JP3324549B2 - Wiring harness mounting 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 wire harness mounting structure, and more particularly to a wire harness mounted on a vehicle body frame which is prevented from coming off at a bent portion due to stress generated in a corrugated tube.

[0002]

2. Description of the Related Art Generally, a wire harness routed in an engine room of an automobile is provided with a corrugated tube for protecting a bundle of electric wires from heat, dust and the like. And
Attachment of the wire harness to the vehicle body frame is performed by mounting a clamp on the outer periphery of the corrugated tube at required intervals and fitting the locking claws of the clamp into mounting holes formed at required positions on the vehicle body frame. I am trying to fix it.

[0003]

More specifically, as shown in a plan view in FIG. 3, a wire harness W / H for an engine room main harness routed to a radiator support 1 is shown.
The protector 2 is externally mounted along the base frame 1a extending left and right, and is further extended rearward from the left and right ends of the protector 2. The extended wire harness W / H is covered with a large-diameter (approximately φ25 mm) corrugated tube 3 and routed along the side frame 1b, and is placed on the back side of the side frame 1b for introduction into the tire house. It is made to go around. Here, the side frame 1b of the radiator support 1 is not horizontal but has a concave shape like a valley. For this reason,
As shown in FIG. 4, the wire harness W / H is also bent three-dimensionally along the shape of the side frame 1b,
Is fixed to the mounting hole 6 by the clamp 5 attached to the corrugated tube 3 at the top.

[0004] However, since the large-diameter corrugated tube 3 is forcibly bent at a steep angle at the bent portion 4, wrinkles are partially generated, and the repulsive force for returning the portion to a linear state is bent. It acts strongly on the top of the part 4. This repulsive force is generated by the vibration during the running of the vehicle.
When a twist occurs in a part of the material, it becomes stress and is further enhanced. For this reason, the side frame 1
b, a tension in the pull-out direction acts on the clamp 5 fixed to the wire harness W /
H could come off the radiator support 1.

[0005] The present invention has been made in view of the above-described problems, and by dividing a bent portion which is bent at a steep angle and clamped, the stress acting on the bent portion is removed, and the bending at the bent portion is reduced. It is an object to prevent disconnection of a wire harness.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a wire harness sheathed with a corrugated tube is routed along a vehicle body frame in a routing route, and A mounting structure for mounting a wire harness to a vehicle body frame by fitting a clamp mounted on a tube into a mounting hole formed in the vehicle body frame, wherein the corrugated tube is bent at a steep angle in a folded shape. And having a fixed point to the body frame by a clamp at the vertex of the bent portion, in the vicinity of the bent portion, and
There is provided a wire harness mounting structure characterized in that a tension absorbing portion is provided at a portion where there is no external interference member so as to provide a gap by dividing the corrugated tube in the axial direction.

Specifically, the division width of the corrugated tube in the tension absorbing section is about 20 to 45 mm, and each divided end of the divided corrugated tube has a tape width of about 20 mm to close the slit of the corrugated tube. 20
mm tape. At this time, the tape is wound in a half-wrap shape so as to extend from the end of the corrugated tube, and the gap between the extended tapes is adjusted to be about 3 mm. This is because when the tapes overlap each other, the tension absorbing action is reduced,
This is because if the gap is too large, dust or the like may enter the corrugated tube.

[0008] According to the above configuration, the tension absorbing portion divided from the corrugated tube can cut off stress such as wrinkles and twists acting on the bent portion. Therefore, the tension in the pull-out direction acting on the clamp attached to the bent portion to fix the wire harness to the vehicle body frame is reduced,
The clamp can be prevented from coming off.

The vehicle body frame is a radiator support in an engine room, and the tension absorbing portions are provided near the bent portion of a wire harness which is attached by a clamp at the lowest position on both sides of the radiator support. 2). As a result, the wire harness that comes down from the base frame of the radiator support, clamps at the lowest vertex, and is routed so as to rise to the tire house side, securely clamps the wire harness where strong tension in the pull-out direction acts. Can be fixed and stopped.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a wire harness mounting structure. FIG. 1 is a plan view showing a state where a wire harness W / H as an engine main harness is routed and mounted on a radiator support 11 as a vehicle body frame. Is shown. The lower side in the figure is the front side, and the radiator support 11 has a base frame 11a located directly below the radiator, and side frames 11b extending from both sides of the base frame 11a to the rear suspension holding portion 11c side.

