JPH08129917A - Grommet - Google Patents

Abstract

PURPOSE: To comply with different-diameter wire harnesses and surely waterproof it by providing a wire harness insertion part with a large-diameter cylinder part extending to a partition wall attachment part, a conical cylinder in its end, and a short small-diameter cylinder part at its further end continuously. CONSTITUTION: Diameters of a small-diameter cylinder part 12c and a conical cylinder 12b of an insertion part 12 of a grommet 10 are enlarged by a grommet enlargement machine so that a wire harness is inserted therein. When the wire harness has small diameter, the small-diameter cylinder part 12c, and when it has a large diameter, the conical cylinder part 12b is closely fitted around the outer circumference of the wire harness so as to secure sealing performance. After the grommet 10 is made to axially slide so as to minutely adjust a position, an adhesive tape is wound up so as to be fixed to the wire harness while a projection piece 13 contacts with the outer circumference. In this state, an engagement groove 11b of the grommet 10 is made to engage with the circumferential edge of the penetration hole of a partition wall of a vehicle so as to be assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet used for penetrating a wire harness through a bulkhead of a vehicle,
In particular, it is possible to cope with different wire harness diameters depending on the type and grade of the vehicle.

[0002]

2. Description of the Related Art Conventionally, when a wire harness is pierced through a partition wall such as a vehicle body panel that separates a vehicle compartment from an engine room, the wire harness is attached to the grommet 1 shown in FIG. 7 for waterproofing. The grommet 1 is attached to the through hole 2a of the partition wall 2 in this inserted state.
The grommet 1 has a large diameter conical cylindrical expanded portion 1b having an engagement groove 1a that engages with the through hole 2a, and the expanded portion 1
It is provided with a cylindrical reduced diameter portion 1c which is continuous with the reduced end portion of b and projects with a uniform inner diameter.

A wire harness W / H is attached to the grommet 1.
When inserting the wire harness W / H, the diameter-reduced portion 1c is expanded by a grommet expander (not shown), and the wire harness W / H is inserted into the wire harness insertion hole 1d formed by the hollow portion of the diameter-reduced portion 1b and the diameter-reduced portion 1c. Then, the reduced diameter portion 1c and the wire harness W / H are wound and fixed by the adhesive tape 3.
Then, the fixing position of the grommet 1 and the wire harness W / H is finely adjusted if necessary. In this state, the through hole 2a of the partition wall 2 is engaged with the engaging groove 1a of the grommet 1 to be attached to the vehicle.

The grommet 1 has a wire harness W /
It is preferable that the outer diameter of H and the inner diameter of the reduced diameter portion 1c are the same or the inner diameter of the reduced diameter portion is formed slightly larger, and the reduced diameter portion 1c is attached in close contact with the outer periphery of the wire harness W / H. However, the outer diameter of the wire harness W / H varies depending on the vehicle model, and often varies depending on the grade even within the same vehicle model.

When the grommets 1 having inner diameters corresponding to the wire harnesses W / H are formed, corresponding molding dies are required, resulting in high cost. Also,
Since the type (number of parts) of the grommet 1 increases, the work for selecting the grommet 1 having the corresponding diameter during the assembling work with the wire harness W / H increases and the workability deteriorates. Further, there is a drawback that it takes time and effort to store and manage a plurality of types of grommets 1.

Therefore, usually, one type of grommet 1 having a single diameter is used, and wire harnesses W / H having different diameters are inserted into the grommet 1.

[0007]

However, when the small diameter wire harness W / H-1 having an outer diameter smaller than the inner diameter of the reduced diameter portion 1c is inserted into the grommet 1, the grommet 1 is inserted into the reduced diameter portion 1c. Is in a state where the small diameter wire harness W / H-1 is loosely inserted. When the tape is wound around the reduced diameter portion 1c and the small diameter wire harness W / H-1 in this state as described above, the reduced diameter portion 1c is folded back in a wave shape as shown in FIGS. 8 (A) and 8 (B). As a result, a gap is formed between the inner peripheral wall of the folded-back portion and the wire harness W / H, so that there is a problem that the sealing performance is poor and reliable waterproofing cannot be achieved.

