EP2146820B2 - Machine tool, particularly hand machine tool - Google Patents

Machine tool, particularly hand machine tool Download PDF

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Publication number
EP2146820B2
EP2146820B2 EP08708891.0A EP08708891A EP2146820B2 EP 2146820 B2 EP2146820 B2 EP 2146820B2 EP 08708891 A EP08708891 A EP 08708891A EP 2146820 B2 EP2146820 B2 EP 2146820B2
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EP
European Patent Office
Prior art keywords
housing
air guide
power tool
functional section
lateral surface
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EP08708891.0A
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German (de)
French (fr)
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EP2146820A1 (en
EP2146820B1 (en
Inventor
Florian Esenwein
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Robert Bosch GmbH
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Robert Bosch GmbH
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Classifications

    • 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
    • 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
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the invention relates to a machine tool, in particular a hand tool such. an angle grinder, with a tool driving a drive motor according to the preamble of claim 1.
  • the DE 102 48 921 A1 shows an electric hand tool having a motor housing with an electric drive motor and a transmission housing with gear components and a tool shaft for receiving a tool. Between the motor housing and the transmission housing is an air guide ring, which forms part of the housing. The air guide carries a switching element.
  • the DE 295 01 974 U1 discloses an air guide ring in a two-part housing of the power tool. The air guide ring has flow outlet openings, which are directed in the longitudinal direction, relative to the engine longitudinal axis.
  • the DE 29 10 845 A1 shows a hand drill, which has an air guide in the grip area.
  • Such hand tool machines may be provided with an air guide in the housing, which derives a drive motor sweeping and cooling air flow from the housing.
  • the invention is based on the object with simple constructive measures a machine tool, in particular a hand tool, which has an air guide in the housing to improve to the effect that beyond the air guide function additional functions can be taken over by the air guide.
  • the machine tool according to the invention which is in particular a hand tool, for example an angle grinder, has a tool driving a drive motor and an air guide, which is arranged in the housing of the machine tool and derives a drive motor sweeping air flow to the outside. Furthermore, it is provided that the air guide element has a functional portion which forms part of the outer circumferential surface of the machine tool.
  • the air guide element is consequently not completely integrated into the housing interior, but rather the functional section of the air guide element projects through the housing, so that in this area the jacket surface of the machine tool is formed by the projecting outside of the functional section. This makes it possible to provide the function section various additional functions, which can be realized with only a small design effort.
  • the functional portion is advantageously formed integrally with the air guide, which is preferably designed as a plastic part, in particular as an injection molded part.
  • the air guide element is constructed in two parts and comprises an air guide ring and an air guide disc.
  • the functional portion forms part of the outer lateral surface of the power tool and is designed as anti-rotation between the housing parts, with the help of the anti-rotation element a positive connection between the housing parts can be generated, which is effective in particular in the circumferential direction, but also in the axial direction.
  • the housing parts are thus securely locked against each other, wherein the positive connection can be made either between only one housing part and the functional portion or between the two housing parts and the functional portion.
  • mounting the functional section can also serve as a joining aid.
  • the functional section may just project through a recess in the housing so far that a continuous lateral surface without elevation or depression is formed.
  • the components of the air guide element are in contact and the functional section is arranged on the air guide disk.
  • Hand tool 1 shown is an angle grinder according to the prior art, which has an electric drive motor 2 in a motor housing 3, which is connected to a transmission housing 4.
  • a gear not shown, is received, which is driven by the rotor of the electric drive motor and transmits the rotational movement of the rotor to a rotating tool.
  • an air flow 5 is generated in the interior of the motor housing 3, which is guided along the drive motor and derived via an air guide element 6 from the housing.
  • the air guide element 6 is constructed in two parts and comprises an air guide disk 7 and an air guide ring 8.
  • Air guide disk 7 and air guide ring 8 are arranged in the transition region between the motor housing 3 and the transmission housing 4, the air guide disk 7 being connected to the transmission housing 4 and the air guide ring 8 being connected to the motor housing 3 , In the mounted position, the air guide ring 8 and the air guide disc 7 interact, both components are in contact with each other, wherein a flow path for the discharge of the air flow 5 is formed between the components.
  • FIGS. 2 and 3 As the perspective views of a spoiler 7 in the FIGS. 2 and 3 can be seen distributed over the circumference several individual functional portions 9 integrally formed with the air guide 7. Since the functional sections 9 extend into recesses in the housing, the functional sections 9 have a greater radial distance from the central axis than the remaining areas of the air-guiding disk.
  • Fig. 4 The side view after Fig. 4 It can be seen that the functional portion 9 is positioned adjacent to the parting line 11 between the motor housing 3 and the gear housing 4.
  • a recess 12 is introduced, wherein the shape of the recess 12 and the shape of the functional portion 9 are adapted to each other, so that the functional portion completely fills the recess 12.
  • the recess 12 is located at a small distance from the parting line 11 between the motor housing 3 and the gear housing 4 Figure 4 hinted with reference numeral 13, the rotating tool located on the bottom of the gear housing.
  • the function section 9 takes on the task of a Vermosschommes institutes to prevent mutual rotation of the motor housing 3 and the gear housing 4.
  • a recess in the housing wall of both housing parts is introduced in the region of the parting line 11 between the motor housing 3 and the gear housing 4, which recess is jointly occupied by the functional section 9.
  • the functional section 9 thus extends partly into the area of the motor housing 3 and partly into the area of the gear housing 4.
  • FIGS. 7 to 9 A further example of an anti-twist device according to the invention can be found in FIGS. 7 to 9.
  • the functional section 9 is introduced into a recess in the motor housing 3 and has on its outside a toothing which interacts with a lever 15 which is pivotable on the upper side of the gear housing 4 is arranged.
  • This lever 15 is to be adjusted between the engagement position shown in Fig. 8 and the engagement position shown in Fig. 9, in which the lever 15 engages latching in the toothing on the outside of the functional portion 9.
  • This can also be a Relative rotation of the two housing parts 3 and 4 are prevented from each other.
  • an additional axial locking can be realized, so that as seen in the axial direction, a release of the housing parts 3 and 4 is prevented from each other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Sawing (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The invention relates to a machine tool, particularly a hand machine tool, which comprises a driving motor and an air guide element, which is disposed in the housing of the machine tool and conducts an air current passing over the driving motor to the outside. The air guide element comprises a functional section, which forms a part of the outer lateral surface of the machine tool.

