EP2314420B1 - Motor driven tool device with hammer drill operation mode - Google Patents

Motor driven tool device with hammer drill operation mode Download PDF

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Publication number
EP2314420B1
EP2314420B1 EP10187352A EP10187352A EP2314420B1 EP 2314420 B1 EP2314420 B1 EP 2314420B1 EP 10187352 A EP10187352 A EP 10187352A EP 10187352 A EP10187352 A EP 10187352A EP 2314420 B1 EP2314420 B1 EP 2314420B1
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EP
European Patent Office
Prior art keywords
tool
sleeve
appliance according
drilling sleeve
axial
Prior art date
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Active
Application number
EP10187352A
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German (de)
French (fr)
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EP2314420A1 (en
Inventor
Jan-Simon Blind
Michael Kukla
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Publication of EP2314420A1 publication Critical patent/EP2314420A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/006—Parallel drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • 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
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2222/57—Elastomers, e.g. rubber
    • 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
    • B25D2250/331—Use of bearings
    • B25D2250/335—Supports therefor

Definitions

  • the invention relates to a motor-driven tool device with drill hammer operating mode according to the preamble of claim 1, comprising a drive train and a drill sleeve and hammer mechanism comprehensive power train, wherein the drill sleeve is rotatably mounted relative to a machine housing radially about its longitudinal axis and further for receiving on the tool introduced axial forces via a rolling bearing assembly is axially supported.
  • This may therefore be, for example, a typical hammer drill in which the tool is both driven to rotate and undergoes a shocking action in the axial direction, which is exerted on the tool via a reciprocating so-called racket within the hammer mechanism.
  • a switchability to pure drilling operation and / or pure hammer or chisel operation, ie without rotating drive of the tool is possible in such typical tool devices.
  • DE 34 05 922 C2 describes a hammer drill in which a structural unit of percussion and drive train is supported so damped in the housing that it is supported by an O-ring and elastic axial.
  • the present invention is based on the object, tool devices of the type mentioned above to improve the convenience of operation for the user without sacrificing performance.
  • the damping elements exert an oppositely directed bias on the drill sleeve, so that it is held axially free of play relative to the machine housing.
  • the drill sleeve is thus held by means of the axially acting damping elements, that they are independent of the start of the Tool unit is received under oppositely directed bias and thus definitely held backlash in the machine housing.
  • the efficiency and smoothness is further increased.
  • the tool facing away from the damping element is provided on the side facing away from the drill sleeve side of the rolling bearing assembly. Furthermore, it proves to be advantageous if the tool facing away from the damping element is provided adjacent to and supported against an axial collar of a housing-fixed bearing sleeve.
  • the tool-facing damping element Since during operation of the power tool on the tool-facing damping element typically only small forces are exerted in the axial direction, it proves to be advantageous if the tool-facing damping element is received between two annular disk-shaped support elements, in turn, against two axially facing gradations in the machine housing or radially Support outside of the drill sleeve. On a complex rolling bearing assembly can be omitted here.
  • damping elements are formed annular disk-shaped and surround the drill sleeve concentrically.
  • the damping elements are advantageously formed from an elastomeric plastic material.
  • they may be foamed, polyurethane foam, silicone foam, sponge rubber and the like, for example, being advantageously usable here.
  • the play-free storage produced in the manner according to the invention also compensates production-related tolerances, which makes the production on the one hand less expensive and on the other hand reduces the power loss. It achieves higher efficiency in all modes and higher single beat energy values.
  • FIG. 1 shows a sectional view through a power tool in the form of a typical rotary hammer with optional adjustable hammer mode, Bohr explicatsart 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 reciprocating in an anvil guide 12 striker 14.
  • a tool chuck for example, for a drill bit or flat chisel is not shown and can be applied rotatably from the left to the drill sleeve.
  • 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. Further drives the intermediate shaft 4 via a swash plate assembly 18 and a corresponding to the double arrow 20 back and forth driven drive pin 22 a pressure sleeve 24 in the axial direction 26 back and forth.
  • the pressure sleeve 24 defines in its interior a compressed air cushion 28 between itself and a racket 30 of the hammer mechanism 8.
  • the drill sleeve 10 includes an axial step 38 in the form of a concentric flange 40. With this axial gradation 38 is the drill sleeve 10 axially against a roller bearing assembly 42 with needle bearing elements. Adjacent thereto, an annular disk-shaped support element 44 is provided, against which the damping element 34 rests. On the other side, the damping element 34 bears against a bearing sleeve 46, which is pressed into the machine housing 33. In this way, axial forces that are introduced during operation via the tool on the drill sleeve 10, transmitted in the direction of the machine housing 33 and thereby attenuated by the damping element 34, whereby a high smoothness arises.
  • the tool-facing damping element 36 is supported between facing axial gradations 48, 50 in the machine housing 33 and the drill sleeve 10.
  • a gradation 48 in turn is an annular disk-shaped support member 52 and against the step 50 an annular disk-shaped support member 54, between which the annular disk-shaped damping element 36 is provided.
  • the damping elements 34 and 36 are formed, dimensioned and arranged so that they exert a bias on the drill sleeve 10 even in the unloaded state, so that the drill sleeve 10 is arranged axially backlash in the machine housing 33. Also in this way creates a high level of smoothness, since the drill sleeve can perform vibrations to a much lesser extent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The device has an output strand (6) comprising a boring sleeve (10) and a forge. The boring sleeve is radially supported in a rotatable manner around a longitudinal axis in relation to a machine housing (33). The boring sleeve is axially supported via a roller bearing arrangement for receiving of axial forces that are induced at a tool. The boring sleeve is held in the machine housing at both axial sides by axial acting soft and elastic deformable damping elements (34, 36), which are designed in a circular disk type. The damping elements are made of plastic material/polyurethane foam.

