JP2015090818A - Wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire harness which can prevent invasion of water from an end part where an insulation film is interrupted into the insulation film.SOLUTION: A waterproof member 5 is attached to an end part of a bundle of wires 4 coated with an insulation film 3 in a wire harness 2. The waterproof member 5 is provided with an insertion hole 51 into which the end part of the bundle of wires 4 is inserted and a plurality of through holes 52 into which the wires 4 with the insulation film 3 removed are inserted individually. The waterproof member 5 prevents passing of e.g. water through the through holes 52 when inserted with the wires 4. The waterproof member 5 is covered with a cover 6. The peripheral part of the opening of the insertion hole 51 of the waterproof member 5 inserted with the bundle of wires 4 is covered with a heat-shrinkable tube 7. The waterproof member 5 is composed of an elastic member; a protrusion part 54 is provided in the through holes 52; and a protrusion part 53 is provided in the through hole 51.

Description

  The present invention relates to a wire harness mounted on a vehicle or the like, and more particularly to a wire harness having a waterproof structure.

  A plurality of electronic devices are mounted on a vehicle or the like, and electric wires are connected to the plurality of electronic devices for power supply or signal exchange. In recent years, the number of electronic devices mounted on a vehicle has increased, and the number of electric wires arranged in the vehicle has also increased. Wire harnesses in which a plurality of electric wires are bundled are widely used for facilitating wiring work of electric wires in a vehicle.

  In Patent Document 1, when an electronic control unit and a device are connected by a wire harness, a wire harness that prevents water from entering the electronic control unit through the wires of the wire constituting the wire harness. A water stop structure has been proposed. In this water stop structure, at a position close to the electronic control unit, the electric wires constituting the wire harness are divided in the wiring direction, the terminals are respectively connected to both ends of the divided electric wires, and the terminals of the electric wire group on one side are connected to the first side. While connecting to one connector, the other terminal is connected to the second connector. A first connector fitting portion that fits into the first connector, a second connector fitting portion that fits into the second connector, one end protruding into the first connector fitting portion, and the other end fitting into the second connector The divided electric wires are connected to each other using a waterproof relay connector having a relay terminal accommodating portion that accommodates a plurality of relay terminals protruding from the portion. The other end side of the relay terminal protruding to the second connector fitting portion is passed through the individual waterproof terminal accommodating portion.

JP 2012-142180 A

  A wire harness having a configuration in which a plurality of electric wires are bundled and covered with an insulating film is widely used. For example, in the wire harness, the insulating film is removed at the end thereof (or no insulating film is provided), and a metal terminal or the like is connected to each of the exposed electric wires. At the end of the wire harness having such a configuration, moisture or the like may enter the insulating film coating from a location where the coating of the insulating film is interrupted. In the conventional wire harness, for example, the penetration of moisture and the like is prevented by covering the periphery of the portion where the insulating film is interrupted with a heat shrinkable tube.

  However, even when the end portion of the wire harness is covered with the heat-shrinkable tube, a gap that allows moisture to enter between the plurality of electric wires of the wire harness and the heat-shrinkable tube may be generated. Further, there is a possibility that a gap that allows moisture to enter between the bundled electric wires may occur. For these reasons, there is a problem that a sufficient waterproof effect cannot be obtained by the method using the heat-shrinkable tube.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wire harness capable of preventing moisture from entering from the end where the insulating film is interrupted into the insulating film. There is.

  The wire harness according to the present invention includes a wire bundle in which a plurality of electric wires are bundled and covered with an insulating film, an insertion hole into which an end of the wire bundle is inserted, and a plurality of through holes communicating with the insertion hole. A plurality of electric wires from which end portions of the wire bundle are inserted into the insertion holes of the waterproof member, and the insulating film is removed at the end portions, respectively. The waterproof member is configured to prevent moisture from passing through the through hole when the electric wire is inserted into the through hole.

  Moreover, the wire harness according to the present invention includes a covering member that covers a portion where the wire bundle is exposed from the insertion hole.

  In the wire harness according to the present invention, the covering member is a cylindrical member that contracts by heating, and a part or all of the waterproof member in which the wire bundle is inserted into the insertion hole, and the wire bundle It is characterized in that a part is housed in a cylinder and contracted by heating.

  In the wire harness according to the present invention, the waterproof member is an elastic member, and a protrusion is provided in the through hole.

