JP2003185471A - Rotation angle detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the dispersion of an output signal voltage E near an initial position of an accelerator position sensor being a rotation angle detector among products due to the positional deviation of a magnetic circuit 20 from a core 30 by devising the shape of the magnetic circuit 20. <P>SOLUTION: Yokes 21 of a magnetic circuit 20 face each other across a core 30 and have flat parts 21b parallel to the axial line V passing both magnets 23. If a positional deviation occurs between the magnetic circuit 20 and the core 30, this constitution keeps a point always fixed at the core 30 side in a minimum gap forming part between the circuit 20 and the core 30 and hence the direction of a flux M flowing in the core 30 always perpendicular to the flat part 21b. Thus the positional relation of the direction of the flux M flowing in the core 30 to a magnetic detection gap 32 of the core 30 can be held constant, thereby reducing the dispersion of output characteristics near an initial position of an accelerator position sensor 1 among products. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle detecting device for detecting a rotation angle between a rotating member and a non-rotating member.

[0002]

2. Description of the Related Art As a rotation angle detecting device, for example, there is an accelerator position sensor for detecting the amount of depression of an accelerator pedal of an automobile, that is, the rotation angle of a support shaft of the accelerator pedal.

A schematic structure of a conventional accelerator position sensor 100 is shown in FIG. 9, and its operation will be described with reference to FIG.

The accelerator position sensor 100 is provided on a support shaft (not shown) that is a rotating member that rotates according to the rotation of an accelerator pedal unit (not shown) as an object to be detected. Two magnets 23 are arranged so as to be opposed to each other across the rotation axis in a direction orthogonal to each other and in a direction substantially perpendicular to the direction in which the magnetic pole directions are opposed to each other.
A magnetic circuit 20 that is formed of two magnetic material yokes 21 that connect the same magnetic poles of two magnets 23 and that is formed in a substantially cylindrical shape that surrounds the rotating shaft, and that is arranged in the internal space of the magnetic circuit 20 and that has a magnetic circuit 20. The non-rotating member, which is the other one that changes its angle relative to the other, that is, a bracket (not shown) that rotatably holds the accelerator pedal unit, is provided in a direction orthogonal to the rotation axis of the support shaft. The core 3 is made of a magnetic material, and is divided into core pieces 31 which are two divided parts, and a Hall IC 33 which is a magnetic detection element is arranged in a gap 32 formed by the opposing core pieces 31.
0, and detects the rotation angle between the support shaft of the accelerator pedal unit and the bracket (that is, the accelerator pedal depression amount) based on the output signal of the Hall IC 33 that changes depending on the relative rotational position between the magnetic circuit 20 and the core 30. To do.

Here, FIG. 9 shows an accelerator position sensor 10.
0 indicates the initial position, that is, the driver does not depress the accelerator pedal. At this time, the positional relationship between the magnetic circuit 20 and the core 30 is set so that the output signal voltage of the accelerator position sensor 100 has a minimum value. That is, the magnetic flux M formed by both magnets 23 flows as shown by the arrow in FIG. 9, and the magnetic flux M that crosses the Hall IC 33 is not generated.
As a result, the output signal of the Hall IC 33 has a minimum value.

[0006]

By the way, in the accelerator position sensor 100, the magnetic circuit 20 and the core 30 are different between the products due to variations in completed dimensions of the accelerator pedal unit which is a rotating member and the bracket which is a non-rotating member. Of the relative position of, that is, a position shift occurs. For example, as shown in FIG.
10 and the core 30 are displaced, the position where the minimum gap between the magnetic circuit 20 and the core 30 is formed is the G portion in FIG. 10, and the magnetic flux M is at the initial position of the accelerator position sensor 100 in FIG. The current flows as shown by the arrow and crosses the Hall IC 33. Therefore, Hall IC3
The output signal of No. 3 changes from the minimum value in the state shown in FIG. 9 by a predetermined value, that is, a value corresponding to the magnetic flux density of the magnetic flux crossing the Hall IC 33. That is, in the accelerator position sensor 100, the output signal voltage near the initial position varies from product to product. Depending on the application of the accelerator position sensor 100, there is a problem that the above-mentioned variation in the output signal voltage near the initial position exceeds the allowable range.

