DE3344556A1 - METHOD FOR REDUCING AND STABILIZING THE TRANSITION RESISTANCE BETWEEN A CHARCOAL BRUSH AND A CONNECTING LAMP - Google Patents

METHOD FOR REDUCING AND STABILIZING THE TRANSITION RESISTANCE BETWEEN A CHARCOAL BRUSH AND A CONNECTING LAMP

Info

Publication number
DE3344556A1
DE3344556A1 DE19833344556 DE3344556A DE3344556A1 DE 3344556 A1 DE3344556 A1 DE 3344556A1 DE 19833344556 DE19833344556 DE 19833344556 DE 3344556 A DE3344556 A DE 3344556A DE 3344556 A1 DE3344556 A1 DE 3344556A1
Authority
DE
Germany
Prior art keywords
stabilizing
strand
reducing
bent
wire
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.)
Ceased
Application number
DE19833344556
Other languages
German (de)
Inventor
Walter Dr. 7000 Stuttgart Holl
Rolf 7054 Korb Lamparter
Martin 7000 Stuttgart Scholpp
Berthold 7052 Schwaikheim Ulrich
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19833344556 priority Critical patent/DE3344556A1/en
Priority to EP84113666A priority patent/EP0148367B1/en
Priority to DE8484113666T priority patent/DE3465228D1/en
Publication of DE3344556A1 publication Critical patent/DE3344556A1/en
Ceased legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00Rotary current collectors, distributors or interrupters
    • H01R39/02Details for dynamo electric machines
    • H01R39/36Connections of cable or wire to brush

Landscapes

  • Motor Or Generator Current Collectors (AREA)
  • Manufacturing Of Electrical Connectors (AREA)

Description

.2-.2-

R. 19Ο91*R. 19Ο9 1 *

6. 12.83 Pf/Jä6.12.83 pfennigs / year

ROBERT BOSCH GMBH, 7OOO Stuttgart 1ROBERT BOSCH GMBH, 7OOO Stuttgart 1

Verfahren zur Senkung und Stabilisierung des Übergangswiderstandes zwischen einer Kohlebürste und einer Anschlußlitze Process for lowering and stabilizing the contact resistance between a carbon brush and a lead wire

Stand der TechnikState of the art

Die Erfindung geht aus von einem Verfahren nach der Gattung des Hauptanspruchs. Ein großer Teil der Kohlebürsten wird heute durch Pressen in einem Gesenk hergestellt. Dabei ist es am wirtschaftlichsten, wenn die Anschlußlitzen gleich mit eingepreßt werden. Hierzu wird ein gerades Litzenende in die Pulvermischung eingetaucht .und das Pulver dann verdichtet. Die Güte der Verankerung ist unter anderem abhängig von der verwendeten Kohlemischung und vom Querschnitt der Litze. Hochohmige Kohlebürsten sowie kleine Litzenquerschnitte ergeben große Übergangswiderstände. Diese wiederum reagieren empfindlich auf äußere und innere Einflüsse wie Oxidation infolge von Temperatur- und Klimawechsel sowie auf Erschütterung und auf den durchfließenden elektrischen Strom. Je höher der Anfangswiderstand, umso grosser ist die Gefahr einer stetigen Widerstands zunähme. Die Folge solcher Vorgänge ist ein Leistungsverlust sowie eine Aufheizung der Kontaktstelle durch den Strom. Eine Möglichkeit, diesem Problem beizukommen, ist die Verwendung von Litzen, die im Kontaktbereich versilbert sind. Solche Litzen sind jedoch teuer und stellen nicht unbedingt eine Lösung des aufgezeigten Problems dar.The invention is based on a method of the type of the main claim. A large part of the carbon brushes is produced today by pressing in a die. Included it is most economical if the pigtails are pressed in at the same time. A straight end of the strand is required for this immersed in the powder mixture. and then compacted the powder. The goodness of the anchoring is among other things depending on the carbon mixture used and the cross-section of the strand. High-resistance carbon brushes and small strand cross-sections result in large contact resistances. These in turn are sensitive to external and internal influences such as oxidation as a result of temperature and climate changes as well as on vibration and on the electrical flowing through Current. The higher the initial resistance, the greater is the risk of steady resistance increasing. the Such processes result in a loss of power and the contact point being heated up by the current. A possibility, To deal with this problem, the use of strands that are silver-plated in the contact area. Such However, stranded wires are expensive and do not necessarily represent a solution to the problem identified.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß der Anfangswiderstand gegenüber den geraden Litzenenden um mindestens 50 % niedriger liegt und auch im weiteren Verlauf konstant bleibt. Das umgebogene Litzenende erhält bei der Verdichtung eine pilzförmige Verankerung in der Kohlebürste, und durch den besseren Formschluß und die größere gemeinsame Oberfläche zwischen Litze und Kohlebürste ist der Kontakt wesentlich besser; darüber hinaus,sind die Kosten kaum höher als bei dem Verfahren mit einem geraden Litzenende.The method according to the invention with the characterizing features of the main claim has the advantage that the initial resistance compared to the straight strand ends is at least 50 % lower and also remains constant in the further course. The bent strand end receives a mushroom-shaped anchorage in the carbon brush during compression, and the contact is much better due to the better form fit and the larger common surface between the strand and the carbon brush; moreover, the cost is hardly higher than the method with a straight strand end.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Verfahrens möglich. Besonders vorteilhaft ist es, wenn das Litzenende um 18O° umgebogen wird und das umgebogene Ende der Litze etwa dem 0,5-fachen der Gesamteintauchmenge entspricht.By the measures listed in the subclaims advantageous developments and improvements of the method specified in the main claim are possible. Particularly It is advantageous if the strand end is bent over by 180 ° and the bent end of the strand is approximately 0.5 times the total amount of immersion.

