EP1379363B1 - Manual machine tool - Google Patents

Manual machine tool Download PDF

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Publication number
EP1379363B1
EP1379363B1 EP02727246A EP02727246A EP1379363B1 EP 1379363 B1 EP1379363 B1 EP 1379363B1 EP 02727246 A EP02727246 A EP 02727246A EP 02727246 A EP02727246 A EP 02727246A EP 1379363 B1 EP1379363 B1 EP 1379363B1
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EP
European Patent Office
Prior art keywords
electric motor
portable power
power tool
control unit
percussion mechanism
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
EP02727246A
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German (de)
French (fr)
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EP1379363A1 (en
Inventor
Gerhard Meixner
Oliver Zirn
Egbert Schneider
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1379363A1 publication Critical patent/EP1379363A1/en
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Publication of EP1379363B1 publication Critical patent/EP1379363B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/12—Means for driving the impulse member comprising a crank mechanism
    • B25D11/125—Means for driving the impulse member comprising a crank mechanism with a fluid cushion between the crank drive and the striking body
    • 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
    • B25D2250/131—Idling mode of tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • the invention relates to a hand tool, in particular a drill and / or chisel hammer, drivable in a housing of an electric motor Schlagtechnik over which an arranged in a tool holder insert tool is driven in a knocking manner, and with a sensor unit via which a characteristic for an idle position can be detected.
  • an idle spring can be completely dispensed with, for example, by a pressure sensor, a contact pressure of the insert tool is determined against an object to be processed, or by running an idle spring at least slightly and with a small force can, so that advantageously a small operating force to achieve a working position is sufficient.
  • the impact mechanism is advantageous interpretable exclusively on its impact function, and an idle function can be disregarded, resulting in constructive degrees of freedom.
  • the impact mechanism is robust by eliminating idle or vent holes executable, and it is an advantageous seal against dirt and lubricant loss can be achieved.
  • the solution according to the invention is basically applicable to all hand tool machines whose application tools are driven in a hammering manner, in particular in impact drills, rotary hammers, chisel hammers, etc.
  • all electric motors which appear to be suitable to a person skilled in the art can be actively decelerated via a special motor control unit, such as asynchronous motors, synchronous motors or direct current motors, etc., via a brake control.
  • the electric motor is particularly advantageously 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 braked 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.
  • the hammer mechanism can be braked with a separate brake unit, the active braking of the electric motor can be supported and a standstill of the electric motor or percussion mechanism can be achieved particularly quickly.
  • the separate brake unit can be designed in various ways, for example, this may be formed by a mechanical or an electromechanical unit, etc.
  • a drive piston of the percussion mechanism is decelerated to a standstill between 0.1 and 3 beat cycles of the percussion mechanism, whereby wear of the impact mechanism can be reduced and comfort can be increased, in particular by avoiding unnecessary vibrations.
  • the percussion mechanism has a pot piston
  • a cost-effective piston can be achieved in which a racket and the piston can be connected by friction. Due to the direct contact between the pot piston and the racket of the racket on the pot piston advantageous in the transition accelerated from an idle position to a working position in a short time and delayed by the inventive solution by the active braking of the electric motor in the transition from a working position to an idle position in a short time.
  • the solution according to the invention can also be used in percussion devices which have a piston guided in a cylinder or in a hammer tube.
  • a motor control unit is embodied at least partially in one piece with an already existing power control unit of the electric motor, it is advantageously possible to save components, installation space and weight.
  • the engine control unit can be implemented in one piece with a power control unit of the electric motor in a simple manner.
  • the sensor unit can have various sensors which appear suitable to a person skilled in the art, for example electronic, electromechanical and / or mechanical sensors, via which, however, in particular a contact force of the insert tool against an object to be machined and / or a position of the insert tool or a component moved with the insert tool should be detectable.
  • the sensor unit has at least one electronic sensor. This is small and easy to carry out and can be integrated to save space on small hand tool machines particularly advantageous.
  • the information from the sensor to the engine control unit can be transmitted via electrical lines, via radio, optically and / or mechanically, etc.
  • Fig. 1 shows a schematic representation of a partial section through a hammer drill with a drivable in a housing 10 by an electric motor 12 striking mechanism 14, wherein the electric motor 12 is formed by an electrically commutated motor.
  • a pinion 36 is integrally formed, which meshes with a mounted on a bearing pin 38 spur gear 40.
  • spur gear 40 On the spur gear 40, an eccentric pin 42 is fixed, via which a pot piston 24 of the percussion mechanism 14 can be driven.
  • a racket 26 is slidably mounted, which acts via an anvil 46 on the mounted in a tool holder 16 insert tool 18 or on a fixed in the tool holder 16 drill.
  • the hammer drill has a sensor unit 30, with an electronic sensor 20, via which a characteristic for an idle position can be detected.
  • the electric motor 12 and thus the percussion mechanism 14 can be actively braked via a motor control unit 22 when the idling position is detected, with the engine control unit 22 being largely integral with an already existing power control unit 28 of the electric motor 12.
  • the pot piston 24, the racket 26 and the striker 46 striking driven insert tool 18 from an object to be processed presses a non-illustrated idle spring in operative connection with the insert tool 18 and in the tool holder 16 axially displaceably mounted striker 46 in an initial position axially in the direction of the object to be processed.
  • the electronic sensor 20 of the sensor unit 30 fastened in the housing 10 in the area of the tool holder 16 detects an idle position or the neutral position of the striker 46 and sends a signal via a signal line 32 to an evaluation unit 48, which in turn sends a pulse via a signal line 44 to the engine control unit 22 forwards.
  • 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 counter to the direction of rotation of the shaft 34 and the pot piston 24 of the act Schlagtechniks 14 comes to a standstill after a detected idle position approx.
  • the electronic sensor 20 sends a signal via the signal line 32 to the evaluation unit 48 and this in turn sends a signal via the signal line 44 to the engine control unit 22, which causes a targeted, tuned to the present percussion 14 start-up of the electric motor 12.

