JP2008181801A - Shielding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shielding member wherein strands cannot be disconnected easily compared with conventional ones. <P>SOLUTION: A shielding member 10 is formed by braiding strand bundles 12 which bundle many strands. In at least one part of the strand bundles 12, a soft strand 14 and a hard strand 16 with higher rigidity are mixed. When a connection terminal 18 is crimped to the shielding member 10, the hard strand 16 which cannot be crushed easily prevents an overload from being applied to the soft strand 14, thereby suppressing the disconnection of the strands. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shield member, and more particularly to a shield member suitable for use in a wire harness attached to a vehicle such as an automobile.

  Conventionally, wire harnesses in which electric wires are bundled are used for wiring of vehicles such as automobiles and electronic devices. A shield member may be provided on the outer periphery of the wire harness in order to cut intrusion of noise from the outside to the wire harness and noise radiated to the outside. As this shield member, a shield member formed by knitting a large number of strands such as an annealed copper wire is often used.

  Usually, the connection terminal for attaching to a connection other member is crimped | bonded to the edge part of the wire harness with which this shield member was coat | covered. For example, Patent Document 1 discloses that an inner shell is provided inside a shield member, an outer shell is extrapolated on the outer periphery of the shield member, the shield member is sandwiched between both shells, and then crimped.

  Further, in some cases, a method of forming a protrusion on the inner side of the outer shell to prevent the shield member from falling off and crimping may be used.

Japanese Patent Laid-Open No. 2003-197037

  However, when the above-described pressure bonding is performed using a conventional shield member, there are the following problems. In other words, overload is likely to be applied to the strands of the shield member during crimping. Therefore, there has been a problem that the strands are crushed and the strands are easily broken at the crimping portion. In particular, when the protrusions are formed, the disconnection of the strands is remarkable.

  Therefore, the problem to be solved by the present invention is to provide a shield member in which the strands are harder to break than in the prior art.

  In order to solve the above-described problem, the shield member according to the present invention is formed by weaving a bundle of strands in which a plurality of strands are bundled, and at least a part of the bundle of strands includes a soft strand, The gist is that a hard hard wire is mixed.

  Here, the shield member according to the present invention preferably has at least one or more of the hard strands in the strand bundle.

  Moreover, it is preferable that the said hard strand hold | maintains the strand diameter of the said soft strand to 0.5-1 times or less before crimping at the time of crimping | compression-bonding.

 And it is preferable that the strand diameter of the said hard strand exists in the range of 1 to 1.5 times of the said soft strand.

  According to the shield member of the present invention, a soft strand and a hard strand harder than this are mixed in at least a part of the strand bundle of the shield member. Therefore, when crimping the shield member to the connection terminal, the hard strand that is not easily crushed can prevent the soft strand from being overloaded, and the disconnection of the strand can be suppressed.

  Further, if the shield member is configured to have at least one hard strand in the strand bundle, the hard strand can be evenly dispersed in the shield member. Therefore, it is possible to efficiently prevent an overload applied to the soft strand.

  And according to previous studies by the present inventor, it has been found that when the strand diameter after crimping is less than 0.5 times the strand diameter before crimping, the strand is likely to break. Therefore, when a hard strand keeps the strand diameter of a soft strand at 0.5-1 times before crimping at the time of crimping, disconnection of the strand can be further suppressed and reliability is improved. Easy to improve.

  Furthermore, when the strand diameter of the hard strand is within the range of 1 to 1.5 times that of the soft strand, the soft strand is hard to be crushed and surely suppresses overload on the soft strand. it can.

  Hereinafter, an embodiment of the present invention will be described in detail.

  The shield member according to the present invention is formed by weaving a plurality of strands in which a plurality of strands are bundled. The shield member is formed by mixing a soft strand and a hard strand harder than at least a part of a bundle of strands. Here, the hard wire is made of a material harder than the soft wire.

  Examples of the material of the soft strand include soft copper, plated soft copper, and aluminum alloy, but are not particularly limited thereto.

  Moreover, as a material of a hard strand, although iron, stainless steel, hard copper, a copper alloy, a hard aluminum alloy etc. can be illustrated, it is not specifically limited to this.

  The hard wire may be mixed in all the wire bundles, or may be mixed in a part of the wire bundles. The former is preferable. This is because if the hard wires are mixed in all the strands, the hard wires can be evenly dispersed in the shield member. It is preferable that at least one hard strand is included in the strand bundle. Moreover, only 1 type may be mixed and 2 or more types of hard strands may be mixed in the strand bundle. Furthermore, a shield member can also be formed by combining several strand bundles composed of only one or two or more types of hard strands and strand bundles composed only of soft strands.

  And the ratio of the hard strand in a strand is preferably 5 to 50%, more preferably 10 to 30%. The reason why the ratio of the hard wire is preferably 10 to 30% is to surely suppress the overload applied to the soft wire and not to affect the shield characteristics.

  Furthermore, the ratio of the hard strands in each strand bundle may be the same for each strand bundle, or may be changed for each strand bundle. Moreover, the said hard strand can be used for the arbitrary locations in a strand bundle.

  1 and 2 are schematic views of a shield member according to an embodiment of the present invention. The shield member 10 is formed by weaving a strand 12 in which a plurality of strands are bundled. The strand 12 is composed of a soft strand 14 and a hard strand 16.

  FIG. 1 shows a case where the ratio of the hard wires 16 in the wire bundle is the same for each wire bundle 12 and one or more hard wires 16 are included in the wire bundle.

  Further, FIG. 2 uses a plurality of strands 12 in which the ratio of the hard strands 16 in the strands is changed, and further uses each hard strand 16 at an arbitrary location in each strand to shield the shield member 10. Is shown.

