Corrugated mounting structure

Abstract

To provide a corrugated mounting structure that can prevent water from entering the inside from between a corrugated tube and a grommet at the outer fitting part, and to be easily recovered even when the water stopping performance between the corrugated tube and the grommet is reduced.SOLUTION: A corrugated mounting structure includes a corrugated tube 10 in which small-diameter portions 11 and large-diameter portions 12 are alternately formed along the longitudinal direction X, a grommet 20 fitted onto the corrugated tube 10, and an elastic annular member 30, and the annular member 30 is arranged between the outer peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20 and contacts the outer peripheral surface and the inner peripheral surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a corrugated tube mounting structure, for example, a structure for mounting a corrugated tube and a grommet. [Background technology]

[0002] For example, when wiring a high-voltage electric wire, a corrugated tube into which the high-voltage electric wire is inserted and a grommet fitted onto an end of the corrugated tube may be used. Furthermore, the corrugated tube and the grommet are in close contact with each other at the outer fitting portion between the corrugated tube and the grommet, thereby preventing water from entering the inside of the corrugated tube and the grommet that are assembled between the corrugated tube and the grommet.

[0003] For example, the grommet described in Patent Document 1 has an inner circumferential lip that protrudes radially inward from the inner circumferential surface of the portion that fits onto the corrugated tube. Therefore, when the grommet is fitted onto the corrugated tube, not only are the corrugated tube and the grommet intimately attached to each other at the fitting portion, but the inner circumferential lip also engages with the small diameter portion of the corrugated tube, which is formed into a bellows-like cylindrical shape in which small diameter portions and large diameter portions are alternately continuous.

[0004] As described above, the inner lip engages with the small diameter portion of the corrugated tube, thereby lengthening the water penetration path between the outer surface of the corrugated tube and the inner surface of the grommet in the outer fitting portion, thereby more effectively preventing water from penetrating into the interior from between the grommet and the corrugated tube in the outer fitting portion. However, in the grommet described in Patent Document 1, when the deformation performance of the inner lip is reduced due to deterioration over time or damage, and the water-stopping performance to the inside from between the grommet and the corrugated tube in the outer fitting portion is reduced, the grommet itself has to be replaced and the water-stopping performance cannot be easily restored. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-42023 A Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide a corrugated tube mounting structure that can prevent water from entering the interior from between the corrugated tube and the grommet in the outer fitting portion, and that can easily restore the water-stopping performance between the corrugated tube and the grommet even if it is deteriorated. [Means for solving the problem]

[0007] The present invention is provided with a corrugated tube in which small diameter portions and large diameter portions are alternately formed along the longitudinal direction, a grommet that fits onto an end of the corrugated tube, and an elastic annular member, the annular member being disposed between an inner peripheral surface of the grommet in a fitted state and an outer peripheral surface of the corrugated tube, and being in contact with the outer peripheral surface and the inner peripheral surface. The annular member is disposed on the outer periphery of the small diameter portion of the corrugated tube, and a recess is formed along the circumferential direction at a portion of the inner surface of the grommet where the annular member disposed on the outer periphery of the small diameter portion abuts, the recess being more recessed than other portions. It is characterized by its corrugated mounting structure.

[0008] The annular member may be configured to be sandwiched between the outer peripheral surface of the corrugated tube and the inner peripheral surface of the grommet and to be in close contact with both. The annular member may be formed in a ring shape from an elastic resin and configured to allow the corrugated tube to be inserted therein. It is also preferable that the annular member be formed to have a higher rigidity than the grommet.

[0009] This invention makes it possible to prevent water from entering the interior from between the corrugated tube and the grommet in the outer fitting portion, and also makes it possible to easily restore the water-stopping performance between the corrugated tube and the grommet even if it is deteriorated.

[0010] More specifically, the annular member, which is provided so as to abut against the outer circumferential surface of the corrugated tube and the inner circumferential surface of the grommet in an externally fitted state, is sandwiched between the corrugated tube and the grommet.

[0011] Therefore, the annular member is brought into close contact with the outer peripheral surface of the corrugated tube and the inner peripheral surface of the grommet due to a repulsive force against the sandwiching pressure, and the gap between the corrugated tube and the grommet can be reliably filled. In other words, it is possible to prevent water from entering the inside from between the corrugated tube and the grommet.

[0012] In addition, the annular member is provided separately from the corrugated tube and the grommet. Therefore, even if the deformation performance of the annular member is reduced due to, for example, a pinching load acting thereon or deterioration over time or damage caused by water or water pressure, etc., and sufficient water-stopping performance can no longer be obtained, the water-stopping performance can be easily restored by simply replacing the annular member, without replacing the corrugated tube or the grommet themselves. Furthermore, the annular member can be made of a material different from that of the grommet or its shape can be changed to obtain the desired water-stopping performance.

[0013] Therefore, as described above, it is possible to prevent water from entering the interior from between the corrugated tube and the grommet in the outer fitting portion, and even if the water-stopping performance between the corrugated tube and the grommet deteriorates, it can be easily restored.

[0014] Also, The annular member is disposed on an outer periphery of the small diameter portion of the corrugated tube. Because The annular member is disposed in a groove formed by the small diameter portion and the large diameter portions on both sides of the small diameter portion in the longitudinal direction, and the movement in the longitudinal direction is restricted. This makes it possible to prevent the annular member from unintentionally falling off or becoming detached from the corrugated tube, which would result in a loss of sufficient water-stopping performance.

[0015] Furthermore, the annular member is deformed by the pressure caused by the clamping between the corrugated tube and the grommet so as to fit into the groove. In other words, since the radially inner side of the annular member is restricted by the small diameter portion and the large diameter portion, the annular member, which is deformed by the clamping pressure between the corrugated tube and the grommet, can be prevented from unintentionally deforming in a direction in which it is easily deformed.

[0016] Therefore, deformation of the annular member in an unintended direction can be prevented, the clamping pressure between the corrugated tube and the grommet can be reliably applied to the annular member, and the corrugated tube and the grommet can be reliably brought into close contact with the annular member.

[0017] In addition, when an external force acts in the bending direction of the corrugated tube, the inner portion in the bending direction of the annular member arranged on the outer periphery of the small diameter portion restricts the large diameter portions on either side of the small diameter portion in the longitudinal direction from approaching each other, thereby suppressing deformation of the large diameter portion.

[0018] Therefore, even if an external force acts on the corrugated tube, deformation of the portion of the corrugated tube where the annular member is arranged can be suppressed, and the annular member can be prevented from separating from the inner surface of the grommet as the corrugated tube is bent.

[0019] In other words, unintended deformation of the corrugated tube at the location where the annular member is disposed can be prevented. Therefore, even if the entire corrugated tube is bent into a desired shape, deformation of the corrugated tube is suppressed at the location where the annular member is disposed, and the annular member can be maintained in close contact with the outer circumferential surface of the corrugated tube and the inner circumferential surface of the grommet.

