JPH0556600A - Structure for leading out lead wire - Google Patents

Abstract

PURPOSE:To increase the tensile strength of a lead wire at the connection part to a terminal while improving reliability by eliminating exposure of a conductor of a lead wire lead-out part in a small motor or the like, by a simple structure. CONSTITUTION:A retaining member 34 having a protrusion 33 for retaining a lead wire 32 in the inside is removably mounted, and a cover for covering the connection part of the lead wire 32, on a case 10 of a small motor or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead wire drawing structure for electric equipment such as small motors.

[0002]

2. Description of the Related Art In electrical equipment such as small motors,
A structure is used in which leads for connecting to a power supply and a control circuit are drawn from the electric device. As a conventional lead wire drawing structure for a motor, after the lead wire is directly soldered to the coil, the lead wire is fixed to the coil or the surface of the device body with tape, or a circuit board fixed to the motor terminal is used. A structure in which lead wires are soldered is used.

[0003]

However, in the structure in which the above-mentioned lead wires are directly soldered and then fixed to the surface of the coil or the device main body with tape, it is necessary to firmly press the solder-connected lead wires with tape. However, there is a problem that the tape winding work for that purpose takes time and increases the cost. In addition, in the structure where the lead wire is soldered through the circuit board described above, the conductor of the soldered portion is exposed, so a problem may occur due to contact with an external conductor or the lead wire may be connected when pulled. There is a problem that the part is easily damaged.

The present invention has been made in view of such conventional problems, and an object of the present invention is to improve reliability by eliminating the exposed conductor portion with a simple structure.
It is an object of the present invention to provide a lead wire lead-out structure for electric equipment such as a small motor capable of increasing the tensile strength of the lead wire.

[0005]

According to the lead wire drawing structure of the present invention, a holding member having a projection for holding the lead wire is detachably attached to the lead wire connecting portion of the electric device. Is achieved. According to another aspect of the present invention, in addition to the above configuration, the pressing member is a cover that covers the lead wire connecting portion, or the protrusion is formed on the inner surface of the pressing member, and the pressing member is attached to an electric device. Sometimes, the lead wire is sandwiched between the protrusion and the surface of the electric device to more efficiently achieve the above object. Furthermore, the present invention achieves the above-mentioned object in a small motor by adopting a structure in which a pressing member having a protrusion for pressing the lead wire is detachably attached to the lead wire connecting portion on the side surface of the motor. ..

[0006]

1 is a longitudinal sectional view of a small motor having a lead wire drawing structure according to an embodiment of the present invention. Figure 1
2, an attachment plate 12 is fixed to the open end surface of the motor case 10 having an open end by a fixing means such as caulking 13. An end for sealing the open end surface of the motor case 10 by the attachment plate 12. A plate is formed. A bearing 15 is positioned and fixed to the opening 11 formed in the central portion of the motor case 10 by press fitting, bonding or the like.
Another bearing 16 is positioned and fixed to the opening 14 formed in the motor shaft center portion by press fitting or adhesion. A motor shaft 17 is supported by these bearings 15 and 16.

A rotor 18 is press-fitted and fixed at a position of the motor shaft 17 in the motor case 10. The rotor 18 is magnetized to the N and S poles at a predetermined pitch in the circumferential direction on the outer peripheral portion of the rotor 18. The magnet 19 is fixed. Inside the motor formed by the motor case 10 and the mounting plate 12, two stator units 50 and 60 facing the rotor magnet 19 with a predetermined gap are arranged side by side in the axial direction. Each of the stator units 50 and 60 has a structure in which the exciting coils 20 and 21 are housed between inner and outer yokes having pole teeth,
It constitutes the excitation phase of the motor and is therefore
The illustrated small motor constitutes a stepping motor having two excitation phases.

