JP2018106857A - Composite cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite cable, in which a power line is apt to break earlier than a signal line, apt to reduce breaking the signal line.SOLUTION: A composite cable 1 includes a signal line 2 used for transmitting an electric signal, an electric power line 3 used for supplying electric power, and a sheath 4 for covering the circumference of the signal line 2 and the electric power line 3 together. In the composite cable 1, an axis distance a between a cable central axis 10 that is a cable axis and a signal-line central-axis 20 of the signal line 2 is smaller than an axis distance b between the cable central axis 10 that is the cable axis and a power-line central-axis 30 of the power line 3, in a cable cross section view.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a composite cable.

  2. Description of the Related Art Conventionally, in the field of vehicles such as automobiles, multi-core composite cables in which the outer periphery of a signal line used for transmitting an electric signal and a power line used for supplying power are collectively covered with a sheath are known.

  For example, Patent Document 1 discloses a composite cable for automobiles in which a brake cable and a sensor cable are covered and integrated with a common sheath.

JP 2014-241286 A

  However, the conventional composite cable has the following problems. The composite cable may be repeatedly bent by swinging the other end with one end fixed. Examples of such use include, for example, a case where a composite cable is applied as a cable for an electric brake of an automobile. In this case, the composite cable is repeatedly bent as the other end swings following the movement of the wheel as the vehicle travels with one end fixed to the vehicle body.

  When the composite cable is subjected to repeated bending as described above, high compressive and tensile stress is applied to the wires in the sheath that are further away from the cable shaft such as the cable center shaft. Breaks.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a composite cable in which a power line is more likely to be disconnected first than a signal line, and the disconnection of the signal line is easily suppressed.

One embodiment of the present invention is a signal line used for transmission of an electrical signal;
A power line used to supply power;
A composite cable having a sheath that collectively covers the outer periphery of the signal line and the power line,
A distance a between the cable axis of the composite cable and the signal line central axis of the signal line is determined by an axial distance b between the cable axis and the power line central axis of the power line as seen in the cable cross section of the composite cable. There is also a small, composite cable.

  The composite cable has the above configuration. Therefore, in the composite cable, the signal line is disposed closer to the cable axis than the power line, and the power line is disposed outside the power line. When the composite cable is repeatedly bent, the strain received by the wire on the cable shaft side is small, and the strain received by the wire on the outside is large. Therefore, according to the above composite cable, the power line located farther away from the cable shaft is more likely to be disconnected before the signal line, and the signal line that is closer to the cable axis and is less susceptible to distortion is less likely to be disconnected. Become. That is, a difference in durability against disconnection occurs between the signal line and the power line, and the power line is more likely to be disconnected first. Therefore, according to the composite cable, there is an advantage that it is possible to detect the disconnection of the power line using a signal line that is not disconnected.

FIG. 3 is an explanatory diagram schematically showing a cable cross section perpendicular to the cable central axis in the composite cable of Example 1. 6 is an explanatory diagram schematically showing a cross section of a cable perpendicular to a cable central axis in a composite cable of Example 2. FIG. 6 is an explanatory diagram schematically showing a cross section of a cable perpendicular to a cable central axis in a composite cable of Example 3. FIG. It is explanatory drawing which showed typically the cable cross section perpendicular | vertical to the cable center axis | shaft in the composite cable of Example 4. FIG. FIG. 10 is an explanatory diagram schematically showing a cable cross section perpendicular to the cable central axis in the composite cable of Example 5. 10 is an explanatory diagram schematically showing a cross section of a cable perpendicular to a cable central axis in a composite cable of Example 6. FIG. 10 is an explanatory view schematically showing a cable cross section perpendicular to the cable central axis in the composite cable of Example 7. FIG. 10 is an explanatory view schematically showing a cable cross section perpendicular to a cable central axis in a composite cable of Example 8. FIG.

