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
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
  • H01R13/5804—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part
  • H01R13/5812—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part the cable clamping being achieved by mounting the separate part on the housing of the coupling device
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
  • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
  • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
  • H01R13/6592—Specific features or arrangements of connection of shield to conductive members the conductive member being a shielded cable
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
  • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
  • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/02—Contact members
  • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials

Definitions

• the invention relates to a band clamp for fastening the shielding of a cable to a tube, for example when fastening current-carrying cables or cable harnesses by means of connectors to batteries, motors, generators, body parts, for example in electric vehicles.
• the invention further relates to a method for producing such a band clamp.
• Such cables often have several individually or jointly shielded cables, with the cable shielding being attached to the tube (sleeve) of a connector by means of a band clamp.
• the cables used have wires with a conductor, often made of aluminum, and with insulation and, on top of the insulation, a shield made of a braid, also made of aluminum.
• the plug has a housing with a tube made of aluminum.
• the cables are inserted through the tube into the plug housing, while the braid serving as shielding is placed outside over the tube.
• the band clamp encloses the shielding in a ring shape and presses it onto the outer peripheral surface of the tube.
• band clamps made of CrNi steel are used for this purpose, there is a risk of contact corrosion between the clamp and the aluminum shielding and, if applicable, the aluminum tube or cable conductor.
• the band clamp must be WO 2018/168831 A1 coated with an insulator. Zinc flakes embedded in the insulator are also intended to act as a sacrificial electrode.
• Typical band clamps as well as those in WO 2018/168831 A1 are essentially ring-shaped with an ⁇ -shaped protuberance, also referred to as an ear, which serves as a clamping device.
• the ear is narrowed with a tool, thus reducing the diameter of the ring formed by the clamp and pulling the clamp together over the shield.
• the degree of plastic deformation of the clamp is very high.
• the invention is therefore based on the object of avoiding the aforementioned corrosion between the shielding of the current-carrying cable and the band clamp.
• the invention relates to a band clamp constructed as described above, but provides a particularly robust and durable coating of the band clamp, which does not lose its corrosion-inhibiting effect even during assembly and operation.
• band clamps of embodiments of the invention are made from a steel band, for example from CrNi steel, which is coated as described below.
• the steel band is closed into a ring and surrounds the item to be fastened, here a shield on a tube.
• the shield is made as a braid from a material with good electrical conductivity, such as copper or aluminum.
• the tube is a sleeve as part of a housing of a connector or plug or another sleeve into which the wires of the cable shielded in this way enter.
• the cross-section of the tube can be oval or circular.
• the band clamp has a clamping device such as the ear described above.
• the band clamp is provided with an insulating coating made of a polymer.
• Parylene in particular Parylene HT, has proven to be particularly suitable as a polymer material, which is preferably vapor-deposited from the gas phase onto the degreased band clamp in a vacuum chamber.
• the polymer coating can withstand high operating temperatures and allows strong plastic deformations, even on the ear-shaped clamping device, without detaching from the band clamp.
• the polymer coating is applied to the finished band clamp in the last step of the clamp manufacturing process. It should have a thickness of no more than 20 ⁇ m, for example around 10 ⁇ m. At this thickness, The risk of impairing the clamp function, especially its elasticity, is low. The polymer coating follows the deformation of the clamp without crumbling.
• a Zn layer with a passivating Zn oxide layer on its surface is applied to the surface of the band clamp, and on top of this a top coat made of a polymer layer, in particular a synthetic resin layer, is applied.
• the entire surface of the band clamp is preferably coated in this way.
• the passivated Zn layer contributes to corrosion protection and has a certain roughness on its surface, to which the top coat adheres particularly well.
• the resin layer preferably consists of TD Excel 300, which is stabilized with aluminum powder.
• Aluminum powder in the top coat helps prevent contact corrosion compared to the aluminum shield. It also makes the coating resistant to damage when the band clamp is tightened.
• the band clamp is first degreased, provided with the Zn layer over its entire surface by thermal diffusion (Zn thermal diffusion or sherardization), then washed, subsequently passivated with a Zn oxide layer and finally sealed with a top polymer or synthetic resin layer.
• the Zn layer can be applied by Zn lamellar coating instead of thermal diffusion, thus forming a Zn lamellar coating.
• the zinc layer is applied as a continuous layer over the entire surface of the band clamp.
• the polymer or synthetic resin layer mentioned above is suitable as a top coat, but an inorganic system is also suitable.
• the aforementioned parylene can also be used as a polymer. Additional layers can be provided over the top coat if necessary, for example to give the coating a desired appearance.
• the powder is mixed into the top coat.
• the powder particles can also be in the form of flakes.
• the powder in the top coat has a higher hardness than its main components (polymer or synthetic resin).
• the top coat can therefore also be coated with Ceramic powder or flakes may be added, if necessary in addition to the other powders mentioned. This increases its abrasion resistance and thus the resistance of the coating to the clamping tool and to friction in the event of displacements over the shield, as can occur during clamping and in operation due to vibrations and temperature changes.
• silicates are particularly advantageous.
• a thin silicate layer of, for example, up to 3 ⁇ m thick can also be applied between the Zn layer and the top coat (optionally mixed with powder, particularly aluminum powder).
• powders or flakes made of essentially the same material as the shield can be used in the topcoat, for example aluminum powder for an aluminum shield or copper powder for a copper shield. This means that no contact corrosion occurs between the topcoat and the shield and the surfaces remain corrosion-free and of good optical quality. Any contact corrosion between the other components is suppressed by the Zn layer under the topcoat.

Landscapes

• Clamps And Clips (AREA)
• Insulated Conductors (AREA)
• Cable Accessories (AREA)
• Manufacturing Of Electric Cables (AREA)
• Other Surface Treatments For Metallic Materials (AREA)
• Details Of Connecting Devices For Male And Female Coupling (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=66752099

Family Applications (1)

Country Status (9)

Family Cites Families (12)

• 2019
  • 2019-05-31 WO PCT/EP2019/064194 patent/WO2020239236A1/de active Application Filing
• 2020
  • 2020-05-31 KR KR1020217042840A patent/KR102644083B1/ko active IP Right Grant
  • 2020-05-31 MX MX2021014608A patent/MX2021014608A/es unknown
  • 2020-05-31 CA CA3138619A patent/CA3138619A1/en active Pending
  • 2020-05-31 CN CN202080044372.8A patent/CN113994543A/zh active Pending
  • 2020-05-31 JP JP2021570256A patent/JP7344989B2/ja active Active
  • 2020-05-31 WO PCT/EP2020/065103 patent/WO2020240035A1/de unknown
  • 2020-05-31 BR BR112021023471A patent/BR112021023471A2/pt unknown
  • 2020-05-31 EP EP20728772.3A patent/EP3977567B1/de active Active
  • 2020-05-31 US US17/612,459 patent/US11949187B2/en active Active

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