EP1702390A1 - Balai de charbon ainsi que procede et materiau pour la fabrication dudit balai - Google Patents

Balai de charbon ainsi que procede et materiau pour la fabrication dudit balai

Info

Publication number
EP1702390A1
EP1702390A1 EP04803858A EP04803858A EP1702390A1 EP 1702390 A1 EP1702390 A1 EP 1702390A1 EP 04803858 A EP04803858 A EP 04803858A EP 04803858 A EP04803858 A EP 04803858A EP 1702390 A1 EP1702390 A1 EP 1702390A1
Authority
EP
European Patent Office
Prior art keywords
metal
carbon brush
sintering
base
powdery
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
EP04803858A
Other languages
German (de)
English (en)
Other versions
EP1702390B1 (fr
Inventor
Gerhard Bachauer
Christian Böttger
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.)
Hoffmann and Co Elektrokohle AG
Original Assignee
Hoffmann and Co Elektrokohle AG
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 Hoffmann and Co Elektrokohle AG filed Critical Hoffmann and Co Elektrokohle AG
Publication of EP1702390A1 publication Critical patent/EP1702390A1/fr
Application granted granted Critical
Publication of EP1702390B1 publication Critical patent/EP1702390B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H01R39/38—Brush holders
    • H01R39/39—Brush holders wherein the brush is fixedly mounted in the holder
    • 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
    • H01R39/20—Contacts for co-operation with commutator or slip-ring, e.g. contact brush characterised by the material thereof

