EP2457694B1 - Power tool - Google Patents
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- EP2457694B1 EP2457694B1 EP11188467.2A EP11188467A EP2457694B1 EP 2457694 B1 EP2457694 B1 EP 2457694B1 EP 11188467 A EP11188467 A EP 11188467A EP 2457694 B1 EP2457694 B1 EP 2457694B1
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- European Patent Office
- Prior art keywords
- mass
- spring
- machine tool
- additional mass
- striking
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- 230000007246 mechanism Effects 0.000 claims description 44
- 230000003044 adaptive effect Effects 0.000 description 24
- 238000011161 development Methods 0.000 description 11
- 230000018109 developmental process Effects 0.000 description 11
- 230000009471 action Effects 0.000 description 9
- 230000008901 benefit Effects 0.000 description 7
- 230000006978 adaptation Effects 0.000 description 6
- 230000035559 beat frequency Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000009527 percussion Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
- B25B21/026—Impact clutches
Definitions
- the invention relates to a hand tool according to the preamble of claim 1.
- a mechanical Tangentialtschtechnik as in the power tool of the type mentioned, for example, in an impact wrench allows comparatively large torques of the tool holder to provide, with only a comparatively small counter-torque required. This is for example when tightening screw or the setting of screw anchors in particularly solid ground advantage.
- the tip torque which can be provided by the tangential impactor can far exceed a continuous torque that can be set by the drive of the handheld power tool.
- the lowest possible counter-torque is of particular advantage to the user, since he usually has to provide the counter-torque on the handle of the hand-held power tool, such as an impact wrench. The lower the counter-torque, the easier it will be to handle the power tool.
- a comparatively low holding torque is particularly desirable, as this is a major advantage of a percussive impact wrench, z. B. compared to a conventional screwdriver represents.
- a percussive impact wrench z. B. compared to a conventional screwdriver represents.
- a hand tool according to the preamble of claim 1 is made DE 11 96 587 known.
- the invention begins, the object of which is to provide a hand tool machine in which an applicable torque range can be adapted in an improved manner.
- an adaptation of a tangential impact mechanism should be implemented in an improved manner.
- an adapted torque range should result in an overall increased applicable torque range.
- the task relating to the power tool is achieved by a hand tool of the type mentioned, in the present invention, the features of the characterizing part of claim 1 are provided.
- the tangential impact additionally provides an additional mass available that is releasably coupled to the main mass and is under the action of a second spring.
- the additional mass is composed of the sum of the main mass and additional mass. This increases, if necessary, the deliverable torque of the tangential impact according to the concept of the invention.
- the concept of the invention also provides that the additional mass is under the action of a second spring.
- the concept of the invention also has the advantage that due to the largely constant beat frequency when adapting the tangential impact mechanism, an engine speed can also remain relatively constant. This advantageously allows an improved design of the drive both to a first operating state with only the main mass as a hammer and to a second operating state with increased Total mass of the hammer. At most, in the case of using an unregulated motor to drive the power tool when adapting the Tangentialzzitechniks the same speed due to the load also adapt.
- the power tool in the context of a particularly advantageous development of the power tool, it can thus be operated in a first and a second operating state, it being possible to switch back and forth as required between the operating states mentioned.
- a first operating state the main mass of the hammer and the anvil are axially movable under the action of force of a first spring and, while twisting the same, against each other tangentially against one another.
- a second operating state the main mass and the additional mass of the hammer and anvil under the action of force of the first and second spring axially and while rotating the same against each other tangentially hitting against each other movable.
- the additional mass can be detachably coupled to the main mass by means of a feed mechanism.
- the feed mechanism advantageously has a preloaded second spring acting on the additional mass.
- the feed mechanism is advantageous to operate by the user of the power tool, so that can be switched during operation of the power tool by pressing the feed mechanism between the first and second operating state.
- the feed mechanism is movable along a control link.
- the delivery mechanism may be movable by a user.
- the feed mechanism is axially displaceable along a control link.
- the delivery mechanism may also be rotatable along a control link. Both are possible alone and in combination, for example, to switch between the aforementioned first operating and second operating state of the power tool.
- the main mass and the additional mass are positively coupled to one another in a second operating state.
- This has proven to be a comparatively simple mechanism for increasing the overall mass of the hammer.
- the feed mechanism has a housing cage, in which said second spring is biased against the additional mass and the housing cage.
- a housing cage is advantageous as a whole freely or according to a control link movable.
- the feed mechanism thus has an intrinsically compact form which is safe to operate.
- the feed mechanism is secured in a first operating state of a securing element against movement.
- a securing element advantageously serves to prevent unintentional actuation of the feed mechanism.
- a securing element can be designed to secure the feed mechanism for operation of the handheld power tool both in the first operating state and in a second operating state.
- a securing element may be designed as a lever lock or the like against whose resistance the feed mechanism is to be actuated or which is also to be actuated by the user before actuation of the feed mechanism.
- the tangential impact mechanism with a structurally suitable force-transmitting impact gear which acts on the hammer and / or the anvil.
- a striking mechanism is advantageously used to move the hammer and / or anvil axially against one another according to a control contour and while twisting the same against each other tangentially.
- Hammer and / or anvil advantageously each have a striking surface over which a Tangentialschlag is transferable to transmit a peak torque between the hammer and anvil.
- the percussion gear can be formed in the form of a slotted guide with a thread-like control contour, which is formed on a spindle coupling the drive and the hammer.
- a percussion gear may also be in the form of a knob arrangement with a slanted control contour formed on a cam and anvil coupling cam.
- Other forms of impact gear are possible and not limited to the aforementioned advantageous developments.
- the additional mass has a striking surface, which is coupled in the coupling Condition of additional mass and main mass extends axially equal to or beyond an extension of the main mass.
- the impact surface of the additional mass alone or additionally formed to strike against an anvil impact surface for transmitting a Tangentialschlag. This can be used to a larger-scale design of the face of the additional mass and thus lower stress of the additional mass in carrying out the tangential impact.
- the main mass has a striking surface which extends axially beyond an extension of the additional mass in the coupled state of additional mass and main mass.
- the striking surface of the main mass is designed solely to strike against an anvil striking surface.
- This second variant can advantageously be used to make the striking surfaces, in particular the anvil striking surface comparatively small. This can be used to advantage in reducing the total mass of the tangential impactor.
- Fig. 2A and Fig. 2B schematically show the operation of an adaptive tangential impactor 10, wherein Fig. 2A the adaptive tangential impactor 10 in a first operating state and Fig. 2B shows the adaptive tangential impactor 10 in a second mode of operation.
- the adaptive tangential impact mechanism 10 which for the sake of simplicity is also referred to as a tangential striking mechanism, has an anvil 60 assigned to the drive shaft 30 and a hammer 70 assigned to the drive 104 Fig. 2A
- the hammer 70 is merely shown with its main mass 71.
- the main mass 71 of the hammer 70 is movable axially against the anvil 60 solely under the action of a first external spring 81 and tangentially striking the anvil 60 while the main mass 71 is rotated.
- the first - outboard - spring 81 is part of a in Fig. 2B
- the first, outer spring 81 is supported against a fixed stop 83 and is biased in this manner against the main mass 71 of the hammer 70.
