EP2884602B1 - Carbon brush - Google Patents

Carbon brush Download PDF

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Publication number
EP2884602B1
EP2884602B1 EP14197186.1A EP14197186A EP2884602B1 EP 2884602 B1 EP2884602 B1 EP 2884602B1 EP 14197186 A EP14197186 A EP 14197186A EP 2884602 B1 EP2884602 B1 EP 2884602B1
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EP
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Prior art keywords
carbon
brush
contact
carbon fiber
contact surface
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EP14197186.1A
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German (de)
French (fr)
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EP2884602A1 (en
Inventor
Gerhard DENNER
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Schunk Wien GmbH
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Schunk Wien GmbH
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Priority to PL14197186T priority Critical patent/PL2884602T3/en
Publication of EP2884602A1 publication Critical patent/EP2884602A1/en
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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
    • H01R39/02—Details for dynamo electric machines
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres

Definitions

  • the invention relates to a carbon brush according to the preamble of claim 1 and a grounding contact according to claim 6.
  • Such carbon brushes are used for example in electric motors or grounding contacts of vehicles, especially rail vehicles.
  • the carbon brush makes contact for transmitting electrical currents between a fixed element and a rotating element, the carbon brush disposed on a brush holder, and a contact surface of the carbon brush with a contact force against a mating contact surface, and the contact surface or mating contact surface about an axis of rotation rotates.
  • the circuit in particular fulfills a grounding function.
  • the contact which is established between the contact surface of the carbon brush and the mating contact surface, however, is exposed to influences, which at least complicate the transmission of a stream.
  • the contact surface or the mating contact surface is wetted by the operational entry of oils and fats. Due to the surface wetting forms at high-frequency currents an adverse skin effect, according to which the current flow through the carbon brush does not occur uniformly over the entire cross-section, but the current flow takes place due to magnetic fields predominantly on the outer edges of the carbon brush. The skin effect consequently leads to a considerable reduction of the usable carbon brush cross section for the flow of electrons.
  • a carbon brush with integrated carbon fiber assembly which extends in the longitudinal direction of the brush body.
  • the known carbon brush has a contact surface of the carbon brush formed on a brush body formed as a carbon molding.
  • the carbon fiber arrangement forms a rectilinearly extending in the wear direction of the brush body secondary conducting device, which is arranged with fiber ends in the contact surface of the brush body.
  • the invention is therefore based on the object to propose a carbon brush, which counteracts the formation of the skin effect.
  • the secondary guiding device has at least one carbon fiber arrangement with carbon fibers, the fiber ends of which are arranged in the contact surface, so that the carbon fibers not only allow a particularly effective current conduction, but moreover the fiber ends rupture a wetting film and allow direct contact with the mating contact surface.
  • the individual carbon fibers preferably extend over the entire length of the carbon fiber arrangement, are therefore preferably through Filaments of matching length formed, which extend over the entire length of the secondary guide.
  • the carbon fiber arrangement is contacted with an outer connection conductor of the carbon brush, preferably designed as a pigtail, so that there is a direct electrical connection between the carbon fiber arrangement and the connection conductor independently of the carbon fitting.
  • a surface deviating from the axial end face of the carbon fitting, in particular arranged laterally to the end face, can be selected as the outer face.
  • the secondary guide device has two carbon fiber arrangements, wherein at least one is contacted via a tamping contact with a connection conductor of the carbon brush.
  • the secondary conducting device has two carbon fiber arrangements which are each contacted via a tamping contact with a connection conductor of the carbon brush, a functional separation of the carbon fiber arrangements can take place;
  • a carbon fiber assembly can be used as a wear contact, which causes a power cut when reaching a wear limit.
  • the earth contact according to the invention according to claim 6 for transmitting electrical currents between a stationary, a stator forming vehicle part and a relative to the stationary vehicle part moving, a rotor forming vehicle part has an at least a carbon brush according to one of the preceding claims comprising brush assembly.
  • the brush arrangement has at least two carbon brushes arranged at the same distance from a rotation axis whose carbon fiber arrangements are arranged with their contact ends at different contact points in the contact surface of the brush body, such that the contact points have different distances from the axis of rotation of the brush arrangement, and Carbon fiber assemblies define concentric orbits when rotating on the mating contact surface.
  • the brush assembly has at least two arranged at different distances to a rotation axis carbon brushes whose carbon fiber assemblies are arranged with their contact ends at matching contact points in the contact surface of the brush body, such that the contact points have different distances from the axis of rotation of the brush assembly and the carbon fiber assemblies define concentric orbits upon rotation on the mating contact surface.
  • Fig. 1 shows in isometric view a carbon brush 2 with a carbon fitting 13, which has two recesses 20 in its contact surface 6 opposite terminal end, in which connection conductor can be contacted via tamping contacts 11 of compressed conductive contact powder with a carbon fiber assembly 10, in a further recess 12th is received, which extends in the wear direction of the carbon fitting 13.
  • the recess 12 extends through the carbon brush 2 in its longitudinal direction perpendicular to the pad 6.
  • the fixed in the recess 12 carbon fiber assembly 10 is formed in the present case as a strand-like braid, with individual carbon fibers, which are used for stiffening in the CVD or CVI method with pyrolytically deposited Carbon coated.
  • the carbon fiber arrangement 10 is fixed to the carbon brush 2 by means of a two-component epoxy adhesive depot 14 at the contact end of the carbon brush 2 opposite the contact surface 6.
  • the recess 12 is designed in such a way that the carbon fiber arrangement 10 completely fills it, that is to say nestles it in a quasi nestled manner.
  • Fig. 3 is a ground contact shown, as it comes in rail vehicles used.
  • the ground contact 22 after Fig. 3 is suitable to transmit electrical currents between a stationary vehicle part of a rail vehicle and a rotating Fahrndil, so about a hub.
  • three carbon brushes 2a, 2b, 2c are arranged at uniform intervals in a brush holder 4, which are pressurized perpendicular to the contact surface and each have a carbon fiber arrangement 10a, 10b, 10c.
  • the carbon fiber arrangements 10a, 10b, 10c are each arranged in a recess 12a, 12b, 12c penetrating through the carbon brushes 2a, 2b, 2c and fixed to the respective carbon brush 2a, 2b, 2c by means of a two-component epoxy adhesive depot 14
  • the carbon fiber arrangements 10a, 10b, 10c of the carbon brushes 2a, 2b, 2c have different distances 16a, 16b, 16c to the axis of rotation 8.
  • About the axis of rotation 8 rotates the not shown wheel axle of the rail vehicle and thus also a non-illustrated mating contact surface of the wheel hub, such that the contact surface 6 rests against the mating contact surface.

