EP2097225B1 - Hand-held power tool - Google Patents

Hand-held power tool Download PDF

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Publication number
EP2097225B1
EP2097225B1 EP07821384.0A EP07821384A EP2097225B1 EP 2097225 B1 EP2097225 B1 EP 2097225B1 EP 07821384 A EP07821384 A EP 07821384A EP 2097225 B1 EP2097225 B1 EP 2097225B1
Authority
EP
European Patent Office
Prior art keywords
sliding means
coupling element
power tool
sliding
intermediate shaft
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.)
Active
Application number
EP07821384.0A
Other languages
German (de)
French (fr)
Other versions
EP2097225A1 (en
Inventor
Andre Ullrich
Helmut Heinzelmann
Juergen Lennartz
Michael Weiss
Tobias Herr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2097225A1 publication Critical patent/EP2097225A1/en
Application granted granted Critical
Publication of EP2097225B1 publication Critical patent/EP2097225B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/061—Swash-plate actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0038—Tools having a rotation-only mode

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1 and as from EP 1 101 570 A known.
  • the invention relates to a hand tool, in particular a hammer drill, according to claim 1 with a beating and a rotating drive and a switching device having a sliding means, which is provided for switching between different modes, and with a main driven means.
  • the sliding means has at least one coupling element which, in at least one operating mode, couples directly to a coupling element which is non-rotatably connected to the main driven means.
  • additional coupling elements such as particular additional gears which are rotatably mounted on an intermediate shaft and a drive torque from the sliding means on the rotationally fixed with the Main driven means connected coupling element transfer.
  • a "main driven means” is to be understood as an output means which extends in particular coaxially to a tool axis of a tool holder and is arranged within the impact mechanism arrangement and / or transmits a drive torque directly to the tool holder, in particular a hammer tube.
  • the coupling element of the main driven means is formed by a gear.
  • a “switching between different operating modes” is intended, in particular, to switch between a beating or a beating-rotating drive, a beating-rotating drive and a rotating drive, between a beating and a rotating drive, or between a beating, a rotating or a hitting-rotating drive for a tool located in the power tool can be understood.
  • a “rotationally fixed connection” is to be understood here in particular as meaning a connection between two components or elements, via which the two components or elements move together in rotation in the same direction of rotation of one of the two components or elements.
  • the hand tool machine is formed by a hammer drill, which has a pure bit drive, a pure drill drive and a combined drill chisel drive for driven by the power tool tool.
  • the sliding means is formed by a sliding sleeve, whereby a particularly compact design of the sliding means, in particular in an arrangement about an intermediate shaft, can be achieved.
  • the sliding sleeve is expediently arranged rotationally on an intermediate shaft, which is rotationally connected to a drive unit or a drive shaft of the drive unit in an operation of the power tool, so that advantageously a drive torque is transmitted from the drive unit via the intermediate shaft to the sliding sleeve.
  • the sliding means be provided in an operating mode for a simultaneous transmission of a drive torque to a main drive means and a percussion mechanism arrangement and so structurally simple, a compact switching device can be achieved.
  • the pusher preferably has a length along an axial direction which allows simultaneous engagement of components of the percussion mechanism assembly and the gear unit coupled to the pusher means in at least one operative position.
  • a structurally simple transmission of a drive torque, preferably a torque, with the sliding means can be advantageously achieved when the coupling element is formed as a toothing.
  • the coupling element is integrally formed on the sliding means, which advantageously further components, space, installation costs and costs can be saved.
  • an "axial direction” should be understood to mean, in particular, a direction along an axis, wherein the axis is aligned perpendicular to a base surface of the sliding means.
  • an "end of the sliding means” is to be understood in particular to mean an end region of the sliding means which is arranged in the region of an edge, in particular a terminal edge of the sliding means.
  • a particularly compact switching device and a stable arrangement of the sliding means can advantageously be achieved if the handheld power tool comprises an intermediate shaft on which a partial region of the sliding means, which has the coupling element, is arranged directly.
  • the sliding means is arranged displaceably in the axial direction on an intermediate shaft, so that the sliding means can be brought into different switching positions or operating positions during operation of the hand tool or the switching device by shifting on the intermediate shaft.
  • the sliding means or transmit coupling elements of the sliding means transmits a drive torque to the main driven means in the operation of the power tool depending on the position on the intermediate shaft and / or on a striking mechanism arrangement or on the coupling elements of the sliding means corresponding components of the main driven means and / or the impact mechanism arrangement.
  • FIGS. 1 to 3 is a detail of an inventive, formed by a rotary hammer hand tool 10 with a switching device 12 is shown.
  • the handheld power tool 10 includes a non-illustrated, formed by an electric motor drive unit which generates a drive torque during operation of the power tool 10 and transmits this via a drive shaft 36 to an intermediate shaft 32.
  • the drive torque is transmitted during operation of the power tool 10 of the intermediate shaft 32 via a sliding means 14 on a percussion device 34 and a formed by a hammer tube main output means 18, thereby generating a rotating, a beating or a hitting-rotating drive for a in a tool holder
  • a transmission of the drive torque to the main output means 18 this rotates about a tool axis 40 and thus generates a rotating drive in the FIGS. 1 to 3 not shown tool holder, in which the tool 38 is arranged rotationally fixed.
  • the percussion arrangement 34 When transmitting a drive torque the percussion arrangement 34 generates this a percussion impulse, which is transmitted via an unillustrated racket to an anvil and finally to the tool 38 ( FIGS. 1 to 3 ).
  • the switching device 12 comprises the intermediate shaft 32 and the sliding means 14 formed by a sliding sleeve, which is provided for switching between different types of drive of the power tool.
