EP2338211B1 - Ensemble bague collectrice - Google Patents

Ensemble bague collectrice Download PDF

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Publication number
EP2338211B1
EP2338211B1 EP09778446A EP09778446A EP2338211B1 EP 2338211 B1 EP2338211 B1 EP 2338211B1 EP 09778446 A EP09778446 A EP 09778446A EP 09778446 A EP09778446 A EP 09778446A EP 2338211 B1 EP2338211 B1 EP 2338211B1
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EP
European Patent Office
Prior art keywords
slip ring
cable
ring unit
brush element
unit according
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
EP09778446A
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German (de)
English (en)
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EP2338211A1 (fr
Inventor
Ludwig Angerpointner
Norbert Friese
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.)
LTN Servotechnik GmbH
MD Elektronik GmbH
Original Assignee
LTN Servotechnik GmbH
MD Elektronik GmbH
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Application filed by LTN Servotechnik GmbH, MD Elektronik GmbH filed Critical LTN Servotechnik GmbH
Publication of EP2338211A1 publication Critical patent/EP2338211A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/64—Devices for uninterrupted current collection
    • 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

Definitions

  • the invention relates to a slip ring unit for the electrical connection of two relatively rotatable components, according to claim 1.
  • Slip ring assemblies often include a slip ring brush and abrasive grinders, particularly slip rings, with the slip ring brush in sliding contact with rotating slip rings during operation.
  • slip ring units are used in many technical fields to electrical voltages, in particular signals or electrical power z. B. to transfer from a stationary to a rotating electrical unit. It is important that, for example by resilient brush elements, a good and lasting contact between the slip ring brush and the slip rings is given.
  • document DE-A-10 306 330 discloses a slip ring unit according to the preamble of claim 1.
  • the invention has for its object to provide a compact slip ring unit for reliable and secure transmission of electrical voltages, in particular of analog currents and digital signals, which can be produced with little effort.
  • the slip ring unit is configured so that it is suitable for the electrical connection of two relatively rotatable components.
  • One of the components is configured as a first cable having a core and a screen.
  • the slip ring assembly includes a first brush member which is in electrical contact with a first abrasive member.
  • the slip ring unit comprises a second brush element, which is in electrical contact with a second abrasive body, for transmitting a voltage applied to the core.
  • the slip ring unit comprises a third brush element, which is in electrical contact with a third abrasive body for transmitting a voltage applied to the screen or an applied electrical potential.
  • the first abrasive body has an axially continuous recess through which the first cable is guided for transmitting the voltage applied to the soul.
  • the second brush element is arranged with radial offset to the third brush element.
  • a contact pressure force can be generated by the relevant brush element on the respective grinding body on the brush elements, which has a radial direction component.
  • the second brush element can also be arranged in the axial direction to overlap with the third brush element. That is, both the second brush member and the third brush member are arranged in one (one and the same) cross section of the slip ring unit.
  • the cross section of the slip ring unit is a section through the slip ring unit, which is aligned orthogonal to the axis of rotation.
  • a transmission of electrical voltages is in principle also accompanied by a transmission of electrical currents, unless there is an infinitely high electrical resistance.
  • a transfer of voltage generally also means a transfer of current.
  • electrical signals are physically based also on electrical voltages, so that the transmission of voltages can also mean a transmission of signals. Since electrical voltages are often also referred to as electrical potentials, shielding potentials can also be transmitted by the slip ring unit.
  • the first brush element which is in electrical contact with a first grinding body, may be designed, for example, to transmit analog currents for supplying power to an electrical device.
