JP4941807B2 - Angle detector - Google Patents

Description

  The present invention relates to a non-contact type angle detector that detects an operation position (rotation angle) of an operation means mounted on various vehicles such as motorcycles and automobiles with a magnetic detector composed of a Hall IC or the like. is there.

Conventionally, as this type of non-contact angle detector, for example, the one described in Patent Document 1 below is known. The angle detector described in Patent Document 1 includes a first magnetic body formed in a substantially semicircular arc shape, the first magnetic body so as to surround the first magnetic body, and the first magnetic body. The direction of the magnetic field (N pole, S pole) arranged to form a closed magnetic circuit at both ends of the gap formed between the concentric second magnetic body and the first and second magnetic bodies is the same. Two permanent magnets, and a detection element such as a Hall element is arranged inside the closed magnetic circuit so as to detect a leakage magnetic field generated in the gap (inside the closed magnetic circuit). When the detection element moves in the gap and detects the leakage magnetic field in response to rotation (rotation operation of the operation means), the rotation of the detected body (the operation means) is performed based on the output from the detection element. The moving angle was detected.
Japanese Examined Patent Publication No. 6-63769

  By the way, in the non-contact type angle detector as described in Patent Document 1, the change in output from the detection element has linearity over the entire range of the rotation angle of the operating means in order to improve the detection accuracy. For this reason, improvement in linearity is demanded. However, in the case of the angle detector described in Patent Document 1, the first magnetic body and the second magnetic body positioned outside the first magnetic body are both formed in a substantially semicircular arc shape, and are closed by each magnetic body. Since the two permanent magnets constituting the magnetic circuit are arranged at both ends of the gap formed between the magnetic bodies, the magnetic bodies and the permanent magnets are manufactured at the time of manufacture. Due to variations in processing accuracy, the substantially semicircular arc-shaped magnetic bodies may be disposed in a state where they do not partially abut (surface contact) with the permanent magnets positioned therebetween.

  This is because the outer arc surface of the first magnetic body and one surface of each permanent magnet corresponding to the outer arc surface, and the other arc surface of the second magnetic body and the other surface of each permanent magnet facing it. Means that it does not adhere in all areas. For example, one of the two permanent magnets is in surface contact with the first and second magnetic bodies in the entire region, and the other permanent magnet is at least one of the first and second magnetic bodies. When the magnetic field of the leakage magnetic field that leaks into the closed magnetic circuit is partially in a non-contact state without surface contact in the entire region, the other permanent magnet in the non-contact state exists. The side becomes weaker than the one permanent magnet side where the non-contact state does not exist.

  Therefore, when the operation means is rotated over the entire rotation range of the operation means, the detection element is rotated in synchronization with the rotation of the operation means. The relationship (output characteristic) between the rotation angle of the operating means and the output (output voltage) detected by the detection element rotating in synchronization with the rotation of the operating means is the one permanent magnet side Due to the fact that the magnetic force of the leakage magnetic field is slightly different on the other permanent magnet side, there is a problem that output characteristics having linearity cannot be obtained and good detection accuracy cannot be obtained.

  In order to make the non-contact state non-existent, that is, to bring the permanent magnets and the first and second magnetic bodies into surface contact in the entire region, the outer arc surface of the first magnetic body and The one surface of each of the corresponding permanent magnets, and the inner arc surface of the second magnetic body, and the other surface of each of the corresponding permanent magnets have the same curvature, so Since it is necessary to process a permanent magnet, in addition to the problem that the cost for manufacturing each magnetic body and each permanent magnet increases with the processing of the magnetic body and permanent magnet, the first and second If the processing accuracy of the circular arc surface during the production of the magnetic body varies, the gap formed between the first magnetic body and the second magnetic body cannot be maintained at a constant interval. Otherwise, it will affect the magnetic force of the leakage magnetic field. Given the there is a problem that linearity become worse, room for further improvement has been left.

  Accordingly, an object of the present invention is to provide an angle detector capable of ensuring linearity in the output characteristics between the rotation angle of the operation means and the output voltage in order to cope with the above-described problems.