Description

Die Erfindung betrifft eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine wie z.B. ein Winkelschleifer, mit einem ein Werkzeug antreibenden Antriebsmotor nach dem Oberbegriff des Anspruches 1.The invention relates to a machine tool, in particular a hand tool such. an angle grinder, with a tool driving a drive motor according to the preamble of claim 1.

Stand der TechnikState of the art

Die DE 102 48 921 A1 zeigt ein Elektrohandwerkzeug, das ein Motorgehäuse mit einem elektrischen Antriebsmotor und ein Getriebegehäuse mit Getriebebauteilen sowie einer Werkzeugwelle zur Aufnahme eines Werkzeugs aufweist. Zwischen Motorgehäuse und Getriebegehäuse befindet sich ein Luftleitring, der einen Teil des Gehäuses bildet. Der Luftleitring trägt ein Schaltelement. Die DE 295 01 974 U1 offenbart einen Luftleitring in einem zweiteiligen Gehäuse der Handwerkzeugmaschine. Der Luftleitring weist Strömungsauslassöffnungen auf, die in Längsrichtung, bezogen auf die Motorlängsachse, gerichtet sind.The DE 102 48 921 A1 shows an electric hand tool having a motor housing with an electric drive motor and a transmission housing with gear components and a tool shaft for receiving a tool. Between the motor housing and the transmission housing is an air guide ring, which forms part of the housing. The air guide carries a switching element. The DE 295 01 974 U1 discloses an air guide ring in a two-part housing of the power tool. The air guide ring has flow outlet openings, which are directed in the longitudinal direction, relative to the engine longitudinal axis.

Die DE 29 10 845 A1 zeigt eine Handbohrmaschine, welche im Griffbereich einen Luftleitring aufweist.The DE 29 10 845 A1 shows a hand drill, which has an air guide in the grip area.

