JP2014137876A - Stranded wire conductor, cable and method of producing stranded wire conductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a stranded wire conductor to bending and stability of the shape.SOLUTION: A stranded wire conductor consists of a plurality of layers of a plurality of conductor element wires stranded together, and at least adjacent two layers, among the layers of the conductor element wires, have the same stranding direction and different stranding angles. Mutual contact of element wires between adjacent layers is reduced, and penetration of element wires of an outer layer into a clearance between adjacent element wires in an inner layer is suppressed, leading to improvement of durability of the stranded wire conductor to bending and stability of the shape. A cable consisting of the stranded wire conductor coated with an insulator is thus improved in durability to bending and stability of shape.

Description

  The present invention relates to a technique for twisting a plurality of strands.

  2. Description of the Related Art Conventionally, covered electric wires in which an outer periphery of a conductor is covered with an insulator are widely used for wiring such as vehicles such as automobiles and electric / electronic devices. As this conductor, a stranded wire conductor in which a plurality of metal strands are twisted in a plurality of layers may be used.

  In order to stabilize the shape of the stranded wire conductor, those twisted so that the respective twist directions of the center layer and the outer layer are opposite to each other are widely used. In such a stranded conductor, there is a problem that wear due to contact between strands twisted in opposite directions occurs in the bent portion, and the wire is easily disconnected.

  Patent Document 1 discloses a covered electric wire in which an outer periphery of a collective stranded wire in which a plurality of child stranded wires are twisted in the same twisting direction over three layers is covered with an insulator. Each strand wire is formed by twisting a plurality of strands. Since the child strands in each of the adjacent layers of the aggregate strand are twisted in the same twist direction, wear due to contact with each other is reduced. For this reason, durability to bending at the bent portion is improved.

JP 2010-129405 A

  However, in the covered electric wire of Patent Literature 1, the strands of the outer layer enter the gap between the strands of the strands that constitute the center layer of the adjacent layers, so that the assembly strand is in the length direction. The outer diameter fluctuates along, and the shape becomes unstable. For this reason, in the coating stripping treatment of the coated electric wire, there is a problem that the blade hits the strand of the aggregated stranded wire and the strand is damaged.

  And this is not limited to a covered electric wire covered with a stranded wire conductor in which a plurality of strands are twisted in the same twist direction over a plurality of layers, but a plurality of strands are spread over a plurality of layers in the same twist direction. This is also a problem that occurs in a covered electric wire in which a twisted wire conductor is covered.

  The present invention has been made to solve these problems, and provides a technique capable of improving the durability against bending of a covered electric wire in which an insulator is coated on a stranded wire conductor and the stability of the shape. Objective.

  In order to solve the above problem, the stranded wire conductor according to the first aspect is a stranded wire conductor obtained by twisting a plurality of conductor strands into a plurality of layers, and at least two of the plurality of layers adjacent to each other. The twist directions of the layers are the same, and the twist angles are different.

  The twisted wire conductor according to the second aspect is the twisted wire conductor according to the first aspect, and the difference between the twist angles of the two layers is 4.5 degrees or more.

  The twisted wire conductor according to the third aspect is the twisted wire conductor according to the first or second aspect, and, of the two layers, the twist angle of the outer layer is larger than the twist angle of the inner layer. large.

  The stranded wire conductor according to the fourth aspect is the stranded wire conductor according to the first or second aspect, and, of the two layers, the twist angle of the outer layer is more than the twist angle of the inner layer. small.

  The stranded wire conductor according to a fifth aspect is the stranded wire conductor according to any one of the first to fourth aspects, wherein the two layers are an outermost layer and a layer adjacent to the inner side of the outermost layer. It is.

  The covered electric wire according to the sixth aspect includes an insulating covering layer on the outer periphery of the stranded wire conductor according to any one of the first to fifth aspects.

  The manufacturing method of the stranded wire conductor which concerns on a 7th aspect is a manufacturing method of a multi-layered stranded wire conductor, Comprising: A plurality of conductor strands are twisted together, and one layer other than the outermost layer is formed among the plurality of layers. And a plurality of conductor strands in contact with the first layer of the plurality of layers by twisting the conductor wires around the one layer in the same twist direction as the twist direction of the one layer at different twist angles. Forming an outer layer.

  According to any one of the first to seventh aspects, the twisted conductors have the same twist direction in at least two layers adjacent to each other among the plurality of layers, and have different twist angles. As a result, the contact between the adjacent wires between adjacent layers is reduced, and the strands of the outer layer are prevented from entering the gap between adjacent wires in the inner layer. The durability to bending and the stability of the shape can be improved. Therefore, it is possible to improve the durability to bending of the covered electric wire in which the stranded wire conductor is covered with the insulator and the stability of the shape.

