JPH11213785A - Joining grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the joining workability of a long joined grommet. SOLUTION: Joined grommet is constituted of a main grommet 11 made of rubber and comprising an installation part 12a in one end and a first outer cylinder part 12b in the other end and a grommet 12 for extension made of rubber and second outer cylinder part 13b connected with the first outer cylinder part 12b. In this case, engaging projected parts 12d are projected in the outer circumference of the end part of the first outer cylinder part 12 and on the other hand, openable joining pieces 13d are extended from slits 13c cut in the end part of the second outer cylinder part 13b in the longitudinal direction and engaging holes 13e to be engaged with the engaging projected part 12d are formed in the joining pieces 13d. The first main grommet 11 and the grommet 12 for extension are joined by engaging the engaging projected parts 12d with the engaging holes 13e by overlapping the joining pieces 13d of the second outer cylinder part 13b on the outer circumference of the end part of the first outer cylinder part 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting grommet for connecting two grommets to protect a wire harness in a wide range, and more particularly, to improving workability at the time of connection.

[0002]

2. Description of the Related Art Conventionally, a wire harness routed in an engine room of an automobile is protected from the outside by a rubber grommet having a bellows tube, and is waterproof and dustproof. In particular, a long section of the wire harness (for example, 30 cm
When the grommet needs to be protected by a grommet, the grommet 1 is constituted by a main grommet 2 and an extension grommet 3 connected to the main grommet 2 as shown in FIG. As described above, the connection structure of the main grommet 2 and the extension grommet 3 is adopted because, when the grommet 1 is provided on the wire harness W / H, the insertion dimension of the claw portion of the grommet expanding jig is limited. This is because long grommets cannot be used.

The main grommet 2 has a mounting portion 2a fitted into a through hole of a vehicle body panel that separates the engine room from the room.
And a first outer cylindrical portion 2b formed of a bellows tube connected to the mounting portion 2a. On the other hand, the extension grommet 3 is a second external cylinder 3 made of a bellows tube.
b, and a connecting portion 3a extending in a tubular shape from one end of the second exterior tubular portion 3b.

[0004] The grommet 1 is connected to a wire harness W / H.
7A, first, as shown in FIG. 7A, the extension grommet 3 expanded by a grommet spreading jig (not shown) is exteriorly mounted on the wire harness W / H, and the proper mounting position is set. It is located slightly behind. Next, the main grommet 2 is similarly expanded and the wire harness W / H is opened.
And is arranged at a regular position in front of the extension grommet 3 previously attached, and a tape T1 is wound around the rear end to be fixed to the wire harness W / H (FIG. 7B).
Subsequently, the main grommet 2 and the extension grommet 3 are connected by moving the connection portion 3a at the end of the extension grommet 3 to the rear end of the first exterior portion 2b and polymerizing the connection portion.
The tape T2 is wound around to prevent displacement (FIG. 7C).

[0005]

However, when the extension grommet 3 is to be pulled and moved at the time of connection with the main grommet 2, the connecting portion 3a at the tip is cylindrical and is in close contact with the wire harness W / H. Therefore, the pulling operation becomes extremely difficult. Therefore, as shown in FIG.
While the tip of a is moved outward in the direction of the main grommet 2 while being rolled up and expanded, the workability of the expansion and movement operations is extremely troublesome.

[0006]

In order to solve the above-mentioned problems, the present invention is directed to a first aspect of the present invention, wherein a mounting portion fitted to a through hole of a panel is provided at one end, and a first portion comprising a tube is provided at the other end.
A main grommet made of rubber and a rubber extension grommet provided with a second outer cylinder made of a tube connected to the first outer cylinder, A locking projection is provided on an outer periphery of an end of the first outer cylindrical portion, and a connecting piece that can be opened and closed through a slit cut in a length direction at an end of the second outer cylindrical portion. And a locking hole for engaging with the locking projection is formed in the connecting piece, and the connecting piece of the second outer cylindrical portion is superimposed on the outer periphery of the end of the first outer cylindrical portion. The present invention provides a connecting grommet that is configured to be connected by engaging a locking hole with a locking projection.

[0007] The grommet is attached to a wire harness routed to an automobile and is inserted into a vehicle body panel. Therefore, the mounting portion is fitted into a through hole of the vehicle body panel. Also, the tube is usually bellows-shaped.

According to the above construction, when the extension grommet is connected to the main grommet, the extension grommet can be pulled by picking the openable and closable connection piece through the slit. Can be.
Then, after the connecting piece is superimposed on the second outer cylinder part, the locking hole of the connecting piece is engaged with the locking projection of the first outer cylindrical part, thereby reliably preventing displacement after connection. Therefore, the operation of fixing the connecting portion by the tape can be omitted.

The connecting piece having the locking hole may be formed so as to extend to both ends of the second exterior cylinder. In this case, the direction of attachment of the extension grommet to the wire harness at the time of exterior can be eliminated.

Further, the connecting piece may be formed in a pair of half-cylinders vertically opposed to each other (claim 3). Thus, at the end opposite to the connecting portion with the main grommet, the connecting piece is adapted to the outer periphery of the wire harness, so that the tape can be fixed easily and reliably.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a connecting grommet 11 according to the present invention. The connecting grommet 11 has a connecting structure including a rubber main grommet 12 and an extension grommet 13.

