EP2903785A1 - Procédé et dispositif permettant de faire fonctionner un outil électroportatif à mécanisme de percussion tangentielle - Google Patents

Procédé et dispositif permettant de faire fonctionner un outil électroportatif à mécanisme de percussion tangentielle

Info

Publication number
EP2903785A1
EP2903785A1 EP13774640.0A EP13774640A EP2903785A1 EP 2903785 A1 EP2903785 A1 EP 2903785A1 EP 13774640 A EP13774640 A EP 13774640A EP 2903785 A1 EP2903785 A1 EP 2903785A1
Authority
EP
European Patent Office
Prior art keywords
torque
electric motor
motor current
motor
tangential
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.)
Withdrawn
Application number
EP13774640.0A
Other languages
German (de)
English (en)
Inventor
Joachim Wörz
Michael Brandner
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP2903785A1 publication Critical patent/EP2903785A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
    • B25B23/1475—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers for impact wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/48—Measuring or detecting

Definitions

  • the present invention relates to a method and a device for operating a hand tool with a drivable by means of a drive shaft and an electric motor Tangentialtschwerk.
  • the invention further relates to a control device for a hand tool with such a device and such a hand tool, in particular an electric hand tool, such as an electric screwdriver or a hand-held drill.
  • a conventional hand tool machine with a tangential impactor such as a tangential impact driver
  • the rotational speed of the electric motor decreases from the time when the tangential impactor starts operating.
  • this is usually undesirable when the tangential impact driver is used for drilling, since a high rotational speed is beneficial during drilling. If the rotational speed is reduced, the time required for drilling is increased.
  • a conventional tangential impact driver for example, can not be used for cutting threads, since the corresponding cutting tool can be damaged by inserting the Tangentialtschtechniks. Accordingly, it is an object of the present invention to provide an improved method of operating a hand tool with a tangential impactor driven by a drive shaft and an electric motor.
  • a method for operating a hand tool with a drivable by means of a drive shaft and an electric motor Tangentialtschtechnik proposed.
  • the method includes adjusting an actual torque provided by the drive shaft as a function of a measured motor current of the Electric motor to a desired torque, wherein the target torque is smaller than a tripping torque of the tangential impact.
  • the term of adjustment includes controlling and regulating the actual torque to the desired torque.
  • the handheld power tool can be used in spite of the existing tangential impactor for application drilling, without the rotational speed of the motor being adversely reduced. It is thus also possible to use the hand tool for cutting thread application.
  • the actual torque is controlled to the target torque. This corresponds to the rules encompassed by setting the actual torque to the target torque.
  • the desired torque is determined in dependence on the measured motor current, wherein the actual torque is controlled to the specific target torque.
  • the tangential impactor is turned on when a value of the measured motor current exceeds a predetermined motor current threshold.
  • the tangential impactor can be turned on in response to the set motor current threshold despite the setting of the actual torque to the target torque.
  • the hand tool can thus be advantageously used for the application impact drilling.
  • the fixed motor current threshold is at least 15 amps.
  • the proposed 15 amperes provide a sufficiently high motor current threshold that prevents too early turn on of the tangential impactor while allowing for a timely turn on of the tangential impactor.
  • the setting of the actual torque is switched off to the target torque by a manual operation of a switch.
  • the switch can also be called a button. A user can thus deactivate the setting of the actual torque to the desired torque, so that the tangential impactor early and timely used in a corresponding application such as impact drilling, so that the time required for the application percussion drilling can be minimized.
  • the motor current is set to a value less than the predetermined motor current threshold.
  • the actual torque is advantageously reduced, so that the hand tool is used for applications for which the insertion of the Tangentialtschwerks is not desirable.
  • the setting of the actual torque to the target torque by driving the electric motor is carried out with a control signal.
  • the actuating signal is formed as a pulse width modulated signal.
  • PWM pulse width modulated
