Wire harness and grommet

Abstract

To provide a wire harness and a grommet having an excellent water cut-off property.SOLUTION: A wire harness 1 is partially arranged in a space that is isolated from the outside with a surrounding partition wall. The wire harness includes an electric wire 10, a braided conductor 20 coating the electric wire 10, a grommet 40 having a tubular insertion portion 42 through which the electric wire 10 and the braided conductor 20 are inserted, and a water cut-off sheet 50 disposed between the braided conductor 20 and the inner circumferential surface of the insertion portion 42. In a first tubular section 43 of a body portion 41 of the grommet 40, at least a portion of an inner circumferential surface 43a has a groove 45 that is recessed so as to be located radially outside an inner circumferential surface 44a of a second tubular section 44 of the body portion 41.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a wire harness and a grommet.

Background Art

[0002] Conventionally, in a wire harness for an automobile, when passing an electric wire through an opening that communicates the inside and outside of the vehicle body, a grommet made of an elastic material is used to block the gap between the opening and the electric wire in order to prevent water, foreign matter, etc. from entering the inside of the vehicle body through the opening. Generally, a grommet has a main body portion corresponding to the shape of the mounting opening and a tubular insertion portion through which the electric wire is inserted (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] On the other hand, even at the location where the grommet of the vehicle body is attached, water may be sprayed by high-pressure washing or the like. For this reason, in the above-described conventional grommet, after passing an electric wire through the tubular insertion portion, a binding band or the like is wound around the outer peripheral surface of the insertion portion and tightened. As a result, the inner peripheral surface of the insertion portion is brought into close contact with the electric wire by reducing the diameter of the insertion portion, and intrusion of water or the like through the gap between the electric wire and the insertion portion is suppressed. However, if a water pressure of a certain level or more is applied to the grommet for a predetermined time, there is a certain risk that water or the like will intrude through the gap between the electric wire and the insertion portion. In addition, when the grommet is attached to, for example, a floor panel, if the underfloor of the vehicle is flooded, there is a risk that water or the like will intrude through the gap between the electric wire and the insertion portion. Therefore, even in such a case, it is preferably configured so that water or the like does not enter the inside of the vehicle body.

[0005] This invention has been made in view of the above-described circumstances, and its purpose is to provide a wire harness and grommet with excellent watertightness. [Means for solving the problem]

[0006] To achieve the aforementioned objectives, the wire harness according to the present invention has the following features. A wire harness in which a portion is routed within a space isolated from the outside by surrounding partitions, Power lines and, A braided conductor covering the aforementioned electric wire, A grommet having a cylindrical insertion portion through which the electric wire and the braided conductor are inserted, The system includes a watertight sheet sandwiched between the inner circumferential surface of the insertion portion and the braided conductor, The grommet is, It will be attached to the partition wall so as to close the opening provided in the partition wall. The main body has a recess on its outer surface that is recessed radially inward so as to fit the opening end of the aforementioned opening, The main body is, A first cylindrical portion located on the insertion side of the recessed portion, It has a second cylindrical portion located on the opposite side of the insertion portion from the recessed portion, The first cylindrical portion is, At least a portion of the inner circumferential surface has a groove that is recessed so as to be located radially outward from the inner circumferential surface of the second cylindrical portion, The internal space of the groove located radially outward from the inner circumferential surface of the second cylindrical portion is defined by the bottom surface of the tapered groove, which is the inner circumferential surface of the first cylindrical portion having a tapered shape that increases in diameter from the insertion portion side toward the second cylindrical portion side, and the side surface of the groove extending radially inward toward the radial side of the first cylindrical portion from the end of the bottom surface toward the second cylindrical portion side. , The bottom surface of the groove is provided with a plurality of ribs that protrude radially inward from the first cylindrical portion and extend along the axial direction of the first cylindrical portion, connecting to the side surface of the groove, arranged at intervals in the circumferential direction of the first cylindrical portion. It must be a wire harness.

