JP2020035617A - Connection structure of cable terminal - Google Patents

Abstract

To provide a connection structure of a cable terminal in which the characteristic impedance does not change even when a connection cable does not have a shield structure, and the terminal of the connection cable is securely connected to the connector.SOLUTION: A cylindrical insulating sleeve made of a synthetic resin material with a higher longitudinal modulus of elasticity E than that of the inner sheath is inserted between an inner sheath and an outer sheath, and a crimp fitting fixed to a connector is crimped along the periphery of the outer sheath sandwiched with the hard insulating sleeve and the outer sheath of the connection cable is firmly fixed to the connector. Since the insulating sleeve has a lower dielectric constant than the metal sleeve, there is no impedance mismatch with a connection cable having no shield structure.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connection structure of a cable terminal for connecting a terminal of a connection cable for transmitting a high-frequency signal to a connector, and more particularly to a connection structure of a cable terminal for connecting a terminal of a connection cable having no shield structure to the connector. .

  2. Description of the Related Art Conventionally, a coaxial cable for transmitting a high-frequency signal has a connector connected to a terminal of the coaxial cable, and the connector is fitted and connected to a mating connector on the electronic device side, so that the coaxial cable is detachably connected to the electronic device. As shown in FIG. 12A, the connection between the coaxial cable and the connector exposes a core wire 100a through which a high-frequency signal flows and an insulating inner sheath 100b covering the periphery thereof, as shown in FIG. As shown in FIG. 3B, a cylindrical metal sleeve 101 is sandwiched between an insulated inner sheath 100b and a braided wire 100c surrounding and shielding the inner sheath 100b. Thereafter, the exposed core wire 100a is electrically connected to a conductive terminal of a connector (not shown) by soldering, crimping, or the like, and the crimping fitting 102 fixed to the connector is connected to the outer skin 100d as shown in FIG. It is crimped along the periphery and crimped to the outer skin 100d.

The crimping fitting 102 is crimped around the outer skin 100d with the braided wire 100c and the outer skin 100d sandwiched between the hard metal sleeve 101, so that the braided wire 100c and the outer skin 100d are firmly fixed to the connector, Even if the coaxial cable 100 is inadvertently pulled with a large force, no external force is transmitted to the electrical connection between the core wire 100a and the conductive terminal, and the reliability of the electrical connection can be ensured. The conductive metal sleeve 101, like the braided wire 100c, since surround at regular intervals around the core 100a, a metal sleeve 101 in position with interpolation narrow, large changes characteristic impedance _{Z 0} of the coaxial cable 100 without having to, there is no mismatch between the characteristic impedance Z _0.

  On the other hand, in recent years, inexpensive connection cables without a shield structure for protecting against external noise have been used as connection cables for transmitting high-frequency signals between electronic devices. As such a connection cable, for example, a UTP (Unshielded Twist Pair) cable is obtained by twisting two cable cores each having a conductive core covered with an insulating inner sheath, and further wrapping the outside with an insulating sheath. It is covered and integrated.

When the above-described conventional metal sleeve 101 is used in order to firmly connect a connection cable having no shield structure to a connector, the capacitance C ₀ increases at the position where the metal sleeve 101 is disposed, and the shield cable does not have the shield structure. Ann matching of the characteristic impedance Z ₀ of the other part occurs. Therefore, conventionally, the metal sleeve 101 is not pinched between the ends of the connection cable, and the crimp fitting fixed to the connector is crimped along the outer periphery of the connection cable to be crimped to the outer cover, and the connection cable is connected to the connector. are doing.

JP 2008-123914 A

  However, when crimping is performed by crimping a crimping fitting to the outer skin of a connection cable without a shield structure without using a metal sleeve, the outer sheath or inner sheath that constitutes the connection cable has a modulus of longitudinal elasticity such as urethane or vinyl chloride. Since E is made of a soft synthetic resin material with low E, the radial strain caused by caulking the crimp fitting is absorbed by the shrinkage strain of the outer and inner sheaths, and there is sufficient friction between the laminated layers that overlap in the radial direction. No force can be generated, and for example, a tensile strength of 10 kgf or more required for a connection cable for a vehicle cannot be obtained. As a result, when the connection cable is pulled with a particularly strong force, an external force in the direction in which the core wire is pulled out is transmitted to the electrical connection between the core wire and the conductive terminal of the connector, and the electrical connection between the two is interrupted or the conductive terminal is deformed. Could be damaged.

