JP4818151B2 - Outer conductor terminal and shield connector - Google Patents

Description

  The present invention relates to an outer conductor terminal connected to an electric wire having a shield conductor made of a braided wire and a shield connector using the outer conductor terminal.

  In general, the coaxial wire is coated on the outer surface of the core wire with an insulating endothelium, and the outer surface of the inner skin is covered with a shield conductor such as a braided wire in order to block electric noise such as electromagnetic waves and static electricity. The outside of the wire is covered with an insulating sheath. In order to connect the coaxial line to the counterpart device, the outer conductor terminal and the inner conductor terminal are connected to the end portions. Conventionally, as an outer conductor terminal connected to an end of a coaxial line, a coaxial line shield terminal and a coaxial line shield connector to which the shield terminal is connected are known (see, for example, Patent Document 1).

  When attaching the shield terminal for coaxial cable to the end of the coaxial cable, the insulation sheath of the coaxial cable is peeled to expose the braided wire, and the connection consisting of the U-shaped metal piece of the shield terminal from above the exposed braided wire The shield terminal and the braided wire are electrically connected by crimping the pieces in a ring shape.

Japanese Patent Laying-Open No. 2005-93173 (FIG. 2)

  When a coaxial line is used, it is necessary to increase the fixing force of the coaxial line in order to prevent the coaxial line from coming out of the shield terminal when a force is applied to the connecting portion with the shield terminal by being pulled strongly. In order to increase the fixing force of the coaxial line, for example, it is conceivable to strongly crimp the shield terminal and to strongly press the coaxial line. However, the inner wall of the coaxial wire is made of a flexible material such as polyethylene, and if the pressure-bonding force is increased, the flexible insulator will be crushed. .

  The problem to be solved by the present invention is to connect an electric wire having a braided wire without adversely affecting the lower layer of the braided wire when connecting an electric wire having a braided wire like an insulator of a coaxial wire to an outer conductor terminal. It is an object of the present invention to provide an outer conductor terminal and a shield connector capable of improving the fixing force.

  In order to solve the above problems, the outer conductor terminal of the present invention is an outer conductor terminal in which a mesh-shaped knurled groove is provided on the inner surface side of the braided wire crimping portion of the wire barrel. The gist is that the mesh angles of the knurled grooves are matched.

  In the outer conductor terminal of the present invention, the mesh angle of the knurled groove is preferably 15 degrees to 30 degrees.

  The outer conductor terminal of the present invention can be configured as a coaxial line shield terminal in which a terminal body for accommodating an inner conductor terminal connected to a core wire of a coaxial line is connected to a wire barrel.

  The gist of the shield connector of the present invention is to use the outer conductor terminal.

  According to the outer conductor terminal and the shield connector according to the present invention, by adjusting the mesh angle of the knurled groove to the braided angle of the braided wire, the braided wire can easily enter the knurled groove. When connecting the electric wire having the outer conductor terminal, it is possible to improve the fixing force with the electric wire having the braided wire without adversely affecting the lower layer of the braided wire. In addition, since the adhesive strength between the braided wire and the outer conductor terminal can be increased without crushing the insulator such as the coaxial cable, the insulation and shielding properties are not lowered, and the high frequency characteristics and electrical reliability are good. Connection can be made.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view showing a coaxial line shield terminal and a coaxial line as an embodiment of the outer conductor terminal of the present invention. As shown in FIG. 1, the shield terminal 1 for coaxial lines is obtained by punching a metal plate and then bending it by press molding or the like. The shield terminal 1 includes a cylindrical terminal body 2 having front and rear openings for accommodating the inner conductor terminal 20 connected to the core wire 11 of the coaxial line 10 and a lower portion of the rear end of the terminal body 2. It has the wire barrel 3 which consists of the braided wire crimping part 31 and the insulation sheath crimping part 32 which were continuously arranged in the back. The terminal body 2 has a joint 2a that is provided with a slit or the like (not shown) so as to be elastically reduced in diameter, and is formed as a fitting part with a mating terminal (not shown). ing. In the present invention, for convenience, the side of the coaxial line shield terminal 1 connected to the counterpart terminal is referred to as the front side. As shown in FIG. 1, the end of the coaxial line 10 is connected to the coaxial line shield terminal 1. Hereinafter, the coaxial line will be described.

