JP2006248380A - Grommet for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and precisely adapt one grommet to a plurality of lead wires. <P>SOLUTION: A closed wall 32 is installed at the tip of a guide cylinder part 22 projected from a peripheral wall of a grommet 11, and a plurality of partition walls 33, 34, 35 provided with lead wire insertion holes 28, 29, 30 at a center are spaced in the longitudinal direction. Bore diameters D1-D3 of the lead wire insertion holes 28-30 are differentiated in a manner that the partition wall 25 on the tip side has a minimum diameter, and any of the insertion wire holes 28-30 is brought into close contact with lead wires 10A-10C with different diameters. The outer periphery of the guide cylinder part 22 is gradually reduced in diameter toward the tip while forming a step in each of the partition walls 33, 34, 35 as inclination parts 24a, 24b between the respective partition walls 33, 34 and 35. When the lead wire 10 is inserted, the inclination parts 24a, 24b on the tip side of the lead wire insertion holes 28-30 selected are cut. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a grommet for an automobile, in which a lead wire is inserted through a peripheral wall of the grommet in a grommet that is externally mounted on a wire harness and attached to a through hole provided in a body panel of the automobile.

  A grommet attached to a wire harness routed in an automobile is attached to a through-hole provided in a vehicle body panel that separates the passenger compartment from the exterior to prevent intrusion of water, dust, and noise into the indoor side. For example, the present applicant has provided Japanese Patent Application Laid-Open No. 2001-138837 (Patent Document 1) as a grommet that allows a lead wire connected to the bonnet opener to penetrate the grommet at the same time.

  As shown in FIG. 6, the grommet is provided with a bullet wire-shaped lead wire through hole 2 in the peripheral wall portion of the grommet 1 and is closed by attaching a sealing plug 3 when not in use.

There are right-hand drive cars and left-hand drive cars in automobiles. Normally, lead wires penetrate grommets in left-hand drive cars, but lead wires do not penetrate grommets in right-hand drive cars.
The grommet shown in FIG. 6 can be used for both the left and right steering wheels, but when the lead wire is not penetrated, a separate sealing plug 3 is required, which increases the number of parts and the number of attachments.
In order to solve this problem, there is a configuration in which a cylindrical portion is protruded from the periphery of the lead wire through hole, the tip of the cylindrical portion is set as a closed portion, and the closed portion is tipped when the lead wire is passed through.

However, the lead wire through hole 2 shown in FIG. 6 and the lead wire through hole provided in another grommet are both one-diameter through holes.
There are multiple types of lead wires with different outer diameters. Therefore, when the inner diameter of the through hole is smaller than the outer diameter of the lead wire, the load during the lead wire penetrating operation is increased, and workability is significantly reduced. On the other hand, when the inner diameter of the through hole is larger than the outer diameter of the lead wire, there is a problem that a gap is generated and water is submerged from the gap.
This problem can be dealt with by preparing and preparing multiple types of grommets with different lead wire through-hole diameters. There is a problem that the manufacturing cost of the mold becomes high.

JP 2001-138837 A

  The present invention has been made in view of the above problems, and whether or not the lead wire is inserted and when the lead wire is inserted, even if the lead wire has a different diameter, the lead wire is surely adhered to the outer peripheral surface of the lead wire. It is an object of the present invention to provide an automotive grommet capable of waterproofing, dustproofing and soundproofing a lead wire insertion hole.

In order to solve the above problems, the present invention is a grommet that is externally mounted on a wire harness and is attached to a through hole of a vehicle body panel,
A lead wire loose insertion hole is drilled in a part of the peripheral wall of the tubular portion provided with the wire harness through hole, and a guide tubular portion is projected from the periphery of the lead wire loose insertion hole.
A closed wall that is cut when the lead wire is inserted is provided at the tip of the guide cylinder part, and a plurality of partition walls are provided in the guide cylinder part at intervals in the length direction. A small-diameter lead wire is provided at the center of the partition wall. Insertion holes are provided, and the diameters of these lead wire insertion holes are sequentially made different so that the partition wall on the tip side becomes the minimum diameter, and the lead wire insertion holes of any of the partition walls are provided to a plurality of types of lead wires having different diameters. The outer peripheral surface of the guide tube portion is set to have a tight edge, and the diameter of the guide tube portion is reduced toward the tip while forming a step for each partition wall with each partition wall as an inclined portion.
An automotive grommet is provided that is configured to cut the inclined portion on the distal end side of the lead wire insertion hole that is in close contact with the outer diameter of the lead wire to be inserted when the lead wire is inserted.

