JPH08240605A - Rolling bearing for detecting rotating speed - Google Patents

Abstract

PURPOSE: To make it possible to detect the speed surely even if a rotating speed is slow by detecting the rotation of a tone wheel, which is fixed to a rotary shaft of either an inner wheel or an outer wheel, by a photo-sensor, which is provided at the fixed wheel of the other wheel. CONSTITUTION: A ring-shaped tone wheel 16 having the L-shaped cross section is provided at the outer surface of an inner wheel 11 at a position deviated from an inner-wheel track 12. A plurality of through holes 18 are provided at an outward flange-shaped fitting part 17 in the circumferential direction. At the inner surface part of an inner wheel 13, a photo-sensor 19, which has the fork-end shape and has a light receiving part and a light projecting part, is fixed. The parts of the through holes 18 are held. Sealing members 20-22 are provided at the specified parts of the inner surface of the outer wheel 13. The sensor 19 intermittently receives the light during the rotation of the inner wheel 11. The rotating speed is obtained by the change in time interval. The magnitude of the signal outputted from the sensor 19 is constant regardless of the rotating speed. Therefore, the the detection is securely perform even when the speed is slow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A rolling bearing for detecting a rotation speed according to the present invention is incorporated in, for example, an anti-skid brake system for an automobile (hereinafter, simply referred to as "ABS"), and a rotation speed of a wheel during braking. To prevent the wheels from locking during braking (the wheels do not rotate even though the automobile is in a running state).

[0002]

2. Description of the Related Art In various mechanical devices, the rotational speed of a shaft is detected. For example, in an ABS, a wheel during braking is conventionally constructed by a structure as shown in FIG. The rotation speed of is being detected. The hub 1 has a flange 2 for fixing the wheel fixedly mounted on the outer peripheral surface thereof,
It is freely rotatable by a drive shaft (not shown). An inner ring raceway 3 is formed on the outer peripheral surface of the intermediate portion of the hub 1, and an inner raceway 4 is also formed on the outer peripheral surface of the end outer peripheral surface.
The inner ring 5, which is formed by, is externally fitted and fixed. 6 is an outer ring supported by a suspension device, 7 and 7 are between inner ring raceways 3 and 4 formed on the outer peripheral surfaces of the hub 1 and the inner ring 5, and outer ring raceways 8 and 8 formed on the inner peripheral surface of the outer ring 6. Is a plurality of rolling elements mounted on.

In the case of the rotary support part constructed as described above,
With the rolling of the rolling elements 7, 7, the wheel fixed to the flange 2 on the outer peripheral surface of the hub 1 becomes rotatable with respect to the outer ring 6 supported by the suspension device.

[0004] ABS is a danger (increased braking distance, direction) associated with the fact that the wheels thus rotatably supported with respect to the suspension system lock early (before the automobile stops) during braking. It is intended to prevent the inability to change). In order to achieve such an object, it is necessary to detect the rotational speed of the wheel during braking and adjust the hydraulic pressure of the brake device in accordance with this rotational speed.

Therefore, conventionally, as shown in FIG. 3, the inner ring 5
A gear-shaped tone wheel 9 is provided at one end of the outer ring 6 from the inner ring raceway 4 and an electromagnetic induction type sensor 10 is provided at the end of the outer ring 6 facing the outer peripheral edge of the tone wheel 9. The rotational speed of the hub 1 to which the tone wheel 9 is fixed can be freely detected.

[0006]

In the case of the conventional rolling bearing for detecting the rotational speed as described above, the pulse detection is performed in the electromagnetic induction type by the combination of the gear-shaped tone wheel 9 and the electromagnetic induction type sensor 10. I was like. Sensor 1
The strength of the signal sent from 0 increases almost in proportion to the rotation speed of the tone wheel 9. For this reason, when the traveling speed of the vehicle is slow and the rotation speed of the tone wheel 9 is slow, the strength of the signal sent from the sensor 10 becomes weak, and the detection of the wheel rotation speed tends to be uncertain.
Further, it is troublesome to form the gear-shaped tone wheel 9,
This has also been a cause of increasing the manufacturing cost of the rolling bearing for detecting the rotation speed.