  • the second brush element which is in electrical contact with the second abrasive body, can be used to transmit a signal applied to the soul, in particular a digital high-frequency signal.
  • the construction according to the invention provides a particularly advantageous arrangement, so that with a compact slip ring unit which is simple in terms of manufacture, a wide variety of types of electrical voltages, in particular currents and digital signals, can be rotatably transmitted, effective shielding being ensured for the transmission of the signals. Accordingly, the shield potential is transmitted to relatively rotatable shield lines.
  • the slip ring unit comprises a plurality of first brush elements and a plurality of first grinding bodies for transmitting electrical voltages, in particular analog currents, wherein the first brush elements and the first grinding bodies are each arranged with axial offset from one another.
  • the first abrasive body has an axially continuous central bore for receiving the first cable.
  • the abrasive body can be designed annular and thus be referred to as a slip ring.
  • the second brush element can be arranged axially offset from the first brush element.
  • the first cable is rotatably arranged relative to the first brush element. Accordingly, then the first cable can be arranged non-rotatably relative to the first grinding body in the slip ring unit. For example, during operation of the slip ring unit, the first cable may rotate with the first abrasive wheel.
  • electrical voltages are transferable from the first cable to a second cable by the slip ring unit, wherein the second cable has a core and a screen, wherein the shield of the second cable is electrically connected to a sleeve and the shield of the first cable electrically is connected to the third grinding body, and the sleeve and the third grinding body are arranged overlapping in the axial and in particular also in the radial direction.
  • the first cable and the second cable may be configured as coaxial cables.
  • the voltages to be transmitted in particular digital signals, have a comparatively high frequency, not infrequently greater than 250 MHz, or greater than 1 GHz. Therefore, it is important that the slip ring unit with respect to the transmission of digital signals does not emit electromagnetic interference pulses but is also particularly protected against influences of external electromagnetic fields. In particular, a high level of safety in this regard is required in medical technology applications.
  • the slip ring unit electrical voltages, in particular analog currents, transferable from a third cable to a fourth cable, wherein the third cable can be guided by the axially continuous recess of the first abrasive body.
  • the slip ring unit is configured so that electrical voltages, in particular analog currents, from a third cable to a fourth cable can be transmitted by the slip ring unit and electrical voltages, in particular digital signals, from the first cable to a second cable are transferable, wherein the fourth cable is guided within a housing of the slip ring unit offset radially outward of the second cable.
  • either the second brush element or the third brush element or both brush elements are configured as a hollow body.
  • one of the brush elements or both brush elements can be configured such that the relevant brush element or the brush elements have radially resilient properties.
  • the second brush element or the third brush element or both may have radially resilient tongues.
  • the second brush element or the third brush element or both brush elements can also be designed as flat spiral springs with cycloid-like geometry, to allow a comparatively soft sliding contact.
  • the core of the first cable is electrically connected to the electrically conductive second abrasive body and a potting compound is provided which surrounds the second abrasive body and the core for receiving at least a portion of the torque required for the operation of the slip ring assembly.
  • the slip ring unit for receiving at least a portion of the torque required for the operation of the slip ring unit can be designed such that electrical voltages, in particular digital signals, can be transmitted from the first cable to a second cable and the second cable has a core and a screen, wherein the core of the second cable is electrically connected to an electrically conductive element.
  • a potting compound is provided, which surrounds the element and the soul. The element can serve as a holder for the second brush element, so that during operation of the slip ring unit, a torque resulting from tangential frictional forces is introduced via the element into the slip ring unit.
