EP2561962A1 - Machine-outil manuelle - Google Patents
Machine-outil manuelle Download PDFInfo
- Publication number
- EP2561962A1 EP2561962A1 EP12175665A EP12175665A EP2561962A1 EP 2561962 A1 EP2561962 A1 EP 2561962A1 EP 12175665 A EP12175665 A EP 12175665A EP 12175665 A EP12175665 A EP 12175665A EP 2561962 A1 EP2561962 A1 EP 2561962A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide tube
- impact
- suspension
- ring
- clutch
- 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
Links
- 239000000725 suspension Substances 0.000 claims abstract description 20
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 description 4
- 238000009527 percussion Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
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
- B25D17/24—Damping the reaction force
-
- 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
- B25D16/003—Clutches specially adapted therefor
-
- 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
-
- 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
- B25D2250/131—Idling mode of tools
-
- 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
- B25D2250/165—Overload clutches, torque limiters
-
- 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
- B25D2250/245—Spatial arrangement of components of the tool relative to each other
-
- 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
Definitions
- the present invention relates to a hand tool with a, preferably pneumatic, hammer mechanism, e.g. a hammer drill.
- a hammer drill strikes a chisel with a mallet hammer to drive it into a ground.
- the pulse of the club is transmitted efficiently to the bit.
- the chisel does not touch a workpiece, the result is a blank.
- the racket runs into a front stop and gives the impulse to the hand tool.
- damping rings e.g. made of an elastomer, to absorb the forces and to protect the hammer drill.
- the hand tool of the invention has a housing, a striking mechanism and a torque coupling.
- the impact mechanism includes a racket movably guided in a guide tube along a working axis.
- the guide tube is movably mounted in a housing attached to the suspension suspension along the working axis.
- the torque coupling is mounted on the guide tube and supported in the direction of impact on the suspension.
- the guide tube is supported on the torque coupling in the direction of impact.
- the guide tube can slide with respect to the housing in the direction of impact, wherein the torque coupling is forcibly moved by the guide tube relative to the housing.
- the impulse in the strike direction which is transmitted to the guide tube when it is empty, is introduced into the housing via the torque coupling.
- the torque coupling acts as a delay element.
- the torque clutch expediently has a return spring, which exerts a force on the suspension in the direction of impact and on the guide tube against the direction of impact. The return spring expands the transmission of the pulse to the housing and thus the forces occurring.
- An embodiment provides that the torque coupling in the direction of impact successively a first clutch disc, a second clutch disc and a Return spring includes.
- the guide tube is supported in the direction of impact on the first clutch disc or second clutch disc.
- the return spring acts in the direction of impact on the suspension and against the direction of impact on the second clutch disc.
- the guide tube can, but only with entrainment of at least one of the clutch discs, move in the direction of impact.
- the arranged between the suspension and the clutch discs return spring is compressed.
- the engagement of the guide tube can also take place between the two clutch discs, whereby the first clutch disc is lifted from the second clutch disc when looking up. The clutch is thus briefly released when looking up and the torque transmission is interrupted.
- Another embodiment engages directly on the return spring to use this to dampen the lookup of the blank.
- the suspension includes a first ring rigidly connected to the housing and a second ring encompassing the guide tube.
- the guide tube is axially movable in the second ring and the second ring abuts the first ring in the direction of impact.
- the return spring may rest against the second ring.
- Fig. 1 shows a hammer drill 1 as an example of a chiseling hand tool.
- the hammer drill 1 can rotationally drive a drill bit 2 about a working axis 3 and propel the drill bit 2 along the working axis 3 in the direction of impact 4 .
- An operating mode of the hammer drill 1 allows a simultaneous turning and hitting for a rotary cutting stone, masonry etc.
- a tool holder 5 has locking elements 6, which secures the drill bit 2 in the tool holder 5 against falling out and at the same time allows limited movement of the drill bit 2 along the working axis 3 in the tool holder 5 .
- the locking elements 6 are constructed complementary to the drill bit 2 , here for example in the form of radially displaceable balls, which in along the working axis closed locking grooves of the drill bit 2 can engage.
- the tool holder 5 also inhibits a relative rotational movement of the drill bit 2, for example by radially projecting Drehmit Spotifystege 7, which engage in corresponding open rotational drive grooves of the drill bit 2 .
