JP3041397B2 - Connection structure of underbody circuit for automobile - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connection structure of an underbody circuit unit that is unit-coupled to a vehicle body instead of a wire harness for an automobile.

[Conventional technology]

FIG. 5 shows a state of wiring of a wire harness in an automobile.

The wire harness w is fixed to the vehicle body 29 with a large number of clamps 30, and a protector 31 made of a synthetic resin is mounted on the floor and the like for protection. A grommet 32 made of rubber is fitted to a portion to be introduced into the cabin to prevent moisture and the like from entering the cabin. Then, it is connected via a connector 33 to auxiliary equipment such as electric components, meters, lamps, and various electric components around the driver's seat (not shown).

However, in recent years, with an increase in the number of electrical components around the driver's seat due to the added value of automobiles and the digitization of various components, the wire harness w has been enlarged, securing a wiring space, and securing the clamp 30 and the protector 31. , Fixation of wire harness w using grommet 32 and connector 33
However, there are problems such as an increase in the number of steps required for the connection and the burden on the operator.

[Problems to be solved by the invention]

The present invention has been made in view of the above points, and, in addition to eliminating the enlargement of a wire harness, a connection structure for a circuit body for an automobile, which can easily connect a wire harness and an auxiliary machine without human intervention. The purpose is to provide.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an underboard mounted on a vehicle body, a thin circuit provided on the underboard, a plurality of connectors provided on the thin circuit, and auxiliary machines mounted on the plurality of connectors. In a connection structure of an underbody circuit body for an automobile to be connected to a connector, the underboard covers a bottom portion of the vehicle body from outside, and a front bumper, a rear bumper, and a A plurality of vehicle components such as an instrument panel are provided with connectors on the accessory side for each connector of the thin circuit, and the plurality of vehicle components are assembled to the vehicle body to attach the plurality of vehicle components to the vehicle body. The connector on the accessory side is connected to the connector of the thin circuit of the underboard. Paragraph (1)).

It is also effective that a hole is provided in the bottom of the vehicle body, and the underboard covers the hole and also serves as a part of the vehicle body (claim (2)).

[Action]

In the configuration of claim (1), by providing a thin circuit on the underboard, enlargement of the wire harness is prevented. At the same time, vehicle components such as a bumper and an instrument panel are assembled to the vehicle body, and at the same time, the connectors of auxiliary devices of these vehicle components are connected to the connectors of the underboard thin circuit. Claim (2)
In the above configuration, since the underboard also serves as a part of the vehicle body, the space for disposing the underboard is not required.

〔Example〕

FIG. 1 shows a connection structure of an underbody circuit body for an automobile according to the present invention.

In the figure, 1 is a vehicle body, 2 is an instrument panel attached to the vehicle body 1 on the indoor side, 3, 4
Is a synthetic resin front and rear bumper, 5 is an underbody circuit, 6 is a frame, and the underbody circuit 5 is an underboard that can be attached between the vehicle body 1 and the frame 6. A thin circuit 8 is fixed to the underboard 7 and connectors 9a to 9i connected to the thin circuit 8 are fixed to the underboard 7.

Here, the thin circuit 8 is formed by directly forming a printed circuit on the synthetic resin underboard 7 by a transfer method, a plating method, or the like, or by forming a flexible flat circuit, a flexible printed circuit, a ribbon wire, a flat wire harness, or the like. It is made by sticking. The connectors 9a to 9i are arranged in front and rear of the underboard 7, that is, at positions facing the front and rear bumpers 3 and 4, at the lower part of the engine room 10, under the instrument panel 2, and the like.

Further, each part of the underboard 7 has a frame 6
Attachment holes 12 for a plurality of bolts 11 erected at the bottom are formed. That is, as shown in FIG. 2 showing a mounting structure of the underbody circuit body 5 (corresponding to a portion A in FIG. 1), the mounting holes 12 of the underboard 7 and the vehicle body The underbody circuit body 5 is clamped between the vehicle body 1 and the frame 6 by inserting the fixing hole 13 of the vehicle body 1 and tightening it with the nut 14. In FIG. 1, reference numeral 15 denotes a body guide protruding from both sides of the underboard 7.

