EP2252431B1 - Hand-held machine tool, in particular hand-guided grinding machine - Google Patents

Hand-held machine tool, in particular hand-guided grinding machine Download PDF

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Publication number
EP2252431B1
EP2252431B1 EP08873486A EP08873486A EP2252431B1 EP 2252431 B1 EP2252431 B1 EP 2252431B1 EP 08873486 A EP08873486 A EP 08873486A EP 08873486 A EP08873486 A EP 08873486A EP 2252431 B1 EP2252431 B1 EP 2252431B1
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EP
European Patent Office
Prior art keywords
connecting piece
housing
power tool
portable power
tool according
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EP08873486A
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German (de)
French (fr)
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EP2252431A1 (en
Inventor
Balazs Bogardi
Roland Kaplar
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2252431A1 publication Critical patent/EP2252431A1/en
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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
    • 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 hand tool, in particular a hand-held grinding machine according to the preamble of claim 1.
  • An angle grinder which has in a housing a drive motor for rotatably driving a tool shaft to which a grinding tool is attached.
  • Such angle grinder are usually driven by an electric motor, wherein the drive shaft of the electric drive motor is arranged perpendicular to the tool shaft and is coupled thereto via a transmission.
  • the housing of the angle grinder is exposed to considerable stresses during operation, which originate from the vibrations of the drive motor and from the contact between the grinding tool and the workpiece to be machined. Therefore, in addition to a simple installation and to pay attention to a high stability.
  • lubricants which are used in particular for supporting the drive shaft and the tool shaft, heat up during operation and liquefy thereby causing the risk of an undesired escape of the lubricant.
  • the angle grinder has a two-part housing with a motor housing and a gear housing, wherein the gear housing has at its connectable to the motor housing end a recess to be brought into engagement with the ribs of the motor housing.
  • the motor housing accommodates a drive motor whose drive shaft drives a tool shaft via a gear, wherein the gear and the tool shaft are arranged in the gear housing.
  • the invention is based on the object on the one hand to simplify the assembly of a hand tool and on the other hand, in particular to form the housing of the power tool stable.
  • the hand tool according to the invention which is in particular a hand-held grinding machine such as an angle grinder, is provided with an at least two-part housing, wherein the two housing parts of the power tool to be connected to each other via a connecting device.
  • the connecting device has a plug-in connection, which comprises a connection piece on the first housing part and a counterpart connection piece on the second housing part, wherein connection piece and counterpart connection engage one another positively in the mounted position.
  • At least a portion of the nozzle is provided with a draft, which forms an angle relative to the nozzle longitudinal axis, wherein the counter-nozzle is adapted to the draft.
  • This embodiment has the advantage that the connection between the housing parts due to the draft, which occupies an angle relative to the mounting direction, can be produced in a simple manner.
  • the merging of the housing parts during assembly takes place in the direction of the nozzle longitudinal axis, wherein the draft angle ensures an automatic centering of the housing parts.
  • the assembly is thereby considerably simplified.
  • the draft can either be formed on the nozzle itself by adopting a cone shape according to an advantageous embodiment, the cone extending either over the entire axial length of the nozzle or, according to another embodiment, only over an axial portion, wherein the non-conical Part-section, for example, cylindrical.
  • Erfindungsgemä ⁇ an axially projecting draft is integrally formed on the neck, which forms an angle with the nozzle longitudinal axis.
  • the draft which is formed integrally with the neck, the angled portion which is inclined relative to the nozzle longitudinal axis, which also represents the mounting direction at an angle.
  • the nozzle provided with the axially projecting draft can either be cylindrical in itself or cone-shaped, the cone angle advantageously coinciding with the angle of the draft, but possibly also deviating therefrom, in particular having a smaller cone angle than the draft.
