JP3361668B2 - Grommet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet capable of preventing a grommet for sealing a panel hole provided in a panel or the like from falling off a lock member by an external force applied to a wire harness.

[0002]

2. Description of the Related Art Various types of grommets have been conventionally known. For example, the actual exploitation number 59-155783
The one disclosed in Japanese Patent Publication is known. However, since the panel hole is circular in this conventional example, the conventional example shown in FIGS. 7 and 8 in which the panel hole is elliptical like the present invention will be described here. FIG. 7 is a vertical cross-sectional assembly view showing an example of a conventional grommet with a long diameter, and FIG. 8 is an operation explanatory view in FIG. 7.

As shown in FIG. 7, the grommet 51 is composed of two parts, a grommet body 56 made of a soft elastic material such as rubber and a lock member 61 made of a hard elastic material such as hard synthetic resin. The grommet main body 56 is provided with a harness support cylinder 52 for supporting the wire harness W in a watertight manner in an arbitrary direction, and an annular groove 54 formed on the inner surface of the outer peripheral portion of the base portion 53 having a shape corresponding to the panel hole 31. When,
It has a waterproof lip 55 formed toward the inside. Further, the lock member 61 has a ring plate-shaped flange portion 57 that fits in the annular groove 54.
Among the peripheral walls 58, 59 provided upright on the inner peripheral portion of 7, the peripheral wall 58
A plurality of locking claws 60 for locking the burring tip portion 32 of the panel hole 31 are provided at the inner end of the panel toward the outside.

More specifically, the grommet main body 56 is first provided with a hollow elliptical cone portion 62 for supporting the harness support cylinder 52, and a hollow elliptic cylinder portion 63 inside thereof. . Further, a sandwiching portion 64 that sandwiches the flange portion 57 and that has the annular groove 54 is provided inside thereof. The elliptic cylinder portion 63 and the sandwiching portion 64 form the base portion 53. Further, the waterproof lip 55 is integrally provided inside the sandwiching portion 64. A reinforcing rib 65 is provided on the hollow elliptical cone 62 between the harness support cylinder 52 and the elliptic cylinder 63. Further, in addition to the receiving surface 66 for receiving the burring tip portion 32 of the panel hole 31, the locking claw 60 of the lock member 61 has a higher stopper so that the receiving surface 66 does not deviate to the outer peripheral side of the panel hole 31. A section 67 is provided.

In the above structure, the wire harness W is first inserted into the harness support cylinder 52 of the grommet body 56 and the lock member 61, and then the annular groove 5 in the holding portion 64 is inserted.
The flange portion 57 is sandwiched between the four and the grommet 51 is assembled. Then, when the grommet 51 is pressed from the outside into the panel hole 31 of the panel 30, the locking claw 60 once bends toward the axial center side, but when it passes through the panel hole 31, the bending returns and the stopper portion 67 opens. It abuts on the inner peripheral portion of 31. At the same time that the receiving surface 66 is strongly locked to the burring tip portion 32, the waterproof lip 55 flexes outward and the lip portion appropriately presses the outer surface of the panel 30. 31
Is inserted in a watertight manner. In order to ensure watertightness, a tape winding is used to seal the gap between the tip of the harness support cylinder 52 and the wire harness W. Further, since the locking claw 60 bends toward the axial center when passing through the panel hole 31, the peripheral wall 58 is provided with an escape groove 68. A relief groove 69 is also provided on the peripheral wall 59 as an extension of the relief groove 68 for convenience of manufacture.

[0006]

However, in the above-mentioned conventional grommet 51, when the wire harness W is strongly pulled by the external force F as shown by the arrow in FIG. Since the ribs 65, the elliptic cylindrical portion 63, and the holding portion 64 are sequentially transmitted, the holding portion 64 and the annular groove 54 are largely distorted. Therefore, the pressing force of the waterproof lip 55 against the outer surface of the panel 30 is weakened, and there is a problem that the waterproof property is deteriorated. Also,
There is a problem in that the grommet main body 56 deviates from the lock member 61 when the external force F becomes stronger. Note that the above-mentioned problem is, for example, that the panel hole 30 is large and there is a space limitation around the place where the grommet 51 is attached due to an obstacle or the like, so that the allowance between the annular groove 54 and the flange portion 57 is sufficient. It becomes remarkable when it cannot be taken.

