JP2012175879A - Wire harness, electric wire protection tube, and shield structure of wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify operation to mount a member for actualizing protection of an electromagnetic shield and an electric wire without sacrificing the flexibility of a wiring path for a wire harness connected to electrical equipment.SOLUTION: An electric wire protection tube 30 of a wire harness 1 includes an inside shield part 50 and an exterior part 40. The inside shield part 50 is a member which is formed of a conductor formed in a bellows type cylindrical shape and in which an electric wire runs. The exterior part 40 is a member which is formed in a cylindrical shape coming into contact with an outer peripheral surface of the inside shield part 50. For example, the inside shield part 50 is a metallic member which is formed in a bellows type cylindrical shape. The exterior part 40 is a cylindrical elastic member having an uneven inner surface mating with an uneven outer surface that a bellows structure of the inside shield part 50 forms.

Description

  The present invention relates to a wire harness including an electric wire and an electric wire protection tube covering the periphery of the electric wire, an electric wire protection tube, and a shield structure for the wire harness.

  A wire harness mounted on a vehicle such as an automobile often has an electric wire, a shield member that covers the periphery of the electric wire, and a terminal provided at the end of the electric wire for electromagnetic shielding of the electric wire. A general shield member is a braided wire. Such a wire harness has its end inserted into the housing of the electrical equipment through the opening, and the terminal at the end is connected to a terminal block housed in the housing of the electrical equipment. Further, the shield member is electrically connected to a conductive casing in the electrical equipment at the end of the electric wire.

  For example, the wire harness shown in Patent Document 1 includes a metal shield case attached to an electric wire in a state of contact with a braided wire. The shield case is screwed to the metal casing, so that the braided wire and the casing are electrically connected. The shield case is attached to the end portion of the electric wire covered with the braided wire by caulking metal fittings.

  Moreover, in a conventional wire harness, a corrugated tube is often employed as a flexible wire protector. Since the corrugated tube is an electric wire protector formed in a bellows type cylindrical shape, it has flexibility in the longitudinal direction. Therefore, the corrugated tube can protect the electric wire without sacrificing the degree of freedom of the wiring path.

  Conventionally, a wire harness that requires both protection of an electric wire and electromagnetic shielding of the electric wire often includes a braided wire as shown in Patent Document 1 and a corrugated tube. In addition, a metal pipe may be used as an electric wire protection tube that also functions as an electromagnetic shield.

JP 2002-134953 A

  When a conventional general wire harness requires both protection of the electric wire and electromagnetic shielding of the electric wire, a braided wire and a corrugated tube are attached to the electric wire, and the braided wire is attached to the housing of the electrical equipment. It requires a complicated work of screwing to the screw. Moreover, when a metal pipe is used as an electric wire protection tube, the freedom degree of a wiring path is sacrificed. That is, the conventional wire harness has a problem that a complicated operation is required to realize the electromagnetic shield and the protection of the electric wire, or the degree of freedom of the wiring path is sacrificed.

  It is an object of the present invention to simplify the work of mounting a member for realizing protection of an electromagnetic shield and an electric wire without sacrificing the degree of freedom of a wiring path in a wire harness connected to an electrical equipment. .

The wire harness which concerns on this invention is equipped with an electric wire and the electric wire protection tube which covers the circumference | surroundings of the electric wire, and also the electric wire protection tube is provided with each component shown below.
(1-1) The first component is an inner shield part which is made of a conductor formed in a bellows-type cylindrical shape and has an electric wire passed through the inside.
(1-2) The second component is an exterior part formed in a cylindrical shape in close contact with the outer peripheral surface of the inner shield part.

  Moreover, in the wire harness which concerns on this invention, it is possible that an inner side shield part and an exterior part are provided with the following structures. That is, the inner shield part is a metal member formed in a bellows type cylindrical shape. Further, the exterior portion is a cylindrical elastic member in which an uneven inner surface that fits with an uneven outer surface formed by the bellows structure in the inner shield portion is formed.

