EP3347166B1 - Machine-outil portative et procede de commande - Google Patents

Machine-outil portative et procede de commande Download PDF

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Publication number
EP3347166B1
EP3347166B1 EP16760720.9A EP16760720A EP3347166B1 EP 3347166 B1 EP3347166 B1 EP 3347166B1 EP 16760720 A EP16760720 A EP 16760720A EP 3347166 B1 EP3347166 B1 EP 3347166B1
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EP
European Patent Office
Prior art keywords
electric motor
temperature
threshold
clutch
tool
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.)
Active
Application number
EP16760720.9A
Other languages
German (de)
English (en)
Other versions
EP3347166A1 (fr
Inventor
Eric Mascall
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
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Hilti AG
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Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP3347166A1 publication Critical patent/EP3347166A1/fr
Application granted granted Critical
Publication of EP3347166B1 publication Critical patent/EP3347166B1/fr
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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
    • B25F5/008—Cooling means
    • 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

Definitions

  • the present invention relates to a hand tool according to the preamble of claim 1 with an electric motor and a control method for the power tool.
  • a hand tool and such a control method are from the EP 2 662 187 A known.
  • a hand tool can be used with high load for a long time.
  • the electric motor and the drive train heats so much that damage or high wear of the power tool is to be expected.
  • a protective measure is to switch off the power tool.
  • the hand tool according to the invention according to claim 1 has a tool holder for holding a tool on a working axis, an electric motor for driving the tool holder, a temperature sensor for detecting a temperature of the electric motor and a fan coupled to the electric motor.
  • An electrically controlled clutch is disposed in the drive train between the tool holder and the electric motor.
  • a motor controller is responsive to exceeding a first threshold by the measured temperature triggering an opening of the clutch.
  • the engine control is energizing the electric motor with the clutch open until the temperature falls below a second threshold.
  • the hand tool according to the invention does not switch off the electric motor after a thermal overload, but allows it to continue running. Parts or all driven components of the hand tool, e.g. the tool holder, a striking mechanism, are decoupled.
  • the electric motor can drive the fan and cool the power tool quickly.
  • the control method according to the invention for the power tool according to claim 3 provides the following steps: measuring the temperature of the electric motor; Opening the shiftable clutch when the temperature exceeds a first threshold; and energizing the electric motor with the clutch open until the temperature drops below the second threshold drops.
  • the electric motor is switched without current, ie switched off when the temperature falls below the second threshold.
  • the second threshold is preferably less than the first threshold.
  • Fig. 1 shows a hammer drill 1 as an example of electric hand tool machines.
  • Other hand tool machines may be electric screwdrivers, circular saws, jigsaws, angle grinders, etc.
  • the hammer drill 1 has a tool holder 2, in which a drill or similar tool 3 can be used and locked.
  • the tool holder 2 is coupled via a drive train 4 with an electric motor 5 .
  • the drive train 4 includes an output shaft 6, which transmits the torque of the electric motor 5 to the tool holder 2 .
  • a transmission 7 can increase the torque.
  • the drive train 4 may further include a striking mechanism 8, in particular a pneumatic percussion mechanism 8 , which periodically exerts impacts on the tool held in the tool holder 2 .
  • the exemplary pneumatic percussion 8 has an exciter piston 9, which is moved back and forth by the electric motor 5 along a working axis 10 in a guide tube 11 .
  • a likewise arranged in the guide tube 11 piston-shaped racket 12 is coupled by an air spring to the exciter piston 9 .
  • the air spring is formed by a closed by the excitation piston 9 and racket 12 pneumatic chamber 13 .
  • a shiftable clutch 14 is arranged in the drive train 4 .
  • the clutch 14 can be opened and closed by an electrical control signal.
  • An exemplary clutch 14 has a solenoid 15 which, when energized, maintains a driving clutch plate 16 and a driven clutch plate 17 in contact.
  • the Control signal switches the current flow on or off.
  • the switchable coupling can also be mechanically, pneumatically or hydraulically switchable.
  • a corresponding actuator can convert the electrical control signal into the mechanical, pneumatic or hydraulic action for switching the clutch 14 .
  • the shiftable clutch 14 is arranged in the drive train 4 between the output shaft 6 and the electric motor 5 .
  • the opened clutch 14 separates the tool holder 2 from the electric motor 5, so that, in spite of the running electric motor 5, the tool holder 2 does not rotate.
  • the switchable clutch 14 may be arranged in the drive train 4 in front of the percussion mechanism 8 in order to deactivate them when the clutch 14 is open.
  • the electric motor 5 is driven by a motor controller 18 .
  • the operation of the operation button 19 by the user detects the motor controller 18.
  • the motor controller 18 is energized in response to the operation of the electric motor 5.
  • the power supply is provided, for example, by a battery pack 20 or by a power connector.
  • the operating button 19 is preferably switched off automatically. The user must operate the operating button 19 permanently to keep the hammer drill 1 in operation. Upon release of the operating button 19 , the operating button 19 changes to the off position.
  • the motor control 18 separates the electric motor 5 from the power supply in response to the switch-off position of the operating button 19 .
  • the operation button 19 has an internal spring that biases the operation button 19 in the off position.
  • the operation button 19 may be a simple on-off switch. Preferably, the operation button 19 detects a operation path or an operation force.
  • the operating button 19 provides a variable setpoint for the average current of the electric motor 5 .
  • the motor controller 18 controls the average current in response to the setpoint. The user can thus influence the speed of the electric motor 5 by pressing in different directions.
  • the operating button 19 has, for example, a potentiometer formed by slider tracks as a switching contact.
  • the hammer drill 1 includes a fan 21, which cools the electric motor 5 and preferably the drive train 4 .
  • the fan 21 may be arranged on the rotor shaft of the electric motor 5 .
  • the fan 21 for example, downstream of the electric motor 5 arranged suck a stream of air 22 from the electric motor 5 and blow out of the machine housing 23 .
  • a temperature sensor 24 monitors the temperature of the electric motor 5.
  • the temperature sensor 24 may be arranged directly on the electric motor 5 or arranged, for example, in an exhaust air flow of the hammer drill 1 .
  • the engine controller 18 monitors the measured temperature. If the temperature exceeds a threshold value, the power consumption of the electric motor 5 is limited. The motor controller 18 , for example, reduces the average current compared to the predetermined by the operating button 19 setpoint. If the temperature exceeds a critical threshold value, the engine controller 18 opens the clutch 14. The electric motor 5 is thus switched free of load. The motor controller 18 continues to energize the electric motor 5, so that this rotates and the fan 21 drives. The average current for this cooling mode is adapted to the missing load.
  • the fan 21 preferably rotates at a constant speed, which allows a maximum cooling rate.
  • the cooling mode continues until the temperature is sufficiently lowered.
  • the temperature to be reached is preferably less than the critical threshold, for example lower by 2 ° C (degrees Celsius) to 10 ° C.
  • the engine controller 18 initially ignores the operating button 19, although this changes to the off position. As long as the temperature is greater than the temperature to be reached, the electric motor 5 remains energized and drives the fan 21 at. The motor controller 18 turns off the electric motor 5 when the temperature falls below the temperature to be reached.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Power Tools In General (AREA)
  • Drilling And Boring (AREA)