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  • Motor Or Generator Current Collectors (AREA)

Description

Die Erfindung betrifft eine Kohlebürste gemäß dem Oberbegriff des Anspruchs 1 sowie einen Erdungskontakt nach Anspruch 6.The invention relates to a carbon brush according to the preamble of claim 1 and a grounding contact according to claim 6.

Derartige Kohlebürsten werden beispielsweise bei Elektromotoren oder Erdungskontakten von Fahrzeugen, insbesondere von Schienenfahrzeugen, eingesetzt. Die Kohlebürste stellt einen Kontakt zur Übertragung von elektrischen Strömen zwischen einem feststehenden Element und einem rotierenden Element her, wobei die Kohlebürste an einem Bürstenhalter angeordnet, und eine Kontaktfläche der Kohlebürste mit einer Kontaktkraft an einer Gegenkontaktfläche anliegt, und die Kontaktfläche oder die Gegenkontaktfläche um eine Rotationsachse rotiert.Such carbon brushes are used for example in electric motors or grounding contacts of vehicles, especially rail vehicles. The carbon brush makes contact for transmitting electrical currents between a fixed element and a rotating element, the carbon brush disposed on a brush holder, and a contact surface of the carbon brush with a contact force against a mating contact surface, and the contact surface or mating contact surface about an axis of rotation rotates.

Durch das Herstellen dieses Kontaktes zwischen dem feststehenden und dem rotationsfähigen Element ist es möglich, einen Stromkreis zu schließen. Bei Fahrzeugen, insbesondere Schienenfahrzeugen, erfüllt der Stromkreis insbesondere eine Erdungsfunktion.By making this contact between the fixed and the rotatable element, it is possible to close a circuit. In vehicles, in particular rail vehicles, the circuit in particular fulfills a grounding function.

