EP2279058B1 - Machine tool having an electric drive motor - Google Patents

Machine tool having an electric drive motor Download PDF

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Publication number
EP2279058B1
EP2279058B1 EP09733179A EP09733179A EP2279058B1 EP 2279058 B1 EP2279058 B1 EP 2279058B1 EP 09733179 A EP09733179 A EP 09733179A EP 09733179 A EP09733179 A EP 09733179A EP 2279058 B1 EP2279058 B1 EP 2279058B1
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EP
European Patent Office
Prior art keywords
air guide
machine tool
flow path
tool according
flow
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EP09733179A
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German (de)
French (fr)
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EP2279058A1 (en
Inventor
Rainer Vollmer
Marcus Schuller
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means

Definitions

  • the invention relates to a machine tool, in particular a hand tool with electric drive motor according to the preamble of claim 1.
  • Hand tool machines with electric drive motor such as angle grinder, have for cooling the motor on a fan in the housing, which is driven by the motor and generates a cooling air flow, which is passed through the housing of the power tool. Since, during operation of the hand tool machine, abrasive particles of dirt are produced during the machining of a workpiece, which are conducted into the housing interior via the cooling air flow, there is the risk of contamination of the drive motor and of other machine tool parts located in the housing.
  • the abrasive particles can be deposited in the housing and, for example, lead to wear on the pole piece winding heads of the electric drive motor, which can cause a short circuit with a concomitant malfunction.
  • the dirt particles increase the friction and worsen the cooling performance of the cooling air flow, whereby the heat dissipation is reduced.
  • a machine tool according to the preamble of claim 1 is known with an electric drive motor having pole pieces for conducting a magnetic field. Furthermore, a fan wheel is provided for generating a cooling air flow to be conducted through a housing of the machine tool, wherein an air guide element in the housing forms a section of the flow path of the cooling air flow. The air guide partially covers the pole pieces, the pole shoes being outside the flow path of the cooling air flow.
  • the invention is based on the object to ensure the functionality of a machine tool over a long period of operation.
  • the embodiment of the invention is suitable for use in machine tools, in particular in hand tool machines with electric drive motor, preferably electric hand tools, which are used for grinding or other machining.
  • the electric drive motor used is preferably an alternating-current motor, in particular a series-wound motor.
  • a DC motor such as a permanent-magnet motor may be used.
  • the electric drive motor has pole pieces for improved conduction of the magnetic field, also the drive motor is associated with a fan, which is driven by the armature shaft of the drive motor and via which a cooling air flow for cooling the motor and other components of the machine tool is generated.
  • the cooling air flow is introduced into the housing of the machine tool, guided past the drive motor and discharged via outlet openings again from the housing.
  • an air guide element is provided in the housing, which is preferably arranged on an end face of the electric motor and forms a portion of the flow path of the cooling air flow within the housing.
  • the air guiding element covers the pole shoes at least partially, so that the relevant section of the pole shoes is outside the flow path of the cooling air flow.
  • This design has the advantage that the pole pieces are protected from the abrasive particles of dirt carried in the cooling air flow.
  • the abrasive dust can not adhere to the pole shoes, in particular to the winding heads of the pole shoes deposit.
  • the pole pieces are mechanically protected against contamination via the air guide element.
  • a further advantage lies in the optimized flow course, in particular in the region of the pole shoes, since the air guide element also forms part of the flow path of the cooling air flow, in addition to protecting the pole shoes, it being possible to influence the flow via the shape of the air guide element.
  • air turbulence in the region of the pole shoes are avoided, which are arranged on the side facing away from the flow path of the air guide element. Since disturbing influences on the flow path omitted or at least reduced, which are associated with pressure differences, a more pleasant sound image is achieved because in the flow no high frequencies and even lower amplitudes are generated.
  • the air guide element has a pole shoe receiving section receiving the front side of the pole shoes and lying outside the flow path of the cooling air flow.
  • the air guide element is preferably designed as an air guide ring, wherein the Polschuhabilityabites expediently forms an annular space which lies radially outside of a cylindrical Beerleitstutzens, which is part of the air guide ring.
  • the air duct defines on one side the flow path of the cooling air flow and on the opposite side of its wall, the pole pieces, which are covered by the nozzle.
  • the pole shoes are located radially outside the flow path, so that the annular space formed as Polschuhabilityabêt in the air guide is also outside the flow path.