[0020] In this way, by positioning the annular member in the small diameter portion, pressure can be reliably applied to the annular member, and further, the annular member can be reliably adhered to the outer peripheral surface of the corrugated tube and the inner peripheral surface of the grommet, thereby reliably preventing water from entering the interior.

[0021] Ma Ta, A recess is formed along a circumferential direction on an inner surface of the grommet at a portion where the annular member arranged on the outer periphery of the small diameter portion abuts, the recess being more recessed than other portions. Because When the corrugated tube and the grommet are fitted to each other, the annular member comes into contact with a recess on the inner surface of the grommet. By providing a recess against which the annular member comes into contact, the space at the boundary between the corrugated tube and the grommet is expanded. This reduces the water pressure acting on the annular member, making it possible to more effectively prevent water from entering the inside.

[0022] As an aspect of the present invention, the annular member may have a thick-walled annular portion disposed in the small diameter portion of the corrugated tube, and a thin-walled annular portion extending in the longitudinal direction from the thick-walled annular portion to cover the adjacent large diameter portion.

[0023] According to this invention, the outer peripheral surface of the large diameter portion, which protrudes radially outward of the corrugated tube beyond the small diameter portion, can press the thin-walled annular portion against the inner peripheral surface of the grommet so as to be in intimate contact with it. Therefore, the gap between the outer circumferential surface of the large diameter portion and the inner circumferential surface of the grommet can be reliably filled by the thin annular portion.

[0024] Furthermore, when the annular member is deformed by the clamping pressure between the corrugated tube and the grommet, the deformation of the radially inner portion of the thick-walled annular portion is restricted by the above-mentioned groove, and the deformation of the radially outer portion protruding from the above-mentioned groove is restricted by the thin-walled annular portion.

[0025] Therefore, even if pressure is applied to the annular member and the annular member is deformed, the thick-walled annular portion can be prevented from unintentionally deforming in a direction in which the thick-walled annular portion is likely to deform. Therefore, the thick-walled annular portion can be prevented from deforming in an unintentional direction, and pressure can be applied more reliably to the thick-walled annular portion.

[0026] Similarly, when the annular member is deformed by pressure, the thin annular portion is restricted in one of the longitudinal directions by the thick annular portion, so that the thin annular portion is prevented from deforming in an unintended direction. Thus, pressure can be applied more reliably to the thin annular portion.

[0027] Therefore, pressure can be applied more reliably to the annular member, and the corrugated tube and the grommet can be more reliably brought into close contact with each other, thereby more reliably preventing water from entering the interior.

[0028] As a further aspect of the present invention, the annular member may be disposed on an outer periphery of the large diameter portion of the corrugated tube. According to this invention, by disposing the annular member on the outer periphery of the large diameter portion that is closer to the inner periphery of the grommet than the small diameter portion, the annular member can be reliably brought into close contact with the inner periphery of the grommet and the outer periphery of the large diameter portion, thereby reliably preventing water from entering the inside.

[0029] As an aspect of the present invention, the annular member may have a thin-walled annular portion covering the large diameter portion of the corrugated tube, and a thick-walled annular portion extending from the thin-walled annular portion on both sides in the longitudinal direction and disposed on the adjacent small diameter portion.

[0030] According to this invention, the large diameter portion covered by the thin-walled annular portion is sandwiched from both sides in the longitudinal direction by the thick-walled annular portion, thereby preventing the thin-walled annular portion from unintentionally coming off the large diameter portion.

[0031] Furthermore, deformation of the thin-walled annular portion due to the clamping pressure between the corrugated tube and the grommet is restricted by the thick-walled annular portions extending from both sides of the thin-walled annular portion in the longitudinal direction, so that the thin-walled annular portion can be prevented from escaping due to the applied pressure, and pressure can be reliably applied to the thin-walled annular portion supported by the thick-walled annular portions. Therefore, the thin-walled annular portion can be more reliably brought into close contact with the corrugated tube and the grommet, and water can be more reliably prevented from entering the interior.

[0032] As a further aspect of the present invention, a corrugated engagement portion may be provided on the inner peripheral surface of the grommet, protruding radially inward, and the corrugated engagement portion may be disposed on the small diameter portion of the corrugated tube.

[0033] According to this invention, it is possible to prevent the deterioration of the water-stopping performance caused by the annular member, and further to improve the water-stopping performance. More specifically, the annular member is in close contact with the outer peripheral surface of the corrugated tube and the inner peripheral surface of the grommet, as described above. Therefore, when the corrugated tube and the grommet move relatively in the longitudinal direction, the annular member also moves in the longitudinal direction due to friction, and there is a risk that the annular member will be exposed from the grommet. When the annular member is exposed from the grommet in this way, it will not be in sufficient contact with the inner peripheral surface of the grommet, and the water-stopping performance will be reduced.

[0034] In response to this, the corrugated tube engaging portion is disposed in the small diameter portion, i.e., the corrugated tube engaging portion is fitted into a groove formed by the small diameter portion and the large diameter portions on both sides of the small diameter portion in the longitudinal direction, thereby restricting the relative movement between the corrugated tube and the grommet in the longitudinal direction, preventing the annular member from being exposed from the grommet, and preventing a decrease in water-stopping performance.

[0035] Furthermore, since the corrugated engagement portion fits into the above-mentioned groove and is positioned in the gap between the corrugated tube and the grommet, the water-stopping effect is not only achieved by the annular member but also by the corrugated engagement portion, thereby improving the water-stopping performance.

[0036] As a further aspect of the present invention, the annular member may be disposed closer to the corrugated insertion end of the grommet than the corrugated engagement portion. The corrugated tube insertion end side of the grommet refers to the side of the grommet into which the corrugated tube is inserted.

[0037] According to the present invention, the annular member stops water before the corrugated engagement portion disposed in the groove. However, water that penetrates beyond the annular member can be stopped by the corrugated engagement portion. Therefore, the annular member, which comes into contact with more water, is more susceptible to deterioration and damage due to contact with water and water pressure than the corrugated engagement portion.

[0038] In this way, by arranging the easily replaceable annular member on the corrugated insertion end side, deterioration over time and damage to the corrugated engagement part, which cannot be easily replaced, can be suppressed, and the water-stopping performance can be restored for a longer period of time.

[0039] Furthermore, by positioning the annular member closer to the corrugated insertion end than the corrugated engagement portion, the annular member can be replaced without passing through the corrugated engagement portion, which protrudes radially inward, i.e., has a smaller diameter than other portions, making it easier to replace the annular member.

[0040] In another aspect of the present invention, a band may be provided that is fixed to an outer periphery of the grommet, and a band fixing portion may be provided in which the band fits on the outer periphery of the grommet, including the radially outer region of the corrugated engagement portion.

[0041] The band may be in close contact with the outer periphery of the grommet and suppress the expansion of the diameter of the grommet. The band may be capable of reducing the diameter of the radially inner region of the grommet at the band fixing portion by tightening the outer periphery of the grommet. Examples of the band include a cable tie, a rubber band, and the like.

