EP2180979B1 - Electric handheld power tool - Google Patents

Electric handheld power tool Download PDF

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Publication number
EP2180979B1
EP2180979B1 EP07801768A EP07801768A EP2180979B1 EP 2180979 B1 EP2180979 B1 EP 2180979B1 EP 07801768 A EP07801768 A EP 07801768A EP 07801768 A EP07801768 A EP 07801768A EP 2180979 B1 EP2180979 B1 EP 2180979B1
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EP
European Patent Office
Prior art keywords
output
planet carrier
output shaft
hand tool
tool device
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EP07801768A
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German (de)
French (fr)
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EP2180979A1 (en
Inventor
Chistoph Maier
Arttu Däschler
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Publication of EP2180979A1 publication Critical patent/EP2180979A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools

Definitions

  • the invention relates to an electric hand tool, in particular a drill, in particular a Akkubohrschrauber comprising a gear housing and driven by a drive motor drive shaft which is connected via a switchable planetary gear with an output shaft, wherein the planetary gear comprises a driven side planet carrier.
  • Such an electric hand tool device may in particular be an electric hand tool device with a rotating output.
  • Such electric hand tool devices are in particular next Bohrdrubern Schauber or drills.
  • a corresponding electric hand tool device is for example in the DE 35 25 208 A1 describes a reduction gear with a speed change device for a motor-driven drill comprising a planetary gear, wherein a bearing is provided for the output shaft, which is fixed to the transmission housing.
  • the output shaft is connected to the output-side planet carrier for transmitting the torque.
  • an electric hand tool according to the preamble of claim 1 in the EP 1 726 849 A1 shown having a switchable planetary gear, which connects a drive shaft driven by a drive motor with an output shaft.
  • the output shaft is mounted in a conventional manner at its output end and at its drive end end by suitable bearings, wherein the drive end end additionally extends through a recess in the planet carrier inside.
  • the invention now achieves this object by a drive-side end of the output shaft is guided by means of the output side planet carrier and the output side planet carrier in the transmission housing radially via a radial forces receiving bearing, the is disposed between the output-side planetary carrier and the transmission housing is stored.
  • the radial mounting of the output-side planetary carrier can take place via a roller bearing, in particular via a roller or a ball bearing.
  • the bearing can be performed with respect to its inner ring between a shoulder of the driven side planet carrier and a housing shoulder in the axial direction, wherein the outer ring between the housing shoulder and a fixed ring in the housing can be held in the axial direction.
  • the bearing is arranged coaxially with the output-side planet carrier on the outer circumference.
  • Such a configuration is advantageous because the drive-side end of the output shaft is stabilized by the radial bearing of the planet carrier with the storage of the output shaft to the planet carrier and also undergoes a radial guidance.
  • the drive-side bearing of the output shaft at its be configured outermost drive-side end.
  • the output shaft may be slidably mounted in the output side planet carrier, which in this case has an inner bore which receives the output shaft.
  • a Klemmgesperre between the drive shaft and output shaft is provided to block a rotation transmission from the output shaft to the drive shaft.
  • the provision of a Klemmgesperres offers advantages including the one-handed clamping of tools in a tool chuck, which is connected to the output side end of the output shaft with this.
  • the output-side planetary carrier has driving elements for the Klemmgesperre.
  • the driver elements for the Klemmgesperre can be integrally formed on the output side planet carrier, in particular on the opposite side in the axial direction to the planet of the driven side planet carrier.
  • the Klemmgesperre can otherwise be formed in a conventional form comprising clamping body, in particular cylindrical pinch rollers and corresponding clamping surfaces.
  • the Klemmgesperre serves to allow a rotation transmission from the drive shaft to the output shaft and to block at a torque transmission from the output shaft to the drive shaft and thus prevent co-rotation of the drive shaft, which may possibly lead to damage to the drive motor.
  • the output-side planet carrier at the same time also carries the driver elements of the Klemmgesperres referred to as a spindle lock
  • a radial bearing only over the planet has the consequence that no precise concentricity of the driver elements can be guaranteed. It can then lead to tilting of the driver elements of the Klemmgesperres at certain speeds, so that the driver elements tilt and tilt with other elements of the Klemmgesperres, in particular designed as a cylindrical pins pinch rollers.
  • inventively provided radial support of the output side planet carrier a constant function of the Klemmgesperres can be ensured and the risk that the Klemmgesperre cant or hitting, can be reduced because of the exact concentricity of the driver is guaranteed.
  • the planetary gear in particular has two switching stages.
  • Such a planetary gear is for example in the DE 10 2006 025 583 described and offers a high level of comfort and a long service life, since all the gears are in a corresponding arrangement constantly in engagement, resulting in low wear results.
  • the ring gears of the two gear stages are rotatably connected to each other and are in particular formed as a Doppelhohlrad, wherein the ring gear of the output serving gear stages may have a smaller inner diameter than the ring gear of the other gear stage, the size ratios depending on the desired gear ratios are to choose.
  • a first shift stage (2nd gear)
  • the interconnected ring gears are blocked, so that the planetary carrier not the output switching stages turns freely.
  • the planet gears of the output planetary stage drive the output side planet carrier, so that it drives the output shaft at high speed.
  • the slow gear (1st gear) of the other switching stage however, the planet carrier of the drive-side planetary stage is blocked and the ring gears of the two gear stages, which are rotatably connected to each other, can rotate.
