JP2024138476A - Rotation Angle Detection Device - Google Patents

Abstract

[Problem] To provide a rotation angle detection device that can be simplified in structure and made smaller. [Solution] The rotation angle detection device 1 comprises a magnet 10, a magnet holding member 20 that holds the magnet 10, a magnetic detection means 30 that faces the magnet 10 and detects changes in the magnetic field caused by the relative rotation of the magnet 10 about the rotation axis, a detection means holding member 40 that holds the magnetic detection means 30 and is attached to the magnet holding member 20 to enable the relative rotation about the rotation axis with respect to the magnet holding member 20, and an elastic member 50 that is provided on the magnet holding member 20 and elastically deforms in a linear direction, and the detection means holding member 40 has pressing portions 47, 48 that press the elastic member 50 so that the relative rotation causes the elastic member 50 to elastically deform in a direction approximately perpendicular to the radial direction of the rotation axis. [Selected Figure] Figure 3

Description

The present invention relates to a rotation angle detection device.

For example, Patent Document 1 discloses a rotation angle detection device for detecting the position of a rotating object. This rotation angle detection device has a signal generating unit (magnet holding member) to which a magnet is attached and which rotates, and a sensor unit (detection means holding member) that faces the magnet of the signal generating unit and has a magnetic detection means that detects changes in the magnetic field caused by the rotation of the magnet, and the signal generating unit is connected to the object to be detected and rotated.

Special Publication No. 2014-510278

In the rotation angle detection device disclosed in Patent Document 1, for example, when detecting the operation of the shift pedal in a quick shifter of a motorcycle, a spring mechanism is provided between the sensor unit and a signal generating unit to which a magnet is attached in order to ensure that the operation has been performed and to prevent erroneous detection due to vibration, and the spring is pushed by the operation associated with relative rotation, so that the angle can be detected when an operating force equal to or greater than a predetermined force is applied. With previous spring mechanisms, the structure for pushing the spring associated with relative rotation is complicated, and there is a problem in that the rotation angle detection device itself becomes large.

The present invention was made in consideration of the above problems, and aims to provide a rotation angle detection device that can be simplified in structure and made smaller.

In order to achieve the above object, a rotation angle detection device according to the present invention comprises:
A magnet,
A magnet holding member for holding the magnet;
a magnetic detection means for detecting a change in a magnetic field caused by the relative rotation of the magnet around a rotation axis, the magnetic detection means being opposed to the magnet;
a detection means holding member that holds the magnetic detection means and is attached to the magnetic detection means so as to be capable of rotating relative to the magnet holding member around the rotation axis;
an elastic member provided on the magnet holding member and elastically deformable in a linear direction;
the detection means holding member has a pressing portion that presses the elastic member so that the elastic member is elastically deformed in a direction substantially perpendicular to a radial direction of the rotation shaft by the relative rotation;
It is characterized by:

The present invention allows for a simplified structure and miniaturization.

1A is a front view of the exterior of a rotation angle detection device according to an embodiment of the present invention, and FIG. This is a cross-sectional view taken along line AA in FIG. FIG. 11 is a rear view with the cover removed. This is a cross-sectional view taken along the line D-D in FIG. 1A is a rear view of only the housing, and FIG. 1B is a rear view of only the cover. 1B is a cross-sectional view taken along the line CC in FIG. 1(a) BB cross-sectional view. FIG. 13 is a rear view of the other embodiment of the present invention with the cover removed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotation angle detection device according to an embodiment of the present invention will now be described with reference to the accompanying drawings.
As shown in Figures 1 to 3, the rotation angle detection device 1 is composed of a magnet 10, a magnet holding member 20 that holds the magnet 10, a magnetic detection means 30 that detects changes in the magnetic field due to relative rotation of the magnet 10, a detection means holding member 40 that holds the magnetic detection means 30, and an elastic member 50 provided between the magnet holding member 20 and the detection means holding member 40.
The rotation angle detection device 1 according to this embodiment is used, for example, to detect the operation of a shift pedal in a quick shifter of a motorcycle. By operating the shift pedal, the elastic member 50 housed in the magnet holding member 20 that holds the magnet 10 is elastically deformed in a direction substantially perpendicular to the radial direction of the rotation shaft by pressing portions 47, 48 provided on the detection means holding member 40 that houses the magnet holding member 20 and holds the magnetic detection means 30, thereby simplifying the mechanism and reducing the size of the rotation angle detection device 1.