[0042] According to this invention, by tightening the band, unintended expansion of the portion of the grommet including the area in which the corrugated engagement portion is provided can be prevented, and the corrugated engagement portion can be prevented from inadvertently coming off the corrugated tube.

[0043] The corrugated tube engaging portion can be securely fitted into the groove, thereby reliably restricting relative movement between the corrugated tube and the grommet in the longitudinal direction, thereby preventing the corrugated tube from falling off the grommet.

[0044] Furthermore, for example, even if the entire corrugated tube is bent into a desired shape, it is possible to prevent the bent corrugated tube from coming into contact with and deforming the grommet, and it is possible to prevent the corrugated tube from falling out of the deformed grommet unintentionally.

[0045] Furthermore, by tightening the grommet using the band, the radially inner region of the band fixing portion of the grommet is reduced in diameter, allowing the corrugated engagement portion to be pushed toward the small diameter portion, thereby preventing the corrugated engagement portion and the small diameter portion from accidentally coming loose.

[0046] Therefore, the corrugated engagement portion can be securely fitted into the above-mentioned groove, the relative movement between the corrugated tube and the grommet along the longitudinal direction can be more reliably restricted, and the annular member can be more reliably prevented from being exposed from the grommet, thereby more reliably preventing a decrease in water-stopping performance.

[0047] Furthermore, by pushing the corrugated engagement portion radially inward, the corrugated engagement portion and the small diameter portion come into close contact, allowing the corrugated engagement portion to fill the gap between the corrugated tube and the grommet, thereby further improving water-stopping performance.

[0048] In another aspect of the present invention, a band may be provided that is fixed to the outer periphery of the grommet, and a band fixing portion may be provided in which the band fits onto the outer periphery of the grommet on the side opposite the corrugated insertion end side relative to the radially outer region of the annular member.

[0049] According to this invention, the grommet can be prevented from unintentionally expanding, and the corrugated tube can be prevented from falling out of the grommet. Furthermore, for example, even if the entire corrugated tube is bent into a desired shape, the bending of the corrugated tube can be prevented from deforming the grommet, and the corrugated tube can be prevented from falling out of the unintentionally deformed grommet.

[0050] In addition, by tightening the grommet using the band, the radially inner region of the band fixing portion of the grommet is reduced in diameter, bringing the outer peripheral surface of the corrugated tube and the inner peripheral surface of the grommet closer together, thereby further improving the water-stopping performance. That is, even if water passes over the annular member and seeps into the interior, the water can be stopped at the portion fastened by the band, thereby further improving the water stopping performance.

[0051] As a further aspect of the present invention, the band fixing portion may be provided on the outer circumferential surface of the grommet separated from the annular member by one or more of the small diameter portions. According to this invention, the inner peripheral surface of the grommet and the annular member can be brought into closer contact with each other more reliably, and deterioration of the waterproofing performance can be further prevented.

[0052] More specifically, when the band is fastened, the portion of the grommet that corresponds to the band fastening portion is deformed radially inward, and the vicinity of the corresponding portion of the band fastening portion is also deformed in accordance with the deformation of the corresponding portion of the band fastening portion. At this time, the vicinity of the corresponding portion of the band fixing portion is deformed, but the degree of deformation of the grommet decreases as the distance from the band fixing portion increases.

[0053] Therefore, when the annular member is positioned near the corresponding portion of the band fixing portion, depending on the degree of deformation near the corresponding portion of the band fixing portion, a gap may occur between the inner surface of the grommet and the annular member.

[0054] In response to this, by arranging the band fixing portion away from the annular member by one or more of the small diameter portions, the effect of deformation of the grommet due to tightening of the band can be reduced at the location where the annular portion is located on the grommet.

[0055] This makes it possible to suppress deformation of the portion of the grommet where the annular member is disposed due to fastening of the band, and to prevent a gap from being formed between the inner peripheral surface of the grommet and the annular member, i.e., to reliably maintain a tight contact state between the inner peripheral surface of the grommet and the annular member. In this way, the inner peripheral surface of the grommet and the annular member can be brought into closer contact with each other more reliably, and deterioration of the waterproofing performance can be further prevented.

[0056] As another aspect of the present invention, the corrugated sheet engaging portion does not have to be disposed on the corrugated sheet insertion end side of the band fixing portion. With this invention, the corrugated engaging portion, which can be pushed radially inward to fit tightly against the small diameter portion and fill the gap between the corrugated tube and the grommet, is less affected by the tightening of the band fixed by the band fixing portion, and can exhibit water-stopping properties. Effect of the Invention

[0057] This invention makes it possible to provide a corrugated tube mounting structure that can prevent water from entering the interior from between the corrugated tube and the grommet in the outer fitting portion, and that can easily restore the water-stopping performance between the corrugated tube and the grommet even if it is reduced. [Brief description of the drawings]

[0058] [Figure 1] FIG. 2 is an external perspective view showing the appearance of the corrugated mounting structure. [Diagram 2] FIG. 4 is an exploded perspective view of the corrugated wire mounting structure with the cable tie removed. [Diagram 3] An explanatory diagram of each part of the corrugated mounting structure with the cable ties removed. [Figure 4] An explanatory diagram of a cable tie. [Diagram 5] FIG. 4 is an explanatory diagram illustrating how to assemble each part of the corrugated steel mounting structure. [Figure 6] An explanatory diagram of the corrugated tube mounting structure in which the entire corrugated tube is bent. [Figure 7] FIG. 11 is an explanatory diagram of an annular member according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0059] An embodiment of the present invention will now be described with reference to the drawings. Fig. 1 shows an external perspective view of the corrugated wire mounting structure 1, and Fig. 2 shows an exploded perspective view of the corrugated wire mounting structure 1 with a cable tie 40 removed. Note that the cable tie 40 is not shown in Fig. 2.

[0060] Fig. 3 shows an explanatory diagram of the corrugated tube 10, the grommet 20, and the annular member 30 that constitute the corrugated tube mounting structure 1. In detail, Fig. 3(a) shows a cross-sectional view of the corrugated tube 10, Fig. 3(b) shows a cross-sectional view of the grommet 20, and Fig. 3(c) shows a schematic cross-sectional view of the annular member 30.

[0061] Fig. 4 shows an explanatory diagram of the cable tie 40. More specifically, Fig. 4(a) shows a schematic perspective view of a portion of the cable tie 40, and Fig. 4(b) shows a schematic cross-sectional view of the cable tie 40 in a state in which the band portion 42 is inserted through the buckle 41.

[0062] Fig. 5 shows an explanatory diagram for explaining how to assemble the corrugated tube mounting structure 1. In detail, Fig. 5(a) shows a state in which a grommet 20 is fitted onto the corrugated tube 10 to which an annular member 30 is attached. Fig. 5(b) shows a state in which a cable tie 40 is attached to the band fixing portion 21 of the grommet 20 in the state of Fig. 5(a), and Fig. 5(c) shows an enlarged view of the α portion in Fig. 5(b).

