JP4606798B2 - Grommet - Google Patents

Description

  The present invention relates to a grommet used for inserting a wiring or the like into a through hole of a vehicle body of an automobile.

2. Description of the Related Art Conventionally, as a grommet that is attached to a through hole formed in a vehicle body in order to pass wiring from an engine room to a vehicle interior, for example, as described in Patent Document 1, for example, a cylindrical divided body made of a hard material And a ring segment are connected by an elastic segment made of a soft elastic material.
Japanese Patent No. 3427949

  In the grommet disclosed in Patent Document 1, a divided body made of a hard material is divided into a cylindrical divided body and an annular divided body. When, for example, an insert molding method is used as a method of connecting the elastic divided bodies, a cylindrical divided body is obtained. And a two-part insert set of a ring-divided body is required, and work efficiency is poor. Moreover, although it fuse | melts at the time of elastic division body shaping | molding, it cannot be said that the adhesive strength of the soft elastic material which comprises an elastic division body, and the hard material which comprises a cylindrical division body and a ring division body is also enough.

  The present invention has been made to solve such problems, and improves workability at the time of insert molding and the like, and constitutes a soft elastic material and a cylindrical divided body or an annular divided body constituting the elastic divided body. An object of the present invention is to provide a grommet in which the adhesive strength of a hard material is reinforced.

In order to achieve the above object, the present invention provides a pair of cylindrical divided bodies made of a hard material whose dividing surfaces meet to form a substantially cylindrical body, and an outer diameter larger than the outer diameter of the cylindrical divided body. And a pair of ring divided bodies made of a hard material whose annular surfaces collide to form an annular body, the one cylindrical divided body, the one ring divided body, the other cylindrical divided body, and the above And a pair of elastic divided bodies made of a soft elastic material for connecting and integrating the other ring divided bodies, and the pair of elastic divided bodies substantially coincide with the divided surfaces of the cylindrical divided body and the ring divided body. An annular groove having a split surface and fitted with an end of an insertion hole formed in the vehicle body panel on the outer surface is provided, and the one cylindrical divided body, the one ring divided body, and the other cylinder Crosslink the divided body and the other ring divided body Ri formed by embedding the bridge portion, the bridge portion is integrally molded with the cylindrical divided body and ring split body made of a hard material and is characterized in Rukoto.

  According to the present invention, the workability at the time of insert molding is improved, for example, by reducing the number of components by cross-linking and integrating the hard material cylindrical divided body and the ring divided body by the bridging portion. In addition, since the bridging portion is embedded inside the soft elastic material constituting the elastic divided body, the adhesive strength between the soft elastic material constituting the elastic divided body and the hard material constituting the cylindrical divided body or ring divided body is also reinforced. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a cylindrical divided body and an annular divided body constituting a grommet according to an embodiment of the present invention, FIG. 2 is a partial perspective view thereof, and FIG. 3 is a perspective view showing a divided state of the grommet. 4 is a partial cross-sectional view thereof, FIG. 5 is a perspective view showing a state where the grommet is mounted on the harness bundle, and FIG. 6 is a side cross-sectional view showing a state where the grommet is assembled to the vehicle body.

  In FIG. 1, reference numerals 1a and 1b denote a pair of cylindrical divided bodies that are divided into two by a plane passing through an axis. The divided surfaces 2a and 2b abut each other and have a large diameter from the middle toward one end side. A cylindrical body is formed. 3, 3... Are locking claws integrally formed on the cylindrical end portions 2a, 2b of the cylindrical divided bodies 1a, 1b, and 4, 4 ... are the cylindrical ends of the divided surfaces 2a, 2b of the cylindrical divided bodies 1a, 1b. The locking claws 3, 3... Engage with the locking holes 4, 4. It is also possible to adopt a structure in which the coupling by this engagement can be released. The locking claw 3 and the locking port 4 constitute a lock mechanism. Such locking mechanisms are formed at four locations on the side surfaces of the cylindrical divided bodies 1a and 1b. Note that the number of lock mechanisms is not limited to four, and may be two, for example. The cylindrical divided bodies 1a and 1b are formed of a hard material such as a resin material such as polypropylene by an injection molding method or the like. Reference numerals 5 and 5 denote narrow grooves formed in the dividing surfaces 2a and 2b. As an example of the dimensions, the inner diameter of the right end in the figure is about 28 mm, the outer diameter is about 40 mm, the inner diameter of the left end is about 18 mm, the outer diameter is about 30 mm, and the right end shown in the figure is slightly larger. ing.

