JP2018019503A - Bending restricting member of wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending restricting member capable of bending a corrugated tube externally mounted on a wire harness only in one direction.SOLUTION: A plurality of arc frame portions for bending restraint to be inserted into at least a half circumferential portion of a valley portion of a corrugated tube having a circular cross-section exterior to a wire harness are provided at intervals in the length direction. A pair of connecting rod portions continuous with the diametrically opposed outer surface positions on both circumferential sides of the plurality of arc frame portions and extending in the length direction is provided. The plurality of arc frame portions and the pair of connecting rod portions are integrally molded to form a resin molded article.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wire harness bending restricting member, and more particularly, to allow a required region of a wire harness routed in a vehicle such as an automobile to bend in one direction and to restrict bending in the other direction. .

  Conventionally, wire harnesses that are routed between movable bodies such as slide seats, slide doors, and trunk lids and fixed bodies such as vehicle body panels are wired in a predetermined direction when the movable body moves. It is necessary to bend and follow, and to prevent interference with the peripheral portion due to unexpected bending.

  When it is necessary to cause the wire harness to follow the movement of the movable body, the wire harness group is passed through a corrugated tube in which annular crests and troughs are alternately provided in the axial direction, and the bending needs to be restricted. In addition, a technique for externally fitting a bending restricting member that fills the valley portion of the corrugated tube has been conventionally provided.

  For example, the present applicant provides a bending regulating member 100 shown in FIG. 9 in Japanese Patent Laid-Open No. 2014-220986 (Patent Document 1). The bending restricting member 100 is made of an elastic member and is used by being inserted into a slit 120 continuous in the length direction of the corrugated tube 110 to prevent the line along the slit 120 from being bent. The bending restricting member 100 includes an inner peripheral side positioning portion 102 at the inner end of the shaft portion 101 extending in the radial direction, and an outer peripheral side positioning portion 103 at the middle in the radial direction. The bending regulating member 100 is inserted into the slit of the corrugated tube 110, and the corrugated tube 110 is sandwiched between the inner and outer peripheral positioning portions 102 and 103, so that the line along the slit 120 cannot be bent, or FIG. As shown in (C), by inserting a bending slit 105 in the outward projecting portion of the shaft portion 101, the line along the slit 120 can be bent greatly.

  Moreover, the bending control member 200 shown to FIG. 10 (A) (B) is provided by Unexamined-Japanese-Patent No. 2016-25675 (patent document 2). The bending restricting member 200 is connected to one end in the circumferential direction of the path restricting portion 201 to be inserted into the trough portion of the corrugated tube so that it can be bent at the connecting portion 202, and has a length at one end on the side connected by the connecting portion 202. Attachment portions 203 that are curved in a C shape are provided at both ends in the direction, and the attachment portions 203 are attached to the outer periphery of the corrugated tube 110 by external fitting.

JP 2014-220986 A JP 2016-25675 A

As shown in FIG. 9, the bending restricting member 100 provided in Patent Document 1 can suppress or prevent the bending along the inner periphery of the line along the slit, but is 90 degrees perpendicular to the line along the slit. Directional bending cannot be suppressed or regulated.
Further, the bending restricting member 200 shown in FIG. 10 provided in Patent Document 2 can also suppress bending at the portion where the path restricting portion 201 is inserted into the valley portion of the corrugated tube, but the route restricting portion 201 is not inserted. Bending at the part cannot be suppressed. Therefore, if the circumferential length of the path restricting portion 201 is short and 90 degrees or less, the bending in the orthogonal direction cannot be suppressed and restricted as in Patent Document 1. As described above, the conventional bending restriction member can be restricted in the portion where the restriction member is inserted in the valley portion of the corrugated tube, but cannot be restricted in the orthogonal direction and cannot be restricted in the vicinity. Interference with external materials cannot be reliably prevented.

