JPH10255573A - Grommet for wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet excellent in waterproofness, which is mounted in a burred through hole in a vehicle body. SOLUTION: This grommet comprises an outer part 11 made of rubber and an inner part 12 made of resin, the outer part 11 comprising a small-diameter cylinder part, an increased-diameter cylinder part which increases in diameter from one end of the small diameter cylinder part, and a skirt part 11c projecting from the inner periphery of the thick-walled end face of the increased-diameter cylinder part. The end face of the increased-diameter cylinder part is formed into a sealing face 11h which is pressed into contact with a burning end, a groove 11g for locking the inner part is provided in the inner peripheral surface of the increased-diameter cylinder part, and a slit is provided in the skirt part 11c from its end. The inner part 12 is provided with a flange part 12b at one end of its cylindrical part 12a which fits into the increased-diameter cylinder part of the outer part 11, the flange part 12b is locked in the groove 11g, and a locking claw 12c is projected from the outer peripheral surface of the cylindrical part 12a and is locked to the indoor-side edge of a through hole 30a via the skirt part 11c of the outer part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet for a wire harness, and more particularly, to a grommet for a wire harness, wherein the grommet is mounted in a through-hole formed in a body of a vehicle, which separates an engine room and a room of the vehicle, through a wire harness. In a grommet for preventing water from entering the room to the room side, the grommet can be securely locked in the through hole by being inserted from one direction, and the sealing performance on the engine room side is ensured.

[0002]

2. Description of the Related Art Conventionally, in this type of grommet, as shown in FIGS. 6 to 9, an outer 1 made of an elastic rubber member is used as a grommet which is locked by simply inserting the grommet from the engine room side into a through hole of a vehicle body. There is provided a grommet G composed of two parts: an inner member 2 made of a rigid resin member.

[0003] The outer 1 is a wire harness W / H.
Small-diameter cylindrical portion 1a which is inserted in close contact with
A large-diameter cylindrical portion 1b for holding a resin component is connected to one end of the resin-diameter portion, and a seal lip 1c that is folded back from an opening end of the large-diameter cylindrical portion 1b and protrudes outward. On the other hand, the inner 2 has a large-diameter cylindrical portion 1b of the outer 1 at one end of the cylindrical portion 2a.
A flange portion 2b that fits inside is projected from the outer periphery,
A plurality of locking claws 2c protrude from the outer peripheral surface of the cylindrical portion 2a protruding from the outer 1 at intervals.

[0004] As shown in FIG. 7, the grommet G composed of the two members is assembled by firstly using a wire harness W / H.
In contrast, the outer 1 is extended through the small-diameter cylindrical portion 1a, and then the inner 2 is passed through the wire harness W / H, and the flange 2b of the inner 2 is fitted inside the large-diameter cylindrical portion 1b of the outer 1. Assembled.

When the wire harness W / H to which the grommet G is attached as described above is attached to the vehicle body, as shown in FIG.
Insert into a. The grommet G is fixed to the interior of the through-hole 3a as shown in FIG. 9 so that the locking claw 2c of the inner 2 is bent and passes through the through-hole 3a, thereby fixing the grommet G to the vehicle body 3, and In this state, the seal lip 1c of the outer 1 is in close contact with the outer surface of the vehicle body 3 on the engine room side to seal and prevent water from entering.

[0006]

The grommet G having the above structure has an advantage that the grommet G can be locked to the vehicle body by a one-way insertion work of inserting the grommet into the through hole 3a from the engine room side. At the time of mounting, there is a problem that the seal lip 1c is easily turned up, and water enters from the seal lip 1c to deteriorate waterproof performance. In addition, since the burring process cannot be performed on the through hole 3a of the vehicle body 3, the hole 3a becomes a punched hole.
The structure is easy to be flooded.

Further, there is another problem that it is difficult to determine whether the locking claw 2c is locked on the indoor side of the vehicle body 3.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in consideration of the fact that a through hole of a body of a vehicle can be attached to a body having a burring, water stopping performance is improved, and engagement with the vehicle body is confirmed. The task is to be able to do so.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a wire harness is provided in a through hole having a burring protruding outside of a vehicle body that separates the interior and exterior of an automobile from the exterior. A grommet to be inserted and mounted, an outer made of rubber or an elastomer, made of a resin-molded inner, and the outer is a small-diameter cylindrical portion to which the wire harness is tightly inserted and inserted,
The diametrically expanding cylindrical portion includes a diametrically expanding cylindrical portion that extends from one end of the small diameter cylindrical portion, and a skirt portion that protrudes from the inner periphery of the thick distal end surface of the expanding diameter cylindrical portion. In addition to the sealing surface that presses against the skirt portion, a seal projection that presses against the side surface of the burring is provided on the outer periphery of the skirt portion, and an inner locking groove is provided on the inner peripheral surface of the enlarged diameter cylindrical portion, and the skirt portion is provided. While the slit is provided from the distal end side, the inner is provided with a flange at one end of a cylindrical portion that fits inside the enlarged diameter cylinder of the outer, and is engaged with the groove on the inner peripheral surface of the enlarged diameter cylinder, A locking claw protrudes from an outer peripheral surface of the cylindrical portion, and the locking claw is provided with a through hole of the body of the vehicle body in a state in which a front end side of the outer skirt portion having a slit is turned back and interposed. Wire harness glands configured to lock to the inner periphery It has to offer Met.