In the grommet, when the lead wire is not passed through the right-hand drive vehicle, the closing wall of the guide tube portion is used without being cut. On the other hand, when a lead wire is passed through a left-hand drive wheel, a required inclined portion of the guide tube portion is cut so that the lead wire passes through a lead wire insertion hole corresponding to the diameter of the lead wire.
In this way, a single grommet can be used with or without a lead wire inserted, and it can be used for lead wires of multiple diameters, so the grommet can be shared, reducing the number of parts and reducing the cost of mold production. Therefore, cost reduction can be achieved.

  Specifically, in the grommet of the present invention, lead wire insertion holes having diameters suitable for a plurality of commonly used lead wires are accurately drilled in advance in each partition wall provided in the guide tube portion. Therefore, the periphery of the lead wire insertion hole can be securely adhered to the outer peripheral surface of the lead wire to be inserted. In addition, since the stepped portion and the inclined portion are alternately provided on the outer peripheral surface of the guide tube portion, the shape of the partition wall (lead wire insertion hole) can be easily recognized. Therefore, when inserting the lead wire, check the position of the partition wall where the lead wire insertion hole of the desired diameter is formed, and then cut the inclined part of the guide tube part on the tip side from that position, so that the optimal lead The wire insertion hole can always be set accurately, improving workability.

  In addition, an annular protrusion or the like may be formed on the outer peripheral surface of the guide tube portion corresponding to the position of each partition wall so that the position of each partition wall can be more clearly determined from the outside.

The interval between the partition walls is preferably 5 mm or more and 10 mm or less and is provided with three partition walls. Thus, since the sufficient cutting | disconnection area | region can be ensured by making the space | interval of a partition wall into 5 mm or more, the erroneous operation | work which cut | disconnects a partition wall accidentally can be prevented. And the protrusion amount to the indoor side of a guide cylinder part can be suppressed by setting it as 10 mm or less.
In addition, since the grommet including the partition wall is integrally formed of an elastic material made of rubber or elastomer, there are three partition walls and three lead wire insertion holes with different diameters. It is possible to cope with lead wires having a difference.

As described above, according to the present invention, since one grommet is suitable for lead wires having a plurality of types of diameters, it is possible to promote the sharing of parts, reduce the cost of molds and parts, and reduce costs. be able to.
In addition, a plurality of types of lead wire insertion holes are prepared so as to correspond to a plurality of types of lead wires, and the position of these lead wire insertion holes can be easily confirmed from the outer surface of the guide tube portion. The lead wire insertion hole with a diameter of can be always set easily and accurately. Therefore, it is possible to prevent an erroneous operation of cutting the guide tube portion at an incorrect position.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4A, 4B, and 4C show a grommet 11 according to the first embodiment of the present invention, and the grommet 11 is a vehicle body panel that partitions the engine room X side and the indoor Y side of the automobile. It is attached through a through hole H provided in P. The grommet 11 is connected to a battery or engine on the engine room X side and is externally mounted on a wire harness W / H consisting of an engine harness (front harness) connected to a junction box on the vehicle compartment Y side. An insertion portion for the lead wire 10 to be connected is also provided.

  The grommet 11 is integrally formed of an elastic material made of rubber or elastomer. As shown in FIG. 1, between the first small-diameter cylindrical portion 12 positioned on the outdoor side at both ends and the second small-diameter cylindrical portion 15 positioned on the indoor side, the large-diameter cylindrical portion 13 and the large-diameter cylindrical portion 13 that increase in diameter in steps. It integrally molds with the diameter cylinder part 14 interposed. A continuous hollow portion of the first small diameter cylindrical portion 12, the large diameter cylindrical portion 13, the large diameter cylindrical portion 14, and the second small diameter cylindrical portion 15 is used as a wire harness through hole 17. An annular vehicle body locking groove 14 a is provided on the outer periphery of the large-diameter cylindrical portion 14 so as to be locked to the periphery of the through hole H. Moreover, the front-end | tip of the large diameter cylinder part 14 and the periphery of the 2nd small diameter cylinder part 15 are made to continue by the thin wall closing wall 14b.

