JP2018080917A - Eddy current type gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eddy current type gauge which can assemble workability well and eventually reduce manufacturing cost.SOLUTION: An eddy current type gauge 10 includes a base portion 30, a lid body 40 covering the base portion 30, a first rotating shaft 23 rotatably supported by the base portion 30, a magnet 25 attached to the first rotating shaft 23 and rotating together with the first rotating shaft 23, a second rotating shaft 45 rotated on the same axis CL as the first rotating shaft 23 and axially supported by the lid body 40, and a rotor 60 rotated by an eddy current generated when the magnet 25 is rotated and supported by the second rotating shaft 45. An insertion hole 27 having a sphere 28 is provided at an end portion of the first rotation shaft 23 so that the second rotary shaft 45 is rotatably supported by abutting against the sphere 28.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an eddy current type instrument.

  A vehicle is usually equipped with instruments such as a speedometer and a tachometer. As these instruments, there is known an eddy current type instrument in which a pointer is rotated by an eddy current generated when a magnet is rotated. As a conventional technique related to an eddy current type instrument, there is a technique disclosed in Patent Document 1.

  As shown in Patent Document 1, an eddy current type instrument has a base, a lid placed on the base, a first rotary shaft rotatably supported on the base, and the first rotary shaft. A magnet that is attached and rotates together with the first rotation shaft, a second rotation shaft that is rotatably attached to the lid, and rotation by an eddy current that is generated when the magnet is supported by the second rotation shaft. And a rotor.

JP 2000-162225 A

  However, the conventional eddy current type instrument includes a tray and a lower bearing as parts for supporting the second rotating shaft, and prevents needle deflection of the pointer due to misalignment of the second rotating shaft. In addition, it was necessary to manage the insertion accuracy of the lower bearing and the accuracy of caulking.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an eddy current type instrument that has good assembling workability and can reduce the manufacturing cost.

The eddy current type instrument 10 according to the present invention includes:
A base 30;
A lid 40 covering the base 30;
A first rotating shaft 23 rotatably supported by the base 30;
A magnet 25 attached to the first rotating shaft 23 and rotating together with the first rotating shaft 23;
A second rotating shaft 45 that rotates on the same axis CL as the first rotating shaft 23 and is pivotally supported by the lid 40;
A rotor 60 that is supported by the second rotating shaft 45 and rotates by eddy current generated when the magnet 25 rotates;
With
An insertion hole 27 having a sphere 28 is provided at the end of the first rotation shaft 23,
The second rotating shaft 45 is characterized in that the second rotating shaft 45 is rotatably supported by coming into contact with the sphere 28.

  The second rotating shaft 45 is characterized in that an end portion thereof is inserted into the insertion hole 27 and is pivotally supported by an inner wall 27 a of the insertion hole 27.

  According to the present invention, it is possible to provide an eddy current type instrument that has good assembly workability and can be reduced in manufacturing cost.

The eddy current type meter which shows one Embodiment of this invention. AA sectional drawing of the eddy current type instrument shown by FIG. The principal part enlarged view of the insertion hole vicinity of FIG. The figure which shows another example of embodiment same as the above.

  Hereinafter, an eddy current instrument according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the description, left and right refer to the left and right with reference to the occupant of the motorcycle, and front and rear refer to the front and rear with reference to the traveling direction of the motorcycle. In the figure, Fr indicates the front, Rr indicates the rear, Le indicates the left when viewed from the occupant, Ri indicates the right when viewed from the occupant, Up indicates the upper side, and Dn indicates the lower side.

  FIG. 1 shows an instrument body (eddy current instrument) 10 of an eddy current instrument according to the present invention as seen from above. A pointer 11 and a cover are attached to the instrument body 10, and are mounted on a two-wheeled vehicle, for example, and used as a vehicle speedometer. An accumulator 12 for displaying the accumulated travel distance is provided in front of a rotation shaft (second rotation shaft) 45 to which the pointer 11 is attached. The pointer 11 and the accumulator 12 operate in conjunction with the rotation of the front wheel of the motorcycle. Hereinafter, the details of the meter body 10 will be described.

  The meter body 10 includes a bearing body 20, a base 30 into which the bearing body 20 is inserted, a lid (housing) 40 that covers the base 30, and parts that are provided on the base 30 and the lid 40. It consists of.

