JPH10227802A - Sensor rotor for detection of rotational speed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sensor rotor whose costs are not increased, in which the rigidity of a circular ring part is increased so as prevent its deformation and whose accuracy is enhanced by a method wherein cylindrical parts are formed on both the inner peripheral edge and the outer peripheral edge of the circular ring part. SOLUTION: A sensor rotor 14a is formed integrally by pressing and forming a metal plate, its cross-sectional shape is nearly J-shaped, and its whole part is formed to be a circle shape. A first cylindrical part 15 is formed on the inner peripheral edge of a circular ring part 19, and a second cylindrical part 16 is formed on the outer peripheral edge of the circular ring part 9. Many slit-shaped through holes 10 which are formed in a radial direction at equal intervals over the circumferential direction are formed in the circular ring part 9. Then, the circular ring part 9 is used as parts, to be detected, in which characteristics to be detected are changed alternately and at equal intervals over the circumferential direction. In addition, the cross-sectional shape in the tip edge part of the first cylindrical part 15 is formed to be a wedge shape. Thereby, the rigidity of of the circular ring part 9 is increased sufficiently, and it is possible to prevent the circular ring part 9 from being deformed while the circular ring part is being conveyed or when the circular ring part is assembled to a hub 1. As a result, a rotational speed can be detected at low costs and with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The rotational speed detecting sensor rotor according to the present invention is incorporated in, for example, an anti-lock brake system (ABS) or a traction control system (TCS) for an automobile to detect the rotational speed of a wheel. Use.

[0002]

2. Description of the Related Art In various types of mechanical devices, the rotational speed of a shaft is detected. For example, in the case of ABS or TCS, the rotation speed of a wheel during braking is conventionally detected by a rolling bearing unit for detecting rotation speed. A rolling bearing unit constituting a rolling bearing unit for detecting a rotational speed used in such a case will be described with reference to FIG. 2 showing a use state of a first example of an embodiment of the present invention. A flange 2 for fixing a wheel (not shown) is fixed to the outer peripheral surface of the hub 1. The inner peripheral surface of the hub 1 has double rows of outer raceways 3,3. or,
A pair of inner rings 4, 4 are arranged inside the hub 1, and these two inner rings 4, 4 can be externally fitted and supported on a suspension device (not shown). A plurality of rolling elements 6, 6 are provided between the inner raceways 5, 5 formed on the outer peripheral surfaces of the inner races 4, 4 and the outer raceways 3, 3, respectively. The hub 1 is rotatably supported around the hub 4. In the illustrated example, balls are used as the rolling elements 6, 6, but in the case of a heavy-duty rolling bearing unit for an automobile, tapered rollers may be used as the rolling elements. The bearing unit has a structure in which the outer raceways 3, 3 are formed directly on the inner peripheral surface of the hub 1 as shown in FIG. 2, and the inner peripheral surface of the hub is formed in a cylindrical shape. There is also a structure in which an outer ring having an inner raceway formed on its inner peripheral surface is internally fitted and fixed inside the hub.

A rolling bearing unit as described above is constructed,
In order to detect the rotation speed of the hub 1 rotating with the wheels, a sensor rotor is fitted and fixed to one end (the left end in FIG. 2) of the hub 1 which is a rotating member. Then, a sensor (not shown) supported on a part of a suspension device (not shown), which is a stationary member that does not rotate, is opposed to a part of the sensor rotor to constitute a rotation speed detecting device. As described above, as a sensor rotor constituting a rolling bearing unit for detecting a rotational speed in combination with a rolling bearing unit, for example, Japanese Patent Application Laid-Open No. 63-246677 discloses a sensor rotor 7a as shown in FIG. 393
No. 22 discloses a sensor rotor 7 as shown in FIGS.
b and 7c are respectively described.