[0007] Furthermore, in order to achieve the aforementioned objectives, the grommet according to the present invention has the following features. A grommet that will be attached to a partition wall so as to close an opening provided in the partition wall, The insertion point through which the electric wire will be inserted, The main body has a recess on its outer surface that is recessed radially inward so as to fit the edge of the opening, The main body is, A first cylindrical portion located on the insertion side of the recessed portion, It has a second cylindrical portion located on the opposite side of the insertion portion from the recessed portion, The first cylindrical portion is, At least a portion of the inner circumferential surface has a groove that is recessed so as to be located radially outward from the inner circumferential surface of the second cylindrical portion, The internal space of the groove located radially outward from the inner circumferential surface of the second cylindrical portion is defined by the bottom surface of the tapered groove, which is the inner circumferential surface of the first cylindrical portion having a tapered shape that increases in diameter from the insertion portion side toward the second cylindrical portion side, and the side surface of the groove extending radially inward toward the radial side of the first cylindrical portion from the end of the bottom surface toward the second cylindrical portion side. , The bottom surface of the groove is provided with a plurality of ribs that protrude radially inward from the first cylindrical portion and extend along the axial direction of the first cylindrical portion, connecting to the side surface of the groove, arranged at intervals in the circumferential direction of the first cylindrical portion. It must be a grommet. [Effects of the Invention]

[0008] The wire harness and grommet according to the present invention will be described below. The wire harness includes a water-stop sheet sandwiched between the inner peripheral surface of the insertion portion of the grommet and the braided conductor. Thereby, the wire harness is excellent in water-stopping property at the insertion portion of the grommet. In addition, the grommet is provided with a recess on the outer peripheral surface of the main body portion into which the open end of the partition wall fits. Thereby, the grommet is located outside the space where the insertion portion and the first cylindrical portion of the main body portion are isolated, and the second cylindrical portion is located in the space isolated from the outside. And the first cylindrical portion has a groove portion that is recessed so that at least a part of the inner peripheral surface is located radially outside the inner peripheral surface of the second cylindrical portion. Thereby, even if water or the like intrudes through between the water-stop sheet and the inner peripheral surface of the insertion portion, the intruded water or the like will flow into the groove portion and accumulate in the groove portion. The water or the like accumulated in the groove portion will evaporate due to the peripheral temperature outside the isolated space. That is, the wire harness and grommet of this configuration are excellent in water-stopping property compared to conventional wire harnesses and grommets.

[0009] The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading through the embodiments for carrying out the invention described below (hereinafter referred to as "embodiments") with reference to the attached drawings.

Brief Explanation of Drawings

[0010] [Figure 1] FIG. 1 is a schematic diagram of the wiring structure of the wire harness according to the embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the wire harness according to the embodiment of the present invention. [Figure 3] FIG. 3 is a perspective view showing each member extending from the insertion portion of the grommet with each member constituting the wire harness shown in FIG. 1 exposed. [Figure 4] FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2. [Figure 5] FIG. 5 is an enlarged view of part B of FIG. 4. [Figure 6]FIG. 6 is a perspective view of a grommet according to an embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view taken along the line C-C of FIG. 6. [Figure 8] FIG. 8 is an enlarged perspective view of part D of FIG. 7. [Figure 9] FIG. 9 is a view corresponding to FIG. 4 when a plurality of electric wires are inserted through the grommet.

MODE FOR CARRYING OUT THE INVENTION

[0011] <Embodiment> Hereinafter, the wire harness 1 according to the embodiment of the present invention will be described with reference to the drawings. The wire harness 1 is typically used by inserting a sheathless electric wire 30 through an opening (not shown) formed in a panel P (in this example, a floor panel) that partitions the inside and outside of the vehicle body of the automobile V, and closing the gap between the opening of the panel P and the sheathless electric wire 30 with a grommet 40. That is, in this example, the wiring structure 100 of the wire harness 1 is such that the wire harness 1 is used to connect the inverter IV outside the vehicle compartment R2 and the battery BT inside the vehicle compartment R1. The vehicle compartment R1 corresponds to the "space isolated from the outside" of the present invention, and the panel P corresponds to the "partition wall" of the present invention.