  Further, in the wire harness according to the present invention, when the exterior part is a cylindrical elastic member, a connection part that covers the edge part of the wire introduction port in the casing of the electrical equipment is formed at the end part of the exterior part. It is possible that

  Moreover, in the wire harness which concerns on this invention, it is possible that an inner side shield part and an exterior part are provided with the following structures. That is, the inner shield part is a metal member formed in a bellows type cylindrical shape. Further, the exterior portion is a resin coating formed along the outer surface of the inner shield portion.

  Moreover, in the wire harness which concerns on this invention, it is possible that an inner side shield part and an exterior part are provided with the following structures. That is, the exterior part is a metal member formed in a bellows type cylindrical shape. The inner shield part is a metal member that is formed in a bellows-type cylindrical shape along the inner side surface of the exterior part and has a higher conductivity than the exterior part.

Moreover, this invention can also be grasped | ascertained as invention of the electric wire protection tube with which the wire harness which concerns on this invention is provided. That is, the electric wire protection tube according to the present invention is a tube that covers the periphery of an electric wire, and includes the following components.
(2-1) The first component is an inner shield part made of a conductor formed in a bellows type cylindrical shape.
(2-2) The second component is an exterior part formed in a cylindrical shape in close contact with the outer peripheral surface of the inner shield part.

Moreover, this invention can also be grasped | ascertained as invention of the shield structure of the wire harness which concerns on this invention. That is, the shield structure for a wire harness according to the present invention includes the following components.
(3-1) The first component is an inner shield part that constitutes a part of the electric wire protection tube, is made of a conductor formed in a bellows-like cylindrical shape, and the electric wire is passed through the inner side.
(3-2) The second component is an exterior part that forms a part of the wire protection tube and is formed in a cylindrical shape that is in close contact with the outer peripheral surface of the inner shield part.
(3-3) The third component is an uneven inner surface formed by the bellows structure in the inner shield part that protrudes from the edge of the wire inlet in the conductive casing of the electrical equipment to the inside of the inner shield part. It is the shield connection part which consists of a conductor in which the convex part or recessed part which fits the concave part or convex part of this was formed.

  In the wire harness according to the present invention, the electric wire protection tube has a structure in which an inner shield part that mainly functions as an electromagnetic shield and an exterior part that mainly functions as an electric wire are in close contact with each other and are integrally held. is doing. Therefore, the members relating to both the electromagnetic shield and the electric wire protection are collectively attached to the electric wires by a simple operation of passing the electric wires through the electric wire protection tube.

  Moreover, in this invention, since the electric wire protection tube has a bellows structure, even when comprised with a material with comparatively high intensity | strength, it has the flexibility in a longitudinal direction. Therefore, according to the present invention, the degree of freedom of the wiring path is not sacrificed.

  Moreover, the inner surface of the electric wire protection tube is an uneven surface formed by the bellows structure of the inner shield part. Therefore, according to the present invention, as a mechanism for electrically connecting the inner shield part of the wire protection tube to the housing of the electrical equipment, the uneven surface inside the wire protection tube and the housing of the electrical equipment A fitting mechanism with a concave portion or a convex portion formed in the protruding portion can be employed. Thereby, simplification of the operation | work which electrically connects an inner side shield part with respect to the housing | casing of an electrical equipment is attained.

  Further, in the present invention, if the inner shield part is a metal member, and the exterior part is a cylindrical elastic member formed with an uneven inner surface that fits with the uneven outer surface of the inner shield part, the following An effect is obtained. In this case, since the exterior part has a buffer function, it is possible to prevent the electric wire protection tube from coming into contact with surrounding objects and generating abnormal noise. Furthermore, if the connection part which covers the edge part of the electric wire inlet in the housing | casing of an electrical equipment is formed in the edge part of the exterior part which consists of elastic members, such as rubber | gum, an electric wire protection tube will be in an electric wire and an electrical equipment inside Provides a waterproof function to prevent water from entering.

  Further, in the present invention, when the inner shield part is a metal member and the exterior part is coated with resin, the performance of wire protection is improved as compared with the case where the exterior part is an elastic member such as rubber.