First, a sensor rotor 7a of a first example of a conventional structure shown in FIG. 19 is formed by bending a magnetic metal plate such as a mild steel plate to have an L-shaped cross-section as a whole. A cylindrical portion 8 that can be fitted and fixed externally to one end of the hub 1 by interference fit, and a circular ring portion 9 that is bent diametrically outward from one edge (the left edge in FIG. 19) of the cylindrical portion 8 are provided. . By forming a large number of through holes 10 each having a slit shape in the radial direction and equally spaced from each other in the circumferential direction in the circular ring portion 9 among them, the circular ring portion 9 is formed. The detected portion is a portion to be detected in which the detected characteristics are changed alternately at regular intervals in the circumferential direction.

The sensor rotors 7b and 7c of the second to third examples of the conventional structure shown in FIGS. 20 to 21 each have a U-shaped cross section formed by press-forming a magnetic metal thin plate such as a mild steel plate. The one element 11 and the second element 12 are combined in the middle state, and the whole is formed in an annular shape with a rectangular cross section. Then, on one axial side portion (the left side surface in FIGS. 20 to 21),
By forming a large number of through-holes 10 each having a slit shape in the radial direction and at equal intervals in the circumferential direction, the above-mentioned one side portion is alternately formed in the circumferential direction. At the same time and at equal intervals.

The sensor rotors 7a to 7c as shown in FIGS. 19 to 21 are externally fitted and fixed to one end of the hub 1 to form a rolling bearing unit for detecting a rotational speed. If you configure the device,
As the sensor rotors 7a, 7b, 7c rotate with the hub 1, the output voltage of the sensor changes. Since the frequency at which the output voltage of the sensor changes in this way is proportional to the rotation speed of the hub 1, if the output signal of the sensor is input to the controller, the rotation speed of the wheel fixed to the hub 1 is increased. (Rotational speed).

[0007]

The sensor rotors 7a, 7b and 7c as shown in FIGS. 19 to 21 are desired to be improved in the following points. First, in the case of the sensor rotor 7a of the first example of the conventional structure shown in FIG. 19, the rigidity of the circular ring portion 9 is low, and when the sensor rotor 7a is transported alone, or when the sensor rotor 7a is detached from the hub 1, At the time of fitting and fixing, the annular portion 9 is easily plastically deformed. If the accuracy of the shape of the to-be-detected portion, that is, the annular portion 9 having the through-hole 10 is deteriorated, it becomes difficult to accurately detect the rotational speed. For this reason, a structure for increasing the rigidity of the ring portion 9 is desired.

Further, the second structure of the conventional structure shown in FIGS.
In the case of the sensor rotors 7b and 7c of the first to third examples, although the rigidity of the portion where the through hole 10 is formed can be sufficiently ensured, there are the following problems. First, in order to securely connect the first and second elements 11 and 12 to each other, it is necessary to ensure sufficient shape accuracy and dimensional accuracy of these two elements 11 and 12. For this reason, the manufacturing cost of the sensor rotors 7b and 7c increases, in addition to the necessity of a process for fitting these two elements 11 and 12 together.
Further, foreign matter such as muddy water that has entered through the through hole 10 into the internal space 13 of each of the sensor rotors 7b and 7c easily stays in the internal space 13 as it is. Corrosion may progress from inside to 7c. For this reason, anticorrosion treatment is required, and the production cost is further increased. Further, when foreign matter such as muddy water enters the internal space 13, the running performance of the vehicle, especially the riding comfort, may be deteriorated due to the increase in unsprung load. The rotational speed detection sensor rotor of the present invention has been invented to solve any of these problems.

[0009]

All of the sensor rotors for detecting a rotational speed according to the present invention are integrally formed by pressing a metal plate in the same manner as a conventionally known sensor rotor. It has a detected part which is fitted and fixed to the peripheral surface and which constitutes a rotation speed detecting device for detecting the rotation speed of the rotating member by being combined with a sensor supported by a stationary member.

[0010] In particular, the rotation speed detecting sensor rotor according to the first aspect is formed on a circular ring portion and one of the inner and outer peripheral edges of the circular ring portion facing the peripheral surface of the rotating member. A first cylindrical portion that can be freely fitted and fixed to the peripheral surface; and a second cylindrical portion formed on the other of the inner and outer peripheral edges of the circular ring portion, the peripheral edge being separated from the peripheral surface of the rotating member. The detected characteristics of the annular portion are changed alternately and at equal intervals in the circumferential direction to form the detected portion.

