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EP3425741B1 - Klemmenanordnung für geschirmtes kabel - Google Patents

Klemmenanordnung für geschirmtes kabel Download PDF

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Publication number
EP3425741B1
EP3425741B1 EP18179215.1A EP18179215A EP3425741B1 EP 3425741 B1 EP3425741 B1 EP 3425741B1 EP 18179215 A EP18179215 A EP 18179215A EP 3425741 B1 EP3425741 B1 EP 3425741B1
Authority
EP
European Patent Office
Prior art keywords
ferrule
terminal assembly
circumferential grooves
circumferential
inner ferrule
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18179215.1A
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English (en)
French (fr)
Other versions
EP3425741A1 (de
Inventor
Nicholas A DURSE
Thomas S HUDA
Eric B POMA
Bruce D. TAYLOR
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aptiv Technologies Ltd
Original Assignee
Aptiv Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US15/985,833 external-priority patent/US10680355B2/en
Application filed by Aptiv Technologies Ltd filed Critical Aptiv Technologies Ltd
Publication of EP3425741A1 publication Critical patent/EP3425741A1/de
Application granted granted Critical
Publication of EP3425741B1 publication Critical patent/EP3425741B1/de
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0518—Connection to outer conductor by crimping or by crimping ferrule

Definitions

  • the invention relates to a terminal assembly for an electrically shielded wire cable, particularly a terminal assembly having a resiliently compressible inner ferrule.
  • Braided shields of shielded cables are currently terminated by placing the braids of the shield between a metal inner and outer ferrule before crimping.
  • An example of a terminal assembly using these ferrules is shown in Figs 1A - ID.
  • the outer insulation of the cable 112 is first removed to expose the braided shield 118 and the braids of the shield are then flared and a metallic tubular inner ferrule 122 is placed between the braids 118 and the inner insulation 114 of the shielded cable 112 (see Fig. 1A ).
  • a metallic tubular outer ferrule 132 is placed over the braided shield 118 and inner ferrule 122 (see Fig. 1B ) and then crimped 136 to secure the outer ferrule 132 to shielded cable 112 (see Figs. 1C and ID).
  • the difference between the inner diameter of the outer ferrule132 and the outer diameter of the inner ferrule 122 is typically about 1 millimeter. Thick inner ferrules can degrade the strength of the crimp possibly reducing pull off force and increasing shield to outer ferrule electrical resistance. Thin inner ferrules can rupture during crimping. Rupture of the inner ferrule 122 could cause undesirable electrical contact and shorting of the inner conductor 114 and the braided shield 118. Therefore, the inner and outer ferrule diameters must be carefully matched and different cable sizes and applications require different sized inner and outer ferrules. The inner and outer ferrules are formed by either deep draw stamping or machining; both of these manufacturing methods are relatively expensive.
  • inner and outer ferrule sizes may differ only slightly for different shielded cables which may make it difficult to visually distinguish between different sized inner or outer ferrules.
  • Applying markings such as color coding, may be used to help identify different ferrules.
  • applying these markings is an additional manufacturing process that undesirably increases ferrule manufacturing time and cost. Therefore, a reliable ferrule assembly that can easily accommodate different cable sizes remains desired.
  • Publication US 6 107 572 A discloses a terminal-processed structure of a shielded cable comprising a hard sleeve-like body inserted beneath the exposed, braided metallic wires of the shielded cable and a conductive sleeve-like body crimped on the exposed, braided metallic wires of the shielded cable.
  • the hard sleeve-like body may be provided with a plurality of circumferential grooves in the outer periphery thereof.
  • Publication US 2015/0303611 A1 discloses a shielded connector comprising a shield shell and an elastic pressing member arranged at the inner circumference side of a cylindrical portion of the shield member across the shield member.
  • the pressing member presses an end portion of the shield member toward the cylindrical portion and fixes the shield member to the cylindrical portion in close contact with each other.
  • Publication US 5 432 301 A discloses a clamp for securely fixing and holding a ground or shielded cable.
  • the clamp comprises a clamping insert made of plastic and having axial slits.
  • Publication GB 2 064 236 A discloses an easily disassembled terminal assembly configured to terminate a shielded cable having an inner conductor, an inner insulator surrounding the inner conductor, an outer conductor surrounding the inner insulator, and an outer insulator surrounding the outer conductor, said terminal assembly comprising:an outer ferrule defining a generally cylindrical shape and formed of a plastic conductive material and an inner ferrule formed of an elastomeric material and defining a generally cylindrical shape, wherein a portion of the outer conductor is disposed intermediate the inner ferrule and the outer ferrule, wherein at least a portion of the inner ferrule is disposed within the outer ferrule, wherein the inner ferrule comprises a plurality of circumferential grooves defined therein, and wherein the inner ferrule further comprises a plurality of circumferential ridges protruding from the inner ferrule.
  • a terminal assembly is configured to terminate a shielded cable having an inner conductor, an inner insulator surrounding the inner conductor, an outer conductor surrounding the inner insulator, and an outer insulator surrounding the outer conductor.
  • the terminal assembly comprises an outer ferrule defining a generally cylindrical shape and formed of a plastic conductive material; and an inner ferrule formed of an elastomeric material and defining a generally cylindrical shape. At least a portion of the inner ferrule is disposed within the outer ferrule. A portion of the outer conductor is disposed intermediate the inner ferrule and the outer ferrule.