The present invention has been made to solve such a problem, and its purpose is to devise the shape of the magnetic circuit so that the initial position caused by a change in the positional relationship between the magnetic circuit and the core. It is an object of the present invention to provide a rotation angle detection device that can reduce variations in output signal voltage between products in the vicinity.

[0008]

The present invention employs the following technical means in order to achieve the above object.

In the rotation angle detecting device according to the first aspect of the present invention, the yoke of the magnetic circuit is configured to have a substantially flat surface portion which is opposed to each other with the core in between and which is parallel to the axis connecting the both magnets. As a result, even if the magnetic circuit and the core are misaligned, the point on the core side in the minimum gap forming portion between the magnetic circuit and the core can always be the same point, so the direction of the magnetic flux flowing in the core is always The directions may be the same, that is, orthogonal to the plane portion of the yoke of the magnetic circuit. Therefore, even if the magnetic circuit and the core are misaligned, the positional relationship between the direction of the magnetic flux flowing in the core and the magnetic detection gap of the core can always be kept the same. It is possible to reduce the variation between products. In this case, as in the rotation angle detecting device according to claim 3, the axial length connecting both magnets of the plane portion provided on the yoke of the magnetic circuit is substantially equal to the diameter of the core, or
Or if the configuration is more than that, even if the magnetic circuit and the core are misaligned,
The points on the core side in the minimum gap forming portion between the cores can always be reliably made the same point.

In the rotation angle detecting device according to the second aspect of the present invention, what is sandwiched between the two yokes is a magnetic detecting element instead of the magnet, and is disposed in the gap of the core. Is a magnet instead of the magnetic detection element. Also in this case, the same effect as that of the first aspect can be obtained. That is, it is possible to reduce the product-to-product variation in the output characteristics near the initial position of the rotation angle detection device. In this case, as in the rotation angle detecting device according to claim 4, the axial length connecting both magnetic detecting elements of the flat surface portion provided on the yoke is substantially equal to or longer than the diameter of the core. With such a configuration, even when the yoke and the core are misaligned, the point on the core side in the minimum gap forming portion between the magnetic circuit and the core can always be reliably made the same point.

In the rotation angle detecting apparatus according to the fifth aspect of the present invention, the magnetic detecting element is arranged so as to detect the magnetic flux density flowing in the width direction of the core gap. Thus, the change in the rotation angle between the magnetic circuit and the core can be reliably detected by the magnetic detection element.

In the rotation angle detecting device according to the sixth aspect of the present invention, the magnetic detecting element is arranged so as to detect the magnetic flux density flowing in the width direction of the portion connected by the two yokes, that is, the gap of the yoke. It has been configured. Thus, the change in the rotation angle between the yoke and the core can be reliably detected by the magnetic detection element.

In the rotation angle detecting device according to the seventh aspect of the present invention, the yoke forming the magnetic circuit is fixed to the rotating member that rotates in response to the rotation of the object to be detected, and the core holding the magnetic detecting element is not. The structure is fixed to the rotating member. As a result, the magnetic detection element is fixed to the non-rotating member, so that the output signal from the magnetic detection element can be easily taken out.

In the rotation angle detecting device according to the eighth aspect of the present invention, the core holding the magnet is fixed to the rotating member that rotates according to the rotation of the object to be detected, and the yoke holding the magnetic detecting element is non-rotating. The structure is fixed to the member. As a result, the magnetic detection element is fixed to the non-rotating member, so that the output signal from the magnetic detection element can be easily taken out.

The rotation angle detecting device according to claim 9 of the present invention is applied to an accelerator position sensor of an automobile, and has a configuration in which a state in which the accelerator pedal is not depressed is an initial position. As a result, it can be easily applied to various automobiles.

In the rotation angle detecting device according to the tenth aspect of the present invention, the gap of the core is arranged so as to be orthogonal to the plane portion of the yoke in the axial direction at the initial position. Thereby, the magnetic detection direction of the magnetic detection element,
Since the direction of the magnetic flux flowing in the magnetic detection element is orthogonal, the magnetic flux flowing in the magnetic detection direction in the magnetic detection element is almost eliminated, and the output signal of the magnetic detection element at the initial position of the rotation angle detection device has a minimum value. Can be

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A rotation angle detecting device according to an embodiment of the present invention will be described below with reference to the drawings, taking as an example a case where the rotation angle detecting device is applied to a pedal position sensor incorporated in an accelerator pedal module for an automobile.

