JP2017201864A - Electrical component with harness fixing piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical component provided with a harness fixing piece of a novel structure capable of exerting a stable holding force to various types of wire harnesses having different diameter dimensions.SOLUTION: An electrical component 10 includes: a component body 14 having an insertion opening 12 for a wire harness 48; and a harness fixing piece 24 integrally projecting outward from the insertion opening 12 of the component body 14. The harness fixing piece 24 is configured by including: a base portion 26 formed integrally with the component body 14; and a topsheet portion 30 made of an elastomer material, soft and highly viscoelastic than a base portion 26, fixed to a placement surface of the wire harness 48 in the base portion 26.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electrical component including a harness fixing piece that protrudes outward from an insertion port of a wire harness and supports the wire harness.

  2. Description of the Related Art Conventionally, among electrical components such as electrical junction boxes and protectors that are used in electrical systems such as automobiles, it is widely known that a harness fixing piece protrudes from a wire harness insertion port provided in the electrical component. ing. For example, those described in JP-A-8-196016 (Patent Document 1).

  By the way, in such an electrical component, the wire harness pulled out from the electrical component is placed on the harness fixing piece and the periphery is bound with vinyl tape or a binding band, thereby stabilizing the wire harness with respect to the harness fixing piece. The tensile force transmitted to the wire harness is prevented from being transmitted to the internal electrical components, and the positioning of the components such as the protector with respect to the wire harness is stably maintained. Further, the wire harness can be bound and fixed to the harness fixing piece while the surplus length of the wire harness is absorbed inside the protector or the like, so that the surplus length can be stably maintained.

  However, since the diameter dimensions of the wire harness drawn out from the electrical components are various, if the diameter dimension of the wire harness is too large for the harness fixing piece, the wire harness is easily displaced with respect to the harness fixing piece, There was a risk that the wire harness could not be stably held. Moreover, even if the diameter dimension of the wire harness is too small, the wire harness is slippery on the harness fixing piece, and the fixing position may not be stable. In particular, in the case of a wire harness composed of a bundle of electric wires coated with a halogen-free insulating coating material in recent years, slipping of the wire harness with respect to the harness fixing piece becomes a further problem, and there is a possibility that stable holding cannot be maintained.

JP-A-8-196016

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is a novel structure capable of exhibiting a stable holding force for various types of wire harnesses having different diameters. It is providing the electrical component provided with the harness fixing piece.

  A first aspect of the present invention is an electrical component including a component main body having an insertion port for a wire harness, and a harness fixing piece integrally projecting outward from the insertion port of the component main body. The harness fixing piece is fixed to the base part integrally formed with the component main body and the mounting surface of the wire harness in the base part, and is softer and higher in viscosity than the base part. It is characterized by including the surface sheet part comprised with the elastic elastomer material.

  According to the electrical component including the harness fixing piece structured according to this aspect, the harness fixing piece to which the wire harness is fixed includes the base portion integrally formed with the component main body, and the harness mounting surface of the base portion And a surface sheet portion fixed to the surface. Further, the top sheet portion is made of an elastomer material that is softer and has higher viscoelasticity than the base portion. Therefore, when the wire harness is placed along the harness fixing piece and bound and fixed with vinyl tape or a binding band, the contact area between the wire harness and the surface sheet portion can be increased by the elasticity of the surface sheet portion. In addition, a high frictional resistance can be generated between the wire harness and the surface sheet portion of the harness fixing piece by the viscoelasticity of the surface sheet portion.

  Thereby, even when a wire harness is comparatively large diameter, the displacement with respect to the harness fixing piece of a wire harness can be suppressed, and a wire harness can be stably hold | maintained with respect to a harness fixing piece. In addition, when the wire harness has a relatively small diameter, the high-viscosity of the surface sheet portion of the harness fixing piece prevents sliding displacement of the wire harness on the harness fixing piece. It can be held stably.

  In particular, even when the insulation coating of the wires constituting the wire harness is formed of a material having a low frictional resistance such as halogen-free, the wire harness of the material due to the high viscoelasticity of the surface sheet portion of the harness fixing piece It is possible to reliably prevent slippage. Therefore, according to the electrical component including the harness fixing piece of the present invention, the harness fixing piece can exhibit a stable holding force with respect to various wire harnesses.

