EP0801825A1 - Carbon brush - Google Patents

Carbon brush

Info

Publication number
EP0801825A1
EP0801825A1 EP96900555A EP96900555A EP0801825A1 EP 0801825 A1 EP0801825 A1 EP 0801825A1 EP 96900555 A EP96900555 A EP 96900555A EP 96900555 A EP96900555 A EP 96900555A EP 0801825 A1 EP0801825 A1 EP 0801825A1
Authority
EP
European Patent Office
Prior art keywords
carbon brush
collector
brush
brush according
contact surface
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
EP96900555A
Other languages
German (de)
French (fr)
Other versions
EP0801825B1 (en
Inventor
Rainer Bruhn
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.)
ITT Automotive Europe GmbH
Continental Teves AG and Co oHG
Original Assignee
ITT Automotive Europe GmbH
Alfred Teves 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7750926&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0801825(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ITT Automotive Europe GmbH, Alfred Teves GmbH filed Critical ITT Automotive Europe GmbH
Publication of EP0801825A1 publication Critical patent/EP0801825A1/en
Application granted granted Critical
Publication of EP0801825B1 publication Critical patent/EP0801825B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/26—Solid sliding contacts, e.g. carbon brush

Definitions

  • the invention relates to a carbon brush for an electrical machine, which has an end face that can be brought into contact with a collector.
  • the contact surface itself is curved according to the cylindrical surface of the collector.
  • the inclination of the contact surface in relation to the lateral surface of the collector is in the order of 6 to 10 degrees, preferably approximately 8 degrees.
  • the inclination to be set depends, among other things. also depends on which electrical currents are to be transmitted through the brush.
  • the inclination can be selected the smaller the higher the electrical currents to be transmitted.
  • Figures la, 1b, 1c show a carbon brush in different views
  • the carbon brush 1 shown consists of an elongated cuboid, which is approximately square in cross section (FIG. 1b) and approximately rectangular in longitudinal section (FIG. 1 a).
  • Such a carbon brush is provided with a strand 2, via which the current is supplied.
  • the brushes are guided in quivers which are arranged on a brush support plate.
  • a cylindrical collector is provided, the contact surface of the collector being arranged on its outer surface.
  • the contact surface 3 of the brush 1 comes into contact with the outer surface / contact surface of the collector 4.
  • the contact surface 3 of the brush 1 is now designed as follows: in the transverse direction, that is to say in the circumferential direction of the collector, the contact surface 3 is curved, as can be seen in FIG. 1c.
  • the curvature essentially corresponds to the radius of the collector 4.
  • the contact surface 3 is inclined to the outer surface of the collector 4.
  • a wedge-shaped gap 5 is thus formed between the lateral surface of the collector 4 and the contact surface 3 of the brush 1.
  • the lower edge 6, that is the edge which lies against the outer surface of the collector 4 is provided with one or more grooves 10, 11, 12 which extend in the transverse direction over the entire width of the contact surface 3.
  • the brush is preferably positioned in the holder so that the lower edge 6 is close to the brush support plate. However, it is also possible to position the brush in such a way that the lower edge is at a distance from the brush support plate.
  • the grooves 10, 11, 12 are acute-angled, that is to say they have a triangular profile in cross section.
  • the bottom groove 10 is open at the bottom, that is to say there is only a bevel opposite the underside 13 of the brush 1.
  • the brushes are made as follows.
  • Blanks are pressed and sintered from a mixture that essentially contains graphite.
  • the layer on the long sides of the brush can also be removed in this way.
  • the end face 3 is then beveled, as described above, the corresponding curvature in the circumferential direction being achieved by the choice of the tool. Then one or more grooves are milled in the transverse direction on the lower edge.
  • the motor can be operated with very little noise.
  • the protruding edges 14, 15 are often ground off during test runs of the engine. That is to say the brush contains, starting from the lower edge, a shape which is adapted to the outer surfaces of the collector.
  • the contact surface 3 should enclose an angle of approximately 6 to 10 degrees to the lateral surface of the collector.