  • the ring gear is driven by a sun gear opposite direction of rotation, resulting in a different rotational or Abrollán the planet of the output side switching stage results and thus a different rotational speed of the driven side planet carrier.
  • an electric hand tool device which is hereby coupled.
  • the sun gears are rotatably coupled together and preferably integrally connected to each other.
  • the sun gears can have the same or a different outer diameter for both gear stages.
  • a switching ring which is axially displaceable so that it cooperates on the one hand with the planet carrier of the drive-side gear stage and on the other with the mutually coupled ring gears of the two gear stages.
  • the switching ring can be equipped for this purpose with a toothing or other engagement elements, which can cooperate with an external toothing or corresponding engagement elements of both the planet carrier of the drive-side gear stage and the ring gears of the gear stages, all of which have the same outer diameter.
  • the switching ring is at the same time rotatably fixed in the housing, for example via a rib which engages in a groove.
  • the switching ring can be connected to a by the user of the electric hand tool device to be operated switching handle, which performs a rotational movement, for example, when switching, which is transferred into the sliding movement of the switching ring.
  • the outer circumference of the output-side planetary carrier in contrast to the outer periphery of the drive-side planetary carrier on no teeth or engagement elements.
  • the drive-side end of the output shaft is slidably mounted in the output-side planet carrier, so there only experiences a radial guidance.
  • a bearing axial and radial forces bearing in particular a rolling bearing, which may be formed as a ball or roller bearings, is mounted. It can be achieved so that the bearings of the output shaft are as far away from each other, and as possible a tilt-free storage of the output shaft can be done. In this way, the axial space of the electric hand tool device can be kept low with stable storage at the same time, which is particularly desirable in drills, but also in drills and screwdrivers.
  • the single figure shows a longitudinal section through a gear housing of an electric hand tool device, in particular a cordless screwdriver, which may be connected to a further housing, for example for receiving an electric motor (not shown).
  • the further housing may also include a handle for guiding the electric hand tool device.
  • the transmission housing is provided with the reference numeral 12.
  • a planetary gear 14 is arranged comprising a Doppelhohlrad 16 for the two gear stages, the Doppelhohlrad 16 planets 18 of the drive-side gear stage and planet 20 of the output-side planetary gear are associated and roll in this.
  • the drive-side planet 18 are connected to a drive-side planet carrier 22, which carries the planet 18.
  • the planet 20 of the output-side gear stage are connected to a driven side planet carrier 24 and are also supported by this bolt 26.
  • the sun gear is here provided with the reference numeral 30 and is rotatably connected to the drive shaft 32.
  • the drive shaft 32 is at its right end in the illustration with a motor (not shown), in particular an electric motor of the electric hand tool device coupled.
  • the planetary gear 14 also includes a switching ring 34 which is axially displaceable in the direction of arrow 36, wherein it blocks the planet carrier 22 of the drive-side switching stage in the illustration shown by the switching ring 34 with the external teeth of the drive-side planetary carrier 22 is engaged and fixed in the transmission housing 22, for example, by means of a rib which engages in a groove is fixed.
  • a switching handle 38 is provided, which is designed as a rotary knob and thus a rotational movement in a sliding movement of the Wegrings 34 translated.
  • the corresponding electric hand tool device with two switching stages is in slow gear, which is done by moving the switching ring 34 in the region of the ring gear 16 and thus blocking the ring gear 16 against rotation in a fast transition.
  • the driven-side planetary carrier 24 further carries driving elements 40 of a Klemmgesperres 42 which is formed so that a rotation transmission from the drive shaft 32 to an output shaft 44 is possible, however, a rotation transmission from the output shaft 44 is blocked on the drive shaft 32 by the Klemmgesperre 42.
  • the Klemmgesperre cylindrical rollers 46 as clamping rollers which are clamped in the case of clamping between the gear housing 12 and an inner clamping heart 50 and thus block the torque transmission.
  • roller bearing 52 is in this case arranged between the gear housing 12 and the output-side planetary carrier 24 and thus serves for radial stabilization, which would otherwise only take place via the planets 20, which would thus be subject to greater wear.
  • the bearing of the drive-side end 58 of the output shaft 44 takes place slidably in the output-side planet carrier 24, which for this purpose has an inner bore which receives the output shaft 44. Furthermore, it is provided that the output-side end 54 of the output shaft 44 by means of a roller bearing 56, both axial and radial forces to take up, to store. In this way it can be achieved that, despite the short length of the output shaft 44, the bearings on the output shaft 44 are arranged as far apart as possible, so as to provide a stable mounting of the output shaft and prevent tilting the same, resulting in a designated Klemmgesperre 42 to a Hitting the Klemmgesperres can lead. Due to the mounting of the output-side planetary carrier 24, the concentricity of the planetary carrier can be better ensured, regardless of the application situation.
  • a comparatively short construction gear assembly for a power tool with rotating output in particular a screwdriver, drill or drill can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)
  • Portable Power Tools In General (AREA)

Abstract

The invention relates to an electric handheld power tool, in particular a power screwdriver, comprising a gearbox (12) and a drive shaft (32), which is driven by a drive motor and is connected to a driven shaft (44) by means of an engaging and disengaging planetary gear mechanism (14), wherein the planetary gear mechanism (14) comprises a planet carrier (24) on the driven side, wherein an end (58) of the driven shaft (44) on the drive side is led through the planet carrier (24) on the driven side and the planet carrier (24) on the driven side is radially mounted in the gearbox (12).

