Rotation Angle Detection Device

Abstract

To provide a rotation angle detector that can have a simplified configuration and be reduced in size.SOLUTION: A rotation angle detector 1 comprises: a magnet 10; a magnet holding member 20 holding the magnet 10; magnetic detection means 30 facing the magnet 10, and detecting a change in a magnetic field by relative rotation of the magnet 10 with a rotation axis as a center; a detection means holding member 40 holding the magnetic detection means 30 and attached to the magnet holding member 20 so as to enable the relative rotation with the rotation axis as the center with respect to the magnet holding member 20; and an elastic member 50 provided at the magnet holding member 20 and elastically deformed in a linear direction. The detection means holding member 40 has pressing portions 47 and 48 pressing the elastic member 50 so that the elastic member 50 is elastically deformed in a direction substantially orthogonal to a radial direction of the rotation axis by the relative rotation.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rotation angle detection device. [Background technology]

[0002] A rotation angle detection device for detecting the position of a rotating object to be detected is disclosed, for example, in Patent Document 1. 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) which faces the magnet of the signal generating unit and has magnetic detection means which 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2014-510278 Summary of the Invention [Problem to be solved by the invention]

[0004] In the rotation angle detection device disclosed in Patent Document 1, for example, when detecting the operation of a shift pedal in a quick shifter of a motorcycle, a spring mechanism is provided between a signal generating unit to which a magnet is attached and a sensor unit to ensure that the operation has been performed reliably and to prevent erroneous detection due to vibration, and the spring is pushed by the operation accompanying relative rotation, so that the angle can be detected when an operating force equal to or greater than a predetermined force is applied. With conventional spring mechanisms, the structure for pushing the spring with relative rotation is complicated, and there is a problem that the rotation angle detection device itself becomes large.

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a rotation angle detection device that can be simplified in structure and made smaller in size. [Means for solving the problem]

[0006] 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: Effect of the Invention

[0007] According to the present invention, the structure can be simplified and the size can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1A is a front view of the exterior of a rotation angle detection device according to an embodiment of the present invention, and FIG. [Diagram 2] 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] FIG. 11 is a rear view with the cover removed. [Figure 4] 4 is a cross-sectional view taken along the line DD in FIG. [Diagram 5] 1A is a rear view of only the housing, and FIG. 1B is a rear view of only the cover. [Figure 6] This is a cross-sectional view taken along line CC in FIG. [Figure 7] FIG. 1B is a cross-sectional view taken along line BB in FIG. [Figure 8] FIG. 13 is a rear view of the other embodiment of the present invention with the cover removed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 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 configured to include 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 approximately perpendicular to the radial direction of the rotating 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 making the rotation angle detection device 1 smaller.

[0010] The magnet 10 is, for example, a samarium-cobalt magnet (SmCo), and is formed into a desired shape, such as a substantially rectangular parallelepiped shape, by compression molding and sintering a powdered material (see FIG. 2). The magnet 10 is magnetized so that the two magnetic poles are aligned, for example, in a direction along the central axis of the rectangular parallelepiped shape (longitudinal direction). 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 a nonmagnetic metal, which will be described later, or after the magnet 10 is attached to a magnet holding member 20 made of a resin by insert molding. In this way, the magnet 10 can be fixed at a predetermined position of the magnet holding member 20 and can be in a desired magnetized state. Note that the magnet 10 that has been magnetized in advance may be attached to the magnet holding member 20.

[0011] 2 and 3, magnet holding member 20 to which magnet 10 is attached includes a cylindrical fixing portion 21 fixed to a detection object, a magnet accommodating portion 22 in which magnet 10 is accommodated, and a spring accommodating portion 23 in which elastic member 50 is accommodated. Magnet holding member 20 is configured by integrally forming cylindrical fixing portion 21, which is substantially cylindrical in the center and made of non-magnetic metal, resin, etc., and substantially plate-shaped magnet accommodating portion 22 and spring accommodating portion 23 protruding radially on both sides on a plane perpendicular to the central axis of cylindrical fixing portion 21.

[0012] 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 with 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 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 slipping out via 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).

[0013] 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 has a recess 22a formed therein in the plate thickness direction from the surface for accommodating the magnet 10. The magnet 10 is attached to the recess 22a, and is accommodated and fixed so as to be slightly lower than the surface of the recess 22a.

[0014] 2 and 3, the spring accommodating portion 23 is disposed protruding in a generally 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 fixing portion 21, and has an opening 23a that sandwiches the U-shaped elastic member 50 and opens at the outer end in the radial direction. The spring accommodating portion 23 is formed (for example, generally wrench-shaped) with arm portions 23b remaining at both ends of the opening 23a.