Der Kontakt, welcher sich zwischen der Kontaktfläche der Kohlebürste und der Gegenkontaktfläche einstellt, ist jedoch Einflüssen ausgesetzt, welche die Übertragung eines Stroms zumindest erschweren. Insbesondere besteht bei den bekannten Kohlebürsten das Problem, dass durch den betriebsbedingten Eintrag von Ölen und Fetten die Kontaktfläche bzw. die Gegenkontaktfläche benetzt wird. Aufgrund der Oberflächenbenetzung bildet sich bei hochfrequenten Strömen ein nachteiliger Skin-Effekt, wonach der Stromfluss durch die Kohlebürste nicht gleichmäßig über den ganzen Querschnitt erfolgt, sondern der Stromfluss magnetfeldbedingt vorwiegend an den Außenrändern der Kohlebürste erfolgt. Der Skin-Effekt führt folglich dazu, dass sich der nutzbare Kohlebürstenquerschnitt für den Elektronenfluss stark verringert.The contact, which is established between the contact surface of the carbon brush and the mating contact surface, however, is exposed to influences, which at least complicate the transmission of a stream. In particular, in the known carbon brushes has the problem that the contact surface or the mating contact surface is wetted by the operational entry of oils and fats. Due to the surface wetting forms at high-frequency currents an adverse skin effect, according to which the current flow through the carbon brush does not occur uniformly over the entire cross-section, but the current flow takes place due to magnetic fields predominantly on the outer edges of the carbon brush. The skin effect consequently leads to a considerable reduction of the usable carbon brush cross section for the flow of electrons.

Aus der US 3,509,400 A ist eine Kohlebürste mit integrierter Kohlefaseranordnung bekannt, die sich in Längsrichtung des Bürstenkörpers erstreckt. Insbesondere weist die bekannte Kohlebürste eine an einem als Kohlenstoffformstück ausgebildeten Bürstenkörper ausgebildete Kontaktfläche der Kohlebürste auf. Die Kohlefaseranordnung bildet eine sich geradlinig in Abnutzungsrichtung des Bürstenkörpers erstreckende Sekundärleiteinrichtung aus, die mit Faserenden in der Kontaktfläche des Bürstenkörpers angeordnet ist.From the US 3,509,400 A a carbon brush with integrated carbon fiber assembly is known, which extends in the longitudinal direction of the brush body. In particular, the known carbon brush has a contact surface of the carbon brush formed on a brush body formed as a carbon molding. The carbon fiber arrangement forms a rectilinearly extending in the wear direction of the brush body secondary conducting device, which is arranged with fiber ends in the contact surface of the brush body.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Kohlebürste vorzuschlagen, welche der Ausbildung des Skin-Effekts entgegenwirkt.The invention is therefore based on the object to propose a carbon brush, which counteracts the formation of the skin effect.

Diese Aufgabe ist erfindungsgemäß durch eine Kohlebürste mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a carbon brush with the features of claim 1.

Erfindungsgemäß weist die Sekundärleiteinrichtung zumindest eine Kohlenstofffaseranordnung auf mit Kohlefasern, deren Faserenden in der Kontaktfläche angeordnet sind, so dass die Kohlenstofffasern nicht nur eine besonders effektive Stromführung ermöglichen, sonder darüber hinaus die Faserenden einen benetzenden Film aufreißen und einen unmittelbaren Kontakt zur Gegenkontaktfläche ermöglichen. Die einzelnen Kohlenstofffasern erstrecken sich vorzugsweise über die gesamte Länge der Kohlenstofffaseranordnung, sind also vorzugsweise durch Filamente übereinstimmender Länge gebildet, die sich über die Gesamtlänge der Sekundärleiteinrichtung erstrecken.According to the invention, the secondary guiding device has at least one carbon fiber arrangement with carbon fibers, the fiber ends of which are arranged in the contact surface, so that the carbon fibers not only allow a particularly effective current conduction, but moreover the fiber ends rupture a wetting film and allow direct contact with the mating contact surface. The individual carbon fibers preferably extend over the entire length of the carbon fiber arrangement, are therefore preferably through Filaments of matching length formed, which extend over the entire length of the secondary guide.

