JPH0749353A - Rotor for rotating speed sensor - Google Patents

Abstract

PURPOSE:To provide a rotor for rotation speed sensor capable of restraining noises generated by an axis dislocation due to eccentricity and relaxation of the rotor, etc. CONSTITUTION:A rotor main body 2 is nearly cylindrically formed of resin. Pieces 3 of metal formed in square shapes are arranged at regular intervals and buried, along the peripheral surface of the rotor main body 2. The surfaces of the pieces 3 of metal and the peripheral surface of the rotor main body 2 are disposed so that they may be flush with each other without differences in level. Therefore, the role of an uneven part contributed to detection in a conventional rotor made of metal can be played by the pieces 3 of metal and portions of resin, of the rotor main body 2, located between pieces 3 of metal. Thus, the rotor 1 can be lightened without reducing the sensibility of detection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a rotational speed sensor used in a rotational speed sensor mounted on a wheel of an automobile, a transmission or the like to detect the rotational speed of a wheel shaft or a drive shaft.

[0002]

2. Description of the Related Art In recent years, automobiles have been equipped with an anti-lock brake system, an automatic transmission, a navigation system, etc., and these devices detect the traveling speed of the automobile and perform various controls. Driving speed detection is becoming more important. Further, in order to reduce the weight of the car body and reduce the cost, a part of the body and interior members are made of resin.

By the way, in order to detect the traveling speed of an automobile as described above, heat resistance, environment resistance, etc. are taken into consideration.
Generally, a magnetic detection device is used rather than an optical or contact detection device. For example, a rotor that is fixed to a rotating shaft (axle) that is inserted substantially in the center and rotates integrally with this rotating shaft is installed in a magnetic field, and the rotation speed of the rotating shaft (that is, traveling speed) is changed by the change of the magnetic field due to the rotation of the rotor. The rotation speed sensor etc. which detect) are used.

As the rotor for the rotational speed sensor as described above, as described in Japanese Utility Model Publication No. 4-8370, a permanent magnet is insert-molded at one end of a resin rotor formed in an oval shape. However, this has a problem that since a relatively heavy permanent magnet is integrally fixed to the rotor, the fixing portion of the resin rotor with respect to the rotary shaft is loosened and is cheap.

On the other hand, as shown in FIG. 30, there is a rotor 19 made of a substantially cylindrical metal having a concavo-convex portion 20 formed by carving or the like on the surface along the circumferential direction so as to have a gear shape. . The rotor 19 is fixed to the rotating shaft, and a detecting portion in which a permanent magnet is arranged is provided in the vicinity thereof, and when the rotor 19 makes a rotational movement in a magnetic field generated by the permanent magnet, the detecting portion is provided on the surface of the rotor 19 along the circumferential direction. A so-called magnet pickup method (hereinafter abbreviated as MPU method) in which the magnetic field is changed by the uneven portion 20 and is extracted as a signal by an induced electromotive force generated in the magnetic detection coil of the detection unit to detect the rotation speed of the rotating shaft. There is a rotation speed sensor called. In addition, the above-mentioned change of the magnetic field is applied to the rotor 1 made of metal.
That is detected by a Hall element disposed between the magnet 9 and the permanent magnet (hereinafter referred to as the Hall element method), or
A high-frequency magnetic field is generated by passing a high-frequency current through the coil, and the metal rotor 19 is arranged in the high-frequency magnetic field, and the eddy current generated on the surface of the rotor 19 by the high-frequency magnetic field changes due to the rotation of the rotor 19, and A rotation speed sensor or the like that detects a change in the Q factor of the coil that occurs is used. That is, as the rotor, a gear-shaped rotor which is made of metal and has unevenness in the circumferential direction of the surface is widely used.

[0006]

The metal rotor 19 described above is robust and has excellent environmental resistance, but it has a problem that it is heavy and costly, and machining of the uneven portion 20 is troublesome. is there. Further, the entire rotor 19 is formed of a single metal, and in the method of detecting the change in the magnetic field caused by the uneven portion 20 provided on the surface of the rotor 19 as described above, the unevenness is obtained in order to obtain sufficient detection sensitivity. There is a problem that the size of the portion 20 must be increased to some extent. Further, there is a problem that the rotation of the rotor 19 is shaken due to the eccentricity of the rotor 19 or the rotation speed is difficult to detect due to noise generated by external vibration.

Here, in the so-called high frequency induction type rotation speed sensor shown in FIG. 31, the metal rotor 1 is used.
9, a pair of sensor portions 21 are arranged, and a high-frequency current is supplied from the oscillator 22 to each of these sensor portions 21. A coil (not shown) is provided in the sensor portion 21 through which the high frequency current flows, and an eddy current flows on the surface of the rotor 19 by the high frequency magnetic field generated from this coil. On the other hand, the rotor 19 is rotating together with a rotating shaft (not shown), and the distance between the sensor unit 21 and the rotor 19 is equal to the uneven portion 20.
It changes with. Therefore, the strength / direction of the eddy current flowing on the surface of the rotor 19 changes, and the magnetic field generated by the eddy current affects and changes the high-frequency magnetic field generated by the coil of the sensor unit 21. The electromotive force induced in the sensor unit 21 due to the change is detected by the detector 23 connected to each sensor unit 21, and the detected signal voltage is amplified by the differential amplifier 24 and sent to the comparator 25. In this comparator 25, the reference voltage V _ref
And the output voltage of the differential amplifier 24 are compared to obtain the sensor output.