Zur Verbesserung der Kühlung können derartige Handwerkzeugmaschinen mit einem Luftleitelement im Gehäuse versehen sein, welches einen den Antriebsmotor überstreichenden und kühlenden Luftstrom aus dem Gehäuse ableitet.To improve the cooling such hand tool machines may be provided with an air guide in the housing, which derives a drive motor sweeping and cooling air flow from the housing.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zugrunde, mit einfachen konstruktiven Maßnahmen eine Werkzeugmaschine, insbesondere eine Handwerkzeugmaschine, die im Gehäuse ein Luftleitelement aufweist, dahingehend zu verbessern, dass über die Luftleitfunktion hinausgehend zusätzliche Funktionen von dem Luftleitelement übernommen werden können.The invention is based on the object with simple constructive measures a machine tool, in particular a hand tool, which has an air guide in the housing to improve to the effect that beyond the air guide function additional functions can be taken over by the air guide.

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 Werkzeugmaschine, bei der es sich insbesondere um eine Handwerkzeugmaschine, beispielsweise einen Winkelschleifer handelt, weist einen ein Werkzeug antreibenden Antriebsmotor und ein Luftleitelement auf, das im Gehäuse der Werkzeugmaschine angeordnet ist und einen den Antriebsmotor überstreichenden Luftstrom nach außen ableitet. Des Weiteren ist vorgesehen, dass das Luftleitelement einen Funktionsabschnitt aufweist, der einen Teil der äußeren Mantelfläche der Werkzeugmaschine bildet. Das Luftleitelement ist demzufolge nicht vollständig in das Gehäuseinnere integriert, vielmehr durchragt der Funktionsabschnitt des Luftleitelements das Gehäuse, so dass in diesem Bereich die Mantelfläche der Werkzeugmaschine von der herausragenden Außenseite des Funktionsabschnittes gebildet wird. Dadurch ist es möglich, dem Funktionsabschnitt verschiedene zusätzliche Funktionen zukommen zu lassen, was mit einem lediglich geringen konstruktiven Aufwand verwirklicht werden kann. Der Funktionsabschnitt ist vorteilhafterweise einteilig mit dem Luftleitelement ausgebildet, das bevorzugt als Kunststoffteil ausgeführt ist, insbesondere als Spritzgussteil. Grundsätzlich kommen aber auch Ausführungen aus anderem Material für das Luftleitelement infrage, beispielsweise Metallausführungen. Das Luftleitelement ist zweiteilig aufgebaut und umfasst einen Luftleitring und eine Luftleitscheibe.The machine tool according to the invention, which is in particular a hand tool, for example an angle grinder, has a tool driving a drive motor and an air guide, which is arranged in the housing of the machine tool and derives a drive motor sweeping air flow to the outside. Furthermore, it is provided that the air guide element has a functional portion which forms part of the outer circumferential surface of the machine tool. The air guide element is consequently not completely integrated into the housing interior, but rather the functional section of the air guide element projects through the housing, so that in this area the jacket surface of the machine tool is formed by the projecting outside of the functional section. This makes it possible to provide the function section various additional functions, which can be realized with only a small design effort. The functional portion is advantageously formed integrally with the air guide, which is preferably designed as a plastic part, in particular as an injection molded part. In principle, however, versions of other material for the air guide in question, for example, metal versions. The air guide element is constructed in two parts and comprises an air guide ring and an air guide disc.

Der Funktionsabschnitt bildet einen Teil der äußeren Mantelfläche der Handwerkzeugmaschine und ist als Verdrehsicherungselement zwischen den Gehäuseteilen ausgebildet, wobei mithilfe des Verdrehsicherungselementes ein Formschluss zwischen den Gehäuseteilen erzeugt werden kann, der insbesondere in Umfangsrichtung, aber auch in Achsrichtung wirksam ist. Die Gehäuseteile sind somit sicher gegeneinander verriegelt, wobei der Formschluss entweder zwischen nur einem Gehäuseteil und dem Funktionsabschnitt oder zwischen beiden Gehäuseteilen und dem Funktionsabschnitt hergestellt werden kann. Beim Montieren kann der Funktionsabschnitt zusätzlich als Fügehilfe dienen.The functional portion forms part of the outer lateral surface of the power tool and is designed as anti-rotation between the housing parts, with the help of the anti-rotation element a positive connection between the housing parts can be generated, which is effective in particular in the circumferential direction, but also in the axial direction. The housing parts are thus securely locked against each other, wherein the positive connection can be made either between only one housing part and the functional portion or between the two housing parts and the functional portion. When mounting the functional section can also serve as a joining aid.

