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JP-7854864-B2 - Exterior forming plate material, exterior, and wire harness with exterior

JP7854864B2JP 7854864 B2JP7854864 B2JP 7854864B2JP-7854864-B2

Inventors

  • 須山 博史
  • 押野 貴志
  • 児島 直之

Assignees

  • 古河電気工業株式会社
  • 古河ＡＳ株式会社

Dates

Publication Date
20260507
Application Date
20220613

Claims (9)

  1. A plate material for forming an exterior body, made of a plastically deformable resin material, The aforementioned plate material has a first recess and a second recess at opposing positions on both sides corresponding to the bent portion of the exterior body, The cross-sectional shapes of the first recess and the second recess are formed by arcs having curvatures such that a pair of recess opening end portions and recess bottom portions are convex in opposite directions, and the overall shape is a smooth curve. When the plate material is bent to form the bent portion of the exterior body, the bend angle of the recess located on the side that is bent inward among the first recess and the second recess is restricted by the fact that the open ends of the recesses come into contact with each other, and when the bottom portion of the recess is further bent while the bend angle is restricted, the open end portion of the recess is crushed and the bottom portion of the recess is plastically deformed by bending, the plate material for forming the exterior body.
  2. The exterior forming plate material according to claim 1, wherein, when the thickness of the plate material is 100%, the minimum thickness of the thin portion of the plate material where the first recess and the second recess are located is in the range of 10% to 70%.
  3. The exterior forming plate material according to claim 1, wherein, when the thickness of the plate material is 100%, the maximum depth of the first recess is in the range of 25% to 85%.
  4. The exterior forming plate material according to claim 1, wherein, when the thickness of the plate material is 100%, the maximum depth of the second recess is in the range of 3% to 40%.
  5. The first recess and the second recess are such that, when the maximum depth of the first recess is 1.00, the maximum depth of the second recess is 0.04 or more and 1.00 or less, as described in claim 1.
  6. The plate material for forming an exterior body according to claim 1, wherein the radius of curvature of the opening end portion of the first recess is in the range of 0.3 mm to 1.5 mm, and the radius of curvature of the opening end portion of the second recess is in the range of 0.5 mm to 7.5 mm.
  7. A plate material for forming an exterior body according to any one of claims 1 to 6, formed by bending the plate material, An exterior body having a plurality of plate-like surfaces connected via the aforementioned bent portion.
  8. The aforementioned outer casing is an outer casing for electric wires, as described in claim 7.
  9. A wire harness with an outer casing, comprising the outer casing described in claim 7.

Description

This invention relates to a plate material for forming an exterior body, an exterior body using the same, and a wire harness with an exterior body. Wire harnesses routed in vehicles and other vehicles are protected from external forces by an outer sheath. Such sheaths should not deform due to the weight or vibration of the wire harness, nor should the internal components being protected be exposed. Therefore, it is desirable that the sheath possesses adequate strength. As an outer casing to protect such wire harnesses, for example, Patent Document 1 describes an outer casing for a wire harness with an outer casing (protector), which is made of a hollow plate material with a hollow structure formed between multiple plate-like portions. In this case, the outer casing is described as having easily foldable lines, such as perforations, formed along the bendable portion of the hollow plate material by a roller equipped with cutting blades or protrusions on its surface. International Publication No. 2015/016056 Figure 1 is a schematic front view showing the main parts of the exterior forming plate material, including the first recess and the second recess.Figure 2 is a schematic front view showing the main part of the exterior forming plate material, including the first recess and the second recess. Figure 2(a) shows the state before bending, Figure 2(b) shows the exterior forming plate material with one surface bent inward, and Figure 2(c) shows the exterior forming plate material with the other surface bent inward.Figure 3 is a schematic perspective view showing the structure of a wire casing formed from sheet material for forming the casing.Figure 4 shows the exterior forming plate material of Example 2 of the present invention, observed in its state before bending, in a cross-section including the thickness direction, perpendicular to the direction in which the first recess and the second recess extend.Figure 5 is a schematic diagram showing the positional relationship between the center line and the first and second recesses when cutting out samples for tensile strength measurement from the exterior forming plate material of Examples 1 to 3 and Comparative Examples 1 and 2 of the present invention.Figure 6 is a graph showing the relationship between the minimum thickness t1 [mm] of the thin-walled portion and the tensile strength [N/ mm² ] for the plate material for forming the exterior body of the present invention examples 1 to 3 and comparative examples 1 and 2. The minimum thickness of the thin-walled portion is on the horizontal axis and the tensile strength is on the vertical axis.Figure 7 is a diagram illustrating a method for evaluating the bending strength of sheet materials used to form exterior components.Figure 8 is a graph showing the relationship between the minimum thickness t1 [mm] of the thin portion and the bending strength [N] for the plate material for forming the exterior body of the present invention examples 1 to 3 and comparative example 1, with the minimum thickness of the thin portion on the horizontal axis and the bending strength on the vertical axis.Figure 9 shows the plate material for forming the exterior body according to Example 2 of the present invention, after bending, observed in a cross-section that includes the thickness direction, perpendicular to the direction in which the first recess and the second recess extend. Next, several embodiments of the present invention, including the plate material for forming the exterior body and the exterior body itself, will be described below. 1. Regarding the plate material for forming the exterior body Figure 1 is a schematic front view showing the main part of the plate material 1 for forming the exterior body, including the first recess 21 and the second recess 31. Figure 2 is a schematic front view showing the main part of the plate material 1 for forming the exterior body, including the first recess 21 and the second recess 31. Figure 2(a) is the state before bending, Figure 2(b) is the state in which the plate material 1 for forming the exterior body is bent inward on one surface 2, and Figure 2(c) is the state in which the plate material 1 for forming the exterior body is bent inward on the other surface 3. Figure 3 is a schematic perspective view showing the structure of the wire exterior body 10 formed by the plate material 1 for forming the exterior body. Here, "front" refers to a cross section including the thickness direction, perpendicular to the direction in which the first recess 21 and the second recess 31 extend. As shown in Figure 1, the exterior forming plate material 1 is made of a plastically deformable resin material. It has a first recess 21 and a second recess 31 at opposing positions on both sides of the exterior's surfaces 2 and 3, corresponding to the bent portion. The cross-sectional shape of the first recess 21 is formed by an arc with a curvature where a pair of recess opening ends 22a and 22b and the re