EP2314419B1 - Motor-driven tool device - Google Patents

Motor-driven tool device Download PDF

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Publication number
EP2314419B1
EP2314419B1 EP20100187470 EP10187470A EP2314419B1 EP 2314419 B1 EP2314419 B1 EP 2314419B1 EP 20100187470 EP20100187470 EP 20100187470 EP 10187470 A EP10187470 A EP 10187470A EP 2314419 B1 EP2314419 B1 EP 2314419B1
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EP
European Patent Office
Prior art keywords
sliding block
machine housing
tool device
component
toothing system
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EP20100187470
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German (de)
French (fr)
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EP2314419A1 (en
Inventor
Michael Kukla
Jan-Simon Blind
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Publication of EP2314419A1 publication Critical patent/EP2314419A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0046—Preventing rotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details

Definitions

  • the invention relates to a motor-driven power tool with hammer drill mode and chisel mode according to the preamble of claim 1, comprising a drive train, a drill sleeve and a hammer mill comprehensive power train and an adjusting unit for adjusting the hammer drill mode or the chisel mode, wherein the adjusting unit comprises a sliding block, which has a Internal toothing on an external toothing of the drill sleeve in the longitudinal direction of the drill sleeve is displaceable.
  • a tool device is from the EP-A-1 661 667 known.
  • the sliding block is in the bit mode with its internal teeth in engagement with a rotatable with the machine housing component and so makes the drill sleeve is not rotatable.
  • the non-rotatable with the machine housing component is formed by a retaining ring having a portion with a complementary to the internal teeth of the sliding block outer teeth, which engages the internal teeth of the sliding block in the bit mode. This is an involute toothing both in the internal toothing and in the external toothing.
  • This component in turn is formed so complementary to the internal toothing of the sliding block, that in the bit mode just the aforementioned rotationally fixed coupling between the sliding block and the said component and thus also between the sliding block and the drill sleeve is realized.
  • the sliding block is indeed rotatably connected to the drill sleeve on its internal teeth.
  • the mentioned with the machine housing rotatable component may be formed in an advantageous manner by a plastic part, which is claimed only for rotationally fixed fixation of the sliding block by positive locking.
  • the component rotatable with the machine housing is limitedly displaceable in the axial direction and is spring-biased toward an end position and thus limitedly deflectable against the spring preload by the sliding block, in order subsequently to rotate slightly in the sliding block Engagement position with the internal teeth of the sliding block to step.
  • This embodiment has the advantage that the sliding block can be brought in any rotational position of the drill sleeve without significant resistance in its chisel mode defining axial position in which he sets the drill sleeve rotation. If, in fact, the internal toothing in the axial direction is not exactly aligned with a contour of the component that is rotationally fixed to the machine housing, then the component is deflected axially against its spring preload. Then, then, the tool or the drill sleeve manually or twisted slightly in the course of operation of the power tool, the two parts snap into their non-rotatable coupling position.
  • the rotatable with the machine housing component and a spring bias causing spring are preferably designed and arranged such that they surround the drill sleeve circumferentially.
  • the rotatable component with the machine housing radially outwardly of the sliding block has a stop means which defines its axial end position in the direction of the sliding block.
  • This stop means is suitably against an axial support, which is preferably formed in the machine housing.
  • the component 34 which is non-rotatable with the machine housing is additionally displaceable in the axial direction in a limited manner. It is under spring bias by a spring 44, on the one hand is supported against an axial step 46 and the other end against an end face 48 of the retaining ring 38. This ensures that the internal toothing 30 of the sliding block 16 can easily reach the external toothing 40 of the retaining ring 38 in the engaged position. In not exactly aligned rotational position of the sliding block 16 can slightly deflect the retaining ring 38 in the axial direction, so that due to the spring preload by subsequent slight rotation of the sliding block and the drill sleeve in FIG. 4 shown engagement position is taken automatically.

