Grommet

Abstract

To provide a grommet capable of inserting a bundle of plural long bodies into an insertion cylinder part without deteriorating a water cut-off performance.SOLUTION: A grommet 1 mounted to an opening 201 provided on a panel material 200, holding plural wire harnesses 101 inserted into the opening 201, and constituted of an elastic material comprises: a circular ring part 21 mounted to the opening 201; and a tubular insertion part 23 extending from the circular ring part 21 and having a second insertion space S2 for inserting the plural wire harnesses 101 at once. An inner convex-shaped part 26 corresponding to a shape of a concave part 102 in an outer shape of a cross section orthogonal to the plural bundled wire harnesses 101 in a longitudinal direction is provided to every concave part 102 on an inner face of the tubular insertion part 23 forming the second insertion space S2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a grommet that is attached to an opening provided in a panel material such as an automobile dash panel, and elastically supports an elongated object such as a wire harness that passes through the opening. [Background technology]

[0002] For example, when routing a long object such as a wire harness between the passenger compartment and the engine compartment of an automobile, the long object is routed by being inserted through an opening provided in a panel material such as a dash panel or floor panel that separates the passenger compartment from the engine compartment.

[0003] In this case, as shown in Patent Document 1, the long object is inserted into a cylindrical insertion portion provided in a grommet made of an elastic material such as rubber, and the grommet is attached to the opening and elastically supported, thereby preventing damage to the long object due to contact with the peripheral edge of the opening in the panel material and ensuring waterproofing to prevent water from entering through the opening.

[0004] Electric and hybrid vehicles, which have been increasing in number recently, have more long-length wiring systems such as wire harnesses than conventional vehicles. Furthermore, even conventional vehicles may have multiple long-length wiring systems due to the diversification of electrical equipment and devices.

[0005] Therefore, a plurality of elongated objects are inserted through the same opening, and a plurality of elongated objects are inserted through one grommet. In order to insert multiple elongated objects into the insertion tube, the multiple elongated objects are bundled together and then inserted. When multiple elongated objects are bundled together, recesses are formed between adjacent elongated objects in the bundle. Therefore, when the bundled elongated objects are inserted into the insertion tube, gaps are formed between the bundled elongated objects and the inner surface of the insertion tube, which may reduce the waterproofing properties. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-219123 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a grommet in which a plurality of elongated members can be bundled together and inserted into a cylindrical insertion portion without reducing watertightness. [Means for solving the problem]

[0008] This invention provides a grommet made of an elastic material that is attached to an opening provided in a panel material and holds a plurality of elongated bodies that pass through the opening, and is equipped with a base portion that is attached to the opening, and a tubular insertion tube portion that extends from the base portion and has an insertion space through which the plurality of elongated bodies are inserted together, and is characterized in that the inner surface of the insertion tube portion that forms the insertion space is provided with an inner surface convex portion that has a convex shape corresponding to the shape of the concave portion in the outer shape of a cross section perpendicular to the longitudinal direction of the bundled plurality of elongated bodies, for all of the concave portions.

[0009] The panel material is a thin plate material having a flat surface around the periphery of the opening on which the engaging portion can be engaged, and may be any suitable panel material such as a dash panel or floor panel in an automobile. The opening may be an approximately circular, elliptical, or elongated opening.

[0010] The long body includes a bundle of insulated electric wires formed by bundling multiple insulated electric wires, a single insulated electric wire, a communication cable such as an optical fiber cable for transmitting information, a bundle of communication cables, various cables such as a clutch cable, or a combination of these.

[0011] The recess in the external shape of the cross section perpendicular to the longitudinal direction of the bundled elongated bodies is a recess formed near the longitudinal center of the approximately figure-eight-shaped cross section in the case of two elongated bodies, a recess formed near the center of each side of the approximately triangular cross section in the case of three elongated bodies arranged in a triangle, and a recess formed near the center of each side of the approximately rectangular cross section in the case of four elongated bodies arranged in a square. Furthermore, in the case of three or more elongated bodies arranged in a row, it is a recess formed between the elongated bodies adjacent in the arrangement direction.

[0012] The inner convex portion, which has a convex shape corresponding to the shape of the above-mentioned concave portion, includes a convex shape that roughly matches the shape of the concave portion, which is the above-mentioned concave portion, and a convex shape that is similar to the shape of the concave portion, but any shape is acceptable as long as it can enter the concave portion and ensure a predetermined water-tightness when the elongated body is inserted into the insertion tube portion.