  In the above-described composite cable, the outer shape of the cross section of the cable can be made into a perfect circle (including the equivalent to a perfect circle) in cable design. In this case, the above-described cable shaft is the cable central shaft. Moreover, the said composite cable can also make the external shape of a cable cross section elliptical (including the thing equivalent to an ellipse) on cable design. In this case, since the bending direction of the composite cable can be set to the short axis direction, the composite cable useful for the arrangement in a narrow space can be obtained. When the outer shape of the cable cross section is elliptical, the cable axis described above is the long axis of the elliptical shape when viewed from the cable cross section of the composite cable. Therefore, in this case, the inter-axis distance a is the shortest distance between the long axis and the signal line central axis, and the inter-axis distance b is the shortest distance between the long axis and the power line central axis.

  The composite cable may have one or more signal lines and two or more power lines. According to this configuration, it is easy to take a structure in which one or more signal lines are sandwiched between two or more power lines when viewed from the cable cross section. Therefore, according to this structure, it becomes easy to hold | maintain the state by which the signal wire | line was arrange | positioned near the cable axis. Therefore, it is easier to obtain a composite cable in which the power line is more likely to be disconnected earlier than the signal line, and the disconnection of the signal line is easily suppressed. Note that the number of signal lines may be two or more. The upper limit of the signal line can be set to 6 or less, for example. In addition, two or more signal lines may be twisted together. Moreover, the upper limit of a power line can be 6 or less.

  When the composite cable has a plurality of signal lines, the plurality of inter-axis distances a may be the same value or different values. Similarly, when the composite cable has a plurality of power lines, the plurality of inter-axis distances b may be the same value or different values. When the composite cable has one or more signal lines and one power line, the maximum value in one or more inter-axis distances a can be set smaller than the minimum value in one or more inter-axis distances b.

  In the composite cable, the signal line and the power line may be further twisted together. According to this configuration, it is easy to maintain a structure in which one or more signal lines are sandwiched between two or more power lines. Therefore, according to this configuration, the above-described effect can be easily ensured. In addition, the conductor cross-sectional area of the signal line can be configured to be smaller than the conductor cross-sectional area of the power line from the viewpoint of easy arrangement of the signal line near the cable axis.

  In the composite cable, the sheath may be configured not to be fixed to the signal line and the power line. According to this configuration, since the signal line and the power line can move within the sheath when the composite cable is bent, a composite cable advantageous in improving the bending resistance can be obtained. Further, according to this configuration, when the cable terminal is processed, the sheath can be easily peeled to expose the signal line and the power line, so that a composite cable excellent in cable processability can be obtained.

  The composite cable includes a motor signal line used for transmission / reception of an electric signal related to motor control, and may include a motor power line used for supplying electric power necessary for driving the motor. According to this configuration, for example, when a motor is provided in a vibrating part, the electric power necessary for driving the motor is supplied through the composite cable through the composite cable, and the motor is supplied through the motor signal line. Even when the composite cable is repeatedly bent when transmitting and receiving an electrical signal related to the control, a power cable can be easily broken before the signal line, and a composite cable that can easily suppress the signal line break can be obtained. In addition to the above-mentioned composite cable, for example, the vehicle speed is detected and collected by a wheel speed signal line used for transmission / reception of electric signals related to the rotation speed of the vehicle wheel, and the vehicle wheel and sensors arranged around the wheel. The sensor signal line can be included.

  The composite cable can be suitably used for an electric brake. In this case, the composite cable is, for example, an electric motor having a motor provided at one end of the composite cable and connected to a vehicle body side device (ECU or the like) disposed on the vehicle body side of the vehicle and provided on the vehicle wheel side. The other end of the composite cable can be connected to the brake device. Therefore, in this case, the composite cable is in a state in which one end of the composite cable is fixed to the vehicle body side, and the other end of the composite cable swings following the movement of the wheel as the vehicle travels. It will be bent repeatedly (unloaded bending). Therefore, it is easier to disconnect the power line than the signal line, and detect the disconnection of the power line using the signal line that is not disconnected by applying the above composite cable that is easy to suppress the disconnection of the signal line. Can do. As a result, it is possible to realize a warning to the vehicle driver, a vehicle stoppage measure by an interlock, and the like.

  In addition, each structure mentioned above can be arbitrarily combined as needed, in order to acquire each effect etc. which were mentioned above.

  Hereinafter, the composite cable of an Example is demonstrated using drawing. In addition, about the same member, it demonstrates using the same code | symbol.

Example 1
The composite cable of Example 1 will be described with reference to FIG. As shown in FIG. 1, the composite cable 1 of this example includes a signal line 2, a power line 3, and a sheath 4. The details will be described below.

