JP2018006447A - Electromagnetic shield component and wire with electromagnetic shield component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of suppressing degradation of shielding properties, even if thermal change occurs, in an electromagnetic shield component.SOLUTION: An electromagnetic shield component 20 includes a cylindrical braid 50, a cylindrical member 60 to which the cylindrical braid 50 is applied, and a coupling member 70. The coupling member 70 is composed of a shape memory material having a transformation temperature lower than the highest temperature of a vehicle under use environment, formed annularly, pinches and holds a part of the cylindrical braid 50 overlapping the cylindrical member 60 therebetween, and presses the cylindrical braid 50 toward the cylindrical member 60, when the temperature goes above the transformation temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic shield component including a hard shield member and a flexible shield member, and an electric wire with an electromagnetic shield component including the same.

  In a wire harness mounted on a vehicle such as an automobile, an electromagnetic shield component surrounding the wire may be employed. For example, the electromagnetic shield component includes a hard shield member such as a metal pipe and a flexible shield member such as a cylindrical braided wire connected thereto.

  In the electromagnetic shielding component, the metal pipe performs an electromagnetic shielding function, physically protects the electric wire, and further maintains the electric wire in a shape along a predetermined wiring path.

  On the other hand, since the braided wire is a member formed in a cylindrical shape by knitting a copper wire, it has flexibility. The braided wire having flexibility fulfills an electromagnetic shielding function and enables bending deformation of a portion near the end of the electric wire.

  As shown in Patent Document 1, usually, a metal pipe and a braided wire are connected by a connecting member such as caulking. In this case, in the caulking, the metal pipe is fastened from the outer peripheral surface side, and a part of the braided wire covering the outer peripheral surface near the end of the metal pipe is sandwiched between the metal pipe. Thereby, the part near the end of the braided wire stays on the outer peripheral surface side of the part near the end of the metal pipe.

  On the other hand, in the shield conductive path shown in Patent Document 2, the braided wire is sandwiched between the outer peripheral surface of the support member inserted into the metal pipe and the inner peripheral surface of the crimped portion (compressed portion) of the metal pipe. Thereby, the part near the end of the braided wire stays on the inner peripheral surface side of the part near the end of the metal pipe.

JP 2007-280814 A JP 2006-310127 A

  By the way, in the conventional general electromagnetic shielding components, the metal pipe and the caulking ring may be formed of different metals. In this case, when repeated thermal changes occur, the contact resistance of the connection portion between the braided wire and the metal pipe increases due to the difference in the linear expansion coefficient between different metals, which may deteriorate the shielding performance. For example, it is conceivable that the state in which the metal pipe and the caulking ring are loosely tightened and the tightened state are repeated due to repeated thermal changes. In this case, the braided wire is repeated in a low compression state and a high compression state. Thereby, for example, it is conceivable that the contact resistance increases because the surface of at least one member of the braided wire and the metal pipe is peeled off or an oxide film is formed on the surface.

  Then, an object of this invention is to provide the technique which can suppress that a shielding property deteriorates even if a heat change arises in electromagnetic shielding components.

  In order to solve the above-described problem, the electromagnetic shielding component according to the first aspect includes a hard shield member formed in a hard cylindrical shape using a conductive material, and a softer material than the hard shield member using a conductive material. A flexible shield member that is formed in a cylindrical shape, has a portion near one end overlapped with an end portion of the hard shield member, and forms a series of hollow portions together with the hard shield member; It is made of a shape memory material having a transformation point lower than the highest temperature among the temperatures in use environment, is formed in an annular shape, and sandwiches and holds the overlapping portion of the flexible shield member between the hard shield member, A connecting member that presses the flexible shield member toward the hard shield member at a temperature equal to or higher than the transformation point.

  The electromagnetic shield component according to the second aspect is the electromagnetic shield component according to the first aspect, wherein the flexible shield member and the hard shield member are located on the outside in the overlapping portion. And the shape of the connecting member is stored in a state where the inner diameter is smaller than the outer diameter of the hard shield member.

  The electromagnetic shield component according to the third aspect is the electromagnetic shield component according to the first aspect, wherein the flexible shield member and the hard shield member in the overlapping portion are positioned so that the flexible shield member is located inside. And the shape of the connecting member is stored in a state where the outer diameter is larger than the inner diameter of the hard shield member.

  The electromagnetic shielding component according to a fourth aspect is the electromagnetic shielding component according to any one of the first to third aspects, and the connecting member is formed using a shape memory alloy as a material.

