JPH08152440A - Indicating instrument - Google Patents

Abstract

PURPOSE: To provide an indicating instrument in which a case of a movement and a coil bobbin can be integrated easily by a simple operation. CONSTITUTION: A plurality of fixing protrusions 19 are formed integrally at the outer circumferential part of a coil bobbin 3 on which a coil of a movement 1 is wound in such a way that they are extended downward at prescribed intervals in the circumferential direction. A plurality of holes 17 for fixation are made in positions corresponding to the fixing protrusions 19 at the bottom peripheral edge part of a case 2 for the movement 1. Fixing places 18 are formed integrally at peripheral edge parts of the respective holes for fixation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indicator instrument such as a cross coil indicator instrument, and more particularly to an indicator instrument suitable for a speedometer of an automobile.

[0002]

2. Description of the Related Art Conventionally, a magnet rotor is caused to flow in a direction of a synthetic magnetic field in which magnetic fields generated by the pair of coils are combined by passing a current that changes according to a measured amount through a pair of coils that generate magnetic fields intersecting with each other. Rotate
A cross-coil type in-vehicle indicating instrument in which a measurement amount is displayed by a pointer rotating together with the magnet rotor is often used.

FIG. 5 shows such a conventional cross-coil type indicating instrument. The movement 1 of the indicating instrument is as follows.
It has a cylindrical case 2 which is made of a magnetic material and has an open upper end so as to have a magnetic shielding effect. Inside this case 2, a coil bobbin 3 is housed. Two coils 4 are wound around the coil bobbin 3 so as to be orthogonal to each other. The coil bobbin 3 has a disk-shaped magnet rotor 5 arranged inside each of the coils 4.
A rotary shaft 6 attached to the center of the is rotatably arranged. Further, a plurality of holding portions 7 extending in the vertical direction are formed on the outer peripheral portion of the coil bobbin 3, and inside each of these holding portions 7, a fixing terminal which also penetrates the bottom surface of the case 2 is fixed. The bolt 8 is screwed.

Movement 1 constructed as described above
Is arranged on the upper surface of a printed wiring board 9 on which a wiring pattern (not shown) is formed so that the fixing bolt 8 projects to the lower surface side of the wiring board 9, and a fixing nut 10 is attached to the lower end of the fixing bolt 8. By screwing together, the case 2 and the coil bobbin 3 are fixed, and the movement 1 is fixed to the wiring board 9.

FIG. 6 shows another conventional cross-coil type indicating instrument. Two coils 4 are wound inside the case 2 of the movement 1 of the indicating instrument so as to be orthogonal to each other. A coil bobbin 3 is housed therein, and a rotating shaft 6 attached to the center of a disk-shaped magnet rotor 5 arranged inside each of the coils 4 is rotatably arranged in the coil bobbin 3. . Further, a holding flange 11 projecting outward from the case 2 is integrally formed at a diametrically symmetrical position of a peripheral edge portion of the coil bobbin 3, and the coil bobbin 3 and the case 2 are bottom surfaces of the case 2. The portions are integrally fixed by welding 12.

Movement 1 constructed as described above
Is arranged so that the holding flange 11 abuts on the back side of the dial 13 on which predetermined characters, scales, etc. are formed, and the fixing screw 14 is attached to the holding flange 11 from the front side of the dial 13. The movement 1 is fixed to the back side of the dial 13 by tightening. Then, the dial 1 at the tip of the rotary shaft 6
A pointer 15 is attached to the front surface side of 3.

[0007]

However, in the conventional indicating instrument shown in FIG. 5, the fixing bolt 8 screwed into the holding portion 7 of the coil bobbin 3 is arranged so as to project to the lower surface side of the wiring board 9. Then, the case 2 and the coil bobbin 3 are fixed to each other and the movement 1 is fixed to the wiring board 9 by screwing a fixing nut 10 to the lower end portion of the fixing bolt 8, and is shown in FIG. In the cross coil type indicating instrument, the case 2 and the coil bobbin 3 are welded by welding on the bottom surface of the case 2.
And are fixed together.

Therefore, the case 2 and the coil bobbin 3 are
There is a problem in that the work of fixing and is extremely troublesome, the workability of assembling the device is extremely poor, the work process and the number of parts are increased, and the manufacturing cost is also increased. .

Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide an indicating instrument in which the case of the movement and the coil bobbin can be easily integrated by a simple operation. is there.

