EP1172180B1 - Percussion electrohandtool apparatus - Google Patents
Percussion electrohandtool apparatus Download PDFInfo
- Publication number
- EP1172180B1 EP1172180B1 EP01810652A EP01810652A EP1172180B1 EP 1172180 B1 EP1172180 B1 EP 1172180B1 EP 01810652 A EP01810652 A EP 01810652A EP 01810652 A EP01810652 A EP 01810652A EP 1172180 B1 EP1172180 B1 EP 1172180B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- handtool
- electro
- percussion
- accordance
- handle
- 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.)
- Expired - Lifetime
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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
-
- 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
- B25D2250/005—Adjustable tool components; Adjustable parameters
- B25D2250/021—Stroke length
-
- 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 invention refers to an at least partially striking electric hand tool device, like a hammer drill or a chisel hammer, with a pneumatic hammer mechanism According to the preamble of claim 1.
- a baffle is known from EP 0063 725 A.
- beating electric hand tool devices is the electric motor of the electric hand tool generated rotational movement at least partially via suitable transformation means in a swinging or impact-translatory movement transferred.
- suitable transformation means in a swinging or impact-translatory movement transferred.
- Usual is the use of wobble to one to the drive shaft parallel oscillation axis and eccentric oscillators with a vertical swing axis.
- the swinging motion in a pneumatic percussion over a Exciter piston on a gas spring on a flying piston and finally axially on the Transfer tool.
- For rotary hammers is additionally from the drive shaft over suitable gear derived the rotational movement of the tool spindle, causing the Oscillation frequency or the stroke rate of the tool always in a fixed, optional stepped switchable, ratio to the speed of the tool spindle is.
- a free-stroke automatic is in striking hand tools previously known, which in the absence of axial working pressure on the tool over suitable means, for example.
- a continuous regulation of the impact energy by the user is not possible.
- the speed of the tool spindle is changed in a stepped manner used a planetary gear. A steady adjustment of the stroke number Speed of the tool spindle is not possible.
- the oscillation amplitude is due to the adjustment of the axial position the eccentric continuously adjustable, by means of an oblique eccentric eccentricity is constantly changeable.
- a planetary gear is used to drive the eccentric pin, in which the dimensions of the single planetary gear and the internally toothed Sun gear in which it runs, are set so that every point on the Rolling circle of the planetary gear follows a straight-line trajectory.
- the Sun gear 90 ° is the piston stroke of a full stroke, which the pitch circle diameter corresponds to the sun, can be changed to almost zero.
- the sun wheel will for continuous adjustment of the vibration amplitude by a self-locking worm gear or a lockable, radially extending adjustment handle in the respective Angular position fixed.
- the speed of the drive power means an arranged in the power supply electronic phase control through the inside of the handle lying, finger-operated pressure switch button depression depth dependent To steer steadily, for example, to a soft start of the power tool or to regulate the speed with the interposition of the user.
- a planetary gear is used as a crank gear, in which the Dimensions of the single planetary gear and the internally toothed sun gear, in which it runs, are set so that every point on the pitch circle of the planetary gear a straight-line trajectory follows and the eccentric pin of the planet gear over a connecting rod with a parallel to the tool axis a reciprocating motion exporting, impact-producing means, for example.
- An exciter piston is connected and the angle of the non-rotatably adjustable sun gear depending on the length of the tool axis force applied to the handle is adjustable.
- the rotatably adjustable sun gear is the angle of the linear reciprocating motion the eccentric pin constantly changeable. Regarding a certain speed thus the impact energy is continuously adjustable via the amplitude of the oscillation.
- a space-stop is of this solution at a setting ⁇ of the sun gear of almost 0 included.
- the setting ⁇ of the sun gear via a mechanical with the handle, pneumatically or electronically coupled adjustment mechanism which is necessary self-locking, so that the opposing forces of vibration generation on the entire housing and not predominantly act on the handle. It becomes one, the impact performance controlling, displacement range of the handle in the range up to 3 cm Depicted on actuating means on an angle change ⁇ of the sun gear to ⁇ / 2.
- a worm drive in self-locking, helical engagement in an associated external toothing of the sun gear is advantageous even via servo control means by the in Electric hand tool device power available.
- energy for the setting ⁇ of the sun gear are the kinetic drive energy available via controllable adjusting clutches, the pneumatic compression energy available via controllable valves and the available via controllable servomotors electrical energy
- controllable servomotors can advantageously by the user or by a microcontroller the impact performance according to the desired operating conditions be set or regulated.
