JP2012249506A - Protection structure of flat wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a position shift of a flat corrugated tube in an axis line direction without winding an adhesive tape around juxtaposed three flat electric wires extracted from a front end of the flat corrugated tube.SOLUTION: Three flat electric wires 1 obtained by coating a conductor 2 having a cross-section rectangular shape and having a cross sectional area of 10 mmor more with an insulation coating material 3, and coating the insulation coating material 3 by a metal braided wire 5 are juxtaposed as a three-phase power line connecting an inverter and a motor of a vehicle with each other, and has a total width (d) of 35 mm or more in a parallel state. Terminal materials 4 connected with the respective flat electric wires 1 terminal are in parallel. A flat corrugated tube 10 is external-packaged to the juxtaposed three flat electric wire 1 group from a position separated from a connection position with the terminal materials 4 by a distance of 100 to 150 mm. An adhesive tape 14 is wound from a front end of the flat corrugated tube 10 in an axis line direction continuously over a length of 250 mm or more.

Description

  The present invention relates to a protection structure for a flat electric wire, and more specifically, the position of the flat corrugated tube in the axial direction without wrapping an adhesive tape around three flat electric wires arranged in parallel that are drawn from the tip of the flat corrugated tube that is an exterior material. This is to prevent deviation.

  Conventionally, in order to connect an inverter and a motor of a hybrid vehicle or an electric vehicle, a power supply harness in which three round electric wires 100 are converged has been used [see Japanese Patent Laid-Open No. 2001-136632 (Patent Document 1)]. . As shown in FIG. 5, the round electric wire 100 is gathered in a three-ply shape, covered with a cylindrical metal braided wire 101 that is a shield material on the outer periphery, and further has a circular cross-section that is an exterior material on the outer periphery. In many cases, a round corrugated tube 102 is covered and wired between the devices. At this time, in order to prevent the positional displacement of the round corrugated tube 102 in the axial direction, as shown in FIG. Subsequently, the adhesive tape 103 is wound from the tip of the round corrugated tube 102 in the tube axis direction, and the three round electric wires 100 and the tip of the round corrugated tube 102 are fixed.

  On the other hand, a plurality of stranded wires 105a formed by converging a large number of metal strands in parallel with the stranded wire of the round electric wire 100 are formed in parallel to form a strip-like conductor 105 having a rectangular cross section, and the conductor 105 is covered with an insulation coating. The flat electric wire 104 as shown in FIG. 7 covered with the material 106 can set the conductor cross-sectional area to be small with respect to the rated current value. It becomes. Therefore, instead of the round electric wire 100 of FIG. 5, a power supply harness having three flat electric wires 104 arranged in parallel as shown in FIG. 7 is formed, and a metal braided wire 107 and a flat corrugated tube 108 are put on the outer periphery of the harness. The wiring between the inverter and the motor is advantageous in terms of heat dissipation performance, weight, and cost reduction, and is also effective in that the height of the wiring space can be reduced.

JP 2001-136632 A

  However, in order to prevent the displacement of the flat corrugated tube 108 in the axial direction, as in the case of the round electric wire, the three flat electric wires 104 arranged in parallel and drawn from the tip of the flat corrugated tube 108 are used as a lower winding. When the adhesive tape is wound, the flat electric wires 104 arranged side by side move in the width direction and the flat electric wires 104 are easily overlapped with each other. When the flat electric wires 104 overlap with each other, the electric wires 104 exchange heat with each other, and thus there is a possibility that good heat dissipation performance cannot be obtained.

  The present invention is capable of preventing displacement of the flat corrugated tube in the axial direction with a simple structure without winding an adhesive tape around the three parallel electric wires drawn out from the tip of the flat corrugated tube that is an exterior material. It is an issue.