FIG. 1 is a sectional view of an accelerator position sensor 1 which is a rotation angle detecting device according to an embodiment of the present invention.
1. It is the II sectional view taken on the line of FIG. Further, FIG. 1 shows an initial position of the accelerator position sensor 1, that is, a state in which the accelerator pedal is not depressed.

FIG. 2 is a sectional view of the accelerator pedal module 10 in which the accelerator position sensor 1 is incorporated. In each figure, the same components are designated by the same reference numerals.

The accelerator pedal module 10 is mounted near the driver's seat in the passenger compartment of an automobile. When the driver depresses the accelerator pedal 11c with his / her foot or the like, the amount of depression is detected by the accelerator position sensor 1 as a rotation angle. Then, based on the detected output signal, the operating state of the engine is controlled by, for example, an engine control device (not shown) installed outside the accelerator pedal module 10.

First, a schematic structure of the accelerator pedal module 10 will be described.

The accelerator pedal module 10 comprises an accelerator pedal unit 11 as a rotating member, and a bracket 12 as a non-rotating member that holds the accelerator pedal unit 11 rotatably and is fixed to an automobile. . The accelerator pedal unit 11 includes a shaft portion 11a, which is a support shaft thereof, and a hole portion 12 of the bracket 12
It is rotatably fitted with a. That is, the accelerator pedal unit 11 can rotate around the rotation axis C. Further, an accelerator pedal 11c is integrally attached to the shaft portion 11a via an arm portion 11b. The accelerator pedal unit 11 is provided with a magnetic circuit 20 described later coaxially with the shaft portion 11a. On the other hand, a substantially cylindrical core 30 described later is fixed to the bracket 12 inside the magnetic circuit 20 and coaxially with the hole 12a.
The core 30 and the magnetic circuit 20 form an accelerator position sensor 1. Further, the accelerator pedal unit 11 includes a biasing member such as a coil spring (not shown).
Is always urged toward the initial position (engine unloaded state, so-called idling), and always stops at the initial position when the driver does not depress the accelerator pedal 11c.

Next, the structure of the accelerator position sensor 1 for detecting the rotation angle of the accelerator pedal unit 11 with respect to the bracket 12 will be described.

As shown in FIG. 1, the magnetic circuit 20 is opposed to the magnetic circuit 20 so as to sandwich the rotary shaft C in a direction orthogonal to the rotary shaft C of the shaft portion 11a of the accelerator pedal unit 11, and the magnetic poles thereof are also opposed to each other. It is composed of two magnets 23 arranged in a direction substantially perpendicular to the direction, that is, arranged in the left-right direction in FIG. 1 and arranged in substantially the same direction, and two yokes 21 made of a magnetic material that connect the same magnetic poles of both magnets 23. , Is formed in a substantially cylindrical shape so as to surround the rotation axis C. The shape of the magnetic circuit 20 is point-symmetric with respect to the rotation axis C. Both magnets 23 of the accelerator position sensor 1 according to one embodiment of the present invention
1 has an N pole on the left side and an S pole on the right side in FIG. Therefore, in the magnetic circuit 20, the left yoke 21 is N
It has the polarity of the pole, and the right yoke 21 has the polarity of the S pole.

Each yoke 21 is formed of a magnetic material such as iron into a shape as shown in FIG. Further, as shown in FIG. 1, each yoke 21 is formed with a flat surface portion 21b which is a substantially flat surface portion which is opposed to each other with the core 30 interposed therebetween and which is parallel to the axis V connecting the magnets 23. In addition, the flat portion 21
The length dimension L of b in the direction of the axis V is set longer than the diameter dimension D of the core 30.

After each yoke 21 and both magnets 23 are integrated by adhesion or the like to form the magnetic circuit 20, the magnetic circuit 20 is formed.
Is fixed to the accelerator pedal unit 11 coaxially with the rotation axis C thereof.