[0013] According to this invention, a plurality of elongated objects can be bundled together and inserted into the insertion tube without reducing the waterproofing property. In more detail, the grommet is made of an elastic material and is attached to an opening provided in a panel material to hold a plurality of elongated bodies that pass through the opening. The grommet includes a cylindrical insertion tube portion that extends from a base portion attached to the opening and has an insertion space through which the plurality of elongated bodies are inserted together. The inner surface of the insertion tube portion that forms the insertion space is provided with an inner surface convex portion that has a convex shape corresponding to the shape of the concave portion in the outer shape of a cross section perpendicular to the longitudinal direction of the bundled elongated bodies. Therefore, the inner surface convex portion that has a convex shape provided on the inner surface of the insertion tube portion that forms the insertion space fits into all of the concave portions formed in the outer shape of the elongated bodies that pass through the insertion tube portion. Therefore, no gap is generated between the inner surface of the insertion tube portion that forms the insertion space and the bundled elongated objects, thereby preventing a decrease in watertightness due to insertion of the bundled elongated objects into the insertion tube portion and allowing the bundled elongated objects to be inserted into the insertion tube portion without a decrease in watertightness. Therefore, the elongated objects can be inserted into the openings in the panel material while preventing damage to the elongated objects due to contact with the periphery of the openings in the panel material and ensuring watertightness that prevents water from entering through the openings.

[0014] Furthermore, although multiple elongated bodies are inserted into one insertion tube portion, multiple elongated bodies are inserted into the insertion tube portion together, and the convex inner surface convex portion, which is a convex shape provided on the inner surface of the insertion tube portion and forms the insertion space, fits into all of the recesses formed on the outer shape of the elongated bodies inserted into the insertion tube portion.Therefore, the insertion and exit points of the elongated bodies are not mixed on one side and the other side of the insertion direction relative to the base portion.In other words, when attached to the panel material, there is no chance of mistaking the elongated bodies for one side and the other side of the panel material, thereby improving the ease of routing of the elongated bodies.

[0015] As an aspect of the present invention, the inner surface convex portion may be provided along the extending direction of the insertion space. The above-mentioned "the inner convex portion is provided along the extending direction of the insertion space" includes providing it over the entire range in the extending direction of the insertion space, providing it over almost the entire range except for a part, or providing it over at least a part of it. Note that the inner convex portion may be provided continuously along the extending direction of the insertion space, or including providing a plurality of inner convex portions at predetermined intervals.

[0016] With this invention, the inner convex portion fits into each of the recesses formed on the outer shape of the elongated body that is inserted into the insertion tube portion along the extension direction, allowing multiple elongated bodies to be bundled together and inserted into the insertion tube portion without reducing water-tightness.

[0017] In another aspect of the present invention, the insertion space may be formed so that its diameter gradually expands from the tip side toward the base end side, which is the side of the base portion, and the protruding height of the inner convex portion gradually increases. This invention loosens the constraint on the base end side of the elongated object inserted into the insertion space of the insertion tube portion, thereby improving the degree of freedom of the elongated object inserted into the insertion tube portion on the base portion side, thereby improving the ease of routing of the elongated objects in a bundled state.

[0018] As another aspect of the present invention, the inner surface convex portion may be provided on at least a portion of the insertion space in the extending direction. According to this invention, when the elongated body is inserted into the insertion space of the insertion tube portion, the insertion tube portion and the elongated body come into close contact at the location where the inner convex portion is provided. In other words, the insertion tube portion and the elongated body do not come into close contact at the location where the inner convex portion is not provided. This improves the workability of inserting the elongated body into the insertion tube portion, for example, using a tool called an inserter.

[0019] As another aspect of the present invention, the inner surface convex portion may be provided at a plurality of locations spaced apart in the extending direction of the insertion space. According to this invention, the inner surface convex portions provided at multiple locations at a predetermined interval in the extension direction bring the inner surface of the insertion tube portion and the outer surface of the elongated body into tight contact with each other, thereby improving the ease of insertion work and ensuring watertightness compared to when the inner surface convex portions are provided over the entire range along the extension direction.

