JPH0743660Y2 - Crossed coil instrument - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-coil type meter, and more particularly to a cross-coil type meter in which a coil is connected via a connecting wire to a circuit board on which a control circuit is formed.

2. Description of the Related Art Generally, a cross-coil type instrument is configured to generate a magnetic field corresponding to a supplied signal current by a coil and rotate a rotor to which a pointer is attached by the generated magnetic field to perform an index. An example of a conventional crossed coil type instrument is shown in FIGS. 5 to 8.

The cross-coil type instrument is composed of a pointer shaft 2a, a rotor magnet 2b, an upper case 1a ', a lower case 1b', coils 3, 4, a mounting column portion 15, a magnetic shield case 6, and the like. Reference numeral 12 denotes a circuit board, and 11 denotes a screw for fixing the circuit board and the magnetic shield case 6.

The conventional cross-coil type instrument has a structure in which the magnetic shield case 6 largely surrounds the upper case 1a 'and the lower case 1b', and the mounting column portion 15 is arranged outside the magnetic shield case 6 and inside thereof. Is the circuit board 12 and coil
A plurality of connecting wire members 5a to 5d for connecting 3 and 4 were pierced and were connected to the connector 10 soldered to the circuit board 12.

Conventionally, a resin material having high heat resistance is used for the coil bobbin 1'for soldering the coils 3 and 4 to the plurality of connecting wire rods 5a to 5d.

However, in the conventional cross-coil type instrument, the coils 3, 4 are connected to the connecting wires 5a to 5d for connecting the coils 3, 4 to the connector 10.
Therefore, a resin material having a high heat resistance must be used for the coil bobbin 1'for soldering. However, a resin having high heat resistance generally has a problem that the bearing loss is large as a bearing for a small torque and the hysteresis increases with rotation of the pointer shaft 2a.

When a resin with low bearing loss is used, such a resin generally has low heat resistance, so the heat generated during soldering during the assembly process deforms and discolors the stepped column portion 15 and reduces the strength of fixing to the coil bobbin. Therefore, there is a problem in that workability is significantly deteriorated because it is necessary to take care not to apply excessive solder heat to the mounting column portion 15 because quality defects such as disconnection of No. 4 and 4 are likely to occur.

The present invention has been made in view of the above points, and an object thereof is to provide a cross-coil type instrument having a simple structure, low bearing loss, good quality, excellent heat resistance against soldering, and improved workability. To do.

Means for Solving the Problems To solve the above problems, the present invention holds a rotor rotatably and winds a coil around the outer periphery of the rotor, and an outer peripheral portion of the coil winding member. A cross-coil type instrument having a connecting wire for electrically connecting the coil to an external circuit, wherein the instrument is made of a high heat resistant resin material, and an engaged portion is integrally formed on an outer peripheral portion, A connecting wire rod holding member for holding the connecting wire rod, wherein the coil winding member is made of a highly lubricating resin material, and a mounting hole for mounting the connecting wire rod holding member; and an inner peripheral portion of the mounting hole. An engaging portion that engages with the engaged portion when the connecting wire rod holding member is attached to the mounting hole, and that holds the connecting wire rod holding member on the coil winding member, is integrated with the coil winding member. As the structure formed in It made.

According to the present invention, the connection wire is held by the connection wire holding member made of a high heat-resistant resin material, and the fitting portion of the connection wire holding member is attached to the outer periphery of the coil winding member. A connection that holds the connection member even if a large amount of heat is applied to the connection wire after fixing the relative position between the connection wire and the coil by engaging the engaging portion of the hole with the coil winding member. Since the member holding member is a highly heat-resistant resin material, there is no deformation around the connecting wire and relatively large heat can be applied when soldering the coil and the connecting wire, thus improving the work efficiency of soldering. Can be improved and connection can be performed reliably, and since the coil winding member can be made of a highly lubricious resin material that is weak against heat, it is possible to reduce bearing loss with respect to rotation of the rotor, and to improve the rotor Realize the action In addition, since the connecting wire rod can be held by the coil winding member after being held by the connecting wire rod holding member, if the connecting wire rod is assembled in the connecting wire rod holding member when there are many connecting wire rods, etc. Can be easily attached to the coil winding member only by engaging the engaged portion of the connecting wire rod holding member with the engaging portion of the coil winding member, and work efficiency can be improved. Become.

EXAMPLE Next, an example of the cross coil type instrument (hereinafter, simply referred to as instrument) according to the present invention will be described. FIG. 1 is a perspective view showing an embodiment of the present invention.

As shown in FIGS. 3 and 4, the instrument is roughly composed of a coil bobbin 1, a rotor 2, coils 3, 4, coil connecting wires 5a to 5d, a magnetic shield case 6, and a drive control circuit board 12. .

The coil bobbin 1 is a coil winding member, is made of a resin having lubricity (for example, an assure copolymer), and is made of a resin-molded pair of an upper case 1a and a lower case 1b. The upper case 1a and the lower case 1b respectively include a storage portion 7 for storing the rotor 2 and a coil.
A coil winding portion 8 around which 3 and 4 are wound is formed. Further the upper case 1a is a mounting hole 1a ₁ the holding member 9 for holding the coil connection wires 5a~5d is attached is formed.

The holding member 9 is made of a heat-resistant resin (polybutylene terephthalate), and has four through holes that vertically penetrate.
10a-10d are formed. These four through holes 10a-10d
Are formed in a row on the holding member 9 at equal intervals.
Some of the four through holes 10a to 10d have a small diameter.