In the illustrated example, the first phase outer yoke 22 is formed integrally with the motor case 10 by cutting and raising a part of the end surface of the motor case 10, and the first phase inner yoke 23 and The second-phase inner yoke 24 is joined back to back, and the second-phase outer yoke 25 is integrally formed with the mounting plate 12 by cutting and raising a part of the mounting plate 12. The first-phase outer yoke 22 and the second-phase outer yoke 25 may be made of independent separate members and fixed to the motor case 10 and the mounting plate 12 by welding or the like. .. Thus, the first exciting coil 20 wound around the bobbin 26 is provided inside the first inner and outer yokes 22 and 23.
By installing the first phase stator unit 5
0, and by mounting the second exciting coil 21 wound around the bobbin 27 inside the second inner and outer yokes 24, 25, the second-phase stator unit 60
Is configured.

Each of the yokes 22, 23, 24, 25 is provided with a plurality of pole teeth formed at a predetermined pitch in the circumferential direction so as to face the rotor magnet 19 with a predetermined gap. The bobbins 26, 2
7 is made of, for example, an insulating material such as plastic, and portions 26A and 27A thereof are exposed from the side surface notch 31 of the motor case 10. The exposed portions are connected to the exciting coils 20 and 21, respectively. Motor terminals 28, 29
(4 or 6 in total) are fixed so as to project to the outside. A rotational force extracting means 30 such as a pulley is fixed to the output side projection of the motor shaft 17.

The respective motor terminals 2 projecting on the substantially same side in the circumferential direction of the motor case 10 (the side of the notch 31).
8 and 29 are formed of a conductive rod-shaped or plate-shaped metal having a predetermined rigidity. Therefore, each motor terminal 2
Lead wires (usually a plurality) 32 for connecting to a control circuit (not shown) (including a power source) are fixed to the tip portions of 8 and 29 by soldering or the like. Therefore, the notch 31 has a protrusion 3 for pressing the lead wire 32.
The pressing member 34 having the number 3 is detachably attached. The pressing member 34 also serves as a protective cover that covers a connecting portion (coupling portion) between the lead wire 32 and the motor terminals 28 and 29.

2 is a longitudinal sectional view of the central portion of the pressing member 34, FIG. 3 is a transverse sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a line 4-4 in FIG. 5 is a horizontal cross-sectional view taken along the line, and FIG. 5 is a vertical cross-sectional view of the same portion as FIG. 2 showing a state in which the lead wire 32 is held by the holding member 34. Figure 1
In FIG. 5, the pressing member 34 is made of an integrally molded plastic (insulating material), and the motor terminal 28,
It is detachably fixed to the notch 31 by patching so as to cover the connecting portion between the wire 29 and the lead wire 32.
That is, the pressing member 34 has a box-like shape with the lower surface opened, and also serves as a protective cover for covering the connecting portion of the lead wire 32.

1 to 5, the notch 3 of the motor case 10 is elastically displaceable on both sides of the pressing member 34.
Locking parts 3 that are detachably patched to both end edges of 1
5 is formed, and a rib for pressing the plurality of lead wires 32 at a predetermined distance (for example, about 3 mm to 12 mm) from the motor terminals 28 and 29 inside the pressing member 34. Shaped protrusions 33 are formed.
In the illustrated example, the engaging portion 35 is engaged with the cutout portion 31, and the end surface of the engaging portion 35 is attached to the bobbin 27.
It is positioned by abutting on the side surface of the exposed portion 27A. Further, an opening 36 for drawing out the lead wire 32 to the outside is formed at a predetermined position on the upper surface of the pressing member 34 (on the side opposite to the motor terminals 28 and 29 of the protrusion 33).

