EP1151827A1 - Hand tool with electrical percussion system - Google Patents

Hand tool with electrical percussion system Download PDF

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Publication number
EP1151827A1
EP1151827A1 EP01810391A EP01810391A EP1151827A1 EP 1151827 A1 EP1151827 A1 EP 1151827A1 EP 01810391 A EP01810391 A EP 01810391A EP 01810391 A EP01810391 A EP 01810391A EP 1151827 A1 EP1151827 A1 EP 1151827A1
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EP
European Patent Office
Prior art keywords
assembly
hand tool
tool device
electric hand
vibration
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Granted
Application number
EP01810391A
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German (de)
French (fr)
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EP1151827B1 (en
Inventor
Ferdinand Kristen
Hans-Werner Bongers-Ambrosius
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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 EP1151827A1 publication Critical patent/EP1151827A1/en
Application granted granted Critical
Publication of EP1151827B1 publication Critical patent/EP1151827B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2211/006—Parallel drill and motor spindles
    • 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
    • B25D2250/121—Housing details
    • 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

Definitions

  • the invention relates to an at least partially striking electric hand tool device, for example a hammer drill or a chisel hammer, preferably with a pneumatic one Percussion.
  • damping of this recoil energy by a relative movement of two assemblies with the interposition of a damping element depends principally on the dissipative Share of the deformation energy of the damping element decreases and increases in particular both with the deformation force amplitude and with the deformation path amplitude.
  • the object of the invention is to further minimize the vibrations when striking Electric hand tools.
  • Another aspect of this invention is in Realization of a low-wear drive chain between two relative to each other movable, vibration-decoupled assemblies of the handheld power tool
  • the vibration-decoupled second assembly contains the Stator of the electric drive and the housing.
  • the mass ratio of the two assemblies in the direction of a relatively larger Mass of the first assembly shifted, including towards a mass equality of both assemblies.
  • Damping elements made of viscoelastic material are advantageously used, which with the vibration frequency in the working temperature range of the electric hand tool a lot Dissipate energy.
  • the drive chain for the impact generation and / or rotary movement of the electric hand tool has a low-wear coupling means with respect to the relative movement, which as a torque-locking clutch by a magnetic rotating field of the stator is formed on an axially movable, brushless rotor.
  • a low-wear coupling means with respect to the relative movement, which as a torque-locking clutch by a magnetic rotating field of the stator is formed on an axially movable, brushless rotor.
  • a brushless rotor also eliminates those that wear out during an axial movement Collectors.
  • Fig. 1 as a striking electric hand tool device.
  • a striking electric hand tool device 1 has a bearing, For example, sliding or rolling bearings, limited along a tool axis A, for example 10 mm, movable first assembly with a striking mechanism 2, which one, a back and forth movement executing exciter piston 3, with a transformation gear 4, which includes an eccentric and two right-angled bevel gears, and with one rotatable about a rotor axis B parallel to the first vibration I of the first assembly and along this axially displaceable, collectorless rotor 5 of an electric drive and a second assembly with the second vibration II, which has a housing 6, a Stator 7 of the electric drive and the associated electric drive electronics 8 includes and relative to the first assembly via a prestressed elastic spring 9, for example Spiral compression spring, with a damping element 10 connected in parallel, made of viscoelastic Material with respect to the vibrations 1, II is vibration decoupled.
  • a prestressed elastic spring 9 for example Spiral compression spring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

The tool has a first unit containing an impact mechanism (2) that is mounted in a second unit with a housing so as to be movable along a tool axis (A) to a limited extent. The first unit has an electric drive with a rotor (5) rotatable about a rotor axis oriented parallel to a vibration direction of the first unit. The first unit contains a transformation gearbox and the second unit contains at least a stator ( and ) of the electric drive.

Description

Die Erfindung bezeichnet ein zumindest teilweise schlagendes Elektrohandwerkzeuggerät, bspw. einen Bohrhammer oder einen Meisselhammer, mit vorzugsweise einem pneumatischen Schlagwerk.The invention relates to an at least partially striking electric hand tool device, for example a hammer drill or a chisel hammer, preferably with a pneumatic one Percussion.