The present invention provides a magnetic head in which a pair of magnets are disposed between a pair of magnetic bodies having opposing surfaces and a closed magnetic circuit is formed by the pair of magnetic bodies and the pair of magnets, and a handlebar. A rotating member that rotates the magnetic head in accordance with an operation amount of an operating means that is movably mounted, and is disposed inside the closed magnetic circuit in the magnetic head, and with the rotation of the rotating member in the angle detector and a magnetic detector for detecting a change in the leakage magnetic field generated inside of the closed magnetic circuit, said pair of magnetic bodies are formed by a pair of flat plate-plate, the pair of the opposing surface Ri Na and the magnetized surface of the magnet in contact each surface, the rotating member includes an annular portion having an insertion portion in which the handle bar is inserted, a pair of flanges which are protruding around the annular portion And the pair of flange portions includes the pair of flange portions. Wherein a pair of through holes for embedding the magnets are provided.

  Further, the present invention provides a pair of recesses or a pair of step surfaces substantially parallel to the facing surface on each of the facing surfaces, and the pair of recesses or the pair of step surfaces and the magnetized surfaces of the pair of magnets, respectively. It is characterized by being in surface contact.

  Further, the present invention is characterized in that the pair of magnets that rotate in synchronization with the rotation of the rotation member are disposed so as not to contact the magnetic detector.

  In the invention, it is preferable that the rotating member includes a holding body that holds the magnetic head.

  The present invention is characterized in that the pair of magnets are formed in a columnar shape.

  According to the present invention, it is possible to provide an angle detector that can achieve the initial purpose and can ensure linearity in the output characteristics between the rotation angle of the operation means and the output voltage.

(First Embodiment) A first embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment of the present invention, respectively. Hereinafter, based on these, the first embodiment of the present invention is operated to be rotatable on a handlebar mounted on, for example, a motorcycle. A case where the present invention is applied to an angle detector that detects the operation amount (rotation angle) of the grip will be described.

  1 and 2, an angle detector A1 according to this embodiment includes an operation grip (operation means) 2 rotatably attached to a cylindrical handle bar 1 made of aluminum, iron, or the like mounted on a motorcycle. The rotation member 3 that rotates in synchronization with the rotation operation of the operation grip 2, a pair of magnetic bodies (yokes) 4 that sandwich the rotation member 3, and two later-described rotation members 3. A pair of magnets 5 embedded in the through-hole portions to form a closed magnetic circuit with the pair of magnetic bodies 4, and a leakage magnetic field that is disposed inside the closed magnetic circuit and is detected in the closed magnetic circuit. Magnetic detection body 6, a circuit board 7 on which the magnetic detection body 6 is mounted, a rotating member 3, a magnetic body 4, a magnet 5, a magnetic detection body 6, and the like, and a frame body 8. And a holding body 9 for fixing and holding the handle bar 1. It is configured.

  The operation grip 2 is made of a synthetic resin material such as polyacetal, and is attached so as to cover the outer periphery of the handlebar 1 of the two-wheeled vehicle located on the right side in FIG. A first collar 2a accommodated in a second accommodating section (described later) provided in the holding body 9 so as to communicate with the first accommodating section, and a first on the right side of the first collar 2a. The first collar portion 2a is formed so as to project toward the rotating member 3 and is fitted into a fixing portion (described later) of the rotating member 3. A rod-shaped protrusion 2c is formed. The protrusion 2c has a function as a rotation (rotation) transmission unit for transmitting the rotation operation force (operation amount) of the operation grip 2 to the rotation member 3 (the fixed unit).

  In FIG. 1, a rubber grip 10 made of a rubber material is attached to the right side of the second flange 2b so as to cover the outer periphery of the operation grip 2, and this rubber grip 10 is used for driving a motorcycle. A grip portion 10a that can be gripped by a person is provided. Accordingly, when the driver grips the grip portion 10a and rotates the grip portion 10a, the rotational operation force is transmitted to the operation grip 2 through the rubber grip 10, thereby projecting from the operation grip 2. A turning force for rotating the rotation member 3 through the fixed portion acts on the protrusion 2c.

  The rotating member 3 is made of a synthetic resin material and is formed in a substantially flat plate shape. The outer shape of the rotating member 3 is a substantially arc shape in which both end portions of a substantially semi-annular shape are deleted. In FIG. 2, the rotating member 3 has a substantially arc-shaped base portion 3 a located between a base portion, which will be described later, of each magnetic body 4 and the handle bar 1, and both end portions of the base portion 3 a being each magnetic body 4. Are sandwiched between a pair of projecting portions to be described later, and a substantially circular shape for embedding a pair of magnets 5 coupled to each magnetic body 4 by a magnetic coupling force at both ends. The through-hole portion 3b is formed as an opening.