Abstract

Manual machine tool, in particular a hammer drill and/or chipping hammer, comprising a striking train (14), driven by an electric motor (12) in a housing (10), by means of which an insert tool (18), arranged in a tool mounting (16), may be percussion driven and a sensor unit (30), by means of which a parameter for a neutral position is determined. The electric motor (12) and thus the striking train (14) may be actively braked by a motor control unit (22) with a recognised neutral position.

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 ein Bohrhammer, mit einem von einem Elektromotor antreibbaren Schlagwerk bekannt, bei dem eine im Antriebsstrang angeordnete Kupplung bei Erreichen einer von einem Sensor erfaßten vorgegebenen Bewegungsgröße selbständig ausrückt, und zwar zum Unterbrechen einer Schlagantriebstätigkeit des Schlagwerks in einer Leerlaufstellung. Als Bewegungsgröße wird eine auf einer Leerlaufstrecke befindliche Wegposition eines Schlagwerkteils oder eines Einsatzwerkzeugs erfaßt. Bei Verlassen dieser Wegposition rückt die Kupplung selbständig wieder ein. Der Sensor aktiviert bei Erreichen dieser Wegposition eine Steuereinrichtung, die ihrerseits einen Steuerimpuls auf einen elektromagnetischen Ausrück-Stellantrieb führt, der an der Kupplung angreift und diese ausrückt.From the EP 0 303 651 B2 is a hand tool, namely a hammer drill, with a drivable by an electric motor percussion known, in which a clutch arranged in the drive train on reaching a sensed by a sensor detected movement amount automatically depressed, namely for interrupting a Schlagantriebtät the percussion in an idle position. As a movement amount located on an idle stroke path position of a striking mechanism part or an insertion tool is detected. When leaving this position, the clutch engages again automatically. The sensor activates upon reaching this path position, a control device, which in turn leads a control pulse to an electromagnetic disengaging actuator which engages the clutch and disengages.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung geht aus von einer Handwerkzeugmaschine, insbesondere von einem Bohr- und/oder Meißelhammer, mit in einem Gehäuse von einem Elektromotor antreibbaren Schlagwerk, über das ein in einer Werkzeughalterung angeordnetes Einsatzwerkzeug schlagend antreibbar ist, und mit einer Sensoreinheit, über die eine Kenngröße für eine Leerlaufstellung erfaßbar ist.The invention relates to a hand tool, in particular a drill and / or chisel hammer, drivable in a housing of an electric motor Schlagwerk over which an arranged in a tool holder insert tool is driven in a knocking manner, and with a sensor unit via which a characteristic for an idle position can be detected.

