JP2010151731A - Position detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position detector for increasing a leakage magnetic flux density, and reducing the number of components. <P>SOLUTION: The position detector 1 includes: a magnetic member 4 turned based on a turn operation of a handle grip 3; and a magnetic detecting element 51 for detecting a change in a magnetic flux density of the magnetic member 4. The magnetic member 4 includes: a yoke 4b formed from a planar magnetic material; a magnet 4c having the same shape as the yoke 4b; and a base member 4a formed from a nonmagnetic material for providing a gap between the yoke 4b and the magnet 4c, and fixing them. A magnetic conversion element 51 is disposed between the yoke 4b and the magnet 4c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  A conventional position detection device includes a handle grip that is rotatably provided on a handlebar of a motorcycle, a magnetic member that rotates based on a rotation operation of the handle grip, and a detection unit that detects the position of the magnetic member. And was equipped with.

A magnetic member of a conventional position detection device includes a pair of flat plate-shaped magnetic bodies (yokes) and a pair of magnets interposed between the pair of magnetic bodies and magnetized in different magnetic field directions. And the said detection part was arrange | positioned in the closed magnetic circuit formed of the said pair of magnetic body and said pair of magnets (for example, refer patent document 1).
JP 2007-187540 A

  In the conventional position detecting device, since the pair of magnets are disposed at both ends of the pair of magnetic bodies and in the vicinity thereof so as to have different polarities at intervals, the leakage magnetic flux density is weak, and the output characteristics thereof Has a problem that it is easily affected by an external magnetic field and measures against the external magnetic field may be required.

  Further, from the viewpoint of the number of parts, there is a problem that if a pair of magnetic bodies and a pair of magnets are combined, four parts are required, and the manufacturing cost is high.

  Therefore, the present invention focuses on the above-described problems, and an object thereof is to provide a position detection device that has a high leakage magnetic flux density and can reduce the number of components.

  The position detection device according to the present invention includes a magnetic member that rotates based on a rotation operation of a handle grip, and a magnetic detection element that detects a change in magnetic flux density of the magnetic member. Comprises a yoke made of a flat magnetic material, a magnet having the same shape as the yoke, and a base member made of a non-magnetic material for fixing the yoke and the magnet with a gap therebetween, and comprising the magnetic conversion element. , Arranged between the yoke and the magnet.

  The yoke and the magnet have a semicircular arc shape.

  As described above, according to the position detection apparatus of the present invention, it is possible to provide a position detection apparatus that has a high leakage magnetic flux density and can reduce the number of components.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings, taking as an example a position detection device that detects an operation amount (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 motorcycle (not shown). A handle grip 3, a magnetic member 4 that rotates together with the handle grip 3, and a change in magnetic flux density of the magnetic member 4. And a case body 6 in which the magnetic member 4 and the magnetic detection unit 5 are accommodated.

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

  The handle grip 3 is made of synthetic resin and has a cylindrical shape. The handle grip 3 is rotatably positioned on the outer periphery of the handle bar 2. On the left side of the middle of the handle grip 3 in FIG. The flange 3a is provided on the outer periphery of the handle grip 3 without any breaks. Moreover, the convex part 3b which protruded outside from the left side edge part of the handlebar grip 3 in FIG. 3 to the collar part 3a is provided. Further, the operation portion 3c gripped by the driver is from the right end portion of the handle grip 3 to the flange portion 3a. The operation portion 3c is provided with a cushion made of an elastic member such as rubber (not shown).

  The magnetic member 4 includes a base member 4a, a yoke 4b, and a magnet 4c.

  The base member 4a is made of a nonmagnetic material. The base member 4a includes a fitting hole 41 into which the handle grip 3 is fitted. The fitting hole 41 is provided with a concave portion 42 into which the convex portion 3b of the handle grip 3 is fitted. By fitting the convex portion 3 b of the handle grip 3 into the concave portion 42 of the fitting hole portion 41, the magnetic member 4 rotates with the rotation of the handle grip 3.

  In addition, the base member 4 a includes a first shaft portion 43 on the operation portion 3 c side of the handle grip 3 of the fitting hole portion 41. In addition, a second shaft portion 44 is provided on the opposite side of the fitting hole portion 41 from the first shaft portion 43. The first and second shaft portions 43 and 44 have a circular cross-sectional shape in a direction perpendicular to the rotation axis direction of the handle grip 3. The centers of the circles of the first and second shaft portions 43 and 44 are on the same line.

  The yoke 4b is made of a metal soft magnetic material and has a flat plate shape. Moreover, it is a semicircular arc shape. One yoke 4b is fixed to the base member 4a, and the position thereof is in the vicinity of the second shaft portion 44 of the base member 4a.

  The magnet 4c is made of a permanent magnet and has the same shape as the yoke 4b. One magnet 4c is fixed to the base member 4a, and the position thereof is in the vicinity of the first shaft portion 43 of the base member 4a.

  The yoke 4b and the magnet 4c are provided with a gap in the base member 4a, and the flat plate-like surfaces of each other are parallel to each other. The flat plate-like surface is provided so as to be perpendicular to the rotation axis direction (longitudinal direction) of the handle grip 3. Further, the yoke 4b and the magnet 4c are disposed so as to be the same when projected in the direction of the rotation axis of the handlebar grip 3.

