EP0615316A2 - Brush holder for mechanic commutated electric motors - Google Patents

Brush holder for mechanic commutated electric motors Download PDF

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Publication number
EP0615316A2
EP0615316A2 EP94102266A EP94102266A EP0615316A2 EP 0615316 A2 EP0615316 A2 EP 0615316A2 EP 94102266 A EP94102266 A EP 94102266A EP 94102266 A EP94102266 A EP 94102266A EP 0615316 A2 EP0615316 A2 EP 0615316A2
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EP
European Patent Office
Prior art keywords
commutator
guide
pressure spring
brush holder
support plate
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
EP94102266A
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German (de)
French (fr)
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EP0615316A3 (en
EP0615316B1 (en
Inventor
Hugo Herrmann
Werner Decker
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP0615316A2 publication Critical patent/EP0615316A2/en
Publication of EP0615316A3 publication Critical patent/EP0615316A3/en
Application granted granted Critical
Publication of EP0615316B1 publication Critical patent/EP0615316B1/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
    • H01R39/38—Brush holders
    • H01R39/41—Brush holders cartridge type
    • H01R39/415—Brush holders cartridge type with self-recoiling spring

Definitions

  • the invention relates to a brush holder according to the preamble of the main claim.
  • a brush holder is already known (EP-OS 0 397 973), in which, in order to mount the brush holder, the pressure spring with its section located between the rollers must be guided through the guide quiver, so that spring sections are located between the inner wall of the holder and the grinding brush are located. Such an assembly is cumbersome and therefore expensive.
  • the brush holder according to the invention with the characterizing features of the main claim has the advantage that the pressure spring can be pushed over the open edge side of the slots into its working position in which the central portion of the pressure spring located between the rollers lies in the recesses in the side walls of the guide quiver is coming.
  • FIG. 1 shows a plan view of a brush support plate with two grinding brushes arranged in guide pockets, of which a guide holder and the grinding brush are shown in section
  • FIG. 2 shows the guide holder shown in section in section, in enlarged view
  • FIG. 3 shows the guide holder according to FIG Shown from below
  • FIG. 4 shows the guide holder according to FIG. 2 along the line IV-IV
  • FIG. 5 shows a view of the guide holder in the direction of arrow V in FIG. 4
  • FIG. 6 shows an exploded view of a brush holder, a grinding brush assigned to it and an associated pressure spring .
  • a brush holder 10 shown in FIG. 1 belongs to a mechanically commutated electric motor, not shown. It has a support plate 12 fixedly connected to the frame or the housing of the motor, to which two shaft-like guide quivers 14 and 16 are fastened in the exemplary embodiment.
  • a grinding brush 18 is slidably disposed in the shafts of the two guide quivers 14 and 16.
  • the guide quiver 14 and 16 are oriented such that the direction of displacement for the grinding brushes 18 is approximately radial to a commutator 20 of the electric motor, indicated by dash-dotted lines in FIG.
  • On the support plate 12 there are further contact points 22 to which lead cables 24 belonging to the working circuit of the electric motor. Brush strands 26 lead from the contact points 22 to the grinding brushes 18.
  • the guide quiver 16 has a tubular cross section which is essentially rectangular to square in cross section. This can be seen in particular from FIG. 3. With its rear wall 27, it faces the support plate 12 and is connected to it in a manner known per se via bending tongues 28.
  • the rear wall 27 is adjoined by two side walls 30 (FIG. 3), which extend transversely to the plane of the support plate 12 when the guide quiver 16 is mounted.
  • the two side walls 30 merge into a front wall 32 which is at a distance from the rear wall 27 and extends substantially parallel to the latter.
  • the cross-sectional shape of the abrasive brush 18 is matched to the resulting cross-sectional shape of the interior of the shaft in such a way that it can be displaced in the direction of the shaft axis without substantial play.
  • the grinding brush 18 lies against the jacket of the commutator 20 with a grinding surface 34 (FIG. 6).
  • Correct contact of the grinding brush 18 on the commutator of the electric motor is achieved by a pressure spring 40, which is shown in FIG. 6.
  • the pressure spring 40 is designed as a strip-shaped leaf spring, the two end sections of which are rolled up in opposite directions so that rollers 42 result.
  • the guide quiver 16 each has a cutout 50 in its side walls 30, which extends from that of Commutator 20 facing away from the end of the guide quiver 16 is open.
  • the cutouts 50 are formed in that support legs 52 are sheared out and bent out of the side walls 30.
  • the depth 53 of the recesses extends beyond the center of the length of the quiver 16.
  • Their width 54 is at least as large as the width 56 of the pressure spring 40.
  • the legs 52 which are bent out of the side walls 30 serve to support the rollers 42 of the pressure spring 40.
  • Each support leg 52 has a slot 58 in the transition area to its side wall (FIG. 3), whose depth 60 is at least as large as the width 56 of the pressure spring 40. It is clear that the depth 60 of the slots 58 is always smaller than the width of the legs 52, which results from the width 54 of the recesses 50.
  • the slots 58 are open to the edge on the side of the support legs 52 facing away from the support plate 12.
  • One longitudinal side of the slots 58 is open to the recess 50 located in its side wall 30, so that the slots 58 merge into the recesses 50 adjacent to them.
  • the length 62 of the legs 52 is dimensioned such that it is greater than the radius of the rollers 42.
  • the free end sections of the legs are bent in such a way that their free ends point approximately towards the commutator 20.
  • FIGS. 2, 3 and 5 in particular show that the arrangement of tabs on the longitudinal edges of the support legs 52 has already been taken into account when pulling out, which, as can be seen from the figures mentioned, are placed up to the commutator 20 and guide stops 64 for the rollers 42 form.
  • FIGS. 1 and 2 also show that the front wall 32 of the guide sleeve 16 has a passage slot 66 for the strand 26, which is open at the edge on the side of the guide sleeve 16 facing away from the commutator
  • the pressure spring 40 is pushed into the slots 58 until it abuts the end edge of the slots 58.
  • care must be taken that the rollers 42 come to rest on the support surfaces 78 of the legs 52 facing the commutator 20.
  • the pressure spring is secured between the end edges of the slots 58 and the guide stops (tab 64) facing them.
  • the central section 44 of the pressure spring 40 bears against the end face 48 of the grinding brush 18.
  • the partially rolled-up rollers 42 now result in a pretension, by means of which the grinding brush is spring-loaded in the direction of the arrow 70 towards the commutator 20.
  • the assembly of the brush holder according to the invention is comparatively simple because the pressure spring 40 no longer has to be threaded through the shaft of the guide quiver, but because it can only be installed from the outside in the direction of arrow 75. In its assembly position, it then lies with its U-legs 76 in the recesses 50 of the side walls 30. As the abrasive brush 18 progressively wears, the current-carrying wire 26 passes ever deeper into the lead-through slot 66, in which you already insert the abrasive brush 18 during the assembly described enters the guide quiver 16.
  • EP 0 397 973 A2 already mentioned at the beginning, which was assumed when the claim was drawn up and whose disclosure thus becomes the disclosure of the present application for industrial property rights.

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  • Motor Or Generator Current Collectors (AREA)

Abstract

A brush holder is proposed which is used for mechanical commutation of an electric motor. The brush holder contains a support plate and, fastened thereon, shaft-like guide tubes for sliding brushes pressed by spring action onto a commutator of the electric motor, the pressure spring which is formed as a strip-like leaf spring being coiled at its two end sections in opposite senses, the coils formed in this way being braced against surfaces of limbs which face the commutator, which limbs are arranged on the side walls of the guide tube which are directed transverse to the support plate and the middle section of the prestressed pressure spring loading the end surface of the slide brush which faces away from the commutator. Particularly simple mounting of the brush holder is achieved if the two side walls of the guide tube have recesses which are open edged towards their end facing away from the commutator, the depths of which extend as far as the bracing limbs, if the width of these recesses is larger than the width of the pressure spring and each bracing limb is provided with a slit in the transition to the tube side wall, which slit is open-edged on the side of the bracing limb facing away from the support plate, the depth of which slit corresponds at least to the width of the pressure spring and one longitudinal side of which slit extends into the recess located in its side wall of the guide tube. <IMAGE>