Description

Die Erfindung betrifft ein motorisch angetriebenes Werkzeuggerät mit Bohrhammerbetriebsart und Meißelbetriebsart gemäß Oberbegriff des Anspruchs 1, mit einem Antriebsstrang, einem eine Bohrhülse und ein Hammerwerk umfassenden Abtriebsstrang und einer Verstelleinheit zum Einstellen der Bohrhammerbetriebsart oder der Meißelbetriebsart, wobei die Verstelleinheit einen Schiebeblock umfasst, der über eine Innenverzahnung auf einer Außenverzahnung der Bohrhülse in Längsrichtung der Bohrhülse verschieblich ist. Ein solches Werkzeuggerät ist aus der EP-A-1 661 667 bekannt. Es kann sich hierbei also beispielsweise um einen typischen Bohrhammer handeln, bei dem das Werkzeug sowohl rotierend antreibbar ist als auch dabei eine in axialer Richtung hin und her gehende Stoßbeaufschlagung erfährt, die über einen hin und her gehenden sogenannten Schläger innerhalb des Hammerwerks auf das Werkzeug ausgeübt wird. Daneben ist bei derartigen Werkzeuggeräten typischerweise eine Umschaltbarkeit auf reinen Bohrbetrieb und/oder auf reinen Hammer- oder Meißelbetrieb, also ohne rotierenden Antrieb des Werkzeugs möglich. Wenn über die Verstelleinheit von der Bohrhammerbetriebsart auf die Meißelbetriebsart, also Hammerfunktion ohne drehenden Antrieb der Bohrhülse, umgeschaltet wird, so muss zumindest für den Einsatz nicht rotationssymmetrischer Meißelwerkzeuge, z. B. Flachmeißel, eine Arretierfunktion vorgesehen werden, die das Drehen der Bohrhülse und des Werkzeugs um ihre Längsachse verhindert. Hierfür sind zahlreiche Lösungen bekannt geworden, wobei entweder im Antriebsstrang oder im Abtriebsstrang ein zusätzlich vorgesehenes Element in eine gehäusefeste Ausnehmung eingreift, eine gehäusefeste Ausnehmung eingreift. Dies ist jedoch aufwändig und kostenintensiv und bringt zusätzlich Anforderungen hinsichtlich der Koaxialität der miteinander zu verschweißenden Bauteile mit sich.The invention relates to a motor-driven power tool with hammer drill mode and chisel mode according to the preamble of claim 1, comprising a drive train, a drill sleeve and a hammer mill comprehensive power train and an adjusting unit for adjusting the hammer drill mode or the chisel mode, wherein the adjusting unit comprises a sliding block, which has a Internal toothing on an external toothing of the drill sleeve in the longitudinal direction of the drill sleeve is displaceable. Such a tool device is from the EP-A-1 661 667 known. Thus, this may be, for example, a typical hammer drill in which the tool is both driven to rotate and thereby experiences a shocking in the axial direction going back and forth exerted via a reciprocating so-called bat within the hammer mill on the tool becomes. In addition, in such a tool devices typically a switchover to pure drilling operation and / or pure hammer or chisel operation, ie without rotating drive of the tool possible. If the adjusting unit is switched over from the hammer drill mode to the bit mode, ie hammer function without rotating drive of the drill sleeve, at least for the use of non-rotationally symmetrical bit tools, eg. As flat chisel, a locking function are provided which prevents the rotation of the drill sleeve and the tool about its longitudinal axis. Numerous solutions have become known for this purpose, wherein an additionally provided element engages in a housing-fixed recess either in the drive train or in the drive train, engages a housing-fixed recess. However, this is costly and expensive and brings additional requirements for the coaxiality of the components to be welded together with it.

Aus der US 2007/0074883 A1 ist ebenfalls ein motorisch angetriebenes Werkzeuggerät mit einem sich drehenden Hammer bekannt, wobei dieser in unterschiedlichen Betriebsarten betrieben werden kann. Hierzu ist eine Umschaltvorrichtung vorgesehen, die ein Kopplungselement umfasst, welches eine Schiebehülse mit einer Innenverzahnung umfasst, die relativ zu einem angetriebenen Zahnrad der Werkzeugmaschine bzw. ihrem Gehäuse verschiebbar ist. Zwischen dem Gehäuse und dem angetriebenen Zahnrad befindet sich ein weiteres Zahnrad mit einer Außenverzahnung, welches nicht drehbar an der Antriebshülse des Werkzeuggeräts angebracht ist. Das Gehäuse und das angetriebene Zahnrad weisen wie auch das dazwischen angeordnete Zahnrad eine Außenverzahnung auf, die mit der Innenverzahnung der Schiebehülse übereinstimmt, so dass diese durch Verschiebung in oder außer Eingriff mit den jeweiligen außenverzahnten Elementen gebracht werden kann.From the US 2007/0074883 A1 is also a motor-driven tool unit with a rotating hammer known, which can be operated in different modes. For this purpose, a switching device is provided, which comprises a coupling element, which comprises a sliding sleeve with an internal toothing, which is displaceable relative to a driven gear of the machine tool or its housing. Between the housing and the driven gear is another gear with external teeth, which is non-rotatably mounted on the drive sleeve of the power tool. The housing and the driven gear, as well as the interposed gear on an outer toothing, which coincides with the internal toothing of the sliding sleeve, so that it can be brought by displacement in or out of engagement with the respective externally toothed elements.

