JP2019146290A - Wire protective tube for wire harness, and wire harness - Google Patents

Abstract

To provide a wire protective tube for a wire harness capable of improving the degree of freedom of a bending angle of a branch cylinder part in spite of being made of a hard resin, and capable of surely protecting a branch portion of a wire harness.SOLUTION: The present invention relates to a wire protective tube 10 for a wire harness wherein a tube body 11 which is made of a hard resin and covers an outer periphery of a trunk wire Wa of a wire harness W and a branch cylinder part 12 which is branched from the tube body 11 and covers an outer periphery of a branch wire Wb branched from the trunk wire Wa of the wire harness W are integrally provided. A bellows-like flexible part 14 which bends the branch cylinder part 12 elastically in a three-dimensional direction from a proximal end 12a of the branch cylinder part 12 to the side of an opening end 12c in an entire circumferential direction is integrally formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric wire protection tube and a wire harness for a wire harness that protects a trunk line and a branch line of the wire harness.

  There exists what was disclosed by patent document 1 as an electric wire protection tube for this kind of wire harness. As shown in FIGS. 7A to 7C, the electric wire protection tube 1 is made of resin, and has a bellows shape covering the outer periphery of the main line Wa of the wire harness W, and the wire harness W. A cylindrical branch tube portion 3 that covers the outer periphery of the branch line Wb branched from the trunk line Wa is provided integrally.

  The wall between the base end 3a and the opening end 3b of the cylindrical branch tube portion 3 of the electric wire protection tube 1 is a bendable portion 4 that can be bent. Then, as shown in FIG. 7C, when the branch line Wb comes into contact with the edge 3c of the open end 3b of the branch tube part 3, the bendable part 4 is reduced so as to reduce the force with which the edge 3c presses the branch line Wb. Is elastically bent.

Japanese Unexamined Patent Publication No. 2016-19344 JP 2009-240062 JP

  However, in the conventional electric wire protection tube 1, in order to bend the bendable part 4 elastically in order to reduce the force with which the edge 3c presses the branch line Wb, the electric wire protection tube 1 is, for example, a tensile elastic modulus of 800 MPa or less. In this case, it is difficult to protect the wire harness W from strong interference caused by metal burrs or the like unless the thickness of the branch tube portion 3 is increased. When the wall thickness of 3 is increased, the application location is limited due to an increase in weight or route restrictions. Furthermore, when the electric wire protection tube 1 is formed of a hard resin, it is difficult to elastically bend the bendable portion 4, and the branch direction of the branch line Wb is limited to one direction.

  Therefore, the present invention has been made to solve the above-mentioned problems, and even if it is made of hard resin, the degree of freedom of the bending (branching) angle of the branch tube portion can be improved, and the branch portion of the wire harness can be surely secured. An object is to provide an electric wire protection tube and a wire harness for a wire harness that can be protected.

  The present invention is an electric wire protection tube for a wire harness that protects the wire harness, which is made of a quality resin and covers the outer periphery of the main line of the wire harness, and is branched from the tube main body from the main line of the wire harness. A gist is that a branch cylinder part that covers the outer periphery of the branch line that branches is provided integrally, and a bellows-like flexible part is provided at least in a portion of the branch cylinder part that is elastically bent.

  According to the present invention, even a single part made of hard resin can improve the degree of freedom of the bending angle of the branch tube portion, and can reliably protect the branch portion of the wire harness.

It is a top view which shows the electric wire protection tube for wire harnesses of 1st Embodiment of this invention. It is a top view which shows the state which bent the branch cylinder part of the said electric wire protection tube in one direction. It is a top view which shows the state which bent the branched cylinder part of the said electric wire protection tube in the direction of the other side opposite. It is a top view which shows the electric wire protection tube for wire harnesses of 2nd Embodiment of this invention. It is a top view which shows the state which folded the bellows-like flexible part of the branch cylinder part of the electric wire protection tube of the said 2nd Embodiment. It is a top view which shows the electric wire protection tube for wire harnesses of 3rd Embodiment of this invention. (A) is a top view which shows the electric wire protection tube for the conventional wire harness, (b) is sectional drawing of the electric wire protection tube, (c) is sectional drawing of the branch cylinder part periphery of the electric wire protection tube.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing an electric wire protection tube for a wire harness according to a first embodiment of the present invention, FIG. 2 is a plan view showing a state where a branched tube portion of the electric wire protection tube is bent in one direction, and FIG. It is a top view which shows the state which bent the branch cylinder part of the electric wire protection tube in the direction of the other side opposite.