[0015] 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.

[0016] The compression coil spring 51 is disposed so that a pair of end surface members 52 are abutted against both ends and sandwiched between a pair of arm portions 23b of the spring accommodating portion 23. As a result, the compression coil spring 51 sandwiched in the spring accommodating 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 substantially perpendicular to the radial direction centered on the cylindrical fixing portion 21 (support axis La).

[0017] The outer diameter of the disk portion 52a of the end member 52 sandwiched in the spring accommodating portion 23 is larger than the thickness of the arm portion 23b, and parts of the disk portion 52a protrude from both the front and back sides in the thickness direction of the arm portion 23b. This allows the compression coil spring 51 to be elastically deformed from both sides in the axial direction by pressing the protruding parts on both sides of the disk portion 52a.

[0018] 2 to 4, in this embodiment, a guide shaft 53 is inserted through the compression coil spring 51 and the end surface member 52 between the pair of arm portions 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. Thus, the guide shaft 53 and the end surface member 52 guide the linear movement of the compression coil spring 51 along the axial direction.

[0019] 2, the magnetic detection means 30 faces the magnet 10 and detects a change 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 a change in the magnetic field.

[0020] The magnetic detection means 30 includes 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 composed of a Hall IC that senses a change in the magnetic field caused by relative rotation with respect to the magnet 10. The electronic components are composed of 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.

[0021] 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.

[0022] 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 closes an 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.

[0023] The housing 41 has a plate-shaped, generally triangular portion with a small arc at the tip as its apex, which serves as a connection input portion 41b having a through hole. The connection input portion 41b is connected to, for example, a shift pedal via a connection rod or the like.

[0024] As shown in Fig. 5(a), the housing 41 has an accommodating space 41c in which the magnet holding member 20 is accommodated. The accommodating 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 accommodating space 41c is sized to accommodate the entire magnet holding member 20, accommodates the magnet accommodating portion 22 and the spring accommodating portion 23 (see Fig. 3), and has an accommodating height that can accommodate the magnet holding member 20 when the cover 42 is closed (see Fig. 2).

[0025] 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 magnet holding member 20 from the outside. 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 for supporting the cylindrical fixed portion 21 of the magnet holding member 20, and the cover 42 also has a rotation support portion 42a formed on the same axis as the magnet holding member 20, 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 and fixed in the accommodation space 41c of the housing 41 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 detection object while preventing the detection means holding member 40 from slipping out via a fixing screw 21b and a washer 21c on the support shaft La. A dust seal 43 is disposed on the rotation support portion 41d and the rotation support portion 42a to prevent dust from entering the housing 41.

[0026] 5(b), the cover 42 is generally trapezoidal with a large arc corresponding to the opening 41a (see FIG. 5(a)) of the housing 41 at its lower side, and is attached with screws to close the opening 41a of the housing 41. As already described, the cover 42 is formed with the rotation support portion 42a, and the dust seal 43 is disposed on the rotation support portion 42a.

[0027] 1 and 2, the housing 41 of the detection means holding member 40 includes a board accommodating portion 44 and a cord holding portion 45. The board accommodating portion 44 forms a space for accommodating the magnetic detection element 31 mounted on the circuit board 32, and the magnetic detection element 31 is disposed so as to face the magnet 10 of the magnet holding member 20. While maintaining this state, the circuit board 32 is fixed to the board accommodating portion 44 with screws, adhesive, or the like.

[0028] The cord holding portion 45 is formed in a cylindrical shape and communicates with the side of the board accommodating portion 44 , so that the wiring cord 33 connected to the circuit board 32 can be led out to the outside of the housing 41 .

[0029] In this embodiment, the housing 41 can rotate around the support axis La within a range of angles ±θ, for example, ±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 when an operating force is applied to rotate 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 portion 46 faces 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 regulated by the magnet storage portion 22 (see FIG. 2) coming into contact with the stopper portion 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 portion 46 and the outer surface of the magnet storage portion 22.

[0030] In the rotation angle detection device 1, when detecting the rotation angle, it is necessary to detect it in a reliable operating state and to prevent erroneous detection due to vibration, etc. Therefore, when an operating force of a predetermined magnitude or more is applied with the housing 41 located at the home position P, the housing 41 rotates, enabling the detection of the rotation angle, and detection begins when the spring load (reaction force of the spring) caused by elastic deformation of the elastic member 50 is exceeded.

[0031] 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. That is, the compression coil spring 51 is pressed by the pressing parts 47 on the housing 41 side and the pressing parts 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 then the housing 41 is rotated for the first time. 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. The compression coil spring 51 is elastically deformed in either a clockwise or counterclockwise rotation direction from the home position P of the housing 41, and detection of the rotation angle is initiated by this elastic deformation. 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.