Aus der DE 197 24 531 A1 ist ferner ein Bohrhammer bekannt, bei dem mit Hilfe einer Mehrfunktionshülse, welche eine Arretierverzahnung zur drehfesten Festlegung des Führungsrohrs des Bohrhammers trägt, eine Lagerstelle zur Lagerung des Führungsrohrs gebildet wird.From the DE 197 24 531 A1 Furthermore, a hammer drill is known in which by means of a multi-functional sleeve, which carries a locking toothing for the rotationally fixed fixing of the guide tube of the hammer drill, a bearing point for supporting the guide tube is formed.

Schließlich ist aus der EP 1 661 667 A1 ein Bohrhammer bekannt, der einen Schalter zum Aktivieren oder Deaktivieren des Drehantriebs aufweist, wobei ein Schaltring ebenfalls mit seiner Außenverzahnung in Eingriff mit einem gehäusefesten Bauteil gebracht werden kann.Finally, out of the EP 1 661 667 A1 a rotary hammer is known, which has a switch for activating or deactivating the rotary drive, wherein a switching ring also with its external teeth in Intervention can be brought with a housing-fixed component.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Werkzeuggerät der vorstehend genannten Art dahingehend zu verbessern, dass die vorausgehend geschilderte Arretierungsfunktion auf möglichst einfache und wirtschaftliche Weise realisiert werden kann.The present invention has for its object to improve a tool device of the type mentioned above to the effect that the previously described locking function can be realized in the simplest and most economical manner.

Diese Aufgabe wird bei einem Werkzeuggerät der genannten Art erfindungsgemäß dadurch gelöst, dass der Schiebeblock in der Meißelbetriebsart mit seiner Innenverzahnung in Eingriff mit einem mit dem Maschinengehäuse drehfesten Bauteil steht und so die Bohrhülse unverdrehbar stellt. Zudem ist das mit dem Maschinengehäuse drehfeste Bauteil von einem Haltering gebildet, der einen Abschnitt mit einer zur Innenverzahnung des Schiebeblocks komplementären Außenverzahnung aufweist, in die die Innenverzahnung des Schiebeblocks in der Meißelbetriebsart eingreift. Hierbei handelt es sich sowohl bei der Innenverzahnung als auch bei der Außenverzahnung um eine Evolventenverzahnung.This object is achieved in a tool device of the type mentioned in the present invention that the sliding block is in the bit mode with its internal teeth in engagement with a rotatable with the machine housing component and so makes the drill sleeve is not rotatable. In addition, the non-rotatable with the machine housing component is formed by a retaining ring having a portion with a complementary to the internal teeth of the sliding block outer teeth, which engages the internal teeth of the sliding block in the bit mode. This is an involute toothing both in the internal toothing and in the external toothing.

Es wird also erfindungsgemäß vorgeschlagen, auf zusätzliche in formschlüssig und drehbegrenzender Weise wirkende Bauteile zu verzichten und stattdessen die ohnehin vorhandene Innenverzahnung des auf der Bohrhülse längsverschieblichen Schiebeblocks zugleich für den vorstehenden Zweck zu verwenden, nämlich die Bohrspindel in der Meißelbetriebsart drehfest zu stellen. Dies bedeutet, dass weniger Teile und Werkzeuge für diese Teile hergestellt werden müssen und dass auf den vorausgehend geschilderten arbeits- und kostenintensiven Fügeprozess, der wiederum Qualitätsprobleme mit sich bringen kann, verzichtet wird. Das erwähnte mit dem Maschinengehäuse drehfeste Bauteil kann entweder von dem Maschinengehäuse selbst gebildet sein, also mit diesem einstückig sein, oder es kann von einem zusätzlichen drehfest zum Maschinengehäuse angeordneten Bauteil gebildet sein. Dieses Bauteil wiederum ist derart komplementär zu der Innenverzahnung des Schiebeblocks ausgebildet, dass in der Meißelbetriebsart eben die vorerwähnte drehfeste Kopplung zwischen Schiebeblock und dem genannten Bauteil und damit auch zwischen Schiebeblock und der Bohrhülse realisiert ist. Der Schiebeblock ist ja mit der Bohrhülse über seine Innenverzahnung drehfest verbunden.It is therefore proposed according to the invention to dispense with additional acting in positive and drehbegrenzender manner components and instead to use the already existing internal toothing of the longitudinally displaceable sliding sleeve sliding block at the same time for the above purpose, namely to provide the drill spindle in the chisel mode rotation. This means that fewer parts and tools for these parts must be produced and that is on the previously described labor-intensive and costly joining process, which in turn can bring quality problems. This mentioned with the machine housing rotatable component can either be formed by the machine housing itself, so be integral with this, or it can be formed by an additional rotationally fixed to the machine housing component. This component in turn is formed so complementary to the internal toothing of the sliding block, that in the bit mode just the aforementioned rotationally fixed coupling between the sliding block and the said component and thus also between the sliding block and the drill sleeve is realized. The sliding block is indeed rotatably connected to the drill sleeve on its internal teeth.

