JP3032954B2 - Wire shield structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of an electric wire configured to obtain the same shielding effect as that obtained by using a shielded wire without using a shielded wire.

[0002]

2. Description of the Related Art Conventionally, various shield structures for electric wires have been known. For example, those disclosed in Japanese Utility Model Laid-Open No. 62-152629 shown in FIG. 7 and those shown in FIG. 8 are known. As shown in FIG. 7, the electric wire shield structure 51 is such that the electric wire 4 such as a wire harness is wound and covered by a shield tape 54 made of an insulating material 53 such as a soft synthetic resin material sandwiching a metal foil 52 inside. The eyelet fitting 5 is inserted into the hole of the drawn-out portion 55 of the shield tape 54 drawn out from the wound covering portion.
6 a ground wire 58 having a ground terminal 57 at the tip
Lug terminals 59 for stopping the connection are tightened together. Therefore, the metal foil 52 in the shield tape 54 is electrically connected to the earth terminal 57 via the eyelet fitting 56, the lug terminal 59, and the earth wire 58.

In the shield structure having the above construction, when the ground terminal 57 is connected to the locking hole 60 of the ground plate 5 by a bolt or the like, the electric wire 4 is protected from external electromagnetic noise by the shield tape 54, and The generated drain can be reliably short-circuited to the ground plate 5.

[0004] Next, the shield structure 7 of the electric wire shown in FIG.
Reference numeral 1 denotes a drain of an electric wire 4 such as a wire harness, which is made of a synthetic resin material or a conductive synthetic resin material whose surface is plated with metal and is inserted into a corrugated tube 3 having a slit 2 cut in an axial direction. A short circuit is made to the ground plane 5. That is, a part of the corrugated tube 3 is
A clamp 72 having a contact rib 6 on the inside and a locking anchor 7 on the outside is pressed from the outer periphery. The clamp 72 is made of a synthetic resin material whose surface is plated with metal or a conductive synthetic resin material.

More specifically, the clamp 72 is split into two parts by a flexible hinge 13 so that it can be opened and closed. The two fitting surfaces 9a and 9 each have a hook-shaped locking piece 14, Locking projection 15 for locking this lock piece 14
Is provided. The ground plate 5 is provided with a locking hole 16 for locking the locking anchor 7.

In the above-described shield structure,
First, the slit 2 of the corrugated tube 3 is opened, and an electric wire 4 such as a wire harness is inserted. Then, the clamp 72 is mounted on the corrugated tube 3 near the locking hole 16. That is, the clamp 7 opened by the hinge 13
2 is brought into contact with the corrugated tube 3 and the hinge 13
When the lock piece 14 is rotated and closed by the
5 locked. Then, the locking anchor 7 is fixed to the locking hole 16.
, The generation drain is electrically connected to the ground plate 5.

[0007]

However, in the above-described conventional electric wire shield structure, first, in the case of the conventional example shown in FIG. Connect lug terminal 59 to eyelet fitting 5
The work of caulking in step 6 is required. Further, it is necessary to bolt the ground terminal 57 to the locking hole 60 of the ground plate 5, and there is a problem that the number of steps is large and the workability is poor. Furthermore, there is a problem that the cost is increased due to the large number of parts.

Next, in the case of the prior art shown in FIG. 8, since the outer wall of the corrugated tube 3 is in contact with the contact rib 6, it is electrically connected to the ground plate 5 via the locking anchor 7. However, the connection with the inner wall is insufficient. That is, since it is only pressed from the outside, there is a backlash or the like, and it is difficult to obtain a reliable contact force. Therefore, there is a problem that the drain generated from the electric wire 4 can hardly be short-circuited to the ground plate 5.

An object of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a shield structure of an electric wire in which the number of parts is small, workability is good, and a generated drain can be reliably short-circuited to a ground plate. .

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a corrugated tube made of a synthetic resin material or a conductive synthetic resin material having a metal layer formed on a surface thereof and having a slit in an axial direction. In order to short the generated drain of the electric wire to the ground plate, in the electric wire shielding structure, a part of the outer periphery of the corrugated tube is pressed by a clamp having a contact rib on the inside and a locking portion on the outside. This can be achieved by a shield structure of an electric wire, wherein an inner pressing plate having a rib directed toward an inner wall via a support portion is provided inside the clamp.

According to the electric wire shield structure having the above structure,
The inner wall of the corrugated tube is pressed against the inner pressing plate and the ribs, and the outer wall is pressed against the contact ribs, so that the inner wall of the corrugated tube is electrically connected to the ground plate via the clamp support and locking portion. Is securely connected. Accordingly, the electric wire is protected from external electromagnetic noise, and the generated drain can be reliably short-circuited to the ground plate, so that a highly reliable shield structure can be obtained. In addition, since the inner pressing plate is provided near the fitting surface, the corrugated tube can be reliably sandwiched from inside and outside of the fitting surface of the clamp. Also,
Since the main parts other than the corrugated tube are provided integrally with the clamp, the number of parts can be reduced as compared with the conventional case. Therefore, it is possible to improve the working efficiency and reduce the manufacturing cost.