In the above high-frequency induction type rotation speed sensor, the change in the eddy current is affected not only by the uneven portion 20 of the rotor 19 but also by the entire rotor 19 formed of metal, as shown in FIG. , The output voltage V of the differential amplifier 24
or cause undulations _s, cause a drift as shown in Figure 33, as a result, the peak value (peak-to-peak value) of the output voltage is greater than the reference voltage V _ref of ± not out sensor output can not be detected The problem arises.

An object of the present invention is to solve the above problems, and an object of the present invention is to provide a rotor for a rotation speed sensor, which can suppress noise caused by shaft misalignment due to eccentricity and looseness of the rotor.

[0010]

In order to achieve the above-mentioned object, a rotor fixed to a rotary shaft inserted substantially in the center and rotating integrally with the rotary shaft is installed in a magnetic field. In the rotor for the rotation speed sensor that detects the rotation speed of the rotating shaft by the change of the magnetic field due to the rotation of the rotor, a metal part that causes the change of the magnetic field is formed along the circumferential direction on the rotor body formed of resin in a substantially cylindrical shape. It is characterized in that they are provided side by side at equal intervals.

[0011]

According to the first aspect of the present invention, the rotor fixed to the rotary shaft inserted substantially in the center and rotating integrally with the rotary shaft is installed in the magnetic field, and the rotary shaft is changed by the change of the magnetic field due to the rotation of the rotor. In the rotor for the rotation speed sensor that detects the rotation speed of, the metal parts that cause the change of the magnetic field are provided in the rotor body, which is formed of resin in a substantially cylindrical shape, at equal intervals along the circumferential direction. Since the resin forming the rotor body is located between the arranged metal parts, the weight of the rotor can be reduced without lowering the detection sensitivity, and the weight reduction of the rotor causes vibration due to eccentricity of the rotor. Noise can be reduced by suppressing the deviation between the rotor and the rotation axis.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. By the way, as described above, the sensor unit for detecting the rotation speed of the rotor needs a permanent magnet, a coil, a core, or the like according to each method. Is detected and the magnetic flux change is detected in the Hall element type, it is sufficient if the irregularities involved in the detection are made of metal. further,
In the high frequency induction type, at least the surface of the rotor through which the eddy current flows is made of metal, and the rotor made of metal may be sufficiently thin, and its moment of inertia is sufficiently smaller than that when a permanent magnet is fixed to the rotor.

Therefore, in the present invention, only the portion of the entire rotor that changes the magnetic field for speed detection is made of metal, and the other portion is made of resin. As a result, the role of the concavo-convex portion that has contributed to detection in the conventional metal rotor is played by the metal portion and the resin portion located between the metal portions, so that the rotor can be operated without lowering the detection sensitivity. It is lightweight.

By thus reducing the weight of the rotor, it is possible to suppress the occurrence of vibration due to the eccentricity of the rotor and the deviation between the rotor and the rotating shaft, and it is possible to reduce noise during detection. (Embodiment 1) Hereinafter, an embodiment of the high-frequency induction type rotation speed sensor will be specifically described. First, a first embodiment of the present invention will be described with reference to FIGS. Note that the configuration and operation of the high-frequency induction type rotation speed sensor are the same as those of the conventional one, and thus the description thereof will be omitted.

In this embodiment, as shown in FIG. 1, a metal piece 3 having a rectangular shape is formed on the outer peripheral surface of a rotor body 2 made of resin in a substantially cylindrical shape along the circumferential direction thereof. They are arranged at intervals and are embedded so that the surface of the metal piece 3 and the outer peripheral surface of the rotor body 2 are flush with each other without a step. as a result,
The metal piece 3 and the resin portion of the rotor body 2 located between the metal pieces 3 play the role of the uneven portion that has contributed to the detection in the conventional metal rotor, and the detection sensitivity is lowered. It is possible to reduce the weight of the rotor 1 without using it.

Alternatively, as shown in FIG. 2, a part of the metal piece 3 may be projected from the outer peripheral surface of the rotor body 2, and as shown in FIG. 3, it is formed in a substantially L shape. The metal piece 4 may be provided with a claw 4a, and the claw 4a may be locked in a locking hole 2a provided in the rotor body 2. (Embodiment 2) In this embodiment, as shown in FIG.
The metal piece 3 is embedded in the rotor body 2 without being exposed at all.

In the above construction, since the metal piece 3 is not exposed to the outside at all, the metal piece 3 does not rust, the environment resistance is improved, and there is no fear of chipping. (Embodiment 3) In this embodiment, as shown in FIG. 5, thin metal plates 5 are arranged at equal intervals in the circumferential direction of the rotor main body 2 and insert-molded on the rotor main body 2 to form the metal plate 5.
The end face of is exposed.

