JP2558758Y2 - Grommet with body earth 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 grommet used for protecting an automobile wire harness penetrating a vehicle body panel, and more particularly to a grommet having a body earth structure for earthing a ground wire of the wire harness to a vehicle body. .

[0002]

2. Description of the Related Art In general, an insertion hole is provided in a dash panel (vehicle panel) that partitions an engine room and an interior space of an automobile, and a wire harness penetrates the dash panel. The wire harness has a tip portion connected to a connector in advance to facilitate a connection operation after being inserted into the dash panel, and the insertion hole has an inner diameter sufficient to insert the connector. .

Accordingly, a large opening is formed in the dash panel as it is, which is not preferable in terms of soundproofing, waterproofness, and heat insulation. Therefore, a rubber-made elastic member for soundproofing, waterproofing, and heat insulating called a grommet is inserted. Fit into the hole,
It protects the wire harness and blocks the inside and outside of the dash panel. As shown in FIG. 8, the grommet 60 has a large-diameter mounting portion 50 formed of an insulating material with respect to the insertion hole 11 of the dash panel 10 and a small-diameter wire insertion tube portion 51 into which the wire harness 18 is inserted. A hollow inner diameter portion 52 is formed inside the mounting portion 50 to expand toward one opening end. Then, after the wire harness 18 is inserted, the hollow inner diameter portion 52 is filled with a filler 33, so that the wire harness 1
The gap between the grommet 8 and the grommet 60 is sealed.

On the other hand, as a conventional earth circuit of a wire harness for a vehicle, as shown in FIG. 8, for example, as shown in FIG. After electrically connecting the ground wires 56 of the plurality of circuits of the wire harness 18 with the joint terminals 59 to the inside stripped portion, a butyl tape 57 is wound around the connection portion for insulation, waterproofing, and protection. There is a tape on which a joint tape 58 is wound.

[0005] However, such a method requires a lot of man-hours, and the workability of handling the butyl tape 57 is not good due to the adhesive force of the butyl tape 57.
Since the material cost of No. 7 also increased, the manufacturing cost was likely to increase. In addition, when the crimped portion is protected by winding the tape in this manner, the core wire of the crimped portion may break through the tape wound portion by rising, which is not preferable in terms of the quality of the wire harness. Further, when attaching the wire harness 18 to a vehicle body, the ground terminal 55 must be connected to the vehicle body with a bolt, and a connection hole for the ground terminal 55 must be formed in the vehicle body panel. Was.

Therefore, as disclosed in, for example, Japanese Utility Model Laid-Open Publication No. Hei 4-3855, a body grounding means for grounding the ground wire of the wire harness to the vehicle body is provided on the grommet as described above, and the grommet is mounted on the body panel. There has been proposed a body ground structure that can easily take a body ground by being attached to the insertion hole. The grommet having such a body ground structure is mounted in the through hole of the vehicle body panel by providing a contact fitting connected to a ground wire on the surface of the annular mounting groove in the mounting portion of the grommet with respect to the through hole of the vehicle body panel. Body earthing is possible through the grommet contact fittings.

[0007]

However, in the grommet having the body earth structure disclosed in Japanese Utility Model Laid-Open Publication No. Hei 4-3855, the ground wire having one end connected to the contact fitting is formed along the outer peripheral surface of the grommet. Since the grommet is provided, the ground wire may be damaged when the grommet is attached to the insertion hole of the vehicle body panel, and it is difficult to connect the ground wires of a plurality of circuits to the contact fitting. there were. In addition, since the connection between the contact fitting and the ground wire is exposed, water is transmitted through the inside of the ground wire by capillary action from the gap between the ground wire coating and the copper wire and the gap between the copper wires. May enter the vehicle interior space.

