JP4133347B2 - Conductive path and shield member with shield function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conductive path having a shield function and a shield member constituting the conductive path.
[0002]
[Prior art]
For example, when connecting devices such as an inverter device and a motor in an electric vehicle, a conductive path having a shield function is used. As this type of conductive path, the wire side terminal is fixed to the end of the conductor of the shielded wire, the wire side terminal is connected to the device side terminal provided in the shield case of the device, and the shield layer of the shielded wire Is connected to the shield case via a conductive connecting member (see, for example, Patent Document 1).
[0003]
However, in such a conductive path, the work of inserting the wire side terminal into the shield case and the work of connecting the connecting member to the shield case must be repeated as many times as the number of terminals (ie, the number of shielded wires). There is a problem that it takes time and effort.
Therefore, using a wire that does not have a shield layer, these wires are collectively covered with a flexible cylindrical shield member made of braided wire, and a wire side terminal is fixed to each wire. Can be considered. According to this collective shield type conductive path, the work of connecting the shield function portion (shield member) to the shield case is performed only once regardless of the number of wires, so that workability is improved.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-26093
[Problems to be solved by the invention]
The shield member can be flexibly deformed by braiding a plurality of fine metal wires, thereby facilitating the work of inserting the electric wire into the shield member or arranging the electric wire even if the electric wire is bent and arranged. There is an advantage that the route can be followed. On the other hand, however, when a foreign object hits the shield member, the gap between the fine metal wires easily expands, and the gap increases to cause a reduction in shield function.
[0006]
For this reason, conventionally, exterior means for covering the shield member with a corrugated tube or the like is provided in order to prevent foreign matter interference with the shield member. However, when the gap is accommodated in the corrugated tube in a state in which the gap between the fine metal wires is enlarged, the shielding function remains impaired even though the interference of foreign matter can be avoided.
The present invention has been made in view of the above circumstances, and aims to prevent the gap between the fine metal wires constituting the shield member from being enlarged.
[0007]
[Means for Solving the Problems]
The invention of claim 1 includes a plurality of electric wires and a shield member having a tubular braided wire obtained by knitting a plurality of fine metal wires in a mesh shape, and the plurality of electric wires are inserted into the shield member. The shield member is integrally surrounded by the shield member, and the shield member is made of an elastic material and is integrated in a form in which the metal thin wires are connected to the braided wire. Elastic coupling means is provided, and the elastic coupling means is made of a conductive material and is provided so as to impregnate or cover the gaps of the fine metal wires. The braided wire is knitted into a mesh shape, and both the inner and outer surfaces of the braided wire are covered with an elastic connection layer comprising the elastic connection means.
[0008]
The invention of claim 2 is a shield member having a cylindrical braided wire in which a plurality of fine metal wires are knitted in a mesh shape, and a plurality of electric wires are inserted to collectively surround the electric wires , and is elastic The elastic connecting means is integrated with the braided wire so that the fine metal wires are connected to each other, and the elastic connecting means is made of a conductive material, and the fine metal wire. of provided so as to or covering impregnated with clearance, said clearance, the thin metal wires are stitches of the braided wire formed by weaving into a mesh, both surfaces of the inner and outer periphery of the braided wire The structure is covered with an elastic connection layer comprising the elastic connection means.
[0009]
In the first and second aspects, the elastic connecting means closes the gap between the fine metal wires. The elastic connecting means enters the gap between the fine metal wires and impregnates the braided wire, or the elastic connecting means is the braided wire. Without being impregnated with the braided wire, it can be in a form of being adhered in a layered manner along the surface of the braided wire.
[0010]
[Action and effect of the invention]
[Invention of Claims 1 and 2 ]
Even if an external force is applied to the braided wire due to wire insertion work or foreign object interference, the gap between the fine metal wires temporarily expands, but when the external force is removed, the gap between the fine metal wires is removed by the elastic connecting means. Since it returns to the narrowed state, the gap between the fine metal wires is prevented from remaining enlarged.
[0011]
Further, since the elastic connecting means has conductivity and is provided so as to close the gap between the fine metal wires, the shielding function is exhibited even if the density of the fine metal wires is lowered. Therefore, it is possible to reduce the cost and weight by the amount that the amount of use has decreased with the decrease in the density of the fine metal wires.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
A first embodiment embodying the present invention will be described below with reference to FIGS.
[0013]
The conductive path A having a shield function of the present embodiment is used as means (wire harness) for connecting devices such as an inverter device and a motor in an electric vehicle, for example.