[0020] Furthermore, compared to when the inner surface convex portion is provided over the entire range along the extension direction, the points where the inner surface of the insertion tube portion and the outer surface of the elongated body are in close contact are arranged at a predetermined interval, thereby improving the flexibility of the insertion tube portion through which the bundled elongated bodies are inserted. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a grommet in which a plurality of elongated members can be bundled together and inserted into a cylindrical insertion portion without reducing the waterproofing property. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 4 is an explanatory diagram of the grommet in an attached state. [Figure 2] FIG. 4 is an explanatory diagram of the grommet in an attached state. [Figure 3] An explanatory diagram of a grommet. [Figure 4] An explanatory diagram of a grommet. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 10 is an explanatory diagram of a grommet according to another embodiment. [Figure 8] FIG. 10 is an explanatory diagram of a grommet according to another embodiment in an inserted state. DETAILED DESCRIPTION OF THE INVENTION

[0023] An embodiment of the present invention will be described below with reference to the drawings. The grommet 1 in this embodiment will be described in detail with reference to FIGS.

[0024] 1 is an explanatory diagram of the grommet 1 in an attached state, and FIG. 2 is a plan view of the grommet 1 in an attached state. In detail, Fig. 1(a) is a perspective view showing the front, right side and plan of grommet 1 in an installed state, Fig. 1(b) is a perspective view showing the back, right side and bottom of grommet 1 in an installed state, Fig. 2(a) is a perspective view showing the front, right side and plan of grommet 1 in a disassembled state, and Fig. 2(b) is a perspective view showing the back, right side and bottom of grommet 1 in a disassembled state. In Figs. 1 and 2, panel material 200 having opening 201 for installing grommet 1 is made of a donut-shaped plate material for convenience, and is shown in a see-through state.

[0025] 3 and 4 are explanatory diagrams of the grommet 1. In detail, FIG. 3(a) shows a front view of the grommet 1, FIG. 3(b) shows a rear view of the grommet 1, and FIG. 3(c) shows a bottom view of the grommet 1. FIG. 4(a) shows a cross-sectional view taken along the line AA in FIG. 3(a), and FIG. 4(b) shows a cross-sectional view taken along the line BB in FIG. 3(a). FIG. 5(a) shows a cross-sectional view taken along the line AA in FIG. 3(a) of the grommet 1 with the harness bundle 100 inserted therethrough, and FIG. 5(b) shows a cross-sectional view taken along the line BB in FIG. 3(a) in the same state. FIG. 6(a) shows a front view of the grommet 1 with the harness bundle 100 inserted therethrough, and FIG. 6(b) shows a rear view of the grommet 1 in the same state.

[0026] In FIG. 1, the longitudinal direction of the harness bundle 100, which is the direction connecting the lower left side and the upper right side, is the insertion direction L, the direction perpendicular to the insertion direction L and connecting the upper left side and the lower right side is the width direction W, and the direction perpendicular to the insertion direction L and the width direction W is the up-down direction H. 1(a), the lower left side in the insertion direction L is the front side LF, the upper right side is the back side Lb, the upper left side in the width direction W is the left side WL, and the lower right side is the right side WR. Furthermore, the upper side in the up-down direction H is the upper side HU, and the lower side is the lower side HD.

[0027] The grommet 1 is attached to an opening 201 provided in a panel material 200 such as a dash panel or floor panel of a vehicle, and serves to hold a plurality of harness bundles 100 passing through the opening 201 .

[0028] In this embodiment, the harness bundle 100 electrically connects electrical equipment, a power supply unit, etc. mounted on a vehicle, and is configured by bundling wire harnesses 101, each formed by bundling a plurality of insulated wires, with a tape or the like (not shown). Specifically, the wire harnesses 101, each having a circular cross section, are arranged in three directions and are brought into close contact with each other to form the harness bundle 100 having a substantially triangular cross section. In the harness bundle 100 configured by arranging and bundling the wire harnesses 101, each having a circular cross section, in three directions, recessed portions formed between adjacent wire harnesses 101 in the circumferential direction are referred to as recesses 102.

[0029] The wire harness 101 may be formed of a single covered electric wire, a bundle of communication cables such as optical fiber cables for transmitting information, or a bundle of various cables such as clutch cables. The three wire harnesses 101 constituting the harness bundle 100 are each formed to have the same diameter, but the harness bundle 100 may be formed by bundling wire harnesses 101 of different diameters. The harness bundle 100 may also be formed by bundling two, four, or more wire harnesses 101 other than three.

[0030] The grommet 1 is constructed by assembling an inner member 10 made of resin and a grommet body member 20 having appropriate elasticity. The inner member 10 is composed of a ring portion 11 that is circular in front view, and a flange portion 12 that protrudes radially outward from the end of the ring portion 11 on the far side LB.