Der Funktionsabschnitt kann gemäß einer vorteilhaften Ausführung gerade so weit durch eine Ausnehmung in dem Gehäuse hindurchragen, dass eine durchgehende Mantelfläche ohne Erhebung oder Vertiefung gebildet ist.According to an advantageous embodiment, the functional section may just project through a recess in the housing so far that a continuous lateral surface without elevation or depression is formed.

Möglich ist außerdem eine über den Umfang des Gehäuses verteilte Anordnung mehrerer Funktionsabschnitte, die jeweils durch Ausnehmungen im Gehäuse hindurchragen. Hierdurch ist sichergestellt, dass die jeweilige Funktion, welche vom Funktionsabschnitt übernommen wird, über den Umfang des Gerätes wirksam ist.Also possible is a distributed over the circumference of the housing arrangement of a plurality of functional sections, which protrude through respective recesses in the housing. This ensures that the respective function, which is taken over by the functional section, is effective over the scope of the device.

Gemäß einer weiteren vorteilhaften Ausführung liegen die Bestandteile des Luftleitelements auf Kontakt und der Funktionsabschnitt ist an der Luftleitscheibe angeordnet.According to a further advantageous embodiment, the components of the air guide element are in contact and the functional section is arranged on the air guide disk.

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

  • Fig. 1 einen Schnitt durch einen Winkelschleifer nach dem Stand der Technik mit einem Motorgehäuse und einem Getriebegehäuse und einem im Übergangsbereich der Gehäuseteile angeordneten, zweiteiligen Luftleitelement, bestehend aus einem Luftleitring und einer Luftleitscheibe, wobei an der Luftleitscheibe Funktionsabschnitte angeordnet sind, die durch Ausnehmungen in der Wandung des Getriebegehäuses hindurchragen und dadurch einen Teil der äußeren Mantelfläche des Gehäuses bilden,
  • Fig. 2 eine Luftleitscheibe in perspektivischer Einzeldarstellung nach dem Stand der Technik mit insgesamt vier über den Umfang verteilten Funktionsabschnitten,
  • Fig. 3 eine Luftleitscheibe perspektivischer Einzeldarstellung nach dem Stand der Technik, mit lediglich zwei Funktionsabschnitten auf gegenüberliegenden Seiten des Umfangs,
  • Fig. 4 eine Seitenansicht eines Winkelschleifers nach dem Stand der Technik mit einem Funktionsabschnitt eines Luftleitelementes, das durch eine Ausnehmung im Getriebegehäuse hindurchragt,
  • Fig. 5 und 6 ein erstes Ausführungsbeispiel der Erfindung, bei dem der Funktionsabschnitt des Luftleitelementes die Aufgabe einer Verdrehsicherung übernimmt,
  • Fig. 7 bis 9 ein weiteres Ausführungsbeispiel der Erfindung, bei dem das Funktionselement ebenfalls als Verdrehsicherung wirkt, jedoch mit einem verstellbaren Hebel zusammenwirkt.
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 section through an angle grinder according to the prior art with a motor housing and a gear housing and arranged in the transition region of the housing parts, two-part air guide, consisting of an air guide ring and a Luftleitscheibe, wherein functional sections are arranged on the air deflector, which by recesses in the wall of the Projecting gear housing and thereby form part of the outer surface of the housing,
  • Fig. 2 an air guide disc in a perspective single representation according to the prior art with a total of four distributed over the circumference functional sections,
  • Fig. 3 an air guide disc perspective single representation according to the prior art, with only two functional sections on opposite sides of the circumference,
  • Fig. 4 3 is a side view of an angle grinder according to the prior art with a functional portion of an air guide element, which protrudes through a recess in the transmission housing,
  • 5 and 6 a first embodiment of the invention, in which the functional portion of the air guide element takes over the task of a rotation,
  • Fig. 7 to 9 a further embodiment of the invention, in which the functional element also acts as anti-rotation, but cooperates with an adjustable lever.