[0012] As shown in FIGS. 3 to 5, the wire harness 1 includes a sheathless electric wire 30 composed of an electric wire 10 and a braided conductor 20 covering the electric wire 10, a grommet 40 through which the sheathless electric wire 30 is inserted, a water stop sheet 50 sandwiched between the inner peripheral surface of the insertion portion 42 of the grommet 40 and the sheathless electric wire 30 (the braided conductor 20 thereof), a fixture 60 (such as a tie band) attached to the insertion portion 42 so as to reduce the diameter of the insertion portion 42, and an exterior member 70 (such as a corrugated tube) provided on a portion of the sheathless electric wire 30 other than the portion inserted through the grommet 40. Hereinafter, the configurations of each component constituting the wire harness 1 will be described in order.

[0013] First, let's describe the sheathless electric wire 30. In this example, the electric wire 10 that makes up the sheathless electric wire 30 consists of a round rod-shaped conductor 11 and a cylindrical resin covering 12 that covers the conductor 11, as shown in Figures 3 to 5. The braided conductor 20 that makes up the sheathless electric wire 30 is arranged cylindrically around the outer circumference of the cylindrical covering 12 so as to surround the covering 12. The conductor 11 and the braided conductor 20 are typically made of copper or a copper alloy. The sheathless electric wire 30 has a structure in which there is no sheath to cover the braided conductor 20 (sheathless). By omitting the sheath in this way, the manufacturing cost can be reduced compared to the configuration in which a sheath is provided.

[0014] Next, the grommet 40 will be described. As shown in Figures 6 and 7, the grommet 40 consists of a main body 41 with a recessed portion 47 on its outer surface into which the opening end of the opening in the panel P fits, and a cylindrical insertion portion 42 through which the sheathless electric wire 30 is inserted. The recessed portion 47, in particular as shown in Figure 7, is an annular recess that is recessed radially inward and provided on the outer surface of the main body 41 over the entire circumference in the circumferential direction.

[0015] The main body portion 41 of the grommet 40 consists of a first cylindrical portion 43 located on the insertion portion 42 side (left side of the paper) of the recessed portion 47, and a second cylindrical portion 44 located on the opposite side of the insertion portion 42 (right side of the paper) of the recessed portion 47. In other words, the grommet 40 is composed of the insertion portion 42, the first cylindrical portion 43, and the second cylindrical portion 44 in that order from left to right on the paper. Therefore, when the open end of the panel P is fitted into the recessed portion 47 (i.e., the grommet 40 is attached to the panel P so as to close the opening of the panel P), the insertion portion 42 and the first cylindrical portion 43 are located outside the vehicle R2 (for example, inside the engine room), and the second cylindrical portion 44 is located inside the vehicle R1.

[0016] The first cylindrical portion 43 has a larger diameter than the insertion portion 42 and has a tapered shape in which the diameter increases from the insertion portion 42 side toward the second cylindrical portion 44 side. The inner circumferential surface 43a of the first cylindrical portion 43 is provided with a groove 45 that is recessed so as to be located radially outward from the inner circumferential surface 44a of the second cylindrical portion 44. The groove 45 is provided on the inner circumferential surface 43a over the entire circumference in the circumferential direction. In the axial direction of the grommet 40, of the inner groove walls 45a and 45b that face each other, the inner groove wall 45a on the second cylindrical portion 44 side (right side of the paper) also serves as the end face of the second cylindrical portion 44 on the insertion portion 42 side (right side of the paper) (see Figures 7-8).