The object of the present invention was made in view of the above-mentioned problems. Even if the wire harness is strongly pulled by an external force, the waterproof property with respect to the panel hole is weakened or the grommet body deviates from the lock member. It is to provide a grommet that does not happen.

[0008]

The above object of the present invention is to provide a harness support tube for watertightly supporting a wire harness, and
A grommet main body made of a soft elastic material having an annular groove formed on the inner surface of the outer peripheral portion of the base having a shape corresponding to the panel hole, and a waterproof lip provided inward, and fitted into the annular groove. A plurality of locking claws that are locked to the burring tip of the panel hole at the inner end of the peripheral wall that is erected inwardly on the inner peripheral portion of the flange portion. In a grommet composed of a lock member made of a hard elastic material provided toward the outside, a proper number of pairs of columnar projections are provided at diagonal positions in the annular recessed groove, and the outer circumference of the flange portion is provided. This can be achieved by a grommet characterized in that a cylindrical concave portion that engages with the columnar convex portion is provided in the portion at a position corresponding to the columnar convex portion.

According to the grommet having the above-mentioned structure, even if the wire harness and the harness support cylinder are strongly pulled outward by the external force, the columnar convex portion is fitted and locked in the cylindrical concave portion, so that the annular concave groove is deformed. Does not come off from the flange. Therefore, the waterproof lip is not loosened and the waterproof property is not deteriorated, and the grommet body does not deviate from the lock member.

Further, since the column-shaped protrusions and the cylindrical recesses are formed in a circular cross-section, the force required to insert the cylindrical protrusions into the cylindrical recesses is reduced.
Assembly can be facilitated and work efficiency can be improved.

Further, since the cross-sectional shapes of the columnar convex portion and the cylindrical concave portion are formed in a triangular shape with the axial center side sharpened, when the triangular columnar convex portion is fitted into the triangular cylindrical concave portion, Since the fitting is made from the top portion, the fitting input becomes smaller. Further, if the triangular columnar convex portion is to be pulled out from the triangular cylindrical concave portion by an external force, it cannot be easily pulled out by the bottom portion of the triangular columnar convex portion. Therefore,
Assembling becomes easier and work efficiency is improved,
Since the grommet body cannot be easily separated from the lock member by an external force, the reliability is further improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the grommet of the present invention will be described below in detail with reference to FIGS. 1 is an exploded perspective view showing an embodiment of a grommet of the present invention, FIG. 2 is a longitudinal sectional view of assembly in FIG. 1, FIG. 3 is an operation explanatory view in FIG. 1, and FIG. 4 is a completed assembly state in FIG. FIG. 5 is a perspective view showing a modified example of the columnar convex portion and the tubular concave portion in FIG. 1, and FIG. 6 is a perspective view showing another modified example of the columnar convex portion and the tubular concave portion in FIG. is there.

As shown in FIGS. 1 and 2, the grommet 1
Is composed of a grommet body 6 made of a soft elastic material such as rubber and a lock member 11 made of a hard elastic material such as hard synthetic resin. The grommet body 6 is provided with a harness support cylinder 2 that supports the wire harness W in a watertight manner in an arbitrary direction, and has an annular groove 4 formed on the inner surface of the outer peripheral portion of the base portion 3 having a shape corresponding to the panel hole 31. And a waterproof lip 5 provided inward. The lock member 11 is provided with a ring-plate-shaped flange portion 7 that fits into the annular recessed groove 4. Inside the peripheral walls 8 and 9 provided upright on the inner peripheral portion of the flange portion 7, inside the peripheral wall 8. Panel hole 3 at the end
Plural locking claws 1 locked to the burring tip 32
0 is provided toward the outside.

