WO2011072908A1 - Power tool - Google Patents

Power tool Download PDF

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Publication number
WO2011072908A1
WO2011072908A1 PCT/EP2010/065518 EP2010065518W WO2011072908A1 WO 2011072908 A1 WO2011072908 A1 WO 2011072908A1 EP 2010065518 W EP2010065518 W EP 2010065518W WO 2011072908 A1 WO2011072908 A1 WO 2011072908A1
Authority
WO
WIPO (PCT)
Prior art keywords
power tool
destructive interference
drill
processor
tool
Prior art date
Application number
PCT/EP2010/065518
Other languages
German (de)
French (fr)
Inventor
Holger Ruebsaamen
Andreas Schlegel
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to CN201080057235.4A priority Critical patent/CN102655989B/en
Priority to EP10770790A priority patent/EP2512748A1/en
Priority to RU2012129662/02A priority patent/RU2012129662A/en
Publication of WO2011072908A1 publication Critical patent/WO2011072908A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • 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
    • B25D17/11—Arrangements of noise-damping means
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • 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
    • B25D2250/221—Sensors
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/121—Rotating machines, e.g. engines, turbines, motors; Periodic or quasi-periodic signals in general

Definitions

  • Power tool The present invention relates to a power tool according to the preamble of
  • a drilling machine is in particular a tool with which holes can be drilled in a respective body by means of a drill.
  • the drill is rotated by a torque generator, usually an electric motor, in the required rotational movement.
  • a torque generator usually an electric motor
  • a significant reduction of acoustic emissions of power tools can be achieved.
  • Passive means to reduce the impact of noise on an operator can be substantially eliminated.
  • the device for generating destructive interference has a processor and a transmitter interacting with the processor and / or a loudspeaker unit interacting with the processor.
  • a processor By means of such a processor sound waves of suitable frequency, amplitude and phase for generating destructive interference in superimposition can be generated with occurring during operation of the power tool sound emissions, which can then be emitted by the transmitter and / or the speaker unit accordingly.
  • the device according to the invention for generating destructive interferences comprises means for generating destructive interferences with respect to noises generated by the power tool, which have previously known amplitudes or amplitude responses and / or frequencies or frequency responses.
  • noises generated by the power tool which have previously known amplitudes or amplitude responses and / or frequencies or frequency responses.
  • inherent machine noise, z As engine or transmission noise, be compensated in a simple manner, since their frequencies and amplitudes known from the outset Furthermore, these frequencies and amplitudes are substantially constant or change in a known manner.
  • the device according to the invention for generating destructive interference has a sensor, in particular a microphone, and a processor unit cooperating with the microphone.
  • a sensor in particular a microphone
  • a processor unit cooperating with the microphone.
  • processors can be embodied as individual processors, and / or in any desired manner, for example as a common processor.
  • the invention is particularly advantageous in drilling machines, such as impact drills, rotary hammers, impact hammers or Akkubohrmaschinen, as well as sawing machines or grinding machines used.
  • Figure 1 shows schematically a preferred embodiment of an inventively designed drill.
  • FIG. 1 shows, by way of example, a hand-held impact drill with a tool holder 10 for receiving a drill 12, which has an electric motor 14 arranged in a housing 40 via a gear 24 and a counter stage 25 with several rotational frequencies and via a pneumatic percussion mechanism 42 with a percussion frequency is drivable.
  • the impact mechanism 42 has a guided in a hammer tube 44 exciter piston 46 which acts on the shaft end of the drill via an air cushion 48, a bat or flying piston 50 and a striker 52.
  • a Schlager- generation can also be done on grid disks.
  • the impact production shown here via a striking mechanism with piston, racket and striker is preferred in the case of rotary hammers.
  • the electric motor 14 can be controlled or regulated by means of a control and / or regulating device 26 which can be actuated by a switch 15.
  • the illustrated drilling machine further comprises a device 21 for generating destructive interference, by means of which noise emissions occurring during operation of the drilling machine can be reduced or completely suppressed.
  • the device 21 expediently has a processor device 21a and a loudspeaker unit 23 for emission of suitable frequencies by means of which destructive interferences can be generated.
  • the destructive interferences are generated by generating and transmitting corresponding phase-shifted sound waves or frequencies based on sound waves of particular frequency and amplitude which arise during operation of the drilling machine, which superimpose themselves with the original waves to produce destructive interferences.
  • Destructive interferences can be provided especially when additional sound waves with the same frequency and amplitude, but correspondingly opposite phase, are generated.
  • the device 21 When operating the drill, however, there are also sound waves whose frequencies and amplitudes are not known from the outset, and which in particular depend on a machined body or material.
  • the device 21 furthermore has a sensor, in particular a microphone, by means of which sound waves produced in this way can be detected.
  • the processor unit 21 a which is provided in the device 21, then corresponding sound waves with suitable amplitudes, frequencies and / or phases for generating destructive interference can be generated, which can be emitted via the transmitter or the speaker 23.
  • the processor is capable of generating, in real time, a corresponding counter-sound with respect to the sound waves picked up by the microphone 25. In practice, efforts should be made to minimize the time lag between emissions and counter-noise.
  • the positioning of the device 21 shown in Figure 1, together with the positioning of the processor 21 a or the transmitter or speaker 23 and the microphone 25 is purely schematic and exemplary. It is also possible to position the four components 21, 21 a, 23 and 25 separately from each other at respective suitable locations within the housing 40.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The present invention relates to a power tool, comprising an electric motor (14) for driving a tool unit (10, 12), having a device (21) for generating destructive interferences in order to reduce noise occurring during operation.