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Bürstenhalter nach der Gattung des Hauptanspruchs. Es ist schon ein Bürstenhalter bekannt (EP-OS 0 397 973), bei dem zur Montage des Bürstenhalters die Andrückfeder mit ihrem zwischen den Rollen befindlichen Abschnitt durch den Führungsköcher hindurch geführt werden muß, so daß sich Federabschnitte zwischen der Köcher-Innenwand und der Schleifbürste befinden. Eine solche Montage ist umständlich und damit teuer.The invention relates to a brush holder according to the preamble of the main claim. A brush holder is already known (EP-OS 0 397 973), in which, in order to mount the brush holder, the pressure spring with its section located between the rollers must be guided through the guide quiver, so that spring sections are located between the inner wall of the holder and the grinding brush are located. Such an assembly is cumbersome and therefore expensive.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Bürstenhalter mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß die Andrückfeder über die randoffene Seite der Schlitze in ihre Arbeitsposition geschoben werden kann, in der der zwischen den Rollen befindliche Mittelabschnitt der Andrückfeder in die Aussparungen in den Seitenwänden des Führungsköchers zu liegen kommt.The brush holder according to the invention with the characterizing features of the main claim has the advantage that the pressure spring can be pushed over the open edge side of the slots into its working position in which the central portion of the pressure spring located between the rollers lies in the recesses in the side walls of the guide quiver is coming.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Bürstenhalters möglich.The measures listed in the subclaims enable advantageous developments and improvements of the brush holder specified in the main claim.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Draufsicht auf eine Bürstentragplatte mit zwei in Führungsköchern angeordneten Schleifbürsten, von denen ein Führungsköcher und die Schleifbürste geschnitten dargestellt sind, Figur 2 den in Figur 1 geschnitten dargestellten Führungsköcher in Ansicht, vergrößert dargestellt, Figur 3 den Führungsköcher gemäß Figur 2 in Ansicht von unten dargestellt, Figur 4 den Führungsköcher gemäß Figur 2 entlang der Linie IV-IV geschnitten, Figur 5 eine Ansicht des Führungsköchers in Richtung des Pfeiles V in Figur 4 und Figur 6 eine Explosionsdarstellung eines Bürstenköchers, einer diesem zugeordneten Schleifbürste und einer dazugehörigen Andrückfeder.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a plan view of a brush support plate with two grinding brushes arranged in guide pockets, of which a guide holder and the grinding brush are shown in section, FIG. 2 shows the guide holder shown in section in section, in enlarged view, FIG. 3 shows the guide holder according to FIG Shown from below, FIG. 4 shows the guide holder according to FIG. 2 along the line IV-IV, FIG. 5 shows a view of the guide holder in the direction of arrow V in FIG. 4, and FIG. 6 shows an exploded view of a brush holder, a grinding brush assigned to it and an associated pressure spring .