  In the case where the connection cable is a cable in which the outsides of a plurality of cable cores are covered with an outer sheath, such as a UTP cable, and the cable is integrated, the terminal of the outer sheath is peeled off, and the cores of the individual cable cores are removed. Since it is exposed and electrically connected to the corresponding conductive terminal, there is a problem that the distance between individual cable cores varies at the end of the connection cable, and the characteristic impedance changes.

  The present invention has been made in view of such conventional problems, and even if the connection cable does not have a shield structure, the characteristic impedance does not change and the terminal of the connection cable is firmly connected to the connector. It is an object of the present invention to provide a cable terminal connection structure.

  It is another object of the present invention to provide a cable terminal connection structure in which the characteristic impedance of the terminal portion of a connection cable in which the outsides of a plurality of cable cores are covered with a sheath and integrated is not significantly changed.

In order to achieve the above object, a connection structure for a cable terminal according to the first aspect of the present invention has a conductive core covered with an insulating inner sheath, and one or more cable cores are further covered with an insulating sheath. A connection cable, a connector having a conductive terminal mounted in an insulating housing, and a crimp fitting fixed to the connector, with the core wire electrically connected to the conductive terminal. A cable terminal connection structure for caulking and connecting a connection cable terminal to a connector,
A cylindrical insulating sleeve formed of a synthetic resin material having a higher modulus of longitudinal elasticity E than the inner sheath is inserted between the inner sheath and the outer skin, and a crimp fitting is provided along the periphery of the outer skin sandwiched between the inner sleeve and the outer sleeve. And crimped to the outer skin.

  Since the insulating sleeve is formed of a synthetic resin material having a higher modulus of longitudinal elasticity E than the inner sheath, the insulating sleeve or the inner sheath surrounded by the insulating sleeve does not absorb the strain caused by caulking the crimping fitting, The outer skin is compressed between the insulating sleeve and the crimp fitting with a high compressive force, and the connection cable is firmly connected to the crimp fitting fixed to the connector, thereby obtaining a high tensile strength for the connector.

  Since the insulating sleeve inserted between the inner sheath and the outer sheath has a lower dielectric constant than the conductive metal sleeve, the characteristic impedance does not change significantly with the other parts of the connection cable that does not have a shield structure. Signal loss can be suppressed.

  In the connection structure for a cable terminal according to the second aspect, the insulating sleeve is formed in a cylindrical shape surrounding a cable housing chamber for housing one or more cable cores, and communicates from one end opening of the cylindrical shape to the other end opening. Characterized in that an elongated gap is formed.

  Since the insulating sleeve has a long and narrow gap that communicates with the cylindrical opening from one end to the other end, when the crimping fitting is crimped along the outer skin, it contracts in the radial direction and compresses the inner sheath of the cable core. And comes in contact with the inner sheath with high frictional force.

  After stripping the end of the outer sheath, exposing the core of the cable core, and electrically connecting to the corresponding conductive terminal, the exposed cable core is accommodated in the cable accommodation chamber through the elongated gap, and the insulating sleeve is covered with the inner sheath. And can be inserted between the outer skin.

  Since one or more cable cores can be accommodated in a cable accommodation room in an aligned manner, the inductance does not change, and when a plurality of cable cores are accommodated, the core of each cable core is accommodated. Since the distance between them does not vary, the capacitance does not change, and the characteristic impedance does not change significantly.

  The cable terminal connection structure according to claim 3 is characterized in that a slit cut out from one end on the terminal side from which one or more cable cores are drawn out is formed in the outer sheath.

  The lead portion of one or more cable cores exposed from the outer cover can be drawn in a desired direction from the extension direction of the connection cable through a slit cut out from one end of the outer cover.

  The diameter of the terminal side of the outer skin is easily increased by the slit cut out from one end, so that the insulating sleeve can be easily inserted between the inner sheath and the outer skin.

  According to a fourth aspect of the present invention, the crimp fitting is fixed to the insulating housing and is integrally formed with a metal shield case surrounding the outer surface of the insulating housing.

  The crimp fitting is fixed to the insulating housing and is formed integrally with the metal shield case surrounding the outer surface of the insulating housing, so the crimp is fixed to the insulating housing in the pressing process of the shield case and the mounting process to the insulating housing Metal fittings can be formed.