Landscapes

  • Motor Or Generator Current Collectors (AREA)

Abstract

The description relates to a carbon brush for an electric motor. Such carbon brushes must meet two requirements. Firstly, they must be as abrasion-resistant as possible and secondly as little noise as possible must be generated at the brush-collector interface with the motor running. To this end it is proposed that the face (3) of the carbon bursh (1) be sloped and have transverse grooves (10, 11, 12) in the lower region.

Description

KohlebürsteCarbon brush
Die Erfindung bezieht sich auf eine Kohlebürste für eine elektrische Maschine, die eine Stirnfläche aufweist, die zur Anlage an einen Kollektor gebracht werden kann.The invention relates to a carbon brush for an electrical machine, which has an end face that can be brought into contact with a collector.
Derartige Bürsten sind schon vielfach beschrieben worden. Ein Beispiel kann der DE 31 48 996 entnommen werden.Such brushes have been described many times. An example can be found in DE 31 48 996.
Das Problem, daß bei der Konstruktion derartiger Bürsten beachtet werden muß, besteht darin, daß die Einheit aus Bürste und Kollektor während des Betriebs Geräusche ver¬ ursacht. Die Kontaktfläche der Bürste gleitet an der Ober¬ fläche des Kollektors entlang, wodurch insbesondere durch die lamellenartige Struktur der Oberfläche des Kollektors Schwingungen induziert werden, die letztlich als Luft¬ schall abgegeben und als Geräusch wahrgenommen werden. Es sind schon vielfach Vorschläge gemacht worden, um diese Geräuschbelastung zu reduzieren. Bei jedem neuen Vorschlag ist als Randbedingung zu beachten, daß der Übergangswider¬ stand zwischen Bürste und Kollektor nicht zu klein werden darf. Außerdem soll die Bürste eine ausreichende Abrieb¬ festigkeit aufweisen, darf also nicht zu weich gestaltet werden.The problem that must be observed when designing such brushes is that the brush and collector unit causes noise during operation. The contact surface of the brush slides along the surface of the collector, which in particular induces vibrations due to the lamella-like structure of the surface of the collector, which vibrations are ultimately emitted as airborne sound and are perceived as noise. There have been many proposals to reduce this noise pollution. With every new proposal it is important to note that the contact resistance between the brush and the collector must not be too small. In addition, the brush should have sufficient abrasion resistance and should not be made too soft.
So wurde zum Beispiel schon vorgeschlagen, die Kontakt¬ fläche gegenüber der Achse des Kollektors bzw. gegenüber der Mantelfläche des Kollektors zu neigen. Die Kontakt¬ fläche wird dazu entsprechend angeschrägt. Dabei entsteht aber ein scharfkantiger Übergang zwischen der Kontaktflä¬ che und der unteren Seitenkante der Bürste, so daß zumin¬ dest in der Anfangsphase des Betriebs des Motors die Bür¬ ste lediglich mit einer Kante an dem Kollektor anliegt.For example, it has already been proposed to incline the contact surface with respect to the axis of the collector or with respect to the outer surface of the collector. The contact surface is bevelled accordingly. In this case, however, there is a sharp-edged transition between the contact surface and the lower side edge of the brush, so that at least in the initial phase of the operation of the motor, the brush only rests with one edge on the collector.
ORIGINAL UNTERLAGEN Bei diesen Bürsten wird im allgemeinen darauf verzichtet, die beim Pressen der Graphitmischung entstehende harte Oberfläche zu entfernen. In diesem Fall ist die erzielbare Geräuschreduzierung nur gering. Wird die Oberflächenhaut der Bürste nach dem Pressen entfernt, besteht die Gefahr, daß die Kante abbricht.ORIGINAL DOCUMENTS These brushes generally do not remove the hard surface that arises when the graphite mixture is pressed. In this case, the noise reduction that can be achieved is only slight. If the surface skin of the brush is removed after pressing, there is a risk of the edge breaking off.