[0017] The grommet 40 has a plurality of ribs 46 that project radially inward from the bottom surface of the groove 45 (i.e., the inner circumferential surface 43a of the first cylindrical portion 43). In other words, the ribs 46 extend axially from the first cylindrical portion 43 so as to connect the inner walls 45a and 45b of the groove. The projecting end faces 46a of the ribs 46 are located radially outward from the inner circumferential surface 44a of the second cylindrical portion 44. The plurality of ribs 46 define a plurality of spaces S in the groove 45 by adjacent pairs of ribs 46.

[0018] Next, the waterproofing sheet 50 will be described. The waterproofing sheet 50 is interposed between the inner surface of the insertion portion 42 of the grommet 40 and the outer surface of the sheathless electric wire 30 (i.e., the braided conductor 20), and functions to seal the annular gap between the inner surface of the insertion portion 42 and the outer surface of the sheathless electric wire 30 all around, thereby preventing water from entering.

[0019] The waterproofing sheet 50 has a rectangular shape when spread out on a flat surface (not shown). The waterproofing sheet 50 has a two-layer structure in which a base layer 51 and a sealing compound layer 52 are laminated (see Figure 5). The base layer 51 is made of a mesh material that is made up of fine wires in a mesh-like structure made of polyester and is highly flexible. That is, the base layer 51 has a large number of pores that communicate in the thickness direction.

[0020] The sealing compound layer 52 is made of a rubber material that includes, for example, butyl rubber which has excellent weather resistance (especially cold resistance) and self-fusing properties (adhesion), and is easily deformable by the application of external force. The sealing compound layer 52 is laminated on the base layer 51, for example, by applying a compound for the sealing compound layer 52 in layers on the base layer 51.

[0021] The sealing compound layer 52 is interposed in a cylindrical shape between the inner circumferential surface of the insertion portion 42 and the outer circumferential surface of the sheathless electric wire 30 (i.e., the braided conductor 20), such that the base material layer 51 is located radially outward from the sealing compound layer 52 (see Figure 5).

[0022] Next, the fastener 60 will be described. The fastener 60 is a component that is wrapped around the outer circumferential surface of the insertion portion 42 of the grommet 40 and tightened to reduce the diameter of the insertion portion 42. In this example, a cable tie is used as the fastener 60. However, as long as it is a component that performs the function of wrapping around the outer circumferential surface of the insertion portion 42 of the grommet 40 and tightening to reduce the diameter of the insertion portion 42, a component other than a cable tie may be used as the fastener 60.

[0023] Next, the outer covering member 70 will be described. The outer covering member 70 is made of, for example, a tubular synthetic resin and has a bellows section in which grooves and ridges extending in the circumferential direction of the tube are alternately arranged in the longitudinal direction (up and down direction in Figure 2). As shown in Figure 2, the outer covering member 70 is applied to the portion of the sheathless electric wire 30 that is not inserted into the grommet 40. In this example, a corrugated tube is used as the outer covering member 70. However, as long as the outer covering member 70 is a member that performs the function of protecting the sheathless electric wire 30 inside the outer covering member 70 from interference with the outside, a material other than a corrugated tube may be used as the outer covering member 70. The configuration of each component constituting the wire harness 1 has now been described.

[0024] Next, as shown in Figures 1 and 2, the wiring procedure for attaching the wire harness 1 to the panel P will be described. First, the sheathless electric wire 30, grommet 40, waterproof sheet 50, fastener 60, and exterior member 70 are prepared. Next, the grommet 40 is attached to the panel P by fitting the recessed portion 47 of the main body portion 41 of the grommet 40 to the open end of the panel P (see Figure 1). At this time, the insertion portion 42 and the first cylindrical portion 43 are located outside the vehicle R2 (for example, inside the engine room), and the second cylindrical portion 44 is located inside the vehicle R1. For example, when the grommet 40 is attached to the panel P horizontally, the groove portion 45 is located vertically below the insertion portion 42 because the diameter of the first cylindrical portion 43 is larger than that of the insertion portion 42.

