阅读说明：本技术 电线用护套及具有护套的线束 (Sheath for electric wire and wire harness having the same ) 是由 押野贵志 龟井好一 须山博史 横关秀司 儿岛直之 于 2019-09-10 设计创作，主要内容包括：本发明提供一种电线用护套及具有护套的线束,其可以减小因车辆等的振动而导致安装在车辆等上的护套及护套内的线束振动所产生的振动声。该电线用护套通过树脂片弯折而形成,并安装在电线的外周,其包括多个壁部,所述多个壁部沿着所述电线的延伸方向延伸,并形成用于收纳所述电线的收纳部,且在所述多个壁部中的至少一个壁部设置有从该壁部突出的突出部。(The invention provides a sheath for electric wire and a wire harness with the sheath, which can reduce vibration sound generated by vibration of the sheath and the wire harness in the sheath, wherein the vibration sound is caused by vibration of a vehicle and the like. The sheath for electric wires is formed by bending a resin sheet, is attached to the outer periphery of the electric wires, and includes a plurality of wall portions extending in the extending direction of the electric wires and forming a housing portion for housing the electric wires, and at least one of the wall portions is provided with a protruding portion protruding from the wall portion.)

1. A sheath for electric wire, which is formed by bending a resin sheet and is attached to the outer periphery of an electric wire,

the sheath for electric wire includes a plurality of wall portions extending in an extending direction of the electric wire and forming a housing portion for housing the electric wire,

at least one of the plurality of wall portions is provided with a protruding portion protruding from the wall portion.

2. The sheath for electric wire according to claim 1, wherein the protrusion protrudes toward a specific direction with respect to an extending direction of the electric wire where the protrusion is located.

3. The sheath for electric wire according to claim 2, wherein the specific direction is a vertical direction.

4. A sheath for electric wires according to any one of claims 1 to 3, wherein a plurality of the projections are provided at predetermined intervals along an extending direction of the electric wire at an edge portion of the wall portion along the extending direction of the electric wire.

5. The sheath for electric wire according to any one of claims 1 to 4, wherein the protruding portion is provided at a 1 st edge portion of the wall portion in the extending direction of the electric wire and a 2 nd edge portion opposed to the 1 st edge portion and in the extending direction of the electric wire.

6. The sheath for electric wire according to claim 5, wherein the projections are arranged in a staggered manner.

7. The sheath for electric wire according to any one of claims 1 to 6, wherein a width of a tip portion of the protrusion is narrower than a base portion of the protrusion.

8. The sheath for electric wire according to any one of claims 1 to 7, wherein a shape of a projecting direction of the projecting portion is a triangle, a trapezoid, a rectangle, or a quadrangle in which at least a part of corners is formed in a rounded shape.

9. The sheath for electric wire according to any one of claims 1 to 8, wherein a tip end portion of the protruding portion has a corrugated shape.

10. The sheath according to any one of claims 1 to 9, wherein the protruding portions are arranged at intervals of 3cm to 20cm along an extending direction of the electric wire.

11. A wire harness having a sheath, characterized by comprising:

a wire harness; and

the sheath for electric wire according to any one of claims 1 to 10,

the sheath for electric wire is attached to the outer periphery of the wire harness.

Technical Field

The present invention relates to a sheath for electric wires attached to the outer periphery of an electric wire in order to protect the electric wire such as a wire harness, and a wire harness having the sheath.

Background

Conventionally, a wire harness sheath has been used to attach and fix a wire harness to a vehicle body or the like. Further, by housing the wire harness in the housing portion of the sheath, the sheath performs a function of adjusting the path of the wire harness and a function of protecting the wire harness. On the other hand, due to vibration of the vehicle or the like, the sheath or the wire harness attached to the inside of the sheath of the vehicle or the like vibrates, and vibration sound is generated in some cases. From the viewpoint of ride comfort of a vehicle or the like, it is necessary to reduce the vibration sound.

For example, suppression of vibration noise can be expected by preventing the wire harness from rattling within the sheath. Therefore, a measure is taken to position and fix the wire harness within the sheath.

As the sheath for a wire harness, for example, there is proposed a sheath including a support plate portion on which a wire harness is placed, a base member which has a protruding plate portion protruding from the support plate portion and extends in a wire harness extending direction, and a wall portion addition member which is assembled to the base member and to which a wall portion covering the wire harness is added, the wall portion addition member having an L-shaped cross section, and one end portion thereof is connected to one of the support plate portion and the protruding plate portion to which the one end portion is assembled via a positioning and holding mechanism (patent document 1).

