JPH0417890Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention consists of a grommet made of an elastic polymer material and a plurality of tubular members, and a through-hole of the grommet formed corresponding to the tubular member is connected to the grommet. The present invention relates to an improvement in a grommet having a tubular member into which the tubular member is inserted. For example, a grommet that is fitted into a hole drilled in a partition wall of a vehicle engine compartment is provided with a tubular member (hose joint) that connects a hose for taking outside air into an intake manifold.

In this specification, the explanation will be made based on such an example.

<Prior art> Grommet 1 and tubular member 15 of the above type,
17 is shown in FIG. The grommet 1 is made of synthetic rubber (elastic polymeric material) and consists of a disc-shaped base 3 and a cylindrical engagement leg 5 projecting from the bottom surface of the base 3. Then, the periphery of a hole 9 formed in a partition wall 8 of the vehicle engine compartment is fitted into an annular space 7 formed between the protrusion 6 of the engagement leg 5 and the periphery of the base 3. Also,
Through holes 11 and 13 of different diameters are formed in the base 3 parallel to the axis of the grommet 1 (vertically in the illustrated example). In addition, each through hole 11, 13 in the base 3
The periphery is thickened for reinforcement.

The tubular members 15 and 17 are straight pipes made of metal (such as steel), and are inserted into the respective through holes 11 and 13 of the grommet 1. The tubular members 15, 17 and the grommet 1 are fixed by tightly fitting the diameters of the tubular members 15, 17 and the diameters of the through holes 11, 13, and by using a metal-rubber adhesive or by vulcanization. By gluing. And, in each tubular member 15, 17,
Hoses 18 and 19 (to which negative pressure is applied) for taking outside air into the intake manifold are mounted on the outside.

<Problems to be Solved by the Invention> When the grommet 1 and the tubular members 15, 17 are assembled in the structure described above, the following problems arise.

(A) Since each of the tubular members 15 and 17 must be inserted one by one into the through holes 11 and 15 of the grommet 1, and furthermore, adhesive work must be performed, the assembly work is time-consuming.

(a) Difference in diameter of each tubular member 15, 17 (through hole 1
1 and 13) is a slight difference, etc.
Insert the tubular members 15 and 17 into the predetermined through holes 11 and 13 - Insert the small diameter tubular member 17 into each through hole 1
There is a risk that the product may be inserted into 1 or 13.

<Means for solving the problem> This invention is a brommet equipped with a tubular member made in order to solve the above-mentioned problem, and its configuration consists of a grommet made of an elastic polymer material and a plurality of tubular members. A grommet comprising a tubular member, each tubular member being inserted into a through hole of the grommet formed corresponding to the tubular member, each tubular member having a radius of Mutual peripheral walls are connected by a bridge portion formed on the same plane in the direction, and at least one of the tubular members
An engaging protrusion is formed on each circumferential wall of the grommet at an interval approximately equal to the wall thickness of the grommet from the bridge part, and each of the tubular members, the bridge part, and the engaging protrusion are integrally molded. The grommet is sandwiched between the bridge portion and the engaging protrusion when at least one of the tubular members is inserted into each of the through holes.

<Example> Hereinafter, this invention will be explained in more detail based on an example. Incidentally, the same members as in the conventional example are given the same reference numerals, and the explanation thereof will be partially omitted.

The grommet 1 of this embodiment has the same shape as that of the conventional example. This is formed by injection using a synthetic rubber material such as EPDM or an elastic polymer material such as a thermoplastic elastomer such as olefin.

The two tubular members 25 and 27 of the embodiment have external dimensions that provide a tight fit into the through holes 11 and 13 of the grommet 1, respectively. Further, the mutual peripheral walls are integrally connected by a bridge portion 29 at a slightly upper end side of the center. Thereby, the tubular members 25 and 27 to be inserted into the grommet 1 are always paired, and mistakes in insertion into the through holes 11 and 13 can be almost eliminated. This bridge part 2
9 is not particularly limited in its shape as long as it is located on the same plane in the radial direction with respect to each of the tubular members 25 and 27 so as to come into contact with the upper surface of the base 3 of the grommet 1. For example, it can be rod-shaped.

Three tubular members 35, 36, 37 to the grommet
When inserting the connector, the bridge portions 38, 39, 40, 41, and 42 are arranged as shown in FIGS. 3 and 4.
In addition, as shown by the two-dot chain line in FIG. 4, the bridge portion can be formed into a T-shape. Even if there are four or more tubular members, the same pattern as above will be obtained.

Each of the tubular members 25 and 27 is provided with an engaging protrusion 31 having a hemispherical cross-sectional shape and spaced apart from the bridge portion 29 by an interval approximately equal to the wall thickness of the peripheral edge of each of the through holes 11 and 12 of the grommet 1. , 33 are continuously bulged in the circumferential direction. Of course, this engaging protrusion may be discontinuous in the circumferential direction.

