JP2021173571A - Position detection device - Google Patents

Abstract

To provide a position detection device capable of suppressing stress concentration.SOLUTION: A position detection device 100 comprises: a lever part 10 for, in accordance with traveling of a subject to be detected, rotating around an axis AX; a rotary body 20 for rotating around the axis AX together with the lever part 10; and a detection part for detecting rotation of the rotary body 20. The lever part 10 comprises: a first plate part 111; a second plate part 112 which positions farther from the axis AX than the first plate part 111 positions, and has thinner thickness than the first plate part 111 has; and a taper part 113 which extends into a radial direction around the axis AX, for coupling the first plate part 111 and the second plate part 112. The taper part 113 includes an inclined plane 113f for coupling a surface of the first plate part 111 and a surface of the second plate part 112. At the taper part 113, a groove part 70 is formed, which is concave from the inclined plane 113f, and runs along the radial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a position detecting device.

For example, in the rotation sensor device described in Patent Document 1, the magnet element rotates with respect to the sensor element as the lever element rotates. As a result, the sensor element detects the rotation of the lever element.

U.S. Patent Application Publication No. 2017/0276511

In the configuration of Patent Document 1, the lever element is formed in a flat plate shape extending in a direction orthogonal to the rotation center axis thereof. Therefore, when a force in the direction along the rotation center axis is applied to the end portion of the lever element far from the rotation center axis, stress may be concentrated on the peripheral portion of the rotation center axis of the lever element.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a position detecting device capable of suppressing stress concentration.

In order to achieve the above object, the position detection device according to the present invention is
A lever that rotates around the axis according to the movement of the target for position detection,
A rotating body that rotates around the axis together with the lever portion,
A detection unit for detecting the rotation of the rotating body is provided.
The lever portion is located at a distance from the axis of the first plate portion and the first plate portion, and is thinner than the first plate portion in the radial direction around the axis. A tapered portion that extends and connects the first plate portion and the second plate portion is provided.
The tapered portion has an inclined surface connecting the surface of the first plate portion and the surface of the second plate portion.
The tapered portion is recessed from the inclined surface and has a groove portion along the radial direction.

According to the present invention, stress concentration can be suppressed.

It is a top view of the position detection apparatus which concerns on one Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA shown in FIG. 1 of the position detection device according to the same embodiment. It is a perspective view of the position detection apparatus which concerns on the said embodiment. It is a perspective view of the position detection apparatus which concerns on the said embodiment. FIG. 3 is a cross-sectional view taken along the line BB shown in FIG. 1 of the tapered portion according to the same embodiment. It is an enlarged cross-sectional view of the main part of the position detection apparatus which concerns on the said embodiment. (A) is a schematic diagram showing the relationship between the receiving member and the facing portion of the holder according to the same embodiment, and (b) is a schematic diagram showing the relationship between the receiving member and the facing portion of the holder according to the modified example. Is. It is a schematic diagram which shows the relationship between the movable range example of the lever part which concerns on the said embodiment, and a receiving member. (A) and (b) are enlarged views showing the relationship between the receiving member and the insertion portion according to the same embodiment. It is an enlarged view around the end part of the groove part which concerns on the said embodiment.

An embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the position detection device 100 includes a lever portion 10 that rotates about the axis AX according to the movement of the target for position detection, a rotating body 20 that rotates together with the lever portion 10, and a magnetometer. It includes a sensor 30 and a support portion 40 that rotatably supports the rotating body 20. The position detection device 100 detects, for example, the position of an object to be exercised in the vehicle.

The support portion 40 rotatably supports the rotating body 20 around the axis AX, and mainly has a case 50 and a flat plate ring-shaped receiving member 60 as shown in FIG.