Description

Die Erfindung betrifft ein Elektrohandwerkzeuggerät, insbesondere einen Bohrschrauber, insbesondere einen Akkubohrschrauber, umfassend ein Getriebegehäuse sowie eine von einem Antriebsmotor angetriebene Antriebswelle, die über ein schaltbares Planetengetriebe mit einer Abtriebswelle verbunden ist, wobei das Planetengetriebe einen abtriebsseitigen Planetenträger umfasst.The invention relates to an electric hand tool, in particular a drill, in particular a Akkubohrschrauber comprising a gear housing and driven by a drive motor drive shaft which is connected via a switchable planetary gear with an output shaft, wherein the planetary gear comprises a driven side planet carrier.

Bei einem solchen Elektrohandwerkzeuggerät kann es sich insbesondere um ein Elektrohandwerkzeuggerät mit drehendem Abtrieb handeln.Such an electric hand tool device may in particular be an electric hand tool device with a rotating output.

Derartige Elektrohandwerkzeuggeräte sind insbesondere neben Bohrschraubern Schauber oder Bohrer.Such electric hand tool devices are in particular next Bohrdrubern Schauber or drills.

Ein entsprechendes Elektrohandwerkzeuggerät ist beispielsweise in der DE 35 25 208 A1 beschrieben, die ein Untersetzungsgetriebe mit einer Drehzahlwechselvorrichtung für einen motorbetriebenen Bohrer beschreibt umfassend ein Planetengetriebe, wobei ein Lager für die Abtriebswelle vorgesehen ist, dass am Getriebegehäuse befestigt ist. Hierbei ist zur Übertragung des Drehmoments die Ausgangswelle mit dem abtriebsseitigen Planetenträger verbunden.A corresponding electric hand tool device is for example in the DE 35 25 208 A1 describes a reduction gear with a speed change device for a motor-driven drill comprising a planetary gear, wherein a bearing is provided for the output shaft, which is fixed to the transmission housing. Here, the output shaft is connected to the output-side planet carrier for transmitting the torque.

Des Weiteren ist aus der DE 197 05 378 A1 ein Kupplungsmechanismus zur Verwendung mit einem energiebetriebenen Werkzeug bekannt, wobei hier die Abtriebswelle über zwei dicht beieinander liegende Lagerstellen gelagert ist, so dass die Gefahr besteht, dass es zu einem Verkippen der Bohrspindel im Bohrbetrieb kommt und darüber hinaus zusätzlicher Bauraum für die Axialsowie die Radiallagerung der Abtriebsspindel im Gehäuse benötigt wird.Furthermore, from the DE 197 05 378 A1 a clutch mechanism for use with an energy-operated tool known, in which case the output shaft is mounted on two closely spaced bearings, so that there is a risk that There is a tilting of the drill spindle in drilling operation and beyond additional space for the Axialsowie radial bearing of the output spindle is required in the housing.

Schließlich ist auch ein Elektrohandwerkzeug entsprechend dem Oberbegriff von Anspruch 1 in der EP 1 726 849 A1 gezeigt, das ein schaltbares Planetengetriebe aufweist, welches eine von einem Antriebsmotor angetriebene Antriebswelle mit einer Abtriebswelle verbindet. Die Abtriebswelle ist dabei in üblicher Weise an ihrem abtriebsseitigen Ende sowie an ihrem antriebsseitigen Ende durch geeignete Lager gelagert, wobei sich das antriebsseitige Ende zusätzlich durch eine Ausnehmung in den Planetenträger hinein erstreckt. Auch bei dieser bekannten Vorrichtung tritt jedoch das Problem auf, dass es zu einem Verkippen der Bohrspindel im Bohrbetrieb kommen kann.Finally, an electric hand tool according to the preamble of claim 1 in the EP 1 726 849 A1 shown having a switchable planetary gear, which connects a drive shaft driven by a drive motor with an output shaft. The output shaft is mounted in a conventional manner at its output end and at its drive end end by suitable bearings, wherein the drive end end additionally extends through a recess in the planet carrier inside. However, in this known device, the problem arises that it can lead to a tilting of the drill spindle in drilling operation.

Um eine vergleichsweise stabile Lagerung der Bohrspindel zu erhalten, ist es daher in diesen Fällen notwendig, die axiale Baulänge zu vergrößern.In order to obtain a comparatively stable bearing of the drill spindle, it is therefore necessary in these cases to increase the axial length.

Es ist daher die Aufgabe der Erfindung, ein Elektrohandwerkzeuggerät bereitzustellen, das ein Verkippen der Abtriebswelle vermeidet und eine geringe axiale Baulänge benötigt.It is therefore the object of the invention to provide an electric hand tool device which avoids tilting of the output shaft and requires a small axial length.

Die Erfindung löst nun diese Aufgabe, indem ein antriebsseitiges Ende der Abtriebswelle mittels des abtriebsseitigen Planetenträgers geführt ist und der abtriebsseitige Planetenträger im Getriebegehäuse radial über ein radiale Kräfte aufnehmendes Lager, das zwischen dem abtriebsseitigen Planetenträger und dem Getriebegehäuse angeordnet ist, gelagert ist.The invention now achieves this object by a drive-side end of the output shaft is guided by means of the output side planet carrier and the output side planet carrier in the transmission housing radially via a radial forces receiving bearing, the is disposed between the output-side planetary carrier and the transmission housing is stored.