  By the way, metals such as iron having a relatively low conductivity are less expensive than metals such as copper having a high conductivity. In the present invention, if the exterior part is a metal member having a relatively low electrical conductivity and the inner shield part is a metal member having a higher electrical conductivity than the exterior part, the wire is inexpensive and has a high wire protection performance. A protective tube can be realized.

1 is a perspective view of a wire harness 1 according to a first embodiment of the present invention. 1 is a longitudinal sectional view of a wire harness 1. FIG. It is an exploded sectional view of electric wire protection tube 30 with which wire harness 1 is provided. It is a perspective view of wire harness 1A concerning a 2nd embodiment of the present invention. 1 is a longitudinal sectional view of a wire harness 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

<First Embodiment>
First, the wire harness 1 according to the first embodiment of the present invention and the wire protection tube according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the wire harness 1 includes a plurality of electric wires 10 in which an insulating coating is formed around a core wire and terminals 20 are provided at the ends, and an electric wire protection tube 30 that covers the periphery of the electric wires 10. It has.

  The electric wire 10 has a core wire that is a long conductor and an insulating coating that is an insulator covering the periphery of the core wire. The end of the electric wire 10 to which the terminal 20 is attached is processed in a state where the insulation coating has been peeled off from the periphery of the core wire for a certain length in advance, that is, the core wire for a certain length has been extended from the insulation coating. Has been. The core wire is electrically connected to the terminal 20. The core wire of the electric wire 10 is, for example, a metal wire material mainly composed of copper or aluminum.

  The terminal 20 at the end of the electric wire 10 in the wire harness 1 is inserted from an electric wire introduction port 74 formed in the conductive casing 70 in the electrical equipment, and is connected to a terminal block 80 arranged in the casing 70. . The housing 70 is made of, for example, a metal (conductor) such as aluminum, stainless steel, or copper, and the terminal block 80 relays electrical connection between the electric wire 10 and an electronic component (not shown). In FIG. 2, the housing 70 of the electrical equipment and the terminal block 80 arranged in the housing 70 are indicated by virtual lines (two-dot chain lines). In the example shown in FIG. 2, the terminal 20 of the electric wire 10 is fixed to the terminal block 80 with screws.

<Wire protection tube>
The electric wire protection tube 30 has a double structure including an exterior portion 40 that forms an outer surface and an inner shield portion 50 that forms an inner surface.

<Wire protection tube: Inner shield part>
The inner shield part 50 is a member made of an electric conductor formed in a bellows type cylindrical shape. In the wire harness 1, the electric wire 10 is passed through the inner shield 50. In the present embodiment, the inner shield part 50 is a metal member formed in a bellows type cylindrical shape. That is, the inner shield part 50 has a bellows structure in which protruding parts and dent parts are alternately and continuously formed on the surface along the longitudinal direction thereof. The inner shield part 50 is a metal member having high conductivity such as copper, a copper alloy, or aluminum.

  As shown in FIGS. 2 and 3, in the inner shield part 50, the concave part 51 on the inner side surface forms a convex part 52 on the outer side surface at the back side. Similarly, in the inner shield part 50, the convex part on the inner side surface forms a concave part on the outer side surface at the back side.

  Since the inner shield part 50 is a conductor that covers the periphery of the electric wire 10, the inner shield part 50 is electrically connected to the conductive casing 70 in the electrical equipment, thereby propagating electromagnetic noise between the electric wire 10 and the outside. Shield.

  Since the inner shield part 50 has a bellows structure, the inner shield part 50 has flexibility that is easy to bend in the longitudinal direction. However, in order for the inner shield part 50 to have flexibility, the thickness of the inner shield part 50 is limited. Moreover, the metal inner shield part 50 does not have insulation and buffering properties. Therefore, the electric wire protection tube 30 is provided with the exterior part 40 in order to implement | achieve the insulation and buffering property in the outer surface.

<Wire protection tube: exterior>
The exterior part 40 is a member formed in a cylindrical shape in close contact with the outer peripheral surface of the inner shield part 50. In the present embodiment, the exterior part 40 includes a main body part 41 having a relatively small outer diameter and a connection part 42 having a relatively large outer diameter. The main body portion 41 is a portion formed around the inner shield portion 50. That is, the exterior part 40 has the same configuration as a so-called rubber boot.