The case 50 is a PCB (Printed Circuit Board) on which a rotating body accommodating portion 51 for rotatably accommodating a rotating body 20 about an axis AX, an insertion portion 52 into which a receiving member 60 is inserted, and a magnetic sensor 30 are mounted. It has a substrate accommodating portion 53 accommodating 31 and a cord holding portion 54 holding a cord 32 connected to the PCB 31. The rotating body accommodating portion 51 is formed around the axis AX and has a bottomed hole that opens toward the left side in FIG. The rotating body 20 slides and rotates in the bottomed hole. The insertion portion 52 is located at the open end of the rotating body accommodating portion 51. The substrate accommodating portion 53 is formed on the back side of the inner bottom of the rotating body accommodating portion 51 and accommodates the PCB 31. The PCB 31 is fixed in the substrate accommodating portion 53 in a posture in which the normal of the main surface of the base material is parallel to the axis AX. The cord holding portion 54 is provided at a position farther from the axis line AX than the substrate accommodating portion 53, and holds the cord 32 via the grommet 33.

The receiving member 60 is a ring-shaped member inserted into the insertion portion 52, and receives the rotating body 20 (specifically, the holder 23 described later) in the direction along the axis AX. Further, the receiving member 60 pivotally supports the bush 22 described later in the opening thereof. For example, the receiving member 60 is made of a metal washer. As shown in FIG. 8, the receiving member 60 has a pair of flat surface portions 60a and 60b oriented in the radial direction (hereinafter, also simply referred to as “diameter direction”) about the axis AX. Each of the pair of flat surface portions 60a and 60b is a portion formed by chamfering a part of the outer peripheral surface of the receiving member 60. The insertion portion 52 of the case 50 has a hole into which the receiving member 60 is inserted in the direction along the axis AX. As shown in FIGS. 9A and 9B, contact flat surface portions 52a and 52b that come into contact with each of the pair of flat surface portions 60a and 60b are formed on the inner peripheral portion of the hole included in the insertion portion 52. .. That is, in the radial direction centered on the axis AX, the flat surface portion 60a and the contact flat surface portion 52a face each other, and the flat surface portion 60b and the contact flat surface portion 52b face each other. The flat surface portions 60a and 60b and the contact flat surface portions 52a and 52b can prevent the receiving member 60 from idling with respect to the insertion portion 52 of the case 50.

Here, as shown in FIG. 8, the movable range of the lever portion 10 is shown, and the central angle with respect to the axis AX is defined as the movable range angle R. In this case, it is preferable that the pair of flat surface portions 60a and 60b are provided in parallel with the bisector BX having a movable range angle R. By doing so, when a load is applied to the lever portion 10 at the movable range angle R, the load can be efficiently received and the idle rotation of the receiving member 60 can be prevented.

The magnetic sensor 30 shown in FIG. 2 is located so as to face the magnet 21 included in the rotating body 20 in the direction along the axis AX, and detects a change in the magnetic field accompanying the rotation of the rotating body 20. The magnetic sensor 30 includes, for example, a Hall IC (Integrated Circuit) including a Hall element, an operational amplifier, and the like. The magnetic sensor 30 outputs a voltage signal corresponding to the detected magnetic field (magnetic flux density) to the PCB 31. The magnetic sensor 30 may be another known sensor using an MR (Magneto Resistive Sensor) element or the like.

The PCB 31 mounts various electronic components such as a magnetic sensor 30 and a microcomputer (not shown). The microcomputer acquires a voltage signal from the magnetic sensor 30, calculates the position of the target by a known method based on the acquired voltage signal, and uses it as a detection result. Then, the PCB 31 transmits a detection signal indicating the detection result to a device (not shown) such as an instrument. In the device, the position of the target is notified.

As shown in FIGS. 2 and 6, the rotating body 20 includes a magnet 21, a bush 22, and a holder 23 for holding the magnet 21 and the bush 22.

The magnet 21 is formed in a disk shape from a known material such as neodymium or ferrite, and changes the magnetic field to the magnetic sensor 30 as the rotating body 20 rotates. The bush 22 has a cylindrical shape centered on the axis AX. A pin 12 described later of the lever portion 10 is press-fitted into the bush 22. The holder 23 is made of resin and has a cylindrical shape along the axis AX. The holder 23 holds the magnet 21 at one open end along the axis AX and holds the bush 22 at the other open end. For example, the magnet 21 and the bush 22 are integrally formed with the holder 23 by insert molding. A ring-shaped sealing member 23s is fitted in the outer peripheral portion of the holder 23. The seal member 23s comes into contact with the inner peripheral surface of the rotating body accommodating portion 51 to suppress the ingress of water or the like.

