JPH0983175A - Mounting structure for emi preventive filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mounting structure which eliminates that an EMI preventive filter is moved and which is rich in versatility by a method wherein the EMI preventive filter which is composed of one pair of filter half bodies used to carry and hold an electric wire is housed in a filter case. SOLUTION: Filter half bodies 2-1, 2-2 are housed in respective case half bodies 20-1, 20-2, the case half bodies 20-1, 20-2 are combined so as to carry and hold an electric wire by aligning espective edges in the axial direction, a first outer tube 30 is screwed to the outer circumferential part of the case half body 20-1 on one side of a filter case 20, and a second outer tube 40 is screwed to the outer circumferential part of the case half body 20-2 on the other side. On the other hand, a screw means 50 is mounted and attached inside the first outer tube 30 so that an EMI preventive filter 2 is not vibrated inside the filter case 20. In addition, the second outer tube 40 is screwed to semi- cylindrical protrusion parts 22-1, 22-2 installed so as to be attached to the outside of edge plates 28-1, 28-2 of the filter case 20, and the filter case 20 is fixed and bonded to the electric wire by a tightening means 60. Thereby, it is possible to obtain a mounting structure in which the EMI preventive filter 2 is not moved and which is rich in versatility.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for attaching an EMI prevention filter to an electric wire. 2. Description of the Related Art In recent years, electronic devices such as communication devices have a problem of EMI (electromagnetic interference) due to electromagnetic waves emitted from electronic devices or electromagnetic waves entering electronic devices as the amount of information to be processed increases and the speed increases. .

Therefore, as shown in FIG. 7, the electronic device 10
0 In addition to taking various electromagnetic wave prevention measures, install an EMI prevention filter 2 near the connection between the electric wire 1 for the external interface connected to the electronic device 100 and the electronic device 100 so that electromagnetic waves can enter through the electric wire. It is prevented from being discharged and discharged through the electric wire.

The EMI prevention filter 2 is made of a ferromagnetic material such as ferrite having a composition according to the applied frequency, and is mounted so as to surround the electric wire 1.

[0004]

2. Description of the Related Art A conventional mounting structure for an EMI prevention filter is shown in FIG. In FIG. 8, 2 is a pair of filter halves 2-1, 2-2 in which a ferromagnetic material such as ferrite is molded into a semi-cylindrical shape.
Is an EMI prevention filter. The radius of the axial center hole of each filter half 2-1 and 2-2 is slightly larger than the radius of the electric wire 1.

In the EMI prevention filter 2 as described above, the filter halves 2-1 and 2-2 are covered on the outside of the electric wire 1 so as to face each other.
The end face in the axial direction is brought into contact with and attached to the electric wire 1. Since the EMI prevention filter 2 is a sintered molded product, it may be damaged when it collides with another object. Therefore, the case is covered for protection.

Reference numeral 5 is a filter case made up of a pair of upper and lower case halves 5-1 and 5-2 made of plastic or the like. Each of the case halves 5-1 and 5-2 has a substantially semi-cylindrical shape with a hollow portion that accommodates the EMI prevention filter 2.

The case halves 5-1 and 5-2 have one side edge in the longitudinal direction connected through a hinge 6 and a lock means 7 on the other side edge. The illustrated locking means 7 is provided with a protrusion 7a near the opening of one case half 5-1 and the other case half 5-1.
A female member 7b that engages with the protrusion 7a is provided in the opening of 5-2.

[0008]

However, simply E
In the conventional mounting structure in which the outside of the MI prevention filter is covered with the filter case, the electric wire only penetrates the shaft hole of the EMI prevention filter, so that the mounting position is changed by the vibration of the electronic device, the vibration of the electric wire, or the like. There is a risk that the EMI prevention filter may move to a position away from the electronic device.

When the EMI prevention filter moves to a position away from the electronic device in this way, electromagnetic waves enter the electronic device from the electric wire portion between the EMI prevention filter and the electronic device or are emitted through the electric wire. There was a problem.

Further, not only does the inner diameter of the EMI prevention filter change in accordance with the outer diameter of the electric wire, but also the length differs in order to obtain predetermined characteristics. The conventional EMI-preventing filter case can be applied to electric wires having different outer diameters (inner diameter of the EMI-preventing filter), but can be applied to EMI-preventing filters having different lengths, and has a problem of poor versatility.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a mounting structure of an EMI prevention filter which is versatile and has no fear that the EMI prevention filter mounted on an electric wire will move. Has an aim.

