EP2960021A1 - Machine-outil portative et procédé de commande - Google Patents

Machine-outil portative et procédé de commande Download PDF

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Publication number
EP2960021A1
EP2960021A1 EP14174696.6A EP14174696A EP2960021A1 EP 2960021 A1 EP2960021 A1 EP 2960021A1 EP 14174696 A EP14174696 A EP 14174696A EP 2960021 A1 EP2960021 A1 EP 2960021A1
Authority
EP
European Patent Office
Prior art keywords
side wheel
drive
tool
rotational speed
control method
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Withdrawn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
EP14174696.6A
Other languages
German (de)
English (en)
Inventor
Erwin Manschitz
Walter Wissmach
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
Priority to EP14174696.6A priority Critical patent/EP2960021A1/fr
Priority to EP15731912.0A priority patent/EP3160689B1/fr
Priority to US15/321,982 priority patent/US10751866B2/en
Priority to CN201580031188.9A priority patent/CN106457541A/zh
Priority to PCT/EP2015/064353 priority patent/WO2015197753A1/fr
Publication of EP2960021A1 publication Critical patent/EP2960021A1/fr
Priority to US16/517,317 priority patent/US11123854B2/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • 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
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • 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 present invention relates to a hand tool machine having a lock body coupling for interrupting a rotary drive of a tool.
  • a hand tool has a tool holder for receiving a tool along a working axis, a motor and a blocking body coupling.
  • the lock body coupling has a drive-side wheel and a driven-side wheel and a number N of locking bodies arranged between the drive-side wheel and the driven-side wheel.
  • the locking bodies are movable relative to one of the wheels.
  • a spring force holds the lock bodies in engagement with the one wheel for transmitting torque from the drive-side wheel to the driven-side wheel.
  • the movable lock bodies interrupt the transmission of the torque.
  • a sensor serves to record a measurement signal as a measure of accelerations within the handheld power tool.
  • a bandwidth filter has a passband in which a frequency is equal to the product of the number of revolutions of the drive-side wheel with the number N of the blocking bodies.
  • An evaluation unit is supplied with the measurement signal filtered by the bandwidth filter. The evaluation unit reduces the speed of the motor when a limit value is exceeded by the filtered measurement signal.
  • the control method records a measurement signal as a measure of accelerations within the handheld power tool.
  • the accelerations In particular, spin accelerations or a change in a rotational speed about the working axis of the handheld power tool may be.
  • the signal strength of the measurement signal is determined in a frequency band by a frequency equal to the product of the rotational speed of the drive-side wheel with the number of blocking bodies.
  • the filter selects accelerations and vibrations associated with the lock body clutch due to their periodic occurrence.
  • the power consumption of the power tool is reduced when the signal strength in the frequency band exceeds a threshold.
  • the user receives in the usual way a feedback through the spinning blocking body coupling that an applied torque exceeds a set limit.
  • the subsequent automatic reduction of engine power increases the life of the locking body coupling.
  • the hand tool can measure the speed of the drive-side wheel and adjust the frequency band to the measured speed.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
  • a battery pack 8 or a power line supplies the motor 5 with power.
  • a user can guide the hammer drill 1 by means of a handle 9 and be by means of a system switch 10 to the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill 4 continuously about a working axis 11 and can beat the drill 4 in the direction of impact 12 along the working axis 11 in a substrate.
  • the percussion 6 is a pneumatic percussion 6.
  • An exciter piston 13 and a racket 14 are movably guided in a guide tube 15 in the striking mechanism 6 along the working axis 11 .
  • the excitation piston 13 is coupled via an eccentric 16 to the motor 5 and forced to a periodic, linear movement.
  • a connecting rod 17 connects the eccentric 16 with the excitation piston 13.
  • An air spring formed by a pneumatic chamber 18 between the excitation piston 13 and the racket 14 couples a movement of the racket 14 to the movement of the exciter piston 13 .
  • the racket 14 can strike directly on a rear end of the drill 4 or indirectly transmit a portion of its pulse to the drill 4 via a substantially resting intermediate racket 19 .
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 20 .
  • the output shaft 7 is coupled via a mechanical locking body coupling 21 to the motor 5 .
  • the exemplary lock body coupling 21 has a bevel gear 22 which rotates about the work axis 11 .
  • a driven by the motor 5 bevel gear 23 meshes with the bevel gear 22 of the locking body coupling 21.
  • the bevel gear 22 is coupled via locking bodies 24 with a hub 25 .