Erfindungsgemäß ist die Kohlenstofffaseranordnung mit einem vorzugsweise als Anschlusslitze ausgebildeten äußeren Anschlussleiter der Kohlebürste kontaktiert, so dass unabhängig vom Kohlenstoffformstück eine direkte elektrische Verbindung zwischen der Kohlenstofffaseranordnung und dem Anschlussleiter besteht.According to the invention, the carbon fiber arrangement is contacted with an outer connection conductor of the carbon brush, preferably designed as a pigtail, so that there is a direct electrical connection between the carbon fiber arrangement and the connection conductor independently of the carbon fitting.

Wenn die Kontaktierung der Kohlenstofffaseranordnung über einen Stampfkontakt erfolgt, ist ein besonders geringer Kontaktwiderstand ausgebildet.If the contacting of the carbon fiber arrangement takes place via a tamping contact, a particularly low contact resistance is formed.

Wenn der Stampfkontakt in einer schräg zur Kohlenstofffaseranordnung ausgerichteten und in die Ausnehmung der Kohlenstofffaseranordnung einmündenden Ausnehmung ausgebildet ist, kann als Anschlussfläche eine von der axialen Endfläche des Kohlenstoffformstück abweichende, insbesondere seitlich zur Endfläche angeordnete Fläche als äußere Anschlussfläche gewählt werden.If the tamping contact is formed in a recess aligned obliquely with respect to the carbon fiber arrangement and opening into the recess of the carbon fiber arrangement, a surface deviating from the axial end face of the carbon fitting, in particular arranged laterally to the end face, can be selected as the outer face.

Vorzugsweise weist die Sekundärleiteinrichtung zwei Kohlenstofffaseranordnungen aufweist, wobei zumindest eine über einen Stampfkontakt mit einem Anschlussleiter der Kohlebürste kontaktiert ist.Preferably, the secondary guide device has two carbon fiber arrangements, wherein at least one is contacted via a tamping contact with a connection conductor of the carbon brush.

Wenn die Sekundärleiteinrichtung zwei Kohlenstofffaseranordnungen aufweist, die jeweils über einen Stampfkontakt mit einem Anschlussleiter der Kohlebürste kontaktiert sind, kann eine funktionale Trennung der Kohlenstofffaseranordnungen erfolgen; beispielsweise kann eine Kohlenstofffaseranordnung als Verschleißkontakt genutzt werden, der eine Stromabschaltung bei Erreichen einer Verschleißgrenze bewirkt.If the secondary conducting device has two carbon fiber arrangements which are each contacted via a tamping contact with a connection conductor of the carbon brush, a functional separation of the carbon fiber arrangements can take place; For example, a carbon fiber assembly can be used as a wear contact, which causes a power cut when reaching a wear limit.

Der erfindungsgemäße Erdungskontakt nach Anspruch 6 zur Übertragung von elektrischen Strömen zwischen einem feststehenden, einen Stator ausbildenden Fahrzeugteil und einem relativ zu dem feststehen Fahrzeugteil bewegten, einen Rotor ausbildenden Fahrzeugteil, weist eine zumindest eine Kohlebürste nach einem der vorhergehenden Ansprüche umfassende Bürstenanordnung auf.The earth contact according to the invention according to claim 6 for transmitting electrical currents between a stationary, a stator forming vehicle part and a relative to the stationary vehicle part moving, a rotor forming vehicle part, has an at least a carbon brush according to one of the preceding claims comprising brush assembly.

Gemäß einer bevorzugten Ausführungsform weist die Bürstenanordnung zumindest zwei mit gleichem Abstand zu einer Rotationsachse angeordnete Kohlebürsten auf, deren Kohlefaseranordnungen mit ihren Kontaktenden an unterschiedlichen Kontaktstellen in der Kontaktfläche der Bürstenkörper angeordnet sind, derart, dass die Kontaktstellen unterschiedliche Abstände zur Rotationsachse der Bürstenanordnung aufweisen, und die Kohlefaseranordnungen bei Rotation auf der Gegenkontaktfläche konzentrische Kreisbahnen definieren.According to a preferred embodiment, the brush arrangement has at least two carbon brushes arranged at the same distance from a rotation axis whose carbon fiber arrangements are arranged with their contact ends at different contact points in the contact surface of the brush body, such that the contact points have different distances from the axis of rotation of the brush arrangement, and Carbon fiber assemblies define concentric orbits when rotating on the mating contact surface.