Description

Die Erfindung betrifft ein motorisch angetriebenes Werkzeuggerät mit Bohrhammerbetriebsart gemäß dem Oberbegriff des Anspruchs 1, mit einem Antriebsstrang und einem eine Bohrhülse und ein Hammerwerk umfassenden Abtriebsstrang, wobei die Bohrhülse gegenüber einem Maschinengehäuse radial um ihre Längsachse drehbar gelagert ist und ferner zur Aufnahme von über das Werkzeug eingeleiteten Axialkräften über eine Wälzlageranordnung axial abgestützt ist. Es kann sich hierbei also beispielsweise um einen typischen Bohrhammer handeln, bei dem das Werkzeug sowohl rotierend antreibbar ist als auch eine in axialer Richtung hin und hergehende Stoßbeaufschlagung erfährt, die über einen hin und hergehenden sogenannten Schläger innerhalb des Hammerwerks auf das Werkzeug ausgeübt wird. Daneben ist bei derartigen typischen Werkzeuggeräten eine Umschaltbarkeit auf reinen Bohrbetrieb und/ oder auf reinen Hammer- oder Meißelbetrieb, also ohne rotierenden Antrieb des Werkzeugs möglich.The invention relates to a motor-driven tool device with drill hammer operating mode according to the preamble of claim 1, comprising a drive train and a drill sleeve and hammer mechanism comprehensive power train, wherein the drill sleeve is rotatably mounted relative to a machine housing radially about its longitudinal axis and further for receiving on the tool introduced axial forces via a rolling bearing assembly is axially supported. This may therefore be, for example, a typical hammer drill in which the tool is both driven to rotate and undergoes a shocking action in the axial direction, which is exerted on the tool via a reciprocating so-called racket within the hammer mechanism. In addition, a switchability to pure drilling operation and / or pure hammer or chisel operation, ie without rotating drive of the tool is possible in such typical tool devices.

