JP7334560B2 - Rotation angle detector - Google Patents

Description

The present invention relates to a rotation angle detection device.

2. Description of the Related Art A rotation angle detection device for detecting the position of a rotating object to be detected is disclosed, for example, in Japanese Unexamined Patent Application Publication No. 2002-200214. This rotation angle detection device includes a sensor having a signal generation unit (magnet holding member) to which a magnet is attached and rotating, and magnetic detection means that faces the magnet of the signal generation unit and detects a change in the magnetic field accompanying the rotation of the magnet. unit (detection means holding member), and the signal generation unit is connected to the object to be detected and rotated.

Japanese translation of PCT publication No. 2014-510278

In the rotation angle detection device disclosed in Patent Document 1, for example, when detecting operation of a shift pedal in a quick shifter of a motorcycle, a magnet is installed to prevent erroneous detection due to reliable operation and vibration. A spring mechanism is provided between the attached signal generating unit and the sensor unit, and the spring is pushed by the operation associated with the relative rotation, so that the angle can be detected when an operating force exceeding a predetermined force is applied. . In the conventional spring mechanism, there is a problem that the structure for pressing the spring becomes complicated due to the relative rotation, and the rotation angle detection device itself becomes large.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotation angle detection device that can be simplified in structure and reduced in size.

In order to achieve the above object, a rotation angle detection device according to the present invention includes:
a magnet;
a magnet holding member that holds the magnet;
a magnetic detection means that faces the magnet and detects a change in the magnetic field due to the relative rotation of the magnet;
A detecting means holder mounted to the magnet holding member so as to hold the magnetic detecting means and to be rotatable about a support shaft with respect to the magnet holding member so that the magnet rotates relative to the magnetic detecting means. a member;
an elastic member provided on either one of the magnet holding member and the detecting means holding member and elastically deforming;
It is provided on the other of the magnet holding member and the detection means holding member, and pushes the elastic member so that the elastic member is elastically deformed when the detection means holding member rotates from the home position with respect to the magnet holding member. a presser foot,
It is characterized by

According to the present invention, the structure can be simplified and the size can be reduced.

FIG. 1(a) is a front view of the appearance, and FIG. 1(b) is a rear view of an embodiment of the rotation angle detection device of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1; It is a rear view of the state which removed the cover. 4 is a cross-sectional view taken along line DD in FIG. 3; FIG. (a) is a rear view of only the housing, and (b) is a rear view of only the cover. FIG. 1B is a cross-sectional view taken along the line CC in FIG. It is a cross-sectional view along BB in FIG. 1(a). FIG. 8 is a rear view of another embodiment of the present invention with a cover removed;

A rotation angle detection device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, the rotation angle detection device 1 includes a magnet 10, a magnet holding member 20 for holding the magnet 10, a magnetic detection means 30 for detecting a change in magnetic field due to relative rotation of the magnet 10, It is composed of 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 the present embodiment is used, for example, to detect operation of a shift pedal in a quick shifter of a motorcycle. By operating the shift pedal, the detecting means holding member 40 for holding the magnetism detecting means 30 provided concentrically outside the magnet holding member 20 fixed to hold the magnet 10 is rotated, and the detecting means holding member 40 is moved to the home position P. By rotating the elastic member 50 elastically, the mechanism is simplified and the size of the rotation angle detection device 1 is reduced.

The magnet 10 is, for example, a samarium-cobalt magnet (SmCo: Samarium-Cobalt), and is formed into a desired shape such as a substantially rectangular parallelepiped shape by compressing and sintering a raw powder material (see FIG. 2). . The magnet 10 is magnetized such that two magnetic poles are aligned in a direction (longitudinal direction) along the central axis of the rectangular parallelepiped, for example. The magnet 10 is magnetized, for example, after the magnet 10 in an unmagnetized state is attached to a magnet holding member 20 made of non-magnetic metal, which will be described later, or after being attached to the magnet holding member 20 made of resin by insert molding. . By doing so, the magnet 10 can be fixed at a predetermined position of the magnet holding member 20 and in a desired state of being attached. Alternatively, the magnet 10 magnetized in advance may be attached to the magnet holding member 20 .