  According to the second aspect of the invention, the difference between the twist angles of the two adjacent layers can be set so that the outer layer strands are less likely to enter due to the gap between the inner layer strands, The shape stability can be further improved while suppressing the deterioration of the durability to bending of the covered electric wire in which the stranded wire conductor is covered with the insulator.

  According to the invention relating to the third aspect, since the twist angle of the outer layer is larger than the twist angle of the inner layer, the twist angle of the outer layer is larger than the twist angle of the inner layer. The pitch of the outer layer having a larger number of strands to be twisted can be made shorter. Accordingly, the flexibility of the stranded wire conductor can be improved.

  According to the fourth aspect of the invention, since the twist angle of the outer layer is smaller than the twist angle of the inner layer, the pitch of the outer layer having a larger number of strands to be twisted can be made longer. Therefore, since the quantity of the strand required for manufacture of a stranded wire conductor can be reduced, the manufacturing cost of a stranded wire conductor can be suppressed.

  According to the fifth aspect of the invention, the two layers adjacent to each other are the outermost layer and the layer adjacent to the inner side of the outermost layer. And the stability of the shape can be further improved.

  According to the sixth aspect of the invention, since the insulating wire is formed on the outer periphery of the stranded wire conductor, the covered wire can improve the durability against bending of the covered wire and the stability of the shape. Therefore, in the stripping process of the covered electric wire, it is possible to reduce the damage of the strands due to the contact with the blade.

  According to the seventh aspect of the invention, a plurality of conductor strands are twisted to form one layer other than the outermost layer of the plurality of layers, and the plurality of conductor strands are arranged around the one layer. The outer layer in contact with the one layer is formed by twisting together at different twist angles in the same twist direction as the one layer. Therefore, it is possible to improve the bending resistance and shape stability of the manufactured stranded wire conductor, as well as the bending resistance and shape stability of the covered electric wire in which the stranded wire conductor is coated with an insulator. And improve.

It is a section perspective view which illustrates the composition of the stranded wire conductor concerning an embodiment. It is a side view which illustrates the composition of the stranded wire conductor concerning an embodiment. It is sectional drawing which illustrates the structure of the stranded wire conductor which concerns on embodiment. It is a schematic diagram which illustrates the pitch of the stranded wire conductor which concerns on embodiment. It is a side view which illustrates the composition of the covered electric wire concerning an embodiment. It is a figure for demonstrating the twist of the strand wire conductor which concerns on embodiment. It is a figure which illustrates the external appearance of the stranded wire conductor which concerns on embodiment. It is a figure for demonstrating the twist of the strand wire conductor which concerns on a reference technique. It is a figure which shows the external appearance of the strand wire conductor which concerns on a reference technique. It is the schematic which shows the manufacturing apparatus of the layer of the center side of a strand wire conductor. It is the schematic which shows the manufacturing apparatus of the outer layer of a strand wire conductor. It is a flowchart which illustrates the manufacturing process of a strand wire conductor.

<About embodiment:>
The stranded wire conductor according to the embodiment will be described. The stranded wire conductor according to the embodiment is a stranded wire in which a plurality of conductor strands (also simply referred to as “element wires”) are twisted into a plurality of layers, and has electrical conductivity. In the present embodiment, a three-layer twisted conductor 200 in which 19 strands are twisted will be described as an example (see FIGS. 1 to 3), but a plurality of strands in which a plurality of strands are twisted together. Any conductor may be used. As the element wire, a copper alloy wire such as aluminum, annealed copper or hard copper, or another alloy wire is used. Moreover, the covered electric wire which concerns on embodiment is equipped with the coating layer (it is also called an "insulation coating layer") of the insulator on the outer periphery of the stranded wire conductor which concerns on embodiment. In the present embodiment, a covered electric wire 400 in which an outer periphery of a stranded wire conductor 200 is covered with an insulating coating layer 300 is shown as an example (see FIG. 5).

  The stranded wire conductor 200 includes an inner (center side) two-layer stranded wire conductor 16 and an outer layer (also referred to as “outermost layer”) adjacent to the outer side of the stranded wire conductor 16. The inner stranded wire conductor 16 is composed of seven strands 12, and the outer stranded conductor 17 is composed of twelve strands 13. The wire 12 and the wire 13 have the same wire diameter. The stranded wire conductors 16 and 17 are usually cut with their end faces substantially aligned (see FIG. 5). However, in FIGS. In order to show the difference in twisting of the wires, the one end surface of the stranded wire conductor 17 is shown to be located closer to the center side in the longitudinal direction of the stranded wire conductor 200 than the one end surface of the stranded wire conductor 16.

  In the multi-layered stranded wire conductor according to the embodiment, at least two layers adjacent to each other among the plurality of layers have the same twist direction (also referred to as “twist direction”), and the twist angles are different from each other. . Specifically, in the stranded conductor 200, each strand 12 of the stranded conductor 16 is twisted in the A1 direction at a twist angle θ1, and each strand 13 of the stranded conductor 17 is twisted at an angle θ2. It is twisted in the A1 direction. The twist angles θ1 and θ2 are different from each other (see FIG. 2).

