JP6354675B2 - Multicore cable for automobile - Google Patents

Description

  The present invention relates to an automobile multicore cable.

  As a parking brake device used when a car is parked, an electric parking brake device in which a caliper is operated by a motor has been widely used. The electric parking brake device is attached to a wheel, and is configured such that a motor operates based on a signal transmitted from an electronic control unit provided on the vehicle body side via a multicore cable. This multi-core cable has two insulated wires twisted together and a sheath that covers the two insulated wires. (For example, patent document 1). Further, an ABS (anti-lock brake system) sensor cable or the like may be further arranged in the sheath of the multicore cable (for example, Patent Document 2).

  In recent years, studies have been made to electrify a foot brake device for performing a braking operation while a vehicle is running. Therefore, it has been studied to add a cable for connecting the electronic control unit and the electric footbrake device in the sheath of the multicore cable.

JP 2014-220043 A JP 2014-241286 A

  However, if an attempt is made to simply increase the number of insulated wires in a conventional multicore cable, there is a problem that the outer diameter increases as the number of insulated wires increases, leading to deterioration in flexibility and workability in routing work. In addition, since the outer diameter of the multi-core cable is increased, the amount of resin used for the sheath is increased, leading to an increase in material cost.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a multicore cable for an automobile that can be easily reduced in outer diameter.

One aspect of the present invention includes a plurality of core wires disposed around an axis of a cable;
A sheath covering the plurality of core wires,
Each core wire is
A conductor having a fan-shaped or triangular cross-sectional shape;
An insulating film covering the conductor portion;
A flat surface formed on an outer surface corresponding to the cross-sectional shape of the conductor portion, and the flat surface of each core wire faces the flat surface of the adjacent core wire. It is in the multicore cable for automobiles.
Another aspect of the present invention is the automobile multi-core cable according to the above aspect,
A small-diameter core wire comprising a stranded wire conductor in which a plurality of metal wires are twisted together and an insulating film covering the stranded wire conductor inside one or more core wires of the plurality of core wires. Is located in a multicore cable for automobiles.

  The automobile multicore cable (hereinafter simply referred to as “multicore cable”) has a plurality of core wires each having a conductor portion having a fan-shaped or triangular cross-sectional shape and an insulating film covering the conductor portion. doing. Moreover, each said core wire has the flat surface formed according to the cross-sectional shape of the conductor part in the outer surface. That is, the core wire has a fan-shaped or triangular cross-sectional shape corresponding to the cross-sectional shape of the conductor portion.

  Each said core wire is arrange | positioned around the axis | shaft of the said multi-core cable so that the said adjacent core wire and flat surfaces may face each other. Therefore, for example, when each of the core wires has a fan-shaped cross-sectional shape, these aggregates have a circular cross-sectional shape. Further, for example, when each of the core wires has a triangular cross-sectional shape, these aggregates have a quadrangular or polygonal cross-sectional shape having more than one corner.

  Thus, since the cross-sectional shape of the assembly of the core wires can be a circular shape or a shape close to a circle, the multi-core cable has a depression or a gap in the assembly of the core wires as compared with the conventional multi-core cable. Can be easily reduced. Therefore, the outer diameter of the multicore cable can be easily reduced. Moreover, since the said multicore cable can make the hollow and gap | clearance of the aggregate | assembly of the said core wire small, the quantity of resin used for the said sheath can be reduced easily.

1 is a cross-sectional view of a multicore cable in Example 1. FIG. It is sectional drawing of the conventional multicore cable. It is sectional drawing of the multi-core cable which has a pair of core wire provided with the fan-shaped cross-section in the reference example 1. FIG. It is sectional drawing of the multi-core cable which has two pairs of core wires provided with the triangular-shaped cross-section in the reference example 2. FIG.

  In the multicore cable, the core wire has a fan-shaped or triangular cross-sectional shape. The fan-shaped cross-sectional shape includes a fan shape, that is, a shape surrounded by two radii drawn from the center of a circle and an arc between the two radii, and a corner of the fan is rounded into an arc shape. Shapes are included. The triangle shape includes a triangle and a shape obtained by rounding a corner of the triangle into an arc shape.