  • Potting compound for example, an initially flowable and then curable material, including an adhesive understood.
  • the potting compound is surrounded by a sleeve.
  • an improvement of the torque transmission can be achieved if a) the grinding body or b) the said element has at least one recess for non-positive connection of the casting compound with the grinding body or the element.
  • slip ring unit is used to transmit electrical voltages, in particular of analog currents and digital signals, so that, for example, a rotatable electronic Camera can be connected to a stationary unit.
  • analog currents come about currents to move servomotors, z. B. a zoom drive, into consideration and streams for the operation of the camera electronics.
  • the camera delivers high-frequency digital signals for image transmission, which can also be transmitted without interference by the slip ring unit.
  • the slip ring unit comprises a stator 1 and a rotor 2.
  • the rotor 2 is rotatably arranged relative to the stator 1 by means of bearings 3.
  • the first cable 21 serves to transmit the digital signals having a frequency in the GHz range. It has a central electrically conductive core 21.1, which is surrounded by a dielectric layer 21.2.
  • the dielectric layer 21.2 is in turn surrounded by a screen 21.3, the screen 21.3 comprises in the presented embodiment, a metal mesh.
  • the first cable 21 has an outer insulation 21.4.
  • the screen 21.3 of the first cable 21 is according to the FIG. 1 with a sleeve 2.3, which serves as a (third) abrasive body, electrically connected, z. B. by a crimp connection. Furthermore, the core 21.1 of the first cable 21, here with a solder connection, electrically contacted with a pin 2.2 and mechanically fixed against rotation.
  • the pin 2.2 has a central axial blind hole, in which the soul 21.1 is introduced. As will be explained below, pin 2.2 in the slip ring assembly acts as a (second) abrasive article.
  • a radially oriented bore 2.31 is incorporated into the sleeve 2.3 so that accessibility to the intended solder joint is ensured.
  • a potting compound is introduced through the bore 2.31 after soldering, which helps to absorb the resulting during operation of the slip ring unit torque.
  • a radial recess is additionally provided at pin 2.2. which is not shown in the figures, but in principle as the groove 1.41 described below is configured.
  • the potting compound 2.6 is surrounded by the sleeve 2.3, so that the radial distance between the sleeve 2.3 and the pin 2.2, or between the sleeve 2.3 and the soul 21.1 is filled in an axial section with potting compound 2.6.
  • the sleeve 2.3 is surrounded by a component 2.5 of the rotor 2, which is supported on one of the bearings 3.
  • the first cable 21 is surrounded radially by a third cable 22, which consists of several isolated individual strands.
  • the individual strands of the third cable 22 are each guided radially outwardly through a slot in an electrically insulating support sleeve 2.4 of the rotor 2 to a respective first abrasive body, here in each case a slip ring 2.1.
  • the individual strands of the third cable 22 are each contacted.
  • the slip rings 2.1 are axially aligned with the axial offset Y on the insulating support sleeve 2.4, wherein optionally between adjacent slip rings 2.1 an electrically non-conductive insulating ring is arranged. In the embodiment shown, all slip rings 2.1 are arranged coaxially.
  • Each slip ring 2.1 has a circumferential groove, which has a V-shaped geometry (see also the FIG. 3 ).
  • a second cable 11 is arranged coaxially in the housing 1.10 of the stator 1, next to which a fourth cable 12 extends substantially parallel to the axis.
  • the second cable 11 is used to transmit the digital signals and is also designed as a coaxial cable, so in principle as the first cable 21 constructed so that it has a soul 11.1, a dielectric 11.2, a shield 11.3 and an insulating outer layer 11.4.
  • the screen 11.3 is electrically connected, for example by a crimp connection with a hollow body 2.7.
  • On the hollow body 2.7 is in axial extension a attached further sleeve, which is referred to below as a holder sleeve 1.7.
  • the soul 11.1 of the second cable 11 is electrically and mechanically non-rotatably connected by a solder joint 1.8 with a sleeve-shaped element 1.4.
  • the sleeve-shaped element 1.4 has a recess in the form of a groove 1.41. Alternatively, a plurality of recesses can be incorporated into the element 1.4.