  • a plurality of draft angles are formed on the nozzle and corresponding guide recesses on the guide stub, wherein the drafted form rising axially over the neck. This results in the mounted position in the circumferential direction a positive interlocking between the nozzle and counter-nozzle.
  • connection piece and the counterpart connection are designed according to the invention for receiving the drive shaft of a drive motor of the handheld power tool.
  • the connector has the additional task of supporting the drive shaft.
  • the drive shaft is passed through the nozzle or the counterpart and coupled via a gear with the tool shaft.
  • the nozzle or the counter-nozzle also causes storage and stabilization of the drive shaft, including in particular a pivot bearing is inserted into the nozzle.
  • the sealing ring expediently has a minimum hardness of 40 Shore A in order to ensure sufficient tightness on the loads occurring during operation.
  • the two housing parts to be connected according to the invention are a motor housing in which the drive motor is accommodated, as well as a gear housing in which the tool shaft is mounted for driving the tool.
  • the motor housing is advantageously made of plastic, whereas the gear housing may be made of light metal, for example aluminum.
  • the motor housing is made in several parts, for example, by two half-shells are provided, which are interconnected and supplemented to the motor housing, which is connected to the transmission housing via the connector.
  • hand tool 1 is designed as an angle grinder, which has a two-part housing with a motor housing 2 and a transmission housing 3.
  • a motor housing 2 In the motor housing 2, an electric drive motor 4 is received, in the gear housing 3, a tool shaft 7 is rotatably mounted, on which the grinding tool 8 is fixed.
  • a protective cover 10 On a bearing flange 9 on the gear housing 3, a protective cover 10 is additionally attached, which engages over the tool 8.
  • the drive or armature shaft 5 of the electric drive motor 4 extends at right angles to the tool shaft 7 and is rotationally coupled to the tool shaft 7 via a gear 6 located in the gear housing 3.
  • the motor housing 2 and the gear housing 3 are connected to one another via a connecting device 11 designed as a plug connection, which is described in more detail in the following figures.
  • FIG. 3 comprises the connector designed as a connector 11 comprises a nozzle 12 which is integrally formed on the transmission housing 3, and an associated counter-pipe 13 which is integrally formed with the motor housing 2.
  • the mounting direction at the same time represents the axial direction of the nozzle 12 and counter-stub 13. This axial direction coincides with the axial direction of the drive or armature shaft of the motor, through the opening in the nozzle 12 and Counter stub 13 is guided.
  • Stub 12 and counter-stub 13 are substantially cylindrical or hollow cylindrical, but at least in sections, they have a small cone angle, in such a way that taper the tapered portions of the nozzle 12 and counter-stub 13 in the direction of the transmission housing 3. This centering and easier assembly of these two housing components is achieved in the assembly of the motor housing 2 and the gear housing 3.
  • each drafted slope 14 is assigned in each case a guide recess 15 on the side of the opposing neck 13 on the motor housing 2 (FIG. Fig. 3 and Fig. 4 ), the is formed complementary to the draft, wherein in the mounted position, the draft 14 protrude into the guide grooves 15 and is given a positive fit in the circumferential direction.
  • both the nozzle 12 including the draft 14 and the counter-nozzle 13 with the guide recesses 15 are completely formed, ie over their respective axial length, with a cone angle.
  • a rotary bearing 16 is inserted into the recess in the counter-nozzle 13 on the motor housing 2, in which the drive shaft is rotatably mounted.
  • the counter-pipe 13 is formed on a cross-strut 17, which is integrally formed with the motor housing 2 and extending from a side wall of the motor housing 2, starting in the transverse direction.
  • the inner wall of the nozzle 12 and the outer wall of the nozzle 13 is conical with a cone angle ⁇ , which is expediently less than 20 ° and in the embodiment is about 10 °.
  • the inner wall of the die neck 12 is over the entire axial length including the draft 14 ( Fig. 6
  • the inner wall of the counter-nozzle 13, in which the pivot bearing 16 is inserted, is cylindrical.