On the other hand, as shown in FIG. 9, the urethane foam 5 is wound around the outer circumference of the small-diameter wire harness W / H-1, and the outer circumference of the urethane foam 5 and the reduced diameter portion 1c.
If the inner diameters of the tapes match, the taper 3c
The problem that there is a gap between and can be solved. However, in this case, urethane foam 5 is used for small diameter wire harness W / H.
Since the number of assembling steps for wrapping around -1 is increased, the workability is poor and the cost is high.

On the other hand, as shown in FIG. 10, the grommet 1
When inserting a large-diameter wire harness W / H-2 having a large outer shape, the reduced-diameter portion 1c is pushed in and inserted with force, so the reduced-diameter portion 1c and the large-diameter wire harness W / H are in close contact with each other. , Can be surely waterproof. However, in this case, since the wire harness W / H cannot be easily inserted into the grommet 1, the workability is poor and the adhesion between the reduced diameter portion 1c and the large diameter wire harness W / H-2 becomes too high. However, it becomes difficult to move the fixing position of the grommet 1 and the large-diameter wire harness W / H-2 in the Y direction in the drawing to perform fine adjustment.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a grommet capable of adapting to the outer diameter of a wire harness, ensuring sealing performance, and ensuring waterproofness. I am trying.

[0011]

In order to achieve the above object, the present invention provides a partition wall according to claim 1, wherein the partition wall is provided with an engaging groove for engaging with a through hole provided in the partition wall of the vehicle and into which a wire harness is loosely inserted. In a grommet having a mounting portion and a wire harness insertion portion that is continuous at one end of the partition wall mounting portion, the wire harness insertion portion includes a large-diameter tubular portion continuous with the partition wall mounting portion, and a tip of the large-diameter tubular portion. It is intended to provide a grommet characterized in that a conical cylindrical portion to be reduced and a small-diameter cylindrical portion having a short axial length are continuously provided at a tip of the conical cylindrical portion.

The inclination angle of the conical cylinder is 40 ° to 60 °.
And the length of the small diameter cylinder is 2 to 4
mm range, the total length of the wire harness insertion part is 15 mm ~
It is preferable to set it in the range of 20 mm. (Claim 2)

The wire harness insertion portion branches from the tip of the large-diameter tubular portion to the conical tubular portion, projects toward the tip end at the outer peripheral position of the conical tubular portion, and further projects from the tip of the small-diameter tubular portion. It is preferable that two or more protruding pieces are provided, and the protruding pieces serve as a tape winding margin when the wire harness is inserted. (Claim 3)

It is preferable that the wire harness insertion portion has two or more projecting pieces protruding from the tip of the small-diameter cylindrical portion, and the projecting pieces serve as a tape winding allowance when the wire harness is inserted. (Claim 4)

[0015]

According to the grommet according to the first aspect of the present invention, when the small-diameter wire harness is inserted inside, the small-diameter cylindrical portion at the tip of the wire harness insertion portion is attached in close contact with the outer periphery of the small-diameter wire harness. Also, when a large-diameter wire harness is inserted, the large-diameter wire harness is just fitted to the inner circumference of the large-diameter cylindrical part with the small-diameter cylindrical part and the conical cylinder of the wire harness insertion hole being expanded. It is installed in the state. In particular, since the axial length of the small-diameter tubular portion that is in close contact is short, fine adjustment of the fixing position of the wire harness and the grommet can be easily performed.

According to the grommet described in claim 2, the total length of the wire harness insertion portion of the conventional grommet is 30 mm.
While the wire harness insertion portion of the present invention has a total length of 15 mm to 20 mm and is formed shorter than the conventional grommet, the diameter of the wire harness insertion portion is expanded. Even when the large-diameter wire harness is inserted, since the length of the grommet that comes into close contact with the wire harness is short, the fine adjustment of the fixing position between the grommet and the wire harness can be easily performed.