[0025] Furthermore, the waterproofing sheet 50 is wrapped around the outer surface of the sheathless wire 30 (i.e., the braided conductor 20) in a cylindrical shape so that it is in close contact with the outer surface, with the base material layer 51 facing radially outward. At this time, it is preferable to overlap the circumferential ends of the waterproofing sheet 50 in the circumferential direction. The waterproofing sheet 50 wrapped around the sheathless wire 30 is maintained in that state by the self-fusing properties of the sealing compound layer 52. Note that the order in which the grommet 40 is attached to the panel P and the waterproofing sheet 50 is wrapped around the sheathless wire 30 does not matter. Because the sealing compound layer 52 is integrated with the base material layer 51, the likelihood of the sealing compound layer 52 adhering to the worker's hands, etc., is suppressed compared to when the sealing compound layer 52 is used alone. As a result, the workability of wrapping the waterproofing sheet 50 is significantly improved.

[0026] Next, the sheathless electric wire 30, which has the waterproofing sheet 50 wrapped around it, is inserted into the insertion portion 42 of the grommet 40. Specifically, first, the insertion portion 42 is elastically deformed and expanded in diameter using a predetermined switch (not shown), and then the sheathless electric wire 30 is inserted into the insertion portion 42. At this time, the sealing compound layer 52 of the waterproofing sheet 50 wrapped around the sheathless electric wire 30 is covered by the base material layer 51 (the base material layer 51 is exposed to the outside), so compared to the case where the sealing compound layer 52 is exposed to the outside, it is possible to suppress the sealing compound layer 52 from unintentionally adhering to the worker's hands or surrounding materials (such as the switch or the inner surface of the insertion portion 42).

[0027] After the sheathless wire 30 is inserted into the insertion section 42, the switch is removed from the insertion section 42 to elastically return the insertion section 42 to its original position (reduce its diameter). As a result, the inner circumferential surface of the insertion section 42 adheres tightly to the base material layer 51 of the waterproofing sheet 50 wrapped around the sheathless wire 30. Consequently, the waterproofing sheet 50 is sandwiched between the outer circumferential surface of the braided conductor 20 of the sheathless wire 30 and the inner circumferential surface of the insertion section 42 of the grommet 40, resulting in a state where the sealing compound layer 52 adheres tightly to the braided conductor 20 and the base material layer 51 adheres tightly to the inner circumferential surface of the insertion section 42.

[0028] Next, the fastener 60 is wrapped around the outer circumferential surface of the insertion portion 42 of the grommet 40, and the insertion portion 42 is tightened to a predetermined tightening torque to reduce its diameter. As a result, the sealing compound layer 52 of the waterproofing sheet 50 deforms to fill the gaps between the fine conductor wires constituting the braided conductor 20 and the pores in the base material layer 51 of the waterproofing sheet 50 (see the white arrow in Figure 5). This prevents water and other substances from passing through the insertion portion 42 through the braided conductor 20. Furthermore, since the sealing compound layer 52 can be pushed out toward the inner circumferential surface of the insertion portion 42 through the pores in the base material layer 51, water and other substances are also prevented from passing through the insertion portion 42 between the waterproofing sheet 50 and the inner circumferential surface of the insertion portion 42.

[0029] Next, the outer covering member 70 is attached to the sheathless wire 30. Specifically, the outer covering member 70 is attached to the portion of the sheathless wire 30 that is not inserted through the grommet 40. This protects the sheathless wire 30 inside the outer covering member 70 from interference with the outside. In this example, the outer covering member 70 is attached to the sheathless wire 30, but it is not necessary for the outer covering member 70 to be attached to the sheathless wire 30. With the above steps completed, the wire harness 1 is finished, and the wiring work to attach the wire harness 1 to the panel P is also completed.