[0012]

In order to achieve the above object, the present invention has a pair of semi-cylindrical filter halves for holding an electric wire 1 by aligning axial end faces thereof, as illustrated in FIG. EMI prevention filter 2 consisting of 2-1, 2-2, and a semi-cylindrical protrusion on the outside of end face plate 28-1 on the other side with one face open to accommodate one filter half 2-1 in the hollow part. A semi-cylindrical case half body 20-1 having 22-1 and the other filter half body 2-2 in the hollow part, one side being open and the other half being outside the end face plate 28-2 on the other side. And a filter case (20) made of a substantially half-cylindrical rice field case half (20-2) having a cylindrical protrusion (22-2).

Further, a hole 33 larger than the outer diameter of the electric wire 1 is provided at the center of the end face plate 32, and the hole 33 extends from the shell to the end face plate 32.
The first outer cylinder 30 having a substantially cap nut shape screwed to the thread 21 formed on the outer peripheral surface of the filter case 20 and having the band-shaped notch 35 communicating with the outer end of the electric wire 1 at the center of the end plate 42. In the screw thread 23 formed on the outer peripheral surface of the semi-cylindrical projections 22-1 and 22-2, which has a hole 43 larger than the diameter and has a band-shaped notch 45 communicating with the hole 43 from the shell to the end plate 42. The second outer cylinder 40, which is screwed and has a substantially cap nut shape.

Further, the first outer cylinder 30 is attached to the filter case 20.
By screwing the end face of the EMI prevention filter 2 against the inner face of the end face plates 28-1, 28-2 of the filter case 20.
A spring means (50) housed in the outer cylinder (30) and a semi-cylindrical protrusion
A semi-cylindrical protrusion 22-1, 22-2 for fixing the filter case 20 to the electric wire 1 by screwing the second outer cylinder 40 to the 22-1, 22-2.
And a fastening means 60 provided in the hollow portion of the.

It is assumed that the spring means 50 is a bellows type spring in which the electric wire 1 penetrates the hollow portion. Alternatively, it is assumed that the spring means 50 is a plurality of compression coil springs 57 arranged and mounted outside the electric wire 1 as illustrated in FIG.

The fastening means 60 has a semi-cylindrical protrusion 22-
The electric wire 1 is housed in the semi-conical hollow 25-1,25-2 of 1,22-2 with the large-diameter side end face abutting the end face plate 42 of the second outer cylinder 40. Equipped with a pair of semi-hollow truncated cones 61-1 and 61-2,
In this semi-hollow truncated cone 61-1 and 61-2, the second outer cylinder 40 is screwed into the semi-cylindrical projections 22-1 and 22-2 of the filter case 20, so that the inner wall of the hollow hole is an electric wire. The outer peripheral surface of No. 1 is closely attached.

Alternatively, the fastening means 60 has the root 66 fixed to the inner wall portion of the second outer cylinder 40, as shown in FIG.
The tip side is provided with an elastic tongue piece 65 that obliquely projects in the direction of the semi-cylindrical projections 22-1, 22-2.

The tongue piece 65 is formed by screwing the second outer cylinder 40 to the semi-cylindrical projections 22-1 and 22-2 of the filter case 20.
The semi-cylindrical projections 22-1 and 22-2 are bent by the tip surfaces thereof, and the tip portions are in pressure contact with the outer peripheral surface of the electric wire.

According to the present invention, the filter halves 2-1 and 2-2 are housed in the case halves 20-1 and 20-2, respectively, and the case halves are held so that the end faces in the axial direction are aligned to hold the electric wire 1. The bodies 20-1 and 20-2 are combined to form a cylindrical filter case 20, and the first cylindrical outer case is formed on one outer peripheral portion of the combined cylindrical filter case 20.
The outer cylinder 30 is screwed on, and the second outer cylinder 40 is screwed on the other outer peripheral portion.

That is, the combined case halves 20-1, 20-2
The EMI prevention filter 2 does not fall off from the filter case 20 as well as the EM
The work of attaching the I prevention filter 2 to the electric wire 1 is easy.

On the other hand, spring means mounted in the first outer cylinder 30
By 50, one end surface of the EMI prevention filter 2 housed in the filter case 20 is pressed, the other end surface of the EMI prevention filter 2 is pressed against the end face plate of the filter case 20, and the EMI prevention filter 2 is inserted into the filter case 20. It is a structure that does not vibrate inside.