Die radiale Lagerung des abtriebsseitigen Planetenträgers kann dabei über ein Wälzlager erfolgen, insbesondere über ein Rollen- oder ein Kugellager. Das Lager kann dabei hinsichtlich seines Innenrings zwischen einer Schulter des abtriebsseitigen Planetenträgers und einer Gehäuseschulter in axialer Richtung geführt sein, wobei der Außenring zwischen der Gehäuseschulter und einem im Gehäuse festgelegten Ring in axialer Richtung gehalten sein kann. Das Lager ist dabei koaxial zum abtriebsseitigen Planetenträger auf dessen Außenumfang angeordnet.The radial mounting of the output-side planetary carrier can take place via a roller bearing, in particular via a roller or a ball bearing. The bearing can be performed with respect to its inner ring between a shoulder of the driven side planet carrier and a housing shoulder in the axial direction, wherein the outer ring between the housing shoulder and a fixed ring in the housing can be held in the axial direction. The bearing is arranged coaxially with the output-side planet carrier on the outer circumference.

Eine derartige Ausgestaltung ist vorteilhaft, da durch die Lagerung der Abtriebswelle an dem Planetenträger das antriebsseitige Ende der Abtriebswelle durch die radiale Lagerung des Planetenträgers mit stabilisiert wird und ebenfalls eine radiale Führung erfährt. Auf diese Weise kann die antriebsseitige Lagerstelle der Abtriebswelle an ihrem äußersten antriebsseitigen Ende ausgestaltet werden. Insbesondere kann die Abtriebswelle gleitend im abtriebsseitigen Planetenträger gelagert sein, der hierbei eine Innenbohrung aufweist, die die Abtriebswelle aufnimmt.Such a configuration is advantageous because the drive-side end of the output shaft is stabilized by the radial bearing of the planet carrier with the storage of the output shaft to the planet carrier and also undergoes a radial guidance. In this way, the drive-side bearing of the output shaft at its be configured outermost drive-side end. In particular, the output shaft may be slidably mounted in the output side planet carrier, which in this case has an inner bore which receives the output shaft.

Dabei kann des Weiteren nach einer ersten besonders bevorzugten Ausführungsform vorgesehen sein, dass ein Klemmgesperre zwischen Antriebswelle und Abtriebswelle vorgesehen ist, zur Blockierung einer Drehübertragung von der Abtriebswelle auf die Antriebswelle. Die Vorsehung eines Klemmgesperres bietet dabei unter anderem Vorteile hinsichtlich der einhändigen Einspannbarkeit von Werkzeugen in ein Werkzeugfutter, das am abtriebsseitigen Ende der Abtriebswelle mit dieser verbunden ist. Hierbei kann es vorgesehen sein, dass der abtriebsseitige Planetenträger Mitnehmerelemente für das Klemmgesperre aufweist. Insbesondere können die Mitnehmerelemente für das Klemmgesperre einstückig an den abtriebsseitigen Planetenträger angeformt werden, insbesondere auf der in axialer Richtung gegenüberliegenden Seite zu den Planeten des abtriebseitigen Planetenträgers. Das Klemmgesperre kann ansonsten in üblicher Form umfassend Klemmkörper, insbesondere zylindrische Klemmrollen sowie entsprechende Klemmflächen ausgebildet sein.It may further be provided according to a first particularly preferred embodiment, that a Klemmgesperre between the drive shaft and output shaft is provided to block a rotation transmission from the output shaft to the drive shaft. The provision of a Klemmgesperres offers advantages including the one-handed clamping of tools in a tool chuck, which is connected to the output side end of the output shaft with this. It may be provided that the output-side planetary carrier has driving elements for the Klemmgesperre. In particular, the driver elements for the Klemmgesperre can be integrally formed on the output side planet carrier, in particular on the opposite side in the axial direction to the planet of the driven side planet carrier. The Klemmgesperre can otherwise be formed in a conventional form comprising clamping body, in particular cylindrical pinch rollers and corresponding clamping surfaces.

Dabei dient das Klemmgesperre dazu, eine Drehübertragung von der Antriebswelle auf die Abtriebswelle zuzulassen und bei einer Drehmomentübertragung von der Abtriebswelle auf die Antriebswelle zu blockieren und so ein Mitdrehen der Antriebswelle zu verhindern, was gegebenenfalls zu einer Beschädigung des Antriebsmotors führen kann.The Klemmgesperre serves to allow a rotation transmission from the drive shaft to the output shaft and to block at a torque transmission from the output shaft to the drive shaft and thus prevent co-rotation of the drive shaft, which may possibly lead to damage to the drive motor.