DE 199 33 972 A1 beschreibt einen Bohrhammer gemäß dem Oberbegriff des Anspruchs 1, bei dem das Führungsrohr durch ein Dämpfungselement axial gegen die Rückschläge des Döppers gedämpft ist. DE 199 33 972 A1 describes a hammer drill according to the preamble of claim 1, wherein the guide tube is damped by a damping element axially against the setbacks of the striker.

DE 34 05 922 C2 beschreibt einen Bohrhammer, bei dem eine Baueinheit aus Schlagwerk und Antriebsstrang derart gedämpft im Gehäuse gelagert ist, dass sie durch einen O-Ring auch elastisch axial abgestützt ist. DE 34 05 922 C2 describes a hammer drill in which a structural unit of percussion and drive train is supported so damped in the housing that it is supported by an O-ring and elastic axial.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, Werkzeuggeräte der vorstehend genannten Art dahingehend zu verbessern, dass der Betrieb für den Benutzer komfortabler wird, und zwar ohne dass dies mit einer Reduzierung der Leistung verbunden wäre.The present invention is based on the object, tool devices of the type mentioned above to improve the convenience of operation for the user without sacrificing performance.

Diese Aufgabe wird bei einem Werkzeuggerät der genannten Art erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst, wobei die Bohrhülse zu beiden axialen Seiten hin über ein axial wirkendes nachgiebig elastisch verformbares Dämpfungselement in dem Maschinengehäuse gehalten ist.This object is achieved in a tool device of the type mentioned according to the invention by the features of claim 1, wherein the drill sleeve is held on both axial sides through an axially acting resilient resiliently deformable damping element in the machine housing.

Es wurde erfindungsgemäß festgestellt, dass in der Bohrhammerbetriebsart oder Meißelbetriebsart mit dem hin und hergehenden Antrieb des Schlägers des Hammerwerks auch eine axiale Kraftbeaufschlagung der Bohrhülse verbunden ist. Zwar dient die Bohrhülse nur als Aufnahme bzw. Lagerhülse für den Schläger, der nicht direkt axiale Kräfte auf die Bohrhülse ausübt. Infolge des typischerweise pneumatisch erzeugten Druckluftpolsters zum Antrieb des Schlägers werden jedoch beim Betrieb des Hammerwerks dennoch periodische axiale Kräfte auf die Bohrhülse erzeugt, die beim Betrieb axial auf das Maschinengehäuse und damit auf den Benutzer übertragen und von diesem aufgenommen werden müssen. Durch die erfindungsgemäß vorgesehenen Dämpfungselemente kann eine in unerwarteter Weise verbesserte Laufruhe erzielt werden. Dies führt des Weiteren zu einem erhöhten Wirkungsgrad, weil die Bohrhülse in sehr viel geringerem Maße mitschwingt als dies bei bekannten Bohrhämmern der Fall ist.It has been found according to the invention that in the hammer drill mode or bit mode with the reciprocating drive of the hammer of the hammer mechanism also an axial force is applied to the drill sleeve. Although the drill sleeve serves only as a receptacle or bearing sleeve for the racket, which does not exert direct axial forces on the drill sleeve. As a result of the typically pneumatically generated compressed air cushion for driving the racket, however, periodic axial forces are generated on the drill sleeve during operation of the hammer mill, which must be transmitted during operation axially on the machine housing and thus on the user and absorbed by the latter. By inventively provided damping elements in an unexpectedly improved smoothness can be achieved. This also leads to increased efficiency because the drill sleeve resonates to a much lesser extent than is the case with known rotary hammers.

