JPH11346422A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grommet, which can adhere tightly to a wiring harness which has a different outer diameter and is inserted into its cylindrical wiring harness holding parts to be held and can hold the wiring harness with high waterproofness, while the deterioration of working efficiency is suppressed. SOLUTION: A grommet 10 has wiring harness holding parts 11 and 12 of which a linear element holding unit is composed, a retaining part 13 which is retained by an opening hole formed in a chassis panel and fixed and a grommet main part 14, with which the wiring harness holding parts 11 and 12 are connected to the retaining part 13 over the whole circumferences. The cross-sectional shape of the cylindrical part of the wiring harness holding part 12 is of a uniform wave-shape but whose bends are reduced gradually toward the joint part between the wiring harness holding part 12 and the grommet main part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grommet, and more particularly, to a grommet for holding a wire harness having a path provided through an opening formed in a vehicle panel or the like.

[0002]

2. Description of the Related Art In recent years, wiring routes for wiring harnesses for vehicles have become complicated and diverse as mounting of various electric devices on vehicles has progressed, and harness protectors for avoiding interference with peripheral parts and vehicles have been developed. Parts for protecting or holding a wire harness, such as grommets, which are used when penetrating an opening provided in a panel, are often used.

[0003] In particular, a wire harness having a route from an engine room to a driver's seat or a route from a vehicle body to a door portion or the like through an opening hole opened in a vehicle panel is used to hold a routing route. A grommet formed of integrally molded rubber or the like is generally used for preventing contact with / damage to a vehicle panel and waterproofing. An example of such a grommet will be described with reference to FIG.

As shown in FIG. 7, a grommet 10a attached to a wire harness 20d penetrated and routed perpendicularly to a vehicle panel 30 includes a wire harness 20d.
a wire harness holding portions 11 and 12 for holding the routing route in close contact with the outer peripheral surface of the wire harness d; a locking portion 13 for locking and fixing the grommet 10a into a predetermined opening hole formed in the vehicle panel 30; The grommet main body 14 connects the holding parts 11 and 12 and the locking part 13 over the entire circumference.

In such a grommet, the inner diameter of the wire harness holding portions 11 and 12 corresponds to the outer diameter of the wire harness, and the inner diameter of the wire harness holding portions 11 and 12 corresponds to the outer diameter of the wire harness. The wire harness holding part 1 is formed slightly smaller than the diameter.
By inserting the wire harness through 1 and 12, the wire harness holding portions 11 and 12 adhere well to the wire harness 20d, and the wire harness 20d is satisfactorily attached to the wire harness holding portions 11 and 12 by a tape winding operation. Can be fixed.

[0006]

However, such a conventional grommet has the following problems. Since the inner diameter of the wire harness holding portion is formed corresponding to the outer diameter of the wire harness, the outer diameter of the wire harness to be held and fixed is limited, and the compatibility with wire harnesses having different outer diameters is low. .

That is, various grades are set for the same vehicle type in accordance with the needs of the user, and the number of electric wires differs due to the difference of the mounted equipment for each grade, resulting in a difference in the outer diameter of the wire harness. In this case, even if the inner diameter of the opening through which the wire harness penetrates is the same, a plurality of types of grommets are required corresponding to the outer diameter of the wire harness.

For example, as shown in FIG. 8A, in the case of a wire harness 20e whose outer diameter is smaller than the inner diameter of the wire harness holding section 12, the tape winding fixing section 4
At 0, a large step is generated in the winding diameter of the binding tape 18 and the waterproof property is reduced. That is, when the outer diameter of the wire harness is largely different from the inner diameter of the wire harness holding portion, there is a problem that the adhesion of the wire harness holding portion is deteriorated and the quality is reduced. As a configuration for solving such a problem, for example, Japanese Utility Model Laid-Open No. 2-1
As disclosed in Japanese Patent Application Publication No. 10122 and the like, there is a type in which the inner diameter of the wire harness holding portion can be adjusted to correspond to the outer diameter of various types of wire harness.