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

Bei der in Fig. 1 dargestellten Handwerkzeugmaschine 1 handelt es sich um einen Winkelschleifer nach dem Stand der Technik, der einen elektrischen Antriebsmotor 2 in einem Motorgehäuse 3 aufweist, welches mit einem Getriebegehäuse 4 verbunden ist. Im Getriebegehäuse 4 ist ein nicht dargestelltes Getriebe aufgenommen, welches von dem Rotor des elektrischen Antriebsmotors angetrieben wird und die Drehbewegung des Rotors auf ein rotierendes Werkzeug überträgt. Zur Kühlung des Motors 2 wird ein Luftstrom 5 im Inneren des Motorgehäuses 3 erzeugt, der entlang des Antriebsmotors geführt und über ein Luftleitelement 6 aus dem Gehäuse abgeleitet wird. Das Luftleitelement 6 ist zweiteilig aufgebaut und umfasst eine Luftleitscheibe 7 und einen Luftleitring 8. Luftleitscheibe 7 und Luftleitring 8 sind im Übergangsbereich zwischen Motorgehäuse 3 und Getriebegehäuse 4 angeordnet, wobei die Luftleitscheibe 7 mit dem Getriebegehäuse 4 und der Luftleitring 8 mit dem Motorgehäuse 3 verbunden ist. In der montierten Position wirken Luftleitring 8 und Luftleitscheibe 7 zusammen, beide Bauteile liegen auf Kontakt zueinander, wobei zwischen den Bauteilen ein Strömungsweg für die Ableitung des Luftstromes 5 gebildet ist.At the in Fig. 1 Hand tool 1 shown is an angle grinder according to the prior art, which has an electric drive motor 2 in a motor housing 3, which is connected to a transmission housing 4. In the gear housing 4, a gear, not shown, is received, which is driven by the rotor of the electric drive motor and transmits the rotational movement of the rotor to a rotating tool. For cooling the motor 2, an air flow 5 is generated in the interior of the motor housing 3, which is guided along the drive motor and derived via an air guide element 6 from the housing. The air guide element 6 is constructed in two parts and comprises an air guide disk 7 and an air guide ring 8. Air guide disk 7 and air guide ring 8 are arranged in the transition region between the motor housing 3 and the transmission housing 4, the air guide disk 7 being connected to the transmission housing 4 and the air guide ring 8 being connected to the motor housing 3 , In the mounted position, the air guide ring 8 and the air guide disc 7 interact, both components are in contact with each other, wherein a flow path for the discharge of the air flow 5 is formed between the components.

An der Luftleitscheibe 7 im Getriebegehäuse 4 sind einteilig ausgebildete Funktionsabschnitte 9 vorgesehen, die in eine Ausnehmung in der Wandung des Getriebegehäuses 4 einragen. Diese Funktionsabschnitte 9 können über die Luftleitfunktion hinausgehend zusätzliche Aufgaben übernehmen, die im Folgenden anhand der weiteren Figuren dargestellt werden. Die nach außen gewandte Seite der Funktionsabschnitte 9 bilden einen Teil der äußeren Mantelfläche 10 der Werkzeugmaschine. Möglich ist sowohl ein bündiges bzw. flächiges Abschließen mit den umgebenden Mantelflächenbereichen als auch eine erhabene Ausbildung der Funktionsabschnitte 9 bzw. ein Zurückversetzen in der Ausnehmung im Gehäuse, so dass in diesem Bereich die Mantelfläche vertieft ist.On the spoiler 7 in the gear housing 4 integrally formed functional portions 9 are provided, which protrude into a recess in the wall of the transmission housing 4. These functional sections 9 can assume additional tasks beyond the air guiding function, which tasks are illustrated below with reference to the further figures. The outwardly facing side of the functional sections 9 form part of the outer circumferential surface 10 of the machine tool. It is possible both a flush or surface closure with the surrounding lateral surface areas as well as a raised design of the functional sections 9 or a set back in the recess in the housing, so that in this area the lateral surface is recessed.

Wie den perspektivischen Darstellungen einer Luftleitscheibe 7 in den Figuren 2 und 3 zu entnehmen, können über den Umfang verteilt mehrere einzelne Funktionsabschnitte 9 einteilig mit der Luftleitscheibe 7 ausgebildet sein. Da sich die Funktionsabschnitte 9 in Ausnehmungen im Gehäuse hinein erstrecken, weisen die Funktionsabschnitte 9 zur Mittelachse einen größeren radialen Abstand auf als die übrigen Bereiche der Luftleitscheibe.As the perspective views of a spoiler 7 in the FIGS. 2 and 3 can be seen distributed over the circumference several individual functional portions 9 integrally formed with the air guide 7. Since the functional sections 9 extend into recesses in the housing, the functional sections 9 have a greater radial distance from the central axis than the remaining areas of the air-guiding disk.