Beschreibung eines AusführungsbeispielsDescription of an exemplary embodiment

100 Gewichtsteile Haturgraphit werden mit 10 Gewichtsteilen Polyphenylensulfid in feingemahlener Form gründlich gemischt und in ein Preßgesenk, dessen innere Form der herzustellenden Bürste entspricht, eingefüllt. In dieses Pulvergemisch100 parts by weight of hard graphite are combined with 10 parts by weight Polyphenylene sulfide in finely ground form thoroughly mixed and filled into a press die, the inner shape of which corresponds to the brush to be manufactured. In this powder mixture

wird eine um 18O° gebogene Kupferlitze von 0,5 mm Querschnitt, deren umgebogenes Ende 5 mm lang ist, etwa 10 mm in das lockere Pulver eintaucht und das Ganze dann beia copper braid with a cross-section of 0.5 mm, bent by 180 °, the bent end of which is 5 mm long, about 10 mm dipped into the loose powder and then the whole thing

einem Druck von k t/cm gepreßt, wobei die Litze durch ein entsprechendes Loch im Oberstempel hindurchgeführt ist.a pressure of k t / cm pressed, whereby the strand is passed through a corresponding hole in the upper punch.

R.R.

ETach dem Entfernen des Preßlings aus dem Preßgesenk wird der Preßling ca. 1 Stunde lang bei einer Temperatur von etwa 350 0C unter Schutzgas, z. B. Stickstoff oder Stadtgas, einem Gemisch, das im wesentlichen aus Wasserstoff, Methan und Kohlenmonoxid besteht, gesintert. Nach dem Abkühlen liegt die fertige Kohlebürste mit der eingepreßten Anschlußlitze vor.ETACH removal of the compact from the press die, the compact is about 1 hour at a temperature of about 350 0 C under a protective gas, such. B. nitrogen or town gas, a mixture consisting essentially of hydrogen, methane and carbon monoxide, sintered. After cooling down, the finished carbon brush with the pressed-in pigtail is available.

Bei einer thermischen Alterung zwischen -20 und +210 0C zeigte der übergangswiderstand einer solchen Kohle, gemessen nach DIH IEC k6j vor der Alterung einen Wert 3 mJl» und nach einer Alterung von UOO Stunden einen Wert von k mJL . Demgegenüber zeigte eine entsprechende Bürste mit einem geraden eingepreßten Litzenende vor der Alterung einen Übergangswiderstand von 7 m»-ßj und nach der Alterung von UOO Stunden einen solchen von 13 mJL . Es war durchaus überraschend, daß eine solche verhältnismäßig einfache Maßnahme eine derartige Wirkung zeigt. In der Serienfertigung wird eine geeignete Biegevorrichtung direkt in die bereits vorhandene Litzen-Abschneidevorrichtung eingebaut, so daß in einer Arbeitsbewegung die Litze der fertig gepreßten Bürste abgeschnitten und gleichzeitig die nächste Litze umgebogen werden kann.In a thermal aging between -20 and +210 0 C, the contact resistance of such a coal, measured according to IEC DIH K6J before aging a value of 3 MJL "and after an aging of UOO hours a value of k MJL showed. In contrast, a corresponding brush with a straight, pressed-in strand end exhibited a transition resistance of 7 mJL before aging and a resistance of 13 mJL after aging for 100 hours. It was quite surprising that such a relatively simple measure shows such an effect. In series production, a suitable bending device is installed directly in the already existing strand cutting device, so that the strand of the finished pressed brush can be cut off in one working movement and the next strand can be bent over at the same time.

