Wiring structure

Abstract

To provide a wiring structure capable of preventing the generation of a radio noise.SOLUTION: A wiring structure comprises: two electric / electron components that are mounted onto a vehicle, and include a shield case connected to a chassis ground, respectively; and a shield wire having a center conductor and an external conductor coating the center conductor from an outer periphery. Both end parts of the shield wire are extended to each of two shield cases, at least one shield case of the two shield cases includes an insulation part, and the outer conductor in one end part of the shield wire extended to one shield case is connected to the insulation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to wiring structures. [Background technology]

[0002] Electrical and electronic components installed in automobiles are prone to generating noise.

[0003] For example, if one of two components installed in an automobile is a source of noise, the one component can be connected to the other component via a shielded wire and the other component can be grounded to the chassis, so that the noise can be dropped to ground via the shielded wire and the other component.

[0004] As a technique for removing noise, for example, a filter circuit for removing noise provided in a wiring path for supplying DC power to a power device is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-069247 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in an electric vehicle such as an electric car, when two components are connected to each other via a high-voltage harness, each component is chassis grounded, forming a ground loop in which a current from a noise source returns to the noise source through the chassis ground. This generates radio noise (common mode noise). As a result, there is a problem that EMC resistance is deteriorated.

[0007] An object of the present disclosure is to provide a wiring structure capable of preventing the generation of radio noise. [Means for solving the problem]

[0008] In order to achieve the above object, the wiring structure in the present disclosure comprises: A noise generating source which is an electric / electronic component mounted on a vehicle and has a shielded case connected to a chassis ground; An electric motor, which is an electric / electronic component mounted on a vehicle and has a shield case connected to the chassis ground; a shielded wire having a central conductor and an outer conductor covering the central conductor from an outer periphery; Equipped with both ends of the shielded wire are extended to a shield case of the noise generation source and a shield case of the electric motor, the outer conductor at one end of the shielded wire is connected to a shield case of the noise generation source and to a ground terminal of the noise generation source, a shield case of the electric motor having an insulating portion, a terminal of the electric motor is connected to the central conductor at the other end of the shielded wire; The other terminal of the electric motor is The insulating portion is connected to a shield case of the electric motor via the insulating portion. Connected R, The outer conductor at the other end of the shielded wire extends toward the insulating portion and is connected to a shield case of the electric motor via the insulating portion. Effect of the Invention

[0009] According to the present disclosure, it is possible to prevent the generation of radio noise. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a diagram showing an example of a wiring structure according to an embodiment of the present disclosure. [Diagram 2] FIG. 13 is a diagram showing an example of a wiring structure in a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. An example of a wiring structure in the embodiment of the present disclosure will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of a wiring structure in the embodiment of the present disclosure. The automobile in the embodiment of the present disclosure is an electric vehicle (EV) that runs using an electric motor as a power source. For simplicity of explanation, the following description will be given of a case in which two electric / electronic components are mounted on the EV.

[0012] An EV is equipped with a component 1, a component 2, and a component 3. In this embodiment, the component 1 is a battery. Power from the component 1 (battery) is supplied to the component 3 via the component 2. The component 2 is a noise source NS (signal source). Here, the noise source NS is, for example, a switch element.

[0013] A shielded wire 4 extends between the component 1 (battery) and the component 2. The shielded wire 4 has a central conductor 4a and an outer conductor 4b that covers the outer periphery of the central conductor 4a.

[0014] A shielded wire 5 extends between the component 2 and the component 3. The shielded wire 5 has a central conductor 5a and an outer conductor 5b that covers the outer periphery of the central conductor 5a.

[0015] (Component 1) The component 1 has a shield case 11 connected to a chassis ground SG. A battery pack 12 is provided inside the shield case 11. A positive terminal of the battery pack 12 is connected to one end of the central conductor 4a. A negative terminal of the battery pack 12 is connected to the insulating part 6. In other words, the negative terminal of the battery pack 12 is indirectly connected to one end of the outer conductor 4b via the insulating part 6.

[0016] (Component 2) The component 2 has a shielding case 21 connected to the chassis ground SG. As described above, the noise source NS is present inside the shielding case 21. An input terminal of the noise source NS is connected to the other end of the central conductor 4a. A ground terminal of the noise source NS is connected to the other end of the outer conductor 4b.

[0017] An output terminal of the noise source NS is connected to one end of the central conductor 5a, and a ground terminal of the noise source NS is connected to one end of the outer conductor 5b.

[0018] (Component 3) The component 3 has a shield case 31 connected to a chassis ground SG. Inside the shield case 31, a load 32 to which power is supplied from the component 1 (battery) is provided. Here, the load 32 is, for example, an electric motor. One terminal of the load 32 is connected to the other end of the central conductor 5a. The other end of the load 32 is connected to the insulating part 7. In other words, the other end of the load 32 is indirectly connected to the other end of the outer conductor 5b via the insulating part 7.

[0019] (Ground of wiring structure) According to the wiring structure composed of the component 1, the component 2, and the shielded wire 4, the ground side terminal of the noise source NS is connected to the other end of the external conductor 4b. However, the negative terminal of the battery pack 12 is not connected to one end of the external conductor 4b. As a result, the current from the noise source NS does not flow from the negative terminal of the battery pack 12 to the chassis ground SG, and does not return to the noise source NS through the chassis ground SG, so that a ground loop GL1 is not formed. In other words, a single-point earth is formed. As a result, it is possible to prevent the generation of radio noise. In FIG. 1, the fact that the ground loop GL1 is not formed is indicated by an "X". Also, in FIG. 1, the fact that the generation of radio noise is prevented is indicated by an "X".

