JP3064223B2 - Grommet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to waterproofing electric wires to a panel that separates a vehicle room (internal space) that requires waterproofing and an engine room (external space) that does not require waterproofing, such as an automobile dash panel. Regarding grommet passing through the state.

[0002]

2. Description of the Related Art FIG. 7 shows an initial form of a grommet 1 according to Japanese Patent Application No. 7-154680 filed earlier by the present applicant. An annular groove 3 is formed on the outer peripheral surface, and an electric wire insertion portion 5 is connected to a small-diameter end of the elastic bulging portion 2 via a bellows portion 4.

A plurality of annular projections 6 are formed on the inner peripheral surface of the electric wire insertion portion 5 and are crushed by the outer peripheral surface of a wire harness 15 described later. A filler container 7 is provided at an end of an external space 18 which will be described later.
Is formed.

The filler accommodating portion 7 is larger in diameter than the wire insertion portion 5 and has a diameter smaller than the inner diameter of the large-diameter opening 13 of the elastic bulging portion 2 so that the required amount of the filler 20 can be reduced. It is formed in a cylindrical shape that keeps it small.

[0005] The filler 2 is provided on the inner peripheral surface of the filler accommodating section 7.
A plurality of annular ridges 8a and 8b for preventing peeling of zero are formed at an intermediate portion in the axial direction.

[0006] Opposite to the opening side of the filler container 7
A cut-out portion 10 is provided. The cut portion 10 is defined by a thin-walled easy-to-break portion 9, and the lower side of the easy-to-break portion 9 substantially coincides with the edge of the ridge 8b located on the opening side.

FIG. 8 shows a state from the manufacturing of the grommet 1 to the completion of the drawing of the higher harness 15. The filler accommodating portion 7 is turned over outside from a connection portion with the wire inserting portion 5, and the wire inserting portion 5 and By having a double structure in which the outside of the bellows portion 4 is covered, the filler accommodating portion 7 is not easily crushed and deformed into an oval cross section even if it receives a radial load from the outside, and When returning from the inverted state to the initial state at the time of manufacturing, the initial set shape is appropriately restored.

[0008] With the filler accommodating portion 7 turned upside down, the diameter increasing jig 1 having the wire insertion portion 5 inserted thereinto.
1, the large-diameter side opening 1 of the elastic bulging portion 2 extends from the folded side opening 12 of the wire insertion portion 5 and the filler accommodating portion 7.
3, a wire harness 15 in which a plurality of electric wires are bundled with an insulating tape 14 is inserted and pulled through, and the wire harness 15
The diameter-enlargement jig 11 is removed in a state where one end of the position identification tape 16 set on the outer peripheral surface is aligned with the position of the return side opening 12 of the filler accommodating portion 7.

FIG. 9 shows a case (internal space) 1 in which the grommet 1 needs to be waterproof, like a dash panel of an automobile.
7 and engine room (external space) 1 that does not require waterproofing
8 shows a state where the filler accommodating section 7 is mounted on the position identification tape 16 of the wire harness 15 after the grommet 1 with the filler accommodating section 7 turned upside down as described above. And the grommet 1 is erected so that the filler accommodating portion 7 is located at the upper side, and the liquid curable filler 20 is placed inside the filler accommodating portion 7 from above at the upper edge of the upper protrusion 8b. And then solidified by pinching both sides of the easy-break line 9 with a fingertip and tearing it with the force of a fingertip to cut off the cutout 10 from the filler accommodating section 7 along the easy-break line 9. The grommet 1 together with the wire harness 15 protruding from the elastic bulging portion 2 of the panel 1 is inserted into the hole 21 of the panel 19 from the external space 18.
And the groove 3 of the grommet 1 is fitted and mounted.

When the grommet 1 is mounted on the panel 19, the space between the cured filler 20 and the tape 14 wound around the outer periphery of the wire harness 15 is completely closed at the opening side of the filler accommodating section 7. It will be in a state where it was lost.

As a result, the intrusion of water into the grommet 1 is completely prevented, the occurrence of water pools inside the grommet 1 can be prevented, and the durability of the grommet 1 and the tape 14 can be improved. .

Further, since water flows down from the portion where the cut-off portion 10 is cut off, it is possible to prevent water from accumulating between the opening and the filler 20 and to completely perform waterproofing. .

[0013]

However, in the grommet 1, the filler container 7 is attached to one end of the position identification tape 16 of the wire harness 15 with the filler container 7 turned upside down.
When the grommet 1 is moved along the wire harness 15 in order to match the edges of the turning-side opening 12 of
Since the contact resistance of the grommet 1 with the wire harness 15 is large, the edge of the folded side opening 12 of the filler accommodating portion 7 of the grommet 1 extends and deforms in the moving direction, and the position can be roughly confirmed. It was found that the alignment was likely to be incorrect.

