JPH09129064A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of attaching a grommet to a vehicle body panel and, at the same time, improve sealing property by enhancing closely-attaching property of the grommet to the vehicle body panel. SOLUTION: This grommet comprizes a small-bore tube part 14 through which a wire harness is inserted, a front end locking part 15 whose diameter is expanded so as to spread out of the front end of the small-bore tube part 14, an outer tube part 17 which is folded down backward from the rear side of a first seal lip part 16 provided on the outer end of the front end locking part and, along with this, is equipped with a locking groove 19 in an inner circumferential surface on the rear side thereof, a grommet proper 11 equipped with a second seal lip part 18 whose diameter is expanded so as to be larger than an outer circumferential surface from the rear end of the outer tube part and is bent forward, and a pressing material 12 whose front and rear ends are openings 12a, 12b respectively and which has flange parts 21, 22 installed so as to project from an outer circumferece thereof. When the grommet is attached to a vehicle body panel 10, the pressing material is attached by being pushed therein from the small-bore tube part side of the grommet proper, the front end locking part is locked by one surface 10d of the vehicle panel and, along with this, the second seal lip part is locked by the other surface 10b of the vehicle panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet which is attached to a through hole of a vehicle body panel in a state where a wire harness is inserted, and more particularly, to improve workability of attaching the grommet.

[0002]

2. Description of the Related Art In a vehicle wire harness, as shown in FIG. 6, a wire harness W / H is formed by passing through a through hole 1a of a vehicle body panel (for example, a dash panel that separates an engine room A and a vehicle room B). When the wire harness W / H is closely attached to the small-diameter cylindrical portion 2a of the rubber grommet 2, the grommet 2 is inserted in this state.
Through the through hole 1a from the engine room A side to the vehicle compartment B side
The grommet 2 is attached to the through hole 1a of the vehicle body panel 1 by inserting the locking recess 2c provided on the outer periphery of the large diameter portion 2b into the inner peripheral edge of the through hole 1a.

[0003]

However, when the large diameter portion 2b of the grommet 2 is inserted into the through hole 1a, the dimension L1 of the locking recess 2c is made smaller than the plate thickness L2 of the vehicle body panel 1 to lock the vehicle body. Since it is closely attached to the panel, the locking recess 2c cannot be locked to the vehicle body panel 1 only by inserting from the engine room A side to the vehicle room B side.
The entire large diameter portion 2b is once pushed into the vehicle compartment B and then pulled back to the engine room A side so that the locking recess 2c is locked in the through hole 1a of the vehicle body panel 1.

As shown in FIG. 7, the same applies to the case where the burring 1b is provided on the periphery of the through hole 1a of the vehicle body panel 1, and the dimension L1 of the locking recess 2c of the grommet 2 is set to be smaller than the dimension L3 of the burring 1b. Since the grommet 2 is made small, the large diameter portion 2b of the grommet 2 is once pushed into the vehicle compartment B side and then pulled back to the engine room A side to lock the locking recess 2c to the burring 1b.

As described above, when attaching the grommet 2 to the vehicle body 1, it is necessary to push the grommet 2 toward the vehicle body B side and then reciprocate the engine room A side. Further, in the work of pushing the large diameter portion 2b of the grommet 2 through the through hole 1a, it is necessary to push the large diameter portion 2b while tilting the large diameter portion 2b, which requires an inserting force, and there is a problem that the pushing is difficult. Further, when an interference member such as an air conditioner unit is present on the side of the vehicle compartment B, the wire harness W / H passed through the grommet 2 may hit the interference member when the entire large diameter portion 2b is pushed in.

Therefore, as shown in FIG. 8, a large-diameter member 3 made of synthetic resin is fixed in place of the large-diameter portion 2b of the grommet 2, and a blade-like member is formed on the outer periphery of the large-diameter member 3. There is provided one that locks the lock portion 3a to the inner peripheral edge of the through hole 1a (see Japanese Patent Laid-Open No. 2-66816). With the above configuration, the blade-shaped lock portion is bent to pass through the through hole 1a of the vehicle body panel 1 and then restored to be locked to the inner surface of the vehicle body panel. Therefore, the grommet 2 can be attached only by pushing. However, with the above configuration, since the member that engages with the grommet 2 is made of synthetic resin, the adhesion is poor and there is a problem in terms of sealing performance.