Es wird vorgeschlagen, daß bei einer erkannten Leerlaufstellung über eine Motorsteuereinheit der Elektromotor und damit das Schlagwerk aktiv abbremsbar ist. Eine zusätzliche Leerlaufkupplung und eine Fangvorrichtung für einen Schläger können vermieden und zusätzliche Bauteile, Gewicht, Bauraum, Montageaufwand sowie Kosten können eingespart werden. Verschleißprobleme an einer zusätzlichen Leerlaufkupplung sind vermeidbar. Es kann konstruktiv einfach ein kurzer Leerlaufweg und dadurch bedingt eine kurze Bauweise der Handwerkzeugmaschine sowie ein geringer Verschleiß an der Werkzeughalterung erreicht werden.It is proposed that when the idling position is detected via an engine control unit, the electric motor and thus the striking mechanism can be actively braked. An additional idle clutch and a catcher for a racket can be avoided and additional components, weight, space, installation costs and costs can be saved. Wear problems on an additional idle clutch are avoidable. It can be structurally simple a short idle travel and thus a short design of the power tool and a low wear on the tool holder can be achieved.

Ferner kann ein hoher Komfort erzielt werden, und zwar insbesondere indem auf eine Leerlauffeder vollständig verzichtet werden kann, beispielsweise indem über einen Drucksensor eine Anpreßkraft des Einsatzwerkzeugs gegen einen zu bearbeitenden Gegenstand ermittelt wird, oder indem eine Leerlauffeder zumindest leicht und mit einer kleinen Stellkraft ausgeführt werden kann, so daß vorteilhaft eine kleine Betätigungskraft zur Erreichung einer Arbeitsstellung ausreicht.Furthermore, a high level of comfort can be achieved, in particular by an idle spring can be completely dispensed with, for example, by a pressure sensor, a contact pressure of the insert tool is determined against an object to be processed, or by running an idle spring at least slightly and with a small force can, so that advantageously a small operating force to achieve a working position is sufficient.

Das Schlagwerk ist vorteilhaft ausschließlich auf seine Schlagfunktion auslegbar, und eine Leerlauffunktion kann unberücksichtigt bleiben, wodurch sich konstruktive Freiheitsgrade ergeben. Das Schlagwerk ist robust durch den Verzicht auf Leerlauf- bzw. Entlüftungsbohrungen ausführbar, und es ist eine vorteilhafte Abdichtung gegen Schmutz und Schmiermittelverlust erreichbar.The impact mechanism is advantageous interpretable exclusively on its impact function, and an idle function can be disregarded, resulting in constructive degrees of freedom. The impact mechanism is robust by eliminating idle or vent holes executable, and it is an advantageous seal against dirt and lubricant loss can be achieved.

Aus der Leerlaufstellung kann ein gezieltes und schnelles Hochfahren des Schlagwerks realisiert werden, und das Anlaufverhalten kann durch ein entsprechendes Ansteuern des Elektromotors konstruktiv einfach auf das Schlagwerk abgestimmt werden. Die erfindungsgemäße Lösung ist grundsätzlich bei sämtlichen Handwerkzeugmaschinen einsetzbar, deren Einsatzwerkzeuge schlagend antreibbar sind, wie insbesondere bei Schlagbohrmaschinen, Bohrhämmern, Meißelhämmern usw.From the idle position, a targeted and fast startup of the percussion can be realized, and the startup behavior can be easily matched by a corresponding control of the electric motor on the percussion. The solution according to the invention is basically applicable to all hand tool machines whose application tools are driven in a hammering manner, in particular in impact drills, rotary hammers, chisel hammers, etc.

Grundsätzlich können sämtliche, dem Fachmann als geeignet erscheinende Elektromotoren über eine spezielle Motorsteuereinheit aktiv abgebremst werden, wie beispielsweise Asynchronmotoren, Synchronmotoren oder Gleichstrommotoren usw. über eine Bremssteuerung. Besonders vorteilhaft wird der Elektromotor jedoch 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.In principle, all electric motors which appear to be suitable to a person skilled in the art can be actively decelerated via a special motor control unit, such as asynchronous motors, synchronous motors or direct current motors, etc., via a brake control. However, the electric motor is particularly advantageously 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.

Ferner kann ein Anker des elektronisch kommutierten Elektromotors 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.Further, 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 braked 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.

