Shield cable
By integrating tape layers between the insulator and shield, and between the shield and sheath, the shielded cable mitigates damage from bending by allowing the shield to move freely, thus enhancing its durability.
Patent Information
- Application Number
- JP2023198261
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-22
- Publication Date
- 2025-06-03
AI Technical Summary
Shielded cables are prone to damage when bent, particularly to the shield, due to stress application from adjacent components.
Incorporating first and second tape layers made of paper, non-woven fabric, or resin tape between the insulator and shield, and between the shield and sheath respectively, to prevent adhesion and allow the shield to move freely when bent.
The tape layers effectively suppress damage to the shield by allowing it to move longitudinally and reducing stress application from adjacent components during bending, thereby enhancing the cable's durability.
Smart Images
Figure 2025084391000001_ABST
Abstract
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 central conductor, an insulator, a shield, and a sheath. The insulator is disposed on the outer peripheral side of the central conductor. The shield is disposed on the outer peripheral side of the insulator. The sheath is disposed on the outer peripheral side of the shield.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] When the shielded cable is bent, the shield may be damaged. In one aspect of the present disclosure, it is preferable to provide a shielded cable capable of suppressing damage to the shield when the shielded cable is bent.
Means for Solving the Problems
[0005] One aspect of the present disclosure is a shielded cable including a central conductor, an insulator disposed on the outer peripheral side of the central conductor, a first tape layer disposed on the outer peripheral side of the insulator and made of paper, non-woven fabric, or resin tape, a shield disposed on the outer peripheral side of the first tape layer, a second tape layer disposed on the outer peripheral side of the shield and made of paper, non-woven fabric, or resin tape, and a sheath disposed on the outer peripheral side of the second tape layer. One aspect of the present disclosure is a shielded cable that can suppress damage to the shield when the shielded cable is bent.
[0006] Another aspect of the present disclosure is a shielded cable including a plurality of twisted electric wires, a first tape layer disposed on the outer peripheral side of the plurality of electric wires and made of paper, non-woven fabric, or resin tape, a shield disposed on the outer peripheral side of the first tape layer, a second tape layer disposed on the outer peripheral side of the shield and made of paper, non-woven fabric, or resin tape, and a sheath disposed on the outer peripheral side of the second tape layer.
[0007] One aspect of the present disclosure is a shielded cable that can suppress damage to the shield when the shielded cable is bent.
Brief Description of the Drawings
[0008]
Figure 1
Figure 2
Figure 3
Embodiments for Carrying Out the Invention
[0009] Exemplary embodiments of the present disclosure will be described with reference to the drawings. <First Embodiment> 1. Configuration of the Shielded Cable 1 Based on FIGS. 1 and 2, the configuration of the shielded cable 1 will be described. As shown in FIG. 1, the shielded cable 1 is a linear member. The shielded cable 1 is, for example, a cable for IWM.
[0010] As shown in FIG. 2, the shielded cable 1 includes a center conductor 3. The center conductor 3 is located at the center of the shielded cable 1 in a cross-section orthogonal to the longitudinal 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 strands. The conductor strands are made of, for example, copper, copper alloy, etc. The conductor strands may be tinned soft copper wires.
[0011] The plurality of conductor strands are, for example, twisted together. The twisting direction of the conductor strands is defined as follows. As shown in FIG. 1, assume a virtual point P on one conductor strand. Move the point P along the longitudinal direction of the conductor strand.
[0012] At this time, the point P moves in the X direction shown in FIG. 1 in the longitudinal direction of the shielded cable 1. Observe the point P from the viewing point A shown in FIG. 1. The viewing point A is a point in the X direction with respect to the shielded cable 1. The moving direction of the point P as seen from the viewing point A is clockwise CW around the center conductor 3 or counterclockwise CCW around the center conductor 3 as shown in FIG. 2. The moving direction of the point P as seen from the viewing point A is defined as the twisting direction of the conductor strands.
