Wire harness, and grommet

Abstract

To provide a wire harness which can secure water cut-off performance while reducing the number of components.SOLUTION: A wire harness 10 comprises: a plurality of electric wires 20; a grommet 30 having a plurality of cylindrical parts 32 into which each of the plurality of electric wires 20 is penetrated; and a binding member 40 which hinders passage of liquid between the electric wires 20 and the cylindrical parts 32 by being provided to tighten an outer periphery of the cylindrical parts 32. The binding member 40 is provided to tighten the plurality of cylindrical parts 32 together, and the plurality of cylindrical parts 32 are made into contact surfaces 32a of which the parts facing each other contact by surfaces without a gap in a state of being tightened to the binding member 40 together.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a wire harness and a grommet. [Background technology]

[0002] Conventionally, there has been a wire harness that includes a plurality of electric wires and a grommet (see, for example, Patent Document 1). This grommet has a fitting portion that can be fitted into a fixing hole provided in a panel or the like, and a tubular portion through which the plurality of electric wires pass. In addition, a portion of the extending direction of the plurality of electric wires is sandwiched between a foam sheet and gathered into a single cylindrical shape, thereby forming the cylindrical portion together with the foam sheet. The cylindrical portion is then disposed within a tubular portion whose inner diameter is smaller than the outer diameter of the cylindrical portion. This prevents liquid from passing between the electric wires and the tubular portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-165061 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-described wire harness, the workability of inserting the cylindrical portion into the tubular portion having a small inner diameter is poor. Therefore, for example, a wire harness configured such that a grommet is provided with a plurality of tubular portions through which a plurality of electric wires are respectively passed, and the outer periphery of the tubular portions is fastened with a fastening member such as a cable tie, can be considered. In such a wire harness, the outer periphery of the tubular portions is fastened with a fastening member after the electric wires are passed through the tubular portions, thereby facilitating the wire passing work and ensuring watertightness.

[0005] However, in such a wire harness, if a bundling member is provided for each tubular portion, the number of parts increases. Also, if a single bundling member is used to fasten multiple tubular portions together, large gaps may occur between the tubular portions, reducing adhesion at those locations and potentially reducing watertightness.

[0006] An object of the present disclosure is to provide a wire harness and a grommet that can ensure watertightness while reducing the number of parts. [Means for solving the problem]

[0007] The wire harness of the present disclosure is a wire harness comprising a plurality of electric wires, a grommet having a plurality of tubular portions through which each of the plurality of electric wires passes, and a binding member that is arranged to tighten the outer periphery of the tubular portions to prevent the passage of liquid between the electric wires and the tubular portions, wherein the binding member is arranged to tighten the plurality of tubular portions together, and when the plurality of tubular portions are tightened together by the binding member, opposing portions of the tubular portions form contact surfaces that make surface contact with each other without any gaps. [Effects of the Invention]

[0008] According to the wire harness of the present disclosure, it is possible to ensure watertightness while reducing the number of parts. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a partial perspective view of a wire harness according to an embodiment. [Figure 2] FIG. 2 is a partially exploded perspective view of the wire harness according to the embodiment. [Figure 3] FIG. 3 is a partial cross-sectional view of the wire harness according to the embodiment. [Figure 4] FIG. 4 is a partial perspective view of a wire harness according to another embodiment. [Figure 5] FIG. 5 is a partially exploded perspective view of a wire harness according to another embodiment. [Figure 6] FIG. 6 is a partial cross-sectional view of a wire harness according to another embodiment. [Figure 7] FIG. 7 is a partial perspective view of a wire harness according to another embodiment. [Figure 8] FIG. 8 is a partially exploded perspective view of a wire harness according to another embodiment. [Figure 9] FIG. 9 is a partial cross-sectional view of a wire harness according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. The wire harness of the present disclosure includes: [1] A wire harness comprising a plurality of electric wires, a grommet having a plurality of tubular portions through which each of the plurality of electric wires passes, and a binding member that is arranged to fasten the outer periphery of the tubular portions to prevent the passage of liquid between the electric wires and the tubular portions, wherein the binding member is arranged to fasten the plurality of tubular portions together, and when the plurality of tubular portions are fastened together by the binding member, opposing portions of the tubular portions form contact surfaces that are in surface contact with each other without any gaps.