  The wire harness according to the present invention is characterized in that a protrusion is provided in the insertion hole.

In the present invention, water penetration into the insulating film is prevented by attaching a waterproof member to the end of the electric wire bundle covered with the insulating film. The waterproof member is formed with an insertion hole into which the end of the wire bundle is inserted and a plurality of through holes into which the plurality of wires exposed at the end of the wire bundle from which the insulating film has been removed are individually inserted. . The plurality of through holes of the waterproof member are formed so as to communicate with the outside of the waterproof member from the bottom of the insertion hole, for example.
The waterproof member can be configured such that, for example, when an electric wire is inserted through the through hole, the inner peripheral surface of the through hole and the outer peripheral surface of the electric wire are in contact with each other without a gap. Thereby, the waterproof member can prevent moisture or the like from passing through the through hole when the electric wire is inserted into the through hole.
By attaching such a waterproof member, it is possible to prevent moisture from entering the insulating film from the gap between the electric wire and the insulating film or the gap between the plurality of electric wires at the end of the electric wire bundle.

  Moreover, in this invention, the location and its periphery which a wire bundle exposes outside from an insertion hole are covered with a coating | coated member. For example, it can be set as the structure which covers the opening periphery part of the insertion hole of the waterproof member in which the wire bundle was inserted with a coating | coated member. As the covering member, for example, a cylindrical member that contracts by heating (that is, a heat-shrinkable tube) can be used. With the electric wire bundle inserted into the insertion hole of the waterproof member, a part or all of the waterproof member and a part of the electric wire bundle are stored in the cylinder of the cylindrical member, and the cylindrical member is contracted by heating, The portion where the wire bundle is exposed to the outside and the periphery thereof can be covered. Thereby, a covering member hold | maintains a waterproof member and it can prevent that the waterproof member falls out from a wire bundle.

  In the present invention, the waterproof member is an elastic member, and the protrusion is provided in the through hole. By inserting the electric wire into the through hole, the tip of the protruding portion in the through hole is crushed, and the protruding portion can be brought into close contact with the electric wire. Thereby, it becomes possible to more reliably prevent the passage of moisture in the through hole. Moreover, in this invention, a projection part is provided in the insertion hole of a waterproof member. By inserting the wire bundle into the insertion hole, the tip of the projection in the insertion hole is crushed, and the projection can be brought into close contact with the wire bundle. Thereby, it can prevent that a water | moisture content permeates from the clearance gap between an insertion hole and an electric wire bundle.

  In the case of the present invention, the end of the wire bundle is inserted into the insertion hole of the waterproof member, and the plurality of wires included in the wire bundle are individually inserted into the plurality of through holes communicating with the insertion hole, thereby waterproofing the wire harness. By using the waterproof member, the moisture can be prevented from entering the insulating film from the gap between the electric wire and the insulating film or the gap between the plurality of electric wires at the end of the wire bundle. Therefore, it is possible to prevent moisture from entering the electronic device or the like through the insulating film of the wire harness, and to improve the reliability of a vehicle or the like using the wire harness.

It is a schematic diagram which shows one structural example of the wire harness which concerns on this Embodiment. It is a disassembled perspective view which shows the structure of the wire harness which concerns on this Embodiment. It is an enlarged view for demonstrating the waterproof structure of the wire harness which concerns on this Embodiment. It is an enlarged view for demonstrating the waterproof structure of the wire harness which concerns on this Embodiment. It is sectional drawing for demonstrating the waterproof structure of the wire harness which concerns on this Embodiment.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a schematic diagram illustrating a configuration example of the wire harness according to the present embodiment. The wire harness 2 according to the present embodiment has a configuration in which the wheel speed sensor 1 is connected to one end side (hereinafter referred to as the front side) and the socket 9 is connected to the other end side (hereinafter referred to as the rear side). The wheel speed sensor 1 has a rod-like outer shape such as a circular bar or a square bar, and a sensor element such as a Hall IC is embedded in the front side thereof. The wheel speed sensor 1 is fixed in a proper position in the vehicle so as to face, for example, a rotor that rotates integrally with the vehicle wheel, and the Hall IC outputs a signal corresponding to the rotation of the rotor. A signal output from the Hall IC is input to a control device or the like mounted on the vehicle via the two electric wires 4 included in the wire harness 2. The front end portion of the wire harness 2 is embedded in the exterior of the rod-shaped wheel speed sensor 1 and is electrically connected to the Hall IC inside the wheel speed sensor 1.

