EP0455253A2 - Brush holder - Google Patents
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- Publication number
- EP0455253A2 EP0455253A2 EP91107183A EP91107183A EP0455253A2 EP 0455253 A2 EP0455253 A2 EP 0455253A2 EP 91107183 A EP91107183 A EP 91107183A EP 91107183 A EP91107183 A EP 91107183A EP 0455253 A2 EP0455253 A2 EP 0455253A2
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- EP
- European Patent Office
- Prior art keywords
- carbon brush
- shaft
- slope
- brush
- carbon
- 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.)
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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
- H01R39/381—Brush holders characterised by the application of pressure to brush
Definitions
- the invention relates to a brush holder with a carbon brush which can be displaced in a carbon brush shaft, a pressure lever which initiates a force on the carbon brush in the direction of its displacement path and a spring element which on the one hand starts from the pressure lever and on the other hand from a fastening point, the carbon brush resting against at least a carbon brush shaft wall transverse forces can be introduced onto the carbon brush in the area of the foot thereof by means of an element which acts permanently on the side surface of the carbon brush and acts on the carbon brush shaft wall.
- carbon brushes sit in a carbon brush shaft with play. This is particularly disadvantageous if the carbon brushes are associated with motors in which the direction of rotation is reversed, e.g. with washing machine motors or traction motors, so there is a reversing operation. Due to the reversing process, the brush base moves according to the holder play. This shifting is often associated with a tipping process.
- a roller band spring acts on a slope of the brush head and, in addition to the contact pressure, conveys a further force component which acts against the opposite shaft surface.
- the second pressure point is determined by the bracket of the roll belt spring. Due to the design, the lateral forces decrease in the course of wear.
- a roller band spring is rigidly attached to a carbon brush in order to cause both transverse forces to rest the carbon brush against a shaft wall and forces in the direction of the commutator.
- a corresponding construction is clearly disadvantageous, since an exchange of the carbon brush also causes an exchange of the spring. A solution in this regard is therefore negligible solely from a cost perspective.
- a further disadvantage is that the brush tilts in the guide and thus only absorbs the transverse forces in the contact line.
- a roller spring known from DE-A-33 46 595 exerts both pressure on the carbon brush in the direction of the commutator and transverse forces.
- the point of application is quite high in relation to the transverse forces, so that there is an unfavorable moment.
- DE-B 1 488 671 describes a brush holder in which a pivotable lever mounted on a pressure lever is provided for introducing transverse forces into a carbon brush. Separate coil springs each act on the swivel lever and the pressure lever in order to introduce the desired forces into the carbon brush.
- a movable pivot lever for a carbon brush arrangement is known from US-A 2,532,827. According to one embodiment, this assumes a separate shaft.
- a coil spring acts on the swivel lever and acts on a pressure lever at the same time.
- the helical spring itself surrounds a further shaft starting from a mounting plate of the brush holder.
- the present invention is based on the problem of developing a brush holder of the type described at the outset in such a way that it is ensured with structurally simple measures that displacement or tilting of the carbon brush is ruled out, in particular in the case of reversing operation, it being intended to ensure that the transverse forces are introduced in the area of the carbon brush base. It should also be possible to improve the heat dissipation from the carbon brush.
- the element is displaceable along a slope running in the region of an opening of the carbon brush shaft and is directly or indirectly the further attachment point of the spring element.
- the spring element ensures, on the one hand, that the element, which is preferably designed as a rotatable rolling element, strives to be moved along the slope towards the carbon brush, that is to say in the region of the smallest distance between the slope and the carbon brush. This ensures that the element always acts on the carbon brush to such an extent that it bears on the corresponding coal shaft wall on the surface opposite the contact surface. This in turn means that a shifting of the base area of the carbon brush is impossible. As a result, even with a large amount of play between the carbon brush and the carbon brush shaft, it is ensured that there is no tilting.
- the force acting in the direction of the commutator or the slip ring is introduced into the carbon brush via the spring element.
- This construction clearly ensures that the direction of the transverse force is introduced into the carbon brush regardless of the position of the element which acts directly on the carbon brush head surface, that is to say the pressure finger position or the corresponding roller band section.
- the resulting lateral force also remains largely constant.
- the transverse forces can be increased in that the pressure finger rests on a beveled brush head surface, however, as is already known in the prior art.
- At least the interacting surfaces can be designed to be electrically insulated from the further element, such as the roller element and the carbon brush, as a result of which an uncontrolled flow of current is excluded.
- the further element can preferably consist of an electrically insulating material or be coated with such.
- the further element in particular in the form of the roller element which can be rotated about an axis running parallel to the slope, reduces the friction between the carbon brush and the element which causes the transverse forces. A reduction in friction can also be achieved in that the sliding surfaces are designed to reduce friction.
- a brush holder (10) is shown with a structure which is fundamentally known per se, with features designed according to the invention ensuring that transverse forces F act on a carbon brush (12). so that shifting or tilting of the carbon brush (12) is excluded, in particular in a reversing operation.
