WO2017110521A1

WO2017110521A1 - Eddy current type instrument

Info

Publication number: WO2017110521A1
Application number: PCT/JP2016/086708
Authority: WO
Inventors: 健志笛吹; 田中　智幸; 岩橋　優
Original assignee: 日本精機株式会社
Priority date: 2015-12-25
Filing date: 2016-12-09
Publication date: 2017-06-29
Also published as: CN108474675A; CN108474675B; JPWO2017110521A1; JP6747454B2

Abstract

Provided is an eddy current type instrument having an accumulator in which gears installed on character wheels are less likely to disengage. An eddy current type instrument 10 comprises: a rotor 23; an accumulator 12 that indicates a travel distance by causing a character wheel 12a to rotate on the basis of rotation of the rotator 23; and a casing 40 that pivotally supports the rotor 23 and the character wheel 12a. A thermoplastic synthetic resin material is applied to the casing 40, a housing section 43 for housing the accumulator 12 is provided to the casing 40, and a gear 12b for a carry of the character wheel 12a is provided between a rotating shaft 17 of the character wheel 12a and the opposing surface of the housing section 43.

Description

Eddy current instrument

The present invention relates to an eddy current type instrument, and is suitable, for example, as an eddy current type instrument equipped with an integrating meter that displays the total travel distance and section distance of a vehicle.

Vehicles are usually equipped with instruments such as speedometers and tachometers. 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 damper mechanism for suppressing rapid rotation of the second rotating shaft and the rotor. The pointer visually recognized by the occupant is provided at the upper end of the second rotation shaft.

Further, an integrating meter composed of a plurality of character wheels for displaying the total travel distance and section distance applied to these instruments is attached by being crimped to a metal frame. For example, it is disclosed in Patent Document 2 Has been.

JP 2000-162225 A JP 2014-120048 A

The integrator of the eddy current type instrument disclosed in Patent Documents 1 and 2 is exposed around the character wheel. Display the accumulator using a tool inserted from the exposed area around the accumulator to disengage the gears on the dial wheel that controls the carry of the dial wheel and change the display value of the accumulator. There was a risk that the value would be altered.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an eddy current type instrument having an accumulator that is difficult to disengage a gear provided on a character wheel.

The eddy current measuring instrument 10 according to the present invention includes a rotating body 23, an accumulator 12 that displays the travel distance by rotating the character wheel 12a based on the rotation of the rotating body 23, the rotating body 23, and the character wheel 12a. An eddy current type instrument having a casing 40 that pivotally supports the casing 40. The casing 40 is made of a thermoplastic synthetic resin material and is provided in the casing 40. A housing portion 43 for housing is provided, and a gear 12b that controls the carry of the character wheel 12a is provided between the opposing surface of the housing portion 43 and the rotary shaft 17 of the character wheel 12a.

The gear 12b is provided on the side 12e opposite to the display surface 12d of the accumulator 12 of the character wheel 12a.

A pointer instrument S that drives the pointer 11 based on the rotation of the rotating body 23 is provided, and the accommodating portion 43 includes

wall portions

43a and 43b between the accumulator 12 and the pointer instrument S, and the digit of the character wheel 12a. The gear 12b that controls the rising is provided between the

wall portions

43a and 43b and the rotating shaft 17.

The gear 12b is provided on the surface 12f side which is rotated 90 degrees around the rotation shaft 17 toward the housing portion with respect to the display surface 12d of the accumulator 12 of the character wheel 12a.

According to the present invention, it is possible to provide an eddy current type instrument having an integrating meter that is difficult to disengage the gears provided on the character wheel.

It is a side view of an eddy current type instrument showing one embodiment of the present invention. It is sectional drawing of the state which looked at the eddy current type instrument shown by FIG. 1 from the left side. It is a principal part enlarged view of the eddy current type meter shown by FIG. It is the figure of the state which looked at the eddy current type instrument shown by FIG. (A) Enlarged view of the main part immediately after placing the accumulator around the protrusion shown in FIG. 4, (b) Enlarged view of the main part after fixing the accumulator, (c) After fixing the accumulator (with the protrusion It is a principal part enlarged view of the case of welding. It is a principal part enlarged view of a piece part, an elastic piece, and a shaft. It is a principal part enlarged view which shows the relationship between the integrating | accumulating meter 12 and the character wheel 12a. (A) The figure which shows the surface of the lower digit side of the character wheel 12a, (b) The figure which shows the surface of the upper digit side of the character wheel 12a.