In order to solve the above-mentioned problem, the present invention is a three-phase power supply line that is mounted on a vehicle and connects an inverter and a motor, and a conductor having a rectangular cross section and a cross sectional area of 10 mm ² or more is coated with an insulating coating material. Three flat electric wires in which the insulating coating material is covered with a shield material made of a metal braided wire are used,
The three flat wires are juxtaposed and the total width (d) in the juxtaposed state is 35 mm or more, and the terminal materials connected to the ends of the flat wires are juxtaposed,
One flat corrugated tube is sheathed on the three flat electric wire groups arranged side by side from a position at a distance of 100 mm to 150 mm from the connection position with the terminal material,
An adhesive tape is continuously wound about 250 mm or more in the axial direction from the tip of the flat corrugated tube in order to prevent opening of one slit continuous in the axial direction provided in the flat corrugated tube. An adhesive tape is not wound around the flat electric wire drawn from the tip, and a flat electric wire protection structure is provided.

As described above, the inverter and motor of the vehicle are connected by the three flat electric wires arranged side by side, and the conductor covered with the insulating coating material of the flat electric wire has a cross-sectional rectangular shape of 10 mm ² or more, and the metal braid By making the total width (d) of the three flat electric wires arranged in parallel with the wire 35 mm or more, it becomes possible to stably supply power from the inverter to the motor, and from a round electric wire having equivalent heat dissipation performance. Since the conductor cross-sectional area can be reduced, the weight and cost can be reduced. In particular, the cross-sectional area of the conductor of each flat electric wire is 10 to 14 mm ^2, and the total width (d) of the three flat electric wires arranged side by side covered with the metal braided wire is 35 to 45 mm, It is preferable that the thickness (t) of each covered flat electric wire is 5.5 to 6.5 mm.

  Moreover, in this invention, it is set as the structure which winds an adhesive tape continuously 250 mm or more from the front-end | tip of the flat corrugated tube coat | covered by the said three flat electric wire groups coat | covered with the metal braided wire in the tube axial direction. With this configuration, the opening of the slit continuously provided in the axial direction of the flat corrugated tube is prevented, and the flat corrugated tube around which the adhesive tape is wound is bent inwardly on the outer peripheral surface of the flat electric wire group. Since it adheres closely, the fixing force of the said flat electric wire group and a flat corrugated tube can also be heightened. Specifically, it is pulled out from the tip of a round corrugated tube having a circular cross section by simply winding an adhesive tape continuously at least 250 mm in the tube axis direction from the tip of a flat corrugated tube that is externally mounted on the three flat electric wire groups arranged side by side. More than the fixing force when the adhesive tape is wound around the round wire of 3 pieces and then wound in the tube axis direction from the tip of the corrugated tube to fix the three round wires and the tip of the round corrugated tube. It was found that a fixing force of can be obtained. Therefore, the axial displacement of the flat corrugated tube can be easily prevented and good heat dissipation performance can be maintained without the need to wrap the adhesive tape around the three parallel electric wires drawn out from the tip of the flat corrugated tube. . When the winding dimension in the axial direction of the adhesive tape is less than 250 mm, the fixing force between the three flat electric wire groups arranged in parallel and the flat corrugated tube may be insufficient. From the viewpoint of workability and cost, it is preferable that the winding dimension of the adhesive tape in the axial direction is about 250 to 300 mm.

  The method of winding the adhesive tape to wind 250 mm or more in the axial direction from the tip of the flat corrugated tube is not particularly limited as long as the adhesive tape can be continuously wound, and the adhesive tape may be spirally wound without any gap, or half wrap It may be wound. Moreover, it is preferable that the adhesive tape is partially wound at a necessary interval, except for a region where the adhesive tape is continuously wound in the axial direction from the tip of the flat corrugated tube by 250 mm or more.

  In addition, by covering the flat corrugated tube from the position 100 to 150 mm away from the terminal material connection position of the flat wire terminal as described above, the flat wire and peripheral members, etc., routed between the inverter and the motor While preventing interference effectively, the flexibility of the portion close to the terminal material connection position in the flat electric wire can be ensured, and the wiring and connection workability to the motor side and the inverter side can be improved.