Der Seitenansicht nach Fig. 4 ist zu entnehmen, dass der Funktionsabschnitt 9 benachbart zu der Trennlinie 11 zwischen dem Motorgehäuse 3 und dem Getriebegehäuse 4 positioniert ist. In das Getriebegehäuse 4 ist eine Ausnehmung 12 eingebracht, wobei die Form der Ausnehmung 12 und die Form des Funktionsabschnittes 9 aufeinander angepasst sind, so dass der Funktionsabschnitt die Ausnehmung 12 vollständig ausfüllt. Die Ausnehmung 12 liegt mit geringem Abstand zur Trennlinie 11 zwischen Motorgehäuse 3 und Getriebegehäuse 4. Des Weiteren ist in Fig.4 andeutungsweise mit Bezugszeichen 13 das rotierende Werkzeug auf der Unterseite des Getriebegehäuses eingezeichnet.The side view after Fig. 4 It can be seen that the functional portion 9 is positioned adjacent to the parting line 11 between the motor housing 3 and the gear housing 4. In the gear housing 4, a recess 12 is introduced, wherein the shape of the recess 12 and the shape of the functional portion 9 are adapted to each other, so that the functional portion completely fills the recess 12. The recess 12 is located at a small distance from the parting line 11 between the motor housing 3 and the gear housing 4 Figure 4 hinted with reference numeral 13, the rotating tool located on the bottom of the gear housing.

In den Figuren 5 und 6 übernimmt der Funktionsabschnitt 9 erfindungsgemäss die Aufgabe eines Verdrehsicherungselementes, um ein gegenseitiges Verdrehen von Motorgehäuse 3 und Getriebegehäuse 4 zu verhindern. Hierzu ist im Bereich der Trennlinie 11 zwischen Motorgehäuse 3 und Getriebegehäuse 4 eine Ausnehmung in die Gehäusewandung beider Gehäuseteile eingebracht, die gemeinsam von dem Funktionsabschnitt 9 eingenommen wird. Der Funktionsabschnitt 9 erstreckt sich somit zum Teil in den Bereich des Motorgehäuses 3 und zum Teil in den Bereich des Getriebegehäuses 4 hinein. Dadurch ist eine Relatiwerdrehung zwischen den beiden Gehäuseteilen unmöglich gemacht.In the figures 5 and 6, the function section 9 according to the invention takes on the task of a Verdrehsicherungselementes to prevent mutual rotation of the motor housing 3 and the gear housing 4. For this purpose, a recess in the housing wall of both housing parts is introduced in the region of the parting line 11 between the motor housing 3 and the gear housing 4, which recess is jointly occupied by the functional section 9. The functional section 9 thus extends partly into the area of the motor housing 3 and partly into the area of the gear housing 4. As a result, a Relatiwerdrehung between the two housing parts is made impossible.

Ein weiteres Beispiel einer erfindungsgemässen Verdrehsicherung findet sich in den Figuren 7 bis 9. Der Funktionsabschnitt 9 ist in eine Ausnehmung im Motorgehäuse 3 eingebracht und weist auf seiner Außenseite eine Verzahnung auf, die mit einem Hebel 15 zusammenwirkt, der schwenkbar an der Oberseite des Getriebegehäuses 4 angeordnet ist. Dieser Hebel 15 ist zwischen der in Fig. 8 dargestellten Außereingriffsposition und der in Fig. 9 gezeigten Eingriffsposition zu verstellen, in welcher der Hebel 15 in die Verzahnung auf der Außenseite des Funktionsabschnittes 9 verrastend eingreift. Auf diese Weise kann ebenfalls eine Relativverdrehung der beiden Gehäuseteile 3 und 4 zueinander verhindert werden. Außerdem kann eine zusätzliche axiale Verrastung realisiert werden, so dass auch in Achsrichtung gesehen ein Lösen der Gehäuseteile 3 und 4 voneinander verhindert wird.A further example of an anti-twist device according to the invention can be found in FIGS. 7 to 9. The functional section 9 is introduced into a recess in the motor housing 3 and has on its outside a toothing which interacts with a lever 15 which is pivotable on the upper side of the gear housing 4 is arranged. This lever 15 is to be adjusted between the engagement position shown in Fig. 8 and the engagement position shown in Fig. 9, in which the lever 15 engages latching in the toothing on the outside of the functional portion 9. This can also be a Relative rotation of the two housing parts 3 and 4 are prevented from each other. In addition, an additional axial locking can be realized, so that as seen in the axial direction, a release of the housing parts 3 and 4 is prevented from each other.

