JP2007159337A - Sheath material for wire harnesses - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regulate twist and a bending direction of a wire harness arranged in a vehicle. <P>SOLUTION: Both end faces are set to be rectangular enclosures 12 and 13 in a lengthwise direction of a cylinder main body 11 in a square cylindrical shape formed of an elastic material. Small diameter cylinders 14 and 15 are projected from centers of the enclosures 12 and 13. A non-stretchable structure 16 where one whole face 11a in four faces of a square cylinder is set to be a plane part, and a stretchable structure 17 formed of a bellow where peaks 17a and troughs 17b are alternately installed in the lengthwise direction of the three remaining faces 11b to 11d, are disposed in the cylinder main body 11. At the time of bending by following bending of the wire harness W/H, the non-stretchable structure 16 of the cylinder main body 11 is extended/contracted to be bent. A bending amount is regulated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exterior material for a wire harness, and is particularly suitable for a wire harness that repeatedly bends and twists, such as a wire harness spanned between a vehicle body and a door of an automobile, and a wire harness wired to a telescopic steering. It is related with the exterior material used.

Conventionally, a bellows tube made of an elastic material such as rubber has been used as an exterior material of a wire harness that repeats this kind of bending and twisting. However, the bellows tube cannot be regulated in the bending direction or the degree of bending. There is a risk of interference with surrounding external interference materials.
In order to solve this problem, in Japanese Patent Application Laid-Open No. 2003-348736 (Patent Document 1), as shown in FIGS. 11 (A) and 11 (B), a curved portion of the ridge portion 2a of the bellows-like cylindrical portion 2 of the grommet 1 The rib pieces 3 are projected from a plurality of peak portions 2a located inside the portion, and when the bellows-like tube portion 2 is bent, the adjacent rib pieces 3 come into contact with each other, so that the bellows-like tube portion 2 is bent. What is regulated is provided.

  In addition, in the Japanese Patent Application Laid-Open No. 2000-217229 (Patent Document 2), the applicant of the present invention is continuous with the peak portion 6a and the valley portion 6b on the outer surface of the bellows-like cylindrical portion 6 of the grommet 5, as shown in FIG. By providing the ribs 7 that project, the expansion and contraction of the bellows-like tube portion 6 can be reduced, and the twist that easily occurs during expansion and contraction is prevented.

However, since the grommet 1 of Patent Document 1 does not regulate the bending direction of the wire harness, it cannot sufficiently prevent interference with other parts during bending.
On the other hand, since the grommet 5 of Patent Document 2 is provided with the rib 7 being continuous with the peak portion 6a and the valley portion 6b, not only can the expansion and contraction of the bellows-shaped cylindrical portion 6 be reduced, but also in the protruding direction of the rib 7. It is thought that the bending of the can be regulated. However, the rib 7 does not continue to the large-diameter portions 8 and 9 for locking the vehicle body provided at both ends of the grommet 1, and the rib 7 itself may be gently twisted. If the rib 7 is twisted even slightly, the bending direction of the bellows-shaped tube portion 6 also changes, so there is room for improvement in accurately regulating the bending direction.

JP 2003-348736 A JP 2000-217229 A

  The present invention has been made in view of the above problems, and provides an exterior material for a wire harness that can follow the bending and twisting of a wire harness, can regulate the degree of bending and twisting, and does not interfere with an external interference material. The challenge is to do.

In order to solve the above-mentioned problems, first, as a first invention, an exterior material that penetrates a wire harness routed in an automobile and can bend following the bending of the wire harness,
Both end faces in the length direction of the rectangular tube-shaped tube body formed from an elastic material have a rectangular-shaped closing portion and a small-diameter tube portion protruding from the center of the closing portion, and
A non-stretchable portion having at least a part of the entire length of one of the four surfaces of the square tube as a flat plate portion in the cylindrical body, and a peak portion and a valley portion on the remaining three surfaces in the length direction. Provide stretchable parts made up of alternating bellows,
Following the wire harness, there is provided an outer covering material for a wire harness that is configured such that the expansion / contraction part of the cylindrical body can be expanded and bent while the bending rate can be regulated by the non-expandable part.