Description

Die Erfindung bezieht sich auf eine Handwerkzeugmaschine, insbesondere eine handgeführte Schleifmaschine nach dem Oberbegriff des Anspruches 1.The invention relates to a hand tool, in particular a hand-held grinding machine according to the preamble of claim 1.

Stand der TechnikState of the art

Aus der EP 0 583 270 B1 ist ein Winkelschleifer bekannt, der in einem Gehäuse einen Antriebsmotor zum drehbaren Antrieb einer Werkzeugwelle aufweist, an der ein Schleifwerkzeug befestigt ist. Derartige Winkelschleifer werden üblicherweise elektromotorisch angetrieben, wobei die Antriebswelle des elektrischen Antriebsmotors senkrecht zur Werkzeugwelle angeordnet ist und mit dieser über ein Getriebe gekoppelt ist.From the EP 0 583 270 B1 An angle grinder is known which has in a housing a drive motor for rotatably driving a tool shaft to which a grinding tool is attached. Such angle grinder are usually driven by an electric motor, wherein the drive shaft of the electric drive motor is arranged perpendicular to the tool shaft and is coupled thereto via a transmission.

Das Gehäuse des Winkelschleifers ist während des Betriebs erheblichen Belastungen ausgesetzt, die zum einen von den Schwingungen des Antriebsmotors und zum andern von dem Kontakt zwischen Schleifwerkzeug und zu bearbeitendem Werkstück stammen. Daher ist neben einer einfachen Montage auch auf eine hohe Stabilität zu achten.The housing of the angle grinder is exposed to considerable stresses during operation, which originate from the vibrations of the drive motor and from the contact between the grinding tool and the workpiece to be machined. Therefore, in addition to a simple installation and to pay attention to a high stability.

Des Weiteren muss berücksichtigt werden, dass sich Schmierstoffe, die insbesondere zur Lagerung der Antriebswelle und der Werkzeugwelle eingesetzt werden, im Betrieb erwärmen und hierdurch verflüssigen, wodurch die Gefahr eines unerwünschten Austretens des Schmierstoffes besteht.Furthermore, it has to be taken into account that lubricants, which are used in particular for supporting the drive shaft and the tool shaft, heat up during operation and liquefy thereby causing the risk of an undesired escape of the lubricant.

Ein weiterer Winkelschleifer wird in der DE 100 00 700 A1 beschrieben. Der Winkelschleifer weist ein zweigeteiltes Gehäuse mit einem Motorgehäuse und einem Getriebegehäuse auf, wobei das Getriebegehäuse an seinem mit dem Motorgehäuse verbindbaren Ende einen Einstich aufweist, mit dem Rippen des Motorgehäuses in Eingriff zu bringen sind. Hierdurch wird eine formschlüssige Verbindung zwischen Motor- und Getriebegehäuse erreicht. Das Motorgehäuse nimmt einen Antriebsmotor auf, dessen Antriebswelle über ein Getriebe eine Werkzeugwelle antreibt, wobei das Getriebe und die Werkzeugwelle im Getriebegehäuse angeordnet sind.Another angle grinder will be in the DE 100 00 700 A1 described. The angle grinder has a two-part housing with a motor housing and a gear housing, wherein the gear housing has at its connectable to the motor housing end a recess to be brought into engagement with the ribs of the motor housing. As a result, a positive connection between engine and Transmission housing reached. The motor housing accommodates a drive motor whose drive shaft drives a tool shaft via a gear, wherein the gear and the tool shaft are arranged in the gear housing.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zu Grunde, zum einen die Montage einer Handwerkzeugmaschine zu vereinfachen und zum anderen insbesondere das Gehäuse der Handwerkzeugmaschine stabil auszubilden.The invention is based on the object on the one hand to simplify the assembly of a hand tool and on the other hand, in particular to form the housing of the power tool stable.

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 Handwerkzeugmaschine, bei der es sich insbesondere um eine handgeführte Schleifmaschine wie beispielsweise einen Winkelschleifer handelt, ist mit einem mindestens zweiteiligen Gehäuse versehen, wobei die beiden Gehäuseteile der Handwerkzeugmaschine über eine Verbindungseinrichtung miteinander zu verbinden sind. Die Verbindungseinrichtung weist eine Steckverbindung auf, die einen Stutzen am ersten Gehäuseteil und einen Gegenstutzen am zweiten Gehäuseteil umfasst, wobei Stutzen und Gegenstutzen in der montierten Position formschlüssig ineinander greifen. Zumindest ein Teil des Stutzens ist mit einer Formschräge versehen, die gegenüber der Stutzenlängsachse einen Winkel einschließt, wobei der Gegenstutzen an die Formschräge angepasst ist.The hand tool according to the invention, which is in particular a hand-held grinding machine such as an angle grinder, is provided with an at least two-part housing, wherein the two housing parts of the power tool to be connected to each other via a connecting device. The connecting device has a plug-in connection, which comprises a connection piece on the first housing part and a counterpart connection piece on the second housing part, wherein connection piece and counterpart connection engage one another positively in the mounted position. At least a portion of the nozzle is provided with a draft, which forms an angle relative to the nozzle longitudinal axis, wherein the counter-nozzle is adapted to the draft.

Diese Ausführung hat den Vorteil, dass die Verbindung zwischen den Gehäuseteilen auf Grund der Formschräge, welche gegenüber der Montagerichtung einen Winkel einnimmt, in einfacher Weise hergestellt werden kann. Das Zusammenführen der Gehäuseteile während der Montage erfolgt in Richtung der Stutzenlängsachse, wobei die Formschräge für eine selbsttätige Zentrierung der Gehäuseteile sorgt. Die Montage wird hierdurch erheblich vereinfacht.This embodiment has the advantage that the connection between the housing parts due to the draft, which occupies an angle relative to the mounting direction, can be produced in a simple manner. The merging of the housing parts during assembly takes place in the direction of the nozzle longitudinal axis, wherein the draft angle ensures an automatic centering of the housing parts. The assembly is thereby considerably simplified.