As shown in FIGS. 1 and 2, the core 30 is a non-rotating member which is arranged in the internal space of the magnetic circuit 20 and whose angle changes relative to the magnetic circuit 20, that is, an accelerator pedal unit 11. The bracket 12 is rotatably held. The core 30 made of a magnetic material is divided into two core pieces 31 which are two divided portions in a direction orthogonal to the rotation axis C of the shaft portion 11a, that is, in the vertical direction in FIG. Hall IC that is a magnetic detection element in the gap 32
33 are arranged and formed in a substantially cylindrical shape. here,
The Hall IC 33 is mounted in the magnetic detection gap 32 so that the magnetic flux density in the width direction (vertical direction in FIG. 1) of the magnetic detection gap 32 can be detected. That is, the width direction of the magnetic detection gap 32 (the vertical direction in FIG. 1) is the magnetic detection direction of the Hall IC 33.

The Hall IC 33 is an IC in which a Hall element which is a magnetic detection element and a signal amplification circuit are integrated, and a voltage corresponding to the magnetic flux density passing through the Hall IC 33, that is, the magnetic flux density in the width direction of the magnetic detection gap 32. Output a signal.

Next, the operation of the accelerator position sensor 1 configured as described above will be described.

(1) When the accelerator pedal unit 11 is in the initial position.

When the accelerator pedal unit 11 is in the initial position (a state in which the accelerator pedal 11c is not depressed), the magnetic circuit 20 and the core 30 have a positional relationship as shown in FIG. The axis line H, which is the axial direction of the magnetic field, is set to be orthogonal to the plane portion 21 of the magnetic circuit 20. Therefore, the magnetic flux M is generated by the core 3
The magnetic detection gap 32 flows substantially parallel to the inside of 0. Therefore, the magnetic flux M that traverses the Hall IC 33 is hardly generated, and the output voltage of the Hall IC 33, that is, the output voltage of the accelerator position sensor 1 becomes the minimum value. That is, at the initial position of the accelerator pedal unit 11, the output voltage of the accelerator position sensor 1 has a minimum value.

(2) When the accelerator pedal unit 11 is being rotated.

FIG. 4 is a graph showing the relationship between the rotation angle θ of the accelerator pedal unit 11 and the output voltage E of the accelerator position sensor 1 according to the embodiment of the present invention. Figure 4
, The vertical axis is the output voltage E of the accelerator position sensor 1.
Is the rotation angle θ of the accelerator pedal unit 11.
(Depression amount) is shown. Further, in FIG. 4, the characteristic of the output voltage E of the conventional accelerator position sensor 100 is shown by a broken line.

When the driver depresses the accelerator pedal 11c to rotate the accelerator pedal unit 11 by the angle θ, the relative angle between the magnetic circuit 20 and the core 30 is also changed from the initial position to the angle θ as shown in FIG. Only changes. On the other hand, the magnetic flux M from both magnets 23 flowing in the core 30
Is always constant, that is, it is constant regardless of the rotation angle of the magnetic circuit 20. Therefore, as the magnetic circuit 20 rotates from the initial position of the accelerator pedal unit 11, the magnetic flux M crosses the Hall IC 33. Therefore, the output voltage of the Hall IC 33 has a value corresponding to the magnetic flux density across the Hall IC 33. When the accelerator pedal unit 11 rotates from the initial position, that is, θ = 0, the output voltage E has a minimum value (0..V in the accelerator position sensor 1 according to the embodiment of the present invention, as shown in FIG. 8V) and increases linearly.

By the way, the fitting portion between the accelerator pedal unit 11 and the bracket 12, that is, the shaft portion 11a and the hole portion 1
In the fitting portion of 2a, a gap necessary for maintaining the smooth rotation of the accelerator pedal unit 11 is formed. Further, the positional relationship between the shaft portion 11a of the accelerator pedal unit 11 and the magnetic circuit 20 and the positional relationship between the hole portion 12a of the bracket 12 and the core 30 vary within a predetermined range, that is, within the dimensional tolerance of each component. There is. Due to the above-mentioned gap and dimensional variation, the magnetic circuit 20 and the core 3
The positional relationship with 0 may vary within a predetermined range. In the accelerator position sensor 1 according to the embodiment of the present invention, since the magnetic circuit 20 is provided with the flat surface portion 21b, when the position of the core 30 changes with respect to the magnetic circuit 20, the flat surface portion 21b becomes Thus, the position of the cylindrical core 30 changes. FIG. 5 shows an example in which the position of the core 30 changes with respect to the magnetic circuit 20 at the initial position of the accelerator pedal unit 11. In FIG. 5, the core 30 is displaced from the rotation axis C of the magnetic circuit 20 by h in the upper part of FIG. In this case, the magnetic flux M flows in (or flows out) from the magnetic circuit 20 into the core 30, in other words, the flat portion 21b.
The points on the core 30 in the minimum gap forming portion between the core 30 and the core 30 are always the same point. Therefore, the magnetic flux M causes the core 30 to be substantially parallel to the magnetic detection gap 32, as in the case where there is no relative displacement between the magnetic circuit 20 and the core 30 shown in FIG.
That is, it flows as shown by the arrow in FIG.
Almost no magnetic flux that crosses is generated. Therefore, the output voltage E of the Hall IC 33 becomes the minimum value as in the case where there is no relative displacement between the magnetic circuit 20 and the core 30 as shown in FIG.