In Weiterbildung dieses Erfindungsgedankens erweist es sich als besonders vorteilhaft, wenn die Dämpfungselemente eine gegensinnig gerichtete Vorspannung auf die Bohrhülse ausüben, so dass diese axial spielfrei gegenüber dem Maschinengehäuse gehalten ist. Die Bohrhülse wird also derart mittels der axial wirkenden Dämpfungselemente gehalten, dass sie unabhängig von der Inbetriebnahme des Werkzeuggeräts unter gegensinnig gerichteter Vorspannung aufgenommen und damit definitiv spielfrei im Maschinengehäuse gehalten ist. Hierdurch wird der Wirkungsgrad und die Laufruhe weiter erhöht.In development of this invention, it proves to be particularly advantageous if the damping elements exert an oppositely directed bias on the drill sleeve, so that it is held axially free of play relative to the machine housing. The drill sleeve is thus held by means of the axially acting damping elements, that they are independent of the start of the Tool unit is received under oppositely directed bias and thus definitely held backlash in the machine housing. As a result, the efficiency and smoothness is further increased.

Nach einer bevorzugten Ausführungsform der Erfindung ist das werkzeugabgewandte Dämpfungselement auf der von der Bohrhülse abgewandten Seite der Wälzlageranordnung vorgesehen. Weiter erweist es sich als vorteilhaft, wenn das werkzeugabgewandte Dämpfungselement angrenzend an und abgestützt gegen einen axialen Bund einer gehäusefesten Lagerhülse vorgesehen ist.According to a preferred embodiment of the invention, the tool facing away from the damping element is provided on the side facing away from the drill sleeve side of the rolling bearing assembly. Furthermore, it proves to be advantageous if the tool facing away from the damping element is provided adjacent to and supported against an axial collar of a housing-fixed bearing sleeve.

Zumindest bei dem werkzeugabgewandten Dämpfungselement wäre eine Anordnung angrenzend an eine axiale Stirnseite der Bohrhülse denkbar. Indessen erweist es sich als vorteilhaft, wenn das eine und/oder andere Dämpfungselement zwischen zwei einander axial zugewandten Abstufungen im Maschinengehäuse bzw. radial außen an der Bohrhülse vorgesehen ist.At least in the case of the damping element facing away from the tool, an arrangement adjacent to an axial end face of the drill sleeve would be conceivable. However, it proves to be advantageous if the one and / or other damping element is provided between two mutually axially facing gradations in the machine housing or radially outward on the drill sleeve.

Da im Betrieb des Werkzeuggeräts auf das werkzeugzugewandte Dämpfungselement typischerweise nur geringe Kräfte in axialer Richtung ausgeübt werden, erweist es sich als vorteilhaft, wenn das werkzeugzugewandte Dämpfungselement zwischen zwei ringscheibenförmigen Stützelementen aufgenommen ist, die sich ihrerseits gegen zwei einander axial zugewandte Abstufungen im Maschinengehäuse bzw. radial außen an der Bohrhülse abstützen. Auf eine aufwändige Wälzlageranordnung kann hier verzichtet werden.Since during operation of the power tool on the tool-facing damping element typically only small forces are exerted in the axial direction, it proves to be advantageous if the tool-facing damping element is received between two annular disk-shaped support elements, in turn, against two axially facing gradations in the machine housing or radially Support outside of the drill sleeve. On a complex rolling bearing assembly can be omitted here.

Es hat sich weiter als zweckmäßig und vorteilhaft erwiesen, wenn die Dämpfungselemente ringscheibenförmig ausgebildet sind und die Bohrhülse konzentrisch umgeben.It has further proven to be expedient and advantageous if the damping elements are formed annular disk-shaped and surround the drill sleeve concentrically.

Die Dämpfungselemente sind vorteilhafterweise aus einem elastomeren Kunststoffmaterial gebildet. Sie können insbesondere geschäumt ausgebildet sein, wobei hier beispielsweise Polyurethanschaum, Silikonschaum, Moosgummi und dergleichen in vorteilhafter Weise verwendet werden kann.The damping elements are advantageously formed from an elastomeric plastic material. In particular, they may be foamed, polyurethane foam, silicone foam, sponge rubber and the like, for example, being advantageously usable here.