  The accumulator 12 is inserted into the shaft 17 and rotates a plurality of character wheels 12a on which numerical values are printed via a gear according to the rotation of a first rotating shaft 23 described later, thereby expressing the traveling distance as a numerical value. it can.

  The bearing body 20 includes a cylindrical member 21 and a sintered bearing 22 made of sintered metal provided on the inner periphery of the cylindrical member 21. A first rotary shaft 23 is rotatably provided on the inner periphery of the slide bearing 22.

  The first rotating shaft 23 is connected to a cable C that rotates in conjunction with a vehicle wheel on which the instrument body 10 is mounted. A cup-shaped magnetic conductor 24 and a donut-shaped magnet 25 are fixed to the upper portion of the first rotating shaft 23. That is, the magnetic conductor 24 and the magnet 25 can rotate together with the first rotating shaft 23. The magnetic conductor 24 opens upward. The magnet 25 is disposed so as to be accommodated in the magnetic conductor 24 opened upward. As the magnet 25, for example, a radially magnetized sintered magnet made of Al-Ni-Co is used. The upper end of the first rotating shaft 23 is provided with an inclined surface 26 that is bent downward in a mortar shape, and further has a cylindrical insertion hole 27. A stainless steel sphere 28 is press-fitted into the insertion hole 27 and is rotatably arranged. The lower end of the second rotating shaft 45 is pivotally supported in the thrust direction by the wall portion (inner wall) 27a of the insertion hole 27 and the sphere 28, and is rotatable. Moreover, the diameter of the insertion hole 27 and the diameter of the spherical body 28 are substantially equal, and the diameter of the 2nd rotating shaft 45 is formed a little smaller than both.

  A horizontal shaft 15 that meshes with the first rotating shaft 23 is provided below the magnetic conductor 24. The horizontal shaft 15 is rotatably supported by the base 30 (see FIG. 1). The horizontal axis 15 is orthogonal to the first rotation axis 23 and constitutes a part of the gear mechanism 16 that transmits the rotation of the first rotation axis 23 to the accumulator 12. The gear mechanism 16 employs a known technique such as a worm gear. Detailed description is omitted.

  The base 30 is configured, for example, by press forming a common cold rolled steel plate (SPCC). An insertion hole 31 is formed in the center of the base 30. A ring member 32 is provided on the periphery of the cylindrical member 21. The cylindrical member 21 and the base 30 are fixed by crimping the ring member 32 after inserting the ring member 32 into the insertion hole 31.

  The lid body 40 is, for example, an injection-molded product by injection molding, and includes a wall portion 41 that extends upward from an end portion of the base portion 30 and a ceiling portion 42 that covers an upper portion surrounded by the wall portion 41. The lid 40 can employ polybutylene terephthalate resin (PBT). The ceiling portion 42 is formed with a housing portion 43 for housing the accumulator 12 from substantially the center to the front portion.

  A circular support hole 44 is formed on the axis CL of the first rotating shaft 23 at the approximate center of the ceiling portion 42. That is, the second rotation shaft 45 is disposed on the same axis line CL as the first rotation shaft 23. The second rotating shaft 45 is rotatably supported by the lid body 40 in a state in which the second rotating shaft 45 is in contact with the inner peripheral surface of the support hole 44.

  A synthetic resin rotor support 50 is attached to the second rotating shaft 45. Details of the rotor support 50 will be described later. The rotor 60 supported by the rotor support portion 50 is made of a nonmagnetic metal, for example, aluminum, and is configured in a cup shape by press molding. The cylindrical wall portion of the rotor 60 is located between the magnet 25 and the magnetic conductor 24.

  Above the ceiling portion 42, a whisker spring 46 that biases the second rotating shaft 45 is provided. The whisker spring 46 is hooked on a hook 47 whose center is fixed to the second rotating shaft 45 and whose end is fixed to the ceiling 42. The end is fixed by, for example, heat caulking. The whisker spring 46 urges the second rotating shaft 45 in a direction opposite to the direction of rotation of the rotor 60 by eddy current.

  The lid body 40 includes a right-side integrator support unit 70 and a left-side integrator support unit 80 that support both ends of the shaft (rotating shaft) 17 of the integrator 12.

  The left integrator support portion 80 includes a shaft hole (not shown) that supports one end of the shaft 17.