Claims (3)

• β*• β * * f> ■* f> ■ ■"·* · m ψ, ■ "· * · m ψ, R.19O91*
β.12.1983 Pf/Jä
R.19O9 1 *
β.12.1983 Pf / Jä
ROBERT BOSCH GMBH, TOOO Stuttgart 1
Ansprüche
ROBERT BOSCH GMBH, TOOO Stuttgart 1
Expectations
( 1 .,/Verfahren zur Senkung und Stabilisierung des Übergangswiderstandes zwischen einer Kohlebürste und einer Anschlußlitze, wobei ein Litzenende in die Ausgangspulvermischung eingetaucht und Pulver und Litze verdichtet werden, dadurch gekennzeichnet, daß das Litzenende vor dem Eintauchen in das Pulver umgebogen wird. ( 1., / Method for lowering and stabilizing the contact resistance between a carbon brush and a connecting wire, whereby one end of the wire is immersed in the starting powder mixture and the powder and wire are compacted, characterized in that the wire end is bent before being dipped into the powder.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Litzenende um 18O° umgebogen wird.2. The method according to claim 1, characterized in that that the strand end is bent by 180 °. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Länge des umgebogenen Endes der Litze etwa dem 0,5-fachen der Gesamteintauchlänge entspricht.3. The method according to claim 2, characterized in that the length of the bent end of the braid is approximately 0.5 times corresponds to the total immersion length.
DE19833344556 1983-12-09 1983-12-09 METHOD FOR REDUCING AND STABILIZING THE TRANSITION RESISTANCE BETWEEN A CHARCOAL BRUSH AND A CONNECTING LAMP Ceased DE3344556A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19833344556 DE3344556A1 (en) 1983-12-09 1983-12-09 METHOD FOR REDUCING AND STABILIZING THE TRANSITION RESISTANCE BETWEEN A CHARCOAL BRUSH AND A CONNECTING LAMP
EP84113666A EP0148367B1 (en) 1983-12-09 1984-11-13 Method for the diminution and stabilization of the transition resistance of a carbon brush and a connecting strand
DE8484113666T DE3465228D1 (en) 1983-12-09 1984-11-13 Method for the diminution and stabilization of the transition resistance of a carbon brush and a connecting strand

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833344556 DE3344556A1 (en) 1983-12-09 1983-12-09 METHOD FOR REDUCING AND STABILIZING THE TRANSITION RESISTANCE BETWEEN A CHARCOAL BRUSH AND A CONNECTING LAMP

Publications (1)

Publication Number Publication Date
DE3344556A1 true DE3344556A1 (en) 1985-06-20

Family

ID=6216487

Family Applications (2)

Application Number Title Priority Date Filing Date
DE19833344556 Ceased DE3344556A1 (en) 1983-12-09 1983-12-09 METHOD FOR REDUCING AND STABILIZING THE TRANSITION RESISTANCE BETWEEN A CHARCOAL BRUSH AND A CONNECTING LAMP
DE8484113666T Expired DE3465228D1 (en) 1983-12-09 1984-11-13 Method for the diminution and stabilization of the transition resistance of a carbon brush and a connecting strand

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE8484113666T Expired DE3465228D1 (en) 1983-12-09 1984-11-13 Method for the diminution and stabilization of the transition resistance of a carbon brush and a connecting strand

Country Status (2)

Country Link
EP (1) EP0148367B1 (en)
DE (2) DE3344556A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29610353U1 (en) * 1996-06-13 1996-08-22 Deutsche Carbone Ag, 60437 Frankfurt Carbon brush with a current arrester

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH63217A (en) * 1912-11-26 1914-01-16 Carbone Sa L Electrical connection device
US1089700A (en) * 1911-11-17 1914-03-10 Gen Electric Current-collector and process of making the same.
US1719963A (en) * 1926-03-29 1929-07-09 Albert C Henry Composite electrical brush or contact and method of producing same
DE1613384A1 (en) * 1966-12-28 1970-01-08 Lorraine Carbone Brush for electrical machines and processes for their manufacture
DE1613356A1 (en) * 1967-08-31 1971-04-15 Ringsdorff Werke Gmbh Carbon brushes for electrical machines with pressed-in cable and the method and device for their manufacture

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2654038A (en) * 1950-11-25 1953-09-29 Speer Carbon Company Molded-in shunt electrical contact member
US3076908A (en) * 1960-02-10 1963-02-05 Owens Illinois Glass Co Carbon to metal bonded assembly and method of making same
DE2701829A1 (en) * 1977-01-18 1978-07-20 Hoffmann Elektrokohle PRESSED CARBON BRUSH WITH AT LEAST ONE PRESSED-IN CABLE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1089700A (en) * 1911-11-17 1914-03-10 Gen Electric Current-collector and process of making the same.
CH63217A (en) * 1912-11-26 1914-01-16 Carbone Sa L Electrical connection device
US1719963A (en) * 1926-03-29 1929-07-09 Albert C Henry Composite electrical brush or contact and method of producing same
DE1613384A1 (en) * 1966-12-28 1970-01-08 Lorraine Carbone Brush for electrical machines and processes for their manufacture
DE1613356A1 (en) * 1967-08-31 1971-04-15 Ringsdorff Werke Gmbh Carbon brushes for electrical machines with pressed-in cable and the method and device for their manufacture

Also Published As

Publication number Publication date
EP0148367B1 (en) 1987-08-05
EP0148367A1 (en) 1985-07-17
DE3465228D1 (en) 1987-09-10

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