In view of the above, according to the present invention, in a state where the filler accommodating portion is turned over to the outside of the wire insertion portion when the electric wire is inserted, the edge of the folded side opening of the filler accommodating portion can be accurately positioned at a predetermined position of the electric wire. An object of the present invention is to provide a grommet that can be aligned and that can improve quality and reliability.

[0015]

According to the first aspect of the present invention, an elastic bulging portion fitted and mounted in a hole formed in a panel that divides an internal space and an external space; An electric wire insertion portion for contacting the electric wire inside to pass through the internal space and the external space, and a filler is injected into the inside of the external space side end of the electric wire insertion portion which is formed with a diameter larger than that of the electric wire insertion portion. A filler container, and a mark provided on the bottom surface of the filler container, which is a folded end surface when the filler container is turned over from the connection portion with the wire insertion portion to the outside of the wire insertion portion when the wire is inserted. And a projection.

According to the first aspect of the present invention, in a state where the filler accommodating portion is turned over to the outside of the wire insertion portion when the electric wire is inserted, the grommet is drawn through the electric wire and moved, and at the bottom of the filler accommodating portion. The grommet can be accurately positioned at a predetermined position of the electric wire by matching a mark projection provided on a certain folded end surface with a preset position of the electric wire.

According to a second aspect of the present invention, the mark projections according to the first aspect are arranged at four equally spaced positions in the circumferential direction of the bottom surface of the filler accommodating portion.

According to the second aspect of the present invention, the mark projections are arranged at four equally-spaced positions in the circumferential direction of the bottom surface of the filler accommodating portion. The disadvantage that thermal deformation occurs can be eliminated.

According to a third aspect of the present invention, a groove is formed in the base of the mark projection according to the first or second aspect of the present invention on the folded end surface side.

According to the third aspect of the present invention, since the groove is formed in the base on the folded end face side of the mark projection, the filler injected into the filler accommodating portion enters and solidifies to prevent the filler from coming off. Therefore, it is possible to omit a plurality of annular protrusions for preventing separation of the filler from the inner peripheral surface of the filler accommodating portion.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings, in which the same reference numerals are given to the same parts as those of the aforementioned conventional structure.

In FIG. 1 to FIG.
The wire insertion part 5 is connected to the small-diameter side end of the wire insertion part via the bellows part 4, the filler storage part 7 is formed at the outer space 18 side end of the wire insertion part 5, The portion 7 has a diameter larger than that of the wire insertion portion 5 and has a diameter smaller than the inner diameter of the large-diameter opening 13 of the elastic swelling portion 2 so as to be formed in a cylindrical shape for suppressing the necessary amount of the filler 20 to a small amount. In this respect, an annular projection 6 crushed by the outer periphery of the wire harness 15 passed through the inner surface of the wire insertion portion 5
Are formed on the inner peripheral surface of the filler accommodating portion 7, a plurality of annular ridges 8 a, which prevent separation of the filler 20.
8b is formed at an intermediate portion in the axial direction, and a cut portion 10 defined by a thin easy-to-break line 9 is formed on the opening side from the edge of the ridge 8b on the upper side of the filler accommodating portion 7. The wire harness 15 is formed after the grommet 1 is manufactured.
Until the drawing-in of the wire is completed, the filler accommodating portion 7 is turned over to the outside of the connection portion with the wire insertion portion 5 so that the wire insertion portion 5 and the bellows portion 4
The basic structure of the grommet according to the earlier proposal of the applicant of the present invention is the same as that of the grommet according to the above-mentioned proposal, in that the outer surface of the grommet is covered with a double structure.

In this embodiment, when the filler housing portion 7 is folded back from the connection portion with the wire insertion portion 5 to the outside of the wire insertion portion 5 when the wire harness 15 is inserted, the filling end 22 becomes the folded end surface 22. Mark projections 23 on the bottom surface of the medicine container 7
Are provided integrally.

The mark projections 23 are formed in a front triangular shape with their apexes facing the folded side opening 12 of the filler accommodating portion 7, and are located at four equally spaced positions on the bottom surface 22 of the filler accommodating portion 7 in the circumferential direction. Are located.

According to the structure of the above embodiment, when the filler accommodating portion 7 is turned upside down, the wire insertion portion 5 is inserted through the folded side opening 12 of the filler accommodating portion 7 expanded by the diameter expanding jig 11. , The wire harness 15 is inserted into the large-diameter side opening 13 of the elastic bulging portion 2 and pulled in, the grommet 1 is moved along the wire harness 15, and the wire harness 1 is moved.
In the case where the folded side opening 12 of the filler accommodating portion 7 is made to coincide with one end of the position identification tape 16 set on the outer peripheral surface of
Since the apex of the mark projection 23 provided on the folded end surface 22 which is the bottom surface of the filler accommodating portion 7 is close to the wire harness 15, the apex is made to coincide with one end of the position identification tape 16 so that the grommet 1 can be accurately positioned. Can be aligned.