Durch die auf die erfindungsgemäße Weise erzeugte spielfreie Lagerung werden auch fertigungsbedingte Toleranzen ausgeglichen, was die Herstellung einerseits preiswerter macht und andererseits die Verlustleistung reduziert. Es wird ein höherer Wirkungsgrad bei allen Betriebsarten und höhere Einzelschlagenergiewerte erzielt.The play-free storage produced in the manner according to the invention also compensates production-related tolerances, which makes the production on the one hand less expensive and on the other hand reduces the power loss. It achieves higher efficiency in all modes and higher single beat energy values.

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

Figur 1
eine Schnittansicht hier relevanter Komponenten des Antriebsstrangs und des Abtriebsstrangs des erfindungsgemäßen Werkzeuggeräts;
Figur 2
ein Detail Z der Figur 1 und
Figur 3
ein Detail Y von Figur 1.
Further features, details and advantages of the invention will become apparent from the appended claims and from the accompanying drawings and the following description of a preferred embodiment of the invention. In the drawing shows:
FIG. 1
a sectional view of relevant components of the drive train and the drive train of the power tool of the invention here;
FIG. 2
a detail Z of FIG. 1 and
FIG. 3
a detail Y of FIG. 1 ,

Figur 1 zeigt eine Schnittansicht durch ein motorisch angetriebenes Werkzeuggerät 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 einen in einer Döpperführung 12 hin- und herbewegbaren Döpper 14. Ein Werkzeugfutter, beispielsweise für einen Bohrmeißel oder Flachmeißel ist nicht dargestellt und kann von links auf die Bohrhülse drehfest aufgebracht werden. FIG. 1 shows a sectional view through a power tool in the form of a typical rotary hammer 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 reciprocating in an anvil guide 12 striker 14. A tool chuck, for example, for a drill bit or flat chisel is not shown and can be applied rotatably from the left to the drill sleeve.

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. Ferner treibt die Zwischenwelle 4 über eine Taumelscheibenanordnung 18 und einen entsprechend dem Doppelpfeil 20 hin und her gehend angetriebenen Antriebsstift 22 eine Druckhülse 24 in axialer Richtung 26 hin und her gehend an. Die Druckhülse 24 begrenzt in ihrem Inneren ein Druckluftpolster 28 zwischen sich und einem Schläger 30 des Hammerwerks 8. Ungeachtet des rotierenden Antriebs der Bohrhülse 10, der sich auf den Döpper 14 überträgt, wird durch den hin und her gehenden Antrieb der Druckhülse 24 eine hin und her gehende schlagende Hammerbewegung des Schlägers 30 erzeugt, die über die werkzeugzugewandte Stirnseite 33 des Schlägers 30 auf die nach innen gewandte Stirnseite des Döppers 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. Further drives the intermediate shaft 4 via a swash plate assembly 18 and a corresponding to the double arrow 20 back and forth driven drive pin 22 a pressure sleeve 24 in the axial direction 26 back and forth. The pressure sleeve 24 defines in its interior a compressed air cushion 28 between itself and a racket 30 of the hammer mechanism 8. Regardless of the rotating drive of the drill sleeve 10, which transmits to the striker 14, is due to the reciprocating drive of the pressure sleeve 24 a down and originating striking hammer movement of the racket 30 generated, which is transmitted via the tool-facing end face 33 of the racket 30 on the inwardly facing end face of the striker 14.

Mit der Erfindung wurde festgestellt, dass mit dem Betrieb des Hammerwerks 8 auch eine axiale Kraftbeaufschlagung der Bohrhülse 10 einhergeht, so dass die Bohrhülse 10 bei entsprechendem axialem Spiel innerhalb eines mit Bezugszeichen 33 angedeuteten Maschinengehäuses Schwingungen in axialer Richtung ausführt. Dem wird erfindungsgemäß begegnet, indem Dämpfungselemente 34, 36 die Bohrhülse zu beiden axialen Seiten stützen.With the invention it has been found that the operation of the hammer mechanism 8 is accompanied by an axial application of force to the drill sleeve 10, so that the drill sleeve 10 executes vibrations in the axial direction within a machine housing indicated by reference numeral 33 with corresponding axial play. This is counteracted according to the invention by damping elements 34, 36 support the drill sleeve to both axial sides.