Elektrohandwerkzeuggeräte mit pneumatischem Schlagwerk benutzen zur Erzeugung des Schlages eine hin- und hergehende schwingende Bewegung, welche auf eine Gasfeder zwischen einem in einem Hohlzylinder dichtend relativ zu diesem beweglichen Erregerkolben und einem distanzierten in Richtung der Werkzeugachse dichtend beweglichen Schlagmittel aufgebracht wird. Dazu wird die Drehbewegung eines Elektroantriebs zumindest teilweise mittels geeigneter Transformationsgetriebe, meist Exzenter- oder Taumelschwinger, in eine Hin- und Herbewegung des Erregerkolbens transformiert. Bei zweckentsprechender Benutzung wirkt im Kraftweg die in Werkzeugrichtung axiale Gegenkraft als Rückstoss des Schlages über das Werkzeug, das Schlagwerk, das Transformationsgetriebe und dessen Lagerung auf das Gehäuse und verursacht störende Vibrationen bei dem, die Kraft aufbringenden, Benutzer.Use electric hand tools with pneumatic striking mechanism to generate the Strikes a back and forth swinging movement, which on a gas spring between a sealing piston in a hollow cylinder relative to this movable exciter piston and a distant impact means that can move in a sealing manner in the direction of the tool axis is applied. For this purpose, the rotary movement of an electric drive is at least partially by means of suitable transformation gears, usually eccentric or wobble, in one The reciprocation of the exciter piston is transformed. When used appropriately acts in the force path the axial counterforce in the tool direction as recoil of Strike over the tool, the striking mechanism, the transformation gear and its Bearing on the housing and causes disruptive vibrations in the force-applying User.

Es ist aus der Physik der erzwungenen Amplitudenschwingungen eines Federpendels prinzipiell bekannt, dass besonders hohe Vibrationsamplituden im mechanischen Resonanzfall auftreten bzw. umgekehrt die Vibrationsamplituden durch weit auseinander liegende Eigen- und Vibrationsfrequenzen wirkungsvoll gedämpft werden können. In die Eigenfrequenz eines Federpendels geht die Schwingmasse und die Federkonstante ein, welche im Nutzungsfall bei einem einfachen schlagenden Elektrohandwerkzeuggerät durch dessen Masse und die Federkonstante des Nutzers bei der Handhabung ausgebildet wird. Abhängig von der Schlagzahl als Vibrationsfrequenz stellt sich demnach eine bestimmte Vibrationsamplitude des Elektrohandwerkzeuggeräts ein.It is from the physics of the forced amplitude vibrations of a spring pendulum known in principle that particularly high vibration amplitudes in the case of mechanical resonance occur or vice versa the vibration amplitudes by widely spaced Natural and vibration frequencies can be effectively damped. In the natural frequency a spring pendulum receives the vibrating mass and the spring constant, which in Use case with a simple striking electric hand tool device by the Mass and the spring constant of the user is formed during handling. Dependent a certain vibration amplitude arises from the beat number as the vibration frequency of the handheld power tool.

Nach der US3918535 wird in den Kraftweg zwischen dem axial verschiebbaren Schlagwerk und dem Gehäuse eine, zur Verlagerung des Arbeitspunktes vorgespannte, Druckfeder vorgesehen, welche die erste axial verschiebbare Baugruppe des Schlagwerks von der zweiten Baugruppe mit dem Gehäuse teilweise schwingungsentkoppelt und über die dadurch entstehende Relativbewegung dieser Baugruppe zum Gehäuse über Dämpfungselemente gedämpft werden kann. Das somit zwangsläufig entstandene System zweier gekoppelter gleichgerichteter Schwinger beinhaltet eine relativ kleine Masse der Baugruppe des Schlagwerks, welches durch den Rückstoss des Schlages somit stark schwingt. Die relativ grössere Masse der zweiten Baugruppe mit dem Gehäuse führt, abhängig von deren Eigenfrequenz, eine erzwungene Schwingung mit geringerer Vibrationsamplitude aus.According to US3918535 is in the force path between the axially movable hammer mechanism and the housing a compression spring biased to shift the operating point provided which the first axially displaceable assembly of the striking mechanism of the second assembly with the housing partially vibration isolated and over the resulting relative movement of this assembly to the housing via damping elements can be dampened. The inevitably created system of two coupled rectified oscillator contains a relatively small mass of the assembly of the striking mechanism, which swings strongly due to the recoil of the blow. The leads relatively larger mass of the second assembly with the housing, depending on their Natural frequency, a forced vibration with a lower vibration amplitude.