Gemäß einer alternativen Ausführungsform nach Anspruch 12 weist die Bürstenanordnung zumindest zwei mit unterschiedlichen Abständen zu einer Rotationsachse angeordnete Kohlebürsten auf, deren Kohlefaseranordnungen mit ihren Kontaktenden an übereinstimmenden Kontaktstellen in der Kontaktfläche der Bürstenkörper angeordnet sind, derart, dass die Kontaktstellen unterschiedliche Abstände zur Rotationsachse der Bürstenanordnung aufweisen, und die Kohlefaseranordnungen bei Rotation auf der Gegenkontaktfläche konzentrische Kreisbahnen definieren.According to an alternative embodiment according to claim 12, the brush assembly has at least two arranged at different distances to a rotation axis carbon brushes whose carbon fiber assemblies are arranged with their contact ends at matching contact points in the contact surface of the brush body, such that the contact points have different distances from the axis of rotation of the brush assembly and the carbon fiber assemblies define concentric orbits upon rotation on the mating contact surface.

Durch die vorstehenden alternativen Ausführungsformen ist es möglich, einen benetzenden Fett- oder Ölfilm an mehreren Stellen und somit großflächig aufzureißen. Durch die Definition mehrerer Kreisbahnen wird zudem die Gegenkontaktfläche gleichmäßig belastet.By means of the above alternative embodiments, it is possible to rupture a wetting fat or oil film at several points and thus over a large area. By defining several circular paths, the mating contact surface is additionally loaded evenly.

Ein Ausführungsbeispiel einer Kohlebürste nach der Erfindung ist in der Zeichnung schematisch vereinfacht dargestellt und wird in der nachfolgenden Beschreibung näher erläutert. Es zeigt:

Fig. 1
eine perspektivische Ansicht einer Ausführungsform einer Kohlebürste;
Fig. 2
einen Schnitt durch die Kohlebürste nach Fig. 1 entlang der Linie II-II;
Fig. 3
eine Draufsicht auf einen Erdungskontakt mit einer Mehrzahl von Kohlebürsten.
An embodiment of a carbon brush according to the invention is shown schematically simplified in the drawing and will be explained in more detail in the following description. It shows:
Fig. 1
a perspective view of an embodiment of a carbon brush;
Fig. 2
a section through the carbon brush after Fig. 1 along the line II-II;
Fig. 3
a plan view of a grounding contact with a plurality of carbon brushes.

Fig. 1 zeigt in isometrischer Darstellung eine Kohlebürste 2 mit einem Kohlenstoffformstück 13, das in seinem einer Kontaktfläche 6 gegenüber liegenden Anschlussende zwei Ausnehmungen 20 aufweist, in welchen Anschlussleiter über Stampfkontakte 11 aus komprimiertem leitfähigem Kontaktpulver mit einer Kohlenstofffaseranordnung 10 kontaktiert werden können, die in einer weitere Ausnehmung 12 aufgenommen ist, die sich in Abnutzungsrichtung des Kohlenstoffformstücks 13 erstreckt. Fig. 1 shows in isometric view a carbon brush 2 with a carbon fitting 13, which has two recesses 20 in its contact surface 6 opposite terminal end, in which connection conductor can be contacted via tamping contacts 11 of compressed conductive contact powder with a carbon fiber assembly 10, in a further recess 12th is received, which extends in the wear direction of the carbon fitting 13.

Die Ausnehmung 12 durchgreift die Kohlebürste 2 in ihrer Längsrichtung senkrecht zur Anschlussfläche 6. Die in der Ausnehmung 12 fixierte Kohlenstofffaseranordnung 10 ist im vorliegenden Fall als ein litzenförmiges Geflecht ausgebildet, mit einzelnen Kohlenstofffasern, die zur Versteifung im CVD- oder CVI-Verfahren mit pyrolytisch abgeschiedenem Kohlenstoff beschichtet sind.The recess 12 extends through the carbon brush 2 in its longitudinal direction perpendicular to the pad 6. The fixed in the recess 12 carbon fiber assembly 10 is formed in the present case as a strand-like braid, with individual carbon fibers, which are used for stiffening in the CVD or CVI method with pyrolytically deposited Carbon coated.