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 accommodating the magnet 10, and an elastic member 50. and a spring housing portion 23 for housing. The magnet holding member 20 includes a substantially cylindrical fixed portion 21 made of non-magnetic metal or resin at the center, and a substantially plate-like portion projecting radially to both sides on a plane perpendicular to the central axis of the cylindrical fixed portion 21 . The magnet accommodating portion 22 and the spring accommodating portion 23 are integrally formed.

As shown in FIGS. 2 and 3, the cylindrical fixing portion 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 is fitted in the spline of the support shaft La to be attached in a predetermined direction (rotational position). Fixing by determining the orientation of the cylindrical fixing portion 21 and the support shaft La is not limited to splines, and other structures such as fixing with a key and a key groove may be used.
A 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 removal of the detection means holding member 40 is restrained by a fixing screw 21b and a washer 21c on the support shaft La. The magnet holding member 20 is fixed to the object to be detected (see FIGS. 2 and 7).

As shown in FIGS. 2 and 3, the magnet housing portion 22 is disposed on a plane perpendicular to the central axis of the cylindrical fixing portion 21 so as to protrude radially outward in a substantially trapezoidal shape. A recessed portion 22a for housing 10 is formed. The magnet 10 is attached to the recess 22a, and the magnet 10 is accommodated and fixed so as to be slightly lower than the surface of the recess 22a.

As shown in FIGS. 2 and 3, the spring accommodating portion 23 is arranged to protrude in a substantially rectangular plate shape on the opposite side of the magnet accommodating portion 22 on the radially outer side on a plane perpendicular to the central axis of the cylindrical fixed portion 21 . An opening 23a is formed to sandwich a U-shaped elastic member 50 that opens at the radially outer end. The spring accommodating portion 23 is formed with arm portions 23b left at both end portions of an opening portion 23a (for example, a substantially spanner shape).

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 applied to both ends of the compression coil spring 51 . The end surface member 52 is integrally formed with a disc portion 52a larger than the outer diameter of the compression coil spring 51 and a cylindrical portion 52b protruding axially inward of the compression coil spring 51 from the central portion of the disc portion 52a.

The compression coil spring 51 is arranged so as to be sandwiched between the pair of arm portions 23b of the spring accommodating portion 23 with the pair of end surface members 52 applied to both ends thereof. As a result, the compression coil spring 51 sandwiched between the spring accommodating portions 23 is moved in a direction substantially perpendicular to the radial direction centered on the cylindrical fixing portion 21 (support axis La) (a direction along an arc centered on the support axis La or a direction along the support axis La). elastically deformed in the tangential direction of the circumference centered on the axis La).

The outer diameter of the disc portion 52a of the end surface member 52 sandwiched between the spring accommodating portions 23 is larger than the plate thickness of the arm portion 23b, and the disc portion 52a is partially formed on both sides of the arm portion 23b in the plate thickness direction. It sticks out. As a result, the compression coil spring 51 can be elastically deformed from both sides in the axial direction by pressing the projecting portions on both sides of the disk portion 52a.

In the present embodiment, as shown in FIGS. 2 to 4, a guide shaft 53 is inserted between the pair of arm portions 23b through the compression coil spring 51 and the end member 52 and extends along the axial direction of the compression coil spring 51. is attached and secured with an E-ring. A cylindrical portion 52 b of the end member 52 is slidable on the guide shaft 53 . Thus, the guide shaft 53 and the end member 52 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 relative rotation with respect to the magnet 10 . In this embodiment, the magnet 10 is fixed, and the magnetism detection means 30 rotates with respect to the fixed magnet 10 to detect changes in the magnetic field.

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

A wiring pattern (not shown) is formed on the circuit board 32 to electrically connect the magnetic detecting element 31 and electronic parts. The wiring pattern connects the electronic components and is composed of four wirings, for example, two wirings for power supply and two wirings for extracting signals from the magnetic detecting 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 detecting means holding member 40 and used for connection with an external device or the like.