According to the grommet according to the third and fourth aspects, the grommet is slid along the wire harness inserted therein to finely adjust the mounting position of the grommet and the wire harness, and then the wire harness insertion part is moved forward. The projecting piece projecting to and the outer periphery of the wire harness are wrapped with an adhesive tape to fix the grommet and the wire harness. Since the protrusion is used as a tape winding allowance as described above,
Even if the length of the wire harness insertion portion is shortened, the wire harness and the grommet can be sufficiently fixed with the tape. In particular, in a small-diameter wire harness, the wire harness is in close contact only with the small-diameter tubular part with a short grommet length.Therefore, by winding a projecting piece further protruding from this small-diameter tubular part with tape, the small-diameter tubular part and the wire The adhesion with the harness can be further enhanced, and the sealing performance can be reliably ensured.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. As shown in FIGS. 1 (A) and 1 (B), the grommet 10 of the first embodiment has a partition wall mounting portion 11 which is mounted in a through hole 2a of a partition wall 2 which partitions a vehicle compartment from an engine room.
The wire harness insertion portion 12 that is continuous with one end of the partition wall mounting portion 11 and the protrusion 13 that is continuous with the wire harness insertion portion 12 are integrally formed of rubber, elastomer, or the like. The grommet 10 is a small diameter wire harness W / H
From -1 to large diameter wire harness W / H-2, it can be used for wire harnesses W / H having different diameters.

The partition wall mounting portion 11 has an opening 11a at one end.
Is provided, and the wire harness W / H is loosely inserted into the inside of the large-diameter cylindrical shape in which the wire harness insertion portion 12 is continuous at the center of the closed surface 11c at the other end. An engaging groove 11b that engages with the inner peripheral edge of the through hole 2a is provided on the outer periphery of the partition mounting portion 11 on the side of the opening 11a. Further, the other closing surface 11c is slightly recessed in a conical shape toward the opening 11a side.

The wire harness insertion portion 12 has a large-diameter cylindrical portion 12a which is continuous with the partition wall mounting portion 11, a conical cylindrical portion 12b which is smaller than the distal end of the large-diameter cylindrical portion 12a, and a distal end of the conical cylindrical portion 12b. A small-diameter cylindrical portion 12c protruding further ahead is continuously provided.

The large-diameter cylindrical portion 12a is the partition wall mounting portion 1
One of the closed surfaces 11c is continuous with the opening provided in the center and protrudes in a cylindrical shape. The inner diameter d1 of the large-diameter cylindrical portion 12a is set to be substantially the same as the diameter of the large-diameter wire harness W / H-2 having a large outer diameter, of the wire harnesses W / H arranged in the vehicle.

The conical cylindrical portion 12b is the large diameter cylindrical portion 12a.
The conical shape that gradually shrinks from the tip of the
It is set in the range of 60 ° to 60 °. In addition, the conical cylindrical portion 1
The inner diameter d2 of the front end opening 12d of 2b is the small-diameter wire harness W / H-1 of the wire harnesses W / H to be installed in the vehicle.
The diameter is set to be almost the same.

The small diameter cylindrical portion 12c is the conical cylindrical portion 12b.
The tip end opening 12d is projected in a short length forward, and its inner diameter d2 is set to be the same as that of the opening 12d.

The total length L1 of the wire harness insertion portion 12 is
It is set in the range of 15 mm to 20 mm. On the other hand, the wire harness insertion part 1 of the conventional grommet 1 shown in FIG.
The total length of c is 30 mm to 45 mm. That is, in the grommet 10 of the present invention, the total length of the wire harness insertion portion 12 is formed shorter than that of the conventional grommet 1. Also,
The protruding length of the small diameter cylindrical portion 12c is set in the range of 2 mm to 4 mm.

The projecting piece 13 serves as a winding allowance when the grommet 10 and the wire harness W / H are wound and fixed with a tape, and from the tip of the large diameter cylindrical portion 12a to the conical cylindrical portion 12b. It is branched and protrudes outward in the circumferential direction. Further, a plurality (eight in this embodiment) of the projecting pieces 13 are projected from the large-diameter cylindrical portion 12a at required intervals in the circumferential direction. Further, a thick rib 13a protruding outward in the circumferential direction is provided at the tip of the projecting piece 13 to prevent the wound adhesive tape 15 from being displaced. The total length L2 of the projecting piece 13 is set such that the tip portion thereof projects further ahead than the tip portion of the small diameter cylindrical portion 12c.