  The layer core diameter of the stranded wire conductor 16 is D1, and the layer core diameter of the stranded wire conductor 17 is D2 (see FIGS. 3 and 4). Moreover, an example of the path | route of each strand 12 which comprises the stranded conductor 16 is the path | route 51, for example, and the example of the path | route of each strand 13 which comprises the stranded conductor 17 is the path | route 52, for example. The pitch of each strand 12 of the stranded conductor 16 (also referred to as “twist pitch”) is P1, and the pitch of each strand 13 of the stranded conductor 17 is P2 (see FIG. 4). The twist angles θ1 and θ2 (unit: degree) are given by the equations (1) and (2), respectively.

  For example, when the difference between the twist angle of the strand of the inner twisted conductor 18 in the twisted conductor 201 according to the reference technology and the twist angle of the strand 19 of the outer twisted conductor in contact with the twisted conductor 18 is small. In this case, the strands of the outer layer enter (become in) the gaps between the strands of the stranded conductor 18 (see FIG. 8). As a result, the outer diameter of the stranded wire conductor 201 varies along the length direction of the stranded wire conductor 201 in which the outer layers are twisted together, resulting in an unstable shape in which the outer shape is wavy (see FIG. 9). In the example of FIG. 9, the inner layer pitch is 75 mm, the outer layer pitch is 80 mm, the inner layer twist angle is 3.1 degrees, and the outer layer twist angle is 5.7 degrees. The difference in twist angle is 2.6 degrees. The wire diameter of each strand of the stranded wire conductor 201 is 1 mm.

  On the other hand, in the stranded wire conductor 200 according to the embodiment, the difference between the twist angle of the strand of the inner stranded wire conductor 16 and the twist angle of the strand 13 of the outer stranded wire conductor in contact with the stranded wire conductor 16 is larger. Therefore, the strands of the outer layer are prevented from entering the gaps between the strands of the stranded conductor 16 (see FIG. 6). Thereby, the fluctuation | variation of the outer diameter along the length direction of the strand wire conductor 200 by which the outer layer was twisted together is suppressed, and an external appearance shape is stabilized (refer FIG. 7). The greater the difference in pitch between the stranded wire conductor 16 that is the stranded wire on the center side and the stranded wire conductor 17 that is the stranded wire of the outer layer, the greater the angle difference between the twist angles of the stranded wire conductors 16 and 17, The strands of the stranded wire conductor 17 are less likely to enter the gaps between the strands of the stranded wire conductor 16. In the example of FIG. 7, the inner layer pitch is 75 mm, the outer layer pitch is 50 mm, the inner layer twist angle is 3.1 degrees, and the outer layer twist angle is 9.2 degrees. The difference in twist angle is 6.1 degrees. The wire diameter of each strand of the stranded conductor 200 is 1 mm.

  In addition, in the stranded wire conductor 200, the stranded wire conductor 16 and the stranded wire conductor 17 are twisted in the same direction A1 although the twist angles are different. The friction between the strands between the two is reduced compared to the case where the twist directions are different from each other. Therefore, in the stranded wire conductor 200, the durability to bending is further improved as compared with the stranded wire conductor twisted in the same direction. Moreover, although the twist angle differs from the twisted wire conductor 16 and the twisted wire conductor 17, since the influence of the contact between the strands between layers is reduced since they are twisted in the same direction, the twist angles coincide with each other. Compared to the case, the durability to bending does not deteriorate significantly. The stranded wire conductor 16 and the stranded wire conductor 17 may be twisted together in a right-handed manner, or may be twisted leftward with respect to each other.

  For example, when aluminum is adopted as the strand of the stranded conductor 200, the strand is softer and weaker than, for example, a copper strand. For this reason, the twisted conductor made of aluminum strands is more susceptible to wear due to friction between the strands when bent than the twisted conductor made of copper strands. It is easier to disconnect. Accordingly, the present invention is particularly effective when applied to a stranded conductor composed of an aluminum strand, but the present invention is applied to a stranded conductor 200 having a conductor other than aluminum as a strand. However, the usefulness of the present invention is not impaired.

  Since the appearance shape (finished shape) of the stranded conductor 200 becomes more stable as the difference in twist angle between the inner layer and the adjacent outer layer becomes larger, the difference in twist angle is, for example, 4.5 degrees or more. It is more preferable that the angle is 6 degrees or more. Thus, when the twist angle θ2 of the outer twisted wire conductor 17 is larger than the twist angle θ1 of the inner twisted wire conductor 16 of the twisted wire conductor 200, the outer layer has a larger number of strands to be twisted together. The pitch of a certain stranded wire conductor 17 can be made shorter. Therefore, the flexibility (easy to bend) of the stranded wire conductor 200 can be enhanced.