On the other hand, in the conventional accelerator position sensor 100, when the relative position shift between the magnetic circuit 20 and the core 30 occurs as shown in FIG. 10, the minimum gap forming portion between the magnetic circuit 20 and the core 30 is shown in FIG. Changes from the K part in FIG. 10 to the G part in FIG. Therefore, the magnetic flux M flows as indicated by an arrow in FIG. 10 and crosses the Hall IC 33. As a result, the output voltage E of the Hall IC 33 becomes a value corresponding to the magnetic flux density of the magnetic flux M crossing the Hall IC 33, not the minimum value. Therefore, in the conventional accelerator position sensor 100, the output voltage E varies as shown by the broken line in FIG. 4 at its initial position, that is, near the rotation angle θ = 0 of the accelerator pedal unit 11.

In the accelerator position sensor 1 according to the embodiment of the present invention described above, each yoke 21 of the magnetic circuit 20 is parallel to the axis V connecting the magnets 23 and the core 3 is provided.
A flat surface portion 21b is provided so as to face each other with 0 interposed therebetween. As a result, even if the magnetic circuit 20 and the core 30 are displaced, the point on the core 30 side in the minimum gap forming portion between the magnetic circuit 20 and the core 30 is always the same point, and the direction of the magnetic flux M flowing in the core is set. The directions can be always the same, that is, the direction orthogonal to the plane portion 21b of the magnetic circuit 20. Therefore, even if the magnetic circuit 20 and the core 30 are misaligned, the positional relationship between the direction of the magnetic flux M flowing in the core 30 and the magnetic detection gap 32 of the core 30 can always be kept the same.
It is possible to reduce product-to-product variations in output characteristics near the initial position of the accelerator position sensor 1.

Further, in the accelerator position sensor 1 according to one embodiment of the present invention, the yoke 21 is fixed to the accelerator pedal unit 11 which is a rotating member, and the core 30 is fixed to the bracket 12 which is a non-rotating member. This allows
The Hall IC 33 will be fixed to the non-rotating member,
The output signal from the Hall IC 33 can be easily taken out.

Further, in the accelerator position sensor 1 according to the embodiment of the present invention, a state in which the accelerator pedal 11c is not depressed is set as an initial position, and the axial direction of the magnetic detection gap 32 of the core 30 is set at this initial position. The axis H is arranged so as to be orthogonal to the plane portion 21b of the magnetic circuit 20. As a result, the axis H, which is the axial direction of the magnetic detection gap 32, and the direction of the magnetic flux M flowing in the core 30 are made parallel, and the magnetic flux M that crosses the Hall IC 33 arranged in the magnetic detection gap 32 is almost eliminated, and the accelerator Hall I at initial position of position sensor 1
The output signal of C33 can be minimized. Therefore, it is possible to easily perform signal processing in various control devices that use the output signal of the accelerator position sensor 1 for control, such as an engine control device.

In the accelerator position sensor 1 according to the embodiment of the present invention, the flat surface portion 21b provided on each yoke 21 of the magnetic circuit 20 may be substantially flat. That is, even when the magnetic circuit 20 and the core 30 are displaced from each other even when the surface is not a perfect flat surface due to variations in molding or the like, or a smooth curved surface having a large radius of curvature, the magnetic circuit 20 and the core 30 are misaligned. The points on the core 30 side in the minimum gap forming portion are always the same point, and the direction of the magnetic flux M flowing in the core is always the same, that is, the direction orthogonal to the plane portion 21b of the magnetic circuit 20. If it is a plane, the same effect as in the case of the accelerator position sensor 1 according to the above-described embodiment is obtained.

