EP1444757B1 - Carbon brush - Google Patents

Carbon brush Download PDF

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Publication number
EP1444757B1
EP1444757B1 EP02781315A EP02781315A EP1444757B1 EP 1444757 B1 EP1444757 B1 EP 1444757B1 EP 02781315 A EP02781315 A EP 02781315A EP 02781315 A EP02781315 A EP 02781315A EP 1444757 B1 EP1444757 B1 EP 1444757B1
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EP
European Patent Office
Prior art keywords
carbon brush
spring
recess
disconnecting element
protective covering
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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.)
Expired - Lifetime
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EP02781315A
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German (de)
French (fr)
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EP1444757A1 (en
Inventor
Diethard Schunk Italia S.r.l. Schaut
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Schunk Kohlenstofftechnik GmbH
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Schunk Kohlenstofftechnik GmbH
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Publication of EP1444757A1 publication Critical patent/EP1444757A1/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
    • H01R39/59—Means structurally associated with the brushes for interrupting current

Definitions

  • the invention relates to a carbon brush with a arranged in a recess of this at least partially surrounded by a shutting Abschaltorgan comprising a spring preferably in carbon brush longitudinal direction biased from electrically insulating material existing pin as Abschaltnippel, wherein the sheath is fixed in the carbon brush, and optionally an electrically conductive strand.
  • shutdown devices are integrated in the carbon brushes.
  • the shutdown devices consist of a made of electrically insulating material pin or nipple, which is subjected to force by means of a helical compression spring in the direction of the tread of the carbon brush.
  • the helical compression spring can be supported on a separating plate, which is fixed in the carbon brush by means of stamping powder or by means of a transverse to the shut-off Isolierstifis.
  • the shut-off nipple is exposed, with the consequence that it is freely movable, that is, by supporting it on the commutator, the carbon brush lifts off from it.
  • a carbon brush with Abschaltnippel is z.
  • Abschaltorgan can be passed in the carbon brush current via a strand or a kraftbeier sodes in carbon brush direction of the commutator pressure element as pressure spring.
  • DE 74 04 456 U1 discloses a generic carbon brush with a shut-off. This includes a pressure piece that passes through a capsule. To avoid uncontrolled sliding out of the pressure piece, a constriction is provided in the capsule. For proper positioning of the Abschaltorgans the capsule must be introduced with the pressure piece in such a blind hole of the carbon brush that a present in the capsule spring on the pressure piece, which is supported on the carbon brush, is biased.
  • shut-off brush which has a screw-in the carbon brush sleeve in which a Abschaltnippel is arranged with these surrounding coil spring.
  • the shut-off nipple is constantly supported on the bottom wall of a blind hole, in which the sleeve is screwed.
  • the present invention is based on the problem, a carbon brush of the type mentioned in such a way that the Abschaltorgan is easily fixable in the carbon brush, the spring may have a desired bias, which is not to compensate during installation by separate tools. It should also be ensured that the forces caused by the spring do not exert any undue forces on the carbon brush when the shut-off device is fixed. Furthermore, a montagee Organic simplification when fixing the Abschaltorgans done in the carbon brush.
  • the problem is solved in that the shut-off member with pretensioned spring is surrounded on the pin-side by the sheath consisting of electrically insulating material in such a way that the sheath accommodates pretensioning of the spring.
  • a shrink film can also be used.
  • the shutdown member is supplied as a prefabricated component with biased spring element such as helical compression spring of the recess having carbon brush to be fixed in the former. It is not necessary to puncture the prefabricated component or fix its coil spring by means of a separating plate or a pin made of insulating material.
  • shut-off element is inserted and fixed in the recess as a prefabricated unit with preloaded spring with the sheathing surrounding it at least partially.
  • the envelope is perforated switching nipple side.
  • the envelope may also have a smaller material thickness than the spring side of the switching nipple side.
  • the unit switching nipple spring is used as a unit so that the spring is biased to the extent required relative to the nipple without a separate support of the spring in the carbon brush is required.
  • the nipple can enforce the enclosure with the result that the nipple is supported on the one hand on the commutator and on the other hand, the spring lifts the carbon brush from the commutator.
  • the invention is therefore also distinguished by a method for equipping a carbon brush with a shut-off element to be inserted in a recess comprising a pin, such as a shut-off nipple, which is prestressed by a spring and which is secured in the carbon brush Abschaltorgan with prestressed spring in the existing of electrically insulating material, the bias of the spring receiving sheath is arranged and introduced as a prefabricated part in the recess and fixed in this.
  • FIG. 1 a detail of a carbon brush 10 is shown, which is intended in particular for small machines such as power tools or garden pumps or home appliances or washing machine motors, ie for motors in general, in which a Mehrfachbestükkung should take place, but without thereby limiting the teaching of the invention ,
  • the teaching of the invention also applies to carbon brushes, in which the current is passed through a pressure spring, not shown, via which the carbon brush is subjected to force in the direction of a commutator to abut against this.
  • shut-off member 20 comprises an insulating pin made of electrically insulating material or equivalent element as Abschaltnippel 22, which is in the carbon brush 10 under the action of a highly biased spring 24 such as helical compression spring.
  • the unit thus formed is in the recess 18 by z. B. adhesive 28 fixed.
  • the bias of the spring 24 is received by the sheath 26, so that a load of the carbon brush 10 does not occur. Also, it is not necessary that the shut-off member 20 is pulped in the recess 18, as is the case in the prior art.
  • the enclosure 26 surrounds the shut-off member 20 with the Abschaltnippel 22 and the spring 24 such that the spring 24 is received in the prestressed state. It is not absolutely necessary that a sheath 26 completely surrounds the shut-off element 20.
  • the carbon brush 10 has reached its wear limit, the commutator-side region of the switching nipple 22 is exposed both by the carbon brush 10 and by the casing 26, so that the cut-off nipple 22 can be placed on the commutator.
  • the bias of the spring 24 may degrade, with the result that the carbon brush 10 is lifted from the commutator. A brush fire is thereby prevented, so that the commutator can not be roughened by brush fire or out of round.
  • the sheath 26 is made of electrically insulating material and may be formed as a kind of shrink film, in which the shut-off member 20 is arranged with the Abschaltnippel 22 and the biased spring 24.
  • the unit thus formed can be inserted into the recess 18 and mentioned z. B. be fixed by adhesive or other suitable measures.
  • shut-off member 22 is supplied in the prestressed state, there is a simplification of the assembly of carbon brushes, which are to be formedsabschallend.