The present invention has been made in order to solve the above-mentioned problems, and enables the grommet to be attached to the vehicle body panel by one-touch operation by inserting the grommet from one direction and the adhesion of the grommet to the vehicle body panel. The purpose is to improve the sealing property.

[0008]

In order to solve the above-mentioned problems, according to claim 1 of the present invention, the grommet main body integrally formed of rubber or elastomer and a resin pressing member are used. Is a thin-walled small-diameter tubular portion through which the wire harness is inserted, a thin-walled flexible front end locking portion that is expanded outward from the front end of the small-diameter tubular portion, and an outer end of the front-end locking portion. The thickened outer cylinder part which is folded back from the rear surface side of the provided first seal lip part and has a locking groove on the inner peripheral surface of the rear end side, and the outer peripheral surface of the rear end part of the thickened outer cylinder part The pressing member is provided with a second seal lip portion that is made to be diametrically curved forward, while the pressing member has openings at both front and rear ends, and flange portions project from outer peripheries of the front and rear ends to form a grommet for a vehicle body panel. When installing, attach the grommet body to the small-diameter cylinder from the front end opening. The front end flange engages the front end face of the outer cylinder to lock the front end retainer to one surface of the vehicle body panel, and the rear end flange engages the rear end of the outer cylinder. (EN) Provided is a grommet configured to be locked in a groove, positionally held by a grommet main body, and locked to a second surface of a vehicle body panel on a second seal lip portion.

In the grommet according to claim 1, the small-diameter cylindrical portion of the grommet body is expanded to insert the wire harness,
Wrap the outer circumference with tape and fix the grommet body to the wire harness. In this state, the front end locking portion is open outward. Further, the pressing member is slidably fitted onto the wire harness at a position behind the small-diameter cylindrical portion of the grommet body.

When the grommet is attached to the vehicle body panel, first, the front end locking portion of the grommet body is bent to pass through the through hole of the vehicle body panel from the outside of the vehicle compartment to the inside of the vehicle compartment, and the outside of the small diameter cylinder portion and its outer periphery. Insert the tube into the through hole as well. Then, the pressing member is pushed from the outside of the vehicle compartment between the small diameter cylindrical portion and the outer cylindrical portion of the grommet body, and the outer peripheral surface of the outer cylindrical portion is pressed against the inner peripheral surface of the through hole of the vehicle body panel. When the front end flange portion is locked to the front end surface of the outer tubular portion, the front end locking portion is pushed rearward to press the first seal lip portion against the inner surface of the vehicle body panel. In this state, the rear end flange portion of the pressing member is fitted into the locking groove of the outer cylindrical portion, the pressing member is positioned and held by the grommet body, and the tip of the second seal lip portion is pressed against the outer surface of the vehicle body panel. .

As described above, the grommet body fixed to the wire harness is inserted into the through hole of the vehicle body panel, and then the pressing member is pushed into the grommet body.
The front end locking portion can be locked on the inner surface side of the vehicle body panel. At the same time, the first seal lip portion can be pressed against the inner surface of the vehicle body panel, and the second seal lip is pressed against the outer surface side of the vehicle body panel so that the grommet body can seal the entire inner and outer surfaces of the vehicle body panel. The pressing material is preferably made of flexible urethane foam or polypropylene.

According to a second aspect of the present invention, the pressing member has a half-split shape, one end of the pressing member is connected through a thin hinge, and the other end of the pressing member has a locking portion including a lock portion and a locked portion. The grommet according to claim 1, which is provided and can be attached to the wire harness from the side.

As described above, when the pressing member has a slit shape, the pressing member can be attached to the wire harness from the side of the wire harness.

According to a third aspect of the present invention, the hinge portion and the locking portion of the pressing member are provided on the rear end side, and the slits are gradually reduced along the divided end from the front end side to the rear end side. The grommet described in 1. is provided.

As described above, when the pressing member is provided with a slit having a large pushing side and a gradually decreasing size, when the front end flange portion of the pressing member passes through the through hole of the vehicle body panel,
The diameter is easily reduced, and the pressing member can be easily pushed in. Further, after the front end flange portion has passed through the through hole, it can be returned to the original state and the outer cylinder portion on the outer periphery can be pressed toward the inner peripheral surface of the through hole.