  As shown in FIGS. 1 to 3, the wire protection tube 10 for a wire harness is formed by direct blow molding or the like of a hard resin (for example, a tensile elastic modulus of 800 MPa to 2000 MPa) and covers the outer periphery of the trunk line Wa of the wire harness W. A cylindrical tube body 11 and a cylindrical branch cylinder portion 12 that branches from the tube body 11 and covers the outer periphery of the branch line Wb that branches from the trunk line Wa of the wire harness W are integrally provided.

  As shown in FIG. 1, a bellows-like flexible portion 14 that elastically bends the branch cylindrical portion 12 in a three-dimensional direction from the base end 12 a to the opening end 12 c side of the branch cylindrical portion 12 is integrally formed. It is. The bellows-like flexible portion 14 is provided with a plurality of peaks 14 a and valleys 14 b alternately along the axial direction, and is provided with a degree of freedom of expansion and contraction. 12 is elastically tilted in a three-dimensional direction. That is, as shown in FIGS. 2 and 3, the electric wire protection tube 10 is formed of a hard resin by integrally forming the bellows-like flexible portion 14 from the base end 12a of the branch tube portion 12 to the opening end 12c side. Even in the case of a single component, the branching cylinder part 12 can be three-dimensionally changed in the branching (bending) angle via the bellows-like flexible part 14, and the degree of freedom in the branching direction is ensured. In addition, a protection function against strong external interference due to metal burrs or the like can be secured. In addition, the code | symbol 12b in a figure shows the part which has not formed the bellows-shaped flexible part 14 in the branch cylinder part 12. FIG.

  The wire harness W includes a main line Wa in which a plurality of electric wires are bundled and a branch line Wb obtained by branching a part of the electric wires constituting the main line Wa from the main line WAa. The main line Wa is a tube of the electric wire protection tube 10. It is armored by the main body 11, and the branch line Wb is armored by the branch cylinder part 12 branched from the tube main body 11 and exposed to the outside from the opening end 12 c.

  As described above, according to the wire protection tube 10 for the wire harness of the first embodiment, the branch cylinder portion 12 branched from the tube body 11 can be bent in the three-dimensional direction via the bellows-like flexible portion 14, and the branch thereof. The degree of freedom in the direction can be improved, and the branch portion of the wire harness W can be reliably protected.

  That is, the bellows-like flexible part 14 is integrally formed in the entire circumferential direction from the base end 12a of the branching cylinder part 12 to the opening end 12c, so that the branching cylinder part 12 is three-dimensionally formed by the bellows-like flexible part 14. By making it possible to change the branching angle, it is possible to achieve coexistence with a protective function against strong external interference caused by metal burrs or the like with a single component. In addition, it is not necessary to set a part number with a different branching direction, which can lead to a reduction in mold costs and generalization.

  FIG. 4 is a plan view showing an electric wire protection tube for a wire harness according to a second embodiment of the present invention, and FIG. 5 is a plan view showing a state in which a bellows-like flexible portion of a branch tube portion of the electric wire protection tube is folded. .

  The electric wire protection tube 10 'for the wire harness according to the second embodiment has a base end 13a except for a part of the base end 13a of the branch tube portion 13 (the left end side of the base end 13a indicated by symbol A in FIG. 4). A difference from the first embodiment is that a bellows-like flexible portion 14 is integrally formed in the circumferential direction from the opening end 13c toward the opening end 13c to bend the branch tube portion 13 in one direction by changing the branch angle. As in the first embodiment, the branch line Wb branched from the trunk line WAa of the wire harness W is exposed to the outside from the opening end 13c of the branch cylinder part 13 formed integrally with the tube body 11. Yes. Moreover, the code | symbol 13b in a figure shows the part which has not formed the bellows-shaped flexible part 14 in the branch cylinder part 13. FIG.