Since the wiring harness W / H is routed in the engine room, it is exposed to heat and an external environment, and is protected by the protector 12 and the corrugated tube 13. The corrugated tube 13 used here is
It has a relatively large diameter of about φ25 mm. The wire harness W / H is routed along the vehicle body frame, and the portion protected by the protector 12 is fixed by the clamp 15 at several places along the base frame 11a. On the other hand, the portion extended from both sides of the protector 12 and protected by the corrugated tube 13 is the side frame 1
1b, respectively, and similarly clamp 15
a, 15b are fixed.

As shown in FIG. 2, the side frame 11b is configured to descend deeply from the base frame 11a at a steep angle, and then rise again toward the suspension holding portion 11c. Therefore, the wire harness W
/ H is bent three-dimensionally along the shape of the side frame 11b, and the locking piece 15a of the clamp 15a attached to the outer periphery of the corrugated tube 13 is set with the lowermost vertex as a fixing point. 'Is fitted into the mounting hole 16 to fix the wire harness W / H.
For this reason, the corrugated tube 13 has a bent portion 14 that is bent at a sharp angle.

A tension absorbing portion 17 is provided near the bent portion 14 and at a portion where no external interference member exists. The tension absorbing portion 17 is for preventing a repulsive force due to an excessive bending in the bending portion 14 from acting on the clamp 15a, and is formed by dividing the corrugated tube 13 in the axial direction to give a required interval X. You.

Specifically, the interval X of the division width between the ends 13a and 13b of the corrugated tube 13 divided by the tension absorbing portion 17 is about 20 to 45 mm (23 mm in FIG. 2).
And Since the corrugated tube 13 has a slit in the axial direction, tapes 18a and 18b each having a width of about 20 mm are wound around each end 13a and 13b in a half-wrap shape in order to prevent opening. Part 1
Extension width L of half of the tape width from 3a, 13b L = 10 mm
The gap Xa between the tapes 18a and 18b is set to about 3 mm. It is the tape 1 that gives the gap Xa.
This is to prevent the tension absorbing action from being reduced due to the overlapping of 8a and 18b. In this manner, the suspension holding portion 11
The wire harness W / H rising to the side c is turned to the back side, fixed from the back side by the clamp 15b, and further introduced to the tire house side.

In the wire harness mounting structure having the above structure, the tension absorbing portion 17 is provided in the vicinity of the bent portion 14 where the large diameter corrugated tube 13 is forcibly bent at a steep angle. The stress acting on the corrugated tube 13 is removed. That is, since the corrugated tube 13 is divided by the tension absorbing portion 17, the twist of the corrugated tube 13 caused by vibration or the like during running of the vehicle does not concentrate on the bent portion 14 as the mounting portion. Further, the repulsive force for returning to the linear state by bending at a steep angle is dispersed and reduced by the division of the corrugated tube 13. Therefore, the bent portion 14
As a result, the wire harness W / H can be stably fixed and held without exerting an excessive tension on the clamp 15a for fixing the wire harness W / H to the vehicle body frame. Further, since the tension absorbing portion 17 is set at a position where there is no external interference member, even if there is a slight interval X generated by dividing the corrugated tube 13, the protection function of the wire harness W / H may be reduced. Absent.

[0016]

As is clear from the above description, in the wiring harness mounting structure according to the present invention, the corrugated tube is bent at a steep angle when the wiring harness is routed along the shape of the vehicle body frame. The stress in the portion can be absorbed by the tension absorbing portion. Therefore, disconnection of the wire harness accompanying release of the clamp at the bent portion of the corrugated tube can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a wire harness mounting structure according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 W / H Wire harness 11 Radiator support 13 Corrugated tube 14 Bent part 15, 15a, 15b Clamp 16 Mounting hole 17 Tension absorbing part Xa Gap

Claims (2)

(57) [Claims] 1. A wiring harness covered with a corrugated tube is routed on a routing route along a vehicle body frame,
A mounting structure for mounting a wire harness to a vehicle body frame by fitting a clamp mounted on the corrugated tube into a mounting hole formed in the vehicle body frame,
The corrugated tube has a bent portion bent in a folded shape at a steep angle, and a fixing point to the vehicle body frame by a clamp is set at a vertex of the bent portion, in the vicinity of the bent portion, and A mounting structure for a wire harness, wherein a tension absorbing portion is provided at an area where there is no external interference member so as to provide a gap by dividing the corrugated tube in the axial direction. 2. The vehicle body frame is a radiator support in an engine room, and the tension absorbing portion is provided near a bent portion of a wire harness attached by a clamp at a lowest position on both sides of the radiator support. 2. The mounting structure of the wire harness according to 1.