In the rolling bearing for detecting the rotation speed of the present invention, a tone wheel having through holes for transmitting light formed at equal intervals in the circumferential direction is used, and a photo sensor is used as a sensor. By doing so, the above-mentioned inconvenience is eliminated.

[0008]

A rolling bearing for detecting a rotational speed according to the present invention includes an inner ring having an inner ring raceway formed on an outer peripheral surface, an outer ring having an outer ring raceway formed on an inner peripheral surface, and an inner ring and an outer ring. It is made of a plurality of rolling elements provided and a light-shielding plate material, and is fixed to a rotating wheel that is one of an inner ring and an outer ring that rotates at the time of use, and has a through hole that transmits light. The tone wheel is arranged intermittently and at equal intervals in the circumferential direction, and the tone wheel is provided with a light projecting portion and a light receiving portion sandwiching a portion of the tone wheel in which the through hole is formed. A photo sensor, which is the other member of the outer ring and is fixed to a fixed ring that does not rotate during use, and one side in the axial direction of the rolling support portion on which the plurality of rolling elements are installed, the rolling support portion and the above Installed in the area between the tone wheel and one side in the axial direction. A first seal member that closes the cross-section of the cylindrical space between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring at this portion, and the cylindrical member provided on the other side in the axial direction of the rolling support portion. A second seal member that closes the cross section of the space near one end in the axial direction, and an axially other side of the tone wheel that blocks the portion where the tone wheel and the photosensor are installed together with the first seal member from the outside. And a third seal member.

[0009]

When detecting the rotational speed of the wheel or the like rotatably supported by the rolling bearing by the rotational speed detecting rolling bearing of the present invention constructed as described above, one of the inner ring and the outer ring is detected. The rotation speed of the rotary wheel is detected by detecting the rotation of the tone wheel fixed to the rotary wheel, which is a member, by a photosensor provided on the fixed ring, which is the other member of the inner ring and the outer ring. You can

In this case, the magnitude of the electric signal sent from the photo sensor is always constant regardless of the rotation speed of the rotating wheel. Therefore, even when the traveling speed of the vehicle is slow and the rotation speed of the rotating wheel is slow, it is possible to reliably detect the rotation speed of the wheel and the like that rotate together with the rotating wheel.

Further, since the tone wheel is fixed to the rotary wheel and the photosensor is fixed to the fixed wheel, the entire rolling bearing for detecting the rotational speed can be integrally handled as a unit. Therefore, parts management and assembly work such as ABS becomes easy.

Further, since the first and second seal members block the rolling support portion on which the rolling elements are installed from both sides in the axial direction, the grease present in the rolling support portion does not leak out. Therefore, the grease does not adhere to the photo sensor or the tone wheel to cause malfunction of the rotation speed detecting device, or the grease existing in the rolling support portion is insufficient to impair the durability of the rolling bearing. Further, since the third seal member shuts off the portion where the tone wheel and the photo sensor are installed from the outside, it is possible to prevent the tone wheel and the photo sensor from being contaminated by foreign matter such as dust floating outside, The rotation speed of the rotating wheel can be detected more stably.

[0013]

1 and 2 show an embodiment of the present invention.
An inner ring raceway 12 formed on the outer peripheral surface of the inner ring 11 and an outer ring 13
A plurality of rolling elements 15, 15 between the outer ring raceway 14 formed on the inner peripheral surface of each of the rolling elements 15, 15 and the inner peripheral side and the outer peripheral side of each rolling element 15, 15 contact the both raceways 12, 14 respectively. It is provided in the opened state. Therefore, the inner ring 11 and the outer ring 13 relatively rotate as the rolling elements 15 roll.

On the outer peripheral surface of the inner ring 11, a tone wheel 16 having an L-shaped cross section and made entirely of an annular shape by a light shielding plate material such as a steel plate is externally fitted and fixed at a position deviated from the inner ring raceway 12. are doing. A plurality of through holes 1 are formed in the flange portion 17 of the tone wheel 16 having an outward flange shape.
8 and 18 are provided intermittently and equidistantly from each other in the circumferential direction.

On the other hand, a photosensor 19 formed in a bifurcated shape is fixed to the inner peripheral surface of the outer ring 13. A light receiving portion and a light emitting portion are provided on the two-pronged portion of the photo sensor 19.
They are provided so as to face each other. The light receiving portion and the light emitting portion in the state where the photo sensor 19 is fixed to the outer ring 13 are a part of the collar portion 17, and the plurality of light transmitting portions 18,
It is located on both sides of the part where 18 is formed.

