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, which is a structure for mounting, for example, a corrugated tube and a grommet. [Background technology]

[0002] For example, when routing a high-voltage electric wire, a corrugated tube through which the high-voltage electric wire is inserted and a grommet fitted onto the end of the corrugated tube may be used. Furthermore, the corrugated tube and the grommet are tightly fitted together at the outer fitting portion thereof, thereby preventing water from seeping in between the corrugated tube and the grommet and into the interior of the assembled corrugated tube and grommet.

[0003] For example, the grommet described in Patent Document 1 has an inner 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 closely attached to each other at the fitting portion, but the inner lip also engages with the small diameter portion of the corrugated tube, which is formed into a bellows-like cylindrical shape with alternating small diameter portions and large diameter portions.

[0004] As described above, the inner lip engages with the small diameter portion of the corrugated tube, which lengthens the path for water to seep in between the outer surface of the corrugated tube and the inner surface of the grommet in the fitted portion, thereby more effectively preventing water from seeping in from between the grommet and the corrugated tube in the fitted portion. However, in the grommet described in Patent Document 1, if the deformation performance of the inner lip deteriorates due to aging or damage, and the water-stopping performance from the space between the grommet and the corrugated tube in the outer fitting portion to the inside deteriorates, the grommet itself must be replaced, and the water-stopping performance cannot be easily restored. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-42023 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of this invention is to provide a corrugated tube mounting structure that can prevent water from seeping into 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 deteriorates. [Means for solving the problem]

[0007] The present invention provides a corrugated tube having small diameter portions and large diameter portions alternately formed along the longitudinal direction, a grommet fitted onto an end of the corrugated tube, and an elastic annular member, the annular member being disposed between the inner peripheral surface of the grommet in the fitted state and the outer peripheral surface of the corrugated tube, and abutting the outer peripheral surface and the inner peripheral surface. The grommet has a band fixed to an outer periphery thereof, and a band fixing portion is provided on the outer periphery of the grommet on the side opposite to the corrugated insert end side from the radially outer region of the annular member, where the band fits. It is characterized by a 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. The annular member is preferably formed to have higher rigidity than the grommet.

[0009] This invention makes it possible to prevent water from seeping into 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 deteriorates.

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

[0011] Therefore, the annular member adheres tightly to the outer circumferential surface of the corrugated tube and the inner circumferential surface of the grommet due to a repulsive force against the pressure applied thereto, thereby reliably filling the gap between the corrugated tube and the grommet. In other words, it is possible to prevent water from entering the interior of the corrugated tube through the gap between the corrugated tube and the grommet.

[0012] Furthermore, since the annular member is provided separately from the corrugated tube and the grommet, even if the deformation ability 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 watertightness is no longer obtained, watertightness can be easily restored by simply replacing the annular member, without having to replace the corrugated tube or the grommet themselves. Furthermore, the annular member can be made of a material different from that of the grommet or by changing its shape, thereby achieving the desired water-stopping performance.

[0013] Therefore, as described above, it is possible to prevent water from seeping into 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] The grommet further includes a band that is fixed to the outer periphery of the grommet, and a band fixing portion is provided on the outer periphery of the grommet on the side opposite the corrugated insertion end side from the radially outer region of the annular member, where the band fits.

[0015] Therefore, the grommet can be prevented from unintentionally expanding, and the corrugated tube can be prevented from falling out of the grommet. Furthermore, even if the entire corrugated tube is bent into a desired shape, for example, 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.

[0016] Furthermore, by tightening the grommet using the band, the diameter of the inner region of the band fixing portion of the grommet is reduced, bringing the outer surface of the corrugated tube and the inner surface of the grommet closer together, thereby further improving the water-stopping performance. That is, even if water penetrates past the annular member and into the interior, the water can be stopped at the portion fastened by the band, thereby further improving the water stopping performance.

[0017] As an aspect of the present invention, the annular member may be disposed on an outer periphery of the small diameter portion of the corrugated tube. According to this invention, 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, restricting longitudinal movement of the annular member, thereby preventing the annular member from unintentionally falling off or becoming detached from the corrugated tube and thereby preventing a loss of sufficient watertight performance.

[0018] Furthermore, the annular member deforms due to 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 inner diameter of the annular member is restricted by the small diameter portion and the large diameter portion, the annular member, which deforms due to the clamping pressure between the corrugated tube and the grommet, can be prevented from unintentionally deforming in a direction in which it is more likely to deform.