Zugleich wird über die Zentrierung eine Verbesserung der Stabilität erreicht, da die beiden Gehäuseteile in der montierten Lage fest ineinander greifen, was über den Formschluss, welcher die Gehäuseteile gegen Verdrehung sichert, noch gesteigert wird.At the same time an improvement in the stability is achieved via the centering, since the two housing parts in the mounted position firmly interlock, which on the positive locking, which ensures the housing parts against rotation, is still increased.

Die Formschräge kann entweder am Stutzen selbst ausgebildet sein, indem dieser gemäß einer vorteilhaften Ausführung Konusform einnimmt, wobei der Konus sich entweder über die gesamte axiale Länge des Stutzens erstrecken oder aber, gemäß anderer Ausführung, nur über einen axialen Teilabschnitt, wobei der nicht-konische Teil-abschnitt beispielsweise zylindrisch ausgebildet ist. Erfindungsgemäβ ist an den Stutzen eine axial überstehende Formschräge angeformt, die mit der Stutzenlängsachse einen Winkel einschließt. Dabei bildet die Formschräge, die einteilig mit dem Stutzen ausgebildet ist, den winkligen Abschnitt, der gegenüber der Stutzenlängsachse, welche zugleich die Montagerichtung darstellt, unter einem Winkel geneigt ist. Am Gegenstutzen sind auf die Formschräge angepasste Führungsausnehmungen vorgesehen. Der mit der axial überstehenden Formschräge versehene Stutzen kann entweder selbst zylindrisch ausgebildet sein oder konusförmig, wobei der Konuswinkel vorteilhafterweise mit dem Winkel der Formschräge übereinstimmt, ggf. aber auch hiervon abweicht, insbesondere einen kleineren Konuswinkel aufweist als die Formschräge.The draft can either be formed on the nozzle itself by adopting a cone shape according to an advantageous embodiment, the cone extending either over the entire axial length of the nozzle or, according to another embodiment, only over an axial portion, wherein the non-conical Part-section, for example, cylindrical. Erfindungsgemäβ an axially projecting draft is integrally formed on the neck, which forms an angle with the nozzle longitudinal axis. In this case, the draft, which is formed integrally with the neck, the angled portion which is inclined relative to the nozzle longitudinal axis, which also represents the mounting direction at an angle. At the opposite nozzle guide recesses adapted to the draft are provided. The nozzle provided with the axially projecting draft can either be cylindrical in itself or cone-shaped, the cone angle advantageously coinciding with the angle of the draft, but possibly also deviating therefrom, in particular having a smaller cone angle than the draft.

Über den Umfang verteilt sind vorteilhaft mehrere Formschrägen an dem Stutzen und entsprechende Führungsausnehmungen am Führungsstutzen ausgebildet, wobei sich die Formschrägen axial über den Stutzen erheben. Dadurch ergibt sich in der montierten Lage in Umfangsrichtung eine formschlüssige Verzahnung zwischen Stutzen und Gegenstutzen.Distributed over the circumference advantageously a plurality of draft angles are formed on the nozzle and corresponding guide recesses on the guide stub, wherein the drafted form rising axially over the neck. This results in the mounted position in the circumferential direction a positive interlocking between the nozzle and counter-nozzle.

Der Stutzen und der Gegenstutzen sind erfindungsgemäβ zur Aufnahme der Antriebswelle eines Antriebsmotors der Handwerkzeugmaschine ausgebildet. Damit kommt der Steckverbindung die zusätzliche Aufgabe der Lagerung der Antriebswelle zu. Die Antriebswelle ist durch den Stutzen bzw. den Gegenstutzen hindurch geführt und über ein Getriebe mit der Werkzeugwelle gekoppelt. Der Stutzen bzw. der Gegenstutzen bewirkt zugleich eine Lagerung und Stabilisierung der Antriebswelle, wozu insbesondere auch ein Drehlager in den Stutzen eingesetzt ist. Außerdem kann es zweckmäßig sein, einen zusätzlichen Dichtring vorzusehen, der zwischen dem Umfang des Drehlagers und der Innenwandung des Stutzens positioniert ist und einen Übertritt verflüssigten Schmiermittels, insbesondere Schmieröls verhindert. Der Dichtring weist zweckmäßigerweise eine Mindesthärte von 40 Shore A auf, um auf den im Betrieb auftretenden Belastungen eine hinreichende Dichtigkeit zu gewährleisten.The connection piece and the counterpart connection are designed according to the invention for receiving the drive shaft of a drive motor of the handheld power tool. Thus, the connector has the additional task of supporting the drive shaft. The drive shaft is passed through the nozzle or the counterpart and coupled via a gear with the tool shaft. The nozzle or the counter-nozzle also causes storage and stabilization of the drive shaft, including in particular a pivot bearing is inserted into the nozzle. In addition, it may be appropriate to provide an additional sealing ring which is positioned between the circumference of the pivot bearing and the inner wall of the nozzle and prevents a transfer of liquefied lubricant, in particular lubricating oil. The sealing ring expediently has a minimum hardness of 40 Shore A in order to ensure sufficient tightness on the loads occurring during operation.