Description

Beschreibung  description
Titel title
Elektrowerkzeug Die vorliegende Erfindung betrifft ein Elektrowerkzeug nach dem Oberbegriff des Power tool The present invention relates to a power tool according to the preamble of
Patentanspruchs 1 . Patent claim 1.
Stand der Technik Elektrowerkzeuge, insbesondere Bohrmaschinen, sind in vielfältigen Ausführungen bekannt. Eine Bohrmaschine ist insbesondere ein Werkzeug, mit dem mittels eines Bohrers Löcher in jeweilige Körper gebohrt werden können. Der Bohrer wird durch einen Drehmomenterzeuger, in der Regel einen Elektromotor, in die erforderliche Drehbewegung versetzt. Als spezielle Ausführungsformen von Bohrmaschinen sei insbesondere auf Schlagbohrmaschinen, SchlaghammerPRIOR ART Power tools, in particular drills, are known in many designs. A drilling machine is in particular a tool with which holes can be drilled in a respective body by means of a drill. The drill is rotated by a torque generator, usually an electric motor, in the required rotational movement. As special embodiments of drills is especially on percussion drills, percussion hammer
Bohrhammer sowie Akkubohrmaschinen verwiesen. Zusätzlich zu Bohrern sei auch auf die Möglichkeit der Verwendung von zum Beispiel Meißeln als Einsatzwerkzeugen hingewiesen. Derartige Bohrmaschinen, insbesondere Schlagbohrmaschinen oder Bohrhammer, weisen eine starke Geräuschemission auf. Hier ist zunächst auf die Geräuschentwicklung des verwendeten Elektromotors bzw. eines von diesem beaufschlagten Getriebes hinzuweisen. Ferner entsteht auch durch den Bohr- und/oder Schlagvorgang selbst, d. h. durch die Wechselwirkung des Bohrers (bzw. eines alternativ verwendeten Einsatzwerkzeuges) mit dem zu bohrenden bzw. zu bearbeitenden Körper, eine in Frequenz und Amplitude veränderliche Schallemission. Hammer drill and Akkubohrmaschinen referenced. In addition to drills, reference should also be made to the possibility of using, for example, chisels as insert tools. Such drills, in particular percussion drills or hammer drill, have a strong noise emission. Here, first of all, reference should be made to the noise development of the electric motor used or of a transmission acted on by it. Furthermore, it is also caused by the drilling and / or impact itself, d. H. by the interaction of the drill (or an alternative use tool used) with the body to be drilled or machined, a variable in frequency and amplitude sound emission.
Diese Geräusche übersteigen zum Teil die zulässigen Grenzwerte für den Be- diener, und müssen durch geeignete Schutzmaßnahmen, beispielsweise Kopfhörer reduziert werden. Es sind auch weitere passive Mittel zur Reduzierung von Geräuschen, welche auf den Bediener einwirken, bekannt. Die Bereitstellung derartiger passiver Mittel zur Geräuschreduzierung ist aufwendig. These noises in some cases exceed the permissible limits for the operator, and must be reduced by suitable protective measures, such as headphones. There are also other passive means of reducing Noise interacting with the operator is known. The provision of such passive means for noise reduction is expensive.
Es ist daher wünschenswert, die Schallemission von Bohrmaschinen zu vermindern. It is therefore desirable to reduce the noise emissions of drills.
Offenbarung der Erfindung Disclosure of the invention
Erfindungsgemäß wird ein Elektrowerkzeug mit den Merkmalen des Patentanspruchs 1 vorgeschlagen. According to the invention, a power tool with the features of claim 1 is proposed.
Vorteilhafte Ausgestaltungen sind Gegenstand der Unteransprüche sowie der nachfolgenden Beschreibung. Advantageous embodiments are the subject of the dependent claims and the following description.
Erfindungsgemäß ist eine signifikante Verminderung von Schallemissionen von Elektrowerkzeugen erzielbar. Auf passive Mittel, um die Einwirkung von Geräuschen auf einen Bediener zu vermindern, kann im Wesentlichen verzichtet werden. According to the invention, a significant reduction of acoustic emissions of power tools can be achieved. Passive means to reduce the impact of noise on an operator can be substantially eliminated.
