JP2015161661A - Instrument device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instrument device capable of suppressing an unusual sound due to the vertical motion of a rotary shaft or a magnet from being heard.SOLUTION: Provided is an instrument device 8 comprising a pointer type meter 10 indicating the speed of a vehicle 1, a circuit board 12 electrically connected to the pointer type meter 10, a body 14 to be detected that rotates together with a rotary shaft 28 to which the rotation associated with the speed of the vehicle 1 is conveyed, and a detection unit 15 for detecting the rotation of the body 14 to be detected, wherein the instrument device 8 is equipped with a magnetism shielding cover 14a enclosing the periphery of the object 14 to be detected and comprising a magnetic material that rotates together with the rotation of the rotary shaft 28, and an unusual sound suppression member 36 between the object 14 to be detected and the magnetism shielding cover 14a.

Description

  The present invention relates to an instrument device that displays the speed of a moving body, and more particularly, to an instrument device that displays the speed of a motorcycle or the like.

  A conventional instrument device includes a speedometer as a display means for displaying the speed of a vehicle, a circuit board electrically connected to the speedometer, a case for housing the speedometer and the circuit board, and rotation of the speed of the vehicle. A magnet that is a detected object mounted on a rotating shaft that rotates together with a rotating cable that transmits a signal, and a detection unit that includes a Hall IC that detects rotation of the magnet, and the detection unit is mounted on a circuit board and a case The detection unit is configured to be housed therein (see, for example, Patent Document 1).

JP 2008-32615 A

  However, in the conventional instrument device, since the rotation shaft is rotatably supported, a clearance is necessary in the direction of the rotation axis, and abnormal noise is generated by the vertical movement of the rotation axis and the rotation axis of the magnet caused by this clearance. There was a problem that this abnormal noise was heard. In particular, in a configuration including a cup-shaped magnetic shielding cover made of a magnetic material that covers the periphery of the magnet in order to suppress magnetic interference with the speedometer, abnormal noise is reflected by the magnetic shielding cover. There was a problem that could be heard.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an instrument device that can eliminate the above-described problems and suppress the hearing of abnormal noise due to the vertical movement of a rotating shaft and a magnet.

  The rotation angle detection device of the present invention rotates together with a pointer-type instrument that displays the speed of a vehicle, a circuit board that is electrically connected to the pointer-type instrument, and a rotating shaft that transmits rotation according to the speed of the vehicle. In a measuring instrument comprising a detected object and a detection unit that detects rotation of the detected object, a magnetic shielding cover made of a magnetic material that surrounds the detected object and rotates with the rotation of the rotating shaft; An abnormal noise suppressing member is provided between the detected body and the magnetic shielding cover.

  With the above-described configuration, the present invention can achieve an intended purpose and can provide an instrument device that can suppress an abnormal noise due to the vertical movement of a rotating shaft or a magnet.

Explanatory drawing of the two-wheeled vehicle carrying the instrument apparatus of 1st Embodiment of this invention. Sectional drawing of the meter apparatus of the embodiment. The top view of the magnet of the same embodiment and a magnetic shielding cover. Sectional drawing of the magnet and magnetic shielding cover of 2nd Embodiment of this invention. Sectional drawing of the magnet and magnetic shielding cover of 3rd Embodiment of this invention. Sectional drawing of the magnet and magnetic shielding cover of 4th Embodiment of this invention. Sectional drawing of the magnet and magnetic shielding cover of 5th Embodiment of this invention. Sectional drawing of the magnet and magnetic shielding cover of 6th Embodiment of this invention. The top view of the magnet and magnetic shielding cover of 7th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the basic configuration of the present invention, and will be described by taking a two-wheeled instrument device as a moving body as an example.

  The two-wheeled vehicle 1 is a vehicle, and includes a frame 2 made of metal such as aluminum, an internal combustion engine (engine) 3 that uses gasoline as fuel, a fuel tank 4 that stores gasoline, and a seat 5 on which a driver of the two-wheeled vehicle 1 sits. A front wheel 6, two front forks 7 that rotatably hold the front wheel 6, an instrument device 8, and a rotating cable 9 that transmits the rotation of the front wheel 6 to the instrument device 8. The engine 3, the fuel tank 4, and the seat 5 are attached to the frame 2, and the two front forks 7 are attached to the frame 2 so as to be steerable to the left and right.