  As shown in FIG. 1, the coaxial wire 10 includes an inner wire 13 in which a plurality of metal wires are twisted and bundled and an outer periphery of a conductive core wire 11 is covered with an insulator 12. This is a shielded electric wire having a coaxial structure comprising a conductive braided wire 14 formed by braiding a plurality of strands covering the outer periphery and an insulating sheath 15 covering the outer periphery of the braided wire 14. The coaxial wire 10 is excellent in high-frequency characteristics because the outer periphery of the core wire 11 as a signal conductor is covered with a braided wire 14 as a shield conductor with a certain interval through an insulator 12.

  As shown in FIG. 1, the coaxial line 10 has a terminal processed for connection to the coaxial line shield terminal 1. That is, the insulation sheath 15 at the end of the coaxial line 10 is peeled by a predetermined length to expose the lower braided wire 14, and the braided wire 14 and the insulator 12 on the distal end side of the coaxial line 10 are further peeled off. An inner conductor terminal 20 is attached to the exposed core wire 11. To connect the coaxial line 10 to the shield terminal 1 for coaxial line, the braided wire 14 of the coaxial line 10 is crimped to the braided wire crimping part 31 of the wire barrel 3 and the insulating sheath 15 is crimped to the insulating sheath crimping part 32. .

  FIG. 2 is a plan view showing a part of a braided wire for explaining a braided angle of the coaxial braided wire. As shown in FIG. 2, the knitting angle α of the strands of the braided wire 14 includes a parallel line x parallel to the length direction of the coaxial line 10 indicated by an arrow X in the figure, and a strand 14 a constituting the braided wire 14. Is the angle made between. The knitting angle of the strands knitted so as to be oblique to the right with respect to the parallel line x is the same as the knitting angle of the strands knitted so as to be oblique to the left with respect to the parallel line x. . The knitting angle of the strand is usually formed between 15 and 30 degrees. In the present invention, the knitting angle of the braided wire refers to the knitting angle of the strand.

  FIG. 3 is a development view showing a wire barrel portion of the coaxial cable shield terminal of FIG. As shown in FIGS. 1 and 3, a wire barrel 3 is continuously provided on one end side of the terminal body 2. The braided wire crimping portion 31 of the wire barrel 3 is formed in a substantially U shape, and includes a bottom portion 31a and both arm portions 31b and 31b rising on both sides of the bottom portion 31a, and a space between both arm arm portions 31b and 31b is opened. is doing. On the opposite side of the braided wire crimping portion 32 of the wire barrel 3 from the terminal body 2, an insulating sheath crimping portion 32 is provided. The insulating sheath crimping part 32 is also formed in a substantially U shape like the braided wire crimping part 31, and comprises a bottom part 32a and both arm parts 32b, 32b rising on both sides of the bottom part 32a, and between the arm parts 32b, 32b. Is open. The wire barrel 3 is provided with rectangular through holes 31c and 32c.