Hereinafter, an eddy current instrument according to an embodiment of the present invention will be described with reference to the accompanying drawings, taking as an example one mounted on a motorcycle. In the description, left and right refer to the left and right with reference to the occupant who has boarded 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 viewed from the left side. A pointer 11 and a cover are attached to the instrument main body 10. For example, the instrument 11 is mounted on a two-wheeled vehicle and used as a vehicle speedometer (pointer instrument) S having the pointer 11. Further, 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 the vehicle speedometer S, the accumulator 12, the bearing body 20, the base 30 into which the bearing body 20 is inserted, the lid (housing) 40 that covers the base 30, and these. And parts provided on the base 30 and the lid 40.

The accumulator 12 is inserted through a shaft (rotating shaft) 17 and rotates a plurality of character wheels 12a on which numerical values are printed via a gear according to rotation of a first rotating shaft (rotating body) 23 described later. Thus, the distance traveled can be expressed numerically. A pinion holder 12c is provided between the plurality of character wheels 12a, and a pinion gear (gear) 12b is rotatably provided on the pinion holder 12c. In addition, a mechanism for controlling carry is provided, and among the adjacent character wheels 12a, when the character wheel 12a corresponding to the lower digit rotates once (added by 1 as a numerical value and becomes 9 to 0), the pinion holder The numerical value of the character wheel 12a corresponding to the upper digit is added by 1 by the pinion gear 12b provided in 12c. The structure of the character wheel 12a, the pinion gear 12b, and the pinion holder 12c is common to each digit.

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 base 30 is, for example, a base plate configured by press forming a general 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 tubular member 21 and the ring member 32 can be integrated to reduce the number of parts.

A cup-shaped magnetic conductor 24 and a donut-shaped magnet 25 are fixed to the upper part 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 beaten downward, and a second bearing 26 is disposed at the beaten portion.

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 lid 40 is, for example, an injection-molded product by injection molding, and includes a second wall portion 41 that extends upward from the end portion of the base portion 30 and a ceiling portion 42 that covers an upper portion surrounded by the second wall portion 41. And consist of 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.

The housing portion 43 is provided with a bottom surface portion (wall portion) 43a and a back surface portion (wall portion) 43b between the vehicle speed meter S and the shaft 17. The pinion gear 12b provided in the pinion holder 12c is provided between the shaft 12 and the surface 12e opposite to the display surface 12d of the accumulator 12, that is, the surface 12e facing the bottom surface portion 43a. Since the pinion gear 12b is covered with the bottom surface portion 43a and the back surface portion 43b, even if a tool is inserted from the exposed portion around the accumulator 12 that is not covered with the bottom surface portion 43a and the back surface portion 43b, the pinion gear 12b is linear. Cannot be touched and it is difficult to remove the pinion gear 12b.

A circular support hole 44 is formed on the axis CL of the first rotation 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 rotation shaft 45 is rotatably supported by the lid body 40 in a state in which the second rotation shaft 45 is in contact with the inner peripheral surface of the support hole 44. The lower end of the second rotating shaft 45 is rotatably supported by the second bearing 26.

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.

A whisker spring 46 that biases the second rotating shaft 45 is provided above the ceiling portion 42. 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 biases the second rotating shaft 45 in a direction opposite to the direction of rotation of the rotor 60 due to eddy current.

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

The right accumulator support portion 80 includes a shaft hole (not shown) that supports one end of the shaft 17. The left integrator support portion 70 extends in the vertical direction to support the other end of the shaft 17, and presses the U-shaped groove portion 71 and the shaft 17 supported by the shaft hole against the U-shaped groove portion 71. An elastic piece 72 is provided.