- the brush holder (10) has a carbon brush shaft (14) which is intended for the carbon brush (12) and through which the carbon brush (12) passes so that it can interact with a commutator (not shown) or with slip rings of an electrical machine for transmitting the current.
- a pressure lever (16) is provided in the exemplary embodiment, the finger (18) of which is on the head surface (20) of the carbon brush (12) acts.
- the head surface (20) is chamfered so that a transverse force in the direction of the arrow F can be caused.
- the pressure lever (16) has bearing journals (22) which can be inserted into receptacles (24) of legs (26) and (28) in order to be able to pivot the pressure lever (16) to the desired extent.
- a tension spring such as a helical spring (30) emanates from the pressure lever (16) and starts from a fastening (32), which in turn indirectly comes from the legs (26) and (28) of the carbon brush holder (10).
- the transverse forces F are intended to cause the carbon brush (12) to bear flat against the inner surface of the wall (34) of the carbon brush shaft (14).
- the carbon brush (12) acts on the carbon brush (12) on the carbon brush (12) to be displaced along an incline (38) in order to produce the transverse force in the foot region (36) ) a.
- the bevel (38) is formed by sections of the legs (26) and (28).
- the fastening (32) for the helical spring (30) runs between the sections of the element (40) designed as cylinders.
- the attachment (32) starts from the shaft (42).
- the shaft (42) and thus the roller element (40) endeavors to be displaced along the slope (38) in the direction of the carbon brush (12), so that in turn the lateral force F in the foot region (36) of the carbon brush (12 ) is introduced such that the carbon brush (12) lies flat against the carbon brush shaft wall (34).
- the slope (38) runs in the region of a recess (44), which lies opposite that wall of the carbon brush shaft on which the carbon brush (12) bears due to the transverse forces F.
- the slope (38) or the leg sections at the free end (46) has a section running parallel to the shaft walls, which ensures that the shaft (42) cannot slide off the slope (38) in an uncontrolled manner.
- At least the areas of the rolling element (40) interacting with the carbon brush (12) can be formed from an electrically insulating material.
- the helical spring element (30) has a double function, namely to pivot the pressure lever (16) and thus the pressure finger (18) towards the carbon brush (12) and to move the element (40) along the slope (38) until there is a firm contact with the surface of the carbon brush (12) opposite the wall (34).
- the lateral forces shown in FIG. 1 marked with the symbol F are introduced into the carbon brush (12), so that movement or tilting within the carbon brush shaft (14) is excluded.
- the direction of the transverse forces F in the area of the foot (36) of the carbon brush (12) is independent of the position of the pressure finger and thus the wear of the carbon brush (12).
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- Motor Or Generator Current Collectors (AREA)
Abstract
Description
Die Erfindung bezieht sich auf einen Bürstenhalter mit einer in einem Kohlebürstenschacht verschiebbaren Kohlebürste, einem auf die Kohlebürste in Richtung ihres Verschiebewegs eine Kraft einleitenden Druckhebel und einem Federelement, das einerseits von dem Druckhebel und andererseits von einem Befestigungspunkt ausgeht, wobei zum Anliegen der Kohlebürste an zumindest einer Kohlebürstenschachtwandung Querkräfte auf die Kohlebürste in Bereich deren Fußes durch ein auf der Kohlebürstenschachtwandung gegenüberliegender Seitenfläche der Kohlebürste einwirkendes, dauernd an der Seitenfläche anliegendes Element einleitbar ist.The invention relates to a brush holder with a carbon brush which can be displaced in a carbon brush shaft, a pressure lever which initiates a force on the carbon brush in the direction of its displacement path and a spring element which on the one hand starts from the pressure lever and on the other hand from a fastening point, the carbon brush resting against at least a carbon brush shaft wall transverse forces can be introduced onto the carbon brush in the area of the foot thereof by means of an element which acts permanently on the side surface of the carbon brush and acts on the carbon brush shaft wall.
Durch Herstellungstoleranzen bedingt sitzen Kohlebürsten mit Spiel in einem Kohlebürstenschacht. Dies ist insbesondere dann nachteilig, wenn die Kohlebürsten Motoren zugeordnet sind, bei denen eine Umkehr der Drehrichtung wie z.B. bei Waschmaschinenmotoren oder Traktionsmotoren erfolgt, also ein Reversierbetrieb gegeben ist. Durch den Reversiervorgang verschiebt sich der Bürstenfuß entsprechend dem Halterspiel. Dieses Verschieben ist häufig mit einem Kippvorgang verbunden.Due to manufacturing tolerances, carbon brushes sit in a carbon brush shaft with play. This is particularly disadvantageous if the carbon brushes are associated with motors in which the direction of rotation is reversed, e.g. with washing machine motors or traction motors, so there is a reversing operation. Due to the reversing process, the brush base moves according to the holder play. This shifting is often associated with a tipping process.