  • the outer ferrule is crimped to the inner ferrule, wherein the inner ferrule comprises a plurality of circumferential grooves defined therein.
  • the inner ferrule further comprises a plurality of circumferential ridges protruding from the inner ferrule.
  • a terminal assembly including features configured to terminate a shield of a shielded cable having an inner conductor, an inner insulator surrounding the inner conductor, an outer conductor surrounding the inner insulator, and an outer insulator surrounding the outer conductor.
  • the terminal assembly includes a generally cylindrical outer ferrule that is formed of a plastic conductive material and a generally cylindrical inner ferrule that is formed of an elastic dielectric material.
  • plastic means that the shape of the material is permanently deformed after an applied stress is removed and elastic means that the material is capable of recovering original size and shape after an applied stress is removed.
  • the inner ferrule is placed over an end portion of the shielded cable.
  • a portion of the outer insulator is removed and an exposed portion of the outer conductor is placed over the inner ferrule and the outer ferrule is then placed over the inner ferrule.
  • the outer ferrule is then crimped to retain the terminal assembly to the shielded cable, plastically deforming the outer ferrule and elastically deforming the inner ferrule.
  • the exposed portion of the outer conductor is disposed intermediate the inner and outer ferrules and is in intimate contact therewith.
  • Figs. 2 - 7 illustrate an example of a terminal assembly 10 configured to terminate a shield of a shielded cable 12 and a method of forming such a terminal assembly 10.
  • the shielded cable 12 includes an inner conductor 14 comprising metallic core wires, a first or inner insulator 16 surrounding the inner conductor 14, an outer conductor 18 formed of braided metallic wires which sheathe the inner insulator 16, and a second or outer insulator 20 that covers the outer conductor 18.
  • a sleeve-like body or generally cylindrical inner ferrule 22 having an inner diameter sufficient to receive the shielded cable 12 is slid over an end portion of the shielded cable 12 in a direction shown by arrow 24.
  • the outer surface 26 of the inner ferule 22 has a generally uniform outer diameter. Leading and trailing edges 28, 30 of the inner ferrule 22 may be beveled.
  • the inner ferrule 22 is formed of a resilient compressible dielectric material.
  • the resilient compressible dielectric material is an elastomeric material having a Shore A durometer hardness between 50 and 80, such as silicone-based material.
  • the inner ferrule 22 merely serves to support the outer conductor 18 and does not need to electrically communicate with the outer conductor 18.
  • the inner ferrule 22 may be formed by an injection molding process.
  • the inner ferrule 22 is formed into a complete cylindrical body in the non-claimed embodiment shown in Figs. 2-7 , the inner ferrule may alternatively comprise a pair of half parts divided axially or may be provided with a slit extending axially since the inner ferrule could be brought into a complete cylinder when it is assembled on the shielded cable and may simplify the step of mounting the inner ferrule to the shielded cable.
  • the shielded cable 12 is stripped at one end so that at least a portion of the outer insulator 20 is removed exposing the braided wires of the outer conductor 18. Then, as shown in Fig. 4 , the braided wires of the outer conductor 18 are flared and pulled back over the inner ferrule 22 covering at least a portion of the outer surface 26 of the inner ferrule 22.
  • another sleeve-like body or generally cylindrical outer ferrule 32 having an inner diameter sufficient to receive the inner ferrule 22 and braided wires of the outer conductor 18 coving the inner ferrule 22 is slid over at least a portion of the inner ferrule 22 in the direction shown by arrow 24.
  • the outer ferrule 32 is formed of a conductive metallic material, such as a tin plated copper alloy.
  • the outer ferrule 32 may be formed by a deep draw stamping process or a machining process.
  • At least one open end 34 of the outer ferrule 32 has an opening as large as the inner diameter of the outer ferrule 32.
  • the outer ferrule 32 is crimped, i.e. indentations 36 are formed in the outer ferrule 32, thereby plastically deforming the outer ferrule 32 and elastically deforming the inner ferrule 22 in order to retain the terminal assembly 10 to the shielded cable 12 and putting the outer ferrule 32 and inner ferrule 22 in intimate contact with the outer conductor 18 therebetween.
  • the outer ferrule 32 may then be electrically connected to an electrical ground (not shown) such as a conductive casing.
  • Fig. 8 illustrates an example of a cross section of a crimped terminal assembly 110 having a metallic outer ferrule 132 and a metallic inner ferrule 122 according to the prior art.
  • the outer ferrule 132 and the inner ferrule 122 are both plastically deformed during the crimping process.
  • there are voids 125 between inner ferrule 122 and the outer ferrule 132 that may reduce the pull off force needed to pull the terminal assembly 110 off of the shielded cable and could allow water and other contaminants to enter the terminal assembly 110 causing corrosion that could increase electrical resistance between the outer conductor 118 and the outer ferrule 132 and further reduce pull off force.
  • there are a number of the strands of the braided wires of the outer conductor 118 that are not in contact with the outer ferrule 132 which may further increase electrical resistance between the outer conductor 118 and the outer ferrule 132.
  • Fig. 9 illustrates a cross section of the terminal assembly 10 shown in Figs. 2-7 and described above.
  • the number and size of voids is greatly reduced.
  • the terminal assembly 110 of Fig. 8 has been found to have a pull off force of about 560 newtons while the terminal assembly 10 of Fig. 9 has been found to have a pull off force of about 690 newtons, an improvement in pull off force performance of about 23%.