- the tool holder 5 holds the drill bit 2 in such a way that a percussion mechanism 9 can strike a rear end face of the drill bit 2 . Furthermore, the tool holder 5 is non-rotatably coupled to a rotary drive 10 in order to transmit a torque output by the rotary drive 10 to the drill bit 2 .
- the percussion mechanism 9 is, for example, a pneumatic percussion mechanism 9.
- An exciter 11 and a racket 12 are movably guided in a guide tube 13 along the working axis 3 .
- the exciter 11 is coupled via an eccentric 14 or a wobble finger to a motor 15 and forced to a periodic, translational movement.
- An air spring formed by a pneumatic chamber 16 between exciter 11 and racket 12 couples a movement of the racket 12 to the movement of the exciter 11 at.
- the racket 12 can strike directly on a rear end of the drill bit 2 or indirectly transfer part of its pulse to the drill bit 2 via an intermediate racket 17 (striker) resting essentially in the guide tube 13 .
- the rotary drive 10 has, for example, an output spindle 18 which is releasably or non-detachably coupled to the tool holder 5 in a torsionally rigid manner.
- the output spindle 18 may be, for example, a hollow, the impact mechanism 9 encompassing shaft, for example, the guide tube 13 .
- the output spindle 18 is coupled to the motor 15 via a drive train.
- the powertrain may include, among others, a single or multi-stage transmission 20 and a torque clutch 21 .
- the torque coupling 21 is designed in particular as an overload protection and interrupts the drive train if a torque acting on the drill bit 2 from the motor 15 exceeds a limit value.
- the motor 15, the striking mechanism 9, and the rotary drive 10 are preferably arranged in a machine housing 22 .
- An inextricably connected to the machine housing 22 handle 23 allows the user to hold the hammer drill 1 and lead.
- the motor 15 is activated and the hammer drill 1 is put into operation.
- Selector switch for example, selectively connect the hammer mechanism 9 and / or the rotary drive 10 during operation.
- the exemplary torque clutch 21 has a first clutch plate 25 and a second clutch plate 26, which are arranged coaxially with the guide tube 13 .
- the first clutch plate 25 meshes with the gear 20 and is mounted so loosely on the guide tube 13 that the first clutch plate 25 can rotate relative to the guide tube 13 .
- the second clutch disc 26 meshes with the guide tube 13 via a toothing 27.
- the exemplary clutch discs 25, 26 have flat end surfaces which transmit torque to one another via static friction.
- the first clutch plate 25 or second clutch plate 26 may be provided with cams or other structures engaging the opposing clutch plate.
- the second clutch plate 26 is displaceable on the guide tube 13 along the working axis 3 and relative to the first clutch plate 25 .
- the torque clutch 21 is closed when the two clutch plate 25, 26 contact each other and thus transmit torque from the gear 20 to the guide tube 13 ergo from the motor 15 to the tool holder 5.
- a return spring 28 acts on the movable second clutch plate 26 and pushes them toward the first clutch plate 25, here for example counter to the direction of impact 4.
- the torque clutch 21 is closed in its normal position.
- the first clutch plate 25 bears against the direction of impact 4 against a radial projection 29 of the guide tube 13 , which inhibits movement of the first clutch disc 25 against the direction of impact 4 beyond this projection 29 .
- the projection 29 may include, for example, a patch on the guide tube 13 ring, which is axially secured by a snap ring on the guide tube 13 .
- the guide tube 13 is slidably suspended in the machine housing 22 along the working axis 3 .
- the guide tube 13 can absorb a portion of the kinetic energy.
- a suspension 32 of the guide tube 13 on the machine housing 22 includes, for example, an inner ring 33 and an outer ring 34.
- the inner ring 33 is inserted into the outer ring 34 and rotatably supported therein about the working axis 3 .
- the bearing can contain a simple plain bearing or roller bearings.
- the outer ring 34 forms a counter to the direction of impact 4 facing stop surface 35 for the inner ring 33 .
- the exemplary outer ring 34 has no opposite to the direction of impact 4 extending movement of the inner ring 33 limiting abutment surface.
- the guide tube 13 is inserted into the inner ring 33 .
- the inner ring 33 is opposite the guide tube 13 axially movable.
- the outer ring 34 is fixed to the machine housing 22 axially immovable. An embodiment, not shown, does not provide separation of the suspension 32 into the relatively rotatable rings 33, 34 .
- the return spring 28 is supported in the direction of impact 4 on the inner ring 33 of the suspension 32 from.
