JPH09180825A - Wire shield structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a proper wire shield structure with its certain electromagnetic shield performance for preventing contact failures of the electric route between a corrugate presser and a coupler. SOLUTION: This wire shield structure is composed of a corrugate tube 47 for which conductive coating is applied and through which a wire 51 is inserted, a coupler having a cylinder-shaped part 53 to which conductive coating is applied and through which the wire 51 is inserted, and a corrugate presser 49 to which conductive coating is applied and through which the wire 51 is inserted, one end of which fits the corrugate tube 47 and the other end of which is fitted to the cylinder-shaped part 53. Here, a stop groove 59 is formed on the outer circumference of the cylinder-shaped part 53, a coupler stop protrusion 71 to be fitted to the stop groove 59 is protruded on the inner circumference face of the corrugate presser 49, and an elastic rib 73 coming into contact with the other side wall face of the stop groove 59 elastically is so protruded on the inner circumference face of the corrugate presser 49 as to bring the coupler stop protrusion 71 into pressure contact with one side wall face of the stop groove 59.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire shield structure that does not use a shielded wire, and is particularly suitable for an electric wire shield structure applied to a device such as a control device mounted on an automobile, which requires a reliable electromagnetic shield performance. Related to the improvement of.

[0002]

2. Description of the Related Art Present automobiles have a CPU (Central Processing Unit)
Various electronic devices including is installed, and of course, shielded wires are used for transmitting and receiving high frequency signals. However, the shield wire is expensive, and the wiring work is troublesome because the shield wire needs to be grounded together with the core wire. As a solution to such a problem, an electric wire shield structure has been adopted in which a normal electric wire is used for wiring and a shield effect similar to that in the case of using a shield wire is obtained. An example of this type of electric wire shield structure will be described with reference to FIGS.

The electric wire shield structure 1 shown in FIG.
A box 3 containing an electronic device such as U, a coupler 7 fixed to the side surface of the box 3 by a mounting bolt 5, and a corrugated tube 11 which is a shield member for covering an electric wire 9.
And a corrugated presser 13 that connects the corrugated tube 11 to the coupler 7.

The coupler 7 shown in FIG. 6 has a flange portion 1
5 and the tubular portion 17, the tubular portion 17 is divided into a fitting portion 17a fitted inside the box 3 and a portion protruding outside the box 3. A locking groove 19 for locking the corrugated retainer 13 and a locking groove 21 for locking the corrugated tube 11 are formed in the portion protruding outside the box 3.

As shown in FIG. 7, the corrugated presser 13
Is a gutter-shaped two half member 23a, 23b
It is composed of the above and is configured into a cylindrical shape by locking them by the coupling means 25. An annular locking projection 27 is provided on one end of the corrugated retainer 13, and is fitted into the locking groove 19 and locked when assembled to the tubular portion 17. In addition, a locking projection 29 that locks the locking groove 21 is provided on the inner surface of the other end of the corrugated retainer 13.
Are formed.

[0006] The electric wire shield structure 1 thus configured
For assembling, first, as shown in FIG. 6, the fitting portion 17a of the coupler 7 is inserted into the mounting opening 3a formed in the box 3 and is tightened and fixed by the mounting bolt 5. At this time, as shown in FIG. 5, since the annular waterproof packing 33 made of a rubber material or the like is fitted in the annular groove 31 formed on the outer peripheral surface of the fitting portion 17a, the box 3 is fitted to the box 3. By mounting, the waterproof packing 33 comes into contact with the opening edge of the mounting port 3a, and the inside of the box 3 becomes watertight.

Next, the locking groove 2 formed in the cylindrical portion 17
1 is covered with one end of a corrugated tube 11 covering the electric wire 9, and the end of the electric wire 9 to which the crimp terminal 9 a is connected is positioned in the box 3. Then, the half-divided members 23a and 23b are covered so as to cover the cylindrical portion 17 and are connected by the coupling means 25, and the cylindrical corrugated presser 13 shown in FIG. 7 is assembled so as to cover the entire cylindrical portion 17. Attached. In this state, the locking projection 27 is fitted into the locking groove 19 and locked, so that the corrugated retainer 13 cannot be pulled out.

The coupler 7 and the corrugated retainer 13 are molded of synthetic resin, and the entire surface is metal-plated. Further, the corrugated tube 11 is also molded into a flexible cylindrical body using synthetic resin, and the surface thereof is metal-plated. Therefore,
By locking the corrugated tube 11 in the locking groove 21 and covering the corrugated retainer 13 and tightening it,
The corrugated tube 11, the corrugated retainer 13, the coupler 7 and the box 3 are electrically connected, and the electric wire 9 is shielded.