In this embodiment, the wire harness insertion portion 12 has a total length L1 of 15 mm, the small-diameter cylindrical portion 12c has a projection length of 3 mm, and the projection 13 has a total length L2 of 30 mm. Also,
The wire harness insertion portion 12 has a uniform thickness of 1.5 mm. Furthermore, the inner diameter d1 of the large-diameter cylindrical portion 12a is 30 mm,
The tip end opening 12d of the conical cylinder portion 12b and the inner diameter d2 of the small diameter cylinder portion 12c are set to 10 mm.

Next, the assembling work of the grommet 10 will be described. When inserting the wire harness W / H into the grommet 10, first, a small diameter cylindrical portion 12c of the wire harness insertion portion 12 is formed by a grommet spreader (not shown).
And the diameter of the conical tube portion 12b is expanded.

As shown in FIG. 2 (A), when the small-diameter wire harness W / H-1 is inserted into the grommet 10, the small-diameter cylindrical portion 12c of the wire harness insertion portion 12 corresponds to the small-diameter wire harness W / H-1. It is attached closely to the outer peripheral surface.
Further, the projecting piece 13 extends in the length direction of the small diameter wire harness W / H-1 in a state of being spaced apart from the outer circumference of the small diameter wire harness W / H-1 by a required distance.

Next, the grommet 10 is slid in the axial direction along the small diameter wire harness W / H-1 to finely adjust the fixing position of the grommet 10 and the small diameter wire harness W / H-1. Then, while the projecting piece 13 is elastically curved so as to come into contact with the outer peripheral surface of the small-diameter wire harness W / H-1, the adhesive tape 15 is wrapped around to form the grommet 10.
And the small-diameter wire harness W / H-1. With the wire harness W / H assembled in this manner, the grommet 10 is arranged in the through hole 2a of the partition wall 2 of the vehicle.
As shown in (B), the engagement groove 11b of the partition wall mounting portion 11 is engaged with the inner peripheral edge of the through hole 2a to be attached.

Thus, according to the grommet 10, when the small-diameter wire harness W / H-1 is inserted,
Since the small-diameter cylindrical portion 12c of the wire harness insertion portion 12 is in close contact with the outer circumference of the small-diameter wire harness W / H-1, it is possible to ensure the sealing property and reliably prevent water from entering from the outside of the vehicle to the inside of the vehicle. Further, unlike the conventional example, it is not necessary to wind another member such as urethane foam in order to match the inner diameter of the wire harness insertion portion 12 with the outer diameter of the small diameter wire harness W / H-1, so that the assembly work is complicated. It will never become expensive and the cost will not increase.

On the other hand, as shown in FIG. 3 (A), when the large diameter wire harness W / H-2 is inserted through the grommet 10, the small diameter cylindrical portion 12c and the conical cylindrical portion 12b are expanded, These are closely attached to the outer circumference of the large diameter wire harness W / H-2. In addition, the projecting pieces 13 radially protrude along the large-diameter wire harness W / H-2 at required intervals.

Next, the grommet 10 is connected to the large-diameter wire harness W / H-2 similarly to the small-diameter wire harness W / H-1.
Along the axis in the axial direction to finely adjust the fixing position of the grommet 10 and the large diameter wire harness W / H-2.
At this time, the small-diameter cylindrical portion 12c and the conical cylindrical portion 12b of the wire harness insertion portion 12 are in close contact with the outer periphery of the large-diameter wire harness W / H-2 in the expanded state. Since the total length L1 is formed short and the length of the small-diameter cylindrical portion 12c that is particularly tightly adhered is short, the work of finely adjusting the fixing position of the large-diameter wire harness W / H-2 and the grommet 10 is easily performed. You can

Then, as shown in FIG. 3B, the projecting piece 13 located on the outer circumference of the large diameter wire harness W / H-2 is curved to the outer peripheral surface of the large diameter wire harness W / H-2, Adhesive tape 15 for protrusion 13 and large wire harness W / H-
Wrap 2 and fix. In this state, grommet 10
The engaging groove 11b is engaged with the inner peripheral edge of the through hole 2a of the partition wall 2 of the vehicle to be assembled.

