JPH087689A - Grommet for wire harness - Google Patents

Abstract

PURPOSE:To lock a locking pawl easily and properly in a through hole and improve stability and waterproofness of a grommet function in a grommet for a wire harness comprising a grommet main part and a hard fitting member for combining and coupling the harness with the main part. CONSTITUTION:A rotational coupling mechanism is provided in such a way that a fitting member 3 is divided into an upper fitting member 11 comprising a coupling plate 13 to be coupled with a grommet main part 2 and a lower fitting member 12 comprising a base plate 14 having a locking pawl 5 downward so that it may comprise a cross sectional L shaped female hook piece 16 and a male hook piece 17 engaging with each other as a mutual pair mounted on the lower side of the coupling plate 13 and a top side of the base plate 14 respectively. A grommet main part 2 through which the wire harness 10 is inserted is joined to the lower fitting body 23 previously cocked to the through hole 8 by coupling the upper fitting member 11 downward and the female nd male hook pieces 16 and 17 are engaged and coupled together by turning them a little and fitted to the through hole 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a wire harness penetrating a partition plate of a vehicle body / equipment and attached to a through hole portion of the partition plate to adjust the disposition posture of the wire harness. The present invention relates to a grommet for a wire harness that is used for holding and waterproofing a penetrating portion thereof.

[0002]

2. Description of the Related Art A grommet 1 for a wire harness is shown in FIG.
), The insertion tube portion 4 through which the wire harness 10 is passed in a waterproof manner.
Which has a rubber grommet main part 2 having a waterproof lip 6 on the lower end periphery and a short cylindrical hard attaching member 3 having a locking claw 5 on the lower end. The attaching member 3 And the grommet main part 2 are combined and coupled, and the engaging claws 5 are engaged and locked in the through holes 8 of the partition plate 7 of the vehicle body / equipment to be fixedly attached to the peripheral edge of the through holes 8, and the insertion tube part 4 The wire harness 10 inserted into the through hole 8 is held by being penetrated into the through hole 8 and the waterproof lip 6 is pressed against the peripheral edge of the through hole 8 to waterproof the through hole 8 portion. Reference numeral 21 in the drawing denotes a coupling recess of the grommet main portion 2, and 22 denotes a coupling flange of the attachment member 3 fitted in the coupling recess 21.

[0003]

In the wire harness grommet 1 having the above-described conventional structure, the grommet main portion 2 and the attaching member 3 are combined and attached to the wire harness 10.
Hold it by hand and press it against the through hole 8,
Since it will be work to engage and lock with the hole edge of
At the time of pressing and locking, the resistance force of the locking claw 5 engaging with the hole edge and the resistance force of strongly pressing the waterproof lip 6 against the partition plate 7 due to the engagement locking are simultaneously applied to the hand, The sensory judgment as to whether or not the locking claws 5 normally mesh and lock is made extremely difficult, and the feeling of locking the through holes 8 is poor.

Then, the manual mounting is performed, for example, by
In the production line of automobiles, since the work is performed with extremely fast work tact, the locking claws 5 are not properly fitted to the hole edges and the fitting is insufficient, that is, the waterproof lip 6 is insufficiently pressed against the partition plate 7. There is a drawback that a defective waterproof product is produced. The present invention provides a grommet for a wire harness that solves the above-mentioned drawbacks of the prior art.

[0005]

The wire harness grommet according to the present invention which solves the above technical problems is "elasticity having an insertion tube portion through which a wire harness is inserted at the upper side and a waterproof lip provided at the lower end periphery. Of the grommet main part and a mounting member of a hard short cylinder which has a locking claw below and is coupled with the grommet main part. The locking claw is locked to the hole edge of the through hole of the vehicle body / device. In addition, in the wire harness grommet to which the waterproof lip is attached by pressure contact with the peripheral edge of the through hole, the attachment member, an upper attachment body that has the waterproof lip and is coupled to the grommet main portion, A rotary coupling mechanism that is divided into a lower attachment body having locking claws, and is joined to a joint portion of the upper attachment body and the lower attachment body by relative rotation of the upper attachment body and the lower attachment body. Has a structure " There.

That is, in the wire harness grommet of the present invention, the attachment member is divided into an upper attachment body and a lower attachment body, and the lower attachment body is preliminarily attached to the through hole and locked.
The lower attachment body in the locking posture is connected to the grommet main part which is attached to the wire harness and is connected to the upper attachment body, which enables a two-stage attachment method for attaching to the through hole portion. The rotary coupling mechanism that couples the upper and lower attachments to each other has an L
A mode is adopted in which a female hook piece and a male hook piece having a V-shaped cross section are formed as a pair, and the upper and lower attachment bodies are joined and mutually rotated by a slight amount of relative rotation, and further, the lower attachment body,
By attaching a seal ring that presses against the periphery of the through hole, the first sealing point by the waterproof lip of the grommet main part,
The seal ring may have a double seal structure with a second seal point.