(Embodiment 4) In this embodiment, as shown in FIGS. 6 and 7, the metal balls 6 are embedded in the outer peripheral surface of the rotor body 2 at equal intervals so as to expose a part thereof. is there. The surface in which the metal balls 6 are embedded may be any surface as long as it is a surface along the circumferential direction of the rotor body 2.

(Embodiment 5) In this embodiment, as shown in FIG. 8, metal portions 7 formed in a substantially conical shape are erected on the rotor body 2 with the apices of the cones facing outward at equal intervals. Is. In the first to fifth embodiments, the metal piece 3, the metal plate 5, the metal sphere 6, and the substantially conical metal portion 7 are not limited to those formed entirely of metal, but carbon and metal powder may be used. It may be formed of a resin containing. Further, the type of metal may be either iron-based or non-ferrous, and they may be combined and arranged alternately. For example, an iron-based metal and a non-ferrous metal may be arranged alternately, or an iron-based metal and a non-ferrous metal may be arranged alternately between resins.

(Embodiment 6) In this embodiment, as shown in FIGS. 9 to 11, the rotor main body 8 is formed of a resin that cannot be metal-plated (hereinafter referred to as non-platable resin), and metal plating is performed. A resin that can be plated (hereinafter referred to as a plateable resin) is arranged at equal intervals to form a square, plate, or spherical shape on the rotor body 8, and the portion of the plateable resin is metal-plated to form the metal portion 9. Is forming.

In the above structure, since the metal portion 9 is formed by plating the resin with metal, the weight of the rotor 1 can be further reduced. (Embodiment 7) In this embodiment, a skeleton is formed of metal, carbon, resin containing metal powder, or the like, and this skeleton is insert-molded into the rotor body 2 made of resin. Various shapes are conceivable for this frame.

For example, as shown in FIG. 12, the above metal or the like is formed into a substantially rectangular thin plate shape, and is cut out into a substantially rectangular shape at equal intervals along the longitudinal direction to form a ladder shape, which is rolled into a tubular shape. The skeleton 10 is formed. Then, as shown in FIG. 13, the frame 10 is insert-molded into the rotor body 2 made of resin. At this time, as shown in FIG.
Surface may be exposed, or as shown in FIG. 14, it may be embedded inside the resin so as not to be exposed. In the case of embedding inside the resin as shown in FIG. 14, the inside of the frame 10 may be formed of a resin that does not easily loosen, and the resin outside the frame 10 may be a different type of resin.

Alternatively, as shown in FIG. 15, an assembly is provided in which grooves 11a are arranged at equal intervals inward from the peripheral edge of the main body 11 of the frame formed in a tubular shape, and the upper and lower portions are formed in a plate shape having different widths. The wide upper part of the piece 12 is inserted into the groove 11a to form the frame 13. Then, as shown in FIG. 16, the frame 13 is insert-molded on the resin rotor main body 2 so that the end portions of the assembly piece 13 are exposed.

Further, as shown in FIG. 17, a pair of circular plates or polygonal plate-shaped side plates 14 are attached to both ends of columnar or prismatic columns 15 arranged at equal intervals to form a frame 16. As shown in FIG. 18, resin is insert-molded between the side plates 14 to form the rotor 1. (Embodiment 8) In this embodiment, a metal seal 17 is applied to the surface of the rotor body 2 made of resin, or a paint containing a metal component is applied to the surface of the rotor 1 to form a metal portion 17 on the rotor 1. Is formed.

For example, when applying a coating material containing a metal component, various application shapes can be considered as shown in FIGS. 19 to 21. That is, it is applied in a square shape as shown in FIG. 19, is applied in a line shape as shown in FIG. 20, or, as shown in FIG. 21, is a hemispherical protrusion 18 on the surface of the rotor body 2. May be provided and applied to it. Regarding application, holes or recesses of the various shapes described above may be provided on the surface of the rotor body 2 made of resin, and the paint may be poured into the holes or recesses.
Further, at least a part of the entire surface of the rotor body 2 may be covered with a metal, a photoresist may be attached to the surface of the metal, and an etching process may be performed to expose the metal in a desired shape. .

(Embodiment 9) In this embodiment, the resin-made quadrangular convex portions 25 are arranged at equal intervals on the outer peripheral surface of the resin rotor body 2 as shown in FIG. 22 or as shown in FIG. Is provided along the circumferential direction on the side surface of the rotor main body 2 and the surface of the rectangular convex portion 25 is metal-plated, or is covered with a thin metal such as aluminum thin, or the convex portion 25 and The rotor 1 is formed by forming a laminated structure with a thin metal plate.

(Embodiment 10) In this embodiment, as shown in FIG. 24, holes 26 opening in a substantially quadrangular shape are provided on the outer peripheral surface of a resin rotor body 2 at equal intervals, and the openings of the holes 26 are formed. Is covered with a thin metal, the hole 26 is filled with a metal to scrape the surface, or the inner wall of the hole 26 is covered with a metal plating or a thin metal to form the rotor 1.