Durch den Kippvorgang bilden sich an der Bürste zwei Laufflächen, die gegeneinander geneigt sind. Dies hat zur Folge, daß die Stromdichte ansteigt und zuweilen unzulässig hohe Werte annimmt. Auch werden die Kommutierungsbedingungen verschlechtert, da die Kommutierungszeit verringert wird.As a result of the tilting process, two treads form on the brush, which face each other are inclined. As a result, the current density rises and sometimes takes impermissibly high values. The commutation conditions also deteriorate because the commutation time is reduced.
Um dieses Verschieben der Kohlebürste beim Reversieren auszuschließen, besteht die Möglichkeit, Fertigungstoleranzen extrem eng zu wählen. Dies würde jedoch zu einer Kostenbelastung führen, die kaum vertretbar ist. Zudem ist insbesondere aufgrund der verschiedenen Materialien und der damit verbundenen unterschiedlichen Ausdehnungskoeffizienten ein Verschieben der Kohlebürste innerhalb des Halterschachtes nicht vollständig auszuschließen.In order to rule out this shifting of the carbon brush when reversing, it is possible to choose extremely tight manufacturing tolerances. However, this would lead to a cost burden that is hardly justifiable. In addition, due to the different materials and the associated different expansion coefficients, a shifting of the carbon brush within the holder shaft cannot be completely ruled out.
Um mit anderen Maßnahmen das Kippen der Kohlebürste auszuschließen, ist nach der DE-A-19 31 104 vorgesehen, daß eine Rollbandfeder auf eine Schräge des Bürstenkopfes einwirkt und dabei neben der Anpreßkraft eine weitere Kraftkomponente vermittelt, die gegen die gegenüberliegende Schachtfläche wirkt. Der zweite Druckpunkt wird von der Halterung der Rollbandfeder festgelegt. Konstruktiv bedingt verringern sich im Laufe der Abnutzung die Querkräfte.In order to exclude the tilting of the carbon brush with other measures, it is provided according to DE-A-19 31 104 that a roller band spring acts on a slope of the brush head and, in addition to the contact pressure, conveys a further force component which acts against the opposite shaft surface. The second pressure point is determined by the bracket of the roll belt spring. Due to the design, the lateral forces decrease in the course of wear.
Nach der DE-A-24 05 754 ist eine Rollbandfeder starr an einer Kohlebürste befestigt, um sowohl Querkräfte zum Anliegen der Kohlebürste an einer Schachtwand als auch Kräfte in Richtung des Kommutators hervorzurufen. Eine entsprechende Konstruktion ist erkennbar nachteilig, da ein Austausch der Kohlebürste gleichfalls einen Austausch der Feder bewirkt. Daher ist eine diesbezügliche Lösung allein aus Kostengesichtspunkten vernachlässigbar. Ferner ist nachteilig, daß ein Verkanten der Bürste in der Führung und damit nur eine Aufnahme der Querkräfte in der Berührungslinie erfolgt.According to DE-A-24 05 754, a roller band spring is rigidly attached to a carbon brush in order to cause both transverse forces to rest the carbon brush against a shaft wall and forces in the direction of the commutator. A corresponding construction is clearly disadvantageous, since an exchange of the carbon brush also causes an exchange of the spring. A solution in this regard is therefore negligible solely from a cost perspective. A further disadvantage is that the brush tilts in the guide and thus only absorbs the transverse forces in the contact line.
Eine aus der DE-A-33 46 595 bekannte Rollbandfeder übt sowohl einen Druck auf die Kohlebürste in Richtung des Kommutators als auch Querkräfte aus. Dabei liegt in bezug auf die Querkräfte der Angriffspunkt recht hoch, so daß sich ein ungünstiges Moment ergibt.A roller spring known from DE-A-33 46 595 exerts both pressure on the carbon brush in the direction of the commutator and transverse forces. The point of application is quite high in relation to the transverse forces, so that there is an unfavorable moment.
In der DE-B 1 488 671 wird ein Bürstenhalter beschrieben, bei dem zur Einleitung von Querkräften in eine Kohlebürste ein schwenkbarer, an einem Druckhebel gelagerter Hebel vorgesehen ist. Auf den Schwenkhebel und den Druckhebel wirken jeweils gesonderte Schraubenfedern ein, um gewünschte Kräfte in die Kohlebürste einzuleiten.DE-B 1 488 671 describes a brush holder in which a pivotable lever mounted on a pressure lever is provided for introducing transverse forces into a carbon brush. Separate coil springs each act on the swivel lever and the pressure lever in order to introduce the desired forces into the carbon brush.