  • the cooling air flow between the armature of the preferably designed as an internal rotor motor electric motor and the stator is guided axially through the motor.
  • this air duct both the stator and the armature or rotor parts of the electric motor are cooled.
  • At least one flow blade which projects into the flow path and which is directed in particular radially to the flow path in order to achieve an improved or, in a certain way, desired flow guidance, is formed on the air guide element.
  • the flow blade can in this case form a solid, non-variable component of the air guide ring, or, according to an alternative embodiment, be movably held on the air guide element, for example via a film hinge or the like.
  • the flow nozzle in the air guide is used in particular for receiving the fan wheel, which is arranged coaxially to the armature or rotor shaft of the electric motor and rotatably connected to the rotor.
  • the flow nozzle communicates with the receiving space in the air guide, in which the fan is rotatably mounted.
  • Air guide and fan wheel thus form a structural unit, creating a so-called impeller, ie an encapsulated propeller.
  • a hand tool machine 1 shown in a general way, in a housing 2 to an electric drive motor 3, which is designed in particular as an AC motor, preferably as a series motor, optionally also a DC motor is suitable.
  • the rotor or armature shaft 4 of the drive motor 3 is rotationally coupled to a rotatably mounted in the housing tool shaft 5 and drives them, on the tool shaft 5 is a tool 6 for machining a workpiece.
  • the electric drive motor 3 pole pieces 7, which are designed in particular as a winding heads and form part of the stator of the drive motor. Furthermore, a pole piece 7 annular enclosing return part 8 is present, which may possibly also have permanent magnets.
  • an air guide ring 9 Coaxially with the rotor shaft or armature shaft 11 of the drive motor, an air guide ring 9, in which an only symbolically registered fan wheel rotates rotatably, which is non-rotatably coupled to the shaft 11, is located on one end side of the electric drive motor 3.
  • the air guide ring 9 surrounds the fan 10, both components together form an impeller.
  • the air guide ring 9 a radially tapered and extending in the axial direction
  • the air duct 12 serves to guide the flow of cooling air, which is guided through the housing of the power tool and is passed axially in particular in the radial region between armature and stator of the electric motor.
  • the air duct 12 forms part of the flow path for the cooling air flow.
  • annular space 13 in the air guide ring 9 for receiving the end face of the pole pieces 7 is formed radially outside of the cylindrical Lucasleitstutzens 12.
  • the annular space 13 forms a Polschuh techniqueabêt and is bounded radially inwardly by the wall of the Lucasleitstutzens 12 and radially outwardly by a further wall 14 which is integrally formed or integrally with the air guide ring 9.
  • the flow path 15 opens into the air duct 12 of the air guide ring 9. In this way, the cooling air flow flows through the drive motor 3 over its axial length and is axially beyond the open end face, which the air duct 12 is opposite, derived from the air guide ring 9.
  • Fig. 5 is the air guide 9 again shown in perspective detail.
  • the air duct 12 which has based on the outer diameter of the air guide ring 9 about half the diameter.
  • the air duct 12 In the axial direction of Heilleitstutzen 12 takes a maximum of half the length of the entire axial extent of the air guide ring 9 a.
  • FIG. 6 an air guide ring 9 is shown in a modified embodiment.
  • Integrally formed with the flow nozzle 12 are two diametrically opposed, radially outwardly opening flow blades 17 which form part of the wall of the Lucasleitstutzens 12, but are widened with respect to the cylinder wall with a radial component and extend outwardly.
  • the flow blades 17 open in the direction of the annular space 13, which serves to receive the pole pieces.
  • a flow path is released between the interior of the Lucasleitstutzens 12 as part of the flow path and the annular space 13, so that a partial flow of the cooling air flow through the open flow blades 17 can enter radially into the annular space 13 and provides additional cooling of the pole pieces.
  • the flow blades 17 are optionally designed to be movable and to be adjusted between the illustrated open position and a closed position in which the flow blades 17 are in the wall of the Lucasleitstutzens 12, so that no radial transfer of cooling air is possible.
  • the pivoting mobility of the flow blades 17 may be formed for example via a film hinge, via which the flow guide vanes are connected to the wall of the Lucasleitstutzens 12. In principle, however, a firm, immobile training of the flow blades 17 is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Portable Power Tools In General (AREA)

Abstract

A machine tool, in particular a powered hand tool, has an electric drive motor to which pole shoes are assigned in order to conduct a magnetic field. Furthermore, a fan wheel is provided in order to produce a stream of cooling air. In the housing, an air-guiding element forms a portion of the flow path for the stream of cooling air. According to the invention, the air-guiding element at least partially covers the pole shoes.

