JPS6134840Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a motor, particularly a small motor built into a shield case that shields noise, etc., and which has a lead wire led out from the input terminal of the motor to the outside of the shield case. In order to absorb the tension applied to the lead wire and prevent breakage of the lead wire without reducing the shielding effect, the lead wire is connected to the lead wire at the lead-out portion of the shield case from which the lead wire is led out. This invention relates to a motor configured to be crimped to a shield case and have lead wires extending in the direction of the motor axis.

Generally, a motor with an electronic governor used in a magnetic tape device has a motor section built into a shield case made of ferromagnetic material to shield noise generated when the motor rotates. In this case, a control panel having an electronic circuit for speed control of the electronic governor is usually also built into the shield case.

Conventionally, a shield case for preventing noise from leaking in a motor with such a configuration was made of a long cylindrical ferromagnetic material with only one end open, as shown in the perspective view of Figure 1. Shield case body 1 and this shield case body 1
The shield case lid 2 is made of a ferromagnetic material and has a short cylindrical shape with a diameter that can be press-fitted into the motor control panel. It was configured as follows. Then, a cutout groove 4 is formed in the open end of the shield case body 1 in order to guide the lead wire 3, which is adhesively fixed to the input terminal part (not shown) of the incorporated motor with solder or the like, to the outside of the shield case. After leading out the lead wire 3 of the motor (not shown) from this notch groove 4, the shield case lid 2 is press-fitted into the shield case body 1, pressing the lead wire 3 only slightly, and then removing the lead wire. A gap was provided around the lead wire 3 to prevent it from being cut undesirably.

In such a configuration, if the lead wire 3 is repeatedly pulled in each direction, it will come into unnecessary contact with the edge of the notch groove 4 and the edge of the shield case lid 2, and a shearing force will act, causing the lead wire to Accidents occurred in which the insulation coating of No. 3 was damaged and was often cut from this part. In addition, if the notch 4 of the lead-out part is slightly enlarged to provide a gap between the lead wire and the lead wire, when the lead wire 3 is pulled freely in various directions, this external tension will be directly applied to the motor. The lead wire 3 attached to the input terminal portion and fixed by soldering may peel off or be cut.

Therefore, consideration has been given to attaching rubber packing or fixing fittings for fixing the lead wires to the above-mentioned gaps. However, the use of fixtures and the like increases the number of parts and increases the number of steps for attaching the fixtures, leading to higher costs.

This invention aims to solve the above points,
A protrusion that has a space along the motor shaft is provided at the lead-out part for leading the lead wire connected to the input terminal of the motor to the outside of the shield case, and the shield case and the protrusion correspond to the protrusion. The purpose is to press and clamp the lead wire on the outer circumferential surface of the lid so as not to reduce the shielding effect, thereby absorbing the tension applied to the lead wire. This will be explained below with reference to FIGS. 2 to 6.

Figure 2 shows the shield in one embodiment of the present invention.
The front view of the case body, Figure 3, also shows the shield.
The side sectional view of the case, FIG. 4, also shows a perspective view of the motor with a shielded case.

In the figures, numerals 1 to 3 correspond to FIG. 1,
5 is a through hole, 6 is a protrusion constituting a protrusion, 7
is a space formed by this bulging protrusion 6.

In the shield case according to the embodiment of the present invention, the lead wire 3 (indicated by a dotted line in FIG. 3) connected to the terminal part of the motor incorporated in the shield case is guided obliquely in the space 7 and penetrates through the shield case. It is led out from the hole 5 to the outside of the shield case body 1. The lead wire 3 is bent into an L-shape, pressed and fixed by the shield case lid 2 and the bulging protrusion 6 which are press-fitted to the shield case main body 1 (see FIG. 4). Therefore, most of the external tension applied to the lead wire 3 is absorbed by the portion fixed by the bulging protrusion 6, and since the tension is dispersed at the bent portion, it is transmitted to the internal terminal portion. The tension will almost disappear. Further, since the bulging protrusion 6 covers the gap 7 of the through hole 5, a sufficient shielding effect can be achieved.

FIG. 5 is a front view of another embodiment of the shield case main body 1 according to the present invention, and FIG. 6 is a side sectional view of the shield case.

In the embodiment shown in FIGS. 5 and 6,
The projecting portion cuts and raises a tongue piece that cuts through the through hole 10 to form a cut and raised piece 8, and a space 9 is formed by this cut and raised piece 8 and the through hole 10. Therefore, although not shown in the drawings, the lead wires are led out of the shield case by diagonally passing through the through hole 10 by the cut and raised piece 8 having the space 9. In this embodiment as well, the lead wire is connected to the shield case lid 2.
It is bent into an L shape by the cut and raised pieces 8 and is pressed and fixed. Therefore, external tension applied to the lead wire is absorbed at the pressed and fixed portion of the cut and raised piece 8 and dispersed at the bent portion. Note that the cut and raised piece 8 is simpler than the bulging protrusion 6.

As described in detail above, the present invention comprises a lead-out portion having a protrusion having a space along the motor axis direction in the through hole formed at the open end of the shield case body in which the motor is incorporated, and The lead wire 3 from the motor terminal section is bent and diagonally led out to the outside of the shield case, and the lead wire is pressed and fixed at the protrusion, so the tension applied to the lead wire from the outside of the shield case is reduced. It is absorbed at the bending part and dispersed at the bending part. Therefore, tension is not applied directly to the terminals of the motor, so it is possible to prevent lead wire breakage and lead terminal peeling accidents at the terminals, which are weakest against external forces, and prevent protrusions and shielding cases. Since the portion that is double shielded with the lid is used, the shielding effect is not reduced. Furthermore, the production of the lead-out portion used in the present invention does not require a particularly high cost compared to the conventional method of obtaining only a cut groove, and the lead wire can be securely clamped to the shield case.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional shielded case motor, Figure 2 is a front view of the shielded case body in an embodiment of the present invention, Figure 3 is a side sectional view of the shielded case, and Figure 4. 5 is a perspective view of a motor enclosed in a shielded case, FIG. 5 is a front view of a shielded case body in another embodiment of the present invention, and FIG. 6 is a side view. In the figure, 1 is a shield case body, 2 is a shield case lid, 3 is a lead wire, 5 and 10 are through holes, 6 is a bulging projection, 7 and 9 are spaces, and 8 is a cut-and-raised piece.

Claims (1)

[Scope of utility model registration request] A long cylindrical shield case body made of ferromagnetic material in which a small motor with at least one input terminal is built in and only one end face is open, and this shield case body has approximately the same diameter and only one end face is open. A short cylindrical shield case lid made of ferromagnetic material is provided, and the shield case body and the shield case lid are press-fitted together so that their respective open ends have sliding surfaces in the direction of the motor axis. to constitute a shield case of the small motor, and a part of the shield case main body has a lead-out part around the opening for leading a lead wire connected to the input terminal part to the outside, The lead-out part includes a protrusion having a lead wire through hole and a space for leading out the lead wire along the motor axis direction, and the protrusion is formed in an elongated cylindrical shield case body. A motor characterized in that the space is doubly shielded by a corresponding shield and the outer periphery of the case lid, and the lead wire is pressed and clamped by the protrusion and the outer periphery.