  According to a second aspect of the present invention, in the first aspect, the top sheet portion is integrally formed with the base portion of the harness fixing piece.

  According to this aspect, the base part and the surface sheet part of the harness fixing piece are integrally formed. Specifically, after the base part of the component main body and the harness fixing piece is injection-molded, a part of the mold is replaced, and the surface sheet part is further injection-molded on the surface of the base part. Can be integrally molded. Therefore, compared with the case where the surface sheet portion is separately formed and bonded to the base portion via an adhesive or the like, it can be manufactured with higher work efficiency.

  A third aspect of the present invention is the one described in the first or second aspect, wherein the harness fixing piece extends in an arc cross-sectional shape.

  According to this aspect, since the harness fixing piece extends in an arc cross-sectional shape, the surface sheet portion of the harness fixing piece can be made to extend along a wider range with respect to the outer peripheral surface of the wire harness, and the surface sheet The friction resistance between the portion and the surface of the wire harness can be expressed more advantageously, and the wire harness can be more stably held by the harness fixing piece.

  According to the present invention, the harness fixing piece includes the base portion and the surface sheet portion fixed to the harness mounting surface of the base portion. Further, the top sheet portion is made of an elastomer material that is softer and has higher viscoelasticity than the base portion. Therefore, when the wire harness is placed along the harness fixing piece and bound and fixed, the contact area between the wire harness and the surface sheet portion can be increased by the elasticity of the surface sheet portion, and the wire harness and the harness fixing piece. High frictional resistance can be generated between the top sheet portion and the top sheet portion. Thereby, even when a wire harness is comparatively large diameter, the displacement with respect to the harness fixing piece of a wire harness can be suppressed, and a wire harness can be stably hold | maintained with respect to a harness fixing piece. In addition, when the wire harness has a relatively small diameter, the high-viscosity of the surface sheet portion of the harness fixing piece prevents sliding displacement of the wire harness on the harness fixing piece. It can be held stably. In particular, even if the insulation coating of the wires that make up the wire harness is made of a material that has low frictional resistance, such as halogen-free, the high-viscosity of the surface sheet of the harness fixing piece ensures that the wire harness of such material will slip. Can be prevented. Therefore, a stable holding force can be exhibited for various wire harnesses.

The perspective view which shows the protector and binding band as an electrical component provided with the harness fixing piece of one Embodiment of this invention. The perspective view which shows the state which bound and fixed using the binding band while accommodating and holding a wire harness in the protector of this embodiment. The front enlarged view of FIG. It is a front enlarged view in case a wire harness is comparatively small diameter, Comprising: The figure corresponded in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1-3, the protector 10 as an electrical component provided with the harness fixing piece as one embodiment of the present invention is shown. As shown in FIG. 1, the protector 10 is a protector that is a component main body having an insertion port 12 through which a wire harness 48 to be described later is inserted at the front end portion in the longitudinal direction while the front view is substantially U-shaped and extends in a bowl shape. The main body 14 and a lid 18 that covers the upper opening 16 of the protector main body 14 are included, and are integrally formed of, for example, a synthetic resin such as polypropylene (PP) by injection molding or the like. In the following description, “upper” refers to the upper side in FIG. 3, “lower” refers to the lower side in FIG. 3, and “front” refers to the upper side perpendicular to the paper surface in FIG. Let's say vertical down.

  The protector body 14 includes a bottom wall 20 and a pair of side walls 22a and 22b rising from both sides of the bottom wall 20 and extends in a bowl shape. Further, the insertion hole 12 of the protector body 14 is provided with a harness fixing piece 24 having a substantially arc cross-sectional shape that integrally extends outward from the side wall 22a and the bottom wall 20 on the back side. 48 can be fixed.