Bei den beiden zu verbindenden Gehäuseteilen handelt es sich erfindungsgemäβ um ein Motorgehäuse, in dem der Antriebsmotor aufgenommen ist, sowie um ein Getriebegehäuse, in dem die Werkzeugwelle zum Antrieb des Werkzeuges gelagert ist. Das Motorgehäuse besteht vorteilhafterweise aus Kunststoff, wohingegen das Getriebegehäuse aus Leichtmetall gefertigt sein kann, beispielsweise aus Aluminium. Gegebenenfalls ist das Motorgehäuse mehrteilig ausgeführt, indem beispielsweise zwei Halbschalen vorgesehen sind, die miteinander verbunden werden und zu dem Motorgehäuse ergänzt werden, welches mit dem Getriebegehäuse über die Steckverbindung verbunden wird.The two housing parts to be connected according to the invention are a motor housing in which the drive motor is accommodated, as well as a gear housing in which the tool shaft is mounted for driving the tool. The motor housing is advantageously made of plastic, whereas the gear housing may be made of light metal, for example aluminum. Optionally, the motor housing is made in several parts, for example, by two half-shells are provided, which are interconnected and supplemented to the motor housing, which is connected to the transmission housing via the connector.

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

Fig.1
eine Schnittdarstellung einer als Winkelschleifer ausgebildeten Handwerkzeugmaschine mit einem Motorgehäuse zur Aufnahme des Antriebsmotors und einem Getriebegehäuse zur Aufnahme der Werkzeugwelle,
Fig. 2
eine perspektivische Ansicht des Getriebegehäuses sowie des mit dem Getriebegehäuse zu verbindenden Abschnittes des Motorgehäuses, dargestellt in einer angenäherten Position während der Montage,
Fig. 3
eine Fig. 2 entsprechende Darstellung, jedoch in montierter Position von Motor- und Getriebegehäuse,
Fig. 4
eine Einzeldarstellung eines Ausschnittes des Motorgehäuses aus dem Bereich der Verbindung zum Getriebegehäuse,
Fig. 5
eine stirnseitige Ansicht des Getriebegehäuses mit montiertem Abschnitt des Motorgehäuses,
Fig. 6
eine Schnittdarstellung gemäß Schnittlinie VI-VI aus Fig. 5,
Fig. 7
eine Schnittdarstellung gemäß Schnittlinie VII-VII aus Fig. 5.
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 sectional view of a designed as angle grinder hand tool with a motor housing for receiving the drive motor and a gear housing for receiving the tool shaft,
Fig. 2
a perspective view of the gear housing and the housing to be connected to the transmission housing of the motor housing, shown in an approximate position during assembly,
Fig. 3
a Fig. 2 corresponding representation, but in mounted position of engine and gearbox housing,
Fig. 4
a detailed representation of a section of the motor housing from the region of the connection to the transmission housing,
Fig. 5
an end view of the gear housing with mounted portion of the motor housing,
Fig. 6
a sectional view along section line VI-VI from Fig. 5 .
Fig. 7
a sectional view along section line VII-VII from Fig. 5 ,

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 dargestellte Handwerkzeugmaschine 1 ist als Winkelschleifer ausgebildet, der ein zweiteiliges Gehäuse mit einem Motorgehäuse 2 und einem Getriebegehäuse 3 aufweist. Im Motorgehäuse 2 ist ein elektrischer Antriebsmotor 4 aufgenommen, im Getriebegehäuse 3 ist eine Werkzeugwelle 7 drehbar gelagert, an der das Schleifwerkzeug 8 befestigt ist. An einem Lagerflansch 9 am Getriebegehäuse 3 ist zusätzlich eine Schutzhaube 10 befestigt, die das Werkzeug 8 übergreift.In the Fig. 1 shown hand tool 1 is designed as an angle grinder, which has a two-part housing with a motor housing 2 and a transmission housing 3. In the motor housing 2, an electric drive motor 4 is received, in the gear housing 3, a tool shaft 7 is rotatably mounted, on which the grinding tool 8 is fixed. On a bearing flange 9 on the gear housing 3, a protective cover 10 is additionally attached, which engages over the tool 8.