Ein beweglicher Schwenkhebel für eine Kohlebürstenanordnung ist aus der US-A 2,532,827 bekannt. Dieser geht nach einem Ausführungsbeispiel von einer gesonderten Welle aus. Auf den Schwenkhebel wirkt eine Schraubenfeder, die gleichzeitig auf einen Druckhebel einwirkt. Die Schraubenfeder selber umgibt eine von einer Befestigungsplatte des Bürstenhalters ausgehende weitere Welle.A movable pivot lever for a carbon brush arrangement is known from US-A 2,532,827. According to one embodiment, this assumes a separate shaft. A coil spring acts on the swivel lever and acts on a pressure lever at the same time. The helical spring itself surrounds a further shaft starting from a mounting plate of the brush holder.
Der vorliegenden Erfindung liegt das Problem zugrunde, einen Bürstenhalter der eingangs beschriebenen Art so weiterzubilden, daß mit konstruktiv einfachen Maßnahmen sichergestellt ist, daß insbesondere bei einem Reversierbetrieb ein Verschieben bzw. Kippen der Kohlebürste ausgeschlossen ist, wobei gewährleistet sein soll, daß das Einleiten der Querkräfte im Bereich des Kohlebürstenfußes erfolgt. Auch soll eine Verbesserung der Wärmeableitung von der Kohlebürste möglich sein.The present invention is based on the problem of developing a brush holder of the type described at the outset in such a way that it is ensured with structurally simple measures that displacement or tilting of the carbon brush is ruled out, in particular in the case of reversing operation, it being intended to ensure that the transverse forces are introduced in the area of the carbon brush base. It should also be possible to improve the heat dissipation from the carbon brush.
Das Problem wird erfindungsgemäß dadurch gelöst, daß das Element entlang einer im Bereich einer Öffnung des Kohlebürstenschachtes verlaufenden Schräge verschiebbar ist und mittelbar oder unmittelbar der weitere Befestigungspunkt des Federelementes ist.The problem is solved according to the invention in that the element is displaceable along a slope running in the region of an opening of the carbon brush shaft and is directly or indirectly the further attachment point of the spring element.
Durch das Federelement wird zum einen sichergestellt, daß das vorzugsweise als drehbares Rollelement ausgebildete Element bestrebt ist, entlang der Schräge zu der Kohlebürste hin bewegt zu werden, also in den Bereich des geringsten Abstands von Schräge und Kohlebürste. Hierdurch ist sichergestellt, daß das Element stets in einem Umfang auf die Kohlebürste einwirkt, daß diese auf der der Angriffsfläche gegenüberliegenden Fläche an der entsprechenden Kohleschachtwandung anliegt. Dies wiederum bedeutet, daß ein Verschieben des Fußbereichs der Kohlebürste ausgeschlossen ist. Folglich ist auch bei großem Spiel zwischen Kohlebürste und Kohlebürstenschacht sichergestellt, daß ein Kippen unterbleibt.The spring element ensures, on the one hand, that the element, which is preferably designed as a rotatable rolling element, strives to be moved along the slope towards the carbon brush, that is to say in the region of the smallest distance between the slope and the carbon brush. This ensures that the element always acts on the carbon brush to such an extent that it bears on the corresponding coal shaft wall on the surface opposite the contact surface. This in turn means that a shifting of the base area of the carbon brush is impossible. As a result, even with a large amount of play between the carbon brush and the carbon brush shaft, it is ensured that there is no tilting.
Zum anderen wird über das Federelement die in Richtung auf den Kommutator oder den Schleifring wirkende Kraft in die Kohlebürste eingeleitet. Erkennbar stellt diese Konstruktion sicher, daß die Richtung der Querkraft unabhängig von der Stellung des Elementes, das unmittelbar auf die Kohlebürstenkopffläche einwirkt, also der Druckfingerstellung oder des entsprechenden Rollbandabschnittes, in die Kohlebürste eingeleitet wird. Auch bleibt weitgehend die resultierende Querkraft konstant.On the other hand, the force acting in the direction of the commutator or the slip ring is introduced into the carbon brush via the spring element. This construction clearly ensures that the direction of the transverse force is introduced into the carbon brush regardless of the position of the element which acts directly on the carbon brush head surface, that is to say the pressure finger position or the corresponding roller band section. The resulting lateral force also remains largely constant.
Verstärkt können die Querkräfte dadurch werden, daß der Druckfinger auf einer abgeschrägten Bürstenkopffläche aufliegt, wie es jedoch bereits nach dem Stand der Technik bekannt ist.The transverse forces can be increased in that the pressure finger rests on a beveled brush head surface, however, as is already known in the prior art.
In weiterer Ausgestaltung der Erfindung können zumindest die aufeinanderwirkenden Flächen von dem weiteren Element wie dem Rollenelement und der Kohlebürste elektrisch isoliert ausgebildet sein, wodurch ein unkontrollierter Stromfluß ausgeschlossen ist. Dabei kann vorzugsweise das weitere Element aus einem elektrisch isolierenden Material bestehen oder mit einem solchen beschichtet sein. Durch das weitere Element, insbesondere in Form des um eine parallel zur Schräge verlaufende Achse drehbaren Rollenelementes wird die Reibung zwischen der Kohlebürste und dem die Querkräfte hervorrufenden Element reduziert. Eine Reibungsverminderung kann zusätzlich dadurch erreicht werden, daß die aufeinandergleitenden Flächen reibungsmindernd ausgebildet sind.In a further embodiment of the invention, at least the interacting surfaces can be designed to be electrically insulated from the further element, such as the roller element and the carbon brush, as a result of which an uncontrolled flow of current is excluded. The further element can preferably consist of an electrically insulating material or be coated with such. The further element, in particular in the form of the roller element which can be rotated about an axis running parallel to the slope, reduces the friction between the carbon brush and the element which causes the transverse forces. A reduction in friction can also be achieved in that the sliding surfaces are designed to reduce friction.
