JP2012021901A - Angle detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle detector capable of obtaining excellent output characteristics while reducing cost and improving assembly workability by using a single magnetic material.SOLUTION: An angle detector 1 comprises: a single and flat magnetic material 4a in a substantially circular shape; a pair of magnets 4b being in contact with both ends 4a1 of the magnetic material 4a; a rotational member 4 including the magnetic material 4a and the magnets 4b and rotating in accordance with operation amount of operation means; and a magnetic detection part 5 for detecting a change in a leakage magnetic field of the magnetic material 4a accompanying with the rotation of the rotational member 4. The magnetic material 4a is provided with a leakage magnetic field adjustment part 4a3 for adjusting leakage amount of the leakage magnetic field.

Description

  The present invention relates to an angle detector that detects an operation position of an operation means such as a handle grip of a two-wheeled vehicle by a magnetic detection unit such as a Hall IC.

  A conventional angle detector is disclosed in Patent Document 1 below, for example. The angle detector described in Patent Literature 1 is based on a pair of plate-like magnetic bodies, a pair of magnets that exist between a pair of magnetic bodies and are magnetized in different magnetic field directions, and an operation amount of an operation grip. Accordingly, a rotating member that rotates the pair of magnetic bodies and the pair of magnets, and a closed magnetic circuit formed by the pair of magnetic bodies and the pair of magnets, Accordingly, a magnetic detection unit for detecting a change in the leakage magnetic field generated in the closed magnetic circuit is provided.

JP 2007-187540 A

  However, since the conventional angle detector requires a pair of magnetic bodies, there is a problem that costs are increased. In addition, there is a problem in that the magnetic detection unit is forced to be constrained in the direction in which the closed magnetic circuit formed by a pair of magnetic bodies and a pair of magnets is incorporated in the rotating member.

  Therefore, in order to solve this problem, when one magnetic body constituting the closed magnetic circuit is used, conventionally, the magnetic material flows between the pair of magnetic bodies in a direction perpendicular to the plane direction of the magnetic body. The leakage magnetic field is attracted to the magnet side due to the single magnetic material, affecting the output characteristics of the magnetic detection unit, and there is a problem that desired output characteristics cannot be obtained. .

  Accordingly, the present invention focuses on the above-described problems, and provides an angle detector that can reduce cost and improve assembly workability with a single magnetic body and can obtain good output characteristics. It is intended.

  An angle detector according to the present invention includes a single, flat, substantially arc-shaped magnetic body, a pair of magnets in contact with both ends of the magnetic body, the magnetic body and the magnet, and an operation amount of an operating unit. An angle detector comprising: a rotating member that rotates in response to the rotation member; and a magnetic detection unit that detects a change in the leakage magnetic field of the magnetic body accompanying the rotation of the rotating member. A leakage magnetic field adjustment unit for adjusting the leakage amount is provided.

  Further, the leakage magnetic field adjustment unit is provided on both of the pair of magnets of the magnetic body.

  Further, the leakage magnetic field adjustment part is a protruding part protruding as compared with other parts of the magnetic body.

  Moreover, the said protrusion part protrudes in the plate | board surface direction of the said magnetic body.

  Moreover, the said protrusion part protrudes in the plate | board thickness direction of the said magnetic body.

  As described above, according to the present invention, it is possible to provide an angle detector that can reduce costs and improve assembling workability and obtain good output characteristics with a single magnetic body.

The side view of the angle detector of 1st Embodiment of this invention. Sectional drawing of the AA line in FIG. Sectional drawing of the BB line in FIG. The side view of the magnetic body of the embodiment. The side view seen from the angle different from FIG. 4 of the magnetic body of the embodiment. The figure which compares the output characteristic of the same embodiment and a prior art example. The side view of the magnetic body of 2nd Embodiment of this invention.

  Hereinafter, based on the attached drawings, a first embodiment of the present invention will be described by taking an angle detector that detects an operation position (rotation angle) of a handle grip rotatably provided on a handlebar of a motorcycle as an example. .

  An angle detector 1 of the present invention is provided on a handlebar 2 of a motorcycle (not shown), and includes a handle grip 3 that is an operation means, a rotating member 4 that rotates together with the handle grip 3, and the rotating member. 4, a magnetic body 4 a fixed to the rotating member 4, a magnet 4 b that is in contact with the magnetic body 4 a, a magnetic detection unit 5 that detects a change in magnetism, and a rotating member 4 that can rotate. A support member 7 that supports the magnetic detection unit 5 and supports the rotating member 4, the magnetic body 4 a, the magnet 4 b, and the magnetic detection unit 5 is provided.