Die Antriebs- bzw. Ankerwelle 5 des elektrischen Antriebsmotors 4 verläuft rechtwinklig zur Werkzeugwelle 7 und ist über ein im Getriebegehäuse 3 befindliches Getriebe 6 mit der Werkzeugwelle 7 drehgekoppelt. Das Motorgehäuse 2 und das Getriebegehäuse 3 sind über eine als Steckverbindung ausgeführte Verbindungseinrichtung 11 miteinander verbunden, die in den folgenden Figuren näher beschrieben wird.The drive or armature shaft 5 of the electric drive motor 4 extends at right angles to the tool shaft 7 and is rotationally coupled to the tool shaft 7 via a gear 6 located in the gear housing 3. The motor housing 2 and the gear housing 3 are connected to one another via a connecting device 11 designed as a plug connection, which is described in more detail in the following figures.

Wie den Figuren 2 und 3 zu entnehmen ist, umfasst die als Steckverbindung ausgeführte Verbindungseinrichtung 11 einen Stutzen 12, welcher einteilig am Getriebegehäuse 3 ausgebildet ist, sowie einen zugeordneten Gegenstutzen 13, welcher einteilig mit dem Motorgehäuse 2 ausgebildet ist. In der montierten Position (Fig. 3) sind Stutzen 12 und Gegenstutzen 13 ineinander gesteckt, die Montagerichtung stellt zugleich die Achsrichtung von Stutzen 12 bzw. Gegenstutzen 13 dar. Diese Achsrichtung fällt zusammen mit der Achsrichtung der Antriebs- bzw. Ankerwelle des Motors, die durch die Öffnung im Stutzen 12 bzw. Gegenstutzen 13 geführt ist. Stutzen 12 und Gegenstutzen 13 sind im Wesentlichen zylindrisch bzw. hohlzylindrisch ausgebildet, sie weisen jedoch zumindest abschnittsweise einen geringen Konuswinkel auf, und zwar in der Weise, dass sich die konusförmigen Abschnitte am Stutzen 12 bzw. Gegenstutzen 13 in Richtung auf das Getriebegehäuse 3 verjüngen. Damit wird bei der Montage von Motorgehäuse 2 und Getriebegehäuse 3 eine Zentrierung und erleichterte Montage dieser beiden Gehäusebauteile erreicht.Like that Figures 2 and 3 can be seen, comprises the connector designed as a connector 11 comprises a nozzle 12 which is integrally formed on the transmission housing 3, and an associated counter-pipe 13 which is integrally formed with the motor housing 2. In the assembled position ( Fig. 3 Stem 12 and counter-stub 13 are inserted into each other, the mounting direction at the same time represents the axial direction of the nozzle 12 and counter-stub 13. This axial direction coincides with the axial direction of the drive or armature shaft of the motor, through the opening in the nozzle 12 and Counter stub 13 is guided. Stub 12 and counter-stub 13 are substantially cylindrical or hollow cylindrical, but at least in sections, they have a small cone angle, in such a way that taper the tapered portions of the nozzle 12 and counter-stub 13 in the direction of the transmission housing 3. This centering and easier assembly of these two housing components is achieved in the assembly of the motor housing 2 and the gear housing 3.