[0007]

The grommet for a wire harness of the present invention having the above-described structure is composed of a grommet main part and an attaching member, and the attaching member is divided into an upper attachable body and a lower attachable body which are freely connectable to each other. Since the above-mentioned two-stage mounting method in which only the attaching body is preliminarily attached and locked in the through hole can be adopted, when only the lower attaching body is attached and locked in the through hole, the resistance force that excessively presses the waterproof lip. Is not present, and there is only the locking resistance of the locking claw, so the locking feeling is good,
It is possible to accurately make a sensory judgment as to whether or not the locking claw is normally locked.

When the upper attaching body connected to the main part of the grommet is connected to the lower attaching body in the locked state,
Since they can be joined mechanically by simply joining them and rotating them a little, a series of attaching work to the through hole part of the wire harness grommet becomes simple and accurate,
The risk of locking failure in the conventional structure is extremely low. Further, in the case where the lower attachment body is provided with the seal ring, the double seal structure is provided, so that the sealing property of the site is further improved and stabilized.

[0009]

Embodiments will be described in detail below based on embodiments. First, referring to FIG. 1 showing a first embodiment of the present invention, a rubber material having an insertion tube portion 4 through which a wire harness 10 is waterproofly inserted and having a waterproof lip 6 annularly provided at a lower end periphery thereof. Of the rigid short tubular body in which the grommet main portion 2 and the locking claw 5 that engages with and engages with the hole edge of the through hole 8 of the partition plate 7 of the vehicle body are projected on the lower outer periphery and combined with the grommet main portion 2. In the wire harness grommet 1 which is composed of the attachment member 3 and is waterproofly attached to the periphery of the through hole 8 by pressure contact with the peripheral edge of the through hole 8, the attachment member 3 and the upper attachment body 11 of separate bodies are coupled to each other. The lower attachment body 12 is divided.

More specifically, the upper attachment body 11 is fitted in a U-shaped groove-shaped coupling concave portion 21 which is circumferentially provided around the lower end portion of the grommet main portion 2, and is coupled to the grommet main portion 2 in a donut-shaped coupling plate. The lower attachment body 12 comprises a doughnut-shaped substrate 14 concentrically overlapped with the upper attachment body 11.
And a short cylindrical body portion 15 hung vertically on the base plate 14, and locking claws 5 scattered in the circumferential direction are provided on the outer periphery of the body portion 15 so as to project outward from the body portion 15. ing.

Then, the upper and lower attachments 11 and 12
On the lower surface of the coupling plate 13 and the upper surface of the substrate 14 which are superposed on each other, the circumference is concentric with the coupling plate 13 and the substrate 14, and the circumference is equally divided, and four protrusions are provided for each. Female hook piece 16 and male hook piece 1 having an L-shaped cross section that are engaged with each other and locked.
7 are formed so as to face each other, and the male and female hook pieces 16 and 17 constitute a rotary coupling mechanism of the upper attachment body 11 and the lower attachment body 12. Reference numeral 23 in the drawing denotes a hole when the female hook piece 16 is press-molded.

Then (see (C) and (D) of FIG. 1), the upper and lower attachments 11 and 12 are opposed to each other, and the female hook piece 16 is inserted into the nonexistent portion of the male hook piece 17 on the other side. And the connecting plate 1
3 and the substrate 14 are concentrically aligned and combined, and then by relatively rotating, the male and female hook pieces 16 and 17 are engaged with each other, and the upper and lower attachment members 11 and 12 are polymerized without rattling. The structure is such that they are joined together to form an attachment member 3 of an integral body.

A seal ring 18 is attached to the peripheral portion of the lower attachment body 12 on the back side of the substrate 14, and the locking claw 5 of the lower attachment body 12 is normally attached to the edge of the through hole 8. , The seal ring 18 is sandwiched between the base plate 14 and the partition plate 7, and the second seal point 20 at the through hole 8 site is secured.
Are formed. In addition, the male and female hook piece 1 described above
Although not shown, 6 and 17 are provided with a rotation lock means including a locking projection and a locking groove which are engaged with each other to stop rotation when they are normally fitted and coupled to each other.

In the wire harness grommet 1 of the embodiment shown in FIG. 1 described above, the lower attachment body 12 in the separated state is attached to the through hole 8 in advance, and the locking claws 5 are locked to the edge of the hole to bring the wire harness into a normal posture. It is locked and fixed. After that, the grommet main part 2 in which the wire harness 10 is inserted into the insertion tube part 4 and the upper attachment body 11 is connected is set to the lower attachment body 12 in the locking posture, and the grommet main part 2 is waterproofed. Lip 6 through hole 8
While being pressed against the peripheral edge of the seal ring 18, the seal ring 18 is sandwiched between the partition plate 7 and the lower attachment body 12, and attached and fixed to the through hole 8.