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  • Motor Or Generator Current Collectors (AREA)

Abstract

The invention relates to a carbon brush (10) with a disconnecting element (20) arranged in a recess (18).Said disconnecting element comprises a disconnection fitting which is pre-tensed by means of a spring and made of an electrically insulating material. In order to easily arrange the disconnecting element in the carbon brush with the desired spring pre-tensing, the disconnecting element (20) with the pre-tensed spring (24) is surrounded by a covering (26) made of an electrically insulating material, said covering being fixed in the recess (18) of the carbon brush (10).

Description

Die Erfindung bezieht sich auf eine Kohlebürste mit einem in einer Ausnehmung dieser angeordneten zumindest teilweise von einer Umhüllung umgebenen Abschaltorgan umfassend einen über eine Feder vorzugsweise in Kohlebürstenlängsrichtung vorgespannten aus elektrisch isolierendem Material bestehenden Stift wie Abschaltnippel, wobei die Umhüllung in der Kohlebürste befestigt ist, sowie gegebenenfalls einer stromleitenden Litze.The invention relates to a carbon brush with a arranged in a recess of this at least partially surrounded by a shutting Abschaltorgan comprising a spring preferably in carbon brush longitudinal direction biased from electrically insulating material existing pin as Abschaltnippel, wherein the sheath is fixed in the carbon brush, and optionally an electrically conductive strand.