The rotating member 3 is held between the magnetic bodies 4 by the magnetic coupling force through the magnets 5 embedded in the through-hole portions 3b . This means that the rotating member 3 is a holding body (holder) that can hold the magnetic bodies 4 and the magnets 5. The rotating member 3 projects to the front side (the second frame body side) of the base portion 3a so as to slide in a substantially semi-annular groove portion of a second frame body to be described later of the frame body 8. The substantially arc-shaped sliding protrusion 3c formed and the frame 8 on the side opposite to the sliding protrusion 3c are formed so as to protrude from the peripheral wall portion side of the first frame, which will be described later. And a fixed portion 3d having a substantially U-groove shape.

  The magnetic body 4 has a first magnetic body 4a made of a substantially flat plate and the same shape and thickness as the first magnetic body 4a. The first magnetic body 4a has a certain (predetermined) value. The second magnetic body 4b is disposed so as to face each other with an interval. Each of the magnetic bodies 4a and 4b is made of a metal material such as iron and formed by punching or the like. The base portion 4c of the first magnetic body 4a and the base portion 4d of the second magnetic body 4b Similarly, it has a substantially arc shape in which both end portions of a substantially semi-annular shape are deleted, and both end portions of the arc-shaped base portions 4c and 4d extend in a flat plate shape so as to be bent inward (toward the handlebar 1). A pair of projecting portions 4e and 4f each having a flange portion are formed. And a pair of these protrusion parts 4e and 4f become the structure which clamps the said both ends of the rotation member 3 with the said magnetic coupling force. Since each magnetic body 4 and the rotating member 3 are fixed using a predetermined fixing means such as heat welding, the rotating member 3 and each magnetic body are changed according to the rotating operation of the operation grip 2. 4 and the magnets 5 formed by magnetically coupling the magnetic bodies 4 all rotate simultaneously.

The magnet 5 includes a first magnet 5a formed in a substantially disc shape (substantially cylindrical shape) and a second magnet 5b having the same shape and the same thickness as the first magnet 5a, and is a rotating member. 3 is embedded in each through-hole portion 3b, and each projecting portion 4e, 4f (each magnetic body 4a, 4b) is magnetically coupled and held by its magnetic force (the magnetic coupling force). The magnets 5a and 5b and the magnetic bodies 4a and 4b constitute a magnetic head. In this case, the magnets 5a and 5b are made of a magnetic material such as samarium-cobalt, and are attached so that the N pole and the S pole are opposite to each other between the protrusions 4e and 4f of the magnetic bodies 4a and 4b. Since it is magnetized, a closed magnetic circuit is formed by the magnetic bodies 4a and 4b and the magnets 5a and 5b.

  Specifically, the first magnet 5a is magnetized so that the first magnetic body 4a (projecting part 4e) side has an N pole and the second magnetic body 4b (projecting part 4f) side has an S pole. On the contrary, the second magnet 5b is magnetized so that the protruding portion 4f side has an N-pole and the protruding portion 4e side has an S-pole, and the magnetic fields generated by the magnets 5a and 5b are changed to the protruding portions 4e and 5b. By being guided to the bases 4c and 4d of the magnetic bodies 4a and 4b through 4f, the magnetic bodies 4a and 4b and the magnets 5a and 5b have a substantially loop-like closed magnetism in the direction indicated by the arrows in FIG. A circuit M is formed. At this time, the opposing surfaces P1 of the projecting portions 4e and 4f extending in a direction orthogonal to the plate thickness direction of the magnetic bodies 4a and 4b (projecting portions 4e and 4f) and the corresponding cylindrical shapes The magnets 5a and 5b corresponding to the front and back surfaces of the magnet 5a and 5b are in close contact with the front and back surfaces (that is, the magnetized surfaces magnetized to the N or S poles) P2 uniformly in the entire region by the magnetic coupling force. Thus, the magnets 5a and 5b are bonded and held together (see FIG. 3).

  In addition, the shape of each magnet 5a, 5b is not restricted to a columnar shape, and an arbitrary shape can be adopted. For example, a substantially quadrangular prism shape (substantially rectangular parallelepiped shape) or a cylindrical shape may be employed. In this case, the shape of each through-hole portion 3b in which each magnet 5a, 5b is embedded needs to be provided corresponding to the outer shape of each magnet 5a, 5b.