  • the elastic deformation of the inner ferrule 22 provides the reduction of voids between the inner and outer ferrule 32 and may contribute to improved pull off force performance compared with the prior art terminal assembly 110.
  • testing by the inventors has found that the resistance between the outer conductor 18 and the outer ferrule 32 of the terminal assembly 10 is comparable to the terminal assembly 110.
  • the terminal assembly 10 has a reduced likelihood of short circuit between the outer ferrule 32 or outer conductor 18 and the inner conductor 14 since the inner ferrule 22 is also an insulating body rather than a conductive body as seen in other prior art terminal assemblies, e.g. Fig. 8 .
  • an outer ferrule 32 having one specific inner diameter may be used with multiple shielded cable 12 diameters by merely varying the inner and outer diameter of the resilient inner ferrule 22, since it is no longer necessary to maintain a difference between the inner diameter of the outer ferrule 32 and the outer diameter of a metallic inner ferrule 22 of about 1 millimeter to avoid issues of thick inner ferrules can degrade the strength of the crimp and thin inner ferrules can rupture during crimping described in the BACKGROUND OF THE INVENTION section above. This will reduce the number of different outer ferrule designs and part numbers required to accommodate different cable sizes.
  • the inner ferrule 22 can easily be color coded to identify different inner ferrule 22 sizes by adding a colorant to the elastomeric material prior to molding the inner ferrule 22.
  • Fig. 10 illustrates a non-claimed example of an inner ferrule 222 that includes a plurality of grooves 238 in the outer surface 226 of the inner ferrule 222 extending circumferentially around the inner ferrule 222.
  • the inventors have discovered that the definition of the grooves 238 in the outer surface 226 of the inner ferrule 222 improves retention of the outer ferrule 32 to the inner ferrule 222 and thereby increasing the pull off force that the terminal assembly 10 can withstand before separating from the shielded cable 12.
  • Fig. 11 illustrates a non-limiting example of an inner ferrule 322 that includes a plurality of ridges 340 protruding from the outer surface 326 of the inner ferrule 322 extending circumferentially around the inner ferrule 322 in addition to a plurality of grooves 338 similar to those shown in shown in Fig. 11 .
  • the ridges 340 are arranged so that at least one of the ridges 340 are intermediate two adjoining grooves 338. As shown in Fig. 11 , each ridge 340 is adjacent each groove 338.
  • the inventors have discovered that the addition of ridges 340 to the grooves 338 in the outer surface 326 of the inner ferrule 322 may further improve retention of the outer ferrule 32 to the inner ferrule 322 and thereby increasing the pull off force that the terminal assembly 10 can withstand before separating from the shielded cable 12.
  • Figs. 12 through 18B illustrated other non-limiting alternative examples of inner ferrules 422, 522, 622, 722, 822, 922, 1022 having a plurality of circumferential grooves 438, 538, 638, 738, 838, 938, 1038 and ridges 440, 540, 640, 740, 840, 940, 1040.
  • the profile shapes of the grooves and ridges may vary and may provide benefits of improved pull off force or reduced electrical resistance between the outer ferrule and the outer conductor.
  • Figs. 19A and 19B illustrate a non-claimed alternative example of an inner ferrule 1122 having a plurality of circumferential grooves 1138 and a series of projections 1142 circumferentially arranged on the outer surface of the inner ferrule.
  • the projections 1142 are a series of hemispherical bumps. These grooves 1138 and projections 1142 and may also provide benefits of improved pull off force or reduced electrical resistance between the outer ferrule and the outer conductor.
  • a terminal assembly 10 having an inner ferrule 22 formed of a resilient compressible dielectric material is provided.
  • the terminal assembly 10 provides a cost advantage over prior art terminal assemblies 110 by replacing deep drawn or machined inner ferrules with a molded inner ferrule that can be produced inexpensively.
  • One size inner ferrule may be molded to match required cable size which eliminates the need for multiple sizes of inner ferrules.
  • the terminal assembly 10 may also allow some applications to use one outer ferrule size for multiple cable sizes.
  • the inner ferrule 22 may be common to multiple applications.
  • the inner ferrule 22 may be colored to provide visual differentiation between various sizes.
  • the inner ferrule 22 provides increased insulation protection for the inner conductor and decreases the risk of piercing through the insulation of the core conductor.
  • the inner ferrules 122-822 incorporate grooves or grooves and projections that improve the retention of the outer ferrule to the outer conductor and inner ferrule in order to meet or exceed the pull off force compared to the prior art terminal
  • 'one or more' includes a function being performed by one element, a function being performed by more than one element, e.g., in a distributed fashion, several functions being performed by one element, several functions being performed by several elements, or any combination of the above.
  • first, second, etc. are, in some instances, used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.
  • a first contact could be termed a second contact, and, similarly, a second contact could be termed a first contact, without departing from the scope of the various described embodiments.
  • the first contact and the second contact are both contacts, but they are not the same contact.
  • the term “if' is, optionally, construed to mean “when” or “upon” or “in response to determining” or “in response to detecting,” depending on the context.
  • the phrase “if it is determined” or “if [a stated condition or event] is detected” is, optionally, construed to mean “upon determining” or “in response to determining” or “upon detecting [the stated condition or event]” or “in response to detecting [the stated condition or event],” depending on the context.

