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EP2314419A1 - Motor-driven tool device - Google Patents

Motor-driven tool device Download PDF

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Publication number
EP2314419A1
EP2314419A1 EP10187470A EP10187470A EP2314419A1 EP 2314419 A1 EP2314419 A1 EP 2314419A1 EP 10187470 A EP10187470 A EP 10187470A EP 10187470 A EP10187470 A EP 10187470A EP 2314419 A1 EP2314419 A1 EP 2314419A1
Authority
EP
European Patent Office
Prior art keywords
sliding block
machine housing
tool according
drill sleeve
toothing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10187470A
Other languages
German (de)
French (fr)
Other versions
EP2314419B1 (en
Inventor
Michael Kukla
Jan-Simon Blind
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2314419A1 publication Critical patent/EP2314419A1/en
Application granted granted Critical
Publication of EP2314419B1 publication Critical patent/EP2314419B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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, with a drive train, a drill sleeve and a hammer mill comprehensive power train and an adjustment for adjusting the hammer drill mode or the chisel mode, wherein the adjusting unit comprises a sliding block, which has an internal toothing on an external toothing Drill sleeve is displaceable in the longitudinal direction of the drill sleeve.
  • Drill sleeve is displaceable in the longitudinal direction of the drill sleeve.
  • 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.
  • a switchover to pure drilling operation and / or pure hammer or chisel operation ie without rotating drive of the tool possible.
  • 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.
  • 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, to effect a rotationally fixed coupling.
  • the applicant has already submitted the proposal to weld a locking ring on the sliding block, which engages in a housing-fixed recess.
  • this is costly and expensive and brings additional requirements for the coaxiality of the components to be welded together with it.
  • 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.
  • 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 rotatable component with the machine housing in the axial direction and in the radial direction has recesses opening into which engages the internal toothing of the sliding block.
  • the mentioned non-rotatable component can 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.
  • 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 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.
  • 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 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.
  • 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, in which the Internal toothing of the sliding block engages in the chisel mode.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIGS. 3 and 4 show the interior of a power tool in the form of a typical hammer drill with optional adjustable hammer mode, Bohr réellesart 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.
  • 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.
  • 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.
  • 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.
  • 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, which is supported on the one hand 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.
  • 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 with a projection of the machine housing 32.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)

Abstract

The tool has a drive train (2), an output train (6) comprising a drill sleeve (10), and an adjusting unit for adjusting drill hammer mode or chisel operating mode. The adjusting unit has a sliding block (32) that is moved on an external tooth (28) of the sleeve in a longitudinal direction of the sleeve over an internal tooth (30). The block and internal tooth stay in engagement with a component (34) i.e. retaining ring (38), in the chisel operating mode, so that the sleeve is arranged in a non-rotatable position. The component is fixed to a machine housing and made from plastic.

Description

Die Erfindung betrifft ein motorisch angetriebenes Werkzeuggerät mit Bohrhammerbetriebsart und Meißelbetriebsart, 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. 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, um eine drehfeste Kopplung zu bewirken. Von der Anmelderin wurde bereits der Vorschlag unterbreitet, an den Schiebeblock einen Rastring aufzuschweißen, der in 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, with a drive train, a drill sleeve and a hammer mill comprehensive power train and an adjustment for adjusting the hammer drill mode or the chisel mode, wherein the adjusting unit comprises a sliding block, which has an internal toothing on an external toothing Drill sleeve is displaceable in the longitudinal direction of the drill sleeve. 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, to effect a rotationally fixed coupling. The applicant has already submitted the proposal to weld a locking ring on the sliding block, which engages in 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.

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.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.

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. The mentioned with the machine housing rotatable component can either be formed by the machine housing itself, so be integral with this, or it can by an additional rotationally fixed to the machine housing be arranged arranged 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.

Des Weiteren erweist es sich als vorteilhaft, wenn das mit dem Maschinengehäuse drehfeste Bauteil in axialer Richtung und in radialer Richtung öffnende Vertiefungen aufweist, in welche die Innenverzahnung des Schiebeblocks eingreift.Furthermore, it proves to be advantageous if the rotatable component with the machine housing in the axial direction and in the radial direction has recesses opening into which engages the internal toothing of the sliding block.