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein in Figur 1 dargestellter Bürstenhalter 10 gehört zu einem nicht dargestellten, mechanisch kommutierten Elektromotor. Er weist eine fest mit dem Gestell oder dem Gehäuse des Motors verbundene Tragplatte 12 auf, an der beim Ausführungsbeispiel zwei schachtartige Führungsköcher 14 und 16 befestigt sind. In den Schächten der beiden Führungsköcher 14 und 16 ist jeweils eine Schleifbürste 18 verschiebbar angeordnet. Dabei sind die Führungsköcher 14 und 16 so ausgerichtet, daß die Verschieberichtung für die Schleifbürsten 18 etwa radial zu einem in Figur 1 strichpunktiert angedeuten Kommutator 20 des Elektromotors verlaufen. An der Tragplatte 12 sind weiter Kontaktstellen 22 angeordnet, zu denen zum Arbeitsstromkreis des Elektromotors gehörende Leitungskabel 24 führen. Von den Kontaktstellen 22 aus führen Bürstenlitzen 26 zu den Schleifbürsten 18.A brush holder 10 shown in FIG. 1 belongs to a mechanically commutated electric motor, not shown. It has a support plate 12 fixedly connected to the frame or the housing of the motor, to which two shaft-like guide quivers 14 and 16 are fastened in the exemplary embodiment. A grinding brush 18 is slidably disposed in the shafts of the two guide quivers 14 and 16. The guide quiver 14 and 16 are oriented such that the direction of displacement for the grinding brushes 18 is approximately radial to a commutator 20 of the electric motor, indicated by dash-dotted lines in FIG. On the support plate 12 there are further contact points 22 to which lead cables 24 belonging to the working circuit of the electric motor. Brush strands 26 lead from the contact points 22 to the grinding brushes 18.

