JPH10308130A - Grommet structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve mounting workability of a grommet, secure its excellent sealability even for a curved hose or the like and eliminate its interference with other parts. SOLUTION: An outside lip 11 and an inside lip 12 are placed at the outside and the inside in relation to a body panel 1 used as a barrier plate; on the outside lip 11, after a hose 5 used as a rod-like member is inserted, a circular sealing part 14, which is bent inward so as to contact the peripheral surface of the hose 5 and hence to seal the peripheral surface, is formed; a tubular part 15 forming a space 17 around the periphery of the hole 5 in between a mounting part 13 and the inside lip 12 is provided; this tubular part 15 is fitted with a shrinked diameter part 16 having a smaller diameter locally; thus, the tubular part 15, warping the outside lip 11 and the inside lip 12 in corporation with the hose 5, is so shaped as to prevent parts other than the outside lip 11 and the inside lip 12 from interfering with the hose 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet structure which is attached to a through hole formed in a partition wall and in which a rod-shaped member continuous between the outside and the inside of the partition wall is inserted in a sealed state. It is about.

[0002]

2. Description of the Related Art FIG. 6 is a sectional view showing an outline of a conventional grommet structure applied to a body panel of an automobile. In this grommet structure, the fitting groove 3 extends over the entire outer periphery of the grommet 2 attached to the through hole 1a of the body panel 1.
First, a hose 5 whose outer diameter is slightly larger than the inner diameter of the grommet 2 is passed through the grommet 2.
a, the grommet 2 was attached to the body panel 1, and the outer peripheral surface of the hose 5 was sealed with a seal portion 4 along the inner periphery of the grommet 2.

[0003] In order to prevent intrusion of muddy water and the like from outside the vehicle, there is an interference A between the seal portion 4 of the grommet 2 and the outer peripheral surface of the hose 5 as shown in FIG. For this reason, when assembling to a motor vehicle, as shown in FIG. 8, after passing the hose 5 through the grommet 2, the grommet 2 was attached to the body panel 1. And the hose 5 is
When the hose 5 is bent as shown in FIG.
A gap S has been generated between them. Further, as shown in FIG. 10, in a grommet 7 disclosed in Japanese Patent Application Laid-Open No. 62-56685, a lip 8 is provided collectively only inside the body panel 1.

[0004]

However, in the grommet structure shown in FIG. 6, since the grommet 2 is attached to the body panel 1 after the hose 5 is passed through the grommet 2, the workability of attaching the grommet 2 is poor. This is because it is difficult to attach the grommet 2 through the hose 5 to the body panel 1. Further, as shown in FIG. 9, when the hose 5 is bent, the sealing portion 4 cannot follow the bending of the hose 5, so that there is a problem that the gap S is generated and the sealing performance is reduced. Further, in the grommet 7 shown in FIG.
When the vehicle is accelerated due to starting, braking, turning, or the like, the water W drips or the accumulated water W oozes into the vehicle and enters. Conversely, if the lip is provided only outside the vehicle, the amount of protrusion from the partition wall becomes large, which is disadvantageous in terms of space, and there is a problem of interference with other parts.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide good workability for attaching a grommet and follow a bent hose or the like. An object of the present invention is to provide a grommet structure that can ensure excellent sealing properties and does not easily interfere with other components.

[0006]

In order to achieve the above-mentioned object, the present invention has an attaching portion attached to a through hole formed in a partition, and has a continuous portion between the outside and the inside of the partition. In a grommet structure for sealing the outer periphery of the rod-shaped member, an outer lip and an inner lip are respectively disposed on the outer side and the inner side with respect to the partition wall, and the outer lip includes the rod-shaped member. The rod-shaped member is bent inward in a state where it is inserted to form an annular seal portion which abuts against the outer peripheral surface of the rod-shaped member and seals the outer peripheral surface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A grommet structure according to an embodiment of the present invention will be described in detail with reference to the drawings, taking as an example a case where a grommet for a hose is mounted on a body panel of an automobile. FIG. 1 is a longitudinal sectional view showing a grommet structure according to an embodiment of the present invention. The grommet structure according to this embodiment has a through hole 1a formed in a body panel 1 as a partition wall between the outside and the inside of the vehicle.
The grommet 10 is fitted and attached, and the grommet 10 is provided with an outer lip 11 and an inner lip 12 that are respectively disposed on the outside and the inside of the body panel 1.

