EP2139654B1 - Motor-driven machine tool - Google Patents

Motor-driven machine tool Download PDF

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Publication number
EP2139654B1
EP2139654B1 EP08716952.0A EP08716952A EP2139654B1 EP 2139654 B1 EP2139654 B1 EP 2139654B1 EP 08716952 A EP08716952 A EP 08716952A EP 2139654 B1 EP2139654 B1 EP 2139654B1
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EP
European Patent Office
Prior art keywords
eccentric
output shaft
tool
machine tool
coupling member
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Not-in-force
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EP08716952.0A
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German (de)
French (fr)
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EP2139654A1 (en
Inventor
Adolf Zaiser
Jens Blum
Heiko Roehm
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP2139654A1 publication Critical patent/EP2139654A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B19/00—Other reciprocating saws with power drive; Fret-saws
    • B27B19/006—Other reciprocating saws with power drive; Fret-saws with oscillating saw blades; Hand saws with oscillating saw blades
    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor

Definitions

  • the invention relates to a motor-driven machine tool with a drive shaft driven by a drive unit and an output shaft on which the tool is received, according to the preamble of claim 1.
  • a machine tool is the DE 42 03 090 C1 refer to.
  • a hand tool machine is described with an oscillating drivable working shaft, on which a tool is received, wherein the oscillating drive leads to a rotary pendulum motion of the tool, which can be used both for grinding and for cutting.
  • the work or tool shaft with the tool is driven by a non-rotatably connected arm, which cooperates as part of a Exzenterkoppel founded with an eccentric, which is driven by an electric motor.
  • the DE 42 03 890 C1 shows a hand-held cutter with an electric drive motor, the rotor shaft carries an eccentric cam, which cooperates with a pivot lever with a fork, wherein the pivot lever is disposed on an output shaft, at the free end of a tool is attached.
  • the rotational movement of the rotor shaft 11 is transmitted via the eccentric cam and the pivot lever in an oscillating rotational movement of the output shaft.
  • the rotor shaft and the output shaft are parallel to each other.
  • the pivot lever is located in the region of the tool facing away from the end face on the output shaft.
  • the output shaft thus represents the parallel offset, axial extension of the rotor shaft. Overall, this results in a relatively large space requirement in the axial direction.
  • the invention has for its object to provide a compact, motor-driven machine tool with pendulum to be driven tool.
  • the motor-driven machine tool which is in particular a hand tool whose tool performs a rotary pendulum movement, has parallel to each other arranged input and output shafts, which is additionally provided that the output shaft extends at least partially in height and parallel to the drive unit.
  • Another advantage of the parallel arrangement is that the motion transmission between the input and output shaft due to the parallel axes of rotation without play or at least with reduced clearance is feasible.
  • a linear or planar contact of the components participating in the eccentric coupling device between the input and output shafts is possible with one another; a point-like power transmission, which occurs for example in the prior art at an angle arranged waves and locally high force loads with the risk of increased play can be avoided.
  • the eccentric coupling device comprises a coupling member and an eccentric member, which are each arranged on different shafts, wherein the coupling member preferably on the Output shaft and the eccentric advantageous sitting on the drive shaft.
  • the rotational movement of the revolving eccentric member is transmitted via the coupling member in the rotary pendulum movement of the output shaft. Due to the parallel arrangement of the drive and output shaft, a linear or flat contact between the coupling member and the eccentric member can be realized.
  • the eccentric member is expediently designed as eccentric cam, whose contour is scanned by the coupling member.
  • the coupling member is designed, for example fork-shaped, wherein the two forks engage around the eccentric member.
  • the planar or linear contact between coupling member and eccentric member is effected in particular by part-circular or possibly also circular formation of the contiguous contours of both components.
  • the linear or planar system allows a better distribution of the forces to be transmitted and thus a lower punctual load.
  • the coupling member of the coupling device is arranged adjacent to the tool on the output shaft.
  • the drive unit is designed as an electric motor and the stator of the electric motor is arranged on the side facing away from the tool in the housing of the machine tool.
  • the positioning of the coupling device on the side facing the tool allows a correspondingly short design of the output shaft, which is still supported by the fact that the drive shaft is also located on the side facing the tool and is rotationally urged by the drive unit.
  • the installation space length is primarily determined by the drive unit, that is, as a rule, by the electric motor.
  • hand tool 1 comprises in a housing 9 an electric drive motor 2, consisting of a housing-fixed stator 3 and an armature or rotor 4, on the rotatably and coaxially a drive shaft 5 is arranged.
  • the rotational movement of the drive shaft 5 is transmitted via an eccentric coupling 8 to an output shaft 6, which carries a tool 7.
  • the eccentric coupling 8 By means of the eccentric coupling 8, the rotary movement of the drive shaft 5 is transmitted in a rotary pendulum movement of the output shaft 6.
  • the Exzenterkoppel consists of a coupling fork 12 which is rotatably connected to the output shaft 6, and an eccentric cam 13 which is rotatably connected to the drive shaft 5, wherein the coupling fork 12 abuts the contour of the eccentric cam 13, so that relative to the axis of rotation 10 of the drive shaft 5 eccentric movement of the eccentric cam 13 can be scanned by the coupling fork 12 and converted into an oscillating pendulum motion about the axis of rotation 11 of the output shaft 6.
  • the eccentric coupling device 8 is adjacent to pivot bearings 14 and 15, respectively, via which the drive shaft 5 and the output shaft 6 are rotatably mounted in the housing 9 on their front side facing the tool 7.
  • the components of the eccentric coupling device 8, that is to say the coupling fork 12 and the eccentric cam 13, are thus adjacent to the end face of the respective shafts facing the tool 7.
  • the coupling fork 12 as part of the Exzenterkoppel drove 8 two forks 12a and 12b, which include the contour of the eccentric cam 13.
  • the section between the fork tines 12a and 12b is expediently part-circular in shape and adapted to the circular shape of the eccentric cam 13, so that an areal contact between the coupling fork 12 and the outer contour of the eccentric cam 13 is given over an angular section.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Sawing (AREA)