[0032] 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.

[0033] When detecting the operation of a shift pedal of a quick shifter of a motorcycle, for example, the rotation angle detection device 1 detects the rotation angle by fitting the cylindrical fixing portion 21 of the magnet holding member 20 into the spline of the support shaft La of the object to be detected, thereby 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 is transmitted, and the housing 41 is installed so as to be at the home position P.

[0034] 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 the compression coil spring 51 elastically deforms. 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 an angle ±θ, for example within a range of ±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 rotation direction. The output signal is sent to an external device, such as a transmission control unit, via a wiring cord 33 that is led out from the cord holding unit 45 to the outside, and the gear shift operation is performed automatically.

[0035] According to this rotation angle detection device 1, as the housing 41 rotates, the compression coil spring 51 housed in the spring accommodating portion 23 of the magnet holding member 20 is pressed by the pressing portions 47, 48, causing elastic deformation. This enables the driver to reliably sense that the shift pedal has been operated by the reaction force due to the spring load, and prevents the housing 41 from rotating due to vibration or the like. As a result, no erroneous detection occurs and the operation of the shift pedal can be reliably detected.

[0036] In addition, a spring accommodating section 23 is provided in the magnet holding member 20, and the compression coil spring 51 is elastically deformed by the pressing sections 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 enabling the rotation angle detection device 1 to be made smaller. Moreover, it is sufficient to provide the spring accommodating portion 23 in the magnet holding member 20 as a spring mechanism and have the pressing portions 47, 48 of the housing 41 and the cover 42 press the elastic member 50 of the spring accommodating portion 23, and the spring accommodating portion 23 can be disposed at any position around the cylindrical fixing portion 21 of the magnet holding member 20. 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.

[0037] (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 the above embodiment, the end 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 caused by 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.

[0038] 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 shaft 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.

[0039] 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 such a configuration, in the rotation angle detection device 1, the pressing portion 47 of the housing 41 and the pressing portion 48 of the cover 42 can be elastically deformed by pressing the elastic member 50, and a reaction force can be surely generated.

[0040] 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 to face each other. According to such a configuration, the pressing portion 47 of the housing 41 and the pressing portion 48 of the cover 42 can be elastically deformed by pressing the elastic member 50 while facing each other, and a reaction force can be surely generated.

[0041] In the rotation angle detection device 1, The housing 41 has a housing space 41c for housing the magnet holding member 20, The housing space 41c is constituted by a substantially trapezoidal recess. According to such a configuration, the rotation angle detection device 1 can house the magnet holding member 20 in the housing space 41c of the housing 41, and can surely generate a reaction force with a simple and compact configuration.

[0042] In the rotation angle detection device 1, The housing space 41c has a spring housing portion 23 for housing the elastic member 50. According to such a configuration, in the rotation angle detection device 1, the elastic member 50 housed in the spring housing portion 23 of the housing space 41c is elastically deformed in a direction orthogonal to the radial direction of the rotation axis, and a reaction force can be surely generated.

[0043] In the rotation angle detection device 1, The elastic member 50 is composed of a compression coil spring 51 and an end face member 52, The magnet holding member 20 sandwiches a pair of end face members 52 that are applied to both ends of the compression coil spring 51, The pair of pressing portions 47, 48 are arranged so as to sandwich the pair of end face members 52, and press the compression coil spring 51 via the end face members 52 due to the relative rotation. According to 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.

[0044] 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. [Explanation of symbols]

[0045] 1 Rotation detection device 10. Magnets 20 Magnet holding member 21 Cylinder fixing part 21a Fixing hole 21b Fixing screw 21c Washer 22 Magnet housing 22a Recess 23 Spring housing 23a opening 23b Arm section 30 Magnetic detection means 31 Magnetic detection element (Hall IC) 32 Circuit Board 33 Wiring cord 40 Detection means holding member 41 Housing 41a opening 41b Connection input section 41c Containment Space 41d Rotation support part 42 Cover 42a Rotation support part 43 Dust seal 44 Substrate storage section 45 Cord holder 46 Stopper part 47 Presser section 48 Presser section 50 Elastic member 51 Compression coil spring 52 End face member 52a Disc section 52b Cylindrical part 53 Guide shaft La support shaft P Home Position θ Rotation angle

Claims

1. 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:

2. 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 .

3. 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.

4. the housing has an accommodation 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.

5. The accommodation space has a spring accommodation portion that accommodates the elastic member.

5. The rotation angle detection device according to claim 4.

6. 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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