[0013] The center conductor 3 includes, for example, a plurality of bundles formed by stranding a plurality of conductor strands. The plurality of bundles are further twisted together. Also, the center conductor 3 is not limited to being formed by twisting a plurality of bundles, and may be formed by twisting together one bundle composed of a plurality of conductor strands. In these cases, the twisting direction of the conductor strands is defined as follows. Assume a virtual point P on one bundle. Move the point P along the longitudinal direction of the bundle.
[0014] At this time, the point P moves in the X direction shown in FIG. 1 in the longitudinal direction of the shielded cable 1. Observe the point P from the viewing point A shown in FIG. 1. The moving direction of the point P as seen from the viewing point A is clockwise CW around the center conductor 3 or counterclockwise CCW around the center conductor 3 as shown in FIG. 2. The moving direction of the point P as seen from the viewing point A is defined as the twisting direction of the conductor strands.
[0015] As shown in FIG. 2, the shielded cable 1 includes an insulator 5. In the orthogonal cross-section, the insulator 5 is disposed 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.
[0016] The insulator 5 includes ethylene propylene rubber and an 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, excluding inevitable impurities, for example. The insulator 5 may include components other than the specific mixture, for example, within a range that does not prevent the solution of the problems of the present disclosure.
[0017] The specific mixture can be produced, for example, by mixing ethylene propylene rubber and an ethylene methyl acrylate copolymer to produce a mixture and cross-linking the mixture. As shown in FIG. 2, the shielded cable 1 includes a shield 7. The shield 7 is disposed on the outer peripheral side of the insulator 5 in the orthogonal cross-section. For example, the thickness of the shield 7 is constant regardless of the position in the circumferential direction. The shield 7 is, for example, a braided shield. Examples of the braided shield include copper foil wire braiding, copper strand braiding, and copper alloy braiding. The shield 7 is, for example, thinner than the insulator 5.
[0018] As shown in FIG. 2, the shielded cable 1 includes a sheath 9. The sheath 9 is disposed on the outer peripheral side of the shield 7 in the 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.
[0019] 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. The sheath 9 contains, for example, a specific mixture. The sheath 9 contains no components other than the specific mixture, excluding inevitable impurities. The sheath 9 may contain components other than the specific mixture, for example, within a range that does not prevent the solution of the problems of the present disclosure. The specific mixture in the sheath 9 is, for example, the same as the specific mixture in the insulator 5.
[0020] The sheath 9 may contain, for example, ethylene propylene diene rubber. The sheath 9 contains no components other than ethylene propylene diene rubber, excluding inevitable impurities. The sheath 9 may contain components other than ethylene propylene diene rubber, for example, within a range that does not prevent the solution of the problems of the present disclosure.
[0021] Also, the sheath 9 may contain, for example, thermoplastic urethane. The sheath 9 contains no components other than thermoplastic urethane, excluding inevitable impurities. The sheath 9 may contain components other than thermoplastic urethane, for example, within a range that does not prevent the solution of the problems of the present disclosure. For example, a bracket is attached to the sheath 9 directly or via an intervening material such as rubber.
[0022] As shown in FIG. 2, the shielded cable 1 includes a first tape layer 11. The first tape layer 11 is disposed on the outer peripheral side of the insulator 5 in a cross-sectional view perpendicular to the axis. The first tape layer 11 is disposed between the insulator 5 and the shield 7 in a cross-sectional view perpendicular to the axis. For example, the outer peripheral surface of the first tape layer 11 is in contact with the inner peripheral surface of the shield 7. For example, the inner peripheral surface of the first tape layer 11 is in contact with the outer peripheral surface of the insulator 5.
[0023] The first tape layer 11 is made of paper, non-woven fabric, or resin tape. Preferably, the first tape layer 11 contains no metal, excluding inevitable impurities. The first tape layer 11 is formed, for example, by spirally winding a strip-shaped tape. The tape is made of paper, non-woven 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. The winding direction in the first tape layer 11 is defined as follows.
[0024] Assume a virtual point P on the tape constituting the first tape layer 11. Move the point P along the longitudinal direction of the tape. At this time, the point P moves in the X direction shown in FIG. 1 in the longitudinal direction of the shield cable 1. Observe the point P from the viewing point A shown in FIG. 1. The moving direction of the point P as seen from the viewing point A is clockwise CW around the center conductor 3 or counterclockwise CCW around the center conductor 3 as shown in FIG. 2. The moving direction of the point P as seen from the viewing point A is defined as the winding direction in the first tape layer 11.