Weitere Einzelheiten, Vorteile und Merkmale der Erfindung ergeben sich nicht nur aus den Ansprüchen und den diesen zu entnehmenden Merkmalen - für sich und/oder in Kombination -, sondern auch aus der nachfolgenden Beschreibung eines der Zeichnung zu entnehmenden bevorzugten Ausführungsbeispiels.Further details, advantages and features of the invention result not only from the claims and the features to be extracted from them - individually and / or in combination - but also from the following description of a preferred exemplary embodiment which can be seen from the drawing.
Es zeigen:
- Fig. 1
- eine Seitenansicht eines Bürstenhalters,
- Fig. 2
- eine Detaildarstellung des Bürstenhalters nach Fig. 1 und
- Fig. 3
- eine Rückansicht des Ausschnitts des Bürstenhalters nach Fig. 2.
- Fig. 1
- a side view of a brush holder,
- Fig. 2
- a detailed view of the brush holder of FIG. 1 and
- Fig. 3
- 3 shows a rear view of the detail of the brush holder according to FIG. 2.
In den Figuren, in denen gleiche Elemente mit gleichen Bezugszeichen versehen sind, ist ein Bürstenhalter (10) mit einem grundsätzlich an und für sich bekannten Aufbau dargestellt, wobei mittels erfindungsgemäß ausgebildeter Merkmale sichergestellt ist, daß auf eine Kohlebürste (12) Querkräfte F einwirken, so daß insbesondere bei einem Reversierbetrieb ein Verschieben bzw. Verkippen der Kohlebürste (12) ausgeschlossen ist.In the figures, in which the same elements are provided with the same reference numerals, a brush holder (10) is shown with a structure which is fundamentally known per se, with features designed according to the invention ensuring that transverse forces F act on a carbon brush (12). so that shifting or tilting of the carbon brush (12) is excluded, in particular in a reversing operation.
Der Bürstenhalter (10) weist einen für die Kohlebürste (12) bestimmten Kohlebürstenschacht (14) auf, der von der Kohlebürste (12) durchsetzt wird, damit diese mit einem nicht dargestellten Kommutator oder mit Schleifringen einer elektrischen Maschine zur Übertragung des Stromes wechselwirken kann.The brush holder (10) has a carbon brush shaft (14) which is intended for the carbon brush (12) and through which the carbon brush (12) passes so that it can interact with a commutator (not shown) or with slip rings of an electrical machine for transmitting the current.
Sind in der Zeichnung die Abmessungen der Kohlebürste (12) und des Kohlebürstenschachtes (14) so dargestellt, daß eine paßgenaue Aufnahme gegeben ist, so ist dies kein zwingendes Merkmal. Vielmehr kann ein erhebliches Spiel zwischen der Kohlebürste (12) und den Innenwandungen des Kohlebürstenschachtes (14) bestehen, ohne daß erwähntermaßen die Gefahr eines Verschiebens bzw. Verkippens der Kohlebürste (12) besteht.If the dimensions of the carbon brush (12) and the carbon brush shaft (14) are shown in the drawing in such a way that a precisely fitting receptacle is given, this is not a mandatory feature. Rather, there can be considerable play between the carbon brush (12) and the inner walls of the carbon brush shaft (14) without the risk of the carbon brush (12) shifting or tilting.
Damit auf die Kohlebürste (12) in Richtung des Kommutators bzw. Schleifringes eine in Längsrichtung der Kohlebürste (12) gerichtete Kraft einwirken kann, ist im Ausführungsbeispiel ein Druckhebel (16) vorgesehen, dessen Finger (18) auf die Kopffläche (20) der Kohlebürste (12) einwirkt. Im Ausführungsbeispiel ist die Kopffläche (20) angeschrägt, damit eine Querkraft in Richtung des Pfeiles F hervorgerufen werden kann. Der Druckhebel (16) weist Lagerzapfen (22) auf, die in Aufnahmen (24) von Schenkeln (26) und (28) einbringbar sind, um so den Druckhebel (16) im gewünschten Umfang verschwenken zu können.So that a force directed in the longitudinal direction of the carbon brush (12) can act on the carbon brush (12) in the direction of the commutator or slip ring, a pressure lever (16) is provided in the exemplary embodiment, the finger (18) of which is on the head surface (20) of the carbon brush (12) acts. In the exemplary embodiment, the head surface (20) is chamfered so that a transverse force in the direction of the arrow F can be caused. The pressure lever (16) has bearing journals (22) which can be inserted into receptacles (24) of legs (26) and (28) in order to be able to pivot the pressure lever (16) to the desired extent.
