Power line

Abstract

To provide a power line which can be fixed to a wiring route with a small number of jigs.SOLUTION: The power line of the present invention is a power line used in an electronic device. Since the cross-sectional structure includes a metal core wire, a metal wire layer having a plurality of strands, and a sheath layer in order from the center, and the metal wire layer is a layer in which a strand thinner than the metal core wire is disposed on the outer periphery of the metal core wire, it is possible to provide a power wire capable of maintaining the shape by the power wire itself, absorbing vibration, and being fixed to a routing path with a small number of fixtures.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power line, and more particularly to a power line suitable for electronic devices to which vibrations are applied, such as in vehicles. [Background technology]

[0002] In vehicle electronic devices, power lines that transmit power and electrical signals are covered with a sheath to prevent breakage or short circuits due to interference with surrounding components caused by vibration.

[0003] Patent Document 1 describes a power line having an electric wire covered with an insulator, an outer sheath portion covering the outer periphery of the electric wire, and an intermediate portion interposed between the electric wire and the outer sheath portion, and discloses that the bending radius of this power line is restricted by integrating multiple convex portions formed on the intermediate portion with concave portions formed on the outer sheath portion in a fitted state, thereby enabling the power line to exhibit durability even when bent. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-139197 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the device described in Patent Document 1, the power line can be freely deformed within the regulated bending radius range, so the power line must be fixed in place to prevent interference with peripheral devices due to vibration, which requires fixing devices such as brackets or exterior materials to fix the power line to the wiring route.

[0006] The present invention has been made in view of the problems inherent in the prior art, and has as its object to provide a power line that can be laid out using fewer fixing devices. [Means for solving the problem]

[0007] As a result of extensive research into achieving the above-mentioned object, the inventor discovered that the above-mentioned object can be achieved by providing a thick metal core wire and arranging a plurality of wires thinner than the metal core wire around the outer periphery of the core wire so that they can slide against the metal core wire, thereby completing the present invention.

[0008] That is, the power line of the present invention is a power line used in electronic devices. The cable has a cross-sectional structure having, in order from the center, a metal core wire, a metal wire layer having a plurality of wires, and a sheath layer, and is characterized in that the metal wire layer is a layer in which wires thinner than the metal core wire are arranged on the outer periphery of the metal core wire. [Effects of the Invention]

[0009] According to the present invention, a plurality of wires thinner than a thick metal core wire are arranged around the outer periphery of the thick metal core wire, which enables the power line itself to maintain its shape and absorb vibrations, and makes it possible to provide a power line that can be fixed to a wiring route with fewer fixing devices. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a power line according to the present invention; [Figure 2] 1 is a diagram showing an example of a state in which power lines according to the present invention are laid out; DETAILED DESCRIPTION OF THE INVENTION

[0011] The power line of the present invention will now be described in detail. The power line of the present invention has a cross-sectional structure having, in order from the center, a metal core wire 1, a metal wire layer 2, and a sheath layer 3.

[0012] The metal core wire 1 is formed of a thick single wire as shown in Figure 1, and the metal wire layer 2 is formed by arranging a plurality of wires 21 that are thinner than the metal core wire 1 on the outer periphery of the metal core wire 1.

[0013] The power line of the present invention has a thick metal core wire 1 with high bending rigidity. Therefore, by molding the power line to fit the shape of the wiring route, the power line can maintain its shape along the wiring route and can suppress the power line's oscillation due to vibration by itself, making it possible to reduce or omit fixing devices such as brackets for fixing the power line to the wiring route.

[0014] In addition, the metal wire layer 2 is formed of wires 21 that are thinner than the metal core wire 1, and is flexible, so it has excellent bending resistance and can absorb vibrations input to the power line, suppressing micro-sliding caused by vibrations at the fixed points (terminals) that electrically connect to electronic components.

[0015] Furthermore, since the multiple wires 21 are arranged on the outer periphery of the metal core wire 1, even if tensile stress is applied to the power line, the metal core wire 1 resists the tensile stress and the tensile stress is distributed to the multiple wires 21, preventing excessive tensile stress from being applied to only some of the wires 21 and preventing breakage.

[0016] Furthermore, if there is a gap between adjacent wires 21 arranged around the outer periphery of the metal core wire 1, when the power line is bent, the wire 21 located on the outside can shift to the inside of the bend, thereby alleviating the tensile stress acting on the wire 21 on the outside of the bend and preventing breakage.