According to a second aspect of the present invention, there is provided a sensor rotor for detecting a rotational speed, which is formed on a circular portion and at one of inner and outer peripheral edges of the circular portion facing the peripheral surface of the rotating member. And a fixed cylindrical portion that can be fitted and fixed on the peripheral surface.
The annular portion is formed by folding a part of the metal plate by 180 degrees at a portion opposite to the fixed cylindrical portion to form a folded portion, and by overlapping both sides of the folded portion with each other, the metal plate 2 It has the thickness of the sheet. In such a ring portion, the detected characteristics are changed alternately and at equal intervals in the circumferential direction to form the detected portion.

[0012]

The rotational speed detecting sensor rotor according to the present invention having the above-described structure can be used without increasing the cost.
By increasing the rigidity of the annular portion, deformation of the annular portion can be prevented. For this reason, it is possible to realize a rotation speed detecting device capable of detecting rotation speed with high accuracy at low cost.

[0013]

1 to 3 show a first embodiment of the present invention corresponding to claim 1. FIG. The sensor rotor 14a of this example is integrally formed by press-molding a metal plate, has a substantially J-shaped cross-section, and has an overall annular shape. The material of the metal plate used to form the sensor rotor of the present example and the second to twelfth examples described later is appropriately selected depending on the type of a sensor (not shown) combined with the sensor rotor of each example. For example, when the sensor is a magnetic sensor that changes its output according to a change in magnetism, a magnetic metal plate such as a mild steel plate is used as the metal plate. On the other hand, when the sensor is a photoelectric sensor, the material of the metal plate does not matter.

In any case, the sensor rotor 14a
A circular cylindrical portion 9, a first cylindrical portion 15 formed on an inner peripheral edge of the circular ring portion 9, a second cylindrical portion 16 formed on an outer peripheral edge of the circular ring portion, and a circular At equal intervals around the circumference,
And a large number of slit-shaped through holes 10 formed in the radial direction. The annular portion 9 is a detected portion in which the detected characteristics are changed alternately and at equal intervals in the circumferential direction. The inner peripheral surface and the outer peripheral surface of the first cylindrical portion 15 (right edge in FIG. 1) are inclined in such a direction that the thickness decreases toward the front edge, and the cross-sectional shape of the front edge is reduced. Is wedge-shaped.

To combine the sensor rotor 14a and the rolling bearing unit as described above to form a rolling bearing unit for detecting a rotation speed of a wheel, a first cylindrical portion of the sensor rotor 14a is required. 15 in FIG.
As shown in FIG. 3, the outer peripheral surface of the hub 1 is tightly fitted to the outer peripheral surface of the hub 1 by interference fit, or the inner peripheral surface of the hub 1 is tightly fixed to the inner peripheral surface of one end by tight fit as shown in FIG. Since the cross-sectional shape of the distal end portion of the first cylindrical portion 15 is wedge-shaped as described above, the above-described fixing operation can be easily performed. still,
On the inner peripheral surface of one end portion of the hub 1 constituting the rolling bearing unit shown in FIG. 3, the first cylindrical portion 15 is internally fitted and fixed. A surface portion is provided. Since the structure of the other parts of the rolling bearing unit has been described above, a duplicate description will be omitted.

The sensor rotor 14a which is constructed as described above and which constitutes the rolling bearing unit for detecting the rotational speed in combination with the rolling bearing unit as described above can be made only by a simple press working. There is no.
Further, the first cylindrical portion 15 is formed on the inner peripheral edge of the circular ring portion 9 having the through hole 10 for detecting the rotational speed, and the second cylindrical portion 16 is formed on the outer peripheral edge. By making the rigidity of the circular ring portion 9 serving as the detecting portion sufficiently high, it is possible to prevent the circular ring portion 9 from being deformed during transportation or when assembled to the hub 1. For this reason, it is possible to realize a rotation speed detecting device capable of detecting rotation speed with high accuracy at low cost.