The signal line 2 is used for transmission of electrical signals. In this example, the signal line 2 can be, for example, a motor signal line used for transmission / reception of electric signals related to motor control. Specifically, the signal line 2 includes a conductor 21 and an insulator 22 that covers the outer periphery of the conductor 21. The conductor 21 can be formed from, for example, copper or a copper alloy, or aluminum or an aluminum alloy. The conductor cross-sectional area can be set to 0.1 to 0.75 mm ² , for example. The insulator 22 can be formed of, for example, a polyolefin resin such as polyethylene, a vinyl chloride resin such as vinyl chloride, or the like. The thickness of the insulator 22 can be set to 0.1 to 0.5 mm, for example.

  FIG. 1 shows an example in which the composite cable 1 has two signal lines 2. The two signal lines 2 are twisted in a spiral shape. In FIG. 1, a dotted line 23 indicates a signal stranded wire formed by twisting a plurality of signal lines 2 surrounded by a dotted line.

The power line 3 is used for power supply. In this example, the power line 3 can be, for example, a motor signal line used for transmission of an electrical signal related to motor control. Specifically, the power line 3 includes a conductor 31 and an insulator 32 that covers the outer periphery of the conductor 31. The conductor 31 can be formed from, for example, copper or a copper alloy, or aluminum or an aluminum alloy. The conductor cross-sectional area can be set to, for example, 1.25 to 8 mm ² . The insulator 32 can be formed of, for example, a polyolefin resin such as polyethylene, a vinyl chloride resin such as vinyl chloride, or the like. The thickness of the insulator 32 can be 0.3-1 mm, for example.

  In FIG. 1, an example in which the composite cable 1 has two power lines 3 is shown.

  The sheath 4 collectively covers the outer periphery of the signal line 2 and the power line 3. The sheath 4 can be formed from polyurethane resin, for example. FIG. 1 shows an example in which the composite cable 1 has a solid structure in which the inner peripheral surface of the sheath 4 is in contact with the surfaces of the signal line 2 and the power line 3. In this example, the sheath 4 is not fixed to the signal line 2 and the power line 3. In addition, the composite cable 1 may have a hollow structure (not shown) including a gap between the inner peripheral surface of the sheath 4 and the surfaces of the signal line 2 and the power line 3. The outer diameter of the composite cable 1 can be 5-20 mm, for example.

  In addition, when it has the said space | gap, it can have an inclusion in a space | gap. In this case, the unevenness of the cable surface is alleviated by the inclusions. Therefore, it is difficult to form irregularities on the surface of the sheath 4, and the composite cable 1 having a good appearance with less waviness or the like can be obtained. Inclusions can be composed of one or more kinds. Examples of the material of inclusions include papers, polyolefin resins such as polyethylene, and talc.

  Specifically, the composite cable 1 of this example has one signal stranded wire 23 formed by twisting two signal wires 2 and two power lines 3. In the composite cable 1 of this example, the outer shape of the cable cross section is a perfect circle in terms of cable design. In this example, in cable design, the twisted wire central axis (not shown) of the signal twisted wire 23 is arranged so as to coincide with the cable central shaft 10 as the cable shaft. Two power lines 3 are arranged on the outer periphery of the signal stranded wire 23. Specifically, one power line 3 is arranged on each of both sides of the signal stranded wire 23. The cable center axis 10, the stranded wire center axis, and the power line center axis 30 are all arranged on the same line in a cable cross-sectional view. The signal stranded wire 23 and the two power lines 3 are twisted together.

  When the composite cable 1 is viewed from the cable cross section, the inter-axis distance a between the cable center axis 10 as the cable axis and the signal line center axis 20 of the signal line 2 is the power line of the cable center axis 10 and the power line 3 as the cable axis. It is set smaller than the inter-axis distance b with the central axis 30 (a <b).

  Next, the effect of the composite cable of this example will be described.