- a measurement of actually in the tool introduced actual impact performance can indirectly via displacement, pressure or acceleration sensors and corresponding measuring electronics.
- the control of the desired impact power over the impact amplitude is carried out, advantageously independently from a drive power control via the push button, on the force applied to the handle of the power tool axial force, because this directly corresponds to the intuitive will of the user.
- This is advantageous against a Axialallekraft limits axially movable executed handle in the direction of tool or Pressed workpiece and thus causes the setting ⁇ of the sun gear, causing the Impact energy increases.
- the handle via a radially offset to the tool axis and perpendicular to this lying rotary joint connected to the remaining hand tool.
- These Axial force is indirectly via a shift or directly via a piezoelectric force sensor measured and fed via the measuring electronics to the microcontroller as a setpoint.
- the Microcontroller calculates the setting ⁇ of the sun gear via one from the microcontroller readable operating data map in the form of a suitable non-linear mapping of Axial force or four-shift in the realization of the necessary impact performance required setting ⁇ of the sun gear and takes this setting ⁇ over the Actuator before.
- microcontroller additionally wide suitable characteristics such as speed, torque, current consumption and device acceleration as well optional tool type and size determined and for optimal and safe operation considered in accordance with the readable by the microcontroller operating data map.
- the working direction can be determined by tilt sensors and at known weight over the microcontroller the true, desired by the user, Setpoint of the percussion power can be calculated.
- This is the inclination sensor with the Microcontroller connected, which the real measured axial force on the handle to the Holding force corrected, which multiplies the weight of the hand tool with the direction cosine of the working direction of the electric hand tool device for Acceleration corresponds to.
- Fig. 1 is for the transformation of a rotational movement ⁇ of a drive shaft 1 in a thereto vertical oscillatory motion ⁇ parallel to one in a plane of the drive shaft. 1 lying tool axis A a impact-generating means 2, for example.
- the planetary gear 5 is designed such that the continuously rotatable adjustable Sun gear 6 is designed as an internally toothed ring gear with the diameter 2r, in which an externally toothed planetary gear 7 with the diameter r expires.
- the continuously rotatable adjustable Sun gear 6 is designed as an internally toothed ring gear with the diameter 2r, in which an externally toothed planetary gear 7 with the diameter r expires.
- the direction of this rectilinear back and forth Hermos be changed constantly.
- Fig. 3 is a self-locking on the circumference of the sun gear 6 of the planetary gear 5 Worm drive 9 arranged.
- the axial force F via a on the housing 10 of the electric power tool 8 attached piezoelectric force sensor 12 measured and the measuring electronics a microcontroller 13 supplied as a setpoint, which via a suitable non-linear mapping of Axial force F in the necessary to realize the necessary impact performance setting ⁇ of the planetary gear 5 calculates this and the setting ⁇ of the planetary gear fifth against the housing 10 via a self-locking worm drive 9 connected Actuator 14 performs.
- An inclination sensor 15 associated with the microcontroller 13 determines the working direction to correct the setpoint to F with known dead weight A of the electric hand tool device 8.
- An operating data sensor 16 determines the speed and the torque of the drive shaft 1 to read about a microcontroller 13 readable Operating data map each optimal or one of the axial force F associated impact amplitude to be able to determine. In this case, further advantageous operating parameters determined and taken into account in the calculation.
- the microprocessor 13 takes into consideration the operating data from the manually predetermined, advantageously tilt sensors 15 and corrected by the microprocessor 13, setpoint for the impact performance this Impact power or alternatively the optimal impact performance over a in the operating data map, readable at least at interpolation points, deposited image in one to achieve this Impact power over the impact amplitude required setting ⁇ converted.
- the microprocessor 13 the changes of this setting ⁇ am Planetary gear 5 made via a servomotor 14.
- the step is taken by the microcontroller 13 from the further characteristic values detected by sensors calculated an actual impact performance, this compared with the target value and the Setting ⁇ counteracted on the planetary gear 5 according to the comparison value.