Description

Die Erfindung bezieht sich auf eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine mit elektrischem Antriebsmotor nach dem Oberbegriff des Anspruches 1.The invention relates to a machine tool, in particular a hand tool with electric drive motor according to the preamble of claim 1.

Stand der TechnikState of the art

Handwerkzeugmaschinen mit elektrischem Antriebsmotor, beispielsweise Winkelschleifer, weisen zur Kühlung des Motors ein Lüfterrad im Gehäuse auf, das vom Motor angetrieben wird und einen Kühlluftstrom erzeugt, der durch das Gehäuse der Handwerkzeugmaschine geleitet wird. Da im Betrieb der Handwerkzeugmaschine bei der Bearbeitung eines Werkstückes abrasive Schmutzpartikel entstehen, die über den Kühlluftstrom in das Gehäuseinnere geleitet werden, besteht die Gefahr der Verschmutzung des Antriebsmotors sowie sonstiger im Gehäuse befindlicher Werkzeugmaschinenteile. Die abrasiven Partikel können sich im Gehäuse ablagern und beispielsweise zu einem Verschleiß an Polschuh-Wickelköpfen des elektrischen Antriebsmotors führen, was einen Kurzschluss mit einhergehendem Funktionsausfall auslösen kann. Außerdem erhöhen die Schmutzpartikel die Reibung und verschlechtern die Kühlleistung des Kühlluftstromes, wodurch die Wärmeableitung herabgesetzt wird.Hand tool machines with electric drive motor, such as angle grinder, have for cooling the motor on a fan in the housing, which is driven by the motor and generates a cooling air flow, which is passed through the housing of the power tool. Since, during operation of the hand tool machine, abrasive particles of dirt are produced during the machining of a workpiece, which are conducted into the housing interior via the cooling air flow, there is the risk of contamination of the drive motor and of other machine tool parts located in the housing. The abrasive particles can be deposited in the housing and, for example, lead to wear on the pole piece winding heads of the electric drive motor, which can cause a short circuit with a concomitant malfunction. In addition, the dirt particles increase the friction and worsen the cooling performance of the cooling air flow, whereby the heat dissipation is reduced.

Aus der EP 0 023 609 A1 ist eine Werkzeugmaschine nach dem Oberbegriff des Anspruchs 1 mit einem elektrischen Antriebsmotor bekannt, der Polschuhe zur Leitung eines Magnetfeldes aufweist. Des Weiteren ist ein Lüfterrad zur Erzeugung eines durch ein Gehäuse der Werkzeugmaschine zu leitenden Kühlluftstroms vorgesehen, wobei ein Luftleitelement im Gehäuse einen Abschnitt des Strömungswegs des Kühlluftstroms bildet. Das Luftleitelement verdeckt die Polschuhe teilweise, wobei die Polschuhe außerhalb des Strömungswegs des Kühlluftstroms liegen.From the EP 0 023 609 A1 a machine tool according to the preamble of claim 1 is known with an electric drive motor having pole pieces for conducting a magnetic field. Furthermore, a fan wheel is provided for generating a cooling air flow to be conducted through a housing of the machine tool, wherein an air guide element in the housing forms a section of the flow path of the cooling air flow. The air guide partially covers the pole pieces, the pole shoes being outside the flow path of the cooling air flow.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zu Grunde, die Funktionstüchtigkeit einer Werkzeugmaschine über einen langen Betriebszeitraum sicherzustellen.The invention is based on the object to ensure the functionality of a machine tool over a long period of operation.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbildungen an.This object is achieved with the features of claim 1. The dependent claims indicate expedient developments.