Es ist weiterhin bekannt, die Kontaktfläche der Bürste über die gesamte Fläche mit Längsrillen zu versehen, die sich in Querrichtung, das heißt in Umfangsrichtung des Kollektors erstrecken. Diese Maßnahme führt aber nur zu einer geringen Abnahme des Geräuschpegels.It is also known to provide the contact surface of the brush with longitudinal grooves over the entire surface, which extend in the transverse direction, that is to say in the circumferential direction of the collector. However, this measure only leads to a slight decrease in the noise level.
Es wird daher gemäß der Erfindung vorgeschlagen, die Kon¬ taktfläche in Bezug auf die Axialrichtung des Kollektors zu neigen und lediglich im unteren Bereich mit einer oder mehreren Rillen in Querrichtung zu versehen, die in die Oberfläche eingefräst werden, dabei wird gleichzeitig die harte Oberflächenhaut entfernt.It is therefore proposed according to the invention to incline the contact surface with respect to the axial direction of the collector and to provide it only in the lower region with one or more transverse grooves which are milled into the surface, at the same time the hard surface skin is removed .
Es hat sich herausgestellt, daß zwei oder drei Rillen aus¬ reichend sind, wobei die unterste Rille nach unten hin offen sein kann. Die Kontaktfläche selbst ist gemäß der zylindrischen Oberfläche des Kollektors gekrümmt. Die Nei¬ gung der Kontaktfläche gegenüber der Mantelfläche des Kol¬ lektors liegt in der Größenordnung von 6 bis 10 Grad, vor¬ zugsweise bei ca. 8 Grad. Die einzustellende Neigung hängt u.a. auch davon ab, welche elektrischen Ströme durch die Bürste übertragen werden sollen.It has been found that two or three grooves are sufficient, the lowest groove being open at the bottom. The contact surface itself is curved according to the cylindrical surface of the collector. The inclination of the contact surface in relation to the lateral surface of the collector is in the order of 6 to 10 degrees, preferably approximately 8 degrees. The inclination to be set depends, among other things. also depends on which electrical currents are to be transmitted through the brush.
Die Neigung kann umso kleiner gewählt werden, je höher die elektrischen Ströme sind, die zu übertragen sind.The inclination can be selected the smaller the higher the electrical currents to be transmitted.
Die Erfindung wird im folgenden anhand von 4 Figuren näher erläutert.The invention is explained in more detail below with reference to 4 figures.
Die Figuren la,1b,1c zeigen eine Kohlebürste in verschiedenen Ansichten,Figures la, 1b, 1c show a carbon brush in different views,
die Figur 2 einen Ausschnitt aus der Figur la.2 shows a section of the figure la.
Die dargestellt Kohlebürste 1 besteht aus einem länglichen Quader, der im Querschnitt (Figur lb) in etwa quadratisch und im Längsschnitt (Figur la) in etwa rechteckig ist.The carbon brush 1 shown consists of an elongated cuboid, which is approximately square in cross section (FIG. 1b) and approximately rectangular in longitudinal section (FIG. 1 a).
Eine derartige Kohlebürste ist mit eine Litze 2 versehen, über die die Stromzuführung erfolgt. Die Bürsten werden in Köchern geführt, die auf eine Bürstentrageplatte angeord¬ net sind.Such a carbon brush is provided with a strand 2, via which the current is supplied. The brushes are guided in quivers which are arranged on a brush support plate.
Eine Stirnfläche der Bürste, die Kontaktfläche 3, gelangt nach dem Zusammenbau eines Motors an die Mantelfläche ei¬ nes Kollektors 4.An end face of the brush, the contact face 3, reaches the outer face of a collector 4 after the assembly of a motor.
Im Ausführungsbeispiel ist ein zylinderförmiger Kollektor vorgesehen, wobei die Kontaktfläche des Kollektors auf seiner Mantelfläche angeordnet ist. Die Kontaktfläche 3 der Bürste 1 gelangt zur Anlage an die Mantelfläche/Kontaktfläche des Kollektors 4.In the exemplary embodiment, a cylindrical collector is provided, the contact surface of the collector being arranged on its outer surface. The contact surface 3 of the brush 1 comes into contact with the outer surface / contact surface of the collector 4.
Die Kontaktfläche 3 der Bürste 1 ist nun wie folgt gestal¬ tet: In Querrichtung, das heißt in Umfangsrichtung des Kollektors ist die Kontaktfläche 3, wie in Figur lc zu erkennen, gekrümmt. Die Krümmung entspricht dabei im we¬ sentlichen dem Radius des Kollektors 4.The contact surface 3 of the brush 1 is now designed as follows: in the transverse direction, that is to say in the circumferential direction of the collector, the contact surface 3 is curved, as can be seen in FIG. 1c. The curvature essentially corresponds to the radius of the collector 4.