Description
Die Erfindung bezeichnet ein zumindest teilweise schlagendes Elektrohandwerkzeuggerät,
wie einen Bohrhammer oder einen Meisselhammer, mit einem pneumatischen Schlagwerk
gemäß dem Oberbegriff des Anspruchs 1. Ein solches Schlegwerk ist aus EP 0063 725 A bekennt.The invention refers to an at least partially striking electric hand tool device,
like a hammer drill or a chisel hammer, with a pneumatic hammer mechanism
According to the preamble of
Bei schlagenden Elektrohandwerkzeuggeräten wird die vom Elektromotor des Elektrohandwerkzeuggerätes erzeugte Drehbewegung zumindest teilweise über geeignete Transformationsmittel in eine schwingende bzw. schlagschwingende translatorische Bewegung überführt. Üblich ist die Verwendung von Taumelschwingern zu einer zur Antriebswelle parallelen Schwingachse sowie von Exzenterschwingern mit einer senkrechten Schwingachse. Zumeist wird die Schwingbewegung in einem pneumatischen Schlagwerk über einen Erregerkolben auf eine Gasfeder auf einen Flugkolben und schliesslich axial auf das Werkzeug übertragen. Bei Bohrhämmern wird zusätzlich von der Antriebswelle über geeignete Getriebe die Drehbewegung der Werkzeugspindel abgeleitet, wodurch die Schwingfrequenz bzw. die Schlagzahl des Werkzeuges stets in einem festen, optional gestuft schaltbaren, Verhältnis zur Drehzahl der Werkzeugspindel steht.In beating electric hand tool devices is the electric motor of the electric hand tool generated rotational movement at least partially via suitable transformation means in a swinging or impact-translatory movement transferred. Usual is the use of wobble to one to the drive shaft parallel oscillation axis and eccentric oscillators with a vertical swing axis. In most cases, the swinging motion in a pneumatic percussion over a Exciter piston on a gas spring on a flying piston and finally axially on the Transfer tool. For rotary hammers is additionally from the drive shaft over suitable gear derived the rotational movement of the tool spindle, causing the Oscillation frequency or the stroke rate of the tool always in a fixed, optional stepped switchable, ratio to the speed of the tool spindle is.
Bei schlagenden Handwerkzeuggeräten ist bspw. aus der EP759341 eine Freischlagautomatik vorbekannt, welche bei fehlendem axialen Arbeitsdruck auf das Werkzeug über geeignete Mittel, bspw. eine über eine axial verschiebbare Schalthülse vermittelte Öffnung von Ventilen des pneumatischen Schlagwerks, im wesentlichen eine diskrete, optional gestufte, Unterbrechung des Schlages bewirkt. Eine stetige Regelung der Schlagenergie durch den Nutzer ist damit nicht möglich.For example, from EP759341 a free-stroke automatic is in striking hand tools previously known, which in the absence of axial working pressure on the tool over suitable means, for example. A mediated via an axially displaceable shift sleeve opening of valves of pneumatic percussion, essentially a discrete, optional stepped, interruption of the blow causes. A continuous regulation of the impact energy by the user is not possible.
Nach der JP414653/90 wird zur gestuften Umschaltung der Drehzahl der Werkzeugspindel ein Planetengetriebe verwendet. Eine stetige Verstellung der Schlagzahl gegenüber Drehzahl der Werkzeugspindel ist nicht möglich.According to JP414653 / 90, the speed of the tool spindle is changed in a stepped manner used a planetary gear. A steady adjustment of the stroke number Speed of the tool spindle is not possible.
Nach der DE3505544 ist die Schwingamplitude durch die Verstellung der axialen Position des Exzenters stetig einstellbar, indem über einen schrägen Exzenterzapfen die Exzentrizität stetig veränderbar ist. According to DE3505544, the oscillation amplitude is due to the adjustment of the axial position the eccentric continuously adjustable, by means of an oblique eccentric eccentricity is constantly changeable.
Nach der EP063725 wird zum Antrieb des Exzenterzapfens ein Planetengetriebe verwendet, bei welchem die Abmessungen des einzigen Planetenrades und des innenverzahnten Sonnenrades, in welchem es abläuft, derart festgelegt sind, dass jeder Punkt auf dem Wälzkreis des Planetenrades einer geradlinigen Bahnkurve folgt. Durch Verdrehung des Sonnenrades um 90° ist der Kolbenhub von einem vollen Hub, welcher dem Wälzkreisdurchmesser des Sonnenrades entspricht, bis auf fast Null veränderbar. Das Sonnenrad wird zur stetigen Einstellung der Schwingamplitude durch ein selbsthemmendes Schneckengetriebe oder einen feststellbaren, sich radial erstreckenden Verstellgriff in der jeweiligen Winkellage fixiert.According to EP063725, a planetary gear is used to drive the eccentric pin, in which the dimensions of the single planetary gear and the internally toothed Sun gear in which it runs, are set so that every point on the Rolling circle of the planetary gear follows a straight-line trajectory. By twisting the Sun gear 90 ° is the piston stroke of a full stroke, which the pitch circle diameter corresponds to the sun, can be changed to almost zero. The sun wheel will for continuous adjustment of the vibration amplitude by a self-locking worm gear or a lockable, radially extending adjustment handle in the respective Angular position fixed.
