EP1379362B1 - Hand-held machine tool - Google Patents

Hand-held machine tool Download PDF

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Publication number
EP1379362B1
EP1379362B1 EP02708227A EP02708227A EP1379362B1 EP 1379362 B1 EP1379362 B1 EP 1379362B1 EP 02708227 A EP02708227 A EP 02708227A EP 02708227 A EP02708227 A EP 02708227A EP 1379362 B1 EP1379362 B1 EP 1379362B1
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EP
European Patent Office
Prior art keywords
electric motor
housing
tool
protective device
detected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02708227A
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German (de)
French (fr)
Other versions
EP1379362A1 (en
Inventor
Peter Nadig
Oliver Zirn
Ludwig Thome
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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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
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/003—Clutches specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • 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
    • B25D2250/195—Regulation means
    • B25D2250/205—Regulation means for torque
    • 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

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • a hand tool namely a hand-held drill with a housing arranged in an electric motor known, via which an arranged in a tool holder insert tool or a drill is driven in rotation.
  • the hand tool has a protective device with which a so-called uncontrolled blocking case of the insert tool can be detected via a sensor and a drive of the insert tool can be prevented.
  • An uncontrolled lock case occurs when the insert tool jams in the workpiece to be machined, the reaction torque acting on the housing exceeds a holding force of an operator, and the housing uncontrollably at a certain angular velocity and over a certain Angular range rotates about an axis. If the holding force of the operator is greater than the present reaction torque or if the operator holds the power tool during a blocking case, there is a so-called controlled blocking case.
  • the protective device of the EP 0 303 651 B2 known hand tool has a arranged in a drive train of the power tool clutch for interrupting the rotary drive activity in an uncontrolled blocking case. Further, the protective device has a holding device between the coupling and the insert tool, via which the drive train is connected to the housing in an uncontrolled blocking case.
  • the holding device is formed by an electrically releasable brake.
  • a hand tool according to the preamble of claim 1 is made EP 666148 A1 known.
  • the invention relates to a hand tool with an electric motor arranged in a housing, via which an insert tool arranged in a tool holder is driven in rotation, and with a protective device with a sensor unit via a characteristic for an uncontrolled blocking case of the insert detected and the housing in his movement is braked.
  • the protective device is at least partially formed by a motor control unit, via which the electric motor can be actively braked when the uncontrolled blocking event of the insertion tool is detected.
  • An additional Brake or blocking unit can be completely avoided or particularly space-saving and easily performed. Additional components, weight, installation space, assembly costs and costs can be saved. With the structurally simple protection device, resetting and wear problems on an additional brake unit can be avoided.
  • the protective device is basically used in all hand tooling machines, their tools are driven in rotation, such as angular and eccentric grinders, circular saws, chainsaws, etc., and especially in hand drills, impact drills and drills.
  • the electric motor is formed by an electronically commutated motor.
  • the brushless, electronically commutated motors in particular reluctance motors, are particularly overloadable and can be loaded for a short time with a large torque and thus with a large braking torque. A large current can flow without the danger of a brush fire.
  • An armature of the electronically commutated electric motor may be implemented with an armature winding having an overall lower mass due to a missing armature winding compared to an armature of a conventional electric motor.
  • the armature of the electronically commutated electric motor thereby stores during operation a lower rotational energy and can be decelerated quickly with little energy.
  • the electronically commutated electric motor can advantageously be braked with a large DC link capacitor or with a brake chopper in a brake circuit.
  • a motor control unit is embodied at least partially in one piece with an already existing power control of the electric motor, components, installation space and weight can advantageously be saved.
  • the engine control unit can be implemented in one piece with a power control unit of the electric motor in a simple manner.
  • the housing can advantageously be braked in an uncontrolled blocking event with a low engine load.
  • the separate brake unit can be designed in various ways, for example, this may be formed by a mechanical or an electromechanical unit, etc.
  • the sensor unit has an electronic acceleration sensor, via which an angular velocity and an angular acceleration of the housing as well as an angle range swept by the housing can be detected.
  • Sensor for engine control unit can be transmitted via electrical lines, via radio, optical and / or mechanical, etc.
  • Fig. 1 shows a partial section through a hammer drill with an arranged in a housing 10 electric motor 12, which is formed by an electronically commutated motor.
  • electric motor 12 Above the electric motor 12 is a tool holder 14 mounted in an insert tool 16 and a drill rotatably driven.
  • the hammer drill has a protective device 18, with a sensor unit 20 a characteristic for an uncontrolled blocking case of the insert tool 16 can be detected and the housing 10 is braked in its movement.
  • the protective device 18 is partially formed by a motor control unit 22, via which the electric motor 12 can be braked in the event of a detected uncontrolled blocking event of the insertion tool 16.
  • the engine control unit 22 is largely in one piece with an existing power control unit 24 of the electric motor 12 executed.
  • a pinion 28 is formed, which meshes with a mounted on a bearing pin 44 spur gear 30.
  • a pinion 32 is integrally formed, which meshes with a arranged on a drill spindle 34 ring gear 36.
  • the tool holder 14 is driven.
  • the engine control unit 22 causes an active braking of the electric motor 12, in such a way that electromagnetically generated forces of the electric motor 12 against the direction of rotation of the shaft 26 act.
  • the motor control unit 22 is adjusted in such a way or generated via the electric motor 12 a braking torque in size, that the housing 10 and the rotary hammer after a swept angle range less than 30 ° comes to a standstill and a threat to the operator can be excluded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