The magnet 10 is, for example, a samarium-cobalt magnet (SmCo), and is formed into a desired shape, such as a roughly rectangular parallelepiped shape, by compressing and sintering the powder raw material (see FIG. 2). The magnet 10 is magnetized so that the two magnetic poles are aligned, for example, along the central axis of the rectangular parallelepiped shape (longitudinal direction). The magnet 10 is magnetized, for example, after the unmagnetized magnet 10 is attached to a magnet holding member 20 made of a nonmagnetic metal, which will be described later, or after it is attached to a resin magnet holding member 20 by insert molding. In this way, the magnet 10 can be fixed at a predetermined position on the magnet holding member 20 and can be in a desired magnetized state. Note that a magnet 10 that has been magnetized in advance may be attached to the magnet holding member 20.

As shown in Figures 2 and 3, the magnet holding member 20 to which the magnet 10 is attached comprises a cylindrical fixing portion 21 fixed to the object to be detected, a magnet accommodating portion 22 in which the magnet 10 is accommodated, and a spring accommodating portion 23 in which the elastic member 50 is accommodated. The magnet holding member 20 is configured by integrally forming a generally cylindrical cylindrical fixing portion 21 at the center, which is made of a non-magnetic metal or resin, and a generally plate-shaped magnet accommodating portion 22 and a spring accommodating portion 23 that protrude radially on both sides on a plane perpendicular to the central axis of the cylindrical fixing portion 21.

2 and 3, the cylindrical fixing part 21 has a fixing hole 21a at its center, and is attached and fixed to a support shaft La provided on the object to be detected. A spline is formed in the fixing hole 21a, and the fixing hole 21a is fitted into the spline of the support shaft La and attached in a predetermined orientation (rotational position). Fixing the cylindrical fixing part 21 to the support shaft La by determining the orientation is not limited to the case of using a spline, and other structures such as fixing with a key and a key groove may also be used.
In addition, the detection means holding member 40, which will be described later, is rotatably attached to the cylindrical fixing portion 21 of the magnet holding member 20, and the detection means holding member 40 is prevented from coming loose by the fixing screw 21b and the washer 21c on the support shaft La, and the magnet holding member 20 is fixed to the object to be detected (see Figures 2 and 7).

As shown in Figures 2 and 3, the magnet storage section 22 is disposed so as to protrude radially outward in a generally trapezoidal shape on a plane perpendicular to the central axis of the cylindrical fixing section 21, and a recess 22a is formed from the surface in the plate thickness direction to accommodate the magnet 10. The magnet 10 is attached to the recess 22a, and is stored and fixed so that it is slightly lower than the surface of the recess 22a.

2 and 3, the spring housing 23 is disposed in a generally rectangular plate shape protruding outward in the radial direction on the opposite side to the magnet housing 22 on the plane perpendicular to the central axis of the cylindrical fixing part 21, and has an opening 23a that sandwiches the U-shaped elastic member 50 that opens at the outer end in the radial direction. The spring housing 23 is formed with arm parts 23b remaining at both ends of the opening 23a (for example, generally wrench shaped).

As shown in FIGS. 2 to 4 and 6, the spring accommodating portion 23 accommodates an elastic member 50 that constitutes a spring mechanism.
The elastic member 50 includes, for example, a compression coil spring 51 and a pair of end surface members 52 that are abutted against both ends of the compression coil spring 51. The end surface member 52 is integrally formed with a disk portion 52a that is larger in outer diameter than the compression coil spring 51, and a cylindrical portion 52b that protrudes from the center of the disk portion 52a toward the inside in the axial direction of the compression coil spring 51.