More specifically, the grommet body 6 includes
First, a hollow elliptical cone portion 12 for supporting the harness support cylinder 2 is provided on the outside, and a hollow elliptic cylinder portion 13 is formed on the inside thereof, and the flange portion 7 is sandwiched inside thereof. Further, the holding portion 14 having the annular groove 4 is provided. The elliptic cylinder portion 13 and the holding portion 14 constitute the base portion 3, and the waterproof lip 5 is provided inside the holding portion 14.
Are provided integrally. In addition, the reinforcing rib 1 is provided in the hollow elliptical cone 12 between the harness support cylinder 2 and the elliptic cylinder 13.
5 are provided.

Further, the locking claw 10 of the lock member 11 has
The receiving surface 16 for receiving the burring tip 32 of the panel hole 31 and the receiving surface 16 are the panel holes 3
The stopper portion 1 is higher so that it does not deviate to the outer peripheral side of 1.
7 are provided. The peripheral wall 8 is provided with an escape groove 18 so that the locking claw 10 can be bent toward the axial center side.
Further, a relief groove 19 is further provided by extending the relief groove 18.

Further, two pairs of cylindrical projections 21 are provided integrally with the support plate 22 at diagonal positions in the annular groove 4 in the holding portion 14 of the grommet body 6. A cylindrical concave portion 23 that engages with the cylindrical convex portion 21 is provided on the outer peripheral portion of the flange portion 7 of the lock member 11.

In the present embodiment having the above-mentioned structure, the wire harness W is first inserted into the harness support cylinder 2 of the grommet body 6 and the lock member 11, and then the flange portion is formed in the annular groove 4 in the holding portion 14. 7 is clamped. At this time, as shown in FIG. 3, the holding portion 14 is extended outward, and the cylindrical protrusion 21 is aligned with the cylindrical recess 23. After that, when the columnar convex portion 21 is pressed toward the axial center side through the holding portion 14 as shown by the arrow in the figure, it is fitted into the cylindrical concave portion 23 as shown in FIG. 4 to assemble the grommet 1.

When the grommet 1 is pressed from the outside into the panel hole 31 of the panel 30, the locking claw 10 temporarily bends toward the axial center side, but when passing through the panel hole 31, the bending returns and the stopper portion 17 is formed. Is abutted on the inner peripheral portion of the panel hole 31, and the receiving surface 16 is strongly locked to the burring tip 32. At this time, since the waterproof lip 5 is bent outward and the lip portion appropriately presses the outer surface of the panel 30, the wire harness W is watertightly inserted into the panel hole 31 by the grommet 1. In order to ensure watertightness, a tape winding is used to seal between the tip of the harness support cylinder 2 and the wire harness W. Further, the locking claw 10 bends toward the axial center when passing through the panel hole 31, but does not interfere with the peripheral wall 8 because the peripheral wall 8 is provided with the escape groove 18.

According to the grommet 1 having the above-mentioned structure, the columnar convex portion 21 is fitted into the cylindrical concave portion 23 even if the wire harness W and the harness supporting cylinder 2 are strongly pulled outward by the external force, so that the clamping portion 14 is held. Further, the annular groove 4 is not deformed and does not come off from the flange portion 7. Therefore, the waterproof lip 5 is not loosened and the waterproof property is not deteriorated, and the grommet main body 6 does not deviate from the lock member 11.
The reliability of the grommet can be improved. Also,
Since the cylindrical concave portion and the columnar convex portion have a circular cross-sectional shape, a small fitting force is required when the cylindrical convex portion 21 is fitted and locked in the cylindrical concave portion 23, and the assembling work efficiency can be improved.