In the sheath for a wire harness of patent document 1, although the wire harness is positioned inside the sheath, there is still room for improvement in reducing vibration sound caused by vibration of a vehicle or the like.

(Prior art document)

(patent document)

Patent document 1: JP patent publication No. 2017-135814.

Disclosure of Invention

(problems to be solved by the invention)

The present invention has been made in view of the above circumstances, and an object thereof is to provide a sheath for electric wire and a wire harness having the sheath, which can reduce vibration sound generated by vibration of the sheath and the wire harness attached to a vehicle or the like due to vibration of the vehicle or the like.

(means for solving the problems)

The electric wire sheath and the wire harness having the sheath according to the present invention have the following constitutions.

[1] A sheath for electric wire, which is formed by bending a resin sheet and is attached to the outer periphery of an electric wire,

the sheath for electric wire includes a plurality of wall portions extending in an extending direction of the electric wire and forming a housing portion for housing the electric wire,

at least one of the plurality of wall portions is provided with a protruding portion protruding from the wall portion.

[2] The sheath for electric wire according to [1], wherein the protrusion protrudes toward a specific direction with respect to an extending direction of the electric wire where the protrusion is located.

[3] The sheath for electric wire according to [2], wherein the specific direction is a vertical direction.

[4] The sheath for electric wire according to any one of [1] to [3], wherein a plurality of the protruding portions are provided at predetermined intervals along an extending direction of the electric wire at an edge portion of the wall portion along the extending direction of the electric wire.

[5] The sheath for electric wire according to any one of [1] to [4], wherein the protrusion is provided at a 1 st edge portion of the wall portion along an extending direction of the electric wire and a 2 nd edge portion facing the 1 st edge portion and along the extending direction of the electric wire.

[6] The sheath for electric wire according to [5], wherein the projections are arranged in a staggered manner.

[7] The electric wire sheath according to any one of [1] to [6], wherein a width of a tip portion of the protruding portion is narrower than a base portion of the protruding portion.

[8] The sheath for electric wire according to any one of [1] to [7], wherein a shape of the projecting portion in a projecting direction is a triangle, a trapezoid, a rectangle, or a quadrangle having at least a part of corners formed in a rounded shape.

[9] The sheath for electric wire according to any one of [1] to [8], wherein a tip end portion of the protruding portion has a corrugated shape.

[10] The sheath for electric wire according to any one of [1] to [9], wherein the protruding portions are arranged at intervals of 3cm to 20cm along an extending direction of the electric wire.

[11] A wire harness having a sheath, comprising:

a wire harness; and

[1] the sheath for electric wire according to any one of [1] to [10],

the sheath for electric wire is attached to the outer periphery of the wire harness.

The sheath for electric wires according to the present invention is attached to an object to which the sheath for electric wires is attached, such as a vehicle, so that a tip end portion of a protruding portion provided in at least one of the plurality of wall portions contacts the object.

(effect of the invention)

According to the form of the sheath for electric wires of the present invention, by providing the protruding portion on at least one of the plurality of wall portions, the contact area between the sheath for electric wires and the mounting object such as a vehicle can be reduced, and even when the vehicle vibrates, the vibration noise generated by the vibration of the sheath for electric wires and the wire harness inside the sheath for electric wires can be reduced.

Drawings

Fig. 1 is a perspective view illustrating an outline of a sheath for electric wires and a wire harness having the sheath according to embodiment 1 of the present invention.

Fig. 2 is an explanatory view showing a state in which the sheath for electric wire of embodiment 1 is spread.

Fig. 3 is a side view schematically illustrating a sheath for electric wires and a wire harness having the sheath according to embodiment 2 of the present invention.

Fig. 4 is a side view schematically illustrating a sheath for electric wires and a wire harness having the sheath according to embodiment 3 of the present invention.

Fig. 5(a) to (c) are explanatory views each showing the shape of the protruding portion of the sheath for electric wire according to another embodiment of the present invention.

Fig. 6 is an explanatory view showing the shape of the tip end portion of the protruding portion of the sheath for electric wires according to another embodiment of the present invention.