  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, and the sleep 3a has a cylindrical shape made of a synthetic resin and is rotatably disposed on the outer periphery of the handle bar 2. The sleep 3a includes a collar 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 rotating 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 rotating member 4 is made of synthetic resin, is annular, has a hole 41 through which the supporting member 7 passes, and is supported by the supporting member 7 so as to be rotatable. The rotating member 4 is provided with a receiving portion 42 formed of a recess into which the connecting portion 3d provided on 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 rotating member 4, and the rotating member 4 rotates.

  The magnetic body 4a is made of a metal soft magnetic material, has a flat plate shape, and has a substantially semicircular arc shape. The magnetic body 4 a is fixed to the rotating member 4. One magnetic body 4a is provided. The magnetic body 4a is in contact with the two magnets 4b at both ends 4a1 to form a closed magnetic circuit.

  The magnet 4b is made of a permanent magnet and has a cylindrical shape. In the present embodiment, two magnets 4b are provided. The two magnets 4b are in contact with both end portions 4a1 of the magnetic body 4a and are fixed to the rotating member 4.

  The magnetic detection unit 5 converts a change in magnetic flux density into an electric signal, and is, for example, a Hall element. Two magnetic detectors 5 are provided, are arranged along the plate surface of the magnetic body 4a, and detect changes in the leakage magnetic field of the closed magnetic circuit formed by the magnet 4b and the magnetic body 4a. is there.

  Reference numeral 52 denotes a circuit board, which 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. The magnetic detection unit 5 is electrically connected to the circuit board 52. Further, the circuit board 52 is electrically connected with a wiring 54 connected to an external circuit. A signal from the magnetic detection unit 5 is output to an external circuit via the circuit board 52 and the wiring 54.

  Reference numeral 53 denotes a circuit holder part, which is formed integrally with the support member 7. The circuit holder portion 53 has a cup shape and houses the magnetic detection portion 5 and the circuit board 52. In particular, the circuit holder unit 53 includes a bag-shaped storage unit 55 that stores the magnetic detection unit 5, and the magnetic detection unit 5 is fitted into the storage unit 55. The storage portion 55 is provided close to the magnetic body 4a and along the plate surface of the magnetic body 4a.

  The support member 7 is made of a synthetic resin, is a ring-shaped cylindrical body having a hole 71 through which the handle bar 2 passes, and surrounds the outer periphery of the handle bar 2. The support member 7 is fixed to the handlebar 2 so as not to rotate by means not shown. The support member 7 includes a cylindrical rotation support portion 72, and supports the rotation member 4 so as to be rotatable.

  In FIG. 3, the support member 7 includes an outer peripheral movement restricting portion 73 larger than the outer periphery of the rotation support portion 72 on the left side of the rotation support portion 72. The movement restricting portion 73 restricts the movement of the rotating member 4 to the left side in FIG. 3 in the rotating shaft direction of the handle grip 3.

  Further, the support member 7 is provided with a retaining member 74 on the right side of the rotation support portion 72 in FIG. The retaining member 74 prevents the turning member 4 from falling off from the turning support portion 72 and restricts the movement of the turning member 4 to the right side in FIG. 3 in the turning axis direction of the handlebar grip 3. Is. In addition, since the magnetic body 4a is single, when the rotation member 4 is assembled to the support member 7, the rotation member 4 can be assembled from the right side in FIG.

  The support member 7 includes a support portion 75 on the left side of the movement restricting portion 73. The support portion 75 is integrally formed with a circuit holder portion 53 of the magnetic detection portion 5. 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 rotating member 4 of the rotating member 4, and the other end is fixed to the support member 7.

  The case 6 is composed of first and second cases 61 and 62. Both the first and second cases 61 and 62 are made of synthetic resin and have a substantially semicircular cup shape. The first and second cases 61 and 62 are divided along the direction of the rotation center axis of the handle grip 3. The first and second cases 61 and 62 are fixed by appropriate means such as welding.

  The case 6 houses the rotating member 4 and the magnetic detection unit 5. In this embodiment, the support member 7 also constitutes a part of the outer shell that houses the rotating member 4 and the magnetic detection unit 5 together with the case 6. The case 6 is fixed to the handlebar 2 so as not to rotate by means not shown.