Bei Elektrohandwerkzeuggeräten ist es üblich, die Drehzahl über die Antriebsleistung mittels einer in der Stromversorgung angeordneten elektronischen Phasenanschnittssteuerung durch den im Inneren des Handgriffs liegenden, fingerbetätigten Druckschaltknopf eindrücktiefenabhängig stetig zu steuern, bspw. um ein sanftes Anlaufen des Handwerkzeuggerätes zu ermöglichen bzw. um unter Zwischenschaltung des Nutzers die Drehzahl zu regeln.In electric hand tool devices, it is customary, the speed of the drive power means an arranged in the power supply electronic phase control through the inside of the handle lying, finger-operated pressure switch button depression depth dependent To steer steadily, for example, to a soft start of the power tool or to regulate the speed with the interposition of the user.
Aus der DE19503526 ist vorbekannt, den Handgriff des Handwerkzeuggerätes senkrecht zur Werkzeugachse und versetzt zu dieser drehbar zu lagern und den dadurch entstehenden begrenzten Bewegungsfreiheitsgrad längs der Werkzeugachse zur Vibrationsdämpfung des Handgriffs zu nutzen.From DE19503526 is already known, the handle of the power tool perpendicular to Tool axis and offset to this rotatably store and the resulting limited degree of freedom of movement along the tool axis for vibration damping of Handle to use.
Es ist eine Aufgabe der Erfindung, eine von der Drehzahl des Antriebs unabhängige stetige Steuerung bzw. unter Zwischenschaltung des Nutzers eine Regelung der Schlagleistung von schlagenden Handwerkzeuggeräten zu ermöglichen.It is an object of the invention to provide a continuous independent of the speed of the drive Control or with the interposition of the user a control of the impact of to allow striking hand tools.
Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is essentially achieved by the features of the independent claims. Advantageous developments emerge from the subclaims.
Im wesentlichen wird als Kurbelgetriebe ein Planetengetriebe verwendet, bei welchem die Abmessungen des einzigen Planetenrades und des innenverzahnten Sonnenrades, in welchem es abläuft, derart festgelegt sind, dass jeder Punkt auf dem Wälzkreis des Planetenrades einer geradlinigen Bahnkurve folgt und der Exzenterzapfen des Planetenrades über eine Pleuelstange mit einem parallel zur Werkzeugachse eine Hin- und Herbewegung ausführenden, schlagerzeugenden Mittel, bspw. einem Erregerkolben, verbunden ist sowie der Winkel des drehfest einstellbaren Sonnenrades abhängig von der längs der Werkzeugachse auf den Handgriff aufgebrachten Kraft einstellbar ist. Essentially, a planetary gear is used as a crank gear, in which the Dimensions of the single planetary gear and the internally toothed sun gear, in which it runs, are set so that every point on the pitch circle of the planetary gear a straight-line trajectory follows and the eccentric pin of the planet gear over a connecting rod with a parallel to the tool axis a reciprocating motion exporting, impact-producing means, for example. An exciter piston, is connected and the angle of the non-rotatably adjustable sun gear depending on the length of the tool axis force applied to the handle is adjustable.
Über das drehfest einstellbare Sonnenrad ist der Winkel der geradlinigen Hin- und Herbewegung des Exzenterzapfens stetig veränderbar. Bezüglich einer bestimmten Drehzahl ist somit über die Amplitude der Schwingung die Schlagenergie stetig einstellbar. Eine Leerschlagabschaltung ist von dieser Lösung bei einer Einstellung α des Sonnenrades von nahezu 0 mitumfasst.About the rotatably adjustable sun gear is the angle of the linear reciprocating motion the eccentric pin constantly changeable. Regarding a certain speed thus the impact energy is continuously adjustable via the amplitude of the oscillation. A space-stop is of this solution at a setting α of the sun gear of almost 0 included.