  • the intermediate shaft 32 is rotatably mounted in an axial direction 30, which is parallel to the tool axis 40, on an end 42 facing a drive side and on an output side facing end 44 of the intermediate shaft 32 via two pivot bearings 46, 48 on a hand tool housing 50.
  • the drive shaft 36 has a toothing, not shown, which engages positively in a toothing corresponding to the gear 52.
  • the gear wheel 52 is non-rotatably mounted on the intermediate shaft 32, so that the intermediate shaft 32 is always rotationally connected to the drive unit during operation of the power tool 10 and a drive torque is transmitted from the drive unit via the gear 52 to the intermediate shaft 32 via the intermediate shaft 32 ( FIGS. 1 to 3 ).
  • the sliding means 14 is arranged rotationally fixed on the intermediate shaft 32, which has a driving toothing 54 for this purpose.
  • the entrainment toothing 54 is connected in a rotationally fixed manner in the circumferential direction 24 of the intermediate shaft 32 in a part region 56 of the intermediate shaft 32 arranged centrally in the axial direction 30.
  • this On a radially outwardly directed side of the driving teeth 54, this has a toothing, in which a Mit Cyprusver leopardung 54 corresponding internal teeth 58 of the sliding means 14 engages positively, wherein the internal toothing 58 on a radially inwardly facing cylinder jacket surface 60 (FIGS. Figures 1 and 2 ) is arranged in the circumferential direction 24 of the sliding means 14.
  • the internal toothing 58 of the sliding means 14 has a greater length 62 in the axial direction 30 than a length 64 of the driving toothing 54 (FIG. FIG. 1 ), so that the sliding means 14 in the axial direction 30 of the intermediate shaft 32 can be moved by an operator of the power tool 10 for switching to different types of drive of the power tool 10.
  • the sliding means 14 is always independent of different switching positions along the intermediate shaft 32 rotationally connected thereto via the driving teeth 54 and the internal teeth 58 of the sliding means 14.
  • the internal toothing 58 extends from a drive-side end 66 of the sliding means 14 in the direction of the tool 38 to approximately two thirds in the axial direction 30 of the sliding means 14 into this.
  • the sliding means 14 has an inwardly directed side on a stepped shape, wherein a portion 68, which includes the internal teeth 58, a larger inner cross-sectional area than a tool 38 facing portion 70 of the sliding means 14.
  • the portion 70 of the sliding means 14 with the smaller cross-sectional area is arranged directly on the intermediate shaft 32 ( FIGS. 1 to 3 ).
  • the pushing means 14 has different switching positions ( FIGS. 1 to 3 ).
  • a First shift position in which the switching device 12 and the pushing means 14 switches into a pure drilling drive of the power tool 10
  • the sliding means 14 is brought via a not shown in detail and operable by an operator actuator in a front, output side position ( FIG. 1 ).
  • the sliding means 14 transmits a drive torque exclusively to the main driven means 18 or to a coupling element 16 of the main driven means 18, so that the main driven means 18 performs a rotating movement or the main driven means 18 puts the tool 38 located in the tool holder in a pure drilling operation.
  • the coupling element 16 is non-rotatably connected to the main driven means 18.
  • the sliding means 14 For transmitting a rotary drive to the coupling element 16 of the main output means 18 formed by a gear, the sliding means 14 comprises a coupling element 20 in the portion 70 located at a driven end 28 and directly around the intermediate shaft 32 a toothing corresponding to the coupling element 16 of the main driven means 18 is formed on a radially outwardly directed surface 22, the sliding means 14 integrally formed on the sliding means 14.
  • the toothing of the coupling element 20 comprises in the axial direction 30 a length 72 of the coupling element 16 of the main driven means 18, so that in a pure drill drive for the tool located in the tool holder 38 maximum engagement between the coupling element 20 of the sliding means 14 and the coupling element 16 of the main driven means 18th is reached ( FIG. 1 ).
  • a stop means 74 is arranged between the coupling element 20 of the sliding means 14 and the adjoining the coupling element 20 in the axial direction 30, radially outwardly directed surface 22 of the sliding means 14, a stop means 74 is arranged.
  • the stop means 74 is formed as a shoulder between an inner radius of the coupling element 20 of the sliding means 14 and the radially outwardly directed surface 22 of the sliding means 14 which adjoins the coupling element 20.
  • the pushing means 14 simultaneously transmits a driving torque to the coupling element 16 of the main driven means 18 and to the striking mechanism arrangement 34 or to a coupling element 76 of the striking mechanism arrangement 34 (FIG. FIG. 2 ).
  • the pushing means 14 is pushed into an intermediate switching position along the axial direction 30 of the intermediate shaft 32, in which the coupling element 20 of the sliding means 14 is still in engagement with the coupling element 16 of the main driven means 18 and the internal teeth 58 of the sliding means 14 at the drive end 66 in the coupling element 76 of the striking mechanism arrangement 34 engages.
  • the hand tool 10 thus simultaneously performs a drilling and chisel movement for a tool 38.
  • the percussion arrangement 34 comprises a Tumble finger 78, which is mounted on a ball bearing 80 on a wobble sleeve 82.
  • the wobble sleeve 82 is freely rotatable about a bearing 84, which is formed by a needle bearing, at which the drive unit facing end 42 of the intermediate shaft 32 mounted thereon.
  • the wobble sleeve 82 is arranged immovably in the axial direction 30 about the intermediate shaft 32.
  • this has the coupling element 76, which is formed by a toothing corresponding to the internal teeth 58 of the sliding means 14 and integrally formed on the wobble sleeve 82 ( FIG. 1 ). Via the internal teeth 58 of the sliding means 14, the torque is transmitted to the coupling element 76 and thus to the wobble sleeve 82, and thus the percussion mechanism assembly 34 is driven.
  • this exclusively transmits a drive torque to the impact mechanism arrangement 34 (FIG. FIG. 3 ).
  • the sliding means 14 is in a drive-side end position on the intermediate shaft 32, wherein the internal teeth 58 of the sliding means 14 in the axial direction 30 engages completely in the coupling element 76 of the wobble sleeve 82.
  • the coupling element 20 of the pusher 14 and the coupling element 16 of the main driven means 18 are in a decoupled position relative to each other, so that the hand tool 10 is in an exclusive chiseling operation.