In Axialrichtung ist die Kontaktfläche 3 zur Mantelfläche des Kollektors 4 geneigt. Zwischen der Mantelfläche des Kollektors 4 und der Kontaktfläche 3 der Bürste 1 ist da¬ mit ein keilförmiger Spalt 5 ausgebildet. Die untere Kante 6, das ist die Kante, die an der Mantelfläche des Kollek¬ tors 4 anliegt, ist mit ein oder mehreren Rillen 10,11,12 versehen, die sich in Querrichtung über die gesamte Breite der Kontaktfläche 3 erstrecken. Die Bürste wird vorzugsweise so im Köcher positioniert, daß die untere Kante 6 nahe der Bürstentrageplatte ist. Es ist allerdings auch möglich die Bürste so zu positionie¬ ren, daß die untere Kante einen Abstand zur Bürstentra¬ geplatte aufweist.In the axial direction, the contact surface 3 is inclined to the outer surface of the collector 4. A wedge-shaped gap 5 is thus formed between the lateral surface of the collector 4 and the contact surface 3 of the brush 1. The lower edge 6, that is the edge which lies against the outer surface of the collector 4, is provided with one or more grooves 10, 11, 12 which extend in the transverse direction over the entire width of the contact surface 3. The brush is preferably positioned in the holder so that the lower edge 6 is close to the brush support plate. However, it is also possible to position the brush in such a way that the lower edge is at a distance from the brush support plate.
Wie aus der Figur 2 zu erkennen ist, sind die Rillen 10,11,12 spitzwinklig, das heißt sie weisen im Querschnitt ein dreieckförmiges Profil auf. Dabei ist die unterste Rille 10, nach unten offen, das heißt es erfolgte ledig¬ lich eine Abschrägung gegenüber der Unterseite 13 der Bür¬ ste 1.As can be seen from FIG. 2, the grooves 10, 11, 12 are acute-angled, that is to say they have a triangular profile in cross section. The bottom groove 10 is open at the bottom, that is to say there is only a bevel opposite the underside 13 of the brush 1.
Die Bürsten werden wie folgt hergestellt.The brushes are made as follows.
Aus einer Mischung, die im wesentlichen Graphit enthält, werden Rohlinge gepreßt und gesintert. Dabei steht an der Oberfläche der Bürsten eine harte Schicht, die zumindest im Bereich der Stirnfläche 3 abgeschmirgelt bzw. abgefräst werden muß. Auch die Schicht an den Längsseiten der Bürste kann auf diese Weise entfernt werden.Blanks are pressed and sintered from a mixture that essentially contains graphite. There is a hard layer on the surface of the brushes, which must be sanded or milled off at least in the area of the end face 3. The layer on the long sides of the brush can also be removed in this way.
Sodann wird die Stirnfläche 3, wie oben beschrieben, ange¬ schrägt, wobei durch die Wahl des Werkzeuges eine entspre¬ chende Krümmung in Umfangsrichtung erzielt wird. Sodann werden an der unteren Kante eine oder mehrere Rillen in Querrichtung eingefräst.The end face 3 is then beveled, as described above, the corresponding curvature in the circumferential direction being achieved by the choice of the tool. Then one or more grooves are milled in the transverse direction on the lower edge.
Mit einer derartigen Kohlenbürste kann der Motor sehr ge¬ räuscharm betrieben werden. Die vorstehenden Kanten 14,15 werden häufig schon bei Probeläufen des Motors abgeschlif¬ fen. Das heißt die Bürste enthält von der unteren Kante beginnend nach und nach eine der Außenflächen des Kollek¬ tors angepaßte Form.With such a carbon brush, the motor can be operated with very little noise. The protruding edges 14, 15 are often ground off during test runs of the engine. That is to say the brush contains, starting from the lower edge, a shape which is adapted to the outer surfaces of the collector.
Es hat sich herausgestellt, daß auf diese Weise der Motor sehr geräuscharm arbeitet. Ergänzend sei ausgeführt, daß die Kontaktfläche 3 etwa einen Winkel von 6 bis 10 Grad zur Mantelfläche des Kol¬ lektors einschließen soll. It has been found that the motor works very quietly in this way. In addition, it should be stated that the contact surface 3 should enclose an angle of approximately 6 to 10 degrees to the lateral surface of the collector.