As shown in FIG. 2, lead wire loose insertion holes 18 having openings at both ends in the axial direction are provided in part of the circumferential direction of the enlarged diameter cylindrical portion 13 and the large diameter cylindrical portion 14 of the grommet 11.
The opening on the indoor side of the lead wire loose insertion hole 18 is located on the thin wall 14b, and a guide tube portion 22 projects from the periphery of the opening. A closing wall 32 is provided at the tip of the guide tube portion 22 that protrudes to the indoor side. The other end of the lead wire loose insertion hole 18 is an opening 25.
Further, as shown in an enlarged view in FIG. 3, three partition walls 33, 34, and 35 are provided inside the guide cylinder portion 22 with a spacing of 6 mm in the length direction. The distance between the front end side partition wall 35 and the closing wall 32 is also 6 mm. The partition walls 33, 34, and 35 are sequentially made to have different outer diameters so that the outer diameter becomes the minimum diameter toward the tip.

Lead wire insertion holes 28, 29, and 30 are formed in the centers of the partition walls 33, 34, and 35, and the diameters of these lead wire insertion holes are sequentially reduced.
That is, the diameter D1 of the lead wire insertion hole 28 formed in the partition wall 33 on the rear end side in the insertion direction indicated by the arrow Z is set to allow the thick lead wire 10A to be inserted and to be in close contact with the outer periphery thereof.
The diameter D2 of the lead wire insertion hole 29 drilled in the partition wall 34 at the intermediate position is set such that the lead wire 10B having the intermediate diameter can be inserted and is in close contact with the outer periphery thereof.
The diameter D3 of the lead wire insertion hole 30 drilled in the partition wall 35 on the distal end side is set such that the thin lead wire 10C can be inserted and is in close contact with the outer periphery thereof.

  Further, the outer peripheral wall of the guide tube portion 22 includes a peripheral wall 23a, 23b corresponding to the position of each partition wall 33, 34, and a peripheral wall 23c at the distal end from the distal end side partition wall 35 to the closing wall 32, respectively. A straight portion having the same diameter is used. On the other hand, the peripheral walls between the partition walls 33 and 34 and the partition walls 34 and 35 are inclined portions 24a and 24b. Thereby, the guide cylinder part 22 is made into the shape which diameter-reduces gradually toward a front-end | tip, providing a level | step difference between each partition wall 33,34,35.

  When the lead wire 10 is inserted into the grommet 11 having the above-described configuration, a lead wire having a diameter suitable for the diameter of the lead wire 10 to be inserted is selected from the lead wire insertion holes 28, 29, and 30. The guide tube portion 22 is cut at the position of the inclined wall of the guide tube portion 22 on the front side in the insertion direction from the selected lead wire insertion hole. The cutting positions are positions C1, C2, and C3 indicated by dotted lines in FIG. After this state, the lead wire inserted into the lead wire free insertion hole 18 from the opening 25 is passed through the lead wire insertion hole of the partition wall in the guide cylinder portion 22, and the periphery of the lead wire insertion hole is connected to the lead wire 10. It is in close contact.

For example, when inserting the thick lead wire 10A, as shown in FIG. 4A, the guide tube portion 22 is cut at the cutting position C1 of the front inclined portion 24a of the lead wire insertion hole 28 having a large diameter. As a result, the lead wire insertion hole 28 optimum for the lead wire 10A can be selected.
Similarly, when inserting the lead wire 10B having an intermediate diameter, as shown in FIG. 4B, the guide tube portion 22 is cut at the cutting position C2 of the inclined portion 24b on the front side of the lead wire insertion hole 29 having an intermediate diameter. By doing so, the lead wire insertion hole 29 most suitable for the lead wire 10B can be selected.
When inserting the thin lead wire 10C, as shown in FIG. 4C, the lead wall 10C is cut by cutting the closing wall 32 at a cutting position C3 in front of the lead wire insertion hole 30 having a small diameter. The optimum lead wire insertion hole 30 can be selected.