- a force is applied via the projection 29 in the axially opposite the machine housing 22 movable clutch plates 25, 26 by the return spring 28 and at least in the direction of impact 4 relative to the machine housing 22 immovable suspension 32nd Die
- the Return spring 28 is compressed.
- the return spring 28 abuts on a side facing in the direction of impact 4 surface 36 of the second clutch disc 26 and at an opposite to the striking direction 4 facing surface 37 of the inner ring 33rd
- the guide tube 13 is mounted on the machine housing 22 via other suspensions, they all allow relative movement of the guide tube 13 relative to the machine housing 22 along the working axis 3.
- the transmission 20 has a ring gear 38 with an internal toothing.
- the ring gear 38 is arranged coaxially with the first clutch disk 25 and meshes with an external toothing of the first clutch disk 25.
- a further embodiment provides that the second clutch disc 26 bears in contact with the radial projection 29 .
- the radial projection 29 is disposed between the two clutch plates 25, 26 .
- a force introduction of the moving guide tube 13 is carried out omitting the first clutch plate 25.
- the moving guide tube 13 separates the two clutch plates along the working axis 3 and thus opens the torque coupling 21.
- the first clutch disc 25 against the machine housing 22 along the working axis 3 immovably be arranged.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Handwerkzeugmaschine mit einem, vorzugsweise pneumatischen, Schlagwerk, z.B. einen Bohrhammer. Der Bohrhammer schlägt mit einem Schläger des Schlagwerks auf einen Meißel, um diesen in einen Untergrund einzutreiben. Der Impuls des Schlägers wird effizient auf den Meißel übertragen. Falls der Meißel jedoch nicht an einem Werkstück anliegt, ergibt sich ein Leerschlag. Der Schläger läuft in einen vorderen Anschlag und gibt den Impuls an die Handwerkzeugmaschine ab. Bekannt ist den vorderen Anschlag mit Dämpfungsringen, z.B. aus einem Elastomer, zu versehen, um die auftretenden Kräfte zu absorbieren und den Bohrhammer zu schützen.The present invention relates to a hand tool with a, preferably pneumatic, hammer mechanism, e.g. a hammer drill. The hammer drill strikes a chisel with a mallet hammer to drive it into a ground. The pulse of the club is transmitted efficiently to the bit. However, if the chisel does not touch a workpiece, the result is a blank. The racket runs into a front stop and gives the impulse to the hand tool. Known is the front stop with damping rings, e.g. made of an elastomer, to absorb the forces and to protect the hammer drill.
Die erfindungsgemäße Handwerkzeugmaschine hat ein Gehäuse, ein Schlagwerk und eine Drehmomentkupplung. Das Schlagwerk beinhaltet einen in einem Führungsrohr längs einer Arbeitsachse beweglich geführten Schläger. Das Führungsrohr ist in einer an dem Gehäuse befestigten Aufhängung längs der Arbeitsachse beweglich gelagert. Die Drehmomentkupplung ist auf dem Führungsrohr gelagert und in Schlagrichtung an der Aufhängung abgestützt. Das Führungsrohr ist an der Drehmomentkupplung in Schlagrichtung abgestützt. Das Führungsrohr kann sich gegenüber dem Gehäuse in Schlagrichtung verschieben, wobei die Drehmomentkupplung zwangsgeführt durch das Führungsrohr relativ zu dem Gehäuse verschoben wird.The hand tool of the invention has a housing, a striking mechanism and a torque coupling. The impact mechanism includes a racket movably guided in a guide tube along a working axis. The guide tube is movably mounted in a housing attached to the suspension suspension along the working axis. The torque coupling is mounted on the guide tube and supported in the direction of impact on the suspension. The guide tube is supported on the torque coupling in the direction of impact. The guide tube can slide with respect to the housing in the direction of impact, wherein the torque coupling is forcibly moved by the guide tube relative to the housing.
Der bei einem Leerschlag auf das Führungsrohr übertragene Impuls in Schlagrichtung wird über die Drehmomentkupplung in das Gehäuse eingeleitet. Die Drehmomentkupplung wirkt als Verzögerungselement. Die Drehmomentkupplung hat zweckmäßigerweise eine Rückstellfeder, welche auf die Aufhängung eine Kraft in Schlagrichtung und auf das Führungsrohr eine Kraft entgegen der Schlagrichtung ausübt. Die Rückstellfeder dehnt die Weiterleitung des Impulses an das Gehäuse und damit die auftretenden Kräfte.The impulse in the strike direction, which is transmitted to the guide tube when it is empty, is introduced into the housing via the torque coupling. The torque coupling acts as a delay element. The torque clutch expediently has a return spring, which exerts a force on the suspension in the direction of impact and on the guide tube against the direction of impact. The return spring expands the transmission of the pulse to the housing and thus the forces occurring.