Further, the first, second and third sealing members 20, 21, 22 are provided at three positions on the inner peripheral surface of the outer ring 13.
In series along the axial direction (left-right direction in FIG. 1),
Moreover, they are arranged with a space between each other. That is, the outer peripheral edge portions of these seal members 20, 21, 22 are supported and fixed to predetermined portions of the inner peripheral surface of the outer ring 13, and the inner peripheral edges of these seal members 20, 21, 22 are fixed to the inner ring 1
It is in sliding contact with a predetermined portion of the outer peripheral surface of 1.

Of these, the first seal member 20 existing in the intermediate portion in the axial direction is one side (the right side in FIG. 1) in the axial direction of the rolling support portion 23 in which the plurality of rolling elements 15, 15 are installed. Rolling support portion 23 and the above tone wheel 1
It is provided in a portion between 6 and one axial side (left side in FIG. 1). Such a first seal member 20 closes the cross section of the intermediate portion of the cylindrical space 24 between the outer peripheral surface of the inner ring 11 and the inner peripheral surface of the outer ring 13, and the grease present in the rolling support portion 23 is It is prevented that the tone wheel 16 and the photo sensor 19 are installed.

The second seal member 21 existing at one end in the axial direction (the left end in FIG. 1) is provided on the other side in the axial direction of the rolling support portion 23 (the left side in FIG. 1), and the cylindrical space 2 is provided.
The cross section of the portion of 4 which is close to one end in the axial direction (close to the left in FIG. 1) is closed. The second seal member 21 is provided in the rolling support portion 2
Prevent the grease existing in 3 from leaking outside.

Further, the third seal member 22 existing at the other end in the axial direction (the right end in FIG. 1) is provided on the other side in the axial direction of the tone wheel 16 (the right side in FIG. 1) and has a cylindrical space 24.
The cross section of the portion closer to the other end in the axial direction (closer to the right in FIG. 1) is closed.
The third seal member 22 blocks the portion where the tone wheel 16 and the photo sensor 19 are installed from the outside, and dust or the like floating outside enters the portion where the tone wheel 16 and the photo sensor 19 are installed. Prevent.

In the illustrated embodiment configured as described above, light is intermittently sent to the light receiving portion of the photo sensor 19 as the inner ring 11 rotates. Since the time interval at which light is sent to the light receiving portion of the photo sensor 19 changes depending on the rotation speed of the inner ring 11, a signal from the photo sensor 19 causes
It is possible to know the rotational speeds of the inner ring 11 and members such as wheels fixed to the inner ring 11.

In this way, when the rotational speed of the inner ring 11 rotating with the wheel or the like is detected by the movement of the through holes 18, 18, the magnitude of the electric signal sent from the photosensor 19 is the rotational speed. It is always constant regardless of. Therefore, even when the traveling speed of the vehicle is slow and the rotation speed of the inner ring 11 is slow, it is possible to reliably detect the rotation speed of the wheel that rotates with the inner ring 11.

Further, the tone wheel 16 having the through holes 18, 18 is externally fitted and fixed to the outer peripheral surface of the inner ring 11, and the photo sensor 19 is fixed to the inner peripheral surface of the outer ring 13.
The entire rolling bearing for rotational speed detection can be handled as a unit. Therefore, parts management and assembly work such as ABS becomes easy.

Furthermore, both the first and second seal members 20, 21
However, since the rolling support portion 23 in which the rolling elements 15 and 15 are installed is closed from both sides in the axial direction, the grease present in the rolling support portion 23 does not leak outside. Therefore, this grease does not adhere to the photo sensor 19 and the tone wheel 16. Further, since the third seal member 22 shuts off the portion where the tone wheel 16 and the photo sensor 19 are installed from the outside, the tone wheel 16 and the photo sensor 19 are contaminated by foreign matters such as dust floating outside. Can also be prevented. That is, the tone wheel 16
It is possible to sufficiently secure the magnitude of the electric signal sent from the photo sensor 19 without clogging the through holes 18 formed in the above. Further, since the light receiving portion and the light emitting portion of the photo sensor 19 are not contaminated, the magnitude of the electric signal can be sufficiently secured from this aspect. Furthermore, the grease present in the rolling support portion 23 will not run short and the durability of the rolling bearing will not be impaired.