- the first outer spring 81 has a first spring constant K1, which is achieved by means of its rigidity.
- the main mass 71 of the hammer 70 has a weight designated M1.
- the adaptive tangential impactor 10 may also be used in a second in accordance with the concept of the invention Fig. 2B shown operating state in which increases the deliverable torque and yet the natural frequency of the spring-mass system of hammer 70 and spring system 80 is kept substantially constant.
- an additional mass 72 is additionally positively coupled to the main mass 71 of the hammer 70.
- the weight of the additional mass 72 is referred to herein as M2.
- the total mass of the hammer 70 is thus in the second in Fig. 2B shown operating state M1 + M2.
- the equipped with this total mass hammer 70 is under the action of force of the spring system 80, which now in addition to the first, outer spring 81 has a second - extending within the outer spring spring 82.
- the spring constant K2 of the second spring 82 is determined by its rigidity and may be greater or smaller than the stiffness of the first spring 81.
- a spring constant K2 - as well as the mass M2 of the additional mass 72 - be designed to a natural frequency of the spring Mass system of hammer 70 and spring system 80 in the second operating state in comparison to the first operating state to keep largely the same.
- Both springs 81, 82 are in turn supported against the stop 83.
- second operating state is the sum of the weights of the main mass 7 and additional mass 71, 71 of the hammer 70 under the action of the first and second spring 81, 82, so that the hammer 70 is axially and while twisting the same against the anvil 60 tangentially striking movable.
- the hammer 70 has - in this case shown symbolically on the main mass 71 - hammer cam 73, which are provided for abutment with this also associated symbolically anvil cam 63.
- a hammer cam 73 has a face 74 transverse to the circumferential direction of the hammer 70.
- an anvil cam 63 may have a face 64, which is set transversely to the circumferential direction and is associated with the striking surface 74.
- the striking surface can also be formed directly on the body of the anvil 60.
- the axial and twisting movement of the hammer 70 is realized in the present case by a percussion gear in the form of a not shown in detail slotted guide on the spindle 20.
- the slotted guide has a thread-like control contour which forcibly guides the hammer 70 with main mass 71 and 72 to a rotary movement under axial feed to the anvil 60, the movement being driven by the spring system 80.
- Fig. 3A, Fig. 3B show - in each case in a cross section I and an axial section II already Fig. 2A, Fig. 2B explained operating states of a Tangentialtschtechniks 10A according to a particularly preferred first embodiment of the first further developing variant of the invention.
- FIGS. 2A and 2B For identical or similar parts or parts of identical or similar function, in the present case the same reference numerals as in FIG FIGS. 2A and 2B used.
- the mode of operation of the first variant of the adaptive tangential impact device 10A corresponds to the mode of operation as described with reference to FIG Fig. 2A, Fig. 2B was explained. In the following, reference is made in particular to the structural details of the tangential impact mechanism 10A and remainder to the description of the Fig. 2A, Fig. 2B directed.
- the tangential impactor 10A is in the in Fig. 3A shown first operating mode operated only with the main mass 71, which is under the action of force only the first spring 81 and is moved axially and with rotation of the main mass 71 tangentially striking against the anvil 60.
- the corresponding cam 73 of the main mass 71 is in the cross-sectional view I of Fig.
- the moment of inertia of the main mass 71 in the present case is about I 1 40 000 gmm 2 .
- the moment of inertia of the additional mass 72 in the present case is about I 2 100 000 gmm 2 .
- the spring stiffness K1 of the first spring 81 is presently about 11 kN / m.
- the spring stiffness K2 of the second spring 82 is present at 36 kN / m. Im in Fig. 3B shown second state, add the weights M1, M2 of the main mass 71 and the additional mass 72 to the total weight M1 + M2 of the hammer 70.
- the spring stiffnesses K1, K2 of the first and second spring add up to a total spring stiffness K1, K2 of the spring system 80th the likewise adding moments of inertia I 1 , I 2 , the adaptive tangential impactor 10 A in the second operating state of the Fig. 3B a significantly increased transmissible torque.
- the resonantly operable natural frequency of the spring-mass system of the adaptive tangential impactor 10A in the second operating state largely corresponds to that of the first operating state.
- An effectively selectable beat frequency of the tangential impactor 10A thus remains largely the same although the transmittable torque is increased.
- a housing frame 90 which is displaceable along the spindle 20 and rotatably mounted is realized.
- the housing cage 90 is freely axially displaceable and rotatably mounted along a control link, not shown. That is, by rotating or moving the fixed to the housing cage and the housing 101 of the power tool 100 by cross-wheel 91 can be actuated the delivery mechanism as soon as the unintentional actuation preventing securing elements 92 are unlocked.
- the securing elements 92 are formed in the form of tilting levers against the housing cage 90.
- the housing cage 90 can be rotated or displaced beyond the resistance of the rocker arms.
- the tilting levers attached to a housing 101 of the portable power tool are pushed away from the steering wheel 91 toward the housing.
- the first spring 81 here supports an inner spring and against a stop 83.1 fastened to the spindle 20 and prestressed against the main mass 71.
- the second spring 82 is here an outer spring and supported against a formed by the rear wall of the rear housing cage 90 stop 83.2 and biased against the additional mass 72.
- the annular designed main mass 71 and additional mass 72 are present in any case partially concentric with each other.
- the additional mass 72 surrounds the main mass annularly and positively in the second operating state, while the main mass 71 is guided by a control contour of a slotted guide on the spindle 20.
- the tangential impact mechanism 10A is fastened to the housing 101 of the handheld power tool 100 with screw connections 107.
- the screw connections 107 hold a bearing block 108, which on the drive side comprises the bearings 109 for the spindle 20.
- the additional mass 72 has a cross-sectional view I of FIG Fig. 3B apparent striking surface 74 on a hammer cam 75 thereof, which extends in the coupled state of additional mass 72 and main mass 71 over an axial extent of the main mass 71 axially out or - in a modification - can extend to the same height thereof.
- at least the striking surface 74 of the additional mass 72 serves - in a modification by the striking surface of the main mass 71 - for abutment against an anvil striking surface on an anvil cam 63.
- Both the main mass 71 and the additional mass 72 can therefore have suitable cams 73 with impact surface 74 for the execution of a tangential impact on the anvil 60.
- the striking surface 74 may be formed by a cam 75 of the additional mass 72 or - in the modification - both by a cam 73 of the main mass and by a cam 75 of the additional mass 72. Especially in the latter case increases the total available impact surface 74 for tangential impact on the anvil 60 so that the tangential impact torque distribution is distributed over a relatively large area. This ultimately leads to less wear of the cams 73, 75 on the main mass 71 and additional mass 72.
- the face of the cam 75 of the additional mass 72 projects slightly relative to the cam 73 of the main mass, so that only the cam 75 of the additional mass 72 has contact with the anvil 60 during tangential impact.
- the main mass 71 and the additional mass 72 are positively connected to each other by the described feed mechanism.