The left counter 70 is provided with a protruding portion (one portion) 71a along the direction in which the U-shaped groove 71 extends. The protrusion 71a is formed thinner than other parts. After the integrating meter 12 is placed from above the U-shaped groove 71, the tip of the protrusion 71a is thermally deformed so that the gap Wd of the protrusion 71a is narrower than the diameter Dd of the shaft 17. FIG. 5A shows a state around the protrusion 71a when the accumulator 12 is placed, and FIGS. 5B and 6 show a state around the protrusion 71a after thermal deformation.

In the present embodiment, the example in which the gap Wd of the protrusion 71a is narrowed after the accumulator 12 is placed has been described. However, as shown in FIG. 5C, no gap is provided, and the protrusion 71a is further provided. It can be welded.

Also, by providing the elastic piece and the holding portion (protruding portion) with a fragile portion that is thinner than the portion in contact with the rotating shaft of the accumulator, an anti-tampering action can be expected.

By adopting such a structure, the portion provided with the pinion gear 12b of the accumulator 12 is covered with the bottom surface portion 43a and the back surface portion 43b. Therefore, it is difficult to disengage the pinion gear 12b from the outside when the accumulator 12 is assembled. Further, it is conceivable to change the display value of the accumulator 12 by removing the character wheel 12a. However, when the accumulator 12 is removed and tampered with, the accumulator Since the tamper mark 12 can be identified, unauthorized modification or tampering can be prevented.

In the present embodiment, the right-hand integrator support portion 80 is provided with a shaft hole. However, the left-hand integrator support portion 70 may have the same structure, or the left and right integrator-support portions may be reversed. There is no problem. The direction in which the elastic piece 72 is engaged with the shaft 17 and the tip portion of the protrusion 71a that is thermally deformed are provided in the same direction (Up side), so that the product is directed in the same direction in the manufacturing process. Since the integrator 12 can be assembled and held as it is, it is effective and the assembly process can be automated.

The instrument body 10 includes a damper mechanism 19 for suppressing the second rotation shaft 45 and the rotor 60 from rotating rapidly. Hereinafter, the damper mechanism 19 will be described.

The damper mechanism 19 includes an oil cup 52 that is filled with oil 51 and is rotatable together with the second rotating shaft 45, a resistance portion 49 that extends from the lid body 40 to the oil cup 52, and a tip portion 48 is immersed in the oil 51. Have. In addition, the wall part which consists of the bottom face part 43a and the back part 43b also has the effect | action which prevents the oil 51 from penetrating into the integrating | accumulating meter 12. FIG.

In the center of the rotor 60, an insert hole 61 for insert-molding the rotor support portion 50 is formed. The upper edge 62 that is the edge on the upper surface side of the insert hole 61 is chamfered.

The rotor support portion 50 includes a lower surface portion 53 that supports the lower surface side of the rotor 60, a main body portion 54 that extends from the center of the lower surface portion 53 along the second rotation shaft 45, and an upper surface that supports the upper surface side of the rotor 60. Part 55. From the upper surface portion 55, a support portion reinforcing portion 58 extends upward along the second rotation shaft 45.

The oil cup 52 has a cylindrical shape and is integrally provided on the upper surface portion 55 of the rotor support portion 50.

The oil cup 52 is surrounded by an oil reservoir 56 that accumulates oil spilled from the oil cup 52. The oil reservoir 56 has an annular groove 56 a for storing oil, and is integrally provided on the upper surface 55 of the rotor support 50. The oil reservoir 56 is provided on the edge of the upper surface 55 of the rotor support 50.

In the present embodiment, the oil reservoir 56 and the annular groove 56a are formed by extending the edge of the upper surface portion 55 upward. For example, the upper surface portion is located closer to the inner periphery than the edge of the upper surface portion 55. An oil reservoir and an annular groove may be formed by forming an annular recess in 55.

The width W1 of the annular groove 56a is smaller than the distance D from the tip of the oil reservoir 56 to the lid 40.

The resistance portion 49 is formed integrally with the lid body 40. The distal end portion 48 of the resistance portion 49 extends to the vicinity of the upper surface portion 55 of the rotor support portion 50. The distal end portion 48 is provided so as to surround the support portion reinforcing portion 58.