[0020] According to the wiring structure composed of the component 2, the component 3, and the shielded wire 5, the ground side terminal of the noise source NS is connected to one end of the external conductor 5b. However, the other end of the load 32 is not connected to the other end of the external conductor 5b. As a result, the current from the noise source NS does not flow from the other end of the load 32 to the chassis ground SG, and does not return to the noise source NS through the chassis ground SG, so that a ground loop GL2 is not formed. In other words, a single-point earth is formed. As a result, it is possible to prevent the generation of radio noise. In FIG. 1, the absence of the ground loop GL2 is indicated by an "X". Also, in FIG. 1, the prevention of the generation of radio noise is indicated by an "X".

[0021] (Wiring structure in comparative example) Next, an example of a wiring structure in a comparative example will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of a wiring structure in a comparative example. In the description of the wiring structure in the comparative example, configurations different from the wiring structure in the present embodiment will be mainly described, and the same configurations will be denoted by the same reference numerals and descriptions thereof will be omitted.

[0022] (Component 2) In this embodiment, the negative terminal of the battery pack 12 is indirectly connected to one end of the external conductor 4b via the insulating part 6. In contrast, in the comparative example, the negative terminal of the battery pack 12 is directly connected to one end of the external conductor 4b.

[0023] (Component 3) In this embodiment, the other end of the load 32 is indirectly connected to the other end of the outer conductor 5b via the insulating portion .

[0024] In contrast to this, in the comparative example, the other end of the load 32 is directly connected to the other end of the outer conductor 5b.

[0025] (Ground of the wiring structure in the comparative example) According to the wiring structure consisting of the component 1 (battery), the component 2, and the shielded wire 4, the ground side terminal of the noise source NS is connected to the other end of the external conductor 4b. Also, the negative terminal of the battery pack 12 is connected to one end of the external conductor 4b. As a result, the current from the noise source NS flows from the negative terminal of the battery pack 12 to the chassis ground SG, and returns to the noise source NS through the chassis ground SG, forming a ground loop GL1. As a result, it is not possible to prevent the generation of radio noise.

[0026] According to the wiring structure formed by the component 2, the component 3, and the shielded wire 5, the ground side terminal of the noise source NS is connected to one end of the external conductor 5b. The other end of the load 32 is connected to the other end of the external conductor 5b. As a result, the current from the noise source NS flows from the other end of the load 32 to the chassis ground SG and returns to the noise source NS through the chassis ground SG, forming a ground loop GL2. As a result, it is not possible to prevent the generation of radio noise.

[0027] The wiring structure in this embodiment includes two electric / electronic components 2, 3 mounted on a vehicle and each having a shielding case 21, 31 connected to the chassis ground SG, and a shielded wire 5 having a central conductor 5a and an outer conductor 5b covering the central conductor 5a from its outer periphery, with both ends of the shielded wire 5 extending into each of the two shielding cases 21, 31, and at least one of the two shielding cases 21, 31 having an insulating portion 7, and the outer conductor 5b at one end of the shielded wire 5 extended into one of the shielding cases is connected to the insulating portion 7.

[0028] According to the above configuration, when the component 2 has a noise source NS and the component 3 has a load 32, the current from the noise source NS does not flow from the other end of the load 32 to the chassis ground SG, and does not return to the noise source NS through the chassis ground SG, so that a ground loop GL2 is not formed. This makes it possible to prevent the generation of radio noise.

[0029] Moreover, in the wiring structure of the present embodiment, the insulating section 7 has a painted section that is insulatingly painted on the shielding case 31. This allows the insulating section 7 and the shielding case 31 to be integrated together, making it possible to reduce manufacturing costs and assembly costs.

[0030] In addition, the above-mentioned embodiments are merely examples of the embodiment of the present disclosure, and the technical scope of the present disclosure should not be interpreted as being limited by them. In other words, the present disclosure can be embodied in various forms without departing from the gist or main features thereof. [Industrial Applicability]

[0031] The present disclosure is suitably used in electric vehicles equipped with a wiring structure that is required to prevent the generation of radio noise. [Explanation of symbols]

[0032] 1. Components 2. Components 3. Components 4 Shielded wire 4a Center conductor 4b Outer conductor 5 Shielded wire 5a central conductor 5b Outer conductor 6 Insulation 7 Insulation 11 Shielding case 12 Battery pack 21 Shielding case 31 Shielding case 32 Load

Claims

1. A noise generating source which is an electric / electronic component mounted on a vehicle and has a shield case connected to a chassis ground; An electric motor, which is an electric / electronic component mounted on a vehicle and has a shield case connected to the chassis ground; a shielded wire having a central conductor and an outer conductor covering the central conductor from an outer periphery; Equipped with both ends of the shielded wire are extended to a shield case of the noise generation source and a shield case of the electric motor, the outer conductor at one end of the shielded wire is connected to a shield case of the noise generation source and to a ground terminal of the noise generation source, a shield case of the electric motor having an insulating portion, a terminal of the electric motor is connected to the central conductor at the other end of the shielded wire; the other terminal of the electric motor extends toward the insulating portion and is connected to a shield case of the electric motor via the insulating portion; the outer conductor at the other end of the shielded wire extends toward the insulating portion and is connected to a shield case of the electric motor via the insulating portion. Wiring structure.

2. The insulating portion has a coating portion that is coated with an insulating coating on the shield case. The wiring structure according to claim 1 .

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