[0063] Fig. 6 shows an explanatory diagram of the corrugated tube mounting structure 1 in a state where the corrugated tube 10 is bent as a whole. More specifically, Fig. 6(a) shows a schematic cross-sectional view of the corrugated tube mounting structure 1 in a state where the corrugated tube 10 is bent, and Fig. 6(b) shows an enlarged view of the β portion in Fig. 6(a).

[0064] 1 is defined as a longitudinal direction X. Furthermore, in the longitudinal direction X, the left side in FIG. 1, which is the direction in which the corrugated tube 10 is inserted into the grommet 20, i.e., the side on which the corrugated tube 10 is disposed with respect to the grommet 20, is defined as a +X direction, and the opposite side is defined as a -X direction.

[0065] As shown in Figs. 1 to 3, the corrugated wire mounting structure 1 is formed in a cylindrical shape into which a wire harness WH to be arranged in a vehicle (not shown) can be inserted. The corrugated tube mounting structure 1 comprises a cylindrical corrugated tube 10, a cylindrical grommet 20 fitted onto the outside of the corrugated tube 10, an annular member 30 sandwiched between the corrugated tube 10 and the grommet 20, and a cable tie 40 attached to the outer periphery of the grommet 20.

[0066] The corrugated tube 10 is a hollow tubular protective tube having a substantially uniform thickness through which the wire harness WH can be inserted. As shown in Fig. 3, the corrugated tube 10 has a bellows structure in which small diameter sections 11, whose outer circumferential surface is recessed radially inward over the entire circumference, and large diameter sections 12, whose outer circumferential surface is protruding radially outward over the entire circumference, are alternately arranged along the longitudinal direction X.

[0067] The small diameter portion 11 and the large diameter portion 12 are each formed in a cylindrical shape, and the outer diameter and inner diameter of the small diameter portion 11 are smaller than the outer diameter and inner diameter of the large diameter portion 12. That is, the corrugated tube 10 is formed into a freely bendable bellows-shaped tube shape by alternately and integrally continuing small diameter sections 11 and large diameter sections 12. The small diameter sections 11 and the large diameter sections 12 on both sides in the longitudinal direction X that are continuous with the small diameter sections 11 form groove sections 13 that are recessed radially inward of the corrugated tube 10.

[0068] The groove portion 13 is formed so that the length of the small diameter portion 11 along the longitudinal direction X is shorter than the length of the large diameter portion 12 along the longitudinal direction X, and thus has a generally trapezoidal cross section that narrows toward the radially inward direction of the corrugated tube 10.

[0069] The grommet 20 is formed in a hollow cylindrical shape that can be fitted onto the outside of the corrugated tube 10 inserted from the +X direction. In this specification, only the end portion of the grommet 20 is illustrated, but the entire grommet may be cylindrical, and other portions not illustrated may have any suitable shape.

[0070] The outer peripheral surface of the grommet 20 is provided with a groove-shaped band fixing portion 21 that is recessed in a roughly band-like shape around the entire circumference in order to position the cable tie 40, and the inner peripheral surface of the grommet 20 is provided with a corrugated engagement portion 22 that protrudes a predetermined length radially inward, as shown in Figure 3(b).

[0071] The band fixing portion 21 is formed with a width slightly greater than the sum of twice the length of the small diameter portion 11 along the longitudinal direction X and the length of the large diameter portion 12 along the longitudinal direction X. The +X-direction end of the band fixing portion 21 is disposed at a distance slightly longer than twice the sum of the lengths of the small diameter portion 11 and the large diameter portion 12 along the longitudinal direction X from the +X-direction end of the grommet 20 (see FIG. 5(a)).

[0072] The band fixing portion 21 formed by a band-shaped groove along the circumferential direction has, at one location in the circumferential direction, a buckle fixing groove 24 into which a buckle 41 of a cable tie 40 described later fits (see FIG. 2). The buckle fixing groove 24 is formed as a groove having the same depth as the band fixing part 21, and is formed such that its length along the longitudinal direction X is longer than the length along the longitudinal direction X of the band fixing part 21. The band fixing part 21 formed in this manner is configured so that a cable tie 40 wrapped around the outer periphery of the grommet 20 can be fitted into it.

[0073] The corrugated locking portion 22 is composed of two annular corrugated locking pieces 23 formed so as to protrude radially inward over the entire circumference from a portion of the inner circumferential surface of the grommet 20 that corresponds to the band fixing portion 21 (see FIG. 3(b)). Note that the corrugated locking portion 22 is not disposed on the +X direction side of the band fixing portion 21.

[0074] The two corrugated locking pieces 23 are arranged side by side in the longitudinal direction X at a distance slightly wider than the large diameter portion 12, have an inner diameter larger than the outer diameter of the small diameter portion 11 and smaller than the outer diameter of the large diameter portion 12, and are formed with a height approximately equal to the groove depth of the groove portion 13.

[0075] In addition, each of the corrugated engagement pieces 23 is formed so as to narrow as it approaches the radially inward direction, is formed into a rib shape that is approximately triangular in cross section, and is configured to fit into the groove portion 13 of the corrugated tube 10.

[0076] By fitting the corrugated engagement portion 22 configured in this manner into the groove portion 13 of the corrugated tube 10 as described below, movement of the corrugated tube 10 attached to the grommet 20 in the longitudinal direction X can be restricted.

[0077] The annular member 30 is made of elastic resin and has a generally circular ring shape whose length in the longitudinal direction X is slightly longer than the length of the small diameter portion 11 and the large diameter portion 12 in the longitudinal direction X. As shown in FIG. 3(c), the annular member 30 is integrally formed with a thick-walled annular portion 31 arranged in the small diameter portion 11 of the corrugated tube 10 and a thin-walled annular portion 32 arranged in the small diameter portion 11, with the thick-walled annular portion 31 arranged on the +X direction side.

[0078] The thick-walled annular portion 31 is formed in an annular shape with an outer diameter slightly larger than the inner diameter of the grommet 20 and an inner diameter slightly smaller than the outer diameter of the small diameter portion 11. The thin-walled annular portion 32 is formed in an annular shape with an outer diameter slightly larger than the inner diameter of the grommet 20 and an inner diameter slightly smaller than the outer diameter of the large diameter portion 12.

[0079] The lengths of the thick-walled annular portion 31 and the thin-walled annular portion 32 along the longitudinal direction X are set to lengths corresponding to the lengths of the small diameter portion 11 or the large diameter portion 12 along the longitudinal direction X, respectively, and the thin-walled annular portion 32 is formed to be longer than the thick-walled annular portion 31.

[0080] In this manner, the annular member 30 is formed with an outer diameter slightly larger than the inner diameter of the grommet 20, and is formed into a generally annular shape with an inner diameter that tapers off in a step near the center as it approaches the +X direction. Therefore, when the annular member 30 is attached to the corrugated tube 10, the thick-walled annular portion 31 fits into the groove portion 13 to fill it and adheres closely to the outer peripheral surface of the corrugated tube 10, preventing the annular member 30 from coming off the corrugated tube 10.

