JP7424184B2 - position detection device - Google Patents

Description

The present invention relates to a position detection 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. Thereby, rotation of the lever element is detected by the sensor element.

US Patent Application Publication No. 2017/0276511

In the configuration of Patent Document 1, the lever element is formed into a flat plate shape extending in a direction perpendicular to the rotation center axis thereof. For this reason, if a force in a direction along the rotational center axis is applied to the end of the lever element far from the rotational center axis, there is a possibility that stress will be concentrated in the peripheral portion of the rotational 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 detection device that can suppress stress concentration.

In order to achieve the above object, a position detection device according to a first aspect of the present invention includes:
A lever part that rotates around an axis in accordance with the movement of the object of position detection;
a rotating body that rotates about the axis together with the lever part;
a detection unit that detects rotation of the rotating body;
A support part that rotatably supports the rotating body,
The lever portion includes a first plate portion, a second plate portion located farther from the axis than the first plate portion, and thinner than the first plate portion, and a second plate portion that extends in a radial direction about the axis. a tapered part extending and connecting the first plate part and the second plate part,
The tapered portion has an inclined surface connecting the surface of the first plate portion and the surface of the second plate portion,
A groove portion recessed from the inclined surface and extending in the radial direction is formed in the tapered portion ,
The support part 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,
The opposing surface slopes away from the receiving member as it moves away from the axis.
Further, the position detection device according to the second aspect of the present invention includes:
A lever part that rotates around an axis in accordance with the movement of the object of position detection;
a rotating body that rotates about the axis together with the lever part;
a detection unit that detects rotation of the rotating body;
A support part that rotatably supports the rotating body,
The lever portion includes a first plate portion, a second plate portion located farther from the axis than the first plate portion, and thinner than the first plate portion, and a second plate portion that extends in a radial direction about the axis. a tapered part extending and connecting the first plate part and the second plate part,
The tapered portion has an inclined surface connecting the surface of the first plate portion and the surface of the second plate portion,
A groove portion recessed from the inclined surface and extending in the radial direction is formed in the tapered portion,
The support part 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,
The receiving surface slopes away from the rotating body as it moves away from the axis.

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

FIG. 1 is a plan view of a position detection device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA shown in FIG. 1 of the position detection device according to the embodiment same as above. It is a perspective view of the position detection device concerning an embodiment same as the above. It is a perspective view of the position detection device concerning an embodiment same as the above. FIG. 2 is a cross-sectional view taken along line BB shown in FIG. 1 of the tapered portion according to the embodiment same as the above. FIG. 2 is an enlarged cross-sectional view of a main part of the position detection device according to the embodiment. (a) is a schematic diagram showing the relationship between the receiving member and the facing part of the holder according to the embodiment, and (b) is a schematic diagram showing the relationship between the receiving member and the facing part of the holder according to a modified example. It is. It is a schematic diagram which shows the relationship between the example of the movable range of a lever part, and a receiving member based on embodiment same as the above. (a) and (b) are enlarged views showing the relationship between the receiving member and the insertion portion according to the embodiment. It is an enlarged view of the edge part periphery of the groove part based on embodiment same as the above.

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

As shown in FIGS. 1, 2, etc., the position detection device 100 includes a lever section 10 that rotates around an axis AX according to the movement of the object of position detection, a rotating body 20 that rotates together with the lever section 10, and a magnetic It includes a sensor 30 and a support section 40 that rotatably supports the rotating body 20. The position detection device 100 detects, for example, the position of a moving object within a vehicle.

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

The case 50 includes a rotating body housing part 51 that rotatably houses the rotating body 20 around the axis AX, an insertion part 52 into which the receiving member 60 is inserted, and a PCB (Printed Circuit Board) on which the magnetic sensor 30 is mounted. 31, and a cord holding portion 54 that holds the cord 32 connected to the PCB 31. The rotating body accommodating portion 51 has a bottomed hole that is formed around the axis AX and opens toward the left in FIG. 2 . The rotating body 20 slides and rotates within this bottomed hole. The insertion portion 52 is located at the open end of the rotating body housing portion 51 . The board accommodating part 53 is formed on the back side of the inner bottom of the rotating body accommodating part 51, and accommodates the PCB 31. The PCB 31 is fixed in the board accommodating portion 53 in a posture in which the normal line of the main surface of the base material is parallel to the axis AX. The cord holding section 54 is provided at a position farther from the axis AX than the board accommodating section 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 below) in the direction along the axis AX. Further, the receiving member 60 pivotally supports a bush 22, which will be described later, within its opening. 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 portions 60a and 60b oriented in a radial direction (hereinafter also simply referred to as "radial direction") centered on the axis AX. Each of the pair of plane parts 60a and 60b is a part 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. 9(a) and 9(b), contact plane parts 52a and 52b are formed in the inner circumferential part of the hole of the insertion part 52, which contact each of the pair of plane parts 60a and 60b. . That is, in the radial direction centered on the axis AX, the plane portion 60a and the contact plane portion 52a are opposed to each other, and the plane portion 60b and the contact plane portion 52b are opposed to each other. The flat portions 60a, 60b and the contact flat portions 52a, 52b can prevent the receiving member 60 from rotating idly 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 plane parts 60a and 60b be provided parallel to the bisector BX of the movable range angle R. In this way, when a load is applied to the lever portion 10 in the movable range angle R, the load can be efficiently received and the receiving member 60 can be prevented from spinning idly.