  In addition, by making the twist angle θ2 of the outer stranded wire conductor 17 smaller than the twist angle θ1 of the inner stranded wire conductor 16, the difference between the two twist angles is made a predetermined angle or more. The external shape of the conductor 200 may be stabilized. In this case, since the twist angle θ2 is smaller than the twist angle θ1, the pitch of the outer layer having a larger number of strands to be twisted can be made longer. Therefore, since the amount of strands required for manufacturing the stranded wire conductor 200 can be reduced, the manufacturing cost of the stranded wire conductor 200 can be suppressed.

  In the covered electric wire 400, an insulator such as a resin material is covered as an insulating coating layer 300 on the outer periphery of the stranded conductor 200 (see FIG. 5). In addition, in the covered electric wire 400 shown in FIG. 5, a part of the insulating covering layer 300 is peeled off by a blade or the like at one end thereof. The length of the coating to be peeled varies depending on the type of the electric wire, but is set to 10 mm to 20 mm, for example. In the stranded wire conductor 200, the stability of the shape is improved while the deterioration of the flexibility is suppressed. Therefore, the stability of the shape of the covered electric wire 400 in which the stranded wire conductor 200 is coated with the insulating coating layer 300 is also improved while the deterioration of the flexibility is suppressed. Therefore, in the stripping process of the covered electric wire 400, the damage of the strands due to the blade hitting can be reduced. Further, by improving the stability of the shape of the stranded wire conductor 200, when the insulating coating layer 300 is coated on the stranded wire conductor 200 and the covered electric wire 400 is formed, bumps in the covered electric wire 400 are reduced.

  Next, the manufacturing method of the stranded wire conductor which concerns on embodiment is demonstrated. In the present embodiment, an example in which 19 strands are twisted to produce a three-layer twisted conductor 200 will be described. However, a plurality of strands are twisted to produce a multiple-layer twisted conductor. If that is the case. An insulating resin or the like is extrusion coated on the outer periphery of the stranded wire conductor. That is, the stranded wire conductor is used as a core wire of an electric wire.

  10 and 11 are schematic views showing manufacturing apparatuses 20 and 120 for manufacturing the stranded conductor 200, respectively. The manufacturing apparatus 20 is used for manufacturing the two layers of the stranded conductor 16 on the center side of the stranded conductor 200, and the manufacturing apparatus 120 is an outer layer of the stranded conductor 17, that is, the outer side of the stranded conductor 16. Is used to manufacture a stranded conductor that is twisted adjacent to the stranded conductor 16.

  The manufacturing apparatus 20 mainly includes a strand supply unit 22, a strand guide unit 24, an assembly die 28, an arcuate twisting mechanism 32, a die 40, and a conductor winding unit 44. First, a plurality of strands 12 forming two layers on the center side of the stranded conductor 200 are drawn out from the strand supply section 22, fed to the assembly die 28 through the strand guide section 24, and assembled. Is done. Thereafter, the assembly conductor 14 is twisted together as a two-layer twisted wire conductor 16 on the center side by the bow-shaped twisting mechanism 32, and then wound and accommodated in the conductor winding portion 44 through the die 40. The conductor winding unit 44 that accommodates the stranded wire conductor 16 is delivered to the stranded wire manufacturing apparatus 120.

  The manufacturing apparatus 120 mainly includes a stranded wire supply unit 121, a strand supply unit 122, a strand guide unit 124, an assembly die 128, an arcuate twisting mechanism 132, a die 140, and a conductor winding unit 144. In preparation. First, the two layers of the stranded wire conductor 16 on the center side are drawn out from the conductor winding portion 44, and the plurality of strands 13 forming the outer layer stranded wire conductor 17 are drawn out from the strand supply portion 122 and assembled. Is done. The diameters of the wire 12 and the wire 13 are equal to each other. Thereafter, the collective conductor 114 is twisted as the stranded wire conductor 200 by the bow-shaped twisting mechanism 132, and then wound and accommodated in the conductor winding portion 144 through the die 140.

  More specifically, the strand supply unit 22 of the manufacturing apparatus 20 includes a plurality of (here, seven) reels 23 each of which winds and houses a plurality (here, seven) of strands 12. Yes. The plurality of strands 12 may be wound and accommodated on a single reel 23. As the strand supply part 22, what is necessary is just a structure which can supply the several strand 12 continuously.

  The strand guide part 24 is formed in a plate shape having a plurality of guide holes. The guide holes are formed in a number corresponding to the plurality of strands 12 to be twisted, and are formed so as to be distributed around the center of the strand guide portion 24 (preferably at equal intervals). A plurality of strands 12 pass through the guide holes, and the strands 12 that have passed through the guide holes around the center are dispersed around the strands 12 that pass through the center guide holes. It is fed toward the die 28.