Die Einstellung α des Sonnenrades erfolgt über einen mit dem Handgriff mechanisch, pneumatisch oder elektronisch gekoppelten Einstellmechanismus, welcher notwendig selbsthemmend ausgeführt ist, damit die Gegenkräfte der Schwingungserzeugung auf das gesamte Gehäuse und nicht überwiegend auf den Handgriff zurückwirken. Dabei wird ein, die Schlagleistung steuernder, Verschiebungsbereich des Handgriffs im Bereich bis zu 3 cm über Stellmittel auf eine Winkeländerung Δα des Sonnenrades bis π/2 abgebildet.The setting α of the sun gear via a mechanical with the handle, pneumatically or electronically coupled adjustment mechanism which is necessary self-locking, so that the opposing forces of vibration generation on the entire housing and not predominantly act on the handle. It becomes one, the impact performance controlling, displacement range of the handle in the range up to 3 cm Depicted on actuating means on an angle change Δα of the sun gear to π / 2.
Vorteilhaft steht ein Schneckentrieb im selbsthemmenden, schneckenförmigen Eingriff in eine zugeordnete Aussenverzahnung des Sonnenrades. Ein den Schneckentrieb antreibendes Zahnradgetriebe wird vorteilhaft selbst über Servosteuerungsmittel durch die im Elektrohandwerkzeuggerät verfügbare Energie angetrieben. Als Energie für die Einstellung α des Sonnenrades stehen die über steuerbare Stellkupplungen verfügbare kinetische Antriebsenergie, die über steuerbare Ventile verfügbare pneumatische Kompressionsenergie sowie die über steuerbare Stellmotoren verfügbare elektrische Energie zur VerfügungAdvantageously, a worm drive in self-locking, helical engagement in an associated external toothing of the sun gear. A driving the worm drive Gear transmission is advantageous even via servo control means by the in Electric hand tool device power available. As energy for the setting α of the sun gear are the kinetic drive energy available via controllable adjusting clutches, the pneumatic compression energy available via controllable valves and the available via controllable servomotors electrical energy
Bei der Verwendung von steuerbaren Stellmotoren kann vorteilhaft vom Nutzer oder von einem Mikrocontroller die Schlagleistung entsprechend der gewünschten Betriebsbedingungen eingestellt oder geregelt werden. Eine Messung der tatsächlich in das Werkzeug eingebrachten Ist-Schlagleistung kann mittelbar über Weg-, Druck- oder Beschleunigungssensoren und entsprechender Messelektronik erfolgen.When using controllable servomotors can advantageously by the user or by a microcontroller the impact performance according to the desired operating conditions be set or regulated. A measurement of actually in the tool introduced actual impact performance can indirectly via displacement, pressure or acceleration sensors and corresponding measuring electronics.
Die Steuerung der Soll-Schlagleistung über die Schlagamplitude erfolgt, vorteilhaft unabhängig von einer über den Druckschaltknopf vorgenommenen Steuerung der Antriebsleistung, über die auf den Handgriff der Handwerkzeuggerätes aufgebrachte Axialkraft, weil diese dem intuitiven Willen des Nutzers unmittelbar entspricht. Dazu wird der vorteilhaft gegen eine Axialgegenkraft begrenzt axial beweglich ausgeführte Handgriff in Richtung Werkzeug bzw. Werkstück gedrückt und damit die Einstellung α des Sonnenrades bewirkt, wodurch die Schlagenergie zunimmt.The control of the desired impact power over the impact amplitude is carried out, advantageously independently from a drive power control via the push button, on the force applied to the handle of the power tool axial force, because this directly corresponds to the intuitive will of the user. This is advantageous against a Axialgegenkraft limits axially movable executed handle in the direction of tool or Pressed workpiece and thus causes the setting α of the sun gear, causing the Impact energy increases.
Vorteilhaft ist der Handgriff über ein radial versetzt zur Werkzeugachse und senkrecht zu dieser liegendes Drehgelenk mit dem restlichen Handwerkzeuggerät verbunden. Diese Axialkraft wird mittelbar über eine Verschiebung oder unmittelbar über einen Piezokraftsensor gemessen und über die Messelektronik dem Mikrocontroller als Sollwert zugeführt. Der Mikrocontroller berechnet die Einstellung α des Sonnenrades über ein vom Mikrocontroller lesbares Betriebsdatenkennfeld in Form einer geeigneten nichtlinearen Abbildung der Axialkraft oder der Vierschiebung in die zur Realisierung der notwendigen Schlagleistung erforderliche Einstellung α des Sonnenrades und nimmt diese Einstellung α über den Stellmotor vor.Advantageously, the handle via a radially offset to the tool axis and perpendicular to this lying rotary joint connected to the remaining hand tool. These Axial force is indirectly via a shift or directly via a piezoelectric force sensor measured and fed via the measuring electronics to the microcontroller as a setpoint. Of the Microcontroller calculates the setting α of the sun gear via one from the microcontroller readable operating data map in the form of a suitable non-linear mapping of Axial force or four-shift in the realization of the necessary impact performance required setting α of the sun gear and takes this setting α over the Actuator before.