  The yoke 4b and the magnet 4c form a closed magnetic circuit, and magnetic lines of force are generated from the magnet 4c toward the yoke 4b. The direction of the magnetic lines of force is relative to the planar surface direction of the yoke 4b and the magnet 4c. In the vertical direction.

  The magnetic detection unit 5 includes a magnetic detection element 51, a circuit board 52, and a circuit holder 53.

  The magnetic detection element 51 converts a magnetic change into an electric signal, and is, for example, a Hall element. Two magnetic detection elements 51 are provided and are arranged between the yoke 4b and the magnet 4c, and detect a change in leakage magnetic flux density of a magnetic circuit formed by the magnet 4c and the yoke 4b.

  The circuit board 52 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 element 51 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 element 51 is output to an external circuit via the circuit board 52 and the wiring 54.

  The circuit holder 53 is made of synthetic resin and has a cup shape. The circuit holder 53 is fixed to the case body 6. The circuit holder 53 accommodates the magnetic detection element 51 and the circuit board 52. In particular, the circuit holder 53 includes a bag-shaped storage portion 55 that stores the magnetic detection element 51, and the magnetic detection element 51 is fitted into the storage portion 55. The storage portion 55 is provided so as to be positioned between the yoke 4b and the magnet 4c.

  The case body 6 is composed of first and second case bodies 61 and 62. Both the first and second case bodies 61 and 62 are made of synthetic resin. The first and second case bodies 61 and 62 are assembled in the direction of the rotation center axis of the handle grip 3. The first and second case bodies 61 and 62 are fixed by welding.

  The first case body 61 has a cylindrical cup shape with a bottom, and includes a first opening 63 formed of a hole penetrating the bottom portion. The first opening 63 is circular. This 1st opening part 63 supports the 1st axial part 43 of the base member 4a rotatably.

  Further, a first seal member 71 is provided between the first opening 63 and the first shaft portion 43. The first opening 63 includes a recess 64 that houses the first seal member 71. The first seal member 71 is made of an elastic member such as rubber. In order to reduce sliding friction between the first opening 63 and the first shaft portion 43, an X ring, a V ring, or the like having a small contact area is used. A seal member is preferred.

  The second case body 62 has a cylindrical cup shape with a bottom, and includes a second opening 65 formed by a hole penetrating the bottom portion. The second opening 65 is circular. This 1st opening part 65 supports the 2nd axial part 44 of the base member 4a rotatably.

  In addition, a second seal member 72 having a function equivalent to that of the first seal member 71 is provided between the second opening 65 and the second shaft portion 44. The second opening 65 is provided with a recess 66 for accommodating the second seal member 72.

  The centers of the circles of the first and second openings 64 and 65 are on the same line.

  A circuit holder 53 is fixed to the second case body 62. In addition, 67 is packing and the wiring 54 of the magnetic detection part 5 has penetrated.

  The case body 6 is fixed by welding of the first and second case bodies 61 and 62, and the first and second seal members 71 and 72 and the packing 67 allow foreign matter such as water and dust to enter the case body 6. Is configured to prevent intrusion.

  Next, a method for assembling the position detection device 1 will be described.

  First, the magnetic detection unit 5 and the second seal member 72 are assembled to the second case body 62.

  Second, the magnetic member 4 is moved to the second seal member 72 so that the storage portion 55 is positioned between the yoke 4b and the magnet 4c, and the second shaft portion 44 is fitted into the second seal member 72. The case body 62 is assembled.

  Third, the first case body 61 is assembled to the magnetic member 4 and the second case body 62 so that the first shaft portion 43 is fitted into the first seal member 71, and the first and second case bodies are assembled. The case bodies 61 and 62 are fixed by welding.

  Fourth, the handle grip 3 is inserted into the fitting hole 41 of the magnetic member 4 to complete the assembly of the position detection device 1.

  Finally, the handle bar 2 is inserted into the handle grip 3 of the completed position detection device 1, and the assembly to the vehicle is completed. The position detection device 1 is fixed to the handlebar 2 by appropriate means.

  With the above configuration, it is possible to provide the position detection device 1 in which the magnetic flux leakage density of the magnetic circuit formed by the yoke 4b and the magnet 4c is increased, and the output characteristics thereof are not easily affected by the external magnetic field. Moreover, since a magnetic circuit can be comprised by the one yoke 4b and the one magnet 4c, the position detection apparatus 1 which reduced the number of parts can be provided.

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. The perspective view which shows the yoke and magnet of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Position detection apparatus 2 Handle bar 3 Handle grip 4 Magnetic member 4a Base member 4b Yoke 4c Magnet 5 Magnetic detection part 51 Magnetic detection element

Claims (2)

In a position detection device comprising a magnetic member that rotates based on a rotation operation of a handle grip, and a magnetic detection element that detects a change in magnetic flux density of the magnetic member,
The magnetic member includes a yoke made of a flat magnetic material, a magnet having the same shape as the yoke, and a base member made of a nonmagnetic material that fixes the yoke and the magnet with a gap therebetween. A position detecting device, wherein a conversion element is disposed between the yoke and the magnet. The position detection device according to claim 1, wherein the yoke and the magnet have a semicircular arc shape.

Images