Ist das Schlagwerk mit einer separaten Bremseinheit abbremsbar, kann das aktive Bremsen des Elektromotors unterstützt und ein Stillstand des Elektromotors bzw. des Schlagwerks besonders schnell erreicht werden. Die separate Bremseinheit kann verschiedenartig ausgeführt sein, beispielsweise kann diese von einer mechanischen oder einer elektromechanischen Einheit gebildet sein usw.If the hammer mechanism can be braked with a separate brake unit, the active braking of the electric motor can be supported and a standstill of the electric motor or percussion mechanism can be achieved particularly quickly. The separate brake unit can be designed in various ways, for example, this may be formed by a mechanical or an electromechanical unit, etc.

Besonders vorteilhaft ist ein Antriebskolben des Schlagwerks nach erkannter Leerlaufstellung zwischen 0,1 bis 3 Schlagtakten des Schlagwerks zum Stillstand abgebremst, wodurch ein Verschleiß des Schlagwerks reduziert und der Komfort gesteigert werden kann, und zwar insbesondere indem unnötige Vibrationen vermieden werden können.Particularly advantageously, a drive piston of the percussion mechanism is decelerated to a standstill between 0.1 and 3 beat cycles of the percussion mechanism, whereby wear of the impact mechanism can be reduced and comfort can be increased, in particular by avoiding unnecessary vibrations.

Weist das Schlagwerk einen Topfkolben auf, kann ein kostengünstiger Kolben erreicht werden, bei dem ein Schläger und der Kolben reibungstechnisch verbindbar sind. Durch den direkten Kontakt zwischen dem Topfkolben und dem Schläger kann der Schläger über den Topfkolben vorteilhaft beim Übergang von einer Leerlaufstellung in eine Arbeitsstellung in kurzer Zeit beschleunigt und mit der erfindungsgemäßen Lösung durch das aktive Abbremsen des Elektromotors beim Übergang von einer Arbeitsstellung in eine Leerlaufstellung in kurzer Zeit verzögert werden. Grundsätzlich ist die erfindungsgemäße Lösung jedoch auch bei Schlagwerken einsetzbar, die einen in einem Zylinder bzw. in einem Hammerrohr geführten Kolben aufweisen.If the percussion mechanism has a pot piston, a cost-effective piston can be achieved in which a racket and the piston can be connected by friction. Due to the direct contact between the pot piston and the racket of the racket on the pot piston advantageous in the transition accelerated from an idle position to a working position in a short time and delayed by the inventive solution by the active braking of the electric motor in the transition from a working position to an idle position in a short time. In principle, however, the solution according to the invention can also be used in percussion devices which have a piston guided in a cylinder or in a hammer tube.

Wird eine Motorsteuereinheit zumindest teilweise einstückig mit einer bereits vorhandenen Leistungssteuereinheit 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 unit of the electric motor, it is advantageously possible to save components, installation space and weight. 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.

Die Sensoreinheit kann verschiedene, dem Fachmann als geeignet erscheinende Sensoren aufweisen, beispielsweise elektronische, elektromechanische und/oder mechanische Sensoren, über die jedoch insbesondere eine Anpreßkraft des Einsatzwerkzeugs an einen zu bearbeitenden Gegenstand und/oder eine Wegposition des Einsatzwerkzeugs oder eines mit dem Einsatzwerkzeug bewegten Bauteils erfaßbar sein sollte. Besonders vorteilhaft weist die Sensoreinheit zumindest einen elektronischen Sensor auf. Dieser ist klein und leicht ausführbar und kann besonders vorteilhaft bei kleinen Handwerkzeugmaschinen platzsparend integriert werden. Die Informationen vom Sensor zur Motorsteuereinheit können über elektrische Leitungen, über Funk, optisch und/oder mechanisch übertragen werden usw.The sensor unit can have various sensors which appear suitable to a person skilled in the art, for example electronic, electromechanical and / or mechanical sensors, via which, however, in particular a contact force of the insert tool against an object to be machined and / or a position of the insert tool or a component moved with the insert tool should be detectable. Particularly advantageously, the sensor unit has at least one electronic sensor. This is small and easy to carry out and can be integrated to save space on small hand tool machines particularly advantageous. The information from the sensor to the engine control unit can be transmitted via electrical lines, via radio, optically and / or mechanically, 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 eine schematische Darstellung eines Teilschnitts durch einen Bohrhammer mit einem in einem Gehäuse 10 von einem Elektromotor 12 antreibbaren Schlagwerk 14, wobei der Elektromotor 12 von einem elektrisch kommutierten Motor gebildet ist. Fig. 1 shows a schematic representation of a partial section through a hammer drill with a drivable in a housing 10 by an electric motor 12 striking mechanism 14, wherein the electric motor 12 is formed by an electrically commutated motor.

