EP3670095A1 - Machine-outil portative - Google Patents

Machine-outil portative Download PDF

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Publication number
EP3670095A1
EP3670095A1 EP18214666.2A EP18214666A EP3670095A1 EP 3670095 A1 EP3670095 A1 EP 3670095A1 EP 18214666 A EP18214666 A EP 18214666A EP 3670095 A1 EP3670095 A1 EP 3670095A1
Authority
EP
European Patent Office
Prior art keywords
electric motor
tool
striker
striking mechanism
exciter piston
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Withdrawn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
EP18214666.2A
Other languages
German (de)
English (en)
Inventor
Christian Schallert
Jürgen Pritz
Marcel Wondra
Carl Hoffmann
Walter Vallaster
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 EP18214666.2A priority Critical patent/EP3670095A1/fr
Priority to EP19828542.1A priority patent/EP3898116B1/fr
Priority to CN201980079537.2A priority patent/CN113165151B/zh
Priority to PCT/EP2019/025465 priority patent/WO2020126089A1/fr
Priority to US17/291,216 priority patent/US11364611B2/en
Publication of EP3670095A1 publication Critical patent/EP3670095A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/062—Means for driving the impulse member comprising a wobbling mechanism, swash plate
    • 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
    • B25D2250/091—Electrically-powered tool components
    • B25D2250/095—Electric motors
    • 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
    • B25D2250/391—Use of weights; Weight properties of the tool

Definitions

  • the hand tool 1 has a handle 9 , by means of which the user can hold and guide the hand tool 1 in operation.
  • the handle 9 is attached to a machine housing 10 .
  • the handle 9 is preferably arranged at an end of the handheld power tool 1 or of the machine housing 10 remote from the tool holder 2 .
  • a working axis 7 parallel to the striking direction 5 and running centrally through the tool holder 2 preferably runs through the handle 9 when it can be gripped with one hand.
  • the handle 9 can be partially decoupled from the machine housing 10 by damping elements in order to dampen vibrations of the striking mechanism 4 .
  • the user can put the handheld power tool 1 into operation by means of a button 11 . Pressing the button 11 activates the motor 8.
  • the button 11 is preferably arranged on the handle 9 , as a result of which it can be operated by the hand gripping the handle 9 .
  • the striking mechanism 4 has an exciter piston 12 , a racket 13 and a striker 14.
  • the exciter piston 12 , the striker 13 and the striker 14 are arranged successively on the working axis 7 in the striking direction 5 .
  • the excitation piston 12 is coupled to the motor 8 via a gear train 15 .
  • the gear train converts the rotary movement of the motor 8 into a periodic forward and backward movement of the excitation piston 12 on the working axis 7 .
  • An exemplary gear train contains an eccentric wheel 16 and a connecting rod 17.
  • the gear train 15 can contain, among other things, a step-down gear which adjusts the speed of the electric motor 8 to the speed of the eccentric wheel 16 .
  • the speed of the eccentric wheel 16 corresponds to the nominal number of strokes of the striking mechanism 4.
  • other mechanisms can convert the rotational movement of the electric motor 8 into the translational movement of the exciter piston 12 , for example a wobble drive.
  • the gear train 15 has a reduction ratio of at least 15 to 1, preferably at least 20 to 1, preferably at least 30 to 1.
  • An upper limit for the reduction ratio is assumed to be 80 to 1.
  • the high gear ratio requires several stages connected in series. First, each gear stage increases the moment of inertia, which reduces the dynamics. There are also losses due to friction. And the multiple stages require volume, which runs counter to the tendency to build the handheld power tools 1 compactly.
  • the electric motor 8 has a high nominal speed.
  • the nominal speed is greater than 60,000 revolutions per minute, preferably greater than 80,000 revolutions per minute.
  • the striking mechanism 4 strikes with the nominal number of strikes, ie the striking mechanism 4 operates with the optimum efficiency.
  • the speed of the electric motor 8 is preferably less than 200,000 revolutions per minute. Electric motors with higher speeds should require a filigree structure of the rotor 20 , which does not withstand the load changes and accompanying torque changes permanently.
  • the electric motor 8 has a power output of at least 250 W (watts) at the nominal speed. For larger combination hammers or chisel hammers, an electric motor 8 with a power output of at least 500 W up to 3,000 W is necessary.
  • the electric motor 8 is preferably a brushless electric motor 8.
  • the brushless electric motor 8 has a stator 21 and a rotor 20.
  • the stator 21 generates a rotating magnetic field which specifies the speed of the rotor 20 .
  • the rotor 20 can contain permanent magnets that interact with the rotating magnetic field.
  • the brushless electric motor 8 can be designed as a reluctance motor, the rotor 20 of which is made of a soft magnetic material.
  • the electric motor 8 preferably has a rotor 20 with a low moment of inertia so that the electric motor 8 can react dynamically to the load changes.
  • a moment of inertia of the rotor 20 is preferably less than 10 g cm2 (grams times square centimeter).
  • the electric motor 8 enables high acceleration, a mass of the electric motor 8 to its nominal power is preferably less than 0.2 g / W (grams per watt). A lower limit is 0.03 g / W.
  • the rotor 20 preferably has an elongated structure. A length of the rotor 20 is significantly larger than the diameter of the rotor 20 , preferably at least 3 times as long.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP18214666.2A 2018-12-20 2018-12-20 Machine-outil portative Withdrawn EP3670095A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP18214666.2A EP3670095A1 (fr) 2018-12-20 2018-12-20 Machine-outil portative
EP19828542.1A EP3898116B1 (fr) 2018-12-20 2019-12-20 Machine-outil portative de burinage
CN201980079537.2A CN113165151B (zh) 2018-12-20 2019-12-20 便携式动力工具
PCT/EP2019/025465 WO2020126089A1 (fr) 2018-12-20 2019-12-20 Machine-outil portative
US17/291,216 US11364611B2 (en) 2018-12-20 2019-12-20 Hand-held power tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18214666.2A EP3670095A1 (fr) 2018-12-20 2018-12-20 Machine-outil portative

