JP2023023525A - conductor wire - Google Patents

Abstract

To provide conductor wire capable of maintaining a bent form.SOLUTION: Conductor wire 1 is formed by twisting a plurality of element conductor wires. The conductor wire 1 has a bend part 5 and straight line parts 7 and 7'. When an interval of points which is a distance of a length of a twisted pitch of the conductor wire 1 from bend end points 6 and 6' which are a boundary between the bent part 5 and the straight line parts 7 and 7' is set as straight line start end ranges 8 and 8' in the straight line parts 7 and 7', inter-line fixing parts 9 and 9' in which the element conductor wires are fixed mutually are formed at least in a part of the straight line start end ranges 8 and 8' on both sides of the bent part 8 in the conductor wire 1. In the bent part 5, the inter-line fixing parts 9 and 9' are not formed in the part of at least 50% of the length in the conductor wire 1. In the inter-line fixing parts 9 and 9', the element conductor wires are welded or caulked in the conductor wire 1.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a conductor wire formed by twisting a plurality of conductor strands and having a bent portion, and more particularly to a conductor wire capable of maintaining a bent shape.

2. Description of the Related Art Conventionally, in a power distribution component that supplies power to a stator coil of a motor (rotating electric machine) mounted in a hybrid vehicle or the like, there has been known one in which the lead frames for each of the U-phase, V-phase, and W-phase are formed by cable harnesses. (See Patent Documents 1 to 3, for example). In this power distribution component, one end of the cable harness is pulled out from a power distribution component main body in which a plurality of cable harnesses corresponding to each phase are grouped, and a power supply terminal is attached to the tip of the pulled out cable harness (hereinafter referred to as the "pull-out harness section"). is provided.

Japanese Patent Application Laid-Open No. 2005-229677 Japanese Patent Laid-Open No. 2007-318923 Japanese Patent No. 6329835

Here, since the power distribution part becomes a so-called strong current path and the rated current is 400A or more and the maximum current is 700A or more, the drawer harness part also needs a corresponding conductor diameter, and the conductor diameter exceeds 5.2 mm. Thick wires are used. Since it is difficult to bend electric wires with such a conductor diameter into a curved shape, it is necessary to bend them in advance to a curved shape that matches the mounting shape, rather than bending them during assembly. be. On the other hand, if the portion to be bent is in the vicinity of the terminal, the insulation coating of the wire is removed for connection with the terminal. If the conductor wire with the insulation coating removed is thick enough to be used in a high current path, it may return to its original shape from a bent state or become untwisted. It was difficult to maintain the bent shape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conductor wire capable of maintaining a bent shape.

In order to achieve the above object, the present invention provides a conductor wire formed by twisting a plurality of conductor element wires, the conductor wire having a bent portion and a straight portion, wherein the straight portion , when the distance between the bending end point, which is the boundary between the bent portion and the straight portion, and the point corresponding to the length of the twist pitch of the conductor wire is defined as a straight line starting end range, the straight line starting points on both sides of the bent portion are At least a portion of the end range is formed with a line-to-line fixing portion to which the conductor wires are fixed to each other.
In addition, it is conceivable that the wire fixing portion is not formed in a portion of 50% or more of the length of the bent portion.
Further, it is conceivable that the conductor strands are welded at the line-to-line fixing portion.
Further, it is conceivable that the conductor wire is crimped at the wire-to-wire fixing portion.
Further, it is conceivable that all the conductor strands are closely fixed to each other without gaps in the inter-wire fixing portion.

According to the present invention, the conductor strands are fixed on both sides of the bent portion. In particular, since the conductor strands are fixed to each other at a position between the twisting of the conductor strands and one turn from the bending end point where the bending ends, the conductor strands do not slip with each other at the bent portion. As a result, the original shape is not restored from the bent shape, and the bent shape can be maintained.

1 is a schematic plan view of a conductor wire according to an embodiment of the present invention; FIG. It is the photograph which concerns on embodiment of this invention, and is a cross-sectional enlarged photograph of the wire|wire fixed part of a conductor wire.

A conductor wire according to an embodiment will be described with reference to FIG. Regarding the conductor element wire made of tin-plated annealed copper wire with a wire diameter of 0.32 mm, one bundle obtained by twisting several tens of conductor element wires at a twist pitch of 35 mm was further twisted at a twist pitch of 100 mm to obtain an outer diameter of 8 mm. Conductor wire 1 was used. An insulating coating 2 made of silicone rubber having a thickness of 0.14 mm is formed around the conductor wire 1 to constitute an insulated wire. Line 1 is exposed.

The end portion of the insulated wire 10 where the conductor wire 1 was exposed was twisted and bent to form a bent portion 5 having a bending radius of 25.5 mm and a bending angle of 90 degrees. Both sides of the bent portion 5 form a straight portion 7, and the boundary between the bent portion 5 and the straight portions 7, 7' is defined as a bend end point 6, 6'. In the present embodiment, the end portion side of the insulated wire 10 from the bending end point 6 becomes the straight portion 7, and the length of this straight portion 7 is 40 mm. Further, the straight portion 7' is formed on the insulating coating 2 side from the bending end point 6', and the length of the straight portion 7' where the conductor wire 1 is exposed is 70 mm. Also, the length of the bent portion 5 is 40 mm.

As described above, in the present embodiment, the twist pitch of the conductor wire 1 is 100 mm. The straight line initial end range 8' is a range of 100 mm from the bending end point 6' to the straight line portion 7' side.

For such a conductor wire 1, welding (compacting) is performed while compressing a range of 11 mm from the bending end point 6 to the straight portion 7 side and a range of 11 mm from the bending end point 6' to the straight portion 7' side. , the conductor strands of the conductor wire 1 are fixed to each other to form wire-to-wire fixing portions 9, 9'. In FIG. 1, the inter-wire fixing portions 9, 9' are portions indicated by a plurality of parallel oblique lines.

