Shielded cable

Abstract

The invention provides a shielded cable capable of suppressing damage to a shield when the shielded cable is bent. A shielded cable is provided with: a center conductor; an insulator disposed on the outer peripheral side of the center conductor; a first tape layer that is disposed on the outer peripheral side of the insulator and is composed of paper, a non-woven fabric, or a resin tape; a shield disposed on the outer peripheral side of the first tape layer; a second tape layer that is disposed on the outer peripheral side of the shield and is composed of paper, a nonwoven fabric, or a resin tape; and a sheath disposed on the outer peripheral side of the second tape layer.

Description

Technical Field

[0001] The present disclosure relates to a shielded cable. Background Art

[0002] Patent document 1 discloses a shielded cable. The shielded cable is, for example, a cable for an IWM (in-wheel motor). The shielded cable includes a center conductor, an insulator, a shield, and a sheath. The insulator is arranged on the outer peripheral side compared to the center conductor. The shield is arranged on the outer peripheral side compared to the insulator. The sheath is arranged on the outer peripheral side compared to the shield.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-65545 Summary of the invention

[0006] Problems to be solved by the invention

[0007] When a shielded cable is bent, the shielding material may be damaged. In one aspect of the present disclosure, it is preferable to provide a shielded cable capable of suppressing damage to the shielding material when the shielded cable is bent.

[0008] Solutions to Solve Problems

[0009] A shielded cable according to one aspect of the present invention comprises: a central conductor; an insulator, which is arranged on the outer peripheral side compared to the central conductor; a first tape layer, which is arranged on the outer peripheral side compared to the insulator and is composed of paper, non-woven fabric, or resin tape; a shielding member, which is arranged on the outer peripheral side compared to the first tape layer; a second tape layer, which is arranged on the outer peripheral side compared to the shielding member and is composed of paper, non-woven fabric, or resin tape; and a sheath, which is arranged on the outer peripheral side compared to the second tape layer.

[0010] A shielded cable according to one aspect of the present disclosure can suppress damage to a shield member when the shielded cable is bent.

[0011] A shielded cable according to another aspect of the present disclosure comprises: a plurality of twisted electric wires; a first tape layer, which is arranged on the outer peripheral side compared to the plurality of electric wires and is composed of paper, non-woven fabric, or resin tape; a shielding member, which is arranged on the outer peripheral side compared to the first tape layer; a second tape layer, which is arranged on the outer peripheral side compared to the shielding member and is composed of paper, non-woven fabric, or resin tape; and a sheath, which is arranged on the outer peripheral side compared to the second tape layer.

[0012] A shielded cable according to another aspect of the present disclosure can suppress damage to a shield member when the shielded cable is bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a top view showing the structure of a shielded cable.

[0014] Figure 2 yes Figure 1 Cross-sectional view at section II-II in FIG.

[0015] Figure 3 It is a cross-sectional view showing an orthogonal cross section of the shielded cable in the second embodiment.

[0016] Explanation of symbols

[0017] 1—shielded cable, 3—center conductor, 5—insulator, 7—shield, 9—jacket, 11—first tape layer, 13—second tape layer, 21, 23, 25—wires, 31—center conductor, 33—insulator. DETAILED DESCRIPTION

[0018] Embodiments of examples of the present disclosure are described with reference to the accompanying drawings.

[0019] <First embodiment>

[0020] 1. Structure of shielded cable 1

[0021] based on Figure 1 , Figure 2 The structure of the shielded cable 1 is described. Figure 1 As shown, the shielded cable 1 is a linear member. The shielded cable 1 is, for example, an IWM cable.

[0022] like Figure 2 As shown, the shielded cable 1 has a center conductor 3. The center conductor 3 is located at the center of the shielded cable 1 in a cross section perpendicular to the length direction of the shielded cable 1 (hereinafter referred to as an orthogonal cross section). The center conductor 3 is composed of a plurality of conductor wires. The conductor wires are composed of, for example, copper, copper alloy, etc. The conductor wires may also be tinned soft copper wires.

[0023] A plurality of conductor wires are twisted, for example. The twisting direction of the conductor wires is defined as follows. Figure 1 As shown in FIG. 1 , an imaginary point P is assumed on a conductor wire and the point P is moved along the length direction of the conductor wire.

[0024] At this time, in the length direction of the shielded cable 1, point P is Figure 1 Move in the X direction as shown. Figure 1 The viewpoint A shown observes the point P. The viewpoint A is a point located in the X direction relative to the shielded cable 1. Figure 2 As shown, the moving direction of the point P observed from the viewpoint A is the clockwise direction CW or the counterclockwise direction CCW about the center conductor 3. The moving direction of the point P observed from the viewpoint A is the twisting direction of the conductor wire.