  • the soldering is done by a radial bore 1.71 in the holder sleeve 1.7. After the soldering process potting compound 1.6 is pressed through the hole 1.71 in the cavity between the holder sleeve 1.7 and the element 1.4 or between the holder sleeve 1.7 and the soul 11.1.
  • the potting 1.6 then hardens and serves to accommodate at least a portion of the torque required for the operation of the slip ring unit.
  • the load capacity of this connection is enhanced by the recess 1.41, through which a non-positive connection of the potting compound 1.6 is made with the sleeve-shaped element 1.4.
  • a frictional connection of the potting compound 1.6 is achieved with the holder sleeve 1.7. Because the volume of the potting compound 1.6 is distributed so that casting compound 1.6 also remains in the bore 1.71, so that it goes there radially beyond the inner diameter of the holder sleeve 1.7 and so there is also a positive connection is generated.
  • the rotor-side connection between the casting compound 2.6 and the sleeve 2.3 is formed analogously to the described connection with the stator-side casting compound 1.6.
  • the fourth cable 12 serves to transmit the analog currents and also has several individual strands.
  • the individual strands are brought into contact with first brush elements 1.1.
  • the first brush elements 1.1 are fastened to a holder which is designed as a printed circuit board and, incidentally, is not shown in the figures.
  • the first brush elements 1.1 are also here as resilient Wire bracket executed, which are arranged with axial offset Y to each other.
  • the second brush element 1.2 which is arranged between the pin 2.2 as the second grinding body and the sleeve-shaped element 1.4, serves a resilient sheet.
  • the second brush element 1.2 is made of a thin (0.1 mm) sheet metal strip, which is bent into an open ring and are incorporated into the recesses or openings by an etching process, so that tongues 1.21 arise. These tongues 1.21 are bent radially inwards to achieve the spring action.
  • Each tongue 1.21 also includes a radially inwardly directed protrusion, formed by a bending process, which serves to make a sliding contact on the surface of the pin 2.2.
  • the second brush element 1.2 can be inserted axially into the element 1.4, wherein an axial securing of the second brush element 1.2 relative to the sleeve-shaped element 1.4 is produced by a recess in the element 1.4.
  • the third brush element 1.3 which also includes resilient tongues 1.31.
  • the third brush element 1.3 is fixed in the holder sleeve 1.7 according to the same principle as the second brush element 1.2 in the sleeve-shaped element 1.4.
  • FIG. 5b dispensed with the representation of the visible through the slots in the brush element 1.3 contours.
  • the pin 2.2 and the sleeve 2.3 can be inserted into the brush elements 1.2 and 1.3 respectively. Thereafter, the stator-side holder sleeve 1.7 and the rotor-side sleeve 2.3 are arranged overlapping in the axial direction, which is particularly important for the shielding of electromagnetic radiation, since the holder sleeve 1.7 and the sleeve 2.3 with the umbrellas 11.3, 21.3 are electrically contacted.
  • the axis of rotation of the rotor 2 is simultaneously the axis of rotation of the slip ring unit, so that the rotor 2 is rotatable about the axis of rotation relative to all the brush elements 1.1, 1.2, 1.3.
  • the new design creates a very compact and reliable slip ring unit.
  • both digital signals between the relatively rotatable first and second cables 21, 11 and analogous currents between the relatively rotatable third and fourth cables 12, 22 can be transmitted.
  • the design is characterized, inter alia, by the fact that the first cable 21 is guided in the cavity formed by the axially juxtaposed slip rings 2.1.
  • the second brush element 1.2 with a radial offset X are arranged to the third brush element 1.3. This design allows a very reliable electrical transmission, which allows despite the respective sliding contacts insensitive to electromagnetic interference operation.
  • the holder sleeve 1.7 and / or the sleeve-shaped element 1.4 can be arranged radially floating in the slip ring unit.
  • the bearings 3 in particular the bearing 3 located further inside in the housing 1.10.
  • a machine element such as a snap ring
  • the second and the third brush element can be designed so that they absorb radial forces in the sense of storage.
  • the operation of the slip ring unit can also be reversed, so that the stator 1 is rotating during operation and the rotor 2 is stationary.