(Embodiment 11) In this embodiment, as shown in FIGS. 25 and 26, substantially rectangular recesses 27 are provided at equal intervals on the outer peripheral surface of a rotor body 2 made of resin, and the above-mentioned rectangular shape is formed. The rotor 1 is formed by metal-plating the recess 27, by covering with a thin metal such as aluminum, or by forming the recess 27 and a thin metal plate into a laminated structure. Further, the recess 27 may have one side of the quadrangular shape that is open on the side surface side of the rotor body 2 as shown in FIG. 25, or may not be open as shown in FIG.

The recess 27 may be formed only without covering the recess 27 with metal by a method such as metal plating. (Embodiment 12) In this embodiment, as shown in FIG. 27, a groove-shaped uneven portion 28 is provided on the outer peripheral surface of a resin rotor body 2 to form a gear shape, and the uneven portion 28 is metal-plated. Or
The rotor 1 is formed by depositing and covering a thin metal such as aluminum or by forming the uneven portion 28 and a thin metal plate into a laminated structure.

It should be noted that the concavo-convex portion 28 may be formed without covering the concavo-convex portion 28 with a metal by a method such as metal plating. When the rotor 1 of the above-described first to twelfth embodiments is used for the high-frequency induction type rotation speed sensor described in the conventional example, since the rotor body 2 is made of resin, the rotor 1 is misaligned. 28, no waviness is generated in the output voltage of the differential amplifier 24 as shown in FIG. 28, or even if the rotor 1 is eccentric, no drift is generated as shown in FIG. The high value (peak-to-peak value) exceeds the reference voltage V _{ref of} ± and the sensor output stabilizes.

The rotation speed sensor which can use the rotor of the present invention is not limited to the one described above, but a method of oscillating the coil and detecting magnetic saturation by the metal part of the rotor, or an oscillating drive of the coil and the metal of the rotor. A method of detecting oscillation and oscillation stop by a unit may be used, and the invention can be applied to not only a rotation speed sensor but also a rotary encoder.

[0032]

According to the first aspect of the present invention, the rotor body for the rotation speed sensor is formed of resin into a substantially cylindrical shape, and the metal portions for changing the magnetic field are arranged at equal intervals along the circumferential direction of the rotor body. Since the resin that forms the rotor body is located between the metal parts that are arranged at equal intervals, the weight of the rotor can be reduced without lowering the detection sensitivity, and the weight of the rotor can be reduced. There is an effect that noise can be reduced by suppressing the generation of vibration due to the eccentricity of the rotor and the deviation between the rotor and the rotating shaft. Further, there is an effect that the cost can be reduced because it can be formed corresponding to various dimensions without requiring a precise cutting process unlike the conventional metal rotor.

[Brief description of drawings]

FIG. 1 shows Example 1, in which (a) is a plan view,
(B) is a side view.

2A and 2B show another configuration of the above, wherein FIG. 2A is a plan view and FIG. 2B is a side view.

FIG. 3 is a main part plan view showing still another configuration of the same.

FIG. 4 shows Example 2 in which (a) is a plan view,
(B) is a side view.

FIG. 5 shows Example 3 in which (a) is a plan view,
(B) is a side view.

6A and 6B show Example 4 in which (a) is a plan view,
(B) is a side view.

7A and 7B show another configuration of the above, wherein FIG. 7A is a plan view and FIG. 7B is a side view.

8A and 8B show Example 5, in which FIG. 8A is a plan view,
(B) is a side view.

9A and 9B show Example 6 in which (a) is a plan view,
(B) is a side view.

FIG. 10 shows another configuration of the above, in which (a) is a plan view and (b) is a side view.

FIG. 11 shows another configuration of the above,
(A) is a plan view and (b) is a side view.

FIG. 12 is a plan view of a frame according to a seventh embodiment.

FIG. 13 is a view showing the entire rotor of the above, (a)
Is a plan view and (b) is a side view.

14A and 14B show another configuration of the above, in which FIG. 14A is a plan view and FIG. 14B is a side view.

FIG. 15 is a plan view of another skeleton of the above.

FIG. 16 shows another entire rotor of the above,
(A) is a plan view and (b) is a side view.

FIG. 17 is a plan view of still another skeleton of the above.

[Fig. 18] Fig. 18 shows still another whole rotor of the above, in which (a) is a plan view and (b) is a side view.

19A and 19B show Example 8 in which FIG. 19A is a plan view and FIG. 19B is a side view.

FIG. 20 shows another configuration of the above, in which (a) is a plan view and (b) is a side view.

FIG. 21 is a view showing still another configuration of the above,
(A) is a plan view and (b) is a side view.

22A and 22B show Example 9; (a) is a plan view and (b) is a side view.

FIG. 23 shows another configuration of the above, in which (a) is a plan view and (b) is a side view.

24A and 24B show Example 10 in which (a) is a plan view and (b) is a side view.

25A and 25B show Example 11; FIG. 25A is a plan view and FIG. 25B is a side view.

FIG. 26 shows another configuration of the above, in which (a) is a plan view and (b) is a side view.

27A and 27B show Example 12 in which (a) is a plan view and (b) is a side view.