The wire harness exterior material having the above-described configuration has a tubular body having a square cross section over the entire length to the closed portions at both ends, and therefore, excessive twisting and bending are relatively unlikely to occur compared to a cylindrical shape. In addition, since the non-stretchable part is provided with at least a part of the length direction of one of the four sides as a flat plate, the bending direction and the bending amount generated by the expansion and contraction of the stretchable part can be regulated.
In particular, if the non-stretchable portion configured as the flat plate portion is thick and the stretchable portion configured as the bellows portion is thin, the thin bellows portion can be smoothly expanded and contracted when the wire harness is bent. It can be bent on the inner peripheral side and the non-stretchable part on the outer peripheral side, and the direction of bending can be restricted.

  As described above, by being able to regulate the bending direction and the bending amount of the wire harness, it is possible to prevent the wire harness from being pinched by a door or the like at the time of bending or from being damaged due to contact with other parts. In addition, the clearance provided between the wire harness and the interference is not limited to the four directions around the wire harness, it is sufficient to provide only in the bending direction, and the clearance can be minimized by knowing the bent shape in advance. Effective use of the limited in-vehicle space can be achieved.

The said cylinder part main body can be bent in one direction by making one whole surface into a non-expandable part over the full length of a length direction.
Alternatively, the non-stretchable portions can be provided on the two opposite positions at different positions in the length direction so that they can be bent in an S shape.

Further, as a second invention, an exterior material that allows a wire harness to be routed in an automobile to penetrate inside and bendable following the bending of the wire harness,
Both end faces in the length direction of the cylinder body formed of an elastic material are provided with a substantially square-shaped closing part, a protrusion is provided from a part of the periphery of the closing part, and a small-diameter cylindrical part protrudes from the center of the closing part. While letting
The cylindrical body is a bellows cylindrical portion in which crests and troughs continuous in the circumferential direction are alternately provided in the length direction, and ribs protruding from the crests and troughs of the bellows cylindrical portion are continuous in the length direction. The ribs are connected to the projections projecting from the closed portions at both ends,
The rib provides an exterior material for a wire harness that is provided parallel to the axial direction or / and inclined with respect to the axial line according to the bending direction and bending amount of the wire harness.

The portions where the greatest stress is applied during expansion and contraction of the bellows tube portion are both ends, but the wire harness exterior material having the above configuration has a rectangular shape at the both ends and a peripheral edge of the rectangular shape. Since the protrusion that is more continuous with the rib is protruded, the rib is reinforced, and the bending direction restriction and the bending amount restriction by the rib can be ensured,
The rib can be bent following the bending of the wire harness by continuing the required length in parallel with the axial direction at the portion where bending does not occur, and expanding and contracting the crest and trough of the portion where the rib is not formed. It is said.
In this manner, the portion protruding from the rib is defined as a non-stretchable portion, and the portion not protruding from the rib is defined as a stretchable portion, which provides the same function as the flat plate portion of the first invention. Thereby, similarly to 1st invention, a bending direction and a bending amount can be controlled with the presence position of a rib.
In addition, since the bending direction and the bending amount of the wire harness can be regulated, it is possible to prevent the wire harness from being damaged and to effectively use the in-vehicle space.
The rib preferably has a protruding height larger than the thickness. Thereby, the bending | flexion of the bellows cylinder part to the protrusion direction of a rib can be controlled effectively.

  Further, in the bellows tube portion having a quadrangular cross section, the rib protrudes perpendicularly from one surface of the bellows tube portion, of the first corner portion and the second corner portion at both ends in the width direction of the surface. A first linear rib portion that continues in parallel with the axial direction along one first corner portion, and a parallel position in the axial direction along the second corner portion, and a position in the length direction of the first linear rib. The second linear ribs having different from each other and the inclined ribs obliquely crossing the surface between the first linear rib portion and the second linear rib portion are continuous, and the wire harness is formed in an S shape along the ribs. It is good also as a structure which can be bent.

  The ribs bent in the S-shape are preferably provided as a pair of ribs that protrude perpendicularly from the opposing positions of the two opposing surfaces of the bellows tube portion and are parallel to each other. Thereby, a bellows cylinder part can be bent correctly only in the thickness direction of a rib.