  FIG. 3 is a cross-sectional view when the above-described shield member 10 is crimped by the connection terminal (caulking member) 18.

  FIG. 3 shows a case where the hard wire 16 is mixed between the soft wires 14 in the shield member 10 of the present invention.

  As can be seen from FIG. 3, when the shield member 10 is crimped by the connection terminal 18, the hard strand 16 is mixed between the soft strands 14, so that the pressing force is dispersed at the portion of the hard strand 16. Moreover, it can suppress that an overload is applied to the soft strand 14.

  Here, when the connection terminal is crimped to the shield member, the hard strand preferably holds the strand diameter of the soft strand at 0.5 to 1 times or less before the crimping. In other words, it is preferable to hold the hard strand so that the strand diameter of the soft strand does not become less than one-half before the crimping. And more preferably, a hard strand is good to hold | maintain the strand diameter of a soft strand to 0.7-1 times or less before crimping. If the strand diameter after crimping is less than 0.5 times the strand diameter before crimping, the strand is likely to break. Therefore, by keeping the strand diameter after crimping at 0.5 times or more, This is because it is possible to further suppress the disconnection.

  Moreover, the strand diameter of a soft strand and a hard strand is not specifically limited, It can change as needed.

  Furthermore, the strand diameter of the hard strand is preferably 1 to 1.5 times, more preferably 1.1 to 1.3 times that of the soft strand. This is because, if the strand diameter of the hard strand is one or more times that of the soft strand, even if the hard strand is overloaded during crimping, the overload applied to the soft strand can be reliably suppressed. Moreover, if the strand diameter of a hard strand is 1.5 times or less of a soft strand, it can handle similarly to a soft strand, and a shield member can be produced with the conventional construction method.

  The method for producing a shield member according to the present invention preferably includes at least a step of weaving a strand of wire in which soft strands and hard strands are mixed.

  At this time, if bobbins having different ratios of hard strands in the strand bundle are used, shield members having different ratios of hard strands in each strand bundle can be produced as shown in FIG.

  The shield member of the present invention can be manufactured using a general braided knitting machine. The braided knitting machine includes a feeding mechanism for sending the strand bundle, a braiding mechanism for braiding the strand bundle, and a winding mechanism for winding the braided shield member. A predetermined number of bobbins each wound with a bundle of strands are prepared and set in a delivery mechanism. By rotating and moving each bobbin, the strands are knitted while feeding the strands to produce a shield member.

  Thus, the produced shield member can be provided in the outer periphery of the wire harness 22 comprised by bundling the electric wire 20, as shown, for example in FIG.

  A connection terminal to be attached to the connection partner member is crimped to the end portion of the shield member 10 provided with the wire harness 22 inside. For example, as the connection terminal, a cylindrical metal shell 24 can be used as shown in FIG.

  The metal shell 24 includes an inner shell 26 and an outer shell 28. An inner shell 26 is provided inside the shield member 10, an outer shell 28 is extrapolated on the outer periphery of the shield member 10, and the shield member 10 is sandwiched between the two shells and crimped.

  Here, the shape of the metal shell 24 may be a substantially rectangular tube shape, a cylindrical shape, or the like, but is not limited thereto, and can be appropriately changed depending on the shape of the connection partner member.

  Furthermore, the outer diameter of the metal shell can be appropriately changed depending on the shape of the wire harness provided inside the shield member. Moreover, since the shield member has elasticity, when the shield member is inserted into the metal shell, the opening of the shield member can be expanded or narrowed according to the outer diameter of the metal shell.

   FIG. 5 shows a longitudinal sectional view of FIG. As shown in FIG. 5, a protrusion 30 is formed on the inner side of the outer shell 28 along the inner periphery of the outer shell 28. The protrusion 30 is provided to prevent the shield member 10 from falling off.

   According to the present invention, by mixing hard wires with the shield member, the breakage of the wires can be suppressed even in such a protrusion.

  FIG. 4 illustrates a plurality of electric wires as an example of the wire harness. However, the wire harness is not limited to this, and a bundle of protection devices such as information circuits and fuses may be covered with a shield member. Good.

  Moreover, although the example which used the shield member of this invention for the wire harness was shown in the present Example, it is not limited to this, For example, you may use for a coaxial line, a twisted pair cable, etc.

  The shield member according to the present invention can be used for a wire harness attached to a vehicle such as an automobile.

It is the schematic of the shield member which concerns on one Embodiment of this invention. It is the schematic of the shield member which concerns on other embodiment of this invention. It is sectional drawing when the shield member which concerns on one Embodiment of this invention is crimped | bonded by the connection terminal. It is a side view when the shield member which concerns on one Embodiment of this invention is provided in the outer periphery of a wire harness, and crimped | bonded by the outer shell. It is sectional drawing of the longitudinal direction of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Shield member 12 ... Strand bundle 14 ... Soft strand 16 ... Hard strand 18 ... Connection terminal 20 ... Electric wire 22 ... Wire harness 24 ... Metal shell 26 ... Inner shell 28 ... Outer shell 30 ... Protrusions

Claims (4)

  A shield member formed by weaving a bundle of strands in which a plurality of strands are bundled, and a soft strand and a hard strand harder than this are mixed in at least a part of the strand bundle A shielding member characterized by that.   The shield member according to claim 1, wherein at least one of the hard wires is included in the wire bundle.   The shield member according to claim 1 or 2, wherein the hard strand keeps the strand diameter of the soft strand at 0.5 to 1 times or less of that before the crimping.   The shield member according to any one of claims 1 to 3, wherein a strand diameter of the hard strand is in a range of 1 to 1.5 times that of the soft strand.

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