[0011] With this configuration, when the multiple tubular parts are fastened together by the bundling member, the opposing portions of the tubular parts are in surface contact with each other without any gaps, so that the gaps between the tubular parts can be reduced while using a single bundling member, thereby ensuring the watertightness of each of the multiple tubular parts while reducing the number of parts.

[0012] [2] In the above [1], the plurality of cylindrical portions may be formed in the same shape. According to this configuration, the plurality of cylindrical portions are formed to have the same shape, so that the force can be applied uniformly by the binding member.

[0013] [3] In the above [2], the plurality of cylindrical portions may be formed into a shape that is equally divided radially from the center of a circle when viewed in the extending direction of the plurality of cylindrical portions. According to this configuration, the multiple tubular portions are formed in a shape that is equally divided radially from the center of a circle when viewed in the direction of extension of the multiple tubular portions, making design easier and allowing force to be applied uniformly by the binding member.

[0014] [4] In any one of the above [1] to [3], the tubular portion may have a pair of engaging steps that can engage with both ends of the binding member in the width direction. According to this configuration, the cylindrical portion has a pair of engagement steps that can engage with both ends of the binding member in the width direction, thereby preventing the binding member from slipping off from the cylindrical portion.

[0015] [5] In any one of the above items [1] to [4], the binding member may be made of a resin material. According to this configuration, the binding member is made of a resin material, and therefore can be made lighter and less expensive than, for example, a binding member made of a metal material.

[0016] The grommet of the present disclosure comprises: [6] A grommet having a plurality of tubular portions through which a plurality of electric wires are respectively passed, the plurality of tubular portions being fastened together by a binding member, wherein when the plurality of tubular portions are fastened together by the binding member, the opposing portions of the plurality of tubular portions form contact surfaces in which they make surface contact with each other without any gaps.

[0017] According to this configuration, when the multiple tubular parts are fastened together by the bundling member, the opposing portions of the multiple tubular parts are in surface contact with each other without any gaps, so that the single bundling member can be used to reduce the gaps between the multiple tubular parts, thereby ensuring the watertightness of each of the multiple tubular parts while reducing the number of parts of the wire harness.

[0018] [Details of the embodiments of the present disclosure] Specific examples of the present disclosure will be described below with reference to the drawings. In each drawing, for the convenience of explanation, some components may be exaggerated or simplified. Furthermore, the dimensional proportions of each part may differ from one drawing to another. Furthermore, the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0019] (Overall configuration of the wire harness 10) 1 and 2 includes a plurality of electric wires 20, a grommet 30, and a bundling member 40. The wire harness 10 of this embodiment includes two electric wires 20.

[0020] (Configuration of electric wire 20) As shown in FIG. 3, the electric wire 20 has a core wire 21 and an insulating coating 22 that covers the outer periphery of the core wire 21.

[0021] The core wire 21 is formed of, for example, a twisted wire made by twisting together a plurality of conductive wires, a single-core wire, etc. The core wire 21 is made of, for example, a metal material such as copper or aluminum. The cross section of the core wire 21 in this embodiment is formed to have a perfect circular shape.

[0022] The insulating coating 22 covers the entire outer periphery of the core wire 21. The insulating coating 22 is made of an insulating material such as a synthetic resin containing, as a main component, a polyolefin resin such as cross-linked polyethylene or cross-linked polypropylene.