[0009]

However, in the electric wire shield structure 1 as described above, the tubular portion 17 of the coupler 7 is provided.
Since the locking groove 19 is formed in the locking groove 19, and the locking projection 27 of the corrugated retainer 13 is fitted into the locking groove 19 to lock the corrugated retainer 13 to the coupler 7, the dimensional tolerance at the time of manufacture may cause A gap is formed between the locking groove 19 and the locking protrusion 27 in the electric wire axial direction.

Therefore, when the corrugated retainer 13 rattles and rubs against the coupler 7 due to vibrations during traveling, both metal platings are peeled off or the electrical path from the corrugated tube 11 to the box 3 comes into contact. There is a possibility that it may become defective and may cause defective shielding of the electric wire 9. Therefore, an object of the present invention is to solve the above problems, and to provide a good electric wire shield structure having a reliable electromagnetic shield performance by preventing a contact failure of an electric path between a corrugated retainer and a coupler. .

[0011]

The above object of the present invention has a corrugated tube which is plated with a conductive material and through which an electric wire is inserted, and a tubular portion which is plated with a conductive material and through which the electric wire is inserted. An electric wire shield including a coupler and a tubular corrugated retainer which is electroconductively plated and through which the electric wire is inserted, one end of which locks the corrugated tube and the other end of which is locked by the tubular portion. In the structure, an annular locking groove is formed on the outer peripheral surface of the tubular portion, and a coupler locking projection to be fitted in the locking groove is provided on the inner peripheral surface of the corrugated retainer so as to protrude from the corrugated member. On the inner peripheral surface of the retainer, an elastic rib that elastically comes into contact with the other side wall surface of the locking groove is provided so as to press the coupler locking projection against the one side wall surface of the locking groove. Reached by the wire shield structure It is.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the wire shield structure according to the present invention will be described in detail below with reference to the drawings. 1 is an overall cross-sectional view showing an electric wire shield structure according to the present invention, FIG. 2 is an enlarged cross-sectional view of a coupler side locking portion of the corrugated retainer shown in FIG. 1, and FIG. 3 is a coupler side engagement of the corrugated retainer shown in FIG. FIG. 4 is a perspective view of the stopper portion, and FIG. 4 is an enlarged view of an essential portion of the coupler side locking portion shown in FIG.

As shown in FIG. 1, a wire shield structure 41
Is a box 43 that houses electronic devices such as a CPU
And a corrugated presser 49 that connects a corrugated tube 47 to the coupler 45, and shields the electric wire 51 wired into the box 43.

The box 43 is formed by aluminum die casting or the like having a shielding effect. On the other hand, the coupler 45 is made by integrally molding a hard resin, and is composed of a cylindrical tubular portion 53 into which the electric wire 51 is inserted, and a flange portion 55 protruding from the outer periphery of the tubular portion 53. There is.
The tubular portion 53 is roughly divided into a fitting portion 57 that fits inside the box 43 and a portion that is exposed to the outside of the box 43, with the flange portion 55 as a boundary. Cylindrical part 53 exposed to the outside
An annular locking groove 59 is formed on the outer circumference of the locking groove 59.
Engages with the corrugated retainer 49 by the structure described later.

The surface of the coupler 45 is plated with a conductive material, that is, metal. The flange portion 55 is provided with a screw insertion hole. Therefore, the coupler 45 is fixed to the box 43 by the mounting bolt 61 so that the back surface of the flange portion 55 is in close contact with the surface of the box 43, so that the coupler 45 is electrically connected to the box 43.

The corrugated tube 47, through which the electric wire 51 is inserted, is made by integrally molding a flexible synthetic resin, and is formed in a so-called bellows tube in which a large diameter portion 63 and a small diameter portion 65 are alternately provided. There is. This corrugated tube 47
The outer surface and the inner surface of the are plated with Ni, for example, with Cu plating as a base. When the electric wire 51 is inserted through the corrugated tube 47, the frequency is 500 Hz to 2 MHz.
In this band, a shield effect of -40 dB or more can be obtained.

The corrugated presser 49 is made of a hard resin, and is a combination of gutter-shaped half members 49a and 49b (see FIG. 3) having conductive plating on the surface thereof, which is locked by the connecting means 67 and has a cylindrical shape. Is composed of. In addition, the corrugated presser 49 exemplified in this embodiment is the coupler 4
The diameter on the 5 side is large and the diameter on the corrugated tube 47 side is small, but the outer shape is not limited to this and may be a cylindrical shape having the same diameter at both ends.