An dem der Kontaktfläche 6 gegenüberliegenden Kontaktende der Kohlebürste 2 ist die Kohlenstofffaseranordnung 10 mittels eines Zweikomponenten-Epoxidkleberdepots 14 an der Kohlebürste 2 fixiert. Die Ausnehmung 12 ist derart ausgeführt, dass die Kohlenstofffaseranordnung 10 diese gänzlich ausfüllt, also quasi angeschmiegt in dieser eingebettet ist.The carbon fiber arrangement 10 is fixed to the carbon brush 2 by means of a two-component epoxy adhesive depot 14 at the contact end of the carbon brush 2 opposite the contact surface 6. The recess 12 is designed in such a way that the carbon fiber arrangement 10 completely fills it, that is to say nestles it in a quasi nestled manner.

In Fig. 3 ist ein Erdungskontakt abgebildet, wie er bei Schienenfahrzeugen zum Einsatz kommt. Der Erdungskontakt 22 nach Fig. 3 ist geeignet, elektrische Ströme zwischen einem feststehenden Fahrzeugteil eines Schienenfahrzeugs und einem rotierenden Fahrzeigteil, also etwa einer Radnabe zu übertragen. Hierzu sind in gleichmäßigen Abständen in einem Bürstenhalter 4 drei Kohlebürsten 2a, 2b, 2c angeordnet, welche senkrecht zur Kontaktfläche druckbeaufschlagt sind und je eine Kohlenstofffaseranordnung 10a, 10b, 10c aufweisen. Die Kohlenstofffaseranordnungen 10a, 10b, 10c sind jeweils in einer die Kohlebürsten 2a, 2b, 2c durchgreifenden Ausnehmung 12a, 12b, 12c angeordnet und mittels eines Zweikomponenten-Epoxidklebstoffdepots 14 an der jeweiligen Kohlebürste 2a, 2b, 2c fixiertIn Fig. 3 is a ground contact shown, as it comes in rail vehicles used. The ground contact 22 after Fig. 3 is suitable to transmit electrical currents between a stationary vehicle part of a rail vehicle and a rotating Fahrzeigteil, so about a hub. For this purpose, three carbon brushes 2a, 2b, 2c are arranged at uniform intervals in a brush holder 4, which are pressurized perpendicular to the contact surface and each have a carbon fiber arrangement 10a, 10b, 10c. The carbon fiber arrangements 10a, 10b, 10c are each arranged in a recess 12a, 12b, 12c penetrating through the carbon brushes 2a, 2b, 2c and fixed to the respective carbon brush 2a, 2b, 2c by means of a two-component epoxy adhesive depot 14

Die Kohlenstofffaseranordnungen 10a, 10b, 10c der Kohlebürsten 2a, 2b, 2c weisen unterschiedliche Abstände 16a, 16b, 16c zur Rotationsachse 8 auf. Um die Rotationsachse 8 rotiert die nicht weiter dargestellte Radachse des Schienenfahrzeugs und somit auch eine nicht näher dargestellte Gegenkontaktfläche der Radnabe, derart, dass die Kontaktfläche 6 an der Gegenkontaktfläche anliegt. Durch die unterschiedlichen Abstände 16a, 16b, 16c zur Rotationsachse 8 definiert jede der drei Kohlenstofffaseranordnungen 10a, 10b, 10c eine separate Kreisbahn 18a, 18b, 18c auf der Gegenkontaktfläche.The carbon fiber arrangements 10a, 10b, 10c of the carbon brushes 2a, 2b, 2c have different distances 16a, 16b, 16c to the axis of rotation 8. About the axis of rotation 8 rotates the not shown wheel axle of the rail vehicle and thus also a non-illustrated mating contact surface of the wheel hub, such that the contact surface 6 rests against the mating contact surface. Due to the different distances 16a, 16b, 16c to the rotation axis 8, each of the three carbon fiber arrangements 10a, 10b, 10c defines a separate circular path 18a, 18b, 18c on the mating contact surface.

