JP3346412B2 - Grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a grommet,
More specifically, it is mounted on a wire harness routed to an automobile and mounted in a through hole of a vehicle body panel to protect the wire harness in a portion where the through hole is inserted, and to protect the wire harness from water and dust.

[0002]

2. Description of the Related Art Conventionally, a grommet is mounted on a wire harness routed from an engine room of an automobile to a vehicle interior, and a grommet is attached to a through hole of a vehicle body panel that separates the engine room and the vehicle interior. Protection of the wiring harness passing through and waterproofing from the engine room side to the car room,
Dust protection and sound insulation are provided.

[0003] As this type of grommet, there is provided a so-called one-motion grommet in which a body locking recess provided on the outer periphery of the grommet is locked to the peripheral edge of the through hole by simply pushing the grommet into the through hole of the body panel from one direction. Have been.

As shown in FIG. 11, the grommet 1 includes a small-diameter tube portion 2 and a large-diameter tube portion 3 continuous with the small-diameter tube portion 2. A stop recess 4 is provided, and both side walls sandwiching the groove 4a of the vehicle body engaging recess 4 have a vertical wall 4b on the large diameter tip side and an inclined wall 4c on the opposite small diameter side. The grommet 1 is formed by passing a wire harness W / H from the small-diameter cylindrical portion 2 to the hollow portion of the large-diameter cylindrical portion 3, and is fixed to the distal end side of the small-diameter cylindrical portion 2 with a tape T.

[0005] As shown in FIG. 12, the work of mounting the vehicle body panel P into the through hole H is performed by inserting the vehicle body panel P through the small-diameter cylindrical portion 2 and inserting the inclined wall 4
c is deformed so as to be crushed inward and passed through the through hole H,
The inclined wall 4c and the vertical wall 4b, which return after passing, are brought into close contact with both surfaces of the vehicle body panel P, and the vehicle body locking recess 4 of the grommet 1 is mounted in the through hole H of the vehicle body panel P.

[0006]

In the case of the one-motion grommet described above, when the grommet 1 is inserted obliquely into the through hole H as shown in FIG.
Is excessively pressed to deform the outer peripheral surface of the thin-walled enlarged-diameter cylindrical portion 3 until reaching the inclined wall 4c of the vehicle body locking concave portion 4 so that the inclined wall 4c to be bent inward is reversed. This causes the inclined wall 4c to bend in the direction of warping outward, so that the inclined wall 4c hits the vehicle body panel P and cannot be inserted into the through hole H.

The above problem does not occur if the grommet 1 is inserted straight and the center axis of the grommet 1 is aligned with the center of the through hole H. However, the work of inserting the grommet 1 into the through hole may be difficult to insert straight, and may be obliquely inserted, in many cases, due to the work posture due to space restrictions. In addition, if the thickness of the enlarged diameter cylindrical portion of the grommet 1 is made large so as not to bend easily, the above-mentioned problem can be solved to some extent, but in that case, the insertion force of the grommet into the through hole becomes large. Problems arise.

[0008] The present invention has been made in view of the above-mentioned problems, and does not increase the insertion force, and can be inserted obliquely.
It is an object of the present invention to allow a grommet to be mounted in a through hole of a vehicle body panel.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a small-diameter tube portion and an enlarged-diameter tube portion connected to the small-diameter tube portion. With the wire harness penetrated and attached, insert it into the through hole of the vehicle body from the small-diameter cylindrical part side, and use a grommet that locks the vehicle body locking recess provided on the outer peripheral surface of the large-diameter cylindrical part to the vehicle body panel. A large-diameter end-side wall of the large-diameter cylindrical portion sandwiching the vehicle-body locking recess, and a small-diameter side inclined wall opposed to the wall, wherein the inclined wall is bent inward to form the through hole; A plurality of protruding ridges extending in the axial direction are provided on the outer peripheral surface of the enlarged-diameter cylindrical portion, and these protruding ridges are close to each other near the small-diameter end side, and are inclined. At the tip end of the wall, it spreads radially, and between the adjacent ridges, dents formed by the outer peripheral surface of the enlarged-diameter cylindrical portion are generated. A grommet, characterized in that each of the parts has at least as many axial grooves as necessary to reduce the diameter corresponding to a predetermined insertion load at positions corresponding to contact points of the through holes of the vehicle body. are doing.