Claims (6)

  1. Machine-outil manuelle comportant :
    un porte-outil pour maintenir un outil sur un axe de travail (10),
    un moteur électrique (5) pour entraîner le porte-outil,
    un capteur de température (24) pour détecter une température du moteur électrique (5) et
    une roue de ventilateur (21) couplée au moteur électrique (5),
    caractérisée en ce que la machine-outil manuelle est équipée d'un embrayage commandé électriquement (14) dans la transmission (4) entre le porte-outil (2) et le moteur électrique (5), et d'une commande de moteur (18) qui déclenche une ouverture de l'embrayage (14) en réponse à un dépassement d'une première valeur seuil par la température mesurée, et qui met sous tension le moteur électrique (5) lorsque l'embrayage (14) est ouvert jusqu'à ce que la température chute sous une seconde valeur seuil.
  2. Machine-outil manuelle selon la revendication 1, caractérisée en ce qu'un bouton-poussoir d'alimentation (19) pour mettre sous tension le moteur électrique (5) est automatiquement mis hors tension et la commande de moteur (18) met sous tension le moteur électrique (5) lorsque la température dépasse la première valeur seuil malgré la position de mise hors tension du bouton-poussoir d'alimentation (19).
  3. Procédé de commande pour une machine-outil manuelle (1) comportant un porte-outil (2) pour maintenir un outil, un moteur électrique (5) entraînant le porte-outil (2), un embrayage commutable (14) agencé dans la transmission (4) entre le porte-outil (2) et le moteur électrique (5), une roue de ventilateur (21) entraînée par le moteur électrique (5) et un capteur de température (24) pour détecter une température du moteur électrique (5), comportant les étapes consistant à :
    mesurer la température du moteur électrique (5),
    ouvrir l'embrayage commutable (14) lorsque la température dépasse une première valeurseuil, et
    mettre sous tension le moteur électrique (5) lorsque l'embrayage (14) est ouvert jusqu'à ce que la température chute sous la seconde valeur seuil.
  4. Procédé de commande selon la revendication 3, caractérisé en ce que lorsque la température passe au-dessous de la seconde valeur seuil, le moteur électrique (5) est mis hors tension.
  5. Procédé de commande selon la revendication 3 ou 4, caractérisé par les étapes consistant à :
    détecter un déclenchement du bouton-poussoir d'alimentation (19) par l'utilisateur,
    en réponse au déclenchement, mettre hors tension le moteur électrique (5) lorsque la température est inférieure à la première valeur seuil, sinon exécuter les étapes selon la revendication 3.
  6. Procédé de commande selon les revendications 3 à 5, caractérisé en ce que la seconde valeur seuil est entre 2 °C et 10 °C inférieure à la première valeur seuil.
EP16760720.9A 2015-09-10 2016-09-06 Machine-outil portative et procede de commande Active EP3347166B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15184693.8A EP3141349A1 (fr) 2015-09-10 2015-09-10 Machine-outil portative et procede de commande
PCT/EP2016/070919 WO2017042144A1 (fr) 2015-09-10 2016-09-06 Machine-outil portative et procédé de commande