  The electromagnetic shielding component according to a fifth aspect is the electromagnetic shielding component according to the fourth aspect, wherein an insulating layer is provided between the coupling member and the flexible shielding member, and a circuit for passing an electric current through the coupling member Is provided.

  The electromagnetic shield component according to a sixth aspect is the electromagnetic shield component according to any one of the first to fifth aspects, wherein the connecting member forms an annular portion and the flexible shield member abuts on the electromagnetic shield component. A sandwiching portion that is formed in a shape corresponding to the peripheral surface of the hard shield member and sandwiches the flexible shield member with the hard shield member, and constitutes another annular portion so as to be separated from the peripheral surface of the hard shield member And a protruding portion formed in a protruding shape.

  The electric wire with an electromagnetic shielding component according to a seventh aspect includes the electromagnetic shielding component according to any one of the first to sixth aspects and an electric wire covered with the electromagnetic shielding component.

  According to the first to sixth aspects, the connecting member is made of a shape memory material having a transformation point lower than the highest temperature among the temperatures in the use environment of the vehicle, and the flexible shield member is at a temperature equal to or higher than the transformation point. Is pressed toward the hard shield member, so that even when the linear expansion coefficients of the connecting member and the hard shield member are different from each other, the tightening condition between the hard shield member and the connecting member is less likely to loosen even if a thermal change occurs. Thereby, it can suppress that shield property deteriorates.

  In particular, according to the second aspect, even in the case of so-called outer surface connection, in which the flexible shield member is connected to the outside of the hard shield member, it is possible to suppress the deterioration of the shielding property related to the heat change.

  In particular, according to the third aspect, even in the case of so-called inner surface connection, in which the flexible shield member is connected to the inner side of the hard shield member, it is possible to suppress the deterioration of the shielding property related to the heat change.

  In particular, according to the fourth aspect, since the connecting member is formed of a shape memory alloy, it is difficult to wear even when the flexible shield member is sandwiched.

  In particular, according to the fifth aspect, when the current flows through the connecting member, the connecting member is warmed, and the temperature of the connecting member can be maintained at the transformation point or higher when the temperature of the outside air is low.

  In particular, according to the sixth aspect, by providing the protruding portion on the connecting member, it is possible to easily realize a configuration for tightening the flexible shield member more firmly while maintaining the deformation amount that maintains the shape memory characteristics.

  According to the seventh aspect, the connecting member is made of a shape memory material having a transformation point lower than the highest temperature among the temperatures in the use environment of the vehicle, and the flexible shield member is hard shielded at a temperature equal to or higher than the transformation point. Since it presses toward a member, even if a thermal change arises when the linear expansion coefficients of a connection member and a hard shield member differ, the tightening condition of a hard shield member and a connection member becomes difficult to loosen. Thereby, it can suppress that shield property deteriorates.

It is a top view which shows the electric wire with electromagnetic shielding components which concerns on 1st Embodiment. It is a perspective view which shows the electric wire with electromagnetic shielding components which concerns on 1st Embodiment. It is a fragmentary sectional view which shows the electromagnetic shielding component which concerns on 1st Embodiment. It is a perspective view which shows the electric wire with electromagnetic shielding components which concerns on 2nd Embodiment. It is a fragmentary sectional view which shows the electromagnetic shielding component which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the modification of a connection member. It is a schematic sectional drawing which shows the modification of a connection member. It is a schematic sectional drawing which shows the modification of electromagnetic shielding components.

{First embodiment}
Hereinafter, the electromagnetic shielding component according to the first embodiment and the electric wire with the electromagnetic shielding component including the electromagnetic shielding component will be described. FIG. 1 is a plan view showing an electromagnetic shield component-attached electric wire 10 according to the first embodiment. FIG. 2 is a perspective view showing the electric wire 10 with electromagnetic shielding component according to the first embodiment. FIG. 3 is a partial cross-sectional view showing the electromagnetic shielding component 20 according to the first embodiment.