[0024]

The rolling bearing for detecting the rotational speed of the present invention comprises:
Since it is configured and operates as described above, it does not require a gear-shaped tone wheel, and is a structure that can be easily manufactured.
Even if the rotation speed of the wheel is low, the rotation speed of the wheel can be detected reliably, and the performance of ABS or the like can be stabilized. Further, since the constituent parts can be handled integrally, the parts management and the assembling work of the device incorporating the rolling bearing for detecting the rotational speed become easy. Further, it is possible to effectively prevent the tone wheel and the photo sensor from being soiled, to reliably detect the rotation speed over a long period of time, and at the same time, to ensure the durability of the rolling support portion.

[Brief description of drawings]

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

FIG. 2 is a diagram of the photo sensor and the tone wheel taken out from the right side of FIG.

FIG. 3 is a partial sectional view showing an example of a conventional rolling bearing for detecting a rotational speed.

[Explanation of symbols]

 1 hub 2 flanges 3 and 4 inner ring raceway 5 inner ring 6 outer ring 7 rolling element 8 outer ring raceway 9 tone wheel 10 sensor 11 inner ring 12 inner ring raceway 13 outer ring 14 outer ring raceway 15 rolling element 16 tone wheel 17 collar portion 18 through hole 19 photo sensor 20 First seal member 21 Second seal member 22 Third seal member 23 Rolling support portion 24 Cylindrical space

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[Procedure amendment]

[Submission date] February 19, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Patent application title: Rolling bearing for detecting rotational speed

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION A rolling bearing for detecting a rotation speed according to the present invention is incorporated in, for example, an anti-skid brake system for an automobile (hereinafter, simply referred to as "ABS"), and a rotation speed of a wheel during braking. To prevent the wheels from locking during braking (the wheels do not rotate even though the automobile is in a running state).

[0002]

2. Description of the Related Art In various mechanical devices, the rotational speed of a shaft is detected. For example, in an ABS, a wheel during braking is conventionally constructed by a structure as shown in FIG. The rotation speed of is being detected. The hub 1 has a flange 2 for fixing the wheel fixedly mounted on the outer peripheral surface thereof,
It is freely rotatable by a drive shaft (not shown). An inner ring raceway 3 is formed on the outer peripheral surface of the intermediate portion of the hub 1, and an inner raceway 4 is also formed on the outer peripheral surface of the end outer peripheral surface.
The inner ring 5, which is formed by, is externally fitted and fixed. 6 is an outer ring supported by a suspension device, 7 and 7 are between inner ring raceways 3 and 4 formed on the outer peripheral surfaces of the hub 1 and the inner ring 5, and outer ring raceways 8 and 8 formed on the inner peripheral surface of the outer ring 6. Is a plurality of rolling elements mounted on.

In the case of the rotary support part constructed as described above,
With the rolling of the rolling elements 7, 7, the wheel fixed to the flange 2 on the outer peripheral surface of the hub 1 becomes rotatable with respect to the outer ring 6 supported by the suspension device.

[0004] ABS is a danger (increased braking distance, direction) associated with the fact that the wheels thus rotatably supported with respect to the suspension system lock early (before the automobile stops) during braking. It is intended to prevent the inability to change). In order to achieve such an object, it is necessary to detect the rotational speed of the wheel during braking and adjust the hydraulic pressure of the brake device in accordance with this rotational speed.

Therefore, conventionally, as shown in FIG. 3, the inner ring 5
A gear-shaped tone wheel 9 is provided at one end of the outer ring 6 from the inner ring raceway 4 and an electromagnetic induction type sensor 10 is provided at the end of the outer ring 6 facing the outer peripheral edge of the tone wheel 9. The rotational speed of the hub 1 to which the tone wheel 9 is fixed can be freely detected.