The magnetic sensor 30 shown in FIG. 2 is located facing the magnet 21 of the rotating body 20 in the direction along the axis AX, and detects changes in the magnetic field accompanying the rotation of the rotating body 20. The magnetic sensor 30 is composed of a Hall IC (Integrated Circuit) including, for example, a Hall element, an operational amplifier, and the like. The magnetic sensor 30 outputs a voltage signal to the PCB 31 according to the detected magnetic field (magnetic flux density). Note that 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 object by a known method based on the acquired voltage signal, and uses the result as a detection result. Then, the PCB 31 transmits a detection signal indicating the detection result to a device (not shown) such as a meter. In the device, the location of the target is reported.

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

The magnet 21 is formed into a disk shape from a known material such as neodymium or ferrite, and applies a change in 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 of the lever portion 10, which will be described later, 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 seal member 23s is fitted into the outer circumference of the holder 23. The sealing member 23s contacts the inner circumferential surface of the rotating body housing portion 51 and suppresses infiltration of water and the like.

The holder 23 has a facing portion 230 that faces the receiving member 60 in the direction along the axis AX. The opposing portion 230 is located on the outer peripheral side of the bush 22, and has an opposing surface 231 that faces the receiving surface 61, which is the 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 opposing surface 231 is formed to be inclined so as to be separated from the receiving member 60 (specifically, the receiving surface 61) as it moves away from the axis AX.

The opposing surface 231 is formed between the rotating body 20 and the receiving member when a force F along the axis AX (see FIG. 2) is applied to the tip of the lever portion 10 and the rotating body 20 is tilted from the axis AX and contacts the receiving member 60. 60 is sloped so that mutually occurring stress can be effectively dispersed. In order to achieve this, the inclination angle θ of the opposing surface 231 with respect to the receiving surface 61 was calculated using the formula: θ = arcsin (r/h) [rad] = arcsin (r/h) x 180/π [deg] value can be applied. Here, r is the maximum radial play when the rotating body 20 is moved to one side with respect to the rotating body housing portion 51 (that is, the clearance when the rotating body 20 is moved to one side in the radial direction around the axis AX) ). Further, h is the height (length along the axis AX) of the holder 23 of the rotating body 20. As shown in a schematic diagram in FIG. 7(a), this calculation formula is based on the calculation formula that when the holder 23 is most inclined with respect to the axis AX with respect to the rotating body housing portion 51, the opposing surface 231 is parallel to the receiving surface 61. It can be derived by considering that.

As a modification example, as shown in FIG. 7B, the opposing surface 231 of the holder 23 is made into a plane orthogonal to the axis AX, and the receiving surface 61 of the receiving member 60 is arranged so that the holder 23 (specifically Specifically, it may be formed to be inclined away from the opposing surface 231). The inclination angle θ of the receiving surface 61 with respect to the opposing surface 231 in this case was also calculated using the formula θ=arcsin(r/h)×180/π [deg] using the same concept as in the case of FIG. 7(a). value can be applied.

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

The lever body 11 is made of resin and includes a first plate portion 111, a second plate portion 112, and a tapered portion 113. These parts are located along the radial direction centered on the axis AX in the order of the first plate part 111, the tapered part 113, and the second plate part 112 from the one closest to the axis AX.

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

The pin 12 has a cylindrical 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 having a portion protruding toward the rotating body 20 press-fitted into the bushing 22 . As a result, the rotating body 20 rotates together with the lever portion 10 about the axis AX.