As described above, according to the grommet 10, the small diameter cylindrical portion 12c and the conical cylindrical portion 12b of the wire harness insertion portion 12 are expanded and brought into close contact with the outer periphery of the large diameter wire harness W / H-2. Therefore, the sealing property can be secured, and the infiltration of water from the outside to the inside of the vehicle can be reliably prevented. Thus, according to the grommet 10,
Since the wire harness insertion portion can be closely attached to all wire harnesses from the small diameter wire harness to the large diameter wire harness, it is not necessary to form grommets corresponding to different diameters of the wire harnesses.

FIG. 4 shows the grommet 10 of the first embodiment.
It shows a modified example of. In the grommet 10 shown in FIG. 4 (A), the grommet 10 has a diameter of 1 from the tip of the large-diameter cylindrical portion 12a.
Two projecting pieces 13 are provided at intervals of 80 °. Figure 4 (B)
In the grommet 10 shown in FIG. 3, three projecting pieces 13 are provided so as to project radially from the tip of the large-diameter cylindrical portion 12a at 120 ° intervals. The grommet 10 shown in FIG.
From the tip of 2a, four protruding pieces 13 are arranged at 90 ° intervals in the radial direction.
Is protruding. The grommet 10 shown in FIGS. 4A, 4B, and 4C can also obtain the same action and effect as those of the first embodiment. That is, it is sufficient that the projecting pieces 13 are two or more protruding from the tip of the large-diameter cylindrical portion 12a.

FIG. 5 shows the grommet 10 of the second embodiment. In the grommet 10, the partition wall mounting portion 11
Small diameter cylindrical portion 12c of the wire harness insertion portion 12 continuous with
Two or more (two in the present embodiment) projecting pieces 13 'are provided at 180 ° intervals in the radial direction from the tip of the above.

As shown in FIG. 6 (A), the grommet 1
When the small-diameter wire harness W / H-1 is inserted into 0, the small-diameter cylindrical portion 12c of the wire harness insertion portion 12 is attached in close contact with the outer peripheral surface of the small-diameter wire harness W / H-1. Therefore, similarly to the first embodiment, it is possible to reliably prevent water from entering from the outside of the vehicle to the inside of the vehicle.

On the other hand, as shown in FIG. 6B, when the large diameter wire harness W / H-2 is inserted through the grommet 10, the small diameter cylindrical portion 12c and the conical cylindrical portion 12b are expanded, The wire harness insertion portion 12 has a large diameter wire harness W.
/ H-2 in close contact. Even when the large-diameter wire harness W / H-2 is inserted, since the total length of the wire harness insertion portion 12 is formed to be short as in the first embodiment, the grommet 10 and the large-diameter wire harness W / H are formed.
The mounting position with -2 can be finely adjusted, and reliable waterproofing can be achieved.

Further, according to the grommet 10 of the second embodiment, the wire harness W / H is inserted by the protruding piece 13 'serving as the winding margin of the adhesive tape 15 protruding from the tip of the small diameter cylindrical portion 12c. In this state, the protruding piece 13 'extends in the lengthwise direction while being in close contact with the wire harness W / H. Therefore, it is possible to improve the workability of fixing the grommet 10 and the wire harness W / H by winding the projecting piece 13 ′ and the wire harness W / H with the adhesive tape 15.

[0040]

As is apparent from the above description, in the grommet according to claim 1 of the present invention, the wire harness insertion portion is formed by the large diameter tubular portion, the conical tubular portion, and the small diameter tubular portion,
When the small-diameter wire harness is inserted through the wire harness insertion portion, the small-diameter tubular portion is in close contact with the outer periphery of the small-diameter wire harness, while when the large-diameter wire harness is inserted,
Since the small-diameter tubular portion and the conical tubular portion are in close contact with the outer periphery of the large-diameter wire harness in the expanded state, it is possible to reliably prevent water ingress from the outside of the vehicle to the inside of the vehicle.

As described above, since it is possible to match the outer diameters of all wire harnesses, from small diameter wire harnesses to large diameter wire harnesses, with one type of grommet, the inner diameters of the wire harness insertion portions can be made different from each other. It is not necessary to form the grommet, and various problems associated therewith can be prevented.