Insbesondere bei Kleinmaschinen wie Elektrowerkzeugen oder gewerblichen Hausgeräten ist es erforderlich, mehrere Kohlebürstenbestückungen hintereinander ohne Kommutator-Nacharbeit abzufahren. Damit die nach Ablauf der Erstbestückung folgenden Ersatzbestückungen ausreichende Standzeiten erzielen, muss der Kommutator ausreichend rund und frei von stärkeren Anfleckungen sein. Dies ist nur dann möglich, wenn die jeweiligen zum Einsatz gelangenden Kohlebürsten bei Erreichen ihrer Verschleißgrenze nicht den Kommutator durch zunehmendes Bürstenfeuer unzulässig stark aufrauhen bzw. unrund feuern. Es muss außerdem vermieden werden, dass eine Litze bzw. ein Stampfkontakt mit dem Kommutator in Berührung gelangt, der andernfalls beschädigt werden würde.Especially with small machines such as power tools or commercial home appliances, it is necessary to run several carbon brushes consecutively without commutator rework. In order for the replacement equations following the initial assembly to achieve sufficient service life, the commutator must be sufficiently round and free from stronger stains. This is only possible if the respective carbon brushes used do not roughen the commutator by excessive brush fire when reaching their wear limit, or fire it out of round. It must also be avoided that a strand or tamping contact with the commutator comes into contact, which would otherwise be damaged.

Um dies zu erreichen, werden in den Kohlebürsten Abschaltvorrichtungen integriert. Die Abschaltvorrichtungen bestehen dabei aus einem aus elektrisch isolierendem Material bestehenden Stift oder Nippel, der mittels einer Schraubendruckfeder in Richtung der Lauffläche der Kohlebürste kraftbeaufschlagt ist. Die Schraubendruckfeder kann sich auf ein Trennplättchen abstützen, das in der Kohlebürste mittels Einstampfpulver oder mittels eines quer zu der Abschaltvorrichtung verlaufenden Isolierstifis fixiert ist.To achieve this, shutdown devices are integrated in the carbon brushes. The shutdown devices consist of a made of electrically insulating material pin or nipple, which is subjected to force by means of a helical compression spring in the direction of the tread of the carbon brush. The helical compression spring can be supported on a separating plate, which is fixed in the carbon brush by means of stamping powder or by means of a transverse to the shut-off Isolierstifis.

Erreicht die Kohlebürste ihre Verschleißgrenze, so ist der Abschaltnippel freigelegt mit der Folge, dass dieser frei beweglich ist, also durch Abstützen auf dem Kommutator die Kohlebürste von diesem abhebt.If the carbon brush reaches its wear limit, the shut-off nipple is exposed, with the consequence that it is freely movable, that is, by supporting it on the commutator, the carbon brush lifts off from it.

Aufgrund der erforderlichen hohen Vorspannung durch die Schraubendruckfeder muss das Einstampfpulver bzw. der Isollerstift erhebliche Kräfte kompensieren, so dass die Kohlebürste beim Fixieren des Abschaltorgans die Kohlebürste zerbrechen kann. Auch sind montagemäßig Nachteile gegeben, da die Schraubenfeder vorgespannt werden muss.Due to the required high bias voltage by the helical compression spring the stamping powder or the Isollerstift must compensate for significant forces, so that the carbon brush can break the carbon brush when fixing the Abschaltorgans. Also montagemäßig are given disadvantages, since the coil spring must be biased.

Eine Kohlebürste mit Abschaltnippel ist z. B. der EP 0 512 234 A2 oder der DE 28 04 547 A1 zu entnehmen.A carbon brush with Abschaltnippel is z. Example, the EP 0 512 234 A2 or DE 28 04 547 A1.

Unabhängig von dem Abschaltorgan kann bei der Kohlebürste Strom über eine Litze oder über eine in Kohlebürstenrichtung des Kommutators kraftbeaufschlagendes Andruckelement wie Andruckfeder geleitet werden.Regardless of the Abschaltorgan can be passed in the carbon brush current via a strand or a kraftbeaufschlagendes in carbon brush direction of the commutator pressure element as pressure spring.

