JP2560215Y2 - Ground structure of wire harness - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a ground structure of a wire harness provided in an automobile.

"Conventional technology" Of the grounding structure of the wire harness, a grounding structure using a wire harness forming protector (hereinafter, simply referred to as a forming protector) used for adjusting an arrangement posture of the wire harness to a vehicle body is actually opened. Japanese Patent Application Laid-Open No. Sho 60-162376 and Japanese Utility Model Publication No. 1-27564 disclose such techniques.

In other words, the former one of this known ground structure is a ground terminal connector in which the ground wires of the wire harness are aggregated,
It is connected to the relay terminal provided on the molded protector, and the plate-shaped connection portion of the relay terminal is fixed to the vehicle body with bolts to ground the vehicle body. The latter is a mounting hole for the molded protector on the outer periphery of the side wall of the molded protector. A copper foil pattern portion having a connector insertion portion is provided at a peripheral portion, and the same ground terminal connector as the former is connected to the copper foil pattern portion, and the vehicle body is grounded by bolting and fixing to the vehicle body.

[Problem to be Solved by the Invention] The ground structure of the wire harness using the known molded protector uses the mounting portion of the molded protector to the vehicle body. Accordingly, there is an advantage that an earth circuit to the vehicle body can be formed. However, since the connection point between the ground wire group of the wire harness and the vehicle body, that is, the ground point, is configured as a single point, the ground circuit may be damaged due to vibration of the vehicle body, damage to the mounting portion, loosening of the mounting bolt, or improper tightening of the mounting bolt. In addition, there is a problem in reliability that causes poor conduction of the relay.Furthermore, in the former, it is necessary to arrange the relay terminal so as to extend inside and outside the molded protector. , The ground point must be limited to the end of the molded protector.
It is necessary to pull out the ground terminal connector to the outside of the molded protector and connect it to the copper foil pattern part.Similarly, the ground point is limited at the end of the molded protector and slits etc. are provided to pull out the ground terminal connector to the outside Inevitably, the degree of freedom in the design of the ground circuit of the wire harness is limited, and the outer exposed type lacks protection against external force. In addition, the mechanical strength of the molded protector is reduced due to slits and the like.

The present invention provides an earthing structure that solves the above-mentioned drawbacks of the conventional means.

[Means for Solving the Problems] The grounding structure of the present invention that solves the above-mentioned technical problems is formed integrally with a busbar flange portion extending in a direction in which the wire harness is accommodated, along a side circumference of the wire harness forming protector. In addition, a plurality of “attached portions having an arbitrary interval and having a mounting hole for mounting bolts to the vehicle body” are provided on the bus bar flange portion, and the “bus bar” is provided beside the bar-shaped common conducting portion. A ground bus bar having a plurality of branch conductive portions having a space corresponding to the mounting portion of the flange portion for mounting, and having a mounting hole for a mounting bolt to the vehicle body, is mounted on the bus bar flange portion. The two mounting holes are overlapped, and the plurality of branch conducting portions of the ground bus bar are connected to and connected to the ground wire of the wire harness, respectively. Structure forms a scan circuit at a plurality of connection points, but a summary.

[Effect] The earth structure of the present invention having the above-described structure is configured such that the earth wire of the wire harness is electrically connected to the vehicle body via an earth bus bar having a plurality of branch conducting portions protruding from the common conducting portion. A single ground wire forms a ground circuit through a plurality of ground points, improving the reliability of the ground circuit and providing an electrically conductive metal bus bar to the molded protector. The target strength is improved.

Furthermore, since the connection means between the ground bus bar and the ground wire can use connection holes in the peripheral wall of the molded protector, there are few restrictions on the position where the ground wire is drawn out, and the degree of freedom in designing the ground circuit of the wire harness is improved. . Since the entire grounding circuit is covered by the bus bar flange portion, it is well protected against external force.

"Example" Hereinafter, a detailed description will be given based on an example. First, referring to FIG. 1 showing the first embodiment of the present invention, a hollow rectangular cylindrical shaped protector 2 for inserting and housing a wire harness 1 in a hollow portion 3 to adjust the arrangement posture of the wire harness 1 includes: A busbar flange portion 4 extending in the housing direction of the wire harness 1 along one side of the upper end side edge is integrally formed,
At both ends of the busbar flange 4, a tongue-shaped mounting portion 5A5B that protrudes outward from the busbar flange 4 is projected, and a mounting bolt 7 is provided at the center of the mounting portion 5A5B. An attachment hole 6A is formed to serve as an attachment portion to the vehicle body.

On the other hand, two branch conductive portions 9 formed by bending both ends of a bar-shaped common conductive portion 8 shown in FIG. 1 (B) in the same direction are laterally projected and attached to the end of the branch conductive portion 9. A ground bus bar 10 of a metallic electric conductor provided with a mounting hole 6B for the bolt 7 is formed as a separate object, and this ground bus bar 10 is inserted into the bus bar flange 4 of the molded protector 2 and embedded therein. The branch conducting portions 9 at both ends are 2
The mounting holes 6A of the bus bar flange 4 and the mounting holes 6B of the branch conduction portion 9 are concentrically overlapped with each other and embedded in the mounting portions 5A5B to receive the mounting bolts 7.