The compression coil spring 51 is arranged so that a pair of end surface members 52 are attached to both ends and sandwiched between a pair of arm portions 23b of the spring housing portion 23. As a result, the compression coil spring 51 sandwiched in the spring housing portion 23 is elastically deformed in a direction (a direction along a circular arc centered on the support axis La or a tangent direction to a circumference centered on the support axis La) that is approximately perpendicular to the radial direction centered on the cylindrical fixing portion 21 (support axis La).

The end surface member 52 sandwiched in the spring housing portion 23 has an outer diameter of the disk portion 52a that is larger than the thickness of the arm portion 23b, and a part of the disk portion 52a protrudes on both sides in the thickness direction of the arm portion 23b. This allows the compression coil spring 51 to be elastically deformed from either side in the axial direction by pressing the protruding parts on both sides of the disk portion 52a.

In this embodiment, as shown in Figs. 2 to 4, a guide shaft 53 is inserted through the compression coil spring 51 and the end surface member 52 between the pair of arms 23b, extends along the axial direction of the compression coil spring 51, and is fixed with an E-ring. The cylindrical portion 52b of the end surface member 52 is allowed to slide on the guide shaft 53. This allows the guide shaft 53 and the end surface member 52 to guide the linear movement of the compression coil spring 51 along the axial direction.

As shown in FIG. 2, the magnetic detection means 30 faces the magnet 10 and detects changes in the magnetic field caused by rotating relative to the magnet 10. In this embodiment, the magnet 10 is fixed, and the magnetic detection means 30 rotates relative to the fixed magnet 10 to detect changes in the magnetic field.

The magnetic detection means 30 is configured to include a magnetic detection element 31 and a circuit board 32. The magnetic detection element 31 and electronic components (not shown) are mounted on the circuit board 32 and electrically connected. The magnetic detection element 31 is configured with a Hall IC or the like that senses a change in the magnetic field that accompanies relative rotation with respect to the magnet 10. The electronic components are configured with components such as an IC chip that processes the output signal of the magnetic detection element 31 and a capacitor that constitutes a protection circuit.
The magnetic detection element 31 is attached to the surface of the circuit board 32 facing the magnet 10 , and electronic components and the like are attached to the surface of the circuit board 32 opposite the magnet 10 .

A wiring pattern (not shown) is formed on the circuit board 32 to electrically connect the magnetic detection element 31 and electronic components. The wiring pattern connects the electronic components and is composed of four wires, for example, two wires for power supply and two wires for extracting signals from the magnetic detection means 30. The magnetic detection means 30 is housed in a detection means holding member 40 (see FIG. 2).
A wiring cord 33 connected to the wiring pattern of the circuit board 32 is led out from the detection means holding member 40 to the outside, and is used for connection to an external device or the like.

As shown in Figs. 1, 2 and 5, the detection means holding member 40 is made of metal, resin or the like and includes a housing 41 that houses and surrounds the magnet holding member 20 and a cover 42 that covers the opening 41a of the housing 41. As shown in Fig. 5(a), the housing 41 has a roughly teardrop-shaped outer shape, with a large arc at the base end (lower part in Fig. 5(a)) and a small arc at the tip end (upper part in Fig. 5(a)) connected by two straight lines.

The housing 41 has a roughly triangular portion with a small arc at the tip as its apex, which is a plate-shaped connection input portion 41b with a through hole. The connection input portion 41b is connected to, for example, a shift pedal via a connecting rod or the like.

As shown in FIG. 5(a), the housing 41 has an accommodation space 41c in which the magnet holding member 20 is accommodated. The accommodation space 41c is configured as a substantially trapezoidal box-shaped recess with a large arc on the base end side, excluding the substantially triangular connecting input portion 41b, as its lower side. The accommodation space 41c is large enough to accommodate the entire magnet holding member 20, accommodates the magnet accommodation portion 22 and the spring accommodation portion 23 (see FIG. 3), and has an accommodation height that allows the cover 42 to be closed and accommodated (see FIG. 2).