  In this embodiment, the exterior part 40 is a cylindrical elastic member in which an uneven inner surface that fits with an uneven outer surface formed by the bellows structure in the inner shield part 50 is formed. FIG. 2 shows a state in which the plurality of convex portions 52 on the outer side surface of the inner shield portion 50 are fitted into the plurality of concave portions 43 formed on the inner side surface of the main body portion 41 in the exterior portion 40. The exterior portion 40 is preferably an elastically deformable insulating member, for example, a member made of rubber such as fluorine rubber, silicone rubber, or acrylic rubber. In the present embodiment, the outer surface of the exterior part 40 may have any shape.

  Further, in the electric wire protection tube 30, a tube formed at the edge of the electric wire introduction port 74 in the housing 70 of the electrical equipment at the end of the exterior portion 40, that is, at the outlet portion of the electric wire 10 in the electric wire protection tube 30. A connecting portion 72 is formed to cover the shape portion 71.

  Hereinafter, the assembly method of the electric wire protection tube 30 is demonstrated, referring FIG. As shown in FIG. 3, in the assembly process of the wire protection tube 30, first, the exterior part 40 made of an elastic body is stretched so that the diameter thereof is enlarged. Next, the inner shield part 50 is inserted inside the stretched exterior part 40. Then, the stretched exterior portion 40 is contracted to the original state. As a result, the plurality of convex portions 52 on the outer side surface of the inner shield portion 50 fit into the plurality of concave portions 43 formed on the inner side surface of the main body portion 41 in the outer portion 40, and the inner shield portion 50 and the outer portion 40 are brought together. Merge. Further, the fitting mechanism between the convex portion 52 and the concave portion 43 prevents the position of the exterior portion 40 from being displaced with respect to the inner shield portion 50.

<Shielding mechanism of wire harness>
Next, the shield mechanism of the wire harness 1 will be described with reference to FIG. The shield mechanism of the wire harness 1 includes an inner shield part 50 and an exterior part 40 in the electric wire protection tube 30, and a shield connection part 72 formed in a conductive casing 70 in the electrical equipment. In addition, since the housing | casing 70 of an electrical equipment is a conductor, the shield connection part 72 which comprises a part is also the same conductor.

  The shield connection portion 72 is formed so as to protrude from the edge portion of the wire introduction port 74 in the housing 70 of the electrical equipment to the inside of the inner shield portion 50 in the wire protection tube 30. In the example shown in FIG. 2, the shield connection portion 72 protrudes from the edge portion of the wire introduction port 74 in the housing 70 through the tubular portion 71 and is formed in a tubular shape.

  Further, on the outer surface of the cylindrical shield connection portion 72, an annular convex portion 73 is formed that fits with the concave portion 51 on the concave inner surface formed by the bellows structure in the inner shield portion 50. The inner shield part 50 and the housing 70 of the electrical equipment are electrically connected by the fitting mechanism of the inner shield part 50 and the shield connection part 72, and the end of the wire protection tube 30 is connected to the housing of the electrical equipment. It is held by the body 70.

<Effect>
In the wire harness 1, the electric wire protection tube 30 has a structure in which an inner shield part 50 that mainly functions as an electromagnetic shield and an exterior part 40 that mainly functions as an electric wire protection are held in close contact with each other. is doing. Therefore, members relating to both the electromagnetic shield and the protection of the electric wires are attached to the electric wires 10 at once by a simple operation of passing the electric wires 10 through the electric wire protection tube 30.

  In the wire harness 1, the inner shield part 50 of the electric wire protection tube 30 has a bellows structure, and therefore has flexibility in the longitudinal direction even when it is made of a material having a relatively high strength. Therefore, when the wire harness 1 is employed, the degree of freedom of the wiring path is not sacrificed as in the case where a metal pipe is employed.

  Further, the inner side surface of the wire protection tube 30 is an uneven surface formed by the bellows structure of the inner shield part 50. As a mechanism for electrically connecting the inner shield part 50 of the wire protection tube 30 to the housing 70 of the electrical equipment, the uneven surface inside the wire protection tube 30 and the shield connection part of the housing 70 of the electrical equipment The fitting mechanism with the convex part 73 formed in 72 can be employed. Thereby, the operation | work which electrically connects the inner side shield part 50 with respect to the housing | casing 70 of an electrical equipment can be simplified.