  The magnetic detector 6 is formed of a detection element such as a Hall IC or an MR element (semiconductor magnetoresistive element), and is positioned between the bases 4c and 4d of the magnetic bodies 4a and 4b, and the magnetic bodies 4a and 4b. The change of the leakage magnetic field accompanying the movement (rotation) of the magnets 5a and 5b formed by magnetically coupling them is converted into an electric signal, and the electric signal is output to the outside through an electric cord described later. The magnetic detector 6 is positioned between the bases 4c and 4d, and the magnets 5a and 5b are positioned not at the bases 4c and 4d but at the protrusions 4e and 4f. The magnets 5 a and 5 b that rotate with the rotation of 3 do not come into contact (contact) with the magnetic detection body 6.

  The circuit board 7 has a predetermined wiring pattern formed on a substantially rectangular substrate made of an insulating material such as glass epoxy, and is disposed below the magnetic bodies 4a and 4b. An electronic component or the like (not shown) is electrically fixed by solder or the like. The circuit board 7 is provided with a plurality of electric cords 11 for transmitting the electric signal from the magnetic detector 6 to an engine control unit which is an external control unit (not shown). These are electrically connected to predetermined locations by solder, and are routed to the outside through holes of elastic members to be described later, and are connected to the engine control unit.

  In the case of the present embodiment, the circuit board 7 and the magnetic detector 6 are housed in a housing (not shown) and then fixed by filling the housing with a sealing member (not shown) made of epoxy resin or the like. Is done. The housing is fixed to the first frame body, which will be described later, of the frame body 8 by heat welding or the like.

  In addition, 12 is an elastic member such as a grommet for protecting each electric cord 11 so that each electric cord 11 is not disconnected. This elastic member 12 includes a plurality of holes 12a through which each electric cord 11 passes, The frame 8 includes a pair of locking portions 12b and 12c each having a substantially concave shape into which an end of a peripheral wall portion of a first frame, which will be described later, and a convex portion of a second frame, which will be described later, of the frame 8 are fitted. ing. The elastic member 12 has a frame body in a state in which the electric cords 11 penetrating the holes 12a are held by the end portions of the peripheral wall portions and the convex portions being respectively locked by the locking portions 12b and 12c. 8 is mounted so as to close an opening formed by the first frame body and the second frame body.

  The frame body 8 includes a first frame body 8a and a second frame body 8b made of various metal materials such as a nonmagnetic metal material such as aluminum or a synthetic resin material. The first frame 8a is formed in a substantially semicircular cross section, and the first frame 8a accommodates each member such as the rotating member 3, the magnetic body 4, the magnet 5, the magnetic detector 6, and the circuit board 7 therein. The storage portion 8c, the thin semicircular arc-shaped peripheral wall portion 8d surrounding the first storage portion 8c, and the handlebar 1 side so as to cover the upper side of the first storage portion 8c and extending from the peripheral wall portion 8d. And a pair of flange portions 8e formed to be thick, and each flange portion 8e has a pair of screwed portions 8f for screwing bolts formed at positions corresponding to respective hole portions to be described later of the holding body 9. Is formed.

  The end 8g of the peripheral wall 8d is fitted into one of the substantially concave engaging portions 12b provided in the elastic member 12, and the end 8h located on the opposite side of the end 8g is the operation grip. 2 between the flanges 2a, 2b so as to cover the first flange 2a.

  The second frame 8b is a cover member for covering the first frame 8a from the side, is formed in a substantially flat plate shape, and serves as a sliding guide for the sliding projection 3c of the rotating member 3. A substantially semi-circular groove portion 8i (see FIG. 4) and a convex portion 8j fitted into the other substantially concave engaging portion 12c provided on the elastic member 12, and a sliding projection 3c is formed along the groove portion 8i. By sliding, the magnetic body 4 and the magnet 5 held by the rotating member 3 pass through a hollow area (inside the first storage portion 8c) formed by the frame bodies 8a and 8b and the handle bar 1. The handlebar 1 (operation grip 2) can be rotated about a predetermined angle about the rotation axis L. Accordingly, since the closed magnetic circuit M formed by the magnetic body 4 and the magnet 5 moves, a change in the leakage magnetic field (change in output voltage) generated in the closed magnetic circuit M can be detected by the magnetic detection body 6.

