JP2003049860A - Rolling bearing with rotation status detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a work of incorporating a mechanism for detecting a rotation angle and a rotation direction of a steering shaft 1 and reduce the cost of a steering device with a rotation angle detection function. SOLUTION: A tone wheel 13 is provided on an outer peripheral surface of an inner ring 6.
And the sensor assembly 18 is supported on the outer ring 8. The tone wheel 13 includes a first detection unit that alternately and alternately changes magnetic characteristics in the circumferential direction at equal intervals, and a second detection unit that changes the magnetic characteristics of one portion in the circumferential direction from the magnetic characteristics of the remaining portion. And The sensor assembly 18 includes first and second sensors 21 and 22 each facing the first detection unit, and a third sensor facing the second detection unit. The first sensor 21 and the second sensor 22 are shifted from each other in the circumferential direction.

Description

Description: BACKGROUND OF THE INVENTION A rolling bearing with a rotation angle detecting device according to the present invention is incorporated in, for example, a steering device of an automobile to detect a rotation angle of a steering shaft and the like. Use. 2. Description of the Related Art A steering apparatus of an automobile is provided with a steering shaft supported by a rolling bearing such as a deep groove ball bearing inside a tubular steering column supported on a lower side of a dashboard. It is configured.
When giving a steering angle to the front wheels, the steering shaft is rotated based on the operation of the steering wheel. In a power steering apparatus or a four-wheel steering apparatus, the rotation angle and the rotation angular velocity of the steering shaft are detected, and the hydraulic pressure fed to a hydraulic cylinder is adjusted based on the detection signal (see FIG. 1). In the case of a power steering device, or in the case of adjusting a steering angle given to a rear wheel (in the case of a four-wheel steering device). For this purpose, conventionally, the rotation angle (and, if necessary, the rotation angular velocity) of the steering shaft is detected by a rotation angle detection device as shown in FIG. This rotation angle detecting device is supported by a pair of tone wheels 2 and 3 externally fixed to an intermediate portion of a steering shaft 1 and a steering column (not shown) and opposed to the outer peripheral surface of the tone wheel 2. And a sensor 5 also supported by the steering column and facing the outer peripheral surface of the tone wheel 3. Each of the tone wheels 2 and 3 is constituted by a permanent magnet. One of the tone wheels 2 has S-poles and N-poles arranged alternately and at regular intervals on the outer peripheral surface thereof in the circumferential direction. Also, the other tone wheel 3 has only one pole in the circumferential direction and a pole different from that of the remaining part (only one pole is an S pole in the illustrated example). [0005] The sensor assembly 4 is formed by combining a pair of sensors. Sensors of this pair, in the circumferential direction, 1/4 (P _2/4) of the pitch P ₂ of the S pole adjacent constituting the tone wheel 2 (or N poles) only shifted Are placed. As the above pair of sensors,
Use the same characteristics. Therefore, when the steering shaft 1 rotates in one direction, as shown by solid lines a and b in FIG. 14, after the output of one sensor rises, it is delayed by 1/4 cycle, and Output rises. When the steering shaft 1 rotates in the other direction, the output of one sensor rises and then the output of the other sensor rises 3/4 cycle later. Therefore, the rotation angle of the steering shaft 1 can be known by counting the number of times that the output of one or both of the pair of sensors constituting the sensor assembly 4 rises. Further, the rotational angular velocity can be known by counting the number of rises per unit time or measuring the rise duration time t. Further, by observing the timing when the outputs of both sensors rise, the rotation direction can be known. Further, as shown by a solid line c in FIG. 14, the output of the sensor 5 rises only once each time the steering shaft 1 makes one rotation. The output of the sensor 5 is used to detect whether or not the steering shaft 1 is at a neutral position (a position at which a steering angle is not applied to the front wheels).