A grounding terminal 12 having a mounting hole 6C is provided on a grounding wire 11 of the wire harness 1. The grounding wire 11 is drawn out from both ends of the molded protector 2 and guided to a lower side of the busbar flange 4 for branch conduction. It is superimposed below the mounting hole 6B of the part 9, and it is fastened to the vehicle body 13 through the mounting bolt 6 through the mounting hole 6B6C that has been superimposed, and the lower ground terminal 12 is connected to and conductive to the vehicle body 13 to form an earth circuit. The ground wire 11 is connected at two points to the vehicle body 13 via the two branch conducting portions 9 of the ground bus bar 4, so that a two-point ground circuit is formed.

The mounting hole 6A of the mounting portion 5A5B has a large size that, when the mounting bolt 7 is inserted and tightened, receives the head of the mounting bolt 7 and directly contacts the branch to the branch conducting portion 9. .

Next, another embodiment of the ground structure of the present invention will be described with reference to FIGS. First, in the second embodiment, the same plurality of branch conducting portions 9 and common conducting portions 8 as described above are connected to the bus bar flange portion 4 provided along the upper edge of the U-shaped groove-shaped protector 2 opened upward. Become earth busbar 10
Is mounted in a bus bar groove 14 formed below the bus bar flange 4. And that busbar for earth
At 10, a connecting piece 15 that extends from the common conducting portion 8 in the direction of the molded protector 2 and extends is provided with a male terminal 16, and the male terminal 16 is connected to a connection hole 17 formed in the peripheral wall of the molded protector 2. Sticking out.

Then, as shown in FIG. 2 (B), the female terminal 18 of the ground wire of the wire harness 1 is connected to the male terminal 16 of the bus bar 10 for grounding, and the mounting portion 5A of the flange portion 4 for the bus bar is connected.
5B is fastened to the vehicle body 13 through the mounting bolt 7 so that the ground wire 11 is two-point grounded to the vehicle body 13 via the ground bus bar 4.

On the other hand, the one shown in FIG. 3 connects the male terminal 16 of the ground wire 11 and the female terminal 18 of the grounding bus bar 4 protruding into the connection hole 17 provided on the peripheral wall of the molded protector 2 as shown in the second illustration. In the same manner as in the embodiment shown in FIG. 2, a ground wire 11 is connected to a two-point ground via a ground bus bar 10.

In the ground structure of the above embodiment, the ground wire 11 of the wire harness is electrically connected to the vehicle body 13 via the ground bus bar 10 having at least two branch conductive portions 9 to form a ground circuit. There are a plurality of ground points for one ground wire 11, and the mounting portion of the molded protector 2 that is loosened or improperly tightened with the mounting bolts 7 or the weight of the wire harness is damaged by body vibration or the like. Even if a point becomes defective, the earth circuit is guaranteed by another earth point, and the earth reliability is improved. The presence of the grounding bus bar 10 enhances the mechanical strength of the heavy mounting part of the molded protector 2 on the vehicle body, thereby improving the protector function. Since a connection portion with the bus bar 10 can be provided, the degree of freedom in ground circuit design is improved.

In the present invention, at least two or more branch conductive portions 9 of the ground bus bar 10 are required to be provided for the common conductive portion 8 with the intention of providing a plurality of ground points.
The present invention is not limited to the two embodiments. And
Busbar flange 4 for mounting the ground busbar 10
Is provided at an arbitrary intermediate position of a normal molding protector having a long and intermediate curved portion, or a short and small molding protector serving also as an earth circuit, as in the above embodiment,
It may be arbitrarily arranged at an intermediate position of a long wire harness. The ground bus bar 10 may be attached to the bus bar flange 4 by any fixing means such as adhesion, rivet fixation, or fixing of the presser lid, or the like. It may be only attached.

"Effects of the invention" As described above, the grounding structure of the wire harness of the invention improves the quality and reliability of the grounding circuit,
This has the effect of improving the protector function of the molded protector and the degree of freedom in designing the ground circuit of the wire harness.

[Brief description of the drawings]

FIG. 1 shows a ground structure of a wire harness according to a first embodiment of the present invention, wherein (A) is a perspective view, (B) is a perspective view of a grounding bus bar, (C) is a side view of (A), Figure 2:
FIG. 3A is a perspective view of the wire harness according to another embodiment of the present invention, FIG. 3B is a side view of FIG. 3A, FIG. Side view of ground structure Main code, 1: Wire harness, 2: Protector for wire harness, 3: Hollow, 4: Flange for bus bar, 5A5
B: mounting part, 6A6B6C: mounting hole, 7: mounting bolt, 8: common conductive part, 9: branch conductive part, 10: ground bus bar, 11: ground wire, 12: ground terminal, 13: body, 14: Busbar groove, 15: connection piece, 16: male terminal, 17: connection hole, 18: female terminal

Claims (1)

(57) [Scope of request for utility model registration] 1. A busbar flange portion extending in a housing direction of a wire harness is integrally formed along a side circumference of a molded protector for a wire harness. A plurality of mounting portions having mounting holes for mounting bolts to the vehicle body, and furthermore, `` having a space corresponding to the mounting portion of the busbar flange portion on the side of the bar-shaped common conducting portion, and A grounding bus bar having a plurality of branch conducting portions having mounting holes for mounting bolts to the bus bar flange is mounted on the bus bar flange portion so that both mounting holes are overlapped, and the ground bus bar and the ground of the wire harness are grounded. A grounding structure for a wire harness, characterized in that a grounding circuit is formed at a plurality of connection points by connecting and conducting a wire to the vehicle body via the grounding bus bar.