JP2002305824A - Heat-resistant protection structure of wiring harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-resistant structure of a wiring harness cabled in the neighborhood of a heat source. SOLUTION: A hard tube or a corrugated tube is put onto a group of wires while support pins or spacers are fixed to the group of wires (wiring harness) so as to have the hard tube or the corrugated tube supported by the support pins or the spacers, and the outer circumferential surface of the tube is surrounded by a heat-resistant sheet. Since a heat-resistant air layer having a cooling effect is provided between the inner circumferential surface of the tube and the outer circumferential surface of the wiring harness, the wiring harness can be protected from heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire harness heat-resistant protection structure, and more particularly, to protecting a wire harness from a heat source in an automobile.

[0002]

2. Description of the Related Art In order to protect a wire harness routed in a vehicle from a heat source such as an exhaust pipe, it is desirable not to make a route near the wire harness. In some cases, the wiring harness must be routed near a heat source. In such a case, in order to protect the wire harness arranged near the heat source from the heat source, a heat-resistant sheet 2 as shown in FIG. The heat protection structure 1 is adopted.

When the wiring harness is routed near the heat source by adopting the above structure, the heat radiating sheet 2 directly receives the heat radiated from the heat source 5 as shown in FIG. 5 will be protected.

[0004]

Since the heat-resistant sheet receives the heat radiated from the heat source as described above, when the heat source is at a high temperature or is disposed near the heat source, the heat-resistant sheet itself is at a high temperature. It can be. In that case, the wire harness contained in the heat-resistant sheet also receives the high-temperature heat of the heat-resistant sheet.

The present invention has been made in view of the above-mentioned problems, and in a heat-resistant wire harness structure, when the heat source is at a high temperature or when the wire harness has to be routed near the heat source, the wire harness is not heat-resistant. It is an object to make the structure hard to receive.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention firstly provides a wiring harness in a region which is routed along a vehicle body panel and has a heat source near an external routing position. A heat protection structure to be provided, wherein a support pin that penetrates through the wire group and protrudes vertically and / or left and right is attached to the wire group at least in the vicinity of both ends of the region of the wire harness. The tube is covered, and the upper and lower ends of the support pin support the tube, an air layer for heat resistance is provided between the inner peripheral surface of the tube and the outer peripheral surface of the wire harness, and the outer peripheral surface of the tube is a heat-resistant sheet. And a heat-resistant protective structure for the wire harness.

[0007] With the above configuration, a hard tube or a corrugated tube to be sheathed on the wire harness and the heat-resistant sheet are supported by support pins, so that a heat-resistant air layer is provided between the inner peripheral surface of the tube and the outer peripheral surface of the wire harness. Can be provided. Thereby, the outermost heat-resistant sheet is heated, and even if the heat is transmitted to the hard tube or the corrugated tube, since the tube and the wire harness are not in direct contact, the heat is not directly transmitted to the wire harness, and Since the air layer acts to cool the heat, the heating of the wire harness can be suppressed.

The support pins are rod-shaped and penetrate through the electric wire group. It is preferable that a tape be wound around the center of the support pin and held in position. As described above, it is preferable that the tape be wound around to be thick, because the tape can be firmly fixed in the wire group. It is preferable that the support pins are arranged at two positions on both ends of the heat-resistant sheet mounting area, the directions of the support pins are phased by 90 degrees, and the hard tubes or corrugated tubes are supported at intervals of 90 degrees.

In place of the support pins, a spacer may be provided to be attached in the axial direction of the wire harness. More specifically, the present invention relates to a heat-resistant protective structure provided on a wire harness in a region where the heat source is located near an external wiring position, the second structure being provided along a vehicle body panel of an automobile, The upper and lower support portions are vertically projected from the substrate portion extending in the same direction as above, and a spacer forming a tape winding concave portion is provided on the upper and lower support portions, and the substrate portion of the spacer is connected to the wire group of the wire harness. The upper and lower support portions are arranged in the lower surface or in the wire group so as to protrude vertically from the wire group, and a tape is wound around the wire group through the tape winding recess to fix the spacer to the wire group,
A tube made of a hard tube or a corrugated tube is covered, the tube is supported at the upper and lower ends of the support section, a heat-resistant air layer is provided between the inner peripheral surface of the tube and the outer peripheral surface of the wire harness, and Is provided with a heat-resistant protection structure for a wire harness, wherein an outer peripheral surface of the wire harness is surrounded by a heat-resistant sheet.

[0010] With the above structure, the support for providing an air layer between the wire harness and the hard tube or corrugated tube is performed by inserting the spacer in the axial direction inside the wire harness. Support can be made firmly.