  • the rotary sprocket 25 is rotatably mounted about the same axis as the bevel gear 23 , here about the working axis 11.
  • the rotary disk 25 is movable along the working axis 11 .
  • the turntable 25 is in a first position so close to the bevel gear 23 that the locking body 24 engage both the bevel gear 22 and the turntable 25 .
  • the torque from the bevel gear 22 is transmitted to the rotary disk 25 .
  • the turntable 25 can move away from the bevel gear 22 as far along the working axis 11 into a second position that the blocking bodies 24 no longer engage in the turntable 25 .
  • the locking body coupling 21 is open.
  • a spring 26 counteracts the deflection of the hub 25 from the first position.
  • the blocking bodies 24 are exemplary balls that can be caught in pockets in the bevel gear 22 and engage in pockets in the turntable 25 .
  • the locking body coupling 21 is closed when engaging the balls in the pockets and transmits a torque.
  • the illustrated blocking body coupling is exemplary.
  • the hub may be disposed within the bevel gear, the locking bodies are spring-loaded movable in the radial direction.
  • the hammer drill 1 reduces the torque when the locking body coupling 21 responds, for example because the drill 4 blocks in the ground.
  • the hammer drill 1 has a sensor 27 which detects vibrations occurring in the machine housing.
  • the sensor 27 may be a gyrosensor which detects rotational movements about an axis parallel to the working axis 11 .
  • the blocking body clutch 21 generates the transition from the open position to the closed position, a jerk in the drive train by the coupling of the drill 4 to the motor 5.
  • the jerk as a single event little specific and, for example, depending on the size of the drill 4 and the material of the substrate.
  • the locking body coupling 21 opens and closes periodically.
  • the duration between two closing operations is determined by the speed of the driving bevel gear 22 and the angle by which the bevel gear 23 must be rotated until the locking body 24 can engage again.
  • the angle is inversely proportional to the number of blocking bodies 24.
  • the measuring signal 28 of the sensor 27 is fed to a bandwidth filter 29 .
  • the bandwidth filter 29 is tuned in its characteristic to the Sperranalysiskupplung 21 .
  • the center frequency of the bandwidth filter 29 is preferably equal to the product of the rotational speed of the driven bevel gear 22 and the number of locking bodies 24.
  • the number of locking bodies 24 is deposited as a fixed size in the evaluation unit 30 .
  • the speed of the bevel gear 22 is due to the fixed gear reduction in a known manner proportional to the engine speed, which is detected by sensor or queried in a speed-controlled motor 5 of the corresponding speed control 31 .
  • the triggering frequency of the blocking body clutch 21 may be lower than the calculated frequency, because the drive spindle continues to rotate due to its angular momentum. As a rule, however, the angular momentum decreases rapidly, in particular with a load on the drill 4 .
  • the frequency band is in a range of 75% to 150% of the calculated center frequency.
  • the evaluation unit 30 outputs an interference signal 32 when the filtered measurement signal 33 exceeds a limit value.
  • the interference signal 32 is forwarded to the motor controller 31 , which then reduces the speed of the motor 5 .
  • the speed is preferably reduced until the filtered measurement signal 33 is below the limit value.
  • the engine controller 31 reduces the speed only when the limit has been exceeded for a predetermined duration, eg, at least 2 seconds. The user realizes the triggering of the blocking body clutch 21 and in this way receives clear feedback as to why the engine power has been reduced or set to zero.
  • the bandwidth filter 29 preferably has an adjustable center frequency.
  • the bandwidth filter 29 detects the rotational speed of the bevel gear 22 and advances the center frequency.
  • the bandwidth filter 29 is preferably implemented as a digital filter, eg as a software routine in a signal processor.
  • the signal processor can determine signal strength in parallel in several frequency bands.
  • the evaluation unit 30 is the signal strength of the frequency band supplied, the center frequency of the product of the number of locking body 24 and speed comes closest.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP14174696.6A 2014-06-27 2014-06-27 Machine-outil portative et procédé de commande Withdrawn EP2960021A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP14174696.6A EP2960021A1 (fr) 2014-06-27 2014-06-27 Machine-outil portative et procédé de commande
EP15731912.0A EP3160689B1 (fr) 2014-06-27 2015-06-25 Machine-outil portative et procédé de commande
US15/321,982 US10751866B2 (en) 2014-06-27 2015-06-25 Handheld power tool and control method
CN201580031188.9A CN106457541A (zh) 2014-06-27 2015-06-25 手持式工具机和控制方法
PCT/EP2015/064353 WO2015197753A1 (fr) 2014-06-27 2015-06-25 Machine-outil à main et procédé de commande
US16/517,317 US11123854B2 (en) 2014-06-27 2019-07-19 Handheld power tool and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14174696.6A EP2960021A1 (fr) 2014-06-27 2014-06-27 Machine-outil portative et procédé de commande