  The electromagnetic shield component-equipped electric wire 10 includes a connector 30, an electric wire 40, a tubular braid 50, a tubular member 60, and a connecting member 70. A conductive layer 34 is formed on the outer peripheral surface of the connector 30. The conductive layer 34 covers the terminal in the connector 30 and the connection portion between the terminal and the electric wire 40, the cylindrical braid 50 covers the portion of the electric wire 40 that is close to the connector 30, and the cylindrical member 60 covers the electric wire 40. The part away from the connector 30 is covered. Further, the connector 30 is electrically connected to the metal casing of the device in a state where the connector 30 is connected to the device to be connected. Thereby, the wiring path including the terminal and the electric wire 40 is covered with the conductive layer 34, the tubular braid 50 and the tubular member 60, and the conductive layer 34, the tubular braid 50 and the tubular member 60 are grounded to a metal housing or the like. The wiring path is electromagnetically shielded. In the present embodiment, the electromagnetic shielding component 20 includes a connector housing 32 of the connector 30, a conductive layer 34 formed on the outer surface, a tubular braid 50, a tubular member 60, and a connecting member 70. It is not essential to include both the connector housing 32 and the conductive layer 34 and the cylindrical member 60.

  The electric wire with electromagnetic shielding component 10 is used as a wiring for electrically connecting various electric devices mounted on a vehicle, and in particular, used as a wiring for connecting an electric device such as a battery, an inverter, a motor, etc. and through which a high voltage current flows. Suitable to be done.

  The connector 30 includes a connector housing 32 and terminals.

  The connector housing 32 is an example of a resin component formed of an insulating resin or the like. Here, the connector housing 32 is formed in a rectangular parallelepiped shape, and includes a housing main body portion 32a and a braid mounting portion 32b extending rearward of the housing main body portion 32a.

  The terminal is formed by pressing a plate material such as copper, copper alloy, aluminum, or aluminum alloy. A wire connection part is formed at one end of the terminal, and a mating connection part is formed at the other end of the terminal. An exposed core part at the end of the electric wire 40 is connected to the electric wire connecting part. The exposed core wire portion and the electric wire connecting portion may be connected by ultrasonic welding, resistance welding, soldering, or the like, or the electric wire connecting portion may be caulked and connected to the exposed core wire portion. The counterpart connection portion is a portion to which a counterpart terminal on the device side to which the electric wire 10 with electromagnetic shield component is connected is connected. The mating side connection portion may be formed in a plate shape with a screw hole and connected to the mating terminal by screwing, or a male terminal shape such as a pin shape or a tab shape, or Further, it may be formed in a cylindrical female terminal shape and fitted and connected to the mating terminal.

  The terminal is held by the connector housing 32 in a state where at least the electric wire connection portion is accommodated in the connector housing 32. Depending on the number of wires required, one or more terminals are held in the connector housing 32. The terminal may be configured to be inserted into a cavity formed in the connector housing 32 and held by the connector housing 32, or may be insert-molded so that a part of the terminal is embedded in the connector housing 32. It may be a configuration.

  The electric wire 40 is an example of a wiring member, and here, an insulating coating is formed around the core wire. The core wire may be a linear conductive member, and may be a single core wire, a twisted wire, a tubular braid, or the like. The insulation coating is not limited as long as the core wire can be insulated from the surroundings, and may be an extrusion-coated core wire, a heat shrinkable tube covering the core wire, a laminate film, or the like.

  The exposed core portion at the end of the electric wire 40 is connected to the electric wire connecting portion of the terminal in the connector housing 32. The electric wire 40 extends from the braid mounting portion 32 b at the rear of the connector housing 32. Usually, the electric wires 40 extend from the connector housing 32 by the number corresponding to the number of terminals held by the connector housing 32.

  The tubular braid 50 is an example of a flexible shield member. The tubular braid 50 has a structure in which metal wires are knitted, for example, a structure in which metal wires are knitted so as to form a cylindrical shape, or a mesh structure in which metal wires are woven so as to intersect vertically and horizontally. The thing of the structure rounded so that a metal cloth or a metal net | network may make a cylinder shape etc. are used. As the metal wire, various metal wires such as copper, copper alloy, aluminum, and aluminum alloy can be used. Nickel plating, tin plating, or the like may be formed on the surface of the metal wire. The tubular braid 50 is disposed between the connector 30 and the tubular member 60 so as to cover the entire periphery of the electric wire 40. The tubular braid 50 can be bent relatively easily and has a flexibility that can be disposed along the surface of the connector housing 32.

  One end portion of the tubular braid 50 is fixed to the tubular member 60, and the other end portion of the tubular braid 50 is electrically connected to the conductive layer 34 on the surface of the connector housing 32 in the connector housing 32. Fixed. These configurations will be described later.

  The outer periphery of the tubular braid 50 is covered with a corrugated tube 90. The corrugated tube 90 is a resin component formed such that a small-diameter annular portion and a large-diameter annular portion having an outer diameter larger than that of the small-diameter annular portion are alternately continued. The corrugated tube 90 has a property that it can be bent relatively easily in a state where the electric wire 40 and the tubular braid 50 are accommodated. For this reason, the part in which the cylindrical braid 50 and the corrugated tube 90 were provided among the electric wires 10 with electromagnetic shielding components can be bent relatively flexibly.