As shown in FIGS. 1, 2 and 5, the detecting means holding member 40 includes a housing 41 that accommodates and surrounds the magnet holding member 20, and a cover 42 that closes an opening 41a of the housing 41. and resin. As shown in FIG. 5(a), the housing 41 has a substantially drop-shaped outer shape, with a large arc at the base end (lower part in FIG. 5(a)) and a large arc at the tip end (in FIG. 5(a)). (upper part of )) is connected with two straight lines.

The housing 41 has a substantially triangular portion with a small circular arc at the tip as a vertex, which is plate-shaped and serves as a connection input portion 41b having a through hole. For example, a shift pedal is connected to the connection input portion 41b via a connection rod or the like.

The housing 41 has an accommodation space 41c in which the magnet holding member 20 is accommodated, as shown in FIG. 5(a). The accommodation space 41c is formed of a substantially trapezoidal box-shaped concave portion having a large circular arc on the base end side excluding the substantially triangular connection input portion 41b. The accommodation space 41c is sized to accommodate the magnet holding member 20 as a whole, accommodates the magnet accommodation portion 22 and the spring accommodation portion 23 (see FIG. 3), and has a accommodation height sufficient to accommodate the closed cover 42 (see FIG. 3). See Figure 2).

The housing 41 accommodates the magnet holding member 20 fixed to the support shaft La of the object to be detected, and is mounted rotatably around the support shaft La surrounding the outside thereof. As shown in FIGS. 2 and 5(a), the housing 41 has a housing space 41c formed with a rotation support portion 41d forming a bearing for supporting the cylindrical fixed portion 21 of the magnet holding member 20. As shown in FIG. 5(b), a rotation support portion 42a constituting a bearing is formed coaxially. As a result, as shown in FIGS. 2 and 7, the housing (detecting means holding member 40) 41, which is housed in the housing space 41c of the housing 41 and surrounds the magnet holding member 20 in the fixed state, serves as the rotation support portion. The position in the central axis direction is determined by 41d and rotation support portion 42a. At the same time, the housing 41 is rotatably supported 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 the detecting means holding member 40 is prevented from coming off by the support shaft La via the fixing screw 21b and the washer 21c. A dust seal 43 is arranged on the rotation support portion 41 d and the rotation support portion 42 a to prevent dust from entering the housing 41 .

As shown in FIG. 5(b), the cover 42 has a substantially trapezoidal shape with a large arc corresponding to the opening 41a of the housing 41 (see FIG. 5(a)). Covered and attached with screws. As already described, the cover 42 is formed with the rotation support portion 42a, and the dust seal 43 is arranged on the rotation support portion 42a.

As shown in FIGS. 1 and 2, the housing 41 of the detecting means holding member 40 includes a board accommodating portion 44 and a cord holding portion 45. As shown in FIGS. The substrate accommodation portion 44 defines a space for accommodating the magnetic detection element 31 mounted on the circuit board 32, and the magnetic detection element 31 is arranged so as to face the magnet 10 of the magnet holding member 20. While being held, the circuit board 32 is fixed to the board accommodating portion 44 with a screw, an adhesive, or the like.

The cord holding portion 45 is formed in a cylindrical shape and communicates with the side of the substrate housing portion 44 so that the wiring cord 33 connected to the circuit substrate 32 can be led out of the housing 41 .

In the present embodiment, the housing 41 is rotatable about the support axis La with respect to the home position P within an angle range of ±θ, for example, a range of ±3 degrees. is the rotation angle detection range. The home position P is, for example, a neutral position where no operating force acts on the connection input portion 41b of the housing 41, as shown in FIG. The rotation angle is detected by applying an operating force that rotates the housing 41 clockwise or counterclockwise around the home position (neutral position) P. FIG.
For this reason, the housing 41 is formed so that stopper portions 46 protrude on both sides of the inner portion of the tip portion (see FIG. 5(a)). The stopper portion 46 is opposed to the outer surface of the substantially trapezoidal magnet housing portion 22 with a gap in the circumferential direction around the support axis La, and the stopper portion 46 faces the magnet housing portion 22 (see FIG. 2). ), the rotation angle is regulated (see FIG. 3). The rotation angle detection range can be arbitrarily set by changing the circumferential gap about the support axis La between the stopper portion 46 and the outer surface of the magnet housing portion 22 .

