Wire fixing structure

Abstract

To provide a wire fixing structure capable of stably protecting internal electric wires.SOLUTION: In a wire fixing structure 1 including an electric wire 3 having a sheath portion 9 covering the outer periphery of a plurality of internal electric wires 7, and a positioning member 23 arranged on the sheath portion 9 and the internal electric wires 7 exposed from the sheath portion 9 relative to the outer periphery of the electric wire 3, the positioning member 23 includes a sheath fixing portion 41 fixed to the sheath portion 9 and an internal fixing portion 43 fixed to the plurality of internal electric wires 7.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an electric wire fixing structure. [Background technology]

[0002] Conventionally, an electric wire fixing structure includes a twisted pair cable as an electric wire having a sheath portion covering the outer periphery of a plurality of communication wires as inner electric wires. Also known is a structure including a crimping member as a placement member that is placed around the outer periphery of the twisted pair cable, on the sheath portion and the communication wires exposed from the sheath portion (see Patent Document 1). In this electric wire fixing structure, the crimping member has a barrel portion that is crimped around the outer periphery of the sheath portion, and a non-crimping portion that is placed around the communication wires exposed from the sheath portion. The crimping member is fixed to the twisted pair cable by crimping the barrel portion around the outer periphery of the sheath portion. The non-crimping portion of the crimping member is placed around the communication wires, thereby keeping the impedance of the communication wires exposed from the sheath portion within a desired range. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-51846 Summary of the Invention [Problem to be solved by the invention]

[0004] However, electric wires having a sheath covering the outer periphery of multiple internal electric wires have weak adhesion between the multiple internal electric wires and the sheath. Therefore, when a tensile force is applied to the electric wire, the internal electric wires and the sheath are pulled so as to become independent of each other. In the electric wire fixing structure of Patent Document 1, the positioning member is fixed only to the sheath of the electric wire. Therefore, when a tensile force is applied to the electric wire, the positioning member moves along with the sheath, causing a change in the positioning member relative to the internal electric wires exposed from the sheath, which may result in the internal electric wires not being stably protected by the positioning member. In addition, when the positioning member is fixed, the sheath is likely to stretch and become thinner when a tensile force is applied, which may result in unstable protection of the internal electric wires.

[0005] The present invention has been made in view of the problems inherent in the prior art, and an object of the present invention is to provide a wire fixing structure that can stably protect internal wires. [Means for solving the problem]

[0006] The electric wire fixing structure according to this embodiment includes an electric wire having a sheath portion covering the outer periphery of a plurality of internal electric wires, and a positioning member that is placed on the sheath portion and the internal electric wires exposed from the sheath portion relative to the outer periphery of the electric wire, and the positioning member has a sheath fixing portion fixed to the sheath portion and an internal fixing portion fixed to the plurality of internal electric wires. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a wire fixing structure that can stably protect internal wires. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of an electric wire fixing structure according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the electric wire fixing structure according to the embodiment. [Figure 3]1 is a perspective view of the electric wire fixing structure according to the embodiment, in which an outer terminal is attached to an end portion of the electric wire. FIG. [Figure 4] FIG. 4 is a cross-sectional view of FIG. [Figure 5] FIG. 5 is an enlarged view of a main part of FIG. 4. [Figure 6] 1 is a perspective view of an electric wire fixing structure according to the present embodiment, in which an inner housing is attached to an end portion of the electric wire. FIG. [Figure 7] 1 is a perspective view of the electric wire fixing structure according to the embodiment, in which an inner terminal is attached to an end portion of the electric wire. FIG. [Figure 8] FIG. 2 is a side view of the electric wire in the electric wire fixing structure according to the embodiment. [Figure 9] FIG. 2 is a perspective view of a placement member of the electric wire fixing structure according to the embodiment. [Figure 10] FIG. 2 is a perspective view of the arrangement member of the electric wire fixing structure according to the present embodiment when unfolded. [Figure 11] 10 is a cross-sectional view of the electric wire fixing structure according to the embodiment when an internal fixing portion of the arrangement member is fixed to an internal electric wire. FIG. [Figure 12] 10 is a cross-sectional view of another example of the arrangement member of the electric wire fixing structure according to the present embodiment, when an inner fixing portion is fixed to an inner electric wire. FIG. [Figure 13] 10 is a cross-sectional view of another example of the arrangement member of the electric wire fixing structure according to the present embodiment, when an inner fixing portion is fixed to an inner electric wire. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the electric wire fastening structure according to the present embodiment will be described in detail with reference to the drawings. Note that the dimensional proportions in the drawings are exaggerated for the convenience of explanation and may differ from the actual proportions.