The housing 41 accommodates the magnet holding member 20 fixed to the support axis La of the object to be detected, and is mounted so as to be rotatable around the support axis La (also called the rotation axis) while surrounding the outside of the magnet holding member 20. As shown in FIG. 2 and FIG. 5(a), the housing 41 has a rotation support portion 41d in the accommodation space 41c that constitutes a bearing supporting the cylindrical fixed portion 21 of the magnet holding member 20, and the cover 42 also has a rotation support portion 42a formed thereon that constitutes a bearing on the same axis as shown in FIG. 5(b). As a result, as shown in FIG. 2 and FIG. 7, the position of the housing (detection means holding member 40) 41 that surrounds the outside of the magnet holding member 20 accommodated in the accommodation space 41c of the housing 41 and in a fixed state is determined in the central axis direction by the rotation support portion 41d and the rotation support portion 42a. At the same time, the housing 41 is supported so as to be rotatable around the rotation support portion 41d and the rotation support portion 42a (see FIG. 2). The magnet holding member 20 is fixed to the object to be detected while preventing the detection means holding member 40 from slipping out via the fixing screw 21b and washer 21c on the support shaft La. Dust seals 43 are placed on the rotation support parts 41d and 42a to prevent dust from entering the housing 41.

As shown in FIG. 5(b), the cover 42 is generally trapezoidal with a large arc at the bottom that corresponds to the opening 41a (see FIG. 5(a)) of the housing 41, and is attached with screws to close the opening 41a of the housing 41. As already described, the cover 42 is formed with a rotation support portion 42a, and a dust seal 43 is disposed on the rotation support portion 42a.

As shown in Figs. 1 and 2, the housing 41 of the detection means holding member 40 includes a board accommodating section 44 and a code holding section 45. The board accommodating section 44 forms a space for accommodating the magnetic detection element 31 mounted on the circuit board 32, and the magnetic detection element 31 is positioned so as to face the magnet 10 of the magnet holding member 20. This state is maintained while the circuit board 32 is fixed to the board accommodating section 44 with screws, adhesive, or the like.

The cord holding section 45 is cylindrically shaped and communicates with the side of the board housing section 44, allowing the wiring cord 33 connected to the circuit board 32 to be led out of the housing 41.

In this embodiment, the housing 41 can rotate around the support axis La within a range of angles ±θ, for example, within a range of ±3 degrees, relative to the home position P, and this rotation range (for example, a range of 6 degrees) is the detection range for the rotation angle. The home position P is a neutral position where no operating force acts on the connection input portion 41b of the housing 41, as shown in Fig. 3, for example. The rotation angle is detected by the application of an operating force that rotates the housing 41 clockwise or counterclockwise around the home position (neutral position) P.
For this reason, the housing 41 is formed so that stopper portions 46 protrude from both sides of the inner portion of the tip portion (see FIG. 5(a)). The stopper portions 46 face the outer surface of the substantially trapezoidal magnet storage portion 22 with a circumferential gap centered on the support axis La, and the rotation angle is restricted when the magnet storage portion 22 (see FIG. 2) comes into contact with the stopper portions 46 (see FIG. 3). The detection range of the rotation angle can be set arbitrarily by changing the circumferential gap centered on the support axis La between the stopper portions 46 and the outer surface of the magnet storage portion 22.

When detecting the rotation angle, the rotation angle detection device 1 must detect the rotation angle while it is being operated reliably, and must prevent erroneous detection due to vibrations, etc. Therefore, when an operating force of a predetermined magnitude or greater is applied while the housing 41 is located at the home position P, the housing 41 rotates, allowing the rotation angle to be detected, and detection begins when the spring load (reaction force from the spring) caused by elastic deformation of the elastic member 50 is exceeded.