When the rotation angle detection device 1 detects the rotation angle, it is necessary to prevent erroneous detection due to detection, vibration, etc., in a state of being reliably operated. Therefore, when the housing 41 is positioned at the home position P and an operation force of a predetermined magnitude or more is applied, the housing 41 rotates, and the rotation angle can be detected. Detection is started when the spring load (reaction force by the spring) is exceeded.

A pair of pressing portions 47 are provided on both sides of the inner portion of the base end portion (lower portion in FIG. 5A) of the housing 41 so as to face the end surface member 52 so as to sandwich the compression coil spring 51 . A pair of pressing portions 48 are also provided on the inner surface of the cover 42 so as to face the end surface member 52 . That is, the compression coil spring 51 is pressed by the pressing portion 47 on the housing 41 side and the pressing portion 48 on the cover 42 side against the respective end members 52 . As a result, when the housing 41 rotates from the home position P, the housing 41 is rotated only after the compression coil spring 51 is pressed by the pressing portions 47 and 48 via the end surface member 52 to elastically deform the compression coil spring 51 . will be Therefore, by adjusting the spring load caused by the elastic deformation of the compression coil spring 51, rotation is prevented until an operating force that overcomes the spring load is applied. The elastic deformation of the compression coil spring 51 occurs in either clockwise or counterclockwise rotation direction from the home position P of the housing 41, and detection of the rotation angle is started by this elastic deformation. After the rotation of the housing 41 occurs, the compression coil spring 51 is further elastically deformed to generate a spring load based on the spring constant.

In the rotation angle detection device 1 of the present embodiment, when the compression coil spring 51 is pressed by the pressing portions 47 and 48, it is pressed in the circumferential direction (arc direction) about the support shaft La. , 48 and the end surface members 52, the compression coil spring 51 can be elastically deformed reliably by pushing through the end surface members 52 at both ends of the compression coil spring 51. FIG. Further, by guiding the end members 52 at both ends of the compression coil spring 51 so as to move linearly along the guide shaft 53, the compression coil spring 51 is prevented from deviating from the central axis direction and elastically deforming. As a result, the compression coil spring 51 can be elastically deformed more reliably, and the spring load generated by the compression coil spring 51 can be efficiently transmitted to the housing 41 as a stable reaction force.

Detection of the rotation angle by such a rotation angle detection device 1 is, for example, when detecting operation of a shift pedal of a quick shifter of a motorcycle, the cylindrical fixing portion 21 of the magnet holding member 20 is positioned on the support shaft La of the object to be detected. , the rotational position is determined and the rotational angle detection device 1 is fixed. Further, the housing 41 is installed at the home position P by connecting a connecting rod that interlocks with the shift pedal to the connecting input portion 41b of the housing 41 so that the operating force is transmitted.

After that, 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 the compression coil spring 51 is elastically deformed. Rotation of the housing 41 is initiated by application of an operating force exceeding the reaction force due to the load.
When the housing 41 starts to rotate, the magnetism detection element 31 rotates relative to the magnet 10 held by the magnet holding member 20, and detects changes in the magnetic field accompanying the relative rotation. A detection signal of the magnetic detection element 31 is processed by an IC chip mounted on the circuit board 32, for example. In the magnetic detection element 31, for example, when the rotation angle changes from the home position P within the range of ±θ, for example, ±3 degrees, an output signal that linearly changes in proportion to the rotation angle in each rotation direction is output. . The output signal is sent to an external device such as a control unit of a transmission through the wiring cord 33 led out from the cord holding unit 45, and the shift operation is automatically performed.