- Both the main mass and the additional mass 72 and the first spring 81 and the second spring 82 are available for torque transmission at the tangential 10 A in Fig. 3B shown second operating mode available. Accordingly, the deliverable torque increases in the adaptive tangential impactor 10A. Due to the second spring 82, the release torque of the tangential impactor is also increased. However, this holds in a relatively limited range, so that the handling of a hand tool 100 with the adaptive tangential impactor 10 is practically not affected.
- FIGS. 3A and 3B show a second embodiment of an adaptive tangential impactor 10B in one FIGS. 3A and 3B analog representation.
- identical reference numerals are used herein for identical or similar parts or parts of identical or similar function.
- the design of the adaptive tangential impactor 10B is broadly similar to that of the adaptive tangential impactor 10A. In the following, only the differences between the two tangential impact devices are referred to. The essential difference is by comparison of the cross-sectional representation I in FIGS. 4A and 4B recognizable.
- the main mass 71 has a striking surface 74 or a cam 73 which is exclusively-that is to say in FIG Fig. 4A shown first operating state as well as in Fig. 4B shown second operating state - Contact with the anvil 60 has Tangentialschlag.
- the concentric and form-fitting coupled to each other main mass and additional mass 71, 72 to form the hammer 70 only with the two cams 73 of the main mass 71 are equipped.
- the additional mass 72 has no cams.
- the impact surfaces of the anvil 60 can thereby be carried out to a lesser extent.
- the entire spring-mass system of the adaptive percussion mechanism 10B can be made smaller in mass.
- the additional mass 72 thus has a lower weight than the main mass. Accordingly, the moment of inertia difference between the main mass and the additional mass is not as great as in the adaptive tangential impactor 10A.
- the spring stiffness for forming the spring constant K1 of the first spring is selected here with 11 KN / m.
- the spring stiffness for forming the spring constant K2 of the second spring is presently formed with 24 KN / m.
- the second spring constant K2 in the spring system is thus greater than the first spring constant K1.
- the preferred impact frequency of the tangential impactor 10A, 10B, that is the natural frequency of the total spring-mass system, in the first and second operating state is approximately equal.
- Fig. 5 shows on an equal scale the torque peaks transmitted between hammer 70 and anvil 60 over an equal period of time in an adaptive tangential impactor 10A or 10B.
- view A it can be seen that an average amount of transmitted torque peak in the first operating state corresponds to only about half of an average amount of a torque peak in the second operating state.
- the first operating state only the main mass 71 of the hammer 70 is moved tangentially striking the anvil 60 under the force of the first spring 81 while twisting it.
- both the main mass 71 and the additional mass 72 of the hammer 70 are moved axially against the anvil 60 by twisting the first and second springs 81, 82, while twisting the same.
- the illustrations also show that the beat frequency of an adaptive tangential impactor 10A, 10B is substantially equal and fairly constant in the first and second modes of operation.
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Description
Die Erfindung betrifft eine Handwerkzeugmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.
Ein mechanisches Tangentialschlagwerk wie bei der Handwerkzeugmaschine der eingangs genannten Art, beispielsweise bei einem Schlagschrauber, erlaubt es vergleichsweise große Drehmomente der Werkzeugaufnahme zur Verfügung zu stellen, wobei nur ein vergleichsweise geringes Gegenmoment erforderlich. Dies ist beispielsweise beim Festziehen von Schraubverbindungen oder dem Setzen von Schraubankern in besonders festem Untergrund von Vorteil. Insbesondere kann gegebenenfalls bei solchen Anwendungen das vom Tangentialschlagwerk zur Verfügung stellbare Spitzendrehmoment weit über einem kontinuierlichen Drehmoment liegen, das vom Antrieb der Handwerkzeugmaschine zur Verfügung stellbar ist. Ein möglichst geringes Gegenmoment ist vor allem für die Anwender von Vorteil, da dieser das Gegenmoment üblicherweise am Handgriff der Handwerkzeugmaschine, wie beispielsweise eines Schlagschraubers, zur Verfügung stellen muss. Je geringer das Gegenmoment ist, desto einfacher wird die Handhabung der Handwerkzeugmaschine.A mechanical Tangentialschlagwerk as in the power tool of the type mentioned, for example, in an impact wrench allows comparatively large torques of the tool holder to provide, with only a comparatively small counter-torque required. This is for example when tightening screw or the setting of screw anchors in particularly solid ground advantage. In particular, in such applications, if appropriate, the tip torque which can be provided by the tangential impactor can far exceed a continuous torque that can be set by the drive of the handheld power tool. The lowest possible counter-torque is of particular advantage to the user, since he usually has to provide the counter-torque on the handle of the hand-held power tool, such as an impact wrench. The lower the counter-torque, the easier it will be to handle the power tool.
Meist sind Tangentialschlagwerke im Rahmen eines Feder-Masse-Systems auf einen resonanten Betrieb desselben ausgelegt, was überlicherweise den effektiven Betrieb auf einen vergleichsweise begrenzten Drehmomentbereich beschränkt. Letztlich ist der eigentliche Betriebspunkt der Handwerkzeugmaschine in dem vergleichsweise eng begrenzten Drehmomentbereich durch die Antriebsdrehzahl des Antriebs der Handwerkzeugmaschine festgelegt.Most tangential impact are designed as part of a spring-mass system to a resonant operation thereof, which usually limits the effective operation to a relatively limited torque range. Ultimately, the actual operating point of the power tool in the comparatively narrow torque range is determined by the drive speed of the drive of the power tool.
Wünschenswert ist es, unter Erhalt der vorgenannten Aspekte einen möglichst großen Drehmomentbereich zu erreichen, in dem ein Betrieb der Handwerkzeugmaschine effektiv möglich ist. Es hat sich gezeigt, dass zu diesem Zweck ein Tangentialschlagwerk der Handwerkzeugmaschine - ähnlich wie ein Feder-Masse-System - für einen resonanten Betrieb adaptierbar ist. Beispielsweise ist aus
Problematisch bei einer Anpassung eines Tangentialschlagwerks - das grundsätzlich ähnlich wie eine Rutschkupplung der
Eine Handwerkzeugmaschine gemäß dem Oberbegriff von Anspruch 1 ist aus
An dieser Stelle setzt die Erfindung an, deren Aufgabe es ist, eine Handwerkzeugmaschine anzugeben, bei der ein anwendbarer Drehmomentbereich in verbesserter Weise adaptierbar ist Insbesondere soll eine Adaption eines Tangentialschlagwerks in verbesserter Weise realisiert sein. Besonders vorteilhaft soll ein adaptierter Drehmomentbereich zu einem insgesamt vergrößerten anwendbaren Drehmomentbereich führen.At this point, the invention begins, the object of which is to provide a hand tool machine in which an applicable torque range can be adapted in an improved manner. In particular, an adaptation of a tangential impact mechanism should be implemented in an improved manner. Especially advantageous an adapted torque range should result in an overall increased applicable torque range.