Further, in the accelerator position sensor 1 according to the embodiment of the present invention, at the initial position of the accelerator position sensor 1, the axis H, which is the axial direction of the magnetic detection gap 32 of the core 30, is the plane portion 21b of the magnetic circuit 20. It is arranged so that it is orthogonal to the axis H and the plane portion 2 of the magnetic circuit 20.
The angle formed with 1b may be an angle other than 90 degrees. Also in this case, it is possible to reduce the product-to-product variation in the output characteristics near the initial position of the accelerator position sensor 1.

Further, in the accelerator position sensor 1 according to one embodiment of the present invention, the Hall IC 33, which is an IC in which a Hall element which is a magnetic detection element and a signal amplification circuit are integrated, is provided in the magnetic detection gap 32 of the core 30. Although the Hall IC 33 is mounted, a Hall element may be mounted instead of the Hall IC 33, and a signal amplification circuit for the Hall element may be installed outside the core 30.

Further, in the accelerator position sensor 1 according to the embodiment of the present invention, the Hall element is used as the magnetic detecting element, but other elements such as a magnetic resistance element (MRE element) can be used as long as they are magnetically detectable elements. ) Or the like may be used.

Although the rotation angle detecting device according to the embodiment of the present invention is applied to the accelerator position sensor 1 as an example, it may be applied to a sensor other than the accelerator position sensor 1. Also in that case, as in the case of the accelerator position sensor 1 according to the above-described embodiment, the product of the output characteristic of the rotation angle detection device near the initial position of the rotating member due to the relative position variation between the rotating member and the non-rotating member. It is possible to reduce the variation between them.

The sensor other than the accelerator position sensor 1 may be applied to a sensor that detects only both ends of the rotation range of the rotating member, for example, a so-called fully closed switch that detects the fully closed state of the throttle valve.

FIG. 6 shows a sectional view of a modified example of the accelerator position sensor 1 according to the embodiment of the present invention. In this modification, the shape of the yoke 21 of the magnetic circuit 20 is changed. That is, as shown in FIG. 6, curved surface portions 21c are provided at both ends of the flat portion 21b. The radius of curvature of the curved surface portion 21c is set to be considerably larger than the radius of the core 30. As a result, the same effect as in the above-described embodiment can be obtained, and the outer shape of the magnetic circuit 20 can be downsized.

FIG. 7 shows a sectional view of another modified example of the accelerator position sensor 1 according to the embodiment of the present invention. In another modification, the shape of the yoke 21 of the magnetic circuit 20 is changed. That is, as shown in FIG.
Inversion parts 21d are provided at both ends of b. Inversion unit 21d
Are formed in a flat shape or a curved shape. Also in this case, the same effect as that of the above-described embodiment can be obtained.

FIG. 8 shows a sectional view of another modified example of the accelerator position sensor 1 according to the embodiment of the present invention. In this modification, the positional relationship between the magnet and the Hall IC that is the magnetic detection element is replaced with that of the accelerator position sensor 1 according to the embodiment of the present invention described above, that is, as shown in FIG. The magnetic detection gap 3 of the core 30
The magnet 23 is installed in 2 and two Hall ICs 33
Is sandwiched between both yokes 21. In this case also, in the case of the accelerator position sensor 1 according to the embodiment of the present invention, by providing each yoke 21 with a flat surface portion 21b that is parallel to the axis W connecting the Hall ICs 33 and faces each other with the core 30 in between. The same effect as can be obtained. Further, in this case, if the yoke 21 is fixed to the bracket 12 which is a non-rotating member and the core 30 is fixed to the accelerator pedal unit 11 which is a rotating member, the Hall IC 33 is provided.
Will be fixed to the non-rotating member, and Hall IC33
The output signal from can be easily taken out.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an accelerator position sensor 1 according to an embodiment of the present invention, which is a cross-sectional view taken along line I-I in FIG.

FIG. 2 is a sectional view of an accelerator pedal module 10 incorporating an accelerator position sensor 1 according to an embodiment of the present invention.

FIG. 3 is a sectional view of an accelerator position sensor 1 according to an embodiment of the present invention, showing a state in which an accelerator pedal unit 11 is rotated by an angle θ.

FIG. 4 is a rotation angle θ of an accelerator pedal unit 11 in an accelerator position sensor 1 according to an embodiment of the present invention.
5 is a graph showing the relationship between the output voltage E and the output voltage E.