Further, an engaging claw 9a is formed on the outer side portion of the holding member 9, and the engaging claw 9a constitutes the engaged part, and the upper case
The holding member 9 is held by the upper case 1a by engaging with the engaging portion 1a ₂ formed on the 1a.

A mounting recess is formed in the upper part of the lower case 1b,
By press-fitting the upper case 1a into the mounting recess, the upper case 1a and the lower case 1b are integrated to form the coil bobbin 1. A groove 13 is formed in the upper case 1a in the vertical direction, and the magnetic shield case 6 is inserted and mounted in the groove 13 in the assembled state. Further, a screw threaded hole 14 for mounting the circuit board 12 is formed on the back surface of the lower case 1b.

The rotor 2 includes a pointer shaft 2a and a disk-shaped rotor magnet 2b fixed to the pointer shaft 2a. This rotor 2
Is rotatably housed in the space formed by the housing portion 7 when the coil bobbin 1 is assembled. The pointer shaft 2a is supported by bearing portions 1a ₃ and 1b ₁ formed by the coil bobbin 1.

The coils 3 and 4 are wound around the coil winding portion 8 so as to intersect each other. Coil connecting wire 5a press-fitted into through holes 10a to 10d formed in end holding members 9 of coils 3 and 4
It is extended to ~ 5d and soldered to the upper end area.

Further, in the mounted state, the coil connecting wires 5a to 5d are configured to be substantially parallel to the rotation axis of the rotor 2. The magnetic shield case 6 has a bottomed cylindrical shape made of a high magnetic permeability metal, and the lower case 1b. It is arranged at the lower part of and is fixed together with the circuit board 12 by the screw 11. The magnetic shield case 6 is configured to surround a magnetic circuit formed by the rotor magnet 2b and the coils 3 and 4 which form the rotor 2, and magnetically protects the magnetic circuit from being affected by an external magnetic field. It has the function of shielding.

Reference numeral 12 denotes a control drive circuit board on which a control drive circuit for controlling the current applied to each coil 3, 4 is provided. A connector 10 for connecting the coil connecting wires 5a to 5d to the control drive circuit is mounted on the control drive circuit board 12.
The circuit board is attached and fixed by screwing a screw 11 into a lower portion of the coil bobbin through an attachment hole formed in the circuit board 12.
Further, a connector 10 is provided on the circuit board 12, and the lower ends of the coil connecting wire rods 5 a to 5 d extending below the holding member 9 are connected to the connector 10.

Since the heat-resistant resin is used for the holding member 9 to be soldered and the resin having lubricity is used for the lower case 1b and the upper case 1a, the bearing portion 1a ₃ of the rotating shaft of the rotor 2 is used. Since ₁ and 1b ₁ are made of a resin having lubricity, the rotation bearing of the rotor 2 can reduce the loss, and the portion to which heat is applied by soldering is made of a resin having heat resistance. Therefore, it is not necessary to pay attention to excessive heat when soldering, and the workability of soldering can be greatly improved.

Effect of the Invention As described above, according to the present invention, the connecting wire rod is held by the connecting wire rod holding member made of the high heat resistant resin material, and the connecting wire rod holding member is formed with the engaging portion on the outer peripheral portion of the coil winding member. The coil is held by the coil winding member by engaging with the holding portion that is formed, and the relative position of the connecting wire and the coil is fixed, so that deformation or the like may occur around the connecting wire even if a large amount of heat is applied to the connecting wire. Since there is no, it is possible to apply relatively large heat when connecting the coil and the connecting wire with solder,
The work efficiency of soldering can be improved and the connection can be surely made.Because the coil winding member can be made of highly lubricious resin material that is weak against heat, the loss of the bearing against the rotation of the rotor can be reduced. Since a good operation of the rotor can be realized and further, the connecting wire can be held by the coil winding member after being held by the connecting wire holding member,
If there are many connecting wire rods, etc., if the connecting wire rods are assembled to the connecting wire rod holding member, they can be easily attached to the coil winding member, and work efficiency can be improved. Have.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a plan view and a sectional view of an essential part of the present invention, FIG. 3 is a sectional view of an embodiment of the present invention, and FIG. FIG. 5 is a perspective view of a conventional example, FIG. 6 is a plan view and a sectional view of a main part of the conventional example, FIG. 7 is a sectional view of the conventional example, and FIG. [FIG. 6] is a plan view of a conventional example. 1 ... coil bobbin, 1a ... upper case, 1b ... lower case, 2a ... pointer shaft, 2b ... rotor magnet, 5
...... Connecting wire, 9 …… Holding member.

Claims (1)

[Scope of utility model registration request] 1. A coil winding member for holding a rotor rotatably and winding a coil around the outer periphery of the rotor, and an outer circuit of the coil winding member, wherein the coil is electrically connected to an external circuit. A cross-coil type instrument having a connecting wire to be connected to a connecting wire rod holding member for holding the connecting wire rod, which is made of a high heat-resistant resin material and has an engaged portion integrally formed on an outer peripheral portion thereof. Then, when the coil winding member is formed of a highly lubricious resin material and a mounting hole for mounting the connecting wire holding member, and the connecting wire holding member provided in the inner peripheral portion of the mounting hole is mounted in the mounting hole. A cross-coil type meter having a configuration in which an engaging portion that engages with the engaged portion and that holds the connection wire holding member on the coil winding member is integrally formed with the coil winding member.