Detailed Description

Hereinafter, a sheath for an electric wire according to an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic perspective view illustrating a sheath for electric wires and a wire harness having the sheath according to embodiment 1 of the present invention. Fig. 2 is an explanatory view showing a state in which the sheath for electric wire of embodiment 1 is spread. Fig. 3 is a side view schematically illustrating a sheath for electric wires and a wire harness having the sheath according to embodiment 2 of the present invention. Fig. 4 is a side view schematically illustrating a sheath for electric wires and a wire harness having the sheath according to embodiment 3 of the present invention. Fig. 5(a) to (c) are explanatory views each showing the shape of a projecting portion of an electric wire sheath according to another embodiment of the present invention. Fig. 6 is an explanatory view showing the shape of the tip end portion of the protruding portion of the sheath for electric wires according to another embodiment of the present invention.

First, a wire harness 1 with a sheath according to embodiment 1 of the present invention will be described with reference to fig. 1. A sheathed wire harness 1 according to embodiment 1 of the present invention includes a wire harness 2 in which a plurality of wires are bundled, and a sheath (wire sheath) 11 attached to an outer periphery of the wire harness 2. In fig. 1, the wire harness 2 is shown in a single cylindrical shape, but the wire harness 2 is actually formed by bundling a plurality of wires.

Next, a sheath 11 for an electric wire according to embodiment 1 of the present invention will be described. As shown in fig. 1, the sheath 11 for electric wires includes a plurality of wall portions 20 extending along the extending direction of the wire harness 2 (the longitudinal direction x of the sheath 11 for electric wires). In fig. 1, for convenience of explanation, the extending direction of the wire harness 2 (the longitudinal direction x of the sheath 11 for electric wires) is linear. The space surrounded by the plurality of wall portions 20 serves as a housing portion 31 for housing the wire harness 2. That is, the sheath 11 for electric wire has a housing 31 surrounded by the plurality of walls 20. The wire harness 2 is protected from the external environment by the sheath 11 for electric wires.

The plurality of wall portions 20 of the sheath 11 for electric wires are integrally formed by bending one resin sheet (for example, a thermoplastic resin foam sheet). The resin sheet is bent at the bent portions 200a to 200d, thereby forming the plurality of wall portions 20. The plurality of wall portions 20 include a planar bottom wall portion 21, a planar side wall portion 22 continuously provided from an end edge of the bottom wall portion 21 via the bent portion 200a, a planar side wall portion 23 continuously provided from an end edge of the bottom wall portion 21 via the bent portion 200b, a planar inner cover wall portion 24 continuously provided from a front end of the side wall portion 22 via the bent portion 200c, and a planar outer cover wall portion 25 continuously provided from a front end of the side wall portion 23 via the bent portion 200 d. The outer cover wall portion 25 is disposed so as to cover and overlap the inner cover wall portion 24 from above, thereby forming a wall portion overlapping portion.

As shown in fig. 1, in a cross section in a direction (width direction y in fig. 1) orthogonal to the extending direction of the wire harness 2, the bottom wall portion 21 of the plurality of wall portions 20 is disposed so as to face the inner cover wall portion 24 and the outer cover wall portion 25 and to be substantially parallel to the inner cover wall portion 24 and the outer cover wall portion 25. Side wall portion 22 of plurality of wall portions 20 faces side wall portion 23, and is arranged substantially parallel to side wall portion 23. That is, the plurality of wall portions 20 have two wall portions facing each other in the cross section in the width direction y. The plurality of wall portions 20 have a rectangular cross-sectional shape in the width direction y.

Of the side wall portion 22 and the side wall portion 23 which are disposed to face each other, the side wall portion 23 is provided with a protruding portion 40 which protrudes from the side wall portion 23. The side wall portion 23 has a protrusion 40 protruding in a specific direction with respect to the extending direction of the wire harness 2 where the protrusion 40 is located. In the sheath 11 for electric wires, the projecting portion 40 of the side wall portion 23 projects in a direction perpendicular to the extending direction of the wire harness 2 where the projecting portion 40 is located. That is, the protruding portion 40 protrudes in the vertical direction with respect to the side wall portion 23. The protruding portion 40 protrudes in a direction substantially parallel to the inner cover wall portion 24 and the outer cover wall portion 25, and extends substantially on the same plane as the outer cover wall portion 25. Further, the protruding portion 40 protrudes in a direction substantially parallel to the bottom wall portion 21.