Publications (2)

Publication Number Publication Date
EP3347166A1 EP3347166A1 (fr) 2018-07-18
EP3347166B1 true EP3347166B1 (fr) 2019-08-21

Family

ID=54106230

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15184693.8A Withdrawn EP3141349A1 (fr) 2015-09-10 2015-09-10 Machine-outil portative et procede de commande
EP16760720.9A Active EP3347166B1 (fr) 2015-09-10 2016-09-06 Machine-outil portative et procede de commande

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15184693.8A Withdrawn EP3141349A1 (fr) 2015-09-10 2015-09-10 Machine-outil portative et procede de commande

Country Status (4)

Country Link
US (1) US10946509B2 (fr)
EP (2) EP3141349A1 (fr)
CN (1) CN108025427B (fr)
WO (1) WO2017042144A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7259338B2 (ja) * 2018-02-20 2023-04-18 マックス株式会社 打ち込み工具
CN110170967B (zh) * 2018-02-20 2023-03-21 美克司株式会社 打入工具
EP3653342B1 (fr) * 2018-10-26 2024-01-17 Max Co., Ltd. Outil électrique
TWI691387B (zh) * 2018-11-06 2020-04-21 朝程工業股份有限公司 電動工具
CN109746877A (zh) * 2019-03-27 2019-05-14 常州格力博有限公司 手持式电动工具

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US2280914A (en) * 1939-03-04 1942-04-28 Westinghouse Electric & Mfg Co Temperature protection for industrial motors
JPH1142570A (ja) 1997-07-28 1999-02-16 Matsushita Electric Works Ltd 電動工具
JP2007082366A (ja) 2005-09-16 2007-03-29 Hitachi Koki Co Ltd 電動機、およびそれを備えた電動工具
JP2009056556A (ja) * 2007-08-31 2009-03-19 Panasonic Electric Works Co Ltd 電動工具用ホルダ及びこれを用いた電動工具システム
DE102007000524A1 (de) * 2007-10-18 2009-04-23 Hilti Aktiengesellschaft Elektrohandwerkzeugmaschine mit Motortemperaturkontrolle
US8627900B2 (en) * 2008-05-29 2014-01-14 Hitachi Koki Co., Ltd. Electric power tool
DE102008042776B3 (de) * 2008-10-13 2010-03-04 Aeg Electric Tools Gmbh Adaptive Kühleinrichtung für ein Elektrowerkzeug
JP5472683B2 (ja) 2009-05-11 2014-04-16 日立工機株式会社 電動工具
AU2010278059A1 (en) * 2009-07-29 2011-10-13 Hitachi Koki Co., Ltd. Impact tool
JP5464434B2 (ja) * 2010-03-31 2014-04-09 日立工機株式会社 電動工具
DE102010030092A1 (de) 2010-06-15 2011-12-15 Hilti Aktiengesellschaft Eintreibvorrichtung
DE102010030059A1 (de) * 2010-06-15 2011-12-15 Hilti Aktiengesellschaft Handgeführtes Eintreibgerät
US9028088B2 (en) * 2010-09-30 2015-05-12 Black & Decker Inc. Lighted power tool
EP2647472B1 (fr) * 2010-12-02 2016-09-14 Makita Corporation Outil électrique
JP5938652B2 (ja) * 2012-05-10 2016-06-22 パナソニックＩｐマネジメント株式会社 電動工具
DE102013202946A1 (de) * 2013-02-22 2014-09-11 Robert Bosch Gmbh Handwerkzeugmaschine
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Also Published As

Publication number Publication date
WO2017042144A1 (fr) 2017-03-16
EP3141349A1 (fr) 2017-03-15
US10946509B2 (en) 2021-03-16
CN108025427B (zh) 2021-09-10
US20180311806A1 (en) 2018-11-01
CN108025427A (zh) 2018-05-11
EP3347166A1 (fr) 2018-07-18

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