  Note that the flexible shield member need not be a metal wire braided. The flexible shield member may be a metal foil or the like.

  The corrugated tube 90 plays a role of covering and protecting the electric wire 40 and the tubular braid 50 between the connector 30 and the tubular member 60. For convenience of explanation, in FIG. 1, each end portion of the corrugated tube 90 is positioned in front of the connector 30 and in front of the cylindrical member 60, but each end portion of the corrugated tube 90 is the rear end of the connector 30. It is preferable to cover the end of the part or the cylindrical member 60.

  The cylindrical member 60 is a member formed in a cylindrical shape in which the electric wire 40 can be disposed. The cylindrical member 60 is a member formed in a hard cylindrical shape by a conductive material. In the present embodiment, the cylindrical member 60 is a metal pipe whose main component is a metal such as aluminum or stainless steel. However, the cylindrical member 60 may have a conductive layer formed on the peripheral surface of a resin component formed of an insulating resin. The cylindrical member 60 is an example of a hard shield member. One end of the tubular braid 50 is put on the end of the tubular member 60. Thereby, the cylindrical member 60 and the cylindrical braid 50 form a series of hollow portions. An electric wire 40 is disposed in the hollow portion.

  The cylindrical member 60 covers the electric wire 40 at a position spaced from the connector 30. The reason why the tubular member 60 is provided at a position spaced from the connector 30 is to allow the electric wire 40 to be bent between the tubular member 60 and the connector 30. That is, since the cylindrical member 60 is a relatively hard member, it also serves to maintain the electric wire 40 in a predetermined path shape. However, when the entire electric wire 40 is not bent, it is difficult to assemble the electric wire with electromagnetic shielding component 10 to the vehicle. Then, while fixing the cylinder member 60 to a vehicle and making the connector 30 easy to bend in a state where the connector 30 is connected to an electrical component of the vehicle, the assembling workability thereof can be improved. For this reason, the space | interval of the grade which makes it easy to bend the electric wire 40 between them between the cylinder member 60 and the connector 30 is provided. This interval is, for example, about 5 cm to 30 cm.

  The connecting member 70 is formed in an annular shape using a shape memory material. The connecting member 70 has a transformation point lower than the highest temperature in the vehicle usage environment. Here, the connecting member 70 </ b> A sandwiches one end of the tubular braid 50 between the tubular member 60 and fastens it. The connecting member 70A presses the tubular braid 50 toward the tubular member 60 when the temperature is equal to or higher than the transformation point. Further, the connecting member 70 </ b> B sandwiches the other end of the tubular braid 50 between the connector housing 32 and fastens it. The connecting member 70 </ b> B presses the tubular braid 50 toward the connector housing 32 when the temperature is equal to or higher than the transformation point.

  Here, the connecting member 70 is formed using a shape memory alloy. The shape memory alloy is not particularly limited as long as the transformation point is lower than the highest temperature in the environment of use of the vehicle. Nickel / titanium alloy, copper / aluminum / nickel alloy, copper / zinc An aluminum alloy or an alloy containing iron as a main component can be used. The shape memory alloy is preferably one that always exhibits superelasticity at room temperature, and more preferably one that always exhibits superelasticity under the environment of use of the vehicle (for example, minus 40 degrees Celsius to 120 degrees Celsius). That is, the shape memory alloy preferably has a transformation point of room temperature or lower, and more preferably has a temperature of minus 40 degrees Celsius or lower. However, the shape memory alloy may have a transformation point of 120 degrees Celsius or less even if it is greater than room temperature. In the shape memory alloy, the transformation temperature can be adjusted by adjusting the content ratio of each metal of the alloy component.

  Here, the connecting member 70 is formed in a cylindrical shape. For example, the connecting member 70 is covered with an overlapping portion of the tubular member 60 and the tubular braid 50 in a state where the inner diameter is larger than the outer diameter of the tubular member 60, and then the diameter of the connecting member 70 is reduced. And attached to the outside of the tubular braid 50. The connecting member 70 is reduced in diameter by caulking deformation, for example. Further, for example, the connecting member 70 is heated to be reduced in diameter using shape memory characteristics. In addition, when the connecting member 70 is reduced in diameter by caulking deformation, even when at least one of the tubular braid 50 and the tubular member 60 is formed of aluminum, the connecting member 70 is a member formed of aluminum. The oxide film on the surface can be destroyed more reliably.