  • the electric motor is a brush motor. In a further embodiment, the electric motor is a brushless motor.
  • the device has an adjustment means.
  • the adjusting means is arranged to set an actual torque to a target torque in response to a measured motor current of the electric motor, the target torque being less than a tripping torque of the tangential impactor.
  • the setting means can be implemented in terms of hardware and / or software technology.
  • the adjustment means may be implemented as a device or as part of a device, for example as a computer or as a microprocessor.
  • the adjustment means may be implemented as a computer program product, as a function, as a routine, as part of a program code, or as an executable object.
  • control device for a handheld power tool wherein the control device integrates the above-described device for operating the handheld power tool.
  • the device is thus part of the control device, also referred to as a switch, of the handheld power tool.
  • the hand tool is in particular an electric hand tool, such as an electric screwdriver, a hand-held drill, a chisel hammer, a combination hammer, a cordless screwdriver, a circular saw or a saber saw.
  • an electric hand tool such as an electric screwdriver, a hand-held drill, a chisel hammer, a combination hammer, a cordless screwdriver, a circular saw or a saber saw.
  • FIG. 1 shows a schematic flow diagram of a method for operating a handheld power tool with a drivable by means of a drive shaft and an electric motor Tangentialtschtechnik.
  • FIG. 2 shows a schematic block diagram of an exemplary embodiment of a device for operating a handheld power tool with a tangential striking mechanism which can be driven by means of a drive shaft and an electric motor;
  • Fig. 3 is a schematic block diagram of a hand tool.
  • FIG. 1 shows a schematic flow diagram of a method for operating a handheld power tool 30 shown in FIG. 3 with a tangential impact mechanism 9 which can be driven by means of a drive shaft 5 and an electric motor 20.
  • step 101 a desired torque is determined which is smaller than a tripping torque of the tangential impact mechanism.
  • step 102 an actual torque provided by the drive shaft is set to the specific target torque depending on a measured motor current of the electric motor 20.
  • the proposed method is applicable, for example, to hand tool machines 30 with carbon brush motors.
  • the method is further applicable to hand tool machines 30 with brushless motors.
  • FIG. 2 shows a schematic block diagram of an exemplary embodiment of a device 10 for operating a handheld power tool 30 with a tangential impact mechanism 9 which can be driven by means of a drive shaft 5 and an electric motor 20.
  • FIG. 3 shows a block diagram of a handheld power tool 30, which comprises, in particular, the device 10 of FIG. 2, the electric motor 20 and the tangential impactor 9.
  • Fig. 3 shows an exemplary hand tool 30, e.g. an electric screwdriver.
  • the hand tool 30 has a tool holder 2, in which a tool 3 can be used or fastened.
  • the tools include, for example, a screwdriver bit, a drill, a grinding wheel and a saw blade.
  • the electric motor 20 drives the tool holder 2, here by way of example about a working axis 4 rotating.
  • a drive train between the tool holder 2 and the electric motor 20 may include a spindle or drive shaft 5, a transmission 6, and other components, e.g. a torque clutch or an eccentric included.
  • a user takes the hand tool 30 by pressing a button 7 in operation.
  • the button 7 is preferably arranged on a handle 8, with which the Users can hold and guide the power tool 30.
  • a controller 10 provides power to the electric motor 20 in response to the actuation.
  • An exemplary power source of the portable power tool 30 is a battery pack 40 having a plurality of secondary battery cells 41.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un outil électroportatif équipé d'un mécanisme de percussion tangentielle pouvant être entraîné au moyen d'un arbre d'entraînement et d'un moteur électrique. Selon le procédé, un couple réel produit par l'arbre d'entraînement est réglé à un couple de consigne en fonction d'un courant de moteur mesuré, le couple de consigne étant inférieur à un couple de déclenchement du mécanisme de percussion tangentielle.
EP13774640.0A 2012-10-08 2013-10-07 Procédé et dispositif permettant de faire fonctionner un outil électroportatif à mécanisme de percussion tangentielle Withdrawn EP2903785A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201210218300 DE102012218300A1 (de) 2012-10-08 2012-10-08 Verfahren und Vorrichtung zum Betreiben einer Handwerkzeugmaschine mit einem Tangentialschlagwerk
PCT/EP2013/070778 WO2014056820A1 (fr) 2012-10-08 2013-10-07 Procédé et dispositif permettant de faire fonctionner un outil électroportatif à mécanisme de percussion tangentielle