An einem einer Rotationsachse eines Einsatzwerkzeugs 18 zugewandten Ende einer Welle 34 des Elektromotors 12 ist ein Ritzel 36 angeformt, das mit einem auf einem Lagerbolzen 38 gelagerten Stirnrad 40 kämmt. Auf dem Stirnrad 40 ist ein Exzenterzapfen 42 befestigt, über den ein Topfkolben 24 des Schlagwerks 14 antreibbar ist. Im Topfkolben 24 ist ein Schläger 26 verschiebbar gelagert, der über einen Döpper 46 auf das in einer Werkzeughalterung 16 befestigte Einsatzwerkzeug 18 bzw. auf einen in der Werkzeughalterung 16 befestigten Bohrer wirkt.On a rotational axis of an insert tool 18 facing the end of a shaft 34 of the electric motor 12, a pinion 36 is integrally formed, which meshes with a mounted on a bearing pin 38 spur gear 40. On the spur gear 40, an eccentric pin 42 is fixed, via which a pot piston 24 of the percussion mechanism 14 can be driven. In the pot piston 24, a racket 26 is slidably mounted, which acts via an anvil 46 on the mounted in a tool holder 16 insert tool 18 or on a fixed in the tool holder 16 drill.

Ferner besitzt der Bohrhammer eine Sensoreinheit 30, mit einem elektronischen Sensor 20, über den eine Kenngröße für eine Leerlaufstellung erfaßbar ist.Furthermore, the hammer drill has a sensor unit 30, with an electronic sensor 20, via which a characteristic for an idle position can be detected.

Erfindungsgemäß ist bei einer erkannten Leerlaufstellung der Elektromotor 12 und damit das Schlagwerk 14 über eine Motorsteuereinheit 22 aktiv abbremsbar, wobei die Motorsteuereinheit 22 weitgehend einstückig mit einer bereits vorhandenen Leistungssteuereinheit 28 des Elektromotors 12 ausgeführt ist.According to the invention, the electric motor 12 and thus the percussion mechanism 14 can be actively braked via a motor control unit 22 when the idling position is detected, with the engine control unit 22 being largely integral with an already existing power control unit 28 of the electric motor 12.

Wird das vom Elektromotor 12 über den Exzenterzapfen 42, den Topfkolben 24, den Schläger 26 und den Döpper 46 schlagend angetriebene Einsatzwerkzeug 18 von einem zu bearbeitenden Gegenstand abgehoben, drückt eine nicht näher dargestellte Leerlauffeder den mit dem Einsatzwerkzeug 18 in Wirkverbindung stehenden und in der Werkzeughalterung 16 axial verschiebbar gelagerten Döpper 46 in eine Ausgangsstellung axial in Richtung des zu bearbeitenden Gegenstands. Der im Bereich der Werkzeughalterung 16 im Gehäuse 10 befestigte elektronische Sensor 20 der Sensoreinheit 30 erfaßt eine Leerlaufstellung bzw. eine der Leerlaufstellung zugeordnete Wegposition des Döppers 46 und sendet ein Signal über eine Signalleitung 32 an eine Auswerteeinheit 48, die wiederum einen Impuls über eine Signalleitung 44 an die Motorsteuereinheit 22 weiterleitet.If lifted by the electric motor 12 via the eccentric pin 42, the pot piston 24, the racket 26 and the striker 46 striking driven insert tool 18 from an object to be processed, presses a non-illustrated idle spring in operative connection with the insert tool 18 and in the tool holder 16 axially displaceably mounted striker 46 in an initial position axially in the direction of the object to be processed. The electronic sensor 20 of the sensor unit 30 fastened in the housing 10 in the area of the tool holder 16 detects an idle position or the neutral position of the striker 46 and sends a signal via a signal line 32 to an evaluation unit 48, which in turn sends a pulse via a signal line 44 to the engine control unit 22 forwards.

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 34 wirken und der Topfkolben 24 des Schlagwerks 14 nach erkannter Leerlaufstellung ca. nach einem Schlagtakt zum Stillstand kommt.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 counter to the direction of rotation of the shaft 34 and the pot piston 24 of the act Schlagwerks 14 comes to a standstill after a detected idle position approx.