Das erwähnte mit dem Maschinengehäuse drehfeste Bauteil kann in vorteilhafter Weise von einem Kunststoffteil gebildet sein, das lediglich zur drehfesten Fixierung des Schiebeblocks durch Formschluss beansprucht wird.The mentioned with the machine housing rotatable component may be formed in an advantageous manner by a plastic part, which is claimed only for rotationally fixed fixation of the sliding block by positive locking.

Als besonders vorteilhaft erweist es sich, wenn das mit dem Maschinengehäuse drehfeste Bauteil in axialer Richtung begrenzt verschieblich ist und in Richtung auf eine Endlage unter Federvorspannung steht und so entgegen der Federvorspannung durch den Schiebeblock begrenzt auslenkbar ist, um anschließend bei geringfügiger Verdrehung des Schiebeblocks in die Eingriffstellung mit der Innenverzahnung des Schiebeblocks zu treten. Diese Ausführungsform hat den Vorteil, dass der Schiebeblock in jeder Drehstellung der Bohrhülse ohne nennenswerten Widerstand in seine die Meißelbetriebsart bestimmende axiale Stellung gebracht werden kann, in der er gleichzeitig die Bohrhülse drehfest setzt. Sollte nämlich die Innenverzahnung in axialer Richtung nicht exakt mit einer Kontur des mit dem Maschinengehäuse drehfesten Bauteils fluchten, so wird das Bauteil entgegen seiner Federvorspannung axial ausgelenkt. Wenn dann anschließend das Werkzeug oder die Bohrhülse manuell oder im Zuge des Betriebs des Werkzeuggeräts geringfügigst verdreht, so rasten die beiden Teile in ihre drehfeste Kopplungsstellung.It proves to be particularly advantageous if the component rotatable with the machine housing is limitedly displaceable in the axial direction and is spring-biased toward an end position and thus limitedly deflectable against the spring preload by the sliding block, in order subsequently to rotate slightly in the sliding block Engagement position with the internal teeth of the sliding block to step. This embodiment has the advantage that the sliding block can be brought in any rotational position of the drill sleeve without significant resistance in its chisel mode defining axial position in which he sets the drill sleeve rotation. If, in fact, the internal toothing in the axial direction is not exactly aligned with a contour of the component that is rotationally fixed to the machine housing, then the component is deflected axially against its spring preload. Then, then, the tool or the drill sleeve manually or twisted slightly in the course of operation of the power tool, the two parts snap into their non-rotatable coupling position.

Das mit dem Maschinengehäuse drehfeste Bauteil und eine die Federvorspannung bewirkende Feder sind vorzugsweise derart ausgebildet und angeordnet, dass sie die Bohrhülse umfangsseitig umgeben.The rotatable with the machine housing component and a spring bias causing spring are preferably designed and arranged such that they surround the drill sleeve circumferentially.

Dabei ist es zweckmäßig, wenn die Feder einerseits gegen eine axiale Stufe und andererseits gegen eine vom Schiebeblock abgewandte Stirnseite des mit dem Maschinengehäuse drehfesten Bauteils abgestützt ist.It is expedient if the spring is supported on the one hand against an axial step and on the other hand against a side facing away from the sliding block end face of the rotatable with the machine housing component.

Weiter erweist es sich als vorteilhaft, wenn das mit dem Maschinengehäuse drehfeste Bauteil radial außerhalb des Schiebeblocks ein Anschlagmittel aufweist, welches seine axiale Endlage in Richtung auf den Schiebeblock definiert. Dieses Anschlagmittel liegt zweckmäßigerweise gegen ein axiales Auflager an, welches vorzugsweise in dem Maschinengehäuse ausgebildet ist.Further, it proves to be advantageous if the rotatable component with the machine housing radially outwardly of the sliding block has a stop means which defines its axial end position in the direction of the sliding block. This stop means is suitably against an axial support, which is preferably formed in the machine housing.