The connection structure of a cable terminal according to claim 5, wherein the connection cable is formed by covering one or more cable cores in which a conductive core wire is covered with an insulating inner sheath and further covering the periphery of the cable core with an insulating outer sheath, and inside the insulating housing. A connector having a conductive terminal attached thereto, and a crimp fitting fixed to the connector. With the core wire electrically connected to the conductive terminal, the crimping fitting is crimped from around the outer skin to form a connection cable terminal. Connection structure of the cable terminal for connecting the to the connector,
Further comprising an insulating sleeve formed of a synthetic resin material having a higher longitudinal modulus of elasticity E than the outer skin and formed in a cylindrical shape surrounding the outer circumference of the outer skin, and having an elongated gap formed from one end opening of the cylindrical shape to the other end opening; It is characterized in that the metal fitting is crimped along the periphery of the insulating sleeve sandwiched between the outer shell and the metal fitting and crimped to the insulating sleeve.

  Since the insulating sleeve is made of a synthetic resin material having a higher longitudinal modulus of elasticity E than the outer skin, partial distortion due to caulking of the crimping bracket is not absorbed by the insulating sleeve or the outer skin surrounded by the insulating sleeve, and is elongated. The entire insulating sleeve with the gap formed contracts radially, compressing the entire opposing surface of the skin. As a result, the insulating sleeve and the outer skin come into contact with a high frictional force and are firmly connected to the crimp fitting fixed to the connector, so that a high tensile strength of the connection cable with respect to the connector is obtained.

  The crimping fitting is caulked along the insulating sleeve surrounding the outer skin, so the distance from the conductive core wire is far, and the characteristic impedance of the other parts of the connection cable without shield structure does not change significantly. In addition, signal loss due to impedance mismatching can be suppressed.

  A connection structure for a cable terminal according to a sixth aspect is characterized in that a wedge portion is formed on an inner wall surface of the cylindrical insulating sleeve so as to prevent a terminal portion of the outer sheath from coming off from the insulating sleeve.

  Since the insulating sleeve is formed of a synthetic resin material having a higher modulus of longitudinal elasticity E than the outer cover, the crimping fitting is crimped to cause the wedge portion to bite deeply from the surface of the outer cover, thereby firmly preventing the outer cover of the connection cable from coming off. .

  According to a seventh aspect of the present invention, the crimp fitting is fixed to the insulating housing and is integrally formed with a metal shield case surrounding an outer surface of the insulating housing.

  The crimp fitting is fixed to the insulating housing and is formed integrally with the metal shield case surrounding the outer surface of the insulating housing, so the crimp is fixed to the insulating housing in the pressing process of the shield case and the mounting process to the insulating housing Metal fittings can be formed.

  According to the first aspect of the invention, even if the connection cable does not have a shield structure, the terminal can be connected to the connector with high tensile strength without changing the characteristic impedance.

  According to the second aspect of the present invention, since the cable core and the insulating sleeve which are firmly connected to the crimp fitting fixed to the connector are in contact with a high frictional force, the cable core can be relatively firmly connected to the connector. .

  Since the core of the cable core can be electrically connected to the corresponding conductive terminal without attaching the insulation sleeve to the connection cable, the insulation sleeve does not hinder the connection work and increases the spacing between individual cable cores. Thus, the electrical connection between the core wire and the conductive terminal can be easily performed.

  In order to electrically connect the core wire to the conductive terminal, the characteristic impedance can be stabilized at one or two or more cable core wires exposed from the outer sheath, so that impedance mismatching does not occur.

  According to the third aspect of the present invention, it is possible to pull out the lead-out portion of one or more cable cores exposed from the outer cover in an arbitrary direction that facilitates an electrical connection operation with the conductive terminal.

  Further, since the diameter of the terminal side of the outer skin is easily enlarged by the slit being cut out, the insulating sleeve can be inserted between the inner sheath and the outer skin with a low insertion force.

  According to the fourth and seventh aspects of the present invention, since the crimping fitting is formed integrally with the shield case fixed to the insulating housing, the number of parts does not increase, and the pressing process of the shield case and the mounting to the insulating housing are performed. A crimp fitting fixed to the insulating housing in the process can be formed.

  According to the invention of claim 5, even if the connection cable does not have the shield structure, the terminal can be connected to the connector with high tensile strength without changing the characteristic impedance.