FIG. 28 is a diagram showing an output signal waveform when the rotor of the rotation speed sensor using the rotors of Examples 1 to 12 is eccentrically vibrated, (a) is an output signal waveform diagram of the differential amplifier, b) is a sensor output signal waveform diagram.

FIG. 29 is a diagram showing an output signal waveform when the rotor of the rotation speed sensor using the rotors of the first to twelfth examples is misaligned, and FIG. 29 (a) is an output signal waveform diagram of the differential amplifier; b) is a sensor output signal waveform diagram.

FIG. 30 shows a conventional example, (a) is a plan view,
(B) is a side view.

FIG. 31 is a schematic configuration diagram showing a high-frequency induction type rotation speed sensor.

32A and 32B are diagrams showing an output signal waveform when the rotor of the rotation speed sensor using the conventional rotor eccentrically vibrates, where FIG. 32A is an output signal waveform diagram of the differential amplifier, and FIG. It is a signal waveform diagram.

FIG. 33 is a diagram showing an output signal waveform when the rotor of the rotation speed sensor using the conventional rotor is misaligned, (a) is an output signal waveform diagram of the differential amplifier, and (b) is a sensor output. It is a signal waveform diagram.

[Explanation of symbols]

 1 rotor 2 rotor body 3 metal piece

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[Procedure amendment]

[Submission date] May 9, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art In recent years, automobiles have been equipped with an anti-lock brake system, an automatic transmission, a navigation system, etc., and these devices detect the traveling speed of the automobile and perform various controls. Driving speed detection is becoming more important. On the other hand, in order to reduce the weight and cost of automobile bodies, a part of the body and interior members are made of resin.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

By the way, in order to detect the traveling speed of an automobile as described above, in consideration of heat resistance, environment resistance , durability and the like, generally, a magnetic field is more preferable than an optical or contact type detection device. Detection device is used. For example, a rotor that is fixed to a rotating shaft (axle) that is inserted substantially in the center and rotates integrally with this rotating shaft is installed in a magnetic field, and the rotation speed of the rotating shaft (that is, traveling speed) is changed by the change of the magnetic field due to the rotation of the rotor. The rotation speed sensor etc. which detect) are used.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

On the other hand, as shown in FIG. 34, there is a rotor 19 made of a substantially cylindrical metal having a concavo-convex portion 20 formed by cutting or the like on the surface along the circumferential direction to form a gear shape. . The rotor 19 is fixed to the rotating shaft, and a detecting portion in which a permanent magnet is arranged is provided in the vicinity thereof, and when the rotor 19 makes a rotational movement in a magnetic field generated by the permanent magnet, the detecting portion is provided on the surface of the rotor 19 along the circumferential direction. the uneven portion 20 by varying the above magnetic field, detecting the rotational speed of the rotating shaft is taken out as a signal by the induced electromotive force generated in the magnetic detection coil of the detecting portion, a so-called magnet pickup method (hereinafter abbreviated as MPU mode) and There is a rotation speed sensor called. In addition, the above-mentioned change of the magnetic field is reflected by the metal rotor 19
Which is detected by a Hall element disposed between the magnet and the permanent magnet (hereinafter referred to as Hall element method), or a high-frequency magnetic field is generated by passing a high-frequency current through a coil, and the high-frequency magnetic field is generated by the metal A rotor speed sensor or the like is used in which the rotor 19 is arranged, and an eddy current generated on the surface of the rotor 19 by a high-frequency magnetic field changes due to the rotation of the rotor 19, and a change in the Q factor of the coil caused thereby is detected. That is, as the rotor, a gear-shaped rotor which is made of metal and has unevenness in the circumferential direction of the surface is widely used.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

In the so-called high frequency induction type rotation speed sensor shown in FIG. 35 , the metal rotor 1 is used.
9, a pair of sensor portions 21 are arranged, and a high-frequency current is supplied from the oscillator 22 to each of these sensor portions 21. A coil (not shown) is provided in the sensor portion 21 through which the high frequency current flows, and an eddy current flows on the surface of the rotor 19 by the high frequency magnetic field generated from this coil. On the other hand, the rotor 19 is rotating together with a rotating shaft (not shown), and the distance between the sensor unit 21 and the rotor 19 is equal to the uneven portion 20.
It changes with. Therefore, the strength / direction of the eddy current flowing on the surface of the rotor 19 changes, and the magnetic field generated by the eddy current affects and changes the high-frequency magnetic field generated by the coil of the sensor unit 21. The electromotive force induced in the sensor unit 21 due to the change is detected by the detector 23 connected to each sensor unit 21, and the detected signal voltage is amplified by the differential amplifier 24 and sent to the comparator 25. In this comparator 25, the reference voltage V _ref
And the output voltage of the differential amplifier 24 are compared to obtain the sensor output.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