Zur Kopplung des Bauteils mit dem Maschinengehäuse erweist es sich als vorteilhaft, wenn das Bauteil über wenigstens einen, vorzugsweise über mehrere nach radial außen vorstehende Vorsprünge drehfest mit Komponenten des Maschinengehäuses gekoppelt ist.For coupling the component to the machine housing, it proves to be advantageous if the component via at least one, preferably over a plurality of radially outwardly projecting projections rotatably coupled to components of the machine housing.

Nach einer weiteren besonders bevorzugten Ausführungsform der Erfindung bildet die Verstelleinheit zum Einstellen der Bohrhammerbetriebsart oder der Meißelbetriebsart zugleich zwei Getriebestufen für den Drehantrieb der Bohrhülse.According to a further particularly preferred embodiment of the invention, the adjusting unit for setting the hammer drill operating mode or the bit operating mode simultaneously forms two gear stages for the rotary drive of the drill sleeve.

Hierfür erweist es sich als vorteilhaft, wenn der Schiebeblock eine Außenverzahnung aufweist, mit der in einer ersten Getriebestufe eine Ritzelwelle des Antriebsstrang in kämmender Antriebsverbindung steht. Auf diese Weise wird eine rotierende Bewegung der Ritzelwelle über den Antriebsstrang auf den Schiebeblock und damit auf die Bohrhülse übertragen.For this purpose, it proves to be advantageous if the sliding block has an external toothing, with which in a first gear stage, a pinion shaft of the drive train is in meshing drive connection. In this way, a rotary movement of the pinion shaft is transmitted via the drive train to the sliding block and thus to the drill sleeve.

In weiterer Ausbildung dieses Gedankens wird eine zweite Getriebestufe dadurch realisiert, dass ein Antriebsrad des Antriebsstrangs mit der Außenverzahnung der Bohrhülse in kämmender Antriebsverbindung steht. In dieser Betriebsart befindet sich der Schiebeblock ungefähr in der Mitte zwischen seiner axialen Verschiebestellung in der Meißelbetriebsart und seiner axialen Verschiebestellung in der Bohrhammerbetriebsart, die typischerweise nur in der ersten Getriebestufe ausgeführt wird.In a further development of this concept, a second gear stage is realized in that a drive wheel of the drive train is in meshing drive connection with the outer toothing of the drill sleeve. In this mode of operation, the sliding block is approximately midway between its axial displacement position in the bit mode and its axial displacement position in the hammer drill mode, which is typically performed only in the first gear stage.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Patentansprüchen und aus der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform der Erfindung. In der Zeichnung zeigt:

Fig. 1 und 2
perspektivische Ansichten der Verstelleinheit mit Schiebeblock in der Bohrhammerbetriebsart und in der Meißelbetriebsart bei teilweise aufgerissenem Werkzeuggerät; und
Fig. 3 und 4
teilweise Schnittansichten, die Längsmittelachse des Abtriebsstrangs des erfindungsgemäßen Werkzeuggeräts nach Figuren 1 und 2 einschließend, in der Bohrhammerbetriebsart bzw. in der Meißelbetriebsart.
Further features, details and advantages of the invention will become apparent from the appended claims and from the drawings and the following description of a preferred embodiment of the invention. In the drawing shows:
Fig. 1 and 2
perspective views of the adjustment unit with sliding block in the hammer drill mode and in chisel mode with partially torn tool; and
3 and 4
Partial sectional views, the longitudinal center axis of the output line of the power tool according to the invention according to Figures 1 and 2 including, in the hammer drill mode and in the bit mode.

Figuren 3 und 4 zeigen das Innere eines motorisch angetriebenes Werkzeuggeräts in Form eines typischen Bohrhammers mit wahlweise einstellbarer Bohrhammerbetriebsart, Bohrbetriebsart und Meißelbetriebsart. Dargestellt ist ein Teil eines Antriebsstrangs 2 in Form einer Zwischenwelle 4 und die Komponenten eines Abtriebsstrangs 6, umfassend ein insgesamt mit dem Bezugszeichen 8 bezeichnetes Hammerwerk und eine Bohrhülse 10 sowie ein in eine Werkzeugaufnahme 12 einsetzbares Werkzeug 14, beispielsweise ein Bohrmeißel oder Flachmeißel. FIGS. 3 and 4 show the interior of a power tool in the form of a typical hammer drill with optional adjustable hammer mode, Bohrbetriebsart and chisel mode. Shown is a part of a drive train 2 in the form of an intermediate shaft 4 and the components of a power take-off 6, comprising a generally designated by the reference numeral 8 hammer mechanism and a drill sleeve 10 and a usable in a tool holder 12 tool 14, such as a drill bit or flat chisel.