Die Aufgabe betreffend die Handwerkzeugmaschine wird durch eine Handwerkzeugmaschine der eingangs genannten Art gelöst, bei der erfindungsgemäß die Merkmale des kennzeichnenden Teils des Anspruchs 1 vorgesehen sind. Erfindungsgemäß weist der Hammer des Tangentialschlagwerks eine Hauptmasse auf, wobei das Tangentialschlagwerk zusätzlich eine Zusatzmasse zur Verfügung stellt, die an die Hauptmasse lösbar koppelbar ist und unter Krafteinwirkung einer zweiten Feder steht. Durch Ankoppeln der Zusatzmasse an die Hauptmasse wird also ein Hammer zur Verfügung gestellt, dessen Gesamtmasse sich als Summe der Hauptmasse und Zusatzmasse zusammensetzt. Dies erhöht bei Bedarf das abgebbare Drehmoment des Tangentialschlagwerks gemäß dem Konzept der Erfindung. Darüber hinaus sieht das Konzept der Erfindung auch vor, dass die Zusatzmasse unter Krafteinwirkung einer zweiten Feder steht. Auf diese Weise wird neben der Gesamtmasse des Hammers auch eine Gesamtederkraft erhöht unter dessen Krafteinwirkung das Feder-Masse-System des Tangentialschlagwerks steht. Dadurch wird die Schlagfrequenz des Tangentialschlagwerks in Betriebszuständen mit erhöhter Gesamtmasse aus Hauptmasse und Zusatzmasse bei erhöhter Gesamtfederkraft und auch in anderen Betriebszuständen, bei denen nur eine Hauptmasse unter Einwirkung der ersten Feder steht, gleicht gehalten. Während also durch das Konzept der Erfindung das abgebbare Drehmoment des Tangentialschlagwerks adaptiert, insbesondere im zweiten Betriebszustand mit erhöhter Gesamtmasse des Hammers vorteilhaft erhöht ist, geht diese dennoch in vergleichsweise geringer Weise zu Lasten eines erhöhten Auslösemoments des Tangentialschlagwerks. Ein Haltemoment des Anwenders ist also trotz Erhöhung bzw. Adaption des abgegebenen Drehmoments vergleichsweise gering gehalten. Ursache dafür ist, dass eine Erhöhung einer Federkraft für das Tangentialschlagwerk gemäß dem Konzept der Erfindung aufgrund der erhöhten Gesamtmasse im zweiten Betriebszustand vergleichsweise gering ausfallen kann. Vorteilhaft wird ein Anwender somit bei Adaption des Tangentialschlagwerks kaum ein verändertes Haltemoment bei der Anwendung der Handwerkzeugmaschine feststellen. Dennoch wird ein Anwender in der Lage sein, das abgebbare Drehmoment der Handwerkzeugmaschine auf die erforderlichen Bearbeitungsumgebungen anzupassen.The task relating to the power tool is achieved by a hand tool of the type mentioned, in the present invention, the features of the characterizing part of claim 1 are provided. According to the hammer of Tangentialschlagwerks on a main mass, the tangential impact additionally provides an additional mass available that is releasably coupled to the main mass and is under the action of a second spring. By coupling the additional mass to the main mass so a hammer is provided, the total mass is composed of the sum of the main mass and additional mass. This increases, if necessary, the deliverable torque of the tangential impact according to the concept of the invention. In addition, the concept of the invention also provides that the additional mass is under the action of a second spring. In this way, in addition to the total mass of the hammer and a total spring force is increased under the force of the spring-mass system of Tangentialschlagwerks stands. As a result, the frequency of impact of the Tangentialschlagwerks in operating conditions with increased total mass of main mass and additional mass at increased total spring force and in other operating conditions, in which only one main mass is under the action of the first spring, kept the same. Thus, while adapted by the concept of the invention, the deliverable torque of the tangential impact, especially in the second operating state with increased total mass of the hammer is advantageously increased, this is nevertheless in a comparatively small way at the expense of increased triggering torque of Tangentialschlagwerks. A holding torque of the user is thus kept relatively low despite increase or adaptation of the delivered torque. The reason for this is that an increase in a spring force for the tangential impact mechanism according to the concept of the invention can be comparatively low due to the increased total mass in the second operating state. Advantageously, a user will thus hardly notice an altered holding torque during the adaptation of the tangential impact mechanism when using the handheld power tool. Nevertheless, a user will be able to adjust the deliverable torque of the hand tool to the required machining environments.
Mit dem Konzept der Erfindung ist auch der Vorteil verbunden, dass aufgrund der weitgehend gleich gehaltenen Schlagfrequenz bei Adaption des Tangentialschlagwerks eine Motordrehzahl ebenfalls vergleichsweise gleich bleiben kann. Dies erlaubt vorteilhaft eine verbesserte Auslegung des Antriebs sowohl auf einen ersten Betriebszustand mit lediglich der Hauptmasse als Hammer als auch auf einen zweiten Betriebszustand mit erhöhter Gesamtmasse des Hammers. Allenfalls mag im Falle der Verwendung eines ungeregelten Motors zum Antrieb der Handwerkzeugmaschine bei Adaption des Tangentialschlagwerks sich die Drehzahl desselben lastbedingt ebenfalls anpassen.The concept of the invention also has the advantage that due to the largely constant beat frequency when adapting the tangential impact mechanism, an engine speed can also remain relatively constant. This advantageously allows an improved design of the drive both to a first operating state with only the main mass as a hammer and to a second operating state with increased Total mass of the hammer. At most, in the case of using an unregulated motor to drive the power tool when adapting the Tangentialschlagwerks the same speed due to the load also adapt.
Im Rahmen einer besonders vorteilhaften Weiterbildung der Handwerkzeugmaschine lässt sich diese somit in einem ersten und einem zweiten Betriebszustand betreiben, wobei zwischen den genannten Betriebszuständen je nach Bedarf hin und her geschaltet werden kann. Vorteilhaft ist in einem ersten Betriebszustand die Hauptmasse des Hammers und der Amboss allein unter Krafteinwirkung einer ersten Feder axial und unter Verdrehen derselben gegeneinander tangential schlagend gegeneinander bewegbar. Vorteilhaft sind in einem zweiten Betriebszustand die Hauptmasse und die Zusatzmasse des Hammers und Amboss unter Krafteinwirkung der ersten und zweiten Feder axial und unter Verdrehen derselben gegeneinander tangential schlagend gegeneinander bewegbar.In the context of a particularly advantageous development of the power tool, it can thus be operated in a first and a second operating state, it being possible to switch back and forth as required between the operating states mentioned. Advantageously, in a first operating state, the main mass of the hammer and the anvil are axially movable under the action of force of a first spring and, while twisting the same, against each other tangentially against one another. Advantageously, in a second operating state, the main mass and the additional mass of the hammer and anvil under the action of force of the first and second spring axially and while rotating the same against each other tangentially hitting against each other movable.