  The conductor of each of the flat electric wires is formed by arranging a plurality of circular stranded wires formed by twisting one thick conductive metal plate or metal wire in parallel to form a rectangular cross section. It consists of a high-current electric wire with a value of 50 to 100 amperes, and the shield materials of the flat wires adjacent to each other in parallel are in contact with each other or continuously covering the three flat wire groups It is preferable.

  The flat corrugated tube is made of an extruded resin molded product, a pair of wide portions corresponding to the total width (d) of the three flat electric wires arranged side by side, and the thickness (t) of each flat electric wire. Each of which includes a pair of narrow bent portions, a flat tube is formed by the wide portions and the narrow bent portions, annular crests and troughs are alternately provided in the axial direction, and one of the above It is preferable that the slit is provided over the entire length in the narrow bent portion or one wide portion.

  As described above, the size of the pair of wide corrugated tubes is made equal to the total width (d) of the three flat electric wires arranged side by side covered with the metal braided wire, and the width of the pair of flat corrugated tubes By making the dimension of the narrow part correspond to the thickness (t) of each flat electric wire covered with the metal braided wire, the flat corrugated tube can be brought into close contact with the three flat electric wire groups arranged side by side. While improving heat dissipation performance, the position shift to the axial direction of a flat corrugated tube can also be prevented effectively.

  As described above, in the present invention, a vehicle inverter and a motor are connected by three parallel electric wires arranged in parallel, and a flat corrugated tube is sheathed on the three flat electric wires arranged in parallel and covered with a metal braided wire. At the same time, an adhesive tape is continuously wound around the end of the flat corrugated tube in the tube axis direction by 250 mm or more. The tape winding around the flat corrugated tube prevents the opening of the slit continuously provided in the axial direction of the flat corrugated tube, and the flat corrugated tube wound with the adhesive tape is bent inward and flattened. Since it is in close contact with the outer peripheral surface of the electric wire group, the fixing force between the flat electric wire group and the flat corrugated tube can also be increased. Therefore, the axial displacement of the flat corrugated tube can be easily prevented and good heat dissipation performance can be maintained without winding the adhesive tape around the three parallel electric wires drawn out from the tip of the flat corrugated tube.

The protection structure of the flat electric wire in embodiment of this invention is shown, (A) is a top view, (B) is the sectional view on the AA line of (A). It is a perspective view which shows a flat corrugated tube. It is explanatory drawing which shows the measuring method of the fixing force (F) of the three flat electric wires of the side-by-side state covered with the metal braided wire, and a flat corrugated tube. The wrapping dimension (X) of the adhesive tape from the tip of the flat corrugated tube in the tube axis direction, and the fixing force (F) between the three flat electric wires covered in parallel with the metal braided wire and the flat corrugated tube It is a graph which shows a relationship. It is a figure which shows a prior art example. It is a figure which shows a prior art example. It is a figure which shows a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of the present invention. In the present embodiment, three flat electric wires 1 as shown in FIG. 1 are used as a three-phase power line for connecting an electric vehicle motor and an inverter (not shown). The flat electric wire 1 is a conductor 2 having a rectangular cross section by arranging a plurality of circular strands 2a (seven in this embodiment) having a circular cross section in which a large number of metal strands are converged, and the conductor 2 is an insulating coating. 3 is formed. The cross-sectional area of the conductor 2 of the flat electric wire 1 is 10 to 14 mm ² (14 mm ^{2 in} this embodiment), and the allowable current value is 50 to 100 amperes (60 amperes in this embodiment). The three flat electric wires 1 are juxtaposed in the width direction without any gaps, the terminal members 4 connected to the ends of the respective flat electric wires 1 are arranged in parallel, and the outer peripheral surface of the three flat electric wires 1 arranged in parallel is a shielding material. Covered with a cylindrical metal braided wire 5. The metal braided wire 5 is formed by braiding a tin-plated annealed copper wire in a mesh shape, and the total width (d) of the three flat electric wires 1 covered with the metal braided wire 5 is 35 to 45 mm (main) In the embodiment, the thickness (t) of each flat electric wire 1 covered with the metal braided wire 5 is set to 5.5 to 6.5 mm (5.5 mm in this embodiment). In this embodiment, the three flat electric wires 1 arranged side by side are continuously covered with the metal braided wires 5, but the metal braided wires covered by the flat electric wires 1 are brought into contact with each other and arranged in parallel. Also good.