Next, FIGS. 4 to 6 show a second example of the embodiment of the present invention, which also corresponds to claim 1. FIG. The sensor rotor 14a of the first example described above has a second cylindrical portion 16 for reinforcing the annular portion 9 and a diametrically outer side of the first cylindrical portion 15 for fitting and fixing the sensor rotor 14a to the hub 1. Whereas the sensor rotor 14b of this example is
A second cylindrical portion 16 for reinforcement is provided diametrically inside the first cylindrical portion 15 for fixing. That is, the sensor rotor 14b of the present example is formed on the annular portion 9 that is the portion to be detected, the first cylindrical portion 15 formed on the outer peripheral edge of the circular portion 9, and the inner peripheral edge of the annular portion 9. A second cylindrical portion 16 and a large number of slit-shaped through holes 10 formed radially at equal intervals in the circumferential direction in the circular ring portion 9 are provided. That is, the sensor rotor 14b of the present example is configured such that the inside and outside of the sensor rotor 14a in the diametric direction are reversed with respect to the sensor rotor 14a of the first example described above.

In order to form a rolling bearing unit for detecting a rotation speed of a wheel by combining the sensor rotor 14b and the rolling bearing unit as described above, a first cylindrical portion of the sensor rotor 14b is required. 15 to FIG.
As shown in FIG. 5, the inner peripheral surface of the hub 1 is tightly fitted to the inner peripheral surface of the hub 1 by interference fit, or as shown in FIG. The first cylindrical portion 15 is fixed to the inner peripheral surface of one end of the hub 1 constituting the rolling bearing unit shown in FIG. Is provided with a cylindrical surface portion having a length as long as it can fit inside. Other configurations and operations are the same as those of the above-described first example, and thus redundant description will be omitted.

FIG. 7 shows a third embodiment of the present invention corresponding to claim 2. The sensor rotor 14c of the present example radiates the circular ring portion 9a, the fixed cylindrical portion 17 formed on the inner peripheral edge of the circular ring portion 9a, and the circular ring portion 9a at regular intervals in the circumferential direction. And a large number of slit-shaped through holes 10 formed in the directions. The above-described ring portion 9a, which is a portion to be detected, which constitutes the sensor rotor 14c of the present example.
Has a thickness corresponding to two metal plates constituting the sensor rotor 14c. That is, a part of this metal plate is folded back 180 degrees at the outer peripheral edge portion of the annular portion 9a toward the fixed cylindrical portion 17 to form a folded portion 18, and both sides of the folded portion 18 are overlapped with each other. Together,
The ring portion 9a is used. The cross-sectional shape of the distal end portion of the fixed cylindrical portion 17 is a wedge shape, like the distal end portion of the first cylindrical portion 15 of the sensor rotor of the first example described above.

The sensor rotor 1 of the present embodiment configured as described above
4c can be made only by a relatively simple press working, so that the cost is not particularly increased. Further, since the annular portion 9a in which the through hole 10 for detecting the rotational speed is formed has the thickness of two metal plates, the rigidity of the annular portion 9a is sufficiently increased so that the annular portion 9a is being transported or At the time of assembling to the hub 1, it is possible to prevent the annular portion 9a from being deformed. For this reason, it is possible to realize a rotation speed detecting device capable of detecting rotation speed with high accuracy at low cost.

Further, in the case of the structure of the present embodiment, the output of the magnetic sensor can be increased when a magnetic rotational speed detecting device is configured in combination with the magnetic sensor. That is,
Since the thickness dimension of the annular portion 9a can be increased, when the sensor rotor 14c is formed of a magnetic metal plate such as a mild steel plate and the detection unit of the sensor is opposed to the annular portion 9a, the output of the sensor changes. To increase the accuracy of rotation speed detection. The reason for this is that the amount of magnetic flux flowing in the sensor greatly changes at the moment when the detection unit of the sensor faces the through hole 10 and at the moment when it faces the column between adjacent through holes.

