JPH07336068A - Grommet for wire harness - Google Patents

Abstract

PURPOSE:To enhance the attachment of a grommet to an attaching hole, and to improve the workability, the work efficiency and the safety of work by making V- or U-shaped diameter-decreasing notches in the inner surface of a partition board attaching part the notches, extending in the direction of wire harness insertion and opening to the front end of an inner surface. CONSTITUTION:Diameter-decreasing notches 8 have V-shaped cross sections, and extend in the direction insertion of a wire harness 1. Front edges 9 of the notches 8 open to the front end of the partition board attaching part 3. The notches 8 have necessary depths and lengths, and are arranged at equally- spaced circumferential positions. To install a partition board attaching part 3 to a partition board 6, an insertion pipe part 2, that is inside an engaging hole 7, is pulled in. When the partition board attaching part 3 receives a force in the ridial direction toward its center, the V-shaped diameter decreasing notches 8 deform elastically and the notches 8 are closed, and the outer diameter D of the partition board attaching part 3 is decreased. Thus, the installation of the grommet to the engaging hole of a car body or a device becomes easier, and the workability and the work efficiency are improved.

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 to adjust and maintain the penetrating position of the wire harness and to waterproof the penetrating portion. The present invention relates to a grommet for a wire harness used for.

[0002]

2. Description of the Related Art A wire harness grommet (see FIG. 2) is fitted in a small-diameter insertion tube portion 2 through which a wire harness 1 is inserted and held in a waterproof state, and a fitting hole 7 of a partition plate 6 such as a vehicle body. A funnel in which a U-shaped fitting groove 5 for locking is provided around the outer circumference and a large-diameter ring-shaped partition plate attaching portion 3 for allowing the wire harness 1 to pass through is inserted in the hollow portion 4 in the central portion. By making the fitting groove 5 of the partition plate attaching portion 3 into the fitting hole 7 of the partition plate 6 by force, the wire harness 1 is maintained in the partition plate penetrating posture and the penetrating portion thereof. The structure is designed to be waterproof.

[0003]

In the wire harness grommet having the above-described conventional structure, the outer diameter D2 of the partition plate attachment portion 3 on the side to be inserted into the fitting hole 7 is larger than the hole diameter D1 of the fitting hole 7. Since the partition plate attaching portion 3 which has the relative shape and is forcibly fitted into the fitting hole 7 is a ring-shaped body having a considerably large thickness, the partition plate attaching portion 3 is forcibly fitted at the time of the forced fitting. The ring diameter is pressed down by the edge of the fitting hole 7 that is pressed against the outer circumference, and the work is carried out by forcibly reducing the diameter by a uniform pressing load on the circumference.

Since the reducing force has to rely only on the component of the pulling force of the wire harness grommet into the fitting hole 7, an extremely large work force is required and workability
When the fitting hole 7 has a large diameter, the work efficiency is low and there is a safety problem such as damage to the hands. When the fitting hole 7 has a large diameter, a lubricant is applied to the outer periphery of the grommet to mitigate the sliding resistance with the fitting hole 7. There is a problem that you have to do the fitting work. The present invention provides a grommet for a wire harness that solves the above-mentioned drawbacks of the prior art.

[0005]

The grommet for a wire harness of the present invention, which solves the above technical problems, is "a small-diameter insertion tube portion through which a wire harness is inserted, and a wire harness is loosely inserted into a hollow portion of a central portion. And a funnel-shaped wire harness in which a partition attachment part of a large-diameter ring body having a U-shaped fitting groove that fits in a fitting hole of a partition plate of a vehicle body / equipment is provided around the outer periphery is connected. In the grommet for use, a V-shaped or U-shaped diameter-reducing notch for extending in the insertion direction of the wire harness and having an end opening at the front edge of the inner periphery is provided on the inner periphery of the partition plate attachment portion, It has a structure in which multiple pieces are scattered.

That is, when the partition plate mounting portion is forcibly fitted into the fitting hole, the notch for reducing the diameter has a gap formed by the notch for reducing the diameter, which is a flexible gap of elastic contraction of the partition member mounting portion. It has a length and depth that take into account the diameter reduction allowance.