  Further, the maximum pivotable angle of the operation grip 2 in this embodiment is set to about 80 degrees, and the positions of the rotation member 3 and each magnetic body 4 shown in FIG. It shows the state of being moved. When the rotation angle of the operation grip 2 is 0 degree, the sliding projection 3c is located on the right end side of the groove 8i. Therefore, the rotation member 3 and each magnetic body 4 are shown in FIG. It is arranged on the right side of the position shown in FIG. 2 so as to substantially fill the right half region. On the other hand, when the rotation angle of the operation grip 2 is 80 degrees, the sliding protrusion 3c is positioned on the left end side of the groove 8i. Therefore, the rotation member 3 and each magnetic body 4 are shown in FIG. It is arranged on the left side of the position shown in FIG. 2 so as to substantially fill the left half region. Further, when the driver releases the turning operation of the operation grip 2 from, for example, the state in which the operation grip 2 is turned approximately 40 degrees, the operation grip 2 is moved to the normal position (that is, the coil spring of the throttle body not shown). The operation grip 2 is returned to the position at the rotation angle 0 degree).

  In the case of this embodiment, the inner and outer peripheral surfaces of the base portions 4c and 4d in the magnetic bodies 4a and 4b, the inner and outer peripheral surfaces of the projecting portions 4e and 4f, and the base portion 3a of the rotating member 3 are used. The inner peripheral surface and the outer peripheral surface of the sliding projection 3c, the inner peripheral circular arc surface and the outer peripheral circular arc surface of the sliding projection 3c, and the pair of circular arc surfaces facing the substantially semicircular annular groove 8i in the second frame 8b are all rotated. It is set to a concentric circle centered on the axis. The first frame 8a and the second frame 8b are fixed by appropriate fixing means such as caulking.

  The holding body 9 is made of various metal materials such as a non-magnetic metal material such as aluminum or a synthetic resin material. The holding body 9 is disposed above the frame body 8 and includes a fastener for sandwiching and fixing the handle bar 1. And a pair of substantially thin plate-like placement portions 9a placed on the flange portions 8e of the first frame body 8a and the placement portions 9a so as to cover the upper part of the handlebar 1 A cover portion 9b disposed inside each flange portion 8e, and a second portion that is formed continuously from the cover portion 9b so as to cover the first flange portion 2a of the operation grip 2 and accommodates the first flange portion 2a. Each mounting portion 9a is formed with a hole portion 9d through which a bolt 13 made of a nonmagnetic metal material such as aluminum passes, at a position corresponding to the screwed portion 8f of the first frame 8a. Has been.

  The end 9f of the wall 9e surrounding the second storage portion 9c is covered with each flange 2a so as to cover the first flange 2a of the operation grip 2 in the same manner as the peripheral wall 8d of the first frame 8a. , 2b. In order to assemble the holding body 9 on the frame 8 so as to sandwich the handle bar 1, the bolt 13 is passed through the hole 9d, and the through end of the bolt 13 is screwed to the screwed portion 8f of the first frame 8a. You can screw it on. By configuring in this way, the frame body 8 and the holding body 9 can be easily fixed to the handle bar 1, so that an angle detector with good assembling workability can be provided. The angle detector A1 is configured by the above-described units.

  As described above, in the present embodiment, a pair of magnetic bodies 4a and 4b having opposed surfaces P1 facing each other, a pair of magnets 5a and 5b that are interposed between the opposed surfaces P1 and are magnetized in different magnetic field directions, A pair of magnetic bodies 4a, 4b and a pair of magnets 5a, 5b are rotated according to the amount of operation of the operation grip 2, and a pair of magnetic bodies 4a, 4b and a pair of magnets 5a, 5b are formed. And a magnetic detection body 6 that detects a change in a leakage magnetic field generated inside the closed magnetic circuit M as the rotating member 3 rotates, and includes a pair of magnetic bodies 4a. , 4b are formed in a flat plate shape, and the opposing surface P1 and the magnetized surfaces P2 of the pair of magnets 5a, 5b are brought into surface contact with each other, so that the operating grip 2 is rotated over the entire rotation range of the operating grip 2. Even if it is moved, Rotation angle of the operating handle 2 to an angle rotation (the operation amount), the relationship between the output voltage detected by the magnetic detector 6 (magnetic field change in the leakage magnetic field) have a relationship with linearity. That is, the pair of magnetic bodies 4a and 4b are formed in a flat plate shape, and the magnetic bodies 4a and 4b and the magnets 5a and 5b are in contact with each other so as to keep the distance between the opposing surfaces P1 constant. Since the magnetic force change of the leakage magnetic field becomes uniform in the closed magnetic circuit M, the rotation angle of the operation grip 2 and the output characteristic of the output voltage have a relationship more linear than in the past, and the detection accuracy is improved. It can be improved further.