Furthermore, the rib may be a straight rib that is continuous between the closed portions at both ends in parallel with the axial direction, and a concave portion that serves as a bending fulcrum may be provided on a side surface of the linear rib at a required position.
In this case, the bending position of the wire harness can also be accurately regulated. Also, depending on the position and number of recesses, it can be bent into a unique shape that cannot occur by natural bending, and can be bent into a desired constant shape according to the surrounding component arrangement and the wiring harness routing design. . For example, if the concave portion is provided at one place, it can be bent in an L shape, and if it is provided at one position at different positions on both side surfaces of the rib, it can be bent into an S shape.
It is preferable that the concave portion is provided continuously at the tip of the peak portion of the bellows tube portion. This is because when the concave portion is provided continuously to the bottom of the valley portion, the concave portion becomes longer in the protruding direction of the rib, so that the rib extends and is easily bent in the protruding direction.

The bellows tube portion may have a circular cross section, the substantially rectangular closed portions at both ends may be provided so as to protrude from the peripheral edge of the bellows tube portion, and a pair of ribs may be provided at symmetrical positions across the central axis.
That is, even when the shape of the bellows cylinder portion is easily twisted, the closed portions at both ends that receive the most stress during expansion and contraction have a substantially quadrangular shape and project from the peripheral edge of the bellows cylinder portion. The twist of the bellows tube portion can be effectively restricted. Further, the configuration in which a pair of ribs are provided at symmetrical positions can also prevent the bellows tube portion from being twisted, and can also more effectively regulate the bending direction of the bellows tube portion.

  As described above, the exterior material for a wire harness according to the present invention can regulate the bending direction, the bending amount, the twisting direction, and the twisting amount of the tubular body. Because the wire harness can be regulated, it is possible to prevent the wire harness from being pinched by the door when it is bent, or from interfering with peripheral devices to cause breakage of the wire harness or damage to the exterior material. Moreover, since the position where a space is required around the wire harness can be limited and the clearance with the interference can be minimized, the limited space in the automobile can be effectively used.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In any of the embodiments, the present invention is applied to an exterior material to be attached to a wire harness that is routed in a place where bending and twisting repeatedly occur in the wire harness.

  FIGS. 1 to 3 show a wire harness exterior material 10 according to a first embodiment of the present invention. At both ends in a length direction of a tubular body 11 having a square cross section, rectangular closure parts 12, 13 are provided. The small-diameter cylindrical portions 14 and 15 projecting from the centers of the closed portions 12 and 13 are formed integrally and continuously with rubber or elastomer.

  As shown in FIG. 1 (A), one surface 11a of the four side surfaces of the cylindrical portion main body 11 is formed in a flat plate shape as a non-stretchable portion 16. The remaining three surfaces 11b, 11c, and 11d serve as bellows-like stretchable portions 17 in which ridges 17a and valleys 17b are alternately provided in the length direction. As shown in FIG. 1B, the thickness t2 of the stretchable portion 17 is made thinner than the plate thickness t1 of the non-stretchable portion 16.

When wiring the wire harness W / H to the automobile using the exterior material 10 having the above-described configuration, as shown in FIG. 2, the wire harness W / H is passed through the interior of the exterior material 10, and the small-diameter cylindrical portion 14. , 15 and the wire harness W / H are wound around the tape T and fixed to each other.
Next, the wire harness W / H bending direction with respect to the vehicle body is set to the arrow A direction and the bending direction is set to the arrow A1 direction, due to the necessity of the wiring harness wiring design and the arrangement design of other in-vehicle components. In a preferred case, the thickness direction of the non-stretchable portion 16 is the same direction as the arrow A direction, and the surface 11a of the non-stretchable portion 16 is directed to the A2 direction opposite to the A1 direction. Route and fix with the surface 11c facing.