[0019] Therefore, deformation of the annular member in an unintended direction is prevented, the clamping pressure between the corrugated tube and the grommet is reliably applied to the annular member, and the corrugated tube and the grommet can be reliably brought into close contact with the annular member.

[0020] Furthermore, 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 both sides of the small diameter portion in the longitudinal direction from approaching each other, thereby suppressing deformation of the large diameter portion.

[0021] 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.

[0022] That is, 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 at the location where the annular member is disposed is suppressed, and the annular member can be maintained in tight contact with the outer circumferential surface of the corrugated tube and the inner circumferential surface of the grommet.

[0023] In this way, by placing 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 brought into close contact with the outer surface of the corrugated tube and the inner surface of the grommet, thereby reliably preventing water from entering the interior.

[0024] As another aspect of the present invention, a recess that is more recessed than other portions may be formed along the circumferential direction on the inner surface of the grommet at a location where the annular member arranged on the outer periphery of the small diameter portion abuts. According to this invention, when the corrugated tube and the grommet are fitted together, the annular member abuts against a recess on the inner surface of the grommet. Furthermore, by providing a recess against which the annular member abuts, the space at the boundary between the corrugated tube and the grommet is enlarged. This reduces the water pressure acting on the annular member, thereby more effectively preventing water from entering the interior.

[0025] As another 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 from the thick-walled annular portion in the longitudinal direction to cover the adjacent large diameter portion.

[0026] 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 close contact with it. Therefore, the gap between the outer peripheral surface of the large diameter portion and the inner peripheral surface of the grommet can be reliably filled by the thin annular portion.

[0027] 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.

[0028] Therefore, even if pressure acts on the annular member and causes it to deform, it is possible to prevent the thick-walled annular portion from unintentionally deforming in a direction in which it is more likely to deform. Therefore, it is possible to prevent the thick-walled annular portion from deforming in an unintended direction, and it is possible to more reliably apply pressure to the thick-walled annular portion.

[0029] 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, preventing the thin annular portion from deforming in an unintended direction. Thus, pressure can be applied more reliably to the thin annular portion.

[0030] Therefore, pressure can be applied more reliably to the annular member, the corrugated tube and the grommet can be more reliably brought into close contact with each other, and water can be more reliably prevented from entering the interior.

[0031] As another 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, which is closer to the inner periphery of the grommet than the small diameter portion, the annular member can be reliably fitted to the inner periphery of the grommet and the outer periphery of the large diameter portion, thereby reliably preventing water from entering the interior.

[0032] In another aspect of the present invention, the annular member may have a thin-walled annular portion that covers the large diameter portion of the corrugated tube, and a thick-walled annular portion that extends from the thin-walled annular portion on both sides in the longitudinal direction and is positioned on the adjacent small diameter portion.

[0033] According to this invention, the large diameter portion covered by the thin-walled annular portion is sandwiched between the thick-walled annular portion on both sides in the longitudinal direction, thereby preventing the thin-walled annular portion from accidentally coming off the large diameter portion unintentionally.

[0034] 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, thereby preventing the thin-walled annular portion from escaping due to the applied pressure and ensuring that pressure is 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.

[0035] As another 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.

[0036] 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. Specifically, as described above, the annular member is in close contact with the outer peripheral surface of the corrugated tube and the inner peripheral surface of the grommet. Therefore, when the corrugated tube and the grommet move relative to each other in the longitudinal direction, friction causes the annular member to move in the longitudinal direction, potentially causing the annular member to become exposed from the grommet. If the annular member becomes exposed from the grommet, it will not be able to fully abut against the inner peripheral surface of the grommet, resulting in a decrease in waterproofing performance.

[0037] 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 watertight performance.

[0038] 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 water-stopping performance.

[0039] In another aspect of the present invention, the annular member may be disposed closer to the corrugated inserting end of the grommet than the corrugated engaging portion. The corrugated tube insertion end side of the grommet refers to the side of the grommet into which the corrugated tube is inserted.

[0040] According to this 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.

[0041] In this way, by placing 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 over a longer period of time.

[0042] 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 parts, making it easier to replace the annular member.

[0043] 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 on the outer periphery of the grommet, including the radially outer region of the corrugated engagement portion, into which the band fits.

[0044] The band may be a cable tie, a rubber band, or the like, and may be configured to fit tightly around the outer periphery of the grommet and prevent the grommet from expanding.