Description

Die Erfindung bezieht sich auf eine motorisch angetriebene Werkzeugmaschine mit einer von einer Antriebseinheit angetriebenen Antriebswelle und einer Abtriebswelle, auf der das Werkzeug aufgenommen ist, nach dem Oberbegriff des Anspruches 1. Eine solche Werkzeugmaschine ist der DE 42 03 090 C1 zu entnehmen.The invention relates to a motor-driven machine tool with a drive shaft driven by a drive unit and an output shaft on which the tool is received, according to the preamble of claim 1. Such a machine tool is the DE 42 03 090 C1 refer to.

Stand der TechnikState of the art

In der DE 10 2004 050 798 A1 wird eine Handwerkzeugmaschine mit einer oszillierend antreibbaren Arbeitswelle beschrieben, auf der ein Werkzeug aufgenommen ist, wobei der oszillierende Antrieb zu einer Drehpendelbewegung des Werkzeugs führt, das sowohl zum Schleifen als auch zum Schneiden eingesetzt werden kann. Die Arbeits- bzw. Werkzeugwelle mit dem Werkzeug wird von einem drehfest verbundenen Arm angetrieben, der als Teil einer Exzenterkoppeleinrichtung mit einer Exzenterscheibe zusammenwirkt, die von einem Elektromotor angetrieben wird.In the DE 10 2004 050 798 A1 a hand tool machine is described with an oscillating drivable working shaft, on which a tool is received, wherein the oscillating drive leads to a rotary pendulum motion of the tool, which can be used both for grinding and for cutting. The work or tool shaft with the tool is driven by a non-rotatably connected arm, which cooperates as part of a Exzenterkoppeleinrichtung with an eccentric, which is driven by an electric motor.

Die DE 42 03 890 C1 zeigt ein handgeführtes Schneidgerät mit einem elektrischen Antriebsmotor, dessen Rotorwelle einen Exzenternocken trägt, der mit einem Schwenkhebel mit einer Gabel zusammenwirkt, wobei der Schwenkhebel auf einer Abtriebswelle angeordnet ist, an deren freien Ende ein Werkzeug befestigt ist. Die Drehbewegung der Rotorwelle 11 wird über den Exzenternocken und den Schwenkhebel in eine oszillierende Drehbewegung der Abtriebswelle übertragen. Die Rotorwelle und die Abtriebswelle liegen parallel zueinander.The DE 42 03 890 C1 shows a hand-held cutter with an electric drive motor, the rotor shaft carries an eccentric cam, which cooperates with a pivot lever with a fork, wherein the pivot lever is disposed on an output shaft, at the free end of a tool is attached. The rotational movement of the rotor shaft 11 is transmitted via the eccentric cam and the pivot lever in an oscillating rotational movement of the output shaft. The rotor shaft and the output shaft are parallel to each other.