[0010] As shown in Fig. 1, the electric wire fixing structure 1 according to this embodiment is applied to a connector 5 for high-speed communication transmission that performs information communication between two electric components (not shown), such as a power source and a device, or between two devices. The connector 5 is provided at the end of an electric wire 3 that is electrically connected to one electric component. The connector 5 is capable of mating with a mating connector (not shown) that is electrically connected to the other electric component. By mating the connector 5 with the mating connector, the connector 5 is electrically connected to the mating connector, enabling information communication between the two electric components.

[0011] As shown in FIGS. 1 to 13, the electric wire fixing structure 1 includes an electric wire 3 and a connector 5.

[0012] As shown in FIGS. 1 to 8, the electric wire 3 includes an inner electric wire 7 and a sheath portion 9. The inner electric wire 7 and the sheath portion 9 are made of a material such as aluminum.

[0013] The inner wire 7 is made up of, for example, a core wire 11 formed by twisting together a plurality of wires made of a conductive material, and an insulating coating 13 made of an insulating material such as synthetic resin that covers the outer periphery of the core wire 11. One end of the inner wire 7 is electrically connected to one of the electrical components. Two inner wires 7 are twisted together and bundled together, and the outer periphery is covered by a sheath portion 9.

[0014] The sheath 9 is made of an insulating material such as synthetic resin. The sheath 9 is arranged so as to cover the outer periphery of the two twisted inner wires 7. The inner wires 7 are exposed at one end of the sheath 9.

[0015] An electric wire 3 in which the outer peripheries of two twisted inner electric wires 7 are covered with a sheath portion 9 is called a twisted pair cable. The number of inner electric wires 7 may be any number, for example, two pairs for a total of four, or four pairs for a total of eight. An electric wire 3 that does not have a shielding member (not shown) such as a braid or metal foil covering the outer peripheries of the inner electric wires 7 is also called a UTP (Unshielded Twist Pair) cable. The electric wire 3 may also be an STP (Shielded Twist Pair) cable in which the outer peripheries of the inner electric wires 7 are covered with a shielding member. A connector 5 is provided at the terminal portion of the electric wire 3.

[0016] As shown in FIGS. 1 to 7 and 9 to 13, the connector 5 includes an outer housing 15, inner terminals 17, an inner housing 19, outer terminals 21, and a positioning member .

[0017] The outer housing 15 is made of an insulating material such as synthetic resin. The outer housing 15 is provided with a mating portion 25 that can be mated with a mating housing (not shown) of a mating connector. The outer housing 15 is provided with an elastically deformable locking arm 27 that maintains the mated state with the mating housing. The outer housing 15 accommodates the inner terminal 17, inner housing 19, outer terminal 21, and arrangement member 23 that are assembled to the end portion of the electric wire 3, and the electric wire 3 is drawn out to the outside.