Sofern der abtriebsseitige Planetenträger zugleich die Mitnehmerelemente des Klemmgesperres auch als Spindel-Lock bezeichnet trägt, bietet hier die erfindungsgemäße Anordnung mit einer radialen Lagerung des Planetenträgers den Vorteil, nicht nur eine radiale Lagerung der Mitnehmerelemente durch die Verzahnung der Planeten zu bieten. Eine radiale Lagerung nur über die Planeten hat zur Folge, dass kein exakter Rundlauf der Mitnehmerelemente gewährleistet werden kann. Es kann dann zu einem Verkanten der Mitnehmerelemente des Klemmgesperres bei bestimmten Drehzahlen kommen, so dass die Mitnehmerelemente abkippen und mit weiteren Elementen des Klemmgesperres, insbesondere den als Zylinderstifte ausgebildeten Klemmrollen verkanten. Durch die erfindungsgemäß vorgesehene radiale Lagerung des abtriebsseitigen Planetenträgers kann eine konstant bleibende Funktion des Klemmgesperres gewährleistet werden und die Gefahr, dass das Klemmgesperre verkantet oder schlägt, kann vermindert werden, da der exakte Rundlauf der Mitnehmerelemente gewährleistet ist.If the output-side planet carrier at the same time also carries the driver elements of the Klemmgesperres referred to as a spindle lock, offers the arrangement according to the invention with a radial bearing of the planet carrier the advantage here not only to provide a radial mounting of the driver elements by the teeth of the planet. A radial bearing only over the planet has the consequence that no precise concentricity of the driver elements can be guaranteed. It can then lead to tilting of the driver elements of the Klemmgesperres at certain speeds, so that the driver elements tilt and tilt with other elements of the Klemmgesperres, in particular designed as a cylindrical pins pinch rollers. By inventively provided radial support of the output side planet carrier a constant function of the Klemmgesperres can be ensured and the risk that the Klemmgesperre cant or hitting, can be reduced because of the exact concentricity of the driver is guaranteed.

Es kann des Weiteren vorgesehen sein, dass das Planetengetriebe insbesondere zwei Schaltstufen aufweist.It can further be provided that the planetary gear in particular has two switching stages.

Ein derartiges Planetengetriebe ist beispielsweise in der DE 10 2006 025 583 beschrieben und bietet einen hohen Schaltkomfort sowie eine lange Lebensdauer, da sich alle Zahnräder bei einer entsprechenden Anordnung ständig in Eingriff befinden, wodurch ein geringer Verschleiß resultiert. Dabei kann insbesondere vorgesehen sein, dass die Hohlräder der beiden Getriebestufen drehfest miteinander verbunden sind und insbesondere als ein Doppelhohlrad ausgebildet werden, wobei das Hohlrad der dem Abtrieb dienenden Getriebestufen einen geringeren Innendurchmesser aufweisen kann als das Hohlrad der anderen Getriebestufe, wobei die Größenverhältnisse abhängig von den gewünschten Übersetzungsverhältnissen zu wählen sind.Such a planetary gear is for example in the DE 10 2006 025 583 described and offers a high level of comfort and a long service life, since all the gears are in a corresponding arrangement constantly in engagement, resulting in low wear results. It can be provided in particular that the ring gears of the two gear stages are rotatably connected to each other and are in particular formed as a Doppelhohlrad, wherein the ring gear of the output serving gear stages may have a smaller inner diameter than the ring gear of the other gear stage, the size ratios depending on the desired gear ratios are to choose.

Es kann dabei vorgesehen sein, dass in einer ersten Schaltstufe (2. Gang) die miteinander verbundenen Hohlräder blockiert werden, so dass sich der Planetenträger der nicht dem Abtrieb dienenden Schaltstufen frei dreht. Die Planetenräder der dem Abtrieb dienenden Planetenstufe treiben den abtriebseitigen Planetenträger an, so dass dieser die Abtriebswelle mit hoher Geschwindigkeit antreibt. Im langsamen Gang (1. Gang) der anderen Schaltstufe wird dagegen der Planetenträger der antriebsseitigen Planetenstufe blockiert und die Hohlräder der beiden Getriebestufen, die drehfest miteinander verbunden sind, können sich drehen. Hierbei wird in dieser Getriebestufe das Hohlrad mit einem den Sonnenrädern entgegengesetzten Drehsinn angetrieben, woraus eine andere Dreh- beziehungsweise Abrollgeschwindigkeit der Planeten der abtriebsseitigen Schaltstufe resultiert und somit eine andere Drehgeschwindigkeit des abtriebseitigen Planetenträgers. Es erfolgt ein langsamerer Antrieb der Abtriebswelle und ein langsamerer Antrieb eines Elektrohandwerkzeuggeräts das hiermit gekoppelt ist.It may be provided that in a first shift stage (2nd gear), the interconnected ring gears are blocked, so that the planetary carrier not the output switching stages turns freely. The planet gears of the output planetary stage drive the output side planet carrier, so that it drives the output shaft at high speed. In the slow gear (1st gear) of the other switching stage, however, the planet carrier of the drive-side planetary stage is blocked and the ring gears of the two gear stages, which are rotatably connected to each other, can rotate. Here, in this gear stage, the ring gear is driven by a sun gear opposite direction of rotation, resulting in a different rotational or Abrollgeschwindigkeit the planet of the output side switching stage results and thus a different rotational speed of the driven side planet carrier. There is a slower drive of the output shaft and a slower drive an electric hand tool device which is hereby coupled.

Es kann dabei insbesondere vorgesehen sein, dass auch die Sonnenräder drehfest miteinander gekoppelt und vorzugsweise einstückig miteinander verbunden sind. Die Sonnenräder können dabei für beide Getriebestufen den gleichen oder einen anderen Außendurchmesser aufweisen.It may be provided in particular that the sun gears are rotatably coupled together and preferably integrally connected to each other. The sun gears can have the same or a different outer diameter for both gear stages.