[0031] The grommet main body member 20 is integrally formed of a circular ring portion 21 that is circular in shape when viewed from the front, a truncated cone portion 22 that protrudes in an approximately truncated cone shape from the inner diameter of the circular ring portion 21 toward the front side LF, and a cylindrical insertion portion 23 that protrudes from the tip of the truncated cone portion 22 toward the front side LF. The circular ring portion 21 is disk-shaped and slightly larger than the outer diameter of the flange portion 12, and has a locking side wall portion 24 that protrudes from the outer peripheral edge toward the front side LF and has a locking recess 25 that locks into the opening 201 of the panel material 200.

[0032] The truncated cone portion 22 is formed to have approximately the same height as the inner member 10, and has a cylindrical insertion portion 23 extending from the tip on the inner diameter side and projecting toward the front side LF. Inside the truncated cone portion 22, a first insertion space S1 is formed which penetrates in the insertion direction L and is formed in a substantially truncated cone shape.

[0033] The cylindrical insertion portion 23 has a cylindrical shape that protrudes from the tip of the inner diameter side of the truncated cone portion 22 toward the front side LF, and has a thick-walled portion 231 that protrudes radially outward at the tip. A second insertion space S2 that penetrates the cylindrical insertion portion 23 in the insertion direction L and through which the harness bundle 100 is inserted is formed inside the cylindrical insertion portion 23. The second insertion space S2 has an end portion LB on the rear side that communicates with the first insertion space S1 inside the truncated cone portion 22, and penetrates the grommet main body member 20 in the insertion direction L, forming an insertion space S through which the harness bundle 100 can be inserted.

[0034] The second insertion space S2 that penetrates the tubular insertion portion 23 in the insertion direction L has a cross section perpendicular to the insertion direction L at the end of the upper side HU that is formed in a shape that is slightly smaller and approximately similar to the cross-sectional shape of the harness bundle 100 that bundles three wire harnesses 101, and gradually expands in a similar shape toward the lower side HD.

[0035] More specifically, the upper side HU of the second insertion space S2 forms an inner surface having a cross-sectional shape identical to the cross-sectional shape of the harness bundle 100 arranged in three directions so as to be in contact with the wire harness 101, which has a circular cross section, i.e., the Malfatti circle of an equilateral triangle. Specifically, as shown in Fig. 3(a) in a plan view, inner surface convex portions 26 protruding radially inward from the imaginary circle Vc are arranged in three directions.

[0036] The inner convex portion 26 has a shape corresponding to the recess 102 formed between circumferentially adjacent wire harnesses 101 in the harness bundle 100, and is formed in a triangular shape in a plan view with two opposing sides having arc shapes that protrude inward, and the two arc sides are arc-shaped with a diameter slightly smaller than the radius of the wire harness 101.

[0037] As described above, the second insertion space S2 gradually expands toward the lower side HD as shown in Fig. 3(b), and therefore the inner surface convex portion 26 also expands. Specifically, the imaginary circle Vc also gradually expands toward the lower side HD, and the inner surface convex portion 26 protruding from the expanding imaginary circle Vc also gradually expands, so that the end of the upper side HU of the second insertion space S2 and the end of the lower side HD have similar shapes, and it is possible to form the second insertion space S2 that widens toward the lower side HD as shown in Fig. 4. In this embodiment, the end of the upper side HU of the second insertion space S2 and the end of the lower side HD are formed to have similar shapes that are about 1.5 times larger.

[0038] The grommet 1 can be constructed by assembling the inner member 10 and the grommet main body member 20 so that the flange portion 12 of the inner member 10 fits inside the locking side wall portion 24 of the circular ring portion 21 in the grommet main body member 20 constructed in this manner.

[0039] In order to insert the harness bundle 100 into the insertion space S of the grommet 1, which is formed by assembling the inner member 10 and the grommet main body member 20, a tool such as an inserter is used to expand the diameter of the tubular insertion portion 23 before inserting the harness bundle 100.

[0040] When the harness bundle 100 is inserted into the insertion space S, the harness bundle 100 inserted into the second insertion space S2 comes into close contact near the end of the upper side HU of the second insertion space S2, which is formed slightly smaller than the cross-sectional shape of the harness bundle 100, as shown in Figures 5 and 6, and a gap gradually forms between the harness bundle 100 and the inner surface of the tubular insertion portion 23 that forms the second insertion space S2 toward the lower side HD.