[0010] The groove provided along the outer peripheral surface of the enlarged diameter cylindrical portion is provided from near the small diameter cylindrical portion to near the tip of the inclined wall. As described above, when the axial groove is formed on the outer peripheral surface of the enlarged-diameter cylindrical portion from the vicinity of the continuous end with the small-diameter cylindrical portion to the vicinity of the vehicle body locking concave portion, the grooved portion becomes thin and the grommet is easily bent. . Therefore, even if the grommet is obliquely inserted and the grommet is caught on the inner peripheral surface of the panel through hole, the grommet can be bent to easily correct the insertion posture.

[0011] Further, when a girder is provided with a ridge protruding in the axial direction along the outer peripheral surface of the enlarged-diameter cylindrical portion of the grommet, when the grommet is obliquely inserted, first, the ridge is formed inside the through hole. By hitting the peripheral surface, the operator knows that the insertion is performed diagonally, and the operator can start over to the straight insertion posture.
In addition, when a ridge is projected from the outer peripheral surface of the enlarged diameter cylindrical portion, the enlarged diameter cylindrical portion is reinforced, and when the oblique insertion is performed, the thin enlarged diameter cylindrical portion reaches the inclined wall of the vehicle body locking concave portion. However, it does not cause the phenomenon of warping outward on the side in contact with the inner peripheral surface of the through hole.
Therefore, the problem at the time of oblique insertion which occurred in the conventional grommet can be solved.

Further, since the ridges are densely arranged on the small diameter side, it is advantageous in correcting the direction at the time of oblique insertion. On the other hand, in the case of straight insertion, even if the ridges are densely arranged, the insertion force does not increase because they do not contact the inner peripheral surface of the through hole. On the other hand, since the area of the thin recessed portion becomes larger toward the larger diameter side, it becomes easier to bend in the diameter reducing direction, and the insertion force can be reduced.

Since the recess is provided with a groove, when the outer surface of the ridge comes into contact with the inner peripheral surface of the through hole and is bent inward, it is easy to bend in the radial direction with the groove as a center.

The groove provided in each of the recesses may be provided only at the center, or two grooves may be provided along the base of the ridge. Further, three grooves may be provided, and the grooves on both sides may be provided at positions along the base of the ridge. in this case,
The grooves on both sides may protrude to the tip side of the inclined wall, and the length of the groove may be reduced to near the tip in the center. In addition, both side grooves may be provided along the base of the protruding ridge portion, and a C-shaped groove may be provided in which the front ends of the both side grooves and the center groove are continuous.

If a single groove is provided at the center of the triangular depression as described above, it becomes easy to bend around this groove. When a groove is provided at the base of the ridge, the ridge is easily bent from the base. Furthermore, if one piece at the center and two pieces at the base are added, the ease of bending is doubled. Furthermore, since the area of the depression increases on the front end side, if a C-shaped groove that connects the front end of the center groove and both side grooves is provided, the groove guides the groove in the direction in which the depression is folded. The diameter can be reduced without difficulty.

The amount of protrusion of the ridge portion is changed at a position that is a point of contact with the inner surface of the through hole when the ridge is inserted into the through hole. Further, it is preferable that the protrusion has a portion having a different inclination angle from the contact point to the tip of the inclined wall, and the inclination angle of a portion connected to the tip of the inclined wall be minimized. The portion where the amount of protrusion is reduced has a shape in which the outer surface of the ridge portion is bent at different inclination angles. Alternatively, it has an arc shape.

With the above structure, when the grommet is inserted into the through hole of the vehicle body panel, a sense of moderation is generated when the contact point is reached, because the inclination angle of the outer surface of the ridge is changed. From this point of contact, it is necessary to bend the inclined wall inward and push it in.Therefore, from the point when the sense of moderation occurs, the worker increases the force at a stretch and pushes it in. It can be carried out. Further, since the amount of protrusion of the ridge portion is reduced from the contact point, the insertion force can be reduced.

An end surface is provided at the large diameter end of the enlarged diameter cylindrical portion, and a second small diameter cylindrical portion is projected from the center of the end surface portion.
It is a tape winding fixed part with the wire harness. As described above, when the wire harness is fixed at the both ends in the length direction of the grommet provided with the second small-diameter cylindrical portion by tape, it is possible to increase the work time for inserting the grommet into the through hole. Further, a lip protrudes from the bottom surface between the large-diameter end side wall and the inclined wall of the vehicle body locking recess. By providing the lip, the sealing property can be improved. Furthermore, the large-diameter end side wall of the vehicle body locking recess projects radially outward from the tip of the inclined wall.