According to the configuration of FIGS. 1 to 5, the lead wire 32
After the pressing member 34 is inserted into the opening 36 of the pressing member 34 and the pressing member 34 is positioned and fixed to the notch 31 of the motor case 10 by a patching method, the vicinity of the connection end of each lead wire 32 is pressed by the protrusion 33. Therefore,
Even if the lead wire 32 is pulled, the lead wire 3
The tensile force does not act directly on the connection portion with the second motor terminal 28 or 29, and the stress can be significantly reduced. It should be noted that the force of pressing the lead wires 32 by the protrusions 33 can be adjusted depending on the height of the protrusions 33 and the elasticity of the protrusions 33 themselves.
In the illustrated example, a slit 37 for imparting elasticity is formed in the central portion of the protrusion 33.

According to the embodiment described above, the terminals 28,
By covering the connecting portion pressing member 34 between the lead wire 29 and each lead wire 32, the conductor portion of the lead wire lead-out structure can be prevented from being exposed, and reliability and safety can be improved. By pressing
Even when the lead wire 32 is pulled, the lead wire 32
It is possible to reduce or eliminate the stress that acts on the connection between the terminal and the terminal 28 or 29, and it is possible to increase the tensile strength of the lead wire 32.

FIG. 6 is a partial vertical sectional view showing another embodiment of the lead wire drawing structure according to the present invention. In this embodiment, an opening 36 for drawing the lead wire 32 is formed on the front surface of the pressing member 34. The lead-out direction of the lead wire 32 is different from that of the embodiment shown in FIGS. The embodiment shown in FIG. 6 is different from the above-mentioned embodiment only in the lead wire drawing direction, and has substantially the same configuration in other parts,
Corresponding parts are designated by the same reference numerals, and detailed description thereof will be omitted. According to the embodiment shown in FIG. 6, the same effects as those of the above-mentioned embodiment can be obtained.

[0016]

As is apparent from the above description, according to the lead wire drawing structure of the present invention, a holding member having a protrusion for holding the lead wire is detachably attached to the lead wire connecting portion of the electric device. Therefore, a lead wire drawing structure for an electric device is provided that has a simple structure and can improve the reliability by eliminating the exposure of the conductor portion and increase the tensile strength of the lead wire. According to another aspect of the present invention, in addition to the above configuration, the pressing member is a cover that covers the lead wire connecting portion, or the protrusion is formed on the inner surface of the pressing member, and the pressing member is used for an electric device. Since the lead wire is sandwiched between the protrusion and the surface of the electric device when attached, a lead wire drawing structure suitable for electric devices such as a small motor that can achieve the above effect more efficiently is provided. It

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a motor having a lead wire drawing structure according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a pressing member of a lead wire drawing structure according to an embodiment of the present invention.

3 is a cross-sectional view taken along the line 3-3 in FIG.

4 is a cross-sectional view taken along the line 4-4 in FIG.

5 is a vertical cross-sectional view showing a state where the pressing member of FIG. 2 is mounted and a lead wire is pressed.

FIG. 6 is a vertical sectional view showing a lead wire drawing structure according to another embodiment of the present invention.

[Explanation of symbols]

 10 motor case 12 end plate (mounting plate) 15 bearing 16 bearing 17 motor shaft 18 rotor 19 rotor magnet 20 exciting coil 21 exciting coil 26 bobbin 27 bobbin 28 motor terminal 29 motor terminal 31 notch 32 lead wire 33 protrusion 34 pressing member 35 Locking Part 36 Opening 37 Slit 50 First Phase Stator Unit 60 Second Phase Stator Unit

Claims (4)

[Claims] 1. A lead wire drawing structure, wherein a holding member having a projection for holding the lead wire is detachably attached to a lead wire connecting portion of an electric device. 2. The lead wire lead-out structure according to claim 1, wherein the pressing member is a cover that covers the lead wire connecting portion. 3. The projection is formed on the inner surface of the pressing member, and when the pressing member is attached to the electric device, the lead wire is sandwiched between the projection and the surface of the electric device. 1 lead wire drawing structure. 4. A lead wire connecting portion on a side surface of the motor,
A lead wire drawing structure for a small motor, wherein a holding member having a protrusion for holding the lead wire is detachably attached.