JPH0591997U - Grommet with body earth structure - Google Patents

Abstract

(57) [Abstract] [Purpose] It has a good body ground structure that can be easily installed in the insertion hole of the vehicle body panel without damaging multiple ground wires and can securely ground the ground wire of the wire harness. Providing grommets. A grounding terminal 20 of a grounding wire 19 is connected to a grommet body 4 having a hollow inner diameter portion 12 that widens toward an opening end side on an inner peripheral surface of a mounting portion 2 through which a wire harness 18 is inserted. The joint terminal plate 6 is insert-molded so that the tab-shaped connection terminal thus formed protrudes into the hollow inner diameter portion 12 and a part of the tab-shaped connection terminal is brought into contact with the fixing iron plate 7 attached to the grommet body 4. The joint between the grounding terminal 20 and the tab-shaped connection terminal is sealed with a filler 33. The joint terminal plate 6 and the dash panel 10 are electrically connected by bolts and nuts for fixing the grommet 1 to the dash panel 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grommet used for protecting an automobile wire harness that penetrates a vehicle body panel, and more particularly to a grommet having a body earth structure for earthing the earth wire of the wire harness to the vehicle body.

[0002]

[Prior Art]

 Generally, an insertion hole is provided in a dash panel (vehicle body panel) that separates an automobile engine room from an interior space of a vehicle, and a wire harness penetrates the dash panel. In order to facilitate the connection work after inserting the wire harness into the dash panel, the front end is connected to the connector in advance, and the insertion hole has an inner diameter sufficient to insert the connector. There is.

Therefore, since a large opening is formed in the dash panel as it is, and it is not preferable in terms of soundproofing, waterproofness and heat insulation, a rubber soundproofing, waterproofing and heat shielding elastic member called a so-called grommet is used. It fits into the insertion hole to protect the wire harness and block the inside and outside of the dash panel. As shown in FIG. 8, the grommet 60 includes a large-diameter mounting portion 50 formed of an insulating material for the insertion hole 11 of the dash panel 10 and a small-diameter wire insertion tubular portion 51 through which the wire harness 18 is inserted. A hollow inner diameter portion 52 is formed inside the mounting portion 50, the hollow inner diameter portion 52 expanding toward the one opening end side. After the wire harness 18 is inserted, the hollow inner diameter portion 52 is filled with the filling material 33 to seal the gap between the wire harness 18 and the grommet 60.

On the other hand, as a conventional grounding circuit of a wire harness for an automobile, as shown in FIG. 8, for example, a part of a grounding base wire 54 having a grounding terminal 55 crimped at the end for vehicle attachment is peeled off. Then, the ground wire 56 of the plurality of circuits of the wire harness 18 is caulked to the inner stripped portion with the joint terminal 59 to electrically connect it, and then the butyl tape 57 is attached to this connection portion for insulation, waterproofing and protection. In some cases, the tape is wound and then a joint tape 58 is wound on the tape.

However, such a method requires a lot of man-hours and has poor workability in handling the butyl tape 57 due to its adhesive strength before being held, and the material cost of the butyl tape 57 increases, so that the manufacturing cost tends to increase. It was Further, when the crimped portion is protected by winding the tape in this way, the wire core wire of the crimped portion may break through the tape winding portion when it rises, which is not preferable in terms of the quality of the wire harness. There wasn't. Further, when the wire harness 18 is attached to the vehicle body, it is necessary to connect the grounding terminal 55 to the vehicle body with a bolt, and a connecting hole for the grounding terminal 55 is formed in the vehicle body panel. I had to.

Therefore, as disclosed in, for example, Japanese Utility Model Laid-Open No. 4-3855, 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 vehicle body panel. A body grounding structure has been proposed in which the body grounding can be easily performed by mounting it in the insertion hole of the. A grommet having such a body ground structure can be attached to a body panel insertion hole by providing a contact metal fitting, which is connected to the ground wire, on the surface of the annular mounting groove in the mounting portion of the grommet with respect to the body panel insertion hole. Body grounding is possible via the grommet contact fittings.

