JPH0325670B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is designed to be inserted and fixed into a through-hole formed in a panel member such as a metal plate or a glass plate, and to seal various hoses, cables, etc. that are inserted through the through-hole. Regarding improvements to grommet.

Conventional technology For example, when various hoses, cables, etc. are installed through an automobile body panel, etc., grommets made of an elastic material such as rubber are generally used to protect the hoses and ensure a seal. (See, for example, Japanese Utility Model Application Publication No. 56-8987, etc.).

FIG. 4 shows an example of a conventional grommet 11. This grommet 11 has a flange-shaped base 13 that contacts the back surface of a panel member such as a vehicle body panel 12.
It also has a panel holding part 14 that protrudes relatively largely toward the outer periphery, and a panel fitting groove 15 is formed between the two. A tapered cylindrical portion 16 is formed continuously to the panel holding portion 14, and its tip is pressed against a rod-shaped body, for example, a hose 17 made of synthetic resin, for sealing.

That is, this grommet 11 is inserted into the through hole 12a of the vehicle body panel 12 from the back surface (lower side in the figure) of the vehicle body panel 12, and by pushing it upward in the figure, the grommet 11 is inserted into the vehicle body in the state shown in the figure. It is adapted to be attached to the panel 12.

Problems to be Solved by the Invention However, in the above conventional configuration, the base 13
Since the body panel 12 is held only by the rigidity of the panel holding part 14, when a pulling force is applied to the grommet 11 from the base 13 side, the panel holding part 14 easily deforms and falls off from the car body panel 12. Easy to do. In addition, in order to prevent such falling off, it is necessary to make the panel holding part 14 protrude relatively largely toward the outer circumferential side and increase the rigidity by making it thick.
It becomes difficult to push it in, and the workability during installation deteriorates. In addition, since the hose 17 and the like are sealed only at the tip of the cylindrical portion 16, the sealing performance is poor, and especially when the hose 17 and the like are inserted obliquely to the axis of the grommet 11, the grommet 11 There is also the problem that the sealing performance is significantly deteriorated due to the inability to follow the pattern.

Means for Solving the Problems In order to solve the above problems, the grommet according to the present invention has a panel fitting between the flange-shaped base that contacts the back surface of the panel member and the panel holding part that protrudes toward the outer periphery. A mating groove is formed, and a bulge portion is formed on the inner peripheral side of the panel holding portion to press against the rod-shaped body, and the cylindrical portion is formed into an annular shape having a substantially circular cross section and press-contacted to the rod-shaped body. It is characterized by comprising a plurality of continuous seal parts and a thin flexible part which sequentially connects these seal parts and the panel holding part.

Function The grommet described above is inserted into the through hole from the back side of the panel member, and the opening edge of the panel member is fitted into the panel fitting groove due to the elastic deformation of the panel clamping part. . If the rod-shaped body is inserted into the grommet in this manner, the bulge will come into pressure contact with the rod-shaped body, producing a sealing effect, and the panel holding portion will be firmly supported from the inner circumferential side. As a result, its elastic deformation is prevented. Therefore, even if a pull-out force is applied from the outside, it will not fall off. In addition, the sealing portions having a substantially circular cross section press against the rod-shaped body at a plurality of locations, and together with the bulging portion, effective sealing can be achieved, and the flexible portion in the middle allows for good tracking of the inclination of the rod-shaped body.

Embodiment FIG. 1 shows an embodiment of a grommet 1 according to the present invention. This grommet 1 is integrally molded, for example, from rubber, and has a flange-like base 3 at the base end of a cylindrical part 2, and a panel holding part adjacent to this base 3 and protruding toward the outer periphery. 4 is formed in an annular shape, and a panel fitting groove 5 is formed between the two. The panel holding portion 4 has a semicircular cross section in order to facilitate attachment and detachment to the vehicle body panel 12, and the amount of protrusion toward the outer circumference thereof is relatively small. Further, on the inner peripheral side of this panel holding part 4, a bulging part 6 having a semicircular cross section is formed in an annular shape. That is, the panel holding part 4 and the bulging part 6 are formed to have a substantially circular cross section. The inner diameter of the bulged portion 6 is set to be slightly smaller than the outer diameter of the hose 17 and the like inserted therein.