As described above, the board portion of the spacer may pass through the wire group, but a wire harness may be mounted on the board portion. In this case, if the substrate portion is formed into an arc shape and curved around the upper and lower support portions, the shape becomes along the outer peripheral surface of the wire harness to be placed, and the wire harness can be stably supported.

The hard tube or the corrugated tube to be placed on the support pin or the spacer is not limited to a circular shape, but may be any of an oval shape and an elliptical shape. The oval and elliptical tubes have the advantage that if the longer diameter side is attached to the heat source side, it can be separated from the heat source.

As described above, the support pins or the upper and lower support portions of the spacer have the heat source side projecting from the other side,
It is preferable to increase the cross-sectional area of the air layer on the heat source side.

The above-mentioned support pins, spacers, hard tubes and corrugated tubes are preferably formed from a heat-resistant resin nylon material.

An opening is provided between both ends of the hard tube or the corrugated tube in the longitudinal direction and the outer peripheral surface of the wire harness, and an air layer between the inner peripheral surface of the tube and the outer peripheral surface of the wire harness is open to the atmosphere. Then, convection occurs in the air layer. Support pins or spacers penetrating the inside of the wire harness are fixed to the wire harness, and tubes and heat-resistant sheets are fixed to these support pins or spacers by tape winding.
Since it is not necessary to fix both ends of the tube and the heat-resistant sheet to the wire harness, an open state can be introduced into the air layer to generate convection, thereby promoting the cooling action.

As described above, in the wire harness heat-resistant protective structure of the present invention, by providing an air layer between the wire harness and the tube, it becomes difficult to receive heat from the heat-resistant sheet, and the heat resistance of the wire harness can be increased. it can. Thus, the wire harness can be routed near the heat source, and there is no need to regulate the route of the wire harness, and the wire harness can be routed with the shortest route. Therefore, it is not necessary to lengthen the wire harness by detouring, and cost can be reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a wire harness heat-resistant protection structure according to a first embodiment of the present invention. The heat-resistant protection structure is applied to a wire harness 11 arranged above an exhaust pipe serving as a heat source shown in FIG. 11 in an automobile.

As shown in FIG. 2B, the center of the two support pins 12A and 12bB is located near both ends of the heat protection area X in the heat protection area of the wire harness 11, which is near the heat source of the wire harness 11. The support pins are fixed to the electric wire group by penetrating the electric wire group 11a of the harness 11 and wrapping the tape 13 around the electric wire group 11a on both sides of each of the support pins 12A and 12B. The support pins 12A and 12B are made of resin rods, and one support pin 12A is arranged in the vertical direction of the wire harness 11, and the other support pin 12B is arranged in the left and right direction so as to differ by 90 degrees.
Both sides of A and 12B protrude from the outer peripheral surface of the wire group 11a by a required dimension. Further, a resin tape 19 is embedded in a portion embedded in the wire group at the center in the length direction of the support pins 12A and 12B.
To increase the diameter, and to have a hook with the electric wire,
We are trying not to get out of the wire group.

After fixing the support pins 12A and 12B to the wire group 11a of the wire harness and projecting both sides thereof at intervals of 90 degrees, a slit 14a is formed in the axial direction as shown in FIG. 2 (C). The vertically divided hard tube 14 is covered, and the upper and lower ends of the support pin 12A and the left and right ends of the support pin 12B are brought into contact with the inner peripheral surface of the hard tube 14 to cover the wire harness 11 with the air layer 18 formed. .
In this state, the tape 15 is wound around both ends in the length direction. Further, on the outer peripheral surface of the hard tube 14, FIG.
As shown in FIG. 1D, heat-resistant sheet 16 is wound around
As shown in the figure, the tape 17 is wound around both ends and fixed.

As described above, when the wire harness 11 is covered with the hard tube 14 and the heat-resistant sheet 16 in a state where the air layer 18 is opened, both ends of the hard tube 14 in the longitudinal direction are in contact with the outer peripheral surface of the wire group 11a of the wire harness. Opening 14 between
a is formed, and the opening 14a becomes an outside air opening port communicating with the internal air layer 18.

The support pin and the tape 1 for fixing the support pin
3, hard tube 14, hard tube fixing tape 1
5, the heat-resistant sheet 16, and the tape 17 for fixing the heat-resistant sheet are all made of heat-resistant resin.

As described above, the air layer 1 for heat resistance is provided between the inner peripheral surface of the hard tube 14 and the outer peripheral surface of the wire harness 11.
1, the air layer 18 surrounds the entire outer periphery of the wire harness 11 at the center position as shown in FIG. The air layer 18 has openings 16 at both ends in the longitudinal direction.
It is open to the outside air through a.