[0007]

[Problems to be solved by the device]

 However, in the grommet having the body ground structure disclosed in Japanese Utility Model Laid-Open No. 4-3855, the ground wire whose one end is connected to the contact fitting is arranged along the outer peripheral surface of the grommet, and therefore the grommet is used. There is a possibility that the ground wire may be damaged when the vehicle is attached to the insertion hole of the vehicle body panel, and it is difficult to connect the ground wire of a plurality of circuits to the contact fitting. In addition, since the connection between the contact metal fitting and the ground wire is exposed, water will be transmitted through the interior of the ground wire by the capillary phenomenon from the clearance between the coating of the ground wire and the copper wire and the clearance between the copper wires. May enter the space inside the vehicle.

[0008] Therefore, an object of the present invention is to solve the above problems, and it is possible to easily attach a plurality of ground wires to an insertion hole of a vehicle body panel without damaging them, and securely connect the ground wire of the wire harness to the body. An object of the present invention is to provide a grommet having a good body ground structure that can be grounded.

[0009]

[Means for Solving the Problems]

 The above object of the present invention is to form an opening in the inner peripheral surface of the insertion tube portion through which the wire harness is inserted, while the outer peripheral portion is fitted and held in the insertion hole formed in the vehicle body panel and formed of an insulating material. The grommet body having a hollow inner diameter portion that widens toward the end side, and the connection terminal formed to connect the grounding terminal of the ground wire protrudes into the hollow inner diameter portion, and part of it is the outer circumference of the grommet body. The metal joint terminal plate that is insert-molded into the grommet body so as to be exposed to the portion and the hollow inner diameter portion for sealing the joint portion of the earth terminal and the connection terminal together with the wire harness. A grommet having a filling material for filling the grommet with a body panel, the one part of the joint terminal plate exposed to an outer peripheral portion of the grommet body. There is achieved by a grommet having a body earth structure, characterized in that it is connected to the vehicle body panel and electrically.

[0010]

[Action]

 According to the above configuration of the present invention, it is easy to form a plurality of tab terminals on the terminal plate protruding into the hollow inner diameter portion, and it is possible to easily connect a plurality of ground wires via the ground terminal. In addition, since the ground wire is provided inside the grommet body, it is not easily 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 through hole of the vehicle body panel, and water does not enter the ground wire from the connection part of the ground wire.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows that a wire harness 18 is inserted through the insertion hole 11 through a grommet 1 of the present invention which is fixed to an insertion hole 11 provided in a dash panel (vehicle body panel) 10 which divides an engine room and an interior space of an automobile. The ground wire 19 of the wire harness 18 is body-grounded to the dash panel 10.

The grommet 1 is made 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. A grommet body 4 having a plurality of tabs, a joint terminal plate 6 having a plurality of tab-shaped connection terminals 30 formed of a single metal plate to which the grounding terminals 20 of the ground wire 19 are connected, and the mounting portion 2 A filling material 33 filled in the hollow inner diameter portion 12 formed inward and a fixing iron plate 7 attached to the grommet body 4 are provided.

As shown in FIG. 2, the grommet body 4 has a mounting flange 5 which is a pair of bolt fixing portions extending outward in the radial direction on the outer peripheral edge of the mounting portion 2. The flange 5 is provided with a bolt hole 23 for inserting the bolt 8. 22 is an annular protrusion for sealing. Further, the mounting portion 2 has an annular mounting groove 14 into which the insertion hole 11 fits in the outer peripheral portion of the mounting flange 5 on the grommet insertion tip side (left side in the figure), and the grommet insertion rear end of the mounting flange 5 is attached. An iron plate fitting portion 13 into which the fixing iron plate 7 is fitted is provided on the outer peripheral portion of the side (right side in the figure). Further, a hollow inner diameter portion 12 is formed on the inner peripheral surface of the mounting portion 2 through which the wire harness 18 is inserted, the hollow inner diameter portion 12 expanding from the wire insertion tubular 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 each bent position is formed on an arc. It has a plurality of tab-shaped connection terminals 30 and a bolt through hole 31 formed at an end portion on the opposite side of the tab-shaped connection terminals 30. Then, when the grommet body 4 is integrally molded, the joint terminal plate 6 is insert-molded along the side surface of the grommet insertion rear end of one of the pair of mounting flanges 5. At this time, in the joint terminal plate 6, the tab-shaped connection terminal 30 projects into the hollow inner diameter portion 12 and the tip thereof is directed toward the grommet insertion tip side opening direction, and the bolt through hole 31 is the bolt hole of the mounting flange 5. 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 main body 4 (see FIG. 2).