  Note that, by the same configuration as described above, the other end of the tubular braid 50 is fixed to the braid mounting portion 32b of the connector housing 32 by the connecting member 70B, and the conductive layer 34 formed on the outer surface of the braid mounting portion 32b. And are electrically connected.

  The conductive layer 34 is a layer formed on the outer surface of the braid mounting portion 32b by a conductive member. The conductive layer 34 is formed by metal plating such as nickel, tin, or copper. However, the conductive layer 34 may be formed by mounting a metal part formed as a separate part from the connector housing 32 by molding or the like. The conductive layer 34 may be formed by vapor deposition, application of a conductive paint, or the like.

  The conductive layer 34 is formed not only on the outer surface of the braided mounting portion 32b of the connector housing 32, which is a resin component, but also on the outer surface of the housing main body portion 32a. For this reason, the connector housing 32 can be shielded electromagnetically.

<Transition of the connecting portion between the tubular braid 50 and the tubular member 60 and the like accompanying a temperature change>
As described above, one end portion of the tubular braid 50 is fixed to the outer peripheral surface by the connecting member 70 in a state of covering the outer peripheral surface in the four directions around the end portion of the cylindrical member 60. The connecting member 70 has a shape memorized in a state where the inner diameter is smaller than the outer diameter of the cylindrical member.

  In this case, the connecting member 70 fitted on the cylindrical member 60 tries to return to the memorized shape when the temperature is higher than the transformation point, and the inner peripheral surface tends to shrink radially inward from the outer peripheral surface of the cylindrical member 60. To do. For this reason, the cylindrical braid 50 sandwiched between the outer peripheral surface of the cylindrical member 60 and the inner peripheral surface of the connecting member 70 is surrounded by the inner peripheral surface of the connecting member 70 that is intended to shrink radially inward. Pressed against the surface.

  Below the transformation point, the connecting member 70 only contracts and expands according to the coefficient of linear expansion in accordance with the temperature change in the same manner as a normal member that is not formed of a shape memory material. For this reason, below the transformation point, the degree of tightening of the tubular braid 50 may be loose due to the difference in the linear expansion coefficient between the connecting member 70 and the tubular member 60. Even in this case, it is considered that the variation in dimensions between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 due to temperature change is smaller than when the connecting member 70 is not formed of a shape memory material. .

  More specifically, it is assumed here that the linear expansion coefficient of the cylindrical member 60 is larger than the linear expansion coefficient of the connecting member 70. In the following, the case where the temperature changes from the first temperature higher than the transformation point to the second temperature lower than the transformation point beyond the transformation point will be considered.

  When the temperature changes from the first temperature to the second temperature, the connecting member 70 and the cylindrical member 60 contract according to the linear expansion coefficient. At this time, since the linear expansion coefficient of the cylindrical member 60 is larger than the linear expansion coefficient of the connecting member 70, the contraction amount of the cylindrical member 60 is larger than the contraction amount of the connecting member 70. However, during the temperature change from the first temperature to the transformation point, since the connecting member 70 is formed of the shape memory material, the connecting member 70 is in a superelastic state and tries to return to the memorized shape. . That is, the inner diameter of the connecting member 70 always tends to be smaller than the outer diameter of the cylindrical member 60. For this reason, during the temperature change from the first temperature to the transformation point, the dimension between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 is kept small. On the other hand, when the temperature changes from the transformation point to the second temperature, since the connecting member 70 is not in a superelastic state, only contraction related to the linear expansion coefficient occurs. At this time, the dimension between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 increases with a difference in linear expansion coefficient between the cylindrical member 60 and the connecting member 70.

  Here, if the connecting member 70 is not formed of a shape memory material, the connecting member does not exhibit a superelastic state during the temperature change from the first temperature to the transformation point, and shrinkage related to the linear expansion coefficient. Only occurs. Thereby, when the temperature changes from the first temperature to the transformation point, the difference in the linear expansion coefficient between the cylindrical member 60 and the coupling member 70 is similar to that when the temperature changes from the transformation point to the second temperature. The dimension between an inner peripheral surface and the outer peripheral surface of the cylindrical member 60 becomes large. For this reason, when the temperature changes from the first temperature to the second temperature, the dimensional variation difference between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 is caused by the connecting member 70 being formed of a shape memory material. It is thought that it becomes larger than the case where it is.