Therefore, an object of the present invention is to solve the above-mentioned problem, and it is possible to easily attach the ground wire of the wire harness to the through hole of the vehicle body panel without damaging a plurality of ground wires, and to reliably ground the body of the ground wire of the wire harness. It is an object of the present invention to provide a grommet having a good body grounding structure.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an insertion tube which is formed of an insulating material and whose outer peripheral portion is fitted and held in an insertion hole formed in a vehicle body panel and through which a wire harness is inserted. A grommet body having a hollow inner diameter portion that is expanded toward the one open end on the inner peripheral surface of the portion, and a connection terminal formed to connect a ground terminal of a ground wire projects to the hollow inner diameter portion, A metal joint terminal plate insert-molded in the grommet body so that a part thereof is exposed to an outer peripheral portion of the grommet body,
A grommet comprising a filler filled in the hollow inner diameter portion to seal a joint between the ground terminal and the connection terminal together with a wire harness, and when attaching the grommet to a vehicle body panel, A grommet having a body ground structure is characterized in that a part of the joint terminal plate exposed on the outer peripheral portion of the grommet body is electrically connected to the vehicle body panel.

[0010]

According to the above construction of the present invention, it is easy to form a plurality of tab terminals on the terminal plate protruding from the hollow inner diameter portion, and to easily connect a plurality of ground wires via the ground terminal. In addition, since the ground wire is disposed inside the grommet main body, it is hardly damaged when it is mounted on the vehicle body panel. Further, the ground wire of the wire harness can be easily grounded to the body simply by mounting the grommet in the insertion hole of the vehicle body panel, and water does not enter the ground wire from the connection portion of the ground wire.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a dash panel (body panel) 10 that partitions an engine room and a space inside a vehicle.
The wire harness 18 is inserted into the insertion hole 11 through the grommet 1 according to the present invention fixed to the insertion hole 11 provided in the wire harness 18, and the ground wire 19 of the wire harness 18 is connected to the dash panel 10 by body earthing. Is shown.

The grommet 1 is formed of an insulating material such as rubber and has a large-diameter mounting portion 2 corresponding to the insertion hole 11 of the dash panel 10 and a small-diameter wire insertion tube portion 3 into which the wire harness 18 is inserted. Grommet body 4 having
A joint terminal plate 6 having a plurality of tab-shaped connection terminals 30 formed of a single metal plate and connected to the ground terminal 20 of the ground wire 19; and a hollow formed inside the mounting portion 2. The grommet includes a filler 33 filled in the inner diameter portion 12 and a fixing iron plate 7 mounted on the grommet body 4.

As shown in FIG. 2, the grommet main body 4 has a mounting flange 5 which is a pair of bolt fixing portions extending radially outward on the outer peripheral edge of the mounting portion 2.
The mounting flange 5 is provided with a bolt hole 23 through which the bolt 8 is inserted. 22 is an annular projection for sealing. The mounting portion 2 is provided with an insertion hole 1 at the outer peripheral portion of the mounting flange 5 on the grommet insertion tip side (left side in the figure).
1 has an annular mounting groove 14 in which the fixing iron plate 7 is fitted on the outer peripheral portion of the mounting flange 5 on the rear end side (right side in the figure) of the grommet insertion. Furthermore,
A hollow inner diameter portion 12 is formed on the inner peripheral surface of the attachment portion 2 through which the wire harness 18 is inserted. The hollow inner diameter portion 12 expands from the electric wire insertion tube portion 3 toward the grommet insertion tip side.

As shown in FIG. 3, the joint terminal plate 6 is composed of a plurality of end pieces each having a tip bent at a right angle, and a plurality of end pieces each formed such that each bending position is arranged on an arc. Tab-shaped connection terminal 30 and a bolt through-hole 31 formed at the opposite end of the tab-shaped connection terminal 30. Then, the joint terminal plate 6
When the grommet body 4 is integrally formed, the grommet body 4 is insert-molded along the rear end side surface of one of the pair of mounting flanges 5 where the grommet is inserted. At this time, the joint terminal plate 6 has the tab-shaped connection terminal 30 protruding into the hollow inner diameter portion 12, the tip of which is directed to the opening direction on the grommet insertion tip side, and the bolt through-hole 31.
Coincides with the bolt holes 23 of the mounting flange 5, and a part 25 of the grommet insertion rear end side surface of the joint terminal plate 6 is exposed to the outer peripheral portion of the grommet body 4 (see FIG. 2).