The tapered portion 113 extends in a radial direction centered on 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 side surface in FIG. 2) and the surface of the second plate portion 112 (the left side surface in FIG. 1). The back surface 113b of the inclined surface 113f of the tapered portion 113 is perpendicular to the axis AX, and is formed on the same plane as the back surfaces of the first plate portion 111 and the second plate portion 112 (the right side surface in FIG. 2). The inclined surface 113f is inclined so that the thickness of the tapered portion 113 along the axis AX gradually tapers (thinner) from the first plate portion 111 toward 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 toward the second plate portion 112 in a plan view of FIG.

As shown in FIG. 3, groove portions 70, 71, and 72 are formed on the inclined surface 113f side of the tapered portion 113 along the radial direction centered on the axis AX. As shown in cross section in FIG. 5, the grooves 70, 71, and 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 with the groove portion 70 interposed therebetween. The depths of the grooves 70, 71, 72 and a groove 73, which will be described later, are set 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 parallel to each other. As a result, the cross-sectional shape of the tapered portion 113 along the groove portion 70 also becomes tapered so that the thickness becomes thinner as the distance from the axis AX increases. Note that 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 on both sides of the groove portion 70 are formed in such a shape that the width becomes narrower as the distance from the axis AX increases. Moreover, as shown in FIG. 1, the outer peripheral side ends of the grooves 70, 71, and 72 in the radial direction form a semicircular arc shape.

As shown in an enlarged view in FIG. 10, the tip 70b of the groove 70 close to the axis AX has an isosceles triangular shape with a rounded tip. The distal end portion 70b includes inclined wall surfaces 70c and 70d that become closer to each other as they approach the distal end side of the groove portion 70, and a semicircular arcuate wall surface 70e that connects the distal ends of the inclined wall surfaces 70c and 70d. The angle α formed by the side wall surface 70s of the groove portion 70 and the inclined wall surfaces 70c and 70d is set to be an obtuse angle. For example, the angle α is set between 150° and 170°. In this way, since no acute angle portion is formed in 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. As shown in FIG. The groove 73 has a semicircular arc shape along the outer periphery of the pin 12 so as to connect the ends of the grooves 71 and 72 near the pin 12. The groove portions 71, 72, and 73 form a series of U-shaped grooves in plan view.

As shown in FIG. 4, grooves 80, 81, and 82 are formed on the back surface 113b side of the tapered portion 113 along a radial direction centered on the axis AX. As shown in cross section in FIG. 5, the grooves 80, 81, and 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 grooves 80, 81, 82, 83 have the same shape as the grooves 70, 71, 72, 73 formed on the front side of the lever part 10. Grooves 80, 81, 82, and 83 are located on the back side of lever portion 10, corresponding to grooves 70, 71, 72, and 73, respectively. The grooves 70 to 73 and the grooves 80 to 83 are provided to reduce the weight of the lever part 10 while maintaining its strength. The grooves 71, 72, and 73 described above (the same applies to the grooves 81 to 83 on the back side of the lever part 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 proximal end side of the lever portion 10. Even when a force F along the axis AX is applied to the distal end side of the lever portion 10 as shown in FIG. 2, stress is difficult to concentrate on the proximal end side. With such grooves 73 and 83, it is possible to reduce the weight of the lever part 10 while avoiding a decrease in its strength.

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 made of metal and has a ring shape, for example. 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 explained. The lever portion 10 and the rotating body 20 rotate around the axis AX in accordance with the linear motion, curved motion, or rotational motion of the detection target. The magnetic sensor 30 detects a change in the magnetic field due to the rotation of the rotating body 20 having the magnet 21, and outputs a voltage signal to the PCB 31 according to the change in the magnetic field. 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 cord 32.

(1) The position detection device 100 described above includes a lever section 10, a rotating body 20 that rotates around the axis AX together with the lever section 10, and a detection section (for example, a magnetic sensor 30) that detects the rotation of the rotating body 20. , corresponding to PCB31). The lever part 10 includes a first plate part 111, a second plate part 112 that is located farther from the axis AX than the first plate part 111, and has a thinner thickness than the first plate part 111, and a diameter centering on the axis AX. The tapered portion 113 extends in the direction and connects 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 and the surface of the second plate portion 112. 72 is formed.
According to this configuration, even when a force F along the axis AX is applied to the tip end of the lever part 10, as shown in FIG. Since the lever portion 112 is formed thicker than the lever portion 112, the strength of the lever portion 10 can be ensured. Furthermore, the tapered portion 113 can suppress the formation of a step between the first plate portion 111 and the second plate portion 112 where stress tends to concentrate. Furthermore, while the grooves 70, 71, 72 reduce the weight of the lever part 10, the cross-sectional shape of the tapered part 113 along the grooves 70, 71, 72 is also tapered, so stress concentration can be avoided. .