A pair of pressing parts 47 are provided facing each other on both sides of the inside of the base end (lower part in FIG. 5(a)) of the housing 41, and are abutted against the end surface member 52 so as to sandwich the compression coil spring 51. A pair of pressing parts 48 are also provided facing each other on the inner surface of the cover 42 and are abutted against the end surface member 52. In other words, the compression coil spring 51 is pressed by the pressing part 47 on the housing 41 side and the pressing part 48 on the cover 42 side abutting each end surface member 52. As a result, when the housing 41 rotates from the home position P, the compression coil spring 51 is pressed by the pressing parts 47 and 48 via the end surface member 52, causing the compression coil spring 51 to elastically deform, and the housing 41 is not rotated until that happens. Therefore, by adjusting the spring load caused by the elastic deformation of the compression coil spring 51, rotation is prevented from occurring until an operating force that overcomes the spring load acts. Elastic deformation of the compression coil spring 51 occurs whether the housing 41 is rotated clockwise or counterclockwise from the home position P, and this elastic deformation initiates detection of the rotation angle. After the housing 41 rotates, the compression coil spring 51 is further elastically deformed, and a spring load based on the spring constant is generated.

In the rotation angle detection device 1 of this embodiment, when the compression coil spring 51 is pressed by the pressing portions 47, 48, it is pressed in a circumferential direction (arc direction) centered on the support axis La. Even if the contact points between the pressing portions 47, 48 and the end surface members 52 change, the compression coil spring 51 can be reliably elastically deformed by pressing through the end surface members 52 at both ends of the compression coil spring 51.
Furthermore, by guiding the end members 52 at both ends of the compression coil spring 51 so that they move in a straight line along the guide shafts 53, the compression coil spring 51 is prevented from being deviated from the central axial direction and elastically deforming. This makes it possible to more reliably elastically deform the compression coil spring 51, and to efficiently transmit the spring load generated by the compression coil spring 51 to the housing 41 as a stable reaction force.

When detecting the rotation angle using this type of rotation angle detection device 1, for example, when detecting the operation of the shift pedal of a quick shifter of a motorcycle, the cylindrical fixing portion 21 of the magnet holding member 20 is fitted into the spline of the support shaft La of the object to be detected, determining the rotation position and fixing the rotation angle detection device 1. In addition, a connecting rod that works in conjunction with the shift pedal is connected to the connecting input portion 41b of the housing 41 so that the operating force can be transmitted, and the housing 41 is installed so that it is in the home position P.

Thereafter, when the shift pedal is operated, an operating force acts on the housing 41 via the connecting rod, but the housing 41 does not rotate until elastic deformation of the compression coil spring 51 occurs. When an operating force that exceeds the reaction force due to the spring load caused by the set elastic deformation is applied, the housing 41 begins to rotate.
When the housing 41 starts to rotate, the magnetic detection element 31 rotates relative to the magnet 10 held by the magnet holding member 20, and detects a change in the magnetic field caused by the relative rotation. The detection signal of the magnetic detection element 31 is processed by, for example, an IC chip mounted on the circuit board 32.
For example, when the rotation angle changes within a range of ±θ, for example ±3 degrees, from the home position P, the magnetic detection element 31 outputs an output signal that changes linearly in proportion to the rotation angle in each direction of rotation. The output signal is sent to an external device, such as a control unit of a transmission, via a wiring cord 33 that is led out from the cord holding unit 45 to the outside, and the gear shift operation is automatically performed.

With this rotation angle detection device 1, the compression coil spring 51 housed in the spring housing 23 of the magnet holding member 20 is elastically deformed by being pressed by the pressing portions 47, 48 as the housing 41 rotates. This allows the driver to sense that the shift pedal has been operated reliably through the reaction force caused by the spring load, and prevents the housing 41 from rotating due to vibrations, etc., and prevents false detections from occurring, ensuring that the operation of the shift pedal can be detected reliably.