[0081] As shown in FIG. 4, the binding band 40 includes a buckle 41 formed in a housing shape and a band portion 42 extending from the buckle 41 in a band shape. The buckle 41 is formed in a rectangular parallelepiped shape with a length in the longitudinal direction X being slightly shorter than the length in the longitudinal direction X of the buckle fixing groove 24. As shown in Fig. 4(a), the buckle 41 is provided with a band locking hole 43 that penetrates in a predetermined direction and through which the band portion 42 can be inserted and irreversibly locked.

[0082] The band locking hole 43 penetrates the buckle 41 in a rectangular shape when viewed from the direction in which the band portion 42 is inserted. As shown in Figure 4(b), the band locking hole 43 is provided with a band locking piece 431 on the surface that abuts against the inner surface of the band portion 42 when it is bent into a ring shape and inserted, which engages with a lockable piece 421 provided on the band portion 42, which will be described later.

[0083] The band locking pieces 431 are arranged in a row and protrude toward the inner surface of the band locking hole 43, with the base end inclined in the insertion direction in which the band portion 42 is inserted and the tip end having a triangular cross-sectional shape that is approximately perpendicular to the inner surface of the band portion 42.

[0084] The band portion 42 is bent into a ring shape and inserted into the band locking hole 43, and has an engaged piece 421 on its inner peripheral surface that engages with a band locking piece 431. This engaging piece 421 has a base end side in the insertion direction through the band engaging hole 43 that is approximately perpendicular to the main surface of the band portion 42, and has multiple lined-up pieces that are triangular in cross section and protrude at an angle toward the tip end.

[0085] That is, the locked piece 421 is formed so that, when the band portion 42 is inserted into the band locking hole 43 , the base end side of the locked piece 421 in the insertion direction and the tip side of the band locking piece 431 engage with each other. The band portion 42 is bent into a ring shape and inserted into the band locking hole 43 of the buckle 41 configured in this manner. This causes the base end surface of the locked piece 421 in the insertion direction to come into contact with the tip end surface of the band locking piece 431, thereby locking the band portion 42 inserted into the band locking hole 43, and preventing it from accidentally coming off the buckle 41.

[0086] At this time, since multiple engaging pieces 421 are arranged in a row along the insertion direction in the band portion 42, by inserting the band portion 42 into the band engaging hole 43 to the desired length, the diameter of the band portion 42 bent into a ring shape can be adjusted to the desired size.

[0087] In the corrugated tube 10, grommet 20 and annular member 30 thus configured, the thick-walled annular portion 31 constituting the annular member 30 is disposed in the small diameter portion 11, as shown in an enlarged view of a portion α in FIG. 5(a). Then, the corrugated tube 10 in which the thin-walled annular portion 32 constituting the annular member 30 is disposed in the large diameter portion 12 is inserted into the grommet 20 from the +X direction.

[0088] In addition, the small diameter portion 11 in the -X direction separated by one small diameter portion 11 from the small diameter portion 11 in which the thick-walled annular portion 31 of the annular member 30 is arranged is attached so as to fit into the +X direction side of the corrugated locking piece 23 that constitutes the grommet 20, and the grommet 20 is fitted onto the corrugated tube 10.

[0089] At this time, the outer diameter of the annular member 30 is formed to be larger than the inner diameter of the grommet 20, and the inner diameter of the annular member 30 is formed to be larger than the outer diameter of the corresponding portion of the small diameter portion 11 or the large diameter portion 12.

[0090] Therefore, the annular member 30 abuts against the outer peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20, fitting to fill the groove portion 13 of the corrugated tube 10 while biting into the inner peripheral surface of the grommet 20, thereby closely adhering to both. Furthermore, by the annular member 30 being in close contact with the corrugated tube 10, the gap occurring between the outer diameter of the corrugated tube 10 and the inner diameter of the grommet 20 is filled without leaving any gap.

[0091] Then, as shown in Figure 5(b), the assembly of the corrugated tube mounting structure 1 is completed by attaching a cable tie 40 to the band fixing portion 21 of the grommet 20 for the corrugated tube 10, grommet 20 and annular member 30 that are attached as shown in Figure 5(a).

[0092] When the corrugated wire mounting structure 1 configured in this manner is tightened with a cable tie 40, the inner circumferential surface of the portion of the grommet 20 corresponding to the band fixing portion 21 and the corrugated wire engaging portion 22 are reduced in diameter, as shown in FIG. 5(c).

[0093] Therefore, the corrugated engagement portion 22 can be securely fitted into the groove portion 13 while the radially inner side of the corrugated engagement portion 22 and the inner surface of the band fixing portion 21 are brought close to the outer surface of the corrugated tube 10, thereby improving the water-stopping performance.

[0094] In some cases, the corrugated tube mounting structure 1 is used with the corrugated tube 10 bent as a whole, as shown in FIG. 6(a). When the corrugated tube 10 is bent as a whole, the thick-walled annular portion 31 is disposed on the inside in the bending direction at the location where the annular member 30 is disposed so as to fit into the groove portion 13, as shown in Fig. 6(b). This suppresses deformation in the direction approaching the large diameter portion 12 constituting the groove portion 13 in which the thick-walled annular portion 31 is disposed.

[0095] Therefore, even if the corrugated tube 10 is bent overall for installation, deformation of the corrugated tube 10 in the portion where the annular member 30 is arranged can be restricted, and the outer peripheral surface of the annular member 30 can be prevented from separating from the inner peripheral surface of the grommet 20 as the corrugated tube 10 is bent.

[0096] The corrugated tube mounting structure 1 configured in this manner includes a corrugated tube 10 in which small diameter portions 11 and large diameter portions 12 are alternately formed along the longitudinal direction X, a grommet 20 fitted onto the corrugated tube 10, and an elastic annular member 30. The annular member 30 is disposed between the outer circumferential surface of the corrugated tube 10 and the inner circumferential surface of the grommet 20 and abuts against the outer circumferential surface and the inner circumferential surface.

[0097] This makes it possible to prevent water from entering the inside of the grommet 20 from between the corrugated tube 10 and the grommet 20, and also makes it possible to easily restore the water-stopping performance between the corrugated tube 10 and the grommet 20 in the corrugated tube mounting structure 1.

[0098] More specifically, the annular member 30 is provided so as to abut against the outer circumferential surface of the corrugated tube 10 and the inner circumferential surface of the grommet 20 , and is sandwiched between the corrugated tube 10 and the grommet 20 . Therefore, the annular member 30 adheres closely to the outer peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20 due to a repulsive force against the sandwiching pressure, and can reliably fill the gap between the corrugated tube 10 and the grommet 20. In other words, it is possible to prevent water from entering the inside of the grommet 20 from between the corrugated tube 10 and the grommet 20.