  The present invention has been made in view of the above problems, and by attaching a bending restricting member, it is possible to bend only in one direction and to restrict bending in the other three directions, thereby interfering with the outer member. It is an issue to ensure that this can be prevented.

In order to solve the above-mentioned problems, the present invention includes a plurality of bending-regulated arc frame portions that are inserted into at least a half-circumferential portion of a trough portion of a circular cross-sectional corrugated tube that is externally mounted on a wire harness with a space in the length direction. , Including a pair of connecting rods extending in the length direction and continuous to the outer surface positions facing the diametrical direction on both sides in the circumferential direction of the plurality of arc frame portions,
A bending restricting member for a resin wire harness, in which the plurality of arc frame portions and the pair of connecting rod portions are integrally formed, is provided.

The arc frame portion is an arc frame of 180 degrees or more, and in the range of 180 degrees, the valley portion of the corrugated tube is filled without a gap, and the portion exceeding 180 degrees is gradually narrowed toward the tip. And the pitch of the arc frame portions arranged in parallel in the length direction is equal to or 2 to 3 times the pitch of the valley portions of the corrugated tube,
A pair of the connecting rod portions provided to face the diameter position opened by 180 degrees are connected to the outer surface of the peak portion of the corrugated tube so as to be continuous with the outer surface of the arc frame portion.
When the arc frame portion is 180 degrees, the connecting rod portion is provided at a position facing the diameter direction at both ends in the circumferential direction of the arc frame portion.

In order to fill each arc frame portion into the valley portion of the corrugated tube without gaps, the arc frame portion filling the trapezoidal valley portion has a trapezoidal cross section.
In addition, in the arc frame part exceeding 180 degrees, the bottom dimension of the trapezoid on both sides in the circumferential direction is gradually reduced to provide a gap between both side surfaces of the valley part.

  The bending restricting member of the present invention is made of a relatively rigid resin such as polypropylene or polyamide. In addition, a bending restricting member integrally including the arc frame portion and the connecting rod portion is formed as a continuous material, and is used by cutting to a required length according to the region to be bent.

  As described above, the bending restricting member of the wire harness of the present invention can perform bending restriction in three directions, that is, a portion in which the arc frame portion is inserted into the trough portion of the corrugated tube and both side portions of the inserting portion. It is possible to perform only one-way bending with the portion into which the frame portion is not inserted as the inner circumferential direction. Thus, in the region where the bending restricting member of the present invention is attached to the corrugated tube, it can be bent only in one direction with a circular cross section, cannot be bent in the other three directions, and only bent in the required direction of the wire harness. Thus, it is possible to reliably prevent interference with surrounding outer members.

  When the arc frame portion of the bending restricting member extends beyond 180 degrees connected by the connecting rod portion, the interval between the both ends in the circumferential direction of the arc frame portion is widened between the both ends and is externally attached to the wire harness. The dimensions are such that the corrugated tube can be inserted. In addition, the width of each arc frame portion in the circumferential direction exceeding 180 degrees is gradually narrowed toward the tip, so that the wire harness can be smoothly bent only in one direction.