  According to the invention of claim 6, the connection cable is more reliably prevented from coming off from the connector, and a high tensile strength is obtained for the connector.

It is a perspective view of connection structure 1 of the cable terminal concerning a 1st embodiment of the present invention which cuts and shows connection cable 10. 1 is a longitudinal sectional view of a connection structure 1 of a cable terminal cut along a connection direction of a connection cable 10. It is sectional drawing of the connection structure 1 of the cable terminal cut | disconnected by the AA of FIG. FIG. 3 is a perspective view of an insulating sleeve 3. FIG. 3 is a perspective view showing a state where an insulating sleeve 3 is inserted between an inner core wire 11 and an outer cover 14. FIG. 2 is a perspective view of a connector module 20a connected to a terminal of a connection cable 10. FIG. 9 is a longitudinal sectional view of a connection structure 6 of a cable terminal according to a second embodiment of the present invention, taken along a connection direction of a connection cable 10. FIG. 8 is a cross-sectional view of the cable terminal connection structure 6 taken along line BB in FIG. 7. (A) of the insulating sleeve 7 is a perspective view, and (b) is a longitudinal sectional view. FIG. 4 is a perspective view showing a state in which an insulating sleeve 7 is arranged around an outer shell 14. FIG. 2 is a perspective view of a connector module 20a connected to a terminal of a connection cable 10. (A) of a conventional cable terminal connection structure for connecting a terminal of a coaxial cable 100 having a shield structure includes a coaxial cable 100 and a metal sleeve 101 exposing a core wire 100a and an inner sheath 100b, and (b) illustrates an internal structure. (C) is a perspective view showing a state where the metal sleeve 101 is inserted between the sheath 100b and the braided wire 100c, and a state where the metal sleeve 101 is crimped along the periphery of the outer cover 100d and pressed against the outer cover 100d. FIG.

   Hereinafter, a cable terminal connection structure 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. In this specification, the right side of FIG. 2 that is the connection direction of the connection cable 10 is the front, the left side of FIG. 2 that is the direction of pulling out the connection cable 10 is the rear, and each direction in FIG. The configuration of each section will be described as up, down, left, and right directions.

  As shown in FIG. 2, the connection structure 1 of the cable terminal according to the present embodiment has a structure in which the core wire 12 of the connection cable 10 is electrically connected to the conductive terminal 23 of the connector 20, and the connection cable is connected to the electrical connection portion. A crimping fitting for fixing the terminal of the connection cable 10 to the connector 20 so that an external force for pulling the connection cable 10 backward is not transmitted. 2 and a cylindrical insulating sleeve 3 shown in FIG.

  Here, the connection cable 10 is formed by twisting two cable cores 11 each having a conductive core wire 12 covered with an insulating inner sheath 13 made of polyethylene, and the outside of the cable core 11 being an insulating sheath 14 made of polyvinyl chloride. Is a UTP (Unshielded Twist Pair) cable 10 that is unified by covering with a cable and does not have a shield structure such as a grounded braided wire such as a coaxial cable. This cancels noise superimposed on the high-frequency signals flowing through the pair of core wires 12.

  As shown in FIG. 5, the front end of the outer cable 14 is used to electrically connect each core 12 of the two cable cores 11 to the conductive terminal 23 of the connector 20. The lead portions 11a of the two cable cores 11 are respectively pulled out in front of them, and the front ends of the inner sheaths 13 of the lead portions 11a are further peeled and the conductive terminals 23 are crimped to the exposed core wires 12. The barrel 23a is crimped, and the conductive terminals 23 are fixed to the respective core wires 12 and are electrically connected to each other.

  In addition, two slits 14a are cut away from the front end of the outer skin 14 from the front end toward the rear along the connection cable 10, and the crimp barrel 23a of the conductive terminal 23 is crimped to the core wire 12. At the time of the electrical connection work, the lead portion 11a of the cable core 11 can be pulled out in a direction that facilitates the electrical connection work through the slit 14a.

  The connector 20 includes an upper insulator 21a and a lower insulator 21b which are arranged vertically and an outer housing 21c formed into an external shape which is fitted to a mating connector (not shown) connected to the electronic device. A housing 21, two conductive terminals 23 sandwiched between an upper insulator 21 a and a lower insulator 21 b and fixed in the insulating housing 21, surrounding the upper insulator 21 a and the lower insulator 21 b, and crimping metal fittings rearward And a shield case 24 integrally having the two.