  In this way, the grommet 11 is suitable for three types of lead wires 10A to 10C with a single grommet, so that it is possible to promote the sharing of parts and reduce the cost of molds and parts, etc. Can be planned.

  Further, the lead wire insertion holes 28 to 30 are set to optimum diameters that are in close contact with the outer circumferences of the lead wire insertion holes 10A to 10C in accordance with the outer diameters of the selected three types of lead wires 10A to 10C. Therefore, the caliber does not change due to camera shake or the like when the guide tube portion 22 is cut, thereby facilitating the work and improving the accuracy.

Further, the positions where the lead wire insertion holes 28 to 30 are provided can be easily grasped from the steps of the inclined portions 24 a and 24 b of the peripheral wall of the guide tube portion 22. Accordingly, the cut positions C1 to C3 can be clearly discriminated, and the interval between the partition walls 33, 34, and 35 and the interval between the partition wall 35 and the closing wall 32 are set to 5 mm or more. , 34 and 35 can be prevented from being erroneously cut.
On the other hand, since the interval between the partition walls 33, 34, and 35 is 10 mm or less, the amount of protrusion of the guide tube portion 22 toward the room Y side can be suppressed while providing three partition walls. Effective use can be achieved.

  5 (A) and 5 (B) show a second embodiment of the present invention, in which annular projections 36a, 36b, and 36c are projected at positions corresponding to the partition walls 33, 34, and 35 on the peripheral wall of the guide tube portion 22. Has been established. Other configurations are the same as those in the first embodiment.

  As a result, the positions of the partition walls 33, 34, and 35 can be more clearly discriminated from the outside of the guide tube portion 22, and the cutting tool for cutting the guide tube portion 22 has the annular protrusion 36a having a convex cross section. It is easier to fit on the surfaces of the inclined portions 24a and 24b having a concave cross section than on -36c, and from this point, it is possible to prevent erroneous work that erroneously cuts the partition walls 33, 34, and 35.

It is explanatory drawing which shows the state which attached the grommet which concerns on 1st embodiment of this invention to the through-hole of the vehicle body panel. It is sectional drawing of the grommet shown in FIG. It is a principal part expanded sectional view of the grommet shown in FIG. FIG. 2 is an enlarged cross-sectional view of a main part showing a state in which a lead wire is inserted into the grommet shown in FIG. 1, (A) is a thick lead wire, (B) is an intermediate diameter lead wire, and (C) is a fine lead wire. It is a figure which shows the state which each inserted. The principal part of the grommet which concerns on 2nd embodiment of this invention is shown, (A) is a front view, (B) is sectional drawing. It is a figure of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lead wire 11 Grommet 13 Wide diameter part 14 Large diameter cylinder part 17 Wire harness insertion part 18 Lead wire insertion part 22 Guide cylinder part 24a, 24b Inclination part 28, 29, 30 Lead wire insertion hole 32 Closing wall 33, 34, 35 Partition wall C1-C3 Cutting position

Claims (2)

A grommet that is externally mounted on a wire harness and is attached to a through hole of a vehicle body panel,
A lead wire loose insertion hole is drilled in a part of the peripheral wall of the tubular portion provided with the wire harness through hole, and a guide tubular portion is projected from the periphery of the lead wire loose insertion hole.
A closed wall that is cut when the lead wire is inserted is provided at the tip of the guide cylinder part, and a plurality of partition walls are provided in the guide cylinder part at intervals in the length direction. A small-diameter lead wire is provided at the center of the partition wall. Insertion holes are provided, and the diameters of these lead wire insertion holes are sequentially made different so that the partition wall on the tip side becomes the minimum diameter, and the lead wire insertion holes of any of the partition walls are provided to a plurality of types of lead wires having different diameters. The outer peripheral surface of the guide tube portion is set to have a tight edge, and the diameter of the guide tube portion is reduced toward the tip while forming a step for each partition wall with each partition wall as an inclined portion.
An automotive grommet characterized in that when the lead wire is inserted, the inclined portion on the tip side of the lead wire insertion hole that is in close contact with the outer diameter of the lead wire to be inserted is cut.   The automobile grommet according to claim 1, wherein the partition wall has an interval of 5 mm or more and 10 mm or less and includes three partition walls.

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