  The core wire having a fan-shaped cross-sectional shape is arranged such that the central angle thereof faces the axial side of the multicore cable. Further, the core wire having a triangular cross-sectional shape is arranged so that any one of the corners faces the axial side of the multicore cable.

Conductor portion in the core has a plurality of wires bundle twisted together, each strand bundle, it is preferably composed of a plurality of conductor wires which are twisted together. In this case, the durability of the conductor portion against bending can be further improved. In this case, since the flexibility of the conductor portion is further improved, the obtained multicore cable can be easily bent. As a result, workability in the routing work can be further improved.

  For example, the conductor portion having the above-described structure is formed by twisting a plurality of wire bundles by a conventionally known method, and then performing drawing or compression to form the cross-sectional shape of the conductor portion into a fan shape or a triangular shape. Can be produced.

  As a conductor strand which comprises the said strand bundle, a well-known metal wire can be used for electric wires, such as a copper wire, a copper alloy wire, an aluminum wire, and an aluminum alloy wire. From the viewpoint of improving flexibility and durability against bending, the conductor wire is preferably as thin as possible. For example, a metal wire having a wire diameter of 0.05 to 0.12 mm can be used as the conductor wire.

  The core wire may have a thin core wire arranged inside the insulating film. Thereby, also in the multicore cable in which the core wires having different wire diameters are mixed, the cross-sectional shape of the aggregate of the core wires can be made circular or nearly circular. As a result, the outer diameter can be easily reduced as compared with the conventional multicore cable.

  Further, in this case, disconnection of the thin core wire in the stripping operation of the multicore cable can be easily suppressed. The stripping operation of the multi-core cable includes a step of drawing the sheath after making a cut at the end portion of the sheath. The conventional multi-core cable has a problem that a tensile stress is applied to the core wire as the sheath is pulled out, so that the core wire having a relatively small diameter is likely to break. On the other hand, since the said thin core wire is arrange | positioned inside the insulating film, the said thin core wire and the sheath are not contacting directly. Therefore, the tensile stress applied to the thin core wire when the sheath is pulled out can be reduced, and as a result, disconnection of the thin core wire can be suppressed.

  For example, the thin core wire may be twisted together with the plurality of strands of the core wire. A conventionally well-known insulated wire can be used as a thin core wire. From the viewpoint of flexibility and durability against bending, the small-diameter core wire preferably has a stranded wire conductor in which a large number of metal wires are twisted together and an insulating film covering the stranded wire conductor. .

  The multi-core cable having the above configuration can be used for various applications. For example, the multicore cable can be used to connect an electronic control unit provided on the vehicle body and an electronic component provided on the wheel. In this case, the core wire can be used for connection between the electronic control unit and the electric parking brake device and for connection between the electronic control unit and the electric foot brake device. The thin core wire can be used for connection between an ABS sensor, an electronically controlled suspension, etc., and an electronic control unit, or for monitoring a brake pad thickness.

  In the conventional multicore cable, since the electric wires in the sheath are twisted together, there is a problem that the outer diameter of the multicore cable becomes excessively thick when trying to integrate the cable group used in the above-described application. Therefore, separate cables are actually used to connect each electronic component from the viewpoint of flexibility of the cable and workability in the routing work. However, when the number of cables increases, the number of metal fittings used when fixing the cables to the chassis or the like increases, leading to an increase in the number of parts and an increase in part costs.

  On the other hand, the multi-core cable can integrate the above-described cable group while suppressing an excessive increase in the outer diameter, and thus avoids deterioration of workability in flexibility and routing work. Can be reduced. Therefore, the multi-core cable is suitable for automobiles, and particularly suitable for connection between an electronic control unit provided on a vehicle body and provided on a wheel.

Example 1
Examples of the multicore cable will be described with reference to the drawings. As shown in FIG. 1, the multicore cable 1 has a plurality of core wires 2 (2 a, 2 b) arranged around the axis C and a sheath 3 that covers the plurality of core wires 2. Each core wire 2 includes a conductor portion 21 having a fan-shaped or triangular cross-sectional shape and an insulating film 22 covering the conductor portion 21. Each core wire 2 has a flat surface 23 formed on the outer surface thereof corresponding to the cross-sectional shape of the conductor portion 21. The flat surface 23 of each core wire 2 faces the flat surface 23 of the adjacent core wire 2.