  By attaching and routing the exterior material 10 to the wire harness W / H in this way, the cylindrical body 11 of the exterior material 10 that follows the bending of the wire harness W / H is shown in FIGS. 3A and 3B. As shown, the non-stretchable portion 16 can be bent in the direction of arrow A, which is the thickness t1 direction of the non-stretchable portion 16, while it is difficult to bend in the direction of arrow B, which is the plate width w direction of the non-stretchable portion 16. It tends to bend only in the A1 direction with the surface 11c of the easily stretchable portion 17 being on the inner peripheral side and the surface 11a of the non-stretchable portion 16 on the outer peripheral side.

Furthermore, since the cylinder main body 11 has a quadrangular cross section and the four corners are square outward, even if the cylinder main body 11 receives a force in the twisting direction C, first, as shown in FIG. When the interference component 50 is present in the periphery, the cylindrical portion main body 11 is formed into a quadrangular cross section, and any one of the corner portions comes into contact with the interference component 50, whereby the twist of the cylindrical portion main body 11 is restricted.
Therefore, since the twist and bending direction of the exterior member 10 and the direction of bending can be regulated, the bending direction and vibration direction of the wire harness W / H with respect to the vehicle body can always be regulated accurately. Therefore, the wire harness W / H and the exterior material 10 can prevent disconnection and damage due to interference with the other components 50, and the clearance between the exterior material 10 and the surrounding on-vehicle components 50 can be minimized. Can be used effectively.

  Furthermore, as shown in FIG. 3C, when there is no interference part in the position surrounding the entire periphery, and there is an interference part on one side or two sides, the formation position of the non-stretchable part 16 is selected and expanded or contracted. The part 17 can be set in a direction that does not contact the interference member 50 during expansion and contraction. In addition, the amount of bending can be restricted by the formation area of the non-stretchable portion 16 so as not to contact the interference component 50.

4 and 5 show a second embodiment of the present invention.
A flat non-stretchable portion 16 is provided on each half of the two side surfaces 11a and 11c of the four side surfaces of the cylindrical portion main body 11 that are different in the length direction position, and each remaining half surface serves as a bellows-like stretchable portion 17. Yes. The other two surfaces 11b and 11d are constituted only by the bellows-like stretchable portion 17.

  In this embodiment, when the exterior material 10 follows the bending of the wire harness W / H, as shown in FIG. 5A, the half on the small diameter cylindrical portion 14 side of the cylindrical portion main body 11 is not stretched on the surface 11a. While trying to bend in the A1 direction with the part 16 on the outer peripheral side and the expansion / contraction part 17 of the surface 11c on the inner peripheral side, the half on the small diameter cylindrical part 15 side of the cylindrical part main body 11 has the non-expandable part 16 of the surface 11c. At the outer peripheral side, the expansion / contraction part 17 of the surface 11a is set to the inner peripheral side to bend in the A2 direction. Further, as shown in FIG. 5B, the bending of the non-stretchable portion 16 in the plate width direction, that is, the arrow B direction is restricted.

  Therefore, as shown in FIG. 5 (A), when the parts 50 are arranged close to both sides of the exterior member 10, a large bending space cannot be provided in the A1 direction or the A2 direction of the cylindrical body 11, In addition, when there is no space in the vertical direction, the tubular body 11 is bent accurately in an S shape by attaching the outer packaging material 10 of the present embodiment to the wire harness W / H, and also in the A1 direction. It can regulate so that it may not bend greatly also in A2 direction. Thereby, the freedom degree of component arrangement | positioning and wire harness wiring design can be raised.

6 and 7 show a wire harness exterior material 20 according to a third embodiment of the present invention.
A rectangular closure part 26, 27 and a small-diameter cylindrical part 28, 29 projecting from the center of the closure part 26, 27 are continuously made of rubber or elastomer at both ends in the longitudinal direction of the cylindrical part body 21 having a rectangular cross section. Molded integrally.

As shown in FIG. 6 (A), the four side surfaces 22 to 25 of the cylindrical body 21 have a bellows shape in which crests 21a and troughs 21b that are continuous in the circumferential direction are provided alternately in the length direction over the entire length. Is formed.
The first straight rib 30a, the inclined rib 30c, and the second straight rib 30b that protrude from the peak portion 21a and the valley portion 21b are continuously provided in the length direction on one surface 22 of the four side surfaces of the cylindrical body 21. Ribs 30 are erected vertically.