Claims

Patentansprüche claims
1. Kohlebürste (1) für eine elektrische Maschine mit einer Stirnfläche (3), die zur Anlage an einen Kol¬ lektor (4) gebracht wird, dadurch gekennzeichnet, daß die Stirnfläche (3) in Bezug auf die Axialrichtung des Kollektors (4) geneigt ist und der untere Bereich mit einer oder mehreren Rillen (10,11,12) in Quer¬ richtung (Tangentialrichtung) versehen ist.1. Carbon brush (1) for an electrical machine with an end face (3) which is brought into contact with a collector (4), characterized in that the end face (3) with respect to the axial direction of the collector (4) is inclined and the lower region is provided with one or more grooves (10, 11, 12) in the transverse direction (tangential direction).
2. Kohlebürste nach Anspruch 1, dadurch gekennzeichnet, daß zwei oder drei Rillen (10,11,12) vorgesehen sind.2. Carbon brush according to claim 1, characterized in that two or three grooves (10, 11, 12) are provided.
3. Kohlebürste nach Anspruch 1 oder 2, dadurch gekenn¬ zeichnet, daß die Kontaktfläche (3) entsprechend dem Radius des Kollektors (4) gekrümmt ist.3. Carbon brush according to claim 1 or 2, characterized gekenn¬ characterized in that the contact surface (3) is curved according to the radius of the collector (4).
4. Kohlebürste nach Anspruch 1 oder 2, dadurch gekenn¬ zeichnet, daß die Rillen (10,11,12) im Schnitt im we¬ sentlichen dreieckförmig sind.4. Carbon brush according to claim 1 or 2, characterized gekenn¬ characterized in that the grooves (10,11,12) are substantially triangular in section.
5. Kohlebürste nach Anspruch 1, 2 oder 4, dadurch gekennzeichnet, daß die unterste Rille (10) nach un¬ ten hin offen ist.5. Carbon brush according to claim 1, 2 or 4, characterized in that the bottom groove (10) is open towards the bottom.
6. Kohlebürste nach Anspruch 1, dadurch gekennzeichnet, daß die Neigung der Kontaktfläche (3) gegenüber dem Kollektor (4) etwa 6 bis 10 Grad beträgt.6. Carbon brush according to claim 1, characterized in that the inclination of the contact surface (3) relative to the collector (4) is approximately 6 to 10 degrees.
7. Kohlebürste nach Anspruch 6, dadurch gekennzeichnet, daß die Neigung vorzugsweise 8 Grad beträgt.7. Carbon brush according to claim 6, characterized in that the inclination is preferably 8 degrees.
8. Kohlebürste nach Anspruch 1, dadurch gekennzeichnet, daß die untere Kante (6) der Kontaktfläche (3), nahe einer Bürstentrageplatte angeordnet ist, auf der Kö¬ cher angeordnet sind, in der die Bürste (1) geführt ist. 8. Carbon brush according to claim 1, characterized in that the lower edge (6) of the contact surface (3) is arranged near a brush support plate on which Kö¬ cher are arranged, in which the brush (1) is guided.
9. Kohlebürste nach Anspruch 1, dadurch gekennzeichnet, daß nur der untere Bereich mit Rillen (10,11,12) ver¬ sehen ist.9. Carbon brush according to claim 1, characterized in that only the lower region with grooves (10, 11, 12) is seen.
10. Kohlebürste nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Oberflächenhaut, die beim Pressen der Bürst entsteht, entfernt ist. 10. Carbon brush according to one of the preceding claims, characterized in that the surface skin which is produced when pressing the brush is removed.
EP96900555A 1995-01-03 1996-01-02 Carbon brush Revoked EP0801825B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19500016 1995-01-03
DE19500016 1995-01-03
PCT/EP1996/000001 WO1996021260A1 (en) 1995-01-03 1996-01-02 Carbon brush

Publications (2)

Publication Number Publication Date
EP0801825A1 true EP0801825A1 (en) 1997-10-22
EP0801825B1 EP0801825B1 (en) 2000-05-17

