Covered wire and automobile-use wire harness
A technology of covered wires and wire harnesses, which is applied in the field of wire harnesses for motor vehicles, and can solve problems such as short-circuit accidents, excessive electromagnetic induction noise, and exceeding the allowable temperature of conductors
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Embodiment 1
[0063] Covered wires with different specific magnetic permeability were manufactured separately, and a wire bundle of a plurality of such wires was arranged near an AC power cable, and the temperature change of the wires when an AC current was passed through the cable was tested.
[0064]In the conductor part used in the test, one second wire bundle was used as the center line, eight first wire bundles were used as the outer circumference wire, and they were twisted to form a nine-wire twisted structure. A copper wire having a wire diameter of φ0.140 mm made of ductile copper (C1100) was used for each first wire harness. The second wire harness uses stainless steel wire with a wire diameter of φ0.225mm, and the specific magnetic permeability is made different by changing the total processing area reduction rate. Specifically, in sample No. A having a specific magnetic permeability of 2.0, stainless steel made of SUS304 was used, and wire drawing was performed with a total redu...
Embodiment 2
[0069] The conductor part and the terminal part were manufactured from the metal material shown in Table 1, and the covered wire which attached the terminal part to the end part of the conductor part was manufactured. Then, after the salt spray test was performed on the obtained covered wire under the conditions shown in Table 2, the reduction rate of the fixing force of the terminal part was investigated, and the corrosion resistance was evaluated. The test results are shown in Table 3.
[0070] The conductor portion is produced by twisting a total of seven wire bundles including three first wire bundles and four second wire bundles. Both the wire diameters of the first wire harness and the second wire bundle are φ0.16 mm. Furthermore, after twisting, an insulating layer (thickness: 0.2 mm) made of vinyl chloride was provided on the outer periphery thereof. The terminal portion is formed in a general connector shape of a harness for automobiles.
[0071] Then, the differen...
Embodiment 3
[0084] The same stainless steel as the second wire harness used as the sample No. 1-2 of the above-mentioned Example 2 was prepared, and the specific magnetic permeability of the stainless steel was tried to be changed. This example shows the case where the specific magnetic permeability is changed by changing the total reduction of area during wire drawing within the range of 0 to 70% ( image 3 ); changing the specific magnetic permeability by changing the heating temperature in the softening treatment after wire drawing (total reduction of area: 70%) in the range of 900 to 1150°C ( Figure 4 ). In the softening treatment, the holding time of the heating temperature was 3 seconds at any temperature.
[0085] The result is, as image 3 As shown, it is known that the specific magnetic permeability μ can be changed by changing the reduction of area during wire drawing. In particular, it was found that the specific magnetic permeability μ was 1.1 or less when the total machin...
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Abstract
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