  As shown in FIG. 2, the upper insulator 21a and the lower insulator 21b are electrically conductive terminals connected to the two cable cores 11 of the connection cable 10 inserted from the rear and the core wire 12 of the cable core 11, respectively. 23 is positioned so that the conductive terminal 23 faces the terminal receiving hole 22 into which the plug terminal of the mating connector (not shown) is inserted.

  In the outer housing 21c of the insulating housing 21, a mounting hole 26 for positioning and housing a connector module 20a to be described later inserted from the rear is formed to penetrate in the front-rear direction. A cable insertion hole 26a for inserting a terminal portion of the connection cable 10 from the rear, and a plug insertion hole 26b for guiding a plug terminal of a mating connector (not shown) to the terminal receiving hole 22 are provided at the front.

  The insulating sleeve 3 is made of hard PBT (Polybutylene terephtalate) having a higher modulus of longitudinal elasticity than the inner sheath 13 made of polyethylene, as shown in FIG. A sleeve body 32 having an outer diameter equal to or slightly larger than the inner diameter of the outer sheath 14 of the connection cable 10 and a ring stopper portion 33 having an outer diameter larger than the outer diameter of the outer shell 14 are formed in front of the sleeve body 32. Have a cylindrical shape integrally formed. On the side of the cylindrical insulating sleeve 3, an elongated gap 34 communicating with the sleeve body 32 is formed from the front end to the rear end, and as shown in FIG. The lead portion 11a of the core wire 11 is arranged in the cable accommodation chamber 31 through the elongated gap 34 and can be wired.

  The cross-section orthogonal to the front-rear direction of the cable storage chamber 31 has an elliptical shape in which the height in the vertical direction is substantially equal to the outer diameter of the cable core 11 and the lateral width in the left-right direction is twice the outer diameter. In addition, the two cable cores 11 can be arranged in parallel in the left-right direction in the cable storage chamber 31 and wired.

  As shown in FIG. 6, the crimp fitting 2 is formed by punching a single conductive metal plate together with the shield case 24, and as shown in FIG. 6, the lower surface and the left and right side surfaces of the shield case 24 surrounding the rectangular parallelepiped periphery of the upper insulator 21a and the lower insulator 21b. From the connector module 20a, which will be described later, is crimped along the circumference of the outer periphery of the outer cover 14 of the connection cable 10 and crimped to the outer cover 14. Formed.

  Hereinafter, an assembling process of electrically connecting the core wire 12 of the connection cable 10 to the conductive terminal 23 of the connector 20 and fixing the terminal of the connection cable 10 to the connector 20 will be described.

  First, the connection between the connection cable 10 and the connector 20 is performed by peeling the outer sheath 14 of the terminal portion in front of the connection cable 10 and the inner sheath 13 of the two cable core wires 11 inside the outer sheath 14, The core wire 12 is exposed at the front end thereof and the lead wire 11a of each cable core 11 is extended through the slit 14a, and the crimp barrel 23a of the conductive terminal 23 is crimped to the core wire 12 exposed at the tip. Thus, the core wire 12 and the conductive terminal 23 are fixed and electrically connected to each other.

  After crimping the conductive terminal 23 to each core wire 12, the drawn-out portion 11a expanded through the slit 14a is returned to be wired in parallel in the front-rear direction as shown in FIG. The insulating sleeve 3 is arranged beside the lead-out portion 11a of the two cable cores 11 in a desired direction, and the inside of the cable storage chamber 31 is passed through the lead-out portion 11a of the two cable cores 11 through the elongated gap 34 of the insulating sleeve 3. And the insulating sleeve 3 is attached around the two cable cores 11. Therefore, the insulating sleeve 3 does not need to be inserted into the drawer 11a before the crimping step of crimping the conductive terminal 23 to the core wire 12, so that the insulating sleeve 3 does not hinder the crimping operation, and the slit 14a The conductive terminals 23 can be easily crimped to the respective core wires 12 whose distances between them are widened.