  As described above, the bending restricting member attached to the corrugated tube to be mounted on the wire harness of the present invention is connected by the pair of connecting rods at a position 180 degrees apart from the arc frame portion arranged at a required interval in the length direction. Because it has a simple shape and is an integral resin molded product, it can be manufactured at low cost, and simply by attaching the bending restricting member to the outer periphery in the bending direction of the corrugated tube Bending can be controlled. In addition, bending in this one direction can be performed, and bending in the other direction can be suppressed and prevented. Therefore, the wire harness bent and routed in one direction can be regulated, and the wire harness can be reliably prevented from bending to the other and interfering with the peripheral members.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of the present invention, (A) is a schematic diagram showing a wiring harness wiring location, (B) is a drawing showing a bent portion of the wire harness, and (C) is a corrugated tube sheathed on the wire harness. It is a perspective view which shows the state which has attached the bending control member. The bending control member is shown, (A) is a perspective view, (B) is a front view, (C) is a side view, (D) is a plan view, and (E) is a sectional view taken along line EE of (D). . It is a schematic sectional drawing for demonstrating the bending direction of the state which coat | covered the wire harness with the corrugated tube and attached the bending control member to this corrugated tube. It shows that it cannot bend in the bending direction X1, (A) is a sectional view of the upper half circumference, (B) is a sectional view of the lower half circumference, and (C) is an overall sectional view. It shows that it can be bent in the bending direction X2, (A) is a sectional view of the upper half circumference, (B) is a sectional view of the lower half circumference, and (C) is an overall sectional view. It shows that bending cannot be performed in the bending directions X3 and X4, (A) is a side view of the left half circumference, and (B) is a cross-sectional view perpendicular to the length direction. A 2nd embodiment of a bending control member is shown, (A) is a perspective view, (B) is a front view, (C) is a side view, (D) is a top view. It is a perspective view which shows the state attached to the corrugate tube which carried out the bending | limiting control member of 2nd Embodiment on the wire harness. (A) (B) (C) is a perspective view which shows a prior art example. (A) and (B) are perspective views showing other conventional examples.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1st Embodiment is shown in FIG. 1 thru | or FIG.
As shown in FIG. 1, the wire harness bending restricting member 1 is partially provided on a corrugated tube 10 that is externally mounted on an electric wire group of a wire harness 30 that is branched from a floor harness 33 arranged in an automobile and feeds a slide sheet 50. It is attached. The wire harness 30 is bent to follow the forward / backward movement of the slide sheet 50, and the bending restricting member 1 is attached to the outer surface of the corrugated tube 10 in the bending region 30X.

  The corrugated tube 10 for attaching the bending regulating member 1 to the outer surface is a general-purpose product made of extruded resin and having a circular cross section, and annular trough portions (concave portions) 11 and crest portions (convex portions) 12 are alternately arranged in the length direction. In preparation, it can be bent all around. The corrugated tube 10 is often provided with a slit for inserting a wire harness over the entire length in the length direction. The corrugated tube 10 to which the bending restriction member 1 of the present invention is attached is not specified with or without a slit, and the attachment position of the slit and the bending restriction member 1 is not specified.

  The bending restricting member 1 is made of a relatively rigid resin such as polypropylene or polyamide, and has a plurality of arc frame portions 2 arranged side by side at intervals in the length direction, and both ends of the arc frame portions 2 in the circumferential direction. A pair of connecting rod portions 3 (3A, 3B) are provided by integral molding in the diameter direction which is 180 degrees apart.

  The arc frame portion 2 has a half-circular frame shape of 180 degrees and is fitted to the half-circumferential portion of the valley portion 11 of the corrugated tube 10 to be mounted. Since the cross-sectional shape of the trough portion 11 to which the arc frame portion 2 is fitted is trapezoidal as shown in FIG. 2 (E), the cross-sectional shape of the arc frame portion 2 is also trapezoidal, and the trough portion 11 has almost no gap. The outer surface 2a of the arc frame portion 2 forms a flat surface with the outer surface of the mountain portion 12 so as to be filled.

  The connecting rod portion 3 protrudes from the outer surfaces at both ends in the circumferential direction of the arc frame portion 2 and extends linearly in the length direction with the arc frame portions 2 arranged at a predetermined pitch in the length direction being continuous. It has a round bar shape. The parallel pitch of the arc frame portions 2 connected by the pair of connecting rod portions 3 (3A, 3B) provided to face each other in the diameter direction is equal to the pitch of the valley portions 11 of the corrugated tube 10. Accordingly, the corrugated tube 10 in the region where the bending restricting member 1 is mounted is loaded with the arc frame portion 2 on the half circumference portion of each valley portion 11.