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  • Motor Or Generator Current Collectors (AREA)

Abstract

L'invention concerne un ensemble bague collectrice pour la liaison électrique de deux composants (11, 12; 21, 22) pouvant tourner l'un par rapport à l'autre. Un composant est conçu comme un premier câble (21) qui comprend une âme (21.1) et un blindage (21.3). L'ensemble bague collectrice comprend des premier, deuxième et troisième éléments de balai (1.1, 1.2, 1.3) ainsi que des premier, deuxième et troisième corps de frottement (2.1, 2.2, 2.3). Le premier corps de frottement (2.1) comporte un évidement axialement traversant par lequel un premier câble (21) est guidé pour transmettre la tension appliquée à l'âme (21.1). Le deuxième élément de balai (1.2) est en outre disposé avec un décalage axial (X) par rapport au troisième élément de balai (1.3).

Claims (15)

  1. Unité à anneau glissant pour la liaison électrique de deux composants (11, 12 ; 21, 22) pouvant tourner l'un par rapport à l'autre, un composant étant réalisé sous la forme d'un premier câble (21) qui présente une âme (21.1) et un blindage (21.3) et l'unité à anneau glissant
    - comprenant un premier élément à brosse (1.1) qui est en contact électrique avec un premier corps de frottement (2.1) et
    - comprenant un deuxième élément à brosse (1.2) qui est en contact électrique avec un deuxième corps de frottement (2.2) pour la transmission d'une tension présente sur l'âme (21.1),
    - comprenant un troisième élément à brosse (1.3) qui est en contact électrique avec un troisième corps de frottement (2.3) pour la transmission d'une tension présente sur le blindage (21.3) et le deuxième élément à brosse (1.2) étant disposé avec un décalage radial (X) par rapport au troisième élément à brosse (1.3),
    caractérisée en ce que le premier corps de frottement (2.1) présente un creux traversant dans le sens axial à travers lequel est acheminé le premier câble (21) pour la transmission de la tension présente sur l'âme (21.1).
  2. Unité à anneau glissant selon la revendication 1, l'unité à anneau glissant comprenant plusieurs premiers éléments à brosse (1.1) et plusieurs premiers corps de frottement (2.1) pour la transmission des tensions, lesquels sont respectivement disposés avec un décalage axial (Y) les uns par rapport aux autres.
  3. Unité à anneau glissant selon la revendication 1 ou 2, le premier corps de frottement (2.1) présentant un alésage central traversant dans le sens axial pour accueillir le premier câble (21).
  4. Unité à anneau glissant selon l'une des revendications précédentes, le deuxième corps à brosse (1.2) étant disposé avec un décalage axial par rapport au premier élément à brosse (1.1).
  5. Unité à anneau glissant selon l'une des revendications précédentes, le premier câble (21) pouvant tourner par rapport au premier élément à brosse (1.1).
  6. Unité à anneau glissant selon l'une des revendications précédentes, des tensions électriques pouvant être transmises par l'unité à anneau glissant du premier câble (21) au deuxième câble (11),
    - le deuxième câble (11) présentant une âme (11.1) et un blindage (11.3), le blindage (11.3) étant relié électriquement avec une douille (1.7) et
    - le blindage (21.3) du premier câble (21) étant relié électriquement avec le troisième corps de frottement (2.3) et
    la douille (1.7) et le troisième corps de frottement (2.3) étant disposés de manière à se chevaucher dans le sens axial.
  7. Unité à anneau glissant selon l'une des revendications précédentes, des tensions électriques pouvant être transmises par l'unité à anneau glissant d'un troisième câble (22) à un quatrième câble (12) et le troisième câble (22) étant acheminé à travers le creux traversant dans le sens axial du premier corps de frottement (2.1).
  8. Unité à anneau glissant selon l'une des revendications précédentes, des tensions électriques pouvant être transmises par l'unité à anneau glissant d'un troisième câble (22) à un quatrième câble (12) et des tensions électriques pouvant en outre être transmises du premier câble (21) à un deuxième câble (11), le quatrième câble (12) étant acheminé à l'intérieur d'un boîtier (1.10) de l'unité à anneau glissant avec un décalage radial en-dehors du deuxième câble (11).
  9. Unité à anneau glissant selon l'une des revendications précédentes, le deuxième élément à brosse (1.2) et/ou le troisième élément à brosse (1.3) étant à chaque fois réalisé sous la forme d'un corps creux et étant configuré de telle sorte que l'élément à brosse (1.2 ; 1.3) présente des propriétés d'élasticité radiale.
  10. Unité à anneau glissant selon la revendication 9, le deuxième élément à brosse (1.2) et/ou le troisième élément à brosse (1.3) présentant des languettes (1.21 ; 1.31) à élasticité radiale.
  11. Unité à anneau glissant selon l'une des revendications précédentes, l'âme (21.1) du premier câble (21.1) étant reliée électriquement avec le deuxième corps de frottement (2.2) et une masse de scellement (2.6) étant posée, laquelle entoure le deuxième corps de frottement (2.2) et l'âme (21.1), pour absorber au moins une partie du couple nécessaire pour le fonctionnement de l'unité à anneau glissant.
  12. Unité à anneau glissant selon l'une des revendications précédentes, des tensions électriques pouvant être transmises par l'unité à anneau glissant du premier câble (21) à un deuxième câble (11) et le deuxième câble (11) présentant une âme (11.1) et un blindage (11.3), l'âme (11.1) du deuxième câble (11) étant reliée électriquement avec un élément (1.4), une masse de scellement (1.6) étant posée, laquelle entoure l'élément (1.4) et l'âme (11.1), pour absorber au moins une partie du couple nécessaire pour le fonctionnement de l'unité à anneau glissant.
  13. Unité à anneau glissant selon la revendication 11 ou 12, la masse de scellement (1.6 ; 2.6) étant entourée par une douille (1.7) ou par le troisième corps de frottement (2.3).
  14. Unité à anneau glissant selon la revendication 11 ou 13, le corps de frottement (2.3) présentant un creux pour la liaison par adhérence de la masse de scellement (2.6) avec le corps de frottement (2.3).
  15. Unité à anneau glissant selon la revendication 12, 13 ou 14, l'élément (1.4) présentant un creux (1.41) pour la liaison par adhérence de la masse de scellement (1.6) avec l'élément (1.4).
EP09778446A 2008-10-15 2009-09-10 Ensemble bague collectrice Active EP2338211B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008051671A DE102008051671A1 (de) 2008-10-15 2008-10-15 Schleifringeinheit
PCT/EP2009/006564 WO2010043290A1 (fr) 2008-10-15 2009-09-10 Ensemble bague collectrice