The fixing iron plate 7 is, as shown in FIG.
A substantially rhombus-shaped iron plate that substantially covers the rear end surface of the mounting flange 5 after the grommet is inserted, and a grommet through hole 2 that fits into the iron plate fitting portion 13 of the mounting portion 2 in the center thereof.
6 are formed, and bolt through holes 27 corresponding to the bolt holes 23 of the mounting flange 5 are formed at both ends in the longitudinal direction. An upright portion 28 bent in the grommet mounting direction is formed on the outer peripheral edge thereof, and is fitted into an iron plate fitting groove 24 formed on a rear end side surface of the mounting flange 5 after the grommet is inserted. Further, on the outer peripheral edge, grommet peeling preventing ribs 29 arranged at appropriate intervals are provided.
The grommet exfoliation preventing ribs 29 are inserted into corresponding exfoliation preventing rib receiving portions (not shown) of the mounting flange 5 to be locked, so that the grommet main body 4 and the fixing iron plate 7 are connected to each other. Peeling can be prevented.

Next, a procedure for assembling the grommet 1 will be described. First, in order to attach the fixing iron plate 7 to the grommet main body 4, the fixing iron plate 7 is pressed against the mounting flange 5. Then, the grommet through hole 26 is fitted into the iron plate fitting portion 13 of the mounting portion 2, the upright portion 28 is fitted into the iron plate fitting groove 24, and the grommet peeling prevention rib 29 is provided on the mounting flange 5. Locked to the receiving part. Therefore, the fixing iron plate 7 is attached to the side surface of the mounting flange 5 at the rear end of the grommet insertion. At this time, a part of the mounting surface side is a part 25 of the rear end surface of the joint terminal plate 6 at the grommet insertion side. , And it becomes conductive.

Next, as shown in FIG. 5, a wire harness 18 is inserted through the grommet main body 4 and a ground terminal 20 fixed to an end of a ground wire 19 of the wire harness 18 is connected to the hollow inner diameter portion 12. Is connected to the tab-shaped connection terminal 30 of the joint terminal plate 6 protruding from the grommet main body 4, and the electric wire insertion cylindrical portion 3 of the grommet main body 4 is wound with a tape 17. Then, the hollow inner diameter portion 12 is opened with the open end thereof facing upward.
Is filled with a filler 33 having excellent insulation, heat resistance and oil resistance, such as epoxy resin or silicone resin, from a filler injection nozzle 32. Since the joint between the ground terminal 20 and the tab-shaped connection terminal 30 is set inward from the formation position of the filler separation preventing rib 16 formed on the open end side of the hollow inner diameter portion 12. , Its surroundings are completely filled and closed. Therefore, the gap between the covering of the ground wire 19 and the core of the electric wire and the gap between the cores of the electric wire are also reliably sealed by the filler 33.

Next, after the filler material 33 is solidified, first, one end of the wire harness 18 is inserted into the insertion hole 11 of the dash panel 10 and the grommet 1 is inserted into the insertion hole 1.
Fit into 1. At this time, since the ground wire 19 is located radially inward of the outer peripheral portion of the mounting portion 2, the ground wire 19 is damaged by being sandwiched between the insertion hole 11 and the outer peripheral portion of the mounting portion 2. There is no danger.

Then, the bolt 8 penetrating the bolt through hole 27 of the fixing iron plate 7 and the bolt hole 23 of the mounting flange 5 is inserted into the mounting bolt hole of the dash panel 10 and fastened to the nut 9. As a result, the grommet 1 is fixed to the dash panel 10 and
The fixing iron plate 7 and the dash panel 10 can be conducted through the bolt 8 and the nut 9. Therefore, the joint terminal plate 6 that is in conduction with the fixing iron plate 7 is connected to the dash panel 1.
0 and is electrically connected to the ground line 19,
Can be connected to the body ground.