Further, the clamp is a connector fitting clamp for covering a part of the electric wire provided at a front end thereof with a connector to be connected to a metal box with a fixed ground, and a part of the corrugated tube through which the electric wire is inserted. This can be achieved by providing a locking portion connected to the metal box at the front end of the connector fitting clamp.

[0013] According to the above configuration, since the locking portion in addition to the connector is connected to the metal box whose ground is determined, the inner wall of the corrugated tube is more securely electrically connected to the metal box. Therefore, the drain for generating the electric wire is more reliably short-circuited to the metal box, so that the reliability of the shield structure is further improved.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a shield structure of an electric wire according to the present invention. FIG. FIG. 1 is an exploded perspective view showing a first embodiment of the electric wire shield structure of the present invention, FIG. 2 is a sectional view of the clamp in FIG. 1 in an open state, FIG. 3 is a sectional view in FIG. 1, and FIG. 1, FIG. 5 is an exploded perspective view showing a second embodiment of the electric wire shield structure of the present invention, and FIG. 6 is an assembled perspective view in FIG.

As shown in FIGS. 1 to 4, a shield structure 1 of an electric wire is made of a synthetic resin material or a conductive synthetic resin material whose surface is plated with metal, and has a slit 2 cut in an axial direction. This is for short-circuiting the generation drain of the electric wire 4 such as a wire harness inserted into the ground plate 5. Specifically, corrugated tube 3
Is a shield structure which is pressed from the outer periphery by a clamp 8 provided with a contact rib 6 on the inside and a locking anchor 7 on the outside.

A feature of the present embodiment is that an inner holding plate 10 having a rib 12 directed to an inner wall via a support portion 11 is provided inside the vicinity of the fitting surface 9 of the clamp 8. is there. The clamp 8 is made of a synthetic resin material whose surface is plated with metal or a conductive synthetic resin material.

More specifically, the clamp 8 is split into two parts by a flexible hinge 13 so as to be openable and closable. The two fitting surfaces 9 and 9a are provided with hook-shaped lock pieces 14 respectively. A locking projection 15 for locking the lock piece 14 is provided. The grounding plate 5 is provided with a locking hole 16 for locking the locking anchor 7.

In the shield structure of the first embodiment having the above-described structure, first, the slit 2 of the corrugated tube 3 is opened, and the electric wire 4 such as a wire harness is inserted.
Then, the clamp 8 is attached to the corrugated tube 3 near the locking hole 16. Specifically, when the inner holding plate 10 of the clamp 8 opened by the hinge 13 is pushed into the inner wall of the corrugated tube 3 from the slit 2 that has been pryed open, the support portion 11 is held by the slit 2. And
When the clamp 8 is rotated and closed by the hinge 13, the lock piece 14 is locked by the locking projection 15. When the locking anchor 7 is mounted in the locking hole 16, the ribs 12 and the contact ribs 6 come into contact with and press against the inner and outer walls of the corrugated tube 3, respectively. It is electrically connected to the main plate 5.

As is clear from the above description, the electric wire 4 comes into contact with the inner holding plate 10 and the inner wall of the corrugated tube 3 and the inner wall of the corrugated tube 3 is held in the holding plate 1.
The outer wall of the corrugated tube 3 is pressed by the contact rib 6. Accordingly, the corrugated tube 3 is reliably connected to the ground plate 5 via the support portion 11 and the locking anchor 7. Therefore, the drain of the electric wire 4 is reliably short-circuited to the ground plate, so that a highly reliable shield structure can be obtained. In addition, since the main parts other than the corrugated tube 3 are provided integrally with the clamp 8, the number of parts is reduced as compared with the conventional shield structure, so that work efficiency can be improved and manufacturing costs can be reduced.

Next, the second embodiment of the electric wire shield structure of the present invention will be described.
An embodiment will be described with reference to FIGS. The electric wire shield structure 21 of the present embodiment includes: an electric wire 4 provided with a connector 23 at the front end where the clamp is connected to a metal box 22 having a fixed ground;
Is performed by a connector fitting clamp 24 that covers a part of the corrugated tube 3 into which the corrugated tube 3 is inserted. Also,
At the front end of the connector fitting clamp 24, a through lock 25 connected to the metal box 22 and the locking anchor 26 are provided.

More specifically, connector fitting clamp 2
A plurality of lock pieces 27 each having a lock hole 28 and a plurality of lock projections 29 are provided on the side of the fitting surfaces 9 and 9a of the 4. Further, a locking hole 30 is provided on the connector fitting clamp 24 immediately after the through lock 25 so as to be locked by a locking projection 31 provided on the connector 23. Further, a mating connector 3 to be connected to the connector 23 is provided in the metal box 22 of the mating partner.
2, a locking hole 33 that engages with the locking anchor 26,
A lock piece 34 for locking the through lock 25 is provided. Other components are the same as those of the shield structure 1 in the first embodiment, and the same components are denoted by the same reference numerals in FIGS.