  The connecting rod portion 3 extending in the length direction can be bent in the length direction, but the direction in which the pair of connecting rod portions 3A and 3B face each other, that is, the direction orthogonal to the length direction of the connecting rod portion. In other words, in the bending direction in which one side is the outer peripheral side and the other is the inner peripheral side, the connecting rod portion 3 has no expansion / contraction function and cannot be bent. In addition, the connection rod part 3 is not limited to a round bar shape, and may be a continuous protrusion rib.

  The bending restricting member 1 is a bent region 30X of the corrugated tube 10 through which the electric wire group of the wire harness 30 is inserted, and is attached to a half-circumferential outer surface that is the outer peripheral side in the bending direction. In this mounted state, both ends in the length direction of the bending regulating member 1 are wound and fixed to the outer peripheral surface of the corrugated tube 10 with adhesive tapes 25A and 25B.

  In this mounted state, as shown in FIG. 4 (A), the arc frame portion 2 is loaded in the upper half circumference 10a of the valley portion 11 of the corrugated tube 10 in the figure without any gap. In the upper half circumference 10a of the corrugated tube 10 to which the bending restricting member 1 is mounted, the close movement of both side walls of the valley portion 11 is prevented by the arc frame portion 2, so that the corrugated tube 10 has an arrow whose upper vertex P1 is the inner circumference. Bending in the bending direction of X1 is prevented.

  As shown in FIG. 4B, the arcuate frame portion 2 is not loaded in the valley portion 11 on the lower half circumference 10 b diametrically opposed to the upper half circumference 10 a of the corrugated tube 10. Although the wall can move in both the proximity and separation directions, the upper half circumference 10a does not bend. Therefore, as shown in FIG. 4C, the bending of the arrow X1 in which the upper half circumference on the loading side of the bending restricting member 1 is the inner circumference side. Is blocked.

  On the other hand, as shown in FIG. 5, the lower half circumference 10 b becomes the inner circumference side and can be bent to an arrow X <b> 2 with the lower vertex P <b> 2 as a fulcrum. At that time, as shown in FIG. 5A, when the upper half circumference 10a is the outer circumference side, the valley portion 11 bends in the spreading direction, and the arc frame portion 2 to be loaded in the valley portion 11 and the both side walls of the valley portion 11 Since there is a gap in between, it can bend in that direction. The lower half circumference 10b can be bent to the inner circumference side as shown in FIG. 5B because the arc frame portion 2 of the bending restricting member 1 is not loaded in the trough portion 11. Accordingly, as shown in FIG. 5C, the lower half circumference 10b indicated by the arrow X2 can be bent in the direction of the inner circumference and the upper half circumference 10a becomes the outer circumference.

  As shown in FIG. 6, the connecting rod portions 3A and 3B extending in a straight line of the bending restricting member 1 are arranged in contact with the outer surfaces of the left and right half circumferences 10c and 10d in the width direction of the corrugated tube 10, and on the upper side The arc frame 2 is loaded in the valley 11. Therefore, in the direction orthogonal to the length direction shown in FIG. 6B, the left half circumference 10c cannot be bent in the direction indicated by the arrow X3 with the outer circumference being the outer circumference and the right half circumference 10d being the inner circumference. Similarly, the left half circumference 10c cannot be bent in the direction indicated by the arrow X4, which is the inner circumference and the right half circumference 10d is the outer circumference. On the other hand, in the bending in the length direction shown in FIG. 6C, the pair of connecting rod portions 3A and 3B in the direction perpendicular to the length direction bend in parallel, so that the bending in the length direction is possible. As shown in B), it can be bent and followed in one direction according to the movement of the slide sheet.

  As described above, the corrugated tube 10 to which the bending restricting member 1 is attached is restricted to bend in the inner peripheral direction with the center of the half circumference on the attachment side as the apex P1 and bend around the apexes P3 and P4 on the left and right half circumferences. The On the other hand, the lower half circumference 10b not equipped with the bending restricting member 1 becomes the inner circumference side with the apex P2 as the center, and only bending in the direction having the upper half circumference 10a as the outer circumference is possible. Therefore, the bending restricting member 1 can be bent only in this direction by being attached to the upper half circumference 10a which is the outer peripheral side in the bending direction.