FIG. 5 is a cross-sectional view of the accelerator position sensor 1 according to the embodiment of the present invention, showing an example in which the magnetic circuit 20 and the core 30 are displaced.

FIG. 6 is a cross-sectional view of a modified example of the accelerator position sensor 1 according to the embodiment of the present invention.

FIG. 7 is a sectional view of another modification of the accelerator position sensor 1 according to the embodiment of the present invention.

FIG. 8 is a sectional view of another modification of the accelerator position sensor 1 according to the embodiment of the present invention.

FIG. 9 is a sectional view of a conventional accelerator position sensor 100.

FIG. 10 is a cross-sectional view of a conventional accelerator position sensor 100, showing an example in which the magnetic circuit 20 and the core 30 are displaced.

[Explanation of symbols] 1 Accelerator position sensor (rotation angle detection device) 10 accelerator pedal module 11 Accelerator pedal unit (rotating member) 12 Bracket (non-rotating member) 20 magnetic circuit 21 York 21b Flat part 23 magnets 30 core 31 core pieces 32 Magnetic detection gap 33 Hall IC (Magnetic detection element) C rotation axis G, K Minimum gap forming part H axis h offset length M magnetic flux V axis W axis v Deviation length θ angle

Continued front page    F term (reference) 2F063 AA35 BA30 BD16 CB12 CC06                       DA05 GA52 NA06                 2F077 AA47 CC02 JJ01 JJ08 JJ23                       VV02

Claims (10)

[Claims] 1. A rotary member or a non-rotary member that rotates according to the rotation of an object to be detected. The rotary member is arranged so as to face the rotary member in a direction orthogonal to the rotary shaft. It is composed of two magnets arranged in substantially the same direction with their magnetic pole directions facing each other and at a right angle, and two magnetic yokes connecting the same magnetic poles of the two magnets. A cylindrical magnetic circuit and two magnetic circuits arranged in the inner space of the magnetic circuit and provided on the other side that changes in angle relative to the magnetic circuit, in a direction orthogonal to the rotation axis of the rotating member. And a core made of a magnetic material, which is divided into the above-mentioned divided portions and in which a magnetic detection element is arranged in a gap formed by the divided portions facing each other, and a relative rotation between the magnetic circuit and the core. Varies with position In the rotation angle detecting device that detects the rotation angle between the rotating member and the non-rotating member based on the output signal of the magnetic detection element, the yokes of the magnetic circuit face each other with the core interposed therebetween. A rotation angle detecting device having a substantially flat surface portion parallel to an axis connecting the both magnets. 2. The magnetism detector is arranged between the two yokes instead of the magnet, and the magnetism detector is arranged in the gap of the core. The rotation angle detection device according to claim 1, wherein the rotation angle detection device is a rotation angle detection device. 3. The rotation angle detecting device according to claim 1, wherein an axial length connecting the both magnets of the flat surface portion is substantially equal to or longer than a diameter of the core. 4. The rotation angle detecting device according to claim 2, wherein an axial length connecting the both magnetic detecting elements of the flat surface portion is substantially equal to or more than a diameter of the core. . 5. The rotation angle detection device according to claim 1, wherein the magnetic detection element is arranged so as to detect a magnetic flux density flowing in a width direction of the gap of the core. . 6. The magnetic detection element is arranged so as to detect a magnetic flux density flowing in a portion where the two yokes are connected, that is, in a width direction of a gap of the yoke. The rotation angle detection device according to claim 2 or claim 4. 7. The yoke according to claim 1, wherein the yoke is fixed to the rotating member that rotates according to the rotation of the object to be detected, and the core is fixed to the non-rotating member. The rotation angle detection device according to claim 5. 8. The core according to claim 2, wherein the core is fixed to the rotating member that rotates according to the rotation of an object to be detected, and the yoke is fixed to the non-rotating member. The rotation angle detection device according to claim 6. 9. The rotation angle detecting device according to claim 1, wherein the rotation angle detecting device is applied to an accelerator position sensor of an automobile, and an initial position is a state in which an accelerator pedal is not depressed. 10. The rotation angle detecting device according to claim 9, wherein, in the initial position, the gap of the core is arranged so as to be orthogonal to the flat surface portion in the axial direction thereof.