  In the present embodiment, a pair of projecting portions 4e, 4f projecting inward (handle bar 1 side) so as to face the center of the handle bar 1 at both ends of the arc-shaped base portions 4c, 4d of the magnetic bodies 4a, 4b. The example in which the rotating member 3 is sandwiched between the projecting portions 4e and 4f and the magnetic detector 6 is disposed between the base portions 4c and 4d has been described. 3 and the base portions 4c and 4d may be reversed in position, that is, the projecting portions 4e and 4f are projected outward from both end portions of the base portions 4c and 4d, and are projected to the outside of the base portions 4c and 4d. It is also possible to adopt a configuration in which the rotating member 3 is held between the protruding portions 4e and 4f. In this case, the magnetic detection body 6 is mounted on a substantially arc-shaped circuit board disposed in a gap formed between the base portions 4c and 4d and the handle bar 1, and is positioned between the base portions 4c and 4d. is doing.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a schematic view of the angle detector in the second embodiment, and FIG. 6 is a cross-sectional view taken along the line CC in FIG. The angle detector A2 in the second embodiment includes an operation grip (operation means) 22 that is rotatably attached to the handle bar 21 and a rotation member that rotates in synchronization with the rotation operation of the operation grip 22. 23, a pair of magnetic bodies (yokes) 24 sandwiching the rotating member 23, and a pair of magnetic bodies 24 embedded in two through-hole portions to be described later of the rotating member 23 to form a closed magnetic circuit. A pair of magnets 25, a magnetic detector 26 disposed inside the closed magnetic circuit for detecting a leakage magnetic field generated in the closed magnetic circuit, and a circuit board 27 on which the magnetic detector 26 is mounted. And a frame body 28 that houses the magnetic body 24, the magnet 25, and the like.

  The operation grip 22 is made of a synthetic resin material such as polyacetal, and is attached so as to cover the outer peripheral portion of the handlebar 21 of the two-wheeled vehicle located on the right side in FIG. In this case, since the operation grip 22 is formed integrally with the rotation member 23, the rotation member 23 rotates according to the operation amount of the operation grip 22. By comprising in this way, since the member which comprises an angle detector is reduced, an increase in cost can be suppressed. In addition, 22a is a collar part formed in the edge part of the operation grip 22 used as the frame 28 side. Further, the operation grip 22 may not be integrated with the rotation member 23 but may be formed by a member separate from the rotation member 23.

  The rotating member 23 is made of a synthetic resin material, is formed in a substantially flat ring shape surrounding the handle bar 21, is located in a cavity S formed between the handle bar 21 and the frame body 28, and the handle bar 21 is An annular portion 23b having an insertion portion 23a for insertion is provided. A pair of flange portions 23c and 23d are formed at opposite positions on the outer peripheral portion of the annular portion 23b. Among these, the upper flange portion 23c in FIG. A flange portion 23d provided with a circular through-hole portion 23e for disposing (embedding) the magnet 25a, which is positioned below and set narrower than the flange portion 23c in FIG. A circular through hole 23f is provided for disposing the second magnet 25b.

  Reference numeral 23g denotes a contact surface that contacts a later-described rotation restricting portion of the frame body 28 when the operation grip 22 is returned to the normal position, and the contact surface 23g is provided on the flange portion 23c side. It consists of an inclined side wall. Further, on the front and back surfaces of the flange portions 23c and 23d adjacent to the through-hole portions 23e and 23f, welding pins (not shown) are formed so as to protrude at positions corresponding to holes (not shown) provided in each magnetic body 24. The rotating member 23 and the magnetic body 24 are fixed to each other by passing the welding pins through the holes and thermally welding the through ends of the welding pins protruding from the holes. ing.

  The magnetic body 24 has a first magnetic body 24a made of a substantially flat plate, the same shape and the same plate thickness as the first magnetic body 24a, and has a predetermined constant interval from the first magnetic body 24a. And a second magnetic body 24b disposed so as to face each other. Each of the magnetic bodies 24a and 24b is made of a metal material such as iron and is formed in a substantially semi-annular shape by punching or the like.