Die erfindungsgemäße Ausführung eignet sich zur Anwendung in Werkzeugmaschinen, insbesondere in Handwerkzeugmaschinen mit elektrischem Antriebsmotor, vorzugsweise Elektrohandwerkzeugen, die zum Schleifen oder zu einer sonstigen spanenden Bearbeitung eingesetzt werden. Als elektrischer Antriebsmotor wird bevorzugt ein Wechselstrommotor, insbesondere ein Reihenschlussmotor eingesetzt. Gegebenenfalls kann auch ein Gleichstrommotor wie ein permanenterregter Motor verwendet werden. Der elektrische Antriebsmotor weist Polschuhe zur verbesserten Leitung des Magnetfeldes auf, außerdem ist dem Antriebsmotor ein Lüfterrad zugeordnet, welches von der Ankerwelle des Antriebsmotors angetrieben wird und über das ein Kühlluftstrom zur Kühlung des Motors sowie sonstiger Bauteile der Werkzeugmaschine erzeugt wird. Der Kühlluftstrom wird in das Gehäuse der Werkzeugmaschine eingeführt, am Antriebsmotor vorbeigeleitet und über Abströmöffnungen wieder aus dem Gehäuse abgeleitet.The embodiment of the invention is suitable for use in machine tools, in particular in hand tool machines with electric drive motor, preferably electric hand tools, which are used for grinding or other machining. The electric drive motor used is preferably an alternating-current motor, in particular a series-wound motor. Optionally, a DC motor such as a permanent-magnet motor may be used. The electric drive motor has pole pieces for improved conduction of the magnetic field, also the drive motor is associated with a fan, which is driven by the armature shaft of the drive motor and via which a cooling air flow for cooling the motor and other components of the machine tool is generated. The cooling air flow is introduced into the housing of the machine tool, guided past the drive motor and discharged via outlet openings again from the housing.

Erfindungsgemäß ist im Gehäuse ein Luftleitelement vorgesehen, das bevorzugt an einer Stirnseite des Elektromotors angeordnet ist und einen Abschnitt des Strömungswegs des Kühlluftstroms innerhalb des Gehäuses bildet. Das Luftleitelement verdeckt die Polschuhe zumindest teilweise, so dass der betreffende Abschnitt der Polschuhe außerhalb des Strömungswegs des Kühlluftstroms liegt.According to the invention, an air guide element is provided in the housing, which is preferably arranged on an end face of the electric motor and forms a portion of the flow path of the cooling air flow within the housing. The air guiding element covers the pole shoes at least partially, so that the relevant section of the pole shoes is outside the flow path of the cooling air flow.

Diese Ausführung hat den Vorteil, dass die Polschuhe vor den abrasiven Schmutzpartikeln, die im Kühlluftstrom mitgeführt werden, geschützt sind. Der abrasive Staub kann sich nicht an den Polschuhen, insbesondere an Wickelköpfen der Polschuhe ablagern. Die Polschuhe sind über das Luftleitelement mechanisch vor Verschmutzung geschützt.This design has the advantage that the pole pieces are protected from the abrasive particles of dirt carried in the cooling air flow. The abrasive dust can not adhere to the pole shoes, in particular to the winding heads of the pole shoes deposit. The pole pieces are mechanically protected against contamination via the air guide element.

Ein weiterer Vorteil liegt in dem optimierten Strömungsverlauf, insbesondere im Bereich der Polschuhe, da das Luftleitelement zusätzlich zum Schutz der Polschuhe auch einen Teil des Strömungsweges des Kühlluftstromes bildet, wobei über die Form des Luftleitelementes Einfluss auf die Strömung genommen werden kann. Außerdem werden Luftverwirbelungen im Bereich der Polschuhe vermieden, die auf der dem Strömungsweg abgewandten Seite des Luftleitelementes angeordnet sind. Da störende Einflüsse auf den Strömungsverlauf entfallen bzw. zumindest reduziert sind, die mit Druckunterschieden einhergehen, wird auch ein angenehmeres Geräuschbild erzielt, weil in der Strömung keine hohen Frequenzen und auch nur geringere Amplituden erzeugt werden.A further advantage lies in the optimized flow course, in particular in the region of the pole shoes, since the air guide element also forms part of the flow path of the cooling air flow, in addition to protecting the pole shoes, it being possible to influence the flow via the shape of the air guide element. In addition, air turbulence in the region of the pole shoes are avoided, which are arranged on the side facing away from the flow path of the air guide element. Since disturbing influences on the flow path omitted or at least reduced, which are associated with pressure differences, a more pleasant sound image is achieved because in the flow no high frequencies and even lower amplitudes are generated.

Des Weiteren wird auch eine Geräuschabschirmung des Rotors des elektrischen Antriebsmotors erzielt, so dass geringere Motorgeräusche nach außen dringen. Schließlich entsteht im elektrischen Antriebsmotor eine geringere Verlustleistung, da weniger Verwirbelungen entstehen, die dem Antriebsmotor durch Druckschwankungen mechanische Energie entziehen.Furthermore, a noise shield of the rotor of the electric drive motor is achieved, so that lower engine noise penetrate to the outside. Finally, a lower power loss occurs in the electric drive motor, since less turbulence occurs, which withdraw mechanical energy from the drive motor due to pressure fluctuations.