Da die beiden Führungsköcher 14 und 16 völlig gleich ausgebildet sind, wird deren Aufbau lediglich anhand des einen, in den Figuren 2 bis 5 dargestellten Führungsköchers 16 erläutert. Der Führungsköcher 16 hat einen rohrförmigen, im Querschnitt im wesentlichen rechteckigen bis quadratischen Querschnitt. Dies ist insbesondere aus Figur 3 ersichtlich. Er ist mit seiner Rückwand 27 der Tragplatte 12 zugekehrt und über Biegezungen 28 mit dieser in an sich bekannter Weise verbunden. An die Rückwand 27 schließen sich zwei Seitenwände 30 an (Figur 3), die sich bei montiertem Führungsköcher 16 quer zur Ebene der Tragplatte 12 erstrecken. Die beiden Seitenwände 30 gehen in eine Vorderwand 32 über, die mit Abstand von der Rückwand 27 liegt und sich im wesentlichen parallel zu dieser erstreckt. Auf die sich so ergebende Querschnittsform des Schachtinneren ist die Querschnittsform der Schleifbürste 18 so abgestimmt, daß diese in Richtung der Schachtachse ohne wesentliches Spiel verschiebbar ist. Die Schleifbürste 18 liegt im betriebsfähigen Zustand mit einer Schleiffläche 34 (Figur 6) am Mantel des Kommutators 20 an. Eine ordnungsgemäße Anlage der Schleifbürste 18 am Kommutator des Elektromotors wird durch eine Andrückfeder 40 erreicht, die in Figur 6 dargestellt ist. Die Andrückfeder 40 ist als streifenförmige Blattfeder ausgebildet, deren beide Endabschnitte gegensinnig so aufgerollt sind, daß sich Rollen 42 ergeben. Zwischen diesen beiden Endabschnitten mit den Rollen 42 befindet sich ein Mittelabschnitt 44, der die Basis einer U-Form der Feder 40 bildet, wenn die Rollen 42 teilweise abgerollt sind. Das Maß zwischen den beiden U-Schenkeln entspricht im wesentlichen dem Maß 46, das die Schleifbürste 18 an ihrer Breite aufweist (Figur 6). Die Andrückfeder 40 kann somit so über die Schleifbürste 18 gestülpt werden, daß der Mittelabschnitt 44 der Andrückfeder 40 an einer der Schleiffläche 34 der Schleifbürste 18 gegenüberliegenden Endfläche 48 der Schleifbürste 18 zur Anlage kommt. Wie insbesondere Figur 4 zeigt, weist der Führungsköcher 16 in seinen Seitenwänden 30 je eine Aussparung 50 auf, die zu dem vom Kommutator 20 abgewandten Ende des Führungsköchers 16 randoffen ist. Die Aussparungen 50 sind dadurch gebildet, daß aus den Seitenwänden 30 Abstützschenkel 52 herausgeschert und herausgebogen sind. Die Tiefe 53 der Aussparungen erstreckt sich über die Mitte der Länge des Köchers 16 hinaus. Ihre Breite 54 ist zumindest so groß wie die Breite 56 der Andrückfeder 40. Die aus den Seitenwänden 30 herausgebogenen Schenkel 52 dienen zur Abstützung der Rollen 42 der Andrückfeder 40. Jeder Abstützschenkel 52 hat im Übergangsbereich zu seiner Seitenwand einen Schlitz 58 (Figur 3), dessen Tiefe 60 zumindest so groß ist wie die Breite 56 der Andrückfeder 40. Es ist klar, daß die Tiefe 60 der Schlitze 58 stets kleiner ist als die Breite der Schenkel 52, die sich aus der Breite 54 der Aussparungen 50 ergibt. Die Schlitze 58 sind zu der von der Tragplatte 12 abgewandten Seite der Abstützschenkel 52 randoffen. Die eine Längsseite der Schlitze 58 ist zu der in seiner Seitenwand 30 befindlichen Aussparung 50 offen, so daß die Schlitze 58 in die ihnen benachbarten Aussparungen 50 übergehen. Die Länge 62 der Schenkel 52 ist so bemessen, daß sie größer ist als der Radius der Rollen 42. Die freien Endabschnitte der Schenkel sind so angebogen, daß ihre freien Enden etwa zum Kommutator 20 weisen. Weiter zeigen insbesondere die Figuren 2, 3 und 5, daß an den Längskanten der Abstützschenkel 52 schon beim Ausscheren die Anordnung von Lappen berücksichtigt worden ist, die, wie aus den genannten Figuren ersichtlich, zum Kommutator 20 hochgestellt sind und Führungsanschläge 64 für die Rollen 42 bilden. Weiter zeigen die Figuren 1 und 2, daß die Vorderwand 32 des Führungsköchers 16 einen Durchtrittschlitz 66 für die Litze 26 hat, der zu der vom Kommutator 20 abgewandten Seite