  Specifically, the first straight rib 30a and the second straight rib 30b that are continuous in parallel with the axial direction along the first corner portion 22a and the second corner portion 22b at both ends in the width direction of the surface 22 are erected, and the first straight line In the present embodiment, the first linear rib 30a is erected in the range of about 1/3 of the total length of the tubular body 21 from the end on the closing portion 26 side. The second linear rib 30b is erected in the range of about 1/3 of the entire length of the cylindrical body 21 from the end on the closing portion 27 side, and the surface 22 is interposed between the first linear rib 30a and the second linear rib 30b. Are continuously provided with an inclined rib 30c that crosses diagonally.

  Similarly to the rib 30, the rib 31 formed by continuously connecting the first straight rib 31 a, the inclined rib 31 c, and the second straight rib 31 b is also formed on the one surface 24 facing the surface 22 of the cylindrical body 21 with the rib 30. Stands vertically in the opposite direction. The rib 31 is formed in a position parallel to the rib 30.

  As shown in FIG. 6B, the ribs 30 and 31 have a thickness t3 set smaller than the protruding height h1 from the tip of the bellows crest 21a.

  Projections 26 a, 26 b, 27 a, 27 b are projected from the part of the periphery of the closures 26, 27 in the projecting direction of the ribs 30, 31, and the projections 26 a, 27 a are connected to both ends of the rib 30. The protrusions 26 b and 27 b are made continuous with both ends of the rib 31.

  When the wire harness W / H is routed to an automobile using the exterior material 20 having the above structure, when the exterior material 20 follows the bending of the wire harness W / H, as shown in FIG. While the main body 21 tries to bend in the thickness t3 direction of the ribs 30 and 31, that is, in the A direction, as shown in FIG. 7B, the protrusion height h1 direction of the ribs 30 and 31 in the B direction is determined. It becomes difficult to bend. In addition, the portion where the first linear ribs 30a and 31a are formed tends to bend in the A1 direction with the ribs 30a and 31a being the outer peripheral side, and the portion where the second linear ribs 30b and 31b are formed is the ribs 30b and 31b. It tries to bend in the A2 direction on the outer peripheral side.

  Therefore, as shown in FIGS. 7A and 7B, a large bending space is provided in the A1 direction and the A2 direction of the cylindrical portion main body 21 when the parts 50 are arranged close to both sides of the exterior material 20, for example. If there is no space in the vertical direction, the tubular body 21 is accurately placed along the ribs 30 and 31 by attaching the exterior member 20 of the present embodiment to the wire harness W / H. It can be bent so that it does not bend significantly in either the A1 direction or the A2 direction.

In addition, since the ribs 30 and 31 are formed continuously over the entire length of the cylindrical portion main body 21, the twisting and bending in the B direction of the cylindrical portion main body 21 can be more reliably regulated.
Further, the ribs 30 and 31 are formed up to the peripheral edges of the closing portions 26 and 27 at both ends that receive the greatest stress when the cylindrical body 21 is expanded and contracted, and are continuous with the protrusions 26a, 26b, 27a, and 27b. As shown in FIG. 7C, even when the cylindrical body 21 receives a force in the twisting direction C, the protruding portions 26a, 26b, 27a protruding from the ribs 30, 31 or the closed portions 26, 27 are provided. When 27b collides with the surrounding vehicle-mounted components, the twist of the cylinder part main body 21 can be controlled effectively.

8 and 9 show a wire harness sheath 40 according to a fourth embodiment of the present invention.
A rectangular closure part 42, 43 and a small diameter cylinder part 44, 45 projecting from the center of the closure part 42, 43 are continuously integrated with rubber or elastomer at both ends in the longitudinal direction of the cylinder body 41 having a circular cross section. It is molded into.

  As shown in FIG. 8 (A), the cylindrical part body 41 is formed in a bellows shape in which the entire length of the cylinder part body 41 is alternately provided with crest parts 41a and trough parts 41b in the circumferential direction.