  The composite cable 1 has the above configuration. Therefore, in the composite cable 1, the signal line 2 is disposed closer to the cable center axis 10 than the power line 3, and the power line 3 is disposed outside thereof. When the composite cable 1 is repeatedly bent, the strain received by the wire on the cable center axis 10 side is small, and the strain received by the wire on the outside is large. Therefore, according to the composite cable 1, the power line 3 located farther away from the cable center axis 10 is more likely to be disconnected before the signal line 2, and is near the cable center axis 10 and hardly receives distortion. The signal line 2 is difficult to be disconnected. That is, there is a difference in durability against disconnection between the signal line 2 and the power line 3, and the power line 3 is more likely to be disconnected first. Therefore, the composite cable 1 has an advantage that it is possible to detect the disconnection of the power line 3 using the signal line 2 that is not disconnected.

  Specifically, the composite cable 1 of this example can be used, for example, for supplying power to one DC motor and controlling the DC motor.

(Example 2)
The composite cable 1 of Example 2 is demonstrated using FIG. The composite cable 1 of this example has two signal lines 2 and three power lines 3. Specifically, the composite cable 1 has one signal stranded wire 23 formed by twisting two signal wires 2 and three power lines 3.

  In this example, the twisted wire central axis (not shown) of the signal twisted wire 23 is arranged so as to coincide with the cable central shaft 10 in cable design. Three power lines 3 are arranged on the outer periphery of the signal stranded wire 23. Specifically, one power line 3 is disposed on one side of the signal stranded wire 23, and two power lines 3 are disposed on the other side. The signal stranded wire 23 and the three power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b.

  Specifically, the composite cable 1 of this example can be used, for example, to supply power to one three-phase motor and control the three-phase motor.

  Other configurations and operational effects are the same as those of the first embodiment.

(Example 3)
The composite cable 1 of Example 3 is demonstrated using FIG. The composite cable 1 of this example has two signal lines 2 and four power lines 3. Specifically, the composite cable 1 has one signal stranded wire 23 formed by twisting two signal wires 2 and four power lines 3.

  In this example, the twisted wire central axis (not shown) of the signal twisted wire 23 is arranged so as to coincide with the cable central shaft 10 in cable design. In addition, four power lines 3 are arranged on the outer periphery of the signal stranded wire 23. Specifically, the two power lines 3 are arranged on one side of the signal stranded wire 23 and the two power lines 3 are arranged on the other side. The signal stranded wire 23 and the four power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b. In FIG. 3, for simplification, the inter-axis distance b is shown only for some of the power lines 3, and the inter-axis distance b is omitted for the remaining power lines 3.

  Specifically, the composite cable 1 of this example can be used, for example, to supply power to two DC motors and to control these DC motors.

  Other configurations and operational effects are the same as those of the first embodiment.

Example 4
The composite cable 1 of Example 4 is demonstrated using FIG. The composite cable 1 of this example has two signal lines 2 and five power lines 3. Specifically, the composite cable 1 has one signal stranded wire 23 formed by twisting two signal wires 2 and five power lines 3.

  In this example, the twisted wire central axis (not shown) of the signal twisted wire 23 is arranged so as to coincide with the cable central shaft 10 in cable design. Further, five power lines 3 are arranged on the outer periphery of the signal stranded wire 20. The signal stranded wire 23 and the five power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b. In FIG. 4, for simplification, the inter-axis distance b is shown only for some of the power lines 3, and the inter-axis distance b is omitted for the remaining power lines 3.

  Specifically, the composite cable 1 of the present example can be used for supplying power to, for example, controlling one DC motor and one three-phase motor.

  Other configurations and operational effects are the same as those of the first embodiment.

(Example 5)
The composite cable 1 of Example 5 is demonstrated using FIG. The composite cable 1 of this example has two signal lines 2 and six power lines 3. Specifically, the composite cable 1 has one signal stranded wire 23 formed by twisting two signal wires 2 and six power lines 3.

  In this example, the twisted wire central axis (not shown) of the signal twisted wire 23 is arranged so as to coincide with the cable central shaft 10 in cable design. Further, six power lines 3 are arranged on the outer periphery of the signal stranded wire 23. The signal stranded wire 23 and the six power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b. In FIG. 5, for simplification, the inter-axis distance b is shown only for some of the power lines 3, and the inter-axis distance b is omitted for the remaining power lines 3.

  Specifically, the composite cable 1 of this example can be used, for example, to supply electric power to two three-phase motors and to control these motors.