As shown in FIG. 4, the fixing iron plate 7 is a substantially diamond-shaped iron plate that substantially covers the rear end side surface of the mounting flange 5 into which the grommet is inserted, and the iron plate of the mounting portion 2 is located at the center thereof. Grommet through holes 26 that fit into the fitting portion 13 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 thereof. Further, 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 the grommet insertion rear end side surface of the mounting flange 5. Further, grommet peeling prevention ribs 29 arranged at appropriate intervals are formed on the outer peripheral edge, and the grommet peeling prevention ribs 29 correspond to the peeling prevention rib receiving portions (not shown) of the mounting flange 5. It is possible to prevent the grommet body 4 and the fixing iron plate 7 from peeling off by inserting and locking them in the.

Next, a procedure for assembling the grommet 1 will be described. First, in order to attach the fixing iron plate 7 to the grommet body 4, the fixing iron plate 7 is applied to the attachment flange 5 and pressed. Then, the grommet through hole 26 fits 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 prevents the peeling prevention of the mounting flange 5. It is locked to the stop rib receiving portion. Therefore, the fixing iron plate 7 is attached to the grommet insertion rear end side surface of the mounting flange 5. At this time, a part of the mounting surface side is one side of the grommet insertion rear end side surface of the joint terminal plate 6. It comes into surface contact with the portion 25 and becomes conductive.

Next, as shown in FIG. 5, the wire harness 18 is inserted into the grommet body 4, and the earth terminal 19 fixed to the end of the ground wire 19 of the wire harness 18 is fixed to the hollow inner diameter. It is connected to the tab-shaped connection terminal 30 of the joint terminal plate 6 protruding to the portion 12, and the wire insertion tube portion 3 of the grommet body 4 is wound with the tape 17. Then, with the open end facing upward, inside the hollow inner diameter portion 12, a filler 33 having excellent insulating properties, heat resistance and oil resistance, such as epoxy resin or silicone resin, is injected from the filler injection nozzle 32. Inject and fill. The joint between the grounding terminal 20 and the tab-shaped connecting terminal 30 is set on the inner side of the formation position of the filler peeling prevention rib 16 formed on the open end side of the hollow inner diameter portion 12. Therefore, the surrounding area is completely filled and closed. Therefore, the gap between the coating of the ground wire 19 and the core of the electric wire and the gap between the cores of the electric wire are reliably sealed by the filler 33.

Next, after the filling 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 11. 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 sandwiched between the insertion hole 11 and the outer peripheral portion of the mounting portion 2 and damaged. 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 with 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 electrically connected via the bolt 8 and the nut 9. Therefore, the joint terminal plate 6 electrically connected to the fixing iron plate 7 is electrically connected to the dash panel 10 so as to be electrically conductive, and the earth wire 19 can be body-grounded.

Therefore, the ground wire 19 of the wire harness 18 can be easily grounded by mounting the grommet 1 in the insertion hole 11 without providing a special grounding connection portion on the vehicle body. Further, since the ground wire 19 only connects the grounding terminal 20 fixed to its end to the tab-shaped connection terminal 30 of the joint terminal plate 6, a large number of tab-shaped connection terminals are previously attached to the joint terminal plate 6. If 30 is formed, many ground connections are 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. Shows.

The grommet 40 includes a grommet main body 44 having a large-diameter mounting portion 42 corresponding to the insertion hole 11 of the dash panel 10 and a small-diameter electric wire insertion tubular portion 43 through which the wire harness 18 is inserted. A joint terminal plate 46 having a plurality of tab-shaped connecting terminals 30 to which the grounding terminals 20 of the ground wire 19 are connected, and a hollow inner diameter portion 45 formed inside the mounting portion 42. And a filling material 33 to be filled in.

The grommet body 44 has a ring-shaped mounting groove 47 into which the insertion hole 11 fits in the outer peripheral portion of the mounting portion 42, and the electric wire insertion hole is inserted into the inner peripheral surface of the mounting portion 42 into which the wire harness 18 is inserted. A hollow inner diameter portion 45 is formed to expand from the cylindrical portion 43 toward the grommet insertion rear end side (left side in the drawing). As shown in FIG. 7, the joint terminal plate 46 is composed of a plurality of end pieces each having a tip bent at a right angle, and a plurality of tab-like parts formed so that the respective bending positions are arranged on an arc. It has a connection terminal 30 and an upright portion 41 that is bent and formed at the opposite edge of the tab-shaped connection terminal 30 so as to follow the bottom of the annular mounting groove 47.