  The magnet 25 includes a first magnet 25 a formed in a substantially disc shape (substantially cylindrical shape) and a second magnet 25 b having the same shape and the same thickness as the first magnet 25. The first magnet 25a is embedded in the through hole 23e of the rotating member 23 and the second magnet 25b is embedded in the through hole 23f of the rotating member 23. Each magnetic body 24a, 24b is magnetically coupled and held by the magnetic force of 25b (the magnetic coupling force), and each magnet 25a, 25b and each magnetic body 24a, 24b constitute a magnetic head. Yes. In this case, the magnets 25a and 25b are made of a magnetic material such as samarium-cobalt, for example, and the N pole and the S pole are opposite to each other between the magnetic bodies 24a and 24b as in the first embodiment. Since it is magnetized, a closed magnetic circuit is formed by the magnetic bodies 24a and 24b and the magnets 25a and 25b. At this time, similarly to the first embodiment, the opposing surfaces P3 of the magnetic bodies 24a and 24b facing each other, and the front and back surfaces (N poles, N poles) of the magnets 5a and 5b corresponding to the cylindrical surface and back surfaces corresponding thereto. The magnetic surface (P4) is in contact (surface contact) with the magnetic coupling force so as to be in close contact with the entire region, so that the magnets 25a and 25b are connected to the magnetic bodies 24a. , 24b are coupled and held.

  The magnetic detector 26 includes a detection element such as a Hall IC or an MR element (semiconductor magnetoresistive element), and is positioned between the magnetic bodies 24a and 24b, and magnetically couples the magnetic bodies 24a and 24b. The change in the leakage magnetic field accompanying the movement (rotation) of each magnet 25a, 25b is converted into an electric signal, and the electric signal is output to the outside through an electric cord described later. In the case of the second embodiment, although the magnetic detector 26 is disposed on the rotating track of the magnet 25, it is disposed at a position where it does not contact the rotating magnet 25. 25 and the magnetic detector 26 are not in contact with each other.

  The circuit board 27 has a predetermined wiring pattern formed on a substantially rectangular substrate made of an insulating material such as glass epoxy, and is disposed below the magnetic body 24. The circuit board 27 includes a magnetic detector 26, a capacitor, and the like (not shown). Electronic parts or the like are electrically fixed by solder or the like. The circuit board 27 is provided with a plurality of electric cords 29 for transmitting the electric signal from the magnetic detector 26 to an engine control unit (not shown). Each electric cord 29 is soldered to a predetermined portion of the circuit board 27. Is electrically connected to the engine control unit.

  The frame body 28 is divided into an upper frame body 28a and a lower frame body 28b made of various metal materials such as non-magnetic metal materials such as aluminum or a synthetic resin material, and the upper frame body 28a and the lower frame body 28b. The space region formed between the space 28b and the space 28b forms a storage portion for storing the rotation member 23, the magnetic body 24, the magnet 25, the magnetic detection body 26, the circuit board 27, and the like. The upper frame 28a is mainly composed of a pair of opposing semicircular flat plate portions 28c and 28d and a curved wall portion 28e that closes the curved surface side opening of each of the semicircular flat plate portions 28c and 28d. Reference numeral 28f denotes a rotation restricting portion that restricts the rotation of the rotation member 23 by contacting the contact surface 23g of the rotation member 23 when the operation grip 22 is released from the rotation operation. The portion 28f is formed integrally with the curved wall portion 28e.

  On the other hand, the lower frame body 28b includes a pair of flat plate portions 28g and 28h having a shape in which one end of a curved surface constituting a semicircle bulges outward, and the curved surface in each of the flat plate portions 28g and 28h and It is mainly composed of a wall portion 28i that closes the opening of the continuous bulge portion, and the circuit board 27 is accommodated in the bulge portion. Each frame 28a, 28b is fixed by appropriate fixing means such as a bolt (not shown) made of a nonmagnetic metal material.

  Also in the second embodiment, the magnetic bodies 24a and 24b are both formed in a substantially flat plate shape, and the magnetized surface P4 in which the magnets 25a and 25b are in surface contact with the opposing surface P3 of the magnetic bodies 24a and 24b uniformly. Thus, even when the operation grip 22 is rotated over the entire rotation range of the operation grip 22, the rotation angle (operation amount) of the operation grip 22 that rotates by a predetermined angle and the magnetic detection are provided. The relationship with the output voltage (the magnetic force change of the leakage magnetic field) detected by the body 26 is a relationship having linearity. That is, the magnetic bodies 24a and 24b are formed in a substantially flat plate shape, and the magnetic bodies 24a and 24b and the magnets 25a and 25b are in contact with each other in a whole area so as to keep the distance between the opposing surfaces P3 constant. Since the change in magnetic force of the leakage magnetic field is uniform in the closed magnetic circuit, the output characteristic between the rotation angle of the operation grip 22 and the output voltage has a linearity as compared with the related art, and the detection accuracy is further improved. be able to.