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  • Coupling Device And Connection With Printed Circuit (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Claims (11)

  1. Klemmenanordnung (10), die dazu konfiguriert ist, ein geschirmtes Kabel (12) mit einem Innenleiter (14), einem Innenisolator (16), der den Innenleiter (14) umgibt, einem Außenleiter (18), der den Innenisolator (16) umgibt, und einem Außenisolator (20), der den Außenleiter (18) umgibt, abzuschließen, wobei die Klemmenanordnung (10) Folgendes umfasst:
    eine Außenhülse (32), die eine im Wesentlichen zylindrische Form definiert und aus einem leitfähigen Kunststoffmaterial gebildet ist; und
    eine Innenhülse (322), die aus einem Elastomermaterial gebildet ist und eine im Wesentlichen zylindrische Form definiert, wobei ein Abschnitt des Außenleiters (18) zwischen der Innenhülse (322) und der Außenhülse (32) angeordnet ist, wobei mindestens ein Abschnitt der Innenhülse (322) innerhalb der Außenhülse (32) angeordnet ist, wobei die Innenhülse (322) eine Vielzahl von darin definierten Umfangsnuten (338) umfasst und wobei die Innenhülse (322) ferner eine Vielzahl von Umfangsrippen (340) umfasst, die von der Innenhülse (322) vorsteht,
    dadurch gekennzeichnet, dass die Außenhülse (32) an die Innenhülse (322) gecrimpt ist.
  2. Klemmenanordnung (10) nach Anspruch 1, wobei eine Umfangsrippe (340) der Vielzahl von Umfangsrippen (340) zwischen zwei Umfangsnuten (338) der Vielzahl von Umfangsnuten (338) angeordnet ist.
  3. Klemmenanordnung (10) nach Anspruch 2, wobei die eine Umfangsrippe (340) an eine der zwei Umfangsnuten (338) der Vielzahl von Umfangsnuten (338) angrenzt und von der anderen der zwei Umfangsnuten (338) der Vielzahl von Umfangsnuten (338) beabstandet ist.
  4. Klemmenanordnung (10) nach Anspruch 2, wobei die eine Umfangsrippe (840) an die zwei Umfangsnuten (838) der Vielzahl von Umfangsnuten (838) angrenzt.
  5. Klemmenanordnung (10) nach einem der Ansprüche 1-4, wobei die Vielzahl von Umfangsrippen (840) eine konvexe abgerundete Fläche definiert und wobei ein Boden der Vielzahl von Umfangsnuten (838) eine konkave abgerundete Fläche definiert.
  6. Klemmenanordnung (10) nach einem vorhergehenden Anspruch, wobei ein Boden der Vielzahl von Umfangsnuten (538) im Allgemeinen orthogonal zu Seitenwänden der Vielzahl von Umfangsnuten (538) ist.
  7. Klemmenanordnung (10) nach einem der Ansprüche 1-5, wobei ein Boden der Vielzahl von Umfangsnuten (938) einen stumpfen Winkel relativ zu einer ersten Seitenwand der Vielzahl von Umfangsnuten (938) bildet.
  8. Klemmenanordnung (10) nach Anspruch 7, wobei ein Boden der Vielzahl von Umfangsnuten (638) einen spitzen Winkel relativ zu einer zweiten Seitenwand der Vielzahl von Umfangsnuten (638) bildet.
  9. Klemmenanordnung (10) nach Anspruch 7, wobei ein Boden der Vielzahl von Umfangsnuten (1038) im Wesentlichen orthogonal zu einer zweiten Seitenwand der Vielzahl von Umfangsnuten (1038) ist.
  10. Klemmenanordnung (10) nach einem der vorhergehenden Ansprüche, wobei das Elastomermaterial ein Material auf Silikonbasis ist.
  11. Klemmenanordnung (10) nach einem der vorhergehenden Ansprüche, wobei das Elastomermaterial eine Shore-A-Durometer-Härte zwischen 50 und 80 aufweist.
EP18179215.1A 2017-07-05 2018-06-22 Klemmenanordnung für geschirmtes kabel Active EP3425741B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762528651P 2017-07-05 2017-07-05
US15/985,833 US10680355B2 (en) 2016-01-27 2018-05-22 Terminal assembly for shielded cable