Gemäß einer bevorzugten Weiterbildung weist das Luftleitelement einen die Stirnseite der Polschuhe aufnehmenden und außerhalb des Strömungswegs des Kühlluftstroms liegenden Polschuhaufnahmeabschnitt auf. Das Luftleitelement ist vorzugsweise als Luftleitring ausgebildet, wobei der Polschuhaufnahmeabschnitt zweckmäßigerweise einen Ringraum bildet, der radial außerhalb eines zylindrischen Luftleitstutzens liegt, der Bestandteil des Luftleitringes ist. Der Luftleitstutzen begrenzt auf einer Seite den Strömungsweg des Kühlluftstroms und auf der gegenüberliegenden Seite seiner Wandung die Polschuhe, die vom Stutzen überdeckt werden. Vorteilhafterweise liegen die Polschuhe radial außerhalb des Strömungswegs, so dass der als Ringraum ausgebildete Polschuhaufnahmeabschnitt im Luftleitring ebenfalls außerhalb des Strömungsweges liegt. Dementsprechend wird der Kühlluftstrom zwischen dem Anker des bevorzugt als Innenläufermotor ausgebildeten Elektromotors und dem Stator axial durch den Motor geführt. Bei dieser Luftführung werden sowohl die Statorteile als auch die Anker- bzw. Rotorteile des Elektromotors gekühlt.According to a preferred refinement, the air guide element has a pole shoe receiving section receiving the front side of the pole shoes and lying outside the flow path of the cooling air flow. The air guide element is preferably designed as an air guide ring, wherein the Polschuhaufnahmeabschnitt expediently forms an annular space which lies radially outside of a cylindrical Luftleitstutzens, which is part of the air guide ring. The air duct defines on one side the flow path of the cooling air flow and on the opposite side of its wall, the pole pieces, which are covered by the nozzle. Advantageously, the pole shoes are located radially outside the flow path, so that the annular space formed as Polschuhaufnahmeabschnitt in the air guide is also outside the flow path. Accordingly, the cooling air flow between the armature of the preferably designed as an internal rotor motor electric motor and the stator is guided axially through the motor. In this air duct both the stator and the armature or rotor parts of the electric motor are cooled.

An dem Luftleitelement ist mindestens eine in den Strömungsweg einragende Strömungsschaufel ausgebildet, die insbesondere radial zum Strömungsweg gerichtet ist, um eine verbesserte bzw. in einer bestimmten Weise gewünschte Strömungsführung zu erreichen. Die Strömungsschaufel kann hierbei einen festen, nicht veränderlichen Bestandteil des Luftleitringes bilden, oder, gemäß alternativer Ausführung, beweglich am Luftleitelement gehalten sein, beispielsweise über ein Filmscharnier oder dergleichen.At least one flow blade which projects into the flow path and which is directed in particular radially to the flow path in order to achieve an improved or, in a certain way, desired flow guidance, is formed on the air guide element. The flow blade can in this case form a solid, non-variable component of the air guide ring, or, according to an alternative embodiment, be movably held on the air guide element, for example via a film hinge or the like.

Der Strömungsstutzen im Luftleitring dient insbesondere zur Aufnahme des Lüfterrades, welches koaxial zur Anker- bzw. Rotorwelle des Elektromotors angeordnet und drehfest mit dem Rotor verbunden ist. Der Strömungsstutzen kommuniziert hierbei mit dem Aufnahmeraum im Luftleitelement, in welchem das Lüfterrad drehbar gelagert ist. Luftleitelement und Lüfterrad bilden damit eine bauliche Einheit, wodurch ein so genannter Impeller entsteht, also ein gekapselter Propeller.The flow nozzle in the air guide is used in particular for receiving the fan wheel, which is arranged coaxially to the armature or rotor shaft of the electric motor and rotatably connected to the rotor. The flow nozzle communicates with the receiving space in the air guide, in which the fan is rotatably mounted. Air guide and fan wheel thus form a structural unit, creating a so-called impeller, ie an encapsulated propeller.

Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:

Fig. 1
eine schematische Darstellung einer elektrischen Handwerkzeugmaschine,
Fig. 2
eine perspektivische Darstellung eines Elektromotors in der Handwerkzeugmaschine, mit einem an einer axialen Stirnseite des Motors angeordneten Luftleitring,
Fig. 3
der Elektromotor einschließlich Luftleitring in einer weiteren perspektivischen Darstellung,
Fig. 4
einen Schnitt durch den Elektromotor einschließlich Luftleitring,
Fig. 5
der Luftleitring in einzelner, perspektivischer Darstellung,
Fig. 6
der Luftleitring in einer weiteren Ausführung mit zusätzlichen, radial zum Strömungsweg gerichteten Strömungsschaufeln.
Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
Fig. 1
a schematic representation of an electric hand tool,
Fig. 2
a perspective view of an electric motor in the power tool, with a on a axial end face of the engine arranged air guide ring,
Fig. 3
the electric motor including air guide ring in a further perspective view,
Fig. 4
a section through the electric motor including air guide ring,
Fig. 5
the air guide ring in a single, perspective view,
Fig. 6
the air guide ring in a further embodiment with additional, radially directed to the flow path flow blades.

In den Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the figures, the same components are provided with the same reference numerals.

Die in Fig. 1 in allgemeiner Weise dargestellte Handwerkzeugmaschine 1 weist in einem Gehäuse 2 einen elektrischen Antriebsmotor 3 auf, der insbesondere als Wechselstrommotor, vorzugsweise als Reihenschlussmotor ausgebildet ist, wobei gegebenenfalls auch ein Gleichstrommotor in Frage kommt. Die Rotor- bzw. Ankerwelle 4 des Antriebsmotors 3 ist mit einer im Gehäuse drehbar gelagerten Werkzeugwelle 5 drehgekoppelt und treibt diese an, an der Werkzeugwelle 5 befindet sich ein Werkzeug 6 zur Bearbeitung eines Werkstückes.In the Fig. 1 hand tool machine 1 shown in a general way, in a housing 2 to an electric drive motor 3, which is designed in particular as an AC motor, preferably as a series motor, optionally also a DC motor is suitable. The rotor or armature shaft 4 of the drive motor 3 is rotationally coupled to a rotatably mounted in the housing tool shaft 5 and drives them, on the tool shaft 5 is a tool 6 for machining a workpiece.

Wie den Figuren 2 und 3 zu entnehmen, weist der elektrische Antriebsmotor 3 Polschuhe 7 auf, die insbesondere als Wickelköpfe ausgeführt sind und einen Bestandteil des Stators des Antriebsmotors bilden. Desweiteren ist ein die Polschuhe 7 ringförmig umschließendes Rückschlussteil 8 vorhanden, das ggf. auch Permanentmagnete aufweisen kann.Like that FIGS. 2 and 3 can be seen, the electric drive motor 3 pole pieces 7, which are designed in particular as a winding heads and form part of the stator of the drive motor. Furthermore, a pole piece 7 annular enclosing return part 8 is present, which may possibly also have permanent magnets.

An einer Stirnseite des elektrischen Antriebsmotors 3 befindet sich koaxial zur Rotor- bzw. Ankerwelle 11 des Antriebsmotors ein Luftleitring 9, in welchem ein nur symbolisch eingetragenes Lüfterrad drehbar umläuft, das drehfest mit der Welle 11 gekoppelt ist. Der Luftleitring 9 umgreift das Lüfterrad 10, beide Bauteile bilden zusammen einem Impeller.Coaxially with the rotor shaft or armature shaft 11 of the drive motor, an air guide ring 9, in which an only symbolically registered fan wheel rotates rotatably, which is non-rotatably coupled to the shaft 11, is located on one end side of the electric drive motor 3. The air guide ring 9 surrounds the fan 10, both components together form an impeller.

Wie Fig. 3 zu entnehmen, weist der Luftleitring 9 einen radial verjüngten und sich in Achsrichtung erstreckenden Luftleitstutzen 12 auf, der einstückig mit dem Luftleitring ausgebildet ist, welcher bevorzugt aus einem Kunststoff gefertigt ist. Der Luftleitstutzen 12 dient zur Strömungsführung von Kühlluft, welche durch das Gehäuse der Handwerkzeugmaschine geführt ist und insbesondere im Radialbereich zwischen Anker und Stator des Elektromotors axial hindurchgeleitet wird. Der Luftleitstutzen 12 bildet einen Teil des Strömungswegs für den Kühlluftstrom. Die Außenseite des Luftleitstutzens 12 begrenzt dagegen die axiale Stirnseite der Polschuhe 7.As Fig. 3 can be seen, the air guide ring 9 a radially tapered and extending in the axial direction Luftleitstutzen 12, which is integrally formed with the air guide ring, which is preferably made of a plastic. The air duct 12 serves to guide the flow of cooling air, which is guided through the housing of the power tool and is passed axially in particular in the radial region between armature and stator of the electric motor. The air duct 12 forms part of the flow path for the cooling air flow. The outside of the Luftleitstutzens 12, however, limits the axial end face of the pole pieces. 7