A pair of ribs 46 and 47 that protrude from the crest portion 41a and the trough portion 41b and continue in the length direction are provided on the outer peripheral surface of the cylindrical portion main body 41 so as to protrude from the target position with the central axis interposed therebetween.
On one side 46a of the rib 46, recesses 48a and 48b are provided at two positions spaced in the length direction. As shown in FIG. 8B, the rib 47 also has the same direction as the side 46a. On the side surface 47a, concave portions 49a and 49b are provided so as to align with the concave portions 48a and 48b in the longitudinal direction. These recesses 48 a, 48 b, 49 a, 49 b are all provided continuously to the tip of the crest 41 a of the cylinder body 41.

  As shown in FIG. 8C, the ribs 46 and 47 have a thickness t4 set smaller than the protruding height h2 from the tip of the bellows peak 41a.

  The closing portions 42 and 43 are formed to be larger than the end surface of the cylindrical portion main body 41, and projecting portions 42 a, 42 b, 43 a and 43 b are projected from the peripheral edge of the cylindrical portion main body 41 in the protruding direction of the ribs 46 and 47. ing. The protrusions 42a and 43a are connected to both ends of the rib 46 in a T shape, and the protrusions 42b and 43b are connected to both ends of the rib 47 in a T shape.

  When the wire harness W / H is routed to an automobile using the exterior material 40 having the above structure, when the exterior material 40 follows the bending of the wire harness W / H, as shown in FIG. The part main body 41 tries to bend in the thickness t4 direction of the ribs 46 and 47, that is, in the A direction, while, as shown in FIG. 9B, the protrusion height h2 direction of the ribs 46 and 47, that is, in the B direction. It becomes difficult to bend. In addition, since the concave portions 48a, 48b, 49a, 49b are formed in the ribs 46, 47, the concave portions 48a, 49a are used as the first fulcrum, and the concave portions 48b, 49b are used as the second fulcrum, so that the A2 direction has a fixed shape. Try to bend only.

  Furthermore, the closed portions 42 and 43 at both ends that receive the greatest stress when the tube main body 41 is expanded and contracted are formed in a quadrangular shape, and the protrusions 42a, 42b, 43a, and 43b are projected from the peripheral edge of the tube main body 41 to be angular. Therefore, as shown in FIG. 9 (C), even when the cylinder main body 41 receives a force in the twisting direction C, the protrusions 42a, 42b, 43a, 43b collide with surrounding vehicle-mounted parts, The twist of the part main body 41 can be effectively controlled.

FIG. 10 shows a first modification of the fourth embodiment.
Recesses 48a and 48b (49a and 49b) are formed at one location at intervals on both side surfaces 46a and 46b (47a and 47b) of the rib 46 (47). Thereby, when the exterior material 40 follows the bending of a wire harness, the cylinder part main body 41 can be bent in S shape.

  Thus, by providing the recesses 48a, 48b, 49a, 49b in advance in the ribs 46, 47, the cylindrical portion main body 41 can be bent into a desired fixed shape. The degree of freedom in layout design can be increased. One recess may be provided for each rib, or three or more recesses may be provided.

  In addition, this invention is not limited to the said embodiment and modification. The ribs 30, 31, 46, 47 may not be formed as a pair, but only one.

BRIEF DESCRIPTION OF THE DRAWINGS The exterior material for wire harnesses which concerns on 1st embodiment of this invention is shown, (A) is a whole perspective view, (B) is II sectional view taken on the line. It is a perspective view which shows the state which penetrated and fixed the wire harness to the exterior material for wire harnesses shown in FIG. The bending state of a wire harness is shown, (A) is a top view, (B) is a front view, (C) is explanatory front view which shows a state when receiving the force of a twist direction. It is a whole perspective view which shows the exterior material for wire harnesses which concerns on 2nd embodiment of this invention. The bending state of the wire harness which mounted | wore the exterior | packing material for wire harnesses shown in FIG. 4 is shown, (A) is a top view, (B) It is a front view. The exterior material for wire harnesses which concerns on 3rd embodiment of this invention is shown, (A) is a perspective view, (B) is a front view. 6 shows a bent state of the wire harness mounted with the wire harness exterior material shown in FIG. 6, (A) is a plan view, (B) is a front view, and (C) is subjected to a twisting force. It is explanatory front view which shows the state. The exterior material for wire harnesses which concerns on 4th embodiment of this invention is shown, (A) is a perspective view, (B) is a side view, (C) is an VIII-VIII line principal part expanded sectional view. . 8 shows a bent state of the wire harness attached with the wire harness exterior material shown in FIG. 8, (A) is a plan view, (B) is a front view, and (C) is subjected to a twisting force. It is explanatory front view which shows the state. It is a top view which shows the modification 1 of 4th embodiment. It is a figure of a prior art example. It is a figure of another prior art example.