A cable insertion tube portion protrudes from a peripheral edge of an opening provided in the above-mentioned enlarged diameter tube portion. If the cable insertion tube portion is provided as described above in which the opening of the cable insertion tube portion is located in the recessed portion between the ridges, if there is an optional component, a cable to be connected to the optional component is provided. The cable can be passed through the through-hole of the vehicle body panel through the cable insertion tube portion, and the usability is improved. The protruding end of the cable insertion tube portion is set as a closed end, and the end is cut off at the time of use so that the cable can be inserted through the opening. Further, since the opening of the cable insertion cylinder is provided in the depression of the enlarged diameter cylinder, the depression can be easily deformed, and the insertion force at the time of the insertion operation into the through hole can be reduced.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 9 show a first embodiment. The grommet 10 is integrally formed of rubber, and has a shape in which a large-diameter cylindrical portion 13 is continuous between a first small-diameter cylindrical portion 11 on the insertion-side front portion and a second small-diameter cylindrical portion 12 on the rear side. . The large-diameter cylinder portion 13 has a conical shape larger than a continuous end of the small-diameter cylinder portion 11, has a large-diameter distal end portion having a large thickness, and has a vehicle body locking concave portion 14 provided in an annular shape on the outer peripheral surface thereof.

The both side walls of the vehicle body locking recess 14 are composed of a vertical wall 14a serving as a wall on the large diameter end side and an inclined wall 14c opposed to each other with a groove 14b interposed therebetween. The groove 14b is provided with lightening portions 14d and 14e in the front and rear direction at the back thereof, and has a lip 14h protruding from the bottom of the groove. As shown, the vertical wall 14a projects radially outward from the tip of the inclined wall 14c.

Along the outer peripheral surface of the enlarged-diameter cylindrical portion 13, at intervals in the circumferential direction, from the small-diameter side continuous with the small-diameter cylindrical portion 11 to the large-diameter side of the inclined wall 14 c of the vehicle body locking concave portion 14 in the axial direction. Are provided. The ridge 2
Reference numeral 0 denotes a so-called rib-like shape which protrudes from the outer peripheral surface of the enlarged-diameter cylindrical portion 13 in a step-like and thick manner. In the present embodiment, the eight ridges 20 extend in the axial direction with the same width W in the circumferential direction from the small diameter end P1 to the large diameter end P2, and the eight ridges 20 have the same shape. In the present embodiment, the width W of each ridge 20 is 10 mm, the length L in the axial direction is 14.8 mm, and the outer diameter D of the tip of the inclined wall (P2 position) at the protrusion of the ridge 20.
Is 76 mm, and the outer diameter of the small diameter end (P1 position) is 63.9 mm.
And

The protrusion amount H of the protruding ridge portion 20 protruding from the outer peripheral surface of the diameter-enlarged cylindrical portion 13 is changed at a position which becomes a contact point P3 with the through hole inner surface 30a when the vehicle body panel P is inserted into the through hole 30. From the contact point P3 to the position P2 of the tip of the inclined wall, the amount of protrusion H1 between P3 and the small-diameter end P1 is smaller than H1.

Further, from the position P4 where the outer surface 20a of the ridge 20 is flush with the tip P2 of the inclined wall, the outer surface 20a of the ridge is parallel to the axial direction X of the grommet, and P2 of the tip of the inclined wall 14c from P4. Up to a straight line. As described above, the protrusion amount of each ridge 20 is smaller than the small diameter side P1.
On the smaller diameter side of P3 to P3, the maximum height H1 and the protrusion amount H2 from P3 to P4 satisfy H1> H2 and refract the outer surface 20a. Further, the projection amount H3 from P4 to the tip end P2 of the inclined wall is equal to or less than H2 and is gradually reduced.

As described above, the inclination angle of the outer surface 20a of each projection 20 with respect to the axis X is changed into two steps θ1 and θ2, and the inclination angle θ1 is made the largest on the small-diameter cylindrical part side, and the contact point P3 The inclination angle θ2 is reduced, and when the inclination angle θ2 becomes the same position as the protruding end of the inclined wall, the inclination angle is set to 0 and the shape is bent in three steps.