In the grommet according to the second aspect, since the wire harness insertion portion is formed to be shorter than the wire harness insertion portion of the conventional grommet, the wire harness is inserted while the diameter of the wire harness insertion portion is expanded. Even when it is made, the adhesion between the wire harness insertion part and the wire harness insertion part becomes low. Therefore, after inserting the wire harness through the grommet, the work of finely adjusting the mounting position of the grommet and the wire harness for mounting on the partition wall can be easily performed.

In the grommet according to the third aspect of the present invention, the protrusion protruding from the large-diameter cylindrical portion of the wire harness insertion portion and the wire harness are wound and fixed by the adhesive tape, so that the wire harness is securely fixed at the mounting position of the wire harness. You can do it.

In the grommet according to the fourth aspect, since the projecting piece extends along the outer periphery of the wire harness with the wire harness inserted through the grommet, the workability of winding the adhesive tape can be improved.

[Brief description of drawings]

FIG. 1 shows a grommet according to a first embodiment of the present invention,
(A) is a perspective view and (B) is a sectional view.

2A is a sectional view showing a state where a small diameter wire harness is inserted through the grommet in FIG. 1, and FIG. 2B is a sectional view showing a state where the tape is wound and fixed.

3A is a cross-sectional view showing a state in which a large-diameter wire harness is inserted through the grommet of FIG. 1, and FIG. 3B is a cross-sectional view showing a state in which a tape is wound and fixed.

4 (A), (B) and (C) are perspective views of essential parts showing a modified example of the grommet of the first embodiment.

FIG. 5 is a perspective view showing a grommet of a second embodiment.

6A is a sectional view showing a state where a small diameter wire harness is inserted into the grommet of FIG. 6, and FIG. 6B is a sectional view showing a state where a large diameter wire harness is inserted.

FIG. 7 (A) is a perspective view showing a conventional grommet, (B).
FIG. 6B is a cross-sectional view showing a state in which the wire harness is inserted into the grommet of FIG.

8A and 8B show a state in which a small-diameter wire harness is inserted into the grommet of FIG. 7, FIG. 8A being a sectional view, and FIG. 8B being a perspective view.

FIG. 9 is a cross-sectional view showing a state in which the small diameter wire harness is inserted into the grommet by another method.

10 is a cross-sectional view showing a state in which a large diameter wire harness has been inserted into the grommet of FIG.

[Explanation of symbols]

 2 Partition 2a Through hole 10 Grommet 11 Partition mounting part 11b Engagement groove 12 Wire harness insertion part 12a Large diameter cylindrical part 12b Conical cylindrical part 12c Small diameter cylindrical part 13 Projection piece W / H Wire harness W / H-1 Small diameter wire harness W / H-2 Large wire harness

Claims (4)

[Claims] 1. A partition wall mounting portion having an engaging groove for engaging with a through hole provided in a partition wall of a vehicle, into which a wire harness is loosely inserted, and a wire harness insertion portion continuous to one end of the partition wall mounting portion. In the grommet, the wire harness insertion portion includes a large-diameter cylindrical portion that is continuous with the partition wall mounting portion, and a conical cylindrical portion that contracts from the tip of the large-diameter cylindrical portion.
A grommet characterized in that a small-diameter cylindrical portion having a short axial length is continuously provided at the tip of the conical cylindrical portion. 2. The inclination angle of the conical cylindrical portion is 40 to 60.
In addition to setting in the range of °, the length of the small diameter cylinder is 2 to
Within the range of 4 mm, the total length of the wire harness insertion part is 15 mm
The grommet according to claim 1, wherein the grommet is set in a range of 20 mm. 3. Two or more parts branching from the tip of the large-diameter tubular portion to the conical tubular portion, projecting toward the tip side at the outer peripheral position of the conical tubular portion, and further projecting from the tip of the small-diameter tubular portion. The grommet according to claim 1 or 2, wherein the protrusion is provided, and the protrusion is used as a tape winding margin when the wire harness is inserted. 4. The grommet according to claim 1, wherein two or more projecting pieces are provided so as to project from the tip of the small-diameter tubular portion, and the projecting pieces serve as a tape winding margin when the wire harness is inserted.