In addition, a spring accommodating portion 23 is provided in the magnet holding member 20, and the compression coil spring 51 is elastically deformed by the pressing portions 47, 48 of the housing 41 and the cover 42. This reduces the number of parts and simplifies the structure of the spring mechanism, thereby making it possible to miniaturize the rotation angle detection device 1.
Moreover, the spring accommodating portion 23 may be provided in the magnet holding member 20 as a spring mechanism, and the pressing portions 47, 48 of the housing 41 and the cover 42 may press the elastic member 50 of the spring accommodating portion 23, so that the spring accommodating portion 23 can be disposed at any position around the cylindrical fixing portion 21 of the magnet holding member 20, and for example, as shown in Fig. 8, the spring accommodating portion 23 can be disposed by rotating it about 120 degrees clockwise with respect to the connecting input portion 41b. As a result, by changing the shape of the housing 41 to a corresponding shape, the rotation angle detection device 1 can be easily installed according to the installation environment, without changing the spring mechanism that elastically deforms the compression coil spring 51.

(Modification)
In the rotation angle detection device 1, the spring accommodating portion 23 provided on the magnet holding member 20 and the pressing portion 47 provided on the housing 41 may be installed opposite to each other, with the spring accommodating portion provided on the housing 41 and the pressing portion provided on the magnet holding member 20 so as to elastically deform the elastic member 50 as the magnet holding member 20 rotates.
In addition, in the above embodiment, the end surface members 52 that abut against both ends of the elastic member 50 are guided by the guide shafts 53 to move in a straight line, but in cases where the detection range is small and the range of movement associated with the elastic deformation of the elastic member 50 is small, it is possible to omit the guide shafts 53.
In addition, detection of the operation of the shift pedal in a quick shifter of a motorcycle has been used as an example of an object to be detected, but the present invention is not limited to this and can be applied to detection of other rotation angles, and is particularly suitable for detection of rotation angles in a vibration environment.
Furthermore, the detection range of the rotation angle (±θ) is not limited to, for example, a range of ±3 degrees, and angles smaller or larger than this range may be detected.
Furthermore, the elastic member 50 is not limited to being configured by the compression coil spring 51, but may be configured by other elastic members such as Belleville springs that generate a spring load when compressed.

As specifically described above in conjunction with the embodiment, the rotation angle detection device 1 has the following features:
The magnet holding member 20 comprises a magnet 10, a magnet holding member 20 which holds the magnet 10, a magnetic detection means 30 which faces the magnet 10 and detects changes in the magnetic field caused by the relative rotation of the magnet 10 about the rotation axis, a detection means holding member 40 which holds the magnetic detection means 30 and is attached to the magnet holding member 20 to enable the relative rotation about the rotation axis with respect to the magnet holding member 20, and an elastic member 50 which is provided on the magnet holding member 20 and elastically deforms in a linear direction, and the detection means holding member 40 has pressing portions 47, 48 which press the elastic member 50 so that the relative rotation causes the elastic member 50 to elastically deform in a direction approximately perpendicular to the radial direction of the rotation axis.
According to this configuration, the rotation angle detection device 1 can reliably generate a reaction force with a simple and compact configuration by elastically deforming the elastic member 50 housed in the magnet holding member 20 that holds the magnet 10 in a direction perpendicular to the radial direction of the rotation axis using the pressure portions 47, 48 provided on the detection means holding member 40 that houses the magnet holding member 20 and holds the magnetic detection means 30.

In the rotation angle detection device 1,
The detection means holding member 40 is composed of a housing 41 and a cover 42, and the housing 41 and the cover 42 have pressing portions 47, 48, respectively.
According to this configuration, the rotation angle detection device 1 can reliably generate a reaction force by the pressing portion 47 of the housing 41 and the pressing portion 48 of the cover 42 pressing the elastic member 50 to cause elastic deformation.

In the rotation angle detection device 1,
The pressing portion 47 of the housing 41 and the pressing portion 48 of the cover 42 are provided opposite to each other.
According to this configuration, the pressing portion 47 of the housing 41 and the pressing portion 48 of the cover 42 face each other and press the elastic member 50, causing it to elastically deform, thereby making it possible to reliably generate a reaction force.

In the rotation angle detection device 1,
The housing 41 has an accommodation space 41c for accommodating the magnet holding member 20,
The accommodation space 41c is configured as a substantially trapezoidal recess.
According to this configuration, the rotation angle detection device 1 can accommodate the magnet holding member 20 in the accommodation space 41c of the housing 41, and can reliably generate a reaction force with a simple and compact configuration.

