JP2012137353A - Position detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position detection device in which processing and product inspection of a change part of a body to be detected where a plate thickness gradually changes can be easily performed.SOLUTION: A position detection device 1 comprises: a magnet 4a which rotates based on rotation operation of a handle grip 3 provided to a handle bar 2; and magnetic detection means 5 for detecting rotation of the magnet 4a. The magnet 4a includes a plate-like part having curve surfaces on an outer surface 4b and an inner surface 4c of the plate-like part. At least a part of shapes of the outer surface 4b and the inner surface 4c has a circular cross-sectional shape in a direction vertical to a rotation axis direction of the magnet 4a. When a center of the circular shape of the outer surface 4b is a first center 4d and a center of the circular shape of the inner surface 4c is a second center 4e, positions of the first center 4d and the second center 4e are different. And the plate-like part of the magnet 4a includes a thick part 4f and a thin part 4g.

Description

  The present invention relates to a position detection device that detects an operation position of a handle grip or the like of a motorcycle.

  A conventional position detection device is disclosed in Patent Document 1 below, for example. The position detection device described in Patent Document 1 includes an accelerator and a casing that can be displaced relative to each other. A permanent magnet is disposed as a detected object in the accelerator, and the casing includes a permanent magnet. In the range where the magnetic flux density of the magnetic field monotonously changes, the linear Hall IC which is a magnetic detection means for detecting the change of the magnetic flux density is arranged.

JP 2006-112880 A

  However, in the conventional position detecting device, in order to change the characteristics of the permanent magnet, the permanent magnet is formed with an inclined surface or the like whose thickness becomes thinner toward the end face side.

  In the case where a portion where the thickness of the permanent magnet changes, such as the inclined surface, is formed so as to change gradually, it is not easy to process and inspect the product to form with uniform quality.

  Accordingly, the present invention focuses on the above-described problems, and an object thereof is to provide a position detection device capable of easily processing and inspecting a change portion where the plate thickness of the detected object gradually changes. It is what.

  The position detection device of the present invention is a position detection device comprising a magnet that rotates based on a rotation operation of a handle grip provided on a handle bar, and a magnetic detection means that detects rotation of the magnet. Is provided with a plate-like portion having curved surfaces on the outer surface and the inner surface, and at least a part of the shape of the outer surface and the inner surface is an arc-shaped cross section perpendicular to the rotation axis direction of the magnet, The center of the arc shape of the outer surface is the first center, the center of the arc shape of the inner surface is the second center, the first center and the second center are different positions, and the plate-like portion of the magnet Are provided with a thick part and a thin part.

  Moreover, the said magnet is made into the cylindrical shape provided with the said plate-shaped part.

  The magnetic detection means is provided in a cylinder of the magnet.

  In addition, the thick portion or the thin portion of the magnet is provided with a defining portion that determines the magnetization direction.

  Moreover, the said definition part consists of a notch part.

  Further, the defining portion is a projection portion.

  As described above, according to the present invention, it is possible to provide a position detection device capable of easily processing and inspecting a change portion in which the plate thickness of the detection object gradually changes.

The side view of the position detection apparatus of 1st Embodiment of this invention. Sectional drawing of the AA line in FIG. Sectional drawing of the BB line in FIG. Sectional drawing of the magnet of the embodiment. The perspective view of the magnet of the embodiment. Sectional drawing of the magnet of 2nd Embodiment of this invention.

  Hereinafter, based on the attached drawings, a first embodiment of the present invention will be described with reference to an example of a position detection device that detects an operation position (rotation angle) of a handle grip rotatably provided on a handlebar of a motorcycle. .

  A position detection device 1 according to the present invention is provided on a handlebar 2 of a two-wheeled vehicle, and includes a holding member 4 that rotates together with a handle grip 3 that is an operation means, and a detected portion 4 a that is fixed to the holding member 4. A magnet, a magnetic detection means 5 for detecting the magnet 4a, a support member 6 that supports the holding member 4 in a rotatable manner and fixes the magnetic detection means 5, a holding member 4, a magnet 4a, a magnetic detection means 5, and And a case 7 for housing the support member 6.