Family

ID=7750926

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900555A Revoked EP0801825B1 (en) 1995-01-03 1996-01-02 Carbon brush

Country Status (9)

Country Link
US (1) US5909077A (en)
EP (1) EP0801825B1 (en)
JP (1) JPH10511838A (en)
BR (1) BR9606965A (en)
CZ (1) CZ287118B6 (en)
DE (2) DE19533031A1 (en)
ES (1) ES2145423T3 (en)
HU (1) HUP9802169A3 (en)
WO (1) WO1996021260A1 (en)

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DE19962363A1 (en) * 1999-12-23 2001-06-28 Pierburg Ag Wet running DC motor
KR20020074325A (en) * 2001-03-20 2002-09-30 주식회사 캄코 Brush for an electric motor
JP3511513B2 (en) * 2001-05-10 2004-03-29 三菱電機株式会社 Brush equipment
US7265475B2 (en) * 2004-03-30 2007-09-04 Trico Products Corporation Electric motor having convex high-speed brush
US20060055276A1 (en) * 2004-09-16 2006-03-16 O'donnell Steven B Keyed motor brushes
FR2896095B1 (en) * 2006-01-11 2008-06-13 Siemens Vdo Automotive Sas BROOM FOR ELECTRIC MOTOR
DE102007053314A1 (en) 2007-11-08 2009-05-14 Robert Bosch Gmbh Carbon brush for electric machine, has bearing area brought in contact element of electric machine rotated for arrangement, where bearing surface area of carbon brush is increased during pre-defined running-in period
DE102010009833A1 (en) * 2009-03-03 2010-10-07 Johnson Electric S.A. electric motor
CN108233583B (en) * 2016-12-14 2021-11-30 德昌电机(深圳)有限公司 Motor and electric brush thereof
JP7463859B2 (en) * 2020-06-08 2024-04-09 株式会社オートネットワーク技術研究所 Wire Harness Unit
JP7524672B2 (en) * 2020-08-26 2024-07-30 住友電装株式会社 Wire Harness Unit

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US2296366A (en) * 1941-12-29 1942-09-22 Standard Oil Dev Co Borehole tool
US3205382A (en) * 1960-07-01 1965-09-07 Ford Motor Co Dynamoelectric machine
US3467846A (en) * 1965-05-05 1969-09-16 Lorraine Carbone Brushes for electric motors
DE6802635U (en) * 1968-01-11 1969-03-13 Rau Swf Autozubehoer CHARCOAL BRUSH FOR ELECTRIC MACHINERY
GB1255501A (en) * 1968-01-19 1971-12-01 Lucas Industries Ltd Electric motors
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DE7626775U1 (en) * 1976-08-27 1976-12-16 Deutsche Carbone Ag, 6000 Frankfurt Carbon brush for electrical machines
FR2437710A1 (en) * 1978-09-26 1980-04-25 Lorraine Carbone Grooved brushes for electrical machines - have grooves, pref. of triangular cross=section formed in rubbing face without intersecting periphery of brush to avoid chipping
JPS55109155A (en) * 1979-02-09 1980-08-22 Matsushita Electric Works Ltd Carbon brush for motor
DE7917605U1 (en) * 1979-06-20 1980-11-27 Deutsche Carbone Ag, 6000 Frankfurt Low-noise carbon brush
SU1092630A1 (en) * 1982-12-24 1984-05-15 Предприятие П/Я В-4514 Electric machine brush
JPH058787Y2 (en) * 1989-05-15 1993-03-04
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Title
See references of WO9621260A1 *

Also Published As

Publication number Publication date
EP0801825B1 (en) 2000-05-17
ES2145423T3 (en) 2000-07-01
HUP9802169A3 (en) 2002-03-28
DE19533031A1 (en) 1996-07-04
HUP9802169A2 (en) 1998-12-28
JPH10511838A (en) 1998-11-10
DE59605249D1 (en) 2000-06-21
CZ208897A3 (en) 1997-11-12
CZ287118B6 (en) 2000-09-13
WO1996021260A1 (en) 1996-07-11
BR9606965A (en) 1999-01-26
US5909077A (en) 1999-06-01

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