[0018] The inner terminal 17 is made of a conductive material and is a female terminal having a box-shaped connecting portion. The inner terminal 17 is disposed at the end portion of each of the multiple (here, two) untwisted inner electric wires 7 exposed from the sheath portion 9 at the end portion of the electric wire 3. The inner terminal 17 is electrically connected to the inner electric wire 7 by crimping a crimping portion 29 consisting of a crimping piece to the core wire 11 exposed from the insulating coating 13 of the inner electric wire 7. When the connector 5 and the mating connector are mated, the inner terminal 17 is electrically connected to a male mating terminal (not shown) of the mating connector having a tab-shaped connecting portion, and the two electrical components are electrically connected. The inner terminal 17 is housed in an inner housing 19.

[0019] The inner housing 19 is made of an insulating material such as synthetic resin. The inner housing 19 is formed in a cylindrical shape to have a plurality of (two in this case) terminal accommodating chambers 31 that can accommodate a plurality of (two in this case) inner terminals 17, respectively. The terminal accommodating chambers 31 of the inner housing 19 are provided with elastically deformable locking lances 33 that engage with the inner terminals 17 and hold the inner terminals 17 in the inner housing 19. The inner housing 19 is accommodated in the outer terminal 21, and maintains insulation between the inner terminal 17 and the outer terminal 21.

[0020] The outer terminal 21 is made of a conductive material and is formed in a cylindrical shape to accommodate the inner housing 19. The outer terminal 21 is provided with a locking protrusion 35 that engages with a locking lance (not shown) provided inside the outer housing 15 in an elastically deformable manner. The outer terminal 21 is held in the outer housing 15 by engagement between the locking lance and the locking protrusion 35. The outer terminal 21 is provided with a plurality of elastically deformable contact pieces 37 that come into contact with a mating shield member (not shown) of the mating connector. When the connector 5 and the mating connector are mated, the outer terminal 21 is electrically connected to the mating shield member to form a shield circuit. Forming a shield circuit prevents noise and the like from entering the inner terminal 17 and the mating terminal, and from leaking from the inner terminal 17 and the mating terminal. The outer terminal 21 is provided with an arrangement / connection portion 39 consisting of a pair of crimping pieces. The arrangement connection portion 39 fixes the outer terminal 21 and the arrangement member 23 together by crimping the pair of crimping pieces onto the outer periphery of the arrangement member 23 , and also electrically connects the outer terminal 21 and the arrangement member 23 together.

[0021] The placement member 23 is made of a conductive material and includes a sheath fixing portion 41 , an inner fixing portion 43 , and a terminal connecting portion 45 .

[0022] The sheath fixing portion 41 has a pair of crimping pieces 47, 47 extending upward from both side surfaces of the bottom wall. The sheath fixing portion 41 is arranged on the outer periphery of the sheath portion 9 of the electric wire 3, and the pair of crimping pieces 47, 47 are crimped to the outer periphery of the sheath portion 9 so that their tips align. By crimping the pair of crimping pieces 47, 47 to the sheath portion 9, the arrangement member 23 is fixed to the electric wire 3 via the sheath fixing portion 41.

[0023] The internal fixing portion 43 is formed of a single member that is continuous with the sheath fixing portion 41 via the bottom wall, and has a pair of crimping pieces 49, 49 that extend upward from both side surfaces of the bottom wall. One of the pair of crimping pieces 49, 49 is formed longer than the other. The internal fixing portion 43 is disposed around the outer periphery of the inner electric wires 7 exposed from the sheath portion 9 of the electric wire 3, and is crimped around the outer periphery of the insulating coatings 13 of the multiple inner electric wires 7 so that one crimping piece 49 overlaps the other crimping piece 49. By crimping the pair of crimping pieces 49, 49 to the inner electric wires 7, the arrangement member 23 is fixed to the electric wire 3 via the internal fixing portion 43. The pair of crimping pieces 49, 49 of the internal fixing portion 43 are crimped around the multiple inner electric wires 7 exposed from the sheath portion 9 at the portion where the multiple inner electric wires 7 are twisted. As a result, the twist of the multiple internal electric wires 7 exposed from the sheath portion 9 can be maintained, fluctuations in impedance of the multiple internal electric wires 7 exposed from the sheath portion 9 can be suppressed, and the internal electric wires 7 can be protected by the arrangement member 23.