The sheath 11 for electric wire is attached to the object to be attached as follows: the side wall portion 23 provided with the protruding portion 40 is opposed to an attachment site of an attachment object (not shown) such as a vehicle, and the leading end portion 41 of the protruding portion 40 contacts the attachment object. By providing the protruding portion 40 on at least one of the plurality of wall portions 20 (the side wall portion 23 in the sheath 11 for electric wire), the contact area between the sheath 11 for electric wire and the mounting object such as a vehicle can be reduced, and even when the vehicle vibrates, the vibration noise generated by the vibration of the sheath 11 for electric wire and the wire harness 2 in the sheath 11 for electric wire can be reduced.

In the sheath 11 for electric wire, the protruding portion 40 is provided at two opposite edge portions of the side wall portion 23 in the extending direction of the wire harness 2, that is, one of the 1 st edge portion 23-1 and the 2 nd edge portion 23-2 (the 1 st edge portion 23-1 provided on the outer cover wall portion 25 side in fig. 1). In the sheath 11 for electric wires, a plurality of the protruding portions 40 are provided at predetermined intervals along the extending direction of the wire harness 2. The interval between the protruding portions 40 is not particularly limited, and is preferably 3cm to 20cm, and more preferably 5cm to 10cm, for example, in order to reduce vibration noise more reliably and to stably attach the mounting object such as a vehicle. The "interval between the protruding portions" refers to the length of the portion where the protruding portion 40 is not provided in the extending direction of the wire harness 2, over the entire wall portion where the protruding portion 40 is provided.

The shape of the projecting portion 40 in the projecting direction is not particularly limited, and the shape of the sheath 11 for electric wires is a quadrangle. Specifically, the shape of the protruding portion 40 in the protruding direction is a rectangle (rectangle) in which the width of the distal end portion 41 of the protruding portion 40 is the same as the width of the base portion 42 of the protruding portion. Further, the front end 41 of the protruding portion 40 is formed linearly along the extending direction of the wire harness 2. The thickness of the projection 40 corresponds to the thickness of the resin sheet forming the plurality of wall portions 20.

The size of the protruding portion 40 is not particularly limited, and for example, the size in the extending direction of the wire harness 2 may be 5mm to 20 mm. The dimension between the tip portion 41 and the base portion 42 is, for example, 1mm to 10 mm.

As shown in fig. 1, the wire sheath 11 is provided with a locking piece 50 protruding from the distal end of the inner cover wall 24. Further, a through hole 51 is formed in the 2 nd edge portion 23-2 side of the protruding portion 40 so as to contact the protruding portion 40. The locking pieces 50 are provided at predetermined intervals corresponding to the positions of the through holes 51. The locking piece 50 is inserted into the through hole 51, and the locking piece 50 is inserted into the through hole 51, thereby locking the locking piece 50 in the through hole 51. By locking the locking piece 50 to the through hole 51, the inner lid wall 24 is fixed to the side wall 23, and the plurality of walls 20 and the housing 31 are maintained in a predetermined shape. Therefore, the locking piece 50 is disposed so as to overlap the protruding portion 40.

As shown in fig. 1, the housing portion 31 is a portion surrounded by the bottom wall portion 21, the side wall portions 22 and 23, the inner lid wall portion 24, and the outer lid wall portion 25. The housing portion 31 is formed in a tubular shape penetrating one side and the other side opposite to the one side in the longitudinal direction x by the bottom wall portion 21, the side wall portions 22 and 23, the inner lid wall portion 24, and the outer lid wall portion 25, and houses the wire harness 2.

The resin sheet used for the sheath 11 for electric wire is not particularly limited as long as it is bendable, and a thermoplastic resin sheet or a thermosetting resin sheet can be used. Among them, foamed sheets are preferable, and particularly, foamed sheets of thermoplastic resins are preferable, from the viewpoints of light weight, freedom in shape design, cost, and the like. The resin type of the thermoplastic resin foamed sheet is not particularly limited, and any thermoplastic resin can be used as long as it is a thermoplastic resin, and examples thereof include polyethylene resin, polypropylene resin, polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyamide resin, polyphenylene sulfide resin, polystyrene resin, polyvinyl chloride resin, polyvinyl acetate resin, polytetrafluoroethylene resin, acrylic resin, and the like.