  Other configurations and operational effects are the same as those of the first embodiment.

(Example 6)
The composite cable 1 of Example 6 is demonstrated using FIG. The composite cable 1 of this example has four signal lines 2 and two power lines 3. Specifically, the composite cable 1 has one signal stranded wire 23 formed by twisting four signal wires 2 and two power lines 3.

  In this example, the twisted wire central axis (not shown) of the signal twisted wire 23 is arranged so as to coincide with the cable central shaft 10 in cable design. Two power lines 3 are arranged on the outer periphery of the signal stranded wire 23. Specifically, one power line 3 is arranged on each of both sides of the signal stranded wire 23. The cable center axis 10, the stranded wire center axis, and the power line center axis 30 are all arranged on the same line in a cable cross-sectional view. The signal stranded wire 23 and the two power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b. In FIG. 6, for simplification, the inter-axis distance “a” is shown only for some signal lines 2, and the inter-axis distance “a” is omitted for the remaining signal lines 2.

  Specifically, the composite cable 1 of this example can be used, for example, for supplying power to one DC motor and controlling the DC motor.

  Other configurations and operational effects are the same as those of the first embodiment.

(Example 7)
The composite cable 1 of Example 7 is demonstrated using FIG. The composite cable 1 of this example has four signal lines 2 and two power lines 3. Specifically, the composite cable 1 has two signal stranded wires 23 formed by twisting two signal wires 2 and two power lines 3.

  In this example, the cable design is such that the midpoint between each twisted wire central axis (not shown) of the two signal twisted wires 23 coincides with the cable central shaft 10. Two power lines 3 are arranged on the outer periphery of the two signal stranded wires 20. Specifically, one power line 3 is arranged on each side of the two signal stranded wires 23 with the signal stranded wire 23 interposed therebetween. The two signal stranded wires 23 and the two power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b. In FIG. 7, for simplification, the inter-axis distance “a” is shown only for some signal lines 2, and the inter-axis distance “a” is omitted for the remaining signal lines 2.

  Specifically, the composite cable 1 of this example can be used, for example, for supplying power to one DC motor and controlling the DC motor.

  Other configurations and operational effects are the same as those of the first embodiment.

(Example 8)
The composite cable 1 of Example 8 is demonstrated using FIG. The composite cable 1 of this example has six signal lines 2 and two power lines 3. Specifically, the composite cable 1 has three signal stranded wires 23 formed by twisting two signal wires 2 and two power lines 3.

  In this example, three signal stranded wires 23 are arranged on the outer periphery of the cable center shaft 10 in cable design. Two power lines 3 are arranged on the outer periphery of the three signal stranded wires 23. Specifically, one power line 3 is arranged on each side of the three signal stranded wires 23 sandwiched therebetween. The three signal stranded wires 23 and the two power lines 3 are twisted together. The composite cable 1 satisfies the inter-axis distance a <the inter-axis distance b.

  Specifically, the composite cable 1 of this example can be used, for example, for supplying power to one DC motor and controlling the DC motor.

  Other configurations and operational effects are the same as those of the first embodiment.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, A various change is possible within the range which does not impair the meaning of this invention.

1 Composite cable 10 Cable center axis (cable axis)
2 Signal line 20 Signal line center axis 3 Power line 30 Power line center axis 4 Sheath a Distance between axes of cable center axis (cable axis) and signal line center axis b Between axis between cable center axis (cable axis) and power line center axis distance

Claims (5)

A signal line used to transmit electrical signals;
A power line used to supply power;
A composite cable having a sheath that collectively covers the outer periphery of the signal line and the power line,
A distance a between the cable axis of the composite cable and the signal line central axis of the signal line is determined by an axial distance b between the cable axis and the power line central axis of the power line as seen in the cable cross section of the composite cable. Also small, composite cable.   The composite cable according to claim 1, wherein the composite cable includes one or more signal lines and two or more power lines.   The composite cable according to claim 1, wherein the sheath is not fixed to the signal line and the power line. Including signal lines for motors used to send and receive electrical signals for motor control,
The composite cable according to claim 1, comprising a motor power line used for supplying electric power necessary for driving the motor.   The composite cable according to any one of claims 1 to 4, which is for an electric brake.

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