The grommet structure is such that the outer lip 11 is bent inward with respect to the body panel 1 with the hose 5 which is a kind of rod-shaped member connecting the inside and outside parts (not shown) inserted therein. 5, an annular seal portion 14 is formed to abut against the outer peripheral surface of the mounting portion 1 and seal the outer peripheral surface.
Between the inner lip 12 and the inner lip 12
Is formed, and the cylindrical portion 15 is provided with a reduced diameter portion 16 having a locally small diameter. And the cylindrical part 15
Has a shape in which the portions other than the outer lip 11 and the inner lip 12 do not contact and interfere with the hose 5 in a state where the outer lip 11 and the inner lip 12 are bent together with the rod-shaped member.

The grommet 10 is made of an elastic material such as synthetic rubber, and has an outer lip 11 and an inner lip 12 outside and inside the body panel 1, an attachment portion 13 to the body panel 1, and a In a state where the hose 5 is inserted, a tube portion 15 between the inner lip 12 and the tube portion 15 is integrally provided, and a reduced diameter portion 16 having a locally small diameter is provided at an intermediate position in the axial direction of the tube portion 15. A space 17 is formed on the outer periphery of the hose 5 by the cylindrical portion 15.

FIG. 2 is a sectional view showing a state before the hose is passed through the grommet. The outer lip 11 has the thinnest thickness as compared with the cylindrical portion 15 and other portions, forms a tapered conical shape at a taper angle of approximately 45 degrees, and protrudes outward from the mounting portion 13, and has a center hole 11a. Of the hose 5 and the inner diameter of the inner lip 12 are set to be smaller. The outer lip 11 is connected to the hose 5
When the hose 5 is bent, as shown in FIG. 1, the hose 5 is bent toward the inner surface, the outer circumferential surface before bending, and the annular seal portion 14 forming the smallest inner circumferential surface after bending. It comes into fluid-tight contact with the surface and tightly seals this area.

The inner lip 12 protrudes toward the inside of the vehicle with a cylindrical portion 15 interposed between the inner lip 12 and the mounting portion 13. The inner lip 12 has an annular groove 12a on its inner periphery and annular ridges 12b on both sides thereof. The strip 12b is in fluid-tight contact with the outer periphery of the hose 5 for sealing.

The mounting portion 13 has an annular fitting groove 10a on the outer periphery.
The inner peripheral edge of the through hole 1a is press-fitted into the fitting groove 10a and fitted to the body panel 1 in a fluid-tight manner.

The cylindrical portion 15 and the space 17 in the cylindrical portion 15 are
The outer lip 11 and the inner lip 12 are bent together with the hose 5 so that portions other than the lip are not brought into contact with the hose 5. As shown in FIG. 2, the reduced-diameter portion 16 has a cross-sectional shape formed by combining circular arcs, and is dimensioned such that the minimum inner diameter is slightly larger than the inner diameter of the inner lip 12.

Next, a method of assembling each member in the grommet structure according to the embodiment of the present invention will be described with reference to FIGS. As shown in FIG.
First, the mounting portion 13 is fitted into the through-hole 1a, and the grommet 10 is independently mounted on the body panel 1. Thereafter, as shown in FIG. 3, the hose 5 is inserted into the grommet 10 so as to pass from outside the vehicle to inside the vehicle.

By inserting the hose 5, as shown in FIG. 1, the outer lip 11 bends inward to form an annular seal portion 14, which contacts the outer peripheral surface of the hose 5 outside the vehicle. The ridge 12b contacts the outer peripheral surface of the hose 5 in the vehicle, and the cylindrical portion 15 forms the space 17 in a state where the reduced diameter portion 16 is separated from the outer peripheral surface of the hose 5.

In such a grommet structure, the outer lip 1
1 inserts the hose 5 and bends inward to form an annular seal portion 14 over the entire circumference of the hose 5, and the seal portion 14 has a shape surrounding the outer periphery of the hose 5. The contact area between the hose 11 and the hose 5 increases, and the sealing performance is improved. As shown in FIG. 4, the outer lip 11 and the inner lip 12 easily follow the bending of the hose 5, and have an excellent seal against the bent hose 5 as well as the straight hose 5. Nature can be secured.