[0025] The winding direction in the first tape layer 11 is preferably opposite to the twisting direction of the conductor strands in the center conductor 3. In the present embodiment, the twisting direction of the conductor strands in the center conductor 3 is the parent twisting direction in the center conductor 3. The first tape layer 11 is preferably thinner than the shield 7.
[0026] The winding pitch of the first tape layer 11 is preferably 2 times or more and 5 times or less the diameter of the insulator 5. The winding pitch of the first tape layer 11 is the distance that the tape advances in the longitudinal direction of the shield cable 1 when the tape constituting the first tape layer 11 makes one turn.
[0027] As shown in FIG. 2, the shield cable 1 includes a second tape layer 13. The second tape layer 13 is disposed on the outer peripheral side of the shield 7 in the orthogonal cross section. The second tape layer 13 is disposed 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 is in contact with the outer peripheral surface of the shield 7. For example, the outer peripheral surface of the second tape layer 13 is in contact with the inner peripheral surface of the sheath 9.
[0028] The second tape layer 13 is made of paper, non-woven fabric, or resin tape. The second tape layer 13 preferably contains no metal except for inevitable impurities. The second tape layer 13 is formed, for example, by spirally winding a strip-shaped tape. The tape is made of paper, non-woven fabric, or resin tape. The resin tape may be made of foamed resin. The foamed resin may be, for example, foamed polypropylene or foamed polyethylene. The second tape layer 13 is, for example, thinner than the shield 7. It is preferable that the tape of the second tape layer 13 is the same as the tape of the first tape layer 11. In this case, it becomes possible to make the tapes of the second tape layer 13 and the first tape layer 11 common.
[0029] The winding direction in the second tape layer 13 is defined as follows. Assume a virtual point P on the tape constituting the second tape layer 13. Move the point P along the longitudinal direction of the tape. At this time, the point P moves in the X direction shown in FIG. 1 in the longitudinal direction of the shield cable 1. Observe the point P from the viewing point A shown in FIG. 1. The moving direction of the point P as seen from the viewing point A is clockwise CW around the center conductor 3 or counterclockwise CCW around the center conductor 3, as shown in FIG. 2. The moving direction of the point P as seen from the viewing point A is defined as the winding direction in the second tape layer 13.
[0030] The winding direction in the second tape layer 13 is preferably opposite to the twisting direction of the conductor strands in the center conductor 3. The winding direction in the second tape layer 13 is preferably the same as the winding direction in the first tape layer 11.
[0031] The second tape layer 13 is preferably thinner than the shield 7. The winding pitch of the second tape layer 13 is preferably 2 times or more and 5 times or less 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 shield cable 1 when the tape constituting the second tape layer 13 makes one turn.
[0032] 2. Effects of the shield cable 1 (1A) The shield 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, non-woven fabric, or resin tape.
[0033] The first tape layer 11 suppresses damage to the shield 7 when the shield cable 1 is bent. The reason is presumably as follows. If the shield 7 is fixed to the insulator 5, when the shield cable 1 is bent, stress is applied from the insulator 5 to the shield 7, and the shield 7 may be damaged.
[0034] When the first tape layer 11 exists, it is difficult for the shield 7 to adhere to the insulator 5. Therefore, when the shield cable 1 is bent, the shield 7 can easily move in the longitudinal direction of the shield 7 with respect to the insulator 5. As a result, when the shield cable 1 is bent, it is difficult for stress to be applied from the insulator 5 to the shield 7, and the shield 7 is difficult to be damaged.
[0035] (1B) The shield cable 1 includes a 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, non-woven fabric, or resin tape.
[0036] The second tape layer 13 suppresses damage to the shield 7 when the shield cable 1 is bent. The reason is presumably as follows. If the shield 7 is fixed to the sheath 9, when the shield cable 1 is bent, stress is applied from the sheath 9 to the shield 7, and the shield 7 may be damaged.