[0099] In addition, the annular member 30 is provided separately from the corrugated tube 10 and the grommet 20. Therefore, even if the deformation performance of the annular member 30 decreases due to the above-mentioned deterioration over time or damage, and sufficient water-stopping performance can no longer be obtained, the water-stopping performance can be easily restored by simply replacing the annular member 30, without replacing the corrugated tube 10 or the grommet 20 themselves. Furthermore, by forming the annular member 30 from a material different from that of the grommet 20 or by changing the shape thereof, it is possible to obtain a desired water-stopping performance.

[0100] Therefore, as described above, it is possible to prevent water from entering the inside of the grommet 20 from between the corrugated tube 10 and the grommet 20, and the water-stopping performance between the corrugated tube 10 and the grommet 20 in the corrugated tube mounting structure 1 can be easily restored.

[0101] In addition, since the annular member 30 on the outer periphery of the small diameter portion 11 of the corrugated tube 10 is disposed in the groove portion 13, movement of the annular member 30 in the longitudinal direction X is restricted. This prevents the annular member 30 from unintentionally falling off or becoming detached from the corrugated tube 10, which would result in insufficient water stopping performance being obtained.

[0102] Furthermore, the annular member 30 is deformed to fit into the groove portion 13 due to the pressure of being sandwiched between the corrugated tube 10 and the grommet 20. In other words, since the radially inner side of the annular member 30 is restricted by the small diameter portion 11 and the large diameter portion 12, the annular member 30, which deforms due to the pressure of being sandwiched between the corrugated tube 10 and the grommet 20, can be prevented from unintentionally deforming in a direction in which it is likely to deform.

[0103] Therefore, deformation of the annular member 30 in an unintended direction is prevented, and the pressure applied between the corrugated tube 10 and the grommet 20 is reliably applied to the annular member 30, ensuring close contact between the corrugated tube 10 and the grommet 20 and the annular member 30.

[0104] In addition, since the annular member 30 is disposed on the outer periphery of the small diameter portion 11, when an external force acts in the bending direction of the corrugated tube 10, the inner portion of the annular member 30 in the bending direction can suppress deformation of the large diameter portions 12 on both sides of the small diameter portion 11 in the longitudinal direction X.

[0105] Therefore, even if an external force acts on the corrugated tube 10, deformation of the portion of the corrugated tube 10 where the annular member 30 is arranged can be suppressed, and the annular member 30 can be prevented from separating from the inner surface of the grommet 20 as the corrugated tube 10 is bent.

[0106] That is, it is possible to prevent unintended deformation of the corrugated tube 10 at the location where the annular member 30 is arranged. Therefore, even if the corrugated tube 10 is bent overall into a desired shape, deformation of the corrugated tube 10 is suppressed at the location where the annular member 30 is arranged, and the annular member 30 can be maintained in intimate contact with the outer circumferential surface of the corrugated tube 10 and the inner circumferential surface of the grommet 20.

[0107] In this manner, by disposing the annular member 30 in the small diameter portion 11, it is possible to reliably apply pressure to the annular member 30. Furthermore, it is possible to reliably bring the annular member 30 into close contact with the outer circumferential surface of the corrugated tube 10 and the inner circumferential surface of the grommet 20, and it is possible to reliably prevent water from entering the inside of the grommet 20.

[0108] The annular member 30 also has a thick-walled annular portion 31 arranged in the small diameter portion 11 of the corrugated tube 10, and a thin-walled annular portion 32 extending from the thick-walled annular portion 31 in the longitudinal direction X to cover the adjacent large diameter portion 12. As a result, the outer peripheral surface of the large diameter portion 12, which protrudes radially outward of the corrugated tube 10 further than the small diameter portion 11, can press the thin annular portion 32 against the inner peripheral surface of the grommet 20 so that the thin annular portion 32 is in close contact with the inner peripheral surface of the grommet 20. Therefore, the gap between the outer peripheral surface of the large diameter portion 12 and the inner peripheral surface of the grommet 20 can be reliably filled by the thin annular portion 32.

[0109] Furthermore, the annular member 30 is deformed by the pressure of being sandwiched between the corrugated tube 10 and the grommet 20 . When the annular member 30 deforms, the thick annular portion 31 is restricted by the groove portion 13 , and the deformation of the radially outer portion protruding from the groove portion 13 is restricted by the thin annular portion 32 .

[0110] Therefore, even if pressure acts on the annular member 30 and causes it to deform, it is possible to prevent the thick-walled annular portion 31 from unintentionally deforming in a direction in which it is more likely to deform, and pressure can be more reliably applied to the thick-walled annular portion 31.

[0111] Similarly, when the annular member 30 is deformed by pressure, the thin annular portion 32 is restricted on one side in the longitudinal direction X by the thick annular portion 31, and deformation of the thin annular portion 32 in an unintended direction can be prevented. Therefore, pressure can be applied to the thin annular portion 32 more reliably.

[0112] Therefore, pressure can be applied to the annular member 30 more reliably, the corrugated tube 10 and the grommet 20 can be more reliably brought into close contact with each other, and water can be more reliably prevented from entering the inside of the grommet 20.

[0113] The annular member 30 is disposed on the outer periphery of the large diameter portion 12 of the corrugated tube 10. In other words, the annular member 30 is disposed on the outer periphery of the large diameter portion 12 which is closer to the inner periphery of the grommet 20 than the small diameter portion 11.

[0114] Therefore, the annular member 30 can be reliably brought into close contact with the inner circumferential surface of the grommet 20 and the outer circumferential surface of the large diameter portion 12. Therefore, water can be reliably prevented from entering the inside of the grommet 20.

[0115] Further, the inner peripheral surface of the grommet 20 is provided with a corrugated engagement portion 22 that protrudes radially inward, and the corrugated engagement portion 22 is disposed in the small diameter portion 11 of the corrugated tube 10. This makes it possible to prevent deterioration of the water-stopping performance due to the annular member 30, and further to improve the water-stopping performance.

[0116] More specifically, the annular member 30 is in close contact with the outer circumferential surface of the corrugated tube 10 and the inner circumferential surface of the grommet 20. Therefore, when the corrugated tube 10 and the grommet 20 move relatively in the longitudinal direction X, there is a risk that the annular member 30 will move in the longitudinal direction X due to friction.

[0117] When moved in the longitudinal direction X in this manner, the annular member 30 becomes exposed from the grommet 20 and does not come into sufficient contact with the inner peripheral surface of the grommet 20, resulting in a decrease in waterproof performance. In response to this, the corrugated engaging portion 22 is disposed in the small diameter portion 11, i.e., the corrugated engaging portion 22 is fitted into the groove portion 13. This makes it possible to restrict the relative movement between the corrugated tube 10 and the grommet 20 in the longitudinal direction X, thereby preventing the annular member 30 from being exposed from the grommet 20 and preventing a decrease in water-stopping performance.

[0118] Furthermore, since the corrugated engagement portion 22 is fitted into the groove portion 13 and is positioned in the gap between the corrugated tube 10 and the grommet 20, the water-stopping effect is not only achieved by the annular member 30 but also by the corrugated engagement portion 22, thereby improving the water-stopping performance.