Der Schwenkhebel befindet sich im Bereich der dem Werkzeug abgewandten Stirnseite auf der Abtriebswelle. Die Abtriebswelle stellt somit die parallel versetzte, axiale Verlängerung der Rotorwelle dar. Insgesamt ergibt sich dadurch ein verhältnismäßig großer Bauraumbedarf in Achsrichtung.The pivot lever is located in the region of the tool facing away from the end face on the output shaft. The output shaft thus represents the parallel offset, axial extension of the rotor shaft. Overall, this results in a relatively large space requirement in the axial direction.

Offenbarung der ErfindungDisclosure of the invention

Von diesem Stand der Technik ausgehend liegt der Erfindung die Aufgabe zugrunde, eine kompakt bauende, motorisch angetriebene Werkzeugmaschine mit pendelnd anzutreibendem Werkzeug anzugeben.Based on this prior art, the invention has for its object to provide a compact, motor-driven machine tool with pendulum to be driven tool.

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 motorisch angetriebene Werkzeugmaschine, bei der es sich insbesondere um eine Handwerkzeugmaschine handelt, deren Werkzeug eine Drehpendelbewegung ausführt, weist parallel zueinander angeordnete Antriebs- und Abtriebswellen auf, wobei zusätzlich vorgesehen ist, dass die Abtriebswelle zumindest teilweise in Höhe der und parallel zur Antriebseinheit verläuft. Auf diese Weise ist sichergestellt, dass sich die Abtriebswelle mit dem Werkzeug unmittelbar neben der Antriebseinheit einschließlich der zur Antriebseinheit gehörenden Antriebswelle befindet, wobei die Werkzeugmaschine aufgrund der axialen Überschneidung von Abtriebswelle und Antriebseinheit in Achsrichtung kurz baut und entsprechend wenig Bauraum beansprucht. Gleiches gilt für die Richtung quer zu den Wellen, da die parallele Anordnung der Abtriebswelle in Querrichtung kaum mehr Platz beansprucht als die Antriebseinheit.The motor-driven machine tool, which is in particular a hand tool whose tool performs a rotary pendulum movement, has parallel to each other arranged input and output shafts, which is additionally provided that the output shaft extends at least partially in height and parallel to the drive unit. In this way, it is ensured that the output shaft with the tool is located directly next to the drive unit including the drive shaft belonging to the drive shaft, the machine tool due to the axial overlap of the output shaft and drive unit in the axial direction builds short and takes up correspondingly little space. The same applies to the direction across the waves, since the parallel arrangement of the output shaft in the transverse direction hardly takes up more space than the drive unit.

Ein weiterer Vorteil der parallelen Anordnung liegt darin, dass die Bewegungsübertragung zwischen Antriebs- und Abtriebswelle aufgrund der parallelen Drehachsen spielfrei oder zumindest mit reduziertem Spiel durchführbar ist. Es ist insbesondere eine linienförmige bzw. flächenförmige Anlage der an der Exzenterkoppeleinrichtung zwischen Antriebs- und Abtriebswelle beteiligten Bauteile aneinander möglich; eine punktförmige Kraftübertragung, die beispielsweise im Stand der Technik bei winklig angeordneten Wellen auftritt und lokal hohe Kraftbelastungen mit der Gefahr erhöhten Spiels aufweist, kann vermieden werden.Another advantage of the parallel arrangement is that the motion transmission between the input and output shaft due to the parallel axes of rotation without play or at least with reduced clearance is feasible. In particular, a linear or planar contact of the components participating in the eccentric coupling device between the input and output shafts is possible with one another; a point-like power transmission, which occurs for example in the prior art at an angle arranged waves and locally high force loads with the risk of increased play can be avoided.