  As shown in FIG. 1, the harness fixing piece 24 includes a base portion 26 formed integrally with the protector body 14 and an inner surface 28 of the base portion 26 on which the wire harness 48 is placed. And a top sheet portion 30 fixed over substantially the entire surface. The top sheet portion 30 is an elastomer material that is softer and more viscoelastic than the base portion 26, such as TPO (olefin-based thermoplastic elastomer), SI (silicone rubber), NBR (nitrile rubber), or IIR (butyl rubber). ) Etc. For example, the surface sheet portion 30 is formed by, for example, injection-molding the protector body 14 and the base portion 26 of the harness fixing piece 24, and then replacing a part of the molding die to form the base portion 26 of the harness fixing piece 24. On the other hand, the top sheet portion 30 is integrally molded by a two-color molding method in which the top sheet portion 30 is injection molded on the inner surface 28 of the base portion 26.

  Further, as shown in FIG. 1, the harness fixing piece 24 has a binding band holding portion that protrudes outward in a rectangular cross-sectional shape on the outer surface of the wall portion 32 connected to the side wall 22 a of the protector body 14. On the other hand, a band insertion hole 36 that opens in the vertical direction is provided through the binding band holding portion 34. The upper end surface 38 of the binding band holding portion 34 is positioned below the upper end surface 40 of the wall portion 32 in the harness fixing piece 24.

  As shown in FIG. 1, a rectangular engagement hole 42 is provided in the side wall 22b on the front side of the protector body 14 at both ends in the longitudinal direction on the upper opening 16 side. A lid 18 is hinged to the upper end of the rear side wall 22a. An engagement protrusion 44 that protrudes inward is provided on the inner surface of the lid 18 corresponding to the engagement hole 42 when the cover is covered, and an engagement claw is provided at the tip of the engagement protrusion 44. 46 protrudes.

  As shown in FIG. 2, the wire harness 48 is inserted into and accommodated in the protector 10 having the above-described structure, and is bound and fixed as follows. Here, the wire harness 48 is configured by bundling a number of electric wires (not shown), and the insulating coating of the electric wires is formed of, for example, a halogen-free flame-retardant crosslinked polyolefin. More specifically, first, the wire harness 48 is inserted and accommodated in the protector main body 14 of the protector 10, and the upper opening 16 of the protector main body 14 is covered with the lid 18. At this time, the engaging claw 46 at the tip of the engaging protrusion 44 projecting from the inner surface of the lid 18 is engaged with the engaging hole 42 provided in the side wall 22b on the front side of the protector body 14. The lid 18 is engaged and fixed to the protector body 14 so as to be covered.

  Next, the wire harness 48 is fixed to the protector 10 using the binding band 50. More specifically, as shown in FIG. 1, the binding band 50 includes a band portion 52 having an elongated flat plate shape having a rectangular cross section, and one end portion in the length direction of the band portion 52 is provided. The head portion 54 is integrally formed. As is well known, the binding band 50 is integrally formed of a synthetic resin material, and the band portion 52 can be bent and deformed. In addition, a large number of serrated locking projections (not shown) are formed side by side in the longitudinal direction of the band portion 52 on one side 56 which is one side in the thickness direction of the band portion 52. Further, an insertion hole 58 is formed in the head portion 54 of the binding band 50, and a locking piece 60 protruding inward is provided inside the insertion hole 58. Then, the band piece 52 of the binding band 50 is bent in a ring shape, and the distal end portion is inserted into the insertion hole 58, whereby the locking piece 60 is locked to the locking protrusion of the band portion 52. ing. In addition, since the locking projection of the band portion 52 has a sawtooth shape, the locking action of the locking piece 60 with respect to the locking projection functions only in the direction of pulling out the band portion 52 from the insertion hole 58. Therefore, as shown in FIG. 2, the wire harness 48 can be fastened and fixed to the harness fixing piece 24 of the protector 10 by the band portion 52 so as not to be released. The fixed binding band 50 is cut off at the tip of the band portion 52 so as to prevent contact with other members.