[0119] In addition, the annular member 30 is disposed on the +X direction side of the grommet 20 relative to the corrugated engagement portion 22, and water is stopped by the annular member 30 prior to the corrugated engagement portion 22. However, water that has infiltrated beyond the annular member 30 can be stopped by the corrugated engagement portion 22. Therefore, the annular member 30 , which comes into contact with more water, is more susceptible to deterioration and damage due to contact with water and water pressure than the corrugated engagement portion 22 .

[0120] In this way, by arranging the easily replaceable annular member 30 on the +X direction side, deterioration and damage over time of the corrugated engagement portion 22, which cannot be easily replaced, can be suppressed, and the water-stopping performance can be restored for a longer period of time.

[0121] Furthermore, by positioning the annular member 30 on the +X direction side of the corrugated engagement portion 22, the annular member 30 can be replaced without passing through the corrugated engagement portion 22, which protrudes radially inward, i.e., has a smaller diameter than other portions, making it easier to replace the annular member 30.

[0122] In addition, a cable tie 40 is provided which is fixed to the outer periphery of the grommet 20, and a band fixing portion 21 in which the cable tie 40 fits is provided on the outer periphery of the grommet 20 including the radially outer region of the corrugated engagement portion 22. As a result, by tightening the cable tie 40, unintended expansion of the portion of the grommet 20 including the area in which the corrugated engagement portion 22 is provided can be prevented, and the corrugated engagement portion 22 can be prevented from accidentally coming off the corrugated tube 10.

[0123] The corrugated tube engaging portion 22 can be securely fitted into the groove portion 13, and the relative movement of the corrugated tube 10 and the grommet 20 along the longitudinal direction X can be securely restricted, thereby preventing the corrugated tube 10 from falling off the grommet 20.

[0124] Furthermore, even if the corrugated tube 10 is bent overall into a desired shape, it is possible to prevent the bent corrugated tube 10 from coming into contact with and deforming the grommet 20, and it is possible to prevent the corrugated tube 10 from unintentionally falling out of the deformed grommet 20.

[0125] Furthermore, by fastening the grommet 20 with the cable tie 40, the diameter of the radially inner region of the band fixing portion 21 in the grommet 20 is reduced. Therefore, the corrugated engagement portion 22 can be pushed toward the small diameter portion 11, and the engagement between the corrugated engagement portion 22 and the small diameter portion 11 can be prevented from accidentally coming loose.

[0126] Therefore, the corrugated engagement portion 22 can be securely fitted into the groove portion 13, the relative movement between the corrugated tube 10 and the grommet 20 along the longitudinal direction X can be more reliably restricted, and the annular member 30 can be more reliably prevented from being exposed from the grommet 20, thereby more reliably preventing a decrease in water-stopping performance.

[0127] Furthermore, by pushing the corrugated engagement portion 22 radially inward, the corrugated engagement portion 22 and the small diameter portion 11 come into close contact with each other, and the gap between the corrugated tube 10 and the grommet 20 can be filled by the corrugated engagement portion 22, thereby further improving the water-stopping performance.

[0128] In addition, a cable tie 40 is provided to be fixed to the outer periphery of the grommet 20, and a band fixing portion 21 is provided on the outer periphery of the grommet 20 on the -X direction side of the radially outer region of the annular member 30, into which the cable tie 40 fits. This makes it possible to prevent the grommet 20 from unintentionally expanding, and to prevent the corrugated tube 10 from falling off the grommet 20.

[0129] Furthermore, even if the corrugated tube 10 is bent overall into a desired shape, the bending of the corrugated tube 10 can be prevented from deforming the grommet 20, and the corrugated tube 10 can be prevented from falling out of the deformed grommet 20 unintentionally.

[0130] In addition, by tightening the grommet 20 using the cable tie 40, the diameter of the radially inner region of the band fixing portion 21 in the grommet 20 is reduced, and the outer peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20 are brought closer together, thereby further improving the water-stopping performance. That is, even if water passes over the annular member 30 and seeps into the inside of the grommet 20, the water can be stopped at the portion fastened by the cable tie 40, thereby further improving the water stopping performance.

[0131] Furthermore, since the band fixing portion 21 is provided on the outer peripheral surface of the grommet 20 separated from the annular member 30 by one small diameter portion 11, the inner peripheral surface of the grommet 20 and the annular member 30 can be more reliably adhered to each other, thereby further preventing a decrease in water-stopping performance.

[0132] More specifically, the portion of the grommet 20 corresponding to the band fixing portion 21 is deformed radially inward by fastening the cable tie 40. The vicinity of the corresponding portion of the band fixing portion 21 is also deformed in accordance with the deformation of the corresponding portion of the band fixing portion 21. At this time, the vicinity of the corresponding portion of the band fixing portion 21 is deformed, but the degree of deformation of the grommet 20 decreases as the distance from the band fixing portion 21 increases.

[0133] Therefore, when the annular member 30 is placed in the small diameter portion 11 near the corresponding portion of the band fixing portion 21, depending on the degree of deformation near the corresponding portion of the band fixing portion 21, a gap may occur between the inner surface of the grommet 20 and the annular member 30.

[0134] In contrast, by locating the band fixing portion 21 away from the annular member 30 by one small diameter portion 11, the effect of deformation of the grommet 20 due to tightening of the band can be reduced at the location where the annular portion of the grommet 20 is located.

[0135] This makes it possible to suppress deformation of the portion of the grommet 20 where the annular member 30 is disposed due to fastening of the cable tie 40, and to prevent a gap from being formed between the inner peripheral surface of the grommet 20 and the annular member 30. In other words, a tight contact state between the inner peripheral surface of the grommet 20 and the annular member 30 can be reliably maintained. In this way, the inner peripheral surface of the grommet 20 and the annular member 30 can be brought into closer contact with each other more reliably, and deterioration of the waterproofing performance can be further prevented.

[0136] Furthermore, since the corrugated engagement portion 22 is not positioned on the +X direction side of the band fixing portion 21, the corrugated engagement portion 22 is pushed radially inward to come into close contact with the small diameter portion 11, thereby filling the gap between the corrugated tube 10 and the grommet 20. Therefore, the corrugated engagement portion 22 is less affected by the tightening of the cable tie 40 fixed by the band fixing portion 21, and is able to exhibit water-stopping properties.

[0137] In the configuration of the present invention and the correspondence with the above-mentioned embodiment, The corrugated sheet mounting structure of the present invention corresponds to the corrugated sheet mounting structure 1 of the embodiment, Similarly, Corrugated tubes are compatible with corrugated tube 10. The small diameter portion corresponds to the small diameter portion 11, The large diameter portion corresponds to the large diameter portion 12, The grommet is compatible with grommet 20. The band fixing part corresponds to the band fixing part 21, The corrugated locking portion corresponds to the corrugated locking portion 22, The annular member corresponds to the annular member 30, The thick-walled annular portion corresponds to the thick-walled annular portion 31, The thin-walled annular portion corresponds to the thin-walled annular portion 32, The corrugated insertion end corresponds to the +X direction side, The opposite side of the corrugated insertion end corresponds to the -X direction side, The band corresponds to the cable tie 40, The present invention is not limited to the configurations of the above-described embodiments, and many other embodiments can be obtained.