[0023] (Grommet 30 configuration) The grommet 30 is made of, for example, rubber or elastomer. As shown in Fig. 2, the grommet 30 has a fitting portion 31 that can be fitted into a fixing hole provided in a panel or the like (not shown), and a plurality of tubular portions 32 through which each of the plurality of electric wires 20 passes. The grommet 30 of this embodiment has two tubular portions 32. In addition, the tubular portion 32 has a recess formed in a portion of the extending direction of the tubular portion 32 that does not face the other tubular portion 32, thereby providing a pair of engagement steps 33 that can engage with both ends of the binding member 40 in the width direction.

[0024] (Configuration of binding member 40) The binding member 40 is made of, for example, a resin material. The binding member 40 of this embodiment is a cable tie having a flexible strip-shaped portion 41 and a locking portion 42 that is provided at one end of the strip-shaped portion 41 in the longitudinal direction and locks the strip-shaped portion 41 when it is passed through.

[0025] 1 and 3, the bundling member 40 is provided to fasten the outer periphery of the tubular portion 32, thereby preventing the passage of liquid between the electric wires 20 and the tubular portion 32. The bundling member 40 of this embodiment is provided to fasten a plurality of tubular portions 32 together. Note that FIG. 2 is an exploded perspective view of the wire harness 10 before assembly, and schematically illustrates the bundling member 40 in a state where the belt-like portion 41 is passed through the lock portion 42.

[0026] 3, the multiple tubular portions 32 of the grommet 30 have contact surfaces 32a where opposing portions are in surface contact with each other without gaps when the grommet 30 is fastened together with the binding member 40. In other words, the multiple tubular portions 32 have contact surfaces 32a where opposing portions are in surface contact with each other without gaps.

[0027] Specifically, the multiple cylindrical portions 32 are formed to have the same shape. When viewed in the direction in which the multiple cylindrical portions 32 extend (see FIG. 3), the multiple cylindrical portions 32 are formed to have shapes equally divided radially from the center of a circle. In this embodiment, when viewed in the direction in which the two cylindrical portions 32 extend, the two cylindrical portions 32 are formed to have shapes equally divided by grooves 34 extending in two directions at 180° intervals from the center of the circle. That is, in this embodiment, the two cylindrical portions 32 are formed to have a substantially semicircular shape when viewed in the direction in which the cylindrical portions 32 extend. As a result, when the two cylindrical portions 32 are fastened together to the binding member 40 (see FIG. 3), the flat surfaces that face each other form contact surfaces 32a that are in surface contact with no gaps. As shown in FIG. 2, the multiple cylindrical portions 32 are formed so that the contact surfaces 32a are slightly spaced apart by the grooves 34 provided between them when they are not fastened to the binding member 40 and are in an unloaded state.

[0028] (Operation of the embodiment) Next, the operation of the wire harness 10 configured as above will be described. Because the grommet 30 has multiple tubular portions 32 through which each of the multiple electric wires 20 passes, each of the multiple electric wires 20 can be easily inserted into the multiple tubular portions 32 without being fastened by the binding member 40. Note that in a configuration in which multiple insertion holes are formed in a single tubular portion 32, when a first electric wire 20 is inserted into an insertion hole, the other insertion holes may become smaller or be difficult to expand, which may worsen the ease of inserting the second electric wire 20 into the insertion hole. In contrast, because the grommet 30 of the present embodiment has multiple independent tubular portions 32, inserting the first electric wire 20 into the tubular portion 32 does not worsen the ease of inserting the second electric wire 20 into the tubular portion 32.

[0029] The multiple tubular portions 32 are then fastened together to the binding member 40. At this time, the opposing contact surfaces 32a of the multiple tubular portions 32 are in surface contact with each other, thereby preventing gaps from occurring inside the binding member 40. This prevents escape routes for flesh from occurring between the tubular portions 32, and prevents a decrease in adhesion inside the binding member 40. Therefore, liquid is prevented from passing between the electric wires 20 and the tubular portions 32.