  The handle bar 2 is made of a metal such as iron or aluminum and has a cylindrical shape.

  The handle grip 3 includes a sleeve 3a and a grip portion 3b. The sleeve 3a has a cylindrical shape made of a synthetic resin and is rotatably disposed on the outer periphery of the handle bar 2. The sleeve 3a includes a flange 3c at the left end in FIG. The flange portion 3c has a disk shape and is provided on the outer periphery of the handle grip 3 without any breaks. A part of the edge is provided with a connecting portion 3 d that is connected to the holding member 4 and transmits the rotation of the handle grip 3.

  The grip portion 3b is a portion that is gripped by the driver, is made of an elastic member such as rubber, covers the outer periphery of the sleeve 3a seamlessly, and is firmly fixed to the sleeve 3a.

  The holding member 4 is made of synthetic resin, is annular, has a hole 41 through which the support member 6 passes, and is supported by the support member 6 so as to be rotatable. Further, the holding member 4 includes a receiving portion 42 formed of a recess into which the connecting portion 3d of the handle grip 3 is inserted. By inserting the connecting portion 3d of the handle grip 3 into the receiving portion 42, the rotation of the handle grip 3 is transmitted to the holding member 4, and the holding member 4 is rotated.

  In addition, the holding member 4 includes a storage recess 43 that stores a return spring 8 described later. The storage recess 43 includes a cylindrical first tube portion 44 that forms the hole 41, a cylindrical second tube portion 45 having a larger diameter than the first tube portion 44, and first and second portions. It is comprised by the connection part 46 which connects the cylinder parts 44 and 45 of this. The connecting portion 46 is connected on the right side of the first and second cylindrical portions 44 and 45 in FIG. 3, and the storage recess 43 is open on the left side in FIG. 3.

  The magnet 4a is made of a synthetic resin containing a magnetic material. In the present embodiment, the magnet 4a has a pair of magnetic poles and has a cylindrical shape including a plate-like portion. The magnet 4a is fixed to the holding member 4 by insert molding. In this embodiment, the magnet 4a is fixed to the left side of the second cylindrical portion 45 of the holding member 4 in FIG. The magnet 4a includes an outer surface 4b and an inner surface 4c.

  As for the shape of the outer surface 4b, the cross-sectional shape perpendicular to the rotation axis direction of the magnet 4a is a curved surface of a circle. The shape of the inner surface 4c is a shape in which a cross-sectional shape in a direction perpendicular to the rotation axis direction of the magnet 4a is a curved surface obtained by combining two arcs.

  There is one first center 4d, which is the center of the circle of the outer surface 4b, and the same position as the rotation center of the magnet 4a. That is, the cross-sectional shape of the outer surface 4b is a circle having a radius R1 centered on the first center 4d.

  Further, there are two second centers 4e, which are the center of the arc shape of the inner surface 4d, and are different from the rotation center of the magnet 4a. That is, it is a position different from the first center 4d. As shown in FIG. 4, the second center 4e located on the upper side of the first center 4d is the center of the arc of the upper inner surface 4c, and the second center located on the lower side of the first center 4d. 4e is the center of the arc of the lower inner surface 4c.

  In FIG. 4, the cross-sectional shape of the upper inner surface 4c is an arc having a radius R2 centered on the second center 4e, and the cross-sectional shape of the lower inner surface 4c is a radius R2 centered on the second center 4e. Arc.

  By making the first center 4d and the second center 4e different positions, the thick part 4f and the thin part 4g are provided on the plate-like part of the magnet 4a. The thick part 4f on the right side in FIG. 4 is an N pole, the thick part 4f on the left side in FIG. 4 is magnetized so as to be an S pole, and the thin part 4g is between the magnetic poles. A range of 45 ° before and after the rotation direction around the thin portion 4g (a range of 45 ° left and right in the rotation direction of the thin portion 4g in FIG. 4) is used as a detection range.