In order to form a rolling bearing unit for detecting a rotation speed of a wheel by combining the sensor rotor 14c of this embodiment with a rolling bearing unit, the fixed cylindrical portion 17 must be provided with a bearing unit. The inner end is fixed to one end of the hub 1 by the interference fit or the outer end is fixed as shown in FIG.

FIG. 9 shows a fourth embodiment of the present invention, which also corresponds to claim 2. While the sensor rotor 14c of the third example described above has the folded portion 18 provided diametrically outside the fixed cylindrical portion 17,
In the sensor rotor 14d of this example, the folded portion 18 is provided inside the fixed cylindrical portion 17 in the diameter direction. That is, the sensor rotor 14d according to the present embodiment includes the circular ring portion 9a and the circular ring portion 9
a fixed cylindrical portion 17 formed on the outer peripheral edge of the circular ring portion 9
a, a folded portion 18 formed on the inner peripheral edge of the
a is provided with a plurality of slit-shaped through holes 10 formed in the radial direction at equal intervals in the circumferential direction. That is, the sensor rotor 14d of the present example is different from the sensor rotor 1 of the third example described above.
4c, the inside and outside in the diametric direction are reversed.

In order to form a rolling bearing unit for detecting a rotating speed of a wheel by combining the sensor rotor 14d and the rolling bearing unit as described above, a fixed cylindrical portion 17 of the sensor rotor 14d is required. The hub 1
Is internally fixed by an interference fit as shown in FIG. 5 or externally fixed by an interference fit as shown in FIG. Other configurations and operations are the same as those of the above-described third example, and thus redundant description will be omitted.

Next, FIGS. 10 to 11 show fifth to sixth examples of the embodiment of the present invention, which also corresponds to claim 2. FIG. In each of the sensor rotors 14c and 14d of the third example and the fourth example described above, a part of the metal plate is folded 180 degrees toward the fixed cylindrical portion 17 at the peripheral portion of the annular portion 9a. In the case of the fifth and sixth examples, a part of the metal plate is attached to the peripheral portion of the circular ring portion 9a on the side opposite to the fixed cylindrical portion 17 by 180 degrees.
The folded part 18a is formed by being folded every time. The configuration and operation of the sensor rotors 14e and 14f of the fifth to sixth examples are the same as those of the third example described above or the fourth example described above, except that the folding direction of the folded portion 18a is reversed.

Next, FIGS. 12 and 13 show seventh and eighth examples of the embodiment of the present invention, which also corresponds to claim 2. FIG. The sensor rotors 14c and 14d of the third and fourth examples described above.
And the sensor rotors 14e and 14f of the fifth to sixth examples described above.
Each of the sensor rotors 14g and 14h in the seventh to eighth examples has a structure in which the fixed cylindrical portion 1
The portion 7a also overlaps two metal plates. In the case of such sensor rotors 14g and 14h of the seventh and eighth examples, the rigidity of the fixed cylindrical portion 17a as well as the circular ring portion 9a increases, so that the hub 1 (FIGS. 2, 3, 5, 6, and 8). Of the sensor rotors 14g and 14h can be improved. Other configurations and operations are the same as those in the third and fourth examples described above.

In the case of the sensor rotors 14a to 14g of the first to eighth examples described above, since the detected characteristics of each of the ring portions 9, 9a are alternately changed in the circumferential direction, these are set. It is not always necessary to form the through-hole 10 as described above in each of the ring portions 9 and 9a. For example, the respective annular portions 9 and 9a can be alternately magnetized to the S-pole and the N-pole, or the reflection characteristics of the side surfaces of the respective annular portions 9 and 9a can be alternately changed. In short, it is only necessary that the detected characteristics of the above-described annular portions 9 and 9a, which are the detected portions, change alternately and at equal intervals in relation to the sensor combined with the detected portions.

Next, FIGS. 14 and 15 show a ninth embodiment of the present invention, which also corresponds to claim 2. FIG.
Since the sensor rotor 14c of the third example shown in FIG. 7 described above alternately changes the detection characteristics of the circular ring portion 9a as the detected portion in the circumferential direction, both side surfaces of the circular ring portion 9a are changed. While a large number of through holes 10 are formed in a penetrating state, the sensor rotor 14i of the present example has a surface on the side facing the sensor (the left side surface in FIGS. Are formed radially. That is,
The annular portion 9a is formed by punching out only one side (the left side in FIG. 14) of the metal plate superimposed to constitute the annular portion 9a and facing the sensor. Are formed at regular intervals in the circumferential direction.