Further, the cylindrical portion 2 includes two annularly continuous seal portions 7 and 8 having a substantially circular cross section, and thin flexible portions 9 and 10 provided between these and between the panel holding portion 4. The seal portions 7, 8
Similar to the bulging portion 6, the inner diameter of the tube is set to be slightly smaller than the outer diameter of the hose 17, etc., so as to be in pressure contact with the hose 17, etc. inserted therein.

FIG. 2 shows a state in which the grommet 1 constructed as described above is inserted and fixed into the through hole 12a of the vehicle body panel 12, and the hose 17 is inserted therethrough. To attach this grommet 1 to the vehicle body panel 12, insert the through hole 12 from the back side of the vehicle body panel 12.
The panel holding portion 4 is elastically deformed toward the inner circumferential side relatively easily, so that it can be mounted extremely easily. Then, when the hose 17 is inserted thereafter, the panel holding part 4 will be in a state in which it is slightly expanded toward the outer circumferential side via the bulging part 6.
Therefore, in this state, even if the grommet 1 is subjected to a pulling force, it will never fall off.

Further, the hose 17 is not only double sealed at the seal portions 7 and 8, but also sealed at the bulge portion 6, resulting in extremely high sealing performance. Each seal portion 7, 8 has a flexible portion 9, 10.
Since the hose 17 is supported flexibly by
Even if it is inclined with respect to the vehicle body panel 12,
Following this, it is possible to reliably seal.
The inner diameter of the seal part 7 on the distal end side is made slightly smaller than the inner diameter of the seal part 8 on the proximal end side to improve adhesion on the distal end side where gaps are likely to occur when the hose 17 is inclined. ing.

Next, in the embodiment shown in FIG. 3, the flexible portions 9' and 10' of the cylindrical portion 2 are actively shaped into bellows shapes to further enhance the ability to follow the bent hose 17.

Effects of the Invention As is clear from the above explanation, the grommet according to the present invention does not fall off from the panel member even when subjected to a large external force when a hose, cable, etc. are inserted. Further, since the amount of protrusion of the panel holding portion itself is relatively small, and there is no need to particularly increase the rigidity, attachment/detachment work becomes extremely easy. Further, since the bulge becomes part of the seal for the hose etc., an excellent sealing effect can be obtained.

In addition, since multiple seal parts with a substantially circular cross section are connected by a thin flexible part, even when hoses, cables, etc. are installed at an angle to the grommet, they can be easily tracked and the sealing performance can be improved. There is no decrease in

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the grommet according to the present invention, FIG. 2 is a sectional view showing the grommet in its installed state, FIG. FIG. 3 is a sectional view showing a grommet. DESCRIPTION OF SYMBOLS 1... Grommet, 2... Cylindrical part, 3... Base, 4... Panel holding part, 5... Panel fitting groove,
6...Bulging part, 7, 8... Seal part.

Claims (1)

[Claims] 1 In a grommet made of an elastic material that is inserted and fixed into a through hole formed in a panel member and has a cylindrical part that seals a rod-shaped object such as a hose, a flange-shaped base that contacts the back surface of the panel member and a flange-like base that protrudes toward the outer periphery. A panel fitting groove is formed between the panel clamping part, a bulge part is formed on the inner peripheral side of the panel clamping part to press against the rod-shaped body, and the cylindrical part is connected to the rod-shaped body. 1. A grommet comprising a plurality of annularly continuous seal portions having a substantially circular cross section that press against the panel, and a thin flexible portion sequentially connecting these seal portions and the panel holding portion.