  In the electric wire protection tube 10 ′ for the wire harness according to the second embodiment, by providing a portion where the bellows-like flexible portion 14 is not provided at a part of the base end 13 a of the branch tube portion 13, The direction of bending can be regulated. That is, as shown in FIG. 5, the bellows-like flexible portion 14 integrally formed from a part of the base end 13 a of the branch tube portion 13 to the opening end 13 c can be folded. The branch cylinder part 13 cannot be bent in the opposite direction. Further, the maximum angle at which the branched tube portion 13 bends can be set by the shapes of the plurality of peak portions 14a and valley portions 14b formed alternately in the bellows-like flexible portion 14.

  FIG. 6 is a plan view showing an electric wire protection tube for a wire harness according to a third embodiment of the present invention.

  In the electric wire protection tube 10 ″ for a wire harness according to the third embodiment, two branch tube portions 12 and 13 are integrally formed on the tube body 11. The one branch tube portion 12 includes the first tube tube 12 ″. Similarly to the embodiment, a bellows-like flexible portion 14 that elastically bends the branch cylindrical portion 12 in the three-dimensional direction from the base end 12a to the opening end 12c side is formed integrally. The same operations and effects as in the first embodiment are exhibited.

  Further, as in the second embodiment, the other branch tube portion 13 is branched in the circumferential direction from the base end 13a to the opening end 13c side except for a part of the base end 13a of the branch tube portion 13. A bellows-like flexible portion 14 that bends the tube portion 13 in one direction by changing its branch angle is integrally formed, and the same operations and effects as those of the second embodiment are achieved.

  In addition, if the tube body covering the outer periphery of the main line has a bellows shape, as a wire harness, when securing linearity, a new shape holding member is required, but by having a straight shape without bellows, A member for newly retaining the shape becomes unnecessary.

  Moreover, according to each said embodiment, although the tube main body and the branch cylinder part were integrally formed in the cylindrical shape, the lit for attachment was put in the center of a cylindrical tube main body and a branch cylinder part along a longitudinal direction, respectively. You may make it easy to mount | wear with a wire harness by forming in half shape. In this case, after the wire harness is mounted, a lock structure may be provided to lock the mounted state.

10, 10 ', 10 "Electric wire protection tube 11 Tube body 12 Branch tube portion 12a Base end 12c Open end 13 Branch tube portion 13a Base end 13c Open end 14 Bellows-shaped flexible portion W Wire harness Wa Trunk line Wb Branch line

Claims (5)

A tube body made of hard resin and covering the outer periphery of the trunk of the wire harness,
A branch cylinder portion that branches from the tube main body and covers the outer periphery of the branch line that branches from the trunk of the wire harness is integrally provided,
An electric wire protection tube for a wire harness, wherein a bellows-like flexible portion is provided at least in a portion of the branch tube portion in a direction in which it is elastically bent. It is an electric wire protection tube for wire harnesses according to claim 1,
The said bellows-like flexible part is provided in the whole circumferential direction of this branch cylinder part from the base end of the said branch cylinder part to the opening end side, The electric wire protection tube for wire harnesses characterized by the above-mentioned. It is an electric wire protection tube for wire harnesses according to claim 1,
The bellows-like flexible part is provided in the circumferential direction of the branch cylinder part from the base end to the opening end side except for a part of the base end of the branch cylinder part. Wire protection tube. It is an electric wire protection tube for wire harnesses given in any 1 paragraph of Claims 1-3,
An electric wire protection tube for a wire harness, wherein the tube main body is provided with a plurality of the branch tube portions.   A branch having a bellows-like flexible part at least in a direction in which a trunk line is covered with a hard resin tube body and a branch line branched from the trunk line is integrally branched from the tube body and bent at least elastically A wire harness characterized by being covered with a cylindrical portion.

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