Darüber hinaus kann als Schaltmittel zum Schalten der Schaltstufen ein Schaltring vorgesehen sein, der axial derart verschieblich ist, dass er zum einen mit dem Planetenträger der antriebsseitigen Getriebestufe und zum anderen mit den miteinander gekoppelten Hohlrädern der beiden Getriebestufen zusammenwirkt. Der Schaltring kann hierzu mit einer Verzahnung oder anderen Eingriffselementen ausgestattet sein, die mit einer Außenverzahnung oder korrespondierenden Eingriffselementen sowohl des Planetenträgers der antriebsseitigen Getriebestufe als auch der Hohlräder der Getriebestufen zusammenwirken kann, die allesamt den gleichen Außendurchmesser aufweisen. Der Schaltring ist zugleich drehfest im Gehäuse festgelegt ist, beispielsweise über eine Rippe, die in eine Nut eingreift.In addition, can be provided as a switching means for switching the switching stages, a switching ring which is axially displaceable so that it cooperates on the one hand with the planet carrier of the drive-side gear stage and on the other with the mutually coupled ring gears of the two gear stages. The switching ring can be equipped for this purpose with a toothing or other engagement elements, which can cooperate with an external toothing or corresponding engagement elements of both the planet carrier of the drive-side gear stage and the ring gears of the gear stages, all of which have the same outer diameter. The switching ring is at the same time rotatably fixed in the housing, for example via a rib which engages in a groove.

Der Schaltring kann dabei mit einer durch den Benutzer des Elektrohandwerkzeuggerätes zu bedienenden Schalthandhabe verbunden sein, die beispielsweise beim Schalten eine Drehbewegung vollführt, die in die Verschiebebewegung des Schaltrings überführt wird.The switching ring can be connected to a by the user of the electric hand tool device to be operated switching handle, which performs a rotational movement, for example, when switching, which is transferred into the sliding movement of the switching ring.

Der Außenumfang des abtriebsseitigen Planetenträgers weist im Gegensatz zum Außenumfang des antriebsseitigen Planetenträgers keine Verzahnung oder Eingriffselemente auf.The outer circumference of the output-side planetary carrier, in contrast to the outer periphery of the drive-side planetary carrier on no teeth or engagement elements.

Des Weiteren kann vorgesehen sein, dass das antriebsseitige Ende der Abtriebswelle im abtriebseitigen Planetenträger gleitend gelagert ist, also dort lediglich eine radiale Führung erfährt.Furthermore, it can be provided that the drive-side end of the output shaft is slidably mounted in the output-side planet carrier, so there only experiences a radial guidance.

Schließlich kann vorgesehen sein, dass das abtriebseitige Ende der Abtriebswelle über ein axiale und radiale Kräfte aufnehmendes Lager, insbesondere ein Wälzlager, das als Kugel- oder Rollenlager ausgebildet sein kann, gelagert ist. Es kann so erreicht werden, dass die Lagerstellen der Abtriebswelle möglichst weit voneinander entfernt sind, und so eine möglichst kippfreie Lagerung der Abtriebswelle erfolgen kann. Auf diese Weise kann bei gleichzeitig stabiler Lagerung der axiale Bauraum des Elektrohandwerkzeuggerätes gering gehalten werden, was insbesondere bei Bohrschraubern, aber auch bei Bohrmaschinen und Schraubern erwünscht ist.Finally, it can be provided that the output end of the output shaft via a bearing axial and radial forces bearing, in particular a rolling bearing, which may be formed as a ball or roller bearings, is mounted. It can be achieved so that the bearings of the output shaft are as far away from each other, and as possible a tilt-free storage of the output shaft can be done. In this way, the axial space of the electric hand tool device can be kept low with stable storage at the same time, which is particularly desirable in drills, but also in drills and screwdrivers.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den übrigen Anmeldungsunterlagen.Further advantages and features of the invention will become apparent from the remaining application documents.

Die Erfindung wird im Folgenden anhand einer Zeichnung näher erläutert. Dabei zeigt die einzige Figur einen Längsschnitt durch ein Getriebegehäuse eines Elektrohandwerkzeuggerätes, insbesondere eines Akkuschraubers, wobei dieses mit einem weiteren Gehäuse, beispielsweise zur Aufnahme eines Elektromotors (nicht dargestellt) verbunden sein kann. Das weitere Gehäuse kann dabei auch einen Griff zum Führen des Elektrohandwerkzeuggeräts umfassen. Das Getriebegehäuse ist mit dem Bezugszeichen 12 versehen. In dem Getriebegehäuse 12 ist ein Planetengetriebe 14 angeordnet umfassend ein Doppelhohlrad 16 für die beiden Getriebestufen, wobei dem Doppelhohlrad 16 Planeten 18 der antriebsseitigen Getriebestufe sowie Planeten 20 der abtriebsseitigen Planetenstufe zugeordnet sind und in diesem abrollen. Die antriebsseitigen Planeten 18 sind mit einem antriebsseitigen Planetenträger 22 verbunden, der die Planeten 18 trägt. Die Befestigung der Planeten 18 am Planetenträger 22 erfolgt über Bolzen 28. Die Planeten 20 der abtriebsseitigen Getriebestufe sind mit einem abtriebsseitigen Planetenträger 24 verbunden und werden von diesem ebenfalls über Bolzen 26 getragen. Das Sonnenrad ist hier mit dem Bezugszeichen 30 versehen und ist drehfest mit der Antriebswelle 32 verbunden.The invention will be explained in more detail below with reference to a drawing. The single figure shows a longitudinal section through a gear housing of an electric hand tool device, in particular a cordless screwdriver, which may be connected to a further housing, for example for receiving an electric motor (not shown). The further housing may also include a handle for guiding the electric hand tool device. The transmission housing is provided with the reference numeral 12. In the gear housing 12, a planetary gear 14 is arranged comprising a Doppelhohlrad 16 for the two gear stages, the Doppelhohlrad 16 planets 18 of the drive-side gear stage and planet 20 of the output-side planetary gear are associated and roll in this. The drive-side planet 18 are connected to a drive-side planet carrier 22, which carries the planet 18. The attachment of the planet 18 on the planet carrier 22 via pin 28. The planet 20 of the output-side gear stage are connected to a driven side planet carrier 24 and are also supported by this bolt 26. The sun gear is here provided with the reference numeral 30 and is rotatably connected to the drive shaft 32.