Since the width W of each ridge 20 is the same in the axial direction X, it extends radially from the small-diameter end P1 to the large-diameter end P2. Ridge 2 on small diameter end P1 side
In the end 20b of 0, the adjacent ridges are densely arranged, and in the end 20c of the ridge 20 of the large-diameter end P2, there is an interval between the adjacent ridges, and the enlarged cylindrical portion 13 is formed. Are formed in the direction in which the triangular recess 21 formed from the outer peripheral surface 13a spreads from the small diameter side to the large diameter side.

An axial center groove 22 is provided at the center of the recess 21 in the circumferential direction. Further, both side grooves 24A and 24B are provided along the base of the ridge 20. 24 grooves on both sides
A and 24B extend to P4 near the tip of the inclined portion, the central groove 22 is shorter than the side grooves 24A and 24B, and the tip does not protrude more toward the tip of the inclined portion than the tip of both side grooves. The ridges 20 are formed by these grooves 22, 24A and 24B.
Even if the rigidity of the enlarged diameter cylindrical portion 13 is increased by protruding, it can be easily bent in the diameter decreasing direction when it is inserted into the through hole of the vehicle body panel. That is, the grooves 22, 24A,
24B guides the dent 21 in the direction in which it is folded to reduce the diameter without difficulty.

A thin end face 25 is provided at the large-diameter end of the large-diameter cylinder section 13, and the second end face 25 is located at the center of the end face 25.
Is projected. The second small-diameter cylindrical portion 1
2, a slit 12a is provided at a position facing the small-diameter cylindrical portion 12
Is divided into two semi-annular pieces 12b and 12c.

Further, the grommet 10 is provided with two cable insertion tube portions 26 connected to optional parts.
The cable insertion tube portion 26 is provided with an opening 26 a in the concave portion 21 on the outer peripheral surface of the enlarged diameter tube portion 13, passes through the inside of the enlarged diameter tube portion 13,
It is formed so as to protrude from the end face portion 25. This protrusion 2
The distal end of 6b is a closed portion 26c, which is cut at a cutting portion 26d when the cable is passed to make an opening.

The grommet 10 having the above structure is attached to the wire harness W / H as shown in FIG.
The grommet 10 is attached to the through hole 30 of the vehicle body panel P composed of a dash panel that separates the vehicle from the indoor side (Z).

The grommet mounting operation will be described below. The first small-diameter cylindrical portion 11 is pushed into the through hole 30 from the outdoor side (Y) side. At this time, if the grommet 10 is obliquely inclined, a part of the ridge 20 hits the inner peripheral surface of the through hole 30 and a contact resistance is generated. Thereby, the worker corrects the insertion posture of the grommet 10. In addition, since a large number of protrusions 20 are provided on the outer peripheral surface of the thin-walled enlarged-diameter cylindrical portion 13,
When the grommet 10 is obliquely inserted, the rigidity of the enlarged-diameter tube portion 13 is increased, so that it is possible to reliably prevent the enlarged-diameter tube portion 13 at a portion pressed against the inner peripheral surface of the through hole from being bent.

The enlarged diameter cylindrical portion 13 of the grommet 10 has the through hole 3
0, and the ridge 20 is the same as the inner diameter of the through hole 30.
When the contact point P3 is reached, an operator feels moderation by pressing the outer surface 20a of the ridge 20 and the inner peripheral surface of the through hole. From this point, the operator pushes the grommet 10 at a stretch, and passes the ridge 20 through the through-hole 30 so as to crush it.

More specifically, as shown in FIG.
Since the grooves 22, 24A, and 24B are provided in the recess 21 between them, the recess 21 is easily bent in the circumferential direction. Therefore, the concave portion 21 bends so as to bulge in a mountain shape between the adjacent protruding ridge portions 20 whose interval is reduced when the diameter is reduced, and the ridge portion 20 can be smoothly reduced in diameter. And the ridge 20
Since the angle of inclination is small and the amount of protrusion from the outer peripheral surface of the enlarged diameter cylindrical portion 13 is small, a large pushing force is not required, and the pushing can be performed with a low insertion force.

Further, when the outer surface 20a of the ridge 20 reaches the same height as the distal end of the inclined wall 14c of the vehicle body locking recess 14, the ridge outer surface 20a is not parallel to the axial direction from this position P4. It is straight and guides the protruding end of the inclined wall so as to pass straight through the through hole 30.

