EP3160689A1 - Hand-held power tool and control method - Google Patents
Hand-held power tool and control methodInfo
- Publication number
- EP3160689A1 EP3160689A1 EP15731912.0A EP15731912A EP3160689A1 EP 3160689 A1 EP3160689 A1 EP 3160689A1 EP 15731912 A EP15731912 A EP 15731912A EP 3160689 A1 EP3160689 A1 EP 3160689A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- side wheel
- drive
- tool
- control method
- rotational speed
- 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 description 8
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000000903 blocking effect Effects 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000011156 evaluation Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 238000009527 percussion Methods 0.000 description 3
- 230000036461 convulsion Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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 machine having a lock body coupling for interrupting a rotary drive of a tool.
- US 2009/0081 15 describes a rotary hammer with a mechanical locking body coupling.
- the locking body coupling triggers when a torque applied to the drill exceeds a triggering torque.
- the SperrAvemkupplung is exposed to high mechanical loads, as the user continues to try to continue his work.
- 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 a hammer drill
- Fig. 1 shows an example of a chiseling hand tool machine schematically a hammer drill 1.
- 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 lead the hammer drill 1 by means of a handle 9 and take the hammer drill 1 by means of a system switch 10 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 body 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 release frequency of the locking body coupling 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 rotational speed only when the limit value has been exceeded for a predetermined duration, e.g. at least 2 seconds, has been exceeded. 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14174696.6A EP2960021A1 (en) | 2014-06-27 | 2014-06-27 | Handheld machine tool and control method |
PCT/EP2015/064353 WO2015197753A1 (en) | 2014-06-27 | 2015-06-25 | Hand-held power tool and control method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3160689A1 true EP3160689A1 (en) | 2017-05-03 |
EP3160689B1 EP3160689B1 (en) | 2018-12-12 |
Family
ID=51136314
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14174696.6A Withdrawn EP2960021A1 (en) | 2014-06-27 | 2014-06-27 | Handheld machine tool and control method |
EP15731912.0A Active EP3160689B1 (en) | 2014-06-27 | 2015-06-25 | Handheld machine tool and control method |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14174696.6A Withdrawn EP2960021A1 (en) | 2014-06-27 | 2014-06-27 | Handheld machine tool and control method |
Country Status (4)
Country | Link |
---|---|
US (2) | US10751866B2 (en) |
EP (2) | EP2960021A1 (en) |
CN (1) | CN106457541A (en) |
WO (1) | WO2015197753A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016220001A1 (en) | 2015-10-15 | 2017-04-20 | Robert Bosch Gmbh | Hand tool |
DE102017107485A1 (en) | 2017-04-07 | 2018-10-11 | C. & E. Fein Gmbh | Oscillably drivable hand tool and method for operating such |
EP3610990B1 (en) * | 2018-08-14 | 2021-05-05 | Hilti Aktiengesellschaft | Control method for a hand-held machine tool, handheld machine tool and system including the handheld machine tool and a stand |
CN109549681B (en) * | 2018-11-22 | 2021-12-17 | 南昌大学第二附属医院 | Drilling device |
EP3756823A1 (en) * | 2019-06-27 | 2020-12-30 | Hilti Aktiengesellschaft | Machine tool and method for detecting the condition of a machine tool |
US11845173B2 (en) | 2020-10-16 | 2023-12-19 | Milwaukee Electric Tool Corporation | Anti bind-up control for power tools |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4344817C2 (en) | 1993-12-28 | 1995-11-16 | Hilti Ag | Method and device for hand-held machine tools to avoid accidents due to tool blocking |
DE10021356A1 (en) * | 2000-05-02 | 2001-11-08 | Hilti Ag | Rotating electric hand tool device with safety routine has revolution rate dependent coupling in force transfer path from electric motor to gearbox for transferring torque |
DE102004025951A1 (en) * | 2004-05-27 | 2005-12-22 | Robert Bosch Gmbh | Hand tool, in particular drill and / or percussion hammer |
EP1607186A1 (en) * | 2004-06-18 | 2005-12-21 | HILTI Aktiengesellschaft | Electro-pneumatic hammer drill / chisel hammer with modifiable impact energy |
DE102004059814A1 (en) | 2004-12-06 | 2006-06-08 | C. & E. Fein Gmbh | Coupling, in particular for a power tool |
DE102007000365A1 (en) | 2007-07-04 | 2009-01-08 | Hilti Aktiengesellschaft | Hand tool with friction clutch |
DE102007062727A1 (en) * | 2007-12-27 | 2009-07-02 | Robert Bosch Gmbh | Device and method for taking a safety measure in a power tool |
DE102009045758A1 (en) | 2009-10-16 | 2011-04-21 | Robert Bosch Gmbh | Hand tool e.g. drilling machine, has processing unit connected with acceleration sensor and electric motor and drive shaft and controlling rotational movement of motor and drive shaft based on acceleration signal |
DE102010032335A1 (en) * | 2010-07-20 | 2012-01-26 | C. & E. Fein Gmbh | hand tool |
DE102011007725A1 (en) * | 2011-04-20 | 2012-10-25 | Hilti Aktiengesellschaft | Hand tool and absorber |
DE102011017579A1 (en) * | 2011-04-27 | 2012-10-31 | Hilti Aktiengesellschaft | Machine tool and control method |
DE102012204172A1 (en) * | 2012-03-16 | 2013-09-19 | Robert Bosch Gmbh | Hand tool |
DE102012208855A1 (en) | 2012-05-25 | 2013-11-28 | Robert Bosch Gmbh | Hand tool |
JP5852509B2 (en) | 2012-05-29 | 2016-02-03 | 株式会社マキタ | Electric tool |
DE102013200602B4 (en) * | 2013-01-16 | 2023-07-13 | Robert Bosch Gmbh | Power tool with improved usability |
US10183384B2 (en) * | 2013-03-30 | 2019-01-22 | Koki Holdings Co., Ltd. | Power tool |
DE102013224759A1 (en) * | 2013-12-03 | 2015-06-03 | Robert Bosch Gmbh | Machine tool device |
EP3023200A1 (en) * | 2014-11-20 | 2016-05-25 | HILTI Aktiengesellschaft | Control method for a hammer drill |
EP3023202A1 (en) * | 2014-11-20 | 2016-05-25 | HILTI Aktiengesellschaft | Security method and handheld machine tool |
-
2014
- 2014-06-27 EP EP14174696.6A patent/EP2960021A1/en not_active Withdrawn
-
2015
- 2015-06-25 US US15/321,982 patent/US10751866B2/en active Active
- 2015-06-25 CN CN201580031188.9A patent/CN106457541A/en active Pending
- 2015-06-25 WO PCT/EP2015/064353 patent/WO2015197753A1/en active Application Filing
- 2015-06-25 EP EP15731912.0A patent/EP3160689B1/en active Active
-
2019
- 2019-07-19 US US16/517,317 patent/US11123854B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN106457541A (en) | 2017-02-22 |
US20170129089A1 (en) | 2017-05-11 |
EP3160689B1 (en) | 2018-12-12 |
WO2015197753A1 (en) | 2015-12-30 |
US11123854B2 (en) | 2021-09-21 |
EP2960021A1 (en) | 2015-12-30 |
US20190337137A1 (en) | 2019-11-07 |
US10751866B2 (en) | 2020-08-25 |
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