According to a fourth aspect of the present invention, a third seal lip portion projecting annularly is provided on the outer peripheral surface of the outer cylindrical portion of the grommet body,
The grommet according to any one of claims 1 to 3, wherein the third seal lip portion is pressed against the inner peripheral surface of the burring projecting from the peripheral edge of the through hole of the vehicle body panel.

The above-mentioned grommet is used for a barring projecting from the peripheral edge of the through hole of the vehicle body panel toward the outside of the vehicle compartment, and the third seal lip portion projecting on the outer peripheral surface of the outer cylinder part is inside the barring. Since it comes into pressure contact with the peripheral surface, the sealability can be improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show a first embodiment, and as shown in FIG. 1, a vehicle body panel 1 such as a dash panel that partitions an engine room A and a vehicle room B of an automobile.
0 has a through hole 10a, and the through hole 10a has
A cylindrical burring 10c protruding from the outer surface 10b on the engine room (insertion) A side is formed.

The grommet G attached to the through hole 10a of the panel 10 comprises a grommet main body 11 made of rubber and a pressing member 12 made of urethane foam or polypropylene and made of a flexible resin.

The grommet body 11 is shown in FIG.
As shown in (B), a thin-walled small-diameter tubular portion 14 through which the wire harness W / H is inserted, and a thin-walled flexible front end member that is folded back from the front end of the small-diameter tubular portion 14 and expanded outwardly. The stopper portion 15 and the thick outer cylindrical portion 1 continuous with the rear end surface of the first seal lip portion 16 provided at the outer end of the front end locking portion 15.
7 and a second seal lip portion 18 having a diameter increased from the outer peripheral surface of the rear end of the outer tubular portion 17 and curved forward.

The front end locking portion 15 is arranged so that the first seal lip portion 16 at the tip becomes a flat surface along the inner surface 10d in a state of being locked to the inner surface 10d on the indoor side of the vehicle body panel 10 shown in FIG. Is forming.

The outer cylinder portion 17 is made to project inward from the outer end of the rear surface side 16a of the first seal lip portion 16 where a required dimension is provided, and is slightly longer than the length of the burring 10c and rearward. It is continuous. The outer tubular portion 17 has a recessed groove 19 on the inner peripheral surface on the rear end side thereof, and an annular third seal lip portion 20 projecting from the outer peripheral surface of the outer tubular portion 17.

The annular second seal lip portion 18 projecting outward from the rear outer peripheral surface of the outer cylinder portion 17 has its tip bent forward so that the tip portion is attached to the outer surface 10b of the vehicle body panel when the vehicle body panel is mounted. The dimensions are set so that they can be pressed together.

The pressing member 12 has openings 12 at both front and rear ends.
a and 12b, and the flange portion 2
1, 22 are projected. The flange portion 22 on the rear side is formed to have a diameter larger than that of the flange 21 on the front side in order to securely hold the attachment state to the grommet body 11.
Further, the axial length of the pressing member 12 is set to be the same as the length from the front end surface 17a of the outer tubular portion 17 of the grommet body 1 to the locking groove 19. Further, the outer diameter of the pressing member 12 is set to a size such that the outer cylindrical portion 17 is pressed against the inner peripheral surface of the burring 10c while being interposed between the small diameter cylindrical portion 14 and the outer cylindrical portion 17 of the grommet body. doing.

The pressing member 12 is composed of a pair of half-cylindrical portions 12c and 12d each having a half-split shape, and has a rear end flange portion 22.
The one end divided portion is connected via a thin hinge 23, and the other end divided portion is integrally formed with a locking portion including a lock claw 24 and a lock frame 25. The lock claw 24 and the lock frame 25 are flush with the end surface of the flange portion 22 in the locked state. In addition, at the split ends on both sides,
A slit 26 is provided that is gradually reduced from the front end flange portion 21 side toward the rear end side.

In the grommet G, the wire harness W / H is formed by pushing the small-diameter cylindrical portion 14 of the grommet main body 11 and expanding it.
4A, the tape 30 is wound around the outer peripheral surface of the small-diameter tubular portion 14 and fixed to the wire harness W / H, as shown in FIG. 4A. The pressing member 12 is attached to the rear side of the grommet main body 11 (outside the vehicle compartment A on the engine room side) by opening the half-split cylindrical portions 12c and 12d, and attaching the locking claw 24 to the lock frame 25. Insert and lock.