Dem DE 74 04 456 U1 ist eine gattungsbildende Kohlebürste mit einem Abschaltorgan zu entnehmen. Dieses umfasst ein Druckstück, das eine Kapsel durchsetzt. Um ein unkontrolliertes Herausgleiten des Druckstückes zu vermeiden, ist eine Verengung in der Kapsel vorgesehen. Zum ordnungsgemäßen Positionieren des Abschaltorgans muss die Kapsel mit dem Druckstück derart in ein Sackloch der Kohlebürste eingebracht werden, dass eine in der Kapsel vorhandene Feder über das Druckstück, das sich an der Kohlebürste abstützt, vorgespannt wird.DE 74 04 456 U1 discloses a generic carbon brush with a shut-off. This includes a pressure piece that passes through a capsule. To avoid uncontrolled sliding out of the pressure piece, a constriction is provided in the capsule. For proper positioning of the Abschaltorgans the capsule must be introduced with the pressure piece in such a blind hole of the carbon brush that a present in the capsule spring on the pressure piece, which is supported on the carbon brush, is biased.

Aus der DE 30 47 421 A1 ist eine Abschaltbürste bekannt, die eine in die Kohlebürste einschraubbare Hülse aufweist, in der ein Abschaltnippel mit diesen umgebender Schraubenfeder angeordnet ist. Der Abschaltnippel stützt sich fortwährend an der Bodenwandung eines Sackloches ab, in das die Hülse eingeschraubt ist.From DE 30 47 421 A1 a shut-off brush is known, which has a screw-in the carbon brush sleeve in which a Abschaltnippel is arranged with these surrounding coil spring. The shut-off nipple is constantly supported on the bottom wall of a blind hole, in which the sleeve is screwed.

Der vorliegenden Erfindung liegt das Problem zu Grunde, eine Kohlebürste der eingangs genannten Art so weiterzubilden, dass das Abschaltorgan problemlos in der Kohlebürste fixierbar ist, wobei die Feder eine gewünschte Vorspannung aufweisen kann, die während der Montage durch gesonderte Werkzeuge nicht zu kompensieren ist. Auch soll sichergestellt sein, dass die von der Feder hervorgerufenen Kräfte bei fixiertem Abschaltorgan keine unzulässigen Kräfte auf die Kohlebürste ausüben. Ferner soll eine montagemäßige Vereinfachung beim Fixieren des Abschaltorgans in der Kohlebürste erfolgen.The present invention is based on the problem, a carbon brush of the type mentioned in such a way that the Abschaltorgan is easily fixable in the carbon brush, the spring may have a desired bias, which is not to compensate during installation by separate tools. It should also be ensured that the forces caused by the spring do not exert any undue forces on the carbon brush when the shut-off device is fixed. Furthermore, a montageemäßige simplification when fixing the Abschaltorgans done in the carbon brush.

Erfindungsgemäß wird das Problem dadurch gelöst, dass das Abschaltorgan mit vorgespannter Feder von der aus elektrisch isolierendem Material bestehenden Umhüllung stiftseitig derart umgeben ist, dass die Umhüllung Vorspannung der Feder aufnimmt.According to the invention, the problem is solved in that the shut-off member with pretensioned spring is surrounded on the pin-side by the sheath consisting of electrically insulating material in such a way that the sheath accommodates pretensioning of the spring.

Als Umhüllung kann auch eine Schrumpffolie benutzt werden.As wrapping, a shrink film can also be used.

Erfindungsgemäß wird das Abschaltorgan als konfektioniertes Bauteil mit vorgespanntem Federelement wie Schraubendruckfeder der die Ausnehmung aufweisenden Kohlebürste zugeführt, um in ersterer fixiert zu werden. Ein Einstampfen des konfektionierten Bauteils bzw. ein Fixieren dessen Schraubenfeder durch ein Trennplättchen oder einen aus isolierendem Material bestehenden Stift ist nicht erforderlich.According to the shutdown member is supplied as a prefabricated component with biased spring element such as helical compression spring of the recess having carbon brush to be fixed in the former. It is not necessary to puncture the prefabricated component or fix its coil spring by means of a separating plate or a pin made of insulating material.

Mit anderen Worten wird vorgeschlagen, dass das Abschaltorgan mit der dieses zumindest bereichsweise umgebenden Umhüllung als vorgefertigte Einheit mit vorgespannter Feder in die Ausnehmung eingesetzt und fixiert ist.In other words, it is proposed that the shut-off element is inserted and fixed in the recess as a prefabricated unit with preloaded spring with the sheathing surrounding it at least partially.