des Führungsköchers 16 randoffen ist.Since the two guide quivers 14 and 16 are of completely identical design, their construction is only explained with reference to the one guide quiver 16 shown in FIGS. 2 to 5. The guide quiver 16 has a tubular cross section which is essentially rectangular to square in cross section. This can be seen in particular from FIG. 3. With its rear wall 27, it faces the support plate 12 and is connected to it in a manner known per se via bending tongues 28. The rear wall 27 is adjoined by two side walls 30 (FIG. 3), which extend transversely to the plane of the support plate 12 when the guide quiver 16 is mounted. The two side walls 30 merge into a front wall 32 which is at a distance from the rear wall 27 and extends substantially parallel to the latter. The cross-sectional shape of the abrasive brush 18 is matched to the resulting cross-sectional shape of the interior of the shaft in such a way that it can be displaced in the direction of the shaft axis without substantial play. In the operational state, the grinding brush 18 lies against the jacket of the commutator 20 with a grinding surface 34 (FIG. 6). Correct contact of the grinding brush 18 on the commutator of the electric motor is achieved by a pressure spring 40, which is shown in FIG. 6. The pressure spring 40 is designed as a strip-shaped leaf spring, the two end sections of which are rolled up in opposite directions so that rollers 42 result. Between these two end sections with the rollers 42 there is a central portion 44 which forms the base of a U-shape of the spring 40 when the rollers 42 are partially unrolled. The dimension between the two U-legs essentially corresponds to dimension 46, which the abrasive brush 18 has in its width (FIG. 6). The pressure spring 40 can thus be placed over the grinding brush 18 such that the central portion 44 of the pressure spring 40 comes to rest on an end surface 48 of the grinding brush 18 opposite the grinding surface 34 of the grinding brush 18. As shown in FIG. 4 in particular, the guide quiver 16 each has a cutout 50 in its side walls 30, which extends from that of Commutator 20 facing away from the end of the guide quiver 16 is open. The cutouts 50 are formed in that support legs 52 are sheared out and bent out of the side walls 30. The depth 53 of the recesses extends beyond the center of the length of the quiver 16. Their width 54 is at least as large as the width 56 of the pressure spring 40. The legs 52 which are bent out of the side walls 30 serve to support the rollers 42 of the pressure spring 40. Each support leg 52 has a slot 58 in the transition area to its side wall (FIG. 3), whose depth 60 is at least as large as the width 56 of the pressure spring 40. It is clear that the depth 60 of the slots 58 is always smaller than the width of the legs 52, which results from the width 54 of the recesses 50. The slots 58 are open to the edge on the side of the support legs 52 facing away from the support plate 12. One longitudinal side of the slots 58 is open to the recess 50 located in its side wall 30, so that the slots 58 merge into the recesses 50 adjacent to them. The length 62 of the legs 52 is dimensioned such that it is greater than the radius of the rollers 42. The free end sections of the legs are bent in such a way that their free ends point approximately towards the commutator 20. Furthermore, FIGS. 2, 3 and 5 in particular show that the arrangement of tabs on the longitudinal edges of the support legs 52 has already been taken into account when pulling out, which, as can be seen from the figures mentioned, are placed up to the commutator 20 and guide stops 64 for the rollers 42 form. FIGS. 1 and 2 also show that the front wall 32 of the guide sleeve 16 has a passage slot 66 for the strand 26, which is open at the edge on the side of the guide sleeve 16 facing away from the commutator 20.