Die Dämpfung dieser Rückstossenergie durch eine Relativbewegung zweier Baugruppen unter Zwischenschaltung eines Dämpfungselements hängt prinzipiell von dem dissipativen Anteil der Deformationsenergie des Dämpfungselementes ab und steigt insbesondere sowohl mit der Deformationskraftamplitude als auch mit der Deformationswegamplitude.The damping of this recoil energy by a relative movement of two assemblies with the interposition of a damping element depends principally on the dissipative Share of the deformation energy of the damping element decreases and increases in particular both with the deformation force amplitude and with the deformation path amplitude.

Nach der US5927407 werden bei den Dämpfungselementen zur Reduzierung der Vibrationen der schwingungsmässig entkoppelten Baugruppen von Handwerkzeuggeräten sechs, in axialer Richtung dämpfende, Elastomerbauteile verwendet, welche bezüglich ihrer viscoelastischen Energiedissipation auf die Vibrationsfrequenz optimiert sind. Eine derartige Lösung vermindert die Vibrationsamplitude nur relativ zum Fall ohne Dämpfungselemente.According to US5927407 are used in the damping elements to reduce vibrations the vibrationally decoupled assemblies of hand tools six, in Axial damping, elastomer components used, which in terms of their viscoelastic Energy dissipation are optimized to the vibration frequency. Such Solution only reduces the vibration amplitude relative to the case without damping elements.

Die Aufgabe der Erfindung besteht in der weiteren Minimierung der Vibrationen bei schlagenden Elektrohandwerkzeuggeräten. Ein weiterer Aspekt dieser Erfindung besteht in der Realisierung einer verschleissarmen Antriebskette zwischen zwei relativ zueinander beweglichen, schwingungsentkoppelten Baugruppen des ElektrohandwerkzeuggerätesThe object of the invention is to further minimize the vibrations when striking Electric hand tools. Another aspect of this invention is in Realization of a low-wear drive chain between two relative to each other movable, vibration-decoupled assemblies of the handheld power tool

Die Aufgabe wird im wesentlichen durch die Merkmale der unabhängigen Ansprüche gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.The task is essentially solved by the features of the independent claims. Advantageous further developments result from the subclaims.

Im wesentlichen beinhaltet eine, längs der Werkzeugachse begrenzt axial bewegliche, erste Baugruppe neben dem Schlagwerk einen, um eine parallel zur Vibration der ersten Baugruppe orientierten Rotorachse drehbaren, Rotor des Elektroantriebs sowie vorteilhaft ein Transformationsgetriebe. Die schwingungsentkoppelte zweite Baugruppe beinhaltet den Stator des Elektroantriebs und das Gehäuse.Essentially includes a first that is axially movable along the tool axis Assembly next to the striking mechanism one by one parallel to the vibration of the first Assembly-oriented rotor axis rotatable, rotor of the electric drive as well as advantageous a transformation gear. The vibration-decoupled second assembly contains the Stator of the electric drive and the housing.

Dadurch vergrössert sich die schwingungstechnisch zu beachtende Masse der ersten Baugruppe, welche die Masse des Schlagwerks, des Transformationsgetriebes und des Rotors addiert, relativ zur grösseren Masse der zweiten Baugruppe, welche die Masse des Stators und des Gehäuses sowie optional die Masse der Elektroantriebselektronik addiert. Durch die nunmehr absolut höhere Masse der ersten Baugruppe reduziert sich die durch die gleiche Rückstossenergie erzeugte Vibrationsamplitude der ersten Baugruppe. This increases the vibration-related mass of the first Assembly which the mass of the striking mechanism, the transformation gear and the Rotor adds, relative to the larger mass of the second assembly, which is the mass of the Stator and the housing and optionally the mass of the electric drive electronics added. The mass of the first assembly, which is now absolutely higher, reduces that due to the same recoil energy generated vibration amplitude of the first assembly.

Zudem wird das Massenverhältnis beider Baugruppen in Richtung zu einer relativ grösseren Masse der ersten Baugruppe verschoben, einschliesslich in Richtung auf eine Massengleichheit beider Baugruppen. Somit kann durch ein zwischen beiden Baugruppen angeordnetes Dämpfungselement mehr Rückstossenergie dissipiert werden, wodurch die Vibrationsamplitude der zweiten Baugruppe mit dem Gehäuse vermindert wird.In addition, the mass ratio of the two assemblies in the direction of a relatively larger Mass of the first assembly shifted, including towards a mass equality of both assemblies. Thus, one can be arranged between the two assemblies Damping element more recoil energy are dissipated, reducing the vibration amplitude the second assembly with the housing is reduced.