Um ein sicheres Abheben der Kohlebürste bei Erreichen deren Verschleißgrenze sicherzustellen, sieht eine Weiterbildung der Erfindung vor, dass die Umhüllung schaltnippelseitig perforiert ist. Alternativ oder ergänzend kann die Umhüllung auch schaltnippelseitig eine geringere Materialstärke als federseitig aufweisen.In order to ensure a safe lifting of the carbon brush when it reaches its wear limit, a development of the invention provides that the envelope is perforated switching nipple side. Alternatively or additionally, the envelope may also have a smaller material thickness than the spring side of the switching nipple side.

Durch diese Maßnahmen ist sichergestellt, dass einerseits die Baueinheit Schaltnippel-Feder derart als Einheit verwendbar ist, dass die Feder im erforderlichen Umfang gegenüber dem Schaltnippel vorgespannt ist, ohne dass eine gesonderte Abstützung der Feder in der Kohlebürste erforderlich ist. Gleichzeitig ist sichergestellt, dass dann, wenn die Schaltorganeinheit durch Abnutzung der Kohlebürste freigelegt ist, der Schaltnippel die Umhüllung mit der Folge durchsetzen kann, dass sich der Schaltnippel einerseits auf dem Kommutator abstützt und andererseits die Feder die Kohlebürste von dem Kommutator abhebt.By these measures it is ensured that on the one hand, the unit switching nipple spring is used as a unit so that the spring is biased to the extent required relative to the nipple without a separate support of the spring in the carbon brush is required. At the same time it is ensured that when the switching device unit is exposed by wear of the carbon brush, the nipple can enforce the enclosure with the result that the nipple is supported on the one hand on the commutator and on the other hand, the spring lifts the carbon brush from the commutator.

Als besondere Vorteile der Erfindung sind hervorzuheben die einfache Montage, da ein Montageautomat, der mit hohen Kosten verbunden ist, nicht erforderlich ist. Vielmehr genügt eine einfache Bohrvorrichtung. Auch kann ein Einsetzen des konfektionierten Bauteils ortsunabhängig erfolgen. Die Fertigung kann ohne großen Aufwand vorgenommen bzw. verlagert werden.As a particular advantages of the invention are emphasized the ease of installation, as an assembly machine, which is associated with high costs, is not required. Rather, a simple drilling device is sufficient. Also, an insertion of the assembled component can be carried out location-independent. The production can be made or relocated without much effort.

Daher zeichnet sich die Erfindung auch durch ein Verfahren zum Bestücken einer Kohlebürste mit einem in einer Ausnehmung dieser einzubringenden Abschaltorgan umfassend einen über eine Feder vorgespannten aus elektrisch isolierendem Material bestehenden Stift wie Abschaltnippel, wobei die Umhüllung in der Kohlebürste befestigt wird, dadurch aus, dass das Abschaltorgan mit vorgespannter Feder in der aus elektrisch isolierendem Material bestehenden die Vorspannung der Feder aufnehmenden Umhüllung angeordnet wird und als konfektioniertes Teil in die Aussparung eingebracht und in dieser fixiert wird.The invention is therefore also distinguished by a method for equipping a carbon brush with a shut-off element to be inserted in a recess comprising a pin, such as a shut-off nipple, which is prestressed by a spring and which is secured in the carbon brush Abschaltorgan with prestressed spring in the existing of electrically insulating material, the bias of the spring receiving sheath is arranged and introduced as a prefabricated part in the recess and fixed in this.

Weitere Einzelheiten, Vorteile und Merkmale der Erfindung ergeben sich nicht nur aus den Ansprüchen, den diesen zu entnehmenden Merkmalen - für sich/oder in Kombination -, sondern auch aus der nachfolgenden Beschreibung eines der Zeichnung zu entnehmenden bevorzugten Ausführungsbeispiels.For more details, advantages and features of the invention will become apparent not only from the claims, the features to be taken these - by itself or in combination - but also from the following description of a drawing to be taken preferred embodiment.