[0017] Depending on the magnitude of the input vibration, each of the wires 21 constituting the metal wire layer 2 may be coated and insulated from the metal core wire 1, or may be uncoated and conductive. However, by being insulated, an increase in contact resistance between the wires and the metal core wire 1 due to vibration input can be prevented.

[0018] The material for forming the metal core wire 1 can be aluminum. Copper is generally used for the conductor of power lines, but aluminum is more easily deformed than copper, so by partially plastically deforming the metal core wire 1 in the longitudinal direction, it is easy to shape the power line into the shape of the wiring route, as shown in Figure 2.

[0019] The thickness of the metal core wire 1 may be any thickness that can suppress the vibration of the power line when vibration is input, and is preferably 3 mm to 5 mm, although it depends on the input vibration.

[0020] When the diameter of the metal core wire 1 is within the above range, it is possible to achieve both ease of molding to match the shape of the wiring route and suppression of vibration of the power line due to vibration.

[0021] The wires 21 may be made of copper or aluminum, but copper is preferable in terms of electrical conductivity.

[0022] The thickness of the wire 21 may be any thickness as long as it has bending resistance, and although it depends on the current that flows, it is preferably 0.5 mm to 1 mm, which allows a current of several amperes to several tens of amperes to flow.

[0023] The sheath layer 3 covers the outside of the metal wire layer 2 to protect the metal core wire 1 and the wires 21 of the metal wire layer 2. This sheath layer 3 may be formed only from an insulator, but as shown in Figure 1, it has, from the inside, an inner sheath layer 31, a shielding layer, and an outer sheath layer 32, and by having an internal shielding layer made of metal foil such as aluminum, it is possible to prevent radiation noise.

[0024] The elongation of the outer sheath layer 32 is preferably equal to or greater than the elongation of the inner sheath layer 31 . Generally, the outer sheath layer 32, which is the outermost layer of the power line, is made of a hard material so as not to be damaged even if it interferes with other components due to vibration, and is therefore difficult to stretch.

[0025] As described above, the power line of the present invention has the metal core wire 1 which suppresses swinging due to vibration and prevents interference with other components, so that a soft material with high elongation can be used for the sheath layer. Since the elongation of the outer sheath layer 32 is the same as or greater than that of the inner sheath layer 31, the outer sheath layer 32 can follow the shape of the metal wire layer 2, improving the formability of the power line.

[0026] In the present invention, a large elongation means that the elastic modulus is small within the range of elastic deformation, and the elongation up to breakage is large in the range exceeding the yield point.

[0027] Furthermore, the thickness of the outer sheath layer 32 is preferably thinner than the thickness of the inner sheath layer 31 . The inner sheath layer 31 needs to have a certain thickness to insulate the metal core wire 1 and the wires 21, but the power line of the present invention maintains its routing shape and prevents interference with other components, so the thickness of the outer sheath layer 32 can be made thinner than the thickness of the inner sheath layer 31, resulting in weight reduction and cost reduction.

[0028] The inner sheath layer and the outer sheath layer may be made of natural rubber, chloroprene rubber (neoprene), vinyl, or the like.

[0029] As described above, the power line of the present invention suppresses oscillation even when vibration is input, and therefore can be lightened by routing the power line without using brackets. Furthermore, the weight can be reduced by thinning not only the metal core wire but also the sheath layer, making the power line suitable for use in vehicle chargers, etc. [Explanation of symbols]

[0030] 1 Metal core wire 2 Metal wire layer 21 Wire 3 Sheath layer 31 Inner sheath layer 32 Shielding layer 33 Outer sheath layer 4 Fixed point (terminal) 5. Cabinet 10 Power Lines

Claims

1. A power line used in an electronic device, The cable has a cross-sectional structure including, in order from the center, a metal core wire, a metal wire layer having a plurality of wires, and a sheath layer, The power line is characterized in that the metal wire layer is a layer in which wires thinner than the metal core wire are arranged on the outer periphery of the metal core wire.

2. 2. The power line according to claim 1, wherein the metal core wire is made of aluminum.

3. 3. The power line according to claim 2, wherein the metal core wire is formed by partially plastically deforming in the longitudinal direction thereof.

4. 3. The power line according to claim 2, wherein the sheath layer comprises, in order from the inside, an inner sheath layer, a shield layer, and an outer sheath layer.

5. 5. The power line according to claim 4, wherein the elongation of the outer sheath layer is equal to or greater than the elongation of the inner sheath layer.

6. 6. The power line according to claim 5, wherein the thickness of the outer sheath layer is thinner than the thickness of the inner sheath layer.

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