  As shown in FIG. 1, the braided wire crimping portion 32 of the wire barrel 3 is provided with a mesh-like knurled groove 4 on the inner surface side in contact with the braided wire 14 in order to increase the fixing force with respect to the coaxial line. As illustrated in FIG. 3, the knurled groove 4 is provided on the entire surface of the bottom portion 31 a and both arm portions 31 b on the inner surface side of the braided wire crimping portion 3. 4A is a plan view showing an enlarged state of the inner surface side of the braided wire crimping portion of the coaxial cable shield terminal of FIG. 3, and FIG. 4B is a sectional view taken along line BB of FIG. 4A. It is. As shown in FIG. 4 (a), the mesh-shaped knurled groove 4 is diagonally right with a predetermined angle β in one direction with respect to a parallel line x parallel to the longitudinal direction of the coaxial line indicated by the arrow X in the figure. The right oblique groove 4a in which a plurality of linear grooves are arranged in parallel, and the left oblique line crossing the right oblique groove 4a and having a predetermined angle β in the other direction with respect to the parallel line x It is comprised from the left diagonal ditch | groove 4b arrange | positioned so that a shape ditch | groove may become mutually parallel. The entire shape of the knurled groove 4 formed by the right oblique groove 4a and the left oblique groove 4b is formed in a shape in which a large number of rhombuses are arranged as shown in FIG. The angle β is referred to as a knurled groove mesh angle.

  The shield terminal of this embodiment uses the coaxial wire 10 in which the braided wire 14 has a knitting angle α of 20 degrees, and the mesh angle β of the knurled groove 4 of the shield terminal 1 is 20 degrees. The knitting angle of the coaxial braided wire is usually about 15 to 30 degrees, whereas the knurled groove has a mesh angle of about 45 degrees. The angle and the knitting angle of the braided line were greatly different. The present invention only needs to be formed by matching the knitting angle of the braided wire of the coaxial wire used with the mesh angle of the knurled groove, and the mesh angle of the knurled groove is not limited to 20 degrees. In combination, it can be usually formed within a range of 15 to 30 degrees. When the mesh angle of the knurled groove is matched with the knitting angle of the braided wire of the coaxial line, the mesh angle of the knurled groove and the knitting angle of the braided wire include substantially the same angle, in addition to the same angle.

  Further, as shown in FIG. 4B, the interval S between the right oblique grooves 4a provided in parallel is formed to be about 0.3 mm. Further, the interval S between the left oblique grooves 4b is also formed in the same size. A smaller knurling groove spacing S can increase the number of knurling grooves and increase the wire fixing force. The knurled groove 4 can be formed, for example, by pressing with a mold provided with a ridge corresponding to the shape of the groove. The distance S of about 0.3 mm is the minimum distance at which a mold for knurling can be created.

  As shown in FIG. 4B, the cross-sectional shape of the knurled groove 4 (the right oblique groove 4a and the left oblique groove 4b) has a tapered side wall so that the upper side of the groove is widened, and the bottom is flat. It is formed in a shape having a bottom. The depth and width of the knurled groove 4 can be appropriately determined according to the thickness of the strand of the braided wire 14 and the like. That is, the depth and width of the knurled groove 4 need only be formed so that the strands of the braided wire 14 can enter the knurled groove 4. Specifically, the knurled groove 4 preferably has a depth that is at least equal to the radius of the cross section of the strands constituting the braided wire 14.

  To connect the braided wire 14 to the coaxial cable shield terminal 1, the wire barrel 3 of the coaxial wire shield terminal 1 is fitted into the coaxial wire 10, and the braided wire 14 is sandwiched between the braided wire crimping portions 31 to crimp the insulation sheath. The braided wire crimping portion 31 and the insulating sheath crimping portion 32 are crimped so as to form an annular shape by crimping the insulating sheath 15 between the portions 32. FIG. 5 is a cross-sectional view schematically showing a portion where a braided wire of a coaxial wire is caulked by a braided wire crimping portion of a wire barrel of a shield terminal for a coaxial wire. As shown in FIG. 5, a part of the braided wire 14 of the coaxial wire 10 is crimped in a state where it enters the knurled groove 4 formed on the inner surface of the braided wire crimping portion 31 of the coaxial wire shield terminal. When the braided wire 14 enters the knurled groove 4 of the braided wire crimping portion of the wire barrel 3, the shield terminal 1 and the coaxial wire 10 can be reliably brought into close contact with each other, so that the wire fixing force is improved. In the present invention, since the mesh angle of the knurled groove 4 is matched to the braided angle of the braided wire 14 in this way, when the braided wire 14 is crimped by the braided wire crimping portion 31, a part of the braided wire 14 is placed in the knurled groove 4. Is easier to enter. On the other hand, when the mesh angle of the knurled groove 4 is greatly different from the braided angle of the braided wire 14, the braided wire 14 is less likely to enter the knurled groove 4, so that the effect of improving the wire fixing force cannot be obtained. .