[0006]

In the case of the conventional rolling bearing for detecting the rotational speed as described above, the pulse detection is performed in the electromagnetic induction type by the combination of the gear-shaped tone wheel 9 and the electromagnetic induction type sensor 10. I was like. Sensor 1
The strength of the signal sent from 0 increases almost in proportion to the rotation speed of the tone wheel 9. For this reason, when the traveling speed of the vehicle is slow and the rotation speed of the tone wheel 9 is slow, the strength of the signal sent from the sensor 10 becomes weak, and the detection of the wheel rotation speed tends to be uncertain.
Further, it is troublesome to form the gear-shaped tone wheel 9,
This has also been a cause of increasing the manufacturing cost of the rolling bearing for detecting the rotation speed.

In the rolling bearing for detecting the rotation speed of the present invention, a tone wheel having through holes for transmitting light formed at equal intervals in the circumferential direction is used, and a photo sensor is used as a sensor. By doing so, any of the inconveniences described above can be eliminated.

[0008]

A rolling bearing for detecting a rotational speed according to the present invention includes an inner ring having an inner ring raceway formed on an outer peripheral surface, an outer ring having an outer ring raceway formed on an inner peripheral surface, and an inner ring and an outer ring. It is made of a plurality of rolling elements provided and a light-shielding plate material, and is fixed to a rotating wheel that is one of an inner ring and an outer ring that rotates at the time of use, and has a through hole that transmits light. The tone wheel is arranged intermittently and at equal intervals in the circumferential direction, and the tone wheel is provided with a light projecting portion and a light receiving portion sandwiching a portion of the tone wheel in which the through hole is formed. A photo sensor, which is the other member of the outer ring and is fixed to a fixed ring that does not rotate during use, and one side in the axial direction of the rolling support portion on which the plurality of rolling elements are installed, the rolling support portion and the above In the part between the axial direction one side of the tone wheel, The outer peripheral edge of the inner ring is locked to the inner peripheral surface of the outer ring, and the inner peripheral edge is provided in sliding contact with the outer peripheral surface of the inner ring. A first seal member that closes the cross section of the cylindrical space between them, and the outer peripheral edge thereof is locked to the inner peripheral surface of the outer ring on the other side in the axial direction of the rolling support portion, and the inner peripheral edge of the outer peripheral surface of the inner ring A second seal member which is provided in a state of sliding contact with the cylindrical space and closes a cross section of a portion of the cylindrical space closer to one end in the axial direction; and an outer peripheral edge of the second seal member on the other side in the axial direction of the tone wheel. A third seal that is locked to a surface and has its inner peripheral edge slidably contacting the outer peripheral surface of the inner ring, and that shields the portion where the tone wheel and the photosensor are installed together with the first seal member from the outside. And a member.

[0009]

When detecting the rotational speed of the wheel or the like rotatably supported by the rolling bearing by the rotational speed detecting rolling bearing of the present invention constructed as described above, one of the inner ring and the outer ring is detected. The rotation of the tone wheel fixed to the rotating wheel that is a member is detected by the photosensor provided on the fixed wheel that is the other member of the inner ring and the outer ring,
The rotation speed of the rotating wheel can be detected.

In this case, the magnitude of the electric signal sent from the photo sensor is always constant regardless of the rotation speed of the rotating wheel. Therefore, even when the traveling speed of the vehicle is slow and the rotation speed of the rotating wheel is slow, it is possible to reliably detect the rotation speed of the wheel and the like that rotate together with the rotating wheel.

Further, since the tone wheel is fixed to the rotary wheel and the photosensor is fixed to the fixed wheel, the entire rolling bearing for detecting the rotational speed can be integrally handled as a unit. Therefore, parts management and assembly work such as ABS becomes easy.

Furthermore, since the first and second seal members close the rolling support portion on which the rolling elements are installed from both sides in the axial direction without a gap, the grease present in the rolling support portion does not leak outside. Therefore, the grease does not adhere to the photo sensor or the tone wheel to cause malfunction of the rotation speed detecting device, or the grease existing in the rolling support portion is insufficient to impair the durability of the rolling bearing.
Further, the third seal member shuts off the portion where the tone wheel and the photo sensor are installed from the outside without a gap.
Therefore, the tone wheel and the photo sensor can be prevented from being contaminated by foreign matter such as dust floating outside, and the rotational speed of the rotating wheel can be detected more stably.