  A flat corrugated tube is formed on three flat electric wires 1 arranged in parallel and covered with a metal braided wire 5 from a position opened by a dimension L = 100 to 150 mm (in this embodiment, L = 100 mm) from the connection position with the terminal material 4. 10 (see FIG. 2). The flat corrugated tube 10 is made of an extruded resin molded product, and includes a pair of wide portions 10a corresponding to the total width (d) of the three flat electric wires 1 arranged side by side covered with the metal braided wire 5, and a metal braid. A flat cylinder is constituted by a pair of narrow bent portions 10b corresponding to the thickness (t) of each flat electric wire 1 covered with the wire 5, and annular crests 11 and troughs 12 are alternately provided in the axial direction. In addition, a slit 13 is provided over the entire length in the axial direction of one narrow bent portion 10b. By providing the slit 13 in the flat corrugated tube 10, the flat corrugated tube 10 can be easily attached from the side of the flat electric wires 1 provided side by side.

  In order to prevent the opening of the slit 13, as shown in FIG. 1 (A), from the tip of the flat corrugated tube 10 sheathed on the three flat electric wires 1 arranged side by side covered with the metal braided wire 5, The adhesive resin 14 made of vinyl resin is continuously wrapped in the tube axial direction by half-wrapping, and the dimension X for continuously winding the adhesive tape 14 in the axial direction is 250 mm or more (in this embodiment, X = 250 mm). On the other hand, no adhesive tape is wound around the three flat electric wires 1 arranged side by side drawn from the tip of the flat corrugated tube 10. 1A shows only one end side connected to the motor, the same applies to the other end side connected to the inverter. Further, the adhesive tape 15 is partially wound at a necessary interval except for the region where the adhesive tape 14 is continuously wound.

  As described above, the inverter and the motor of the electric vehicle are connected by the three flat electric wires 1 arranged in parallel, and the flat corrugated tube 10 is externally attached to the three flat electric wires 1 covered by the metal braided wire 5. At the same time, the adhesive tape 14 is continuously wound around the end of the flat corrugated tube 10 in the tube axis direction by 250 mm or more. By winding the tape around the flat corrugated tube, the opening of the slit 13 provided in the axial direction of the flat corrugated tube 10 is prevented, and the flat corrugated tube 10 around which the adhesive tape 14 is wound is bent inward and arranged side by side. Since the three flat electric wires 1 are in close contact with the outer peripheral surface, the fixing force between the three flat electric wires 1 and the flat corrugated tube 10 can be increased. Therefore, the axial displacement of the flat corrugated tube 10 can be prevented and good heat dissipation performance can be maintained even without winding the adhesive tape around the three flat electric wires 1 arranged side by side drawn from the tip of the flat corrugated tube 10. .

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.
[Examples 1 to 3, Comparative Examples 1 and 2]
A flat wire protection structure similar to that of the above embodiment was formed, and only the winding dimension (X) of the adhesive tape 14 from the tip of the flat corrugated tube 10 in the tube axis direction was changed. That is, in Comparative Example 1, X = 100 mm, in Comparative Example 2, X = 200 mm, in Example 1, X = 300 mm, in Example 2, X = 400 mm, and in Example 3, X = 500 mm. (X) was increased by 100 mm, and the fixing force (F) between the three flat electric wires 1 arranged in parallel and covered with the metal braided wire 5 and the flat corrugated tube 10 was measured. As shown in FIG. 3, the fixing force (F) is obtained by fixing the terminal material 4 on one end side of each flat wire 1 with a pin 6, while holding the flat corrugated tube 10 with a clamp 20 a of a tensile tester 20. It is obtained by pulling to the other end side (in the direction of the arrow) and measuring the tensile force until the flat corrugated tube 10 is detached from the three flat electric wires 1 arranged in parallel. The result is shown in the graph shown by the solid line in FIG.

