JP2787794B2 - Grommet waterproof structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a grommet wire harness insertion portion, and more particularly, to a grommet through which a wire harness is inserted and a filler is injected into the wire harness insertion portion to waterproof the grommet. The present invention relates to a waterproof structure of a grommet that can be completely sealed by sufficiently penetrating a filler between a wire harness and a grommet and a gap between wires of the wire harness when the structure is used.

[0002]

2. Description of the Related Art For example, when a wire harness is routed between an engine room and a vehicle cabin of an automobile, an insertion hole is formed in a dash panel that partitions the two rooms, and a grommet is attached to the insertion hole. Routing is performed by inserting a wire harness inside the grommet.

At this time, in order to prevent water that has entered the engine room due to running in the rain or washing the car from traveling along the electric wires and entering the cabin, and reaching the connector portion at the end of the electric wire, the electric wire and the grommet are formed as follows. Waterproofing is performed with a sealing material. Such a waterproofing process is usually performed by pouring a curable liquid filler from the outside into the wire harness insertion portion of the grommet, and penetrating the filler between the grommet and the wire harness and between the wires of the wire harness. Thus, these gaps are sealed by curing the filler.

[0004] One of the grommet waterproof structures for the waterproof treatment is disclosed in Japanese Utility Model Publication No. 4-36193. As shown in FIG. 8 and FIG. 9 which is a cross-sectional view of the grommet waterproof structure, the grommet waterproof structure shown in FIG.
By inserting a rod-shaped spacer 4 between the electric wires 3 of the wire harness W to form a space portion 5 and injecting a liquid curable filler 6 into the grommet body 1 in this state, the filler 6 It penetrates into the space 5 and seals the entire interior of the grommet main body 1 by curing the filler 6.

The same gazette also discloses a similar grommet waterproof structure as shown in FIGS. 10 and 11. This is shown in FIG.
A spacer 9 having a plurality of bent legs 8 is inserted between the electric wires 3 of the wire harness W to form a space 5 between the electric wires 3 and, in this state, liquid hardening is performed inside the grommet body 1. By injecting the filling material 6, the filling material 6
Flows into the space 5 and seals the entire interior of the grommet body 1 by curing the filler 6.

[0006]

In these conventional grommet waterproof structures, after inserting the wire harness W into the grommet body 1, the bundle of wires 3 is pushed and expanded to insert the spacers 4 or 9 between the wires 3. It is necessary to forcibly form the space 5. However, it is difficult to push and spread the wire harness W once bundled and inserted into the grommet main body 1, resulting in poor workability. In particular, in order to insert the annular spacer 9 as shown in FIG. 10 into the inside of the wire harness W, it is necessary to form a wider space 5 between the electric wires 3, and the work of inserting the spacer 9 becomes more difficult. .

In addition, when the spacer 4 or 9 is inserted,
The electric wires 3 may be damaged. Further, in addition to the above-mentioned workability problem, although the space portion 5 is secured by the insertion of the spacer 4 or 9, since the electric wire 3 is pressed to the outside, the filling material 6 to be injected is in the space portion 5. Easily flows, but hardly penetrates into the gap between the electric wires 3. Therefore, in the radial direction of the cross section of the wire harness W, the filler 3
There is also a structural problem that uneven filling occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the conventional grommet waterproof structure, such as insufficient sealing between the grommet body and the wire harness and between the wires of the wire harness, and the problem of the wiring harness wiring. It is an object of the present invention to provide a grommet waterproof structure that improves work efficiency and improves sealing efficiency and wire harness wiring workability.

[0009]

The above object is achieved by inserting a wire harness into a grommet body having one end in a large opening cylinder and the other end in a small opening cylinder, and injecting a liquid curable filler. In the grommet waterproof structure that seals the gap between the wires of the wire harness and the gap between the small-opening tubular portion and the wire harness, a convex portion is formed in the small-opening tubular portion of the grommet body, An inner member for injecting a filler, which includes a plurality of blade members that are pushed and spread by inserting a jig for injecting a filler, inserts the wire harness inserted in the approximate center of the bundle of wires, and the inner member for injecting a filler has a convex portion. By inserting the filler injecting jig into the grommet main body so as to fit inside, expanding the wing member and injecting the filler, the wire harness between the electric wires of the wire harness Gap and said solved by grommet waterproof structure, characterized in that it has a structure for sealing a gap between the small aperture tube portion and the wire harness.