The invention relates to a hand-held machine tool, comprising an electric motor (12) mounted in a housing (10) via which a tool bit (16) disposed in a tool holder (14) can be rotatably driven, and a protective device (18) by which a characteristic value for an uncontrolled blocking of the tool bit (16) can be detected by a sensor unit (20) and the housing (10) can be slowed down in its motion. The invention is further characterized in that the protective device (18) is at least partially configured by a motor control unit (22) via which the electric motor (12) can be actively slowed down when an uncontrolled blocking of the tool bit (16) is detected.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.

Aus der EP 0 303 651 B2 ist eine Handwerkzeugmaschine, und zwar eine handgeführte Bohrmaschine mit einem in einem Gehäuse angeordneten Elektromotor bekannt, über den ein in einer Werkzeughalterung angeordnetes Einsatzwerkzeug bzw. ein Bohrer rotierend antreibbar ist. Die Handwerkzeugmaschine besitzt eine Schutzvorrichtung, mit der über einen Sensor ein sogenannter unbeherrschter Blockierfall des Einsatzwerkzeugs feststellbar und ein Antrieb des Einsatzwerkzeugs unterbindbar ist.From the EP 0 303 651 B2 is a hand tool, namely a hand-held drill with a housing arranged in an electric motor known, via which an arranged in a tool holder insert tool or a drill is driven in rotation. The hand tool has a protective device with which a so-called uncontrolled blocking case of the insert tool can be detected via a sensor and a drive of the insert tool can be prevented.

Ein unbeherrschter Blockierfall liegt vor, wenn sich das Einsatzwerkzeug im zu bearbeitenden Werkstück verklemmt, das am Gehäuse wirkende Reaktionsdrehmoment eine Haltekraft eines Bedieners übersteigt, und das Gehäuse sich unkontrolliert mit einer bestimmten Winkelgeschwindigkeit und über einen bestimmten Winkelbereich um eine Achse dreht. Ist die Haltekraft des Bedieners größer als das vorliegende Reaktionsdrehmoment bzw. hält der Bediener die Handwerkzeugmaschine während eines Blockierfalls fest, liegt ein sogenannter beherrschter Blockierfall vor.An uncontrolled lock case occurs when the insert tool jams in the workpiece to be machined, the reaction torque acting on the housing exceeds a holding force of an operator, and the housing uncontrollably at a certain angular velocity and over a certain Angular range rotates about an axis. If the holding force of the operator is greater than the present reaction torque or if the operator holds the power tool during a blocking case, there is a so-called controlled blocking case.