[0041] In this way, near the end of the upper side HU of the second insertion space S2, as shown in Figure 6(a), the inner surface convex portion 26 enters into the recess 102 formed between adjacent wire harnesses 101 in the harness bundle 100 formed by bundling three wire harnesses 101, and the inner surface of the second insertion space S2 and the harness bundle 100 are in close contact with each other, so that the harness bundle 100 is firmly restrained by the tubular insertion portion 23.

[0042] Conversely, on the lower side HD of the second insertion space S2, as shown in Figure 6(b), a gap is formed between the harness bundle 100 formed by bundling three wire harnesses 101 and the inner surface of the cylindrical insertion portion 23 that forms the second insertion space S2, so that the harness bundle 100 can move by the amount of the gap in the second insertion space S2. In addition, in the harness bundle 100 inserted into the second insertion space S2, gaps formed between the three wire harnesses 101 are preferably sealed by injecting resin or the like.

[0043] In this way, the circular ring portion 21 of the grommet main body member 20 of the grommet 1 with the harness bundle 100 inserted into the insertion space S is inserted into the wire harness 101 of the harness bundle 100, and the peripheral portion of the opening 201 is aligned with the locking recess 25 provided in the circular ring portion 21 of the grommet main body member 20, so that the grommet 1 with the harness bundle 100 inserted into the insertion space S can be attached to the panel material 200.

[0044] The grommet 1 configured as described above is attached to an opening 201 provided in a panel material 200 and holds a plurality of wire harnesses 101 passing through the opening 201. The grommet 1 includes a circular ring portion 21 made of an elastic material and attached to the opening 201, and a cylindrical insertion portion 23 extending from the circular ring portion 21 and having a second insertion space S2 through which the plurality of wire harnesses 101 are collectively inserted. Further, on the inner surface of the cylindrical insertion portion 23 that forms the second insertion space S2, inner surface convex portions 26 having convex shapes corresponding to the shapes of the concave portions 102 in the outline of a cross section perpendicular to the longitudinal direction of the bundled plurality of wire harnesses 101 are provided for all of the concave portions 102. Therefore, the plurality of wire harnesses 101 can be bundled and inserted through the cylindrical insertion portion 23 without reducing the waterproofing property.

[0045] More specifically, the grommet 1 is made of an elastic material and is attached to an opening 201 provided in a panel material 200 to hold a plurality of wire harnesses 101 passing through the opening 201. The grommet 1 includes a cylindrical insertion portion 23 extending from a circular ring portion 21 attached to the opening 201 and having a second insertion space S2 through which a harness bundle 100 obtained by bundling the plurality of wire harnesses 101 is inserted. On the inner surface of the cylindrical insertion portion 23 forming the second insertion space S2, inner surface convex portions 26 having a convex shape corresponding to the shape of the recesses 102 in the outer shape of a cross section perpendicular to the longitudinal direction of the harness bundle 100 obtained by bundling the plurality of wire harnesses 101 are provided for all the recesses 102. Therefore, the inner surface convex portions 26 having a convex shape provided on the inner surface of the cylindrical insertion portion 23 forming the second insertion space S2 fit into all of the recesses 102 formed in the outer shape of the wire harness 101 inserted into the cylindrical insertion portion 23. Therefore, no gap is generated between the harness bundle 100 and the inner surface of the cylindrical insertion portion 23 that forms the second insertion space S2, preventing a decrease in watertightness due to insertion of the harness bundle 100 into the cylindrical insertion portion 23, and the harness bundle 100 bundling a plurality of wire harnesses 101 can be inserted into the cylindrical insertion portion 23 without a decrease in watertightness. Therefore, the wire harness 101 can be inserted into the opening 201 provided in the panel material 200 while preventing damage to the wire harness 101 due to contact with the peripheral edge of the opening 201 provided in the panel material 200 and ensuring watertightness that prevents water from entering through the opening 201.