In einer besonders bevorzugten konstruktiven Weiterbildung des Konzepts der Erfindung ist vorgesehen, dass die Zusatzmasse mittels eines Zustellmechanismus an die Hauptmasse lösbar koppelbar ist. Vorteilhaft weist der Zustellmechanismus eine auf die Zusatzmasse wirkende vorgespannte zweite Feder auf. Der Zustellmechanismus ist vorteilhaft durch den Anwender der Handwerkzeugmaschine zu betätigen, so dass im Betrieb der Handwerkzeugmaschine durch Betätigen des Zustellmechanismus zwischen dem ersten und zweiten Betriebszustand umgeschaltet werden kann. Durch die vorteilhaft im Zustellmechanismus bereits auf die Zusatzmasse wirkende vorgespannte zweite Feder wird das Adaptieren des Tangentialschlagwerks mit erhöhter Gesamtmasse und erhöhter Federkraft vergleichsweise einfach und effektiv gestaltet.In a particularly preferred constructional development of the concept of the invention, it is provided that the additional mass can be detachably coupled to the main mass by means of a feed mechanism. The feed mechanism advantageously has a preloaded second spring acting on the additional mass. The feed mechanism is advantageous to operate by the user of the power tool, so that can be switched during operation of the power tool by pressing the feed mechanism between the first and second operating state. By virtue of the prestressed second spring, which already advantageously acts on the additional mass in the feed mechanism, the adaptation of the tangential impact tool with increased total mass and increased spring force is made comparatively simple and effective.
Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen zu entnehmen und geben im Einzelnen vorteilhafte Möglichkeiten an, das oben erläuterte Konzept im Rahmen der Aufgabenstellung sowie hinsichtlich weiterer Vorteile zu realisieren.Advantageous developments of the invention can be found in the dependent claims and specify in particular advantageous ways to realize the above-described concept within the scope of the problem and with regard to further advantages.
Vorteilhaft ist vorgesehen, dass der Zustellmechanismus entlang einer Steuerkulisse bewegbar ist. Beispielsweise kann der Zustellmechanismus von einem Nutzer bewegbar sein. Vorteilhaft ist der Zustellmechanismus dazu entlang einer Steuerkulisse axial verschiebbar. Der Zustellmechanismus kann auch entlang einer Steuerkulisse verdrehbar sein. Beides ist allein und in Kombination möglich, um beispielsweise zwischen dem vorgenannten ersten Betriebs- und zweiten Betriebszustand der Handwerkzeugmaschine zu schalten.It is advantageously provided that the feed mechanism is movable along a control link. For example, the delivery mechanism may be movable by a user. Advantageously, the feed mechanism is axially displaceable along a control link. The delivery mechanism may also be rotatable along a control link. Both are possible alone and in combination, for example, to switch between the aforementioned first operating and second operating state of the power tool.
Vorteilhaft ist die Hauptmasse und die Zusatzmasse in einem zweiten Betriebszustand formschlüssig aneinander gekoppelt. Dies hat sich als vergleichsweise einfacher Mechanismus zur Erhöhung der Gesamtmasse des Hammers erwiesen.Advantageously, the main mass and the additional mass are positively coupled to one another in a second operating state. This has proven to be a comparatively simple mechanism for increasing the overall mass of the hammer.
In einer vorteilhaften konstruktiven Weiterbildung weist der Zustellmechanismus einen Gehäusekäfig auf, in dem die genannte zweite Feder gegen die Zusatzmasse und den Gehäusekäfig vorgespannt ist. Ein solcher Gehäusekäfig ist vorteilhaft als ganzes frei bzw. gemäß einer Steuerkulisse bewegbar. Der Zustellmechanismus weist so eine in sich integral kompakte Form auf, die sicher zu betätigen ist.In an advantageous constructive development, the feed mechanism has a housing cage, in which said second spring is biased against the additional mass and the housing cage. Such a housing cage is advantageous as a whole freely or according to a control link movable. The feed mechanism thus has an intrinsically compact form which is safe to operate.
Vorteilhaft ist der Zustellmechanismus in einem ersten Betriebszustand von einem Sicherungselement gegen eine Bewegung gesichert. Ein Sicherungselement dient vorteilhaft dazu, ein ungewolltes Betätigen des Zustellmechanismus zu verhindern. Ein Sicherungselement kann dazu ausgelegt sein, den Zustellmechanismus für einen Betrieb der Handwerkzeugmaschine sowohl im ersten Betriebszustand als auch in einem zweiten Betriebszustand zu sichern. Beispielsweise kann ein Sicherungselement als Hebelsperre oder dergleichen ausgelegt sein, gegen dessen Widerstand der Zustellmechanismus zu betätigen ist oder das vom Anwender vor Betätigung des Zustellmechanismus ebenfalls zu betätigen ist.Advantageously, the feed mechanism is secured in a first operating state of a securing element against movement. A securing element advantageously serves to prevent unintentional actuation of the feed mechanism. A securing element can be designed to secure the feed mechanism for operation of the handheld power tool both in the first operating state and in a second operating state. For example, a securing element may be designed as a lever lock or the like against whose resistance the feed mechanism is to be actuated or which is also to be actuated by the user before actuation of the feed mechanism.
Grundsätzlich hat es sich als vorteilhaft erwiesen, dass Tangentialschlagwerk mit einem konstruktiv geeigneten kraftübertragenden Schlaggetriebe zu versehen, das auf den Hammer und/oder den Amboss wirkt. Ein Schlaggetriebe dient vorteilhaft dazu, Hammer und/oder Amboss gemäß einer Steuerkontur axial und unter verdrehen derselben gegeneinander tangential schlagend gegeneinander zu bewegen. Hammer und/oder Amboss weisen vorteilhaft jeweils eine Schlagfläche auf, über die ein Tangentialschlag übertragbar ist, um ein Spitzendrehmoment zwischen Hammer und Amboss zu übertragen. Beispielsweise kann das Schlaggetriebe in Form einer Kulissenführung mit einer gewindeartigen Steuerkontur gebildet sein, die auf einer den Antrieb und den Hammer koppelnden Spindel gebildet ist. Ein Schlaggetriebe kann auch Form einer Noppenanordnung mit einer schräg verlaufenden Steuerkontur gebildet sein, die auf einer Hammer und Amboss koppelnden Nocke gebildet ist. Andere Formen eines Schlaggetriebes sind möglich und nicht auf die vorgenannten vorteilhaften Weiterbildungen beschränkt.In principle, it has proved to be advantageous to provide the tangential impact mechanism with a structurally suitable force-transmitting impact gear which acts on the hammer and / or the anvil. A striking mechanism is advantageously used to move the hammer and / or anvil axially against one another according to a control contour and while twisting the same against each other tangentially. Hammer and / or anvil advantageously each have a striking surface over which a Tangentialschlag is transferable to transmit a peak torque between the hammer and anvil. For example, the percussion gear can be formed in the form of a slotted guide with a thread-like control contour, which is formed on a spindle coupling the drive and the hammer. A percussion gear may also be in the form of a knob arrangement with a slanted control contour formed on a cam and anvil coupling cam. Other forms of impact gear are possible and not limited to the aforementioned advantageous developments.