  6a and 6b are a pair of ring-divided bodies that are divided into two by a plane passing through the same axis as described above, and the divided surfaces 7a and 7b abut each other to form an annular body. 8 is a guide protrusion formed on the divided surfaces 7a and 7b of the ring divided bodies 6a and 6b, and 9 is a guide hole formed on the divided surfaces 7a and 7b of the ring divided bodies 6a and 6b with which the protrusion 8 faces. The guide protrusion 8 is fitted. These ring divided bodies 6a and 6b are connected by one or two connected by hinges 6c and the like, and are made of a hard material similar to the above-described cylindrical divided bodies 1a and 1b, for example, a resin material such as polypropylene by an injection molding method or the like. It is formed. An example of the dimensions is an inner diameter of about 28 mm, an outer diameter of about 71 mm, and a thickness of about 5 mm.

  In FIG. 3, 12a and 12b are a pair of elastic division bodies which connect and integrate one cylindrical division body 1a and one ring division body 6a and the other cylindrical division body 1b and the other ring division body 6b. . The elastic division bodies 12a and 12b are formed of a soft elastic material such as rubber or plastic elastomer. As an example of the material, an olefin-based or styrene-based elastomer having good compatibility with the cylindrical divided bodies 1a, 1b and the ring divided bodies 6a, 6b formed of the above-described materials can be used. The hardness can be in the range of about 30-60 JISA hardness, preferably 50 hardness. In the case of insert molding, the elastic divided bodies 12a and 12b are formed by inserting the cylindrical divided bodies 1a and 1b and the ring divided bodies 6a and 6b as inserts in a mold having a grommet-shaped cavity divided in half. The soft elastic material as described above, which is set and heated and melted, is poured into this. The resin molding technique includes a double injection method. According to this, the molding process is substantially the same as described above, but the hard material and the soft elastic material can be molded with the same mold. That is, two types of materials can be injected, and mechanical measures are taken inside the mold so that the material does not flow into the elastic divided body shape at the time of primary injection of hard material, and elasticity at the time of secondary injection of soft elastic material. Since the secondary material (soft elastic material) is considered to flow through the divided body shape portion, the insert set is not necessary.

  The elastic divided bodies 12a and 12b include disk-like portions 13a and 13b that are bonded to the ring divided bodies 6a and 6b, inclined portions 14a and 14b that are bonded to the cylindrical divided bodies 1a and 1b, respectively, It consists of annular grooves 15a and 15b formed between the portions 13a and 13b and the inclined portions 14a and 14b. The annular grooves 15a and 15b are fitted into insertion holes formed in the vehicle body panel. As shown in FIG. 6, in the vehicle body panel 16, the edge of the insertion hole 17 is bent, and the bent portion comes into contact with the bottom surfaces of the annular grooves 15a and 15b. A projecting seal having a semicircular cross section can be formed on the bottom surface. In addition, the inclined portions 14 a and 14 b are set such that the diameter of the portion (maximum diameter portion) where the annular grooves 15 a and 15 b are located is set larger than the diameter of the insertion hole 17, and the diameter of the minimum diameter portion is set smaller than the diameter of the insertion hole 17. Need to be done.

  And as shown in FIG. 4, a pair of elastic division body 12a, 12b in this embodiment comprises one cylindrical division body 1a, one ring division body 6a, the other cylindrical division body 1b, and the other ring division body 6b. Each bridge portion 18 is formed by burying a bridge portion 18 that is bent in a substantially U-shape that cross-links. The bridging portion 18 is set on the inner side in order to minimize the influence on the insertion force when the annular grooves 15a and 15b are fitted into the insertion holes 17 of the vehicle body panel 16, and FIGS. Are formed integrally with the cylindrical divided bodies 1a and 1b and the ring divided bodies 6a and 6b so that a hollow portion 18a as shown in FIG. In the present embodiment, as shown in FIG. 1, the bridging portion 18 is formed at four locations (two half-circumferences) at almost equal intervals over the entire circumference.

