JPS6011735Y2 - motor - 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 at the lead-out part of the shield case from which the lead wire is led out, the lead wire is crimped to the shield case at the lead-out part, and the lead wire is inserted in the direction of the motor axis. This invention relates to a motor configured to derive .

Generally, a motor with an electronic governor used in a magnetic tape device has a motor section built into a shield case made of a ferromagnetic material to shield noise generated when the motor rotates.

In this case, a control panel having an electronic circuit for controlling the speed of the electronic governor is usually also built into the shield case.

Conventionally, a shield case for preventing noise from leaking in a motor having such a configuration is open only at one end, and consists of a shield case body 1 made of a long cylindrical ferromagnetic material, and a shield case main body 1 made of a ferromagnetic material, as shown in Fig. 5. 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 to the shield case body 1 and is open at only one end.The entire motor control panel is housed in one shield block. It had a wrapped structure.

Then, a notch JI4 is provided at the open end of the shield case body 1 in order to guide the lead wire 3, which is adhesively fixed with solder or the like to the input terminal section (not shown) of the incorporated motor, to the outside of the shield case body 1. After leading out the lead wire 3 (shown in the figure) from this notch groove 4, the shield case lid 2 is press-fitted into the shield case body 1, pressing only slightly on the lead wire 3, so that the lead wire 3 is not undesirably cut. In order to prevent this, a gap was made to some extent around the lead wire 3.

In such a configuration, when the lead wire 3 is pulled from each direction, the edge of the notch groove 4 and the edge of the shield case lid 2 come into unnecessary contact, and a shearing force acts, causing the lead wire 3 Accidents were occurring in which the insulation coating of the pipes was damaged and the parts were often cut off.

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, it has been considered to install a rubber gasket or a fixing fitting for fixing the lead wire in the above-mentioned gap.

However, the use of fixtures and the like increases the number of parts and increases the number of steps for attaching the fixtures, resulting in higher costs.

In order to solve this problem, as shown in FIG. 4, a space is formed in a part of the periphery of the opening of the shield case body 1 to lead out the lead wires along the motor axis direction. This protrusion I
There is also one in which the lead wire 3 is pressed and held between A and the corresponding outer periphery of the shield case lid 2;
Since the protrusion IA of this motor protrudes outward from the shield case, when the motor is attached to other equipment, the protrusion IA gets in the way and installation is restricted, and the tip edge of the protrusion 1A Since the lead wire is sharp, there is a problem in that the lead wire can be broken at that part.

The present invention aims to solve the problems of the conventional motor, and preferred embodiments thereof will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of a motor according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a partially enlarged sectional view.

1 to 3, 21 is a shield case body made of a long cylindrical ferromagnetic material with only one end open, and 22 is a diameter that can be press-fitted into the shield case body 21. This shield case lid is made of a ferromagnetic material and has a short cylindrical shape with only one end open.

A notch 21A for leading out the lead wire 3 is provided in a part of the periphery of the opening of the shield case body 21, and the innermost part of the notch 21A is for leading out the lead wire 3 as shown in detail in FIG. In order to prevent the innermost edge of the notch 21A from coming into contact with the lead wire 3 being inserted and damaging the insulation coating of the lead wire 3, the lead wire 3 is bent outward.

The size H of this bent cut and raised portion is about 0.5rIvn.

Further, a lead wire 3 soldered to an input terminal (not shown) of a small motor (not shown) is connected to a part of the periphery of the opening of the shield case lid 22 corresponding to the notch 21A of the shield case main body 21 to connect the motor shaft. Space 2 led out to the outside along the direction
A protruding portion 22A for forming the numeral 3 is provided in a shape that bulges inward of the case.

This protrusion 22A is connected to the shield case main body 2.
1, the distance H between the inner circumferential wall of the shield case body 21 and the bottom wall of the protrusion 22A is slightly smaller than the diameter of the lead wire 3.

Further, the tip of the press-fitting side of the protrusion 22A is chamfered 22 in order to prevent damage to the insulation coating of the lead wire 3 when the lead wire 3 is clamped by being press-fitted into the shield case main body 21A.
B has been done.

In the embodiment according to the present invention configured in this way, the lead wire 3 connected to the terminal portion of the motor incorporated in the shield case is connected to the shield case lid 22 when the shield case lid 22 is press-fitted into the shield case body 21. , and is guided in an inclined direction in the space 23 and led out from the notch 21A to the outside of the shield case main body 21.

The lead wire 3 is bent into an L-shape, pressed and fixed by the protrusion 22A of the shield case lid 22 press-fitted to the shield case body 1 and the inner peripheral wall of the shield case body 21.

Therefore, most of the external tension applied to the lead wire 3 is absorbed by the portion held between the bottom wall of the shield case M22A and the inner wall of the shield case main body 21, and the tension is dispersed at the bent portion. Almost no tension is transmitted to the internal terminals.

Furthermore, since the shield case main body 21 and the shield case lid 22 are in a sufficient overlap state at the lead wire lead-out portion, a sufficient shielding effect can be achieved.

Furthermore, a cut-out 21B is provided at the innermost edge of the notch 21A of the shield case body 21, and a chamfer 22B is also provided at the tip of the protrusion 22A of the shield case lid 22, so that the lead wire 3 can be connected to the outside. This is extremely useful in practical terms, as it does not damage or break the insulation coating of the lead wire 3 even when vibration is applied to it or during assembly, making it possible to provide a reliable motor. be effective.

Note that the innermost edge of the notch 21A of the shield case body 21 is not limited to the cut-and-raised part 21B, and may be chamfered.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a motor according to the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a partially enlarged sectional view. FIGS. 4 and 5 are enlarged sectional views showing a lead wire clamping structure in a conventional motor. 21... Shield case body, 22...
・Shield case lid, 3...Lead wire, 23・
...Space, 22A... Protrusion, 22B.
... Chamfer, 21A ... Notch, 21B
・・・・・・Bending part.

Claims (1)

[Scope of utility model registration request] A long cylindrical shield case body with an open end in which a small motor having a terminal portion is incorporated, and a short cylindrical case lid with an outer diameter approximately the same as the inner diameter of the case body and an open end with an open end. A lead wire, one end of which is connected to the terminal portion, is connected to a part of the curved surface of the case lid, and is led from the shaft center side of the motor to the inner circumferential wall side of the case body at an arbitrary angle.
A concave groove portion is provided for forming a space for guiding the motor shaft further along the extending direction of the motor shaft from the open end of the case lid, and
A notch opening is provided in a part of the case main body surface corresponding to the recessed groove to allow the lead wire guided in the recessed groove to be led out of the case, and is connected to the opening end. In the motor in which the case lid is press-fitted into the case body from the open end side and the lead wires are held between the bottom surface of the recessed groove of the case lid and the inner wall of the case body, the lead wires 3 are bent. A motor characterized in that an opening edge 22B provided with the recessed groove portion 22A to be brought into contact, and a back wall edge 21B of the cutout opening cut in a substantially U-shape are formed with gently curved surfaces.