The holder 23 has an opposing portion 230 facing the receiving member 60 in the direction along the axis AX. The facing portion 230 is located on the outer peripheral side of the bush 22, and has a facing surface 231 facing the receiving surface 61, which is a surface of the receiving member 60 facing the rotating body 20, as shown in FIG. The receiving surface 61 is a plane orthogonal to the axis AX. The facing surface 231 is formed so as to be inclined away from the receiving member 60 (specifically, the receiving surface 61) as the distance from the axis AX increases.

On the facing surface 231, when a force F (see FIG. 2) along the axis AX is applied to the tip of the lever portion 10 and the rotating body 20 is tilted from the axis AX and comes into contact with the receiving member 60, the rotating body 20 and the receiving member 20 The stresses generated at each other in 60 are inclined so as to be effectively dispersible. In order to realize this, the inclination angle θ of the facing surface 231 with respect to the receiving surface 61 was calculated by the formula of θ = arcsin (r / h) [rad] = arcsin (r / h) × 180 / π [deg]. Values can be applied. Here, r is the maximum radial backlash when the rotating body 20 is moved to one side with respect to the rotating body accommodating portion 51 (that is, the clearance when the rotating body 20 is moved to one of the radial directions about the axis AX). ). Further, h is the height (length along the axis AX) of the holder 23 of the rotating body 20. In this calculation formula, as shown in a schematic diagram in FIG. 7A, when the holder 23 is most tilted with respect to the rotating body accommodating portion 51 with respect to the axis AX, the facing surface 231 is parallel to the receiving surface 61. It can be derived in consideration of the fact that.

As a modification, as shown in FIG. 7B, the facing surface 231 of the holder 23 is a plane orthogonal to the axis AX, and the receiving surface 61 of the receiving member 60 is moved away from the axis AX to be the holder 23 (specifically). It may be formed so as to be inclined away from the facing surface 231). The inclination angle θ of the receiving surface 61 with respect to the facing surface 231 in this case was also calculated by the formula of θ = arcsin (r / h) × 180 / π [deg] in the same way as in the case of FIG. 7 (a). Values can be applied.

As shown in FIGS. 1 to 4, the lever portion 10 includes a lever main body 11, a pin 12, and a mounted portion 13.

The lever body 11 is made of resin and has a first plate portion 111, a second plate portion 112, and a tapered portion 113. Each of these portions is located along the radial direction centered on the axis AX in the order of the first plate portion 111, the taper portion 113, and the second plate portion 112 from the side closer to the axis AX.

The first plate portion 111 has a cylindrical shape extending along the axis AX. The thickness of the first plate portion 111 in the direction along the axis AX is formed to be thicker than the thickness of the second plate portion 112 in the same direction. For example, the first plate portion 111 is formed to have a thickness of about 1.5 to 2 times that of the second plate portion 112. A pin 12 is fixed inside the cylindrical first plate portion 111.

The pin 12 has a columnar shape extending along the axis AX. For example, the lever body 11 and the pin 12 are integrally formed by insert molding. The pin 12 is fixed to the rotating body 20 by pressing a portion protruding toward the rotating body 20 into the bush 22. As a result, the rotating body 20 rotates about the axis AX together with the lever portion 10.

The tapered portion 113 extends in the radial direction about the axis AX and is provided between the first plate portion 111 and the second plate portion 112. The tapered portion 113 has an inclined surface 113f that connects the surface of the first plate portion 111 (the left surface of FIG. 2) and the surface of the second plate portion 112 (the left surface of FIG. 1). The back surface 113b of the inclined surface 113f of the tapered portion 113 is orthogonal to the axis AX and is formed in the same plane as the back surfaces (the right surface in FIG. 2) of the first plate portion 111 and the second plate portion 112. The inclined surface 113f is inclined so that the thickness of the tapered portion 113 along the axis AX gradually tapers (thin wall) from the first plate portion 111 to the second plate portion 112. Further, the tapered portion 113 has a shape in which the width thereof gradually narrows from the first plate portion 111 to the second plate portion 112 in the plan view of FIG.