Eine Ausgestaltung sieht vor, dass die Drehmomentkupplung in der Schlagrichtung aufeinanderfolgend eine erste Kupplungsscheibe, eine zweite Kupplungsscheibe und eine Rückstellfeder beinhaltet. Das Führungsrohr ist in Schlagrichtung an der ersten Kupplungsscheibe oder zweiten Kupplungsscheibe abgestützt. Die Rückstellfeder wirkt in Schlagrichtung auf die Aufhängung und entgegen der Schlagrichtung auf die zweite Kupplungsscheibe. Das Führungsrohr kann sich, aber nur unter Mitnahme wenigstens einer der Kupplungsscheiben, in Schlagrichtung bewegen. Die zwischen der Aufhängung und den Kupplungsscheiben angeordnete Rückstellfeder wird dabei komprimiert. Der Eingriff des Führungsrohrs kann auch zwischen den beiden Kupplungsscheiben erfolgen, wodurch beim Nachschlagen die erste Kupplungsscheibe von der zweiten Kupplungsscheibe abhoben wird. Die Kupplung wird beim Nachschlagen somit kurzzeitig gelöst und die Drehmomentübertragung unterbrochen. Eine weitere Ausführung hintergreift greift direkt auf die Rückstellfeder, um diese zum Dämpfen des Nachschlagens des Leerschlags zu nutzen.An embodiment provides that the torque coupling in the direction of impact successively a first clutch disc, a second clutch disc and a Return spring includes. The guide tube is supported in the direction of impact on the first clutch disc or second clutch disc. The return spring acts in the direction of impact on the suspension and against the direction of impact on the second clutch disc. The guide tube can, but only with entrainment of at least one of the clutch discs, move in the direction of impact. The arranged between the suspension and the clutch discs return spring is compressed. The engagement of the guide tube can also take place between the two clutch discs, whereby the first clutch disc is lifted from the second clutch disc when looking up. The clutch is thus briefly released when looking up and the torque transmission is interrupted. Another embodiment engages directly on the return spring to use this to dampen the lookup of the blank.
Eine Ausgestaltung sieht vor, dass die Aufhängung einen mit dem Gehäuse starr verbundenen ersten Ring und einen das Führungsrohr umgreifenden zweiten Ring beinhaltet. Das Führungsrohr ist in dem zweiten Ring axial beweglich und der zweite Ring liegt in Schlagrichtung an dem ersten Ring an. Die Rückstellfeder kann an dem zweiten Ring anliegen.One embodiment provides that the suspension includes a first ring rigidly connected to the housing and a second ring encompassing the guide tube. The guide tube is axially movable in the second ring and the second ring abuts the first ring in the direction of impact. The return spring may rest against the second ring.
Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In der Figur zeigt:
-
Fig. 1 einen Bohrhammer.
-
Fig. 1 a hammer drill.