Das erwähnte drehfeste Bauteil kann in vorteilhafter Weise von einem Kunststoffteil gebildet sein, das lediglich zur drehfesten Fixierung des Schiebeblocks durch Formschluss beansprucht wird.The mentioned non-rotatable component can 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 which is rotationally fixed with respect to the machine housing, then the component will be in opposition to it Spring preload axially deflected. Then, then, the tool or the drill sleeve manually or in the course of operation of the power tool slightly twisted, 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 besonders bevorzugten Ausführungsform der Erfindung 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.According to a particularly preferred embodiment of the invention, 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, in which the Internal toothing of the sliding block engages in the chisel mode.

Hierbei kann es sich sowohl bei der Innenverzahnung als auch bei der Außenverzahnung um eine Evolventenverzahnung handeln.This can be an involute toothing both in the internal toothing and in the external toothing.

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 22 erzeugt, die über die werkzeugzugewandte Stirnseite 26 des Schlägers 22 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 transfers to the tool 14, a reciprocating hammering action of the racket 22 is generated by the reciprocating drive of the pressure sleeve 18, which is transmitted via the tool-facing end face 26 of the racket 22 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 28 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 28 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 is 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, which is supported on the one hand 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 with 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 (13)

Motorisch angetriebenes Werkzeuggerät mit Bohrhammerbetriebsart und Meißelbetriebsart, mit einem Antriebsstrang (2), einem eine Bohrhülse (10) und ein Hammerwerk (8) umfassenden Abtriebsstrang (6) und einer Verstelleinheit zum Einstellen der Bohrhammerbetriebsart oder der Meißelbetriebsart, wobei die Verstelleinheit einen Schiebeblock (32) umfasst, der über eine Innenverzahnung (30) auf einer Außenverzahnung (28) der Bohrhülse (10) in Längsrichtung der Bohrhülse (10) verschieblich ist, dadurch gekennzeichnet, dass der Schiebeblock (32) in der Meißelbetriebsart mit seiner Innenverzahnung (30) in Eingriff mit einem mit dem Maschinengehäuse (33) drehfesten Bauteil (34) steht und so die Bohrhülse (10) unverdrehbar stellt.A power tool having a hammer drill mode and a chisel mode, a power train (6) comprising a drill sleeve (10) and a hammer mill (8), and an adjustment unit for adjusting the hammer drill mode or the bit mode, wherein the adjustment unit comprises a sliding block (32 ), which on an external toothing (28) of the drill sleeve (10) in the longitudinal direction of the drill sleeve (10) is displaceable, characterized in that the sliding block (32) in the chisel mode with its internal toothing (30) in Engagement with a with the machine housing (33) non-rotatable component (34) and so the drill sleeve (10) is non-rotatable. Werkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) in axialer Richtung (20) und in radialer Richtung öffnende Vertiefungen (36) aufweist, in welche die Innenverzahnung (30) des Schiebeblocks (32) eingreift.Tool according to claim 1, characterized in that with the machine housing (33) non-rotatable component (34) in the axial direction (20) and in the radial direction opening recesses (36) into which the internal toothing (30) of the sliding block (32) intervenes. Werkzeuggerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) ein Kunststoffteil ist.Tool according to claim 1 or 2, characterized in that with the machine housing (33) non-rotatable component (34) is a plastic part. Werkzeuggerät nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) in axialer Richtung (20) begrenzt verschieblich ist und in Richtung auf eine Endlage unter Federvorspannung steht und so entgegen der Federvorspannung durch den Schiebeblock (32) begrenzt auslenkbar ist, um anschließend bei geringfügiger Verdrehung des Schiebeblocks (32) in die Eingriffstellung mit der Innenverzahnung (30) des Schiebeblocks (32) zu treten.Tool according to claim 1, 2 or 3, characterized in that with the machine housing (33) non-rotatable component (34) in the axial direction (20) is limitedly displaceable and in the direction of an end position is spring-biased and so against the spring bias by the sliding block (32) is limited deflected to then with slight rotation of the sliding block (32) in the engaged position with the internal teeth (30) of the sliding block (32). Werkzeuggerät nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) und eine die Federvorspannung bewirkende Feder (44) die Bohrhülse (10) umfangsseitig umgeben.Tool according to one or more of the preceding claims, characterized in that with the machine housing (33) non-rotatable component (34) and a spring bias causing spring (44) surrounding the drill sleeve (10) circumferentially. Werkzeuggerät nach Anspruch 5, dadurch gekennzeichnet, dass die Feder (44) einerseits gegen eine axiale Stufe (46) und andererseits gegen eine vom Schiebeblock (32) abgewandte Stirnseite (48) des mit dem Maschinengehäuse (33) drehfesten Bauteils (34) abgestützt ist.Tool according to claim 5, characterized in that the spring (44) on the one hand against an axial step (46) and on the other hand against a sliding block (32) facing away from end face (48) of the machine housing (33) rotatably fixed member (34) is supported , Werkzeuggerät nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) radial außerhalb des Schiebeblocks (32) ein Anschlagmittel (50) aufweist, welches seine axiale Endlage in Richtung auf den Schiebeblock (32) definiert.Tool according to one or more of the preceding claims, characterized in that with the machine housing (33) non-rotatable component (34) radially outside the sliding block (32) has a stop means (50) which its axial end position in the direction of the sliding block (32 ) Are defined. Werkzeuggerät nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) über wenigstens einen, vorzugsweise über mehrere nach radial außen vorstehende Vorsprünge (52) drehfest mit Komponenten des Maschinengehäuses (33) gekoppelt ist.Tool according to one or more of the preceding claims, characterized in that with the machine housing (33) non-rotatable component (34) via at least one, preferably over a plurality of radially outwardly projecting projections (52) rotatably coupled to components of the machine housing (33) , Werkzeuggerät nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das mit dem Maschinengehäuse (33) drehfeste Bauteil (34) von einem Haltering (38) gebildet ist, der einen Abschnitt mit einer zur Innenverzahnung (30) des Schiebeblocks (32) komplementären Außenverzahnung (40) aufweist, in die die Innenverzahnung (30) eingreift.Tool according to one or more of the preceding claims, characterized in that with the machine housing (33) non-rotatable member (34) by a retaining ring (38) is formed, which has a portion with an internal toothing (30) of the sliding block (32) complementary External toothing (40), in which engages the internal toothing (30). Werkzeuggerät nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, das die Innenverzahnung (30) und die Außenverzahnung (40) eine Evolventenverzahnung ist.Tool according to one or more of the preceding claims, characterized in that the internal toothing (30) and the external toothing (40) is an involute toothing. Werkzeuggerät nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Verstelleinheit zugleich zwei Getriebestufen für den Drehantrieb der Bohrhülse (10) bildet.Tool according to one or more of the preceding claims, characterized in that the adjusting unit also forms two gear stages for the rotary drive of the drill sleeve (10). Werkzeuggerät nach Anspruch 11, dadurch gekennzeichnet, dass der Schiebeblock (32) eine Außenverzahnung (42) aufweist, mit der in einer ersten Getriebestufe eine Welle des Antriebsstrangs (2) in kämmender Antriebsverbindung steht.Tool according to claim 11, characterized in that the sliding block (32) has an outer toothing (42) with which in a first gear stage, a shaft of the drive train (2) is in meshing drive connection. Werkzeuggerät nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass in einer zweiten Getriebestufe ein Antriebsrad des Antriebsstrangs (2) mit der Außenverzahnung (28) der Bohrhülse (10) in kämmender Antriebsverbindung steht.Tool according to claim 11 or 12, characterized in that in a second gear stage, a drive wheel of the drive train (2) with the external toothing (28) of the drill sleeve (10) is in meshing drive connection.
EP20100187470 2009-10-21 2010-10-13 Motor-driven tool device Active EP2314419B1 (en)

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DE200910050013 DE102009050013A1 (en) 2009-10-21 2009-10-21 Motor driven power tool

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EP3875224A1 (en) * 2020-03-03 2021-09-08 Hilti Aktiengesellschaft Device for positioning a chisel

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EP3875224A1 (en) * 2020-03-03 2021-09-08 Hilti Aktiengesellschaft Device for positioning a chisel
WO2021175657A1 (en) * 2020-03-03 2021-09-10 Hilti Aktiengesellschaft Device for resetting a chisel
US12023793B2 (en) 2020-03-03 2024-07-02 Hilti Aktiengesellschaft Apparatus for adjusting a chisel

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