Therefore, when the steering shaft 1 is in the neutral position, the two members 5 and 3 are assembled to the steering column and the steering shaft 1 such that the sensor 5 and the S pole of the tone wheel 3 face each other. SUMMARY OF THE INVENTION A rolling bearing with a rotation angle detecting device according to the present invention is capable of rotating a steering device by incorporating a mechanism for detecting a rotation angle of a steering shaft into a steering device. It is intended to reduce the cost of a steering device with an angle detection function. In the case of the conventional structure shown in FIG. 13, the tone wheels 2, 3, the sensor assembly 4, the sensor 5, and the rolling bearing for supporting the steering shaft 1 inside the steering column are prepared as separate parts. Have been. When configuring the rotation angle detecting device, the components 2 to 5 are independently assembled to the steering shaft 1 and the steering column. Therefore, parts management and assembling work are troublesome, which causes a rise in the manufacturing cost of the rotation angle detecting device. The rolling bearing with a rotation angle detecting device of the present invention has been invented in view of the above-mentioned circumstances. A rolling bearing with a rotation angle detecting device according to the present invention has a first raceway surface, a first raceway which rotates during use, and a first raceway which faces the first raceway surface. A second raceway that has two raceways and does not rotate during use, a plurality of rolling elements provided to be able to roll between the first raceway and the second raceway, and the first raceway An annular tone wheel is supported, and a sensor assembly is supported on the second race. The tone wheel includes a first detector for changing magnetic characteristics in a circumferential direction alternately and at equal intervals;
And a second detecting section in which the magnetic characteristics at one location in the circumferential direction are different from the magnetic characteristics of the remaining portion. Also, the sensor assembly has first and second sensors each facing the first detection unit, and a third sensor facing the second detection unit. Further, the first sensor and the second sensor are arranged so as to be shifted in the circumferential direction. When the magnitude of the displacement between the first and second sensors is L, the period at which the magnetic characteristics of the first detection unit change is P, and k is an integer, L ≠ k · P / 2 The relationship holds. With the rolling bearing with the rotation angle detecting device of the present invention configured as described above, for example, the operation for determining the rotation angle, rotation angular velocity, and rotation direction of the steering shaft supported inside the steering column. Is substantially the same as the above-described conventional rotation angle detecting device. In particular, in the case of the rolling bearing with the rotation angle detecting device of the present invention, the rolling bearing, the tone wheel, the first, second, and third sensors can be handled as a single component that is non-separably combined. Therefore, at the same time as the operation of supporting the steering shaft inside the steering column, the operation of assembling the tone wheel with the first, second, and third sensors can be performed. As a result, parts management and assembling work are simplified, and the manufacturing cost of the rotation angle detecting device can be reduced. 1 to 3 show a first embodiment of the present invention. The inner race 6, which is the first raceway, has an inner raceway 7, which is the first raceway, on its outer peripheral surface. The outer race 8, which is the second raceway, has an outer raceway 9, which is the second raceway, on its inner peripheral surface. A plurality of rolling elements (balls) 10 are provided between the inner raceway 7 and the outer raceway 9 facing each other, so that the inner race 6 and the outer race 8 can rotate relative to each other. In use, the inner ring 6 is fixed to an intermediate portion of the outer peripheral surface of the steering shaft 1 and rotates together with the steering shaft 1. In use, the outer ring 8 is fitted and fixed in the middle of the inner peripheral surface of the steering column 11 and does not rotate. The width W of the inner ring 6 in the axial direction (the left-right direction in FIGS. 1 and 2) is the width w of the outer ring 8 in the axial direction.
(W> w). One end faces (the left end faces in FIGS. 1 and 2) of the inner ring 6 and the outer ring 8 are made to coincide. Therefore, the other end of the inner ring 6 (the right end in FIGS. 1 and 2) and the other end of the outer ring 8 in the axial direction (FIGS. 1 and 2).
(To the right) to form a projection 12.
The tone wheel 13 is externally fitted and fixed to the projection 12. The tone wheel 13 is formed by bending a magnetic metal plate such as a steel plate into an L-shaped cross section to form a cylindrical fitting portion 14.
And an outward flange-shaped rising portion 15 are provided, and the whole is formed in an annular shape. Then, the fitting portion 14 is fitted over the projecting portion 12. As shown in FIG. 3, a large number of notches 16 are formed at equal intervals on the outer peripheral edge of the rising portion 15, and the magnetic characteristics of the rising portion 15 in the circumferential direction are alternately and equally spaced. Has been changed. That is, the rising section 15 functions as a first detecting section. On the other hand, a notch 17 is formed only at one location in the circumferential direction in the fitting portion 14 so that the magnetic characteristics of the notch 17 are different from the magnetic characteristics of the remaining portion. That is, the fitting section 14 functions as a second detecting section. On the other hand, a sensor assembly 18 is supported at the other end (the right end in FIGS. 1 and 2) of the outer ring 8. The sensor assembly 18 includes a cover 19 formed by bending a metal plate into an L shape, and a synthetic resin 2 supported inside the cover 19.