[0010] Thus, it is possible to provide a grommet waterproof structure excellent in sealing effect and workability of wiring the wire harness.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a waterproof structure of a grommet according to the present invention will be described in more detail with reference to the accompanying drawings. However, the waterproof structure of the grommet according to the present invention is not limited to the present embodiment, and various changes can be made. As shown in FIG. 2, the grommet body 1 has a large opening cylindrical portion 10 at one end,
The other end is composed of a small-opening tubular portion 11 having an inner diameter that allows the wire harness W to be inserted, and the large-opening tubular portion 10 and the small-opening tubular portion 11 are integrally connected by an elastic tubular member 12. It has become. The small-opening cylindrical portion 11 is formed with a convex portion 13 which is inserted into the wire harness W and fits an internal member (not shown) for injecting a filler having a structure described later.

The present invention relates to a waterproof structure using the grommet body 1 having such a structure. Hereinafter, the waterproofing method will be described. The filling is performed by using the filling member internal member 14 having the structure shown in FIG. The filling member injecting inner member 14 is composed of a plurality of blade members 16 extending radially from the cylindrical portion 15, and is integrally formed of a flexible material such as a resin. Here, the length of the blade of the blade member 16 is determined by the grommet body 1.
Is set to be larger than the radius of the bundle of the electric wires 3 of the wire harness W to be inserted into the wire harness W and smaller than the inner diameter of the convex portion 13 formed in the small opening cylindrical portion 11 of the grommet body 1.

Further, the blade member 16 is composed of a pair of plate members 16a and 16b extending from the cylindrical portion 15 and connected at a top portion 17, and a filling material injection jig (described later) is inserted into a hollow portion 18 of the cylindrical portion 15. (Not shown) is inserted, and when the cylindrical portion 15 is pushed outward, the plate members 16a and 1
6b is widened. As shown in FIG. 4, the inner member 14 for filling material having the above structure is
When the wire harness W is assembled, the wire harness W is inserted substantially at the center of the bundle. At this time, the filling member injecting internal member 14 is in a state where a part of the tip side of the blade member 16 protrudes outside the wire harness W.

As shown in FIG. 1, the wire harness W in which the filler injecting inner member 14 is inserted is fitted into the small opening cylindrical portion 11 of the grommet main body 1 as shown in FIG. The blade member 16 of the material injection inner member 14 is inserted so as to be fitted into the projection 13 of the grommet body 1. Injecting the filler, first, the portion of the electric wire 3 constituting the wire harness W, which is exposed from the large-opening cylindrical portion 10, is in a so-called loose state, and then the filler injecting jig 19 is used.
Of the injection tube 20 of the large opening cylindrical portion 10 (right side in the figure)
From above into the hollow portion 18 (see FIG. 3) of the inner member 14 for filling material.

The filling material injection jig 19 is of a so-called syringe type, and the injection tube 20 is formed as shown in FIG. 5 (a).
A tube 21 having a diameter larger than the diameter of the hollow portion 18 of the inner member 14 for filling material, and a constriction 22 continuous with the tube 21, and a tube wall and a constriction 22 of the tube 21. A filler outflow hole 23 is drilled at the tip of.

Further, as shown in FIG. 5B, the injection pipe 20 is provided with a wing piece 24 corresponding to the number and the arrangement position of the blade members 16 of the inner member 14 for filling material in the constricted portion 22. When the filler injection jig 14 is inserted, the blade pieces 24 are attached to the plate members 16 a and 16 b of the blade member 16.
Between the plate members 16a and 16b. In addition, the wing piece 24 is in the constricted part 22.
However, the present invention is not limited to this, and may be provided on the cylindrical portion 21.

As shown in FIG. 6 (cross-sectional view taken along the line AA 'in FIG. 1), the hollow member 18 of the inner member 14 for filling material is pushed by the insertion of the filling tube 20 of the filling material filling jig 19. The plate member 1 which is expanded and constitutes the blade member 16
From the state where 6a and 16b are closed (the same figure (a)), the plate materials 16a and 16b are separated (the same figure (b)), and at the same time, the electric wire 3 is also pressed toward the inner wall of the convex portion 13, The gap between the electric wires 3 is also enlarged.