Vorteilhaft werden Dämpfungselemente aus viscoelastischem Material verwendet, welches bei der Vibrationsfrequenz im Arbeitstemperaturbereich des Elektrohandwerkzeugs viel Energie dissipieren.Damping elements made of viscoelastic material are advantageously used, which with the vibration frequency in the working temperature range of the electric hand tool a lot Dissipate energy.

Die Antriebskette für die Schlagerzeugung und/oder Drehbewegung des Elektrohandwerkzeugs weist ein verschleissarmes Kupplungsmittel bezüglich der Relativbewegung auf, welche als drehmomentschlüssige Kupplung durch ein magnetisches Drehfeld des Stators auf einen axial beweglichen, kollektorlosen Rotor ausgebildet wird. Insbesondere werden keine mechanischen kraftübertragenden, und somit verschleissanfälligen, Kupplungsmittel zum Ausgleich der Relativbewegung zwischen beiden Baugruppen benötigt. Bei einem kollektorlosen Rotor entfallen zudem die bei einer axialen Bewegung verschleissenden Kollektoren.The drive chain for the impact generation and / or rotary movement of the electric hand tool has a low-wear coupling means with respect to the relative movement, which as a torque-locking clutch by a magnetic rotating field of the stator is formed on an axially movable, brushless rotor. In particular, be no mechanical force-transmitting and therefore wear-prone coupling means needed to compensate for the relative movement between the two assemblies. At a brushless rotor also eliminates those that wear out during an axial movement Collectors.

Die Erfindung wird bezüglich eines vorteilhaften Ausführungsbeispiels näher erläutert mit: Fig. 1 als schlagendes Elektrohandwerkzeuggerät.The invention is explained in more detail with respect to an advantageous exemplary embodiment with: Fig. 1 as a striking electric hand tool device.

Nach Fig. 1 weist ein schlagendes Elektrohandwerkzeuggerät 1 eine über Lagerungen, bspw. Gleit- oder Wälzlager, längs einer Werkzeugachse A begrenzt, bspw. 10 mm, bewegliche erste Baugruppe mit einem Schlagwerk 2, welches einen, eine Hin- und Herbewegung ausführenden, Erregerkolben 3 beinhaltet, mit einem Transformationsgetriebe 4, welches einen Exzenter und zwei rechtwinkelig ineinandergreifende Kegelräder beinhaltet, und mit einem, parallel zur ersten Vibration I der ersten Baugruppe um eine Rotorachse B drehbaren und längs dieser begrenzt axial verschiebbaren, kollektorlosen Rotor 5 eines Elektroantriebs sowie eine zweite Baugruppe mit der zweiten Vibration II auf, welche ein Gehäuse 6, einen Stator 7 des Elektroantriebs und die zugeordnete Elektroantriebselektronik 8 beinhaltet und relativ zur ersten Baugruppe über eine vorgespannte elastische Feder 9, bspw. eine Spiraldruckfeder, mit einem dazu parallel geschalteten Dämpfungselement 10 aus viscoelastischem Material bezüglich der Vibrationen 1, II schwingungsentkoppelt ist.1, a striking electric hand tool device 1 has a bearing, For example, sliding or rolling bearings, limited along a tool axis A, for example 10 mm, movable first assembly with a striking mechanism 2, which one, a back and forth movement executing exciter piston 3, with a transformation gear 4, which includes an eccentric and two right-angled bevel gears, and with one rotatable about a rotor axis B parallel to the first vibration I of the first assembly and along this axially displaceable, collectorless rotor 5 of an electric drive and a second assembly with the second vibration II, which has a housing 6, a Stator 7 of the electric drive and the associated electric drive electronics 8 includes and relative to the first assembly via a prestressed elastic spring 9, for example Spiral compression spring, with a damping element 10 connected in parallel, made of viscoelastic Material with respect to the vibrations 1, II is vibration decoupled.