Claims (8)

  1. Carbon brush (2) for forming an electric contact between a current-conducting stator and a current-conducting rotor in such a manner that a contact surface (6) of the brush formed at a brush body formed as a carbon moulded part (13) abuts against a counter contact surface of the stator or rotor, the brush body comprising a secondary conducting device preferably extending straight in the direction of consumption of the brush body, said secondary conducting device being arranged in the contact surface of the brush body with a contact end and comprising at least one carbon fiber arrangement (10) having carbon fibers whose fiber ends are arranged in the contact surface,
    characterized in that
    the carbon fiber arrangement (10) is contacted to a connecting conductor of the carbon brush.
  2. Carbon brush according to claim 1,
    characterized in that
    contacting the carbon fiber arrangement (10) is carried out via a tamping contact (11).
  3. Carbon brush according to claim 2,
    characterized in that
    the tamping contact (11) is formed in a recess (20) arranged inclined to the carbon fiber arrangement and opening into the recess (12) of the carbon fiber arrangement (10).
  4. Carbon brush according to claim 2 or 3,
    characterized in that
    the secondary conducting device comprises two carbon fiber arrangements (10), at least one of which being contacted to a connecting conductor of the brush via a tamping contact (11).
  5. Carbon brush according to claim 4,
    characterized in that
    both carbon fiber arrangements (10) are contacted to a connecting conductor of the carbon brush via a tamping contact (11).
  6. Ground contact, in particular a ground contact for a rail vehicle, for transmitting electric currents between a stationary vehicle part forming a stator and a vehicle part moved relative to the stationary vehicle part and forming a rotor, having a brush arrangement comprising at least one carbon brush (2) according to the preceding claims.
  7. Ground contact according to claim 6,
    characterized in that
    the brush arrangement comprises at least two carbon brushes (2a, 2b, 2c) arranged at equal distance to a rotational axis (8), the carbon fiber arrangements (10) of the carbon brushes (2a, 2b, 2c) being arranged at different contacting positions in the contact surface (6) of the brush body with their contact ends in such a manner that the contacting positions (10a, 10b, 10c) have different distances (16a, 16b, 16c) to the rotational axis of the brush arrangement, and the carbon fiber arrangements define concentric circular paths when rotating on the counter contact surface.
  8. Ground contact according to claim 6,
    characterized in that
    the brush arrangement comprises at least two carbon brushes (2a, 2b, 2c) arranged at different distances to a rotational axis (8), the carbon fiber arrangements (10) of the carbon brushes (2a, 2b, 2c) being arranged at identical contacting positions in the contact surface (6) of the brush body with their contact ends in such a manner that the contacting positions (10a, 10b, 10c) comprise different distances (16a, 16b, 16c) to the rotational axis of the brush arrangement, and the carbon fiber arrangements define concentric circular paths when rotating on the counter contact surface.
EP14197186.1A 2013-12-10 2014-12-10 Carbon brush Active EP2884602B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14197186T PL2884602T3 (en) 2013-12-10 2014-12-10 Carbon brush

Applications Claiming Priority (1)

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DE102013020386.4A DE102013020386A1 (en) 2013-12-10 2013-12-10 carbon brush

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EP2884602A1 EP2884602A1 (en) 2015-06-17
EP2884602B1 true EP2884602B1 (en) 2017-02-08

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US10931179B2 (en) 2018-03-20 2021-02-23 Aktiebolaget Skf Fiber grounding brush
CN111137181A (en) * 2020-01-02 2020-05-12 中车株洲电力机车有限公司 Grounding device, bogie and rail transit rolling stock

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FR1470029A (en) * 1966-02-24 1967-02-17 Composite brush for collector ring of electrical appliances
DE1261589B (en) * 1966-05-17 1968-02-22 Sigri Elektrographit Gmbh Commutator brushes made of charcoal or electrographite and process for their manufacture
DE1638186A1 (en) * 1967-03-13 1970-01-29 Carbone Ag Pressed carbon brush for small electric motors and small dynamos
GB1369835A (en) * 1971-12-20 1974-10-09 Morganite Carbon Ltd Brushes for electric machines
US3886386A (en) * 1973-08-01 1975-05-27 Gen Electric Carbon fiber current collection brush
DE3239003A1 (en) * 1982-10-21 1984-04-26 Hübner Elektromaschinen AG, 1000 Berlin Carbon brush for electrical machines
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EP2884602A1 (en) 2015-06-17
PL2884602T3 (en) 2017-07-31
DE102013020386A1 (en) 2015-06-11

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