According to the rotation angle detecting device 1, as the housing 41 rotates, the compression coil spring 51 accommodated in the spring accommodating portion 23 of the magnet holding member 20 is elastically deformed by being pushed by the pressing portions 47 and 48. , the reaction force of the spring load allows the driver to reliably sense that the shift pedal has been operated, and the housing 41 can be prevented from rotating due to vibration or the like, thereby ensuring a reliable shift without causing erroneous detection. Pedal operation can be detected.

Further, since the magnet holding member 20 is provided with the spring accommodating portion 23 and the compression coil spring 51 is elastically deformed by the holding portions 47 and 48 of the housing 41 and the cover 42, the number of parts is reduced and the structure of the spring mechanism is simplified. , the rotation angle detection device 1 can be miniaturized.
Further, the spring accommodating portion 23 is provided in the magnet holding member 20 as a spring mechanism, and the pressing portions 47 and 48 of the housing 41 and the cover 42 press the elastic member 50 of the spring accommodating portion 23. The magnet holding member 20 can be arranged at any position around the cylindrical fixing portion 21. For example, as shown in FIG. 23 can also be placed. By changing the shape of the housing 41 accordingly, the rotation angle detection device 1 can be easily installed according to the mounting environment without changing the spring mechanism for elastically deforming the compression coil spring 51. - 特許庁

(Modification)
In the rotation angle detection device 1, the spring accommodating portion 23 provided in the magnet holding member 20 and the holding portion 47 provided in the housing 41 are arranged opposite to each other. The elastic member 50 may be elastically deformed as it rotates.
Further, in the above-described embodiment, the end surface members 52, which are applied to both ends of the elastic member 50, are guided by the guide shafts 53 so as to move in a straight line. The guide shaft 53 can be omitted when the movement range is small.
In addition, as an example of a detection target, detection of operation of a shift pedal in a quick shifter of a motorcycle is used. Suitable for detection.
Further, the rotation angle detection range (±θ) is not limited to, for example, a range of ±3 degrees, and may be a smaller or larger range of angles.
Further, the elastic member 50 is not limited to the compression coil spring 51, and may be another elastic member such as a Belleville spring that generates a spring load due to compression.

As described above in detail together with the embodiments, the rotation angle detection device 1 includes: a magnet 10; a magnet holding member 20 that holds the magnet 10; magnetism detection means 30 for detecting a change in the magnetism detection means 30, and the magnet 10 is rotatable about the support axis La with respect to the magnet holding member 20 so that the magnet 10 rotates relative to the magnetism detection means 30. an elastic member 50 provided on either the magnet holding member 20 or the detecting means holding member 40 and elastically deformable; the magnet holding member 20 and the detecting means holding member 40; pressing portions 47 and 48 provided on either one of the members 40 and pressing the elastic member 50 so that the elastic member 50 is elastically deformed when the detecting means holding member 40 rotates from the home position P with respect to the magnet holding member 20; is configured with
According to such a configuration, the elastic member 50 can be elastically deformed by the elastic member 50 accommodated in the magnet holding member 20 and the pressing portions 47 and 48 provided in the detecting means holding member 40, which facilitates operation. The structure for obtaining the accompanying reaction force can be simplified, and the size of the rotation angle detection device 1 itself can be reduced by relatively rotating on the same axis.

In the rotation angle detection device 1, the elastic member 50 is elastically deformed in an orthogonal direction substantially orthogonal to the radial direction about the support axis La, and the pair of pressing portions 47 and 48 press the elastic member 50 from both sides in the orthogonal direction. It is configured so as to be sandwiched between them.
With such a configuration, the elastic member 50 can be elastically deformed without deviating from its central axis, and the reaction force of the elastic member 50 can be efficiently transmitted to the detecting means holding member 40 on the operating side.