After the positioning with reference to the mark projection 23 is completed, the diameter-enlargement jig 11 is removed, the filler accommodating section 7 is turned over to return to the initial state, and the filler accommodating section 7 is positioned upward. The grommet 1 is set up so that the filler 20 is injected into the interior of the filler accommodating portion 7 from above until it reaches the upper edge of the upper ridge 8b and solidified, so that the grommet 1 is connected to the wire harness 15. Installation ends.

After the curing of the filler 20, the cut portion 10
Is separated from the filler container 7 along the easy breaking line 9,
The grommet 1 is inserted into the hole 21 of the panel 19 from the external space 18 together with the wire harness 15 protruding from the elastic bulging portion 2 of the grommet 1 and the groove 3 of the grommet 1 is fitted and mounted, so that the wire harness 15 is fitted. Outside space 18
Then, the wiring to the internal space 18 is completed.

According to the structure of this embodiment, the mark projection 2
3 are arranged at each of four equally-spaced positions in the circumferential direction of the bottom surface 22 of the filler accommodating portion 7, the interval between the adjacent mark projections 23 is reduced, and the filler accommodating portion is formed at the time of molding the grommet 1. The occurrence of thermal deformation on the bottom surface 22 of the base 7 can be avoided.

FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, a groove 24 is formed at the base of the mark projection 23.
Is formed.

If the mark projections 23 are formed as undercuts as in this embodiment, the filler 20 injected into the filler accommodating portion 7 enters the groove 24 and solidifies, so that the solidified filler 20 is prevented from coming off. And the annular ridges 8a and 8b for preventing separation of the filler 20 from the inner peripheral surface of the filler accommodating portion 7 can be omitted.

If the insulating tape 14 is removed from the portion of the wire harness 15 inserted into the filler accommodating portion 7, the filler 20 penetrates between the electric wires to further improve the waterproofness. .

The same effect as in the above embodiment can be obtained by forming the position identification by printing or the like instead of the position identification tape 16.

[0033]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect, in a state where the filler accommodating portion is turned over to the outside of the wire insertion portion when the electric wire is inserted, the grommet is drawn through the electric wire and moved, and the folded back portion which is the bottom surface of the filler accommodating portion is provided. Since the mark projections provided on the end face are aligned with the predetermined positions of the electric wires, the grommet can be accurately aligned with the predetermined positions of the electric wires and mounted, thereby improving the quality and reliability. it can.

According to the second aspect of the present invention, since the mark protrusions are arranged at four equally-spaced positions in the circumferential direction of the bottom surface of the filler accommodating portion, the interval between the adjacent mark protrusions is reduced, and the grommet is formed. At times, it is possible to avoid the occurrence of thermal deformation on the bottom surface of the filler accommodating portion, and it is possible to further enhance the quality.

According to the third aspect of the present invention, since the groove is formed in the base on the folded end surface side of the mark projection, the filler injected into the filler accommodating portion can enter the groove and solidify to prevent the filler from falling out. Therefore, it is possible to omit a plurality of annular projections for preventing the exfoliation of the filler from the inner peripheral surface of the filler accommodating portion.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a wire harness of a grommet according to a first embodiment of the present invention has been drawn through.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a cross-sectional view showing a state before a filler is injected through a wire harness of the grommet of the embodiment.

FIG. 4 is an exemplary sectional view showing a state where the grommet according to the embodiment is attached to a panel;

FIG. 5 is a sectional view showing a grommet according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a state where the grommet of the embodiment is attached to a panel.

FIG. 7 is a cross-sectional view showing an initial form of a grommet according to the earlier proposal of the present applicant.

FIG. 8 is a sectional view showing a state where the wire harness of the grommet shown in FIG. 7 is drawn through.

FIG. 9 is a sectional view showing a state where the grommet shown in FIG. 8 is attached to a panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 Elastic swelling part 5 Electric wire insertion part 7 Filler accommodating part 15 Electric wire (wire harness) 17 Internal space 18 External space 19 Panel 20 Filler 21 Hole 22 Folded end surface (bottom surface of filler accommodating part) 23 Mark protrusion 24 grooves

Claims (3)

(57) [Claims] An elastic bulging portion fitted and mounted in a hole formed in a panel for partitioning an internal space from an external space, and an inner space and an external space formed by contacting an electric wire inside the elastic bulging portion. An electric wire insertion part, a filler storage part formed at the outer space side end of the electric wire insertion part with a diameter larger than that of the electric wire insertion part, and a filler is injected into the inside, and the filler storage part A grommet comprising: a mark projection provided on a bottom surface of a filler accommodating portion serving as a folded end surface when the wire is turned over from a connection portion with the wire insertion portion to the outside of the wire insertion portion when the wire is inserted. 2. The grommet according to claim 1, wherein the mark projections are arranged at four equally circumferential positions on the bottom surface of the filler accommodating portion. 3. The grommet according to claim 1, wherein a groove is formed in the base of the mark projection on the side of the folded end surface.