[0025] The center conductor 3, for example, includes a plurality of wire bundles formed by sub-twisting a plurality of conductor wires. The plurality of wire bundles are further twisted. Furthermore, the center conductor 3 is not limited to being formed by twisting a plurality of wire bundles, but may be formed by twisting a single wire bundle consisting of a plurality of conductor wires. In the above case, the twisting direction of the conductor wires is defined as follows. An imaginary point P is assumed on a wire bundle. The point P is moved along the length direction of the wire bundle.

[0026] At this time, in the length direction of the shielded cable 1, point P is Figure 1 Move in the X direction as shown. Figure 1 The viewpoint A shows the viewpoint P. Figure 2 As shown, the moving direction of the point P observed from the viewpoint A is the clockwise direction CW or the counterclockwise direction CCW about the center conductor 3. The moving direction of the point P observed from the viewpoint A is the twisting direction of the conductor wire.

[0027] like Figure 2 As shown, the shielded cable 1 includes an insulator 5. In an orthogonal cross section, the insulator 5 is arranged on the outer peripheral side of the center conductor 3. For example, the outer peripheral surface of the center conductor 3 is in contact with the inner peripheral surface of the insulator 5. For example, the thickness of the insulator 5 is constant regardless of the position in the circumferential direction.

[0028] The insulator 5 includes ethylene-propylene rubber and ethylene-methyl acrylate copolymer, and includes a cross-linked mixture (hereinafter referred to as a specific mixture). The insulator 5 does not include components other than the specific mixture, except for inevitable impurities. For example, the insulator 5 may also include components other than the specific mixture within the scope that does not hinder the solution of the subject of the present disclosure.

[0029] The specific mixture is produced by, for example, mixing ethylene-propylene rubber and ethylene-methyl acrylate copolymer to form a mixture and crosslinking the mixture.

[0030] like Figure 2 As shown, the shielded cable 1 includes a shielding member 7. The shielding member 7 is arranged on the outer peripheral side of the insulator 5 in the orthogonal cross section. For example, the thickness of the shielding member 7 is constant regardless of the position in the circumferential direction. The shielding member 7 is, for example, a braided shielding member. Examples of the braided shielding member include copper foil braid, copper wire braid, copper alloy braid, etc. The shielding member 7 is, for example, thinner than the insulator 5.

[0031] like Figure 2 As shown, the shielded cable 1 includes a sheath 9. The sheath 9 is disposed on the outer peripheral side of the shield 7 in an orthogonal cross section. In the present embodiment, the inner peripheral surface of the sheath 9 is in contact with the outer peripheral surface of the shield 7.

[0032] For example, the thickness of the sheath 9 is constant regardless of the position in the circumferential direction. The sheath 9 is, for example, thicker than the insulator 5. The sheath 9 is, for example, thinner than the insulator 5 and thicker than the shield 7.

[0033] The sheath 9 contains, for example, a specific mixture. The sheath 9 contains, for example, no components other than the specific mixture except for inevitable impurities. For example, the sheath 9 may contain components other than the specific mixture within a range that does not hinder the solution of the subject of the present disclosure. The specific mixture in the sheath 9 is, for example, the same as the specific mixture in the insulator 5.

[0034] The sheath 9 may contain, for example, EPDM rubber. The sheath 9 does not contain any component other than EPDM rubber, except for inevitable impurities. The sheath 9 may contain any component other than EPDM rubber, for example, within the scope that does not hinder the solution of the subject of the present disclosure.

[0035] Furthermore, the sheath 9 may also contain thermoplastic polyurethane, for example. The sheath 9 does not contain any component other than thermoplastic polyurethane, for example, except for inevitable impurities. For example, the sheath 9 may also contain any component other than thermoplastic polyurethane, within the scope that does not hinder the solution of the subject of the present disclosure. For example, the bracket is mounted relative to the sheath 9 directly or via an intervening member such as rubber.

[0036] like Figure 2 As shown, the shielded cable 1 includes a first tape layer 11. The first tape layer 11 is arranged on the outer peripheral side of the insulator 5 in the orthogonal cross section. The first tape layer 11 is arranged between the insulator 5 and the shield 7 in the orthogonal cross section. For example, the outer peripheral surface of the first tape layer 11 contacts the inner peripheral surface of the shield 7. For example, the inner peripheral surface of the first tape layer 11 contacts the outer peripheral surface of the insulator 5.