  In the insulating sleeve 3 in which the lead portion 11a of the two cable cores 11 is accommodated in the cable accommodating chamber 31, the tapered surface 32a is inserted from the front along the inner surface of the outer cover 14 of the connection cable 10, and the ring stopper portion 33 is engaged. When inserted until it comes into contact with the front end of the outer cover 14, the sleeve body 32 of the insulating sleeve 3 is inserted between the outer cover 14 and the two cable cores 11. When the insulating sleeve 3 is inserted between the outer cover 14 and the two cable cores 11, the outer cover 14 in which the slit 14a is formed expands in diameter, and the insulating sleeve 3 can be inserted with a low insertion force.

  Subsequently, the two cable cores 11 and the conductive terminal 23 are arranged at positions on the lower insulator 21b where the conductive terminal 23 fixed to the core wire 12 is accommodated in the terminal accommodating hole 22, and the upper insulator is placed from above. 21a is placed, and the lead-out portion 11a of the two cable cores 11 of the terminal of the connection cable 10 and the conductive terminal 23 fixed to the core wire 12 are positioned and attached therebetween.

  The lower insulator 21b and the upper insulator 21a each having the two cable cores 11 and the conductive terminal 23 attached to the inside thereof have a rectangular parallelepiped shape having a longitudinal direction in the front-rear direction in a state in which the lower insulator 21b and the upper insulator 21a are vertically stacked. Along the entirety, the shield case 24 made of a conductive metal plate is bent into a rectangular tube shape, and the lower insulator 21b and the upper insulator 21a are integrated. In a state where the outer surfaces of the lower insulator 21b and the upper insulator 21a are surrounded by the shield case 24, the crimping fitting 2 composed of a plate piece integrally connected to the rear of the shield case 24 has an insulating sleeve 3 and an outer cover 14 and two cables. As shown in FIG. 6, the crimping fitting 2 made of a plate piece is crimped along the periphery of the outer cover 14 so as to The crimp fitting 2 is crimped to the outer skin 14 sandwiched between them.

  When the crimping fitting 2 is crimped to the outer cover 14, the connector module 20a shown in FIG. 6, in which the upper insulator 21a and the lower insulator 21b are integrated with the shield case 24, is fixed to the end of the insulated cable 10, and this connector module 20a is The connector module 20a is fixed to the external housing 21c by inserting the engaging protrusion 27 formed on the external housing 21c into the engaging concave portion of the connector module 20a. The assembly of the connection structure 1 is completed.

  According to the connection structure 1 of the cable end, as shown in FIG. 3, the outer skin 14 is high by caulking the crimping fitting 2 along the outer skin 14 in which the hard insulating sleeve 3 is disposed. The connection cable 10 is compressed by the compressive force, and the outer skin 14 of the connection cable 10 is firmly connected to the crimp fitting 2 fixed to the insulating housing 21 of the connector 20 via the shield case 24, so that the connection cable 10 has a high tensile strength with respect to the connector 20. Is obtained.

  When the crimping fitting 2 is crimped along the outer skin 14, the cylindrical insulating sleeve 3 having the elongated gap 34 formed in the front-rear direction also contracts inward, and the two cables accommodated in the cable accommodation chamber 31. Since the two cable cores 11 are crimped to the connector 20, the two cable cores 11 are also fixed to the connector 20 via the insulating sleeve 3, the outer cover 14 and the crimping fitting 2, and an external force in the unexpected withdrawal direction (rearward) is applied to the connection cable 10. Even if it is applied, the external force is not transmitted to the electrical connection between the core wire 12 of the cable core 11 and the conductive terminal 23, and the electrical connection is not damaged or the connection failure does not occur.

  Further, since the insulating sleeve 3 is formed of an insulating synthetic resin having a lower dielectric constant than a conventional conductive metal sleeve, the capacitance around the core wire 12 at the position where the insulating sleeve 3 is disposed does not increase, and the shielding is not performed. Since the characteristic impedance is not significantly different from the characteristic impedance of the connection cable 10 having no structure, signal loss due to impedance mismatching can be suppressed.

  Further, even if the space between the lead portions 11 a is widened for the step of electrically connecting to the conductive terminal 23, the two cable cores 11 are thereafter moved in the horizontal direction in the cable housing chamber 31 of the insulating sleeve 3. Since the wires are wired in parallel at equal intervals, the characteristic impedance does not vary.

  In the first embodiment, the insulating sleeve 3 is attached around the cable core 11 after the electrical connection process between the core wire 12 and the conductive terminal 23, but the cable core 11 is attached to the insulating sleeve 3 before the electrical connection process. It may be inserted.