Therefore, even if the length of the EMI prevention filter 2 is short, the filter case 20, the first outer cylinder 30,
Parts such as the spring means 50 are common, and are highly versatile. Further, the second outer cylinder 40 is screwed to the semi-cylindrical projections 22-1, 22-2 provided outside the end plates 28-1, 28-2 of the filter case 20, so that the semi-cylindrical shape is obtained. The fastening means 60 housed in the hollow portions of the protrusions 22-1 and 22-2 presses the electric wire 1 against the electric wire 1 to fix the filter case 20 to the electric wire 1. Therefore, the filter case 20 does not move.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail with reference to the drawings. The same reference numerals indicate the same objects throughout the drawings.

FIG. 1 is a diagram of a first embodiment of the present invention.
(A) is a cross-sectional view, (B) is a perspective view showing the essential parts separated,
2 is a perspective view of the first outer cylinder, and FIG. 3 is a perspective view of the second outer cylinder.

FIG. 4 is a perspective view of the components of the first embodiment,
FIG. 5 is a diagram of the second embodiment of the present invention, and FIG. 6 is a diagram showing the essential points of the second embodiment. In FIG.
EMI prevention filter 2 composed of a pair of semi-cylindrical filter halves 2-1, 2-2 made of ferromagnetic material such as ferrite
Is a structure in which the filter halves 2-1 and 2-2 are covered on the outside of the electric wire 1 so as to face each other, and the axial end surfaces are brought into contact with each other to form a cylindrical shape and attached to the electric wire 1.

Reference numeral 20 denotes a metal (a non-magnetic metal such as aluminum is preferable for the reason that it has little influence on the characteristics of the EMI prevention filter) or a pair of upper and lower case halves 20-1 and 20-2 made of plastic. It is a filter case consisting of.

One of the case halves 20-1 is a substantially semi-cylindrical shape having one end open and the other end having an end face plate 28-1, and one of the halves of the filter 2 of the EMI prevention filter 2 is in the hollow portion thereof. It accommodates one.

A semi-cylindrical protrusion is formed on the outer surface of the end plate 28-1.
22-1 is provided. The end plate 28-1 and the semi-cylindrical protrusion
22-1 is a semicircle, and along its center line,
A semicircular hollow hole having an inner diameter larger than the outer diameter of the electric wire 1 is provided.

The other case half 20-2 is formed symmetrically with respect to the case half 20-1. That is, the other case half 20-2 is a substantially semi-cylindrical shape having one end open and the end face 28-2 on the other end, and the EMI is formed in the hollow portion.
It accommodates the other filter half 2-2 of the prevention filter 2.

A semi-cylindrical protrusion is formed on the outer surface of the end plate 28-2.
22-2 is provided. The end plate 28-1 and the semi-cylindrical protrusion
22-1 is a semicircle, and along its center line,
A semicircular hollow hole having an inner diameter larger than the outer diameter of the electric wire 1 is provided.

An engaging recess 29A is provided on an end surface parallel to the axis of the case half 20-2, and the engaging recess 29A is fitted to an end surface parallel to the axis of the other case half 20-1. By providing an engaging protrusion (not shown) that makes contact with the axial end surfaces of the case half body 20-1 and the case half body 20-2 and fitting the engaging recess 29A and the engaging protrusion, It is assembled into a cylindrical filter case 20.

In the state where the case half body 20-1 and the case half body 20-2 are combined, a screw thread 21 is threaded on the outer peripheral surface on the opening side of the filter case 20. In addition, semi-cylindrical protrusions 22-1, 22-2
A thread 23 is also threaded on the outer peripheral surface of the.

Reference numeral 30 is a first outer cylinder having a substantially cap nut shape, which is screwed to the thread 21 formed on the outer peripheral surface of the filter case 20. As shown in detail in FIG. 2, the first outer cylinder 30 has a cylindrical shape having an opening on one side and an end face plate 32 on the other side, and a hole larger than the outer diameter of the electric wire 1 at the center of the end face plate 32. 33 are provided.

Further, a female screw 34 which is screwed into the thread 21 of the filter case 20 is threaded on the inner peripheral surface of the first outer cylinder 30 on the opening side. Further, the shell portion of the first outer cylinder 30 is provided with a band-shaped notch 35 whose width parallel to the axis is larger than the outer diameter dimension of the electric wire 1. The band-shaped notch 35 extends to the end face plate 32 and communicates with the hole 33.