[0046] Furthermore, although multiple wire harnesses 101 are inserted into one tubular insertion portion 23, a harness bundle 100 bundling multiple wire harnesses 101 is inserted into the tubular insertion portion 23, and the inner surface convex portion 26, which is a convex shape provided on the inner surface of the tubular insertion portion 23 and forms the second insertion space S2, fits into all of the recesses 102 formed on the outer shape of the harness bundle 100 inserted into the tubular insertion portion 23.As a result, the insertion and exit points of the wire harness 101 are not mixed up on the front side LF and the back side LB of the insertion direction L relative to the circular ring portion 21.In other words, when attached to the panel material 200, the wire harness 101 is not mistakenly picked up on the front side LF and the back side LB of the panel material 200, and the ease of routing of the wire harness 101 can be improved.

[0047] Furthermore, since the inner convex portion 26 is arranged along the vertical direction H of the second insertion space S2, the inner convex portion 26 fits along the vertical direction H into each of the recesses 102 formed in the outer shape of the wire harness 101 inserted into the tubular insertion portion 23, and the harness bundle 100 bundling multiple wire harnesses 101 can be inserted into the tubular insertion portion 23 without reducing the watertightness.

[0048] Furthermore, the second insertion space S2 is gradually enlarged in diameter from the upper side HU toward the lower side HD on the side of the circular ring portion 21, and the protruding height of the inner surface convex portion 26 is gradually increased, so that the restraint on the base end side of the harness bundle 100 inserted into the second insertion space S2 of the cylindrical insertion portion 23 can be relaxed, and the degree of freedom on the circular ring portion 21 side of the harness bundle 100 inserted into the cylindrical insertion portion 23 can be improved. Therefore, the ease of routing of the wire harness 101 in a bundled state can be improved.

[0049] In the above description, the second insertion space S2 of the tubular insertion portion 23 is formed so as to gradually widen from the end of the upper HU toward the lower HD. However, it may be formed so as not to widen over a predetermined length from the end of the upper HU, but to gradually widen from below that end toward the lower HD. This widens the area in the second insertion space S2 where the inner surface of the tubular insertion portion 23 and the harness bundle 100 come into close contact, thereby further improving waterproofing. Furthermore, the second insertion space S2 may be formed uniformly from the end of the upper HU to the end of the lower HD, without widening.

[0050] 7 and 8, the second insertion space S2 may be formed in a cylindrical shape with a cross section corresponding to the imaginary circle Vc, and the inner surface convex portions 26 may be provided at a plurality of locations at predetermined intervals in the longitudinal direction (vertical direction H) of the cylindrical insertion portion 23. Below, a description will be given of a grommet 1a in which a plurality of inner surface convex portions 26 are provided at predetermined intervals in the longitudinal direction (vertical direction H) of the cylindrical insertion portion 23, with reference to FIGS.

[0051] Fig. 7(a) shows a cross-sectional view of the grommet 1a as viewed from the arrow AA in Fig. 3(a), and Fig. 7(b) shows a cross-sectional view of the grommet 1a as viewed from the arrow BB in Fig. 3(a). Fig. 8(a) shows a cross-sectional view of the grommet 1a as viewed from the arrow AA in a state where the harness bundle 100 has been inserted, and Fig. 8(b) shows a cross-sectional view of the grommet 1a as viewed from the arrow BB in Fig. 3(a) in the same state. In addition, in the description of the grommet 1a, the same components as those in the grommet 1 described above will be assigned the same reference numerals and the description thereof will be omitted.

[0052] Specifically, as shown in FIG. 7, the grommet 1a forms a cylindrical second insertion space S2a inside the cylindrical insertion portion 23a, the second insertion space S2a having the same diameter as the imaginary circle Vc described in the description of the cylindrical insertion portion 23 above, and is connected to the first insertion space S1 to form the insertion space Sa. However, a gap is formed in the recess 102 between the harness bundle 100 inserted into the second insertion space S2a and the inner surface of the cylindrical insertion portion 23a that forms the second insertion space S2a.

[0053] For this reason, the inner surface convex portions 26a are provided on a plurality of cross sections spaced apart at predetermined intervals in the longitudinal direction (vertical direction H) of the cylindrical insertion portion 23a. In this embodiment, inner convex portions 26a are provided on three cross sections of the cylindrical insertion portion 23a: the end portion on the upper side HU, the end portion on the lower side HD, and the central portion in the up-down direction H of the cylindrical insertion portion 23a.

[0054] In this way, the grommet 1a has the inner surface convex portion 26a provided on at least a portion of the second insertion space S2a in the up-down direction H, so that when the harness bundle 100 is inserted into the second insertion space S2a of the tubular insertion portion 23a, the tubular insertion portion 23a and the harness bundle 100 come into close contact with each other at the portion where the inner surface convex portion 26a is provided. Therefore, in other words, the tubular insertion portion 23a and the harness bundle 100 do not come into close contact with each other at the portion where the inner surface convex portion 26a is not provided, which can improve the workability of inserting the harness bundle 100 into the tubular insertion portion 23a using an inserter, for example.