  Next, a cable terminal connection structure 6 according to a second embodiment of the present invention will be described with reference to FIGS. In the description of the second embodiment, components having the same or similar functions as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 10, the connection structure 6 of the cable terminal has an insulation sleeve 7 arranged around an outer cover 14 of the connection cable 10, and the crimping fitting 2 is crimped to the insulation sleeve 7 to connect the connection cable 10 to the connector 20. Fixed to.

  The insulating sleeve 7 is made of hard PBT (Polybutylene terephtalate) having a higher modulus of longitudinal elasticity than the outer cover 14 of polyvinyl chloride as a molding material, as shown in FIG. 10 is formed in a cylindrical shape having an inner diameter slightly larger than the outer diameter of the outer skin 14, and an elongated gap 7a is formed on the side of the cylindrical insulating sleeve 7 from the front end to the rear end as shown in FIG. By doing so, it can be expanded and contracted in the radial direction. On the inner wall surface of the cylindrical insulating sleeve 7, a wedge portion 8 which is wedge-fitted to the outer cover 14 of the connection cable 10 and prevents the outer cover 14 from coming off backward is formed in a ring shape around the central axis. .

  Also in the cable terminal connection structure 6 according to the second embodiment, in the assembling step of fixing the terminal of the connection cable 10 to the connector 20, the core wires 12 first exposed at the ends of the respective cable cores 11 are respectively attached to the core wires 12. The crimp barrel 23a of the conductive terminal 23 is crimped to fix the core wire 12 and the conductive terminal 23 and electrically connect them.

  Before the electric connection step, the insulating sleeve 7 is inserted around the outer skin 14 and arranged around the outer skin 14, but is slid to a position away from the front end of the outer skin 14 as shown in FIG. As a result, the electrical connection between the core wire 12 and the conductive terminal 23 is not obstructed.

  If the outer cover 14 can be inserted into the cylindrical insulating sleeve 7 through the elongated gap 7a formed in the front-rear direction of the insulating sleeve 7, the connection cable 10 can be inserted after the electrical connection step or the assembly step of the connector module 20a. The connecting sleeve 7 can also be arranged around the outer skin 14 of the connecting sleeve 7.

  Subsequently, the shield case 24 is bent along the entire periphery of the lower insulator 21b and the upper insulator 21a to which the two cable cores 11 and the conductive terminals 23 are attached, thereby forming an integrated connector module 20a. The sleeve 7 is crimped around the insulating sleeve 7 slid to the front end of the outer skin 14 by crimping the metal fitting 2 made of a plate piece integrally connected to the rear of the shield case 24 along the outer skin 14. The crimping fitting 2 is crimped to the hard insulating sleeve 7 arranged in the above.

  When the crimp fitting 2 is crimped to the insulating sleeve 7, the connector module 20a shown in FIG. 11 is fixed to the end of the insulated cable 10, and this connector module 20a is inserted into the mounting hole 26 of the external housing 21c from the rear, and the external housing The connector module 20a is fixed to 21c, and the connection structure 6 of the cable terminal is assembled.

  According to the connection structure 6 of the cable terminal, as shown in FIGS. 7 and 8, the crimp fitting 2 is applied along the periphery of the insulating sleeve 7 arranged so as to surround the outer periphery of the outer sheath 14 of the connection cable 10. By tightening, the entire insulating sleeve 7 is reduced in diameter in the radial direction, and compresses the outer peripheral surface of the facing outer skin 14. As a result, a high frictional force in the front-rear direction is generated on the contact surface between the insulating sleeve 7 and the outer cover 14, and the outer cover 14 of the connection cable 10 is firmly fixed to the connector 20 via the connection sleeve 7 and the crimp fitting 2. In particular, since a wedge portion 8 is formed on the inner wall surface of the insulating sleeve 7, which is reduced in diameter by crimping with the crimp fitting 2, the wedge portion 8 is formed to prevent the outer sheath 14 from being pulled backward, so that the connection cable 10 is pulled backward. In the direction, a high tensile strength for the connector 20 is obtained.

  Further, since the insulating sleeve 7 is arranged between the outer cover 14 and the conductive crimping fitting 2, the distance from the core wire 12 to the crimping fitting 2 is widened, and the capacitance around the core wire 12 does not change so much. The characteristic impedance of the connection cable 10 which does not change does not largely change at the crimped portion of the crimping fitting 2, and signal loss due to impedance mismatching can be suppressed.