  The wire harness 2 is obtained by bundling two electric wires 4 and covering them with an insulating film 3 to form one wire. The front end of the wire harness 2 is embedded in the wheel speed sensor 1 in a state where the electric wire 4 is covered with the insulating film 3, and the electric wire 4 is connected to the Hall IC inside the wheel speed sensor 1. At the rear end of the wire harness 2, the insulating film 3 is removed to expose the electric wire 4, and a socket 9 is connected to the exposed tip of the electric wire 4. The socket 9 is for connecting the wire harness 2 to a vehicle control device or the like. The socket 9 can be configured to accommodate a plurality of metal terminals in a synthetic resin exterior, for example, and the wire 4 of the wire harness 2 is electrically connected to the metal terminal of the socket 9.

  The wire harness 2 according to the present embodiment includes a waterproof structure for preventing moisture and the like from entering the insulating film 3 from the place where the insulating film 3 is removed in order to connect the socket 9 to the electric wire 4. ing. Hereinafter, the waterproof structure of the wire harness 2 will be described. FIG. 2 is an exploded perspective view showing the configuration of the wire harness 2 according to the present embodiment. 3 and 4 are enlarged views for explaining the waterproof structure of the wire harness 2 according to the present embodiment. FIG. 3 shows a side view of the wire harness 2, and FIG. Illustrated. FIG. 5 is a cross-sectional view for explaining the waterproof structure of the wire harness 2 according to the present embodiment.

  The wire harness 2 includes a waterproof member 5, a cover 6, and a heat shrinkable tube 7 in order to realize the above waterproof structure. The waterproof member 5 has a substantially cylindrical shape, and is an elastic member formed using, for example, silicon. A cylindrical insertion hole 51 is formed on the front end face of the waterproof member 5. The insertion hole 51 is a hole for inserting the rear end portion of the wire harness 2. The diameter of the insertion hole 51 is substantially the same as or smaller than the diameter of the bundle of the electric wires 4 covered with the insulating film 3 of the wire harness 2. Further, the inner circumferential surface of the insertion hole 51 is provided with two protrusions 53 extending around the circumference. When the rear end of the wire harness 2 is inserted into the insertion hole 51, the protrusion 53 of the insertion hole 51 is crushed and closely contacts the outer peripheral surface of the insulating film 3 of the wire harness 2. Thereby, it is possible to prevent moisture from entering from the gap between the inner peripheral surface of the insertion hole 51 and the insulating film 3 of the wire harness 2. Further, the waterproof member 5 can be firmly fixed to the wire harness 2.

  On the bottom surface of the insertion hole 51 of the waterproof member 5, two through holes 52 reaching the rear end surface of the waterproof member 5 are formed substantially parallel to the axial direction. The two through holes 52 are holes through which the two electric wires 4 exposed by removing the insulating film 3 at the rear end of the wire harness 2 are inserted. On the inner peripheral surface of each through-hole 52, there are provided two protrusions 54 that extend around the circumference. When the electric wire 4 is inserted through the through hole 52, the protruding portion 54 of the through hole 52 is crushed and closely contacts the electric wire 4. Thereby, it is possible to prevent moisture and the like from entering from the gap between the inner peripheral surface of the through hole 52 and the electric wire 4, and to prevent moisture and the like from entering through the through hole 52.

  In addition, the outer peripheral surface of the waterproof member 5 is provided with four protrusions 55 extending around the circumference. The four protrusions 55 are provided at the front position in the axial direction of the waterproof member 5 and two at the rear position. The protrusion 55 is for increasing the degree of close contact with the cover 6.

  The cover 6 is a member that covers the outer peripheral surface of the waterproof member 5 and alleviates an impact on the waterproof member 5 from the outside. The cover 6 has a substantially cylindrical shape, and covers the outer peripheral surface of the waterproof member 5 by being externally fitted to the waterproof member 5, and is fixed to the waterproof member 5. The cover 6 may be bonded to the waterproof member 5 with an adhesive or the like. The substantially cylindrical cover 6 has a rear opening diameter that is narrower than the front side. As a result, it is possible to prevent the cover 6 from falling off the waterproof member 5. The two electric wires 4 extend from the rear end face of the waterproof member 5 to the outside through the rear opening of the cover 6.