The main grommet 12 is shown in FIG.
As shown in FIG. 2B, a first exterior comprising a bellows tube provided at one end with a mounting portion 12a which fits into a through hole of a vehicle body panel separating an engine room and a room, and is connected to the mounting portion 12a. A cylindrical portion 12b is provided at the other end, and the end portion is extended in a cylindrical shape to form a receiving portion 12c. on the other hand,
As shown in FIGS. 3A and 3B, the extension grommet 13 includes a second outer cylindrical portion 13b formed of a bellows tube.
And a connection portion 13a extending in a cylindrical shape from both ends of the second exterior cylinder portion 13b.

A receiving portion 12c formed at the end of the main grommet 12 is provided with a mushroom-shaped locking projection 12d integrally projecting from a circumferentially-divided position in a direction perpendicular to the length direction of the main grommet 12. Has been established. On the other hand, the connecting portion 13a of the extending grommet 13 has slits 13c formed at two locations in the longitudinal direction, and a connecting piece 13d which is separated by the slits 13c and can be opened and closed outward is formed. Locking holes 13e that engage with locking protrusions 12d of the main grommet 12 are formed in the connection pieces 13d at corresponding positions. In this embodiment, the locking projection 1
The 2d head 12d-1 has an elliptical shape, and
Although e is a circle having the same diameter as the shaft portion 12d-2 of the locking projection 12d, the shape of the locking projection 12d may be an inverted L-shape, an inverted J-shape, an arrowhead-like shape, etc. I just need.

Next, the connecting grommet 1 having the above-described structure will be described.
The step of mounting the wire harness 0 on the outer periphery of the wire harness W / H will be described. First, as shown in FIG. 4 (A), the extension grommet 3 is spread by a grommet spreading jig (not shown) to be packaged on the wire harness W / H, and is arranged at a position slightly behind the regular mounting position. I do. Then, the main grommet 1
In the same manner, the wire harness W / H is opened and the wire harness W / H is exteriorized, and is arranged at a regular position in front of the extension grommet 13 previously mounted (FIG. 4B).

Subsequently, the connecting piece 13d at the tip of the extension grommet 13 is pulled open and pulled out, and is superposed on the receiving portion 12c of the main grommet 12. At this time, since the connecting piece 13d is vertically separated by the slit 13c, it can be easily picked, and the workability of the pulling operation is good.

Next, the extension grommet 13 is connected and fixed to the main grommet 12 by engaging the locking hole 13e of the connecting piece 13d with the locking projection 12d of the receiving portion 12c. Here, the connecting piece 13d is forcibly inserted over the head 12d-1 of the locking projection 12d set to have a larger diameter than the locking hole 13e, so that the connection piece is prevented from falling off (FIG. 5).

After the connection between the main grommet 12 and the extension grommet 13 is completed as described above, the other connection piece 13d-1 formed at the other end of the extension grommet 13 is provided.
To the outer periphery of the wire harness W / H,
Grommet 11 is obtained by winding and fixing tape T3.
Complete the installation of.

[0018]

As is clear from the above description, in the connecting grommet according to the present invention, the end of the extension grommet is constituted by a connecting piece that can be opened and closed, so that the extension grommet is superimposed on the main grommet. Workability of the pulling operation at the time can be improved. Moreover, by engaging the locking holes of the connecting pieces with the locking projections of the receiving portion of the main grommet, the two can be securely connected and fixed in a state where they cannot be removed, so that tape fixing is not required and the process is simplified. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connecting grommet of the present invention.

FIG. 2A is a perspective view of a main grommet, and FIG. 2B is an enlarged view of a receiving portion.

FIG. 3A is a perspective view of an extension grommet, and FIG.
Is an enlarged view of a connecting piece.

FIGS. 4A and 4B are views showing a mounting step of a connecting grommet.

FIG. 5 is a cross-sectional view of a main part in a connected state of a main grommet and an extension grommet.

FIG. 6 is a perspective view of a conventional grommet in a mounted state.

FIGS. 7A to 7C are views showing a conventional grommet mounting process.

FIG. 8 is a diagram showing a connection processing state of a conventional extension grommet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Connection grommet 12 Main grommet 12a Attachment part 12b First exterior cylinder part 12d Locking projection 13 Extension grommet 13a Connection part 13b Second exterior cylinder part 13c Slit 13d Connection piece 13e Engagement hole

Claims (3)

[Claims] 1. A rubber main grommet having at one end a mounting portion fitted into a through hole of a panel, and a first outer cylindrical portion made of a tube connected to the other end, A rubber extension grommet provided with a second outer cylinder portion formed of a tube connected to the outer cylinder portion of the first outer cylinder portion, and a locking projection protruding from an outer periphery of an end of the first outer cylinder portion. A connecting piece that can be opened and closed extends through a slit cut in a lengthwise direction at an end of the second outer cylindrical part, and the connecting piece engages with the locking protrusion. A connection is formed in which a hole is formed, and a connection piece of the second exterior cylinder is superimposed on an outer periphery of an end of the first exterior cylinder, and the engagement projection is engaged with the engagement hole to engage the engagement projection. Grommet. 2. The connecting grommet according to claim 1, wherein the connecting piece having the locking hole is formed so as to extend to both end portions of the second outer cylindrical portion. 3. The connection grommet according to claim 1, wherein the connection piece is formed in a pair of half-cylinders vertically opposed to each other.