As described above, the filler is injected in a state where the hollow portion 18 of the inner member 14 for injection of the filler, the blade member 16 and the electric wire 3 are pushed and expanded, so that the injected filler is injected into the injection pipe 20. Flows out from the filler outflow hole 23, and penetrates without gaps between the wire harness W and the convex portion 13 of the grommet main body 1 and between the electric wires 3. After injecting the filler, the filler injecting jig 19 is pulled out from the filler injecting internal member 14, whereby the filler injecting internal member 1 is removed.
The hollow portion 18 and the blade member 16 of 4 automatically return to the state before insertion, that is, the state in which the plate members 16a and 16b constituting the blade member 16 are closed.

As described above, the grommet waterproof structure is completed. Note that the filler injecting inner member 14 used for the waterproof structure of the grommet according to the present invention can take various shapes. For example, as shown in FIG.
The number of the blade members 16 can be increased or decreased according to the size of the convex portion 13 of the grommet main body 1 or the diameter of the bundle of the electric wires 3 constituting the wire harness W to be inserted, and the opening and closing thereof can be facilitated. . When they have a large diameter ((a) in the figure), the number of the blade members 16 is increased, and when they have a small diameter ((b) in the figure), the number of the blade members 16 is reduced. The opening and closing of the 16 can also be facilitated. in this case,
The wing pieces 24 of the injection pipe 20 of the filler injection jig 19 are also provided correspondingly.

[0020]

According to the grommet waterproof structure,
The filler can penetrate and fill the filler uniformly and without gap between the grommet body and the wire harness and between the wires of the wire harness, and the sealing property accompanying the hardening of the filler is remarkably improved. The sealing of the insertion portion can be ensured.

Further, since the filler is injected in a state in which the filler injecting member is inserted in the wire harness in advance, there is no danger of damage to the electric wire due to insertion of the spacer at the time of the injection of the filler as in the related art. . Furthermore, since the filling material injection | pouring internal member prevents electric wire displacement of the electric wire which comprises a wire harness, wiring work becomes easier.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a grommet waterproof structure according to the present invention.

FIG. 2 is a cross-sectional view of a grommet body used in the grommet waterproof structure shown in FIG.

FIG. 3 is a perspective view of a filler injecting internal member used in the grommet waterproof structure shown in FIG.

FIG. 4 is a view showing a state in which a filler injecting internal member is inserted into a wire harness.

5 is a perspective view showing a preferred example of an injection pipe of a filler injection jig used for the grommet waterproof structure shown in FIG. 1; FIG. 5 (a) is without a wing piece, and FIG. It has wings attached.

6 is a cross-sectional view of the grommet main body AA ′ in the grommet waterproof structure shown in FIG. 1, wherein FIG. 6A is a state before a filler injection jig is inserted, and FIG. It is a figure showing a state at the time.

FIG. 7 is a view for explaining the relationship between the size of the grommet main body and the inner member for injecting filler used in the grommet waterproof structure according to the present invention. FIG. 7 (a) shows a case where the grommet main body has a large diameter. FIG. 2B is a view showing a case where the grommet main body has a small diameter.

FIG. 8 is a perspective view showing a conventional grommet waterproof structure.

FIG. 9 is a sectional view of FIG.

FIG. 10 is a perspective view showing a spacer used in another conventional grommet waterproof structure.

11 is a cross-sectional view showing a grommet waterproof structure using the spacer of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet main body 2 Reduced diameter hole 3 Electric wire 4 Spacer 5 Spacer 6 Filler 7 Annular part 8 Leg 9 Spacer 10 Large opening cylindrical part 11 Small opening cylindrical part 12 Cylindrical member 13 Convex part 14 Internal member for filler injection Reference Signs List 15 cylindrical portion 16 blade member 17 top portion 17a, 17b plate material 18 hollow portion 19 filler injecting jig 20 injection tube 21 cylindrical portion 22 narrowing portion 23 filler outflow hole 24 blade piece W wire harness

Claims (1)

(57) [Claims] 1. A wire harness is inserted into a grommet body having one end formed into a large-opening cylindrical portion and the other end formed into a small-opening cylindrical portion. In a grommet waterproof structure for sealing a gap between a small opening cylindrical portion and a wire harness, a convex portion is formed in the small opening cylindrical portion of the grommet main body, and the grommet body is pushed by inserting a filler injection jig. The wire harness in which a filler injecting internal member including a plurality of blade members to be expanded is inserted at substantially the center of the wire bundle,
By inserting the filler injecting jig, inserting the filler injecting jig, expanding the wing member, and injecting the filler, the filler injecting inner member is inserted into the grommet body so as to fit into the convex portion, A waterproof grommet structure, wherein a gap between wires of the wire harness and a gap between the small opening cylindrical portion and the wire harness are sealed.