Vorteilhaft werden zur Berechnung vom Mikrocontroller zusätzlich weite geeignete Kennwerte wie Drehzahl, Drehmoment, Stromaufnahme und Gerätebeschleunigung sowie optional Werkzeugart- und -grösse bestimmt und für einen optimalen und sicheren Betrieb entsprechend des vom Mikrocontroller lesbaren Betriebsdatenkennfeldes berücksichtigt.Advantageously, the calculation of microcontroller additionally wide suitable characteristics such as speed, torque, current consumption and device acceleration as well optional tool type and size determined and for optimal and safe operation considered in accordance with the readable by the microcontroller operating data map.
Bei der Bestimmung des Sollwertes der Schlagleistung über die Axialkraft am Handgriff des Handwerkzeuggerätes wirkt sich, vermittelt über dessen Arbeitsrichtung und Masse sowie die Erdbeschleunigung, dessen Eigengewicht verfälschend aus. Um diesen störenden Einfluss zu vermindern, ist durch Neigungssensoren die Arbeitsrichtung bestimmbar und bei bekanntem Eigengewicht über den Mikrocontroller der wahre, vom Nutzer gewünschte, Sollwert der Schlagleistung berechenbar. Dazu ist der Neigungssensor mit dem Mikrokontroller verbunden, welcher die real gemessene Axialkraft am Handgriff um die Haltekraft korrigiert, welche dem Eigengewicht des Handwerkzeuggerätes multipliziert mit dem Richtungskosinus der Arbeitsrichtung des Elektrohandwerkzeuggerätes zur Erdbeschleunigung entspricht.When determining the setpoint of the impact power over the axial force on the handle of Hand tool device affects, conveys about the direction and mass as well as the gravitational acceleration, its own weight falsifying. To this disturbing To reduce influence, the working direction can be determined by tilt sensors and at known weight over the microcontroller the true, desired by the user, Setpoint of the percussion power can be calculated. This is the inclination sensor with the Microcontroller connected, which the real measured axial force on the handle to the Holding force corrected, which multiplies the weight of the hand tool with the direction cosine of the working direction of the electric hand tool device for Acceleration corresponds to.
Die Erfindung wird nachfolgend näher erläutert anhand von:
Nach Fig. 1 ist zur Transformation einer Drehbewegung ω einer Antriebswelle 1 in eine dazu
senkrechte Schwingbewegung ν parallel zu einer in einer Ebene der Antriebswelle 1
liegenden Werkzeugachse A ein schlagerzeugendes Mittel 2, bspw. ein Erregerkolben in
einem pneumatischen Schlagwerk, über einen Pleuel 3 mit einem auf der durch eine
Einstellung α als Sonderfall einer allgemeinen Zykloidenbahn bestimmten Geraden angeordneten
Zapfen 4 eines zykloiden Planetengetriebes 5 verbunden. Somit wird, ausgehend von
einer senkrecht zur Ebene verlaufenden Hin- und Herbewegung des Zapfens 4 über eine
Einstellung α des Planetengetriebes 5 von α=[0, π/2], die monotone stetige Änderung der
Amplitude der Hin- und Herbewegung des schlagerzeugenden Mittels 2 im Bereich von fast
Null (bis auf eine durch die Trigonometrie bei endlicher Pleuellänge bestimmte Restbewegung)
bis zum maximalen Betrag des Bahndurchmessers des Planetengetriebes 5 ermöglicht,
wobei die Amplitude genähert proportional dem Sinus der Einstellung α ist. Bezüglich
einer bestimmten Drehzahl ist somit über die Einstellung α die Amplitude der Schwingung ν
und somit die Schlagenergie stetig einstellbar. Eine Leerschlagabschaltung mit einer
Amplitude von nahe Null ist von dieser Lösung mitumfasst.According to Fig. 1 is for the transformation of a rotational movement ω of a
Nach Fig. 2 ist das Planetengetriebe 5 derart ausgeführt, dass das stetig drehfest einstellbare
Sonnenrad 6 als ein innenverzahntes Hohlrad mit dem Durchmesser 2r ausgeführt ist,