[0037] The first tape layer 11 is made of paper, nonwoven fabric, or resin tape. The first tape layer 11 preferably does not contain any metal except for unavoidable impurities.

[0038] The first tape layer 11 is formed by, for example, spirally winding a tape. The tape is made of paper, nonwoven fabric, or resin tape. The resin tape is preferably made of foamed resin. The foamed resin is preferably foamed polypropylene or foamed polyethylene. The winding direction in the first tape layer 11 is defined as follows.

[0039] An imaginary point P is assumed on the tape constituting the first tape layer 11. The point P is moved along the length direction of the tape. At this time, in the length direction of the shielded cable 1, the point P moves to Figure 1 Move in the X direction as shown. Figure 1 The viewpoint A shows the viewpoint P. Figure 2As shown, the moving direction of the point P observed from the viewpoint A is the clockwise direction CW or the counterclockwise direction CCW about the center conductor 3. The moving direction of the point P observed from the viewpoint A is the winding direction in the first tape layer 11.

[0040] The winding direction of the first tape layer 11 is preferably opposite to the twisting direction of the conductor wires in the center conductor 3. In this embodiment, the twisting direction of the conductor wires in the center conductor 3 is the mother twisting direction in the center conductor 3. The first tape layer 11 is preferably thinner than the shield 7.

[0041] The winding pitch of the first tape layer 11 is preferably 2 to 5 times the diameter of the insulator 5. The winding pitch of the first tape layer 11 is the distance the tape advances in the longitudinal direction of the shielded cable 1 when the tape constituting the first tape layer 11 is wound once.

[0042] like Figure 2 As shown, the shielded cable 1 includes a second tape layer 13. The second tape layer 13 is arranged on the outer peripheral side of the shield 7 in the orthogonal cross section. The second tape layer 13 is arranged between the shield 7 and the sheath 9 in the orthogonal cross section. For example, the inner peripheral surface of the second tape layer 13 contacts the outer peripheral surface of the shield 7. For example, the outer peripheral surface of the second tape layer 13 contacts the inner peripheral surface of the sheath 9.

[0043] The second tape layer 13 is made of paper, nonwoven fabric, or resin tape. The second tape layer 13 preferably does not contain metal except for inevitable impurities. The second tape layer 13 is formed by, for example, spirally winding a tape-shaped tape. The tape is made of paper, nonwoven fabric, or resin tape. The resin tape is preferably made of foamed resin. The foamed resin is preferably, for example, foamed polypropylene or foamed polyethylene.

[0044] The second tape layer 13 is, for example, thinner than the shield 7. The tape of the second tape layer 13 is preferably the same as the tape of the first tape layer 11. In this case, the tape of the second tape layer 13 and the tape of the first tape layer 11 can be used in common.

[0045] The winding direction of the second tape layer 13 is defined as follows. An imaginary point P is assumed on the tape constituting the second tape layer 13. The point P is moved along the length direction of the tape. At this time, in the length direction of the shielded cable 1, the point P is Figure 1 Move in the X direction as shown. Figure 1 The viewpoint A shows the viewpoint P. Figure 2 As shown, the moving direction of the point P observed from the viewpoint A is the clockwise direction CW or the counterclockwise direction CCW around the center conductor 3 . The moving direction of the point P observed from the viewpoint A is the winding direction in the second tape layer 13 .

[0046] The winding direction of the second tape layer 13 is preferably opposite to the twisting direction of the conductor wires in the center conductor 3. The winding direction of the second tape layer 13 is preferably the same as the winding direction of the first tape layer 11.

[0047] The second tape layer 13 is preferably thinner than the shield 7. The winding pitch of the second tape layer 13 is preferably not less than 2 times and not more than 5 times the diameter of the insulator 5. The winding pitch of the second tape layer 13 is the distance that the tape advances in the longitudinal direction of the shielded cable 1 when the tape constituting the second tape layer 13 is wound once.

[0048] 2. Effect of shielded cable 1

[0049] (1A) The shielded cable 1 includes a first tape layer 11. The first tape layer 11 is disposed between the insulator 5 and the shield 7. The first tape layer 11 is made of paper, nonwoven fabric, or a resin tape.

[0050] The first tape layer 11 prevents the shield 7 from being damaged when the shield cable 1 is bent. The reason for this is presumed as follows: if the shield 7 is fixed to the insulator 5, when the shield cable 1 is bent, stress may be applied from the insulator 5 to the shield 7, thereby damaging the shield 7.