Die Schutzvorrichtung der aus der EP 0 303 651 B2 bekannten Handwerkzeugmaschine besitzt eine in einem Antriebsstrang der Handwerkzeugmaschine angeordnete Kupplung zur Unterbrechung der Drehantriebstätigkeit bei einem unbeherrschten Blockierfall. Ferner besitzt die Schutzvorrichtung eine Halteeinrichtung zwischen der Kupplung und dem Einsatzwerkzeug, über die der Antriebsstrang mit dem Gehäuse in einem unbeherrschten Blockierfall verbunden wird. Die Halteeinrichtung wird von einer elektrisch auslösbaren Bremse gebildet.The protective device of the EP 0 303 651 B2 known hand tool has a arranged in a drive train of the power tool clutch for interrupting the rotary drive activity in an uncontrolled blocking case. Further, the protective device has a holding device between the coupling and the insert tool, via which the drive train is connected to the housing in an uncontrolled blocking case. The holding device is formed by an electrically releasable brake.

Eine Handwerkzeugmaschine gemäß den Oberbegriff des Anspruchs 1 ist aus EP 666148 A1 bekannt.A hand tool according to the preamble of claim 1 is made EP 666148 A1 known.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung geht aus von einer Handwerkzeugmaschine mit einem in einem Gehäuse angeordneten Elektromotor, über den ein in einer Werkzeughalterung angeordnetes Einsatzwerkzeug rotierend antreibbar ist, und mit einer Schutzvorrichtung, mit der über eine Sensoreinheit eine Kenngröße für einen unbeherrschten Blockierfall des Einsatzwerkzeugs erfaßbar und das Gehäuse in seiner Bewegung bremsbar ist.The invention relates to a hand tool with an electric motor arranged in a housing, via which an insert tool arranged in a tool holder is driven in rotation, and with a protective device with a sensor unit via a characteristic for an uncontrolled blocking case of the insert detected and the housing in his movement is braked.

Es wird vorgeschlagen, daß die Schutzvorrichtung zumindest teilweise von einer Motorsteuereinheit gebildet ist, über die bei erkanntem unbeherrschten Blockierfall des Einsatzwerkzeugs der Elektromotor aktiv abbremsbar ist. Eine zusätzliche Brems- oder Blockiereinheit kann vollständig vermieden oder besonders platzsparend und leicht ausgeführt werden. Zusätzliche Bauteile, Gewicht, Bauraum, Montageaufwand sowie Kosten können eingespart werden. Mit der konstruktiv einfachen Schutzvorrichtung sind Rücksetz- und Verschleißprobleme an einer zusätzlichen Bremseinheit vermeidbar. Die Schutzvorrichtung ist grundsätzlich bei sämtlichen Handwerkzeugmaschinen einsetzbar, deren Einsatzwerkzeuge rotierend antreibbar sind, wie z.B. bei Winkel- und Exzenterschleifern, Kreissägen, Kettensägen usw. sowie insbesondere bei Handbohrmaschinen, Schlagbohrmaschinen und Bohrhämmern.It is proposed that the protective device is at least partially formed by a motor control unit, via which the electric motor can be actively braked when the uncontrolled blocking event of the insertion tool is detected. An additional Brake or blocking unit can be completely avoided or particularly space-saving and easily performed. Additional components, weight, installation space, assembly costs and costs can be saved. With the structurally simple protection device, resetting and wear problems on an additional brake unit can be avoided. The protective device is basically used in all hand tooling machines, their tools are driven in rotation, such as angular and eccentric grinders, circular saws, chainsaws, etc., and especially in hand drills, impact drills and drills.

Der Elektromotor wird von einem elektronisch kommutierten Motor gebildet. Die bürstenlosen, elektronisch kommutierten Motoren, insbesondere Reluktanzmotoren, sind besonders überlastfähig und können kurzzeitig mit einem großen Drehmoment und damit mit einem großen Bremsmoment belastet werden. Es kann ein großer Strom fließen, ohne daß eine Gefahr eines Bürstenfeuers besteht.The electric motor is formed by an electronically commutated motor. The brushless, electronically commutated motors, in particular reluctance motors, are particularly overloadable and can be loaded for a short time with a large torque and thus with a large braking torque. A large current can flow without the danger of a brush fire.