Wie der Schnittdarstellung nach Fig. 4 zu entnehmen, ist radial außerhalb des zylindrischen Luftleitstutzens 12 ein Ringraum 13 im Luftleitring 9 zur Aufnahme der Stirnseite der Polschuhe 7 gebildet. Der Ringraum 13 bildet einen Polschuhaufnahmeabschnitt und ist radial innen von der Wandung des Luftleitstutzens 12 und radial außen von einer weiteren Wandung 14 begrenzt, die einteilig bzw. einstückig mit dem Luftleitring 9 ausgebildet ist.As the sectional view Fig. 4 can be seen, an annular space 13 in the air guide ring 9 for receiving the end face of the pole pieces 7 is formed radially outside of the cylindrical Luftleitstutzens 12. The annular space 13 forms a Polschuhaufnahmeabschnitt and is bounded radially inwardly by the wall of the Luftleitstutzens 12 and radially outwardly by a further wall 14 which is integrally formed or integrally with the air guide ring 9.

Radial zwischen dem Anker 16 und den radial umgreifenden Statorteilen wie z.B. dem Rückschlussteil 8 ist ein axial verlaufender Strömungsweg 15 durch den Antriebsmotor 3 gebildet für die Kühlluft, welche durch die Umdrehung des Lüfterrades in das Gehäuse eingesaugt wird. Der Strömungsweg 15 mündet in den Luftleitstutzen 12 des Luftleitringes 9. Auf diese Weise durchströmt der Kühlluftstrom den Antriebsmotor 3 über dessen axiale Länge und wird axial über die offene Stirnseite, welche dem Luftleitstutzen 12 gegenüberliegt, aus dem Luftleitring 9 abgeleitet.Radially between the armature 16 and the radially encompassing stator parts such as the return part 8 is an axially extending flow path 15 formed by the drive motor 3 for the cooling air, which is sucked by the rotation of the fan wheel in the housing. The flow path 15 opens into the air duct 12 of the air guide ring 9. In this way, the cooling air flow flows through the drive motor 3 over its axial length and is axially beyond the open end face, which the air duct 12 is opposite, derived from the air guide ring 9.

In Fig. 5 ist der Luftleitring 9 nochmals in perspektivischer Einzeldarstellung gezeigt. Zu erkennen ist der Luftleitstutzen 12, welcher bezogen auf den Außendurchmesser des Luftleitringes 9 etwa den halben Durchmesser aufweist. In Achsrichtung nimmt der Luftleitstutzen 12 maximal die halbe Länge der gesamten axialen Erstreckung des Luftleitringes 9 ein.In Fig. 5 is the air guide 9 again shown in perspective detail. Evident is the air duct 12, which has based on the outer diameter of the air guide ring 9 about half the diameter. In the axial direction of Luftleitstutzen 12 takes a maximum of half the length of the entire axial extent of the air guide ring 9 a.

In Fig. 6 ist ein Luftleitring 9 in einer modifizierten Ausführung dargestellt. Einteilig mit dem Strömungsstutzen 12 sind zwei diametral gegenüberliegende, radial sich nach außen öffnende Strömungsschaufeln 17 ausgebildet, die einen Bestandteil der Wandung des Luftleitstutzens 12 bilden, jedoch gegenüber der Zylinderwandung mit radialer Komponente aufgeweitet sind und sich nach außen erstrecken. Die Strömungsschaufeln 17 öffnen sich in Richtung des Ringraumes 13, der zur Aufnahme der Polschuhe dient. Damit wird ein Strömungsweg frei gegeben zwischen dem Inneren des Luftleitstutzens 12 als Bestandteil des Strömungsweges und dem Ringraum 13, so dass ein Teilstrom des Kühlluftstromes über die geöffneten Strömungsschaufeln 17 radial in den Ringraum 13 eintreten kann und für eine zusätzliche Kühlung der Polschuhe sorgt.In Fig. 6 an air guide ring 9 is shown in a modified embodiment. Integrally formed with the flow nozzle 12 are two diametrically opposed, radially outwardly opening flow blades 17 which form part of the wall of the Luftleitstutzens 12, but are widened with respect to the cylinder wall with a radial component and extend outwardly. The flow blades 17 open in the direction of the annular space 13, which serves to receive the pole pieces. Thus, a flow path is released between the interior of the Luftleitstutzens 12 as part of the flow path and the annular space 13, so that a partial flow of the cooling air flow through the open flow blades 17 can enter radially into the annular space 13 and provides additional cooling of the pole pieces.