The front and rear bumpers 3 and 4 are provided with the same thin circuit 16 as described above, and the connectors 17a and 17b connected to the thin circuit 16 are connected to the underbody circuit body 5.
Are provided to face the connectors 9a and 9i. At the same time as the assembly of these bumpers 3 and 4, the connector of the bumpers 3 and 4
17a, 17b and the connectors 9a, 9i of the underbody circuit body 5 are joined. In the figure, reference numeral 18 denotes a battery, which is connected in series to the connector 9b of the underbody circuit body 5.

Further, a connector 19 protrudes from a lower portion of the instrument panel 2, and as shown in FIG.
The connector 19 is inserted into the hole 21 of the vehicle body 1 by the assembly of the instrument panel 2 and joined to the connector 9d of the underbody circuit body 5. In the figure,
8 is a thin circuit, and 6 is a frame. According to the present embodiment, the vehicle components 1 such as the bumpers 3 and 4 and the instrument panel 2 are mounted on the vehicle body 1 and the connectors 17a, 17b and 19 of the vehicle components and the connectors on the underboard 7 side at the same time. 9a, 9i and 9d can be joined, and the underboard 7 made of synthetic resin has soundproofing and waterproofing effects.

FIG. 4 shows another embodiment of the connection structure of the underbody circuit body according to the present invention.

The underbody circuit body 22 includes an underboard 23 formed of the same steel plate as the vehicle body 24, a thin circuit 25 with an insulating coating attached to the underboard 23, and a connector 26a connected to the thin circuit 25. ~ 26h is fixed. A plurality of protrusions 27 are provided on the periphery of the underbody 23.
The underbody circuit body 22 is fitted into the vehicle body 24 using the projecting piece 27 as a guide, and the projecting piece 27 is connected to the vehicle body 24 by welding or the like. That is, the underboard 23 itself also serves as a body floor, and therefore, the floor panel of the vehicle body 24 is a hole 28.

〔The invention's effect〕

As described above, according to the invention described in claim (1), the vehicle components such as the bumper and the instrument panel are assembled to the vehicle body, and at the same time, the connector of the auxiliary machine of each of the vehicle components is connected to the underboard thin circuit. This eliminates the troublesome work of connecting the accessory-side connector to the wire harness of the vehicle body, and increases the efficiency of the vehicle assembly work.
By providing a thin circuit on the underboard, it is needless to say that enlargement of the wire harness is prevented. Further, according to the invention described in claim (2), the underboard also serves as a part of the vehicle body, so that the wiring space for the thin circuit is further secured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is an explanatory view of the same mounting state (part A in FIG. 1), and FIG. B in FIG.
FIG. 4 is an exploded perspective view showing another embodiment, and FIG. 5 is a perspective view showing a conventional example. 1,24 …… vehicle body, 5,22 …… underbody circuit,
6 ... Frame, 7,23 ... Underboard, 8,25 ... Thin circuit body, 9a-9h, 26a-26h ... Connector, 17a, 17b, 19
……connector.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60R 16/02 621 B60R 16/02 620

Claims (2)

(57) [Claims] An underboard is mounted on a vehicle body,
A connection structure of an underbody circuit body for an automobile in which a thin circuit is provided on the underboard, a plurality of connectors are provided on the thin circuit, and auxiliary devices are connected to the plurality of connectors by connectors. A plurality of vehicle components, such as a front bumper, a rear bumper, and an instrument panel, which cover the bottom of the body from the outside and have the auxiliary device and are assembled to the vehicle body, and the auxiliary device for each connector of the thin circuit. Side connectors are provided, and the connector on the accessory side of the plurality of vehicle components is connected to the connector of the thin circuit of the underboard by assembling the plurality of vehicle components on the vehicle body. Connection structure of an underbody circuit body for an automobile. 2. A vehicle underbody circuit according to claim 1, wherein a hole is provided in a bottom portion of the vehicle body, and the underboard covers the hole and also serves as a part of the vehicle body. Connection structure of the body.