These tubular members 25 and 27 include a bridge portion 29,
The engaging protrusions 31 and 33 were injection molded from a synthetic resin material (PA, etc.). Of course, the bridge part 29
and/or the engaging protrusions 31 and 33 are connected to the tubular member 25,
It may be separate from 27. In this case, metal members can be used as the tubular members 25 and 27.

The tubular members 25 and 27 are covered with hoses 18 and 19 as in the conventional example.

When each of the tubular members 25 and 27 having such a configuration is inserted into each of the through holes 11 and 13 of the grommet 1 from the lower end thereof (since the grommet 1 has elasticity, each of the engaging protrusions 31 and 33 is inserted into each of the through holes 11 and 13). 13), the bridge portion 29 and the engaging protrusion 31,
33, the peripheral edge of each through hole 11, 13 of grommet 1 is held between them. Therefore, the grommet 1 and each tubular member 25, 27 can be fixed without any adhesive work.

In the above, it is preferable to provide the engaging protrusion on each tubular member, but as long as the grommet 1 can be held between the grommet 1 and the bridge part, it is sufficient to form it on only one of the tubular members. When three tubular members 35, 36, and 37 are provided as shown in FIGS. 3 and 4, an engaging protrusion may be formed on at least one tubular member.

Furthermore, in order to reduce the insertion load of each tubular member 25, 27 into the through hole, it is preferable to provide a tapered surface 32 on the engagement protrusion 30 as shown in FIG.

<Operations and effects of the invention> As explained above, this invention consists of a grommet made of an elastic polymeric material and a plurality of tubular members, and a through hole of the grommet formed corresponding to the tubular member is connected to the grommet. , a grommet having a tubular member configured to be inserted into the tubular member, the circumferential walls of each of the tubular members being connected to each other by a bridge portion formed on the same plane in the radial direction;
An engaging protrusion is formed on the circumferential wall of at least one of the tubular members at a distance from the bridge portion to a distance approximately equal to the wall thickness of the grommet, and the engagement protrusion is formed on the circumferential wall of at least one of the tubular members, and the engaging protrusion is formed at a distance from the bridge portion to the circumferential wall of at least one of the tubular members. The mating protrusion is integrally molded, and the grommet is sandwiched between the bridge part and the engagement protrusion when each of the tubular members is inserted into each of the through holes.

According to the grommet equipped with the tubular member having the above structure, each tubular member can be fixed to the grommet without any adhesive work by sandwiching the grommet between the bridge portion and the engaging protrusion of the tubular member. Become. Therefore, compared to the conventional example, it requires less time and effort to manufacture, and thus the manufacturing cost can be reduced. In addition, since each tubular member is interconnected by the bridge portion, multiple tubular members can be inserted through the through hole at the same time. In comparison, the number of assembly steps is reduced, manufacturing costs can be reduced, and errors in mounting the tubular member to the through hole are almost never generated.

[Brief explanation of the drawing]

FIG. 1 shows tubular members 25, 2 of an embodiment of this invention.
7 is a cross-sectional view showing a state in which the grommet 1 equipped with the grommet 7 is attached to the hole 9 of the partition wall 8 (the cutting position in the grommet 1 is indicated by the A-A indicator line in FIG. 2);
FIG. 2 is a plan view of the grommet 1 similarly equipped with tubular members 25, 27, and FIGS. 3 and 4 are grommets 1a, 1b equipped with three tubular members 35, 36, 37.
5 is a sectional view of a modified engagement protrusion 30, and FIG. 6 shows a grommet 1 equipped with conventional tubular members 15 and 17 installed in a hole 9 of a partition wall 8. FIG. 1, 1a, 1b... Grommet, 11, 13...
...Through hole, 15, 17, 25, 27, 35, 3
6, 37... Tubular member, 29, 38, 39, 4
0, 41, 42...Bridge part, 30, 31, 3
3... Engaging protrusion.

Claims (1)

[Claims for Utility Model Registration] Consisting of a grommet made of an elastic polymer material and a plurality of tubular members, each tubular member being inserted into a through hole of the grommet formed corresponding to the tubular member. The composition of
A grommet including tubular members, wherein each of the tubular members has peripheral walls connected to each other by a bridge portion formed on the same plane in the radial direction, and a peripheral wall of at least one of the tubular members,
An engaging protrusion is formed at a distance from the bridge part that is approximately equal to the wall thickness of the grommet, each of the tubular members, the bridge part, and the engaging protrusion are integrally molded, and each of the tubular members A grommet including a tubular member, wherein the grommet is held between the bridge portion and the engaging protrusion when the member is inserted into each of the through holes.