[0030] In this way, the wire harness 1 attached to panel P normally prevents water and other substances from entering the interior R1 of the vehicle from outside R2 (for example, inside the engine compartment). However, if a certain amount of water pressure is applied to the grommet 40 for a predetermined period of time, there is a considerable risk that water and other substances may enter through the gap between the waterproof sheet 50 and the inner surface of the insertion portion 42.

[0031] For example, if water enters through the gap between the waterproof sheet 50 and the inner surface of the insertion section 42, the invading water will flow towards the interior of the vehicle R1 (right side of the paper in Figures 7 and 8). However, water that enters through the insertion section 42 will flow out into the first cylindrical section 43. Here, since the groove 45 is located vertically below the insertion section 42, the water that flows out into the first cylindrical section 43 will flow into the groove 45.

[0032] Water that flows into the groove 45 accumulates within the groove 45 because the bottom surface of the groove 45 (i.e., the inner circumferential surface 43a of the first cylindrical portion 43) is located radially outward from the inner circumferential surface 44a of the second cylindrical portion 44. In addition, because the first cylindrical portion 43 is located outside the vehicle R2 (for example, inside the engine compartment), water that enters through the gap between the waterproofing sheet 50 and the inner circumferential surface of the insertion portion 42 and accumulates in the groove 45 evaporates due to the ambient temperature (specifically, the high temperature outside the vehicle R2). As a result, even if water or other substances were to enter through the gap between the waterproofing sheet 50 and the inner circumferential surface of the insertion portion 42, the intrusion of water or other substances into the vehicle interior R1 can be suppressed.

[0033] <Effects and Actions> According to the wire harness 1 of this embodiment, a waterproof sheet 50 is provided between the sheathless electric wire 30 and the inner surface of the insertion portion 42 of the grommet 40, resulting in superior waterproofing at the insertion portion 42 of the grommet 40. In addition, since the first cylindrical portion 43 of the main body portion 41 of the grommet 40 has a groove portion 45, even if water or the like enters through the gap between the waterproof sheet 50 and the inner surface of the insertion portion 42, the invading water or the like will flow into the groove portion 45 and accumulate there. The water or the like accumulated in the groove portion 45 will then evaporate due to the ambient temperature outside the vehicle R2 (for example, inside the engine compartment). As a result, the wire harness 1 of this embodiment has superior waterproofing compared to conventional wire harnesses.

[0034] Furthermore, according to the wire harness of this embodiment, since the groove portion 45 is provided on the inner circumferential surface 43a of the first cylindrical portion 43 over the entire circumference in the circumferential direction, workability is improved compared to the case where the groove portion 45 is provided only on a part of the circumferential direction. Specifically, when the groove portion 45 is provided only on a part of the circumferential direction, when attaching the grommet 40 to the panel P, the circumferential orientation of the grommet 40 must be adjusted so that the groove portion 45 is located vertically below the insertion portion 42. However, when the groove portion 45 is provided over the entire circumference in the circumferential direction, the above adjustment is not necessary.

[0035] Furthermore, according to the wire harness 1 of this embodiment, the grommet 40 has a rib 46 that protrudes radially inward from the bottom surface of the groove 45 (i.e., the inner circumferential surface 43a of the first cylindrical portion 43) (in other words, it extends to connect the inner groove walls 45a and 45b that face each other in the axial direction), thereby ensuring the strength of the grommet 40. Specifically, the grommet 40 of this embodiment has a groove 45, and therefore does not have material in the area where it would normally have material. This may reduce rigidity and decrease the holding force to the panel P. However, by having a rib 46, it is possible to suppress the reduction in volume of the groove 45 while also suppressing the reduction in rigidity of the grommet 40.