[0138] For example, in this embodiment, the cable tie 40 is used to tighten the outer periphery of the grommet 20 to reduce the diameter of the radially inner region of the band fixing portion 21 of the grommet 20, but it is sufficient that the cable tie 40 adheres closely to the outer periphery of the grommet 20 and suppresses the expansion of the diameter of the grommet 20. Specifically, a rubber band may be attached to the band fixing portion 21 of the grommet 20.

[0139] In addition, in this embodiment, the annular member 30 has the thick annular portion 31 only on the +X direction side of the thin annular portion 32, but as shown in FIG. 7, the thick annular portion 31 may be provided on both sides of the thin annular portion 32 in the longitudinal direction X.

[0140] 7A and 7B are explanatory diagrams of an annular member 30x according to another embodiment. In detail, FIG. 7A shows a schematic cross-sectional view of the annular member 30x, and FIG. 7B shows a schematic cross-sectional view of a corrugated mounting structure 1x to which the annular member 30x is attached.

[0141] In addition, since each configuration of the annular member 30x and the corrugated tube mounting structure 1x shown in FIG. 7 is similar to each configuration of the annular member 30 and the corrugated tube mounting structure 1 described above, the same reference numerals are used and the description thereof is omitted.

[0142] As shown in FIG. 7(a), the annular member 30x is configured in a circular ring shape that is concave inwardly in cross section. The annular member 30x is integrally formed of a thin annular portion 32 covering the large diameter portion 12 of the corrugated tube 10 and thick annular portions 31 provided on both sides of the thin annular portion 32 in the longitudinal direction X.

[0143] As shown in FIG. 7(b), the annular member 30x configured in this manner has a thin-walled annular portion 32 arranged on the outer periphery of the large diameter portion 12 of the corrugated tube 10, and thick-walled annular portions 31 arranged on both sides of the large diameter portion 12 in the longitudinal direction X.

[0144] The corrugated tube 10 with the annular member 30x attached thereto is fitted over the corrugated tube engaging piece 23 of the grommet 20 so that the corrugated tube engaging piece 23 fits into the grommet 20, and a cable tie 40 is attached to the grommet 20, thereby forming the corrugated tube mounting structure 1x.

[0145] The annular member 30x of the corrugated tube mounting structure 1x configured in this manner has a thin-walled annular portion 32 that covers the large diameter portion 12 of the corrugated tube 10, and a thick-walled annular portion 31 that extends from the thin-walled annular portion 32 on both sides in the longitudinal direction X and is positioned in the adjacent small diameter portion 11. Therefore, by sandwiching the large diameter portion 12 covered by the thin annular portion 32 from both sides in the longitudinal direction X by the thick annular portion 31, it is possible to prevent the thin annular portion 32 from unintentionally coming off the large diameter portion 12 inadvertently.

[0146] Furthermore, deformation of the thin-walled annular portion 32 due to pressure sandwiched between the corrugated tube 10 and the grommet 20 is restricted by the thick-walled annular portions 31 extending from both sides of the thin-walled annular portion 32 in the longitudinal direction X. This prevents the thin-walled annular portion 32 from escaping due to the applied pressure, and ensures that pressure is applied to the thin-walled annular portion 32 supported by the thick-walled annular portions 31. Therefore, the thin-walled annular portion 32 can be more reliably brought into close contact with the corrugated tube 10 and the grommet 20, and water infiltration into the inside of the grommet 20 can be more reliably prevented.

[0147] In the above description, when the corrugated tube 10 and the grommet 20 are fitted together, the annular member 30 arranged on the small diameter portion 11 of the corrugated tube 10 abuts against the smooth inner surface of the grommet 20. However, a recess (not shown) that is more concave than other portions may be formed along the circumferential direction at the contact point of the annular member 30 on the inner surface of the grommet 20.

[0148] As described above, by providing a circumferentially continuous recess at the contact point of the annular member 30 on the inner surface of the grommet 20, the annular member 30 comes into contact with the recess on the inner surface of the grommet 20 when the corrugated tube 10 and the grommet 20 are fitted together. Note that by providing a recess against which the annular member 30 comes into contact, the space at the boundary between the corrugated tube 10 and the grommet 20 is expanded. This makes it possible to reduce the water pressure acting on the annular member 30, and to better prevent water from entering the inside. [Explanation of symbols]

[0149] 1. Corrugated mounting structure 10. Corrugated tube 11...Small diameter section 12 Large diameter section 13 Groove 20 Grommet 21 Band fixing part 22....Latching portion fitting groove 23 Corrugated locking part 24...Corrugated locking piece 30... Annular member 31 Thick-walled annular section 32 Thin-walled annular section 40 Cable tie 41... Buckle 42. Band section 43 Band locking hole 421...Locked piece 431...Band locking piece WH···Wire harness X: Longitudinal direction

Claims

1. a corrugated tube in which small diameter portions and large diameter portions are alternately formed along a longitudinal direction; a grommet fitted onto an end of the corrugated tube; and an elastic annular member, The annular member is disposed between an inner peripheral surface of the grommet and an outer peripheral surface of the corrugated tube in an externally fitted state, and is in contact with the outer peripheral surface and the inner peripheral surface. the annular member is disposed on an outer periphery of the small diameter portion of the corrugated tube, A recess is formed along the circumferential direction on the inner surface of the grommet at a portion where the annular member arranged on the outer periphery of the small diameter portion abuts, the recess being more recessed than other portions. Corrugated mounting structure.

2. The annular member has a thick-walled annular portion disposed in the small diameter portion of the corrugated tube, and a thin-walled annular portion extending in the longitudinal direction from the thick-walled annular portion to cover the adjacent large diameter portion.

2. The corrugated mounting structure according to claim 1.

3. The annular member is disposed on the outer periphery of the large diameter portion of the corrugated tube.

2. The corrugated mounting structure according to claim 1.

4. The annular member has a thin-walled annular portion covering the large diameter portion of the corrugated tube, and a thick-walled annular portion extending from the thin-walled annular portion on both sides in the longitudinal direction and disposed on the adjacent small diameter portion.

4. The corrugated mounting structure according to claim 3.

5. A corrugated engagement portion is provided on the inner circumferential surface of the grommet, the corrugated engagement portion protruding radially inward, The corrugated tube engaging portion is disposed on the small diameter portion of the corrugated tube. The corrugated mounting structure according to any one of claims 1 to 4.

6. The annular member is disposed closer to the corrugated insertion end of the grommet than the corrugated engagement portion.

6. The corrugated mounting structure according to claim 5.

7. A band is provided which is fixed to an outer periphery of the grommet, A band fixing portion in which the band fits is provided on the outer peripheral surface of the grommet including the radially outer region of the corrugated engagement portion. The corrugated mounting structure according to claim 5 or 6.

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