The conductor wire 1 in which the bent portion 5 was formed in this manner was able to maintain the bent shape without restoring the original shape from the bent shape, and the twist did not come loose.

Further, since the wire fixing portions 9 and 9' are not formed in the bent portion 5, there is room for moderate deformation in the bent portion 6 as well. Alignment is also facilitated.

FIG. 2 shows a cross-sectional photograph of the inter-wire fixing portion 9. As shown in FIG. As shown in FIG. 2, in this embodiment, all the conductor wires are fixed to each other in the wire fixing portions 9, 9'. Therefore, the conductor strands do not slip and move, and the bent shape and twist can be reliably maintained. Moreover, the conductor wire 1 formed by twisting conductor strands has a problem that water or oil penetrates in the longitudinal direction through the conductor strands due to capillary phenomenon. In the conductor wire 1 according to the present embodiment, the inter-wire fixing portions 9, 9' can block entry of water and oil.

The present invention is not limited to the above embodiments, and for example, the following are conceivable.

The material and twist configuration of the conductor wire can be appropriately designed according to the intended use and purpose. For example, as the material of the conductor element wire, in addition to the above tin-plated annealed copper wire, wires made of various conductor materials such as nickel-plated annealed copper wire, annealed copper wire, copper alloy wire, aluminum alloy wire, and stainless steel wire can be used. can be done. In particular, the present invention exhibits excellent effects when the conductor wire is thick or when a material having a strong restoring force is used as the conductor wire.

The bending radius and bending angle of the bent portion can also be appropriately designed according to the intended use and purpose. Moreover, the bending shape of the bent portion may be not only a circular arc shape but also various curved shapes such as a sinusoidal curve and a clothoid curve. Bent portions may be formed at a plurality of locations on the conductor wire, and in that case, line-to-line fixing portions are formed at predetermined locations on both sides of each bent portion. Moreover, when the distance between the plurality of bent portions is smaller than the twist pitch, only one interline fixing portion may be formed between the plurality of bent portions.

Welding as in the above embodiment is most commonly used to form the line-to-line fixing portion, but other forms may also be used. For example, so-called crimping, soldering, brazing, fixing with an adhesive, or friction stir welding may be used. Also, in the case of welding, various welding methods such as arc welding, gas welding, resistance welding, and laser welding may be appropriately used.

The position where the wire-to-wire fixing portion is formed is the straight line initial end range between points corresponding to the length of the twist pitch of the conductor wire from the bending end point, which is the boundary between the bending portion and the straight portion. Here, the twist pitch of the conductor wire indicates the length of one turn of the twist. based on the It suffices if the line fixing part covers even a part of this straight line starting end range. It may be formed, or the line-to-line fixing portion may be formed up to the portion of the straight portion beyond the straight start end range. However, it is preferable that the wire fixing portion is not formed in a portion of 50% or more of the length of the bent portion, and it is more preferable that the wire fixing portion is not formed in the bent portion. If the range in which the wire fixing portion is formed in the bent portion becomes large, the room for deformation of the bent portion becomes small, which may hinder alignment when assembling the conductor wire to another member. It should be noted that the position where the wire-to-wire fixing portion is formed is preferably a position closer to the end point of the bend, and the line between the point that is half the length of the twist pitch of the conductor wire from the end point of the bend. It is particularly preferred that an inter-line fixing portion is formed, and most preferably an inter-line fixing portion is formed at the bending end point. In the case of a combination of multiple twist pitches, such as conjugate twist, it is particularly preferable to use the length of the shortest twist pitch as a reference.

It is not necessary that all the conductor strands are fixed to each other in the line-to-line fixing portion, but the standard is that 90% or more of the total number of the conductor strands are fixed. If it is less than 90%, there will be a portion where slippage occurs between the conductor strands, so there is a possibility that the bending shape will be partially loosened or the twist will collapse. Of course, it is most preferred that all conductor strands are attached to each other.

Moreover, the conductor wire of the present invention may be coated with an arbitrary coating. For example, an insulated wire from which the insulation coating has been removed at a predetermined location, a wire covered with an insulating tube or the like afterward, and a wire in which a plurality of conductor wires are collectively covered are also examples of the conductor wire of the present invention. Conceivable.

As described in detail above, the conductor wire according to the present invention can reliably maintain its bent shape. Such conductor wires can be suitably used as lead wires and power lines for various devices such as rotary electric machines, home appliances, and industrial machines.

REFERENCE SIGNS LIST 1 conductor wire 2 insulation coating 5 bending portion 6, 6' bending end point 7, 7' straight portion 8, 8' straight line initial end range 9, 9' fixed portion between lines 10 insulated wire

Claims (5)

A conductor wire formed by twisting a plurality of conductor strands,
The conductor wire has a bent portion and a straight portion,
In the straight portion, when a straight line initial end range is defined as a distance between a bending end point, which is a boundary between the curved portion and the straight portion, and a point corresponding to the length of the twist pitch of the conductor wire,
A conductor wire, wherein a wire fixing portion for fixing the conductor element wires to each other is formed in at least a part of the straight initial end range on both sides of the bent portion. 2. The conductor wire according to claim 1, wherein said bending portion has no inter-line fixing portion formed in a portion of 50% or more of the length thereof. 3. The conductor wire according to claim 2, wherein the conductor element wire is welded at the wire fixing portion. 3. The conductor wire according to claim 2, wherein the conductor wire is crimped at the inter-wire fixing portion. 5. The parallel electric wire according to any one of claims 1 to 4, wherein all the conductor element wires are closely fixed to each other without gaps in the inter-wire fixing portion.

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