With the above heat-resistant structure, heat radiated from a heat source such as an exhaust pipe is first absorbed by the outermost heat-resistant sheet 16. Hard tube 14 in contact with heat-resistant sheet 16
, Heat is transmitted to the air layer 18. The air layer 18 is convectively cooled because it communicates with outside air at both ends in the length direction. By providing the air layer 18 in this manner, the wire harness 11 is less likely to receive heat from the heat-resistant sheet 16 heated by the heat source, and can be prevented from being heated.

FIG. 3 shows a first modification of the first embodiment, in which a corrugated tube 30 is used as a substitute for the hard tube 14, and 16 is wound around the outer peripheral surface of the corrugated tube 30 even when heat-resistant. The other components are the same, and thus are denoted by the same reference numerals.

With the above configuration, as shown in FIG. 3B, the concave portion 3 of the corrugated tube 30 is provided between the corrugated tube 30 and the heat-resistant sheet 16 where the concave and convex portions are continuous.
An air layer 18 ′ can also be provided between Oa and the heat-resistant sheet 16. Therefore, the heat transmitted from the heat-resistant sheet 16 to the corrugated tube 30 can be reduced.

FIG. 4 shows a second modification of the first embodiment.
Instead of a circular hard tube, an elliptical hard tube 1
4 'is used. Correspondingly, the support pins 12A 'attached vertically are long and the support pins 12B' attached horizontally are short. Further, in the vertical support pins 12A ', the amount of protrusion of the lower portion on the heat source 5 side is large and the amount of protrusion on the opposite side is small. This allows
The air layer 18 formed between the hard tube 14 'supported by the support pins 12A' and 12B 'and the wire harness 11 can have a large cross-sectional area on the heat source side and a small cross-sectional area on the opposite side. ing. The other components are the same, and thus are denoted by the same reference numerals.

With the above configuration, the wire harness 11 can be kept away from the heat source 5 and the air layer 18 on the heat source 5 side has a large area. 11 can have a structure that is not easily heated.

FIGS. 5 and 7 show a wire harness heat-resistant protective structure 20 according to a second embodiment. In the second embodiment,
The spacer 22 is used instead of the support pin. The spacer 22 is a molded product molded from a heat-resistant resin, and as shown in FIG. 6, a substrate portion 22a extending in the same direction as the axial direction of the wire harness 11, and an upper support portion extending vertically from the center of the substrate portion 22a. 22b and the lower support portion 22c are projected. These upper and lower support portions are connected to the upper support portion 22b by the lower support portion 2.
The protrusion amount is larger than 2c. Also,

The substrate portion 22a includes upper and lower support portions 22b,
A portion 22 that projects left and right from a central position where 22c projects.
a-1 and 22a-2 are curved in an arc shape so as to follow the outer peripheral surface of the wire harness 11. Further, a tape winding recess 22d is provided at the center in the longitudinal direction of the left and right protruding portions 22a-1 and 22a-2 of the upper support portion 22b and the substrate portion 22a. Further, the upper support portion 22b
The tape winding piece 22e is provided by projecting both ends in the length direction from the substrate portion 22a.

FIG. 7 shows an assembling procedure of the second embodiment. As shown in FIG. 7B, a wire harness 21 is placed on a substrate portion 22a of a spacer 22, and 22b is passed through the wire group 11b and protruded upward. Next, the tape 23 is wound through the tape winding recess 22d and the tape winding piece 22e, and the wire group 11 is wound.
The spacer 22 is fixed to a. In this state, the wire group 11
a, upper and lower support portions 22b and 22c protrude in the vertical direction from
The right and left protruding portions 22a of the substrate portion 22 extend in the right and left directions orthogonal to each other.
1, 22a-2 protrude.

In this state, the vertically split corrugated tube 30 is put on as shown in FIG. 7C, and the inner peripheral surfaces thereof are vertically supported by the spacers 22b and 22c, the left and right protruding portions 22a-1 of the substrate 22, and The air layer 18 is formed by being supported at the tip of the tip 22a-2 and fixed with the tape 24. Further, the heat-resistant sheet 16 is wound around the outer peripheral surface of the corrugated tube 30 and fixed with the tape 27. Both ends in the longitudinal direction of the corrugated tube 30 are opened to the outside air as in the first embodiment, and the air layer 18 communicates with the outside air. Further, the cross-sectional area of the air layer 18 on the upper support portion 22b side is large.

The wire harness 11 having the heat-resistant structure having the above-described structure is arranged on an automobile with the side having a large cross-sectional area of the air layer 18 disposed on the heat source side. The heat resistance is the same as that of the first embodiment, and the description is omitted.

FIGS. 8A and 8B show a modification of the second embodiment. In the modification, the substrate portion 22a 'of the spacer 22'
Are arranged in the wire group 11a of the wire harness, and the left and right sides of the board portion 22a 'are horizontal without being curved. The horizontal left and right protruding portions and the upper and lower support portions have the same dimensions, and a tape winding concave portion 22g 'is formed at the center in the length direction. When the spacer 22 'described above is used, the outer periphery of the wire harness 11 and the hard tube 1
4 has the same cross-sectional area over the entire circumference.