In the above high-frequency induction type rotation speed sensor, the change of the eddy current is influenced not only by the uneven portion 20 of the rotor 19 but also by the entire rotor 19 formed of metal, so that the rotor 19 is eccentric. In this case, as shown in FIG. 36, when the output voltage V _s of the differential amplifier 24 has a swell or the rotor 19 has an axis deviation , a drift occurs as shown in FIG. 37, and as a result, the output voltage Although the peak value (peak-to-peak value) exceeds the reference voltage V _{ref of} ±, the sensor output is not output and the detection cannot be performed.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and to prevent eccentricity of the rotor and axial displacement of the rotor due to mounting accuracy and looseness.
An object of the present invention is to provide a rotor for a rotation speed sensor that can suppress noise caused by the above.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

[0011]

According to the first aspect of the present invention, the rotor fixed to the rotary shaft inserted substantially in the center and rotating integrally with the rotary shaft is installed in the magnetic field, and the rotary shaft is changed by the change of the magnetic field due to the rotation of the rotor. In the rotor for the rotation speed sensor that detects the rotation speed of, the metal parts that cause the change of the magnetic field are provided in the rotor body, which is formed of resin in a substantially cylindrical shape, at equal intervals along the circumferential direction. Since the resin that forms the rotor body is located between the aligned metal parts, the high-frequency magnetic field method is used.
In the rotational speed sensor of, the rotor can be made lighter without lowering the detection sensitivity, and by making the rotor lighter, the generation of vibration due to the eccentricity of the rotor and the deviation between the rotor and the rotating shaft can be suppressed , Eccentricity and misalignment
In this case, the noise due to the influence of the entire metal rotor can be reduced.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014] In this way, by the weight of the rotor, it is possible to suppress the deviation between the occurrence and the rotor of the vibration due to the eccentricity of the rotor and the rotary shaft, a metal rotor all
It is possible to reduce noise at the time of detection when there is an axis deviation or eccentricity from the body . (Embodiment 1) Hereinafter, an embodiment of the high-frequency induction type rotation speed sensor will be specifically described. First, a first embodiment of the present invention will be described with reference to FIGS. Note that the configuration and operation of the high-frequency induction type rotation speed sensor are the same as those of the conventional one, and thus the description thereof will be omitted.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

For example, as shown in FIG. 12, the above metal or the like is formed into a substantially rectangular thin plate shape, and is cut out at a regular interval along the longitudinal direction into a substantially rectangular shape to form a ladder shape, which is rolled into a tubular shape. The skeleton 10 can be formed and further shown in FIG.
To form a pipe-shaped metal material 10 'by extrusion molding
After this, as shown in FIG. 14 and FIG.
Unevenness is set on the outer peripheral surface of 0'by pressing or pressing.
The frame frames 10a and 10b are formed. And Fig. 16 and
As shown in FIG. 18 and FIG. 18, the frames 10 and 10a are made of resin.
Insert-molded on the rotor body 2 of FIG. At this time,
The surface of the skeleton 10 may be exposed as shown in FIG. 16 or may be embedded inside the resin so as not to be exposed as shown in FIGS. 17 and 18 . Note that FIG.
As shown in FIG. 7 and FIG. 18 , when embedded inside the resin, the inside of the skeletons 10 and 10a is made of a resin that does not easily loosen, and the resin outside the skeletons 10 and 10a is different from that of the resin. Good.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

Alternatively, as shown in FIG. 19 , an assembly is provided in which grooves 11a are arranged at equal intervals inward from the peripheral edge of the main body 11 of the frame formed in a tubular shape, and the upper and lower portions are formed in a plate shape having different widths. The wide upper part of the piece 12 is inserted into the groove 11a to form the frame 13. Then, as shown in FIG. 20 , the frame 13 is insert-molded into the resin rotor body 2 so that the end of the assembly piece 13 is exposed.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

Further, as shown in FIG. 21 , a pair of circular plates or polygonal plate-shaped side plates 14 are attached to both ends of columnar or prismatic columns 15 arranged at equal intervals to form a frame 16. As shown in FIG. 22 , resin is insert-molded between the side plates 14 to form the rotor 1. (Embodiment 8) In this embodiment, a metal seal 17 is applied to the surface of the rotor body 2 made of resin, or a paint containing a metal component is applied to the surface of the rotor 1 to form a metal portion 17 on the rotor 1. Is formed.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

For example, when applying a coating material containing a metal component, various application shapes can be considered as shown in FIGS. 23 to 25 . That is, it is applied in a square shape as shown in FIG. 23 , or as a line shape as shown in FIG. 24 , or as shown in FIG. 25 , a hemispherical projection 18 on the surface of the rotor body 2. May be provided and applied to it. Regarding application, holes or recesses of the various shapes described above may be provided on the surface of the rotor body 2 made of resin, and the paint may be poured into the holes or recesses.
Further, at least a part of the entire surface of the rotor body 2 may be covered with a metal, a photoresist may be attached to the surface of the metal, and an etching process may be performed to expose the metal in a desired shape. .