More specifically, as shown in FIG. 8B, the wire harness holding portion 12 is formed in a cylindrical shape by a corrugated continuous cross-sectional shape, and the outer diameter of the wire harness 20e is changed to a wire shape. When the diameter is smaller than the inner diameter of the harness holding portion 12, as shown in FIG. 8C, it is known that the corrugated uneven portion is folded to match the outer diameter of the wire harness 20e.

However, in such a structure, since a uniform waveform is formed over the entire cylindrical portion of the wire harness holding portion, there are the following problems when the wire harness is inserted. That is, FIG.
As shown in FIG.
When it is inserted into the wire harness holding portion 12 in the direction shown in FIG. 6, the tip portion 12a of the concave portion (extending in the longitudinal direction) of the corrugated portion protruding toward the inner peripheral side of the cylindrical portion slides on the wire harness 20f.

Further, the wire harness 20f is connected to the arrow B
9B, the outer peripheral portion of the wire harness 20f comes into contact with the recess tip 12a formed in the wire harness holding portion 12 in the entire extending direction as shown in FIG. There is a problem that workability is remarkably deteriorated. SUMMARY OF THE INVENTION An object of the present invention is to provide a grommet that has good waterproofness and tightly adheres and holds wire harnesses having different outer diameters, which are inserted into and fixed to a cylindrical wire harness holding portion, while suppressing deterioration in work efficiency. It is in.

[0012]

In order to achieve the above-mentioned object, the invention according to claim 1 has a locking portion for locking in a predetermined opening, and has a substantially cylindrical shape. A grommet comprising a linear body holding portion for holding and fixing the linear body to be routed therethrough, wherein the linear body holding portion has a continuous cross section perpendicular to the extending direction of the linear body holding portion. It has a waveform shape, and the step of the waveform shape is formed so as to decrease continuously from the tip end side of the linear body holding portion toward the grommet body side.

According to a second aspect of the present invention, there is provided a locking portion for locking in a predetermined opening hole, and a substantially cylindrical shape formed on both sides of the locking portion with the opening hole interposed therebetween. A grommet comprising a linear body holding portion for holding and fixing the linear body to be routed therethrough, at least one of the linear body holding portions is perpendicular to a direction in which the linear body holding portion extends. The cross section has a continuous waveform shape, and the step of the waveform shape is formed so as to decrease continuously from the tip end side of the linear body holding portion toward the grommet body side. .

According to such a grommet, the cross section perpendicular to the extending direction of the linear body holding portion having a cylindrical shape is formed in a continuous corrugated shape, and the step of the corrugated shape is formed on the distal end side of the linear body holding portion. Since it is formed so as to become continuously smaller toward the grommet main body side, it is possible to match the outer diameter of the linear body by folding the corrugated uneven portion, regardless of the outer diameter of the linear body The linear body can be satisfactorily held and fixed with one kind of grommet, and at the time of the insertion work of the linear body, the linear body is only contacted with the uneven portion at one end side of the cylindrical shape of the linear body holding portion, The resistance at the time of insertion is reduced, and the work efficiency of inserting the linear body can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a grommet according to the present invention will be described with reference to FIG. In this embodiment, an example is shown in which a grommet main body provided with a locking portion has linear body holding portions at both ends, and the configuration of the present invention is applied to one of the linear body holding portions. As shown in FIG. 1, the grommet 10 according to the present embodiment includes wire harness holding portions 11 and 12 that constitute a linear body holding portion, and a locking portion that locks and fixes an opening hole provided in a vehicle panel 30. 13 and a grommet body 14 that connects the wire harness holding portions 11 and 12 and the locking portion 13 over the entire circumference.