As shown in FIG. 3, groove portions 70, 71, 72 along the radial direction centered on the axis AX are formed on the inclined surface 113f side of the tapered portion 113. As shown in the cross section in FIG. 5, the groove portions 70, 71, 72 are recessed from the inclined surface 113f toward the back surface 113b. The groove portion 70 is located at the center of the tapered portion 113 in the width direction W, and the groove portions 71 and 72 are located on the left and right sides of the groove portion 70. The depths of the groove portions 70, 71, 72 and the groove portion 73, which will be described later, are set to be constant. That is, as shown in FIG. 2, the inclined surface 113f of the tapered portion 113 and the bottom surface 70a of the groove portion 70 are set in parallel. As a result, the cross-sectional shape of the tapered portion 113 along the groove portion 70 also becomes a tapered shape that becomes thinner as the distance from the axis AX increases. The bottom surfaces of the grooves 71 and 72 are also parallel to the inclined surface 113f. Further, the groove portion 70 is formed to have a substantially constant width. On the other hand, the groove portions 71 and 72 located across the groove portion 70 are formed in a shape in which the width becomes narrower as the width increases from the axis AX. Further, as shown in FIG. 1, the radial outer peripheral end portions of the groove portions 70, 71, 72 form a semicircular arc shape.

As shown enlarged in FIG. 10, the tip 70b of the groove 70 near the axis AX has an isosceles triangle shape with a rounded tip. The tip portion 70b includes inclined wall surfaces 70c and 70d whose distances become closer to each other as they approach the tip end side of the groove portion 70, and a semicircular arc wall surface 70e connecting the tip portions of the inclined wall surfaces 70c and 70d. The angle α formed by the side wall surface 70s of the groove 70 and the inclined wall surfaces 70c and 70d is set to an obtuse angle. For example, the angle α is set to 150 ° to 170 °. As described above, since the acute-angled portion is not formed on the tip portion 70b, stress concentration is suppressed.

As shown in FIG. 1, a groove portion 73 is formed on the front side of the first plate portion 111 of the lever portion 10. The groove portion 73 has a semicircular shape along the outer circumference of the pin 12 so as to connect the ends of the groove portions 71 and 72 near the pin 12. The groove portions 71, 72, 73 form a series of U-shaped grooves in a plan view.

As shown in FIG. 4, groove portions 80, 81, 82 along the radial direction centered on the axis AX are formed on the back surface 113b side of the tapered portion 113. As shown in the cross section in FIG. 5, the groove portions 80, 81, 82 are recessed from the back surface 113b toward the inclined surface 113f. Further, as shown in FIG. 2, a groove portion 83 is formed on the back side of the first plate portion 111 of the lever portion 10. The groove portions 80, 81, 82, 83 have the same shape as the groove portions 70, 71, 72, 73 formed on the front side of the lever portion 10. The groove portions 80, 81, 82, 83 are located on the back side of the lever portion 10 corresponding to each of the groove portions 70, 71, 72, 73. The groove portions 70 to 73 and the groove portions 80 to 83 are provided in order to reduce the weight of the lever portion 10 while maintaining the strength of the lever portion 10. The groove portions 71, 72, 73 described above (the same applies to the groove portions 81 to 83 on the back side of the lever portion 10) form a series of U-shaped grooves. Therefore, the distance between the grooves can be increased, and the weight of the lever portion 10 can be further reduced. Further, the groove portions 73 and 83 are located on the base end side of the lever portion 10. As shown in FIG. 2, even when a force F along the axis AX is applied to the tip end side of the lever portion 10, stress is hard to concentrate on the base end side. With such groove portions 73 and 83, it is possible to reduce the weight while avoiding a decrease in the strength of the lever portion 10.