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

(Embodiment 9) In this embodiment, the resin-made quadrangular convex portions 25 are arranged at equal intervals and are shown on the outer peripheral surface of the resin rotor main body 2 as shown in FIG. 26 , or as shown in FIG. Is provided along the circumferential direction on the side surface of the rotor main body 2 and the surface of the rectangular convex portion 25 is metal-plated, or is covered with a thin metal such as aluminum thin, or the convex portion 25 and The rotor 1 is formed by forming a laminated structure with a thin metal plate.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

(Embodiment 10) In this embodiment, as shown in FIG. 28 , holes 26 opening in a substantially quadrangular shape are provided on the outer peripheral surface of a resin rotor body 2 at equal intervals, and the openings of the holes 26 are formed. Is covered with a thin metal, the hole 26 is filled with a metal to scrape the surface, or the inner wall of the hole 26 is covered with a metal plating or a thin metal to form the rotor 1.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

(Embodiment 11) This embodiment is shown in FIGS.
As shown in FIG. 30 , substantially rectangular recesses 27 are provided on the outer peripheral surface of the resin rotor main body 2 at equal intervals, and the rectangular recesses 27 are plated with metal or a thin metal such as aluminum is applied. The rotor 1 is formed by covering it or covering the concave portion 27 and the metal thin plate with a laminated structure. The recess 27 also has a square shape one side as shown in FIG. 29 be open to the side surface side of the rotor body 2, or, as shown in FIG. 30, may be or may not have an opening.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

The recess 27 may be formed only without covering the recess 27 with metal by a method such as metal plating. (Embodiment 12) In this embodiment, as shown in FIG. 31 , a groove-shaped uneven portion 28 is provided on the outer peripheral surface of a resin rotor body 2 to form a gear shape, and the uneven portion 28 is metal-plated. Or
The rotor 1 is formed by depositing and covering a thin metal such as aluminum or by forming the uneven portion 28 and a thin metal plate into a laminated structure.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

It is to be noted that, by only forming the uneven portion 28, this
Do not cover the uneven portion 28 with metal by a method such as metal plating.
May be. The rotor 1 according to the first to twelfth embodiments described above.
Is used for the high-frequency induction type rotation speed sensor described in the conventional example, since the rotor body 2 is made of resin,
Even if the rotor 1 is eccentric, the output voltage of the differential amplifier 24 does not swell as shown in FIG. 32 , or even if the rotor 1 is misaligned, as shown in FIG. As a result, the peak value (peak-to-peak value) of the output voltage exceeds the reference voltage V _{ref of} ± and the sensor output is stabilized.

[Procedure 18]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

[0032]

According to the first aspect of the present invention, the rotor body for the rotation speed sensor is formed of resin into a substantially cylindrical shape, and the metal portions for changing the magnetic field are arranged at equal intervals along the circumferential direction of the rotor body. since there is provided, between the metal parts arranged at regular intervals for the resin to form the rotor body is located, high-frequency magnetic field type
In the rotational speed sensor of, the rotor can be made lighter without lowering the detection sensitivity, and by making the rotor lighter, the generation of vibration due to the eccentricity of the rotor and the deviation between the rotor and the rotating shaft can be suppressed , Eccentricity and misalignment
In this case, it is possible to reduce the noise caused by the influence of the entire metal rotor . Further, there is an effect that the cost can be reduced because it can be formed corresponding to various dimensions without requiring a precise cutting process unlike the conventional metal rotor.

[Procedure Amendment 19]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 shows Example 1, in which (a) is a plan view,
(B) is a side view.

2A and 2B show another configuration of the above, wherein FIG. 2A is a plan view and FIG. 2B is a side view.

FIG. 3 is a main part plan view showing still another configuration of the same.

FIG. 4 shows Example 2 in which (a) is a plan view,
(B) is a side view.

FIG. 5 shows Example 3 in which (a) is a plan view,
(B) is a side view.

6A and 6B show Example 4 in which (a) is a plan view,
(B) is a side view.

7A and 7B show another configuration of the above, wherein FIG. 7A is a plan view and FIG. 7B is a side view.

8A and 8B show Example 5, in which FIG. 8A is a plan view,
(B) is a side view.

9A and 9B show Example 6 in which (a) is a plan view,
(B) is a side view.

FIG. 10 shows another configuration of the above, in which (a) is a plan view and (b) is a side view.

FIG. 11 shows another configuration of the above,
(A) is a plan view and (b) is a side view.

FIG. 12 is a plan view of a frame according to a seventh embodiment.

FIG. 13 is an explanatory diagram explaining the same as above.

FIG. 14 is a perspective view showing another skeleton of the above.

FIG. 15 is a perspective view showing still another skeleton of the above.

FIG. 16 is a view showing the entire rotor of the above, (a)
Is a plan view and (b) is a side view.

FIG. 17 shows another configuration of the above, in which (a) is
A plan view and (b) are side views.

FIG. 18 is a perspective view showing another entire rotor of the above.

FIG. 19 is a plan view of another skeleton of the above.

FIG. 20 is a view showing another whole rotor of the above,
(A) is a plan view and (b) is a side view.

FIG. 21 is a plan view of still another skeleton of the above.

FIG. 22 is a view showing still another whole rotor of the above .
(A) is a plan view and (b) is a side view.

FIG. 23 shows Example 8; (a) is a plane
FIG. 1B is a side view.