Zweckmäßigerweise weist die Einrichtung zur Erzeugung destruktiver Interferenzen einen Prozessor und einen mit dem Prozessor zusammenwirkenden Sender und/oder eine mit dem Prozessor zusammenwirkende Lautsprechereinheit auf. Mittels eines derartigen Prozessors sind Schallwellen geeigneter Frequenz, Amplitude und Phase zur Erzeugung destruktiver Interferenzen bei Überlagerung mit beim Betrieb des Elektrowerkzeugs auftretenden Schallemissionen generierbar, welche dann mittels des Senders und/oder der Lautsprechereinheit entsprechend abgestrahlt werden können. Expediently, the device for generating destructive interference has a processor and a transmitter interacting with the processor and / or a loudspeaker unit interacting with the processor. By means of such a processor sound waves of suitable frequency, amplitude and phase for generating destructive interference in superimposition can be generated with occurring during operation of the power tool sound emissions, which can then be emitted by the transmitter and / or the speaker unit accordingly.
Es erweist sich als vorteilhaft, dass die erfindungsgemäß vorgesehene Einrichtung zur Erzeugung destruktiver Interferenzen Mittel zur Erzeugung destruktiver Interferenzen bezüglich vom Elektrowerkzeug erzeugter Geräusche, welche vorbekannte Amplituden bzw. Amplitudengänge und/oder Frequenzen bzw. Frequenzgänge aufweisen, umfasst. Mit dieser Maßnahme können inhärente Maschinengeräusche, z. B. Motor oder Getriebegeräusche, in einfacher Weise kompensiert werden, da ihre Frequenzen und Amplituden von vornherein bekannt sind, und diese Frequenzen und Amplituden ferner im Wesentlichen konstant sind oder sich in vorbekannter Weise ändern. It proves to be advantageous that the device according to the invention for generating destructive interferences comprises means for generating destructive interferences with respect to noises generated by the power tool, which have previously known amplitudes or amplitude responses and / or frequencies or frequency responses. With this measure, inherent machine noise, z. As engine or transmission noise, be compensated in a simple manner, since their frequencies and amplitudes known from the outset Furthermore, these frequencies and amplitudes are substantially constant or change in a known manner.
Besonders bevorzugt ist, dass die erfindungsgemäß vorgesehene Einrichtung zur Erzeugung destruktiver Interferenzen einen Sensor, insbesondere ein Mikrofon, und eine mit dem Mikrofon zusammenwirkende Prozessoreinheit aufweist. Mittels eines derartigen Mikrofons können während des Betriebes, insbesondere aufgrund einer Wechselwirkung mit einem zu bearbeitenden Körper oder Material, erzeugte Geräusche erfasst und kompensiert werden. It is particularly preferred that the device according to the invention for generating destructive interference has a sensor, in particular a microphone, and a processor unit cooperating with the microphone. By means of such a microphone, noises generated during operation, in particular due to an interaction with a body or material to be processed, can be detected and compensated.
Es sei an dieser Stelle angemerkt, dass die erwähnten Prozessoren als einzelne Prozessoren, und/oder in beliebiger Weise integriert, beispielsweise zu einem gemeinsamen Prozessor, ausgebildet sein können. It should be noted at this point that the mentioned processors can be embodied as individual processors, and / or in any desired manner, for example as a common processor.
Die Erfindung ist insbesondere bei Bohrmaschinen, beispielsweise Schlagbohrmaschinen, Bohrhämmern, Schlaghammern oder Akkubohrmaschinen, sowie bei Sägemaschinen oder auch Schleifmaschinen vorteilhaft einsetzbar. The invention is particularly advantageous in drilling machines, such as impact drills, rotary hammers, impact hammers or Akkubohrmaschinen, as well as sawing machines or grinding machines used.
Weitere Vorteile und Ausgestaltungen der Erfindung ergeben sich aus der Beschreibung und der beiliegenden Zeichnung. Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings.
Es versteht sich, dass die vorstehend genannten und die nachfolgend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen. It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.
Die Erfindung wird nun anhand eines Ausführungsbeispiels in der Zeichnung schematisch dargestellt, und wird im Folgenden unter Bezugnahme auf die Zeichnung weiter beschrieben. The invention will now be described schematically with reference to an embodiment in the drawing, and will be further described below with reference to the drawings.