Therefore, the ground wire 19 of the wire harness 18 can be easily grounded by attaching the grommet 1 to the insertion hole 11 without providing a special ground connection portion on the vehicle body. Also,
Since the ground wire 19 only connects the ground terminal 20 fixed to the end to the tab-shaped connection terminal 30 of the joint terminal plate 6, a large number of tab-shaped connection terminals 30 are formed on the joint terminal plate 6 in advance. If so, multiple ground connections are also easy.

In the grommet 1 of the above embodiment, the joint terminal plate 6 is insert-molded only on one of the pair of mounting flanges 5, but the joint terminal plate 6 is insert-molded on both of the mounting flanges 5. It is also possible. FIG. 6 shows a state in which the wire harness 18 is inserted into the insertion hole 11 via the grommet 40 according to another embodiment of the present invention, and the ground wire 19 of the wire harness 18 is body-grounded to the dash panel 10. ing.

The grommet 40 includes a dash panel 1
The grommet main body 44 has a large-diameter mounting portion 42 corresponding to the zero insertion hole 11 and a small-diameter wire insertion tube portion 43 into which the wire harness 18 is inserted, and a ground wire 19 formed of a single metal plate. Joint terminal plate 46 having a plurality of tab-shaped connection terminals 30 to which the ground terminal 20 is connected
And a hollow inner diameter portion 4 formed inside the mounting portion 42.
5 to be filled.

The grommet main body 44 includes a mounting portion 42
An annular mounting groove 47 into which the insertion hole 11 is fitted is provided on the outer peripheral portion of the grommet from the wire insertion cylindrical portion 43 to the inner peripheral surface of the mounting portion 42 through which the wire harness 18 is inserted. ) Is formed to have a hollow inner diameter portion 45 that expands toward (). As shown in FIG. 7, the joint terminal plate 46 includes a plurality of end pieces each having a tip bent at a right angle, and a plurality of tabs formed such that each bending position is arranged on an arc. The connection terminal 30 and the annular mounting groove 4 are formed in the opposite edge of the tab-shaped connection terminal 30.
7 and an upright portion 41 bent so as to be attached to the bottom portion.

When the grommet main body 44 is formed integrally with the joint terminal plate 46, the tab-shaped connection terminal 30 projects into the hollow inner diameter portion 45 and its tip is directed toward the rear end side opening direction of the grommet insertion. At the same time, insert molding is performed such that the upright portion 41 is exposed at the bottom of an annular mounting groove 47 formed on the outer peripheral portion of the grommet main body 44.

Next, the procedure for assembling the grommet 40 will be described. First, the wire harness 18 is inserted through the grommet body 44, and the ground terminal 20 fixed to the end of the ground wire 19 of the wire harness 18 is connected to the joint terminal plate 46 protruding from the hollow inner diameter portion 45 by a tab-like connection. The grommet body 44 is connected to the terminal 30, and the wire insertion tube 43 of the grommet body 44 is wound with the tape 17.

Then, the filler 33 is injected and filled into the hollow inner diameter portion 45 with the opening end facing upward. Since the joint between the ground terminal 20 and the tab-shaped connection terminal 30 is set on the inner side of the position where the filler separation preventing rib 48 formed on the open end side of the hollow inner diameter portion 45 is formed. , Its surroundings are completely filled and closed. Therefore, the gap between the covering of the ground wire 19 and the core of the electric wire and the gap between the cores of the electric wire are also reliably sealed by the filler 33.

Next, after the filler material 33 is solidified, first, one end of the wire harness 18 is inserted into the insertion hole 11 of the dash panel 10, and the grommet 40 is fitted into the insertion hole 11. Then, the insertion hole 11 becomes the annular mounting groove 4.
7, the grommet 40 is fixed to the dash panel 10, and the upright portion 41 exposed at the bottom of the annular mounting groove 47 comes into contact with the inner peripheral surface of the insertion hole 11,
Conduction becomes possible. Therefore, the joint terminal plate 46 is electrically connected to the dash panel 10 to be conductive, and the ground wire 19 can be connected to the body ground.