Ein Anker des elektronisch kommutierten Elektromotors kann aufgrund einer fehlenden Ankerwicklung im Vergleich zu einem Anker eines herkömmlichen Elektromotors mit einer Ankerwicklung mit einer insgesamt geringeren Masse ausgeführt werden. Der Anker des elektronisch kommutierten Elektromotors speichert dadurch während des Betriebs eine geringere Rotationsenergie und kann mit wenig Energie schnell abgebremst werden. Der elektronisch kommutierte Elektromotor kann vorteilhaft mit einem großen Zwischenkreiskondensator oder mit einem Bremschopper in einer Bremsbeschaltung abgebremst werden.An armature of the electronically commutated electric motor may be implemented with an armature winding having an overall lower mass due to a missing armature winding compared to an armature of a conventional electric motor. The armature of the electronically commutated electric motor thereby stores during operation a lower rotational energy and can be decelerated quickly with little energy. The electronically commutated electric motor can advantageously be braked with a large DC link capacitor or with a brake chopper in a brake circuit.

Wird eine Motorsteuereinheit zumindest teilweise einstückig mit einer bereits vorhandenen Leistungssteuerung des Elektromotors ausgeführt, können vorteilhaft Bauteile, Bauraum und Gewicht eingespart werden. Besonders bei elektronisch kommutierten Motoren kann in einfacher Weise die Motorsteuereinheit einstückig mit einer Leistungssteuereinheit des Elektromotors ausgeführt werden.If a motor control unit is embodied at least partially in one piece with an already existing power control of the electric motor, components, installation space and weight can advantageously be saved. Particularly in the case of electronically commutated motors, the engine control unit can be implemented in one piece with a power control unit of the electric motor in a simple manner.

Wird die Motorsteuereinheit mit einer kleinen, platzsparenden, separaten Bremseinheit kombiniert, kann mit einer geringen Motorbelastung das Gehäuse in einem unbeherrschten Blokkierfall vorteilhaft abgebremst werden. Die separate Bremseinheit kann verschiedenartig ausgeführt sein, beispielsweise kann diese von einer mechanischen oder einer elektromechanischen Einheit gebildet sein usw.If the engine control unit is combined with a small, space-saving, separate brake unit, the housing can advantageously be braked in an uncontrolled blocking event with a low engine load. The separate brake unit can be designed in various ways, for example, this may be formed by a mechanical or an electromechanical unit, etc.

Die Sensoreinheit weist einen elektronischen Beschleunigungssensor, über den eine Winkelgeschwindigkeit und eine Winkelbeschleunigung des Gehäuses sowie ein vom Gehäuse überstrichener Winkelbereich erfaßbar sind auf. Sensor zur Motorsteuereinheit können über elektrische Leitungen, über Funk, optisch und/oder mechanisch übertragen werden usw.The sensor unit has an electronic acceleration sensor, via which an angular velocity and an angular acceleration of the housing as well as an angle range swept by the housing can be detected. Sensor for engine control unit can be transmitted via electrical lines, via radio, optical and / or mechanical, etc.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Fig. 1 zeigt einen Teilschnitt durch einen Bohrhammer mit einem in einem Gehäuse 10 angeordneten Elektromotor 12, der von einem elektronisch kommutierten Motor gebildet ist. Ober den Elektromotor 12 ist ein in einer Werkzeughalterung 14 befestigtes Einsatzwerkzeug 16 bzw. ein Bohrer rotierend antreibbar. Ferner besitzt der Bohrhammer eine Schutzvorrichtung 18, mit der über eine Sensoreinheit 20 eine Kenngröße für einen unbeherrschten Blockierfall des Einsatzwerkzeugs 16 erfaßbar und das Gehäuse 10 in seiner Bewegung bremsbar ist. Die Schutzvorrichtung 18 ist erfindungsgemäß teilweise von einer Motorsteuereinheit 22 gebildet, über die bei einem erkannten unbeherrschten Blockierfall des Einsatzwerkzeugs 16 der Elektromotor 12 abbremsbar ist. Die Motorsteuereinheit 22 ist weitgehend einstückig mit einer bereits vorhandenen Leistungssteuereinheit 24 des Elektromotors 12 ausgeführt. Fig. 1 shows a partial section through a hammer drill with an arranged in a housing 10 electric motor 12, which is formed by an electronically commutated motor. Above the electric motor 12 is a tool holder 14 mounted in an insert tool 16 and a drill rotatably driven. Furthermore, the hammer drill has a protective device 18, with a sensor unit 20 a characteristic for an uncontrolled blocking case of the insert tool 16 can be detected and the housing 10 is braked in its movement. According to the invention, the protective device 18 is partially formed by a motor control unit 22, via which the electric motor 12 can be braked in the event of a detected uncontrolled blocking event of the insertion tool 16. The engine control unit 22 is largely in one piece with an existing power control unit 24 of the electric motor 12 executed.