The device 10 includes a device main body 12 and three device-side terminals 13 extended from the device main body 12 in a conductive shield case 11. The device-side terminal 13 is a plate-like member called a bus bar, and has a bolt hole 14 penetrating in the vertical direction. The three device-side terminals 13 are arranged so as to be horizontally aligned with a predetermined interval in the left-right direction. Further, on the side wall of the shield case 11, three circular attachment holes 15 are formed side by side so as to correspond to the respective device side terminals 13.
[0014]
Next, the conductive path A will be described. The conductive path A includes a plurality of electric wires 20, electric wire side terminals 25, an exterior body 30, a shield member 35, and a shield shell 40.
The electric wire 20 has an outer periphery of a conductor (not shown) surrounded by an insulating coating 21, and unlike the shielded electric wire, the electric wire 20 is not provided with a shield layer. The electric wire side terminal 25 is connected to the terminal part of each electric wire 20, respectively.
At the front end portion of the electric wire side terminal 25, a device connecting portion 26 having a long flat plate shape in the front-rear direction and having a bolt hole 27 penetrating vertically is formed. The conductor of the electric wire 20 is connected to the electric wire crimping portion (not shown) at the rear end portion of the electric wire side terminal 25 so as to be conductive by crimping.
[0015]
The exterior body 30 is integrally formed with the electric wire side terminal 25 by a resin mold so as to surround the electric wire crimping portion of the electric wire side terminal 25 and the terminal portion of the electric wire 20. A device connecting portion 26 protrudes from the front end surface of the exterior body 30, and a portion of the electric wire 20 covered with the insulating coating 21 is led out from the rear end surface. The outer periphery of the rear end portion of the outer package 30 is a circular portion concentric with the electric wire 20, and a seal ring 32 is attached to the seal groove 31 on the outer peripheral surface.
[0016]
The shield member 35 includes a tubular braided wire 36 in which a plurality of fine metal wires 36a are knitted in a mesh shape, and an elastic connecting member 37 (an elastic connecting means that is a constituent of the present invention) that also has a cylindrical shape. The cylindrical shield member 35 is configured to collectively surround the three electric wires 20.
The braided wire 36 can be slightly expanded and contracted in the radial direction and the length direction due to the flexibility of the thin metal wire 36a. In this embodiment, the end of the braided wire 36 (shield member 35) has a shape that expands in a tapered shape, but the braided wire 36 may have a constant diameter over the entire length. .
[0017]
The braided wire 36 is integrated with an elastic connecting member 37 that is made of an elastic material and connects the metal thin wires 36 a to the braided wire 36. This elastic connecting member 37 is along the inner periphery and the outer periphery of the braided wire 36, and is continuous over the entire length of the braided wire 36 (shield member 35), and has a continuous sheet shape in the circumferential direction. In this embodiment, silicone rubber is used as the elastic connecting member 37. The elastic connecting member 37 is made of carbon rubber (not shown) mixed in silicone rubber, and the elastic connecting member 37 has conductivity due to the carbon fiber.
The characteristics of silicone rubber are as follows. The rubber hardness is 30 to 70 HS, the volume resistivity is 10 ⁰ to 10 ⁻³ Ω · cm, the tensile strength is 40 kgf / cm ² or more, and the heat resistance temperature is −40 to 150 ° C.
[0018]
When the elastic connecting member 37 is integrated with the braided wire 36, the braided wire 36 is covered with the pipe 38a, and the braided wire 36 is covered with the exterior pipe 38b, thereby braiding the gap between the pipes 38a, 38b. Accommodates line 36. At this time, the radial gap between the pipes 38 a and 38 b is larger than the thickness of the braided wire 36. Then, liquid silicone rubber is injected into the gap between the pipes 38a and 38b, and the silicone rubber is soaked into the gap 36b of the fine metal wire 36a. After curing, when the silicone rubber is cured, the braided wire 36 and the elastic connecting member 37 are integrated, and the shield member 35 is completed. In such an integrated state, the elastic connecting member 37 is filled in the gap 36b of the fine metal wires 36a, thereby connecting the fine metal wires 36a. When the elastic connecting member 37 is cured, the shield member 35 may be extracted from the gap between the pipes 38a and 38b.
[0019]
Since the elastic connecting member 37 is made of elastic silicone rubber, when the braided wire 36 is deformed by receiving an external force, the elastic connecting member 37 is flexibly deformed following the braided wire 36 while maintaining the state in which the fine metal wires 36a are connected to each other. In addition, even when the gap 36b of the fine metal wire 36a is enlarged, the metal fine wire 36a can be flexibly deformed following the enlargement of the gap 36b between the fine metal wires 36a while maintaining the state where the fine metal wires 36a are connected.
