EP3898116A1 - Handwerkzeugmaschine - Google Patents
HandwerkzeugmaschineInfo
- Publication number
- EP3898116A1 EP3898116A1 EP19828542.1A EP19828542A EP3898116A1 EP 3898116 A1 EP3898116 A1 EP 3898116A1 EP 19828542 A EP19828542 A EP 19828542A EP 3898116 A1 EP3898116 A1 EP 3898116A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric motor
- tool
- hand
- racket
- 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
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 present invention relates to a chiseling hand tool, e.g. a hammer drill or an electric chisel.
- a chiseling hand tool e.g. a hammer drill or an electric chisel.
- WO 2008/071489 A1 describes a chiseling hand machine tool.
- the hand tool has a pneumatic hammer mechanism, which is driven by an electric motor.
- a reduction gear adjusts the speed of the electric motor to the number of blows of the striking mechanism.
- the reduction gear has a first stage and a second stage. The second stage is designed as part of an eccentric gearwheel in order to be able to integrate it into the hand-held power tool in view of the space restrictions.
- GB 1 210 006 describes a chiseling hand machine tool, the transmission of which is exposed to high loads. The load results from the retroactive forces of the striking mechanism and also when a drill is blocked. The teeth of the gear stages can break. The gearbox is designed accordingly robust.
- a chiseling hand machine tool has a tool holder for holding a tool on a working axis, an electric motor and a striking mechanism.
- the percussion mechanism has an exciter piston coupled to the motor, a racket guided on the working axis and a pneumatic chamber which is closed off from the exciter piston and the racket for coupling movement of the racket to the exciter piston.
- the speed of the electric motor corresponds to at least 20 times the number of blows of the striking mechanism.
- the speed of the electric motor is greater than 80,000 revolutions per minute.
- the ratio of the mass of the electric motor (8) to the nominal power of the electric motor is less than 0.2 g / W.
- Fig. 1 a hammer drill
- the hammer drill has a tool holder 2, in which a tool 3 can be inserted and locked.
- the tools 3 can be, for example, drills for the chiseling processing of mineral building materials, such as concrete or stone, or chisels for the purely chiseling processing of the same building materials.
- the hammer drill 1 contains a pneumatic hammer mechanism 4, which periodically strikes the tool 3 in the direction of impact 5 during operation.
- the handheld power tool 1 can have an output shaft 6, which rotates the tool holder 2 and thus the tool 3 about a working axis 7 during operation.
- the striking mechanism 4 and the output shaft 6 are driven by an electric motor 8.
- the output shaft 6 can be switched off in chiseling hand machine tools 1; purely chiseling hand machine tools 1 are without an output shaft.
- 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 direction of impact 5 and running centrally through the tool holder 2 preferably runs through the handle 9 if 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 this can be operated by the hand gripping the handle 9.
- the striking mechanism 4 has an exciter piston 12, a striker 13 and a striker 14.
- the exciter piston 12, the striker 13 and the striker 14 are arranged in succession in the striking direction 5 lying on the working axis 7.
- 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 that 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, e.g. a wobble drive.
- the striker 13 is coupled to the movement of the exciter piston 12 by a pneumatic chamber 18, also referred to as an air spring.
- the pneumatic chamber 18 is closed along the working axis 7 on the drive side by the exciter piston 12 and on the tool side by the striker 13.
- the racket 13 is designed as a piston.
- the pneumatic chamber 18 is closed in the radial direction by a guide tube 19.
- the exciter piston 12 and the striker 13 slide airtightly against the inner surface of the guide tube 19.
- the exciter piston can be cup-shaped.
- the racket slides within the exciter piston.
- the racket can be cup-shaped, the exciter piston sliding within the racket.
- the tool-side reversal point is predetermined by the striker 14, on which the striker 13 strikes in the tool-side reversal point.
- the striker 14 transmits the blow to the tool 3 arranged in the tool holder 2.
- a number of blows is largely fixed for the handheld power tool 1 with the pneumatic striking mechanism 4.
- the number of strokes corresponds to the round trip time of the exciter piston 12.
- the round trip time is adapted to the flight time of the racket 13 in order to ensure efficient energy transmission.
- the striking mechanism 4 shows a behavior that is typically known from resonantly excited systems.
- Optimal energy transfer is given at the nominal number of strokes of handheld power tool 1. Deviations of more than 10% typically lead to an intolerable reduction in efficiency. Typical beat numbers range from 10 beats per second to 100 beats per second. Chisel hammers with a high impact energy above 20 J (joules) typically have a low impact rate, in the range between 10 and 40 impacts per second. Chisel hammers and combination hammers with medium and low impact energies in the range between 0.5 J and 20 J have typical impact rates in the range between 40 and 100 impacts per second.
- the pneumatic hammer mechanism 4 has desired a strongly discontinuous behavior in the power output.
- the bat 13 releases the kinetic energy obtained during one revolution in a very short time in the form of a blow. This leads to discontinuous power consumption of the pneumatic striking mechanism 4 by the electric motor 8.
- the striker 13 is accelerated in the striking direction 5 in less than one eighth of the revolution by the exciter piston 12. Otherwise, the club 13 moves almost without force. This leads to considerable load changes for the driving electric motor 8.
- Common hand power tools therefore use electric motors with a large moment of inertia of the rotor 20. The moment of inertia acts as a buffer during the acceleration phase of the striker 13.
- the embodiment of handheld power tool 1 takes a different approach.
- the electric motor 8 is designed to be able to react directly to the dynamic load change of the striking mechanism 4.