Am Stutzen 12 am Getriebegehäuse 3 sind axial überstehende Formschrägen 14 vorgesehen, die sich jeweils über ein Winkelsegment in Umfangsrichtung des Stutzens 12 erstrecken. Vorgesehen sind im Ausführungsbeispiel insgesamt vier derartige Formschrägen 14. Jeder Formschräge 14 ist auf Seiten des Gegenstutzens 13 am Motorgehäuse 2 jeweils eine Führungsausnehmung 15 zugeordnet (Fig. 3 und Fig. 4), die komplementär zur Formschräge ausgebildet ist, wobei in der montierten Position die Formschrägen 14 in die Führungsausnehmungen 15 einragen und in Umfangsrichtung ein Formschluss gegeben ist. Es kann grundsätzlich ausreichend sein, lediglich die Formschrägen 14 bzw. die Führungsausnehmungen 15 mit einem Konuswinkel gegenüber der Achse von Stutzen und Gegenstutzen auszubilden und den Stutzen 12 selbst bzw. den Gegenstutzen zylindrisch auszuführen. Gemäß einer alternativen Ausführung sind aber sowohl der Stutzen 12 einschließlich der Formschrägen 14 als auch der Gegenstutzen 13 mit den Führungsausnehmungen 15 vollständig, also über ihre jeweilige axiale Länge, mit einem Konuswinkel ausgebildet.On the nozzle 12 on the gear housing 3 axially projecting draft slopes 14 are provided, each extending over an angular segment in the circumferential direction of the nozzle 12. In the exemplary embodiment, a total of four such drafted slopes 14 are provided. Each drafted slope 14 is assigned in each case a guide recess 15 on the side of the opposing neck 13 on the motor housing 2 (FIG. Fig. 3 and Fig. 4 ), the is formed complementary to the draft, wherein in the mounted position, the draft 14 protrude into the guide grooves 15 and is given a positive fit in the circumferential direction. In principle, it may be sufficient to design only the drafted shapes 14 or the guide cutouts 15 with a cone angle relative to the axis of the connection piece and counterpart connection and to make the connection piece 12 itself or the counterpart connection cylindrical. According to an alternative embodiment, however, both the nozzle 12 including the draft 14 and the counter-nozzle 13 with the guide recesses 15 are completely formed, ie over their respective axial length, with a cone angle.

Wie den Figuren 2 bis 4 weiter zu entnehmen, ist in die Ausnehmung im Gegenstutzen 13 am Motorgehäuse 2 ein Drehlager 16 eingesetzt, in welchem die Antriebswelle drehbar gelagert wird. Der Gegenstutzen 13 ist an einer Querstrebe 17 ausgebildet, die einteilig mit dem Motorgehäuse 2 ausgebildet ist und sich von einer Seitenwand des Motorgehäuses 2 ausgehend in Querrichtung erstreckt.Like that FIGS. 2 to 4 can be seen further, a rotary bearing 16 is inserted into the recess in the counter-nozzle 13 on the motor housing 2, in which the drive shaft is rotatably mounted. The counter-pipe 13 is formed on a cross-strut 17, which is integrally formed with the motor housing 2 and extending from a side wall of the motor housing 2, starting in the transverse direction.

Wie den Figuren 5 bis 7 zu entnehmen, ist die Innenwand des Stutzens 12 sowie die Außenwand des Gegenstutzens 13 konusförmig ausgebildet mit einem Konuswinkel α, der zweckmäßigerweise kleiner als 20° ist und im Ausführungsbeispiel etwa 10° beträgt. Die Innenwand des Formstutzens 12 ist über die gesamte axiale Länge einschließlich der Formschräge 14 (Fig. 6) konusförmig ausgebildet, die Außenwand des Gegenstutzens 13 dagegen nur über die axiale Länge der Führungsausnehmungen 15. Die Innenwand des Gegenstutzens 13, in die das Drehlager 16 eingesetzt ist, ist zylindrisch ausgeführt.Like that FIGS. 5 to 7 can be seen, the inner wall of the nozzle 12 and the outer wall of the nozzle 13 is conical with a cone angle α, which is expediently less than 20 ° and in the embodiment is about 10 °. The inner wall of the die neck 12 is over the entire axial length including the draft 14 ( Fig. 6 Conversely, the outer wall of the counter-nozzle 13, however, only over the axial length of the guide recesses 15. The inner wall of the counter-nozzle 13, in which the pivot bearing 16 is inserted, is cylindrical.

Claims (10)