Claims (7)

  1. Power tool, in particular a portable power tool such as an angle grinder (1), comprising a drive motor (2) driving a tool (13) and comprising an air guide element (6) which is arranged in the two-part housing of the power tool (1) and directs an air flow (5) passing over the drive motor (2) to the outside, wherein the air guide element (6) has a functional section (9) which forms part of the outer lateral surface (10) of the power tool,
    wherein the air guide element (6) is of two-piece construction and comprises an air guide ring (8) and an air guide disc (7), in that the functional section (9) of the air guide element (6) is arranged between the housing parts (3, 4) or adjacent to the parting line (11) between the housing parts (3, 4), and in that the air guide ring (8) is arranged in the first housing part (3) and the air guide disc (7) is arranged in the second housing part (4), characterized in that the functional section (9) forms part of the outer lateral surface of the portable power tool and is designed as an anti-rotation locking element between the housing parts (3, 4), wherein, with the aid of the anti-rotation locking element, a form fit can be created between the housing parts (3,4), which is effective in particular in the circumferential direction, but also in the axial direction and locks the housing parts (3, 4) securely together, wherein the form fit can be established either between only one housing part (3) and the functional section (9) or between both housing parts (3, 4) and the functional section (9).
  2. Power tool according to Claim 1, characterized in that the functional section (9) projects through a recess (12) in the housing.
  3. Power tool according to Claim 1 or 2, characterized in that the functional section (9) fits into the lateral surface (12) of the housing.
  4. Power tool according to one of Claims 1 to 3, characterized in that the functional section (9) projects beyond the lateral surface (12) of the housing.
  5. Power tool according to one of Claims 1 to 4, characterized in that the air guide ring (8) is in contact with the air guide disc (7).
  6. Power tool according to one of Claims 1 to 5, characterized in that a plurality of functional sections (9) projecting into the lateral surface (10) or forming the lateral surface (10) are provided in a distributed manner over the circumference.
  7. Power tool according to one of Claims 1 to 6, characterized in that the housing parts are formed by a motor housing (3) which accommodates the drive motor (2) and by a transmission housing (4) which accommodates a transmission.
EP08708891.0A 2007-04-12 2008-02-12 Machine tool, particularly hand machine tool Active EP2146820B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007017243A DE102007017243A1 (en) 2007-04-12 2007-04-12 Machine tool, in particular hand tool
PCT/EP2008/051649 WO2008125368A1 (en) 2007-04-12 2008-02-12 Machine tool, particularly hand machine tool

Publications (3)

Publication Number Publication Date
EP2146820A1 EP2146820A1 (en) 2010-01-27
EP2146820B1 EP2146820B1 (en) 2011-07-13
EP2146820B2 true EP2146820B2 (en) 2019-10-16

Family

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EP08708891.0A Active EP2146820B2 (en) 2007-04-12 2008-02-12 Machine tool, particularly hand machine tool

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US (1) US8113922B2 (en)
EP (1) EP2146820B2 (en)
CN (1) CN101657297B (en)
AT (1) ATE516112T1 (en)
DE (1) DE102007017243A1 (en)
RU (1) RU2472607C2 (en)
WO (1) WO2008125368A1 (en)

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Also Published As

Publication number Publication date
EP2146820A1 (en) 2010-01-27
RU2472607C2 (en) 2013-01-20
CN101657297B (en) 2013-03-06
US20090280732A1 (en) 2009-11-12
ATE516112T1 (en) 2011-07-15
EP2146820B1 (en) 2011-07-13
WO2008125368A1 (en) 2008-10-23
CN101657297A (en) 2010-02-24
US8113922B2 (en) 2012-02-14
DE102007017243A1 (en) 2008-10-16
RU2009141525A (en) 2011-05-20

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