Die Exzenterkoppeleinrichtung umfasst ein Koppelglied und ein Exzenterglied, die jeweils auf unterschiedlichen Wellen angeordnet sind, wobei das Koppelglied bevorzugt auf der Abtriebswelle und das Exzenterglied vorteilhaft auf der Antriebswelle sitzt. Die Drehbewegung des umlaufenden Exzentergliedes wird über das Koppelglied in die Drehpendelbewegung der Abtriebswelle übertragen. Aufgrund der parallelen Anordnung von Antriebs- und Abtriebswelle kann eine linienförmige oder flächige Anlage zwischen Koppelglied und Exzenterglied realisiert werden.The eccentric coupling device comprises a coupling member and an eccentric member, which are each arranged on different shafts, wherein the coupling member preferably on the Output shaft and the eccentric advantageous sitting on the drive shaft. The rotational movement of the revolving eccentric member is transmitted via the coupling member in the rotary pendulum movement of the output shaft. Due to the parallel arrangement of the drive and output shaft, a linear or flat contact between the coupling member and the eccentric member can be realized.

Hierfür ist das Exzenterglied zweckmäßigerweise als Exzenternocken ausgebildet, dessen Kontur von dem Koppelglied abgetastet wird. Das Koppelglied ist beispielsweise gabelförmig ausgeführt, wobei die beiden Gabelzinken das Exzenterglied umgreifen. Die flächige oder linienförmige Anlage zwischen Koppelglied und Exzenterglied erfolgt insbesondere durch teilkreisförmige oder gegebenenfalls auch kreisförmige Ausbildung der aneinanderliegenden Konturen beider Bauteile. Die linienförmige bzw. flächige Anlage erlaubt eine bessere Verteilung der zu übertragenden Kräfte und damit eine geringere punktuelle Belastung.For this purpose, the eccentric member is expediently designed as eccentric cam, whose contour is scanned by the coupling member. The coupling member is designed, for example fork-shaped, wherein the two forks engage around the eccentric member. The planar or linear contact between coupling member and eccentric member is effected in particular by part-circular or possibly also circular formation of the contiguous contours of both components. The linear or planar system allows a better distribution of the forces to be transmitted and thus a lower punctual load.

Gemäß der Erfindung ist das Koppelglied der Koppeleinrichtung benachbart zu dem Werkzeug auf der Abtriebswelle angeordnet. Des Weiteren ist die Antriebseinheit als Elektromotor ausgeführt und der Stator des Elektromotors auf der dem Werkzeug abgewandten Seite im Gehäuse der Werkzeugmaschine angeordnet. Die Positionierung der Koppeleinrichtung auf der dem Werkzeug zugewandten Seite erlaubt eine entsprechend kurze Ausbildung der Abtriebswelle, was dadurch noch unterstützt wird, dass die Antriebswelle sich ebenfalls auf der dem Werkzeug zugewandten Seite befindet und von der Antriebseinheit drehbeaufschlagt wird. In Achsrichtung wird dabei die Bauraumlänge in erster Linie von der Antriebseinheit, also in der Regel von dem Elektromotor bestimmt.According to the invention, the coupling member of the coupling device is arranged adjacent to the tool on the output shaft. Furthermore, the drive unit is designed as an electric motor and the stator of the electric motor is arranged on the side facing away from the tool in the housing of the machine tool. The positioning of the coupling device on the side facing the tool allows a correspondingly short design of the output shaft, which is still supported by the fact that the drive shaft is also located on the side facing the tool and is rotationally urged by the drive unit. In the axial direction, the installation space length is primarily determined by the drive unit, that is, as a rule, by the electric motor.

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

Fig. 1
einen Schnitt durch eine Handwerkzeugmaschine, deren Werkzeug eine oszillierende Pendelschwingung zum Sägen und/oder Schleifen ausübt, wobei das Werkzeug an einer Abtriebswelle gehalten ist, die parallel zu einer elektromotorisch angetriebenen Antriebswelle steht,
Fig. 2
die Handwerkzeugmaschine in einer perspektivischen Darstellung,
Fig. 3
die Exzenterkoppeleinrichtung in Einzeldarstellung, über die die Drehbewegung der elektromotorisch angetriebenen Antriebswelle in die Drehpendelbewegung der das Werkzeug tragenden Abtriebswelle umgesetzt wird.
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 a hand tool whose tool exerts an oscillating pendulum oscillation for sawing and / or grinding, wherein the tool is held on an output shaft which is parallel to an electric motor driven drive shaft,
Fig. 2
the hand tool in a perspective view,
Fig. 3
the eccentric coupling device in a single representation, via which the rotational movement of the electric motor-driven drive shaft is converted into the rotary pendulum movement of the tool-carrying output shaft.