(2) The position detection device 100 also includes a support portion 40 that rotatably supports the rotating body 20. The support portion 40 includes a receiving member 60 that receives the rotating body 20 in a direction along the axis AX. The rotating body 20 has an opposing surface 231 that faces the receiving member 60, and the opposing surface 231 slopes away from the receiving member 60 as it moves away from the axis AX.
According to this configuration, as described above, the stress mutually generated in the rotating body 20 and the receiving member 60 can be effectively dispersed.

(3) In the position detection device 100, as in the modification described with reference to FIG. 7(b), the receiving member 60 has a receiving surface 61 facing the rotating body 20, , a configuration may be adopted in which the rotation body 20 is tilted away from the rotating body 20 as the distance from the axis AX increases.
Also with this configuration, as described above, the stress mutually generated in the rotating body 20 and the receiving member 60 can be effectively dispersed.

(4) Further, the support part 40 has a case 50 that accommodates the rotating body 20, and the receiving member 60 has a ring shape centered on the axis AX and has a pair of flat parts 60a and 60b facing in the radial direction. have Each of the pair of plane parts 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 flat portions 52a and 52b that contact each of the pair of flat portions 60a and 60b.
According to this configuration, as described above, it is possible to prevent the receiving member 60 from rotating idly with respect to the insertion portion 52.

(5) It is preferable that the pair of plane parts 60a and 60b are provided parallel to the bisector BX of the movable range angle R.
In this way, when a load is applied to the lever portion 10 in the movable range angle R, the load can be efficiently received and the receiving member 60 can be prevented from spinning idly.

(6) Furthermore, it is preferable that the inclined surface 113f and the bottom surfaces of the grooves 70, 71, and 72 are parallel to each other.
In this way, the cross-sectional shape along the grooves 70, 71, 72 of the lever part 10 can be made into a tapered shape with a tapered thickness, similar to the side shape of the lever part 10, so that stress concentration can be suppressed. be able to.

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

Note that the present invention is not limited to the above embodiments and drawings. It is possible to make changes (including deletion of constituent elements) as appropriate without changing the gist of the present invention.

The number and arrangement of the grooves in the lever section 10 can be changed. For example, the groove portion may not be provided on the back side of the lever portion 10. Further, the number of grooves formed on the front side of the lever portion 10 and extending in the radial direction may be one or more.

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

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

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

Claims (6)

A lever part that rotates around an axis in accordance with the movement of the object of position detection;
a rotating body that rotates about the axis together with the lever part;
a detection unit that detects rotation of the rotating body;
A support part that rotatably supports the rotating body,
The lever portion includes a first plate portion, a second plate portion located farther from the axis than the first plate portion, and thinner than the first plate portion, and a second plate portion that extends in a radial direction about the axis. a tapered part extending and connecting the first plate part and the second plate part,
The tapered portion has an inclined surface connecting the surface of the first plate portion and the surface of the second plate portion,
A groove portion recessed from the inclined surface and extending in the radial direction is formed in the tapered portion ,
The support part 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,
The opposing surface slopes away from the receiving member as it moves away from the axis.
Position detection device. A lever part that rotates around an axis in accordance with the movement of the object of position detection;
a rotating body that rotates about the axis together with the lever part;
a detection unit that detects rotation of the rotating body;
A support part that rotatably supports the rotating body,
The lever portion includes a first plate portion, a second plate portion located farther from the axis than the first plate portion, and thinner than the first plate portion, and a second plate portion that extends in a radial direction about the axis. a tapered part extending and connecting the first plate part and the second plate part,
The tapered portion has an inclined surface connecting the surface of the first plate portion and the surface of the second plate portion,
A groove portion recessed from the inclined surface and extending in the radial direction is formed in the tapered portion,
The support part 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,
The receiving surface slopes away from the rotating body as it moves away from the axis.
Position detection device. The support section has a case that accommodates the rotating body,
The receiving member has a ring shape centered on the axis and has a pair of flat portions facing in the radial direction,
Each of the pair of plane parts is formed by chamfering the outer peripheral surface of the receiving member,
The case has an insertion part into which the receiving member is inserted,
The insertion part has a contact plane part that contacts each of the pair of plane parts,
The position detection device according to claim 1 or 2 . If the movable range of the lever part is shown and the central angle with respect to the axis is the movable range angle,
The pair of plane parts are provided parallel to the bisector of the movable range angle,
The position detection device according to claim 3 . the inclined surface and the bottom surface of the groove are parallel;
The position detection device according to any one of claims 1 to 4 . The rotating body has a magnet,
The detection unit includes a magnetic sensor.
The position detection device according to any one of claims 1 to 5 .

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