Publications (1)

Publication Number Publication Date
EP2903785A1 true EP2903785A1 (fr) 2015-08-12

Family

ID=49328512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13774640.0A Withdrawn EP2903785A1 (fr) 2012-10-08 2013-10-07 Procédé et dispositif permettant de faire fonctionner un outil électroportatif à mécanisme de percussion tangentielle

Country Status (6)

Country Link
US (1) US10065297B2 (fr)
EP (1) EP2903785A1 (fr)
JP (1) JP2015535753A (fr)
CN (1) CN104781048A (fr)
DE (1) DE102012218300A1 (fr)
WO (1) WO2014056820A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015061370A1 (fr) 2013-10-21 2015-04-30 Milwaukee Electric Tool Corporation Adaptateur pour dispositifs d'outil électrique
EP3228423A1 (fr) * 2016-04-06 2017-10-11 HILTI Aktiengesellschaft Comportement de commutation optimise par application d'un dispositif d'accouplement a patinage electronique
EP4263138A1 (fr) * 2020-12-18 2023-10-25 Black & Decker Inc. Outils à percussion et modes de commande

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038084A (en) * 1990-08-15 1991-08-06 Wing Thomas W Drill motor control
US5440215A (en) * 1993-07-06 1995-08-08 Black & Decker Inc. Electrical power tool having a motor control circuit for increasing the effective torque output of the power tool
EP0734116B1 (fr) * 1995-03-24 2000-09-20 Marquardt GmbH Procédé et dispositif pour le pilotage d'un moteur électrique
US6536536B1 (en) * 1999-04-29 2003-03-25 Stephen F. Gass Power tools
DE10023174A1 (de) * 2000-05-11 2001-11-22 Bosch Gmbh Robert Werkzeugmaschine, insbesondere Handwerkzeugmaschine
EP1867438A3 (fr) * 2000-11-17 2009-01-14 Makita Corporation Outil électrique d'impact
ITPN20030020A1 (it) * 2003-03-12 2004-09-13 Bordignon Simone Maschiatore elettromeccanico a comando elettronico.
DE10318798B4 (de) * 2003-04-25 2006-01-26 Robert Bosch Gmbh Bohrgerät
JP4400519B2 (ja) * 2005-06-30 2010-01-20 パナソニック電工株式会社 インパクト回転工具
US8505649B2 (en) * 2005-08-29 2013-08-13 Demain Technology Pty Ltd. Power tool
WO2009038230A1 (fr) * 2007-09-21 2009-03-26 Hitachi Koki Co., Ltd. Outil à percussion
JP5376392B2 (ja) * 2008-02-14 2013-12-25 日立工機株式会社 電動工具
DE102009002479B4 (de) * 2009-04-20 2015-02-19 Hilti Aktiengesellschaft Schlagschrauber und Steuerungsverfahren für einen Schlagschrauber
JP2013188812A (ja) * 2012-03-13 2013-09-26 Hitachi Koki Co Ltd インパクト工具
JP2014069264A (ja) * 2012-09-28 2014-04-21 Hitachi Koki Co Ltd 電動工具
CN104608100B (zh) * 2013-11-04 2017-04-19 南京德朔实业有限公司 一种多用电动工具及其控制方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014056820A1 *

Also Published As

Publication number Publication date
DE102012218300A1 (de) 2014-04-10
WO2014056820A1 (fr) 2014-04-17
CN104781048A (zh) 2015-07-15
US20150246435A1 (en) 2015-09-03
US10065297B2 (en) 2018-09-04
JP2015535753A (ja) 2015-12-17

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