An einem einer Rotationsachse des Einsatzwerkzeugs 16 zugewandten Ende einer Welle 26 des Elektromotors 12 ist ein Ritzel 28 angeformt, das mit einem auf einem Lagerbolzen 44 gelagerten Stirnrad 30 kämmt. An einem der Rotationsachse zugewandten Ende des Lagerbolzens 44 ist ein Ritzel 32 angeformt, das mit einem auf einer Bohrspindel 34 angeordneten Tellerrad 36 kämmt. Über die Bohrspindel 34 ist die Werkzeughalterung 14 antreibbar.On a rotational axis of the insert tool 16 facing the end of a shaft 26 of the electric motor 12, a pinion 28 is formed, which meshes with a mounted on a bearing pin 44 spur gear 30. At one of the rotational axis facing the end of the bearing pin 44, a pinion 32 is integrally formed, which meshes with a arranged on a drill spindle 34 ring gear 36. About the drill spindle 34, the tool holder 14 is driven.

Wird das von der Bohrspindel 34 angetriebene Einsatzwerkzeug 16 blockiert und ist eine Haltekraft eines Bedieners an zwei Haltegriffen 38, 40 des Bohrhammers kleiner als ein entstehendes Reaktionsdrehmoment am Gehäuse 10, wird ein Drehmoment, ausgehend vom Elektromotor 12, über die Welle 26, die Zahnräder 28, 30, 32, 36 und die Bohrspindel 34 an das Gehäuse 10 übertragen, und das Gehäuse 10 wird entgegen der ursprünglichen Drehbewegung des Einsatzwerkzeugs 16 mit einer Drehbewegung um die Rotationsachse des Einsatzwerkzeugs 16 unkontrolliert beschleunigt. Diese Drehbewegung wird von der Sensoreinheit 20 mit einem elektronischen Beschleunigungssensor 42 erfaßt und mit einer Auswerteeinheit 46 ausgewertet. Liegt eine bestimmte Winkelbeschleunigung und ein bestimmter überstrichener Winkelbereich vor, wird von der Auswerteeinheit 46 ein Impuls an die Motorsteuereinheit 22 weitergeleitet.If the driven by the drill spindle 34 insert tool 16 is blocked and a holding force of an operator on two handles 38, 40 of the hammer smaller than a resulting reaction torque on the housing 10, a torque, starting from the electric motor 12, via the shaft 26, the gears 28th , 30, 32, 36 and the drill spindle 34 are transmitted to the housing 10, and the housing 10 is accelerated uncontrolled against the original rotational movement of the insert tool 16 with a rotational movement about the axis of rotation of the insert tool 16. This rotational movement is detected by the sensor unit 20 with an electronic acceleration sensor 42 and evaluated by an evaluation unit 46. If there is a certain angular acceleration and a certain swept angle range, the evaluation unit 46 sends a pulse to the motor control unit 22.

Die Motorsteuereinheit 22 veranlaßt ein aktives Bremsen des Elektromotors 12, und zwar in der Weise, daß elektromagnetisch erzeugte Kräfte des Elektromotors 12 entgegen der Drehrichtung der Welle 26 wirken. Die Motorsteuereinheit 22 ist in der Weise eingestellt bzw. erzeugt über den Elektromotor 12 ein Bremsmoment in der Größe, daß das Gehäuse 10 bzw. der Bohrhammer nach einem überstrichenen Winkelbereich kleiner als 30° zum Stillstand kommt und eine Gefährdung des Bedieners ausgeschlossen werden kann.The engine control unit 22 causes an active braking of the electric motor 12, in such a way that electromagnetically generated forces of the electric motor 12 against the direction of rotation of the shaft 26 act. The motor control unit 22 is adjusted in such a way or generated via the electric motor 12 a braking torque in size, that the housing 10 and the rotary hammer after a swept angle range less than 30 ° comes to a standstill and a threat to the operator can be excluded.