  The assembly die 28 has holes for allowing the plurality of strands 12 to pass through in an assembled state. The opening of the hole is formed to have a diameter enough to insert a plurality of assembled strands 12, for example, the same diameter as a minimum inclusion circle that can include a cross section of the plurality of strands 12 or a larger diameter. Yes. Then, the plurality of strands 12 that have passed through the strand guide section 24 are assembled into one conductor 14 when being introduced toward the opening on one end side of the hole of the assembly die 28. In addition, when many strands 12 are collected, the strands 12 may be gathered sequentially in multiple places.

  The arcuate twisting mechanism 32 includes an arcuate conductor guide 34 and a rotation drive unit 36 that rotationally drives the arcuate conductor guide 34 around a predetermined rotation axis X.

  The arcuate conductor guide 34 is configured to support the conductor 14 so as to be fed along an arcuate path. As such an arcuate conductor guide 34, a configuration in which a groove capable of guiding the conductor 14 is formed on the outward surface of an arcuate rod-shaped member, or a configuration in which a guide ring is provided can be employed. . In short, the arcuate conductor guide 34 may be configured to support the conductor 14 so as to be fed along the arcuate path.

  In the present embodiment, the plurality of strands 12 are twisted together by the bow-shaped twisting mechanism 32, but this is not always necessary. For example, the structure which twists the strand 12 by rotating at least one of the strand supply part 22 and the conductor winding part 44 may be sufficient.

  The rotation drive unit 36 supports the arcuate conductor guide 34 so that it can be driven to rotate around a line (string) connecting both ends thereof. Here, the rotation axis of the arcuate conductor guide 34 by the rotation drive unit 36 exists on the extension of the hole axis of the collective die 28. More specifically, both end portions of the arcuate conductor guide 34 are supported by a bearing portion 37 so as to be rotationally driven, and at least one end portion thereof is rotationally driven by a motor or the like. A guide roller 38 a is provided at one end of the arcuate conductor guide 34, and a guide roller 38 b is provided at the other end of the arcuate conductor guide 34. The guide roller 38 a is a fixed roller that does not rotate synchronously with the arcuate conductor guide 34, and the guide roller 38 b is a movable roller that rotates around the rotation axis X in synchronization with the arcuate conductor guide 34. The conductor 14 that has passed through the collecting die 28 is guided toward one end of the arcuate conductor guide 34 through the guide roller 38a, and is guided along the arcuate shape along the arcuate conductor guide 34.

  When the conductor 14 is guided toward the other end of the arcuate conductor guide 34, the conductor 14 is reversed via the guide roller 38 b and is guided along the rotation axis X of the arcuate conductor guide 34. When the conductor 14 is guided along the arcuate conductor guide 34 as described above, the arcuate conductor guide 34 rotates around the rotation axis X, so that the conductor 14 including the plurality of strands 12 becomes the arcuate conductor guide. It is twisted at two places on both end sides of 34. That is, the conductor 14 is twisted together at a location K1 where the conductor 14 is guided from the fixed guide roller 38a to the arcuate conductor guide 34. Further, after the conductor 14 is led out from the movable guide roller 38b at the other end side of the arcuate conductor guide 34 while being reversed, the conductor 14 is twisted at a position K2 reaching the die 40. That is, in this apparatus, the conductor 14 is twisted at two places, and the two-layer stranded wire conductor 16 on the center side of the stranded wire conductor 200 is manufactured.

  The die 40 has a hole for allowing the stranded conductor 16 to pass therethrough. Here, the die 40 is disposed in the rotation locus of the arcuate conductor guide 34 in a posture in which the axis of the hole coincides with the rotation axis X of the arcuate conductor guide 34. The opening of the hole is formed to have a diameter to which the conductor 14 assembled by the collecting die 28 can be inserted, for example, the same diameter as the minimum inclusion circle that can include the cross section of the conductor 14 or a diameter larger than that. Yes. Then, the stranded wire conductor 16 that has passed through the hole of the die 40 is wound and accommodated in a conductor winding portion 44 provided in the rotation locus of the arcuate conductor guide 34. The conductor winding unit 44 in which the stranded conductor 16 is accommodated is detached from the manufacturing apparatus 20 and attached to the manufacturing apparatus 120.

  In the stranded conductor manufacturing apparatus 20, the plurality of strands 12 are twisted as follows. First, the plurality of strands 12 supplied from the strand supply section 22 are guided to the holes of the assembly die 28 through the plurality of guide holes of the strand guide section 24 and are assembled into one conductor 14. . That is, the some strand 12 which comprises the twisted line | wire conductor 16 which is two layers of the center side among the stranded line | wire conductors 200 is collected (step S110 of FIG. 12). Then, the conductor 14 is drawn out toward the arcuate twisting mechanism 32 and guided to the arcuate twisting mechanism 32.