In der einzigen Figur ist ein Ausschnitt einer Kohlebürste 10 dargestellt, die insbesondere für Kleinmaschinen wie Elektrowerkzeuge oder Gartenpumpen oder Hausgeräte oder Waschmaschinen-Motoren bestimmt ist, also für Motoren allgemein, bei denen eine Mehrfachbestükkung erfolgen soll, ohne dass jedoch hierdurch die erfindungsgemäße Lehre eingeschränkt wird. Gleiches gilt in Bezug auf die prinzipiell dargestellte stromführende Litze 12, die in einer Ausnehmung mittels Einstampfpulver 14 fixiert ist. Selbstverständlich gilt die erfindungsgemäße Lehre auch für Kohlebürsten, bei denen der Strom über eine nicht dargestellte Andruckfeder geleitet wird, über die die Kohlebürste in Richtung eines Kommutators kraftbeaufschlagt wird, um an diesem anzuliegen.In the single FIGURE, a detail of a carbon brush 10 is shown, which is intended in particular for small machines such as power tools or garden pumps or home appliances or washing machine motors, ie for motors in general, in which a Mehrfachbestükkung should take place, but without thereby limiting the teaching of the invention , The same applies with respect to the current-carrying strand 12 shown in principle, which is fixed in a recess by means of stamping powder 14. Of course, the teaching of the invention also applies to carbon brushes, in which the current is passed through a pressure spring, not shown, via which the carbon brush is subjected to force in the direction of a commutator to abut against this.

Unabhängig von dem Einsatzgebiet der Kohlebürste 10 und dessen Stromführung ist jedoch eine vorzugsweise entlang der Bürstenlängsachse 16 verlaufende Ausnehmung 18 vorgesehen, in der ein Abschaltorgan 20 angeordnet ist. Das Abschaltorgan 20 umfasst ein aus elektrisch isolierendem Material bestehenden Isolierstift oder gleichwirkendes Element wie Abschaltnippel 22, der in der Kohlebürste 10 unter Einwirkung einer stark vorgespannten Feder 24 wie Schraubendruckfeder steht.Regardless of the field of application of the carbon brush 10 and its current flow, however, a preferably extending along the brush longitudinal axis 16 recess 18 is provided, in which a shut-off device 20 is arranged. The shut-off member 20 comprises an insulating pin made of electrically insulating material or equivalent element as Abschaltnippel 22, which is in the carbon brush 10 under the action of a highly biased spring 24 such as helical compression spring.

Das Abschaltorgan 20 mit dem Abschaltnippel 22 und der Feder 24 ist erfindungsgemäß von einer Umhüllung 26 umgeben. Die so gebildete Einheit ist in der Aussparung 18 durch z. B. Klebstoff 28 fixiert. Die Vorspannung der Feder 24 wird von der Umhüllung 26 aufgenommen, so dass eine Belastung der Kohlebürste 10 nicht erfolgt. Auch ist es nicht erforderlich, dass das Abschaltorgan 20 in der Ausnehmung 18 eingestampft ist, wie dies nach dem Stand der Technik der Fall ist.The shut-off member 20 with the Abschaltnippel 22 and the spring 24 according to the invention of surrounded by a wrapper 26. The unit thus formed is in the recess 18 by z. B. adhesive 28 fixed. The bias of the spring 24 is received by the sheath 26, so that a load of the carbon brush 10 does not occur. Also, it is not necessary that the shut-off member 20 is pulped in the recess 18, as is the case in the prior art.

Die Umhüllung 26 umgibt das Abschaltorgan 20 mit dem Abschaltnippel 22 und der Feder 24 derart, dass die Feder 24 im vorgespannten Zustand aufgenommen ist. Dabei ist es nicht zwingend erforderlich, dass eine Umhüllung 26 das Abschaltorgan 20 vollumfänglich umgibt.The enclosure 26 surrounds the shut-off member 20 with the Abschaltnippel 22 and the spring 24 such that the spring 24 is received in the prestressed state. It is not absolutely necessary that a sheath 26 completely surrounds the shut-off element 20.