Die Antriebswelle 32 ist dabei an ihrem in der Darstellung rechten Ende mit einem Motor (nicht dargestellt), insbesondere einem Elektromotor des Elektrohandwerkzeuggeräts gekoppelt.The drive shaft 32 is at its right end in the illustration with a motor (not shown), in particular an electric motor of the electric hand tool device coupled.

Das Planetengetriebe 14 umfasst darüber hinaus einen Schaltring 34, der in Pfeilrichtung 36 axial verschieblich ist, wobei er in der gezeigten Darstellung den Planetenträger 22 der antriebsseitigen Schaltstufe blockiert, indem der Schaltring 34 mit der Außenverzahnung des antriebsseitigen Planetenträgers 22 in Eingriff steht und fest im Getriebegehäuse 22 beispielsweise mittels einer Rippe, die in eine Nut eingreift, festgelegt ist. Zum Betätigen und axialen Verschieben des Schaltrings 34 in Pfeilrichtung 36 ist eine Schalthandhabe 38 vorgesehen, die als Drehknopf ausgebildet ist und so eine Drehbewegung in eine Verschiebebewegung des Schaltrings 34 übersetzt. In der dargestellten Abbildung befindet sich das entsprechende Elektrohandwerkzeuggerät mit zwei Schaltstufen im langsamen Gang, wobei durch Verschieben des Schaltrings 34 in den Bereich des Hohlrads 16 und damit Blockierung des Hohlrads 16 gegen eine Drehbewegung ein Umschalten in einen schnellen Gang erfolgt.The planetary gear 14 also includes a switching ring 34 which is axially displaceable in the direction of arrow 36, wherein it blocks the planet carrier 22 of the drive-side switching stage in the illustration shown by the switching ring 34 with the external teeth of the drive-side planetary carrier 22 is engaged and fixed in the transmission housing 22, for example, by means of a rib which engages in a groove is fixed. For actuating and axial displacement of the switching ring 34 in the direction of arrow 36, a switching handle 38 is provided, which is designed as a rotary knob and thus a rotational movement in a sliding movement of the Schaltrings 34 translated. In the illustrated figure, the corresponding electric hand tool device with two switching stages is in slow gear, which is done by moving the switching ring 34 in the region of the ring gear 16 and thus blocking the ring gear 16 against rotation in a fast transition.

Der abtriebsseitige Planetenträger 24 trägt des Weiteren Mitnehmerelemente 40 eines Klemmgesperres 42, das so ausgebildet ist, dass eine Drehübertragung von der Antriebswelle 32 auf eine Abtriebswelle 44 ermöglicht ist, jedoch eine Drehübertragung von der Abtriebswelle 44 auf die Antriebswelle 32 durch das Klemmgesperre 42 blockiert ist. Hierzu umfasst das Klemmgesperre zylindrische Rollen 46 als Klemmrollen, die im Klemmfall zwischen dem Getriebegehäuse 12 und einem inneren Klemmherz 50 geklemmt werden und so die Drehmomentübertragung blockieren. Im Antriebsfall erfolgt über das Klemmgesperre 42 der Antrieb der Abtriebswelle 44.The driven-side planetary carrier 24 further carries driving elements 40 of a Klemmgesperres 42 which is formed so that a rotation transmission from the drive shaft 32 to an output shaft 44 is possible, however, a rotation transmission from the output shaft 44 is blocked on the drive shaft 32 by the Klemmgesperre 42. For this purpose, the Klemmgesperre cylindrical rollers 46 as clamping rollers which are clamped in the case of clamping between the gear housing 12 and an inner clamping heart 50 and thus block the torque transmission. In the drive case via the Klemmgesperre 42 of the drive of the output shaft 44th

Um zu verhindern, dass es bei gewissen Drehzahlen zu einem Verkanten der Mitnehmerelemente 40 kommt und um eine sichere radiale Lagerung der Abtriebswelle 44 bereitzustellen, ist nun vorgesehen, den abtriebsseitigen Planetenträger 24 mittels eines Wälzlagers 52 radial zu lagern. Das Wälzlager 52 ist hierbei zwischen dem Getriebegehäuse 12 und dem abtriebsseitigen Planetenträger 24 angeordnet und dient so zur radialen Stabilisierung, die ansonsten lediglich über die Planeten 20 erfolgen würde, die dadurch einem größeren Verschleiß unterliegen würden.In order to prevent that there is a tilting of the driver elements 40 at certain rotational speeds and to provide a secure radial bearing of the output shaft 44, it is now provided to radially support the driven-side planet carrier 24 by means of a roller bearing 52. The roller bearing 52 is in this case arranged between the gear housing 12 and the output-side planetary carrier 24 and thus serves for radial stabilization, which would otherwise only take place via the planets 20, which would thus be subject to greater wear.