  The conductor 14 guided to the arcuate twisting mechanism 32 is first twisted at a point K1 guided to the arcuate conductor guide 34 from the guide roller 38a on the fixed side. Thereafter, the conductor 14 is led out from the movable guide roller 38b on the other end side of the arcuate conductor guide 34 while being reversed, and then twisted again at a position K2 reaching the die 40, whereby the center of the stranded conductor 200 is obtained. The side stranded wire conductor 16 is processed (step S120 in FIG. 12). The said process step is a step which twists the several strand 12 and forms one layer other than the outermost layer among the several layers of the twisted-wire conductor 200. FIG. At this time, the number of revolutions per hour of the bow-shaped twisting mechanism 32 and the speed at which the conductor 14 is drawn out are adjusted, and the stranded wire conductor 16 has a predetermined pitch in a predetermined twist direction (first twist direction) A1. P1 and the twist angle (first twist angle) θ1 are twisted together. In addition, as the manufacturing apparatus 20, an apparatus having a configuration in which the conductor 14 in which a plurality of strands 12 are gathered may be twisted only at one place.

  The stranded wire supply unit 121 of the manufacturing apparatus 120 includes a conductor winding unit 44 around which the stranded wire conductor 16 manufactured in the manufacturing apparatus 20 is wound, and a twist back mechanism 139. The stranded conductor 16 accommodated in the conductor winding portion 44 is drawn out toward a guide hole provided in the central portion of the strand guide portion 124. The untwisting mechanism 139 supports the conductor winding portion 44 from which the stranded wire conductor 16 is drawn out so as to be rotatable around a rotation axis (X axis) along the drawing direction of the stranded wire conductor 16. In parallel with the rotational operation of the twisting mechanism 132, the conductor winding portion 44 is rotated at the same rotational speed per unit time in the direction opposite to the rotational direction of the arcuate twisting mechanism 132. As a result, the twisted wire conductor 16 twisted by the bow-shaped twisting mechanism 132 is twisted back. By twisting back, variation in pitch of the stranded wire conductor 16 when the outer layer is twisted around the stranded wire conductor 16, that is, variation in twist angle is suppressed.

  The strand supply unit 122 includes a plurality (here, 12) of reels 123 that respectively wind up and accommodate a plurality (here, 12) of strands 13. The plurality of strands 13 may be wound and accommodated on a single reel 123. As the strand supply part 122, what is necessary is just a structure which can supply the several strand 13 continuously.

  The strand guide part 124 is formed in a plate shape having a plurality of guide holes. The guide holes are formed by combining a plurality of strands 13 that are twisted together and processed into the stranded wire conductor 17 that is the outer layer of the stranded wire conductor 200, and the stranded wire conductor 16. It is formed so as to be distributed around the center and around the center (preferably at equal intervals). The twisted conductor 16 passes through the center guide hole, and the plurality of strands 13 pass through the guide holes around the center, so that the guide around the center passes around the twisted conductor 16 passing through the center guide hole. The strands 13 that have passed through the holes are fed toward the collective die 128 in a dispersed state.

  The assembly die 128 has holes for allowing the stranded wire conductor 16 and the plurality of strands 13 to pass through in an assembled state. The opening of the hole has a diameter that allows the assembled stranded conductor 16 and the plurality of strands 13 to be inserted, for example, the same diameter as a minimum inclusion circle that can include a cross section of the stranded conductor 16 and the plurality of strands 13. Or it is formed in a larger diameter. When the strand conductor 16 and the plurality of strands 13 that have passed through the strand guide portion 24 are introduced toward the opening on the one end side of the hole of the assembly die 128, the strands are assembled into one conductor 114. In addition, when many strands 13 are collected, the strands 13 may be gathered sequentially in multiple places.

  The arcuate twisting mechanism 132 includes an arcuate conductor guide 134 and a rotation driving unit 136 that rotationally drives the arcuate conductor guide 134 about a predetermined rotation axis X.

  The arcuate conductor guide 134 is configured to support the conductor 114 so as to be fed along an arcuate path. As such an arcuate conductor guide 134, an arcuate conductor guide having the same configuration as the arcuate conductor guide 34 of the manufacturing apparatus 20 is employed.

  In the present embodiment, the plurality of strands 13 are twisted around the twisted conductor 16 by the bow-shaped twisting mechanism 132, but this is not always necessary. For example, the structure which twists the strand 13 by rotating at least one of the strand supply part 122 and the conductor winding part 144 may be sufficient.

  The rotation drive unit 136 supports the arcuate conductor guide 134 so that the arcuate conductor guide 134 can be driven to rotate about a line (string) connecting both ends thereof. Here, the rotation axis of the arcuate conductor guide 134 by the rotation drive unit 136 exists on the extension of the hole axis of the collective die 128. More specifically, both ends of the arcuate conductor guide 134 are rotatably supported by the bearing portion 137, and at least one end thereof is rotationally driven by a motor or the like. A guide roller 138 a is provided at one end of the arcuate conductor guide 134, and a guide roller 138 b is provided at the other end of the arcuate conductor guide 134. The guide roller 138 a is a fixed roller that does not rotate in synchronization with the arcuate conductor guide 134, and the guide roller 138 b is a movable roller that rotates about the rotation axis X in synchronization with the arcuate conductor guide 134. Then, the conductor 114 passing through the collecting die 128 is guided toward one end of the arcuate conductor guide 134 through the guide roller 138a, and is guided along the arcuate shape along the arcuate conductor guide 134. When the conductor 114 is guided toward the other end of the arcuate conductor guide 134, the conductor 114 is reversed via the guide roller 138 b and is guided along the rotation axis X of the arcuate conductor guide 134.