[0010]

In order to achieve the above-mentioned object, an indicating instrument according to the present invention has a coil wound inside a case whose upper end is opened and which is rotated by energizing this coil. In an indicating instrument having a movement that accommodates a coil bobbin that supports a driven rotating shaft, a plurality of fixing protrusions are integrally formed on the outer peripheral portion of the coil bobbin so as to extend downward at predetermined intervals in the circumferential direction. Then, a plurality of fixing holes are formed at positions corresponding to the fixing protrusions on the peripheral portion of the bottom surface of the case, and fixing pieces are integrally formed on the peripheral portions of these fixing holes. Is.

Further, preferably, a taper surface is formed on the lower portion of the case, the peripheral corners of which are inclined, and the fixing hole is formed in the taper surface. Further, the fixing piece is formed so as to protrude toward the center of the fixing hole, and the tip portion thereof is formed in an acute angle shape.

[0012]

According to the indicating instrument of the present invention, by inserting the lower end portion of the fixing protrusion of the coil bobbin into the fixing hole of the case, the fixing piece is brought into pressure contact with the outer peripheral surface of the fixing protrusion. When attempting to pull out the coil bobbin, the tip of the fixing piece bites into the outer peripheral surface of the fixing protrusion, so that the fixing protrusion does not come out from the fixing hole, which allows the coil bobbin to move inside the case. It can be fixed.

[0013]

Embodiments of the present invention will now be described with reference to FIGS. 1 to 4. The same parts as those of the conventional one described with reference to FIGS. The detailed description thereof will be omitted.

FIGS. 1 to 3 show an embodiment of the movement of the indicating instrument according to the present invention applied to a cross coil type indicating instrument. The movement 1 of the indicating instrument has a cylindrical shape with an open upper end. In the present embodiment, a tapered surface 16 is formed at the lower part of the case 2 in which the peripheral corner portions are formed in an inclined shape. Further, the taper surface 16 has a plurality of fixing holes 17, 17
Are bored so as to have a predetermined interval in the circumferential direction,
On the outer peripheral side of the peripheral portion of each of the fixing holes 17, there is integrally formed a fixing piece 18 projecting toward the center of the fixing hole 17 and having a sharp-edged tip.

A coil bobbin 3 in which two coils (not shown) are wound so as to be orthogonal to each other is housed inside the case 2. The coil bobbin 3 is arranged inside each of the coils. A rotary shaft 6 attached to the center of the disk-shaped magnet rotor 5 is rotatably supported. A plurality of fixing protrusions 19 (four in the illustrated case) are integrally formed on the outer peripheral portion of the coil bobbin 3 so as to extend downward. The lower end surface of each of the fixing protrusions 19 has a coil bobbin. An inclined surface 20 is formed so that the center side of 3 projects. Further, an engagement step portion 21 having a large upper diameter is formed on the center side surface of the coil bobbin 3 on the lower outer peripheral surface of each fixing projection 19.

In the structure of this embodiment, the fixing hole 17
Since the fixing piece 18 protruding toward the center of the taper and having the tip formed in an acute angle is integrally formed on the outer peripheral side of the peripheral edge of the fixing hole formed in the tapered surface 16, no additional processing is required. However, since it is inclined with respect to the insertion direction of the fixing projection 19 into the fixing hole 17, the molding cost of the case 2 does not increase.

Next, the case where the coil bobbin 3 is mounted on the case 2 in this embodiment will be described.

First, the coil bobbin 3 is inserted from the upper opening side of the case 2, and the fixing protrusion 1 of the coil bobbin 3 is inserted.
When the lower end of 9 is inserted into the fixing hole 17 of the case 2, the fixing protrusion 19 pushes the fixing piece 18 of the fixing hole 17 downward or scrapes the surface of the fixing protrusion 19. . Then, the coil bobbin 3 is further pushed inside the case 2, and the fixing protrusion 19 is inserted until the engaging stepped portion 21 abuts the bottom surface of the case 2, whereby the coil bobbin 3 is accommodated inside the case 2. .

In this state, the fixing piece 18 is fixed to the fixing projection 1.
When the coil bobbin 3 is to be pulled out, the tip portion of the fixing piece 18 bites into the outer peripheral surface of the fixing projection 19, so that the fixing projection 19 is fixed to the fixing hole 17 Therefore, the coil bobbin 3 can be fixed to the inside of the case 2 without coming off. In this case, in this embodiment, since the tapered surface 16 is formed on the case 2 and the inclined surface 20 is formed on the fixing projection 19, the fixing projection 19 is applied to the fixing hole 17 with a small force. It can be easily inserted.