The density of the thermoplastic resin foam sheet used for the sheath 11 for electric wire is not particularly limited, and for example, the density is improved for electric wire from the viewpoint of preventing anisotropy of mechanical propertiesThe design freedom of the sheath 11 is preferably 200Kg/m from the viewpoint of further improving the mechanical strength against the bidirectional stress of the wire harness housed in the sheath 11 for electric wire³Above 1000Kg/m³From the viewpoint of further improving the balance between the light weight and the mechanical strength, 300Kg/m is more preferable³Above and 600Kg/m³Hereinafter, it is particularly preferably 350Kg/m³Above 550Kg/m³The following.

The thickness of the thermoplastic resin foamed sheet is not particularly limited, and is preferably 0.5mm or more and 4.0mm or less, and particularly preferably 1.0mm or more and 2.5mm or less, from the viewpoint of further improving the balance between the flexibility and the mechanical strength, for example. Further, a non-foamed layer may be formed on both surfaces or one surface of the thermoplastic resin foamed sheet. That is, the thermoplastic resin foam sheet may be configured to include a foamed layer and a non-foamed layer formed on the foamed layer. By forming the non-foamed layer on the surface of the thermoplastic resin foamed sheet, the mechanical strength of the sheath 11 for electric wires is further improved, and the protection performance of the wire harness 2 stored in the storage section 31 is further improved. The thickness of the non-foamed layer is not particularly limited, and examples thereof include 10 μm to 100 μm.

The number density of cells in the foamed layer of the thermoplastic resin foamed sheet is not particularly limited, and the lower limit thereof is preferably 800 cells/mm from the viewpoint of more reliably preventing anisotropy of mechanical properties³More than, particularly preferably 1000/mm³The above. On the other hand, from the viewpoint of more reliably obtaining excellent mechanical strength, the upper limit value of the number density of the bubbles is, for example, 10¹⁰Per mm³The following. The bubble number density in the present invention is calculated by the following method: scanning Electron Microscope (SEM) photograph of a longitudinal section of a thermoplastic resin foamed sheet was taken, the number of cells n present in any 100X 100 μm region of the foamed layer on the SEM photograph was counted, and the number of cells per 1mm was calculated²The number of bubbles of (2) is converted to 1mm per unit by raising the value to 3/2 th power³The number of bubbles of (2).

Next, a method of attaching the wire harness 2 to the sheath 11 for electric wire to form the sheathed wire harness 1 will be described with reference to fig. 1 and 2.

First, a cutting process is performed to cut out a portion constituting the sheath 11 for the electric wire from a resin sheet (for example, a thermoplastic resin foamed sheet) which is a base material for forming the sheath 11 for the electric wire. As shown in fig. 2, a projection 50 'serving as the locking piece 50 is also formed when the cutting process is performed, and the projection 50' projects from a portion serving as the inner cover wall portion 24. Next, on the cut resin sheet, for example, by half-cut processing that does not penetrate the resin sheet in the thickness direction, a bent portion 200a, a bent portion 200b, a bent portion 200c, and a bent portion 200d are formed, respectively. Then, a notch 40' corresponding to the shape and size of the protrusion 40 is formed from the bent portion 200d, which is the 1 st edge portion 23-1 at the boundary between the side wall portion 23 and the outer lid wall portion 25, toward the bent portion 200b, which is the 2 nd edge portion 23-2 at the boundary between the side wall portion 23 and the bottom wall portion 21. The slits 40' corresponding to the shape of the projections 40 penetrate the resin sheet in the thickness direction.

Then, the bottom wall 21, the side wall 22, and the side wall 23 are formed by bending the bent portions 200a and 200 b. Then, the wire harness 2 is inserted through the opening between the side wall portions 22 and 23 and placed on the bottom wall portion 21. Next, after the inner lid wall portion 24 is formed by bending the bent portion 200c, the outer lid wall portion 25 is formed by bending the bent portion 200 d. When the bent portion 200d is bent, the notch 40' corresponding to the shape of the protruding portion 40 protrudes from the side wall portion 23 in the direction perpendicular to the longitudinal direction x, thereby forming the protruding portion 40. Further, the through hole 51 is formed in the side wall portion 23 by forming the protruding portion 40 from the notch 40'. Therefore, the position and shape of the through hole 51 correspond to those of the slit 40'.

Next, the projections 50' of the resin sheet, i.e., the locking pieces 50, are inserted into the through holes 51, whereby the inner cover wall portion 24 is fixed to the side wall portion 23, and the storage portion 31 is formed. Thus, the wire harness 2 is inserted and penetrated into the housing portion 31 of the sheath 11 for electric wire, and the wire harness 1 having the sheath can be formed.