Eine Werkzeugaufnahme 5 hat Verriegelungselemente 6, welche den Bohrmeißel 2 in der Werkzeugaufnahme 5 gegen Herausfallen sichert und zugleich eine begrenzte Bewegung des Bohrmeißels 2 längs der Arbeitsachse 3 in der Werkzeugaufnahme 5 ermöglicht. Die Verriegelungselemente 6 sind komplementär zu dem Bohrmeißel 2 aufgebaut, hier beispielhaft in Form radial verschiebbarer Kugeln, welche in längs der Arbeitsachse geschlossene Verriegelungsnuten des Bohrmeißels 2 eingreifen können. Die Werkzeugaufnahme 5 hemmt ferner eine relative Drehbewegung des Bohrmeißels 2, z.B. durch radial vorspringende Drehmitnahmestege 7, die in entsprechende offene Drehmitnahmenuten des Bohrmeißels 2 eingreifen.A
Die Werkzeugaufnahme 5 haltert den Bohrmeißel 2 derart, dass ein Schlagwerk 9 auf eine rückseitige Stirnseite des Bohrmeißels 2 aufschlagen kann. Ferner ist die Werkzeugaufnahme 5 drehfest an einen Drehantrieb 10 angekoppelt, um ein von dem Drehantrieb 10 abgegebenes Drehmoment auf den Bohrmeißel 2 zu übertragen.The
Das Schlagwerk 9 ist beispielsweise ein pneumatisches Schlagwerk 9. Ein Erreger 11 und ein Schläger 12 sind in einem Führungsrohr 13 längs der Arbeitsachse 3 beweglich geführt. Der Erreger 11 ist über einen Exzenter 14 oder einen Taumelfinger an einen Motor 15 angekoppelt und zu einer periodischen, translatorischen Bewegung gezwungen. Eine Luftfeder gebildet durch eine pneumatische Kammer 16 zwischen Erreger 11 und Schläger 12 koppelt eine Bewegung des Schlägers 12 an die Bewegung des Erregers 11 an. Der Schläger 12 kann direkt auf ein hinteres Ende des Bohrmeißels 2 aufschlagen oder mittelbar über einen im Wesentlichen in dem Führungsrohr 13 ruhenden Zwischenschläger 17 (Döpper) einen Teil seines Impuls auf den Bohrmeißel 2 übertragen.The
Der Drehantrieb 10 hat beispielsweise eine Abtriebsspindel 18, welche lösbar oder unlösbar mit der Werkzeugaufnahme 5 drehstarr gekoppelt ist. Die Abtriebsspindel 18 kann beispielsweise eine hohle, das Schlagwerk 9 umgreifende Welle z.B. das Führungsrohr 13 sein. Die Abtriebsspindel 18 ist über einen Antriebsstrang mit dem Motor 15 gekoppelt. Der Antriebsstrang kann unter anderem ein ein- oder mehrstufiges Getriebe 20 und eine Drehmomentkupplung 21 enthalten. Die Drehmomentkupplung 21 ist insbesondere als Überlastschutz ausgebildet und unterbricht den Antriebstrang, falls ein von dem Motor 15 auf den Bohrmeißel 2 einwirkendes Drehmoment einen Grenzwert überschreitet.The
Der Motor 15, das Schlagwerk 9, und der Drehantrieb 10 sind vorzugsweise in einem Maschinengehäuse 22 angeordnet. Ein unlösbar mit dem Maschinengehäuse 22 verbundener Handgriff 23 ermöglicht dem Anwender den Bohrhammer 1 zu halten und führen. Ansprechend auf ein Betätigen von eines oder mehrerer Bedienelemente, z.B. eines Systemschalter 24 am Handgriff 23, wird der Motor 15 aktiviert und der Bohrhammer 1 in Betrieb genommen. Wahlschalter können beispielsweise selektiv das Schlagwerk 9 und/oder den Drehantrieb 10 im Betrieb zuschalten.The
Die beispielhafte Drehmomentkupplung 21 hat eine erste Kupplungsscheibe 25 und eine zweite Kupplungsscheibe 26, welche koaxial zu dem Führungsrohr 13 angeordnet sind. Die erste Kupplungsscheibe 25 kämmt mit dem Getriebe 20 und ist auf dem Führungsrohr 13 derart lose gelagert, dass sich die ersten Kupplungsscheibe 25 gegenüber dem Führungsrohr 13 drehen kann. Die zweite Kupplungsscheibe 26 kämmt über eine Verzahnung 27 mit dem Führungsrohr 13. Die beispielhaften Kupplungsscheiben 25, 26 haben ebene Stirnflächen, welche über Haftreibung aufeinander ein Drehmoment übertragen. Bei anderen Ausführungsformen ist die ersten Kupplungsscheibe 25 oder zweite Kupplungsscheibe 26 mit Nocken oder anderen in die gegenüberliegende Kupplungsscheibe