Die Lagerung des antriebsseitigen Endes 58 der Abtriebswelle 44 erfolgt dabei gleitend im abtriebsseitigen Planetenträger 24, der hierzu eine Innenbohrung aufweist, die die Abtriebswelle 44 aufnimmt. Des Weiteren ist vorgesehen, das abtriebsseitige Ende 54 der Abtriebswelle 44 mittels eines Wälzlagers 56, das sowohl Axial- als auch Radialkräfte aufzunehmen vermag, zu lagern. Auf diese Weise kann erreicht werden, dass trotz kurzer Baulänge der Abtriebswelle 44 die Lagerstellen auf der Abtriebswelle 44 möglichst weit voneinander entfernt angeordnet sind, um so eine stabile Lagerung der Abtriebswelle bereitzustellen und ein Verkanten derselben zu verhindern, was bei einem vorgesehenen Klemmgesperre 42 zu einem Schlagen des Klemmgesperres führen kann. Durch die Lagerung des abtriebsseitigen Planetenträgers 24 kann der Rundlauf des Planetenträgers besser sichergestellt werden kann, unabhängig von der Einsatzsituation.The bearing of the drive-side end 58 of the output shaft 44 takes place slidably in the output-side planet carrier 24, which for this purpose has an inner bore which receives the output shaft 44. Furthermore, it is provided that the output-side end 54 of the output shaft 44 by means of a roller bearing 56, both axial and radial forces to take up, to store. In this way it can be achieved that, despite the short length of the output shaft 44, the bearings on the output shaft 44 are arranged as far apart as possible, so as to provide a stable mounting of the output shaft and prevent tilting the same, resulting in a designated Klemmgesperre 42 to a Hitting the Klemmgesperres can lead. Due to the mounting of the output-side planetary carrier 24, the concentricity of the planetary carrier can be better ensured, regardless of the application situation.

Auf die vorstehend beschriebene Weise kann eine vergleichsweise kurz bauende Getriebebaugruppe für ein Elektrohandwerkzeuggerät mit drehendem Abtrieb, insbesondere einem Schrauber, Bohrschrauber oder Bohrer bereitgestellt werden.In the manner described above, a comparatively short construction gear assembly for a power tool with rotating output, in particular a screwdriver, drill or drill can be provided.

Claims (8)

  1. Electrical hand tool device, in particular a drilling screwdriver, comprising a gear case (12) as well as an input shaft (32), which is driven by a drive motor and connected by shiftable planetary gearing (14) to an output shaft (44), wherein the planetary gearing (14) comprises an output-side planet carrier (24), characterized in that an input-side end (58) of the output shaft (44) is guided by means of the output-side planet carrier (24) and the output-side planet carrier (24) is supported in the gear case (12) radially via a bearing, which takes up radial forces and is disposed between the output-side planet carrier (24) and the gear case (12).
  2. Electrical hand tool device according to claim 1, characterised in that between input shaft (32) and output shaft (44) a clamp-type locking mechanism (42), which is in particular mounted downstream of the planetary gearing (14), is provided for blocking a rotary transmission from the output shaft (44) to the input shaft (32).
  3. Electrical hand tool device according to claim 2, characterized in that the output-side planet carrier (24) comprises driver elements (40) for the clamp-type locking mechanism (42), which are in particular integrally connected to the output-side planet carrier (24).
  4. Electrical hand tool device according to one of the preceding claims, characterized in that the planetary gearing (14) has two shift stages.
  5. Electrical hand tool device according to claim 4, characterized in that the ring gears (16) of the shift stages are integrally connected to one another.
  6. Electrical hand tool device according to one of the preceding claims, characterized in that the input-side end (58) of the output shaft (44) is slidingly supported in the output-side planet carrier (24).
  7. Electrical hand tool device according to one of the preceding claims, characterized in that for radially supporting the output-side planet carrier (24) a rolling-contact bearing (52) is provided, which is disposed between the output-side planet carrier (24) and the gear case (12).
  8. Electrical hand tool device according to one of the preceding claims, characterized in that the output-side end (54) of the output shaft (44) is supported by means of a bearing (56) that takes up axial and radial forces, in particular a rolling-contact bearing, wherein the bearing (56) is disposed between output shaft (44) and gear case (12).
EP07801768A 2007-08-20 2007-08-20 Electric handheld power tool Active EP2180979B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/007328 WO2009024165A1 (en) 2007-08-20 2007-08-20 Electric handheld power tool

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EP2180979A1 EP2180979A1 (en) 2010-05-05
EP2180979B1 true EP2180979B1 (en) 2011-06-08

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DE202008017689U1 (en) 2008-02-26 2010-03-25 Metabowerke Gmbh Planetary gear for an electric hand tool and electric hand tool
DE102008042423A1 (en) 2008-09-29 2010-04-01 Robert Bosch Gmbh Hand tool with a spindle for holding a tool
US9233461B2 (en) 2012-02-27 2016-01-12 Black & Decker Inc. Tool having multi-speed compound planetary transmission

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DE3525208A1 (en) * 1984-07-16 1986-01-23 Japan Strage Battery Co. Ltd., Kyoto REDUCTION GEARBOX
JP3291609B2 (en) * 1996-02-13 2002-06-10 株式会社マキタ Power tool clutch mechanism
JP2005249110A (en) * 2004-03-05 2005-09-15 Daijiro Nakamura Rotation output device
JP4405900B2 (en) * 2004-03-10 2010-01-27 株式会社マキタ Impact driver

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WO2009024165A1 (en) 2009-02-26
ATE511959T1 (en) 2011-06-15

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