Definitions

  • Carbon brushes for electric motors or generators must be fastened to a holder which ensures the necessary system pressure on the commutator or the like and which enables the movement of the carbon brush to be adjusted in accordance with the wear.
  • a leaf spring which is particularly suitable for the carbon brush because of its simplicity, cost-effectiveness and low weight is a leaf spring which, in addition to the function of the holder and guide, can also take over the function of power transmission.
  • the problem of fastening the carbon brush to the leaf spring arises in such a way that, on the one hand, the required mechanical strength in continuous operation and, on the other hand, the transmission of high currents is ensured.
  • a carbon brush for a gasoline pump motor which is soldered to a leaf spring serving as a support and for this purpose has a solderable layer consisting of a copper layer and a tin layer applied thereon.
  • metallizations or, as a rule, galvanically applied metal layers it is difficult to produce a soldered or welded connection between the carbon brush and the leaf spring, which has sufficient mechanical, thermal and electrical resilience for continuous operation.
  • the tension compensation between the carbon brush and the leaf spring is problematic due to the different mode of elasticity and thermal expansion coefficient.
  • the invention is based on the object of specifying a carbon brush as well as a method and a material for its production which enables a simple, mechanically and electrically highly loadable connection to a leaf spring.
  • a carbon brush which, in addition to the usual single-layer or multi-layer base body made of pressed and sintered carbon material, has at least one outer layer made of metallic material, which ensures that the carbon brush can be welded or soldered, this metal layer likewise being produced by pressing and sintering and with is connected to the base body.
  • a suitable welding process e.g. ultrasonic welding, laser welding or the like
  • soldering process e.g. soldering process
  • a material must be available for the production of the carbon brushes with a weldable metal layer that is good for powder metallurgical processing connects with the carbon material of the base body of the carbon brush and, on the other hand, is easy to weld or solder using the selected method.
  • pure copper and its alloys as well as iron or steel are not suitable because their coefficient of thermal expansion and modulus of elasticity are not compatible with that of the carbon material of the base body of the carbon brush in the sintering process. Materials that are similar to the carbon material of the base body of the carbon brush are also excluded, since they cannot be welded due to the graphite content they contain.
  • component A makes up the majority, preferably more than 80%, of the material and preferably consists of copper or a copper alloy with, for example, Sn, Zn, Ni or Ag. It is preferably in powder form with an average diameter D 50 of 15 to 25 ⁇ m.
  • Component B is an additional metal that has a higher ductility and lower melting point than component A.
  • the melting point is 400 ° C. or below and the elongation at break is 5% or above.
  • the component B preferably consists of Sn or an alloy of Sn with, for example, Cu, Ag, Sb, Zn, Ga, In, Bi or Pb.
  • the metal component B can also consist of In and / or Bi or an alloy with In or Bi. Its share in the total powder mixture of the material is preferably 1.5 to 15 percent by weight.
  • the additional metal B is preferably in an average grain size D 50 of 15 to 35 ⁇ m.
  • the material can preferably contain one or more non-metallic, organic and / or inorganic additives C in powder form.
  • non-metallic, organic and / or inorganic additives C are stearates, graphite, talc, SiC or Al 2 O 3 .
  • Their average grain size D 50 is preferably not more than 20 ⁇ m.
  • composition of the material is (data in percent by weight): A: 92% Cu (D 50 15 - 25 ⁇ m) B: 7.5% Sn (D 50 15 - 55 ⁇ m) C: 0.5% graphite ( D 50 ⁇ 20 ⁇ m).
  • the specified material can be processed perfectly by powder metallurgy by pressing and sintering and combines excellently with the functional layer (base body) of the carbon brush to form a metal layer with excellent weldability and solderability. It has been shown that the low-melting and ductile metal B wets the base metal A during pressing and sintering, but does not diffuse or diffuses into it. This ensures that the predominant or at least sufficient part of the metal B is not alloyed with the metal A after the sintering, but is present in pure form, and thus the desired ductility of the metal layer is achieved.
  • the ductility of the material enables tension compensation between the base body 1 of the carbon brush and the welding track metal layer (2) on the one hand and the leaf spring welded to the metal layer (2) on the other hand.
  • the base metal A and at least the major part of the further metal B form two separate metal phases, which are intimately connected to one another by the pressing and sintering, but are essentially not alloyed with one another.
  • the heat treatment i.e. H. the sintering of the metal layer is carried out at a temperature which is lower than the melting point of the base metal A but higher than the melting point of the further metal B. It is therefore preferably a liquid sintering in which the further metal B is in the liquid phase, while the base metal A is in the solid, powdery phase. If the base metal A is copper and the further metal B is tin, the sintering temperature is advantageously in the range from 300 to 700 ° C., preferably in the range from 400 to 500 ° C.
  • the non-metallic, organic or inorganic additive C is not wetted by the metal B during the sintering process and thereby prevents an undesirably large diffusion of the metal B into the base metal A.
  • the carbon brush has a base body 1, which is produced in the usual manner in one or more layers from a common carbon material for carbon brushes, in particular a graphite mixture with additives, by pressing and heat treatment (sintering).
  • a base body 1 Connected to the base body 1 is the easily weldable or solderable metal layer (2), which is also produced from the above-mentioned powdery material according to the invention by pressing and optionally sintering and is non-detachably connected to the base body 1.
  • the base body 1 and weldable metal layer 2 can be produced and pressed together at the same time by pressing and sintering, or the base body 1 can be prefabricated and the weldable metal layer 2 can be molded onto it subsequently by pressing and sintering.
  • the easily weldable metal layer 2 makes it possible to attach the entire carbon brush by welding to a leaf spring 3, for example by welding spots 4 or z. B. by a continuous weld.
  • the thickness of the sintered metal layer 2 depends on the requirements of the welding or soldering method chosen for the connection with the leaf spring 3.
  • the thickness of the metal layer 2 is preferably in the range from 0.2 to 5 mm.
  • a thickness of the metal layer 2 of less than 1 mm, in particular in the range from 0.2 to 0.5 mm, should be sufficient for a solder connection to the leaf spring 2.
  • a thickness of at least 1 mm, e.g. B. in the range of 2 to 4 mm may be advantageous.