And the first to third sensors 21 to 23 embedded in the synthetic resin 20. One end (left end in FIGS. 1 and 2) of the cover 19 is formed with a stepped portion 24 formed on the outer peripheral surface of the other end of the outer ring 8.
The outer ring 8 is supported by the other end of the outer ring 8 and covers the periphery of the protrusion 12 of the inner ring 6. The first and second sensors 21, 21 of the first to third sensors 21 to 23 held inside the cover 19 via the synthetic resin 20 are provided.
As shown in FIG. 1, each of the sensors 22 includes a permanent magnet 25 and a magnetic sensor 26 magnetized in the axial direction.
Then, the magnetic sensors 26 constituting the respective sensors 21 and 22
Is opposed to the rising portion 15. Therefore,
Magnetic sensor 26 constituting first and second sensors 21 and 22
Changes with the rotation of the rising portion 15 as shown by solid lines α and β in FIGS. The third sensor 23 is provided as shown in FIG.
It has a permanent magnet 27 and a magnetic sensor 28 that are magnetized in the diameter direction (vertical direction in FIG. 2). The magnetic sensor 28 faces the outer peripheral surface of the fitting portion 14. Therefore, the output of the magnetic sensor 28 constituting the third sensor 23 is
It changes as shown by the solid line γ in FIGS. Each sensor 2
The output signals 1, 22, and 23 are appropriately compared with a reference voltage by a comparator to obtain a rectangular wave as shown in FIG. Further, the first sensor 21 and the second sensor 22 are arranged so as to be shifted in the circumferential direction as shown in FIG. The size of the displacement (circumferential length) L of the first and second sensors 21 and 22 is half (P / P) of the pitch P of the notches 16 and 16 formed at equal intervals in the rising portion 15. 2) is a non-integer multiple. That is, when k is an integer, the pitch P between the notches 16, 16, which is the cycle in which the magnetic characteristics of the rising portion 15, which is the first detecting portion, changes, and the magnitude L of the shift L ≠ k · P / 2
L and P are determined so that the following relationship is satisfied. A signal detected by the first to third sensors 21 to 23 is a code 2 derived from the side of the cover 19.
Through 9, it is sent to a controller (not shown) of a power steering device or a four-wheel steering device. Further, in the illustrated embodiment, an outer peripheral edge of a seal plate 30 formed in a ring shape is locked to a portion near one end of the inner peripheral surface of the outer ring 8. And
The inner peripheral edge of the seal plate 30 is brought close to a portion near one end of the outer peripheral surface of the inner ring 6. The rotation angle of the steering shaft 1 supported inside the steering column 11 by the rolling bearing with the rotation angle detection device of the present invention configured as described above,
The operation for determining the rotation angular velocity and the rotation direction is substantially the same as that of the above-described conventional rotation angle detection device. That is, when the steering shaft 1 rotates in one direction, as shown by solid lines α and β in FIG.
The output of the second sensor 22 rises with a delay of / 4 cycle. When the steering shaft 1 rotates in the other direction, as shown by the solid lines α and β in FIG. The output of the sensor 22 rises. Therefore, the rotation angle of the steering shaft 1 can be known by counting the number of times the output of one or both of the first and second sensors 21 and 22 rises. . Further, the rotational angular velocity can be known by counting the number of rises per unit time or measuring the rise duration time. Furthermore, by observing the timing when the outputs of both sensors 21 and 22 rise, that is, the period from when the output of the first sensor 21 rises to when the output of the second sensor 22 rises, the rotation direction can be known. Further, the output of the third sensor 23 is shown in FIGS.
As shown by a solid line γ, the steering shaft 1 rises only once every one rotation. The output of the third sensor 23 detects whether or not the steering shaft 1 is at the neutral position, and is used for measuring the rotational speed of the steering shaft 1. By counting the number of times the outputs of the first and second sensors 21 and 22 rise, the rotation angle is used to know the rotation angle of the steering shaft 1 from the neutral position. In particular, in the case of the rolling bearing with the rotation angle detecting device of the present invention, the tone wheel 13 and the first, second, and third members are used for the rolling bearing including the inner ring 6, the outer ring 8, and the rolling element 10.