  In addition, 63 is packing and the wiring 54 of the magnetic detection part 5 has penetrated.

  The magnetic body 4a of this embodiment is formed so that the width of the central portion 4a2 is narrower than the width of both end portions 4a1. The angle detected by the angle detector 1 of the present embodiment is 90 degrees, and a range of 45 degrees is used on each end 4a1 side with the center 4a2 of the magnetic body 4a as the center for angle detection.

  The magnetic body 4a is provided with a leakage magnetic field adjustment unit 4a3 that adjusts the leakage amount of the leakage magnetic field. Two leakage magnetic field adjustment parts 4a3 are provided, and are provided on both sides where the pair of magnets 4b of the magnetic body 4a are disposed. The two leakage magnetic field adjustment portions 4a3 are provided at positions that are line-symmetric with respect to the central portion 4a2 of the magnetic body 4a.

  The leakage magnetic field adjustment unit 4a3 is a protruding portion 4a4 that protrudes compared to other portions of the magnetic body 4a. The protrusion 4a4 protrudes in the plate surface direction of the magnetic body 4a. That is, the portion provided with the protruding portion 4a4 is formed wider than the vicinity of the portion where the protruding portion 4a4 is not provided.

Field H _G generated in the magnetic body 4a is expressed by the following equation.
_{μH G = B r × (S} M / S G)
The mu, permeability, _{B r} is the magnetic flux density, _{S M} is the magnetic body cross-sectional area, _{S G} is the magnetic body surface area. Thereby, the leakage amount of the magnetic body 4a leakage magnetic field can be adjusted by adjusting the ratio of the cross-sectional area and the surface area of the magnetic body 4a.

  FIG. 6 shows a comparison between the present invention in which the magnetic field 4a is provided with the leakage magnetic field adjustment unit 4a3 and the theoretical value of the conventional device not provided with the leakage magnetic field adjustment unit 4a3. The theoretical value is indicated by 0 of the output voltage on the Y axis in the figure. According to the figure, compared with the conventional case, the present invention can suppress the output error in the range of 0 to 15 degrees and 75 to 90 degrees, in particular, close to the theoretical value in the entire detection range, Good output characteristics can be obtained.

  With the above configuration, it is possible to provide the angle detector 1 capable of reducing the cost and improving the assembling workability with a single magnetic body 4a and obtaining good output characteristics.

  Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same and equivalent part as the said embodiment, and the detailed description is abbreviate | omitted.

  In the present embodiment, the leakage magnetic field adjustment portion 4a5 of the magnetic body 4a is configured by a protruding portion 4a6 that protrudes in the plate thickness direction of the magnetic body 4a as compared with other portions of the magnetic body 4a. In the present embodiment, the protrusion 4a6 protrudes from both surfaces of the flat magnetic body 4a. Also in the above configuration, the same effect as that of the above embodiment can be obtained. As another modification, the protrusion 4a6 protruding in the plate thickness direction may be provided only on the surface opposite to the surface facing the magnetic detection unit 5.

  The present invention can be used for an angle detector that detects an operation position of an operation means such as a handle grip of a two-wheeled vehicle.

1 Angle detector 3 Handle grip (operating means)
4 Rotating member 4a Magnetic body 4a1 Both ends 4a2 Center 4a3 Leakage magnetic field adjustment part 4a4 Protrusion part 4a5 Leakage magnetic field adjustment part 4a6 Protrusion part 4b Magnet 5 Magnetic detection part

Claims (5)

A single flat, substantially arc-shaped magnetic body, a pair of magnets in contact with both end portions of the magnetic body, the magnetic body and the magnet, and rotating according to the amount of operation of the operating means In an angle detector including a member and a magnetic detection unit that detects a change in a leakage magnetic field of the magnetic body accompanying the rotation of the rotating member,
An angle detector characterized in that a leakage magnetic field adjustment unit for adjusting a leakage amount of a leakage magnetic field is provided in the magnetic body. The angle detector according to claim 1, wherein the leakage magnetic field adjusting unit is provided on both of the pair of magnets of the magnetic body. The angle detector according to claim 1, wherein the leakage magnetic field adjustment unit is a protruding portion that protrudes as compared with other portions of the magnetic body. The angle detector according to claim 3, wherein the protruding portion protrudes in a plate surface direction of the magnetic body. The angle detector according to claim 3, wherein the protruding portion protrudes in a plate thickness direction of the magnetic body.

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