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 weist in einem Gehäuse 9 einen elektrischen Antriebsmotor 2 auf, bestehend aus einem gehäusefesten Stator 3 und einem Anker bzw. Rotor 4, an dem drehfest und koaxial eine Antriebswelle 5 angeordnet ist. Die Drehbewegung der Antriebwelle 5 wird über eine Exzenterkoppeleinrichtung 8 auf eine Abtriebswelle 6 übertragen, die ein Werkzeug 7 trägt. Mittels der Exzenterkoppeleinrichtung 8 wird die rotierende Bewegung der Antriebswelle 5 in eine Drehpendelbewegung der Abtriebswelle 6 übertragen.In the Fig. 1 shown hand tool 1 comprises in a housing 9 an electric drive motor 2, consisting of a housing-fixed stator 3 and an armature or rotor 4, on the rotatably and coaxially a drive shaft 5 is arranged. The rotational movement of the drive shaft 5 is transmitted via an eccentric coupling 8 to an output shaft 6, which carries a tool 7. By means of the eccentric coupling 8, the rotary movement of the drive shaft 5 is transmitted in a rotary pendulum movement of the output shaft 6.

Antriebswelle 5 und Abtriebswelle 6 und damit auch die jeweiligen Drehachsen 10 bzw. 11 liegen parallel zueinander im Gehäuse 9. Um eine in Achsrichtung kurz bauende Vorrichtung zu erhalten, erstreckt sich die Abtriebswelle 6 in Achsrichtung gesehen bis in Höhe des Stators 3 des elektrischen Antriebsmotors 2. Man erhält dadurch in Achsrichtung eine teilweise Überdeckung von Abtriebswelle 6 und Stator 3. Die das Werkzeug 7 tragende Stirnseite der Abtriebswelle 6 ragt geringfügig axial aus dem Gehäuse 9 hervor. Die Abtriebswelle 6 überdeckt sich in Achsrichtung gesehen etwa zur Hälfte ihrer Länge mit dem Stator 3.Drive shaft 5 and output shaft 6 and thus also the respective axes of rotation 10 and 11 are parallel to each other in the housing 9. To obtain a short in the axial direction device, the output shaft 6 extends in the axial direction This results in the axial direction, a partial overlap of the output shaft 6 and stator 3. The tool 7 bearing end side of the output shaft 6 protrudes slightly axially from the housing 9. The output shaft 6 overlaps in the axial direction approximately half of its length with the stator. 3

Die Exzenterkoppeleinrichtung besteht aus einer Koppelgabel 12, die drehfest mit der Abtriebswelle 6 verbunden ist, und einem Exzenternocken 13, der drehfest mit der Antriebswelle 5 verbunden ist, wobei die Koppelgabel 12 an der Kontur des Exzenternockens 13 anliegt, so dass die bezogen auf die Drehachse 10 der Antriebswelle 5 exzentrischen Bewegung des Exzenternockens 13 von der Koppelgabel 12 abgetastet und in eine oszillierende Pendelbewegung um die Drehachse 11 der Abtriebswelle 6 umgesetzt werden kann. Die Exzenterkoppeleinrichtung 8 liegt benachbart zu Drehlagern 14 bzw. 15, über die die Antriebswelle 5 bzw. die Abtriebswelle 6 an ihrer dem Werkzeug 7 zugewandten Stirnseite drehbar im Gehäuse 9 gelagert sind. Die Bauteile der Exzenterkoppeleinrichtung 8, also die Koppelgabel 12 und der Exzenternocken 13, befinden sich somit benachbart zu der dem Werkzeug 7 zugewandten Stirnseite der jeweiligen Wellen.The Exzenterkoppeleinrichtung consists of a coupling fork 12 which is rotatably connected to the output shaft 6, and an eccentric cam 13 which is rotatably connected to the drive shaft 5, wherein the coupling fork 12 abuts the contour of the eccentric cam 13, so that relative to the axis of rotation 10 of the drive shaft 5 eccentric movement of the eccentric cam 13 can be scanned by the coupling fork 12 and converted into an oscillating pendulum motion about the axis of rotation 11 of the output shaft 6. The eccentric coupling device 8 is adjacent to pivot bearings 14 and 15, respectively, via which the drive shaft 5 and the output shaft 6 are rotatably mounted in the housing 9 on their front side facing the tool 7. The components of the eccentric coupling device 8, that is to say the coupling fork 12 and the eccentric cam 13, are thus adjacent to the end face of the respective shafts facing the tool 7.