As described above, the outer surface 20 a of the projection 20 is pressed by the inner peripheral surface of the through hole 30, and the projecting end of the inclined wall passes through the through hole 30 while reducing the diameter of the enlarged-diameter cylindrical portion 13. When the inclined wall 14c passes through the through-hole 30, it returns elastically to the initial position, and the peripheral portion of the through-hole 30 is dropped into the groove 14b between the inclined wall 14c and the vertical wall 14a. In this state, the opposing surfaces of the inclined wall 14c and the vertical wall 14a are pressed against both surfaces of the vehicle body panel P, and are pressed against the lip 14h protruding from the groove bottom of the inner peripheral surface of the through hole 30, so that the grommet 10 is It is locked in the through hole 30 of the vehicle body panel P in a sealed state.

As described above, since the grommet 10 is provided with the protruding ridges 20 on the outer peripheral surface of the enlarged-diameter tube portion 13, the operator can correct the oblique insertion posture and reinforce the thin-walled enlarged-diameter tube portion. In this way, it is possible to prevent bending, which is likely to occur at the time of oblique insertion, and to prevent the grommet 10 from being unable to be inserted into the through hole 30 even when obliquely inserted. Further, in the vicinity of the protruding end of the inclined wall, the inclined wall 14c is straightened by the ridge 20.
Are guided so as to pass through the through-hole 30, so that the through-hole 30 can be smoothly passed without causing deformation near the protruding end of the inclined wall. Furthermore,
Since the grooves 22, 24A and 24B are provided so that the recesses 21 between the ridges 20 are folded, the diameter is uniformly reduced in the circumferential direction, and the grommet 10 is inserted into the through hole of the vehicle body panel with low insertion force. Can be locked. And grommet 10
Even if the wire harness is pulled and a load in the direction of dropping from the first small-diameter tubular portion 11 is generated after the wire harness is attached to the vehicle body panel, the second small-diameter tubular portion 12 is wound around the wire harness by tape and fixed. The grommet 10 can be prevented from falling off to resist the pulling force of the harness.

FIGS. 10A, 10B, and 10C show modified examples of the groove provided in the recess 21. FIG. In FIG. 10A, one groove 22 at the center in the circumferential direction and two grooves 22 at the root of the ridge 20 are formed.
The difference is that a groove 23 is provided at the tip of the grooves 24A and 24B to be connected in an inverted C-shape. When the groove 23 is provided, the central groove 22 and the grooves 24A and 24B on both sides can be linked with each other to facilitate bending. In FIG. 10B, two grooves 24A and 24B are formed only at the base of the ridge 20. In FIG. 10C, only one groove 22 is provided at the center in the circumferential direction of the recess 21. Thus, the depression 2
Even if the number of grooves provided in 1 is changed, the grommet can be easily bent in the diameter reducing direction.

It should be noted that the present invention is not limited to the above embodiment, and the number of ridges is not limited to eight, but is not less than four to ten.
It is sufficient that the number is not more than the number, and the number can be appropriately set in relation to the thickness of the ridge portion. Further, the second small-diameter cylindrical portion on the large diameter side of the large-diameter cylindrical portion may be omitted. However, in consideration of falling off after the grommet is attached to the through hole of the vehicle body panel, the second small-diameter cylindrical portion is provided to provide the wire harness. It is preferable to fix the tape. Also, it is not always necessary to provide a cable insertion tube for optional parts. Further, it goes without saying that the present invention can also be applied to a grommet in which the through hole has an elliptical shape and the enlarged-diameter cylindrical portion has an elliptical cross-section.

[0039]

As is apparent from the above description, the grommet according to the present invention has axial grooves formed on the outer peripheral surface of the enlarged-diameter cylindrical portion at circumferential intervals. It will be easier. Therefore, when the grommet is obliquely inserted, it can be easily corrected to the normal posture.

Further, when a ridge is formed between the grooves,
By inserting the grommet diagonally and the ridges hitting the inner peripheral surface of the through hole, the operator notices the diagonal insertion and can correct the insertion posture, and the enlarged cylindrical part of the grommet is obliquely inserted against the inner peripheral surface of the through hole. In this case, since the rigidity of the enlarged-diameter tube portion is increased by the ridges, it does not occur that the enlarged-diameter tube portion is bent and cannot be inserted.