  In the present embodiment, the thick portion 4f of the magnet 4a is provided with a defining portion 4h that determines the magnetization direction of the magnet 4a. The defining portion 4h is a notch that is recessed at the end of the magnet 4a in the rotation axis direction. By the defining portion 4h, the magnet 4a is positioned on the magnetizing jig and magnetized. Further, it is possible to position the holding member 4 holding the magnet 4a by the defining portion 4h.

  The defining portion 4h does not need to be a notch and is not shown, but may be, for example, a protrusion protruding from the end of the magnet 4a in the rotation axis direction.

  The magnetic detection means 5 converts a change in magnetic flux density into an electric signal, and is a magnetic detection element such as a Hall element, for example. Two magnetism detecting means 5 are provided and are arranged in the cylinder of the magnet 4a to detect the position of the magnet 4a.

  The magnetic detection means 5 is surface-mounted on the circuit board 51. The circuit board 51 includes a conductive path (not shown) and an electronic component electrically connected to the conductive path on an insulating base material such as glass epoxy resin. Further, the circuit board 51 is electrically connected with a wiring 52 connected to an external circuit. The signal of the magnetic detection means 5 is output to an external circuit via the circuit board 51 and the wiring 52.

  The support member 6 is made of synthetic resin, has an annular shape, and includes a cylindrical tubular portion 62 having a hole 61 through which the handlebar 2 passes, and surrounds the outer periphery of the handlebar 2. The support member 6 is fixed to the handlebar 2 so as not to rotate by means not shown. Moreover, the supporting member 6 is supporting the holding member 4 by the cylindrical part 62 so that rotation is possible.

  The support member 6 includes a disc-shaped movement restricting portion 63 in the middle of the cylindrical portion 62 in FIG. The movement restricting portion 63 restricts the holding member 4 from moving leftward in FIG. 3 in the direction of the rotation axis of the handle grip 3.

  Further, the supporting member 6 has a retaining member 64 attached to the right side of the cylindrical portion 62 in FIG. The retaining member 64 prevents the holding member 4 from falling off the cylindrical portion 62 and restricts the holding member 4 from moving to the right in FIG. 3 in the rotation axis direction of the handle grip 3. To do.

  The support member 6 is provided with a storage portion 65 in which the detection body 5 and the circuit board 51 are disposed on the lower left side of the movement restricting portion 63. The storage portion 65 is formed of a recess that is open on the left side in FIG. 3, and the storage portion 65 includes a holding portion 66 that holds both ends of the circuit board 51. The holding portion 66 is constituted by a groove provided on the inner wall of the storage portion 65. Further, the inside of the storage section 65 is filled with a protective material 67 made of a hardened synthetic resin, and protects the magnetic detection means 5 and the circuit board 51 from moisture and dust.

  The case 7 is composed of first and second cases 71 and 72. Both the first and second cases 71 and 72 are made of synthetic resin and have a substantially semicircular cup shape. The first and second cases 71 and 72 are divided along the direction of the rotation center axis of the handle grip 3. The first and second cases 71 and 72 are fixed by appropriate means such as welding.

  The case 7 houses the holding member 4, the magnet 4 a, the magnetic detection means 5, and the support member 6. The case 7 includes a pin 73. The pin 73 is inserted into a through hole 2 a provided in the handle bar 2 and fixes the case 7 so as not to move with respect to the handle bar 2.

  Reference numeral 74 denotes a packing through which the wiring 52 of the magnetic detection means 5 penetrates and prevents water and dust from entering the case 7 from the wiring 52.

  Reference numeral 8 denotes a return spring made up of a coil spring, which returns the handlebar grip 3 operated by the driver to the initial position. One end of the return spring 8 is fixed to the connecting portion 46 of the holding member 4, and the other end is fixed to the movement restricting portion 63 of the support member 6.