In this mounted state, as shown in the figure, the front end locking portion 15 of the grommet main body 11 is open outward in the radial direction. The pressing member 12 has the front flange portion 21 on the grommet body 11 side, and the small-diameter cylindrical portion 1 of the grommet body 11
At the rear position of No. 4, the wire harness W / H is slidably fitted on the outside.

In the above state, the grommet G is attached to the vehicle body panel 1.
When attaching to 0, first, the front end locking portion 15 of the grommet main body 11 is bent inward in the radial direction and inserted into the through hole 10a of the vehicle body panel 10 from the engine compartment (outside the compartment) A into the compartment B. At this time, since the front end locking portion 25 protruding outward is thin and has flexibility, the front end locking portion 25 is bent inward in the radial direction to be deformed, and as shown in FIG. Pass through. In this state, the second seal lip portion 18 contacts the outer surface 10b of the vehicle body panel 10.

Next, as shown in FIG. 4C, the pressing member 12 is attached to the grommet body 1 from the rear of the engine room A side.
It is pushed between the small diameter cylinder part 14 and the outer cylinder part 17 of 1,
The outer peripheral surface of the outer cylinder portion 17 is covered with the burring 1 of the vehicle body panel 10.
It is pressed against the inner peripheral surface of 0c. At this time, since the pressing member 12 is provided with the slit 26 that is large on the pushing side and gradually decreases, the front end flange portion 21 is easily reduced in diameter when passing through the position of the through hole 10a of the vehicle body panel 10, and thus the pressing member 12 is pressed. The material 12 can be easily pushed in.
Further, after the front end flange portion 21 has passed through the through hole 10a, the front end flange portion 21 returns to the original state and the outer cylindrical portion 17 on the outer periphery is passed through the through hole 10a.
It can be pressed toward the inner peripheral surface of the (burring 10c).

When the front end flange portion 21 is locked to the front end surface 17a of the outer cylinder portion 17, the front end locking portion 15 is pushed rearward to press the first seal lip portion 16 against the inner surface 10d of the vehicle body panel 10. . In this state, the rear end flange portion 22 of the pressing member 12 is fitted into the locking groove 19 of the outer cylindrical portion 17, the pressing member 12 is positioned and held by the grommet body 11, and the tip of the second seal lip portion 18 is Body panel outer surface 1
It is pressed against 0b. Further, the third seal lip portion 20 protrudingly provided on the outer peripheral surface of the outer tubular portion 17 is pressed against the inner peripheral surface of the burring 10c.

As described above, according to the grommet G of the present invention, the grommet body 1 fixed to the wire harness W / H.
1 is inserted into the through hole 10a of the vehicle body panel 10 and mounted,
Then, the front end locking portion 15 can be locked to the inner surface 10d side of the vehicle body panel 10 only by pushing the pressing member 12 into the grommet main body 11. At the same time, the first seal lip portion 16 can be pressed against the vehicle body panel inner surface 15d, and the second seal lip 18 is pressed against the vehicle body panel outer surface 10b. Therefore, the grommet body 11 can seal the entire inner and outer surfaces 10b and 10d of the vehicle body panel 10, and the workability of attaching to the vehicle body panel 10 can be improved. Moreover, since the third seal lip portion 20 protruding from the outer peripheral surface of the outer tubular portion 17 is pressed against the inner peripheral surface of the burring 10c, the sealing performance can be further improved.

FIG. 5 shows a grommet G of the second embodiment. The grommet G is to be attached to the vehicle body panel 10 on which the burring 10c described in the first embodiment is not formed. 17 is formed to be short in the axial direction, and the pressing member 12 is also formed to be short.

In the grommet G of the second embodiment, as in the first embodiment, the grommet main body 11 is mounted on the vehicle body panel 10 and then the pressing member 12 is pushed into the grommet main body 11. To securely seal the peripheral surface with the inner peripheral surface of the through hole 10a of the vehicle body panel 10, the first seal lip portion 16 with the inner surface 10d, and the second seal lip portion 18 with the outer surface 10b by press contact. You can

[0034]

As is apparent from the above description, in the grommet according to claim 1 of the present invention, the grommet main body fixed to the wire harness is inserted into the through hole of the vehicle body panel and mounted, and then the grommet main body is attached to the grommet main body. The front end locking portion can be locked to the inner surface side of the vehicle body panel simply by pushing in the pressing member, and at the same time, the first seal lip portion can be pressed against the inner surface of the vehicle body panel, and at the same time, the first seal lip portion can be pressed to the outer surface side of the vehicle body panel. 2 The sealing lip can be pressed. Therefore, the grommet main body can be surely brought into close contact with the entire circumference of the inner and outer surfaces of the vehicle body panel for sealing, and the workability of attachment to the vehicle body can be improved.