Hereinafter, the shape of the wire harness holding portion 12, which is a feature of the present invention, will be described in detail with reference to FIG. FIG. 2A shows the grommet 10 shown in FIG.
FIG. 5 is a cross-sectional view of the convex portion cut in a −A ′ direction through a corrugated convex portion of the wire harness holding portion 12. FIG. 2B shows FIG.
Is a cross-section perpendicular to the AA ′ direction of the grommet 10 shown in FIG. 5, and indicates the cross-sectional shape at the position of BB ′, CC ′, and DD ′ of the wire harness holding portion 12, respectively. Show.

As shown in FIG. 2B, the shape of the wire harness holding portion 12 is a stepped portion having a waveform shape near the tip of the holding portion (leftward in the drawing), that is, the concave portion tip 12a and the convex portion tip of the waveform. 12b, the step of the wave shape is continuously reduced toward the grommet body 14 side (), and a circular shape without a wave like the vicinity of the joint with the grommet body 14 is formed. It is formed.

That is, in the vicinity of the opening end, the cross section of the cylindrical portion is formed in a uniform waveform, and the bending of the waveform is continuously reduced toward the joint with the grommet body 14. Next, an operation of inserting the wire harness 20a into the grommet having the above-described configuration will be described with reference to FIG. FIG. 3 is a cross-sectional view of the concave portion obtained by cutting the grommet 10 shown in FIG. 1 through the corrugated concave portion of the wire harness holding portion 12 in the AA ′ direction.
The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. FIG. 3 shows only the configuration in the vicinity of the wire harness holding portion 12 of the grommet 10, and other configurations are not shown.

As shown in FIG. 3 (a), when the wire harness 20a is inserted into the wire harness holding portion 12 in the direction shown by the arrow A, the wave-shaped concave tip 12a (extending in the longitudinal direction) projecting toward the inner peripheral side of the cylindrical shape. ) Is wire harness 2
0a. Further, when the wire harness 20a is inserted in the direction indicated by the arrow A, the waveform shape of the wire harness holding portion 12 is formed such that the step of the waveform is continuously reduced from the opening end toward the joint with the grommet body 14. Therefore, as shown in FIG. 3B, the outer peripheral portion of the wire harness 20a contacts only the vicinity of the opening end 12a of the concave portion 12a formed in the wire harness holding portion 12, so that the cylindrical portion extending direction. The insertion resistance is reduced as compared with the conventional configuration (FIG. 9B) in which the whole is in contact.

Similarly, the wire harness 20a is indicated by an arrow A
In the case where the wire harness is inserted in the opposite direction, the contact resistance between the outer peripheral portion of the wire harness and the concave end 12a of the wire harness holding portion 12 is smaller than in the conventional configuration, so that the insertion resistance is reduced. That is, the wire harness 20a is inserted into the wire harness holding portion 12 with a smaller pushing force than the conventional configuration as the pushing force in the inserting direction regardless of whether the wire harness 20a is inserted in the direction of arrow A or in the opposite direction. can do.

Next, an example of the grommet having the above-described configuration in which wire harnesses having different outer diameters are inserted through the grommet will be described with reference to FIGS. The same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 4A, in the case of the wire harness 20a whose outer diameter is substantially equal to the inner diameter of the wire harness holding portion 12, the corrugated uneven portion extends,
As shown in (b), the cross section of the wire harness holding portion 12 is circular, and the wire harness 20a is in close contact with the wire harness 20a, so that the tape winding and fixing can be performed satisfactorily.

Next, as shown in FIG. 5A, in the case of the wire harness 20b whose outer diameter is slightly smaller than the inner diameter of the wire harness holding portion 12, as shown in FIG. Fold the uneven part of the wire harness 2
When the wire harness 20b and the wire harness holding portion 12 are overlapped with each other so as to be attached to the outer peripheral portion of the wire harness 20b, there is no gap between the wire harness 20b and the wire harness holding portion 12, and the tape can be satisfactorily fixed.

Next, as shown in FIG. 6A, in the case of the wire harness 20c whose outer peripheral diameter is significantly smaller than the inner peripheral diameter of the wire harness holding portion 12, as shown in FIG. As in the case of FIG. 5, the tape winding and fixing can be performed well by folding the uneven portion of the shape more than the case of the wire harness 20 b and overlapping the outer periphery of the wire harness 20 b.