Im Rahmen einer besonders bevorzugten ersten weiterbildenden Variante der Erfindung ist vorgesehen, dass die Zusatzmasse eine Schlagfläche aufweist, die sich im gekoppelten Zustand von Zusatzmasse und Hauptmasse über eine Erstreckung der Hauptmasse axial gleich oder hinaus erstreckt. In dieser Variante ist die Schlagfläche der Zusatzmasse allein oder zusätzlich ausgebildet, gegen eine Ambossschlagfläche zur Übertragung eines Tangentialschlages anzuschlagen. Dies kann zu einer großflächigeren Gestaltung der Schlagfläche der Zusatzmasse und damit geringerer Beanspruchung der Zusatzmasse bei Ausführen des Tangentialschlags genutzt werden.In the context of a particularly preferred first further development variant of the invention, it is provided that the additional mass has a striking surface, which is coupled in the coupling Condition of additional mass and main mass extends axially equal to or beyond an extension of the main mass. In this variant, the impact surface of the additional mass alone or additionally formed to strike against an anvil impact surface for transmitting a Tangentialschlag. This can be used to a larger-scale design of the face of the additional mass and thus lower stress of the additional mass in carrying out the tangential impact.
In einer ebenfalls besonders bevorzugten zweiten weiterbildenden Variante der Erfindung ist vorgesehen, dass die Hauptmasse eine Schlagfläche aufweist, die sich im gekoppelten Zustand von Zusatzmasse und Hauptmasse über eine Erstreckung der Zusatzmasse axial hinaus erstreckt. In dieser weiterbildendenden Variante ist die Schlagfläche der Hauptmasse allein dazu ausgebildet, gegen eine Ambossschlagfläche anzuschlagen. Diese zweite Variante kann vorteilhaft dazu genutzt werden, die Schlagflächen, insbesondere die Ambossschlagfläche vergleichsweise klein auszuführen. Dies kann vorteilhaft zur Verringerung der Gesamtmasse des Tangentialschlagwerks genutzt werden.In a likewise particularly preferred second further development variant of the invention, it is provided that the main mass has a striking surface which extends axially beyond an extension of the additional mass in the coupled state of additional mass and main mass. In this further development variant, the striking surface of the main mass is designed solely to strike against an anvil striking surface. This second variant can advantageously be used to make the striking surfaces, in particular the anvil striking surface comparatively small. This can be used to advantage in reducing the total mass of the tangential impactor.
Ausführungsbeispiele der Erfindung werden nun nachfolgend anhand der Zeichnung beschrieben. Diese soll die Ausführungsbeispiele nicht notwendigerweise maßstäblich darstellen, vielmehr ist die Zeichnung, wo zur Erläuterung dienlich, in schematisierter und/oder leicht verzerrter Form ausgeführt. Im Hinblick auf Ergänzungen der aus der Zeichnung unmittelbar erkennbaren Lehren wird auf den einschlägigen Stand der Technik verwiesen. Dabei ist zu berücksichtigen, dass vielfältige Modifikationen und Änderungen betreffend die Form und das Detail einer Ausführungsform vorgenommen werden können, ohne von der allgemeinen Idee der Erfindung abzuweichen. Die in der Beschreibung, in der Zeichnung sowie in den Ansprüchen offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Weiterbildung der Erfindung wesentlich sein. Zudem fallen in den Rahmen der Erfindung alle Kombinationen aus zumindest zwei der in der Beschreibung, der Zeichnung und/oder den Ansprüchen offenbarten Merkmale. Die allgemeine Idee der Erfindung ist nicht beschränkt auf die exakte Form oder das Detail der im folgenden gezeigten und beschriebenen bevorzugten Ausführungsform oder beschränkt auf einen Gegenstand, der eingeschränkt wäre im Vergleich zu dem in den Ansprüchen beanspruchten Gegenstand. Bei angegebenen Bemessungsbereichen sollen auch innerhalb der genannten Grenzen liegende Werte als Grenzwerte offenbart und beliebig einsetzbar und beanspruchbar sein. Der Einfachheit halber sind nachfolgend für identische oder ähnliche Teile oder Teile mit identischer oder ähnlicher Funktion gleiche Bezugszeichen verwendet.Embodiments of the invention will now be described below with reference to the drawing. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that various modifications and changes may be made in the form and detail of an embodiment without departing from the general idea of the invention. The disclosed in the description, in the drawing and in the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article which would be limited in comparison to the subject matter claimed in the claims. For the given design ranges, values within the stated limits should also be disclosed as limit values and be arbitrarily usable and claimable. For simplicity, below are for identical or similar parts or parts with identical or similar function used the same reference numerals.
Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung der bevorzugten Ausführungsbeispiele sowie anhand der Zeichnung; diese zeigt in:
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Fig. 1 eine schematische Darstellung einer Handwerkzeugmaschine mit einem Tangentialschlagwerk gemäß dem Konzept der Erfindung; -
Fig. 2A, Fig. 2B ein Tangentialschlagwerk für eine Handwerkzeugmaschine derFig. 1 in einem ersten Betriebszustand bzw. einem zweiten Betriebszustand, letzterer mit erhöhter Gesamtmasse des Hammers und erhöhter Federkraft des Tangentialschlagwerks zur Verdeutlichung des Konzepts der Erfindung; -
Fig. 3A, Fig. 3B eine erste bevorzugte konstruktiv realisierte Ausführungsform eines Tangentialschlagwerks gemäß der ersten weiterbildenden Variante der Erfindung jeweils in einer axialen und einer Querschnittsdarstellung und für einen ersten bzw. zweiten Betriebszustand; -
Fig. 4A, Fig. 4B eine zweite bevorzugte konstruktiv realisierte Ausführungsform eines Tangentialschlagwerks gemäß der zweiten weiterbildenden Variante der Erfindung jeweils in einer axialen und einer Querschnittsdarstellung und für einen ersten bzw. zweiten Betriebszustand; -
Fig. 5 ein beispielhaft gemessenes Drehmoment als Funktion der Zeit in Folge der Betätigung des Tangentialschlagwerks beim Eindrehen eines Schraubankers in einen festen Untergrund - in Ansicht A unter Nutzung der Handwerkzeugmaschine mit dem Tangentialschlagwerk in einem ersten Betriebszustand und in Ansicht B in einem zweiten Betriebszustand bei erhöhter Gesamtmasse des Hammers und erhöhter Federkraft des Tangentialschlagwerks gemäß dem Konzept der Erfindung. -
Fig. 1 zeigt eine Handwerkzeugmaschine 100, die beispielsweise in Form eines Schlagschraubers, aneinem vom Gehäuse 101 gebildeten Handgriff 102 gehalten werden kann und derenAntrieb 104 vorliegend über einenTrigger 103 in Form eines Hebels oder Druckknopfes aktiviert werden kann.Der Antrieb 104 ist hier mit einemMotor 105 in Form eines Elektromotors gebildet, der eine inFig. 2 angedeutete Drehbewegung 1über ein Getriebe 106 auf eineSpindel 20 überträgt. Die Drehbewegung 1der Spindel 20 wird über das inFig. 2 näher beschriebene Tangentialschlagwerk 10 in eine drehende und teilweise tangential schlagende Bewegung der Antriebswelle 30 umgesetzt; diese drehende und teilweise tangential schlagende Bewegung der Antriebswelle 30 überträgt sich auf ein nicht näher dargestelltes Werkzeug in einer Werkzeugaufnahme derHandwerkzeugmaschine 100. Das auf gleicher Achse 2 wie die Spindel- 20, 30 inund Antriebswelle der Werkzeugaufnahme 40 angebrachte Werkzeug, beispielsweise ein Schrauber oder dergleichen ist so in der Lage höhere Drehmomente als mit der kontinuierlichen Drehmomentleistung desMotors 105 erreichbar auf beispielsweise eine Schraube zu übertragen.Das Tangentialschlagwerk 10 kann im Rahmen eines einfachen Feder-Masse-Systems modelliert werden und wird vorliegend im resonanten Bereich betrieben, was dem Drehmomentspitzenübertrag auf das Werkzeug und die Schraube optimiert. Eine bevorzugte Anwendung eines dargestellten Schlagschraubers ist z. B. das Einschrauben von Schrauben oder Setzen eines Ankers in Beton oder dergleichen harten Untergrund.