Wie Fig. 2 und insbesondere Fig. 3 zu entnehmen, weist die Koppelgabel 12 als Bestandteil der Exzenterkoppeleinrichtung 8 zwei Gabelzinken 12a und 12b auf, die die Kontur des Exzenternockens 13 umfassen. Der Abschnitt zwischen den Gabelzinken 12a und 12b ist zweckmäßig teilkreisförmig ausgebildet und an die Kreisform des Exzenternockens 13 angepasst, so dass über einen Winkelabschnitt eine flächige Anlage zwischen der Koppelgabel 12 und der Außenkontur des Exzenternockens 13 gegeben ist.As Fig. 2 and particularly Fig. 3 can be seen, the coupling fork 12 as part of the Exzenterkoppeleinrichtung 8 two forks 12a and 12b, which include the contour of the eccentric cam 13. The section between the fork tines 12a and 12b is expediently part-circular in shape and adapted to the circular shape of the eccentric cam 13, so that an areal contact between the coupling fork 12 and the outer contour of the eccentric cam 13 is given over an angular section.

Claims (4)

  1. Motor-driven machine tool, in particular hand-operating machine tool (1) having a tool (7) to be driven rotatably, with a driveshaft (5) driven by a drive unit (2) and with an output shaft (6) on which the tool (7) is held, the rotational movement of the driveshaft (5) being convertible via an eccentric coupling device (8) into an oscillating movement of the output shaft (6), the eccentric coupling device (8) comprising a coupling member (12) and an eccentric member (13) which is seated on one of the shafts (5, 6), and the coupling member (12) being operatively connected to the eccentric member (13), the driveshaft and output shaft (5, 6) being arranged parallel to one another, and the output shaft (6) running at least partially level with and parallel to the drive unit (2), the drive unit (2) being assigned as an electric motor, and the stator (3) of the electric motor (2) being arranged, on the side facing away from the tool (7), in the housing (9) of the machine tool (1), characterized in that the coupling member (12) of the eccentric coupling device (8) is arranged adjacently to the tool (7) on the output shaft (6), and in that, as seen in the axial direction, the output shaft (6) is overlapped over about half of its length by the stator (3).
  2. Machine tool according to Claim 1, characterized in that the eccentric member is designed as an eccentric cam (13) connected fixedly to the driveshaft (5), and in that the coupling member (12) bears against the contour of the eccentric cam (13).
  3. Machine tool according to Claim 1 or 2, characterized in that the coupling member (12) is of fork-shaped design, the fork prongs (12a, 12b) surrounding the eccentric member (13).
  4. Machine tool according to Claim 2 or 3, characterized in that the eccentric cam (13) and that portion of the coupling member (12) which bears against the eccentric cam have in each case an at least half-circular contour and bear one against the other at least approximately linearly or areally.
EP08716952.0A 2007-04-19 2008-02-19 Motor-driven machine tool Not-in-force EP2139654B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007018465A DE102007018465A1 (en) 2007-04-19 2007-04-19 Motor driven machine tool
PCT/EP2008/052011 WO2008128802A1 (en) 2007-04-19 2008-02-19 Motor-driven machine tool

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EP2139654A1 EP2139654A1 (en) 2010-01-06
EP2139654B1 true EP2139654B1 (en) 2014-04-09

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US (1) US8096856B2 (en)
EP (1) EP2139654B1 (en)
CN (1) CN101663140B (en)
DE (1) DE102007018465A1 (en)
WO (1) WO2008128802A1 (en)

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US20100003906A1 (en) 2010-01-07
WO2008128802A1 (en) 2008-10-30
US8096856B2 (en) 2012-01-17
EP2139654A1 (en) 2010-01-06
CN101663140A (en) 2010-03-03
CN101663140B (en) 2012-11-28
DE102007018465A1 (en) 2008-10-23

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