Publications (1)

Publication Number Publication Date
EP2960021A1 true EP2960021A1 (fr) 2015-12-30

Family

ID=51136314

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14174696.6A Withdrawn EP2960021A1 (fr) 2014-06-27 2014-06-27 Machine-outil portative et procédé de commande
EP15731912.0A Active EP3160689B1 (fr) 2014-06-27 2015-06-25 Machine-outil portative et procédé de commande

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP15731912.0A Active EP3160689B1 (fr) 2014-06-27 2015-06-25 Machine-outil portative et procédé de commande

Country Status (4)

Country Link
US (2) US10751866B2 (fr)
EP (2) EP2960021A1 (fr)
CN (1) CN106457541A (fr)
WO (1) WO2015197753A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3610990A1 (fr) * 2018-08-14 2020-02-19 Hilti Aktiengesellschaft Procédé de commande pour une machine-outil portative, machine-outil portative et système doté d'une machine-outil portative et d'un support

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016220001A1 (de) 2015-10-15 2017-04-20 Robert Bosch Gmbh Handwerkzeugmaschine
DE102017107485A1 (de) 2017-04-07 2018-10-11 C. & E. Fein Gmbh Oszillierend antreibbares Handwerkzeug und Verfahren zum Betreiben eines solchen
CN109549681B (zh) * 2018-11-22 2021-12-17 南昌大学第二附属医院 钻孔装置
EP3756823A1 (fr) * 2019-06-27 2020-12-30 Hilti Aktiengesellschaft Procédé de détection d'un état d'une machine-outil ainsi que machine-outil
US11845173B2 (en) 2020-10-16 2023-12-19 Milwaukee Electric Tool Corporation Anti bind-up control for power tools

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1666754A2 (fr) * 2004-12-06 2006-06-07 C. & E. Fein GmbH Outil électrique avec un embrayage
US20090008115A1 (en) 2007-07-04 2009-01-08 Kevin Guo Hand-held power tool with a slip clutch
EP2410650A2 (fr) * 2010-07-20 2012-01-25 C. & E. Fein GmbH Outil manuel
EP2514570A2 (fr) * 2011-04-20 2012-10-24 HILTI Aktiengesellschaft Machine-outil manuelle et réducteur de vibrations
EP2517839A2 (fr) * 2011-04-27 2012-10-31 HILTI Aktiengesellschaft Machine-outil et procédé de commande
US20130240230A1 (en) * 2012-03-16 2013-09-19 Robert Bosch Gmbh Hand-held power tool