  In each of the above-described embodiments, the crimping fitting 2 is formed integrally with the shield case 24 fixed to the insulating housing 21 of the connector 20. The method of fixing to the connector 20 can be arbitrarily selected.

  Further, in the above-described embodiment, the conductive terminal 23 is crimped to the core wire 12 of the connection cable 10 and the two are electrically connected. However, the two terminals may be electrically connected by another method. The core wire 12 may be connected by soldering to the legs protruding from the insulating housing of the provided conductive terminal.

  Although the crimping fitting 2 has been described as being crimped from the periphery of the outer sheath 14 of one connection cable 10, a plurality of connection cables 10 may be bundled and crimped from the bundled periphery.

  INDUSTRIAL APPLICATION This invention is suitable for the connection structure of the cable terminal which connects the terminal of the connection cable which does not have a shield structure, such as a braided wire, to a connector.

1 Connection structure of cable terminal (first embodiment)
2 Crimp fitting 3 Insulation sleeve (first embodiment)
6. Connection structure of cable terminal (second embodiment)
7. Insulation sleeve (second embodiment)
7a Elongated gap 8 Wedge portion 10 Connection cable 11 Cable core 11a Pull-out portion 12 Core wire 13 Inner sheath 14 Outer skin 14a Slit 20 Connector 21 Insulated housing 23 Conductive terminal 24 Shield case 34 Elongated gap

Claims (7)

A connection cable in which the periphery of one or more cable cores in which a conductive core wire is covered with an insulating inner sheath is further covered with an insulating sheath;
A connector having a conductive terminal mounted in an insulated housing;
A crimp fitting fixed to the connector,
A cable terminal connection structure for connecting the terminal of the connection cable to the connector by caulking the crimping fitting from around the outer sheath in a state where the core wire is electrically connected to the conductive terminal,
A cylindrical insulating sleeve formed of a synthetic resin material having a higher longitudinal elastic modulus E than the inner sheath is inserted between the inner sheath and the outer skin,
A connection structure for a cable terminal, wherein the crimping fitting is crimped along the periphery of the outer sheath sandwiched between the insulating sleeve and the outer sleeve to be crimped to the outer sheath. The insulating sleeve is formed in a cylindrical shape surrounding a cable accommodating chamber for accommodating one or two or more of the cable cores, and an elongated gap communicating from one end opening of the cylindrical shape to the other end opening is formed. The connection structure for a cable terminal according to claim 2, wherein: The slit according to claim 1, wherein a slit cut out from one end on a terminal side from which one or more cable cores are drawn out is formed in the outer cover. 4. Connection structure for cable terminals. The said crimp fitting is fixed to the said insulating housing, and is integrally formed in the metal shielding case surrounding the outer surface of the said insulating housing, The Claim 1 characterized by the above-mentioned. Connection structure for cable terminals. A connection cable in which the periphery of one or more cable cores in which a conductive core wire is covered with an insulating inner sheath is further covered with an insulating sheath;
A connector having a conductive terminal mounted in an insulated housing;
A crimp fitting fixed to the connector,
A cable terminal connection structure for connecting the terminal of the connection cable to the connector by caulking the crimping fitting from around the outer sheath in a state where the core wire is electrically connected to the conductive terminal,
An insulating sleeve is further formed of a synthetic resin material having a higher longitudinal elastic coefficient E than the outer skin and formed in a cylindrical shape surrounding the outer circumference of the outer skin, and having an elongated gap formed from the one end opening of the cylindrical shape to the other end opening. ,
A connection structure for a cable terminal, wherein the crimping fitting is crimped along the periphery of the insulating sleeve sandwiched between the outer sleeve and the crimping metal to crimp the insulating sleeve. The cable terminal connection structure according to claim 5, wherein a wedge portion is formed on an inner wall surface of the cylindrical insulating sleeve so as to prevent a terminal portion of the outer cover from coming off from the insulating sleeve. The said crimping fitting is being fixed to the said insulating housing, and is integrally formed in the metal shielding case surrounding the outer surface of the said insulating housing, The Claim 7 or Claim 6 characterized by the above-mentioned. Connection structure for cable terminals.

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