Die beispielsweise von einer nicht dargestellten Motorritzelwelle angetriebene Zwischenwelle 4 steht in der beispielhaft dargestellten Betriebsart in Antriebsverbindung mit der Bohrhülse 10, indem sie mit einem auf der Bohrhülse 10 drehfest sitzenden Stirnrad 16 kämmt. Die Bohrhülse 10 ist einstückig oder zumindest drehfest verbunden mit der Werkzeugaufnahme 12 ausgebildet. Ferner treibt die Zwischenwelle 4 über eine nicht dargestellte Taumelscheibenanordnung eine Druckhülse 18 in axialer Richtung 20 hin und her gehend an. Die Druckhülse 18 begrenzt in ihrem Inneren ein Druckluftpolster 22 zwischen sich und einem Schläger 24 des Hammerwerks 8. Ungeachtet des rotierenden Antriebs der Bohrhülse 10, der sich auf das Werkzeug 14 überträgt, wird durch den hin und her gehenden Antrieb der Druckhülse 18 eine hin und her gehende schlagende Hammerbewegung des Schlägers 24 erzeugt, die über die werkzeugzugewandte Stirnseite 26 des Schlägers 24 auf die nach innen gewandte Stirnseite des Werkzeugs 14 übertragen wird.The example driven by a motor pinion shaft not shown intermediate shaft 4 is in the mode of operation shown by way of example in drive connection with the drill sleeve 10 by meshing with a rotatably seated on the drill sleeve 10 spur gear 16. The drill sleeve 10 is integrally formed or at least rotatably connected to the tool holder 12. Furthermore drives the intermediate shaft 4 via a swash plate assembly, not shown, a pressure sleeve 18 in the axial direction 20 back and forth. The pressure sleeve 18 defines in its interior a compressed air cushion 22 between itself and a racket 24 of the hammer mechanism 8. Regardless of the rotating drive of the drill sleeve 10, which transmits to the tool 14, by the reciprocating drive of the pressure sleeve 18 is a down and originating striking hammer movement of the racket 24 generated, which is transmitted via the tool-facing end face 26 of the racket 24 on the inwardly facing end face of the tool 14.

Wie sich am besten den Figuren 3 und 4 entnehmen lässt, umfasst die Bohrhülse 10 eine Außenverzahnung 28, die mit einer Innenverzahnung 30 des Antriebsrads 16 drehfest gekoppelt ist. Das Antriebsrad 16 bildet einen Schiebeblock 32, der in axialer Richtung 20 auf der Bohrhülse 10 verschieblich ist und drehfest mit der Bohrhülse gekoppelt ist.How best the FIGS. 3 and 4 can be removed, the drill sleeve 10 includes an outer toothing 28 which is rotatably coupled to an internal toothing 30 of the drive wheel 16. The drive wheel 16 forms a sliding block 32 which is displaceable in the axial direction 20 on the drill sleeve 10 and rotatably coupled to the drill sleeve.

Ferner ist ein mit einem Maschinengehäuse 33 drehfestes Bauteil 34 vorgesehen, welches die Bohrhülse 10 in Umfangsrichtung umgibt. Dieses Bauteil 34 weist in axialer Richtung und in radialer Richtung öffnende Vertiefungen 36 auf, in welche die Innenverzahnung 30 des Schiebeblocks 32 eingreift, wenn der Schiebeblock 16 in axialer Richtung 20 in die in Figur 4 dargestellte axiale Verschiebestellung für die Meißelbetriebsart verschoben wird. Das Bauteil 34 ist im beispielhaft dargestellten Fall als Haltering 38 ausgebildet und die Vertiefungen 36 sind von einer Außenverzahnung 40 bei diesem Haltering 38 gebildet, die komplementär zur Innenverzahnung 30 des Schiebeblocks 32 ausgebildet ist. Wenn der Schiebeblock 32 ausgehend von der Bohrhammerbetriebsart gemäß Figur 3 in die in Figur 4 dargestellte Meißelbetriebsart in axialer Richtung 20 in Richtung auf den Haltering 38 verschoben wird, so gelangt die Außenzahnung des Stirnrads 16 außer Eingriff mit einer Zahnung 42 bei der Zwischenwelle 4, so dass die Bohrhülse 10 nicht mehr drehangetrieben ist. Sie wird zudem durch Kopplung des Halterings 38 mit dem Schiebeblock 16 drehfest gegenüber dem Maschinengehäuse 33 arretiert.Further, a rotatably with a machine housing 33 component 34 is provided which surrounds the drill sleeve 10 in the circumferential direction. This component 34 has depressions 36 which open in the axial direction and in the radial direction and into which the internal toothing 30 of the sliding block 32 engages when the sliding block 16 moves in the axial direction 20 into the inward-facing grooves FIG. 4 shown axial displacement position for the bit mode is shifted. The component 34 is formed in the example shown as a retaining ring 38 and the recesses 36 are formed by an external toothing 40 in this retaining ring 38, which is complementary to the internal toothing 30 of the sliding block 32. When the sliding block 32, starting from the hammer drill mode according to FIG. 3 in the in FIG. 4 illustrated chisel mode is moved in the axial direction 20 in the direction of the retaining ring 38, the outer toothing of the spur gear 16 comes out of engagement with a toothing 42 in the intermediate shaft 4, so that the drill sleeve 10 is no longer rotationally driven. It is also locked in rotation with respect to the machine housing 33 by coupling the retaining ring 38 with the sliding block 16.