A corrugated locking projection 69 is provided on the inner peripheral surface of the corrugated retainer 49 on the small diameter side, that is, on the side where it is assembled to the corrugated tube 47. The corrugated locking projection 69 is a combination of half members 49a and 49b. It is fitted in the outer peripheral portion of the corrugated tube 47 in the closed state. The corrugated tube 47 whose outer peripheral portion is fitted to the corrugated locking protrusion 69 is restricted from coming off from the corrugated retainer 49. Therefore, the tubular portion 53 is inserted through the corrugated presser 49.
The corrugated tube 47 fixed to is electrically connected to the coupler 45 so as to obtain a shield effect.

On the other hand, a coupler locking projection 71 protruding toward the center of the shaft is provided on the inner peripheral surface of the large-diameter side end of the corrugated retainer 49, that is, the end that is assembled to the tubular portion 53. , The coupler locking projection 71 is a half member 49a,
49b are combined and inserted into the locking groove 59 of the tubular portion 53. The coupler locking projection 71 has a semi-circular shape when the corrugated retainer 49 is divided into halves, but forms a ring-shaped projection row when combined as shown in FIG.

Further, the inner peripheral surface of the corrugated retainer 49 located inside the coupler locking projection 71 (right side in FIG. 2) has a slight gap with the coupler locking projection 71 in the axial center direction. A protruding elastic rib 73 is provided.
The elastic ribs 73 can be elastically deformed toward and away from the coupler locking projection 71, and are inserted into the locking groove 59 at the same time as the coupler locking projection 71. Elastic rib 73
As shown in FIG. 3, a plurality of small arc-shaped members are arranged along the coupler locking projection 71 in the circumferential direction. The elastic rib 73 may be formed in an annular shape that is continuous along the coupler locking projection 71.

As shown in FIG. 4, the dimension t between the coupler locking projection 71 and the outer surface of the elastic rib 73 is set to be slightly larger than the groove width dimension d of the locking groove 59. Accordingly, the coupler locking projection 71 and the elastic rib 73 are elastically displaced by the elastic rib 73 and the dimension t between the outer surfaces is reduced, so that the locking groove 5 is formed.
It will be pressed into 9. A taper surface 75 is formed at the tip of the outer side of the elastic rib 73 in the inclined direction to thin the tip. The taper surface 75 facilitates the insertion of the elastic rib 73 into the locking groove 59. The elastic rib 73 is guided.

Next, the assembling of the above wire shield structure 41 will be described. First, the fitting portion 5 of the coupler 45
7. A waterproof packing 77 is fitted into a fitting groove 57a (see FIG. 1) formed on the outer peripheral surface of the box 7, and the fitting portion 57 is fitted into the box 43.
It is press-fitted into the mounting port 79 formed in. The coupler 45 is press-fitted until the flange portion 55 contacts the side surface of the box 43, and then the flange portion 55 is fixed by the mounting bolt 61. A waterproof plug 56, which is prevented from falling off by a rear holder 52, is inserted into the coupler 45, and seals between the waterproof plug 56 and the electric wire 51 inserted into the tubular portion 53 of the coupler 45.

That is, the entire coupler 45 is a box 43.
The waterproof packing 77 comes into close contact with the inner peripheral surface of the mounting port 79, whereby the inside of the box 43 becomes watertight. Next, the corrugated tube 4 in which the electric wire 51 is inserted
7 and the tubular portion 53 of the coupler 45 are covered with a corrugated retainer 49 in a half-divided state. The corrugated presser 49 in the half-split state is locked by the coupling means 67 and is formed into a tubular shape. As a result, the corrugate locking projection 69 is fitted to the bellows-shaped outer peripheral portion of the corrugated tube 47, and the corrugated tube 47 is held by the corrugated retainer 49.
Is regulated.

At the same time, the coupler locking projection 71 and the elastic rib 73 of the corrugated retainer 49 are inserted into the locking groove 59 of the tubular portion 53. The coupler locking projection 71 and the elastic rib 73 are pressed into the locking groove 59 by elastically displacing the elastic rib 73 toward the coupler locking projection 71 side.
Therefore, the coupler locking projection 71 is pressed against one side wall surface 59a (see FIG. 4) of the locking groove 59, and the elastically displaced elastic rib 73 is pressed against the other side wall surface 59b of the locking groove 59. Become. As a result, the coupler locking projection 7
1 and the elastic rib 73 are inserted and locked in the locking groove 59 without rattling, and the corrugated presser 49 is prevented from coming off from the coupler 45. In the electric wire shield structure 41 thus assembled, the corrugated tube 47 covered with the electric wire 51 is electrically connected to the box 43 via the corrugated retainer 49 and the coupler 45.