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Fig. 1 a schematic representation of a hand tool with a Tangentialschlagwerk according to the concept of the invention; -
Fig. 2A, Fig. 2B a Tangentialschlagwerk for a hand tool of theFig. 1 in a first operating state or a second operating state, the latter with increased overall mass of the hammer and increased spring force of the tangential impact mechanism to clarify the concept of the invention; -
Fig. 3A, Fig. 3B a first preferred constructive realized embodiment of a Tangentialschlagwerks according to the first further developing variant of the invention in each case in an axial and a cross-sectional view and for a first and second operating state; -
Fig. 4A, Fig. 4B a second preferred structurally realized embodiment of a Tangentialschlagwerks according to the second further developing variant of the invention in each case in an axial and a cross-sectional view and for a first and second operating state; -
Fig. 5 an exemplary measured torque as a function of time due to the operation of the tangential impact when screwing a screw anchor in a solid ground - in view A using the hand tool with the Tangentialschlagwerk in a first operating state and in view B in a second operating state with increased total mass of the hammer and increased spring force of the tangential impact according to the concept of the invention. -
Fig. 1 shows ahand tool 100, which can be held, for example in the form of a striking screwdriver, on ahandle 102 formed by thehousing 101 and thedrive 104 in this case via atrigger 103 in the form of a lever or Push button can be activated. Thedrive 104 is formed here with amotor 105 in the form of an electric motor having an inFig. 2 indicated rotational movement 1 transmits via agear 106 to aspindle 20. The rotational movement 1 of thespindle 20 is about the inFig. 2 described tangential impactor 10 implemented in a rotating and partially tangential striking movement of thedrive shaft 30; this rotating and partially tangential striking movement of thedrive shaft 30 is transmitted to a tool not shown in detail in a tool holder of thepower tool 100. The same axis 2 as the spindle and drive 20, 30 mounted in theshaft tool holder 40 tool, such as a screwdriver or such is capable of transmitting higher torques than achievable with the continuous torque output of themotor 105 to, for example, a screw. Thetangential impactor 10 can be modeled in the context of a simple spring-mass system and is operated here in the resonant range, which optimizes the torque peak transfer to the tool and the screw. A preferred application of an impact wrench shown is z. As the screwing of screws or setting an anchor in concrete or the like hard ground.
Das adaptive Tangentialschlagwerk 10 kann gemäß dem Konzept der Erfindung auch in einem zweiten in
Beide Federn 81, 82 stützen sich wiederum gegen den Anschlag 83 ab. In dem in
Die axiale und verdrehende Bewegung des Hammers 70 wird vorliegend durch ein Schlaggetriebe in Form einer nicht näher gezeigten Kulissenführung auf der Spindel 20 realisiert. Die Kulissenführung weist eine gewindeartige Steuerkontur auf, die den Hammer 70 mit Hauptmasse 71 und 72 zu einer drehenden Bewegung unter axialem Vorschub zum Amboss 60 zwangsgeführt, wobei die Bewegung durch das Federsystem 80 getrieben ist.
Das Tangentialschlagwerk 10A weist in der in
Zur konstruktiven Realisierung der An- und Abkopplung einer Zusatzmasse 72 mit der zweiten Feder 82 ist vorliegend ein frei entlang der Spindel 20 verschiebbarer und drehbar gelagerter Gehäusekäfig 90 realisiert. Der Gehäusekäfig 90 ist entlang einer nicht näher dargestellten Steuerkulisse frei axial verschiebbar und drehbar gelagert. Das heißt durch Drehen bzw. Verschieben des mit dem Gehäusekäfig fest verbundenen und das Gehäuse 101 der Handwerkzeugmaschine 100 durchgreifenden Steuerrads 91 lässt sich der Zustellmechanismus betätigen sobald die ein ungewolltes Betätigen verhindernden Sicherungselemente 92 entrastet sind. Die Sicherungselemente 92 sind vorliegend in Form von gegen den Gehäusekäfig 90 gestellten Kipphebeln gebildet. Bei Betätigung des Zustellmechanismus über das Steuerrad 91 lässt sich der Gehäusekäfig 90 über den Widerstand der Kipphebel hinweg verdrehen bzw. verschieben. Dazu werden die an einem Gehäuse 101 der Handwerkzeugmaschine angebrachten Kipphebel zum Gehäuse hin vom Steuerrad 91 weggedrückt.For the structural realization of the coupling and decoupling of an
Im Unterschied zur symbolischen Darstellung der
Die ringförmig ausgestalteten Hauptmasse 71 und Zusatzmasse 72 sind vorliegend jedenfalls teilweise konzentrisch zueinander angeordnet. Dabei umgibt die Zusatzmasse 72 die Hauptmasse ringförmig und formschlüssig im zweiten Betriebszustand, während die Hauptmasse 71 von einer Steuerkontur einer Kulissenführung auf der Spindel 20 geführt wird.The annular designed
Das Tangentialschlagwerk 10A ist vorliegend mit Schraubverbindungen 107 am Gehäuse 101 der Handwerkzeugmaschine 100 befestigt. Dazu halten die Schraubverbindungen 107 einen Lagerblock 108, der antriebsseitig die Lager 109 für die Spindel 20 umfasst.In the present case, the
In der in
Sowohl die Hauptmasse 71 als auch die Zusatzmasse 72 kann also geeignete Nocken 73 mit Schlagfläche 74 zur Ausführung eines Tangentialschlags am Amboss 60 aufweisen. Gemäß der vorliegend beschriebenen ersten Ausführungsform eines adaptiven Tangentialschlagwerks 10A kann die Schlagfläche 74 von einem Nocken 75 der Zusatzmasse 72 gebildet sein oder - in der Abwandlung - sowohl von einem Nocken 73 der Hauptmasse als auch von einem Nocken 75 der Zusatzmasse 72. Gerade im letzteren Fall erhöht sich die insgesamt verfügbare Schlagfläche 74 zum Tangentialschlag am Amboss 60, so dass beim Tangentialschlag die Drehmomentspitzenübertragung auf eine vergleichsweise große Fläche verteilt ist. Dies führt letztlich zu einer geringeren Abnutzung der Nocken 73, 75 an Hauptmasse 71 und Zusatzmasse 72.Both the
In einer leicht abgewandelten Ausführungsform steht die Schlagfläche des Nockens 75 der Zusatzmasse 72 gegenüber dem Nocken 73 der Hauptmasse leicht vor, so dass nur der Nocken 75 der Zusatzmasse 72 beim Tangentialschlag Kontakt zum Amboss 60 hat. In beiden Abwandlungen sind durch den beschriebenen Zustellmechanismus die Hauptmasse 71 und die Zusatzmasse 72 formschlüssig miteinander verbunden. Sowohl die Hauptmasse als auch die Zusatzmasse 72 als auch die erste Feder 81 und die zweite Feder 82 stehen zur Drehmomentübertragung beim Tangentialschlag 10A im in
