EP2884602A1 - Brosse à charbon - Google Patents

Brosse à charbon Download PDF

Info

Publication number
EP2884602A1
EP2884602A1 EP14197186.1A EP14197186A EP2884602A1 EP 2884602 A1 EP2884602 A1 EP 2884602A1 EP 14197186 A EP14197186 A EP 14197186A EP 2884602 A1 EP2884602 A1 EP 2884602A1
Authority
EP
European Patent Office
Prior art keywords
brush
carbon
contact
arrangement
carbon fiber
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.)
Granted
Application number
EP14197186.1A
Other languages
German (de)
English (en)
Other versions
EP2884602B1 (fr
Inventor
Gerhard DENNER
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.)
Schunk Wien GmbH
Original Assignee
Schunk Wien GmbH
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
Application filed by Schunk Wien GmbH filed Critical Schunk Wien GmbH
Priority to PL14197186T priority Critical patent/PL2884602T3/pl
Publication of EP2884602A1 publication Critical patent/EP2884602A1/fr
Application granted granted Critical
Publication of EP2884602B1 publication Critical patent/EP2884602B1/fr
Not-in-force legal-status Critical Current
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
    • 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 for forming an electrical contact between a current-carrying stator and a current-carrying rotor, such that a contact surface formed on a formed as a carbon body brush surface of the carbon brush abuts against a mating contact surface of the stator or rotor, wherein the brush body is preferably a straight line in Wear direction of the brush body extending secondary guide, which is arranged with a contact end in the contact surface of the brush body.
  • 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 is exposed to influences which at least make the transmission of a current more difficult.
  • 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 magnetic field mainly at 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.
  • 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 whose fiber ends are arranged in the contact surface, so that the carbon fibers not only enable 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 assembly, so are preferably formed by filaments of matching length, which extend over the entire length of the secondary guide.
  • the carbon fiber arrangement is accommodated within the brush body embedded in a recess.
  • the integration of the carbon fiber arrangement in the carbon brush leads to the fact that the shaped body can be used for supporting or stiffening the carbon fibers.
  • the carbon fibers of the carbon fiber assembly are arranged in a support matrix, which may be formed by an outer cladding of the carbon fiber assembly or by a stiffened formation of the individual carbon fibers.
  • the carbon fibers of the carbon fiber arrangement for stiffening can form a stranded or wire-shaped fiber braid.
  • the carbon fiber assembly is contacted with a preferably designed as a pigtail outer terminal conductor of the carbon brush, so that there is a direct electrical connection between the carbon fiber assembly and the terminal conductor regardless 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 10 for the transmission of electrical currents between a stationary, a stator forming vehicle part and a moving relative to the stationary vehicle part, a rotor forming vehicle part comprises a brush assembly according to at least one brush according to one of the preceding claims.
  • the brush arrangement has at least two carbon brushes arranged concentrically to a rotation axis of the brush arrangement on a brush circle 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 ,
  • the brush arrangement has at least two carbon brushes arranged at different distances from a rotation axis of the brush arrangement on a brush circle whose carbon fiber arrangements are arranged with their contact ends at matching contact points in the contact surface of the brush bodies, such that the contact points have different distances have to the axis of rotation of the brush assembly.
  • 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 connection surface 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 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 such that the carbon fiber assembly 10 completely fills it, that is quasi nestled nestled in this.
  • 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.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
EP14197186.1A 2013-12-10 2014-12-10 Brosse à charbon Not-in-force EP2884602B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14197186T PL2884602T3 (pl) 2013-12-10 2014-12-10 Szczotka węglowa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013020386.4A DE102013020386A1 (de) 2013-12-10 2013-12-10 Kohlebürste

Publications (2)

Publication Number Publication Date
EP2884602A1 true EP2884602A1 (fr) 2015-06-17
EP2884602B1 EP2884602B1 (fr) 2017-02-08

Family

ID=52016486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14197186.1A Not-in-force EP2884602B1 (fr) 2013-12-10 2014-12-10 Brosse à charbon

Country Status (3)

Country Link
EP (1) EP2884602B1 (fr)
DE (1) DE102013020386A1 (fr)
PL (1) PL2884602T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110311275A (zh) * 2018-03-20 2019-10-08 斯凯孚公司 纤维接地刷、包括纤维接地刷的组件和安装该组件的方法
CN111137181A (zh) * 2020-01-02 2020-05-12 中车株洲电力机车有限公司 一种接地装置、转向架和轨道交通机车车辆

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739255A (en) * 1954-11-16 1956-03-20 Stackpole Carbon Co High altitude brushes
FR1470029A (fr) * 1966-02-24 1967-02-17 Balai composite pour anneau collecteur d'appareils électriques
US3509400A (en) * 1966-05-17 1970-04-28 Sigri Elektrographit Gmbh Commutator carbon brush and method of its manufacture
US3886386A (en) * 1973-08-01 1975-05-27 Gen Electric Carbon fiber current collection brush

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1638186A1 (de) * 1967-03-13 1970-01-29 Carbone Ag Gepresste Kohlebuerste fuer Kleinelektromotoren und Kleindynamos
GB1369835A (en) * 1971-12-20 1974-10-09 Morganite Carbon Ltd Brushes for electric machines
DE3239003A1 (de) * 1982-10-21 1984-04-26 Hübner Elektromaschinen AG, 1000 Berlin Kohlebuerste fuer elektrische maschine
DE4127336A1 (de) * 1991-08-19 1993-02-25 Schunk Metall & Kunststoff Haltevorrichtung fuer an schienenfahrzeugen als rueckstrom- und/oder erdungskontakt eingesetzte buersten und verfahren zur herstellung einer solchen haltevorrichtung
DE19913599A1 (de) * 1999-03-25 2000-09-28 Schunk Kohlenstofftechnik Gmbh Mehrschicht-Kohlebürste
FR2889628B1 (fr) * 2005-08-08 2007-11-09 Valeo Systemes Dessuyage Balai et machine electrique tournante equipee d'un tel balai
JP2007097254A (ja) * 2005-09-27 2007-04-12 Toshiba Ceramics Co Ltd 電気機械用ブラシ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739255A (en) * 1954-11-16 1956-03-20 Stackpole Carbon Co High altitude brushes
FR1470029A (fr) * 1966-02-24 1967-02-17 Balai composite pour anneau collecteur d'appareils électriques
US3509400A (en) * 1966-05-17 1970-04-28 Sigri Elektrographit Gmbh Commutator carbon brush and method of its manufacture
US3886386A (en) * 1973-08-01 1975-05-27 Gen Electric Carbon fiber current collection brush

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110311275A (zh) * 2018-03-20 2019-10-08 斯凯孚公司 纤维接地刷、包括纤维接地刷的组件和安装该组件的方法
US11309775B2 (en) 2018-03-20 2022-04-19 Aktiebolaget Skf Fiber grounding brush assembly
CN111137181A (zh) * 2020-01-02 2020-05-12 中车株洲电力机车有限公司 一种接地装置、转向架和轨道交通机车车辆

Also Published As

Publication number Publication date
DE102013020386A1 (de) 2015-06-11
PL2884602T3 (pl) 2017-07-31
EP2884602B1 (fr) 2017-02-08

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