[0045] According to this invention, by tightening the band, unintentional expansion of the part of the grommet including the area where the corrugated engagement portion is provided can be prevented, and the corrugated engagement portion can be prevented from accidentally coming off the corrugated tube.

[0046] The corrugated tube engaging portion can be securely fitted into the groove, thereby reliably restricting relative movement between the corrugated tube and the grommet along the longitudinal direction, and preventing the corrugated tube from falling off the grommet.

[0047] Furthermore, even if the entire corrugated tube is bent into a desired shape, the bent corrugated tube can be prevented from coming into contact with the grommet and deforming it, and the corrugated tube can be prevented from falling out of the unintentionally deformed grommet.

[0048] 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 locking portion to be pushed toward the small diameter portion, thereby preventing the engagement between the corrugated locking portion and the small diameter portion from accidentally coming loose.

[0049] Therefore, the corrugated engagement portion can be securely fitted into the above-mentioned groove, more reliably restricting the relative movement between the corrugated tube and the grommet along the longitudinal direction, and more reliably preventing the annular member from being exposed from the grommet, thereby more reliably preventing a decrease in water-stopping performance.

[0050] Then, by pushing the corrugated locking portion inward in the diameter, the corrugated locking portion and the small diameter portion come into close contact with each other, and the gap between the corrugated tube and the grommet can be filled by the corrugated locking portion, thereby further improving water-stopping performance.

[0051] As another aspect of the present invention, the band fixing portion may be provided on the outer peripheral 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 fixing portion is deformed radially inward, and the vicinity of the portion that corresponds to the band fixing portion is also deformed in accordance with the deformation of the portion that corresponds to the band fixing 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 placed 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 contrast, by arranging the band fixing portion at a distance of one or more small diameter portions from the annular member, 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 can suppress deformation of the portion of the grommet where the annular member is disposed due to tightening of the band, and can prevent a gap from being formed between the inner peripheral surface of the grommet and the annular member, thereby reliably maintaining 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] In another aspect of the present invention, the corrugated sheet engaging portion may not be disposed on the corrugated sheet inserting end side of the band fixing portion. With this invention, the corrugated engaging portion, which can be pushed inward radially 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 therefore exhibit watertight properties. [Effects of the Invention]

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

[0058] [Figure 1] FIG. 2 is an external perspective view showing the appearance of the corrugated tube mounting structure. [Figure 2] FIG. 2 is an exploded perspective view of the corrugated wiring mounting structure with the cable ties removed. [Figure 3] An explanatory diagram of each part of the corrugated mounting structure with the cable ties removed. [Figure 4] An explanatory diagram of cable ties. [Figure 5] FIG. 2 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. 10 is an explanatory diagram of an annular member according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0059] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 shows an external perspective view of the corrugated tube mounting structure 1, and Fig. 2 shows an exploded perspective view of the corrugated tube mounting structure 1 with the 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, grommet 20, and 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 cable tie 40. More specifically, Fig. 4(a) shows a schematic perspective view of a portion of cable tie 40, and Fig. 4(b) shows a schematic cross-sectional view of cable tie 40 with band portion 42 inserted through buckle 41.

[0062] Figure 5 shows an explanatory diagram illustrating how to assemble the corrugated tube mounting structure 1. More specifically, Figure 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. Figure 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 shown in Figure 5(a), and Figure 5(c) shows an enlarged view of the α portion in Figure 5(b).

[0063] Figure 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, Figure 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 Figure 6(b) shows an enlarged view of the β portion in Figure 6(a).

[0064] 1, the direction along the longitudinal direction of the corrugated tube 10 is defined as the 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 placed relative to the grommet 20, is defined as the +X direction, and the opposite side is defined as the -X direction.