  Next, the instrument device 8 will be described with reference to FIG. The instrument device 8 is electrically connected to a speedometer 10 that is a pointer-type instrument that displays the speed of the motorcycle 1, a liquid crystal display 11 that displays a travel distance of the motorcycle 1, and the speedometer 10 and the liquid crystal display 11. The speedometer 10 that rotates together with the circuit board 12 that rotates, the case 13 that houses the speedometer 10, the liquid crystal display 11 and the circuit board 12, and the rotating cable 9 that transmits the rotation of the front wheel 6 that is the rotation of the speed of the two-wheeled vehicle 1. And a Hall IC 15 that is a detection unit that is arranged so as to be positioned immediately above the magnet 14 by detecting the rotation of the magnet 14.

  The speedometer 10 includes a pointer 18, a dial plate 16 having scales and characters (not shown) indicated by the pointer 18, and an instrument body 19 that rotationally drives the pointer 18. Reference numeral 17 denotes a control unit that controls the speedometer 10 and the liquid crystal display 11.

  The dial 16 includes a through hole 20 and a window portion 21. The through hole 20 is penetrated by a pointer shaft 22 that connects the pointer 18 and the instrument body 19.

  The instrument main body 19 includes a cross coil instrument main body incorporating a magnet (not shown), a stepping motor, and the like, and is driven by a drive process of the control unit 17.

  The liquid crystal display 11 may display the remaining fuel amount, the engine coolant temperature, the time, and the like in addition to the travel distance described above. The liquid crystal display 11 includes a liquid crystal display element 23, a housing 24 that holds the liquid crystal display element 23, and a wiring member 25 that electrically connects the liquid crystal display element 23 and the circuit board 12. Reference numeral 26 denotes a light source that illuminates the liquid crystal display element 23 from behind, and for example, a light emitting diode is preferable.

  The housing 24 is made of white synthetic resin and has a box shape for supporting the liquid crystal display element 23 and forming a space for making the light of the light emitting diode 26 uniform.

  The wiring member 25 is obtained by providing a wiring pattern having conductivity such as copper on a flexible and insulating substrate such as polyimide. The wiring member 25 supplies an electric signal from the circuit board 12 to the liquid crystal display element 23. Reference numeral 27 denotes a connector for connecting the wiring member 25 to the circuit board 12.

  In the present embodiment, the circuit board 12 is made of a hard insulating substrate, and is provided with a wiring pattern (not shown) such as copper on the surface of an insulating material such as glass epoxy resin. An instrument body 19, a liquid crystal display 11, and a detection unit 15 of the speedometer 10 are fixed to the circuit board 12.

  The case 13 includes a back case 13a and a front cover 13b. The back case 13a and the front cover 13b are assembled so as to perform waterproof and dustproof functions for a motorcycle. In addition, it is not a complete sealing structure, and it is possible to ventilate the air inside and outside the case 13 by providing a filter (not shown) that does not transmit water but transmits gas. The back case 13 a is made of, for example, black synthetic resin that does not transmit light, and forms the back side of the instrument device 8. The front cover 13b is made of a synthetic resin that transmits light, and is colorless in this embodiment. The front cover 13 b forms the front side of the instrument device 8.

  The magnet 14 has a disk shape, and a rotation shaft 28 passes through the center thereof. The magnet 14 rotates together with a rotating shaft 28 to which the speed of the two-wheeled vehicle 1 (rotation of the front wheel 6) is transmitted. The magnet 14 in this embodiment is provided with 8 poles. The number of magnetic poles magnetized in the magnet 14 may be 4 poles or 12 poles.

  A magnetic shielding cover 14a is made of a magnetic material such as a cold rolled steel plate or permalloy. In this embodiment, it has a cylindrical cup shape, surrounds the periphery of the magnet 14, and rotates with the rotation of the rotating shaft 28.

  14b is a washer. The magnet 14, the magnetic shielding cover 14a, and the washer 14b are fixed so as to be sandwiched in the rotation axis direction of the rotation shaft 28. The magnet 14, the magnetic shielding cover 14a, and the washer 14b rotate together with the rotation shaft 28.

  An abnormal noise suppression member 36 made of a nonmagnetic elastic member is provided between the magnet 14 that is the detection object and the magnetic shielding cover 14a. As shown in FIG. 3, the noise suppressing member 36 is provided over the entire circumference between the magnet 14 and the magnetic shielding cover 14a. The portion indicated by the hatched portion in FIG. The noise suppressing member 36 is an elastic member, for example, a resin filler made of a synthetic resin having a curable fluidity, and is cured after being filled between the magnet 14 and the magnetic shielding cover 14a. . In this embodiment, the noise suppressing member 36 is filled so as to fill the magnetic shielding cover 14a.