Claims (10)

Elektrohandwerkzeuggerät zur Erzeugung einer zumindest schlagenden Bewegung eines Werkzeugs, mit einer, ein Schlagwerk (2) beinhaltenden, ersten Baugruppe, welche in einer, ein Gehäuse (6) aufweisenden, zweiten Baugruppe längs einer Werkzeugachse (A) begrenzt beweglich gelagert ist, dadurch gekennzeichnet, dass die erste Baugruppe einen, um eine parallel zu einer Vibration (I) der ersten Baugruppe orientierten Rotorachse (B) drehbaren, Rotor (5) eines Elektroantriebs aufweist.Electric hand tool device for generating an at least striking movement of a tool, with a first assembly containing an impact mechanism (2), which is mounted in a second assembly with a housing (6) and has limited movement along a tool axis (A), characterized in that that the first assembly has a rotor (5) of an electric drive that is rotatable about a rotor axis (B) oriented parallel to a vibration (I) of the first assembly. Elektrohandwerkzeuggerät nach Anspruch 1, dadurch gekennzeichnet, dass die erste Baugruppe ein Transformationsgetriebe aufweist.Electric hand tool device according to claim 1, characterized in that the first assembly has a transformation gear. Elektrohandwerkzeuggerät nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass die zweite Baugruppe zumindest einen Stator (7) des Elektroantriebs aufweist.Electric hand tool device according to claim 1 or claim 2, characterized in that the second assembly has at least one stator (7) of the electric drive. Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die zweite Baugruppe eine Elektroantriebselektronik (8) aufweist.Electric hand tool device according to one of the preceding claims, characterized in that the second assembly has an electric drive electronics (8). Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Rotor (5) kollektorlos ausgebildet ist.Electric hand tool device according to one of the preceding claims, characterized in that the rotor (5) is designed without a collector. Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Masse der ersten Baugruppe und die Masse der zweiten Baugruppe im wesentlichen gleich gross sind.Electric hand tool device according to one of the preceding claims, characterized in that the mass of the first assembly and the mass of the second assembly are substantially the same size. Elektrohandwerkzeuggerät nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die erste Baugruppe mit der zweiten Baugruppe über eine elastische Feder (9) schwingungsentkoppelt verbunden ist.Electric hand tool device according to one of the preceding claims, characterized in that the first assembly is connected to the second assembly via an elastic spring (9) in a vibration-decoupled manner. Elektrohandwerkzeuggerät nach Anspruch 7, dadurch gekennzeichnet, dass der Feder (9) ein Dämpfungselement (10) parallel zugeschaltet ist.Electric hand tool device according to claim 7, characterized in that the spring (9) is connected to a damping element (10) in parallel. Elektrohandwerkzeuggerät nach Anspruch 8, dadurch gekennzeichnet, dass das Dämpfungselement (10) aus viscoelastischem Material besteht. Electric hand tool device according to claim 8, characterized in that the damping element (10) consists of viscoelastic material. Elektrohandwerkzeuggerät nach Anspruch 9, dadurch gekennzeichnet, dass bei Arbeitstemperatur des Elektrohandwerkzeuggerätes (1) das viscoelastische Material bei der Vibrationsfrequenz eine optimale Energiedissipation aufweist.Electric hand tool device according to claim 9, characterized in that at the working temperature of the electric hand tool device (1) the viscoelastic material has an optimal energy dissipation at the vibration frequency.
EP01810391A 2000-05-02 2001-04-23 Hand tool with electrical percussion system Expired - Lifetime EP1151827B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10021355A DE10021355B4 (en) 2000-05-02 2000-05-02 Beating electric hand tool with vibration-decoupled assemblies
DE10021355 2000-05-02

Publications (2)

Publication Number Publication Date
EP1151827A1 true EP1151827A1 (en) 2001-11-07
EP1151827B1 EP1151827B1 (en) 2007-07-25

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EP01810391A Expired - Lifetime EP1151827B1 (en) 2000-05-02 2001-04-23 Hand tool with electrical percussion system

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US (1) US6902012B2 (en)
EP (1) EP1151827B1 (en)
JP (1) JP4778630B2 (en)
CN (1) CN100439043C (en)
DE (2) DE10021355B4 (en)

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JP4778630B2 (en) 2011-09-21
US20010037889A1 (en) 2001-11-08
JP2001353668A (en) 2001-12-25
DE10021355A1 (en) 2001-11-15
DE10021355B4 (en) 2005-04-28
CN1321567A (en) 2001-11-14
EP1151827B1 (en) 2007-07-25
DE50112753D1 (en) 2007-09-06
CN100439043C (en) 2008-12-03
US6902012B2 (en) 2005-06-07

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