is formed by forming a container-shaped material by drawing and then punching a hole 56 in the flange portion 54.
Basically, the same effects as in the above embodiment can be obtained. Also, the arrangement of the sensor 40 has flexibility.

FIG. 7 shows still another embodiment, which is characterized in that the sensor rotor 60 is attached to the outer ring main body 22 via a cylindrical member 70. That is, a cylindrical member 70 made of metal, synthetic resin, or the like is mounted on the outer ring main body 22, and a cylindrical sensor rotor 60 having a hole 62 on the outside is mounted. By doing so, the outer ring 2
Even if the type of 0 is changed, the same sensor rotor 60 can cope only by changing the type of the cylindrical member 70. This leads to cost reduction of the bearing assembly.

In this way, even if the type of bearing changes and the dimensions of the outer race change, the same sensor rotor 60 can be used only by changing the type of the sleeve member 70. This leads to a reduction in the cost of the entire bearing device.

The present invention can, of course, be appropriately modified and improved within a range that does not impair the gist of the present invention.

As described above, according to the present invention,
It has unique effects compared to conventional products, such as being easy and inexpensive to manufacture and having sufficient strength.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a sensor rotor according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a front view showing a second embodiment of the present invention.

FIG. 5 is a front view showing a sensor rotor according to a second embodiment of the present invention.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a front sectional view showing a third embodiment of the present invention.

[Description of Signs] 10 Inner ring 14 Ball 20 Outer ring 30, 60 Sensor rotor 32 Hole 40 Sensor 70 Sleeve member 14 Ball 20 Outer ring 30, 60 Sensor rotor 32 Hole 40 Sensor 70 Sleeve member

Claims (1)

Claims: 1. A sensor rotor is mounted on an outer periphery of a vehicle and rotates integrally with wheels as the vehicle travels. The sensor rotor is a magnetic ring made of a plate material, and A vehicle rotating body having a plurality of holes arranged at equal intervals in a circumferential direction, and a rotation number of the vehicle rotating body being detected by arranging a sensor near the sensor rotor. The sensor rotor has an L-shaped cross section, and a cylindrical portion thereof is fitted to an outer peripheral surface of the vehicle rotator, and a flange portion extending inward in the radial direction has an end surface of the vehicle rotator. 2. The vehicle rotating body according to claim 1, wherein the plurality of holes are arranged in the flange portion along the axis. 3. The vehicle rotor according to claim 1, wherein at least a part of the sensor rotor is fitted to the vehicle rotor, and the fitting surface and the hole are separated in the axial direction. . 4. A rolling element, a bearing inner ring and a bearing external bearing which rotate relative to each other via the rolling element, wherein the outer ring rotates integrally with the vehicle as the vehicle travels, and is provided on an outer periphery of the outer ring. A sensor rotor is mounted, the sensor rotor is a ring of a magnetic material made of a plate material, and a plurality of holes are arranged at equal intervals in a circumferential direction, and a sensor is arranged close to the sensor rotor. Thus, a bearing device for a vehicle in which the rotation speed of the outer ring is detected. 5. The sensor rotor has an L-shaped cross section, and a cylindrical portion thereof is fitted to an outer peripheral surface of the outer ring, and a flange portion extending inward in a radial direction is provided along an end surface of the outer ring so as to form the flange. The vehicle bearing device according to claim 4, wherein the plurality of holes are arranged in a portion. 6. The vehicle bearing according to claim 4, wherein at least a part of the sensor rotor is fitted to the foreign export, and the fitting surface and the hole are separated in an axial direction. apparatus.