  The heat-shrinkable tube 7 is a cylindrical member made of synthetic resin, and is a member that shrinks in the radial direction when heated. In the wire harness 2 according to the present embodiment, the exposed portion of the bundle of the electric wires 4 from the insertion hole 51 and the periphery thereof are covered with the heat shrinkable tube 7. That is, the opening peripheral portion of the insertion hole 51 of the waterproof member 5 is covered with the heat shrinkable tube 7. The front end and the periphery of the waterproof member 5 in which the bundle of the wires 4 covered with the insulating film 3 is inserted into the insertion hole 51 are accommodated in the tube of the heat shrinkable tube 7 before heating, and in this state, the heat shrinkable tube By heating and shrinking 7, part or all of the waterproofing member 5 and part of the insulating film 3 are covered with the heat shrinkable tube 7. Thereby, while being able to prevent a water | moisture content permeating from the insertion hole 51 of the waterproof member 5, the waterproof member 5 can be firmly fixed and falling off etc. can be prevented.

  For example, in manufacturing or assembling the wire harness 2 according to the present embodiment, the wheel speed sensor 1 is first attached to the front end portion thereof. Next, the insulating film 3 at the rear end is removed to expose the electric wire 4. Next, the exposed electric wire 4 is inserted into the through hole 52 of the waterproof member 5, and the electric wire 4 covered with the insulating film 3 is inserted into the insertion hole 51 to attach the waterproof member 5. Next, the cover 6 is attached by fitting the cover 6 from the rear side to the waterproof member 5. The waterproof member 5 may be attached after the cover 6 is attached to the waterproof member 5. Next, the heat-shrinkable tube 7 before heating is covered around the front end portion of the waterproof member 5, and the heat-shrinkable tube 7 is heated and contracted to cover the opening peripheral portion of the insertion hole 51. Next, the socket 9 is connected to the exposed end of the electric wire 4.

  The exterior portion of the wheel speed sensor 1 is formed of a synthetic resin such as nylon, for example. For example, urethane is used for the insulating film 3 of the wire harness 2. The waterproof member 5 is formed using, for example, silicon. The cover 6 is formed using, for example, nylon. For the heat-shrinkable tube 7, a thermoplastic elastomer or the like is used.

  In addition, the material of each member which comprises the wire harness 2 is not restricted to said thing, You may use a various material. For example, a material such as PBT (Poly-Butylene-Terephtalate) can be used for the exterior portion of the wheel speed sensor 1. A material such as NBR (Nitrile Butadiene Rubber) can be used for the waterproof member 5. Acrylic or the like can be used for the cover 6. For the heat-shrinkable tube 7, polyolefin or the like can be used.

  The wire harness 2 according to the present embodiment having the above configuration prevents moisture from entering the insulating film 3 by attaching the waterproof member 5 to the end of the bundle of the electric wires 4 covered with the insulating film 3. . The waterproof member 5 is formed with an insertion hole 51 into which an end of a bundle of the electric wires 4 is inserted, and a plurality of through holes 52 into which the electric wires 4 from which the insulating film 3 has been removed are individually inserted. The plurality of through holes 52 of the waterproof member 5 are formed so as to communicate with the outside of the waterproof member 5 from the bottom of the insertion hole 51. The waterproof member 5 is configured such that when the electric wire 4 is inserted into the through hole 52, the inner peripheral surface of the through hole 52 and the outer peripheral surface of the electric wire 4 are in contact with each other without any gap, so that moisture or the like can be contained in the through hole 52. Passing through can be prevented. By attaching such a waterproof member 5, moisture enters the insulating film from the gap between the electric wire 4 and the insulating film 3 or the gap between the plurality of electric wires 4 at the end from which the insulating film 3 is removed. Can be prevented.

  The waterproof member 5 is covered with a cover 6. By adopting such a double structure, for example, the waterproof member 5 and the cover 6 are formed of a material that emphasizes waterproof performance and the cover 6 is formed of a material that emphasizes strength. It becomes possible to mold with a material suitable for the purpose. Therefore, by using a high-strength material for the cover 6, it is possible to prevent damage to the waterproof member 5 due to factors such as stepping stones from the outside.