The second plate portion 112 has a cylindrical shape along the axis AX. The attached portion 13 is fixed inside the cylindrical second plate portion 112. The attached portion 13 is formed of, for example, a ring shape made of metal. A link mechanism (not shown) for connecting the detection target of the position detection device 100 to the lever portion 10 is attached to the attached portion 13.

The detection operation of the position detection device 100 having the above configuration will be described. The lever portion 10 and the rotating body 20 rotate about the axis AX according to the linear motion, the curved motion, or the rotary motion of the detection target. The magnetic sensor 30 detects a change in the magnetic field accompanying the rotation of the rotating body 20 having the magnet 21, and outputs a voltage signal corresponding to the change in the magnetic field to the PCB 31. The PCB 31 detects the position of the target based on the acquired voltage signal, and outputs a detection signal indicating the detection result to the outside via the code 32.

(1) The position detecting device 100 described above includes a lever portion 10, a rotating body 20 that rotates around the axis AX together with the lever portion 10, and a detecting unit (for example, a magnetic sensor 30) that detects the rotation of the rotating body 20. , Corresponds to PCB31.) The lever portion 10 is located farther from the axis AX than the first plate portion 111 and the first plate portion 111, and is thinner than the first plate portion 111 and has a diameter centered on the axis AX. A tapered portion 113 extending in the direction and connecting the first plate portion 111 and the second plate portion 112 is provided. The tapered portion 113 has an inclined surface 113f connecting the surface of the first plate portion 111 and the surface of the second plate portion 112, and the tapered portion 113 is recessed from the inclined surface 113f and has grooves 70, 71 in the radial direction. 72 is formed.
According to this configuration, as shown in FIG. 2, even when a force F along the axis AX is applied to the tip of the lever portion 10, the first plate portion 111 located around the axis AX is the second plate portion. Since it is formed thicker than 112, the strength of the lever portion 10 can be ensured. Further, the tapered portion 113 can prevent the formation of a step in which stress is likely to be concentrated between the first plate portion 111 and the second plate portion 112. Further, the groove portions 70, 71, 72 reduce the weight of the lever portion 10, and the cross-sectional shape of the tapered portion 113 along the groove portions 70, 71, 72 is also tapered, so that stress concentration can be avoided. ..

(2) Further, the position detection device 100 includes a support portion 40 that rotatably supports the rotating body 20. The support portion 40 has a receiving member 60 that receives the rotating body 20 in the direction along the axis AX. The rotating body 20 has a facing surface 231 facing the receiving member 60, and the facing surface 231 inclines away from the receiving member 60 as the distance from the axis AX increases.
According to this configuration, as described above, the stress generated between the rotating body 20 and the receiving member 60 can be effectively dispersed.

(3) In the position detecting device 100, as in the modified example described with reference to FIG. 7B, the receiving member 60 has a receiving surface 61 facing the rotating body 20, and the receiving surface 61 has a receiving surface 61. , A configuration may be adopted in which the rotating body 20 is inclined away from the rotating body 20 as the distance from the axis AX increases.
With this configuration as well, as described above, the stress generated between the rotating body 20 and the receiving member 60 can be effectively dispersed.

(4) Further, the support portion 40 has a case 50 for accommodating the rotating body 20, and the receiving member 60 has a ring shape centered on the axis AX and has a pair of flat surface portions 60a and 60b facing in the radial direction. Have. Each of the pair of flat surface portions 60a and 60b is formed by chamfering the outer peripheral surface of the receiving member 60. The case 50 has an insertion portion 52 into which the receiving member 60 is inserted, and the insertion portion 52 has contact plane portions 52a and 52b that come into contact with each of the pair of plane portions 60a and 60b.
According to this configuration, as described above, it is possible to prevent the receiving member 60 from idling with respect to the insertion portion 52.

(5) The pair of flat surface portions 60a and 60b are preferably provided in parallel with the bisector BX having a movable range angle R.
By doing so, when a load is applied to the lever portion 10 at the movable range angle R, the load can be efficiently received and the idle rotation of the receiving member 60 can be prevented.