Explanation of symbols

10, 20, 40 Wire harness exterior material 11, 21, 41 Tubular body 12, 13, 26, 27, 42, 43 Closure 16 Non-stretchable
17 Stretchable part 30, 31, 46, 47 Rib 48a, 48b, 49a, 49b Recessed part W / H Wire harness

Claims (7)

It is an exterior material that allows a wire harness routed in an automobile to penetrate inside and bendable following the bending of the wire harness,
Both end faces in the length direction of the rectangular tube-shaped tube body formed from an elastic material have a rectangular-shaped closing portion and a small-diameter tube portion protrudes from the center of the closing portion, and
A non-stretchable portion having at least a part of the entire length of one of the four surfaces of the square tube as a flat plate portion in the cylindrical body, and a peak portion and a valley portion in the length direction on the remaining three surfaces. Provide stretchable parts made up of alternating bellows,
An exterior material for a wire harness that is configured to follow the wire harness so that the expansion / contraction part of the cylindrical body can be expanded and bent while the bending rate can be regulated by the non-expandable part. The cylindrical body is bendable in one direction, with one entire surface as a non-stretchable part over the entire length in the length direction,
Alternatively, the sheathing material for a wire harness according to claim 1, wherein a non-stretchable portion is provided on two surfaces at opposite positions with different positions in the length direction so as to be bent in an S shape. It is an exterior material that allows a wire harness to be routed in an automobile to penetrate inside and bendable following the bending of the wire harness,
Both end faces in the length direction of the cylinder body formed of an elastic material are provided with a substantially square-shaped closing part, a protrusion is provided from a part of the periphery of the closing part, and a small-diameter cylindrical part protrudes from the center of the closing part. While letting
The cylindrical body is a bellows cylindrical portion in which crests and troughs continuous in the circumferential direction are alternately provided in the length direction, and ribs protruding from the crests and troughs of the bellows cylindrical portion are continuous in the length direction. The ribs are connected to the projections projecting from the closed portions at both ends,
The rib is an exterior material for a wire harness provided in parallel with the axis direction or / and inclined with respect to the axis according to the bending direction and the bending amount of the wire harness.   The rib can be bent following the bending of the wire harness by continuing the required length parallel to the axial direction at the portion where bending does not occur, and expanding and contracting the crest and trough of the portion where the rib is not formed The exterior material for a wire harness according to claim 3. The bellows tube portion has a quadrangular cross-section, and the rib protrudes perpendicularly from one surface of the bellows tube portion, and one of the first and second corner portions at both ends in the width direction of the surface. A first linear rib portion that continues in parallel with the axial direction along the first corner portion, and a parallel portion in parallel with the axial direction along the second corner portion, and the longitudinal direction position is different from that of the first linear rib. The second straight ribs and the inclined ribs that obliquely cross the surface between the first straight rib portions and the second straight rib portions,
The exterior material for a wire harness according to claim 3 or 4, wherein the wire harness can be bent in an S shape along the rib.   5. The rib according to claim 3, wherein the rib is a straight rib continuous in parallel with the axial direction between the closed portions at both ends, and a concave portion serving as a bending fulcrum is provided on a side surface at a required position of the linear rib. Exterior material for wire harness.   The said bellows cylinder part is circular in cross section, the substantially square-shaped closure part of the said both ends is provided protruding from the peripheral edge of a bellows cylinder part, and the said rib is provided in a symmetrical position on both sides of a central axis. The exterior material for a wire harness according to any one of 6.

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