The above-described embodiment of FIG. 1 has the above-mentioned action, and the lower attachment body 12 which is previously locked in the through hole 8 is a single member, and the locking claw 5 engages with the hole edge. Since it only occurs, it can be locked with a "pachin" simply by inserting it into the through hole 8 and pressing it, and there is a very good locking feeling, and it is possible to make an accurate sensory judgment as to whether or not it has been correctly locked. . When the upper attachment body 11 is joined to the lower attachment body 12 in the locking posture, the two can be joined accurately by simply joining them and simply rotating them relative to each other. At the same time, the double seal structure by the second seal point 20 further improves the waterproof property of the portion of the through hole 8 and stabilizes it.

Next, another embodiment of the present invention will be described with reference to FIG. That is, as in the embodiment of FIG. 1, the one shown in FIG. 2 has a rotary coupling mechanism of the upper attachment body 11 and the lower attachment body 12 which are L-shaped female and male hook pieces 16 and 17, and has a male and female hook. For example, the height H of the male hook piece 17 is set in the direction of engagement (shown by H1 in the figure) so that the engagement start points of the pieces 16 and 17 are loosely engaged and the end points of engagement are strongly engaged.
To H2 in the drawing).

According to the embodiment, the male and female hook pieces 16
Since there is a lot of clearance clearance at the meshing start point of 17, the pressing resistance of the waterproof lip 6 due to the meshing is small, and the upper and lower attachment bodies 11 and 12 are easily coupled. At the end of the meshing, the two are meshed without rattling, and sufficient pressure contact of the waterproof lip 6 with the partition plate 7 can be achieved very easily by the relative rotation of the upper and lower attachment bodies 11 and 12.

The wire harness grommet of the present invention is not limited to the above embodiment, and as shown in FIG.
The male hook piece 17 of the lower attaching body 12 that engages with the L-shaped female hook piece 16 of the upper attaching body 11 is formed in a tongue shape protruding outward, and the tongue-like male hook piece 17 and the base plate 14 are formed. In the gap between
There are changes such as a shape for receiving the female hook piece 16.

[0019]

As described above, the wire harness grommet of the present invention has a grommet main portion having a waterproof lip that comes into pressure contact with the peripheral edge of the through hole of the vehicle body / device, and a locking claw to the through hole. In the one that is combined with the attachment member, it can be accurately determined whether or not the locking claw has normally locked, so it prevents the occurrence of defective products with imperfect locking in the through hole, and has a grommet function. With good stability,
The attachment member allows the second seal point to be provided side by side, which has the effect of further improving and stabilizing the waterproofness of the through-hole portion.

[Brief description of drawings]

FIG. 1 shows a wire harness grommet of a first embodiment of the present invention, in which (A) is a perspective view of its constituent members, (B) is a front sectional view of its attaching member, and FIG. (C) is a plan view showing a method of connecting the attachments to each other, and (D) in the drawing is a front sectional view showing a state where the attachments are attached to the through holes.

FIG. 2 is a partial perspective view of an attachment body of a grommet for a wire harness according to another embodiment of the present invention.

FIG. 3 is a perspective view of a wire harness grommet attachment according to another embodiment of the present invention.

FIG. 4 is a front sectional view of a conventional wire harness grommet attached to a through hole.

[Explanation of symbols]

 1 Wire Harness Grommet 2 Grommet Main Part 3 Attachment Member 4 Insertion Pipe Part 5 Locking Claw 6 Waterproof Lip 7 Separator Plate 8 Through Hole 10 Wire Harness 11 Upper Attachment Body 12 Lower Attachment Body 13 Coupling Plate 14 Board 15 Body Part 16 Female hook piece 17 Male hook piece 18 Seal ring 20 Second seal point 21 Coupling groove

Claims (4)

[Claims] 1. An elastic grommet main part having an insertion tube part through which a wire harness is inserted at an upper part and a waterproof lip provided at a lower end peripheral edge, and an engaging claw below and combined with the grommet main part. Grommet for a wire harness, which is made of a hard short tubular attachment member, which locks the locking claw to the hole edge of a through hole of a vehicle body / device and attaches the waterproof lip to the peripheral edge of the through hole by pressing. In, the attachment member,
The upper attaching body having the waterproof lip and coupled to the main part of the grommet and the lower attaching body having the locking claws are divided, and at the joint portion of the upper attaching body and the lower attaching body, A grommet for a wire harness having a structure provided with a rotary coupling mechanism for mutually coupling by relative rotation of the upper attachment body and the lower attachment body. 2. A female hook piece and a male hook piece each having an L-shaped cross section and engaging with each other on the joint surface of the upper attachment body and the lower attachment body are circumferentially divided at intervals. The grommet for a wire harness according to claim 1, wherein the grommet comprises an upright rotary coupling mechanism. 3. The height of at least one of the female hook piece and the male hook piece has a slope shape that gradually decreases from the meshing start point to the meshing end point, and the female hook piece and the male hook piece have The grommet for a wire harness according to claim 2, wherein the mutual fitting is loose fitting at the meshing start point and strong fitting at the meshing end point. 4. The lower attachment body is provided with a seal ring which is sandwiched between the peripheral edge portion of the lower attachment body and the peripheral edge portion of the through hole in a state where the lower attachment body is normally locked. 1
Alternatively, the grommet for a wire harness according to claim 2 or claim 3.