Therefore, similarly to the grommet 1 of the above-described embodiment, the ground wire 19 of the wire harness 18 can be easily mounted on the body by mounting the grommet 40 in the insertion hole 11 without providing a special ground connection portion on the vehicle body. Since it is possible to take the ground, and only the grounding terminal 20 fixed to the end is connected to the tab-like connection terminal 30 of the joint terminal plate 46, a large number of tab-like connection terminals 30 are previously connected to the joint terminal plate 46. If formed, a large number of ground connections are also easy.

It should be noted that the present invention is not limited to the above-described embodiments, but can take various forms based on the gist of the present invention. For example, it goes without saying that the shape of the grommet body and the shape of the joint terminal plate can take various shapes. For example, the cross-sectional shape of each of the sealing annular projections may be a triangular shape instead of the round shape as in the embodiment. Also, each seal portion does not need to be a sealing annular protrusion as in the above embodiment, and may be a seal portion wider in the axial direction.

Further, the positional relationship between the first seal portion and the second seal portion is not limited to that of the above-described embodiment. For example, the first seal portion is located outside the casing from the second seal portion. It is also possible to configure so that

[0031]

According to the grommet having the body ground structure of the present invention, it is easy to form a plurality of tab terminals on the terminal plate protruding from the hollow inner diameter portion of the grommet main body. A plurality of ground wires can be easily connected, and since the ground wires are disposed inside the grommet main body, they are not easily damaged when mounted on a vehicle body panel or the like. Further, the ground wire of the wire harness can be easily grounded to the body simply by attaching the grommet to the insertion hole of the vehicle body panel. Furthermore, the connection of the ground wire is reliably sealed by the filler. Therefore,
It is possible to provide a grommet having a good body grounding structure that can be easily attached to the insertion hole of the vehicle body panel without damaging a plurality of grounding wires, and can reliably ground the grounding wire of the wire harness to the body.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a grommet having a body ground structure according to an embodiment of the present invention.

FIG. 2 is an exploded sectional view of the grommet main body and a fixing iron plate shown in FIG.

FIG. 3 is an overall perspective view of the joint terminal plate shown in FIG.

FIG. 4 is a front view of the fixing iron plate shown in FIGS. 1 and 2;

FIG. 5 is a partial cross-sectional view for explaining a procedure for assembling the grommet having the body ground structure shown in FIG.

FIG. 6 is a partial cross-sectional view illustrating a grommet having a body ground structure according to another embodiment of the present invention.

7 is an overall perspective view of the joint terminal plate shown in FIG.

FIG. 8 is a schematic sectional view showing a ground circuit and a grommet of a conventional automobile wire harness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grommet 2 Mounting part 3 Wire insertion cylinder part 4 Grommet main body 5 Mounting flange 6 Joint terminal plate 7 Fixing iron plate 8 Bolt 9 Nut 10 Dash panel 11 Insertion hole 12 Hollow inner diameter part 13 Iron plate fitting part 14 Ring mounting groove 16 Filling Material separation prevention rib 17 Tape 18 Wire harness 19 Ground wire 20 Ground terminal

Claims (1)

(57) [Scope of request for utility model registration] An outer peripheral portion is fitted and held in an insertion hole formed of an insulating material and opened in a vehicle body panel.
A grommet body having a hollow inner diameter portion that expands toward the one open end side on the inner peripheral surface of the insertion cylindrical portion through which the wire harness is inserted, and a connection terminal formed to connect a ground terminal of a ground wire, A metal joint terminal plate insert-molded into the grommet body so as to protrude into the hollow inner diameter part and partially expose the outer periphery of the grommet body, and a joint between the ground terminal and the connection terminal And a filler filled in the hollow inner diameter portion to seal the grommet together with a wire harness, the joint terminal being exposed on an outer peripheral portion of the grommet body when the grommet is mounted on a vehicle body panel. A grommet having a body ground structure, wherein a part of the plate is electrically connected to the vehicle body panel.