Publications (2)

Publication Number Publication Date
EP3425741A1 EP3425741A1 (de) 2019-01-09
EP3425741B1 true EP3425741B1 (de) 2022-08-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18179215.1A Active EP3425741B1 (de) 2017-07-05 2018-06-22 Klemmenanordnung für geschirmtes kabel

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EP (1) EP3425741B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4191805A1 (de) * 2021-12-02 2023-06-07 Nexans Hochspannungsleistungsverteiler

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1386812A (fr) * 1963-03-21 1965-01-22 Amp Inc Connecteur coaxial étanche
GB2064236A (en) * 1979-10-25 1981-06-10 Bendix Corp Electrical connector for a coaxial cable

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4238517A1 (de) * 1992-11-14 1994-05-19 Hummel Anton Verwaltung Kabelverschraubung für Erdungs- oder Abschirm-Kabel
US6107572A (en) * 1994-07-29 2000-08-22 Sumitomo Wiring Systems, Ltd. Terminal-processed structure of shielded cable and terminal-processing method of the same
JP2014099339A (ja) * 2012-11-15 2014-05-29 Yazaki Corp シールドコネクタ
EP3179563A1 (de) * 2015-12-09 2017-06-14 Teleste Oyj Koaxialkabelstecker

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1386812A (fr) * 1963-03-21 1965-01-22 Amp Inc Connecteur coaxial étanche
GB2064236A (en) * 1979-10-25 1981-06-10 Bendix Corp Electrical connector for a coaxial cable

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