In the case of the sensor rotor 14i of the present embodiment as described above, the metal plate for punching out the metal plate for changing the detection characteristic of the annular portion 9a is formed only on one side of the annular portion 9a. Not applied. For this reason, even if the magnetic rotation speed detecting device is configured by combining the sensor rotor 14i of the present embodiment and the magnetic sensor, the output of the magnetic sensor is smaller than when the sensor rotor 14c of the third embodiment is used. Cannot be increased. However, since no through-hole is formed on the surface that does not face the magnetic sensor, the rigidity of the annular portion 9a can be further increased as compared with the case of the sensor rotor 14c of the third example described above.

In order to form a rolling bearing unit for detecting a rotation speed of a wheel by combining the sensor rotor 14i and the rolling bearing unit as described above, a fixed cylinder constituting the sensor rotor 14i is required. Part 17
As shown in FIG. 15, the fixed cylindrical portion 17 is externally fitted and fixed to the end of the hub 1 by interference fitting, or the fixed cylindrical portion 17 is attached to one end of the hub 1 constituting the rolling bearing unit. The inner fit is fixed by interference fit. The bearing units shown in FIGS.
In each case, the outer ring raceways 3, 3 are formed directly on the inner peripheral surface of the hub 1. On the other hand, the bearing unit for fixing the sensor rotor 14d according to the present embodiment places the outer raceways 3, 3 inside the hub 1. It is formed on the inner peripheral surface of the outer ring 20 that is fixed inside. It is to be noted that the sensor rotor 14i of the present embodiment can be incorporated in the bearing units shown in FIGS. 2, 3, 5, 6, and 8, respectively.
4h can be incorporated in the rolling bearing unit shown in FIG.

Although not shown, like the above-described sensor rotor 14i of the present embodiment, in order to change the detection characteristic of the circular portion 9a which is the detected portion, each of the circular portions 9a constituting the circular portion 9a is changed. Of the superposed metal plates, by punching only one metal plate facing the sensor to form a large number of concave grooves 19 on one side surface of the circular ring portion 9a, the above described fourth to fourth embodiments are described. Eight examples of each sensor rotor 14d, 14
e, 14f, 14g, and 14h. However, in this case, these sensor rotors 14d, 14e, 1
4f, 14g, and 14h are made of magnetic metal plates, and these sensor rotors 14d, 14e, 14f, 14g, 1
The sensor combined with 4h is a magnetic sensor.

Next, FIGS. 16 and 17 show tenth to eleventh embodiments of the present invention. These tenth to eleventh
Each of the sensor rotors 14j and 14k of the example is detected in the concave groove 19 formed in the annular portion 9a of the sensor rotor 14i of the ninth example shown in FIGS. By filling the material 21 having different characteristics, the detected characteristics in the circumferential direction of the annular portion 9a are changed alternately and at equal intervals. As the material 21 to be filled in the concave groove 19, for example, when a magnetic sensor is used as a sensor, a permanent magnet such as a rubber magnet mixed with ferrite powder is used. A material having a different light reflectance from the metal plate forming the sensor rotors 14j and 14k can be used. In this case, as in the eleventh example shown in FIG. 17, the sensor rotor 14k provided with the material 21 continuously over the entire circumference.
In the case of (1), the direction of magnetization of the permanent magnet is made different between the concave groove 19 and the part outside the concave groove 19 (when combined with a magnetic sensor), or a transparent or translucent material is used. (When combined with a photoelectric sensor).