  In each of the above embodiments, the opposing surfaces P1 (P3) made of flat surfaces of the pair of magnetic bodies 4a, 4b (24a, 24b) and the magnetized surfaces made of flat surfaces of the pair of magnets 5a, 5b (25a, 25b). The example in which P2 (P4) is brought into surface contact has been described. For example, as shown in FIG. 7, the opposed surface P1 (P3) is substantially lower than the opposed surface P1 (P3) in the opposed surface P1 (P3). It is also possible to form a pair of parallel step surfaces P5 and bring the magnetized surfaces P2 (P4) of the pair of magnets 5a, 5b (25a, 25b) into surface contact with the pair of step surfaces P5. Further, as shown in FIG. 8, a pair of recesses 30 formed by circular grooves that embed the vicinity of the magnetized surface P2 (P4) is formed on the opposing surface P1 (P3), and the pair of recesses 30 are magnetized with a cylindrical magnet. The vicinity of the surface P2 (P4) may be buried, and the bottom surfaces of the pair of recesses 30 and the magnetized surfaces P2 (P4) of the pair of magnets 5a, 5b (25a, 25b) may be brought into surface contact with each other. The step surface P5 can be provided at a position one step higher than the facing surface P1 (P3).

  In each of the above-described embodiments, the pair of magnetic bodies 4 and 24 are formed into a flat plate shape by punching, and the pair of magnets 5 and 25 interposed between the pair of magnetic bodies 4 and 24 are formed in a cylindrical shape. Since it is molded, the magnetic bodies 4 and 24 and the magnets 5 and 25 can be easily manufactured, and an increase in cost can be suppressed.

It is a figure which shows the general-view figure of the angle detector by 1st Embodiment of this invention. In FIG. 1, it is BB sectional drawing. It is a figure which shows the magnetic body and magnet by the same embodiment. It is a top view of the 2nd frame by the embodiment. It is a figure which shows the general-view figure of the angle detector by 2nd Embodiment of this invention. In FIG. 5, it is CC sectional drawing. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention.

Explanation of symbols

A1 Angle detector 1 Handlebar 2 Operating grip (operating means)
2c Projection 3 Rotating member 4 Magnetic body 4a First magnetic body 4b Second magnetic body 4e, 4f Protruding portion 5 Magnet 5a First magnet 5b Second magnet 6 Magnetic detector 7 Circuit board 8 Frame body 9 Holder M Closed magnetic circuit P1 Opposing surface P2 Magnetized surface

Claims (5)

A magnetic head in which a pair of magnets are disposed between a pair of magnetic bodies having opposing surfaces, and a closed magnetic circuit is formed by the pair of magnetic bodies and the pair of magnets;
A rotating member that rotates the magnetic head according to an operation amount of an operating means that is rotatably attached to the handlebar ;
An angle detector comprising a magnetic detector disposed in the closed magnetic circuit of the magnetic head and detecting a change in a leakage magnetic field generated in the closed magnetic circuit as the rotating member rotates. ,
It said pair of magnetic bodies are formed by a pair of flat plate-plate, Ri Na and magnetized surface of the facing surface and the pair of magnets in contact each surface,
The rotating member includes an annular portion having an insertion portion through which the handle bar is inserted, and a pair of flange portions formed to protrude around the annular portion,
The pair of flange portions are provided with a pair of through-hole portions for embedding the pair of magnets, respectively . Each of the opposing surfaces is provided with a pair of recesses or a pair of step surfaces substantially parallel to the opposing surface, and the pair of recesses or the pair of step surfaces and the magnetized surfaces of the pair of magnets are in surface contact with each other. The angle detector according to claim 1. The angle detector according to claim 1, wherein the pair of magnets that rotate in synchronization with the rotation of the rotation member are disposed so as not to contact the magnetic detection body. The angle detector according to claim 1, wherein the rotating member includes a holding body that holds the magnetic head. The angle detector according to claim 1, wherein the pair of magnets is formed in a cylindrical shape.

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