eingreifenden Strukturen versehen sein. Die zweite Kupplungsscheibe 26 ist auf dem Führungsrohr 13 längs der Arbeitsachse 3 und relativ zu der ersten Kupplungsscheibe 25 verschiebbar. Die Drehmomentkupplung 21 ist geschlossen, wenn die beiden Kupplungsscheibe 25, 26 einander berühren und somit ein Drehmoment von dem Getriebe 20 auf das Führungsrohr 13 übertragen, ergo von dem Motor 15 auf die Werkzeugaufnahme 5. Eine Rückstellfeder 28 wirkt auf die bewegliche zweite Kupplungsscheibe 26 und schiebt diese in Richtung zu der ersten Kupplungsscheibe 25, hier beispielhaft entgegen der Schlagrichtung 4. Die Drehmomentkupplung 21 ist in ihrer Grundstellung geschlossen.The
Die ersten Kupplungsscheibe 25 liegt entgegen der Schlagrichtung 4 an einem radialen Vorsprung 29 des Führungsrohrs 13 an, welcher eine Bewegung der ersten Kupplungsscheibe 25 entgegen der Schlagrichtung 4 über diesen Vorsprung 29 hinaus hemmt. Der Vorsprung 29 kann beispielsweise einen auf das Führungsrohr 13 aufgesetzten Ring enthalten, welcher durch einen Sprengring axial an dem Führungsrohr 13 gesichert ist.The first
Das Führungsrohr 13 ist in dem Maschinengehäuse 22 längs der Arbeitsachse 3 verschiebbar aufgehängt. Bei einem Aufprall des Schlägers 12 oder des Döppers 17 auf die in Schlagrichtung 4 vorgesehen Anschläge 30, 31, kann das Führungsrohr 13 einen Teil der kinetischen Energie aufnehmen.The
Eine Aufhängung 32 des Führungsrohrs 13 am Maschinengehäuse 22 beinhaltet beispielsweise einen inneren Ring 33 und einen äußeren Ring 34. Der innere Ring 33 ist in den äußeren Ring 34 eingesetzt und in diesem um die Arbeitsachse 3 drehbar gelagert. Das Lager kann ein einfaches Gleitlager oder eine Walzenlager enthalten. Der äußere Ring 34 bildet für den inneren Ring 33 eine entgegen der Schlagrichtung 4 weisende Anschlagfläche 35 aus. Der beispielhafte äußere Ring 34 hat keine eine entgegen der Schlagrichtung 4 verlaufende Bewegung des inneren Rings 33 begrenzende Anschlagfläche. Das Führungsrohr 13 ist in den inneren Ring 33 eingesetzt. Der innere Ring 33 ist gegenüber dem Führungsrohr 13 axial beweglich. Der äußere Ring 34 ist an dem Maschinengehäuse 22 axial unbeweglich befestigt. Eine nicht dargestellte Ausführungsform sieht keine Trennung der Aufhängung 32 in die relativ zu einander drehbar angeordneten Ringe 33, 34 vor.A
Die Rückstellfeder 28 stützt sich in Schlagrichtung 4 an dem inneren Ring 33 der Aufhängung 32 ab. Bei einer axialen Bewegung des Führungsrohrs 13 in Schlagrichtung 4, erfolgt eine Krafteinleitung über den Vorsprung 29 in die axial gegenüber dem Maschinengehäuse 22 beweglichen Kupplungsscheiben 25, 26 durch die Rückstellfeder 28 und auf die zumindest in Schlagrichtung 4 gegenüber dem Maschinengehäuse 22 unbewegliche Aufhängung 32. Die Rückstellfeder 28 wird dabei komprimiert.The
Die Rückstellfeder 28 liegt an einer in Schlagrichtung 4 weisenden Fläche 36 der zweite Kupplungsscheibe 26 und an einer entgegen der Schlagrichtung 4 weisenden Fläche 37 des inneren Rings 33 an.The
Sofern das Führungsrohr 13 über weitere Aufhängungen an dem Maschinengehäuse 22 gelagert ist, erlauben diese sämtlich eine relative Bewegung des Führungsrohrs 13 gegenüber dem Maschinengehäuse 22 längs der Arbeitsachse 3. If the
Das Getriebe 20 hat ein Hohlrad 38 mit einer Innenverzahnung. Das Hohlrad 38 ist koaxial zu der ersten Kupplungsscheibe 25 angeordnet und kämmt mit einer Außenverzahnung der ersten Kupplungsscheibe 25. The