Kurze Beschreibung der Zeichnung Short description of the drawing
Figur 1 zeigt schematisch eine bevorzugten Ausführungsform einer erfindungsgemäß ausgebildeten Bohrmaschine. Figure 1 shows schematically a preferred embodiment of an inventively designed drill.
Ausführungsform(en) der Erfindung Figur 1 zeigt, beispielhaft, eine Handschlagbohrmaschine mit einer Werkzeughal- terung 10 zur Aufnahme eines Bohrers 12, die mit einem in einem Gehäuse 40 angeordneten Elektromotor 14 über ein Getriebe 24 und eine Vorgelegestufe 25 mit mehreren Drehfrequenzen und über ein pneumatisches Schlagwerk 42 mit einer Schlagfrequenz antreibbar ist. Das Schlagwerk 42 besitzt einen in einem Hammerrohr 44 geführten Erregerkolben 46, der über ein Luftpolster 48, einen Schläger bzw. Flugkolben 50 und einen Döpper 52 auf das Schaftende des Bohrers wirkt. Es sei angemerkt, dass bei einer Schlagbohrmaschine eine Schlager- zeugung auch über Rasterscheiben erfolgen kann. Die hier dargestellte Schlagerzeugung über ein Schlagwerk mit Kolben, Schläger und Döpper ist im Falle von Bohrhämmern bevozugt. Embodiment (s) of the invention FIG. 1 shows, by way of example, a hand-held impact drill with a tool holder 10 for receiving a drill 12, which has an electric motor 14 arranged in a housing 40 via a gear 24 and a counter stage 25 with several rotational frequencies and via a pneumatic percussion mechanism 42 with a percussion frequency is drivable. The impact mechanism 42 has a guided in a hammer tube 44 exciter piston 46 which acts on the shaft end of the drill via an air cushion 48, a bat or flying piston 50 and a striker 52. It should be noted that in a percussion drill a Schlager- generation can also be done on grid disks. The impact production shown here via a striking mechanism with piston, racket and striker is preferred in the case of rotary hammers.
Der Elektromotor 14 ist mittels einer durch einen Schalter 15 betätigbaren Steu- er- und/oder -Regeleinrichtung 26 steuerbar bzw. regelbar. The electric motor 14 can be controlled or regulated by means of a control and / or regulating device 26 which can be actuated by a switch 15.
Die dargestellte Bohrmaschine weist ferner eine Einrichtung 21 zur Erzeugung destruktiver Interferenzen auf, mittels der beim Betrieb der Bohrmaschine auftretende Schallemissionen vermindert bzw. vollständig unterdrückt werden können. Die Einrichtung 21 weist zweckmäßigerweise eine Prozessoreinrichtung 21 a und eine Lautsprechereinheit 23 zur Emission von geeigneten Frequenzen, mittels derer destruktive Interferenzen generierbar sind, auf. Die destruktiven Interferenzen werden dadurch erzeugt, dass auf der Basis von Schallwellen bestimmter Frequenz und Amplitude, die beim Betrieb der Bohrmaschine entstehen, ent- sprechende phasenverschobene Schallwellen bzw. Frequenzen erzeugt und gesendet werden, welche sich mit den ursprünglichen Wellen unter Erzeugung destruktiver Interferenzen überlagern. Destruktive Interferenzen sind insbesondere bei Erzeugung von zusätzlichen Schallwellen mit gleicher Frequenz und Amplitude, aber entsprechend entgegengesetzter Phase, bereitstellbar. Insbesondere bei Erzeugung von Schallwellen, die bezüglich beim normalen Betrieb der Bohrmaschine entstehender Schallwellen um 180° phasenverschoben sind, ist eine vollständige destruktive Interferenz bereitstellbar. Es ist aber auch möglich, signifikante destruktive Interferenzeffekte bei zusätzlicher Erzeugung von Schallwellen mit gleicher Frequenz, aber unterschiedlicher Amplitude und Phase (bezüg- lieh der bei Betrieb der Bohrmaschine entstehenden Frequenzen) zu generieren. Bestimmte Frequenzen bzw. Frequenzgänge, welche beim Betrieb der Bohrmaschine stets entstehen, sind vorbekannt. Die Einrichtung 21 kann somit mit Mitteln ausgebildet werden, welche für diese vorbekannten Frequenzen, beispielsweise einer Frequenz des Getriebes 24, stets entsprechende Schallwellen mit destruktiver Interferenz erzeugen. Entsprechende Informationen bezüglich vorbekannter Frequenzen sind z. B. in dem Prozessor 21 a ablegbar. The illustrated drilling machine further comprises a device 21 for generating destructive interference, by means of which noise emissions occurring during operation of the