FIG. 5 is a partially cutaway side view showing a modified example of the grommet structure according to the embodiment of the present invention, and the same reference numerals are assigned to the same portions as those in the above-described embodiment. The duplicate description of the part is omitted. In the case of the grommet 20 according to this modification, two single grommets 10,
10 are connected in parallel by a connecting portion 18, and when viewed from the front or the rear as a whole, the outer shape is a long hole,
A fitting groove 20a is formed on the entire outer periphery of the two connected grommets 10, 10. By press-fitting the edge of an elongated through hole formed in a partition (not shown) into the fitting groove 20a, The grommet 20 is attached to the partition.
According to this modification of the present invention, it is possible to cope with a case where two hoses 5 are passed.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible. For example, the present invention can be widely applied to a case where the grommet 2 is attached to a through-hole of a partition other than the body panel 1 of an automobile. The rod-shaped member may be a pipe, an electric cable, an optical cable, or the like other than the hose 5. It is also possible to connect three or more grommets 10 in parallel.

[0019]

According to the present invention, an outer lip and an inner lip are provided on the outer side and the inner side of the partition wall, respectively, and the outer lip is bent inward while the rod-shaped member is inserted, and the rod-shaped member is bent. By forming an annular seal portion that abuts against the outer peripheral surface of the outer lip and seals the outer peripheral surface, the outer lip is bent inward to form the seal portion only by inserting the rod-shaped member, so that the periphery is surrounded by components. Work in narrow places is also easy, and the workability of attaching the grommet is greatly improved.Since it is sealed with two lips consisting of an outer lip and an inner lip, it has excellent sealing properties even for bent hoses. Since the lip can be secured and the lips are on the outside and the inside of the partition wall, an effect that the size can be reduced can be achieved. In addition, a cylindrical portion which forms a space on the outer periphery of the rod-shaped member between the mounting portion and the inner lip is provided, and the cylindrical portion is locally provided with a reduced diameter portion having a small diameter, and the cylindrical portion is formed together with the rod-shaped member on the outer side. The lip and the inner lip are bent so that portions other than the outer lip and the inner lip do not interfere with the bar-shaped member, so that each lip follows even when the bar-shaped member is bent, and is good. A good sealing property can be ensured, and there is no interference with other components other than the two lips, and the layout restriction is reduced. Further, since a plurality of grommets can be connected in parallel, it is possible to cope with a case where a plurality of rod-shaped members are passed, and there is an advantage that the same effect as described above can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a grommet structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a method of assembling each member in the grommet structure according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a method of assembling each member in the grommet structure according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a grommet following a bent rod-shaped member in the grommet structure according to the embodiment of the present invention.

FIG. 5 is a side view showing a modification of the grommet structure according to the embodiment of the present invention, partially cut away.

FIG. 6 is a sectional view showing a conventional grommet structure.

FIG. 7 is a cross-sectional view showing a state in which a rod-shaped member in a conventional grommet structure is not inserted.

FIG. 8 is a cross-sectional view showing a state before a rod-shaped member in a conventional grommet structure is inserted and attached to a body panel.

FIG. 9 is a cross-sectional view for explaining a problem of a grommet with respect to a bent rod-shaped member in a conventional grommet structure.

FIG. 10 is a cross-sectional view showing another conventional grommet structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body panel 1a Through-hole 5 Hose (bar-shaped member) 10 Grommet 10a Fitting groove 11 Outer lip 11a Center hole 12 Inner lip 13 Attachment part 14 Annular seal part 15 Tube part 16 Reduced diameter part 17 Space 18 Connection part 20 Grommet

Claims (3)

[Claims] 1. A partition having a mounting portion which is mounted in a through hole formed in a partition wall, wherein a continuous rod-shaped member is inserted between the outside and the inside of the partition to seal an outer periphery of the rod-shaped member. In the grommet structure, an outer lip and an inner lip are provided respectively on the outer and inner sides with respect to the partition wall, and the outer lip is bent inward with the rod-shaped member inserted so that the rod-shaped member is bent. A grommet structure characterized by forming an annular seal portion which abuts on the outer peripheral surface and seals the outer peripheral surface. 2. A cylindrical portion which forms a space on the outer periphery of the rod-shaped member between the mounting portion and the inner lip, and the cylindrical portion has a locally reduced diameter portion having a small diameter. 2. The grommet according to claim 1, wherein the outer lip and the inner lip are bent together with the rod-shaped member so that portions other than the outer lip and the inner lip do not interfere with the rod-shaped member. Construction. 3. The grommet structure according to claim 1, wherein a plurality of grommets can be connected in parallel.