EP3347166A1 - Machine-outil portative et procédé de commande - Google Patents
Machine-outil portative et procédé de commandeInfo
- Publication number
- EP3347166A1 EP3347166A1 EP16760720.9A EP16760720A EP3347166A1 EP 3347166 A1 EP3347166 A1 EP 3347166A1 EP 16760720 A EP16760720 A EP 16760720A EP 3347166 A1 EP3347166 A1 EP 3347166A1
- Authority
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000001960 triggered effect Effects 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 3
- 238000009527 percussion Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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 with an electric motor and a control method for the power tool.
- 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 of the invention 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 inventive control method for the power tool 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
- 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.
- 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.
- 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)
Abstract
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 true EP3347166A1 (fr) | 2018-07-18 |
EP3347166B1 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)
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 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
CN110170967B (zh) * | 2018-02-20 | 2023-03-21 | 美克司株式会社 | 打入工具 |
-
2015
- 2015-09-10 EP EP15184693.8A patent/EP3141349A1/fr not_active Withdrawn
-
2016
- 2016-09-06 US US15/759,099 patent/US10946509B2/en active Active
- 2016-09-06 EP EP16760720.9A patent/EP3347166B1/fr active Active
- 2016-09-06 WO PCT/EP2016/070919 patent/WO2017042144A1/fr active Application Filing
- 2016-09-06 CN CN201680052535.0A patent/CN108025427B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
WO2017042144A1 (fr) | 2017-03-16 |
EP3347166B1 (fr) | 2019-08-21 |
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 |
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