[0036] Furthermore, according to the wire harness 1 of this embodiment, the protruding end face 46a of the rib 46 is located radially outward from the inner circumferential surface 44a of the second cylindrical portion 44. As a result, even if the water that enters fills up completely in one space S sandwiched between adjacent ribs 46 in the groove portion 45, it will flow over the protruding end face 46a and into other adjacent spaces S. In this way, if the protruding end face 46a of the rib 46 is located radially outward from the inner circumferential surface 44a of the second cylindrical portion 44, the water that enters can be sufficiently stored in the groove portion 45 (multiple spaces S).

[0037] Furthermore, the grommet 40 according to this embodiment also exhibits the above-described effects and benefits.

[0038] <Other forms> Furthermore, the present invention is not limited to the embodiments described above, and can be modified, improved, etc., as appropriate. In addition, the material, shape, dimensions, number, placement, etc. of each component in the embodiments described above are arbitrary and not limited, as long as they can achieve the present invention.

[0039] For example, in the above embodiment, a sheathless wire 30 is used in which a braided conductor 20 covers the outer circumference of a single wire 10 (see Figure 5). In contrast, as shown in Figure 9, a sheathless wire 30 may be used in which a braided conductor 20 covers the outer circumference of multiple (two in Figure 9) wires 10 collectively. In this case, as shown in Figure 9, it is preferable that a wire-to-wire waterproofing material 80 is provided to fill the gaps between the multiple wires 10, and that the braided conductor 20 covers the multiple wires 10 and the wire-to-wire waterproofing material 80 collectively. This makes it possible to suppress the intrusion of water and other substances through the gaps between the multiple wires 10. The wire-to-wire waterproofing material 80 may be made of, for example, EPDM (ethylene propylene diene rubber).

[0040] Furthermore, in the above embodiment, the sealing compound layer 52 is arranged such that the base layer 51 is located radially outside the sealing compound layer 52. However, conversely, the sealing compound layer 52 may be arranged such that the base layer 51 is located radially inside the sealing compound layer 52.

[0041] Herein, the features of the embodiments of the wire harness and grommet according to the present invention described above are briefly listed below in [1] to [5]. [1] A wire harness (1) is partially routed within a space isolated from the outside by a surrounding partition wall (panel P), Electric wire (10) and, The braided conductor (20) covering the aforementioned electric wire, A grommet (40) having a cylindrical insertion portion (42) through which the electric wire and the braided conductor are inserted, The system includes a watertight sheet (50) sandwiched between the inner circumferential surface of the insertion portion and the braided conductor, The grommet (40) is It will be attached to the partition wall so as to close the opening provided in the partition wall. The main body portion (41) has a recessed portion (47) on its outer surface that is recessed radially inward so that the opening end of the aforementioned opening fits into it. The main body (41) is, A first cylindrical portion (43) located on the insertion portion (42) side of the recessed portion (47), It has a second cylindrical portion (44) located on the opposite side of the insertion portion (42) from the recessed portion (47), The first cylindrical portion (43) is The inner circumferential surface (43a) has a groove (45) that is recessed such that at least a portion of it is located radially outward from the inner circumferential surface (44a) of the second cylindrical portion. Wire harness (1). [2] In the wire harness (1) described in [1] above, The groove portion (45) is Provided on the inner circumferential surface (43a) of the first cylindrical portion (43) over the entire circumference in the circumferential direction, Wire harness (1). [3] In the wire harness (1) described in [1] or [2] above, The grommet (40) is The groove has a rib (46) that protrudes radially inward from the bottom surface of the groove, Wire harness (1). [4] In the wire harness described in [3] above, The protruding end face of the rib is located radially outward from the inner circumferential surface of the second cylindrical portion. Wire harness. [5] A grommet (40) that will be attached to the partition wall so as to close an opening provided in the partition wall, The insertion section (42) through which the electric wire (10) will be inserted, The main body portion (41) has a recessed portion (47) that is recessed radially inward so as to fit the edge of the opening, The main body (41) is, A first cylindrical portion (43) located on the insertion side of the recessed portion (47), It has a second cylindrical portion (44) located on the opposite side of the insertion portion from the recessed portion (47), The first cylindrical portion (43) is The inner circumferential surface (43a) has a groove (45) that is recessed such that at least a portion of it is located radially outward from the inner circumferential surface (44a) of the second cylindrical portion (44), Grommets (40). [Explanation of symbols]