In the grommet having the above structure, the grommet can be attached to the through hole of the vehicle body provided with the burring, and the sealing surface of the grommet is pressed against the distal end surface of the burring with a rigid inner, so that the grommet is pressed. Increases waterproof performance. In addition, since the skirt portion is pressed against the vehicle body by the locking claw even on the indoor side, waterproofing can be achieved at this portion.

Further, in a state where the inner flange is locked in the groove on the inner peripheral surface of the enlarged diameter portion of the outer, the inner locking claw is locked to the vehicle body, so that it is determined whether the grommet can be fixed to the vehicle body. It can be surely checked.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The grommet 10 shown in FIG. 1 is composed of two parts, an outer 11 made of rubber or elastomer and an inner 12 formed of resin, in the same manner as in the above-mentioned conventional example. A ring-shaped burring 30b protruding toward the engine room is provided on the periphery of the through-hole 30a.
Is provided. That is, the grommet 10 is attached to the burring-processed through-hole 30a.

The outer 11 is provided with a wire harness W /
A small-diameter cylindrical portion 11a through which H is inserted in close contact, and a large-diameter cylindrical portion 11b which expands in a conical cylindrical shape from one end of the small-diameter cylindrical portion 11a
And a thin skirt portion 11c protruding in a cylindrical shape from the inner peripheral edge of the distal end of the enlarged diameter cylindrical portion 11b. The outer diameter of the skirt portion 11c is set smaller than the inner diameter of the burring 30b.

The enlarged-diameter cylindrical portion 11b has a bottom wall 11d.
Is made thinner, the peripheral wall portion 11e is made thicker, a locking step 11f is formed on the smaller diameter side of the inner peripheral surface, and the inner peripheral surface extends linearly from the locking step A locking groove 11g is formed on the radial side. Further, the distal end surface of the peripheral wall portion 11e has a wide width, and is a seal surface 11h that comes into contact with the distal end surface of the burring 30b protruding from the outer periphery of the through hole 30a.

The skirt portion 11c protrudes from the inner peripheral edge of the wide end sealing surface 11h. The skirt part 1
Reference numeral 1c denotes a thin wall having a rib 11i at the tip and slits 11k cut from the tip at intervals in the circumferential direction. Further, a seal projection 11j that presses against the side surface of the burring is formed on the outer peripheral surface of the skirt portion 11c in a ring shape.

The inner member 12 made of a resin molded product has the same shape as that of the above-described conventional example, and has a flange portion 12 fitted inside one end of the cylindrical portion 12a in the enlarged diameter tube portion 11b of the outer 1.
b is projected from the outer periphery, and a plurality of locking claws 12c are projected from the outer peripheral surface of the cylindrical portion 12a at intervals.

The grommet 10 composed of the outer 11 and the inner 12 extends the small-diameter cylindrical portion 11a of the outer 11 through the wire harness W / H, and inserts the distal end of the small-diameter cylindrical portion 11a into the wire harness W / H. The tape 33 is wound around H and fixed. Next, the inner 12 is passed through the wire harness W / H and assembled.

When the inner 12 passed through the wire harness W / H is inserted into the outer 11, as shown in FIG.
1b abuts on the locking step 11f, and in this state, the locking claw 12
c is slightly locked in the locking groove 11g.

The wire harness W / H to which the grommet 10 is attached in the above-described state is inserted into the through hole 30 of the vehicle body 30.
When mounting on a, as shown in FIG. 3, it is inserted from the engine room side (X). At the time of the insertion, first, FIG.
As shown in (2), the skirt portion 11c of the outer 11 extends toward the indoor side (Y) through the burring 30b of the through hole 30a.

Further, when the wire harness W / H is pushed into the room, as shown in FIG.
The small-diameter sides of the thin-walled enlarged-diameter portion bottom wall 11d and the enlarged-diameter portion peripheral wall 11e are bent to push down the flange portion 12b of the inner 12 locked to the locking step portion 11f, and remove the locking claw 12c from the groove 11g and press down. .

Further, when the wire harness W / H is pushed in, as shown in FIG.
1 g, and the cylindrical portion 12 a of the inner 12 bends the locking claw 12 c to pass through the inner peripheral surface of the skirt portion 11 c of the outer 11, and the burring 30 b
And project to the indoor side (Y).

When the locking claw 12c of the inner 12 protrudes toward the indoor side (Y), the locking claw 12c protrudes outward, so that the skirt portion 1 of the outer 11 located on the outer periphery is formed.
1c, roll up the skirt 11c toward the outer circumference,
With the skirt portion 11c sandwiched therebetween, the skirt portion 11c is engaged with the inner peripheral edge of the through hole 30a. At that time, since the slit 11k is cut into the skirt portion 11c, the skirt portion 11c can be separated by these slits 11k and easily spread to the outer peripheral side.