  As described above, by providing the noise suppressing member 36 made of an elastic member between the magnet 14 and the magnetic shielding cover 14a, the reverberation by the magnetic shielding cover 14a is suppressed, and the rotary shaft 28 and the magnet 14 are moved up and down. It is possible to suppress an abnormal noise due to.

  The rotating shaft 28 is made of metal, and is rotatably supported by the rear case 13 a by a bearing portion 29. The bearing portion 29 is held by a cylindrical support body 30.

  A recess 28a is provided on the side of the rotating shaft 28 opposite to the side on which the magnet 14 is provided. The end 9a of the rotary cable 9 is inserted into the recess 28a. The recess 28a has a quadrangular cross-sectional shape in the direction perpendicular to the longitudinal direction, and the end 9a inserted into the recess 28a also has a shape that matches the recess 28a. The rotation of the rotary cable 9 is transmitted to the rotary shaft 28, and the rotary shaft 28 rotates.

  The bearing portion 29 is made of metal, is a cylindrical body, and is held so as not to come off from the support body 30. In addition, 31 and 32 are metal washers, 33 is a rotating shaft restraint formed in a donut shape. The rotating shaft 28 is rotatably supported by the bearing portion 29 with a washer 31, a bearing portion 29, a washer 32, and a rotating shaft restraint 33 interposed therebetween.

  The support 30 is made of metal and is a cylindrical body. A base plate 34 is sandwiched and fixed by the support 30 on the support 30. The base plate 34 is a plate body and is made of a magnetic material such as a cold-rolled steel plate or permalloy. In the present embodiment, the base plate 34 is made of a metal containing iron. The base plate 34 fixes the bearing portion 29 to the case 13 via the support body 30. The base plate 34 is fixed to the case 13 with screws 35.

  The Hall IC 15 serving as a detection unit is mounted on the circuit board 12 and is electrically connected to a wiring pattern (not shown) provided on the circuit board 12. The detection unit 15 includes a Hall element 15a and a protection unit 15b made of a synthetic resin. The protection unit 15b covers the hall element 15a in order to protect the hall element 15a. The Hall element 15a is a kind of sensor using a semiconductor and detects magnetism. In this embodiment, the rotation of the magnet 14 is detected by detecting the change in the magnetic field accompanying the rotation of the magnet 14.

  The control unit 17 is an integrated circuit such as an IC, is mounted on the circuit board 12, and is electrically connected to the wiring pattern provided on the circuit board 12. The control unit 17 includes a circuit unit 17a that is a main unit and a protection unit 17b that protects the circuit unit 17a. The protection unit 17b covers the circuit unit 17a in order to protect the circuit unit 17a.

  Next, a second embodiment of the present invention will be described with reference to FIG. 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 first embodiment, the noise suppressing member 36 is filled so as to fill the magnetic shielding cover 14a. However, the noise suppressing member 37 of the present embodiment is filled up to an intermediate portion of the magnetic shielding cover 14a. Even if it is filled, the reverberation by the magnetic shielding cover 14a can be suppressed, and the abnormal noise due to the vertical movement of the rotary shaft 28 and the magnet 14 can be suppressed.

  Next, a third embodiment of the present invention will be described with reference to FIG. 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 embodiment, the noise suppressing members 36 and 37 are in contact with the magnetic shielding cover 14a and the magnet 14, but the invention is not limited to the embodiment. In the present embodiment, the noise suppressing member 38 is It is made of an annular rubber material and is provided so as to contact only the magnetic shielding cover 14a. Specifically, it is provided in contact with the inner wall of the cup-shaped magnetic shielding cover 14a. In particular, it is more effective in the case of a member having considerable elasticity such as rubber. Even with such a configuration, it is possible to suppress the reverberation due to the magnetic shielding cover 14a and to prevent the sound generated by the vertical movement of the rotary shaft 28 and the magnet 14 from being heard.

  Next, a fourth embodiment of the present invention will be described with reference to FIG. 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 noise suppressing member 39 is made of an annular resin material, and is provided in contact with the magnetic shielding cover 14 a and the magnet 14. The cup-shaped magnetic shielding cover 14 a is provided so as to be in contact with the inner wall of the magnet 14 and the outer periphery of the magnet 14. Even with such a configuration, it is possible to suppress the reverberation due to the magnetic shielding cover 14a and to prevent the sound generated by the vertical movement of the rotary shaft 28 and the magnet 14 from being heard.