  The outer diameter of the multi-core cable 1 of this example is 12 mm, and has four core wires 2 in the sheath 3. The sheath 3 is made of a urethane resin excellent in wear resistance and flexibility.

  Each core wire 2 has a fan-shaped cross-sectional shape with a central angle θ of 90 degrees as shown in FIG. Each core wire 2 is arranged such that the central angle θ faces the axis C side of the multicore cable 1 in the cross section of the multicore cable 1, and the flat surfaces 23 of the adjacent core wires 2 face each other. Thereby, the assembly 20 of the four core wires 2 has a circular cross-sectional shape.

Two core wires 2a adjacent to each other among the four core wires 2 (2a, 2b) have a conductor portion 21 composed of a plurality of strand bundles 211 twisted together, and each strand bundle 211 is It consists of a number of conductor strands twisted together. In this example, the conductor portion 21a of the two core wires 2a is composed of eight strands 211 (see FIG. 1) and has a conductor cross-sectional area of 2.5 mm ² . Although not shown in the drawing, each strand bundle 211 is formed by bundling 72 copper wires having a diameter of 0.08 mm and twisting them together.

The remaining two core wires 2b among the four core wires 2 have conductor portions 21b composed of a plurality of strand bundles 211 and are arranged inside the insulating film 22 as shown in FIG. A thin core wire 4 is provided. The conductor portion 21b is composed of seven wire bundles 211 and has a conductor cross-sectional area of 2.5 mm ² .

The thin core wire 4 is twisted together with the seven wire bundles 211b constituting the conductor portion 21b. The thin core wire 4 of this example includes a stranded wire conductor 41 having a conductor cross-sectional area of 0.25 mm ² and an insulating film 42 that covers the stranded wire conductor 41. Although not shown in the drawing, the stranded conductor 41 is constituted by twisting 48 copper wires having a diameter of 0.08 mm. Further, the insulating film 42 of the thin core wire 4 is made of polyethylene resin.

  The insulating film 22 of each core wire 2 is made of polyethylene resin.

In the multicore cable 1 of this example, as shown in FIG. 1, the aggregate 20 of the core wires 2 has a circular cross-sectional shape. On the other hand, the conventional multi-core cable 5 has a plurality of core wires 51 twisted together and a sheath 52 that covers the core wires 51. Multi-core cable 5 shown in FIG. 2 for example, comprises a four wire 51a conductor cross-sectional area is 2.5 mm ^2, and two small-diameter core 51b conductor cross-sectional area is 0.25 mm ² Yes.

  The conventional multicore cable 5 shown in FIG. 2 has the same number of conductors and conductor cross-sectional area as the multicore cable 1 of this example. However, the conventional multi-core cable 5 has a larger outer diameter than the multi-core cable 1 of this example because the aggregate 50 of the core wires 51 has the recesses 501 and the gaps 502. In addition, as shown in FIG. 2, the conventional multicore cable 5 inevitably has a recess 501 and a gap 502 formed in the assembly 50 of the core wires 51, so there is a limit to reducing the outer diameter.

  On the other hand, in the multicore cable 1 of this example, since the aggregate 20 of the core wires 2 has a circular cross-sectional shape, the dents and gaps can be easily reduced compared to the conventional multicore cable 5. Therefore, the multi-core cable 1 of the present example can easily reduce the outer diameter.

  Moreover, as is known from a comparison between FIG. 1 and FIG. 2, the multicore cable 1 of this example can easily reduce the amount of resin used for the sheath 3 compared to the conventional multicore cable 5.

  The multi-core cable 1 of this example can be used for connecting an electronic control unit provided on a vehicle body and an electronic component provided on a wheel. Specifically, for example, the core wire 2a that does not have the thin core wire 4 inside can be used to connect the electronic control unit and the electric foot brake device. Moreover, the core wire 2b which has the thin core wire 4 inside can be used in order to connect an electronic control unit and an electric parking brake apparatus. The thin core wire 4 can be used to connect the electronic control unit and the ABS sensor.

  In addition to the ABS sensor, the thin core wire 4 can be used for connection to an electronically controlled suspension or for monitoring the brake pad thickness. Moreover, in this example, although the example of the multi-core cable 1 which has the two small diameter core wires 4 was shown, it is also possible to increase the number of the small diameter core wires 4 further.