[0013]

1 and 2 show an embodiment of the present invention.
Inner ring raceway 12 formed on the outer peripheral surface of the inner ring 11 that is a rotating wheel
And the outer ring raceway 14 formed on the inner peripheral surface of the outer ring 13 which is a fixed ring, a plurality of rolling elements 15, 15 are provided on the inner peripheral side and the outer peripheral side of the rolling elements 15, 15, respectively. Both orbits 1
It is provided in a state of being in contact with Nos. 2 and 14. Therefore, as the rolling elements 15, 15 roll, the inner ring 11 and the outer ring 13
And rotate relative to each other.

On the outer peripheral surface of the inner ring 11, a tone wheel 16 having an L-shaped cross section and made entirely of an annular shape by a plate material having a light shielding property such as a steel plate is externally fitted and fixed at a position deviated from the inner ring raceway 12. are doing. A plurality of through holes 1 are formed in the flange portion 17 of the tone wheel 16 having an outward flange shape.
8 and 18 are provided intermittently and equidistantly from each other in the circumferential direction.

On the other hand, a photosensor 19 formed in a bifurcated shape is fixed to the inner peripheral surface of the outer ring 13. A light receiving portion and a light emitting portion are provided on the two-pronged portion of the photo sensor 19.
They are provided so as to face each other. The light receiving portion and the light emitting portion in the state where the photo sensor 19 is fixed to the outer ring 13 are a part of the collar portion 17, and the plurality of light transmitting portions 18,
It is located on both sides of the part where 18 is formed.

Further, the first, second and third sealing members 20, 21, 22 are provided at three positions on the inner peripheral surface of the outer ring 13.
In series along the axial direction (left-right direction in FIG. 1),
Moreover, they are arranged with a space between each other. That is, the outer peripheral edge portions of these seal members 20, 21, 22 are supported and fixed to predetermined portions of the inner peripheral surface of the outer ring 13, and the inner peripheral edges of these seal members 20, 21, 22 are fixed to the inner ring 1
It is in sliding contact with a predetermined portion of the outer peripheral surface of 1.

Of these, the first seal member 20 existing in the intermediate portion in the axial direction is one side (the right side in FIG. 1) in the axial direction of the rolling support portion 23 in which the plurality of rolling elements 15, 15 are installed. Rolling support portion 23 and the above tone wheel 1
It is provided in a portion between 6 and one axial side (left side in FIG. 1). Such a first seal member 20 closes the cross section of the intermediate portion of the cylindrical space 24 between the outer peripheral surface of the inner ring 11 and the inner peripheral surface of the outer ring 13 without any gap, and the grease present in the rolling support portion 23 is present. However, it prevents the tone wheel 16 and the photo sensor 19 from entering the installation portion.

The second seal member 21 existing at one end in the axial direction (the left end in FIG. 1) is provided on the other side in the axial direction of the rolling support portion 23 (the left side in FIG. 1), and the cylindrical space 2 is provided.
The cross section of the portion of the No. 4 near the one end in the axial direction (to the left in FIG. 1) is closed without any gap. The second seal member 21 prevents the grease existing in the rolling support portion 23 from leaking to the outside.

Further, the third seal member 22 existing at the other end in the axial direction (the right end in FIG. 1) is provided on the other side in the axial direction of the tone wheel 16 (the right side in FIG. 1) and has a cylindrical space 24.
The cross section of the portion closer to the other end in the axial direction (closer to the right in FIG. 1) is closed without a gap. The third seal member 22 shields the portion where the tone wheel 16 and the photo sensor 19 are installed from the outside, and dust and the like floating outside the tone wheel 1
6 and the portion where the photo sensor 19 is installed are prevented from entering.

In the illustrated embodiment configured as described above, light is intermittently sent to the light receiving portion of the photo sensor 19 as the inner ring 11 rotates. Since the time interval at which light is sent to the light receiving portion of the photo sensor 19 changes depending on the rotation speed of the inner ring 11, a signal from the photo sensor 19 causes
It is possible to know the rotational speeds of the inner ring 11 and members such as wheels fixed to the inner ring 11.

In this way, when the rotational speed of the inner ring 11 rotating with the wheel or the like is detected by the movement of the through holes 18, 18, the magnitude of the electric signal sent from the photosensor 19 is the rotational speed. It is always constant regardless of. Therefore, even when the traveling speed of the vehicle is slow and the rotation speed of the inner ring 11 is slow, it is possible to reliably detect the rotation speed of the wheel that rotates with the inner ring 11.

