JPH10104028A - Mounting structure for measuring-instrument unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mounting structure by which a measuring-instrument unit composed of a measuring-instrument body provided with a dial can be mounted easily on a circuit board without damaging an electric connecting component by a method wherein a guide wall which guides and houses the measuring-instrument body is installed at a through hole in a case which houses the measuring-instrument unit. SOLUTION: In a case 11, its through hole 13 is provided with a cylindrical guide wall 18 whose diameter is larger than that of a shielding case 8 for a measuring-instrument unit U and which follows the cylindrical shielding case 8. When the measuring-instrument unit U is mounted on a circuit board 12, a measuring-instrument body M comes into contact with the upper end of the guide wall 18, and the measuring-instrument body M is guided into the through hole 13 by a slope 19 at the guide wall 18. Male terminals 14 are inserted into female terminals 15, the measuring-instrument unit U is connected electrically to the circuit board 12, claws 16 at the measuring-instrument unit U are inserted into hole parts on the side of the circuit board 12, the claws 16 are bent, caulked and fixed so as to carry the circuit board 12, and the measuring instrument unit U is connected mechanically to the circuit board 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument unit used for a fuel gauge, a thermometer, a tachometer, a speedometer, a voltmeter, etc., which are mounted on automobiles, motorcycles, agricultural vehicles, ships, etc., and particularly to a mounting structure thereof. It is about.

[0002]

2. Description of the Related Art As shown in FIG.
Is a bobbin case 3 composed of an upper case 1 and a lower case 2.
A disk-shaped magnet 4 having N-poles and S-poles magnetized therein is housed inside the bobbin case 3, and the upper and lower ends of the pointer shaft 5 penetrating vertically above and below the magnet 4 are respectively raised. The magnet 4 is rotatably housed and supported in the bobbin case 3 by being pivotally supported by the case 1 and the lower case 2. The outer periphery of the bobbin case 3 alternately intersects with the coil 6.
Is wound, the magnet 4 follows the direction of the synthetic magnetic field generated according to the amount of current flowing through the coil 6, and an instruction is given by the pointer 7 provided at the tip of the pointer shaft 5 that operates integrally with the magnet 4. . Further, the instrument main body M is provided with a shield case 8 for preventing an influence from an external magnetic field.

In front of the instrument body M, a light guide 9 is provided.
The instrument panel U is constituted by disposing the dial 10. The instrument unit U is housed in a case 11 made of a synthetic resin. Then, below the instrument unit U, a circuit board 12 on which a drive circuit is formed is provided. The instrument unit U and the circuit board 12 are connected via a through hole 13 provided in the case 11. Male terminals on the surface of this circuit board 12
A female terminal 15 having one end connected to the end of the coil 6 and connected to the male terminal 14 on the instrument unit U side.
Are provided, and the male terminal 14 and the female terminal 15 are connected to establish electrical conduction. A nail 16 is provided on the bottom surface of the shield case 8 facing the circuit board 12, while a hole is provided on the circuit board 12 side, and after the nail 16 is inserted into the hole, it is bent. The instrument unit U and its driving circuit board are mechanically fixed by tightening.
12 had been assembled.

[0004]

However, in the above-described mounting structure of the meter unit U, a portion where the meter main body M and the circuit board 12 are connected by the dial 10 or the like (the male terminal 14 and the female terminal 15 are connected to each other). However, there is a problem that the assembling is difficult and the workability is poor because the connection state of the contact cannot be seen. Further, if the attachment fails, the electric connection parts such as the male terminals 14 may be damaged, and the circuit board 12 may be replaced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting structure of an instrument unit which can easily assemble an instrument unit comprising an instrument main body provided with a dial to a circuit board without damaging electrical connection parts. I have.

[0006]

According to the present invention, there is provided an instrument unit having at least a dial on the front surface of an instrument body having an indicator shaft and an indicator unit having an indicator on the indicator shaft, and accommodating the instrument unit and storing the instrument unit. A case having a through hole through which the instrument body penetrates is provided, and a circuit board connected to the instrument body through the through hole and supplying a driving current to the instrument body is provided on the back of the case. The hole is provided with a guide wall in which the instrument main body is guided and stored.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS By providing a guide wall 18 for guiding and storing an instrument main body M in a case 11, a meter unit U in which a dial 10 and a pointer 7 are assembled to the instrument main body M can be connected to the guide wall 18.
While being positioned along the case, it is easily housed in the case 11, and the circuit board 12 and the instrument unit U are electrically connected.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same and corresponding parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 1 to 4 show an embodiment of the present invention. FIG. 1 is a sectional view showing a mounting structure of an instrument unit before assembling, and FIG. 2 is a mounting structure of the meter unit after assembling. FIG. 3 is a cross-sectional view showing a perspective view in which main parts are cut away.
FIG. 4 is a cross-sectional view seen from an angle different from FIG.

The meter body M has a pointer 7 at the end of the pointer shaft 5. Two claws 16 are integrally provided on the bottom surface of the shield case 8 from the shield case 8, while a claws are provided on the circuit board 12. A hole 17 through which the hole 16 can be inserted is provided. Nail
Numeral 16 is provided integrally with the shield case 8 from the shield case 8 at a portion facing the circuit board 12. In this case, a part of the bottom surface of the shield case 8 is cut and raised toward the circuit board 12 and bent. Is formed.