  Moreover, since the exterior part 40 which is an elastic member has a buffer function, it is prevented that the electric wire protection tube 30 contacts with a surrounding thing and an abnormal noise arises. Furthermore, since the connection part 42 is formed in the edge part of the exterior part 40, the wire protection tube 30 exhibits the waterproof function which prevents the electric wire 10 and the inside of an electrical equipment from being flooded.

Second Embodiment
Next, the wire harness 1A according to the second embodiment of the present invention and the wire protection tube 30A according to the second embodiment of the present invention will be described with reference to FIGS. This wire harness 1A is different from the wire harness 1 shown in FIGS. 1 to 3 only in that the wire harness 1A includes a wire protection tube 30A that is a modified example of the wire protection tube 30. 4 and 5, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals. Hereinafter, only different points of the wire harness 1A from the wire harness 1 will be described.

<Wire protection tube>
Similarly to the wire protection tube 30, the wire protection tube 30 </ b> A included in the wire harness 1 </ b> A has a double structure including an exterior portion 40 </ b> A that forms an outer surface and an inner shield portion 50 that forms an inner surface. Yes.

<Wire protection tube: Inner shield part>
The inner shield part 50 is a member made of an electric conductor formed in a bellows type cylindrical shape. Also in the present embodiment, the inner shield part 50 is a metal member formed in a bellows type cylindrical shape. The inner shield part 50 is a metal member having high conductivity such as copper, a copper alloy, or aluminum. Due to this bellows structure, the inner shield part 50 is flexible so as to be easily bent in the longitudinal direction.

<Wire protection tube: exterior>
The exterior portion 40 </ b> A is a member formed in a cylindrical shape that is in close contact with the outer peripheral surface of the inner shield portion 50. In the present embodiment, the exterior portion 40A is a resin coating formed along the outer surface of the inner shield portion 50. Therefore, the exterior portion 40A is formed in a bellows type cylindrical shape having an uneven inner surface that fits with the uneven outer surface formed by the bellows structure in the inner shield portion 50. The exterior portion 40A is a coating made of a resin having a certain degree of flexibility, such as polyamide (PA), polypropylene (PP), polybutylene terephthalate (PBT), or ABS resin. The exterior portion 40A is formed by, for example, two-color molding of resin for the inner shield portion 50.

<Shielding mechanism of wire harness>
Next, the shield mechanism of the wire harness 1A will be described with reference to FIG. The shield mechanism of the wire harness 1 </ b> A is the same as the shield mechanism of the wire harness 1. That is, the shield mechanism of the wire harness 1A includes the inner shield part 50 and the exterior part 40A in the electric wire protection tube 30A, and the shield connection part 72 formed in the conductive casing 70 in the electrical equipment.

  The shield connecting portion 72 is formed with an annular convex portion 73 that fits into the concave portion 51 on the concave inner surface formed by the bellows structure in the inner shield portion 50. The inner shield part 50 and the housing 70 of the electrical equipment are electrically connected by the fitting mechanism of the inner shield part 50 and the shield connection part 72, and the end of the wire protection tube 30A is connected to the housing of the electrical equipment. It is held by the body 70.

<Effect>
By adopting the wire harness 1A, as in the case where the wire harness 1 is employed, an operation of mounting a member for realizing the electromagnetic shield and the protection of the electric wire without sacrificing the degree of freedom of the wiring path. The effect that can be simplified is obtained. Moreover, since the exterior part 40A is a resin coating, the performance of wire protection is higher than that of the exterior part 40, which is an elastic member.

<Third Embodiment>
Moreover, as 3rd Embodiment of this invention, it is also considered that the electric wire protection tube 30A with which the wire harness 1A is provided is provided with the metal inner shield part 50 and the metal exterior part 40A. In this case, the exterior portion 40A is a metal member formed in a bellows type cylindrical shape. The inner shield part 50 is a metal member that is formed in a bellows-like cylindrical shape along the inner surface of the exterior part 40A and has a higher conductivity than the exterior part 40A.