Die Montage der Schleifbürste 18 und der Andrückfeder 40 im bzw. am Führungsköcher 16 soll anhand der Figur 6 gezeigten Explosionsdarstellung erläutert werden. Dabei muß allerdings berücksichtigt werden, daß in der Praxis der Führungsköcher 16 schon an der Tragplatte 12 mittels seiner Biegezungen 28 befestigt ist. Zunächst wird die Schleifbürste 18 in Richtung des Pfeiles 70 in den Führungsköcher 16 geschoben, bis seine Schleiffläche 34 am Kommutator 20 anliegt. Danach wird die Andrückfeder 40 so aufgerollt, daß sich etwa die in Figur 6 dargestellte Konfiguration ergibt. Danach wird die Feder in Richtung des Pfeiles 75 über den Führungsköcher 16 gestülpt, wobei die Schenkel 76 der U-Form in die Schlitze 58 der Abstützschenkel 52 gelangen. Die Andrückfeder 40 wird so weit in die Schlitze 58 hineingeschoben, bis sie an der Endkante der Schlitze 58 anliegt. Bei dem Aufschieben der Andrückfeder 40 ist darauf zu achten, daß die Rollen 42 an den dem Kommutator 20 zugewandten Stützflächen 78 der Schenkel 52 zur Anlage kommen. In dieser Betriebsstellung ist die Andrückfeder zwischen den Endkanten der Schlitze 58 und den diesen zugewandten Führungsanschlägen (Lappen 64) gesichert. In dieser dann erreichten Betriebsstellung liegt der Mittelabschnitt 44 der Andrückfeder 40 an der Endfläche 48 der Schleifbürste 18 an. Durch die teilweise aufgerollten Rollen 42 ergibt sich nun eine Vorspannung, durch welche die Schleifbürste in Richtung des Pfeiles 70 zum Kommutator 20 hin federbelastet ist.The assembly of the grinding brush 18 and the pressure spring 40 in or on the guide holder 16 will be explained with reference to the exploded view shown in FIG. 6. However, it must be taken into account that in practice the guide quiver 16 is already on the support plate 12 is fastened by means of its bending tongues 28. First, the grinding brush 18 is pushed in the direction of the arrow 70 into the guide holder 16 until its grinding surface 34 abuts the commutator 20. Then the pressure spring 40 is rolled up in such a way that the configuration shown in FIG. 6 is obtained. The spring is then placed over the guide sleeve 16 in the direction of arrow 75, the legs 76 of the U-shape reaching the slots 58 of the support legs 52. The pressure spring 40 is pushed into the slots 58 until it abuts the end edge of the slots 58. When pushing on the pressure spring 40, care must be taken that the rollers 42 come to rest on the support surfaces 78 of the legs 52 facing the commutator 20. In this operating position, the pressure spring is secured between the end edges of the slots 58 and the guide stops (tab 64) facing them. In this operating position then reached, the central section 44 of the pressure spring 40 bears against the end face 48 of the grinding brush 18. The partially rolled-up rollers 42 now result in a pretension, by means of which the grinding brush is spring-loaded in the direction of the arrow 70 towards the commutator 20.