Zunächst sei die werkzeugabgewandte Seite der Bohrhülse 10 betrachtet, wobei auch auf Figur 2 verwiesen wird. Die Bohrhülse 10 umfasst eine axiale Abstufung 38 in Form eines konzentrischen Flanschs 40. Mit dieser axialen Abstufung 38 liegt die Bohrhülse 10 axial gegen eine Wälzlageranordnung 42 mit Nadellagerelementen an. Daran angrenzend ist ein ringscheibenförmiges Stützelement 44 vorgesehen, gegen welches das Dämpfungselement 34 anliegt. Auf der anderen Seite liegt das Dämpfungselement 34 gegen eine Lagerhülse 46 an, die in das Maschinengehäuse 33 eingepresst ist. Auf diese Weise können axiale Kräfte, die im Betrieb über das Werkzeug auf die Bohrhülse 10 eingeleitet werden, in Richtung auf das Maschinengehäuse 33 übertragen und dabei durch das Dämpfungselement 34 gedämpft werden, wodurch eine hohe Laufruhe entsteht.First, the tool facing away side of the drill sleeve 10 is considered, including on FIG. 2 is referenced. The drill sleeve 10 includes an axial step 38 in the form of a concentric flange 40. With this axial gradation 38 is the drill sleeve 10 axially against a roller bearing assembly 42 with needle bearing elements. Adjacent thereto, an annular disk-shaped support element 44 is provided, against which the damping element 34 rests. On the other side, the damping element 34 bears against a bearing sleeve 46, which is pressed into the machine housing 33. In this way, axial forces that are introduced during operation via the tool on the drill sleeve 10, transmitted in the direction of the machine housing 33 and thereby attenuated by the damping element 34, whereby a high smoothness arises.

Auch das werkzeugzugewandte Dämpfungselement 36 ist zwischen einander zugewandten axialen Abstufungen 48, 50 im Maschinengehäuse 33 und an der Bohrhülse 10 abgestützt. Gegen die Abstufung 48 liegt wiederum ein ringscheibenförmiges Stützelement 52 und gegen die Abstufung 50 ein ringscheibenförmiges Stützelement 54 an, zwischen denen das ringscheibenförmige Dämpfungselement 36 vorgesehen ist.The tool-facing damping element 36 is supported between facing axial gradations 48, 50 in the machine housing 33 and the drill sleeve 10. Against the gradation 48 in turn is an annular disk-shaped support member 52 and against the step 50 an annular disk-shaped support member 54, between which the annular disk-shaped damping element 36 is provided.

Die Dämpfungselemente 34 und 36 sind derart ausgebildet, dimensioniert und angeordnet, dass sie auch im unbelasteten Zustand eine Vorspannung auf die Bohrhülse 10 ausüben, so dass die Bohrhülse 10 axial spielfrei im Maschinengehäuse 33 angeordnet ist. Auch auf diese Weise entsteht eine hohe Laufruhe, da die Bohrhülse in viel geringerem Maße Schwingungen ausführen kann.The damping elements 34 and 36 are formed, dimensioned and arranged so that they exert a bias on the drill sleeve 10 even in the unloaded state, so that the drill sleeve 10 is arranged axially backlash in the machine housing 33. Also in this way creates a high level of smoothness, since the drill sleeve can perform vibrations to a much lesser extent.