In the grommet according to the second aspect, since the pressing member is formed in a half-cracked shape and can be attached to the wire harness from the side, the workability can be improved.

In the grommet according to the third aspect of the present invention, the pressing member is provided with a slit having a large pushing side and a gradually decreasing size. Therefore, when the front end flange portion of the pressing member passes through the through hole of the vehicle body panel, the diameter thereof can be easily reduced. Therefore, the pressing member can be easily pushed in and attached. Also, after the front end flange passes through the through hole, it returns to the original state,
The outer peripheral outer cylinder portion can be pressed toward the inner peripheral surface of the through hole.

The grommet according to claim 4 is used for a barring projecting from the peripheral edge of the through hole of the vehicle body panel toward the outside of the vehicle compartment, and is a third seal projecting on the outer peripheral surface of the outer cylinder part. Since the lip portion is in pressure contact with the inner peripheral surface of the burring, the sealing property can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a grommet according to a first embodiment of the present invention is attached to a vehicle body panel.

2A and 2B show a grommet main body forming a grommet, FIG. 2A is a perspective view, and FIG. 2B is a sectional view.

FIG. 3 shows a pressing member that constitutes a grommet, (A)
Is a perspective view and (B) is a rear view.

4 (A), (B), and (C) are cross-sectional views showing a process of attaching the grommet to the vehicle body.

FIG. 5 is a sectional view showing a state in which the grommet of the second embodiment is attached to a vehicle body panel.

FIG. 6 is a sectional view showing a conventional grommet.

FIG. 7 is a cross-sectional view showing another conventional grommet.

FIG. 8 is a cross-sectional view showing another conventional grommet.

[Explanation of symbols]

 10 Body Panel 10a Through Hole 10b Outer Surface (Other Surface) 10d Inner Surface (One Surface) 11 Grommet Main Body 12 Pressing Material 12a Front End 12b Rear End 14 Small Diameter Tube Part 15 Front End Locking Part 16 First Seal Lip Part 17 Outer Tube Part 18 2nd Seal lip 19 Locking groove W / H Wire harness

Claims (4)

[Claims] 1. A grommet body integrally formed of rubber or elastomer and a resin pressing member, wherein the grommet body has a thin-walled small-diameter tubular portion through which a wire harness is inserted, and a front end of the small-diameter tubular portion. A thin and flexible front end locking portion having a diameter that expands outwardly more, and a first seal lip portion provided at the outer end of the front end locking portion is folded back from the rear surface side and the inside of the rear end side. A thick outer cylinder part having a locking groove on its peripheral surface and a second seal lip part that is curved forward from the outer peripheral surface of the rear end of the outer cylinder part are provided. The material has openings at both front and rear ends, and flanges project from the outer circumferences at the front and rear ends.When the grommet is attached to the vehicle body panel, the material is pushed into the small-diameter cylindrical portion of the grommet body from the front end opening, and the front end flange portion The front end face of the outer cylinder with With locking the locking portion on one side of the vehicle body panel, engages the rear end flange in the locking groove of the rear end of the outer tubular portion, the positioning and holding the grommet body,
A grommet configured to lock the second seal lip portion to the other surface of the vehicle body panel. 2. The pressing member has a half-split shape, one end divided portion thereof is connected through a thin hinge, and the other end divided portion is provided with a locking portion including a lock portion and a locked portion,
The grommet according to claim 1, which can be attached to the wire harness from the side. 3. The pressing member according to claim 2, wherein the hinge portion and the locking portion of the pressing member are provided on the rear end side, and slits that are gradually reduced along the divided end from the front end side to the rear end side are provided. Grommet. 4. A third seal lip portion protruding annularly is provided on the outer peripheral surface of the outer cylindrical portion of the grommet main body, and the third seal lip portion is provided on the inner peripheral surface of the burring projecting from the peripheral edge of the through hole of the vehicle body panel.
The grommet according to any one of claims 1 to 3, wherein the seal lip portion is in pressure contact.