The electric wire 1 is passed through the band-shaped notch 35 to form the first outer cylinder.
The electric wire 1 penetrates the axial center of the first outer cylinder 30 by being inserted into the inside of the first outer cylinder 30. 40 is a semi-cylindrical protrusion 22 of the filter case 20.
A second outer cylinder having a substantially cap nut shape, which is screwed to the thread 23 formed on the outer peripheral surface of -1,22-2.

As shown in detail in FIG. 3, the second outer cylinder 40 has a cylindrical shape having an opening on one side and an end face plate 42 on the other face side, and the outer diameter of the electric wire 1 is centered on the end face plate 42. Larger holes 43
Is provided.

On the inner peripheral surface on the opening side of the second outer cylinder 40, a female screw 44 which is screwed into the screw thread 23 of the semi-cylindrical projection of the filter case 20 is threaded. Further, the shell portion of the second outer cylinder 40 is provided with a band-shaped notch 45 whose width parallel to the axis is larger than the outer diameter of the electric wire 1. The band-shaped notch 45 is extended to the end face plate 42 and communicated with the hole 43.

The electric wire 1 is passed through the band-shaped cutout 45 to form a second outer cylinder.
The electric wire 1 penetrates the shaft center of the second outer cylinder 40 by being inserted into the inside of the second outer cylinder 40. As described above, the filter halves 2-1 and 2-2 are housed in the case halves 20-1 and 20-2, respectively, and the end faces in the axial direction are aligned to hold the electric wire 1 with the EMI prevention filter 2. The case halves 20-1 and 20-2 are combined to form a cylindrical filter case 20, the first outer cylinder 30 is screwed onto one outer peripheral portion, and the semi-cylindrical protrusion portion provided on the other end is provided. Second on the outer circumference
The outer cylinder 40 is screwed on.

Therefore, the combined case halves 20-
1,20-2 cannot be opened, so EMI prevention filter 2
Is not only dropped from the filter case 20. In addition, the EMI prevention filter 2 is placed at a desired position on the electric wire 1.
Can be easily installed.

Returning to FIG. 1, when the first outer cylinder 30 is screwed into the filter case 20, one end surface of the EMI prevention filter 2 is pressed to bring the other end surface of the EMI prevention filter 2 into the end of the filter case 20. Spring means 50 for pressing the inner surfaces of the face plates 28-1, 28-2 are provided in the first outer cylinder 30.

The spring means 50 shown in FIG. 1 is a bellows type spring. Since the bellows spring has a band-shaped notch 51 that is parallel to the shaft center, the wire 1 penetrates the shaft center of the bellows-type spring by inserting the wire 1 into the bellows-shaped spring through the band-shaped notch 51. To do.

Such a bellows type spring is used as the first outer cylinder 30.
Since it is mounted inside, when the first outer cylinder 30 is screwed, the bellows type spring compresses and the spring force presses the EMI prevention filter 2 toward the end face plate side of the filter case 20, thus preventing EMI. The filter 2 does not vibrate inside the filter case 20.

On the other hand, the semi-cylindrical protrusion of the filter case 20
When the second outer cylinder 40 is screwed to the 22-1, 22-2, the fastening means 60 for fixing the filter case 20 to the electric wire 1 is provided with a semi-cylindrical protrusion.
It is provided in the hollow part of 22-1, 22-2.

The fastening means 60 shown in FIG. 1 comprises a pair of semi-hollow truncated cones 61-1 and 61-2 (see FIG. 4). In order to accommodate this semi-hollow truncated cone 61-1 in the semi-cylindrical protrusion 22-1, the hollow portion of the semi-cylindrical protrusion 22-1 is connected to the end as shown in FIG. 1 (B). Face plate 28-1 side is a small diameter semi-conical hollow 25
-1.

Similarly, in order to house the semi-hollow circular truncated cone 61-2 in the semi-cylindrical projection 22-2, the hollow portion of the semi-cylindrical projection 22-2 is shown in FIG. 1 (B). As shown in the drawing, the end face plate 28-2 side has a semiconical hollow 25-2 with a small diameter.

The semi-hollow truncated cones 61-1 and 61-2 are so designed as to hold the electric wire 1 in the semi-conical hollows 25-1, 25-2 of the semi-cylindrical projections 22-1, 22-2. The second outer cylinder 40 into the semi-cylindrical protrusion
Tighten by screwing it into the threads 23 of 22-1, 22-2.