In the above-described shield structure,
First, an electric wire 4 such as a wire harness in which a slit 2 of a corrugated tube 3 is opened and a connector 23 is connected to a front end.
Is inserted. Then, the connector fitting clamp 24 is attached to the connector 23 and the front end of the corrugated tube 3. Specifically, when the inner holding plate 10 of the connector fitting clamp 24 opened by the hinge 13 is pushed into the inner wall of the corrugated tube 3 from the slit 2 that has been pryed open, the support portion 11 is sandwiched by the slit 2.

Further, when the connector fitting clamp 24 is turned by the hinge 13 and closed, a plurality of lock holes 28 are formed.
Are locked by a plurality of locking projections 29, and the connector 23 is locked by the locking projections 31 with the locking holes 3 of the connector fitting clamp 24.
Locked to zero. When the connector 23 is pressed and connected to the mating connector 32 of the metal box 22, the locking anchor 26 is inserted into the locking hole 33, and the through lock 25 is also locked by the lock piece 34. At this time, the rib 12
The contact ribs 6 are pressed against the inner and outer walls of the corrugated tube 3 respectively, so that the electric wires 4 and the inner wall of the corrugated tube 3 are electrically connected to the metal box 22 whose grounding is determined.

According to the above description, in addition to the connector 23, the through lock 25 and the locking anchor 26 are connected to the metal box 22 whose ground has been established, so that the inner wall of the corrugated tube 3 is electrically connected to the metal box 22. Connected more securely. Therefore, the drain for generating the electric wire 4 is more reliably short-circuited to the metal box 22, so that a more reliable shield structure can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. For example, the clamp 8 is split into two by the hinge 13 in the first embodiment, but may be divided into two or more.

[0026]

As described above, according to the electric wire shield structure of the present invention, the inner pressing plate having the rib directed toward the inner wall via the support portion inside the vicinity of the fitting surface of the clamp has the fitting surface. It is provided in the vicinity. Therefore, the inner wall of the corrugated tube comes into contact with the inner pressing plate and the rib and is pressed, and the outer wall comes into contact with the contact rib and is pressed.Therefore, the inner wall of the corrugated tube passes through the support portion and the locking portion of the clamp. It is securely connected electrically to the ground plate. Therefore, the electric wire is protected from external electromagnetic noise, and the generated drain can be reliably short-circuited to the ground plate, so that a highly reliable shield structure can be obtained. In addition, since the main parts other than the corrugated tube are provided integrally with the clamp, the number of parts of the shield structure can be reduced, and the working efficiency can be improved and the manufacturing cost can be reduced.

Further, in the electric wire shielding structure in which the connector is provided at the front end of the electric wire, the locking portion is connected to the metal box whose grounding is determined in addition to the connector, so that the inner wall of the corrugated tube is formed of the metal box. Electrically more reliably. Therefore, the drain for generating the electric wire is more reliably short-circuited to the metal box, so that a more reliable shield structure can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a shield structure of an electric wire according to the present invention.

FIG. 2 is a cross-sectional view of the clamp in FIG. 1 in an open state.

FIG. 3 is a sectional view of an assembled state in FIG. 1;

FIG. 4 is a perspective view of an assembled state in FIG. 1;

FIG. 5 is an exploded perspective view showing a second embodiment of the electric wire shield structure of the present invention.

FIG. 6 is a perspective view of an assembled state in FIG. 5;

FIG. 7 is a perspective view showing an example of a conventional electric wire shield structure.

FIG. 8 is an exploded perspective view showing another example of the conventional electric wire shield structure.

[Explanation of symbols]

 1, 21 Wire shield structure 2 Slit 3 Corrugated tube 4 Wire 5 Ground plate 6 Contact rib 7, 26 Locking anchor (locking portion) 8 Clamp 9 Fitting surface 10 Inner holding plate 11 Supporting portion 12 Rib 22 Metal box 23 Connector 24 Connector fitting clamp 25 Through lock (locking part)

Claims (3)

(57) [Claims] 1. A short-circuit to a ground plate is made of a synthetic resin material or a conductive synthetic resin material having a metal layer formed on the surface thereof, and the wire is drained through an axially slit corrugated tube and inserted into a corrugated tube. In order to perform the above, in a wire shield structure in which a part of the outer periphery of the corrugated tube is pressed by a clamp provided with a contact rib on the inside and a locking portion on the outside, A shield structure for an electric wire, wherein an inner pressing plate having a directed rib is provided. 2. The electric wire shield structure according to claim 1, wherein the inner pressing plate is provided near a fitting surface. 3. The connector fitting clamp for covering a part of the electric wire provided at a front end with a connector to be connected to a metal box whose ground is fixed, and a part of the corrugated tube through which the electric wire is inserted. And a locking portion connected to the metal box at a front end of the connector fitting clamp.
The shield structure of the described electric wire.