[0007]

In the wire harness grommet of the present invention having the above-described structure, since the diameter reducing cutout is present, the hole edge of the fitting hole is pressed against the outer periphery of the partition plate mounting portion to remove the partition plate. When the attachment part receives a pressing force toward the center of the annulus, the open notch for reducing the diameter elastically deforms and closes.Therefore, the annular part of the partition plate attaching part between the notches for reducing the diameter is impossible. Even if it is not elastically compressed and deformed, the entire partition plate attachment portion is in a reduced diameter state, and can be easily inserted and fitted into the fitting hole. Then, when the fitting groove of the partition plate mounting portion is fitted into the fitting hole by the insertion fitting, the V-shaped / U-shaped closing notch for reducing the diameter is compressed by the edge of the fitting hole. When opened, the partition plate attachment portion, which is elastically expanded, is fitted and locked in the fitting holes on the vehicle body / device side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below in detail with reference to FIG. That is, a small-diameter insertion tube portion 2 that is pressed against the outer periphery of the inserted wire harness 1 and is waterproofly inserted and held.
And a large-diameter ring-shaped partition plate around which the wire harness 1 is passed through the hollow portion 4 and a U-shaped fitting groove 5 which is fitted into the fitting hole 7 of the partition plate 6 of the vehicle body is provided around the outer circumference. In the wire harness grommet in which the attachment portions 3 are connected in a funnel shape, a notch 8 for reducing the diameter, which will be described in detail below, is formed in the inner periphery of the partition plate attachment portion 3.

That is, the diameter reducing notch 8 has a V-shaped cross section and extends in the insertion direction of the wire harness 1, and the notch front end 9 is opened at the front end of the partition plate attachment portion 3 to have a required depth and length. And is arranged at a position that divides the circumference into four equal parts. And
In order to attach the partition plate attachment part 3 to the partition plate 6, the insertion tube part 2 put in the fitting hole 7 is pulled in, and the outer periphery of the partition plate attachment part 3 interferes with the hole edge of the fitting hole 7, When the partition plate attachment portion 3 receives an external force directed toward the center due to the fitting hole 7, the V-shaped diameter reducing notch 8 easily elastically bends to V as shown in FIG. 1C. The character is closed, and the outer diameter D of the partition plate attachment portion 3 is in a state of being elastically reduced.

In the embodiment described above, even if the usual annular body portion 10 between the diameter-reducing notches 8 is not forcibly reduced in diameter, the partition plate attachment portion 3 is substantially closed by elastically closing the diameter-reducing notches 8. The target outer diameter can be reduced to be fitted and set in the fitting hole 7. Therefore, as compared with the conventional structure, the work of fitting into the fitting hole 7 becomes particularly easy, and even in the case of the large-diameter partition plate mounting portion 3, the application of the lubricant becomes unnecessary, and By simplifying the work, it is possible to eliminate the risk of damaging the fingertip or the like.

The wire harness grommet of the present invention is not limited to the embodiment shown in FIG. 1, and the diameter reducing notch 8 may have a U-shaped cross section and the number of the notches 8 may be any other than four. Is adopted.

[0012]

As described above, the wire harness grommet of the present invention is extremely easy to fit and fit into the fitting holes of the vehicle body / device, and improves its workability and work efficiency. It has the effect of improving work safety.

[Brief description of drawings]

FIG. 1 shows a grommet for a wire harness according to an embodiment of the present invention, in which (A) is a perspective view thereof, (B) is a front sectional view showing its usage state, and (C) is a drawing. Is a side view showing its working state

FIG. 2 is a front cross-sectional view showing the structure and usage of a conventional wire harness grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire harness 2 Insertion pipe part 3 Separator plate attachment part 4 Hollow part 5 Fitting groove 6 Septum plate 7 Fitting hole 8 Cutout for diameter reduction 9 Cutout front end 10 Ring part between cutouts for diameter reduction

Claims (1)

[Claims] 1. A U-shaped groove for inserting a wire harness into a fitting hole of a partition plate of a vehicle body / equipment by allowing the wire harness to pass through a hollow portion in a central portion of the insertion pipe portion. In a funnel-shaped wire harness grommet in which a partition plate attachment portion of a large-diameter ring body having a fitting groove on the outer periphery is continuously provided, in the inner periphery of the partition plate attachment portion, the insertion direction of the wire harness A grommet for a wire harness, which has a structure in which a plurality of V-shaped or U-shaped diameter-reducing notches that extend to the front and open at the front edge of the inner circumference are scattered.