Of the sensor rotors 14j and 14k, the tenth example of the sensor rotor 14j shown in FIG.
The material 21 is filled in the concave groove 19 by an amount just filling the concave groove 19. On the other hand, the sensor rotor 14k of the eleventh example shown in FIG. 17 allows a part of the material 21 to enter the groove 19, It is provided to extend to the periphery of the opening and is provided continuously over the entire circumference. In the case of the sensor rotor 14k of the eleventh example configured as described above, even if the position of the concave groove 19 formed in the circular ring portion 9a is slightly shifted in the diameter direction from the specified position in the manufacturing stage of the sensor rotor 14k. By restricting the position of the portion of the material 21 to be filled later into the concave groove 19 and located outside the concave groove 19, the detection target and the sensor provided on one surface of the circular ring portion 9a are provided. And the rotation speed can be detected with high accuracy.

As described above, in each of the sensor rotors 14j and 14k of the tenth to eleventh examples, the detection characteristic of one surface of the circular ring portion 9a is changed by the material 21 filled in the concave groove 19. It is preferable to use a non-magnetic metal plate as a metal plate for forming the sensor rotors 14j and 14k. However, the material 21 may be a rubber magnet and used in combination with a ferromagnetic metal plate. Other configurations and operations are the same as those in the case of the ninth example shown in FIGS.

Although not shown, the metal plates constituting the sensor rotors 14j and 14k are different from the metal plates constituting the sensor rotors 14j and 14k in the concave grooves 19 formed in the circular ring portion 9a like the sensor rotors 14j and 14k described above. Changing the detected characteristic on one side of the circular ring portion 9a by filling the material 21 having the detected characteristic can be achieved by changing each of the sensor rotors 14a of the first to eighth examples shown in FIGS. The present invention can also be applied to the through-holes 10 of the circular ring portions 9 and 9a of 14h to 14h. In this case, the material 21 is filled in the through holes 10 of the sensor rotors 14a to 14h.

Next, FIG. 18 shows a twelfth embodiment of the present invention. The sensor rotor 14c of the third example shown in FIG.
While a large number of through holes 10 are formed in the annular portion 9a so as to be alternately and equally spaced in the circumferential direction, the sensor rotor 14m of the present embodiment has
Instead of forming 0, a ring-shaped encoder 22 is attached to one surface of the ring portion 9a facing the sensor. The detected characteristics of the encoder 22, which constitutes a detected portion together with the ring portion 9a, are changed alternately and at equal intervals in the circumferential direction. When a magnetic sensor is used as the sensor, a permanent magnet such as a rubber magnet mixed with ferrite powder is used as a material of the encoder 22. When a photoelectric sensor is used as the sensor, the material of the encoder 22 does not matter, but the reflection characteristics of the side surface facing the sensor are changed in the circumferential direction.

As described above, the sensor rotor 14m of the present embodiment
Indicates the detected characteristic of one side of the ring 9a.
The material of the metal plate for forming the sensor rotor 14i is not particularly limited, since it is changed by the encoder 22 attached to one surface of the sensor rotor 14i. Other configurations and operations are the same as those of the third embodiment.
Since this is the same as in the example, duplicate description will be omitted.
Although not shown, an encoder 22 is attached to one surface of the circular ring portion 9a, as in the case of the sensor rotor 14m, to change the detection characteristic of one surface of the circular ring portion 9a constituting the detected portion. It is the first to the first shown in FIGS.
It is also applicable to each of the eight sensor rotors 14a to 14h.
In this case, the through holes 10 of these sensor rotors 14a to 14h are omitted, and the encoder 22 is attached instead.

As is apparent from the above description, in any of the above-described examples, the detected characteristic of each of the annular portions 9 and 9a is changed so as to alternately change in the circumferential direction. When a large number of through holes 10 are formed in 9, 9a, it is not always necessary to form such through holes 10. For example, S-poles and N-poles may be alternately magnetized on the respective ring portions 9 and 9a, or the reflection characteristics of the side surfaces of the respective ring portions 9 and 9a may be alternately changed.

[0039]

The rotational speed detecting sensor rotor according to the present invention is constructed and operates as described above, so that it can contribute to the realization of a rotational speed detecting device which can detect the rotational speed with low cost and high accuracy.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the rotation speed detection sensor rotor of the first example is externally fixed to a rolling bearing unit to form a rotation speed detection rolling bearing unit.