Des Weiteren ist das mit dem Maschinengehäuse drehfeste Bauteil 34 in Form des Halterings 38 zusätzlich in axialer Richtung begrenzt verschieblich. Es steht unter Federvorspannung durch eine Feder 44, die sich einerseits gegen eine axiale Stufe 46 und anderenends gegen eine Stirnseite 48 des Halterings 38 abstützt. Dadurch ist gewährleistet, dass die Innenverzahnung 30 des Schiebeblocks 16 ohne weiteres mit der Außenverzahnung 40 des Halterings 38 in Eingriffsstellung gelangen kann. Bei nicht exakt fluchtender Drehstellung vermag der Schiebeblock 16 den Haltering 38 in axialer Richtung geringfügig auszulenken, so dass infolge der Federvorspannung durch anschließendes geringfügiges Verdrehen des Schiebeblocks und der Bohrhülse die in Figur 4 dargestellte Eingriffsstellung selbsttätig eingenommen wird.Furthermore, in the form of the retaining ring 38, the component 34 which is non-rotatable with the machine housing is additionally displaceable in the axial direction in a limited manner. It is under spring bias by a spring 44, on the one hand is supported against an axial step 46 and the other end against an end face 48 of the retaining ring 38. This ensures that the internal toothing 30 of the sliding block 16 can easily reach the external toothing 40 of the retaining ring 38 in the engaged position. In not exactly aligned rotational position of the sliding block 16 can slightly deflect the retaining ring 38 in the axial direction, so that due to the spring preload by subsequent slight rotation of the sliding block and the drill sleeve in FIG. 4 shown engagement position is taken automatically.

Mit Bezugszeichen 50 ist ein Anschlagmittel bei dem Haltering 38 dargestellt, welches eine axiale Endlage des Halterings 38 durch Anlage an einen Vorsprung des Maschinengehäuses 32 definiert.Reference numeral 50 a stop means in the retaining ring 38 is shown, which defines an axial end position of the retaining ring 38 by abutment against a projection of the machine housing 32.

Die drehfeste Anordnung des Bauteils 34 in Form des Halterings 38 gegenüber dem Maschinengehäuse 33 ist am besten aus Figuren 1 und 2 zu ersehen. Man erkennt mehrere nach radial außen vorstehende Vorsprünge 52 bei dem Haltering 38, die in entsprechende Ausnehmungen in dem Maschinengehäuse 33 eingreifen.The rotationally fixed arrangement of the component 34 in the form of the retaining ring 38 relative to the machine housing 33 is best Figures 1 and 2 to see. It can be seen a plurality of radially outwardly projecting projections 52 in the retaining ring 38, which engage in corresponding recesses in the machine housing 33.

Claims (10)