Since the third sensors 21, 22, and 23 are inseparably combined, these components 6, 8, 10, 21, 22, 23
Can be handled as a single part. Therefore, at the same time as the operation of rotatably supporting the steering shaft 1 inside the steering column 11, the operation of assembling the tone wheel 13 with the first, second, and third sensors 21, 22, and 23 can be performed. As a result, the parts management and the assembling work are simplified, and the manufacturing cost of the steering device with the rotation angle detecting function can be reduced. FIGS. 6 to 8 show a second embodiment of the present invention. In the case of the present embodiment, a tone wheel 13a is used in which a synthetic resin magnet 32 having an L-shaped cross section is attached to the outer peripheral surface and one surface of a metal core having an L-shaped cross section.
In a part of the synthetic resin magnet 32, S poles and N poles are alternately arranged at equal intervals on the side surface of the outward flange-shaped rising part 33, and this rising part is the first part. It functions as a detection unit. In addition, on the outer peripheral surface portion of the cylindrical portion 34, a pole (N pole in the illustrated example) different from the other portions is disposed only at one location in the circumferential direction.
The cylindrical portion 34 functions as a second detection unit. In the case of this embodiment, the first, second and third sensors 21, 22, and 23 themselves do not have permanent magnets, but are constituted only by magnetic sensors 26 and 28. Other configurations and operations are the same as those of the first embodiment. Next, FIGS. 9 to 11 show a third embodiment of the present invention. In the case of the present embodiment, the tone wheel 13b is formed by attaching a ring-shaped synthetic resin magnet 32a to one surface of a metal core having an L-shaped cross section. S-poles and N-poles are alternately and repeatedly arranged at equal intervals on the outer peripheral portion of the synthetic resin magnet 32a so that the outer peripheral portion functions as a first detector. Further, a pole (N pole in the illustrated example) different from the other parts is arranged only at one position in the circumferential direction on the inner peripheral part, and this inner peripheral part functions as a second detection unit. I am doing it. The width of the inner ring 6a in the axial direction (the horizontal direction in FIGS. 9 and 10) is the same as or slightly shorter than the width of the outer ring 8 in the axial direction. Then, the first and second sensors 21 and 22 supported by the outer ring 8 via the cover 19 and the synthetic resin 20 are located near the outer periphery of the side surface of the synthetic resin magnet 32a, and the third sensor 23 is also located near the inner periphery. Parts are opposed to each other. Other configurations and operations are the same as those of the above-described second embodiment. FIG. 12 shows a fourth embodiment of the present invention. In the case of the present embodiment, a seal piece 35 made of rubber or the like is attached to the outer peripheral edge of the tone wheel 13c over the entire circumference, and the outer peripheral edge of the seal piece 35 is slid on the inner peripheral surface of the outer ring 8. I have. The rubber or the like that constitutes the seal piece 35 has the notch 1
It is safe to get inside 6. In the case of the present embodiment, it is possible to effectively prevent leakage of grease existing in the portion where the rolling element 10 is installed, and prevent foreign matter from entering the portion where the rolling element 10 is installed. Other configurations and operations are the same as those in the first embodiment. Since the rolling bearing with a rotation angle detecting device of the present invention is constructed and operates as described above, the operation of incorporating a mechanism for detecting the rotation angle of the steering shaft into the steering device can be simplified. Thus, the cost of the steering device with a rotation angle detection function can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view corresponding to an AA section and a BB section in FIG. 3, showing a first embodiment of the present invention. FIG. 2 is a half sectional view corresponding to the CC section of FIG. 3; FIG. 3 is a diagram illustrating only the first, second, and third sensors and a tone wheel taken out and viewed from the right in FIGS. FIG. 4 is a diagram showing output changes of first, second, and third sensors when the steering shaft rotates in one direction. FIG. 5 is a diagram showing output changes of first, second, and third sensors when the steering shaft rotates in the other direction. FIG. 6 is a half sectional view corresponding to the DD section and the EE section of FIG. 8, showing the second embodiment of the present invention. FIG. 7 is a half sectional view corresponding to a section taken along line FF of FIG. 8; FIG. 8 is a diagram illustrating only the first, second, and third sensors and the tone wheel taken out and viewed from the right in FIGS. 9 is a half sectional view corresponding to the GG section and the HH section of FIG. 11, showing a third embodiment of the present