(6) Further, it is preferable that the inclined surface 113f and the bottom surfaces of the grooves 70, 71, 72 are parallel to each other.
By doing so, the cross-sectional shape of the lever portion 10 along the groove portions 70, 71, 72 can be made into a tapered shape having a tapered thickness similar to the side surface shape of the lever portion 10, so that stress concentration is suppressed. be able to.

(7) The position detection device 100 described above is suitable for a configuration in which the rotating body 20 has a magnet 21 and the detection unit has a magnetic sensor 30.

The present invention is not limited to the above embodiments and drawings. Changes (including deletion of components) can be made as appropriate without changing the gist of the present invention.

The number and arrangement of the grooves of the lever portion 10 can be changed. For example, it is not necessary to provide a groove on the back side of the lever portion 10. Further, only one groove portion formed on the front side of the lever portion 10 and along the radial direction may be provided, or a plurality of groove portions may be provided.

The position detection device 100 is not limited to the magnetic type, and may detect the rotation of the rotating body 20 by a known method such as an optical type, a capacitance type, or a contact type.

In the above description, in order to facilitate the understanding of the present invention, the description of known technical matters has been omitted as appropriate.

100 ... Position detection device 10 ... Lever part 11 ... Lever body, 12 ... Pin, 13 ... Attached part 111 ... First plate part, 112 ... Second plate part 113 ... Tapered part, 113f ... Inclined surface, 113b ... Back side 20 ... Rotating body 21 ... Magnet 22 ... Bush 23 ... Holder, 230 ... Opposing part, 231 ... Facing surface 30 ... Magnetic sensor, 31 ... PCB
40 ... Support part 50 ... Case 52 ... Insertion part, 52a, 52b ... Contact flat part 60 ... Receiving member, 60a, 60b ... Flat part, 61 ... Receiving surface 70, 71, 72, 73 ... Groove part, 70a ... Bottom surface 80, 81, 82, 83 ... Groove, 80a ... Bottom surface AX ... Axis R ... Movable range angle, BX ... Bisection line

Claims (7)

A lever that rotates around the axis according to the movement of the target for position detection,
A rotating body that rotates around the axis together with the lever portion,
A detection unit for detecting the rotation of the rotating body is provided.
The lever portion is located at a distance from the axis of the first plate portion and the first plate portion, and is thinner than the first plate portion in the radial direction around the axis. A tapered portion that extends and connects the first plate portion and the second plate portion is provided.
The tapered portion has an inclined surface connecting the surface of the first plate portion and the surface of the second plate portion.
The tapered portion is recessed from the inclined surface and has a groove portion along the radial direction.
Position detector. A support portion that rotatably supports the rotating body is provided.
The support portion has a receiving member that receives the rotating body in a direction along the axis.
The rotating body has a facing surface facing the receiving member, and has a facing surface.
The facing surface inclines away from the receiving member as it moves away from the axis.
The position detecting device according to claim 1. A support portion that rotatably supports the rotating body is provided.
The support portion has a receiving member that receives the rotating body in a direction along the axis.
The receiving member has a receiving surface facing the rotating body and has a receiving surface.
The receiving surface inclines away from the rotating body as it moves away from the axis.
The position detecting device according to claim 1. The support portion has a case for accommodating the rotating body.
The receiving member has a ring shape centered on the axis and has a pair of flat surfaces facing in the radial direction.
Each of the pair of flat surfaces is formed by chamfering the outer peripheral surface of the receiving member.
The case has an insertion portion into which the receiving member is inserted.
The insertion portion has a contact flat surface portion that comes into contact with each of the pair of flat surface portions.
The position detecting device according to claim 2 or 3. When the movable range of the lever portion is shown and the central angle with respect to the axis is taken as the movable range angle,
The pair of flat surfaces are provided parallel to the bisector of the movable range angle.
The position detecting device according to claim 4. The inclined surface and the bottom surface of the groove are parallel to each other.
The position detecting device according to any one of claims 1 to 5. The rotating body has a magnet and
The detection unit has a magnetic sensor.
The position detecting device according to any one of claims 1 to 6.

Images