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

L'invention concerne un balai de charbon présentant un corps de base, fabriqué à partir d'un matériau carboné par pressage et éventuellement frittage, ainsi qu'une couche d'un matériau métallique, appliquée sur une surface extérieure du corps de base par pressage et éventuellement frittage, la couche métallique pouvant être liée à un support métallique par soudage ou brasage.
EP04803858A 2003-12-19 2004-12-14 Balai de charbon ainsi que procédé et matériau pour la fabrication dudit balai Active EP1702390B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10359896A DE10359896A1 (de) 2003-12-19 2003-12-19 Kohlebürste sowie Verfahren und Werkstoff zu ihrer Herstellung
PCT/EP2004/014235 WO2005064756A1 (fr) 2003-12-19 2004-12-14 Balai de charbon ainsi que procede et materiau pour la fabrication dudit balai

Publications (2)

Publication Number Publication Date
EP1702390A1 true EP1702390A1 (fr) 2006-09-20
EP1702390B1 EP1702390B1 (fr) 2007-12-05

Family

ID=34683604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04803858A Active EP1702390B1 (fr) 2003-12-19 2004-12-14 Balai de charbon ainsi que procédé et matériau pour la fabrication dudit balai

Country Status (8)

Country Link
US (1) US20060260436A1 (fr)
EP (1) EP1702390B1 (fr)
JP (1) JP2007515146A (fr)
CN (1) CN1902792A (fr)
AT (1) ATE380408T1 (fr)
DE (2) DE10359896A1 (fr)
ES (1) ES2297520T3 (fr)
WO (1) WO2005064756A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051678A1 (de) * 2006-10-30 2008-05-15 Schunk Modultechnik Gmbh Schleifkontakt
JP2008118831A (ja) 2006-11-08 2008-05-22 Mabuchi Motor Co Ltd 金属黒鉛質ブラシ
DE102007026265B4 (de) 2007-06-05 2014-04-10 Gerhard Präzisionspresstechnik GmbH Kohlebürste
DE102008059478B4 (de) 2008-11-28 2015-07-30 Schunk Kohlenstofftechnik Gmbh Kohlebürste zur Übertragung hoher Ströme
EP2431488A4 (fr) * 2009-04-28 2013-12-11 Taiho Kogyo Co Ltd Matiere de glissement frittee a base de cuivre sans plomb et piece de glissement
FR2972082B1 (fr) 2011-02-28 2013-03-29 Mersen France Amiens Sas Balai de contact
DE102011015579B4 (de) * 2011-03-30 2017-03-23 Heraeus Deutschland GmbH & Co. KG Elastischer Schleifkontakt und Verfahren zu dessen Herstellung
CN106329286B (zh) * 2015-07-01 2019-06-11 苏州东南佳新材料股份有限公司 一种动车组接地回流装置用电刷的制备方法
DE102017209340B4 (de) * 2017-06-01 2022-12-15 Schunk Carbon Technology Gmbh Ableitvorrichtung zur Ableitung elektrischer Ströme
CN109244686B (zh) * 2018-07-26 2021-06-18 合德华厦安防科技有限公司 一种用于接地系统的芯棒及其制备方法
WO2023086436A1 (fr) * 2021-11-10 2023-05-19 National Electrical Carbon Products, Inc. Balai de charbon

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1259454A (fr) * 1968-05-23 1972-01-05
DE2444957C2 (de) * 1974-09-20 1982-08-12 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur Herstellung eines Verbundwerkstoffs aus kohlenstoffhaltigem Pulver und Metallpulver
JPS57185685A (en) * 1981-05-09 1982-11-15 Toho Beslon Co Brush for electric machine and method of producing same
ATE123360T1 (de) * 1991-07-22 1995-06-15 Carbone Ag Gleitkontaktstück für hohe stromdichten.
DE19900023A1 (de) * 1999-01-02 2000-07-06 Carbone Ag Verfahren zur Herstellung einer Bürste aus einem pulverförmigen Werkstoff sowie eine Bürste, die nach einem solchen Verfahren hergestellt ist
DE10207406A1 (de) * 2002-02-21 2003-09-11 K Tec Gmbh Halterung für eine Kohlebürste

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005064756A1 *

Also Published As

Publication number Publication date
WO2005064756A1 (fr) 2005-07-14
ATE380408T1 (de) 2007-12-15
ES2297520T3 (es) 2008-05-01
CN1902792A (zh) 2007-01-24
US20060260436A1 (en) 2006-11-23
JP2007515146A (ja) 2007-06-07
DE502004005669D1 (de) 2008-01-17
DE10359896A1 (de) 2005-07-21
EP1702390B1 (fr) 2007-12-05

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