Eine weitere Ausführungsform sieht vor, dass die zweite Kupplungsscheibe 26 berührend an dem radialen Vorsprung 29 anliegt. Der radiale Vorsprung 29 ist zwischen den beiden Kupplungsscheiben 25, 26 angeordnet. Eine Krafteinleitung des bewegten Führungsrohrs 13 erfolgt unter Auslassen der ersten Kupplungsscheibe 25. Das bewegte Führungsrohr 13 trennt die beiden Kupplungsscheiben längs der Arbeitsachse 3 und öffnet somit die Drehmomentkupplung 21. Bei dieser Ausgestaltung kann die ersten Kupplungsscheibe 25 gegenüber dem Maschinengehäuse 22 längs der Arbeitsachse 3 unbeweglich angeordnet sein.A further embodiment provides that the second
Claims (5)
einem Gehäuse,
einem Schlagwerk (9), das einen in einem Führungsrohr (13) längs einer Arbeitsachse (3) beweglich geführten Schläger (12) hat,
einer an dem Gehäuse (22) befestigten Aufhängung (32), in der das Führungsrohr (13) längs der Arbeitsachse (3) beweglich gelagert ist,
einer Drehmomentkupplung (21), die auf dem Führungsrohr (13) gelagert und in Schlagrichtung (4) an der Aufhängung (32) abgestützt ist und wobei das Führungsrohr (13) an der Drehmomentkupplung (21) in Schlagrichtung (4) abgestützt ist.Hand tool with
a housing,
an impact mechanism (9) having a racket (12) movably guided in a guide tube (13) along a working axis (3),
a suspension (32) attached to the housing (22), in which the guide tube (13) is movably mounted along the working axis (3),
a torque coupling (21) mounted on the guide tube (13) and supported in the direction of impact (4) on the suspension (32) and wherein the guide tube (13) on the torque coupling (21) in the direction of impact (4) is supported.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011081617A DE102011081617A1 (en) | 2011-08-26 | 2011-08-26 | Hand-held machine tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2561962A1 true EP2561962A1 (en) | 2013-02-27 |
EP2561962B1 EP2561962B1 (en) | 2017-01-18 |
Family
ID=46466317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12175665.4A Active EP2561962B1 (en) | 2011-08-26 | 2012-07-10 | Hand-held tool machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US9789598B2 (en) |
EP (1) | EP2561962B1 (en) |
CN (1) | CN102950580B (en) |
DE (1) | DE102011081617A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009027223B4 (en) * | 2009-06-26 | 2022-01-13 | Robert Bosch Gmbh | Hand-held power tool with ratchet mechanism |
CN104227666A (en) * | 2013-06-20 | 2014-12-24 | 苏州宝时得电动工具有限公司 | Electric hammer |
EP2842696B1 (en) * | 2013-08-30 | 2016-06-01 | HILTI Aktiengesellschaft | Power tool |
EP3023200A1 (en) * | 2014-11-20 | 2016-05-25 | HILTI Aktiengesellschaft | Control method for a hammer drill |
US10850381B2 (en) * | 2016-05-18 | 2020-12-01 | Makita Corporation | Impact tool |
Citations (5)
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US5111890A (en) * | 1988-08-02 | 1992-05-12 | Robert Bosch Gmbh | Hammer drill |
DE19933972A1 (en) * | 1999-07-20 | 2001-01-25 | Bosch Gmbh Robert | Hammer drill or hammer |
EP1157788A2 (en) * | 2000-04-07 | 2001-11-28 | Black & Decker Inc. | Rotary hammer mode change mechanism |
DE102004047470A1 (en) * | 2004-09-30 | 2006-04-06 | Robert Bosch Gmbh | Hand tool, in particular drill and / or percussion hammer |
EP2314420A1 (en) * | 2009-10-21 | 2011-04-27 | Metabowerke GmbH | Motor driven tool device with hammer drill operation mode |
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DE2252951B2 (en) * | 1972-10-28 | 1981-09-10 | Robert Bosch Gmbh, 7000 Stuttgart | Hammer drill |
SU755543A1 (en) * | 1977-04-26 | 1980-08-15 | Vni Pk I Mekh | Percussion-type nut wrench |
US4229981A (en) * | 1978-09-18 | 1980-10-28 | Milwaukee Electric Tool Corporation | Reversible hammer drill |
US4285422A (en) * | 1979-06-25 | 1981-08-25 | Bentley Arthur P | Centrifugally operated clutch and variable ratio torque multiplier |
DE4215288A1 (en) * | 1991-07-08 | 1993-01-14 | Bosch Gmbh Robert | DRILLING HAMMER |
US5366412A (en) * | 1992-05-19 | 1994-11-22 | Implant Innovations, Inc. | Torque limiting clutch and its uses |