drilling machine can be reduced or completely suppressed. The device 21 expediently has a processor device 21a and a loudspeaker unit 23 for emission of suitable frequencies by means of which destructive interferences can be generated. The destructive interferences are generated by generating and transmitting corresponding phase-shifted sound waves or frequencies based on sound waves of particular frequency and amplitude which arise during operation of the drilling machine, which superimpose themselves with the original waves to produce destructive interferences. Destructive interferences can be provided especially when additional sound waves with the same frequency and amplitude, but correspondingly opposite phase, are generated. In particular, in the production of sound waves which are 180 ° out of phase with respect to sound waves produced during normal operation of the drilling machine, complete destructive interference can be provided. However, it is also possible to generate significant destructive interference effects with additional generation of sound waves having the same frequency but different amplitude and phase (relative to the frequencies that arise during operation of the drilling machine). Certain frequencies or frequency responses which always occur during operation of the drilling machine are previously known. The device 21 can thus be formed by means which always generate corresponding sound waves with destructive interference for these previously known frequencies, for example a frequency of the transmission 24. Corresponding information regarding previously known frequencies are z. B. in the processor 21 a can be stored.
Beim Betrieb der Bohrmaschine kommt es jedoch auch zu Schallwellen, deren Frequenzen und Amplituden nicht von vornherein bekannt sind, und welche insbesondere von einem bearbeiteten Körper oder Material, abhängig sind. Zur Erfassung derartiger Frequenzen weist die Einrichtung 21 ferner einen Sensor, insbesondere ein Mikrofon auf, mittels dessen derart entstehende Schallwellen er- fasst werden können. Mittels der Prozessoreinheit 21 a, welche in der Einrichtung 21 vorgesehen ist, können dann entsprechende Schallwellen mit geeigneten Amplituden, Frequenzen und/oder Phasen zur Erzeugung destruktiver Interferenzen erzeugt werden, welche über den Sender bzw. den Lautsprecher 23 abgestrahlt werden können. Der Prozessor ist insbesondere in der Lage, idealerweise in Echtzeit einen entsprechenden Gegenschall bezüglich der durch das Mikrofon 25 aufgenommenen Schallwellen zu erzeugen. In der Praxis ist anzustreben, den Zeitversatz zwischen Emissionen und Gegenschall zu minimieren. When operating the drill, however, there are also sound waves whose frequencies and amplitudes are not known from the outset, and which in particular depend on a machined body or material. To detect such frequencies, the device 21 furthermore has a sensor, in particular a microphone, by means of which sound waves produced in this way can be detected. By means of the processor unit 21 a, which is provided in the device 21, then corresponding sound waves with suitable amplitudes, frequencies and / or phases for generating destructive interference can be generated, which can be emitted via the transmitter or the speaker 23. In particular, the processor is capable of generating, in real time, a corresponding counter-sound with respect to the sound waves picked up by the microphone 25. In practice, efforts should be made to minimize the time lag between emissions and counter-noise.
Es sei angemerkt, dass die in der Figur 1 dargestellte Positionierung der Einrichtung 21 , zusammen mit der Positionierung des Prozessors 21 a oder des Senders bzw. Lautsprechers 23 und des Mikrofons 25 rein schematisch und beispielhaft ist. Es ist ebenfalls möglich, die vier Komponenten 21 , 21 a, 23 und 25 getrennt voneinander, an jeweils geeigneten Orten innerhalb des Gehäuses 40 zu positionieren. It should be noted that the positioning of the device 21 shown in Figure 1, together with the positioning of the processor 21 a or the transmitter or speaker 23 and the microphone 25 is purely schematic and exemplary. It is also possible to position the four components 21, 21 a, 23 and 25 separately from each other at respective suitable locations within the housing 40.