in welchem ein aussenverzahntes Planetenrad 7 mit dem Durchmesser r abläuft. Wird über
die Antriebswelle 1 die Drehachse des Planetenrades 7 angetrieben, beschreibt der am
radial äusseren Rand des Planetenrades 7 angebrachte Zapfen 4 eine geradlinige Hin- und
Herbewegung als Sonderfall einer allgemeinen Zykloidenbahn. Über die Einstellung α des
drehfest einstellbaren Sonnenrades 6 kann die Richtung dieser geradlinigen Hin- und
Herbewegung stetig verändert werden.According to Fig. 2, the
Nach Fig. 3 ist am Umfang des Sonnenrades 6 des Planetengetriebes 5 ein selbsthemmender
Schneckentrieb 9 angeordnet. Zur Einstellung α des drehfest einstellbaren Sonnenrades
6 wird die Axialkraft F über einen am Gehäuse 10 des Elektrohandwerkzeuggerätes 8
befestigten Piezokraftsensor 12 gemessen und über die Messelektronik einem Mikrocontroller
13 als Sollwert zugeführt, welcher über eine geeignete nichtlineare Abbildung der
Axialkraft F in die zur Realisierung der notwendigen Schlagleistung erforderliche Einstellung
α des Planetengetriebes 5 diese berechnet und die Einstellung α des Planetengetriebes 5
gegen das Gehäuse 10 über ein mit dem selbsthemmenden Schneckentrieb 9 verbundenen
Stellmotor 14 vornimmt. Ein dem Mikrocontroller 13 zugeordneter Neigungssensor 15
bestimmt zur Korrektur des Sollwertes zu F bei bekanntem Eigengewicht die Arbeitsrichtung
A des Elektrohandwerkzeuggerätes 8. Ein Betriebsdatensensor 16 bestimmt die Drehzahl
und das Drehmoment der Antriebswelle 1, um über ein für den Mikrocontroller 13 lesbares
Betriebsdatenkennfeld die jeweils optimale bzw. eine der Axialkraft F zugeordnete Schlagamplitude
bestimmen zu können. Dabei können vorteilhaft noch weitere Betriebsparameter
bestimmt und bei der Berechnung berücksichtigt werden.According to Fig. 3 is a self-locking on the circumference of the
Somit werden in einem ersten Schritt über Betriebsdatensensoren 16 die aktuellen Betriebsdaten
des Elektrohandwerkzeuggerätes 8 erfasst und dem Mikrocontroller 13 lesbar zur
Verfügung gestellt. In einem zweiten Schritt werden vom Mikroprozessor 13 unter Berücksichtigung
der Betriebsdaten aus dem manuell vorgegebenen, vorteilhaft über Neigungssensoren
15 und vom Mikroprozessor 13 korrigierten, Sollwert für die Schlagleistung diese
Schlagleistung oder alternativ die optimale Schlagleistung über eine in dem Betriebsdatenkennfeld,
zumindest an Stützstellen lesbar, hinterlegte Abbildung in eine zur Erzielung dieser
Schlagleistung über die Schlagamplitude erforderlichen Einstellung α umgerechnet. In einem
dritten Schritt werden vom Mikroprozessor 13 die Änderungen dieser Einstellung α am
Planetengetriebe 5 über einen Stellmotor 14 vorgenommen. In einem vorteilhaften letzten
Schritt wird vom Mikrocontroller 13 aus den von Sensoren erfassten weiteren Kennwerten
eine tatsächliche Schlagleistung berechnet, diese mit dem Sollwert verglichen und die
Einstellung α am Planetengetriebe 5 entsprechend dem Vergleichswert gegengeregelt.Thus, in a first step via
Claims (9)
- Percussion electro-handtool (8) with a handle (11) and planetary gearing (5) disposed in a housing (10), for changing the rotational movement (ω) of a drive shaft (1) into an oscillation (ν), whereby the percussion amplitude of the forward and backward movement of an impacting means (2) can be adjusted by means of a setting (α) of a sun wheel (6) of the planetary gearing (5), characterized in that control of the setting (d) of the percussion amplitude occurs by means of an axial force (F) applied manually by means of a handle (11) of the handtool (8).
- Electro-handtool in accordance with claim 1, characterized in that the percussion amplitude of the forward and backward movement of the impacting means (2) can be set to be continuously monotonous in the area where (α) = [0, π/2] of the setting of the sun wheel (6).