The width W2 from the resistance portion 49 to the second rotation shaft 45 includes a portion wider than the width W3 from the distal end portion 48 of the resistance portion 49 to the support portion reinforcement portion 58. Similarly, a width W2 from the resistance portion 49 to the second rotation shaft 45 includes a portion wider than a width W4 from the tip portion 48 to the oil cup 52.

The vehicle speed meter S includes a first rotating shaft 23, a magnetic conductor 24, a magnet 25, a rotor 60, a second rotating shaft 45, and a pointer 11, and when the motorcycle travels, the first rotation is performed in conjunction with the rotation of the front wheels. The shaft 23 rotates, and the magnetic conductor 24 and the magnet 25 fixed to the first rotating shaft 23 rotate integrally. Due to the rotation of the magnet 25, an eddy current is generated in the rotor 60 and the rotor 60 rotates. The pointer 11 (see FIG. 1) is displaced together with the second rotating shaft 45 by 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 force of the rotor 60 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.

The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the present embodiment, the pinion gear 12b is provided between the shaft 17 and the surface 12e on the opposite side of the display surface 12d of the accumulator 12. However, the housing 43 (rear surface) is disposed on the display surface 12d of the accumulator 12. It may be provided between the shaft 17 and the surface 12f rotated 90 degrees around the axis of the shaft 17 on the side of the portion 43b). The pinion gear 12b may be provided between the surface 12e and the surface 12f and the shaft 17, and it is more preferable that the pinion gear 12b be provided at a position where it cannot be seen from the exposed portion of the integrating meter 12.

Further, although the accumulator 12 is provided above the second rotating shaft 45 (the traveling direction of the two-wheeled vehicle), it may be provided below the second rotating shaft 45 (on the driver side).

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

10 Instrument body (eddy current type instrument)
11 Pointer 12 Accumulator 12a Character wheel 12b Pinion gear (gear)

12c Pinion holder

12d Display surface 12e Surface on the opposite side of the display surface 12f Surface rotated 90 degrees toward the receiving section with respect to the display surface 15 Horizontal axis 16 Gear mechanism 17 Shaft (rotary axis)
DESCRIPTION OF SYMBOLS 19 Damper mechanism 20 Bearing body 21 Cylindrical member 22 Sliding bearing 23 1st rotating shaft (rotating body)
24 Magnetic Conductor 25 Magnet 26 Second Bearing 30 Base 31 Insertion Hole 32 Ring Member 40 Lid (Housing)
41 2nd wall part 42 ceiling part 43 accommodating part 43a bottom face part (wall part)
43b Back side (wall)
44 Support Hole 45 Second Rotating Shaft 46 Spring 47 Hook 48 Tip 49 Resistor 50 Rotor Support 51 Oil 52 Oil Cup 53 Lower Face 54 Main Body 55 Upper Face 56 Oil Reservoir 56a Annular Groove 58 Support Reinforcement 59 Boundary part 60 Rotor 61 Insert hole 62 Upper edge 70 Left counter support part 71 U-shaped groove part 71a Projection part (single part)
72 Elastic piece 80 Right counter support part S Pointer instrument Dd Diameter of shaft 17 Wd Clearance of protrusion

Claims

A rotating body; an accumulator that displays a travel distance by rotating the character wheel based on the rotation of the rotating member; and a housing that pivotally supports the rotating member and the character wheel. An eddy current instrument,
The casing is made of a thermoplastic synthetic resin material,
Provided in the housing, provided with an accommodating portion for accommodating the accumulator,
The gear that controls the carry of the character wheel,
An eddy current type instrument provided between a surface facing the housing and a rotating shaft of the character wheel.
The eddy current instrument according to claim 1, wherein the gear is provided on a side opposite to a display surface of the accumulator of the character wheel.
A pointer instrument for driving the pointer based on the rotation of the rotating body,
The accommodating portion has a wall portion between the accumulator and the pointer instrument,
The eddy current type instrument according to claim 1, wherein a gear for controlling a carry of the character wheel is provided between the wall portion and the rotating shaft.
2. The eddy current according to claim 1, wherein the gear is provided on a surface side that is rotated 90 degrees toward the housing portion about the rotation axis with respect to a display surface of the accumulator of the character wheel. Type instrument.