In particular, on the outer peripheral surface of the enlarged diameter cylindrical portion of the grommet,
When the groove is provided in the protruding portion and the concave portion therebetween, the diameter of the enlarged diameter cylindrical portion can be reduced smoothly. Further, when the amount of protrusion of the ridge from the position where the ridge contacts the inner peripheral surface of the through-hole is reduced, the grommet can be inserted and locked into the through-hole with low insertion force. At this time, the inclination angle of the outer surface of the ridge is changed at the position where the ridge contacts the inner peripheral surface of the through hole to give the worker a sense of moderation, so pushing the grommet at a stretch from this moderation position will improve efficiency. Good grommet mounting work can be performed.

[Brief description of the drawings]

FIG. 1 is a right side view of a grommet according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a left side view of the grommet.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a partially enlarged view of FIG. 2;

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a drawing showing a grommet through-hole insertion state.

FIG. 9 is an enlarged sectional view of a main part showing the operation of the grommet.

FIGS. 10A, 10B, and 10C are diagrams showing modified examples.

FIG. 11 is a cross-sectional view of a conventional grommet.

FIG. 12 is a view showing an example of a conventional work of inserting a grommet into a through hole of a vehicle body panel.

FIG. 13 is a view showing a conventional problem.

[Explanation of symbols]

 P Body panel 30 Through-hole 10 Grommet 11 First small-diameter cylinder part 12 Second small-diameter cylinder part 13 Large-diameter cylinder part 14 Car body locking concave part 14a Vertical wall 14b Groove 14c Inclined wall 20 Protrusions 22 to 24 Groove 25 End face Part 26 Cable insertion tube

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-11-27834 (JP, A) JP-A-10-136536 (JP, A) JP-A-11-166669 (JP, A) 147649 (JP, A) JP-A-2000-243163 (JP, A) JP-A-11-275741 (JP, A) JP-A-9-207031 (JP, A) JP-A-1-68625 (JP, U) Kaihei 2-125518 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) H02G 3/22 B60R 16/02 F16L 5/02 H02G 3/04 H02G 3/38

Claims (9)

(57) [Claims] 1. A small-diameter cylinder comprising: a small-diameter cylinder portion; and an enlarged-diameter cylinder portion connected to the small-diameter cylinder portion. A grommet that is inserted into a through hole of the vehicle body from the side of the vehicle body and locks a vehicle body locking concave portion provided on an outer peripheral surface of the enlarged diameter cylindrical portion to a vehicle body panel; The wall on the large diameter end side of
It comprises a small diameter side of the inclined wall that faces the wall, by bending the inclined wall inwardly, and so as to pass through the through hole, the outer peripheral surface of the enlarged diameter cylindrical portion is axially extending A plurality of protruding ridges projecting near the small-diameter end side, radially expanding on the tip end side of the inclined wall, and between the adjacent ridges, an outer peripheral surface of the enlarged-diameter cylindrical portion. A depression consisting of
To each of these recessed portions, corresponding to the insertion load stipulated
At least as many axial grooves as necessary to reduce the diameter
A grommet, which is provided at a position corresponding to a contact point of a through hole of a vehicle body . 2. The grommet according to claim 1, wherein the axial groove provided on the outer peripheral surface of the large-diameter cylinder portion extends from near the small-diameter end to near the tip of the inclined wall. 3. The grommet according to claim 1, wherein an amount of protrusion of the ridge portion is changed at a position that is a point of contact with an inner surface of the through hole when the ridge portion is inserted into the through hole. 4. The ridge portion has a portion having a different inclination angle from the contact point to a tip of the inclined wall, and a portion continuous with the tip of the inclined wall has the smallest inclination angle. Item 3. A grommet according to item 3. 5. The method according to claim 1, wherein one of the grooves provided in each of the recesses is provided at a center in the width direction of the recess and / or two of the grooves are provided at a root of the ridge. Or the grommet according to item 1. 6. An end face portion is provided at a leading end of the large diameter tube portion on the large diameter side, and a second small diameter tube portion is projected from a center of the end surface portion to form a tape winding fixing portion with a wire harness. The grommet according to any one of claims 1 to 5. 7. A grommet according to any one of the above vehicle body engagement Tome凹portion of the bottom surface according to claim 1 to claim 6 are projected to lip. 8. The grommet according to claim 1, wherein the large- diameter wall- side wall of the vehicle body locking recess projects radially outward from the tip of the inclined wall. 9. The grommet according to claim 1, wherein a cable insertion tube portion protrudes from a peripheral edge of an opening provided in the enlarged diameter tube portion.