[0030] (Effects of the embodiment) Next, the effects of the above embodiment will be described below. (1) When the multiple tubular portions 32 are fastened together to the binding member 40, the opposing portions of the multiple tubular portions 32 form contact surfaces 32a that are in surface contact with each other without any gaps. This allows the single binding member 40 to have small gaps between the multiple tubular portions 32. This reduces the number of parts while ensuring watertightness in each of the multiple tubular portions 32. The reduction in the number of parts of the binding member 40 contributes to a reduction in the number of assembly steps and contributes to a reduction in the size of the wire harness 10. In particular, when the binding member 40 is a cable tie as in the present embodiment, the assembly process is facilitated because the steps of passing the belt-like portion 41 through the locking portion 42 and cutting off the excess belt-like portion 41 are performed only once.

[0031] (2) Because the multiple tubular portions 32 are formed in the same shape, a uniform force can be applied by the binding member 40. Therefore, the water-stopping properties of each of the multiple tubular portions 32 can be ensured uniformly.

[0032] (3) The multiple tubular portions 32 are formed in a shape that is equally divided radially from the center of a circle when viewed in the extension direction of the multiple tubular portions 32, making design easier and allowing the binding member 40 to apply force uniformly.

[0033] (4) The tubular portion 32 has a pair of engagement steps 33 that can engage with both widthwise ends of the binding member 40, thereby preventing the binding member 40 from shifting relative to the tubular portion 32. This prevents, for example, the binding member 40 from falling off the tubular portion 32.

[0034] (5) The binding member 40 is made of a resin material, and therefore can be made lighter and less expensive than, for example, a binding member made of a metal material. (Example of change) The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0035] In the above embodiment, the wire harness 10 includes two electric wires 20, but is not limited to this and may include three or more electric wires 20. In this case, the number of tubular portions 32 needs to be changed depending on the number of electric wires 20.

[0036] For example, the wiring harness 10 may be modified as shown in Figures 4 to 6. The wiring harness 10 of this example includes three electric wires 20, a grommet 50, and a bundling member 40. The grommet 50 in this example has a fitting portion 51 that can be fitted into a fixing hole provided in a panel or the like (not shown), and three tubular portions 52 through which the three electric wires 20 are respectively passed. As shown in Fig. 5, the tubular portion 52 has a pair of engagement steps 53 that can be engaged with both ends of the binding member 40 in the width direction.

[0037] 6, the three tubular portions 52 have contact surfaces 52a where opposing portions are in surface contact with each other without any gaps when fastened together by the binding member 40. In other words, the three tubular portions 52 have contact surfaces 52a where opposing portions are in surface contact with each other without any gaps.

[0038] Specifically, the three cylindrical portions 52 are formed to have the same shape. When viewed in the direction in which the three cylindrical portions 52 extend (see FIG. 6), the three cylindrical portions 52 are formed to have a shape equally divided radially from the center of a circle. In other words, when viewed in the direction in which the three cylindrical portions 52 extend, the three cylindrical portions 52 are formed to have a shape equally divided by grooves 54 extending in three directions at 120° intervals from the center of the circle. As a result, when the three cylindrical portions 52 are fastened together to the binding member 40 (see FIG. 6), the flat surfaces of the opposing portions form contact surfaces 52a that are in surface contact with each other without any gaps. As shown in FIG. 5, the three cylindrical portions 52 are formed so that the contact surfaces 52a are slightly spaced apart by the grooves 54 provided between them when they are not fastened to the binding member 40 and are in an unloaded state. This configuration can also achieve the same effects as the above-described embodiment.

[0039] 7 to 9. The wire harness 10 of this example includes four electric wires 20, a grommet 60, and a bundling member 40. The grommet 60 in this example has a fitting portion 61 that can be fitted into a fixing hole provided in a panel or the like (not shown), and four tubular portions 62 through which each of the four electric wires 20 passes. As shown in Fig. 8, the tubular portion 62 has a pair of engagement steps 63 that can be engaged with both ends of the binding member 40 in the width direction.