In the above-described embodiment, the case where the number of convex portions of the waveform is four is shown, but the present invention is not limited to this. In short, it suffices if the corrugated convex portion can be folded to match the outer diameter of the wire harness. Further, in the above-described embodiment, the grommet body including the locking portion has been described as having a substantially conical shape. However, the present invention is not limited to this. For example, the locking portion and the linear body holding portion may have the same shape. They may be connected by a plane.

Further, in the above-described embodiment, the linear body holding portion is formed on both sides of the locking portion. However, the present invention is not limited to this. May be one. Further, in the above-described embodiment, the linear body holding portions are formed on both sides of the locking portion, and the configuration of the present invention is applied to only one of them, but the present invention is not limited to this. Instead, the configuration of the present invention may be applied to both linear body holding portions.

[0026]

As described above, according to the grommet of the present invention, the cross section perpendicular to the extending direction of the cylindrical linear member holding portion is formed into a continuous waveform, and the step of the waveform is reduced. Since it is formed so as to be continuously reduced from the distal end side of the linear body holding portion toward the grommet main body side, it is possible to match the outer diameter of the linear body by folding the corrugated uneven portion, The linear body can be satisfactorily held and fixed by one kind of grommet regardless of the outer diameter of the linear body, and at the time of the insertion work of the linear body, the uneven part is formed at one end side of the cylindrical shape of the linear body holding portion. Only by contact, the resistance at the time of insertion of the linear body is reduced, and the work efficiency of the insertion of the linear body can be improved.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a grommet according to the present invention.

FIG. 2 is a sectional view of a convex portion of one embodiment of the grommet according to the present invention.

FIG. 3 is a cross-sectional view of a recess showing an operation of inserting a linear body in an embodiment of the grommet according to the present invention.

FIG. 4 is a view showing an example of insertion of a linear body having an outer diameter equal to the inner diameter of the linear body holding portion in one embodiment of the grommet according to the present invention.

FIG. 5 is a view showing an example of insertion of a linear body whose outer diameter is slightly smaller than the inner diameter of the linear body holding part in one embodiment of the grommet according to the present invention.

FIG. 6 is a diagram showing an example of insertion of a linear body having an outer diameter smaller than the inner diameter of the linear body holding unit in one embodiment of the grommet according to the present invention.

FIG. 7 is a view showing a conventional grommet.

FIG. 8 is a diagram showing an application example of a conventional grommet.

FIG. 9 is a cross-sectional view showing an operation of inserting a linear body into a conventional grommet.

[Explanation of symbols]

 10, 10a Grommet 11, 12 Wire harness holding portion 12a Concave tip 12b Convex tip 13 Locking portion 14 Grommet body 17, 18 Fixing tape 20a to 20f Wire harness 30 Vehicle panel 40 Tape winding fixing portion

Claims (2)

[Claims] An engaging portion for engaging a predetermined opening hole, and a linear body holding portion having a substantially cylindrical shape and holding and fixing a linear body routed through the opening hole. In the grommet provided, the linear body holding portion has a waveform shape in which a cross section perpendicular to the extending direction of the linear body holding portion is continuous, and the step of the waveform shape is a tip of the linear body holding portion. A grommet characterized in that the grommet is formed so as to become continuously smaller from the side toward the grommet body side. 2. A locking portion that locks into a predetermined opening hole, and a wire that is formed in a substantially cylindrical shape on both sides of the locking portion with the opening hole interposed therebetween and that is routed through the opening hole. In a grommet comprising a linear body holding portion for holding and fixing the linear body, at least one of the linear body holding portions has a waveform shape in which a cross section perpendicular to the extending direction of the linear body holding portion is continuous. The grommet is characterized in that the step of the corrugated shape is formed so as to decrease continuously from the distal end side of the linear body holding portion toward the grommet body side.