As described above, the cut 40' penetrating the resin sheet in the thickness direction is formed at the boundary between the side wall portion 23 and the outer lid wall portion 25, whereby the protruding portion 40 is formed when the bent portion 200d is bent, and thus the protruding portion 40 can be easily and quickly provided.

Next, a sheath 61 for an electric wire according to embodiment 2 of the present invention will be described. The same components as those of the electric wire sheath 11 according to embodiment 1 will be described with the same reference numerals.

In the sheath 11 for electric wires according to embodiment 1, the side wall portion 23 is provided with the protruding portion 40 at only one of two opposing edge portions along the extending direction of the wire harness 2. Alternatively, as shown in fig. 3, in the sheath 61 for electric wire of embodiment 2, a plurality of projecting portions 40a to 40c are provided at predetermined intervals in both of the 1 st edge portion 23-1 and the 2 nd edge portion 23-2, which are two opposing edge portions of the side wall portion 23 along the extending direction of the wire harness 2 (the longitudinal direction x of the sheath 61 for electric wire). The projections 40-1a to 40-1c provided in the 1 st edge portion 23-1 are disposed to face the projections 40-2a to 40-2c provided in the 2 nd edge portion 23-2, respectively. Therefore, the projecting portions 40-1a to 40-1c provided in the 1 st edge portion 23-1 and the projecting portions 40-2a to 40-2c provided in the 2 nd edge portion 23-2 are arranged on a straight line in a direction orthogonal to the longitudinal direction x, respectively. Further, through holes 51-a to 51-c that come into contact with the protruding portions 40-2a to 40-2c are formed on the 1 st edge portion 23-1 side of the protruding portions 40-2a to 40-2 c.

By providing the opposing protrusions 40 at two opposing edge portions along the extending direction of the wire harness 2, the sheath 61 for electric wire can be more stably fixed to an object to be mounted such as a vehicle.

In the sheath 61 for electric wires according to embodiment 2, the cut resin sheet is provided with a slit corresponding to the protrusion 40 and penetrating the resin sheet in the thickness direction at the boundary portion between the side wall portion 23 and the outer cover wall portion 25, and a slit corresponding to the protrusion 40 and penetrating the resin sheet in the thickness direction at the boundary portion between the side wall portion 23 and the bottom wall portion 21, so that the protrusions 40a to 40c can be formed at the 1 st edge portion 23-1 and the 2 nd edge portion 23-2.

Next, a sheath 71 for an electric wire according to embodiment 3 of the present invention will be described. The same components as those of the electric wire sheaths 11 and 61 of embodiments 1 and 2 will be described with the same reference numerals.

In the sheath 61 for electric wire according to embodiment 2, the projecting portions 40-1a to 40-1c provided in the 1 st edge portion 23-1 are disposed to face the projecting portions 40-2a to 40-2c provided in the 2 nd edge portion 23-2, respectively. Instead, as shown in fig. 4, in the sheath 71 for electric wires according to embodiment 3, the projecting portions 40-1a to 40-1b provided in the 1 st edge portion 23-1 are not disposed to face the projecting portion 40-2 provided in the 2 nd edge portion 23-2. In the sheath 71 for electric wire, the projection 40-2 is disposed between the projection 40-1a and the projection 40-1b provided in the 1 st edge portion 23-1. More specifically, in the sheath 71 for electric wire, the projections 40 are arranged in a staggered manner on the side wall portions 23 by arranging the projections 40-2 at or near the midpoint between the projections 40-1a and the projections 40-1 b.

In the sheath 71 for electric wires, the protruding portions 40 are arranged in a staggered manner, whereby the number of the protruding portions 40 to be provided, that is, the contact area between the sheath 71 for electric wires and the mounting object such as a vehicle can be further reduced to further suppress vibration noise, and the stability of fixing the sheath 71 for electric wires to the mounting object such as a vehicle can be improved.

Next, a sheath for an electric wire according to another embodiment of the present invention will be described. In the sheath for electric wires of the above embodiments, the shape of the projecting portion 40 in the projecting direction is a quadrangle, but alternatively, as shown in fig. 5(a), it may be a trapezoid (in fig. 5(a), the tip portion 41 of the projecting portion 40 is a trapezoid narrower than the base portion 42 of the projecting portion 40). By providing the trapezoidal shape, particularly the trapezoidal shape in which the distal end portion 41 of the protruding portion 40 is narrower than the base portion 42 of the protruding portion 40, the contact area between the sheath for electric wires and the mounting object can be further reduced, and therefore vibration noise can be further suppressed. Further, since the projecting portion 40 has the trapezoidal shape, a portion of the mounting object in contact with the distal end portion 41 of the projecting portion 40 can be prevented from being damaged.