[0034]

As is clear from the above description, according to the present invention, the support pin or the spencer is used, and the air layer is provided between the hard tube and the corrugated tube to be covered. Even if the heat-resistant sheet is heated, the heat is not directly transmitted to the wire harness, and the heat is cooled in the air layer, so that the heating of the wire harness can be suppressed or prevented.

Further, since the air layer is configured to conduct with outside air at both ends in the longitudinal direction, convection occurs in the air layer, so that heat transmitted from a heat source can be cooled, and heating of the wire harness can be effectively performed. Can be prevented.

Therefore, by adopting the wire harness heat-resistant protection structure of the present invention, the wire harness can be protected from the heat source, and the shortest path can be provided by arranging the wire harness near the heat source.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a perspective view, and FIG. 1B is a cross-sectional view taken along line AA of FIG.

FIGS. 2A to 2D are views showing an assembly procedure of the first embodiment.

FIG. 3 shows a first modified example of the first embodiment, and FIG. 3 (A) is a perspective view showing a state in which a corrugated tube is provided,
(B) is a principal part enlarged sectional view.

FIG. 4 is a sectional view showing a second modified example of the first embodiment.

5A and 5B show a second embodiment of the present invention, in which FIG. 5A is a perspective view, and FIG. 5B is a sectional view taken along line BB of FIG. 5A.

FIG. 6 shows a spacer used in the second embodiment,
(A) is a perspective view, (B) is a BB sectional view of (A).

FIGS. 7A to 7C are diagrams showing an assembling procedure according to a second embodiment.

FIG. 8A shows a modified example of the spacer, and FIG. 8B is a cross-sectional view of the assembled state.

FIG. 9 shows a conventional example, in which (A) is a perspective view of a final step,
(B) is a perspective view of the assembled state, (C) is C- of (B).
It is a C line sectional view.

FIG. 10 shows a conventional example when a heat source is nearby,
(A) is a perspective view, (B) is a BB sectional view of (A).

[Explanation of symbols]

 Reference Signs List 5 Heat source 10 Wire harness heat-resistant protective structure 11 Wire harness 11a Wire group 12 Support pin 14 Hard tube 16 Heat-resistant sheet 18 Air layer 22 Spacer 22a Substrate part 22b Upper support part 22c Lower support part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E322 AA07 BA05 CA05 EA01 EA07 FA02 5G357 DA03 DB03 DC12 DD01 DD05 DD10 DE08 5G363 AA05 BA02 DC02

Claims (4)

[Claims] 1. The vehicle is routed along a vehicle body panel,
A heat protection structure provided on a wire harness in a region where a heat source is located in the vicinity of an outer wiring position, wherein at least near both ends of the region of the wire harness, support pins projecting up and down and / or left and right through a group of electric wires. With the tube attached to the wire group, cover the tube consisting of a hard tube or a corrugated tube, support the tube at the upper and lower ends of the support pin, and provide heat resistance between the tube inner peripheral surface and the wire harness outer peripheral surface. A heat-resistant protective structure for a wire harness, wherein an air layer is provided and an outer peripheral surface of the tube is surrounded by a heat-resistant sheet. 2. Routed along the body panel of the car,
A heat-resistant protective structure provided on the wire harness in a region where a heat source is located in the vicinity of the outer wiring position, wherein the upper and lower support portions protrude vertically from a board portion extending in the same direction as the axial direction of the wire harness, A spacer forming a tape winding concave portion is provided in the upper and lower support portions, and the substrate portion of the spacer is arranged on the lower surface of the wire group of the wire harness or in the wire group, and the upper and lower support portions project vertically from the wire group. At the same time, a tape is wound around the wire group through the tape winding recess to fix the spacer to the wire group, a tube made of a hard tube or a corrugated tube is covered, and the tube is supported at both upper and lower ends of the support portion. An air layer for heat resistance is provided between the peripheral surface and the outer peripheral surface of the wire harness, and the outer peripheral surface of the tube is surrounded by a heat-resistant sheet. Heat protection structure of a wire harness, characterized in that. 3. The wire harness according to claim 1, wherein the upper and lower support portions of the support pins or the spacers have the heat source side protruding from the other side, and the cross-sectional area of the air layer on the heat source side is large. Heat-resistant protective structure. 4. An opening is provided between both ends of the hard tube or the corrugated tube in the longitudinal direction and the outer peripheral surface of the wire harness, and an air layer between the inner peripheral surface of the tube and the outer peripheral surface of the wire harness is open to the atmosphere. The heat-resistant protection structure for a wire harness according to any one of claims 1 to 3, wherein a convection is generated in the air layer.