Die Strömungsschaufeln 17 sind ggf. beweglich ausgebildet und zwischen der dargestellten geöffneten Position und einer geschlossenen Position zu verstellen, in denen die Strömungsschaufeln 17 in der Wandung des Luftleitstutzens 12 liegen, so dass kein radialen Übertritt von Kühlluft möglich ist. Die Schwenkbeweglichkeit der Strömungsschaufeln 17 kann beispielsweise über ein Filmscharnier gebildet sein, über das die Strömungsleitschaufeln mit der Wandung des Luftleitstutzens 12 verbunden sind. Grundsätzlich ist aber auch eine feste, unbewegliche Ausbildung der Strömungsschaufeln 17 möglich.The flow blades 17 are optionally designed to be movable and to be adjusted between the illustrated open position and a closed position in which the flow blades 17 are in the wall of the Luftleitstutzens 12, so that no radial transfer of cooling air is possible. The pivoting mobility of the flow blades 17 may be formed for example via a film hinge, via which the flow guide vanes are connected to the wall of the Luftleitstutzens 12. In principle, however, a firm, immobile training of the flow blades 17 is possible.

Claims (10)

  1. Machine tool, in particular handheld machine tool, for example an angle grinder, having an electric drive motor (3) which has pole shoes (7) for conducting a magnetic field, and having a fan impeller (10) for generating a cooling air stream which can be conducted through a housing (2) of the machine tool (1), wherein an air guide element (9) in the housing (2) forms a section of the flow path (15) of the cooling air stream, wherein the air guide element (9) at least partially covers the pole shoes (7) in such a way that the pole shoes (7) are situated at least partially outside the flow path (15) of the cooling air stream, characterized in that at least one flow vane (17) which projects into the flow path is formed on the air guide element (9).
  2. Machine tool according to Claim 1, characterized in that the air guide element has a pole shoe accommodation section (13) which accommodates the end face of the pole shoes (7) and is situated outside the flow path (15) of the cooling air stream.
  3. Machine tool according to Claim 1 or 2, characterized in that the air guide element is in the form of an air guide ring (9).
  4. Machine tool according to Claim 3, characterized in that the air guide ring (9) has a cylindrical air guide nozzle (12), wherein the pole shoes (7) are situated radially outside the air guide nozzle (12).
  5. Machine tool according to Claim 4, characterized in that the fan impeller (10) is accommodated in the air guide nozzle (12) in the air guide ring (9).
  6. Machine tool according to Claims 2 and 4, characterized in that the pole shoe accommodation section is in the form of an annular space (13) radially outside the cylindrical air guide nozzle (12).
  7. Machine tool according to Claim 6, characterized in that the flow vane (17) projects into the annular space (13) which serves as a pole shoe accommodation section.
  8. Machine tool according to one of Claims 1 to 7, characterized in that the position of the flow vane (17) can be variably adjusted.
  9. Machine tool according to one of Claims 1 to 8, characterized in that the flow vane (17) is directed radially towards the flow path (15).
  10. Machine tool according to one of Claims 1 to 9, characterized in that the flow path (15) of the cooling air stream runs radially on the inside of the pole shoes (7).
EP09733179A 2008-04-18 2009-03-13 Machine tool having an electric drive motor Active EP2279058B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001258A DE102008001258A1 (en) 2008-04-18 2008-04-18 Machine tool with electric drive motor
PCT/EP2009/052954 WO2009127482A1 (en) 2008-04-18 2009-03-13 Machine tool having an electric drive motor

Publications (2)

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EP2279058A1 EP2279058A1 (en) 2011-02-02
EP2279058B1 true EP2279058B1 (en) 2011-11-23

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US (1) US8584771B2 (en)
EP (1) EP2279058B1 (en)
CN (1) CN102006971B (en)
AT (1) ATE534488T1 (en)
DE (1) DE102008001258A1 (en)
RU (1) RU2508977C2 (en)
WO (1) WO2009127482A1 (en)

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US20110036610A1 (en) 2011-02-17
RU2010146705A (en) 2012-05-27
RU2508977C2 (en) 2014-03-10
CN102006971B (en) 2013-07-17
US8584771B2 (en) 2013-11-19
EP2279058A1 (en) 2011-02-02
DE102008001258A1 (en) 2009-10-22
CN102006971A (en) 2011-04-06
ATE534488T1 (en) 2011-12-15
WO2009127482A1 (en) 2009-10-22

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