[0020]
When the external force applied to the braided wire 36 is released, the elastic connecting member 37 connecting the metal thin wires 36a can restore the braided wire 36 to the original shape by the elastic restoring force of the silicone rubber, The gap 36b between the fine metal wires 36a can be narrowed and restored.
Furthermore, on both the inner and outer surfaces of the braided wire 36, single elastic connecting layers 37a and 37b made only of silicone rubber not including the metal thin wire 36a are formed, and the braided by the elastic connecting layers 37a and 37b. Both the inside and outside of the line 36 are covered. Therefore, the fine metal wire 36a is not exposed to the outside.
[0021]
The shield shell 40 is a single part formed by deep drawing a metal plate material. The shield part 40 has a cylindrical part 41 that forms a substantially oblong shape (substantially oval) as a whole, and a front end edge of the cylindrical part 41. It has a plate-like flange portion 42 that projects outward over the entire circumference, and a pair of attachment portions 43 that extend obliquely upward and outward from the left and right ends of the flange portion 42. The front surfaces of the flange portion 42 and the attachment portion 43 are in contact with the outer wall surface of the shield case 11 so as to contact each other. The attachment portion 43 has bolts corresponding to female screw holes (not shown) of the shield case 11. A hole 44 is formed.
[0022]
The shield shell 40 is connected to the front end portion of the shield member 35. That is, the front end portion of the shield member 35 is covered from behind to the cylindrical portion 41 of the shield shell 40, and a substantially oval caulking ring 45 slightly larger than the cylindrical portion 41 is fitted to the outer peripheral side thereof, and the caulking ring 45 is caulked. . By this caulking, the front end portion of the shield member 35 is fixed in a state of being sandwiched between the cylindrical portion 41 and the caulking ring 45. Thereby, the braided wire 36 of the shield member 35 and the shield shell 40 are connected to each other through the elastic connection layer 37a on the inner peripheral side of the elastic connection material 37 having conductivity. In addition, the terminal portions of the three electric wire side terminals 25 and the three electric wires 20 are led out from the shield shell 40 to the front.
[0023]
The conductive path A is connected to the device 10. At the time of connection, each electric wire side terminal 25 is individually inserted into each mounting hole 15 of the shield case 11. The device connection portion 26 of the inserted electric wire side terminal 25 is placed on the upper surface of the device side terminal 13 waiting in the shield case 11, and both the bolt holes 14 and 27 correspond to each other. Then, when a nut (not shown) is screwed and tightened to a bolt (not shown) penetrating both the bolt holes 14 and 27, both terminals 13 and 25 are fixed in the swing restricted state and can be conducted. Connected. Further, in the mounting hole 15, a space between the inner periphery and the outer periphery of the exterior body 30 is prevented by the seal ring 32.
[0024]
After the terminals 13 and 25 are connected to each other, the shield shell 40 is attached to the shield case 11. At the time of attachment, the bolt hole 44 of the shield shell 40 is made to correspond to the female screw hole of the shield case 11, and a bolt (not shown) inserted into the bolt hole 44 is screwed into the female screw hole and tightened. The shield shell 40 is fixed to the shield case 11 and connected to be conductive. As described above, the shield member 35 is connected to the shield case 11 via the shield shell 40, and the attachment of the conductive path A to the device 10 is completed.
[0025]
As described above, in the present embodiment, the shield member 35 is provided with the elastic connecting member 37 made of a material having elasticity and integrated with the braided wire 36 so that the metal thin wires 36a are connected to each other. As a result, even if an external force is applied to the braided wire 36 due to the insertion work of the electric wire 20 or foreign matter interference, and the gap 36b between the fine metal wires 36a temporarily expands, the elastic connection is established when the external force is removed. Since the gap 36b of the fine metal wire 36a is returned to the narrowed state by the elastic restoring force of the material 37, the gap 36b of the fine metal wire 36a is prevented from remaining enlarged.
[0026]
In addition, the elastic connecting member 37 has conductivity, and the elastic connecting member 37 is impregnated in the braided wire 36 so as to fill the gap 36b of the fine metal wire 36a. Therefore, the density of the fine metal wire 36a is reduced. Even if it is lowered, the shielding function is exhibited. Therefore, it is possible to reduce the cost and weight by the amount that the amount of use decreases with the decrease in the density of the fine metal wires 36a.
[ Reference Example 2]
Next, Reference Example 2 will be described with reference to FIG.