Publications (1)

Publication Number Publication Date
EP3670095A1 true EP3670095A1 (fr) 2020-06-24

Family

ID=64755181

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18214666.2A Withdrawn EP3670095A1 (fr) 2018-12-20 2018-12-20 Machine-outil portative
EP19828542.1A Active EP3898116B1 (fr) 2018-12-20 2019-12-20 Machine-outil portative de burinage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19828542.1A Active EP3898116B1 (fr) 2018-12-20 2019-12-20 Machine-outil portative de burinage

Country Status (4)

Country Link
US (1) US11364611B2 (fr)
EP (2) EP3670095A1 (fr)
CN (1) CN113165151B (fr)
WO (1) WO2020126089A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11837935B2 (en) 2021-02-02 2023-12-05 Black & Decker, Inc. Canned brushless motor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11318596B2 (en) 2019-10-21 2022-05-03 Makita Corporation Power tool having hammer mechanism
JP2021160046A (ja) * 2020-03-31 2021-10-11 株式会社マキタ 打撃工具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB819055A (en) * 1956-07-13 1959-08-26 Peugeot & Cie Improvements in percussion tools
GB1210006A (en) * 1967-07-24 1970-10-28 Hilti Ag Motor-powered hammer drill
US3587754A (en) * 1969-11-24 1971-06-28 L F Garot Power driven hammers
US4095654A (en) * 1976-11-15 1978-06-20 Ross Frederick W Impact device with multiple connecting rods and gearing
EP1431005A2 (fr) * 2002-12-19 2004-06-23 HILTI Aktiengesellschaft Outil à main électrique à percussion
WO2008071489A1 (fr) * 2006-12-14 2008-06-19 Robert Bosch Gmbh Dispositif de percussion d'une machine-outil électrique à main

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH532454A (fr) * 1971-03-16 1973-01-15 Etem Ets De Tech Mod Outil pneumatique à percussion et rotation
DE4020776A1 (de) * 1990-06-29 1992-01-09 Pi Patente Gmbh Vorrichtung zum antrieb eines werkzeuges fuer eine axiale hin- und herbewegung des werkzeuges
US7273159B2 (en) * 2004-11-08 2007-09-25 Black & Decker Inc. Cordless power tool system with improved power output
US7497275B2 (en) * 2005-11-04 2009-03-03 Black & Decker Inc. Cordless power tool system with improved power output
JP5376216B2 (ja) * 2009-01-30 2013-12-25 日立工機株式会社 往復動工具
DE102009008190A1 (de) * 2009-01-30 2010-08-05 Hilti Aktiengesellschaft Pneumatisches Schlagwerk
JP5234287B2 (ja) * 2009-04-07 2013-07-10 マックス株式会社 電動工具およびそのモータ制御方法
WO2010149827A1 (fr) * 2009-06-26 2010-12-29 Sandvik Mining And Construction Oy Procédé de commande de forage de roche
DE102010062094A1 (de) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Hammerschlagwerk
DE102012208870A1 (de) * 2012-05-25 2013-11-28 Robert Bosch Gmbh Schlagwerkeinheit
JP6380924B2 (ja) * 2014-01-06 2018-08-29 パナソニックＩｐマネジメント株式会社 インパクト回転工具の慣性モーメントの測定方法とその測定方法を用いたインパクト回転工具
EP3023200A1 (fr) * 2014-11-20 2016-05-25 HILTI Aktiengesellschaft Procédé de commande d'une perceuse
EP3034242A1 (fr) * 2014-12-18 2016-06-22 HILTI Aktiengesellschaft Machine-outil manuelle
JP2017202560A (ja) * 2016-05-13 2017-11-16 株式会社マキタ 打撃工具

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB819055A (en) * 1956-07-13 1959-08-26 Peugeot & Cie Improvements in percussion tools
GB1210006A (en) * 1967-07-24 1970-10-28 Hilti Ag Motor-powered hammer drill
US3587754A (en) * 1969-11-24 1971-06-28 L F Garot Power driven hammers
US4095654A (en) * 1976-11-15 1978-06-20 Ross Frederick W Impact device with multiple connecting rods and gearing
EP1431005A2 (fr) * 2002-12-19 2004-06-23 HILTI Aktiengesellschaft Outil à main électrique à percussion
WO2008071489A1 (fr) * 2006-12-14 2008-06-19 Robert Bosch Gmbh Dispositif de percussion d'une machine-outil électrique à main

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11837935B2 (en) 2021-02-02 2023-12-05 Black & Decker, Inc. Canned brushless motor
US11855521B2 (en) 2021-02-02 2023-12-26 Black & Decker, Inc. Brushless DC motor for a body-grip power tool
US11870316B2 (en) 2021-02-02 2024-01-09 Black & Decker, Inc. Brushless motor including a nested bearing bridge
US11876424B2 (en) 2021-02-02 2024-01-16 Black & Decker Inc. Compact brushless motor including in-line terminals
US11955863B2 (en) 2021-02-02 2024-04-09 Black & Decker Inc. Circuit board assembly for compact brushless motor

Also Published As

Publication number Publication date
US11364611B2 (en) 2022-06-21
US20210402583A1 (en) 2021-12-30
EP3898116A1 (fr) 2021-10-27
EP3898116B1 (fr) 2023-11-22
WO2020126089A1 (fr) 2020-06-25
CN113165151A (zh) 2021-07-23
CN113165151B (zh) 2024-04-23

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