Claims

Ansprüche claims
1 . Elektrowerkzeug mit einem Elektromotor (14) zum Antrieb einer Werkzeugeinheit (10, 12), gekennzeichnet durch eine Einrichtung (21 ) zur Erzeugung destruktiver Interferenzen zur Verminderung von beim Betrieb auftretenden Schallemissionen. 1 . Electric tool having an electric motor (14) for driving a tool unit (10, 12), characterized by means (21) for generating destructive interference for reducing noise emissions occurring during operation.
2. Elektrowerkzeug nach Anspruch 1 , dadurch gekennzeichnet, dass die Einrichtung (21 ) einen Prozessor (21 a) und einen Sender und/oder eine Lautsprechereinheit (23) aufweist. 2. Power tool according to claim 1, characterized in that the device (21) has a processor (21 a) and a transmitter and / or a speaker unit (23).
3. Elektrowerkzeug nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Einrichtung (21 ) zur Erzeugung destruktiver Interferenzen Mittel zur Erzeugung destruktiver Interferenzen bezüglich vom Elektrowerkzeug erzeugter Schallwellen, welche vorbekannte Amplituden und/oder Frequenzen aufweisen, umfasst. 3. Power tool according to one of claims 1 or 2, characterized in that the means (21) for generating destructive interference means for generating destructive interference with respect to the power tool generated sound waves, which have known amplitudes and / or frequencies includes.
4. Elektrowerkzeug nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Einrichtung (21 ) zur Erzeugung destruktiver Interferenzen einen Sensor, insbesondere ein Mikrofon, und eine mit dem Sensor bzw. dem Mikrofon zusammenwirkende Prozessoreinheit aufweist. 4. Power tool according to one of the preceding claims, characterized in that the means (21) for generating destructive interference comprises a sensor, in particular a microphone, and a cooperating with the sensor or the microphone processor unit.
5. Elektrowerkzeug nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass es als Bohrmaschine, insbesondere Schlagbohrmaschine, Bohrhammer, Schlaghammer oder Akkubohrmaschine, oder als Sägewerkzeug oder als Schleifwerkzeug ausgebildet ist. 5. Power tool according to one of the preceding claims, characterized in that it is designed as a drill, in particular percussion drill, hammer drill, percussion hammer or Akkubohrmaschine, or as a sawing tool or as a grinding tool.
PCT/EP2010/065518 2009-12-15 2010-10-15 Power tool WO2011072908A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201080057235.4A CN102655989B (en) 2009-12-15 2010-10-15 Electric tool
EP10770790A EP2512748A1 (en) 2009-12-15 2010-10-15 Power tool
RU2012129662/02A RU2012129662A (en) 2009-12-15 2010-10-15 ELECTRIC TOOL

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009054648.0 2009-12-15
DE102009054648A DE102009054648A1 (en) 2009-12-15 2009-12-15 power tool

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EP4067004A1 (en) * 2021-03-30 2022-10-05 Andreas Stihl AG & Co. KG Method and apparatus with noise adjustment

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EP3610989A1 (en) * 2018-08-14 2020-02-19 Hilti Aktiengesellschaft Headset for active noise suppression, helmet comprising such a headset, system comprising such a headset and a hand-held machine tool

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CN102655989B (en) 2016-06-15
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EP2512748A1 (en) 2012-10-24
DE102009054648A1 (en) 2011-06-16

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