[0065] As shown in FIGS. 1 to 3, the corrugated tube mounting structure 1 is formed in a cylindrical shape so that a wire harness WH to be arranged in a vehicle (not shown) can be inserted therein. 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 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, each having an outer circumferential surface recessed radially inward, and large diameter sections 12, each having an outer circumferential surface protruding radially outward, 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 bendable bellows-like 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 of the small diameter sections 11 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 length of this groove portion 13 along the longitudinal direction X of the small diameter portion 11 is shorter than the length of the large diameter portion 12 along the longitudinal direction X, so that the groove portion 13 is formed to have a generally trapezoidal cross section that narrows as it approaches the radially inward side 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, or 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 an approximately band-like shape around the entire circumference to accommodate the cable tie 40, and the inner peripheral surface of the grommet 20 is provided with a corrugated locking 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 positioned at a distance slightly longer than twice the total length of the small diameter portion 11 and the large diameter portion 12 in the longitudinal direction X from the +X-direction end of the grommet 20 (see Figure 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 binding band 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 portion 21, and is formed so that its length along the longitudinal direction X is longer than the length along the longitudinal direction X of the band fixing portion 21. The band fixing portion 21 formed in this manner is configured so that a binding band 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 around 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 positioned 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, and 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 locking pieces 23 is formed so as to narrow as it goes radially inward, and is formed in the shape of a rib 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 tube engaging 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 along 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 Figure 3(c), the annular member 30 is integrally formed of a thick-walled annular portion 31 that is placed in the small diameter portion 11 of the corrugated tube 10 and a thin-walled annular portion 32 that is placed in the small diameter portion 11, and the thick-walled annular portion 31 is placed 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 longer than the thick-walled annular portion 31.

[0080] In this way, the annular member 30 is formed with an outer diameter slightly larger than the inner diameter of the grommet 20, and is formed in a substantially circular ring shape with an inner diameter that tapers off in one 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, thereby adhering closely to the outer surface of the corrugated tube 10 and 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-like band portion 42 extending from the buckle 41. The buckle 41 is formed in a rectangular parallelepiped shape with a length in the longitudinal direction X that is 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 has a band locking piece 431 on the side that abuts against the inner surface of the band portion 42 when 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 of the band portion 42 and the tip end in a triangular cross section that is approximately perpendicular to the inner surface of the band portion 42.

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

[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. As a result, the base end surface of the locked piece 421 in the insertion direction comes into contact with the tip end surface of the band locking piece 431, thereby locking the band portion 42, which has been inserted into the band locking hole 43, and preventing it from accidentally coming off the buckle 41.

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

[0087] In the corrugated tube 10, grommet 20 and annular member 30 configured as above, the thick-walled annular portion 31 constituting the annular member 30 is disposed in the small diameter portion 11, as shown in the enlarged view of the α portion 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 from the small diameter portion 11 in which the thick annular portion 31 of the annular member 30 is arranged is attached so that it fits 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 larger than the inner diameter of the grommet 20, and the inner diameter of the annular member 30 is formed 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 surface of the corrugated tube 10 and the inner surface of the grommet 20, fitting to fill the groove portion 13 of the corrugated tube 10, and biting into the inner surface of the grommet 20, thereby adhering closely to both. The annular member 30 is tightly fitted to fill the gap that occurs between the outer diameter of the corrugated tube 10 and the inner diameter of the grommet 20 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 tube 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 tube engaging portion 22 are reduced in diameter, as shown in Figure 5(c).

[0093] Therefore, the water-stopping performance can be improved by securely fitting the corrugated engagement portion 22 into the groove portion 13 while bringing the inner diameter of the corrugated engagement portion 22 and the inner surface of the band fixing portion 21 close to the outer surface of the corrugated tube 10.

[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 inner side 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 in which the large diameter portion 12 constituting the groove portion 13 in which the thick-walled annular portion 31 is disposed approaches the groove portion 13.

[0095] Therefore, even if the corrugated tube 10 is bent overall when it is routed, deformation of the corrugated tube 10 in the portion where the annular member 30 is arranged can be restricted, and the outer surface of the annular member 30 can be prevented from separating from the inner 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 having small diameter portions 11 and large diameter portions 12 formed alternately 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 peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20 and abuts against the outer peripheral surface and the inner peripheral surface.

[0097] This makes it possible to prevent water from seeping into 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 peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20 , and is sandwiched between the corrugated tube 10 and the grommet 20 . Therefore, the annular member 30 adheres 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 sandwiched 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 seeping into the inside of the grommet 20 from between the corrugated tube 10 and the grommet 20.

[0099] Furthermore, 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, 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 30, without having to replace 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, it is possible to obtain the 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 it is possible to easily restore the water-stopping performance between the corrugated tube 10 and the grommet 20 in the corrugated tube mounting structure 1.

[0101] Furthermore, because the annular member 30 is disposed in the groove portion 13 on the outer periphery of the small diameter portion 11 of the corrugated tube 10, 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 watertight 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 inner diameter of the annular member 30 is restricted by the small diameter portion 11 and the large diameter portion 12, the annular member 30, which is deformed 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 more likely to deform.

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

[0104] Furthermore, since the annular member 30 is arranged 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 part 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 close contact with the outer peripheral surface of the corrugated tube 10 and the inner peripheral surface of the grommet 20.