[0024] In this way, the positioning member 23 is fixed to the electric wire 3 via the sheath fixing portion 41 and the inner fixing portion 43, so that when a tensile force is applied to the electric wire 3, the tensile force can be distributed to the sheath fixing portion 41 and the inner fixing portion 43. By distributing the tensile force to the sheath fixing portion 41 and the inner fixing portion 43, it is possible to suppress fluctuations in the positioning position of the positioning member 23 with respect to the inner electric wire 7 exposed from the sheath portion 9, and it is possible to stabilize the protection of the inner electric wire 7 by the positioning member 23. In addition, since the tensile force is not applied only to the sheath fixing portion 41, it is possible to suppress elongation of the sheath portion 9 that would reduce its wall thickness, and it is possible to stabilize the protection of the inner electric wire 7 by the sheath portion 9.

[0025] Here, as shown in FIG. 12 , the internal fixed portion 43 may be crimped to the multiple inner wires 7 so that the pair of crimping pieces 49, 49 have the same length and their tips are aligned. Alternatively, as shown in FIG. 13 , the internal fixed portion 43 may be crimped to the multiple inner wires 7 so that the pair of crimping pieces 49, 49 have different lengths and their tips are close to each other. The fixing force of the arrangement member 23 to the wires 3 can be adjusted by adjusting the height H of the internal fixed portion 43 when the pair of crimping pieces 49, 49 are crimped to the multiple inner wires 7. For example, the fixing force can be increased by decreasing the height H, and the fixing force can be decreased by increasing the height H. Adjusting the height H makes it possible to adjust the distribution of the tensile force between the sheath fixing portion 41 and the internal fixed portion 43.

[0026] The terminal connection portion 45 is formed as a single member that is continuous with the sheath fixing portion 41 and the inner fixing portion 43 via the bottom wall and is disposed between the sheath fixing portion 41 and the inner fixing portion 43. The terminal connection portion 45 has a pair of connection pieces 51, 51 extending upward from each side of the bottom wall. The pair of connection pieces 51, 51 are plastically deformed so that their tips align, thereby forming the terminal connection portion 45 into an annular shape with a larger diameter than the sheath fixing portion 41. The terminal connection portion 45 is accommodated in the outer terminal 21 so that its outer surface contacts the inner surface of the outer terminal 21, electrically connecting the outer terminal 21 and the arrangement member 23. By electrically connecting the outer terminal 21 and the arrangement member 23, a shielded circuit can be formed from the inner wire 7 exposed from the sheath portion 9 to the inner terminal 17, thereby expanding the range of the shielded circuit. The arrangement member 23 on which the terminal connection portion 45 is provided is prevented from shifting in its arrangement position due to tensile force by the inner fixing portion 43. Therefore, contact between the outer terminal 21 and the terminal connecting portion 45 can be maintained, and the reliability of the electrical connection between the outer terminal 21 and the arrangement member 23 can be maintained.

[0027] As an example of assembling such an electric wire fixing structure 1, first, a predetermined length of the sheath portion 9 is stripped from the end portion of the electric wire 3. Next, the arranging member 23 is arranged over the sheath portion 9 and the exposed multiple inner electric wires 7. Next, the sheath fixing portion 41 of the arranging member 23 is fixed to the outer periphery of the sheath portion 9, and the inner fixing portion 43 of the arranging member 23 is fixed to the outer periphery of the multiple inner electric wires 7. At this time, the terminal connection portion 45 of the arranging member 23 is formed into an annular shape. Next, a predetermined length of the insulating coating 13 is stripped from the end portion of the inner electric wire 7. Next, the crimping portion 29 of the inner terminal 17 is crimped to the exposed core wire 11 of the inner electric wire 7. Next, the inner terminal 17 is accommodated in the inner housing 19. Next, the inner housing 19 is accommodated in the outer terminal 21. Next, the arranging connection portion 39 of the outer terminal 21 is fixed to the arranging member 23. Then, the outer terminal 21 is housed in the outer housing 15, completing the assembly.