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

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1 und wie aus der EP 1 101 570 A bekannt.The invention relates to a hand tool according to the preamble of claim 1 and as from EP 1 101 570 A known.

Aus der EP 1 157 788 A2 ist bereits eine Handwerkzeugmaschine mit einem Hauptabtriebsmittel und einem schlagenden und einem drehenden Antrieb bekannt. Zum Schalten zwischen einem schlagenden, einem drehenden und einem schlagend-drehenden Antrieb weist die Handwerkzeugmaschine eine Schaltvorrichtung mit einem Schiebemittel auf.From the EP 1 157 788 A2 already a hand tool with a main driven means and a beating and a rotating drive is known. For switching between a beating, a rotating and a hitting-rotating drive, the power tool on a switching device with a sliding means.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung geht aus von einer Handwerkzeugmaschine, insbesondere von einem Bohrhammer, gemäß dem Anspruch 1 mit einem schlagenden und einem drehenden Antrieb und einer Schaltvorrichtung, die ein Schiebemittel aufweist, das zu einem Schalten zwischen unterschiedlichen Betriebsarten vorgesehen ist, und mit einem Hauptabtriebsmittel.The invention relates to a hand tool, in particular a hammer drill, according to claim 1 with a beating and a rotating drive and a switching device having a sliding means, which is provided for switching between different modes, and with a main driven means.