Publications (2)

Publication Number Publication Date
EP2338211A1 EP2338211A1 (fr) 2011-06-29
EP2338211B1 true EP2338211B1 (fr) 2012-05-16

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Application Number Title Priority Date Filing Date
EP09778446A Active EP2338211B1 (fr) 2008-10-15 2009-09-10 Ensemble bague collectrice

Country Status (5)

Country Link
US (1) US8348677B2 (fr)
EP (1) EP2338211B1 (fr)
CN (1) CN102217151B (fr)
DE (2) DE102008051671A1 (fr)
WO (1) WO2010043290A1 (fr)

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US20180241166A9 (en) * 2013-03-13 2018-08-23 Mark S. Olsson Rotating contact assemblies for self-leveling camera heads
CN103762475B (zh) * 2014-01-06 2015-08-19 伍浪 高频滑环装置
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US9228359B2 (en) 2014-05-15 2016-01-05 Dometic Corporation Rotatable awning with illumination
US9695635B2 (en) 2014-05-15 2017-07-04 Dometic Corporation Power track awning assembly
USD805019S1 (en) 2015-05-15 2017-12-12 Dometic Sweden Ab Accessory base
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EP3118946B1 (fr) * 2015-07-15 2017-09-13 LTN Servotechnik GmbH Collecteur rotatif et unité comprenant un collecteur rotatif
DE202015105241U1 (de) * 2015-10-05 2017-01-09 Walter Kraus Gmbh Hochfrequenz-Ethernet-Schleifringübertrager
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US20120129360A1 (en) 2012-05-24
WO2010043290A1 (fr) 2010-04-22
US8348677B2 (en) 2013-01-08
DE102008051671A1 (de) 2010-04-22
DE202009018554U1 (de) 2012-01-30
EP2338211A1 (fr) 2011-06-29
CN102217151B (zh) 2013-11-06
CN102217151A (zh) 2011-10-12

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