Damit der Finger (18) auf der Kopffläche (20) kraftschlüssig aufliegt, geht von dem Druckhebel (16) eine Zugfeder wie Schraubenfeder (30) aus, die von einer Befestigung (32) ausgeht, die ihrerseits mittelbar von den Schenkeln (26) und (28) der Kohlebürstenhalterung (10) ausgeht.So that the finger (18) rests non-positively on the head surface (20), a tension spring such as a helical spring (30) emanates from the pressure lever (16) and starts from a fastening (32), which in turn indirectly comes from the legs (26) and (28) of the carbon brush holder (10).
Die Querkräfte F sollen bewirken, daß die Kohlebürste (12) an der Innenfläche der Wandung (34) des Kohlebürstenschachtes (14) flächig anliegt.The transverse forces F are intended to cause the carbon brush (12) to bear flat against the inner surface of the wall (34) of the carbon brush shaft (14).
Wird die im Kopfbereich hervorgerufene Querkraft F durch den Druckfinger (18) eingeleitet, so wirkt zur Hervorrufung der Querkraft im Fußbereich (36) der Kohlebürste (12) auf diese ein entlang einer Schräge (38) verschiebbares Rollelement (40) auf die Kohlebürste (12) ein. Die Schräge (38) wird von Abschnitten der Schenkel (26) und (28) gebildet. Entlang dieser schräg verlaufenden Schenkelabschnitte, also der Schräge (38) verläuft ein Zapfen oder eine Welle (42), die von Abschnitten des Elementes (40) umgeben ist, wie insbesondere die Darstellung der Fig. 3 verdeutlicht.If the transverse force F caused in the head region is introduced by the pressure finger (18), the carbon brush (12) acts on the carbon brush (12) on the carbon brush (12) to be displaced along an incline (38) in order to produce the transverse force in the foot region (36) ) a. The bevel (38) is formed by sections of the legs (26) and (28). A pin or a shaft (42), which is surrounded by sections of the element (40), runs along these inclined leg sections, that is to say the bevel (38), as is particularly illustrated by the illustration in FIG. 3.
Zwischen den als Zylinder ausgebildeten Abschnitten des Elementes (40) verläuft die Befestigung (32) für die Schraubenfeder (30). Mit anderen Worten geht die Befestigung (32) von der Welle (42) aus. Hierdurch bedingt ist die Welle (42) und damit das Rollenelement (40) bestrebt, entlang der Schräge (38) in Richtung der Kohlebürste (12) verschoben zu werden, so daß hierdurch wiederum die Querkraft F im Fußbereich (36) der Kohlebürste (12) derart eingeleitet wird, daß die Kohlebürste (12) flächig an der Kohlebürstenschachtwandung (34) anliegt.The fastening (32) for the helical spring (30) runs between the sections of the element (40) designed as cylinders. In other words, the attachment (32) starts from the shaft (42). As a result, the shaft (42) and thus the roller element (40) endeavors to be displaced along the slope (38) in the direction of the carbon brush (12), so that in turn the lateral force F in the foot region (36) of the carbon brush (12 ) is introduced such that the carbon brush (12) lies flat against the carbon brush shaft wall (34).
Die Schräge (38) verläuft im Bereich einer Aussparung (44), die derjenigen Kohlebürstenschachtwandung gegenüberliegt, an der die Kohlebürste (12) durch die Querkräfte F bedingt anliegt.The slope (38) runs in the region of a recess (44), which lies opposite that wall of the carbon brush shaft on which the carbon brush (12) bears due to the transverse forces F.
Ferner weist die Schräge (38) bzw. die Schenkelabschnitte am freien Ende (46) einen parallel zu den Schachtwandungen verlaufenden Abschnitt auf, durch den sichergestellt ist, daß die Welle (42) nicht unkontrolliert von der Schräge (38) abrutschen kann.Furthermore, the slope (38) or the leg sections at the free end (46) has a section running parallel to the shaft walls, which ensures that the shaft (42) cannot slide off the slope (38) in an uncontrolled manner.
Zumindest die mit der Kohlebürste (12) wechselwirkenden Bereiche des Rollelementes (40) können aus einem elektrisch isolierenden Material ausgebildet sein.At least the areas of the rolling element (40) interacting with the carbon brush (12) can be formed from an electrically insulating material.