Im Einzelnen hat die Hauptmasse vorliegend ein Gewicht von M1 = 135 g und die Zusatzmasse 72 ein Gewicht von M2 = 120 g. Vorliegend hat die Zusatzmasse 72 also ein geringeres Gewicht als die Hauptmasse. Entsprechend ist der Trägheitsmomentunterschied zwischen Hauptmasse und Zusatzmasse nicht so groß wie beim adaptiven Tangentialschlagwerk 10A. Das Trägheitsmoment der Hauptmasse beträgt etwa I1 = 40 000 gmm2. Das Trägheitsmoment der Zusatzmasse beträgt etwa I2 = 75 000 gmm2. Die Federsteifigkeit zur Bildung der Federkonstante K1 der ersten Feder ist vorliegend mit 11 KN/m gewählt. Die Federsteifigkeit zur Bildung der Federkonstante K2 der zweiten Feder ist vorliegend mit 24 KN/m gebildet. Sowohl beim adaptiven Tangentialschlagwerk 10A als auch beim adaptiven Tangentialschlagwerk 10B ist beim Federsystem die zweite Federkonstante K2 somit größer als die erste Federkonstante K1. In beiden Fällen ist die bevorzugte Schlagfrequenz des Tangentialschlagwerks 10A, 10B, das heißt die Eigenfrequenz des Gesamt-Feder-Masse-Systems, im ersten und zweiten Betriebszustand in etwa gleich.In detail, the main mass in the present case has a weight of M1 = 135 g and the
Die Wahl der vorliegend beschriebenen Massen M1, M2, Trägheitsmomente I1, I2 und Federsteifigkeiten K1, K2sind keinesfalls eingeschränkt auf die zuvor genannten Werte. Vielmehr hat sich durch Messungen, wie sie in
Claims (12)
- Hand machine tool (100), particularly in the form of an impact screwdriver, with- a tool holder applied to a drive shaft (30) for holding a tool, particularly a screwdriver, in which- the drive shaft (30) may be moved by means of a tangential striking mechanism (10, 10A, 10B) that may be driven by a drive (104), particularly a motor (105) and/or gear (106), in a rotating
and partly tangentially striking movement,
in which- the tangential striking mechanism (10, 10A, 10B) has an anvil (60) allocated to the drive shaft (30) and a hammer (70) allocated to the drive (104), which may be moved against each other axially by applying the force of at least a first spring (81) and tangentially striking against each other by twisting the same, in which- the hammer (70) has a
main mass (71), and in which- an additional mass (72), which has the force of a second spring (82) applied to it, may be connected to the main mass (71),
characterised in that the additional mass (72) may be connected to the main mass (71) in a detachable way. - Hand machine tool (100) according to claim 1, characterised in that in a first operating condition the main mass (71) of the hammer (70) and the anvil (60) may be moved against each other axially solely by applying the force of the first spring (81) and tangentially striking against each other by twisting the same.
- Hand machine tool (100) according to claim 1 or 2, characterised in that in a second operating condition the main mass (71) and the additional mass (72) of the hammer (70) and anvil (60) may be moved against each other axially by applying the force of the first and second spring (81, 82) and tangentially striking against each other by twisting the same.
- Hand machine tool (100) according to claim 1 or 2, characterised in that the additional mass (72) may be connected to the main mass (71) in a detachable way by means of an adjusting mechanism, in which the adjusting mechanism has a pretensioned second spring (82) acting on the additional mass (72).
- Hand machine tool (100) according to one of claims 1 to 4, characterised in that the adjusting mechanism may be moved along a control slide, particularly may be twisted and/or moved axially by a user.
- Hand machine tool (100) according to one of claims 1 to 5, characterised in that the main mass (71) and the additional mass (72) are connected positively in a second operating condition.
- Hand machine tool (100) according to one of claims 1 to 6, characterised in that the additional mass (72) has a striking face, which in the connected condition of the additional mass (72) and the main mass (71) extends axially equally or over an extension of the main mass (71) until it stops against an anvil striking face.
- Hand machine tool (100) according to one of claims 1 to 7, characterised in that the main mass (71) has a striking face, which in the connected condition of the additional mass (72) and the main mass (71) extends axially over an extension of the additional mass (72) until it stops against an anvil striking face.
- Hand machine tool (100) according to one of claims 1 to 8, characterised in that the adjusting mechanism has a housing cage (90), in which the second spring (82) is pretensioned against the additional mass (72) and the housing cage (90).
- Hand machine tool (10) according to one of claims 1 to 9, characterised in that in a first operating condition the adjusting mechanism is secured against movement by a securing element (92).
- Hand machine tool (100) according to one of claims 1 to 10, characterised in that the weights of the masses (71, 72) and stiffnesses of the springs (81, 82) are made in such a way that a resonance frequency of the tangential striking mechanism (10, 10A, 10B) is essentially the same in a first and second operating condition.
- Hand machine tool (100) according to one of claims 1 to 11, characterised in that the tangential striking mechanism (10, 10A, 10B) has a force-transmitting impact gear acting on the hammer (70) and/or anvil (60), by means of which the same may be moved against each other axially according to a control contour and tangentially striking against each other by twisting the same.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102010062014A DE102010062014B3 (en) | 2010-11-26 | 2010-11-26 | Hand tool |
Publications (3)
Publication Number | Publication Date |
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EP2457694A2 EP2457694A2 (en) | 2012-05-30 |
EP2457694A3 EP2457694A3 (en) | 2018-03-14 |
EP2457694B1 true EP2457694B1 (en) | 2019-05-15 |
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ID=45315465
Family Applications (1)
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EP11188467.2A Active EP2457694B1 (en) | 2010-11-26 | 2011-11-09 | Power tool |
Country Status (4)
Country | Link |
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US (1) | US8950508B2 (en) |
EP (1) | EP2457694B1 (en) |
JP (1) | JP6009756B2 (en) |
DE (1) | DE102010062014B3 (en) |
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JP6397325B2 (en) * | 2014-12-22 | 2018-09-26 | 株式会社Tjmデザイン | Rotating tool |
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CN109803793B (en) * | 2016-10-11 | 2021-09-24 | 英格索兰工业美国公司 | Impact wrench with dynamically adjustable drive member and method therefor |
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Also Published As
Publication number | Publication date |
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DE102010062014B3 (en) | 2012-05-10 |
JP2012111035A (en) | 2012-06-14 |
US8950508B2 (en) | 2015-02-10 |
EP2457694A2 (en) | 2012-05-30 |
JP6009756B2 (en) | 2016-10-19 |
EP2457694A3 (en) | 2018-03-14 |
US20120132452A1 (en) | 2012-05-31 |
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