Hat die Kohlebürste 10 ihre Verschleißgrenze erreicht, so ist der kommutatorseitige Bereich des Schaltnipppels 22 sowohl von der Kohlebürste 10 als auch von der Umhüllung 26 freigelegt, so dass sich der Abschaltnippel 22 auf dem Kommutator auflegen kann. Gleichzeitig kann sich die Vorspannung der Feder 24 mit der Folge abbauen, dass die Kohlebürste 10 von dem Kommutator abgehoben wird. Ein Bürstenfeuer wird hierdurch unterbunden, so dass der Kommutator durch Bürstenfeuer nicht aufgerauht bzw. unrund werden kann.If the carbon brush 10 has reached its wear limit, the commutator-side region of the switching nipple 22 is exposed both by the carbon brush 10 and by the casing 26, so that the cut-off nipple 22 can be placed on the commutator. At the same time, the bias of the spring 24 may degrade, with the result that the carbon brush 10 is lifted from the commutator. A brush fire is thereby prevented, so that the commutator can not be roughened by brush fire or out of round.

Die Umhüllung 26 besteht aus elektrisch isolierendem Material und kann quasi als Schrumpffolie ausgebildet sein, in der das Abschaltorgan 20 mit dem Abschaltnippel 22 und der vorgespannten Feder 24 angeordnet ist. Die so gebildete Einheit kann in die Ausnehmung 18 eingesetzt und erwähntermaßen z. B. durch Klebstoff oder andere geeignete Maßnahmen fixiert werden.The sheath 26 is made of electrically insulating material and may be formed as a kind of shrink film, in which the shut-off member 20 is arranged with the Abschaltnippel 22 and the biased spring 24. The unit thus formed can be inserted into the recess 18 and mentioned z. B. be fixed by adhesive or other suitable measures.

Dadurch, dass das Abschaltorgan 22 im vorgespannten Zustand geliefert wird, erfolgt eine Vereinfachung der Bestückung von Kohlebürsten, die selbstabschallend ausgebildet werden sollen.Characterized in that the shut-off member 22 is supplied in the prestressed state, there is a simplification of the assembly of carbon brushes, which are to be formed selbstabschallend.

Um ein sicheres Freigeben des Abschaltnippels 22 bei Erreichen der Verschleißgrenze der Kohlebürste 10 sicherzustellen, kann die Umhüllung 26 im laufflächigen Bereich 30 z. B. perforiert sein oder eine geringere Materialstärke als im Umfangsbereich bzw. im Bereich der Feder 24 aufweisen.In order to ensure a safe release of the Abschaltnippels 22 when reaching the wear limit of the carbon brush 10, the sheath 26 in the tuber area 30 z. B. perforated or have a lower material thickness than in the peripheral region or in the region of the spring 24.

Claims (10)

  1. Carbon brush (10) having a disconnecting element (20), which is disposed in a recess (18) of said carbon brush and is at least partially surrounded by a protective covering, said disconnecting element comprising a pin such as a disconnecting nipple, which is pre-tensioned via a spring (24) preferably in the longitudinal direction of the carbon brush and is produced from electrically insulating material, wherein the protective covering (26) is secured in the carbon brush, and where applicable comprising an electrically conductive shunt (12), characterised in that the disconnecting element (20) with pre-tensioned spring (24) is surrounded on the side of the pin by the protective covering, which is produced from electrically insulating material, in such a manner that the protective covering absorbs the pre-tensioning of the spring.
  2. Carbon brush according to claim 1, characterised in that the protective covering (26) is produced from plastics material.
  3. Carbon brush according to claim 1 or 2, characterised in that the protective covering (26) is glued in place in the recess (18) of the carbon brush.
  4. Carbon brush according to at least one of the preceding claims, characterised in that the protective coating (26) is welded around the disconnecting element (20).
  5. Carbon brush according to at least one of the preceding claims, characterised in that the protective coating (26) is perforated on the running surface side of the carbon brush.
  6. Carbon brush according to at least one of the preceding claims, characterised in that the material thickness of the protective covering (26) is thinner on the running surface side of the carbon brush than on the spring side.
  7. Carbon brush according to at least one of the preceding claims, characterised in that the disconnecting element (20) is shrunk in a film.
  8. Carbon brush according to at least one of the preceding claims, characterised in that the disconnecting element (20) with the protective covering (26), which surrounds said disconnecting element at least in regions, is inserted into the recess (18) as a prefabricated unit with a pretensioned spring (24) and is secured.
  9. Method for fitting a carbon brush (10) with a disconnecting element (20), which is to be inserted in a recess (18) of said carbon brush, said disconnecting element comprising a pin such as a disconnecting nipple (22), which is pre-tensioned via a spring (24) and is produced from electrically insulating material, wherein the protective covering is secured in the carbon brush, characterised in that the disconnecting element (20) with pretensioned spring (24) is disposed in the protective covering (26), which is produced from electrically insulating material and absorbs the pre-tensioning of the spring, and is inserted into the recess (18) as a ready-made part and is secured therein.
  10. Method according to claim 9, characterised in that the protective coating (26) is glued into place in the recess.
EP02781315A 2001-11-15 2002-11-13 Carbon brush Expired - Lifetime EP1444757B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10155991A DE10155991C2 (en) 2001-11-15 2001-11-15 carbon brush
DE10155991 2001-11-15
PCT/EP2002/012688 WO2003043142A1 (en) 2001-11-15 2002-11-13 Carbon brush