Erkennbar übt das Schraubenfederelement (30) eine Doppelfunktion aus, nämlich zum einen den Druckhebel (16) und damit den Druckfinger (18) zur Kohlebürste (12) zu verschwenken und zum anderen das Element (40) derart entlang der Schräge (38) zu bewegen, bis ein festes Anliegen an der der Wandung (34) gegenüberliegenden Fläche der Kohlebürste (12) erfolgt. Hierdurch werden die in der Fig. 1 dargestellten mit dem Symbol F gekennzeichneten Querkräfte in die Kohlebürste (12) eingeleitet, so daß ein Bewegen bzw. Kippen innerhalb des Kohlebürstenschachtes (14) ausgeschlossen ist. Gleichzeitig wird erkennbar, daß die Richtung der Querkräfte F im Bereich des Fußes (36) der Kohlebürste (12) unabhängig von der Stellung des Druckfingers und damit des Verschleisses der Kohlebürste (12) ist.As can be seen, the helical spring element (30) has a double function, namely to pivot the pressure lever (16) and thus the pressure finger (18) towards the carbon brush (12) and to move the element (40) along the slope (38) until there is a firm contact with the surface of the carbon brush (12) opposite the wall (34). As a result, the lateral forces shown in FIG. 1 marked with the symbol F are introduced into the carbon brush (12), so that movement or tilting within the carbon brush shaft (14) is excluded. At the same time it can be seen that the direction of the transverse forces F in the area of the foot (36) of the carbon brush (12) is independent of the position of the pressure finger and thus the wear of the carbon brush (12).
Claims (6)
dadurch gekennzeichnet,
daß das Element (40) entlang einer im Bereich einer Öffnung des Kohlebürstenschachtes (14) verlaufenden Schräge (38) verschiebbar ist und mittelbar oder unmittelbar der weitere Befestigungspunkt (32) des Federelementes (30) ist.Brush holder (10) with a carbon brush (12) which can be displaced in a carbon brush shaft (14), a pressure lever (16) which initiates a force on the carbon brush in the direction of its displacement and a spring element (30) which is on the one hand from the pressure lever and on the other hand from a fastening point (32), with transverse forces (F) on the carbon brush in the area of the foot thereof being able to be introduced to the carbon brush against at least one carbon brush shaft wall (34) by means of an element (40) permanently applied to the side surface of the carbon brush acting on the carbon brush shaft wall ,
characterized,
that the element (40) is displaceable along a slope (38) running in the region of an opening of the carbon brush shaft (14) and is directly or indirectly the further attachment point (32) of the spring element (30).
dadurch gekennzeichnet,
daß das Element (40) ein um eine parallel zu der Schräge (38) verlaufendes und zu dieser verschiebbare Achse (42) drehbares Rollelement ist.Device according to claim 1,
characterized,
that the element (40) is a rolling element which is rotatable about an axis (42) which runs parallel to the slope (38) and is displaceable relative to the latter.
dadurch gekennzeichnet,
daß das Rollelement (40) eine sich an der Schräge (38) abstützende Welle (42) umgibt, von der das Federelement (30) ausgeht.Device according to at least claim 1,
characterized,
that the rolling element (40) surrounds a shaft (42) which is supported on the slope (38) and from which the spring element (30) extends.
dadurch gekennzeichnet,
daß die Schräge (38) freie Flächen von Schenkeln (26,28) einer Bürstenhalterung (10) sind, die den Kohlebürstenschacht (14) als integralen Teil aufweist.Device according to at least claim 1,
characterized,
that the slope (38) are free surfaces of legs (26, 28) of a brush holder (10) which has the carbon brush shaft (14) as an integral part.
dadurch gekennzeichnet,
daß das Element (40) in den mit der Kohlebürste (12) wechselwirkenden Bereichen aus elektrisch isolierendem Material besteht oder mit diesem versehen ist.Device according to at least claim 1,
characterized,
that the element (40) in the areas interacting with the carbon brush (12) consists of or is provided with electrically insulating material.