  Therefore, when the connecting member 70 is formed of the shape memory material, the dimensional difference between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 is large when the temperature changes from the first temperature to the second temperature. It is suppressed. As a result, the displacement and loosening of the tubular braid 50 and the tubular member 60 are suppressed, so that it is difficult for the tubular braid 50 and the tubular member 60 to form an oxide film or peeling off the plating, and the contact resistance value is increased. Can be suppressed. Thereby, even if a heat change arises in the electromagnetic shielding component 20, it can suppress that the shielding performance of the electromagnetic shielding component 20 deteriorates.

  In the above case, when the temperature changes from the second temperature to the transformation point (temperature rise), the expansion amount of the tubular member 60 is greater than the coupling member due to the difference in the linear expansion coefficient between the tubular member 60 and the connecting member 70. It becomes larger than the expansion amount of 70, and the dimension between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 becomes smaller. When the transformation point is exceeded, the connecting member 70 tries to return to the memorized shape, so that the dimension between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 is kept small.

  Further, when the linear expansion coefficient of the connecting member 70 is smaller than the linear expansion coefficient of the cylindrical member 60, conversely to the above case, when the temperature changes from the second temperature to the transformation point, the connection is caused by the difference in the linear expansion coefficient. The dimension between the inner peripheral surface of the member 70 and the outer peripheral surface of the cylindrical member 60 is increased. However, when the temperature changes from the transformation point to the first temperature, the connecting member 70 becomes in a superelastic state, and the dimension between the inner peripheral surface of the connecting member 70 and the outer peripheral surface of the cylindrical member 60 is reduced.

<Manufacturing method>
A method for manufacturing the electromagnetic shielding component 20 including a method for connecting the one end of the tubular braid 50 to the tubular member 60 and the like will be described.

  First, the connecting member 70 is expanded and deformed so that the inner diameter of the connecting member 70 is larger than the outer diameter of the tubular member 60 (here, the outer diameter of the tubular braid 50 placed on the end of the tubular member 60). . Then, the end of the cylindrical member 60 is inserted through the connecting member 70 whose diameter has been deformed.

  Next, one end of the tubular braid 50 is placed around the end of the tubular member 60 to form an overlapping portion. Then, the connecting member 70 is put on the outer periphery of the overlapping portion.

  Subsequently, the connecting member 70 is deformed in a reduced diameter. For example, the connecting member 70 is pressed from the outside of the connecting member 70 toward the outer surface of the tubular member 60 by a heating and pressing member. As the heating and pressing member, a metal block incorporating a heater can be used. The heating and pressing member may have a concave portion corresponding to the outer surface of the connecting member 70, and may be configured to press the connecting member 70 all at once around the connecting member 70. When the connecting member 70 is deformed in a reduced diameter, the tubular braid 50 is pressed against the tubular member 60 by the connecting member 70. As a result, one end of the tubular braid 50 is fixed to the end of the tubular member 60.

  Similarly, the electromagnetic shield component 20 is manufactured by fixing the other end of the tubular braid 50 to the connector housing 32.

  In order to reduce the diameter of the connecting member 70, it is not essential to perform both the heating process and the pressurizing process, and only one of them may be used. Moreover, even when performing both a heating process and a pressurization process, it is not essential to perform both processes simultaneously, and you may perform both processes in order. In this case, either step may be performed first.

{Second Embodiment}
The electromagnetic shielding component according to the second embodiment and the electric wire with the electromagnetic shielding component including the electromagnetic shielding component will be described. FIG. 4 is a perspective view showing the electric wire 110 with electromagnetic shield component according to the second embodiment. FIG. 5 is a partial cross-sectional view showing the electromagnetic shielding component 120 according to the second embodiment. In the description of the present embodiment, the same components as those described above are denoted by the same reference numerals, and description thereof is omitted.

  The electromagnetic shielding component 120 according to the second embodiment is different from the electromagnetic shielding component 20 according to the first embodiment in the structure in which the tubular braid 150 is sandwiched between the tubular member 160 and the connecting member 170.

  Specifically, in the electromagnetic shielding component 120, the tubular braid 150 and the connecting member 170 are located on the inner peripheral side of the tubular member 160. A tubular braid 150 is sandwiched between the inner peripheral surface of the cylindrical member 160 and the outer peripheral surface of the connecting member 170.