As described above, after the locking claws 12c are locked to the vehicle body 30 with the skirt portion 11c interposed therebetween, when the wire harness W / H is released from being pushed, as shown in FIG. The outer 11 is restored to its original state.

When the grommet 10 is mounted in the through hole 30a having the burring 30b of the vehicle body 30 as described above, as shown in FIG.
The second flange portion 12b is fixedly pressed into the groove 11g of the outer 11 and assembled.
h is pressed against the end face of the burring 30b. Further, the seal protrusion 11j of the skirt portion 11c is pressed against the burring side surface to seal. Therefore, it is possible to reliably prevent water from entering between the burring end surface and the grommet 10. Further, since the burring 30b protruding toward the engine room is provided in the through hole 30a of the vehicle body 30, the waterproof performance is enhanced as compared with the through hole of the punched hole described in the conventional example.

The cylindrical portion 12a of the inner member 12 is burred with the skirt portion 11c of the outer member 11 interposed therebetween.
Ob protrudes to the indoor side along the inner peripheral surface, and the locking claw 12c bends the distal end side of the skirt portion 11c of the outer 11 outwardly to be locked on the indoor side peripheral edge of the through hole 30a. As described above, the rubber skirt portion 11c is brought into close contact with the inner peripheral edge of the through hole 30b by the locking claw 12c, so that waterproofing can be achieved even at this portion.

Further, in a state where the flange portion 12b of the inner 12 is locked in the groove 11g of the outer 11, the locking claw 12c of the inner 12 is locked to the peripheral edge of the through hole 30a, so that the grommet 10 is engaged with the vehicle body. The stop can be easily confirmed with a sense of moderation.

[0027]

As is apparent from the above description, according to the present invention, the grommet is inserted into the through hole of the burred body by simply operating the grommet together with the wire harness from the room side. The grommet can be locked, and the work of attaching the grommet to the vehicle body is easy.

Further, in a state where the grommet is attached to the body of the vehicle, the sealing surface of the grommet is pressed against the tip of the burring protruding to the outdoor side with a rigid inner to press the grommet against the end thereof, so that the sealing performance can be improved. It is possible to reliably prevent the ingress of water into the room.

Further, the outer is pressed to deform and the inner is passed through the through-hole, and the locking claw is locked to the inner peripheral edge of the through-hole, and the inner flange is locked in the groove of the outer at the time of the locking. Therefore, the engagement of the grommet with the vehicle body can be easily confirmed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a grommet of the present invention.

FIG. 2 is a sectional view of a main part in a state where a wire harness is inserted through the grommet.

FIG. 3 is a schematic perspective view showing a mounting direction of the grommet in a through hole of a vehicle body.

FIGS. 4A to 4D are cross-sectional views of main parts showing a process of attaching the grommet to a through hole of a vehicle body.

FIG. 5 is an enlarged sectional view of a main part in a state where the grommet is mounted in a through hole of a vehicle body.

FIG. 6 is an exploded perspective view of a conventional grommet.

FIG. 7 is a schematic view showing a method for assembling the conventional grommet.

FIG. 8 is a schematic sectional view showing a mounting direction of the conventional grommet to a vehicle body.

9A is a cross-sectional view showing a state in which the conventional grommet is mounted in a through-hole of a vehicle body, and FIG. 9B is an enlarged view of a main part of FIG. 9A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Grommet 11 Outer 11a Small diameter cylindrical part 11b Large diameter cylindrical part 11c Skirt part 11f Locking step part 11g Groove 11h Seal surface 11k Slit 11j Seal projection 12 Inner 12a Cylindrical part 12b Flange part 12c Locking claw 30 Body through hole 30b Burring W / H wire harness

Claims (1)

[Claims] 1. A grommet for inserting a wire harness into a through hole having a burring protruding to the outside of a vehicle body that separates the interior and exterior of a vehicle from a vehicle, comprising: an outer member made of rubber or elastomer; The outer is made up of a small-diameter tubular portion through which the wire harness is inserted in close contact, a large-diameter tubular portion expanding from one end of the small-diameter tubular portion, and a thicker end surface of the large-diameter tubular portion. A skirt portion protruding from the inner periphery of the skirt portion, the tip end surface of the enlarged diameter cylindrical portion is a sealing surface that is pressed against the burring tip, and a sealing projection that is pressed against the burring side surface is provided on the outer periphery of the skirt portion, In addition, while providing a groove for inner locking on the inner peripheral surface of the enlarged diameter cylindrical portion and providing a slit from the tip side in the skirt portion, the inner is provided in the outer enlarged diameter cylindrical portion. A flange portion is provided at one end of the cylindrical portion to be fitted, and is locked in the groove on the inner peripheral surface of the enlarged diameter cylindrical portion, and a locking claw is projected from the outer peripheral surface of the cylindrical portion. A grommet for a wire harness, wherein the grommet for a wire harness has a configuration in which the front end side of the outer skirt portion where the slit is inserted is folded and interposed and is engaged with the inner peripheral edge of the through hole of the vehicle body.