invention. FIG. 10 is a half sectional view corresponding to the II section in FIG. 11; FIG. 11 is a diagram illustrating only the first, second, and third sensors and the tone wheel taken out and viewed from the right in FIGS. FIG. 12 is a half sectional view showing a fourth embodiment of the present invention. FIG. 13 is a perspective view showing a conventional rotation angle detection device. FIG. 14 is a diagram showing output signals of respective sensors. [Description of Signs] 1 Steering shaft 2, 3 Tone wheel 4 Sensor assembly 5 Sensor 6, 6a Inner ring 7 Inner ring track 8 Outer ring 9 Outer ring track 10 Rolling element 11 Steering column 12 Projection parts 13, 13a, 13b, 13c Tone wheel 14 fit Joint portion 15 Rising portions 16, 17 Notch 18 Sensor assembly 19 Cover 20 Synthetic resin 21 First sensor 22 Second sensor 23 Third sensor 24 Step 25 Permanent magnet 26 Magnetic sensor 27 Permanent magnet 28 Magnetic sensor 29 Code 30 Seal plate 31 core metal 32, 32a synthetic resin magnet 33 rising part 34 cylindrical part 35 seal piece

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[Procedure amendment] [Submission date] May 29, 2002 (2002.5.2)
9) [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]Rolling bearing with rotation status detector [Claims] A first orbital surface having a first raceway surface and rotating during use;
Having one orbital ring and a second raceway surface facing the first raceway surface,
The second race that does not rotate during use, the first raceway surface and the second race
Plural rolling elements provided to be able to roll freely between two raceway surfaces
Supported by the first race, The center of this first race
The magnetic side faces that are perpendicular to the axis
The first and second detected parts whose air characteristics change in the circumferential direction,
Displaced in the radial directionAn annular tone wheel,So
In the state where each is supported by a member that does not rotate, the first
The first and second sensors that face the detection unit in the axial direction,
While being supported by a non-rotating member, the second detected portion
A third sensor facing in the axial direction;
Both sensors are turned on as the tone wheel rotates.
The timing at which the outputs of both sensors change is determined by the tone
To ensure that it differs depending on the direction of rotation of the
Supported in a state shifted in the circumferential direction of the
Of the rotation angle and rotation speed of the tone wheel
At least one and the rotation direction can be freely detected.
Rolling bearing with rotation status detector. DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTIONRotation state detector
Rolling bearingFor example, it is assembled in a steering device of a car.
Into the steering shaftRotation angle and rotation angle speed
At least one of the degrees and the direction of rotationDetect
Use it for [0002] 2. Description of the Related Art A steering device of an automobile is provided with a dash.
Of the cylindrical steering column supported under the board
Inside the steering shaft, for example, deep groove ball bearing
Supported by rolling bearingsCompose. To the front wheel
The steering angle is determined based on the operation of the steering wheel.
Then, the steering shaft is rotated. [0003] By the way, a power steering device or
The four-wheel steering system includes the rotation angle of the steering shaft.
Every time,Direction of rotation,Further, the rotational angular velocity is detected, and this detection signal is output.
The hydraulic pressure sent to the hydraulic cylinder was adjusted based on the
(In the case of a power steering device) or to the rear wheel
To adjust the steering angle (in the case of a four-wheel steering system)
There is. For this reason,FIG.As shown inRotation status detection
Output deviceThe rotation angle of the steering shaftPassing
And rotation direction(And, if necessary, the rotational angular velocity)
I have. [0004]Conventionally known rotational state detector
PlaceIs externally fitted and fixed to the intermediate portion of the steering shaft 1.
In addition, a pair of tone wheels 2 and 3 and a steer (not shown)
For ring columnSupport, Outer periphery of the tone wheel 2
Sensor assembly facing the surfacebody4 and steering wheel
On the ramSupport, Facing the outer peripheral surface of the tone wheel 3
From the sensor 5Compose. Each of the above tone wheels
2 and 3 are each made of permanent magnetCompose. So
Then, one of the tone wheels 2 has an S pole on its outer peripheral surface.
N poles are alternately arranged at equal intervals in the circumferential direction.
ing. Also, the other tone wheel 3 has one circumferential direction.
Only the poles that differ from the rest (one in the example shown)
Only the S pole). The above sensor assemblybody4 is a pair of sensors
Combined. This pair of sensors isOver
RiAdjacent S poles constituting the tone wheel 2
(Or N poles) pitch P_Two 1/4 (P_Two / 4)
They are arranged in a distorted manner. As the above pair of sensors,
Use the same characteristics. Therefore, the steering
Shaft 1Predetermined directionIf you rotate toFIG.To solid line
As shown by a and b, the output of one sensor rises
After a delay of 1/4 cycle, the output of the other sensor rises.