Family Cites Families (13)

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Publication number Priority date Publication date Assignee Title
DE4344817C2 (de) 1993-12-28 1995-11-16 Hilti Ag Verfahren und Einrichtung für handgeführte Werkzeugmaschinen zur Vermeidung von Unfällen durch Werkzeugblockieren
DE10021356A1 (de) 2000-05-02 2001-11-08 Hilti Ag Drehendes Elektrohandwerkzeuggerät mit Sicherheitsroutine
DE102004025951A1 (de) 2004-05-27 2005-12-22 Robert Bosch Gmbh Handwerkzeugmaschine, insbesondere Bohr- und/oder Schlaghammer
EP1607186A1 (fr) * 2004-06-18 2005-12-21 HILTI Aktiengesellschaft Perceuse à percussion / marteau piqueur électro-pneumatique à énergie d'impact modifiable
DE102007062727A1 (de) * 2007-12-27 2009-07-02 Robert Bosch Gmbh Vorrichtung und Verfahren zum Ergreifen einer Sicherungsmaßnahme bei einem Elektrowerkzeug
DE102009045758A1 (de) * 2009-10-16 2011-04-21 Robert Bosch Gmbh Handwerkzeug mit einer Werkstofferfassungsvorrichtung
DE102012208855A1 (de) 2012-05-25 2013-11-28 Robert Bosch Gmbh Handwerkzeugmaschine
JP5852509B2 (ja) 2012-05-29 2016-02-03 株式会社マキタ 電動工具
DE102013200602B4 (de) * 2013-01-16 2023-07-13 Robert Bosch Gmbh Elektrowerkzeug mit verbesserter Bedienbarkeit
WO2014162862A1 (fr) * 2013-03-30 2014-10-09 日立工機株式会社 Outil à moteur
DE102013224759A1 (de) * 2013-12-03 2015-06-03 Robert Bosch Gmbh Werkzeugmaschinenvorrichtung
EP3023200A1 (fr) * 2014-11-20 2016-05-25 HILTI Aktiengesellschaft Procédé de commande d'une perceuse
EP3023202A1 (fr) * 2014-11-20 2016-05-25 HILTI Aktiengesellschaft Procédé de sécurité et machine-outil manuelle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1666754A2 (fr) * 2004-12-06 2006-06-07 C. & E. Fein GmbH Outil électrique avec un embrayage
US20090008115A1 (en) 2007-07-04 2009-01-08 Kevin Guo Hand-held power tool with a slip clutch
EP2410650A2 (fr) * 2010-07-20 2012-01-25 C. & E. Fein GmbH Outil manuel
EP2514570A2 (fr) * 2011-04-20 2012-10-24 HILTI Aktiengesellschaft Machine-outil manuelle et réducteur de vibrations
EP2517839A2 (fr) * 2011-04-27 2012-10-31 HILTI Aktiengesellschaft Machine-outil et procédé de commande
US20130240230A1 (en) * 2012-03-16 2013-09-19 Robert Bosch Gmbh Hand-held power tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3610990A1 (fr) * 2018-08-14 2020-02-19 Hilti Aktiengesellschaft Procédé de commande pour une machine-outil portative, machine-outil portative et système doté d'une machine-outil portative et d'un support

Also Published As

Publication number Publication date
US10751866B2 (en) 2020-08-25
EP3160689B1 (fr) 2018-12-12
US20190337137A1 (en) 2019-11-07
EP3160689A1 (fr) 2017-05-03
US20170129089A1 (en) 2017-05-11
CN106457541A (zh) 2017-02-22
WO2015197753A1 (fr) 2015-12-30
US11123854B2 (en) 2021-09-21

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