On the other hand, after the adhesive tape is wound down on a three-ply round electric wire (conductor cross-sectional area: 20 mm ² ) covered with a metal braided wire drawn from the tip of a round corrugated tube (inner diameter 22 mm) having a circular cross section, the adhesive The tape is wound from the tip of the round corrugated tube in the tube axis direction to fix the three round electric wires and the tip of the round corrugated tube (see FIG. 6). The measured value was about 45 N (the vertical axis value of the graph indicated by the alternate long and short dash line in FIG. 4).

As shown in FIG. 4, the fixing force between the three flat electric wires 1 covered with the metal braided wire 5 and the flat corrugated tube 10 is the same as that of the round electric wire and the round corrugated tube by the conventional fixing method when X = 250 mm. In Examples 1 to 3, which were equal to the fixing force and exceeded X = 250 mm, the fixing force between the flat electric wire 1 and the flat corrugated tube 10 exceeded the fixing force by the conventional fixing method. Therefore, it is clear that the positional deviation in the axial direction of the flat corrugated tube 10 can be prevented without winding an adhesive tape around the three flat electric wires 1 arranged in parallel drawn out from the tip of the flat corrugated tube 10.
On the other hand, since Comparative Example 1 and Comparative Example 2 satisfy X <250 mm, the fixing force between the flat electric wire 1 and the flat corrugated tube 10 is less than the fixing force according to the conventional fixing method, and a sufficient fixing force cannot be obtained. .

DESCRIPTION OF SYMBOLS 1 Flat electric wire 2 Conductor 2a Stranded wire 3 Insulation coating material 4 Terminal material 5 Metal braided wire 10 Flat corrugated tube 10a Wide part 10b Narrow bending part 11 Mountain part 12 Valley part 13 Slit 14, 15 Adhesive tape 20 Tensile test machine d Metal Total width t of three flat wires covered side by side with braided wire thickness T of each flat wire covered with metal braided wire L Dimension from terminal material connection position to tip of flat corrugated tube X Tip of flat corrugated tube Adhesive tape winding dimension from tube to tube axis

Claims (3)

As a three-phase power supply line that is mounted on a vehicle and connects an inverter and a motor, a conductor having a rectangular cross-section and a cross-sectional area of 10 mm ² or more is covered with an insulation coating material, and the insulation coating material is a shield made of a metal braided wire Three flat wires covered with material are used,
The three flat wires are juxtaposed and the total width (d) in the juxtaposed state is 35 mm or more, and the terminal materials connected to the ends of the flat wires are juxtaposed,
One flat corrugated tube is sheathed on the three flat electric wire groups arranged side by side from a position at a distance of 100 mm to 150 mm from the connection position with the terminal material,
While preventing the opening of one slit continuous in the axial direction provided in the flat corrugated tube, an adhesive tape is continuously wound about 250 mm or more in the axial direction from the tip of the flat corrugated tube, while the tip of the flat corrugated tube An adhesive tape is not wound around the flat electric wire drawn out from the flat electric wire protection structure. The conductor of each of the flat electric wires is formed by arranging a plurality of circular stranded wires formed by twisting one thick conductive metal plate or metal wire in parallel to form a rectangular cross section. It consists of a high current wire with a value of 50 to 100 amps,
The flat electric wire according to claim 1, wherein the three flat electric wire groups adjacent in parallel are continuously covered with the shielding material, or the shielding materials of the flat electric wires are arranged in contact with each other. Protective structure.   The flat corrugated tube is made of an extruded resin molded product, and corresponds to a pair of wide portions corresponding to the total width (d) of the three flat electric wires arranged side by side and the thickness (t) of each flat electric wire. A flat tube is formed by the wide portion and the narrow bend portion, annular crest portions and trough portions are alternately provided in the axial direction, and one of the narrow bend portions is formed. The flat wire protective structure according to claim 1 or 2, wherein the slit is provided over the entire length in the bent portion or one of the wide portions.

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