  In the present embodiment, for example, the exterior portion 40A is a metal member such as iron having relatively low conductivity. On the other hand, the inner shield part 50 is made of a metal such as copper or a copper alloy having high conductivity. In the present embodiment, the metal exterior portion 40A functions as a structure that holds the shape of the wire protection tube 30A. Therefore, the inner shield part 50 may have a cylindrical shape that is thinner than the exterior part 40A. For example, the inner shield part 50 may be a metal film welded to the inner side surface of the exterior part 40A, or a braided wire formed along the inner side surface of the exterior part 40A.

  Metals such as iron with low conductivity are less expensive than metals such as copper with high conductivity. Therefore, according to the present embodiment, it is possible to realize an electric wire protection tube that is inexpensive and has high electric wire protection performance.

<Others>
In the embodiment shown in FIGS. 2 and 5, the fitting mechanism between the inner shield part 50 and the shield connection part 72 is constituted by the concave part 51 on the inner side surface of the inner shield part 50 and the annular convex part 73. Has been. However, the fitting mechanism between the inner shield part 50 and the shield connection part 72 may be configured by a convex part on the inner surface of the inner shield part 50 and a concave part formed in the shield connection part 72.

DESCRIPTION OF SYMBOLS 1,1A Wire harness 10 Electric wire 20 Terminal 30, 30A Electric wire protection tube 40, 40A Exterior part 41 Body part of exterior part 42 Connection part of exterior part 43 Concave part of inner side surface of exterior part 50 Inner shield part 51 Inside shield part Concave portion on the side surface 52 Convex portion on the inner side surface of the inner shield portion 70 Case of electrical equipment 71 Cylindrical portion of the casing 72 Shield connection portion of the housing 73 Convex portion of the shield connection portion 74 Electric wire introduction port 80 Terminal block

Claims (7)

A wire harness comprising an electric wire and an electric wire protection tube covering the periphery of the electric wire,
The wire protection tube is
It consists of a conductor formed in a bellows-shaped cylindrical shape, and an inner shield part in which the electric wire is passed inside,
A wire harness comprising: an exterior portion formed in a cylindrical shape in close contact with the outer peripheral surface of the inner shield portion. The inner shield part is a metal member formed in a bellows-like cylindrical shape,
2. The wire harness according to claim 1, wherein the exterior portion is a cylindrical elastic member formed with an uneven inner surface that fits with an uneven outer surface formed by the bellows structure in the inner shield portion.   The wire harness according to claim 2, wherein a connecting portion is formed at an end portion of the exterior portion so as to cover an edge portion of the electric wire introduction port in the conductive casing of the electrical equipment. The inner shield part is a metal member formed in a bellows-like cylindrical shape,
The wire harness according to claim 1, wherein the exterior portion is a resin coating formed along an outer surface of the inner shield portion. The exterior part is a metal member formed in a bellows-shaped cylindrical shape,
The wire harness according to claim 1, wherein the inner shield part is a metal member that is formed in a bellows-like cylindrical shape along an inner side surface of the exterior part and has a higher conductivity than the exterior part. An electric wire protection tube covering the periphery of the electric wire,
An inner shield part made of a conductor formed in a bellows-type cylindrical shape;
An electric wire protection tube comprising: an exterior part formed in a cylindrical shape in close contact with the outer peripheral surface of the inner shield part. A shield structure of a wire harness provided with an electric wire and an electric wire protection tube covering the periphery of the electric wire,
Consists of a part of the electric wire protection tube, made of a conductor formed in a bellows type cylindrical shape, an inner shield part through which the electric wire is passed, and
A part of the electric wire protection tube, an exterior part formed in a cylindrical shape in close contact with the outer peripheral surface of the inner shield part,
A convexity that protrudes from the edge of the wire introduction port in the conductive casing of the electrical equipment to the inside of the inner shield part and fits into the concave or convex part of the concave inner surface formed by the bellows structure in the inner shield part A shield structure for a wire harness, comprising: a shield connecting portion made of a conductor in which a portion or a recess is formed.

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