In the rotation angle detection device 1 , the elastic member 50 includes a compression coil spring 51 and a pair of end surface members 52 abutting on both ends of the compression coil spring 51 , and the pair of pressing portions 47 and 48 are configured by the pair of end surface members 52 . , and is configured to press the compression coil spring 51 via the end member 52 when the detecting means holding member 40 rotates from the home position P with respect to the magnet holding member 40 .
According to such a configuration, the compression coil spring 51 is elastically deformed by being pushed through the end surface members 52 at both ends of the compression coil spring 51. Therefore, even if the compression coil spring 51 is pushed in the circumferential direction as the detection means holding member 40 rotates, the compression coil spring 51 is not compressed. By pressing the coil spring 51 via the end surface members 52 at both ends, the coil spring 51 can be linearly pressed and elastically deformed, and a reaction force can be reliably generated.

The rotation angle detection device 1 is provided between a pair of pressing portions 47 and 48, extends along the axial direction of the compression coil spring 51, and includes a guide shaft 53 inserted through the compression coil spring 51. The guide shaft 53 is compressed It is configured to guide linear movement of the end member 52 along the axial direction of the coil spring 51 .
According to this configuration, the end surface member 52 in contact with the compression coil spring 51 is guided by the guide shaft 53 so as to move in a straight line, so that the elastic deformation is in a straight line direction along the guide shaft 53, and the elastic deformation becomes more reliable. It can be elastically deformed to generate a reaction force.

It should be noted that the present invention can be configured by using the configurations described in the respective embodiments singly or in combination.
Moreover, the present invention is not limited to the above embodiments. For example, materials such as magnets, magnet holding members, and housings are not limited to those described above, and may be changed to those having the same functions. The magnetic detection elements are not limited to Hall ICs, and other elements can also be used.

1 Rotation Detection Device 10 Magnet 20 Magnet Holding Member 21 Cylindrical Fixing Part 21a Fixing Hole 21b Fixing Screw 21c Washer 22 Magnet Receiving Part 22a Recess 23 Spring Receiving Part 23a Opening 23b Arm Part 30 Magnetic Detecting Means 31 Magnetic Detecting Element (Hall IC)
32 circuit board 33 wiring cord 40 detector holding member 41 housing 41a opening 41b connection input portion 41c accommodation space 41d rotation support portion 42 cover 42a rotation support portion 43 dust seal 44 board accommodation portion 45 cord holding portion 46 stopper portion 47 pressing portion 48 Pressing portion 50 Elastic member 51 Compression coil spring 52 End member 52a Disk portion 52b Cylindrical portion 53 Guide shaft La Support shaft P Home position θ Rotation angle

Claims (2)

a magnet;
a magnet holding member that holds the magnet;
a magnetic detection means that faces the magnet and detects a change in the magnetic field due to the relative rotation of the magnet;
A detecting means holder mounted to the magnet holding member so as to hold the magnetic detecting means and to be rotatable about a support shaft with respect to the magnet holding member so that the magnet rotates relative to the magnetic detecting means. a member;
an elastic member provided on either one of the magnet holding member and the detecting means holding member and elastically deforming;
It is provided on the other of the magnet holding member and the detection means holding member, and pushes the elastic member so that the elastic member is elastically deformed when the detection means holding member rotates from the home position with respect to the magnet holding member. and a presser foot ,
The elastic member comprises a compression coil spring and a pair of end members applied to both ends of the compression coil spring,
The pair of pressing portions are arranged to sandwich the pair of end surface members, and press the compression coil spring via the end surface members when the detecting means holding member rotates from the home position with respect to the magnet holding member,
A guide shaft is provided between the pair of pressing portions, extends along the axial direction of the compression coil spring, and is inserted through the compression coil spring,
The guide shaft guides linear movement of the end member along the axial direction of the compression coil spring.
A rotation angle detection device characterized by: the elastic member elastically deforms in an orthogonal direction substantially orthogonal to a radial direction about the support shaft;
The pair of pressing portions are arranged to sandwich the elastic member from both sides in the orthogonal direction,
2. The rotation angle detection device according to claim 1, wherein:

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