Example 1
A knurled groove with a mesh angle of 20 degrees is used as a shield terminal provided at the braided wire crimping portion of the wire barrel, using a coaxial line with a braided wire knitting angle of 20 degrees, and the insulation sheath of the coaxial line is peeled off and braided The portion where the wire was exposed was crimped to the braided crimping portion, and a tensile test was performed to measure the wire fixing force.

Comparative Example 1
A coaxial wire having a braid angle of 20 degrees of the same braided wire as in Example 1 above is crimped to a shield terminal formed in the same manner as in Example 1 except that the mesh angle of the knurled groove is 45 degrees, A tensile test was performed to measure the wire adhesion force. As a result, in Example 1 in which the mesh angle of the knurled groove is matched to the braided wire strand angle, the wire fixing force is greater than that in Comparative Example 1 in which the mesh angle of the knurled groove is different from the braided wire knitting angle. Was big.

  In the above embodiment, the coaxial wire shield terminal has been described as an example of the outer conductor terminal. However, the outer conductor terminal of the present invention can be used as an outer conductor terminal for shield wires other than the coaxial wire. In short, as long as it is for connection of an electric wire having a shield conductor made of a braided wire, it can be applied to other than the coaxial line.

  The shield connector of the present invention is not limited as long as it uses the outer conductor terminal, and may be composed of only the coaxial cable shield connector of the above embodiment. For example, the inside of the terminal body of the coaxial cable shield terminal A dielectric may be accommodated in the dielectric, and an inner conductor terminal may be attached and fixed inside the dielectric, and other various shield connector structures may be used.

  The coaxial line terminal and the coaxial line connector of the present invention can be optimally used as a shield terminal and a shield connector for an electrical signal transmission coaxial line between electrical components mounted on an automobile.

It is an external appearance perspective view which shows the shield terminal for coaxial lines which is one Example of the outer conductor terminal of this invention, and a coaxial line. It is a top view which shows a part of braided wire for demonstrating the braid angle of the braided wire of a coaxial line. It is an expanded view which shows the part of the wire barrel of the shield terminal for coaxial lines of FIG. (A) is a top view which shows the state which expanded the inner surface side of the braided wire crimping | compression-bonding part of the shield terminal for coaxial lines of FIG. 3, (b) is BB sectional drawing of Fig.4 (a). It is sectional drawing which shows typically the part which crimped the braided wire of the coaxial line with the braided wire crimping part of the wire barrel of the shield terminal for coaxial lines.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield terminal for coaxial wires 2 Terminal body 3 Wire barrel 4 Knurled groove 10 Coaxial wire 11 Core wire 12 Insulator 14 Braided wire 15 Insulating sheath 31 Braided wire crimping part α Braided wire braid angle β Knurled groove mesh angle

Claims (4)

  In an outer conductor terminal in which a mesh-shaped knurled groove is provided on the inner surface side of the braided wire crimping portion of the wire barrel, the outer conductor is characterized in that the mesh angle of the knurled groove is adjusted to the knitting angle of the strand of the braided wire Terminal.   The outer conductor terminal according to claim 1, wherein a mesh angle of the knurled groove is 15 degrees to 30 degrees.   The outer conductor according to claim 1 or 2, wherein a terminal body for accommodating an inner conductor terminal connected to a core wire of the coaxial line is a shield terminal for a coaxial line connected to a wire barrel. Terminal.   An outer conductor terminal according to claim 1 is used.

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