Die Montage des erfindungsgemäßen Bürstenhalters ist vergleichsweise einfach, weil die Andrückfeder 40 nicht mehr durch den Schacht des Führungsköchers hindurchgefädelt werden muß, sondern weil sie lediglich von außen her in Richtung des Pfeiles 75 montiert werden kann. In ihrer Montagestellung liegt sie dann mit ihren U-Schenkeln 76 in den Aussparungen 50 der Seitenwände 30. Mit fortschreitender Abnutzung der Schleifbürste 18 gelangt die Stromführungslitze 26 immer tiefer in den Durchführungsschlitz 66, in dem Sie schon bei der beschriebenen Montage beim Einführen der Schleifbürste 18 in den Führungsköcher 16 eintritt. In diesem Zusammenhang wird hiermit ausdrücklich auf die eingangs schon erwähnte EP 0 397 973 A2 Bezug genommen, von der bei der Abfassung des Anspruchs ausgegangen worden ist, und deren Offenbarung somit zur Offenbarung der vorliegenden Schutzrechtsanmeldung wird.The assembly of the brush holder according to the invention is comparatively simple because the pressure spring 40 no longer has to be threaded through the shaft of the guide quiver, but because it can only be installed from the outside in the direction of arrow 75. In its assembly position, it then lies with its U-legs 76 in the recesses 50 of the side walls 30. As the abrasive brush 18 progressively wears, the current-carrying wire 26 passes ever deeper into the lead-through slot 66, in which you already insert the abrasive brush 18 during the assembly described enters the guide quiver 16. In this context, reference is hereby expressly made to EP 0 397 973 A2 already mentioned at the beginning, which was assumed when the claim was drawn up and whose disclosure thus becomes the disclosure of the present application for industrial property rights.

Claims (4)