Bezugszeichenreference numeral

1010
Gehäusecasing
1212
Elektromotorelectric motor
1414
Werkzeughalterungtool holder
1616
Einsatzwerkzeugapplication tool
1818
Schutzvorrichtungguard
2020
Sensoreinheitsensor unit
2222
MotorsteuereinheitEngine control unit
2424
LeistungssteuereinheitPower control unit
2626
Wellewave
2828
Ritzelpinion
3030
Stirnradspur gear
3232
Ritzelpinion
3434
BohrspindelSpindle
3636
Tellerradcrown
3838
Haltegriffhandle
4040
Haltegriffhandle
4242
Sensorsensor
4444
Lagerbolzenbearing bolt
4646
Auswerteeinheitevaluation

Claims (2)

  1. Portable power tool comprising an electric motor (12) which is arranged in a housing (10) and via which an application tool (16) arranged in a tool holder (14) can be rotationally driven, and comprising a protective device (18) with which a characteristic variable for an uncontrolled blocking case of the application tool (16) can be detected via a sensor unit (20) and the housing (10) can be braked in its movement, wherein the sensor unit (20) has at least one sensor which is designed as an electronic acceleration sensor (42) and via which an angular velocity and an angular acceleration of the housing (10) and an angular range covered by the housing (10) can be detected, and wherein the protective device (18) comprises an evaluating unit (46) which evaluates a rotary movement detected by the acceleration sensor (42) of the sensor unit (20), wherein the electric motor (12) is formed by an electronically commutated motor, characterized in that the protective device (18) is formed at least partly by a motor control unit (22), via which, when an uncontrolled blocking case of the application tool (16) is detected, the electric motor (12) can be actively braked, specifically by the electric motor (12) generating an electromagnetic force which acts against the direction of rotation of the application tool (16), wherein the evaluating unit (46) transmits an impulse to the motor control unit (22) when a certain angular acceleration is present and when a certain angular range is covered.
  2. Portable power tool according to Claim 1, characterized in that the protective device has a separate braking unit.
EP02708227A 2001-04-06 2002-02-09 Hand-held machine tool Expired - Lifetime EP1379362B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10117121 2001-04-06
DE10117121A DE10117121A1 (en) 2001-04-06 2001-04-06 Hand tool
PCT/DE2002/000477 WO2002081153A1 (en) 2001-04-06 2002-02-09 Hand-held machine tool

Publications (2)

Publication Number Publication Date
EP1379362A1 EP1379362A1 (en) 2004-01-14
EP1379362B1 true EP1379362B1 (en) 2011-05-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02708227A Expired - Lifetime EP1379362B1 (en) 2001-04-06 2002-02-09 Hand-held machine tool

Country Status (6)

Country Link
US (1) US7055620B2 (en)
EP (1) EP1379362B1 (en)
JP (1) JP2004518551A (en)
CN (1) CN1304172C (en)
DE (1) DE10117121A1 (en)
WO (1) WO2002081153A1 (en)

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US8286723B2 (en) 2010-01-07 2012-10-16 Black & Decker Inc. Power screwdriver having rotary input control
US8418778B2 (en) 2010-01-07 2013-04-16 Black & Decker Inc. Power screwdriver having rotary input control
USRE44311E1 (en) 2004-10-20 2013-06-25 Black & Decker Inc. Power tool anti-kickback system with rotational rate sensor

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DE10316844A1 (en) * 2003-04-11 2004-11-04 Hilti Ag Control of an electric hand machine tool
US7395871B2 (en) * 2003-04-24 2008-07-08 Black & Decker Inc. Method for detecting a bit jam condition using a freely rotatable inertial mass
DE10353013A1 (en) * 2003-11-13 2005-06-16 Robert Bosch Gmbh Hand tool
US7270591B2 (en) * 2004-04-13 2007-09-18 Black & Decker Inc. Electric sander and motor control therefor
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EP1379362A1 (en) 2004-01-14
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WO2002081153A1 (en) 2002-10-17
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DE10117121A1 (en) 2002-10-17
US7055620B2 (en) 2006-06-06

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