[0040] 9, the four tubular portions 62 have contact surfaces 62a that allow surface contact without gaps between opposing portions of the four tubular portions 62 when the four tubular portions 62 are fastened together to the binding member 40. In other words, the four tubular portions 62 have contact surfaces 62a that allow surface contact without gaps between opposing portions of the four tubular portions 62.

[0041] Specifically, the four cylindrical portions 62 are formed to have the same shape. When viewed in the direction in which the four cylindrical portions 62 extend (see FIG. 9), the four cylindrical portions 62 are formed to have a shape equally divided radially from the center of a circle. In other words, when viewed in the direction in which the four cylindrical portions 62 extend, the four cylindrical portions 62 are formed to have a shape equally divided by grooves 64 extending in four directions at 90° intervals from the center of the circle. As a result, when the four cylindrical portions 62 are fastened together to the binding member 40 (see FIG. 9), the flat surfaces of the opposing portions form contact surfaces 62a that are in surface contact with each other without any gaps. As shown in FIG. 8, the four cylindrical portions 62 are formed so that the contact surfaces 62a are slightly spaced apart by the grooves 64 provided between them when they are not fastened to the binding member 40 and are in an unloaded state. This configuration can also achieve the same effects as the above-described embodiment.

[0042] In the above embodiment, the multiple tubular portions 32 are formed to have the same shape, but they may be formed to have different shapes as long as the opposing portions form contact surfaces 32a that are in surface contact with each other without any gaps when fastened together by the binding member 40.

[0043] In the above embodiment, the multiple cylindrical portions 32 are formed in a shape that is equally divided radially from the center of a circle when viewed in the extension direction of the multiple cylindrical portions 32, but this is not limited to this and the multiple cylindrical portions 32 may be formed in other shapes.

[0044] In the above embodiment, the tubular portion 32 of the grommet 30 has a pair of engagement steps 33 that can engage with both ends of the binding member 40 in the width direction, but this is not limited to this, and the grommet 30 may be configured not to have a pair of engagement steps 33.

[0045] In the above embodiment, the binding member 40 is made of a resin material, but is not limited to this and may be made of other materials such as metal. Also, the binding member 40 may be replaced with an adhesive tape. [Explanation of symbols]

[0046] 10 Wire harness 20 Electric wire 21 Core Wire 22 Insulation coating 30 Grommets 31 Fitting part 32 Cylindrical part 32a Contact surface 33 Engagement step 34 Groove 40 Binding member 41 Belt 42 Lock Section 50 grommets 51 Fitting part 52 Cylindrical part 52a Contact surface 53 Engagement step 54 Groove 60 Grommets 61 Fitting part 62 Cylindrical part 62a Contact surface 63 Engagement step 64 Groove

Claims

1. A plurality of wires; a grommet having a plurality of cylindrical portions through which the plurality of electric wires are respectively passed; a binding member that is provided to fasten the outer periphery of the cylindrical portion and thereby prevents the passage of liquid between the electric wire and the cylindrical portion; A wire harness comprising: The binding member is provided to fasten the plurality of tubular portions together, When the plurality of cylindrical portions are fastened together by the binding member, opposing portions of the cylindrical portions form contact surfaces that come into surface contact with each other without any gaps. Wire harness.

2. The plurality of cylindrical portions are formed to have the same shape. The wire harness according to claim 1 .

3. The plurality of cylindrical portions are formed into a shape that is equally divided radially from a center of a circle when viewed in an extending direction of the plurality of cylindrical portions. The wire harness according to claim 2 .

4. The cylindrical portion has a pair of engagement steps that can be engaged with both ends of the binding member in the width direction. The wire harness according to claim 1 .

5. The binding member is made of a resin material. The wire harness according to claim 1 .

6. A grommet having a plurality of cylindrical portions through which a plurality of electric wires are respectively passed, the plurality of cylindrical portions being fastened together by a bundling member, When the plurality of cylindrical portions are fastened together by the binding member, opposing portions of the cylindrical portions form contact surfaces that come into surface contact with each other without any gaps. Grommet.

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