FIG. 24 shows another configuration of the above, in which (a) is
A plan view and (b) are side views.

FIG. 25 is a view showing still another configuration of the above,
(A) is a plan view and (b) is a side view.

FIG. 26 shows Example 9; (a) is a plane
FIG. 1B is a side view.

FIG. 27 shows another configuration of the above, in which (a) is
A plan view and (b) are side views.

FIG. 28 shows Example 10 (a) is a plane
FIG. 1B is a side view.

FIG. 29 shows Example 11 and (a) is a plane.
FIG. 1B is a side view.

FIG. 30 shows another configuration of the above, (a) of FIG.
A plan view and (b) are side views.

FIG. 31 shows Example 12 in which (a) is a plane.
FIG. 1B is a side view.

FIG. 32 uses the rotor of Examples 1 to 12
Output signal when the rotor of the rotation speed sensor vibrates eccentrically
It is a figure which shows a waveform, (a) is an output signal wave of a differential amplifier.
The figure and (b) are sensor output signal waveform diagrams.

FIG. 33 uses the rotor of Examples 1 to 12
Output signal wave when the rotor of the rotation speed sensor is misaligned
It is a figure which shows a shape, (a) is an output signal waveform of a differential amplifier.
FIG. 1B is a sensor output signal waveform diagram.

FIG. 34 shows a conventional example, (a) is a plan view,
(B) is a side view.

FIG. 35 is a schematic diagram showing a high-frequency induction type rotation speed sensor.
It is a diagram.

FIG. 36 shows a rotation speed sensor using a conventional rotor.
FIG. 6 is a diagram showing an output signal waveform when the rotor eccentrically vibrates.
(A) is the output signal waveform diagram of the differential amplifier, and (b) is the
It is a sensor output signal waveform diagram.

FIG. 37 shows a rotation speed sensor using a conventional rotor.
FIG. 4 is a diagram showing an output signal waveform when the rotor is misaligned.
(A) is the output signal waveform diagram of the differential amplifier, and (b) is the
It is a sensor output signal waveform diagram.

[Procedure amendment 20]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 13

[Correction method] Change

[Correction content]

[Fig. 13]

[Procedure correction 21]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 14

[Correction method] Change

[Correction content]

FIG. 14

[Procedure correction 22]

[Document name to be corrected] Drawing

[Correction target item name] Figure 15

[Correction method] Change

[Correction content]

FIG. 15

[Procedure amendment 23]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 16

[Correction method] Change

[Correction content]

FIG. 16

[Procedure correction 24]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 17

[Correction method] Change

[Correction content]

FIG. 17

[Procedure correction 25]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 18

[Correction method] Change

[Correction content]

FIG. 18

[Procedure Amendment 26]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 19

[Correction method] Change

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FIG. 19

[Procedure Amendment 27]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 20

[Correction method] Change

[Correction content]

FIG. 20

[Procedure correction 28]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 21

[Correction method] Change

[Correction content]

FIG. 21

[Procedure correction 29]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 22

[Correction method] Change

[Correction content]

FIG. 22

[Procedure amendment 30]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 23

[Correction method] Change

[Correction content]

FIG. 23

[Procedure correction 31]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 24

[Correction method] Change

[Correction content]

FIG. 24

[Procedure correction 32]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 25

[Correction method] Change

[Correction content]

FIG. 25

[Procedure amendment 33]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 26

[Correction method] Change

[Correction content]

FIG. 26

[Procedure amendment 34]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 27

[Correction method] Change

[Correction content]

FIG. 27

[Procedure amendment 35]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 28

[Correction method] Change

[Correction content]

FIG. 28

[Procedure correction 36]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 29

[Correction method] Change

[Correction content]

FIG. 29

[Procedure amendment 37]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 30

[Correction method] Change

[Correction content]

FIG. 30

[Procedure amendment 38]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 31

[Correction method] Change

[Correction content]

FIG. 31

[Procedure amendment 39]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 32

[Correction method] Change

[Correction content]

FIG. 32

[Procedure amendment 40]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 33

[Correction method] Change

[Correction content]

FIG. 33

[Procedure Amendment 41]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 34

[Correction method] Added

[Correction content]

FIG. 34

[Procedure amendment 42]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 35

[Correction method] Added

[Correction content]

FIG. 35

[Procedure amendment 43]

[Document name to be corrected] Drawing

[Correction target item name] Fig. 36

[Correction method] Added

[Correction content]

FIG. 36

[Procedure correction 44]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 37

[Correction method] Added

[Correction content]

FIG. 37

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Noriyuki Kaji, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works Ltd. (72) Fumihiro Kasano, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works, Ltd.

Claims (1)

[Claims] 1. A rotor fixed to a rotary shaft inserted substantially in the center and rotating integrally with the rotary shaft is installed in a magnetic field,
In a rotor for a rotation speed sensor that detects the rotation speed of a rotating shaft by changing the magnetic field due to the rotation of the rotor, a metal portion that causes a change in the magnetic field is formed along the circumferential direction on the rotor body formed of resin in a substantially cylindrical shape. A rotor for a rotation speed sensor, which is arranged side by side at intervals.