[0037] When the second tape layer 13 exists, it is difficult for the shield 7 to adhere to the sheath 9. Therefore, when the shield cable 1 is bent, the shield 7 can easily move in the longitudinal direction of the shield 7 with respect to the sheath 9. As a result, when the shield cable 1 is bent, it is difficult for stress to be applied from the sheath 9 to the shield 7, and the shield 7 is difficult to be damaged.
[0038] (1C) The twisting direction of the plurality of conductor strands in the central conductor 3 is opposite to the winding direction in the first tape layer 11. Therefore, the twist of the shielded cable 1 caused by the twisting of the plurality of conductor strands in the central conductor 3 can cancel out the twist of the shielded cable 1 caused by winding the first tape layer 11. As a result, the twist of the shielded cable 1 can be suppressed.
[0039] Furthermore, the twisting direction of the plurality of conductor strands in the central conductor 3 is opposite to the winding direction in the second tape layer 13. Therefore, the twist of the shielded cable 1 caused by the twisting of the plurality of conductor strands in the central conductor 3 can cancel out the twist of the shielded cable 1 caused by winding the second tape layer 13. As a result, the twist of the shielded cable 1 can be further suppressed.
[0040] (1D) The insulator 5 contains a specific mixture. Also, the sheath 9 contains a specific mixture or ethylene propylene diene rubber. Therefore, the shielded cable 1 is excellent in heat resistance, flexibility, and low-temperature bending durability. Low-temperature bending durability means the property of being difficult to be damaged even when bent repeatedly in a low-temperature environment. <Second Embodiment> 1. Differences from the First Embodiment Since the basic configuration of the second embodiment is the same as that of the first embodiment, the differences will be described below. Note that the same reference numerals as those in the first embodiment denote the same configurations, and refer to the previous description.
[0041] In the first embodiment described above, the shielded cable 1 included one central conductor 3 and one insulator 5. In contrast, in the second embodiment, as shown in FIG. 3, it is different from the first embodiment in that it includes three twisted wires 21, 23, and 25.
[0042] The wires 21, 23, and 25 are twisted together. The twisting direction of the wires 21, 23, and 25 is defined as follows. Assume a virtual point P on any one of the wires 21, 23, and 25. Move the point P along the longitudinal direction of the wire. At this time, the point P moves in the X direction shown in FIG. 1 in the longitudinal direction of the shield cable 1. Observe the point P from the viewing point A shown in FIG. 1. The moving direction of the point P as seen from the viewing point A is clockwise CW around the wires 21, 23, and 25, or counterclockwise CCW around the wires 21, 23, and 25, as shown in FIG. 3. The moving direction of the point P as seen from the viewing point A is defined as the twisting direction of the wires 21, 23, and 25.
[0043] The 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 configuration as the central conductor 3 in the first embodiment. The insulator 33 has the same configuration as the insulator 5 in the first embodiment. The wires 23 and 25 also have the same configuration as the wire 21.
[0044] The first tape layer 11 is disposed on the outer peripheral side of the wires 21, 23, and 25 in the orthogonal cross-section. The first tape layer 11 is disposed between the wires 21, 23, and 25 and the shield 7 in the orthogonal cross-section. For example, the outer peripheral surface of the first tape layer 11 is in contact with the inner peripheral surface of the shield 7. For example, the inner peripheral surface of the first tape layer 11 is in contact with the outer peripheral surface of the insulator 33 in the wires 21, 23, and 25.
[0045] The winding direction in the first tape layer 11 is preferably opposite to the twisting direction of the wires 21, 23, and 25. The winding direction in the second tape layer 13 is preferably opposite to the twisting direction of the wires 21, 23, and 25.
[0046] 2. Effects of the shield cable 1 According to the second embodiment described in detail above, the effects (1A), (1B), and (1D) of the first embodiment described above are achieved, and further, the following effects are achieved.