FIG. 3 is a cross-sectional view showing a state in which a rolling bearing unit for rotation speed detection is similarly fixed inside and configured.

FIG. 4 is a partial sectional view showing a second example of the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state in which a rotation speed detection rolling bearing unit is formed by internally fitting and fixing the rotation speed detecting sensor rotor of the second example to a rolling bearing unit.

FIG. 6 is a cross-sectional view showing a state in which a rolling bearing unit for rotational speed detection is similarly fixed by external fitting.

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

FIG. 8 is a cross-sectional view showing a state in which the rotation speed detection sensor rotor according to the third example is externally fixed to a rolling bearing unit to form a rotation speed detection rolling bearing unit.

FIG. 9 is a partial sectional view showing a fourth example of the embodiment of the present invention.

FIG. 10 is a partial sectional view showing the fifth example.

FIG. 11 is a partial sectional view showing the sixth example.

FIG. 12 is a partial sectional view showing the seventh example.

FIG. 13 is a partial cross-sectional view showing the eighth example.

FIG. 14 is a partial sectional view showing the ninth example.

FIG. 15 is a cross-sectional view illustrating a state in which a rotation speed detection rolling bearing unit is configured by externally fixing the rotation speed detecting sensor rotor of the ninth example to a rolling bearing unit.

FIG. 16 is a partial sectional view showing a tenth example of the embodiment of the present invention.

FIG. 17 is a partial sectional view showing the eleventh example.

FIG. 18 is a partial cross-sectional view showing the twelfth example.

FIG. 19 is a partial sectional view showing a first example of a conventional structure.

FIG. 20 is a partial cross-sectional view showing the second example.

FIG. 21 is a partial cross-sectional view showing the third example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hub 2 Flange 3 Outer raceway 4 Inner raceway 5 Inner raceway 6 Rolling element 7a, 7b, 7c Sensor rotor 8 Cylindrical part 9, 9a Circle part 10 Through hole 11 First element 12 Second element 13 Internal space 14a, 14b, 14c , 14d, 17e, 14f, 1
4g, 14h, 14i, 14j, 14k, 14m Sensor rotor 15 First cylindrical portion 16 Second cylindrical portion 17, 17a Fixed cylindrical portion 18, 18a Folded portion 19 Depressed groove 20 Outer ring 21 Material 22 Encoder

Claims (2)

[Claims] 1. A rotational speed of the rotating member is detected by press-molding a metal plate, fitted and fixed to a peripheral surface of the rotating member, and combined with a sensor supported by a stationary member. A rotation speed detection device for detecting, a rotation speed detection sensor rotor having a portion to be detected, a circular portion, and one of the inner and outer peripheral edges of the circular portion on the peripheral surface of the rotating member A first cylindrical portion formed on the opposing peripheral edge, which can be fitted and fixed to the peripheral surface, and a second cylindrical portion formed on the other peripheral edge of the rotating member at the other of the inner and outer peripheral edges of the annular portion. A rotational speed detecting sensor rotor comprising a cylindrical portion, wherein the detected characteristics of the circular ring portion are alternately changed at equal intervals in a circumferential direction to serve as the detected portion. 2. A rotational speed of the rotating member is detected by press-molding a metal plate, fitted and fixed to a peripheral surface of the rotating member, and combined with a sensor supported by a stationary member. A rotation speed detection device for detecting, a rotation speed detection sensor rotor having a portion to be detected, a circular portion, and one of the inner and outer peripheral edges of the circular portion on the peripheral surface of the rotating member A fixed cylindrical portion formed on an opposing peripheral edge and capable of being fitted and fixed to the peripheral surface; and the circular ring portion is formed by folding a part of the metal plate by 180 degrees at a portion opposite to the fixed cylindrical portion. In addition, the folded portion has a thickness equivalent to that of the two metal plates by overlapping both sides of the folded portion, and the detected characteristics of the annular portion are alternately arranged in the circumferential direction. And at equal intervals, with the detected part Rotation speed detection sensor rotor.