Wird das Einsatzwerkzeug 18 wieder gegen einen zu bearbeitenden Gegenstand gedrückt und der Döpper 46 aus der Leerlaufstellung in seine Arbeitsstellung verschoben, sendet der elektronische Sensor 20 ein Signal über die Signalleitung 32 an die Auswerteeinheit 48 und diese wiederum ein Signal über die Signalleitung 44 an die Motorsteuereinheit 22, die ein gezieltes, auf das vorliegende Schlagwerk 14 abgestimmtes Hochfahren des Elektromotors 12 veranlaßt.If the insert tool 18 is again pressed against an object to be processed and the striker 46 is moved from the neutral position to its working position, the electronic sensor 20 sends a signal via the signal line 32 to the evaluation unit 48 and this in turn sends a signal via the signal line 44 to the engine control unit 22, which causes a targeted, tuned to the present percussion 14 start-up of the electric motor 12.

Bezugszeichenreference numeral

1010
Gehäusecasing
1212
Elektromotorelectric motor
1414
Schlagwerkstriking mechanism
1616
Werkzeughalterungtool holder
1818
Einsatzwerkzeugapplication tool
2020
Sensorsensor
2222
MotorsteuereinheitEngine control unit
2424
Antriebskolbendrive piston
2626
Schlägerbat
2828
LeistungssteuereinheitPower control unit
3030
Sensoreinheitsensor unit
3232
Signalleitungsignal line
3434
Wellewave
3636
Ritzelpinion
3838
Lagerbolzenbearing bolt
4040
Stirnradspur gear
4242
Exzenterzapfeneccentric
4444
Signalleitungsignal line
4646
DöpperDöpper
4848
Auswerteeinheitevaluation

Claims (7)

  1. Portable power tool, in particular a hammer drill and/or rotary demolition hammer, having a percussion mechanism (14) which can be driven in a housing (10) by an electric motor (12) and via which an application tool (18) arranged in a tool holder (16) can be driven in a percussive manner, and having a sensor unit (30), via which a characteristic quantity for an idling position can be detected, characterized in that, if an idling position is detected, the electric motor (12) and thus the percussion mechanism (14) can be actively braked via a motor control unit (22).
  2. Portable power tool according to Claim 1, characterized in that the electric motor (12) is formed by an electronically commutated motor.
  3. Portable power tool according to Claim 1 or 2, characterized in that, after an idling position is detected, a drive piston (24) of the percussion mechanism (14) is braked to a stop between 0.1 and 3 percussion cycles of the percussion mechanism (14).
  4. Portable power tool according to one of the preceding claims, characterized in that the percussion mechanism (14) can be braked using a separate braking unit.
  5. Portable power tool according to one of the preceding claims, characterized in that the percussion mechanism (14) has a drive piston (24) formed by a pot-type piston.
  6. Portable power tool according to one of the preceding claims, characterized in that the motor control unit (22) is designed at least partly in one piece with a power control unit (28), already present, of the electric motor (12).
  7. Portable power tool according to one of the preceding claims, characterized in that the sensor unit (30) has at least one electronic sensor (20).
EP02727246A 2001-04-06 2002-03-19 Manual machine tool Expired - Lifetime EP1379363B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10117123A DE10117123A1 (en) 2001-04-06 2001-04-06 Hand tool
DE10117123 2001-04-06
PCT/DE2002/000982 WO2002081154A1 (en) 2001-04-06 2002-03-19 Manual machine tool

Publications (2)

Publication Number Publication Date
EP1379363A1 EP1379363A1 (en) 2004-01-14
EP1379363B1 true EP1379363B1 (en) 2008-05-28

Family

ID=7680587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02727246A Expired - Lifetime EP1379363B1 (en) 2001-04-06 2002-03-19 Manual machine tool

Country Status (6)

Country Link
US (1) US6843327B2 (en)
EP (1) EP1379363B1 (en)
JP (1) JP2004518552A (en)
CN (1) CN1262397C (en)
DE (2) DE10117123A1 (en)
WO (1) WO2002081154A1 (en)

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Also Published As

Publication number Publication date
DE50212320D1 (en) 2008-07-10
CN1262397C (en) 2006-07-05
US6843327B2 (en) 2005-01-18
DE10117123A1 (en) 2002-10-17
US20040003930A1 (en) 2004-01-08
CN1460047A (en) 2003-12-03
JP2004518552A (en) 2004-06-24
WO2002081154A1 (en) 2002-10-17
EP1379363A1 (en) 2004-01-14

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