dadurch gekennzeichnet,
daß die miteinander wechselwirkenden Flächen von der Kohlebürste (12) und dem Element (40) zumindest bereichsweise reibungsmindernd ausgebildet sind.Device according to at least claim 1,
characterized,
that the interacting surfaces of the carbon brush (12) and the element (40) are designed to reduce friction, at least in some areas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4014300 | 1990-05-04 | ||
| DE4014300A DE4014300A1 (en) | 1990-05-04 | 1990-05-04 | DEVICE FOR TRANSMITTING FLOWS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0455253A2 true EP0455253A2 (en) | 1991-11-06 |
| EP0455253A3 EP0455253A3 (en) | 1992-07-29 |
| EP0455253B1 EP0455253B1 (en) | 1995-03-15 |
Family
ID=6405691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91107183A Expired - Lifetime EP0455253B1 (en) | 1990-05-04 | 1991-05-03 | Brush holder |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0455253B1 (en) |
| DE (2) | DE4014300A1 (en) |
| ES (1) | ES2071855T3 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0851541A1 (en) * | 1996-12-27 | 1998-07-01 | Mitsuba Corporation | Brush holder device |
| EP0884810A2 (en) * | 1997-06-13 | 1998-12-16 | Itt Manufacturing Enterprises, Inc. | Carbon brush for electrical machines |
| CN114123674A (en) * | 2021-11-30 | 2022-03-01 | 江苏汇博机器人技术股份有限公司 | Electric automation equipment overhauls protector |
| CN114792918A (en) * | 2022-03-31 | 2022-07-26 | 华能伊敏煤电有限责任公司 | Stable-contact high-low voltage ring electric brush |
| US11545868B2 (en) * | 2020-05-29 | 2023-01-03 | Audi Ag | Electric motor, in particular a separately excited synchronous motor |
| CN115663550A (en) * | 2022-09-07 | 2023-01-31 | 中国科学院电工研究所 | Pressure-adjustable carbon brush pressing mechanism |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011085997A1 (en) * | 2011-11-09 | 2013-05-16 | Robert Bosch Gmbh | Vibration-reduced brush holder for an electric motor |
| BR102019021921A2 (en) * | 2019-10-18 | 2020-02-11 | Mersen Do Brasil Ltda. | BRUSH HOLDER FOR ELECTRIC DRIVE MOTORS FOR LOCOMOTIVES |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2532827A (en) * | 1949-12-03 | 1950-12-05 | Gen Electric | Brush rigging |
| DE1488671A1 (en) * | 1965-05-11 | 1969-06-19 | Lorraine Carbone | Brush holder for current collectors of electrical machines |
| DE3346595A1 (en) * | 1983-12-23 | 1985-07-04 | Frost Masch & App Max | BRUSH HOLDER FOR ELECTRICAL MACHINES |
| US4602181A (en) * | 1984-11-05 | 1986-07-22 | Wolfgang Dietrich | Brush holder assembly for use in electric machines |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1269403A (en) * | 1968-06-21 | 1972-04-06 | Gen Electric | Improvements in brush holding arrangements in dynamoelectric machines |
| FR2217828B1 (en) * | 1973-02-08 | 1978-08-04 | Ferraz & Cie Lucien |
-
1990
- 1990-05-04 DE DE4014300A patent/DE4014300A1/en active Granted
-
1991
- 1991-05-03 ES ES91107183T patent/ES2071855T3/en not_active Expired - Lifetime
- 1991-05-03 EP EP91107183A patent/EP0455253B1/en not_active Expired - Lifetime
- 1991-05-03 DE DE59104929T patent/DE59104929D1/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2532827A (en) * | 1949-12-03 | 1950-12-05 | Gen Electric | Brush rigging |
| DE1488671A1 (en) * | 1965-05-11 | 1969-06-19 | Lorraine Carbone | Brush holder for current collectors of electrical machines |
| DE3346595A1 (en) * | 1983-12-23 | 1985-07-04 | Frost Masch & App Max | BRUSH HOLDER FOR ELECTRICAL MACHINES |
| US4602181A (en) * | 1984-11-05 | 1986-07-22 | Wolfgang Dietrich | Brush holder assembly for use in electric machines |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0851541A1 (en) * | 1996-12-27 | 1998-07-01 | Mitsuba Corporation | Brush holder device |
| US6031313A (en) * | 1996-12-27 | 2000-02-29 | Mitsuba Corporation | Brush holder device |
| EP0884810A2 (en) * | 1997-06-13 | 1998-12-16 | Itt Manufacturing Enterprises, Inc. | Carbon brush for electrical machines |
| EP0884810A3 (en) * | 1997-06-13 | 2000-01-12 | Itt Manufacturing Enterprises, Inc. | Carbon brush for electrical machines |
| US11545868B2 (en) * | 2020-05-29 | 2023-01-03 | Audi Ag | Electric motor, in particular a separately excited synchronous motor |
| CN114123674A (en) * | 2021-11-30 | 2022-03-01 | 江苏汇博机器人技术股份有限公司 | Electric automation equipment overhauls protector |
| CN114123674B (en) * | 2021-11-30 | 2023-12-01 | 江苏汇博机器人技术股份有限公司 | Electric automatization equipment overhauls protector |
| CN114792918A (en) * | 2022-03-31 | 2022-07-26 | 华能伊敏煤电有限责任公司 | Stable-contact high-low voltage ring electric brush |
| CN114792918B (en) * | 2022-03-31 | 2023-05-23 | 华能伊敏煤电有限责任公司 | High-low voltage ring brush with stable contact |
| CN115663550A (en) * | 2022-09-07 | 2023-01-31 | 中国科学院电工研究所 | Pressure-adjustable carbon brush pressing mechanism |
| CN115663550B (en) * | 2022-09-07 | 2023-12-08 | 中国科学院电工研究所 | Carbon brush hold-down mechanism with adjustable pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4014300A1 (en) | 1991-11-14 |
| DE4014300C2 (en) | 1992-06-17 |
| DE59104929D1 (en) | 1995-04-20 |
| EP0455253B1 (en) | 1995-03-15 |
| EP0455253A3 (en) | 1992-07-29 |
| ES2071855T3 (en) | 1995-07-01 |
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