  The arrangement of the thin core wire 4 is not limited to the position shown in this example. For example, when the multi-core cable 1 has four thin core wires 4, two thin core wires 4 may be arranged inside the two core wires 2, and each of the four core wires 2. The thin core wires 4 may be arranged one by one.

( Reference Example 1 )
This example is an example of the multicore cable 102 having two core wires 2 (2c, 2d) in the sheath 3. As shown in FIG. 3, the core wires 2c and 2d in this example have a semicircular shape, that is, a fan-shaped cross-sectional shape having a central angle θ of 180 degrees. Each of the core wires 2c and 2d is arranged so that the central angle θ faces the axis C side of the multi-core cable 102 in the cross section of the multi-core cable 102, and the flat surface 23 of the one core wire 2c and the other core wire 2c. The flat surface 23 of the core wire 2d faces.

  Others are the same as in the first embodiment. 3 that are the same as those used in FIGS. 1 and 2 indicate the same components as those in the first embodiment unless otherwise specified.

  Similar to the first embodiment, the multi-core cable 102 of this example can be easily reduced in outer diameter and used for the sheath 3 because the assembly 20 of the core wires 2 has a circular cross-sectional shape. The amount of resin can be easily reduced.

( Reference Example 2 )
This example is an example of the multi-core cable 103 provided with the core wire 6 having a triangular cross-sectional shape. As shown in FIG. 4, the multi-core cable 103 of this example includes four core wires 6 arranged around the axis C and a sheath 3 that covers the four core wires 6. Each core wire 6 includes a conductor portion 61 having a right-angled isosceles triangle cross-sectional shape and an insulating film 62 covering the conductor portion 61. Each core wire 6 has a flat surface 63 formed on the outer surface corresponding to the cross-sectional shape of the conductor portion 61.

  The core wire 6 of this example is arranged so that a right angle faces the axis C side of the multicore cable 103 in the cross section of the multicore cable 103, and the flat surfaces 63 of the adjacent core wires 6 face each other. Thereby, the aggregate 60 of the four core wires 6 has a square cross-sectional shape.

  Others are the same as in the first embodiment. 4 that are the same as those used in FIGS. 1 and 2 indicate the same components as those in the first embodiment unless otherwise specified.

  In the multi-core cable 103 of this example, since the aggregate 60 of the core wires 6 has a square cross-sectional shape, the recesses 501 and the gaps 502 can be easily made smaller than the conventional multi-core cable 5 (see FIG. 2). can do. Therefore, the multi-core cable 103 of this example can easily reduce the outer diameter as well as the first embodiment, and can easily reduce the amount of resin used in the sheath 3.

In Reference Example 1 and Reference Example 2 , the example of the multi-core cables 102 and 103 that do not have the thin core wire 4 inside the core wire 2c or the core wire 6 is shown, but the thin core wire 4 inside the core wire 2c or the like. Can also be arranged.

DESCRIPTION OF SYMBOLS 1,102,103 Multicore cable for motor vehicles 2,6 Core wire 21,61 Conductor part 22,62 Insulation film 23,63 Flat surface 3 Sheath C axis

Claims (3)

A plurality of core wires arranged around the axis of the cable;
A sheath covering the plurality of core wires,
Each core wire is
A conductor having a fan-shaped or triangular cross-sectional shape;
An insulating film covering the conductor portion;
A flat surface formed on the outer surface corresponding to the cross-sectional shape of the conductor portion,
Inside the insulating film in one or more core wires among the plurality of core wires, a small diameter provided with a stranded wire conductor formed by twisting a plurality of metal wires and an insulating film covering the stranded wire conductor The core wire is arranged,
The multi-core cable for an automobile according to claim 1, wherein the flat surface of each core wire faces the flat surface of the adjacent core wire. The conductor portion includes a plurality of wires bundle twisted together,
The multi-core cable for an automobile according to claim 1, wherein each of the strands of the wire is composed of a plurality of conductor strands twisted together.   The multi-core cable for automobiles according to claim 1 or 2, wherein the multi-core cable for automobiles is used for connecting an electronic control unit provided on a vehicle body to an electronic component provided on a wheel. cable.

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