A light guide 9 made of a translucent member and a dial 10 are laminated between the instrument body M and the pointer 7 to form an instrument unit U. A case 11 made of a synthetic resin is provided between the instrument unit U and the circuit board 12. The case 11 has an open front side and accommodates the instrument unit U. The case 11 is provided with a cylindrical guide wall 18 in the through hole 13, which is larger in diameter than the shield case 8 of the instrument unit U and is similar to the cylindrical shield case 8. The upper end of the guide wall 18 has an inclined surface 19 for guiding.

The lower end 19a of the inclined surface 19 is provided so as to be located above the tip of the male terminal 14, so that the male terminal 14 can be smoothly inserted into the female terminal 15 when the instrument unit U is assembled. Has become. Also, the inner diameter D of the female terminal 15
The relationship between the gap d between the guide wall 18 and the shield case 8 when the instrument unit U is assembled on the circuit board 12 is as follows.
Is less than half the inner diameter D. With this setting, the male terminal 14 is securely inserted and connected without coming off the female terminal 15. On the opposite side of the guide wall 18 of the case 11, a cylindrical contact portion 20 that contacts the circuit board 12 is provided.

When the instrument unit U is assembled to the circuit board 12 in this manner, the instrument body M is connected to the guide wall 18.
The instrument body M is guided into the through hole 13 by the inclined surface 19 of the guide wall 18. By inserting the male terminal 14 into the female terminal 15, the electrical connection between the instrument unit U and the circuit board 12 is performed, and the claw 16 of the instrument unit U is inserted into the hole 17 on the circuit board 12 side, By bending the pawl 16, the instrument unit U and the circuit board 12 are mechanically connected while holding the circuit board 12 so as to hold it.

Although the positional relationship between the female terminal 15 of the instrument unit U and the male terminal 14 of the circuit board 12 cannot be visually checked by the dial 10 or the like, the provision of the guide wall 18 makes the instrument unit U invisible. The female terminal 15 and the male terminal 14 are securely connected by guiding the U shield case 8 to an appropriate position and assembling it. Thereby, workability at the time of attaching the instrument unit U is improved. Further, since the electric connection parts such as the male terminals 14 do not come into contact with each other unless the instrument main body M enters the guide wall 18, the electric connection parts such as the male terminals 14 are protected by the guide wall 18 and are not attached during the installation. Damage can be prevented.

Although not shown, a plurality of slits are provided in the cylindrical guide wall 18 so that the guide wall 18 is formed.
Is divided and the guide wall 18 is made elastic so that the shield case 8
Even when the guide wall 18 comes into contact with the guide wall 18, the guide wall 18 bends, and mounting can be performed more smoothly.

In the present invention, the female terminal 15 is provided on the instrument unit U side, the male terminal 14 is provided on the circuit board 12 side, and the female terminal 15 is provided.
Although the description has been given based on a structure in which the male terminal 14 is inserted and fixed to the instrument unit U and the circuit board 12 to electrically connect the instrument unit U to the instrument unit U, one end of the coil 6 is connected to the instrument unit U (not shown). A terminal is provided, and a nut portion is provided at a lower end portion of the terminal, and a screw for energizing is fixed to the nut portion from the back side of the circuit board 12, and a land portion (not shown) formed on the back side of the circuit board 12 is provided. The present invention is also applicable to the case where the electrical connection and the mechanical connection between the meter unit U and the circuit board 12 are performed by bringing the meter unit U into contact with the screw.

In the above embodiment, a cross-coil instrument is used as the instrument body M. However, the instrument body is not limited to a cross-coil instrument, and although not shown, for example, a stepping motor may be used. The same operation and effects as those of the above embodiment can be obtained even when used for the instrument body.

[0018]

As described above, according to the present invention, a cylindrical guide wall for guiding and storing the instrument main body is provided in the case,
The instrument body of the instrument unit in which the dial and hands are assembled to the instrument body can be easily housed in the case along the guide wall, and the circuit board and the instrument body can be electrically connected.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mounting structure of an instrument unit before assembly according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounting structure of the instrument unit after assembly according to the embodiment.

FIG. 3 is a perspective view of the same embodiment with a main part cut away.

FIG. 4 is a sectional view of the same embodiment as seen from an angle different from that of FIG. 2;

FIG. 5 is a cross-sectional view showing a mounting structure of a conventional instrument unit before assembly.

[Explanation of symbols]

 3 Bobbin case 4 Magnet 5 Pointer shaft 6 Coil 7 Pointer 8 Shield case 9 Light guide 10 Letter plate 11 Case 12 Circuit board 13 Through hole 18 Guide wall M Instrument body U Instrument unit

Claims (1)

[Claims] An instrument unit having at least a dial on the front surface of an instrument body having a pointer shaft and an indicator unit having a pointer on the pointer axis is provided. The instrument unit is housed and a through hole through which the instrument body penetrates is provided. A case is provided, and a circuit board connected to the instrument main body through the through hole and supplying a driving current to the instrument main body is provided on the back surface of the case, and the instrument main body is guided and stored in the through hole of the case. A mounting structure for an instrument unit, wherein a guide wall is provided.