  1. Motor-driven tool device with hammer-drill operating mode an chisel operating mode, with a drive train (2), an output train (6) comprising a drill sleeve (10) an a hammer mechanism (8), and an adjusting unit for setting the hammer-drill operating mode or the chisel operating mode,
    wherein said adjusting unit comprises a sliding block (32) which is displaceable, via an internal toothing system (30), in the longitudinal direction of the drill sleeve (10) on an external toothing system (28) belonging to said drill sleeve (10), wherein the sliding block (32) is in engagement, in the chisel operating mode, by means of its internal toothing system (30) with a component (34) which is rotationally fixed to the machine housing (33) and thus positions the drill sleeve (10) in a non-twistable manner,
    characterised in that
    the component (34) which is rotationally fixed to the machine housing (33) is formed by a retaining ring (38) which has a section with an external toothing system (40) which is complementary to the internal toothing system (30) belonging to the sliding block (32) and in which said internal toothing system (30) engages,
    and that said internal toothing system (30) and the external toothing system (40) constitute an involute toothing system.
  2. Tool device according to Claim 1,
    characterised in that
    the component (34) which is rotationally fixed to the machine housing (33) is a plastic part.
  3. Tool device according to Claim 1 or 2,
    characterised in that
    the component (34) which is rotationally fixed to the machine housing (33) is displaceable to a limited extent in the axial direction (20) and is subjected to spring pretensioning in the direction of an end location and can thus be reflected to a limited extent against said spring pretensioning by the sliding block (32) in order to then pass into the position of engagement with the internal toothing system (30) belonging to the sliding block (32) when slight twisting of said sliding block (32) takes place.
  4. Tool device according to one or more of the preceding claims,
    characterised in that
    the component (34) which is rotationally fixed to the machine housing (33) and a spring (44, which brings about the spring pretensioning, surround the drill sleeve (10) on the periphery.
  5. Tool device according to Claim 4,
    characterised in that
    the spring (44) is supported, on the one hand, against an axial step (46) and, on the other hand, against an end face (48), which faces away from the sliding block (32), of the component (34) which is rotationally fixed to the machine housing (33).
  6. Tool device according to one or more of the preceding claims,
    characterised in that
    the component (34) which is rotationally fixed to the machine housing (33) has, radially outside the sliding block (32), a stop means (50) which defines its axial end location in the direction towards the sliding block (32).
  7. Tool device according to one or more of the preceding claims,
    characterised in that
    the component (34) which is rotationally fixed to the machine housing (33) is coupled in a rotationally fixed manner, via at least one, and preferably via a number of projections (52) which protrude radially outwards, to components of the machine housing (33).
  8. Tool device according to one or more of the preceding claims,
    characterised in that
    the adjusting unit at the same time forms two gear stages for the rotary drive of the drill sleeve (10).
  9. Tool device according to Claim 8,
    characterised in that
    the sliding block (32) has an external toothing system (42) with which a shaft belonging to the drive train (2) is in meshing driving connection in a first gear stage.
  10. Tool device according to Claim 8 or 9,
    characterised in that
    a driving gear belonging to the drive train (2) is in meshing driving connection with the external toothing system (28) belonging to the drill sleeve (10) in a second gear stage.
EP20100187470 2009-10-21 2010-10-13 Motor-driven tool device Active EP2314419B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910050013 DE102009050013A1 (en) 2009-10-21 2009-10-21 Motor driven power tool

Publications (2)

Publication Number Publication Date
EP2314419A1 EP2314419A1 (en) 2011-04-27
EP2314419B1 true EP2314419B1 (en) 2014-05-07

Family

ID=43513743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100187470 Active EP2314419B1 (en) 2009-10-21 2010-10-13 Motor-driven tool device

Country Status (2)

Country Link
EP (1) EP2314419B1 (en)
DE (1) DE102009050013A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201321893D0 (en) 2013-12-11 2014-01-22 Black & Decker Inc Rotary Hammer
EP3875224A1 (en) * 2020-03-03 2021-09-08 Hilti Aktiengesellschaft Device for positioning a chisel

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205840C2 (en) * 1992-02-26 1996-10-24 Kress Elektrik Gmbh & Co Hammer drill with chisel function
DE19724531B4 (en) * 1997-06-11 2005-07-14 Robert Bosch Gmbh Rotary Hammer
US6223833B1 (en) * 1999-06-03 2001-05-01 One World Technologies, Inc. Spindle lock and chipping mechanism for hammer drill
DE10205030A1 (en) * 2002-02-07 2003-08-21 Hilti Ag Operating mode switching unit of a hand machine tool
DE10355107B3 (en) * 2003-11-24 2005-08-11 Itw-Befestigungssysteme Gmbh Selektordrehschalter
DE102004012433A1 (en) * 2004-03-13 2005-09-29 Robert Bosch Gmbh Hand tool
US7325624B2 (en) * 2004-11-24 2008-02-05 Hitachi Koki Co., Ltd. Hammer drill having switching mechanism for switching operation modes
JP5116029B2 (en) * 2008-03-05 2013-01-09 株式会社マキタ Hammer drill

Also Published As

Publication number Publication date
EP2314419A1 (en) 2011-04-27
DE102009050013A1 (en) 2011-04-28

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