As a result, the large-diameter side end surface of the semi-hollow truncated cones 61-1 and 61-2 is pushed by the end face plate 42 of the second outer cylinder 40, and the semi-hollow truncated cones 61-1 and 61-2 are removed. The semi-conical hollows 25-1, 25-2 are inserted deeply, and the inner walls of the hollow holes of the semi-conical truncated cones 61-1, 61-2 are in close contact with the outer peripheral surface of the electric wire 1.

Therefore, the filter case 20 is fixed to the electric wire 1 and the filter case 20 is prevented from moving. The spring means 50 shown in FIG. 5 is one in which a plurality of compression coil springs 57 are arranged and mounted outside the electric wire 1.

In FIG. 5, reference numeral 55 denotes a spring-holding cylinder having a shell portion and an end face plate with band-shaped cutouts, and one end having an opening larger than the outer diameter of the electric wire 1 at the axial center of the end face plate. Place the guide pin 56 on the end surface of the spring holding tube 55, and
The spring holding cylinder 55 is positioned by inserting 56 into the guide hole provided in the end surface of the filter case 20.

A plurality of (for example, four) recesses are provided at an equal pitch inside the end plate of the spring holding cylinder 55, one end of the compression coil spring 57 is inserted into this recess, and the other end is inserted into the EMI prevention filter. It is in contact with the end face of No. 2.

Since the compression coil spring 57 is mounted in this manner, when the first outer cylinder 30 is screwed into the screw thread of the filter case 20 and tightened, the end face plate 32 of the first outer cylinder 30 becomes a spring. Push the holding tube 55 into the EMI prevention filter 2 side.

Therefore, the compression coil spring 57 compresses and the spring force presses the EMI prevention filter 2 toward the end face plate side of the filter case 20, and the EMI prevention filter 2 does not vibrate in the filter case 20.

In the fastening means 60 shown in FIG. 5, the root 66 is fixed to the inner wall portion of the second outer cylinder 40, and an elastic tongue piece 65, such as rubber, whose tip end is obliquely projected in the wire direction is used. Be prepared.

As shown in detail in FIG. 6, the fastening means 60 has a hollow truncated cone-shaped tongue piece 65 on the inner peripheral surface of a ring-shaped root 66.
The hollow truncated cone portion is provided with a notch 67 parallel to the axis and having a width larger than the outer diameter of the electric wire 1.

The fastening means 60 has a root 66 fitted in a ring groove provided in the inner wall of the second outer cylinder 40 and fixed by using an adhesive or the like. The second outer cylinder 40 is a semi-cylindrical protrusion of the filter case 20.
When screwed into the threads on the outer peripheral surface of 22-1, 22-2, the tongue
The outer peripheral surface of the middle portion of 65 is bent by being pressed by the tip end surfaces of the semi-cylindrical projections 22-1, 22-2. As a result, the tip portion of the tongue piece 65 is strongly pressed against the outer peripheral surface of the electric wire of the electric wire 1.

Therefore, the filter case 20 is fixed to the electric wire 1 and the filter case 20 is prevented from moving.

[0057]

Since the present invention is configured as described above, it has the following effects.

The filter halves are housed in the respective case halves, and the case halves are combined so as to hold the electric wires by aligning the end faces in the axial direction to form a cylindrical filter case. Since the first outer cylinder is screwed and the second outer cylinder is screwed to the other outer peripheral portion, the EMI prevention filter does not fall off from the filter case,
Moreover, it is easy to attach the EMI prevention filter to the electric wire.

Further, the electromagnetic wave does not enter the electronic device through the electric wire or is not emitted through the electric wire, so that the occurrence of electromagnetic interference is suppressed. On the other hand, by the spring means mounted in the first outer cylinder, one end face of the EMI prevention filter housed in the filter case is pressed, and the other end face of the EMI prevention filter is pressed against the end face plate of the filter case. By preventing the EMI prevention filter from vibrating inside the filter case 20, even if the EMI prevention filter has a short length,
Parts such as the first outer cylinder and the spring means can be commonly used.