  In this case, the shape of the connecting member 170 is stored in a state where the outer diameter is larger than the inner diameter of the cylindrical member 160. As a result, the connecting member 170 fitted in the cylindrical member 160 tends to return to the memorized shape when the temperature is higher than the transformation point, so that the outer peripheral surface is wider radially outward than the inner peripheral surface of the cylindrical member 160. I will try. For this reason, the tubular braid 150 sandwiched between the inner peripheral surface of the cylindrical member 160 and the outer peripheral surface of the connecting member 170 is formed inside the cylindrical member 160 by the outer peripheral surface of the connecting member 170 that attempts to spread radially outward. Pressed against the circumference.

  According to the electromagnetic shielding parts 20 and 120 and the electric wires with electromagnetic shielding parts 10 and 110 configured as described above, the connecting members 70 and 170 have a transformation point lower than the highest temperature among the temperatures in the use environment of the vehicle. When the tubular braids 50 and 150 are pressed against the tubular members 60 and 160 when the temperature is equal to or higher than the transformation point, the connecting member 70 and the tubular members 60 and 160 have different linear expansion coefficients. Even if a heat change occurs, the tightening degree between the cylindrical members 60 and 160 and the connecting member 70 becomes difficult to loosen. Thereby, it can suppress that the shielding performance deteriorates in the electromagnetic shielding component 20.

  Further, since the connecting member 70 is formed of a shape memory alloy, it is difficult to wear even when the tubular braids 50 and 150 are sandwiched.

  Further, according to the electromagnetic shielding component 20 and the electric wire with electromagnetic shielding component 10, even when the tubular braid 50 is connected to the outside of the tubular member 60, so-called outer surface connection, it is possible to suppress the deterioration of the shielding property related to the heat change. Can do.

  In addition, according to the electromagnetic shield component 120 and the electromagnetic shield component-equipped electric wire 110, even in the case of so-called inner surface connection in which the tubular braid 150 is connected to the inner side of the tubular member 160, it is possible to suppress the deterioration of the shielding property related to thermal changes. Can do.

{Modifications}
Next, a modified example of the electromagnetic shielding component-attached electric wire 10 will be described.

  First, a modified example of the connecting member 70 will be described with reference to FIGS. 6 and 7. 6 and 7 are schematic cross-sectional views showing modifications of the connecting member 70. FIG. FIG. 6 shows a state in which the diameter of the connecting member 270 is increased and deformed so that the tubular member 60 and the tubular braid 50 are passed through the connecting member 270 according to the modification. FIG. 7 shows a state in which the tubular braid 50 is fastened by the connecting member 270 and the tubular member 60.

  The connecting member 270 is different from the connecting member 70 according to the first embodiment in that the connecting member 270 includes a protruding portion 274. Specifically, the connecting member 70 is formed in an annular shape and includes a sandwiching portion 272 and a protruding portion 274.

  The clamping part 272 constitutes an annular part. The sandwiching portion 272 is a portion that sandwiches the tubular braid 50 with the tubular member 60. The sandwiching portion 272 is formed in a shape corresponding to the circumferential surface of the tubular member 60 with which the tubular braid 50 abuts. Here, since the outer peripheral surface of the cylindrical member 60 is formed in a circular cross section, the inner peripheral surface of the clamping portion 272 is formed in a circular arc shape (here, a C shape).

  The protrusion 274 constitutes another part of the ring. The protruding portion 274 is formed in a shape that protrudes away from the peripheral surface of the cylindrical member 60. Here, since the connecting member 70 is externally fitted to the cylindrical member 60, the protruding portion 274 protrudes radially outward with respect to the cylindrical member 60. The protruding portion 274 connects one end and the other end of the sandwiching portion 272 along the circumferential direction while exhibiting a bellows shape. In other words, the protruding portion 274 is formed in a shape in which convex portions 275 that protrude radially outward and concave portions 276 that are recessed radially inward are alternately connected in the circumferential direction. The inner peripheral surface of the convex portion 275 is open radially inward. The connecting member 270 is shape-memorized so that the inner diameter of the clamping part 272 is smaller than the outer diameter of the cylindrical member 60 in a state where the opening on the inner peripheral surface of the convex part 275 is narrow.

  In order to make the inner diameter of the clamping part 272 larger than the outer diameter of the cylindrical member 60 when the coupling member 270 is externally fitted to the cylindrical member 60, the opening on the inner peripheral surface of the convex part 275 is widened as shown in FIG. Thus, the connecting member 270 is deformed. When the tubular member 60 and the tubular braid 50 are passed through the connecting member 270, the connecting member 270 is deformed so as to narrow the opening on the inner peripheral surface of the convex portion 275 of the connecting member 270. As a result, the connecting member 270 is externally fitted to the tubular member 60 with the tubular braid 50 sandwiched between the connecting member 270 and the tubular member 60.