Claims (8)

  1. Motor-driven tool appliance with a hammer-drill operating mode, having a drive train (2) and an output train (6) comprising a drilling sleeve (10) and a hammer mechanism (88), wherein the drilling sleeve (10) is mounted to as to be rotatable radially about its longitudinal axis in relation to a machine casing (33) and is also supported axially, at least via one rolling bearing arrangement (42), for absorbing axial forces introduced via the tool,
    characterised in that
    the drilling sleeve (10) is held in the machine casing (33), in the direction of both axial sides, via an axially acting damping element (34, 36) which is elastically deformable in a flexible manner.
  2. Tool appliance according to claim 1,
    characterised in that
    the damping elements (34, 36) exert oppositely directed pretension upon the drilling sleeve (10), so that said drilling sleeve is held without axial play in relation to the machine casing (33).
  3. Tool appliance according to claim 1 or 2,
    characterised in that
    the damping element (34) that faces away from the tool is provided on that side of the rolling bearing arrangement (42) which faces away from the drilling sleeve (10).
  4. Tool appliance according to claim 1, 2 or 3,
    characterised in that
    the damping element (34) that faces away from the tool is provided in a manner adjacent to, and supported against, an axial collar belonging to a bearing sleeve (46) integral with the casing.
  5. Tool appliance according to one of the preceding claims, characterised in that
    one and/or other damping element (34, 36) is/are provided between two stepped portions (38; 48, 50) that face towards one another axially within the machine casing (33), and radially outside on the drilling sleeve (10).
  6. Tool appliance according to one of the preceding claims, characterised in that
    the damping element (36) that faces towards the tool is received between two annular-disc-shaped supporting elements (52, 54) which, in turn, are supported against two stepped portions (48, 50) that face towards one another axially within the machine casing (33), and radially outside on the drilling sleeve (10).
  7. Tool appliance according to one of the preceding claims, characterised in that
    the damping elements (34, 36) are of annular-disc-shaped construction and surround the drilling sleeve (10) concentrically.
  8. Tool appliance according to one of the preceding claims, characterised in that
    the damping elements (34, 36) are formed from elastomeric plastic material.
EP10187352A 2009-10-21 2010-10-13 Motor driven tool device with hammer drill operation mode Active EP2314420B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009050014A DE102009050014B4 (en) 2009-10-21 2009-10-21 Motor driven tool tool with hammer drill operating mode

Publications (2)

Publication Number Publication Date
EP2314420A1 EP2314420A1 (en) 2011-04-27
EP2314420B1 true EP2314420B1 (en) 2012-05-09

Family

ID=43587176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10187352A Active EP2314420B1 (en) 2009-10-21 2010-10-13 Motor driven tool device with hammer drill operation mode

Country Status (3)

Country Link
EP (1) EP2314420B1 (en)
AT (1) ATE556820T1 (en)
DE (1) DE102009050014B4 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011081617A1 (en) * 2011-08-26 2013-02-28 Hilti Aktiengesellschaft Hand-held machine tool
JP2013151055A (en) * 2012-01-26 2013-08-08 Makita Corp Striking tool
SE537773C2 (en) 2012-02-17 2015-10-13 Tools Pc Ab Const Impact device containing a recoil damper
DE102012212231A1 (en) 2012-07-12 2014-01-16 Hilti Aktiengesellschaft Hand tool
EP3822030A1 (en) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Drill and/or chisel hammer with impact device assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756993A1 (en) * 1977-12-21 1979-07-05 Duss Maschf ELECTROPNEUMATIC HAMMER WITH CATCH RING FOR THE PISTON
US4431062A (en) * 1980-01-09 1984-02-14 Robert Bosch Gmbh Rotating drive for impact hammer
DE3405922A1 (en) * 1984-02-18 1985-08-22 Robert Bosch Gmbh, 7000 Stuttgart HAND MACHINE, ESPECIALLY DRILLING HAMMER
DE19933972A1 (en) * 1999-07-20 2001-01-25 Bosch Gmbh Robert Hammer drill or hammer

Also Published As

Publication number Publication date
DE102009050014A1 (en) 2011-06-09
DE102009050014B4 (en) 2013-07-11
EP2314420A1 (en) 2011-04-27
ATE556820T1 (en) 2012-05-15

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