  1. Portable power tool, in particular a hand-held grinding machine, wherein the housing of the portable power tool (1) comprises two housing parts (2, 3), namely a motor housing (2) for accommodating a drive motor (4) and a transmission housing (3) for accommodating a tool shaft (7), which are connected to one another via a connecting device (11), characterized in that the connecting device (11) comprises a plug connection with a connecting piece (12) on the first housing part (3) and a counterpart connecting piece (13) on the second housing part (2), wherein the connecting piece (12) and counterpart connecting piece (13) engage in one another in the assembled position, in that at least part of the connecting piece (12) and the counterpart connecting piece (13) is designed to be angular with respect to the connecting piece longitudinal axis, in that at least one axially projecting shaped incline (14) is integrally formed on the connecting piece (12) and encloses an angle (α) with the connecting piece longitudinal axis, wherein the counterpart connecting piece (13) comprises at least one guide recess (15) adapted to the shaped incline (14), and in that the connecting piece (12) and the counterpart connecting piece (13) are designed to accommodate the drive shaft of the drive motor (4).
  2. Portable power tool according to Claim 1, characterized in that a plurality of shaped inclines (14) on the connecting piece (12) and corresponding guide recesses (15) on the counterpart connecting piece (13) are provided in a distributed manner over the periphery.
  3. Portable power tool according to Claim 1 or 2, characterized in that the connecting piece (12) and the counterpart connecting piece (13) have a conical design at least in certain portions.
  4. Portable power tool according to one of Claims 1 to 3, characterized in that the angle (α) is at most 20°.
  5. Portable power tool according to Claim 3 or 4, characterized in that, like the connecting piece (12), the shaped incline (14) is designed to be conical at least in certain portions.
  6. Portable power tool according to one of Claims 1 to 5, characterized in that a rotary bearing (16) for the drive shaft is inserted into the connecting piece (12).
  7. Portable power tool according to one of Claims 1 to 6, characterized in that a sealing ring is inserted into the connecting piece (12).
  8. Portable power tool according to Claim 7, characterized in that the sealing ring has a Shore A hardness of at least 40.
  9. Portable power tool according to one of Claims 1 to 8, characterized in that the motor housing (2) is manufactured from plastic.
  10. Portable power tool according to one of Claims 1 to 9, characterized in that the transmission mechanism housing (3) is manufactured from light metal, in particular from aluminium.
EP08873486A 2008-03-18 2008-11-18 Hand-held machine tool, in particular hand-guided grinding machine Active EP2252431B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000737A DE102008000737A1 (en) 2008-03-18 2008-03-18 Hand tool, in particular hand-guided grinding machine
PCT/EP2008/065710 WO2009115143A1 (en) 2008-03-18 2008-11-18 Hand-held machine tool, in particular hand-guided grinding machine

Publications (2)

Publication Number Publication Date
EP2252431A1 EP2252431A1 (en) 2010-11-24
EP2252431B1 true EP2252431B1 (en) 2012-10-17

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EP08873486A Active EP2252431B1 (en) 2008-03-18 2008-11-18 Hand-held machine tool, in particular hand-guided grinding machine

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US (1) US20110021120A1 (en)
EP (1) EP2252431B1 (en)
CN (1) CN101977730A (en)
DE (1) DE102008000737A1 (en)
WO (1) WO2009115143A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5853761B2 (en) * 2012-02-24 2016-02-09 日産自動車株式会社 Driving force transmission device
DE102012103935B4 (en) * 2012-05-04 2015-03-19 C. & E. Fein Gmbh Housing with switch cover
EP2821184B1 (en) 2013-07-05 2018-12-26 Black & Decker Inc. Hammer Drill
DE102014210915A1 (en) * 2014-06-06 2015-12-17 Robert Bosch Gmbh Power tool
US11396078B2 (en) * 2019-06-10 2022-07-26 Makita Corporation Grinder

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266376A (en) * 1979-02-09 1981-05-12 Black & Decker Inc. Portable electrically energized surface finishing tool
DE4102482A1 (en) * 1991-01-29 1992-07-30 Bosch Gmbh Robert HAND MACHINE TOOL
DE4113641A1 (en) * 1991-04-26 1992-10-29 Bosch Gmbh Robert HAND MACHINE TOOL
DE4113820A1 (en) 1991-04-27 1992-10-29 Boehringer Mannheim Gmbh USE OF TORASEMIDE FOR THE TREATMENT OF HIRNOEDEMES
US5642008A (en) * 1995-10-20 1997-06-24 Waxing Corporation Of America, Inc. Power tool motor assembly
DE10000700A1 (en) 2000-01-10 2001-07-12 Bosch Gmbh Robert Angle grinder
DE102004016171A1 (en) * 2004-03-30 2005-10-20 Bosch Gmbh Robert Hand tool
DE102005061870A1 (en) * 2005-12-23 2007-07-05 Robert Bosch Gmbh Electric-powered hand tool e.g. rotary sanding or polishing tool has two-part housing with one overlapping half linked to the other by vibration dampener
JP4962896B2 (en) * 2006-03-10 2012-06-27 日立工機株式会社 Power tool

Also Published As

Publication number Publication date
CN101977730A (en) 2011-02-16
EP2252431A1 (en) 2010-11-24
DE102008000737A1 (en) 2009-09-24
WO2009115143A1 (en) 2009-09-24
US20110021120A1 (en) 2011-01-27

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