  According to such a connecting member 270, the protrusion 274 is provided on the connecting member 270, thereby easily realizing a configuration for tightening the tubular braid 50 more firmly while maintaining the deformation amount that maintains the shape memory characteristics. it can. More specifically, the upper limit of the deformation amount (the deformation amount with respect to the shape memorized shape) in which the shape memory characteristic is maintained is, for example, about 10%. Even in this case, the amount of deformation of the sandwiching portion 272 sandwiching the cylindrical member 60 can be kept within 10% by mainly causing the protruding portion 274 to perform deformation when the connecting member 270 is externally fitted to the cylindrical member 60. .

  In addition, when the connection member 170 is fitted in the cylindrical member 160 like the electromagnetic shielding component 120 according to the second embodiment, it is conceivable that the protruding portion protrudes radially inward with respect to the sandwiching portion.

  Next, another modification of the electromagnetic shielding component 20 will be described with reference to FIG. FIG. 8 is a schematic cross-sectional view showing another modification of the electromagnetic shielding component 20.

  The electromagnetic shield component 320 according to the modified example is different from the electromagnetic shield component 20 according to the first embodiment in that a circuit 80 is provided.

  The circuit 80 is provided so that a current can flow through the connecting member 70. An insulating layer 100 is provided between the connecting member 70 and the tubular braid 50. As a result, even if a current flows through the connecting member 70 through the circuit 80, the current does not flow through the tubular braid 50 and the tubular member 60.

  According to such an electromagnetic shielding component 320, the connection member 70 is warmed by passing a current through the connection member 70 through the circuit 80. Thereby, even when the temperature of outside air is low, the temperature of the connection member 70 can be kept at the transformation point or higher.

  As another modification, for example, in the embodiment, the connecting member 70 has been described as being formed of a shape memory alloy, but this is not essential. The connecting member 70 may be formed using a shape memory polymer as a material.

  In addition, each structure demonstrated by said each embodiment and each modification can be suitably combined unless it mutually contradicts.

  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.

10, 110 Electric shield with electromagnetic shield part 20, 120, 320 Electromagnetic shield part 30 Connector 32 Connector housing 34 Conductive layer 40 Electric wire 50, 150 Tubular braid 60, 160 Cylindrical member 70, 170, 270 Connecting member 272 Holding part 274 Protruding part 100 Insulating layer

Claims (7)

A hard shield member formed into a hard cylindrical shape using a conductive material;
It is formed in a cylindrical shape that is more flexible than the hard shield member using a conductive material, and a portion near one end forms an overlapping portion that overlaps an end portion of the hard shield member, and a series of hollows together with the hard shield member A flexible shield member forming a portion;
It is made of a shape memory material having a transformation point lower than the highest temperature in the environment of use of the vehicle, is formed in an annular shape, and the overlapping portion of the flexible shield member is sandwiched between the hard shield member and fastened A connecting member that presses the flexible shield member toward the hard shield member at a temperature equal to or higher than the transformation point;
An electromagnetic shielding component comprising The electromagnetic shielding component according to claim 1,
In the overlapping portion, the flexible shield member and the hard shield member are overlapped so that the flexible shield member is located outside,
The connecting member is an electromagnetic shielding component whose shape is memorized in a state in which an inner diameter is smaller than an outer diameter of the hard shield member. The electromagnetic shielding component according to claim 1,
In the overlapping portion, the flexible shield member and the hard shield member overlap so that the flexible shield member is located inside,
The connecting member is an electromagnetic shielding component whose shape is stored in a state where an outer diameter is larger than an inner diameter of the hard shield member. The electromagnetic shielding component according to any one of claims 1 to 3,
The connecting member is an electromagnetic shielding part formed of a shape memory alloy. The electromagnetic shielding component according to claim 4,
An insulating layer is provided between the connecting member and the flexible shield member;
An electromagnetic shielding component, wherein a circuit for passing an electric current is provided in the connecting member. The electromagnetic shielding component according to any one of claims 1 to 5,
The connecting member is formed in a shape corresponding to a peripheral surface of the hard shield member that constitutes a part of an annular shape and contacts the flexible shield member, and sandwiches the flexible shield member with the hard shield member; And a projecting portion formed in a shape projecting away from the peripheral surface of the hard shield member. The electromagnetic shielding component according to any one of claims 1 to 6,
An electric wire covered with the electromagnetic shielding component;
An electric wire with electromagnetic shielding parts.

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