- the electric motor 8 has a high speed in comparison to the number of blows of the pneumatic hammer mechanism 4.
- the speed is at least 20 times, preferably at least 30 times, the number of strokes.
- the rotor of the electric motor 8 rotates at least 20 times per stroke and thus per revolution of the racket 13.
- the electric motor 8 rotates at least two to three times during the short acceleration phase of the racket 13.
- the energy output per revolution of the rotor 20 is less than 1 joule.
- the gear train 15 has a reduction ratio of at least 20 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. In addition, there are losses due to friction. Typical losses are between 90% and 95% at a low speed of 2 ⁇ 00 rpm. The losses increase with increasing speed. And the multiple stages require volume, which runs counter to the tendency to build the handheld power tools 1 compactly.
- a planetary gear stage 150 can be directly coupled to the electric motor as the first stage.
- the electric motor 8 has a high nominal speed.
- the nominal speed is greater than 80,000 revolutions per minute.
- the striking mechanism 4 strikes with the nominal number of strokes, i.e. the striking mechanism 4 works with optimal 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, such as in a so-called BLCD motor.
- 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 250 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP18214666.2A EP3670095A1 (de) | 2018-12-20 | 2018-12-20 | Handwerkzeugmaschine |
| PCT/EP2019/025465 WO2020126089A1 (de) | 2018-12-20 | 2019-12-20 | Handwerkzeugmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3898116A1 true EP3898116A1 (de) | 2021-10-27 |
| EP3898116B1 EP3898116B1 (de) | 2023-11-22 |
Family
ID=64755181
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18214666.2A Withdrawn EP3670095A1 (de) | 2018-12-20 | 2018-12-20 | Handwerkzeugmaschine |
| EP19828542.1A Active EP3898116B1 (de) | 2018-12-20 | 2019-12-20 | Meisselnde handwerkzeugmaschine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18214666.2A Withdrawn EP3670095A1 (de) | 2018-12-20 | 2018-12-20 | Handwerkzeugmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US11364611B2 (de) |
| EP (2) | EP3670095A1 (de) |
| CN (1) | CN113165151B (de) |
| WO (1) | WO2020126089A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11529727B2 (en) | 2019-10-21 | 2022-12-20 | Makita Corporation | Power tool having hammer mechanism |
| JP7624296B2 (ja) * | 2020-03-31 | 2025-01-30 | 株式会社マキタ | 打撃工具 |
| EP4037158B1 (de) | 2021-02-02 | 2025-07-30 | Black & Decker, Inc. | Bürstenloser motor mit verschachtelter lagerbrücke |
| CN116833958A (zh) * | 2022-03-25 | 2023-10-03 | 南京泉峰科技有限公司 | 电动工具及电锤 |
| US20250262736A1 (en) * | 2024-01-10 | 2025-08-21 | Milwaukee Electric Tool Corporation | Reciprocating impact tool with impact control |
Family Cites Families (20)
| 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 |
| CH532454A (fr) * | 1971-03-16 | 1973-01-15 | Etem Ets De Tech Mod | Outil pneumatique à percussion et rotation |
| US4095654A (en) * | 1976-11-15 | 1978-06-20 | Ross Frederick W | Impact device with multiple connecting rods and gearing |
| DE4020776A1 (de) * | 1990-06-29 | 1992-01-09 | Pi Patente Gmbh | Vorrichtung zum antrieb eines werkzeuges fuer eine axiale hin- und herbewegung des werkzeuges |
| DE10259566A1 (de) | 2002-12-19 | 2004-07-01 | Hilti Ag | Schlagende Elektrohandwerkzeugmaschine |
| 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 |
| DE102006059076A1 (de) * | 2006-12-14 | 2008-06-19 | Robert Bosch Gmbh | Schlagwerk einer Elektrohandwerkzeugmaschine |
| DE102009008190A1 (de) * | 2009-01-30 | 2010-08-05 | Hilti Aktiengesellschaft | Pneumatisches Schlagwerk |
| JP5376216B2 (ja) * | 2009-01-30 | 2013-12-25 | 日立工機株式会社 | 往復動工具 |
| 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 (en) * | 2009-06-26 | 2010-12-29 | Sandvik Mining And Construction Oy | Method for controlling rock drilling |
| 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 (de) * | 2014-11-20 | 2016-05-25 | HILTI Aktiengesellschaft | Steuerungsverfahren für einen Bohrhammer |
| EP3034242A1 (de) * | 2014-12-18 | 2016-06-22 | HILTI Aktiengesellschaft | Handwerkzeugmaschine |
| JP2017202560A (ja) * | 2016-05-13 | 2017-11-16 | 株式会社マキタ | 打撃工具 |
-
2018
- 2018-12-20 EP EP18214666.2A patent/EP3670095A1/de not_active Withdrawn
-
2019
- 2019-12-20 WO PCT/EP2019/025465 patent/WO2020126089A1/de not_active Ceased
- 2019-12-20 CN CN201980079537.2A patent/CN113165151B/zh active Active
- 2019-12-20 US US17/291,216 patent/US11364611B2/en active Active
- 2019-12-20 EP EP19828542.1A patent/EP3898116B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113165151B (zh) | 2024-04-23 |
| WO2020126089A1 (de) | 2020-06-25 |
| US11364611B2 (en) | 2022-06-21 |
| EP3898116B1 (de) | 2023-11-22 |
| US20210402583A1 (en) | 2021-12-30 |
| CN113165151A (zh) | 2021-07-23 |
| EP3670095A1 (de) | 2020-06-24 |
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