[0055] Furthermore, since the inner surface convex portions 26a are provided at three locations spaced apart in the vertical direction H of the second insertion space S2a, the inner surface of the tubular insertion portion 23a and the outer surface of the harness bundle 100 are tightly adhered to each other by the inner surface convex portions 26a provided at three locations spaced apart at a predetermined interval in the vertical direction H, thereby improving the ease of insertion work and ensuring watertightness compared to when inner surface convex portions are provided over the entire range along the vertical direction H.

[0056] Furthermore, compared to when the inner surface convex portion is provided over the entire range along the vertical direction H, the points where the inner surface of the tubular insertion portion 23a and the outer surface of the harness bundle 100 are in close contact are arranged at a predetermined interval, thereby improving the flexibility of the tubular insertion portion 23a through which the bundled harness bundle 100 is inserted.

[0057] In correspondence between the configuration of this invention and the above-mentioned embodiment, The panel material of the present invention corresponds to panel material 200, Similarly, The opening corresponds to opening 201, The long body corresponds to the wire harness 101, The grommet is compatible with grommet 1, 1a, The base part corresponds to the circular ring part 21, The insertion spaces correspond to the second insertion spaces S2 and S2a, The insertion tube portion corresponds to the cylindrical insertion portion 23, 23a, The recess corresponds to the recess 102, The inner convex portion corresponds to the inner convex portion 26, 26a, The extension direction corresponds to the vertical direction H, The present invention is not limited to the configurations of the above-described embodiments, and many other embodiments can be obtained.

[0058] For example, the opening 201 described above has a substantially circular shape, but it may have a substantially elliptical shape or a substantially oblong hole shape. In the above description, the harness bundle 100 is formed by bundling three wire harnesses 101, but the number of wire harnesses 101 is not limited to three. For example, when the harness bundle 100 is formed by two wire harnesses 101, the cross section of the harness bundle 100 formed by the two wire harnesses 101 is a substantially figure-8 cross section, and the recess 102 is a recessed portion formed near the center of the substantially figure-8 cross section in the longitudinal direction. When the harness bundle 100 is formed by arranging four wire harnesses 101 in a quadrangle, the recessed portions formed near the center of each side of the substantially quadrangle cross section formed by the four wire harnesses 101 are the recessed portions 102. The harness bundle 100 may also be formed by arranging three or more wire harnesses 101 in a row. In this case, the recessed portions formed between the wire harnesses 101 adjacent to each other in the arrangement direction are the recessed portions 102. Furthermore, by arranging the inner convex portion 26 provided on the tubular insertion portion 23 in a shape and position corresponding to the recess 102 formed according to the number and arrangement of the wire harnesses 101 that make up the harness bundle 100, the same effect as the grommet 1 described above can be achieved. [Explanation of symbols]

[0059] 1,1a...Grommet 21...Circular ring part 23, 23a... Cylindrical insertion portion 26, 26a...Inner convex portion 101...Wire harness 102...recess 200...Panel material 201...Opening H…Vertical direction S2, S2a...Second insertion space

Claims

1. A grommet made of an elastic material that is attached to an opening provided in a panel material and holds a plurality of elongated objects that pass through the opening, a base portion attached to the opening; a cylindrical insertion tube portion extending from the base portion and having an insertion space through which the plurality of elongated bodies are inserted together; On the inner surface of the insertion tube portion forming the insertion space, an inner surface convex portion having a convex shape corresponding to the shape of the concave portion in the outer shape of a cross section perpendicular to the longitudinal direction of the bundled plurality of elongated bodies is provided for all the concave portions. Grommet.

2. The inner surface convex portion is provided along the extending direction of the insertion space. The grommet of claim 1 .

3. The insertion space is formed so that its diameter gradually increases from the tip side toward the base end side, which is the side of the base portion, and the protruding height of the inner convex portion gradually increases. The grommet of claim 2.

4. The inner surface convex portion is provided on at least a part of the insertion space in the extending direction. The grommet of claim 1 .

5. The inner surface convex portion is provided at a plurality of locations spaced apart in the extending direction of the insertion space. The grommet according to claim 4.

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