Rise up. Also, the steering shaft 1 isThe above prescribed
Opposite to the directionIf the sensor rotates in one direction,
After the output rises, the other sensor is delayed by 3/4 cycle.
The output of the sensor rises. Accordingly, a pair of sensors constituting the sensor assembly 4
SensorOurEither or both sensors output
If you count the number of times you get up,
The rotation angle of the shaft 1 can be known. Also, per unit time
Count the number of rises
By measuring the duration t, the rotational angular velocity can be known.
Furthermore, observe the timing when the outputs of both sensors rise.
Then you can know the direction of rotation. Further, the output of the sensor 5 isFIG.To solid line
As shown by c, every time the steering shaft 1 makes one rotation
Stand up only once. The output of this sensor 5 is steer
When the ring shaft 1 is in the neutral position (the steering angle is given to the front wheels)
This is used to detect whether or not it is located at a position where it is not known. Obedience
Therefore, the steering shaft 1 is in the neutral position.
When the sensor 5 and the S pole of the tone wheel 3
The two members 5, 3 are attached to the steering column and
And the steering shaft 1. [0008] [Problems to be solved by the invention] [0009]FIG.In the case of the conventional structure shown inTo,tone
Wheel 2, 3, sensor assemblybody4, sensor 5, and even
Support the steering shaft 1 inside the tearing column
Rolling bearing for holdingTo, Available as a separate partDoing
To. AndRotation state detectorWhen configuring
Each of these parts 2 to 5 is independently
And the steering column. Therefore, parts management
And assembling work becomes troublesome,Rotation state detectorMade of
Cause of increased costbecome. [0010] The present inventionRolling bearing with rotation status detector
In consideration of the above situationThe steering system
A mechanism for detecting the rotating state of the ringing shaft is assembled.
The rotation angle and rotation method
Launched to reduce the cost of steering devices with direction detection function
It is clear. [0011] SUMMARY OF THE INVENTIONRotation status detector
Mounted rolling bearingHas a first raceway and rotates during use.
And a second raceway facing the first raceway.
And the second race that does not rotate during use, and the first race surface
Rolling elements provided between the first and second raceways so as to be free to roll
Supported by the body and the first raceInside this first race
On each of the axial side surfaces that exist in the direction orthogonal to the
First and second detected parts whose magnetic properties change in the circumferential direction
Was displaced in the radial direction.Annular tone wheel
When,Above with each supported by a non-rotating member
First and second sensors axially facing the first detected portion;
Similarly, the second test object is supported by a non-rotating member.
A third sensor that faces the protrusion in the axial directionAndGet. [0012]Then, the first and second sensors are
With the rotation of the tone wheel, the output of both sensors
The changing timing is determined by the rotation direction of the tone wheel.
The circle of this tone wheel to make it different according to the difference
This tone wheel is supported with a circumferential shift.
At least one of the rotation angle and the rotation angular velocity of
Detecting rotation direction freely. [0013] [0014] [Function] As described aboveDoOf the present inventionRotation state detector
Rolling bearingFor example, inside the steering column
Angle of steering shaft supported byAnd rotation angle
At least one of the speed and the direction of rotationAsk for
The effect of this is that the conventionalRotation state detectorAlmost the same as
It is like.In addition, the third sensor detects the steering
The neutral position of the shaft can be detected. In particular, the present inventionRolling with rotation status detector
bearingIn the case of rolling bearing and tone wheelAndInseparably
Can be handled as a single, combined part.As well
The first, second and third sensors are combined
In addition, it can be handled as a single component. This result
FruitParts management and assembly workSimplify the rotation angle
And at least one of the rotational angular velocity and the rotational direction are detected.
Rotation state detection deviceProduction cost can be reduced.Also,
The first, second and third sensors are located on the same plane.
Both of the first and second detected parts are axially opposed to each other.
Therefore, the gap between these two detected parts and each of the above sensors is
Adjustment work can be performed easily. [0016] DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS.Examples of the present inventionIs shown.
On the outer peripheral surface of the inner race 6 which is the first race, the first race
Inner ring track 7Have.or,Outer ring which is the second race
8On the inner circumference of, The outer raceway 9 as the second raceway surfaceProvided
Is. Oppose each othertheseInner ring track 7 and outer ring track 9
A plurality of rolling elements (balls) 10 are provided between the inner rings.