  Reference numerals 19a and 19b denote projecting seal bodies having a width of about 2 mm made of a soft elastic material formed on the divided surfaces 2a and 2b of the cylindrical divided bodies 1a and 1b, and the divided surfaces 2a using the narrow grooves 5 (FIG. 1). , 2b. The protruding seal bodies 18a and 18b protrude slightly from the dividing surfaces 2a and 2b, for example, about 0.5 mm. Therefore, when the cylindrical divided bodies 1a and 1b are joined, the projecting seal bodies 19a and 19b are crushed and there is no possibility that a gap is generated between the divided surfaces 2a and 2b. Reference numerals 20a and 20b denote seal tongues formed at ends opposite to the ends to which the ring segments 6a and 6b of the cylindrical segments 1a and 1b are attached. These protruding seal bodies 19a and 19b and seal tongue pieces 20a and 20b are integrally formed with the elastic division bodies 12a and 12b.

  As shown in FIG. 5, the grommet 21 having the above structure is divided and sandwiched between the wire harnesses 22, the divided bodies are brought into contact with each other, and are joined and integrated by the lock mechanism. The integrated grommet 21 is inserted into the insertion hole 17 formed in the vehicle body panel 16 from the cylindrical divided bodies 1a and 1b as shown in FIG. That is, it is inserted from the A side to the B side in the figure, and the edge of the insertion hole 17 is fitted into the annular grooves 15a and 15b of the pair of elastic division bodies 12a and 12b. By such fitting, the vehicle body panel 16 comes into close contact with the disk-like portions 13a and 13b, and the edge of the insertion hole 17 of the vehicle body panel 16 closes the annular grooves 15a and 15b. Thereby, there is no possibility that rainwater or the like enters the vehicle interior from between the grommet 21 and the insertion hole 17.

  And in this embodiment, the cylindrical part 1a, 1b of hard material and the ring division body 6a, 6b are bridge-integrated by the bridge | crosslinking part 18, and a component is reduced by one, for example, insert goods at the time of insert molding Becomes a single part, and the molding efficiency is increased and the workability is improved. Further, since the bridging portion 24 is embedded in the soft elastic material constituting the elastic divided bodies 12a and 12b, the bonding area is increased, so that the soft elastic material and the cylindrical divided body 1a constituting the elastic divided bodies 12a and 12b are increased. , 1b and the adhesive strength of the hard material constituting the ring divided bodies 6a and 6b are also reinforced.

The perspective view which shows the cylindrical division body and ring division body which comprise the grommet which concerns on one Embodiment of this invention. FIG. The perspective view which shows the division | segmentation state of the said grommet. FIG. The perspective view which shows the state which mounted | wore the harness bundle | flux with the said grommet. The sectional side view which shows the assembly | attachment state to the vehicle body of the grommet.

Explanation of symbols

1a, 1b Cylindrical divided body 2a, 2b Dividing surface 3 Locking claw 4 Locking port 5 Narrow groove 6a, 6b Ring divided body 6c Hinge 7a, 7b Dividing surface 8 Guide protrusion 9 Guide hole 12a, 12b Elastic divided body 13a, 13b Disc-like parts 14a, 14b Inclined parts 15a, 15b Annular groove 16 Car body panel 17 Insertion hole 18 Bridging part 18a Thinned part 19a, 19b Protruding seal body 20a, 20b Seal tongue 21 Grommet 22 Wire harness

Claims (1)

A pair of cylindrical divided bodies made of a hard material that abuts the divided surfaces to form a substantially cylindrical body, an outer diameter larger than the outer diameter of the cylindrical divided body, and the divided surfaces abut to form an annular body. A pair of ring divided bodies made of a hard material to be formed, a soft elastic material that connects and integrates the one cylindrical divided body and the one ring divided body, and the other cylindrical divided body and the other ring divided body. A pair of elastic divided bodies, the pair of elastic divided bodies having a dividing surface substantially coincident with each of the dividing surfaces of the cylindrical divided body and the ring divided body, and formed on the body panel on the outer surface. An annular groove in which an end edge of the insertion hole is fitted is provided, and the one cylindrical divided body and the one ring divided body, and the other cylindrical divided body and the other ring divided body are cross-linked. part SQLDESC_BASE_TABLE_NAME this buried consisting of, the bridge portion is made of a hard material The cylindrical divided body and ring split body and integrally formed grommet according to claim Rukoto made.