  Since the bending restricting member is a resin molded product, it can be manufactured at low cost. In addition, it is possible to restrict the bending so that it can be bent in only one direction by attaching it to the outer circumference in the bending direction and winding and fixing the adhesive tape, thereby preventing bending in the remaining three directions. Further, the corrugated tube can be attached even when there is no slit.

7 and 8 show a second embodiment of the bending restricting member.
The bending restricting member 1-2 is formed of a resin molded product integrally including an arc frame portion 2-2 and a pair of left and right connecting rod portions 3 (3A, 3B).

  The arc frame portion 2-2 is an arc frame of 180 degrees or more, and in this embodiment, the arc frame portion 2-2 is about 300 degrees, and a corrugated tube insertion space S is provided between the tips 2P1 and 2P2 on both sides of the arc frame portion 2-2. Each arc frame portion 2-2 fills the valley portion 11 of the corrugated tube 10 with no gap in the range 2f of 90 degrees sandwiching the apex P1 in the circumferential direction, that is, the range 2f of 180 degrees in the upper half circumference, as in the first embodiment. The shape is made. In addition, connecting rod portions 3 (3A, 3B) are provided on the outer surfaces of the left and right vertices P3 and P4, and the arc frame portions 2-2 that are arranged in parallel along the length direction with a required pitch are connected.

  The side portions 2g and 2g of the arcuate frame portion 2-2 exceeding 180 degrees and reaching the tips 2P1 and 2P2 are gradually narrowed toward the tips 2P1 and 2P2. Thus, when the lower half circumference 10b bends in the direction that becomes the inner circumference, the bend is made without difficulty.

  In the bending restricting member 1-2, the arc frame portion 2-2 is about 300 degrees, the valley portion 11 of the corrugated tube 10 is filled, and the corrugated tube 10 is sandwiched between the pair of connecting rod portions 3, When attached to the corrugated tube 10, it is not easily detached, and it is possible to omit winding and fixing with an adhesive tape.

  The effect of the bending restricting member 1-2 of the second embodiment is the same as that of the bending restricting member of the first embodiment, and the unidirectional bending with the portion where the bending restricting member 1-2 is not mounted as the inner periphery. Only the bending with the opposite side as the inner circumference and the bending in the orthogonal direction is restricted.

  The bending restricting member of the present invention can be formed as a continuous material by continuous extrusion molding, and the continuous material can be cut and used according to the length of the region where bending restriction is required. In this case, the manufacturing cost of the bending restricting member can be further reduced.

DESCRIPTION OF SYMBOLS 1, 1-2 Bending control member 2, 2-2 Arc frame part 3 Connecting rod part 10 Corrugated tube 11 Valley part 12 Mountain part 30 Wire harness

Claims (2)

Provided with a plurality of bending-defining arc frame portions that are inserted into at least a half circumference portion of a trough portion of a corrugated tube having a circular cross section that is externally mounted on the wire harness, and spaced in the length direction, and the circumferential direction of these arc frame portions A pair of connecting rod portions that extend in the length direction and are continuous to the outer surface positions opposite to each other in the diameter direction;
A bending restricting member for a resin wire harness in which the plurality of arc frame portions and the pair of connecting rod portions are integrally formed. The arc frame portion is an arc frame of 180 degrees or more, and in the range of 180 degrees, the valley portion of the corrugated tube is filled without a gap, and the portion exceeding 180 degrees is gradually narrowed toward the tip. And the pitch of the arc frame portions arranged in parallel in the length direction is equal to or 2 to 3 times the pitch of the valley portions of the corrugated tube,
2. The wire harness according to claim 1, wherein the pair of connecting rod portions provided to face the diameter position that is 180 degrees apart are connected to the outer surface of the peak portion of the corrugated tube so as to be continuous with the outer surface of the arc frame portion. Bending restriction member.

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