The movement 1 having the coil bobbin 3 fixed to the inside of the case 2 is attached to the back side of a dial (not shown).

Therefore, in this embodiment, the lower end of the fixing protrusion 19 of the coil bobbin 3 is inserted into the fixing hole 17 of the case 2, and the fixing piece 18 of the fixing hole 17 is moved downward by the fixing protrusion 19. By bending to
Since the fixing piece 18 is pressed against the outer peripheral surface of the fixing projection 19 to prevent the fixing projection 19 from coming off from the fixing hole 17, the coil bobbin 3 can be simply inserted into the case 2 and the case 2 The coil bobbin 3 and the coil bobbin 3 can be integrally fixed, the working efficiency can be remarkably improved, the number of parts can be reduced, and the manufacturing cost can be remarkably reduced.

FIG. 4 shows another embodiment of the present invention. A plurality of fixing holes are formed in the vicinity of the outer periphery of the bottom surface of the case 2 formed in a flat shape without forming a tapered surface on the case 2. 17
Is to be bored. A fixing piece 18 is formed on the peripheral portion of the fixing hole 17 so as to project downward by means such as cutting or driving. The other parts are the same as those in the above-mentioned embodiment, and therefore their explanations are omitted.

In this embodiment, the fixing piece 18 is formed in the fixing hole 17 of the case 2 and it is necessary to bend the fixing piece 18 downward by an additional process, which requires a larger number of processing steps as compared with the embodiments shown in FIGS. However, in the present embodiment as well as in the above-described embodiment, by pressing the lower end portion of the fixing protrusion 19 of the coil bobbin 3 into the fixing hole 17 of the case 2, the fixing piece 18 is moved to the outer periphery of the fixing protrusion 19. Since it comes into pressure contact with the surface, the fixing projection 19 does not come off from the fixing hole 17, whereby the coil bobbin 3 can be fixed inside the case 2.

Therefore, also in this embodiment, the fixing projection 19 can be prevented from coming off from the fixing hole 17, and the case 2 and the coil bobbin 3 can be integrated by only inserting the coil bobbin 3 into the case 2. The work efficiency can be significantly improved and the manufacturing cost can be significantly reduced.

[0025]

As described above, in the indicating instrument according to the present invention, by inserting the lower end portion of the fixing protrusion of the coil bobbin into the fixing hole of the case, the fixing piece is brought into pressure contact with the outer peripheral surface of the fixing protrusion. Since the fixing protrusion is prevented from coming off from the fixing hole, the case and the coil bobbin can be integrally fixed by simply inserting the coil bobbin into the case, and the working efficiency can be significantly improved. Moreover, the number of parts can be reduced, and the manufacturing cost can be remarkably reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a movement of an indicating instrument according to the present invention.

FIG. 2 is a bottom view of the case with the coil bobbin of FIG. 1 removed.

FIG. 3 is an enlarged sectional view of a fixing hole portion of FIG.

FIG. 4 is an enlarged sectional view of a fixing hole portion showing another embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a conventional indicating instrument.

FIG. 6 is a vertical sectional view showing another conventional indicating instrument.

[Explanation of symbols]

 1 Movement 2 Case 3 Coil bobbin 16 Tapered surface 17 Fixing hole 18 Fixing piece 19 Fixing protrusion 21 Engaging step

Claims (3)

[Claims] 1. An indicator instrument having a movement, in which a coil is wound inside a case having an open upper end, and a coil bobbin supporting a rotating shaft which is rotationally driven by energizing the coil is housed. In the above, a plurality of fixing protrusions are integrally formed on the outer peripheral portion of the coil bobbin so as to extend downward with a predetermined interval in the circumferential direction, and a plurality of fixing protrusions are provided at positions corresponding to the fixing protrusions on the peripheral edge of the bottom surface of the case. An indicating instrument characterized in that fixing holes are formed, and fixing pieces are integrally formed on the peripheral portions of these fixing holes. 2. A taper surface formed by sloping peripheral edge corners is formed in a lower portion of the case, and the fixing hole is formed in the taper surface. Indicator instrument. 3. The indicating instrument according to claim 1, wherein the fixing piece is formed so as to protrude toward the center of the fixing hole, and the tip portion thereof is formed in an acute angle shape.