  According to the protector 10 having such a structure, the surface sheet portion 30 is fixed over substantially the entire inner surface 28 of the base portion 26 constituting the harness fixing piece 24 to which the wire harness 48 is bound and fixed. . Since the top sheet portion 30 is made of an elastomer material that is softer and has higher viscoelasticity than the base portion 26, when the wire harness 48 is bound and fixed to the harness fixing piece 24, The contact area between the wire harness 48 and the top sheet portion 30 can be increased by elasticity, and a high frictional resistance can be generated between the wire harness 48 and the top sheet portion 30 by the viscoelasticity of the top sheet portion 30. It can be done. Therefore, as shown in FIG. 3, even when the wire harness 48 has a relatively large diameter, the displacement of the wire harness 48 relative to the harness fixing piece 24 can be suppressed. It can be stably held with respect to the harness fixing piece 24. On the other hand, as shown in FIG. 4, when the wire harness 48 has a relatively small diameter, a harness that is easily caused to slip by being formed of a synthetic resin such as polypropylene (PP) as in the prior art. Compared with the case where the wire harness 48 is placed on the inner surface 28 of the base portion 26 of the fixed piece 24, the wire harness 48 slides on the harness fixed piece 24 due to the high viscoelasticity of the surface sheet portion 30 of the harness fixed piece 24. Since the displacement is prevented, the wire harness 48 can be stably held with respect to the harness fixing piece 24. In addition, in this embodiment, the insulation coating of the electric wires constituting the wire harness 48 is formed of a material having a low frictional resistance such as a halogen-free flame-retardant crosslinked polyolefin. Even in such a case, due to the high viscoelasticity of the surface sheet portion 30 of the harness fixing piece 24, it is possible to reliably prevent the sliding displacement of the wire harness 48 made of such electric wires. . Therefore, the harness fixing piece 24 can exhibit a stable holding force with respect to various wire harnesses 48.

  In addition, since the base portion 26 and the surface sheet portion 30 of the harness fixing piece 24 are integrally molded, for example, the surface sheet portion 30 is separately formed and bonded to the base portion 26 via an adhesive or the like. Compared to the above, it is possible to manufacture with high work efficiency. Further, since the harness fixing piece 24 extends in an arc cross-sectional shape, for example, as shown in FIG. 3, the surface sheet portion 30 of the harness fixing piece 24 is wider than the outer peripheral surface of the wire harness 48. In addition to being able to make contact in a range, the friction resistance of the surface sheet portion 30 with respect to the outer peripheral surface of the wire harness 48 can be expressed more advantageously, and more stable holding of the wire harness 48 by the harness fixing piece 24 can be realized. is there.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited at all by the specific description in this embodiment. For example, in the above embodiment, the protector 10 has been described as an example of the electrical component including the harness fixing piece 24, but the present invention is not limited to this. For example, the present invention can be similarly applied to other electrical components such as an electrical junction box having a harness fixing piece 24 and a connector holder. Moreover, in the said embodiment, although the insulation coating of the electric wire which comprises the wire harness 48 was formed, for example with halogen-free flame-retardant crosslinked polyolefin, the insulation coating formed with general ethylene resin and styrene resin The effect of the present invention can be exhibited to the same extent or more with respect to a wire harness composed of an electric wire having the same. Further, the protector body 14 and the base portion 26 of the harness fixing piece 24 are made of polypropylene (PP), but may be made of a synthetic resin such as polyamide (PA). In addition, in the said embodiment, although the surface sheet part 30 was integrally formed with the base part 26 of the harness fixing piece 24 by the 2 color molding method, you may adhere | attach with the adhesive agent etc. Moreover, in the said embodiment, although the harness fixing piece 24 extended in circular arc cross-sectional shape, if cross-sectional shape, such as L-shaped cross-sectional shape and flat plate cross-sectional shape, can be employ | adopted if the wire harness 48 can be bound and hold | maintained.

10: protector (electrical component with harness fixing piece), 12: insertion port, 14: protector main body (component main body), 24: harness fixing piece, 26: base part, 30: surface sheet part, 48: wire harness

Claims (3)

A component body having a wire harness insertion port;
An electrical component comprising a harness fixing piece integrally projecting outward from the insertion port of the component body,
The harness fixing piece is integrally formed with the component body, and a base part, and an elastomer that is fixed to the mounting surface of the wire harness in the base part and is softer and has higher viscoelasticity than the base part. An electrical component comprising a harness fixing piece, comprising a surface sheet portion made of a material.   The electrical component including the harness fixing piece according to claim 1, wherein the top sheet portion is integrally formed with the base portion of the harness fixing piece.   The electrical component provided with the harness fixing piece according to claim 1, wherein the harness fixing piece extends in an arc cross-sectional shape.

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