[0107] In this way, by disposing the annular member 30 in the small diameter portion 11, pressure can be reliably applied to the annular member 30. Furthermore, the annular member 30 can be reliably brought into close contact with the outer circumferential surface of the corrugated tube 10 and the inner circumferential surface of the grommet 20, thereby reliably preventing water from entering the inside of the grommet 20.

[0108] The annular member 30 also has a thick-walled annular portion 31 that is arranged in the small diameter portion 11 of the corrugated tube 10, and a thin-walled annular portion 32 that extends from the thick-walled annular portion 31 in the longitudinal direction X and covers 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-walled annular portion 32 so that it 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-walled 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, preventing the thin annular portion 32 from deforming in an unintended direction. 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. That is, the annular member 30 is disposed on the outer periphery of the large diameter portion 12, which is closer to the inner circumferential surface 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 peripheral surface of the grommet 20 and the outer peripheral surface of the large diameter portion 12. Therefore, water can be reliably prevented from entering the inside of the grommet 20.

[0115] Additionally, a corrugated engagement portion 22 that protrudes radially inward is provided on the inner peripheral surface of the grommet 20, 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 a decrease in the water-stopping performance of the annular member 30, and further improve the water-stopping performance.

[0116] More specifically, the annular member 30 is in close contact with the outer peripheral surface of the corrugated tube 10 and the inner peripheral 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 follow and move in the longitudinal direction X due to friction.

[0117] When the annular member 30 moves in the longitudinal direction X in this way, it 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 waterproofing performance. In response to this, the corrugated tube engaging portion 22 is disposed in the small diameter portion 11, i.e., the corrugated tube engaging portion 22 is fitted into the groove portion 13. This restricts relative movement between the corrugated tube 10 and the grommet 20 in the longitudinal direction X, prevents the annular member 30 from being exposed from the grommet 20, and prevents a decrease in watertight performance.

[0118] Furthermore, since the corrugated locking 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 not only of the annular member 30 but also of the corrugated locking portion 22 is added, thereby improving the water-stopping performance.

[0119] Furthermore, the annular member 30 is disposed closer to the +X direction of the grommet 20 than the corrugated locking portion 22, and water is stopped by the annular member 30 before the corrugated locking portion 22. However, water that penetrates beyond the annular member 30 can be stopped by the corrugated locking portion 22. Therefore, the annular member 30 , which comes into contact with more water, is more likely to be deteriorated or damaged by contact with water or water pressure than the corrugated engagement portion 22 .

[0120] In this way, by placing the easily replaceable annular member 30 on the +X direction side, deterioration over time and damage to the corrugated engaging portion 22, which cannot be easily replaced, can be suppressed, and the water-stopping performance can be restored and the product can be used 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 parts, making it easier to replace the annular member 30.

[0122] 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 including the radially outer region of the corrugated engagement portion 22 to fit the cable tie 40. As a result, by tightening the cable tie 40, unintentional expansion of the part of the grommet 20 including the area where 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 reliably 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 reliably restricted, thereby preventing the corrugated tube 10 from slipping 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 the grommet 20 and deforming the grommet 20, and it is possible to prevent the corrugated tube 10 from unintentionally falling off 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. This allows the corrugated locking portion 22 to be pushed toward the small diameter portion 11, preventing the engagement between the corrugated locking portion 22 and the small diameter portion 11 from accidentally coming loose.

[0126] Therefore, the corrugated engaging portion 22 can be securely fitted into the groove portion 13, the relative movement of 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, and the deterioration of the water-stopping performance can be more reliably prevented.

[0127] Then, by pushing the corrugated engagement portion 22 inward in the diameter, 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 that is fixed to the outer periphery of the grommet 20, and a band fixing portion 21 that fits the cable tie 40 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. This prevents the grommet 20 from unintentionally expanding, and prevents 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 grommet 20 can be prevented from being deformed by the bending of the corrugated tube 10, and the corrugated tube 10 can be prevented from falling off the deformed grommet 20 unintentionally.