Bürstenhalter für mechanisch kommutierte Elektromotoren, mit einer Tragplatte und daran befestigten, schachtartigen Führungsköchern, für an einem Kommutator des Elektromotors mittels Federkraft angedrückte Schleifbürsten, wobei die als streifenförmige Blattfedern ausgebildete Andrückfedern an ihren beiden Endabschnitten gegensinnig aufgerollt sind, die so gebildeten Rollen sich an dem Kommutator zugewandten Flächen von Schenkeln abstützen, die an den quer zur Tragplatte ausgerichteten Seitenwände der Führungsköcher angeordnet sind und der Mittelabschnitt der vorgespannten Andrückfeder die vom Kommutator abgewandte Endfläche der Schleifbürste belastet, dadurch gekennzeichnet, daß die beiden Seitenwände (30) des Führungsköchers (16) zu ihrem vom Kommutator (20) abgewandte Ende randoffene Aussparungen (50) aufweisen, deren Tiefe (52) bis zu den Abstützschenkeln (52) reichen, daß die Breite (54) der Aussparungen (50) größer ist als Breite (56) der Andrückfeder (40) und daß jeder Abstützschenkel (52) im Übergang zur Köcher-Seitenwand (30) mit einem Schlitz (58) versehen ist, der zu der von der Tragplatte (12) abgewandten Seite der Abstützschenkel (52) randoffen ist, dessen Tiefe zumindest der Breite (56) der Andrückfeder (40) entspricht und dessen eine Längsseite in die in seiner Seitenwand (30) des Führungsköchers (16) befindliche Aussparung (50) übergeht.Brush holder for mechanically commutated electric motors, with a support plate and shaft-like guide quivers attached to it, for abrasive brushes pressed onto a commutator of the electric motor by means of spring force, the pressure springs designed as strip-shaped leaf springs being rolled up in opposite directions at their two end sections, the rollers thus formed on the commutator Support facing surfaces of legs, which are arranged on the side walls of the guide quiver aligned transversely to the support plate and the central portion of the prestressed pressure spring loads the end face of the grinding brush facing away from the commutator, characterized in that the two side walls (30) of the guide quiver (16) are towards it The end facing away from the commutator (20) has open-cut recesses (50), the depth (52) of which extends to the support legs (52) such that the width (54) of the recesses (50) is greater than the width (56) of the pressure spring (40 ) and that each support leg (52) is provided in the transition to the side wall of the quiver (30) with a slot (58) which is open at the edge to the side of the support leg (52) facing away from the supporting plate (12), the depth of which is at least the width (56) corresponds to the pressure spring (40) and one longitudinal side of which merges into the recess (50) located in its side wall (30) of the guide sleeve (16). Bürstenhalter nach Anspruch 1, dadurch gekennzeichnet, daß der Führungsköcher (16) an seiner der Tragplatte (12) zugewandten Rückseite (27) mit Biegezungen (28) versehen ist.Brush holder according to claim 1, characterized in that the guide holder (16) is provided with bending tongues (28) on its rear side (27) facing the support plate (12). Bürstenhalter nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Führungsköcher (16) in seiner von der Tragplatte (12) abgewandten Vorderseite (32) einen Durchtrittschlitz (66) für eine mit der Schleifbürste (18) verbundene, im Arbeitsstromkreises Elektromotors liegende Litze (26) aufweist, der zu der vom Kommutator (20) abgewandten Seite des Führungsköchers (16) randoffen ist.Brush holder according to one of claims 1 or 2, characterized in that the guide holder (16) in its front side (32) facing away from the support plate (12) has a passage slot (66) for an electric motor connected to the grinding brush (18) and located in the working circuit Has strand (26) which is open to the edge of the side of the guide sleeve (16) facing away from the commutator (20). Bürstenhalter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Abstützschenkel (52) eine Länge (62) aufweisen, die größer ist als der Radius der Rollen (42) und daß die freien Endabschnitte der Schenkel (52) zu den Rollen (42) hin angebogen sind.Brush holder according to one of claims 1 to 3, characterized in that the support legs (52) have a length (62) which is greater than the radius of the rollers (42) and that the free end portions of the legs (52) to the rollers ( 42) are bent towards it.
EP94102266A 1993-03-10 1994-02-15 Brusch holder for mechanic commutated electric motors Expired - Lifetime EP0615316B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4307451 1993-03-10
DE4307451A DE4307451A1 (en) 1993-03-10 1993-03-10 Brush holder for mechanically commutated electric motors

Publications (3)

Publication Number Publication Date
EP0615316A2 true EP0615316A2 (en) 1994-09-14
EP0615316A3 EP0615316A3 (en) 1994-10-26
EP0615316B1 EP0615316B1 (en) 1997-05-28

Family

ID=6482359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102266A Expired - Lifetime EP0615316B1 (en) 1993-03-10 1994-02-15 Brusch holder for mechanic commutated electric motors

Country Status (4)

Country Link
US (1) US5397952A (en)
EP (1) EP0615316B1 (en)
DE (2) DE4307451A1 (en)
ES (1) ES2102079T3 (en)

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Also Published As

Publication number Publication date
DE59402866D1 (en) 1997-07-03
ES2102079T3 (en) 1997-07-16
US5397952A (en) 1995-03-14
DE4307451A1 (en) 1994-09-15
EP0615316A3 (en) 1994-10-26
EP0615316B1 (en) 1997-05-28

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