[0051] In the presence of the first tape layer 11, the shield 7 is difficult to be fixed to the insulator 5. Therefore, when the shielded cable 1 is bent, the shield 7 is easy to move relative to the insulator 5 in the longitudinal direction of the shield 7. As a result, when the shielded cable 1 is bent, stress is difficult to be applied to the shield 7 from the insulator 5, and the shield 7 is difficult to be damaged.

[0052] (1B) The shielded cable 1 includes the second tape layer 13. The second tape layer 13 is disposed between the sheath 9 and the shield 7. The second tape layer 13 is made of paper, nonwoven fabric, or resin tape.

[0053] The second tape layer 13 prevents the shield 7 from being damaged when the shield cable 1 is bent. The reason is presumed as follows: if the shield 7 is fixed to the sheath 9, when the shield cable 1 is bent, stress may be applied from the sheath 9 to the shield 7, thereby damaging the shield 7.

[0054] In the case where the second tape layer 13 is present, the shield 7 is difficult to be fixed to the sheath 9. Therefore, when the shielded cable 1 is bent, the shield 7 is easy to move relative to the sheath 9 in the longitudinal direction of the shield 7. As a result, when the shielded cable 1 is bent, stress is difficult to be applied to the shield 7 from the sheath 9, and the shield 7 is difficult to be damaged.

[0055] (1C) The twisting direction of the plurality of conductor wires in the center conductor 3 is opposite to the winding direction in the first tape layer 11. Therefore, the torsion of the shielded cable 1 caused by the twisting of the plurality of conductor wires in the center conductor 3 and the torsion of the shielded cable 1 caused by winding the first tape layer 11 can be offset. As a result, the torsion of the shielded cable 1 can be suppressed.

[0056] Furthermore, the twisting direction of the plurality of conductor wires in the center conductor 3 is opposite to the winding direction in the second tape layer 13. Therefore, the twisting of the shielded cable 1 caused by the twisting of the plurality of conductor wires in the center conductor 3 and the twisting of the shielded cable 1 caused by winding the second tape layer 13 can be offset. As a result, the twisting of the shielded cable 1 can be further suppressed.

[0057] (1D) The insulator 5 contains a specific mixture. Furthermore, the sheath 9 contains a specific mixture or EPDM rubber. Therefore, the shielded cable 1 is excellent in heat resistance, flexibility, and low-temperature bending durability. Low-temperature bending durability refers to the property that it is difficult to be damaged even if it is repeatedly bent in a low-temperature environment.

[0058] <Second embodiment>

[0059] 1. Differences from the first embodiment

[0060] The basic structure of the second embodiment is the same as that of the first embodiment, so the differences are described below. In addition, the same reference numerals as those of the first embodiment represent the same structure, and reference is made to the previous description.

[0061] In the first embodiment described above, the shielded cable 1 includes one central conductor 3 and one insulator 5. In contrast, the second embodiment is different from the first embodiment in that Figure 3 As shown, three twisted electric wires 21, 23, and 25 are provided.

[0062] The electric wires 21, 23, 25 are twisted. The twisting direction of the electric wires 21, 23, 25 is defined as follows.

[0063] Assume an imaginary point P on any one of the wires 21, 23, and 25. Move the point P along the length direction of the wire. At this time, in the length direction of the shielded cable 1, the point P moves to Figure 1 Move in the X direction as shown. Figure 1 The viewpoint A shows the viewpoint P. Figure 3 As shown, the moving direction of point P observed from viewpoint A is clockwise CW or counterclockwise CCW around the wires 21, 23, 25. The moving direction of point P observed from viewpoint A is the twisting direction of the wires 21, 23, 25.

[0064] The electric wire 21 includes a central conductor 31 and an insulator 33. The insulator 33 covers the central conductor 31. The central conductor 31 has the same structure as the central conductor 3 in the first embodiment. The insulator 33 has the same structure as the insulator 5 in the first embodiment. The electric wires 23 and 25 also have the same structure as the electric wire 21.

[0065] The first tape layer 11 is arranged on the outer peripheral side of the electric wires 21, 23, 25 in the orthogonal cross section. The first tape layer 11 is arranged between the electric wires 21, 23, 25 and the shield 7 in the orthogonal cross section. For example, the outer peripheral surface of the first tape layer 11 contacts the inner peripheral surface of the shield 7. For example, the inner peripheral surface of the first tape layer 11 contacts the outer peripheral surface of the insulator 33 in the electric wires 21, 23, 25.