Further, the tone wheel 16 having the through holes 18, 18 is externally fitted and fixed to the outer peripheral surface of the inner ring 11, and the photo sensor 19 is fixed to the inner peripheral surface of the outer ring 13.
The entire rolling bearing for rotational speed detection can be handled as a unit. Therefore, parts management and assembly work such as ABS becomes easy.

Furthermore, both the first and second seal members 20, 21
However, since the rolling support portion 23 provided with the rolling elements 15, 15 is closed from both sides in the axial direction without a gap, the rolling support portion 2
The grease in 3 does not leak out. Therefore, this grease does not adhere to the photo sensor 19 and the tone wheel 16. In addition, the third seal member 22,
Since the portion where the tone wheel 16 and the photo sensor 19 are installed is shielded from the outside without a gap, it is possible to prevent the tone wheel 16 and the photo sensor 19 from being contaminated by foreign matter such as dust floating outside. That is, the through holes 18, 18 formed in the tone wheel 16 are not clogged, and the magnitude of the electric signal sent from the photo sensor 19 can be sufficiently secured. Further, since the light receiving portion and the light emitting portion of the photo sensor 19 are not contaminated, the magnitude of the electric signal can be sufficiently secured from this aspect. Furthermore,
The grease present in the rolling support portion 23 will not run short and the durability of the rolling bearing will not be impaired.

[0024]

The rolling bearing for detecting the rotational speed of the present invention comprises:
Since it is configured and operates as described above, it does not require a gear-shaped tone wheel, and is a structure that can be easily manufactured.
Even if the rotation speed of the wheel is low, the rotation speed of the wheel can be detected reliably, and the performance of ABS or the like can be stabilized. Further, since the constituent parts can be handled integrally, the parts management and the assembling work of the device incorporating the rolling bearing for detecting the rotational speed become easy. Further, it is possible to effectively prevent the tone wheel and the photo sensor from being soiled, to reliably detect the rotation speed over a long period of time, and at the same time, to ensure the durability of the rolling support portion.

[Brief description of drawings]

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

FIG. 2 is a diagram of the photo sensor and the tone wheel taken out from the right side of FIG.

FIG. 3 is a partial sectional view showing an example of a conventional rolling bearing for detecting a rotational speed.

[Explanation of symbols] 1 hub 2 flange 3, 4 inner ring raceway 5 inner ring 6 outer ring 7 rolling element 8 outer ring raceway 9 tone wheel 10 sensor 11 inner ring 12 inner ring raceway 13 outer ring 14 outer ring raceway 15 rolling element 16 tone wheel 17 collar section 18 transparent Hole 19 Photosensor 20 First seal member 21 Second seal member 22 Third seal member 23 Rolling support portion 24 Cylindrical space

Claims (1)

[Claims] 1. An inner ring having an inner ring raceway formed on an outer peripheral surface, an outer ring having an outer ring raceway formed on an inner peripheral surface, a plurality of rolling elements provided between the inner ring and the outer ring, and a light-shielding plate material. One member of the inner ring and the outer ring, which is constructed and fixed to the rotating ring that rotates during use, has light-transmitting through holes arranged intermittently and equidistantly in the circumferential direction. A tone wheel and a light projecting portion and a light receiving portion which are arranged so as to sandwich the portion where the through hole is formed in a part of the tone wheel, and which is the other member of the inner ring and the outer ring and does not rotate during use. The photo sensor fixedly mounted on the fixed wheel and the rolling support portion on which the plurality of rolling elements are installed are provided on one side in the axial direction between the rolling support portion and the one side in the axial direction of the tone wheel. Outer surface of inner ring and inner surface of outer ring A first sealing member that closes the cross section of the cylindrical space between the first and second sealing members, and a second seal member that is provided on the other side in the axial direction of the rolling support portion and that closes the cross section of the axially one end portion of the cylindrical space. A rolling bearing for rotational speed detection, which is provided on the other side of the tone wheel in the axial direction and includes a third seal member that shields the portion where the tone wheel and the photo sensor are installed from the outside together with the first seal member.