  By configuring as described above, it is possible to easily process a changing portion in which the plate thickness of the magnet 4 that is a detection object gradually changes, and to perform a product inspection. Further, in the product inspection, the inspection jig to be used can be easily and accurately manufactured because the shape of the inspection object is an arc.

  Further, since the magnet 4a has a cylindrical shape, the structural rigidity of the magnet 4a is improved, and the magnet 4a can be prevented from being damaged.

  Further, by providing the magnetic detection means 5 in the cylinder of the magnet 4a, the magnetic detection means 5 is less susceptible to the influence of the magnetic field outside the position detection device 1, and the detection accuracy of the magnetic detection means 5 by the external magnetic field is improved. It becomes possible to suppress the influence of.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  The second embodiment differs from the first embodiment in the shape of the magnet 14a.

  The shape of the outer surface 14b of the magnet 14a of this embodiment is a shape in which the cross-sectional shape in the direction perpendicular to the rotation axis direction of the magnet 14a has a curved surface formed by combining two arcs. In addition, the inner surface 14c has a circular curved surface with a cross-sectional shape perpendicular to the rotation axis direction of the magnet 14a.

  There are two first centers 14d, which are the center of the arc shape of the outer surface 14b, and are different from the rotation center of the magnet 14a.

  Further, the second center 14e, which is the center of the arc shape of the inner surface 14d, is one and is at the same position as the rotation center of the magnet 14a. That is, it is a position different from the first center 14d.

  As shown in FIG. 6, the first center 14d located above the second center 14e is the center of the arc of the lower outer surface 14b, and the first center located below the second center 14e. The center 14d is the center of the arc of the upper outer surface 14b.

  In FIG. 6, the cross-sectional shape of the upper outer surface 14b is an arc having a radius R11 centered on the first center 14d, and the cross-sectional shape of the lower outer surface 14b is a radius R11 centered on the first center 14d. Arc.

  The cross-sectional shape of the inner surface 14c is a circle having a radius R12 with the second center 14e as the center.

  By setting the first center 14d and the second center 14e at different positions, a thick portion 14f and a thin portion 14g are provided on the plate-like portion of the magnet 14a.

  Also in this embodiment, the same effect as 1st Embodiment can be acquired.

  In each of the above embodiments, the magnet 4a has a cylindrical shape. However, the magnet 4a is not limited to a cylindrical shape, and is a plate-like portion having a curved surface on the outer surface 4b and the inner surface 4c. May be.

  INDUSTRIAL APPLICABILITY The present invention can be used for a position detection device that detects an operation position of an operation means such as a handle grip of a motorcycle.

DESCRIPTION OF SYMBOLS 1 Position detection apparatus 2 Handle bar 3 Handle grip 4a, 14a Magnet (detected part)
4b, 14b outer surface 4c, 14c inner surface 4d, 14d first center 4e, 14e second center 4f, 14f thick part 4g, 14g thin part 4h defining part (notch part)
5 Magnetic detection means

Claims (6)

In a position detection device including a magnet that rotates based on a rotation operation of a handle grip provided on a handle bar, and a magnetic detection means that detects rotation of the magnet.
The magnet includes a plate-like portion having curved surfaces on its outer surface and inner surface, and at least a part of the shape of the outer surface and the inner surface has a circular cross-sectional shape perpendicular to the rotation axis direction of the magnet. The center of the arc shape of the outer surface is a first center, the center of the arc shape of the inner surface is a second center, the first center and the second center are different positions, and the magnet plate A position detecting device characterized in that a thick portion and a thin portion are provided in the shape portion. The position detection device according to claim 1, wherein the magnet has a cylindrical shape including the plate-like portion. The position detection device according to claim 2, wherein the magnetic detection means is provided in a cylinder of the magnet. The position detection device according to claim 1, wherein a defining portion that determines a magnetization direction is provided in the thick portion or the thin portion of the magnet. The position detection device according to claim 4, wherein the defining portion includes a cutout portion. The position detecting device according to claim 4, wherein the defining portion includes a protruding portion.

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