[0028] Such an electric wire fixing structure 1 includes an electric wire 3 having a sheath portion 9 covering the outer periphery of a plurality of inner electric wires 7, and an arrangement member 23 that is arranged on the sheath portion 9 and the inner electric wires 7 exposed from the sheath portion 9 relative to the outer periphery of the electric wire 3. The arrangement member 23 has a sheath fixing portion 41 fixed to the sheath portion 9 and an inner fixing portion 43 fixed to the plurality of inner electric wires 7.

[0029] Because the positioning member 23 is fixed to the electric wire 3 via the sheath fixing portion 41 and the inner fixing portion 43, when a tensile force is applied to the electric wire 3, the tensile force can be distributed to the sheath fixing portion 41 and the inner fixing portion 43. By distributing the tensile force to the sheath fixing portion 41 and the inner fixing portion 43, fluctuations in the positioning position of the positioning member 23 with respect to the inner electric wire 7 exposed from the sheath portion 9 can be suppressed, and protection of the inner electric wire 7 by the positioning member 23 can be stabilized. In addition, tensile force is not applied only to the sheath fixing portion 41, and stretching of the sheath portion 9 that would reduce the wall thickness is suppressed, and protection of the inner electric wire 7 by the sheath portion 9 can be stabilized.

[0030] Therefore, in such an electric wire fixing structure 1, the internal electric wire 7 can be stably protected.

[0031] An inner terminal 17 is electrically connected to an end portion of the inner wire 7 exposed from the sheath portion 9. The inner terminal 17 is accommodated in an inner housing 19 made of an insulating material. The inner housing 19 is accommodated in an outer terminal 21. The arrangement member 23 is made of a conductive material and has a terminal connection portion 45 electrically connected to the outer terminal 21.

[0032] By electrically connecting the arrangement member 23 to the outer terminal 21, a shield circuit can be formed from the inner wire 7 exposed from the sheath portion 9 to the inner terminal 17, thereby expanding the range of the shield circuit. In addition, the arrangement member 23 has its position prevented from changing due to tensile force by the internal fixing portion 43, so that the position of the terminal connecting portion 45 relative to the outer terminal 21 can be prevented from changing, and the reliability of the electrical connection between the outer terminal 21 and the arrangement member 23 can be maintained.

[0033] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment.

[0034] For example, the terminal connection portion of the positioning member is formed in a ring shape so as to be accommodated in the outer terminal, but this is not limited to this. For example, the terminal connection portion may be an elastically deformable contact piece that comes into contact with the outer surface of the outer terminal, and the terminal connection portion may have any shape. [Explanation of symbols]

[0035] 1 Wire fixing structure 3 electric wire 7 Internal Wires 9 Sheath 17 Inner terminal 19 Inner housing 21 Outer terminal 23 Placement components 41 Sheath fixing part 43 Internal fixing part 45 Terminal connection part

Claims

1. an electric wire having a sheath portion covering the outer periphery of a plurality of inner electric wires; a positioning member that is arranged around the outer periphery of the electric wire, the sheath portion, and the inner electric wire exposed from the sheath portion; Equipped with The arrangement member is an electric wire fixing structure having a sheath fixing portion fixed to the sheath portion and an internal fixing portion fixed to the plurality of internal electric wires.

2. an inner terminal is electrically connected to an end portion of the inner wire exposed from the sheath portion; The inner terminal is accommodated in an inner housing made of an insulating material, The inner housing is accommodated in the outer terminal, The electric wire fixing structure according to claim 1 , wherein the arrangement member is made of a conductive material and has a terminal connection portion electrically connected to the outer terminal.

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