Further, as shown in FIG. 5, the cross-sectional shapes of the columnar protrusions and the tubular recesses are triangular with the shaft center side sharpened, and the triangular columnar protrusions 24 and the triangular tubular recesses having the support plate 25 are provided. When the triangular columnar convex portion 24 is fitted into the triangular tubular concave portion 26, the fitting input is made smaller since it is fitted from the apex portion of the triangular prism. Further, when the triangular columnar convex portion 24 is to be pulled out from the triangular cylindrical concave portion 26 by an external force, the bottom portion of the triangular columnar convex portion 24 is caught and cannot be easily pulled out. Therefore, the working efficiency of the assembly is improved, and the grommet body 6 cannot be easily separated from the lock member 11 by the external force, so that the reliability of the grommet can be further improved.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, in the present embodiment, the cylindrical convex portion 21 with the supporting plate 22 is integrally provided in the annular groove 4, but as shown in FIG. 6, the cylindrical convex portion without the supporting plate is provided. The portion 27 may be integrally provided in the annular groove 4.

[0022]

As described above, according to the grommet of the present invention, a proper number of pairs of columnar protrusions are provided at diagonal positions in the annular groove, and the columnar protrusions are provided on the outer peripheral portion of the flange portion. The corresponding cylindrical concave portion is provided at a position corresponding to the columnar convex portion. Therefore, even if the wire harness and the harness support cylinder are strongly pulled outward by an external force, the columnar convex portion is fitted into the cylindrical concave portion, so that the annular concave groove is not deformed and comes off from the flange portion. Therefore, it is possible to obtain a highly reliable grommet in which the waterproof lip is not loosened and the waterproof property is deteriorated, and the grommet body does not easily deviate from the lock member.

Further, when the columnar convex portion and the cylindrical concave portion are formed in a circular cross-section, a small fitting force is required when the cylindrical convex portion is fitted into the cylindrical concave portion, and the assembling work efficiency is improved. Can be improved.

Further, when the cross-sections of the columnar projections and the cylindrical recesses are formed in a triangular shape with the shaft center side sharpened, the fitting force is further reduced, and the triangular columnar projections are triangular cylinders due to external force. Even if it is attempted to be pulled out from the concave portion, it cannot be pulled out easily. Therefore, the working efficiency of the assembly is improved, and the grommet body cannot be easily separated from the lock member by the external force, so that the reliability of the grommet can be further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a grommet of the present invention.

FIG. 2 is a cross-sectional view showing a completed state of assembly in FIG.

FIG. 3 is an operation explanatory view in the assembled state in FIG.

4 is a cross-sectional view showing a completed state of assembly in FIG.

5 is a perspective view showing a modified example of the columnar convex portion and the tubular concave portion in FIG. 1. FIG.

FIG. 6 is a perspective view showing another modified example of the columnar convex portion and the cylindrical concave portion in FIG.

FIG. 7 is a cross-sectional view showing a conventional grommet.

FIG. 8 is an operation explanatory diagram of FIG. 7.

[Explanation of symbols]

1 Grommet 2 harness support tube 3 base 4 annular groove 5 waterproof lip 6 Grommet body 7 Flange 8 surrounding walls 10 locking claws 11 Lock member 21 Cylindrical convex portion (columnar convex portion) 23 Cylindrical recess (tubular recess) 31 panel hole 32 Burring tip W wire harness

Claims (3)

(57) [Claims] 1. A harness support cylinder for watertightly supporting a wire harness, an annular groove formed on an inner surface of an outer peripheral portion of a base portion having a shape corresponding to a panel hole, and a waterproof lip provided inward. And a grommet body made of a soft elastic material having, and a ring-plate-shaped flange portion that fits into the annular groove, at the inner end of the peripheral wall that is erected inwardly on the inner peripheral portion of the flange portion. In a grommet configured with a locking member made of a hard elastic material provided outwardly with a plurality of locking claws locked to the burring tip of the panel hole, a diagonal position in the annular groove. A suitable number of pairs of columnar convex portions are provided, and a cylindrical concave portion that engages with the columnar convex portion is provided on the outer peripheral portion of the flange portion at a position corresponding to the columnar convex portion. Grommet. 2. The cross section of each of the columnar convex portion and the cylindrical concave portion is formed in a circular shape.
Grommet described. 3. The grommet according to claim 1, wherein the columnar convex portion and the cylindrical concave portion are formed in a triangular shape in which the axial center side is sharpened.