  When the two-wheeled vehicle travels, the first rotating shaft 23 rotates in conjunction with the rotation of the front wheel, and the magnetic conductor 24 and the magnet 25 fixed to the first rotating shaft 23 rotate integrally. As the magnet 25 rotates, an eddy current is generated in the rotor 60 and the rotor 60 rotates. The indication angle of the pointer 11 is displaced in conjunction with the rotation of the rotor 60. As the speed of the motorcycle increases, the rotational speed of the magnet 25 increases and the eddy current generated in the rotor 60 also increases. As the eddy current increases, the rotational speed of the rotor 60 also increases and the force for rotating the pointer 11 also increases. The pointer 11 stops at a position that balances the urging force of the whisker spring 46. The occupant can visually recognize the traveling speed based on the position indicated by the pointer 11.

  Similarly, the rotation of the first rotating shaft 23 is transmitted to the accumulator 12 via the gear mechanism 16. The occupant can visually recognize the distance traveled by the numbers indicated on the accumulator 12.

  By adopting such a structure, the sphere 28 is guided to the insertion hole 27 so as to roll down the inclined surface 26 to facilitate press-fitting. The end of the second rotating shaft 45 is guided to the insertion hole 27 by the inclined surface 26. When lubricating oil is applied, the inclined surface 26 leads to the bottom surface of the insertion hole 27, and the bottomed insertion hole 27 functions as an oil reservoir. In this way, the second rotation shaft 45 can be supported in the thrust direction by the insertion hole 27 and the sphere 28. At this time, since the contact area between the second rotating shaft 45 and the sphere 28 is small, the second rotating shaft 45 can be easily rotated with respect to the first rotating shaft 23. Therefore, an eddy current meter with good assembly workability can be obtained.

  Furthermore, by supporting the end portion of the second rotation shaft 45 in the radial direction by the wall portion 27 a, the second rotation shaft 45 can be rotated on the same axis line CL as the first rotation shaft 23. .

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, in the above-described embodiment, the sphere 28 is made of stainless steel, but the same effect can be expected even when other metals that do not affect the magnet are used.

  In the above-described embodiment, the case where the sphere 28 is press-fitted is illustrated. However, when the diameter of the sphere 28 is slightly smaller than the diameter of the insertion hole 27 and a gap is provided between them, the sphere 28 is press-fitted. The same effect can be expected even if it is not performed. Further, in this case, since the sphere 28 can rotate in the insertion hole 27, there is an effect that the second rotating shaft 45 can be rotated more smoothly.

  In the above-described embodiment, the case where the accumulator 12 is provided on the lower side (Fr direction in FIG. 1) of the second rotating shaft has been illustrated. However, as shown in FIG. There is no problem even if the structure is provided with a meter.

  The eddy current type instrument of the present invention is also suitable as a speedometer for automobiles, agricultural machines, construction machines, ships, and the like.

10 Instrument body (eddy current type instrument)
DESCRIPTION OF SYMBOLS 11 Pointer 12 Accumulator 12a Dial wheel 15 Horizontal shaft 16 Gear mechanism 17 Shaft 20 Bearing body 21 Cylindrical member 22 Sliding bearing 23 First rotating shaft 24 Magnetic conductor 25 Magnet 26 Inclined surface 27 Insertion hole 27a Wall portion 28 Sphere 30 Base 31 Insertion hole 32 Ring member 40 Lid (housing)
41 Wall portion 42 Ceiling portion 43 Housing portion 44 Support hole 45 Second rotation shaft 46 Spring 47 Hook 50 Rotor support portion 60 Rotor 70 Right side accumulator support portion 80 Left side accumulator support portion C Cable CL Axis line

Claims (2)

The base,
A lid over the base;
A first rotating shaft rotatably supported by the base portion;
A magnet attached to the first rotating shaft and rotating together with the first rotating shaft;
A second rotating shaft that pivots on the same axis as the first rotating shaft and is pivotally supported by the lid;
A rotor that is supported by the second rotating shaft and rotates by eddy current generated when the magnet rotates;
In an eddy current instrument having
An insertion hole having a sphere is provided at an end of the first rotation shaft,
The eddy current instrument, wherein the second rotating shaft is pivotally supported by contacting with the sphere. 2. The eddy current instrument according to claim 1, wherein an end of the second rotating shaft is inserted into the insertion hole and is pivotally supported by an inner wall of the insertion hole.

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