As shown in fig. 5(b), the projecting direction of the projecting portion 40 may be a quadrangle in which at least a part of the corner portion is formed in a rounded shape. In fig. 5(b), the corner portion is formed in a rounded shape at the tip end portion 41 of the protruding portion 40. Since the corner portion is formed in the rounded shape at the distal end portion 41 of the protruding portion 40, the contact area between the sheath for electric wire and the object to be attached can be further reduced, and therefore, the vibration noise can be further suppressed. Further, by forming the corner portion of the distal end portion 41 of the protruding portion 40 in a rounded shape, it is possible to prevent damage from occurring to a portion where the attachment object contacts the distal end portion 41 of the protruding portion 40.

As shown in fig. 5(c), the shape of the protruding portion 40 in the protruding direction may be a trapezoid in which the tip portion 41 of the protruding portion 40 is narrower than the base portion 42 of the protruding portion 40. The shape of the protruding portion 40 in the protruding direction may be triangular, semicircular, or the like.

In the sheath for electric wires according to the above embodiments, the shape of the tip portion 41 of the protruding portion 40 is linear along the extending direction of the wire harness 2, that is, the longitudinal direction x of the sheath for electric wires, and instead, as shown in fig. 6, it may be processed into a corrugated shape in which curved concave portions 43 and curved convex portions 44 overlap. Since the distal end portion 41 of the protruding portion 40 is processed into a corrugated shape, the contact area between the sheath for electric wire and the object to be attached can be further reduced, and therefore, the vibration noise can be further suppressed. Further, since the distal end portion 41 of the protruding portion 40 is formed into a curved corrugated shape, a portion of the attachment object that contacts the distal end portion 41 of the protruding portion 40 can be prevented from being damaged.

In the sheath for electric wires of the above embodiments, the inner-side cover wall portion 24 is fixed to the side wall portion 23 by the locking piece 50 being locked to the through hole 51, and the plurality of wall portions 20 and the housing portion 31 are maintained in a predetermined shape, but the locking piece 50 may not be provided. That is, when the plurality of wall portions 20 are maintained in the predetermined shape, another method may be used instead of the method of locking the locking piece 50. Examples of other methods include a welding method such as ultrasonic welding or thermal welding, or a bonding method such as an adhesive or a tape.

Further, in the sheath for electric wire of each of the above embodiments, the projecting portion 40 is provided on the side wall portion 23 of the plurality of wall portions 20, but instead of the side wall portion 23, the projecting portion 40 may be provided on the side wall portion 22, the bottom wall portion 21, or the outer lid wall portion 25, or the projecting portions 40 may be provided on two or more wall portions of the side wall portion 23, the side wall portion 22, the bottom wall portion 21, and the outer lid wall portion 25. The projection 40 can be formed on the predetermined wall portion at the time of bending the resin sheet by forming the slit 40' penetrating the resin sheet in the thickness direction in the predetermined one of the bent portions 200a to 200 d.

In the sheath for electric wires of the above embodiments, the cross-sectional shape in the width direction y of the plurality of wall portions 20 is a quadrangle, but the shape in the width direction y may be appropriately selected depending on the use conditions of the sheath for electric wires, and may be, for example, a triangle, a pentagon, or a polygon having more than two sides. In the sheath for electric wire of each of the above embodiments, the shape in the longitudinal direction x is linear, but the shape in the longitudinal direction x may be appropriately selected according to the wiring state of the wire harness, and may be, for example, a shape having a bent portion, a shape having a linear portion and a bent portion, a shape having a branched portion, or the like.

Industrial applicability of the invention

In the present invention, since the contact area between the sheath for electric wire and the mounting object is reduced and the vibration sound generated by the vibration of the sheath and the wire harness in the sheath due to the vibration of the mounting object can be reduced, the present invention has a high utility value in the field of wire harness sheaths for wiring in automobiles, for example.

Description of the reference numerals

1a wire harness having a sheath; 11. 61, 71 sheaths for electric wires; 20 wall portions; 31 a receiving part; 40 projection.