The relative rotation between the outer ring 6 and the outer ring 8 is free.Rotating state
DetectorWhen the wheel is used, the inner ring 6 is
In the middle of the outer peripheral surface ofFixed, This steering wheel
Rotate with shaft 1Be free. or,Rotation state detectorof
When used, the outer ring 8 is attached to the inner periphery of the steering column 11.
Inner fit in the middle of the surfaceFixedDoes not rotateState. [0017]In the case of this embodiment, the tone wheel 13
A ring-shaped composite is formed on one side of a core metal 31 having an L-shaped cross section.
A magnet with a resin magnet 32 attached is used. Soshi
The cylindrical portion formed on the inner peripheral edge of the cored bar 31 is
Sandwiched between the inner peripheral surface of the inner ring 6 and the outer peripheral surface of the sleeve.
You. Further, in the portion near the outer periphery of the synthetic resin magnet 32,
S pole and N pole alternately and repeatedly arranged at equal intervals
However, this outer peripheral portion functions as a first detected portion.
I have to. Also, in the part near the inner circumference, one place in the circumferential direction
Only, a different pole (N pole in the example shown)
And this inner peripheral part functions as the second detected part.
I am trying to. [0018] On the other hand,the aboveThe other end of the outer ring 8 (right of FIGS. 1 and 2)
Sensor assembly at the end)body18 is supported. This section
Sensor assemblybody18 is, GoSynthetic resin 20 and synthetic resin 20
And first to third sensors 21 to 23 embedded therein.
You.In the case of this embodiment, the synthetic resin 20 is made of gold.
Supporting the inside of a cover 19 formed by bending a metal plate into an L shape
are doing. One end of the cover 19 (the left end in FIGS. 1 and 2)
) Is a stepped portion 24 formed on the outer peripheral surface of the other end of the outer ring 8.
ToBy externally fitting with an interference fitAt the other end of the outer ring 8
supportFixed. Inside such a cover 19,the above
The first to third sensors 21 to 23 are wrapped in the synthetic resin 20.
It holds the embedded sensor assembly 18. [0021]In the case of this embodiment, the axial direction of the inner ring 6 (see FIG.
1, 2) is the axial direction of the outer ring 8
The width is the same or slightly shorter. And
Supported on outer ring 8 via cover 19 and synthetic resin 20
The first and second sensors 21 and 22 are connected to the synthetic resin magnet 3 described above.
Similarly, the third section is attached to the first portion to be detected,
The sensor 23 is attached to the second portion to be detected near the inner circumference.
Facing. Therefore, the first and second sensors 21 and 22
The output signal of
Then, as shown by the solid lines a and b in FIG.
The output signal of the reference numeral 23 also changes as indicated by the solid line c.
You. Further, the first sensor 21 and the second sensor 22
Are arranged so as to be shifted in the circumferential direction as shown in FIG.
I have. The size of the displacement between the first and second sensors 21 and 22
(Length in the circumferential direction) L isSide view of the synthetic resin magnet 32
Between the S poles (or N poles)pitch
It is a non-integer multiple of half of P (P / 2). That is, k
When an integer is used, the aboveOuter side
PartIs the cycle at which the magnetic properties of theS pole (or N
Poles)Between the pitch P and the magnitude L of the deviation,
L and P are changed so that the relation of L ≠ k · P / 2 holds.
It has established.Therefore, the rotation of the tone wheel 13
Accordingly, the outputs of the first and second sensors 21 and 22 change.
The timing at which these are performed is apparent from the solid lines a and b in FIG.
As you can see, the difference in the rotation direction of the tone wheel 13
Depends on. The first to third sensors 21 to 23 detect
Signal derived from the side of the cover 19Harness
29, power steering system and four-wheel steering system
(Not shown). Also, in the illustrated embodiment,
Is formed in a ring shape at a portion near one end of the inner peripheral surface of the outer ring 8.
The outer peripheral edge of the sealed plate 30 is locked. And this
Of the inner peripheral edge of the inner ring 6
Close to the partOf the part where the rolling element 10 is installed
Close the end openingI have. Configuration as described aboveDoOf the present inventionRotation status detection
Rolling bearing with deviceBy the inside of the steering column 11
Rotation angle of the steering shaft 1 supported on the side
The function of determining the turning angle speed and the rotation direction is
ofRotation state detectorIt is almost the same as [0025That is, the steering shaft 1 isPredetermined
directionIf you rotate toFIG.To solid linea, bAs shown in
After the output of the first sensor 21 rises,
The output of the second sensor 22 rises after a delay of ４ cycle.