[0047] (2A) The twisting directions of the electric wires 21, 23, and 25 are opposite to the winding direction in the first tape layer 11. Therefore, the twist of the shield cable 1 caused by the twisting of the electric wires 21, 23, and 25 can cancel out the twist of the shield cable 1 caused by winding the first tape layer 11. As a result, the twist of the shield cable 1 can be suppressed.
[0048] Furthermore, the twisting directions of the electric wires 21, 23, and 25 are opposite to the winding direction in the second tape layer 13. Therefore, the twist of the shield cable 1 caused by the twisting of the electric wires 21, 23, and 25 can cancel out the twist of the shield cable 1 caused by winding the second tape layer 13. As a result, the twist of the shield cable 1 can be further suppressed. <Other Embodiments> As described above, the embodiments of the present disclosure have been explained. However, the present disclosure is not limited to the above-described embodiments and can be implemented with various modifications.
[0049] (1) The shield cable 1 may not include one or both of the first tape layer 11 and the second tape layer 13. (2) In the first and second embodiments, the winding direction in the first tape layer 11 and the winding direction in the second tape layer 13 may be opposite to each other. In the first embodiment, the twisting direction of the plurality of conductor strands in the center conductor 3 may be the same as the winding direction in the first tape layer 11. Also, the twisting direction of the plurality of conductor strands in the center conductor 3 may be the same as the winding direction in the second tape layer 13. In the second embodiment, the twisting direction of the electric wires 21, 23, and 25 may be the same as the winding direction in the first tape layer 11. Also, the twisting direction of the electric wires 21, 23, and 25 may be the same as the winding direction in the second tape layer 13.
[0050] (3) In the first and second embodiments, the winding manner of the tapes in the first tape layer 11 and the second tape layer 13 does not have to be spiral, and for example, it may be side-by-side. (4) In the second embodiment, three electric wires 21, 23, and 25 were provided. The number of electric wires may be, for example, two or four or more.
[0051] (5) The functions of one component in each of the above embodiments may be shared among a plurality of components, or the functions of a plurality of components may be exerted by one component. Also, a part of the configuration of each of the above embodiments may be omitted. Further, at least a part of the configuration of each of the above embodiments may be added to, replaced with, etc. the configuration of other above embodiments.
[0052] (6) In addition to the shielded cable 1 described above, the present disclosure can also be realized in various forms such as a system having the shielded cable 1 as a component, a manufacturing method of the shielded cable 1, etc.
Explanation of Reference Numerals
[0053] 1... Shielded cable, 3... Central conductor, 5... Insulator, 7... Shield, 9... Sheath, 11... First tape layer, 13... Second tape layer, 21, 23, 25... Electric wires, 31... Central conductor, 33... Insulator
Claims
1. A central conductor, an insulator disposed on the outer peripheral side of the central conductor, a first tape layer disposed on the outer peripheral side of the insulator and made of paper, non-woven fabric, or resin tape, a shield disposed on the outer peripheral side of the first tape layer, a second tape layer disposed on the outer peripheral side of the shield and made of paper, non-woven fabric, or resin tape, a sheath disposed on the outer peripheral side of the second tape layer, comprising a shielded cable.
2. The shielded cable according to Claim 1, wherein the central conductor is formed by twisting a plurality of conductor strands, the first tape layer and the second tape layer are each wound in a spiral shape, and the twisting direction of the plurality of conductor strands is opposite to the winding direction in the first tape layer and the winding direction in the second tape layer. A shielded cable.
3. A plurality of twisted electric wires, a first tape layer disposed on the outer peripheral side of the plurality of electric wires and made of paper, non-woven fabric, or resin tape, a shield disposed on the outer peripheral side of the first tape layer, a second tape layer disposed on the outer peripheral side of the shield and made of paper, non-woven fabric, or resin tape, a sheath disposed on the outer peripheral side of the second tape layer, comprising a shielded cable.
4. The shielded cable according to Claim 3, wherein the first tape layer and the second tape layer are each wound in a spiral shape, and the twisting direction of the plurality of electric wires is opposite to the winding direction in the first tape layer and the winding direction in the second tape layer. A shielded cable.
Citation Information
Patent Citations
Power cable for in-wheel motor and wiring structure for the same
JP2018065545A