[0066] The winding direction of the first tape layer 11 is preferably opposite to the twisting direction of the electric wires 21, 23, 25. The winding direction of the second tape layer 13 is preferably opposite to the twisting direction of the electric wires 21, 23, 25.

[0067] 2. Effect of shielded cable 1

[0068] According to the second embodiment described in detail above, the effects (1A), (1B), and (1D) of the first embodiment described above are achieved, and the following effects are also achieved.

[0069] (2A) The twisting direction of the electric wires 21, 23, 25 is opposite to the winding direction of the first tape layer 11. Therefore, the torsion of the shielded cable 1 caused by the twisting of the electric wires 21, 23, 25 and the torsion of the shielded cable 1 caused by winding the first tape layer 11 can be offset. As a result, the torsion of the shielded cable 1 can be suppressed.

[0070] Furthermore, the twisting direction of the electric wires 21, 23, 25 is opposite to the winding direction of the second tape layer 13. Therefore, the twisting of the shielded cable 1 caused by the twisting of the electric wires 21, 23, 25 and the twisting of the shielded cable 1 caused by winding the second tape layer 13 can be offset. As a result, the twisting of the shielded cable 1 can be further suppressed.

[0071] <Other embodiments>

[0072] As mentioned above, although embodiment of this disclosure was described, this disclosure is not limited to the said embodiment, Various deformation|transformation can be made and it can be implemented.

[0073] (1) The shielded cable 1 may not include one or both of the first tape layer 11 and the second tape layer 13 .

[0074] (2) In the first and second embodiments, the winding direction of the first tape layer 11 and the winding direction of the second tape layer 13 may be opposite to each other. In the first embodiment, the twisting direction of the plurality of conductor wires in the center conductor 3 may be the same as the winding direction of the first tape layer 11. Furthermore, the twisting direction of the plurality of conductor wires in the center conductor 3 may be the same as the winding direction of the second tape layer 13.

[0075] In the second embodiment, the twisting direction of the electric wires 21, 23, 25 may be the same as the winding direction of the first tape layer 11. Also, the twisting direction of the electric wires 21, 23, 25 may be the same as the winding direction of the second tape layer 13.

[0076] (3) In the first and second embodiments, the first tape layer 11 and the second tape layer 13 may be wound in a manner other than spirally, and may be longitudinally added, for example.

[0077] (4) In the second embodiment, three electric wires 21, 23, and 25 are provided. The number of electric wires may be, for example, two or four or more.

[0078] (5) The function of one component in each of the above embodiments may be shared by multiple components, or the functions of multiple components may be performed by one component. Furthermore, a part of the structure of each of the above embodiments may be omitted. Furthermore, at least a part of the structure of each of the above embodiments may be added to or replaced with the structure of another of the above embodiments.

[0079] (6) In addition to the above-described shielded cable 1 , the present disclosure can be implemented in various forms such as a system using the shielded cable 1 as a component and a method for manufacturing the shielded cable 1 .

Claims

1. A shielded cable, characterized in that: have: Center conductor; an insulator disposed on an outer peripheral side relative to the central conductor; A first tape layer, which is arranged on the outer peripheral side of the insulator and is composed of paper, nonwoven fabric, or resin tape; a shielding member disposed on an outer peripheral side relative to the first tape layer; A second tape layer, which is arranged on the outer peripheral side of the shielding member and is composed of paper, nonwoven fabric, or resin tape; and The sheath is arranged on the outer peripheral side of the second tape layer.

2. The shielded cable according to claim 1, characterized in that: The central conductor is formed by twisting a plurality of conductor wires. The first belt layer and the second belt layer are respectively wound in a spiral shape. The twisting direction of the plurality of conductor wires is opposite to the winding direction of the first tape layer and the winding direction of the second tape layer.

3. A shielded cable, characterized in that: have: Multiple wires twisted together; A first tape layer, which is arranged on the outer peripheral side relative to the plurality of electric wires and is composed of paper, nonwoven fabric, or resin tape; a shielding member disposed on an outer peripheral side relative to the first tape layer; A second tape layer, which is arranged on the outer peripheral side of the shielding member and is composed of paper, nonwoven fabric, or resin tape; and The sheath is arranged on the outer peripheral side of the second tape layer.

4. The shielded cable according to claim 3, characterized in that: The first belt layer and the second belt layer are respectively wound in a spiral shape. The twisting direction of the plurality of electric wires is opposite to the winding direction of the first tape layer and the winding direction of the second tape layer.

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