[0042] 1 Wire harness 10 Electric wire 20 Braided Conductors 30 Sheathless electric wires 40 grommets 41 Main body 42 Insertion part 43. First cylindrical section 43a Inner surface 44 Second cylindrical section 44a Inner surface 45 Groove 45a Groove inner wall 45b Groove inner wall 46 Ribs 46a Projecting end surface 47 Recessed area 50 Waterproof sheet 60 Fixtures 70 Exterior components 80. Water-stopping material between electrical wires 100 Routing structure P Panel R1 interior R2 Outside the vehicle

Claims

1. A wire harness in which a portion is routed within a space isolated from the outside by surrounding partitions, Power lines and, A braided conductor covering the aforementioned electric wire, A grommet having a cylindrical insertion portion through which the electric wire and the braided conductor are inserted, The system includes a watertight sheet sandwiched between the inner circumferential surface of the insertion portion and the braided conductor, The grommet is, It will be attached to the partition wall so as to close the opening provided in the partition wall. The main body has a recess on its outer surface that is recessed radially inward so as to fit the opening end of the aforementioned opening, The main body is, A first cylindrical portion located on the insertion side of the recessed portion, It has a second cylindrical portion located on the opposite side of the insertion portion from the recessed portion, The first cylindrical portion is, At least a portion of the inner circumferential surface has a groove that is recessed so as to be located radially outward from the inner circumferential surface of the second cylindrical portion, The internal space of the groove located radially outward from the inner circumferential surface of the second cylindrical portion is defined by the bottom surface of the tapered groove, which is the inner circumferential surface of the first cylindrical portion having a tapered shape that increases in diameter from the insertion portion side toward the second cylindrical portion side, and the side surface of the groove extending radially inward toward the radial side of the first cylindrical portion from the end of the bottom surface toward the second cylindrical portion side, On the bottom surface of the groove, a plurality of ribs are provided that protrude radially inward from the first cylindrical portion and extend along the axial direction of the first cylindrical portion, connecting to the side surface of the groove, arranged at intervals in the circumferential direction of the first cylindrical portion. Wire harness.

2. In the wire harness according to claim 1, The groove portion is Provided on the inner surface of the first cylindrical portion over the entire circumference in the circumferential direction, Wire harness.

3. In the wire harness according to claim 1 or claim 2, The protruding end face of the rib is located radially outward from the inner circumferential surface of the second cylindrical portion. Wire harness.

4. A grommet that will be attached to a partition wall so as to close an opening provided in the partition wall, The insertion point through which the electric wire will be inserted, The main body has a recess on its outer surface that is recessed radially inward so as to fit the edge of the opening, The main body is, A first cylindrical portion located on the insertion side of the recessed portion, It has a second cylindrical portion located on the opposite side of the insertion portion from the recessed portion, The first cylindrical portion is, At least a portion of the inner circumferential surface has a groove that is recessed so as to be located radially outward from the inner circumferential surface of the second cylindrical portion, The internal space of the groove located radially outward from the inner circumferential surface of the second cylindrical portion is defined by the bottom surface of the tapered groove, which is the inner circumferential surface of the first cylindrical portion having a tapered shape that increases in diameter from the insertion portion side toward the second cylindrical portion side, and the side surface of the groove extending radially inward toward the radial side of the first cylindrical portion from the end of the bottom surface toward the second cylindrical portion side, On the bottom surface of the groove, a plurality of ribs are provided that protrude radially inward from the first cylindrical portion and extend along the axial direction of the first cylindrical portion, connecting to the side surface of the groove, arranged at intervals in the circumferential direction of the first cylindrical portion. Grommet.

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