  Next, a fifth embodiment of the present invention will be described with reference to FIG. 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 noise suppressing member 40 is made of an annular resin material, and is provided so as to close the opening between the magnetic shielding cover 14 a and the magnet 14. Even with such a configuration, it is possible to suppress the reverberation due to the magnetic shielding cover 14a and to prevent the sound generated by the vertical movement of the rotary shaft 28 and the magnet 14 from being heard.

  Next, a sixth embodiment of the present invention will be described with reference to FIG. 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 noise suppressing member 41 is an annular, plate-shaped rubber material, and is provided between the bottom portion of the magnetic shielding cover 14 a and the bottom surface of the magnet 14. In this embodiment, the noise suppressing member 41 is fixed by being sandwiched by the rotating shaft 28 together with the magnet 14, the magnetic shielding cover 14a, and the washer 14b, and the noise suppressing member 41 and the magnet 14 are fixed to the magnetic shielding cover 14a. When the magnet 14 and the washer 14b are fixed, they can be assembled together by stacking them in the order of the washer 14b and tightening the rotating shaft 28. The thickness of the noise suppressing member 41 is set larger than the length between the bottom portion of the magnetic shielding cover 14a and the bottom surface of the magnet 14, so that the bottom portion of the magnetic shielding cover 14a and the bottom surface of the magnet 14 are The abnormal noise suppressing member 41 is fixed in a compressed state. Even with such a configuration, it is possible to suppress the reverberation due to the magnetic shielding cover 14a and to prevent the sound generated by the vertical movement of the rotary shaft 28 and the magnet 14 from being heard.

  Next, a seventh embodiment of the present invention will be described with reference to FIG. 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 above embodiment, the noise suppressing member is provided over the entire circumference between the magnet 14 and the magnetic shielding cover 14a. However, the noise suppressing member is not limited to the above embodiment. The sound suppressing member 42 is a plate-like body having elasticity, for example, a rubber material provided not partially on the entire circumference between the magnet 14 and the magnetic shielding cover 14a. The portion indicated by the hatched portion in FIG. 9 is the noise suppressing member 42. In this embodiment, three places are provided. The plurality of noise suppressing members 42 are provided at equal intervals around the entire circumference between the magnet 14 and the magnetic shielding cover 14a. By providing at equal intervals, it is possible to prevent the rotation balance of the magnet 14 from being adversely affected. Even with such a configuration, it is possible to suppress the reverberation due to the magnetic shielding cover 14a and to prevent the sound generated by the vertical movement of the rotary shaft 28 and the magnet 14 from being heard. In the present embodiment, the number of abnormal noise suppressing members 42 is three, but the number is not limited to the number of the present embodiment, and may be an arbitrary number. For example, as long as the rotation balance of the magnet 14 is not affected, the number of the noise suppressing member 42 may be one.

  In the above-described embodiment, the vehicle speed is taken out from the front wheel 6 of the two-wheeled vehicle 1 as the rotation of the vehicle. However, the present invention is not limited to the above-described embodiment, and is taken out from, for example, a transmission of an internal combustion engine. There may be.

  INDUSTRIAL APPLICABILITY The present invention is applicable to an instrument device, and more particularly, to an instrument device in which a magnet, which is a detected object mounted on a rotating shaft that rotates together with a rotating cable that transmits rotation of a vehicle speed, and an instrument main body are arranged close to each other. Is available.

1 Two-wheeled vehicle 8 Instrument device 10 Speedometer (pointer-type instrument)
12 Circuit board 14 Magnet (object to be detected)
14a Magnetic shielding cover 15 Detector (Hall IC)
28 Rotating shaft 36, 37, 38, 39, 40 Abnormal noise suppression member

Claims (5)

A pointer-type instrument that displays the speed of the vehicle, a circuit board that is electrically connected to the pointer-type instrument, a detected object that rotates together with a rotating shaft that transmits rotation associated with the speed of the vehicle, and the detected object And a magnetic shielding cover made of a magnetic material that surrounds the periphery of the detected object and rotates with the rotation of the rotation shaft, and the detected object and the magnetic shielding cover. An instrument device characterized in that an abnormal noise suppressing member is provided between the two. The instrument device according to claim 1, wherein the noise suppressing member is an elastic member. The instrument device according to claim 1, wherein the noise suppression member is made of a resin filler. The instrument device according to claim 1, wherein the noise suppressing member is made of an annular rubber material. The instrument device according to claim 1, wherein the noise suppressing member is made of an annular resin material.

Images