  As described above, when the conductor 114 is guided along the arcuate conductor guide 134, the arcuate conductor guide 134 rotates around the rotation axis X, so that the conductor 114 including the plurality of strands 13 becomes the arcuate conductor guide. Twisted at different twist angles in the same direction as the twist direction of the stranded conductor 16 at two locations on both ends of 134. That is, the conductor 114 is twisted together at a location K3 where the conductor 114 is guided from the fixed guide roller 138a to the arcuate conductor guide 134. Further, after the conductor 114 is led out from the movable guide roller 138 b on the other end side of the arcuate conductor guide 134 while being reversed, the conductor 114 is twisted at a location K 4 reaching the die 140. In parallel with the twisting operation of the conductor 114 by the arcuate conductor guide 134, the two layers of the twisted conductor 16 on the center side of the twisted conductor 200 are untwisted in the direction opposite to the direction in which the conductor 114 is twisted. The fluctuation of the pitch P1 of the stranded conductor 16 due to the twisting performed on the conductor 114 is suppressed, and the fluctuation of the twist angle θ1 is suppressed. That is, in this apparatus, the conductor 114 is twisted at two locations while being twisted back with respect to the stranded wire conductor 16, thereby forming a plurality of strands constituting the stranded wire conductor 17 of the outer layer of the stranded wire conductor 200. 13 is wound around the stranded wire conductor 16 to produce the stranded wire conductor 200.

  The die 140 has a hole for allowing the stranded conductor 200 to pass therethrough. Here, the die 140 is disposed in the rotation locus of the arcuate conductor guide 134 in a posture in which the axis of the hole coincides with the rotation axis X of the arcuate conductor guide 134. The opening of the hole is formed to have a diameter that allows the conductor 114 assembled by the collecting die 128 to be inserted, for example, a diameter that is the same as or larger than a minimum inclusion circle that can include a cross section of the conductor 114. Yes. Then, the stranded wire conductor 200 that has passed through the hole of the die 140 is wound and accommodated in a conductor winding portion 144 provided in the rotation locus of the arcuate conductor guide 134.

  In the twisted wire conductor manufacturing apparatus 120, the twisted wire conductor 16 and the plurality of strands 13 are twisted as follows. First, the stranded wire conductor 16 supplied from the stranded wire supply unit 121 and the plurality of strands 13 supplied from the strand supply unit 122 pass through the plurality of guide holes of the strand guide unit 124 to collect the die. It is led to 128 holes and assembled into one conductor 114. That is, a plurality of strands 13 constituting the stranded wire conductor 17 of the outer layer of the stranded wire conductor 200 are assembled (step S130 in FIG. 12). Then, the conductor 114 is drawn out toward the arcuate twisting mechanism 132 and guided to the arcuate twisting mechanism 132.

  The conductor 114 guided to the arcuate twisting mechanism 132 is first twisted at a position K3 guided to the arcuate conductor guide 134 from the guide roller 138a on the fixed side. Thereafter, the conductor 114 is led out from the movable guide roller 138b on the other end side of the arcuate conductor guide 134 while being reversed, and then twisted again at a location K4 reaching the die 140 (step S140 in FIG. 12). In this processing step, a plurality of strands 13 are twisted around the inner-layer twisted wire conductor 16 in the same twist direction as the twist direction of the twisted wire conductor 16 at a different twist angle θ2, so that the twisted wire conductor 200 is twisted. This is a step of forming an outer layer in contact with the stranded wire conductor 16 among the plurality of layers.

  During this process, the number of rotations per hour of the arcuate twisting mechanism 132 and the speed at which the conductor 114 is drawn out are adjusted so that the stranded conductor of the outer layer of the stranded conductor 200 has the same twist direction as the stranded conductor 16. A1 is twisted together at a predetermined pitch P2 and a twist angle (second twist angle) θ2. The pitches P1 and P2 are different from each other, and the twist angles θ1 and θ2 are also different from each other. On the other hand, in parallel with the twisting of the conductor 114 by the arcuate twisting mechanism 132, the twisted wire conductor 16 is twisted back by the twisting back mechanism 139 of the twisted wire supply unit 121. A plurality of strands 13 are twisted around the stranded wire conductor 16 where fluctuations in the twist angle θ1 are suppressed, and are twisted at a different twist angle θ2 in the same direction as the stranded direction of the stranded wire conductor 16. 13 is processed into the stranded wire conductor 17 of the outer layer of the stranded wire conductor 200. In addition, as the manufacturing apparatus 120, an apparatus having a configuration in which the conductor 114 in which a plurality of strands 13 are gathered around the stranded wire conductor 16 is twisted only at one place may be employed.