[0027]
In the second reference example , the shield member 50 is configured differently from the first embodiment. Since other configurations are the same as those of the first embodiment, the same configurations are denoted by the same reference numerals, and descriptions of structures, operations, and effects are omitted.
Elastic connection member 51 in the shield member 50 of the present embodiment 2 is not conductive. Therefore, in order to ensure conduction between the braided wire 36 and the shield shell 40, an elastic connection layer 51 b that does not include the thin metal wire 36 a is formed only on the outer peripheral side of the braided wire 36 and contacts the shield shell 40 of the braided wire 36. On the inner peripheral surface, the fine metal wires 36a are exposed over the entire region. In manufacturing the shield member 50, when the silicone rubber in the liquid state is injected into the gap between the two pipes 38a and 38b, the braided wire 36 is closely attached to the outer periphery of the pipe 38a. Leave it in the state you let it.
[0028]
[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
[0031]
( 1 ) In the first embodiment, the shield member is connected in a state of covering the outer periphery of the shield shell. However, according to the present invention, the shield member is connected in the state of being along the inner periphery of the shield shell. Also good.
[0032]
( 2 ) In the first embodiment , silicone rubber is used as the elastic connecting material. However, according to the present invention, an elastic material such as acrylic rubber, elastomer, NBR, or fluororubber may be used.
( 3 ) In the first embodiment , the elastic connecting material is made liquid and soaked into the gaps between the fine metal wires, and the elastic connecting material is cured by subsequent curing. The cured elastic connecting material thus formed may be fixed to the peripheral surface of the shield member ( both the inner peripheral surface and the outer peripheral surface ) with an adhesive.
In other words, the form in which the elastic connecting material closes the gap between the fine metal wires is not limited to the form in which the elastic connecting means is inserted into the gap between the fine metal wires and impregnated into the braided wire, but the braided wire is not impregnated into the braided wire. It can be set as the form closely_contact | adhered in layers along the surface of a line | wire.
[0033]
( 4 ) In the first embodiment, carbon fiber is mixed as a means for providing conductivity to the elastic connecting material. However, according to the present invention, not only carbon fiber but also metal fiber, metal powder, metal In addition, other conductive fibers other than carbon and metal, powder, particles and the like may be mixed.
(5) Although the above embodiments each wire terminals in 1 described the case of attaching to the individual devices, the present invention is to collectively holding a plurality of wire-side terminals in a single housing, a plurality of the wire-side terminals It can also be applied to a case where it is attached to a device with one action.
[0034]
( 6 ) In Embodiment 1 described above , a shield member may be covered with a corrugated tube to protect foreign matter from interference.
[Brief description of the drawings]
FIG. 1 is a perspective view of a terminal shield member and a wire side terminal in Embodiment 1. FIG. 2 is a plan view showing a state where a conductive path is attached to a device. FIG. 3 is a partially enlarged view showing a configuration of a braided wire. 4] Partial enlarged cross-sectional view of shield member [FIG. 5] Perspective view of braided wire, receiving pipe and exterior pipe [FIG. 6] Partial enlarged cross-sectional view of shield member of Reference Example 2 A ... Conductive path 20 ... Electric wire 35 ... Shield member 36 ... Braided wire 36a ... Metal fine wire 36b ... Gap 37 ... Elastic connecting material (elastic connecting means)

Claims (2)

Multiple wires,
A shield member having a tubular braided wire in which a plurality of fine metal wires are knitted into a mesh shape;
The plurality of electric wires are inserted through the shield member and collectively surrounded by the shield member,
The shield member is made of a material having elasticity, and is provided with an elastic connecting means integrated in a form for connecting the metal thin wires to the braided wire,
The elastic connecting means is made of a conductive material and is provided so as to impregnate or cover the gap between the fine metal wires, and the gap is formed by weaving the fine metal wires into a mesh shape. A braided wire stitch,
A conductive path having a shielding function, wherein both inner and outer surfaces of the braided wire are covered with an elastic connection layer comprising the elastic connection means. A shield member having a cylindrical braided wire knitted into a mesh of a plurality of fine metal wires, and enclosing the wires collectively by inserting a plurality of wires ,
It is made of a material having elasticity, and comprises elastic connecting means integrated in a form for connecting the fine metal wires to the braided wire,
The elastic connecting means is made of a conductive material and is provided so as to impregnate or cover the gap between the fine metal wires, and the gap is formed by weaving the fine metal wires into a mesh shape. A braided wire stitch,
The shield member characterized in that both inner and outer surfaces of the braided wire are covered with an elastic connection layer comprising the elastic connection means.

Images