[0130] In addition, by tightening the grommet 20 using the cable tie 40, the diameter of the inner radial area 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, further improving the water-stopping performance. That is, even if water penetrates past the annular member 30 into the inside of the grommet 20, the water can be stopped at the portion fastened by the binding band 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 binding band 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 arranging the band fixing portion 21 one small diameter portion 11 away from the annular member 30, 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, it is possible to reliably maintain a tight contact state between the inner peripheral surface of the grommet 20 and the annular member 30. 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 locking portion 22 is not positioned on the +X direction side of the band fixing portion 21, it is pushed inward in the diameter, comes into close contact with the small diameter portion 11, and can fill the gap between the corrugated tube 10 and the grommet 20. Therefore, the corrugated locking portion 22 is less affected by the tightening of the cable tie 40 fixed by the band fixing portion 21, and can exhibit waterproofing properties.

[0137] In correspondence between the configuration of this invention and the above-mentioned embodiment, The corrugated tube mounting structure of the present invention corresponds to the corrugated tube mounting structure 1 of the embodiment, Similarly, The corrugated tube is compatible with the 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 is compatible with cable ties 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, thereby reducing the diameter of the radially inner region of the band fixing portion 21 of the grommet 20, but it is sufficient if it adheres closely to the outer periphery of the grommet 20 and suppresses the diameter expansion 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 Figure 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. Specifically, 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 tube mounting structure 1x to which the annular member 30x is attached.

[0141] Furthermore, the respective components of the annular member 30x and the corrugated tube mounting structure 1x shown in FIG. 7 are similar to the respective components of the annular member 30 and the corrugated tube mounting structure 1 described above, and therefore the same reference numerals are used and their description will be omitted.

[0142] As shown in FIG. 7(a), the annular member 30x is configured in a circular ring shape that is concave in cross section and recessed radially inward. The annular member 30x is integrally formed of a thin annular portion 32 that covers 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 Figure 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 is fitted over the grommet 20 so that the corrugated tube engaging piece 23 fits in, and a binding band 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 accidentally coming off the large diameter portion 12 unintentionally.

[0146] Furthermore, deformation of the thin annular portion 32 due to pressure sandwiched between the corrugated tube 10 and the grommet 20 is restricted by the thick annular portions 31 extending from both sides of the thin annular portion 32 in the longitudinal direction X. Therefore, the thin annular portion 32 can be prevented from escaping due to the applied pressure, and pressure can be reliably applied to the thin annular portion 32 supported by the thick 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 can be more reliably prevented from entering the inside of the grommet 20.

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

[0148] As described above, by providing a circumferentially continuous recess on the inner surface of the grommet 20 at the contact point of the annular member 30, 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 the 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 reduces the water pressure acting on the annular member 30, making it possible to better prevent water from entering the interior. [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 Locking 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 ties 41···Buckle 42. Band 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 the longitudinal direction; a grommet fitted onto an end of the corrugated tube; 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 abuts against the outer peripheral surface and the inner peripheral surface; A band is provided which is fixed to the outer periphery of the grommet, A band fixing portion in which the band fits is provided on the outer peripheral surface of the grommet on the opposite side of the corrugated insert end side from the radially outer region of the annular member. Corrugated mounting structure.

2. The annular member is disposed on the outer periphery of the small diameter portion of the corrugated tube. The corrugated mounting structure according to claim 1 .

3. A recessed portion that is recessed more than other portions is formed along the circumferential direction on the inner surface of the grommet at a location where the annular member arranged on the outer periphery of the small diameter portion abuts. The corrugated mounting structure according to claim 2 .

4. 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. The corrugated sheet mounting structure according to claim 2 or 3.

5. The annular member is disposed on the outer periphery of the large diameter portion of the corrugated tube. The corrugated mounting structure according to claim 1 .

6. The annular member has a thin-walled annular portion that covers the large diameter portion of the corrugated tube, and thick-walled annular portions that extend from the thin-walled annular portion on both sides in the longitudinal direction and are disposed on the adjacent small diameter portion. The corrugated mounting structure according to claim 5.

7. a corrugated engaging portion protruding radially inward from the inner circumferential surface of the grommet; The corrugated tube engaging portion is disposed on the small diameter portion of the corrugated tube. The corrugated sheet mounting structure according to any one of claims 1 to 6.

8. The annular member is disposed closer to the corrugated insertion end of the grommet than the corrugated engagement portion. The corrugated mounting structure according to claim 7.

9. A band is provided which is fixed to the 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 sheet mounting structure according to claim 7 or 8.

10. The band fixing portion is provided on the outer peripheral surface of the grommet separated from the annular member by one or more small diameter portions. The corrugated mounting structure according to claim 1 .

11. No corrugated wire locking portion is disposed on the corrugated wire insertion end side of the band fixing portion. The corrugated sheet mounting structure according to claim 1 or claim 10.

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