  According to the stranded wire conductor according to the present embodiment as described above, in the stranded wire conductor, at least two layers adjacent to each other among the plurality of layers have the same twist direction and different twist angles. As a result, the contact between the adjacent wires between adjacent layers is reduced, and the strands of the outer layer are prevented from entering the gap between adjacent wires in the inner layer. The durability to bending and the stability of the shape can be improved. Therefore, it is possible to improve the durability to bending of the covered electric wire in which the stranded wire conductor is covered with the insulator and the stability of the shape.

  Further, according to the stranded wire conductor according to the present embodiment as described above, the difference in twist angle between the two adjacent layers is caused by the gap between the strands of the inner layer and the strands of the outer layer. Since it can set so that it may be difficult, the stability of a shape can be improved more, suppressing the deterioration of the durability to the bending of the covered electric wire by which the insulation was coat | covered with the twisted-wire conductor.

  Further, according to the stranded wire conductor according to the present embodiment as described above, the outer layer has a larger twist angle of the outer layer than the twist angle of the inner layer. Can be made shorter. Accordingly, the flexibility of the stranded wire conductor can be improved.

  Further, according to the stranded wire conductor according to the present embodiment as described above, the outer layer has a larger number of strands to be twisted because the twist angle of the outer layer is smaller than the twist angle of the inner layer. Can be made longer. Therefore, since the quantity of the strand required for manufacture of a stranded wire conductor can be reduced, the manufacturing cost of a stranded wire conductor can be suppressed.

  Further, according to the stranded wire conductor according to the present embodiment as described above, the two layers adjacent to each other are the outermost layer and the layer adjacent to the inner side of the outermost layer. Thus, durability against bending and shape stability can be further improved.

  Further, according to the coated electric wire according to the present embodiment as described above, since the insulating coating layer is formed on the outer periphery of the stranded wire conductor according to the present embodiment, the durability to the bending of the coated electric wire and the shape Stability and can be improved. Therefore, in the stripping process of the covered electric wire, it is possible to reduce the damage of the strands due to the contact with the blade.

  Moreover, according to the manufacturing method of the strand wire conductor which concerns on this embodiment as mentioned above, one layer other than the outermost layer is formed among the plurality of layers by twisting a plurality of conductor strands, and a plurality of conductors By twisting the strands around the one layer in the same twist direction as the one layer at different twist angles, an outer layer in contact with the one layer is formed. Therefore, it is possible to improve the bending resistance and shape stability of the manufactured stranded wire conductor, as well as the bending resistance and shape stability of the covered electric wire in which the stranded wire conductor is coated with an insulator. And improve. Further, by improving the stability of the shape of the stranded wire conductor, the forming becomes easier when the insulated wire is formed by covering the stranded wire conductor with the insulating coating layer.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention. For example, as the multi-layered twisted conductors according to the embodiment, twisted conductors in which the twisting directions are the same and the twisting angles are different from each other, and an outer layer is formed on the outer side of two adjacent layers may be adopted.

200 Twisted wire conductor 300 Insulation coating layer 400 Insulated wire 12, 13 Elementary wire 20, 120 Manufacturing device 16 Twisted wire conductor 17 Twisted wire conductor A1 direction D1, D2 Layer core diameter P1, P2 Pitch θ1, θ2 Twist angle

Claims (7)

A stranded conductor in which a plurality of conductor strands are twisted into a plurality of layers,
Twisted wire conductors in which at least two layers adjacent to each other among the plurality of layers have the same twist direction and different twist angles. The stranded conductor according to claim 1,
A twisted conductor having a twist angle difference of 4.5 degrees or more between the two layers. The stranded conductor according to claim 1 or 2, wherein
Of the two layers, a twisted wire conductor in which the twist angle of the outer layer is larger than the twist angle of the inner layer. The stranded conductor according to claim 1 or 2, wherein
Of the two layers, a twisted wire conductor in which the twist angle of the outer layer is smaller than the twist angle of the inner layer. The stranded wire conductor according to any one of claims 1 to 4, wherein
The two layers are a stranded wire conductor that is an outermost layer and a layer adjacent to the inner side of the outermost layer.   A covered electric wire comprising an insulating coating layer on the outer periphery of the stranded wire conductor according to any one of claims 1 to 5. A method for producing a multi-layered stranded wire conductor,
Twisting a plurality of conductor wires to form one layer other than the outermost layer among the plurality of layers;
By twisting a plurality of conductor strands around the one layer in the same twist direction as the one layer at different twist angles, an outer layer in contact with the one layer among the plurality of layers is formed. Forming step;
A method for producing a stranded wire conductor.

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