  Further, the exposed portion of the bundle of electric wires 4 from the insertion hole 51 and the periphery thereof are covered with the heat shrinkable tube 7. That is, the heat shrinkable tube 7 covers the opening peripheral portion of the insertion hole 51 of the waterproof member 5 into which the bundle of the electric wires 4 is inserted. With the bundle of wires 4 inserted into the insertion hole 51, a part or all of the waterproof member 5 and a portion of the bundle of wires 4 are stored in the tube of the heat shrinkable tube 7 before heating, and heat shrinks by heating. By contracting the tube 7, the peripheral portion of the opening of the insertion hole 51 can be covered with the heat-shrinkable tube 7. Thereby, since the heat-shrinkable tube 7 holds the waterproof member 5, it is possible to prevent the waterproof member 5 from falling off.

  Further, the waterproof member 5 is an elastic member made of silicon or the like, and the protrusion 54 is provided in the through hole 52 through which the electric wire 4 is inserted. Thereby, when the electric wire 4 is inserted through the through hole 52, the tip portion of the protrusion 54 can be crushed and brought into close contact with the electric wire 4, thereby more reliably preventing moisture from passing through the through hole 52. be able to. Further, a protrusion 53 is provided in the insertion hole 51 of the waterproof member 5. As a result, when the rear end portion of the wire harness 2 is inserted into the insertion hole 51, the distal end portion of the insertion hole 51 can be crushed and brought into close contact with the outer peripheral surface of the insulating film 3 of the wire harness 2. It is possible to prevent moisture from entering through the gap between 51 and the insulating film 3.

  In the present embodiment, the wire harness 2 includes the cover 6 and the heat-shrinkable tube 7 for a waterproof structure. However, the present invention is not limited to this. For example, the wire harness 2 may have a configuration in which the waterproof member 5 is directly covered with the heat shrinkable tube 7 without including the cover 6. Further, for example, the wire harness 2 may be configured not to include the heat shrinkable tube 7, and may be configured not to include both the cover 6 and the heat shrinkable tube 7.

  Moreover, although the heat-shrinkable tube 7 was set as the structure which coat | covers the front side of the waterproof member 5, it does not restrict to this. For example, it is good also as a structure which coat | covers the whole waterproofing member 5 with the heat contraction tube 7. FIG. Moreover, although the wire harness 2 was set as the structure which bundled two electric wires 4, it is not restricted to this, The structure which bundled three or more electric wires 4 may be sufficient. In this case, the waterproof member 5 may be formed with the same number of through holes 52 as the electric wires 4. Moreover, the shape of each member shown in FIGS. 1-5 is an example, Comprising: It does not restrict to this.

  Moreover, although the wire harness 2 was set as the structure which connects the wheel speed sensor 1 to the front side end, the wheel speed sensor 1 is an example of an electronic device, Comprising: It does not restrict to this. Various other electronic devices can be connected to the wire harness 2. Moreover, although the wire harness 2 was set as the structure which connects the socket 9 to a rear side end, it does not restrict to this. For example, the wire harness 2 may be directly connected to a control device or the like.

DESCRIPTION OF SYMBOLS 1 Wheel speed sensor 2 Wire harness 3 Insulating film 4 Electric wire 5 Waterproof member 6 Cover 7 Heat shrinkable tube (covering member)
9 Socket 51 Insertion hole 52 Through hole 53, 54, 55 Projection

Claims (5)

A bundle of wires in which a plurality of wires are bundled and covered with an insulating film;
An insertion hole into which an end of the wire bundle is inserted, and a waterproof member formed with a plurality of through holes communicating with the insertion hole,
Inserting an end portion of the wire bundle into the insertion hole of the waterproof member, and the plurality of electric wires from which the insulating film is removed at the end portion are individually inserted into the plurality of through holes,
The wire harness according to claim 1, wherein the waterproof member is configured to prevent moisture from passing through the through hole when the electric wire is inserted into the through hole. The wire harness according to claim 1, further comprising a covering member that covers a portion where the wire bundle is exposed from the insertion hole. The covering member is
It is a cylindrical member that shrinks when heated,
The part or all of the waterproof member in which the wire bundle is inserted into the insertion hole and the part of the wire bundle are accommodated in a cylinder and contracted by heating. Wire harness. The waterproof member is a member having elasticity,
The wire harness according to any one of claims 1 to 3, wherein a protrusion is provided in the through hole. The wire harness according to claim 4, wherein a protrusion is provided in the insertion hole.

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