You. Also, the steering shaft 1 isWith the above predetermined direction
Is the oppositeWhen rotated in the directionThe firstOutput of sensor 21
After rising, for example, 3/4 cycle later,
The output of the sensor 22 rises. Therefore, the first and second sensors 21 and 22U
ChinoThe output of one or both sensors 21 and 22
If you count the number of times you get up,
The rotation angle of the shaft 1 can be known. Also, per unit time
Count the number of rises
By measuring the duration, the rotational angular velocity can be known. Change
And the output of both sensors 21 and 22 rises
That is, after the output of the first sensor 21 rises,
Until the output of the two sensors 22 risestimeObserve
You can know the direction of rotation. Further, the output of the third sensor 23 isIn FIG.
Line c, The steering shaft 1 makes one rotation
Stand up only once each time. The output of this third sensor 23
Determines whether the steering shaft 1 is in the neutral position.
To detect the rotation of the steering shaft 1
UseI do. In addition, the output of the third sensor 23 isthis
First and second after the output of the third sensor 23 rises
Count the number of rising edges of the outputs of the sensors 21 and 22
ThingsByIs the steering shaft 1 in the neutral position?
Use to know their rotation angleDo. In particular,Rolling shaft with rotation status detection device of this example
Receivingin the case ofTo, Consisting of an inner ring 6, an outer ring 8, and a rolling element 10.
For the rolling bearing, the tone wheel 13 and the first and second
Combining the second and third sensors 21, 22 and 23 in a non-separable manner
Letting. thisTherefore, these components 6, 8, 10, 13,
21, 22, and 23 can be handled as a single part. Obedience
The steering column inside the steering column 11.
At the same time that the shaft 1 is rotatably supported,
Eel 13 and first, second and third sensors 21, 22, 23
Can be assembled. As a result, parts management and
Assembly work is simplified,Rotation angular velocity, rotation angle and
Rotation state such as rotation directionManufacture of steering device with detection function
Cost reduction can be achieved. [0029] [0030] [0031] [0032] [0033] [0034] According to the present invention,Rolling bearing with rotation status detector
Is configured and works as described aboveBecause, Steari
Of the steering shaft to the steering deviceRotation angle, rotation angle speed
Degree of rotation, rotation direction, etc.Built-in mechanism for detecting
Simplified workIt is. Therefore, the rotation angle and rotation method
Rotation state detection device such as steering device with direction detection function
Various devices incorporatedCan be reduced. [Brief description of the drawings] FIG.Embodiment of the present inventionAA cross section of FIG.
The half sectional view corresponding to BB cross section. 2 is a half section corresponding to the section CC in FIG. 3;
FIG. FIG. 3 shows only the first, second, and third sensors and the tone wheel.
FIG. 3 is a view taken from the right side of FIGS. [FIG.】TraditionalRotation state detectorFIG. [FIG.A diagram showing an output signal of each sensor. [Explanation of symbols] 1 Steering shaft 2,3 tone wheel 4 Sensor assemblybody 5 Sensor6   Inner ring 7 Inner ring track 8 Outer ring 9 Outer ring track 10 rolling elements 11Steering column 13 Tone Wheel 18   Sensor assembly 19 Cover 20 synthetic resin 21 First sensor 22 Second sensor 23 Third sensor 24Step 29 harness 30 Seal plate 31 core32 Synthetic resin magnet [Procedure amendment 2] [Document name to be amended] Drawing [Correction target item name] All figures [Correction method] Change [Correction contents] FIG. FIG. 2 FIG. 3 FIG. 4 FIG. 5

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Claims (1)

Claims: 1. A first raceway having a first raceway surface and rotating during use, and a second raceway surface facing the first raceway surface,
A second raceway that does not rotate during use, a plurality of rolling elements rotatably provided between the first raceway surface and the second raceway surface, and an annular ring supported by the first raceway ring A tone wheel; and a sensor assembly supported by the second race, wherein the tone wheel has a first detection unit in which magnetic characteristics in a circumferential direction are alternately and equally changed, and a circumference. A second detecting unit having a magnetic property in one direction different from a magnetic property of the remaining part, wherein the sensor assembly includes first and second sensors each facing the first detecting unit; A first sensor and a second sensor are arranged so as to be shifted in the circumferential direction, and the magnitude of the shift between the first and second sensors is L; When the period in which the magnetic characteristics of the first detection unit change is P, and k is an integer, L k · P / 2 relationship holds rotation angle sensing rolling bearing.