That is, the mounting structure of the EMI prevention filter of the present invention is highly versatile. In addition, by screwing the second outer cylinder to the semi-cylindrical protrusion provided outside the end face plate of the filter case, the fastening means housed in the hollow portion of the semi-cylindrical protrusion is pressed against the wire. And secure the filter case to the wires. Therefore, it is possible to prevent the EMI prevention filter from colliding with other objects and being damaged due to the filter case not moving.

[Brief description of drawings]

FIG. 1 is a diagram of a first embodiment of the present invention, (A) is a cross-sectional view, and (B) is a perspective view showing a main part in a separated form.

FIG. 2 is a perspective view of a first outer cylinder.

FIG. 3 is a perspective view of a second outer cylinder.

FIG. 4 is a perspective view of the component according to the first embodiment.

FIG. 5 is a diagram of a second embodiment of the present invention.

FIG. 6 is a diagram showing a main part of the second embodiment.

FIG. 7 is a perspective view of an electronic device.

FIG. 8 is a diagram of a conventional example.

[Explanation of symbols]

 1 Wire 2 EMI prevention filter 2-1,2-2 Filter half 5,20 Filter case 5-1,5-2,20-1,20-2 Case half 22-1,22-2 Semi-cylindrical protrusion Part 28-1,28-2 End face plate 30 First outer cylinder 35,45,51 Band-shaped notch 40 Second outer cylinder 50 Spring means 55 Spring holding cylinder 56 Guide pin 57 Compression coil spring 60 Fastening means 61- 1,61-2 Semi-hollow truncated cone 65 Tongue

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Kamiko, 1015 Kamiodanaka, Nakahara-ku, Kawasaki, Kanagawa, Kanagawa Prefecture, 1015, Fujitsu Limited (72) Inventor, Kazuta Kashida, 1015, Kamedota, Nakahara-ku, Kawasaki, Kanagawa, Fujitsu Limited (72) Inventor Fellow Noboru 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (5)

[Claims] 1. An EMI-preventing filter comprising a pair of semi-cylindrical filter halves for holding an electric wire by matching axial end faces with each other, and one of the filter half halves is housed in a hollow portion, and one face is open. The other half of the end plate is a semi-cylindrical case half having a semi-cylindrical protrusion outside the end plate on the other side, and the other half of the filter in the hollow part. A filter case consisting of another semi-cylindrical case half having a semi-cylindrical protrusion on the outside of the, and a hole larger than the outer diameter of the wire in the center of the end face plate, and from the shell to the end. A first outer cylinder, which has a band-shaped notch that extends to the face plate and communicates with the hole, and which is screwed into a screw thread formed on the outer peripheral surface of the filter case and has a substantially nut shape. Has a hole larger than the diameter and communicates with the hole from the shell to the end plate A second cap having a substantially cap nut shape that is screwed to a thread formed on the outer peripheral surface of the semi-cylindrical protrusion having a band-shaped cutout, and the first cap is screwed to the filter case. Thus, the spring means housed in the first outer cylinder that presses the end surface of the EMI prevention filter against the inner surface of the end face plate of the filter case, and the second outer cylinder to the semi-cylindrical protrusion is screwed. An EMI-preventing filter mounting structure comprising: a fastening means provided inside the hollow portion of the semi-cylindrical projection for fixing the filter case to the electric wire by fastening. 2. The spring means according to claim 1 is a bellows type spring in which an electric wire penetrates a hollow portion.
Attachment structure of MI prevention filter. 3. The mounting structure for an EMI prevention filter according to claim 1, wherein the spring means is a plurality of compression coil springs arranged and mounted outside an electric wire. 4. The fastening means according to claim 1, wherein the electric wire is sandwiched in the semi-conical hollow of the semi-cylindrical protrusion with the large-diameter side end surface abutting the end face plate of the second outer cylinder. A pair of semi-hollow circular truncated cones are housed in the semi-hollow circular truncated cone, and the second outer cylinder is screwed to the semi-cylindrical projection of the filter case so that the inner wall of the hollow hole is the electric wire. EM characterized by being closely attached to the outer peripheral surface of
I prevention filter mounting structure. 5. The fastening means according to claim 1, further comprising an elastic tongue whose root is fixed to an inner wall portion of the second outer cylinder and whose tip side is obliquely projected toward the semicylindrical projection. The tongue piece is bent by the tip of the semi-cylindrical projection by screwing the second outer cylinder to the semi-cylindrical projection of the filter case, and the tip comes into pressure contact with the outer peripheral surface of the electric wire. A structure for mounting an EMI prevention filter, which is characterized by being a thing.