- Electro-handtool in accordance with claim 1 or 2, characterized in that, with the setting (α) = 0, a blank-blow disconnection with a percussion amplitude of approximately zero is implemented.
- Electro-handtool in accordance with one of the above claims, characterized in that the impacting means (2) is implemented as an excitant piston of a pneumatic striking mechanism.
- Electro-handtool in accordance with one the above claims, characterized in that in order to change the percussion amplitude, the rotationally fixed bearing of the sun wheel (6) can be adjusted, in relation to the housing (10), by means of a self-locking worm gear (9).
- Electro-handtool in accordance with one of the above claims, characterized in that the rotationally fixed support of the sun wheel (6) in relation to the housing (10) can, in order to change the percussion amplitude, be controlled by means of an adjusting motor (14) or other servo-control means.
- Electro-handtool in accordance with claim 6, characterized in that the adjusting motor (14) or the servo-control means are controlled by a microcontroller (13) that, optionally by use of an operating data sensor (16) and a readable operating-data performance graph, optimally sets or regulates the percussion capacity.
- Electro-handtool in accordance with claim 7, characterized in that the microcontroller (13) has an inclination sensor (15) associated with it that determines the direction in which the electro-handtool works, whereby the true, required value for the percussion capacity, not falsified by the acceleration due to gravity, can be calculated, from the axial force (F) on the handle (11), by means of the microcontroller (13).
- Electro-handtool in accordance with one of the above claims, characterized in that the handle (11) is supported, such that it can rotate to a certain extent outside of and transversely in relation to the tool axis A, and is pre-stressed with an axial pressure, whereby the handle can, by means of the axial force (F), move axially to a certain extent.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10034359A DE10034359A1 (en) | 2000-07-14 | 2000-07-14 | Hitting electric hand tool device |
| DE10034359 | 2000-07-14 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1172180A2 EP1172180A2 (en) | 2002-01-16 |
| EP1172180A3 EP1172180A3 (en) | 2003-10-29 |
| EP1172180B1 true EP1172180B1 (en) | 2005-05-25 |
Family
ID=7648972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01810652A Expired - Lifetime EP1172180B1 (en) | 2000-07-14 | 2001-07-04 | Percussion electrohandtool apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6520266B2 (en) |
| EP (1) | EP1172180B1 (en) |
| JP (1) | JP2002079476A (en) |
| CN (1) | CN1181953C (en) |
| DE (2) | DE10034359A1 (en) |
| ZA (1) | ZA200105752B (en) |
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-
2000
- 2000-07-14 DE DE10034359A patent/DE10034359A1/en not_active Withdrawn
-
2001
- 2001-07-04 EP EP01810652A patent/EP1172180B1/en not_active Expired - Lifetime
- 2001-07-04 DE DE50106293T patent/DE50106293D1/en not_active Expired - Lifetime
- 2001-07-06 CN CNB011224517A patent/CN1181953C/en not_active Expired - Fee Related
- 2001-07-11 US US09/902,676 patent/US6520266B2/en not_active Expired - Lifetime
- 2001-07-12 ZA ZA200105752A patent/ZA200105752B/en unknown
- 2001-07-16 JP JP2001215530A patent/JP2002079476A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011080374A1 (en) * | 2011-08-03 | 2013-02-07 | Robert Bosch Gmbh | Machine tool e.g. hand tool such as demolition hammer, has load control unit that is provided to directly or indirectly evaluate its contact pressure with workpiece |
| CN105459029A (en) * | 2014-07-28 | 2016-04-06 | 博世电动工具（中国）有限公司 | Handheld electric tool |
| DE102017209830A1 (en) * | 2017-06-12 | 2018-12-13 | Robert Bosch Gmbh | Hand tool |
Also Published As
| Publication number | Publication date |
|---|---|
| US6520266B2 (en) | 2003-02-18 |
| JP2002079476A (en) | 2002-03-19 |
| EP1172180A2 (en) | 2002-01-16 |
| DE50106293D1 (en) | 2005-06-30 |
| ZA200105752B (en) | 2002-01-22 |
| CN1181953C (en) | 2004-12-29 |
| EP1172180A3 (en) | 2003-10-29 |
| US20020056558A1 (en) | 2002-05-16 |
| CN1333100A (en) | 2002-01-30 |
| DE10034359A1 (en) | 2002-01-24 |
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