In the rotation angle detection device 1,
The accommodation space 41 c has a spring accommodation portion 23 that accommodates the elastic member 50 .
With this configuration, the rotation angle detection device 1 can reliably generate a reaction force by elastically deforming the elastic member 50 accommodated in the spring accommodating portion 23 of the accommodation space 41c in a direction perpendicular to the radial direction of the rotation shaft.

In the rotation angle detection device 1,
The elastic member 50 is composed of a compression coil spring 51 and an end surface member 52.
The magnet holding member 20 sandwiches a pair of end members 52 that are abutted against both ends of the compression coil spring 51,
The pair of pressing portions 47, 48 are disposed so as to sandwich a pair of end surface members 52 therebetween, and press the compression coil spring 51 via the end surface members 52 by the relative rotation.
With this configuration, the rotation angle detection device 1 can reliably elastically deform the compression coil spring 51 to generate a reaction force by the pressing portions 47, 48 pressing through the end surface members 52 at both ends of the compression coil spring 51.

The present invention can be configured by using the configurations described in the respective embodiments alone or in combination.
Furthermore, the present invention is not limited to the above embodiment. For example, the materials of the magnet, magnet holding member, housing, etc. are not limited to those described above and can be changed to those having the same functions. The magnetic detection element is not limited to a Hall IC and other elements can be used.

REFERENCE SIGNS LIST 1 Rotation detection device 10 Magnet 20 Magnet holding member 21 Cylindrical fixing portion 21a Fixing hole 21b Fixing screw 21c Washer 22 Magnet accommodating portion 22a Recess 23 Spring accommodating portion 23a Opening 23b Arm portion 30 Magnetic detection means 31 Magnetic detection element (Hall IC)
Reference Signs List 32 Circuit board 33 Wiring cord 40 Detection means holding member 41 Housing 41a Opening 41b Connection input portion 41c Storage space 41d Rotation support portion 42 Cover 42a Rotation support portion 43 Dust seal 44 Board storage portion 45 Cord holding portion 46 Stopper portion 47 Pressing portion 48 Pressing portion 50 Elastic member 51 Compression coil spring 52 End surface member 52a Disc portion 52b Cylindrical portion 53 Guide shaft La Support shaft P Home position θ Rotation angle

Claims (6)

A magnet,
A magnet holding member for holding the magnet;
a magnetic detection means for detecting a change in a magnetic field caused by the relative rotation of the magnet around a rotation axis, the magnetic detection means being opposed to the magnet;
a detection means holding member that holds the magnetic detection means and is attached to the magnetic detection means so as to be capable of rotating relative to the magnet holding member around the rotation axis;
an elastic member provided on the magnet holding member and elastically deformable in a linear direction;
the detection means holding member has a pressing portion that presses the elastic member so that the elastic member is elastically deformed in a direction substantially perpendicular to a radial direction of the rotation shaft by the relative rotation;
A rotation angle detection device characterized by: The detection means holding member is composed of a housing and a cover,
The housing and the cover each have the pressing portion.
2. The rotation angle detection device according to claim 1 . The pressing portion of the housing and the pressing portion of the cover are provided opposite to each other.
3. The rotation angle detection device according to claim 2. the housing has an accommodating space for accommodating the magnet holding member,
The storage space is configured as a substantially trapezoidal recess.
3. The rotation angle detection device according to claim 2. The accommodation space has a spring accommodation portion that accommodates the elastic member.
5. The rotation angle detection device according to claim 4. The elastic member is composed of a compression coil spring and an end surface member,
the magnet holding member holds the pair of end members that are to be abutted against both ends of the compression coil spring,
The pair of pressing portions are disposed to sandwich the pair of end surface members, and press the compression coil spring via the end surface members by the relative rotation.
6. The rotation angle detection device according to claim 1, wherein the rotation angle detection device is a rotation angle sensor.

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