US5588496A (en) * | 1994-07-14 | 1996-12-31 | Milwaukee Electric Tool Corporation | Slip clutch arrangement for power tool |
US5538089A (en) * | 1995-06-05 | 1996-07-23 | The Black & Decker Corporation | Power tool clutch assembly |
US5954140A (en) * | 1997-06-18 | 1999-09-21 | Milwaukee Electric Tool Corporation | Rotary hammer with improved pneumatic drive system |
DE10021355B4 (en) * | 2000-05-02 | 2005-04-28 | Hilti Ag | Beating electric hand tool with vibration-decoupled assemblies |
DE10205030A1 (en) * | 2002-02-07 | 2003-08-21 | Hilti Ag | Operating mode switching unit of a hand machine tool |
AU2003259557A1 (en) * | 2002-08-27 | 2004-03-19 | Matsushita Electric Works, Ltd. | Electrically operated vibrating drill/driver |
GB2394516A (en) * | 2002-10-23 | 2004-04-28 | Black & Decker Inc | Power tool |
GB2394517A (en) * | 2002-10-23 | 2004-04-28 | Black & Decker Inc | Powered hammer having a spindle lock with synchronising element |
DE602004026134D1 (en) * | 2003-04-01 | 2010-05-06 | Makita Corp | power tool |
DE102004044499B4 (en) * | 2004-09-15 | 2021-02-18 | Robert Bosch Gmbh | Hand machine tool, in particular drill and / or percussion hammer |
US7410007B2 (en) * | 2005-09-13 | 2008-08-12 | Eastway Fair Company Limited | Impact rotary tool with drill mode |
DE102006000252A1 (en) * | 2006-05-30 | 2007-12-06 | Hilti Ag | Hand tool with slip clutch |
FI122703B (en) * | 2006-12-14 | 2012-05-31 | Foster Wheeler Energia Oy | Shaking device for a surface that is soiled |
US7832498B2 (en) * | 2007-06-15 | 2010-11-16 | Makita Corporation | Impact tool |
US7806201B2 (en) * | 2007-07-24 | 2010-10-05 | Makita Corporation | Power tool with dynamic vibration damping |
CL2008002367A1 (en) * | 2007-08-13 | 2009-01-02 | Russell Mineral Equipment Pty Ltd | Hammer without pneumatically operated retroimpact comprising a first housing, a chisel head and a piston mechanism arranged in a tube, with low pressure air intake means and high pressure air intake means that allow the movement of the piston. |
DE102007050307A1 (en) * | 2007-10-22 | 2009-04-23 | Robert Bosch Gmbh | Hand tool |
DE102007056531A1 (en) * | 2007-11-23 | 2009-05-28 | Hilti Aktiengesellschaft | Hand tool machine with impact tool holder and associated tool |
US8875804B2 (en) * | 2010-01-07 | 2014-11-04 | Black & Decker Inc. | Screwdriving tool having a driving tool with a removable contact trip assembly |
DE102010044011A1 (en) * | 2010-11-16 | 2012-05-16 | Hilti Aktiengesellschaft | Hand tool |
-
2011
- 2011-08-26 DE DE102011081617A patent/DE102011081617A1/en not_active Ceased
-
2012
- 2012-07-10 EP EP12175665.4A patent/EP2561962B1/en active Active
- 2012-08-21 CN CN201210298141.7A patent/CN102950580B/en active Active
- 2012-08-24 US US13/594,655 patent/US9789598B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US5111890A (en) * | 1988-08-02 | 1992-05-12 | Robert Bosch Gmbh | Hammer drill |
DE19933972A1 (en) * | 1999-07-20 | 2001-01-25 | Bosch Gmbh Robert | Hammer drill or hammer |
EP1157788A2 (en) * | 2000-04-07 | 2001-11-28 | Black & Decker Inc. | Rotary hammer mode change mechanism |
DE102004047470A1 (en) * | 2004-09-30 | 2006-04-06 | Robert Bosch Gmbh | Hand tool, in particular drill and / or percussion hammer |
EP2314420A1 (en) * | 2009-10-21 | 2011-04-27 | Metabowerke GmbH | Motor driven tool device with hammer drill operation mode |
Also Published As
Publication number | Publication date |
---|---|
CN102950580B (en) | 2016-12-07 |
CN102950580A (en) | 2013-03-06 |
US9789598B2 (en) | 2017-10-17 |
US20130220658A1 (en) | 2013-08-29 |
DE102011081617A1 (en) | 2013-02-28 |
EP2561962B1 (en) | 2017-01-18 |
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