Publications (2)

Publication Number Publication Date
EP1444757A1 EP1444757A1 (en) 2004-08-11
EP1444757B1 true EP1444757B1 (en) 2006-02-01

Family

ID=7705764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02781315A Expired - Lifetime EP1444757B1 (en) 2001-11-15 2002-11-13 Carbon brush

Country Status (5)

Country Link
EP (1) EP1444757B1 (en)
CN (1) CN1586027A (en)
AT (1) ATE317161T1 (en)
DE (2) DE10155991C2 (en)
WO (1) WO2003043142A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005063170B4 (en) * 2005-12-30 2011-12-08 Schunk Kohlenstofftechnik Gmbh Method for equipping a carbon brush with a shutdown device
DE102008012963A1 (en) * 2008-03-06 2009-09-17 Schunk Kohlenstofftechnik Gmbh Method for producing a contact unit and contact unit
DE102010042804A1 (en) 2010-10-22 2012-04-26 Robert Bosch Gmbh Carbon brush with shut-off device
CN103427284A (en) * 2012-05-14 2013-12-04 海门市海菱碳业有限公司 Safety carbon brush for electric polisher
CN103427275A (en) * 2012-05-17 2013-12-04 海门市海菱碳业有限公司 Safety carbon brush of starting motor of automobile
CN103427301A (en) * 2012-05-18 2013-12-04 海门市华联电碳有限公司 Carbon brush for safe electric hammer
CN103427280A (en) * 2012-05-18 2013-12-04 海门市海菱碳业有限公司 Carbon brush for automatic-stop type angle polishing machine
CN102904146A (en) * 2012-10-26 2013-01-30 海门市通达碳业有限公司 Assembling method of electric brush assembly
DE102021107839A1 (en) * 2021-03-29 2022-09-29 Metabowerke Gmbh Layered carbon brush for an electric motor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2227658B1 (en) * 1973-04-26 1976-09-10 Lorraine Carbone
DE2804547A1 (en) * 1978-02-03 1979-08-09 Licentia Gmbh Carbon brush for commutator motor - has insulated signalling contact embedded in it to form closed circuit when brush needs changing
DE3047421A1 (en) * 1980-12-17 1982-07-15 Ringsdorff-Werke GmbH, 5300 Bonn SHUTDOWN BRUSH
DE4111206A1 (en) * 1991-04-06 1992-10-08 Schunk Kohlenstofftechnik Gmbh COAL BRUSH

Also Published As

Publication number Publication date
DE50205764D1 (en) 2006-04-13
DE10155991A1 (en) 2003-06-05
CN1586027A (en) 2005-02-23
EP1444757A1 (en) 2004-08-11
DE10155991C2 (en) 2003-12-24
WO2003043142A1 (en) 2003-05-22
ATE317161T1 (en) 2006-02-15

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