According to the above-mentioned wire shield structure 41, the corrugated retainer 49 is provided with the elastic ribs 73 spaced apart from the coupler locking projections 71, and the elastic ribs 73 are elastically deformed and inserted into the locking grooves 59. Since the elastic restoring force of the elastic rib 73 causes the coupler locking projection 71 and the elastic rib 73 to be closely fitted to the side wall surfaces 59a and 59b of the locking groove 59, respectively, the coupler 45 is pressed.
It is possible to prevent looseness of the corrugated presser 49 in the axial direction.

Even if the corrugated retainer 49 is displaced in the axial direction, since the elastic rib 73 is press-fitted into the locking groove 59 while being elastically deformed, the elastic rib 73 and the side wall surface 59b are formed. The force that creates a gap between the elastic ribs 73 is always absorbed by the displacement of the elastic ribs 73 due to the elastic restoring force, so that the elastic ribs 73 and the side wall surfaces 59b are not separated from each other and the contact state is always secured. Becomes

Further, since the corrugated retainer 49 press-fits the coupler locking projection 71 and the elastic rib 73 into the locking groove 59, the coupler locking projection has a gap and is fitted into the locking groove as compared with the conventional structure. Also, the rotation of the corrugated presser 49 in the circumferential direction can be restricted, and the plating peeling of the contact portion due to the easy rotation of the corrugated presser 49 can be prevented. As a result, the corrugated presser 49 does not rattle against the coupler 45 due to vibrations, etc., and the corrugated presser 49 rubs against the coupler 45 to peel off the metal plating from both sides, or the corrugated tube 47 to the box 43 is electrically connected. It is possible to obtain a reliable shield performance without causing poor contact in the route.

The electric wire shield structure of the present invention is not limited to the structure of the electric wire shield structure 41 of the above embodiment, and it goes without saying that various modifications can be made. For example, in the coupler 45 of the wire shield structure 41, the flange portion 55 and the tubular portion 53 are integrally formed and fixed directly to the box 43, but the box 43
It is also possible to construct the flange coupling portion fixed to the above and the cylindrical portion that locks the corrugated retainer 49 as separate bodies, and connect both members with a connector.

[0029]

As described in detail above, according to the electric wire shield structure of the present invention, the coupler locking projection to be fitted in the locking groove is provided on the inner peripheral surface of the corrugated retainer, and further, On the inner peripheral surface of the corrugated retainer, an elastic rib that elastically contacts the other side wall surface of the locking groove is provided so as to press the coupler locking projection against one side wall surface of the locking groove. Due to the elastic restoring force of the rib, the coupler locking projection and the elastic rib are pressed into the both side wall surfaces of the locking groove in a close contact state, and it is possible to prevent rattling of the corrugated retainer in the axial direction. Therefore, the corrugated retainer does not rub against the coupler to remove the metal plating on both sides, and the electrical path from the corrugated tube to the box does not have poor contact. Therefore, it is possible to provide a good electric wire shield structure having a reliable electromagnetic shield performance by preventing the contact failure of the electrical path between the corrugated press and the coupler.

[Brief description of the drawings]

FIG. 1 is an overall cross-sectional view showing an electric wire shield structure according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the corrugated presser shown in FIG.

FIG. 3 is a perspective view of a main part of the corrugated presser shown in FIG.

FIG. 4 is an enlarged view of a main part of the corrugated retainer shown in FIG.

FIG. 5 is a cross-sectional view showing a conventional electric wire shield structure.

FIG. 6 is a perspective view showing an assembled state of the coupler shown in FIG.

FIG. 7 is an overall perspective view showing the configuration of the corrugated presser shown in FIG.

[Explanation of symbols]

 41 wire shield structure 45 coupler 47 corrugated tube 49 corrugated retainer 51 wire 53 tubular portion 59 locking groove 59a one side wall surface of the locking groove 59b other side wall surface of the locking groove 71 coupler locking projection 73 elastic rib

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 19, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

[Figure 5]

Claims (1)

[Claims] 1. A corrugated tube which is plated with a conductive material to insert an electric wire, a coupler having a tubular portion which is plated with a conductive material and inserted into the electric wire, and which is plated with a conductive material. An electric wire shield structure having a tubular corrugated retainer in which an electric wire is inserted and one end of which locks the corrugated tube and the other end of which is locked to the tubular portion, the outer periphery of the tubular portion An annular locking groove is formed on the surface, and a coupler locking projection to be fitted into the locking groove is provided on the inner peripheral surface of the corrugated retainer, and the coupler lock is engaged on the inner peripheral surface of the corrugated retainer. An electric wire shield structure in which an elastic rib that elastically contacts the other side wall surface of the locking groove is provided so as to press the protrusion against one side wall surface of the locking groove.