In the joint terminal plate 46, when the grommet body 44 is integrally molded, the tab-shaped connection terminal 30 projects into the hollow inner diameter portion 45 and the tip thereof is in the grommet insertion rear end side opening direction. And the upright portion 41 is exposed to the bottom of the annular mounting groove 47 formed in the outer peripheral portion of the grommet body 44, and is insert-molded.

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

Then, the filler 33 is injected and filled into the inside of the hollow inner diameter portion 45 with the open end facing upward. The joint between the grounding 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. Therefore, the surrounding area is completely filled and closed. Therefore, the gap between the coating of the ground wire 19 and the core of the electric wire and the gap between the cores of the electric wire are reliably sealed by the filler 33.

Next, after the filling material 33 is solidified, first, one end portion of the wire harness 18 is inserted into the insertion hole 11 of the dash panel 10 and the grommet 40 is inserted into the insertion hole 11. Then, the insertion hole 11 is fitted into the annular mounting groove 47 to fix the grommet 40 to the dash panel 10, and the standing portion 41 exposed at the bottom of the annular mounting groove 47 is inserted into the insertion hole 11. It comes into contact with the inner peripheral surface and becomes conductive. There, the joint terminal plate 46 is electrically connected to the dash panel 10 so that it can be conducted, and the ground wire 19 can be connected to the body ground.

Therefore, like the grommet 1 of the above-described embodiment, the ground wire 19 of the wire harness 18 can be easily attached to the insertion hole 11 of the grommet 40 without installing a special grounding connection portion on the vehicle body. Since it becomes possible to connect to the ground and the grounding terminal 20 fixed to the end thereof is simply connected to the tab-shaped connecting terminal 30 of the joint terminal board 46, a large number of tab-shaped connecting terminals are previously attached to the joint terminal board 46. If 30 is formed, a large number of ground connections will be easy.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various forms can be adopted 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 be various shapes. For example, the sectional shape of each of the sealing annular projections may be a triangular shape instead of the R shape as in the embodiment. Further, each sealing portion does not have to be the sealing annular projection as in the above embodiment, but may be a sealing 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 in the above embodiment, and the first seal portion is located on the outer side of the casing with respect to the second seal portion, for example. It can also be configured to do so.

[0031]

[Effect of the device]

 That is, according to the grommet having the body earth structure of the present invention, it is easy to form a plurality of tab terminals on the terminal plate protruding into the hollow inner diameter portion of the grommet body, and a plurality of earth terminals are provided through the earth terminal. Since the wire can be easily connected and the ground wire is arranged inside the grommet body, it is not easily 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. Further, the connecting portion of the ground wire is securely sealed by the filling material. Therefore, it is possible to provide a grommet having a good body grounding structure that can be easily mounted in the insertion hole of the vehicle body panel without damaging the plurality of grounding wires and can securely ground the grounding wire of the wire harness. ..

[Brief description of drawings]

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

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

3 is an overall perspective view of the joint terminal board shown in FIG. 1. 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 an assembling procedure of the grommet having the body ground structure shown in FIG.

FIG. 6 is a partial cross-sectional view showing a mounted state of 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 cross-sectional view showing a ground circuit and a grommet of a conventional automobile wire harness.

[Explanation of symbols]

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

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral portion is fitted and held in an insertion hole formed of an insulating material and formed in an opening in a vehicle body panel,
The grommet main body having a hollow inner diameter portion that expands toward the one opening end side on the inner peripheral surface of the insertion tubular portion through which the wire harness is inserted, and the connection terminal formed to connect the ground terminal of the ground wire A joint terminal plate made of metal that is insert-molded into the grommet body so that a part thereof is exposed to the outer peripheral portion of the grommet body while protruding into the hollow inner diameter portion, and a joint portion between the grounding terminal and the connection terminal. A grommet having a filling material filled in the hollow inner diameter portion for sealing with a wire harness, the joint terminal being exposed to 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.