Es wird vorgeschlagen, dass das Schiebemittel wenigstens ein Kopplungselement aufweist, das in wenigstens einer Betriebsart direkt mit einem Kopplungselement koppelt, das drehfest mit dem Hauptabtriebsmittel verbunden ist. Hierdurch kann eine kompakte Schaltvorrichtung erzielt werden, mit der zudem weitere Bauteile, Bauraum, Montageaufwand und Kosten eingespart werden können, beispielsweise zusätzliche Kopplungselemente, wie insbesondere zusätzliche Zahnräder, die drehbar auf einer Zwischenwelle gelagert sind und ein Antriebsmoment von dem Schiebemittel auf das drehfest mit dem Hauptabtriebsmittel verbundene Kopplungselement übertragen. In diesem Zusammenhang soll unter einem "Hauptabtriebsmittel" ein Abtriebsmittel verstanden werden, das sich insbesondere koaxial zu einer Werkzeugachse einer Werkzeugaufnahme erstreckt und innerhalb der Schlagwerksanordnung angeordnet ist und/oder ein Antriebsmoment direkt auf die Werkzeugaufnahme überträgt, wie insbesondere ein Hammerrohr. Vorzugsweise ist das Kopplungselement des Hauptabtriebsmittels von einem Zahnrad gebildet. Unter einem "Schalten zwischen unterschiedlichen Betriebsarten" soll in diesem Zusammenhang insbesondere ein Schalten zwischen einem schlagenden oder einem schlagend-drehenden Antrieb, zwischen einem schlagend-drehenden und einem drehenden Antrieb, zwischen einem schlagenden und einem drehenden Antrieb oder zwischen einem schlagenden, einem drehenden oder einem schlagend-drehenden Antrieb für ein in der Handwerkzeugmaschine befindliches Werkzeug verstanden werden. Unter einer "drehfesten Verbindung" soll hierbei insbesondere eine Verbindung zwischen zwei Bauteilen oder Elementen verstanden werden, über die sich bei Rotation von einem der beiden Bauteile oder Elemente die beiden Bauteile oder Elemente zusammen in eine gleiche Rotationsrichtung bewegen. Insbesondere ist die Handwerkzeugmaschine von einem Bohrhammer gebildet, der über einen reinen Meißelantrieb, einen reinen Bohrantrieb und einen kombinierten Bohr-Meißelantrieb für ein von der Handwerkzeugmaschine angetriebenes Werkzeug verfügt.It is proposed that the sliding means has at least one coupling element which, in at least one operating mode, couples directly to a coupling element which is non-rotatably connected to the main driven means. In this way, a compact switching device can be achieved with the other components, space, installation costs and costs can be saved, for example, additional coupling elements, such as particular additional gears which are rotatably mounted on an intermediate shaft and a drive torque from the sliding means on the rotationally fixed with the Main driven means connected coupling element transfer. In this context, a "main driven means" is to be understood as an output means which extends in particular coaxially to a tool axis of a tool holder and is arranged within the impact mechanism arrangement and / or transmits a drive torque directly to the tool holder, in particular a hammer tube. Preferably, the coupling element of the main driven means is formed by a gear. In this context, a "switching between different operating modes" is intended, in particular, to switch between a beating or a beating-rotating drive, a beating-rotating drive and a rotating drive, between a beating and a rotating drive, or between a beating, a rotating or a hitting-rotating drive for a tool located in the power tool can be understood. A "rotationally fixed connection" is to be understood here in particular as meaning a connection between two components or elements, via which the two components or elements move together in rotation in the same direction of rotation of one of the two components or elements. Especially the hand tool machine is formed by a hammer drill, which has a pure bit drive, a pure drill drive and a combined drill chisel drive for driven by the power tool tool.

Des Weiteren wird vorgeschlagen dass das Schiebemittel von einer Schiebehülse gebildet ist, wodurch eine besonders kompakte Bauweise des Schiebemittels, insbesondere bei einer Anordnung um eine Zwischenwelle, erreicht werden kann. Die Schiebehülse ist zweckmäßigerweise verdrehfest auf einer Zwischenwelle, die in einem Betrieb der Handwerkzeugmaschine drehend mit einer Antriebseinheit bzw. einer Antriebswelle der Antriebseinheit verbunden ist, angeordnet, so dass dabei vorteilhaft ein Antriebsmoment von der Antriebseinheit über die Zwischenwelle auf die Schiebehülse übertragen wird.Furthermore, it is proposed that the sliding means is formed by a sliding sleeve, whereby a particularly compact design of the sliding means, in particular in an arrangement about an intermediate shaft, can be achieved. The sliding sleeve is expediently arranged rotationally on an intermediate shaft, which is rotationally connected to a drive unit or a drive shaft of the drive unit in an operation of the power tool, so that advantageously a drive torque is transmitted from the drive unit via the intermediate shaft to the sliding sleeve.

Des Weiteren wird vorgeschlagen, dass das Schiebemittel in einer Betriebsart zu einer gleichzeitigen Übertragung eines Antriebsmoments auf ein Hauptabtriebsmittel und auf eine Schlagwerksanordnung vorgesehen ist und so konstruktiv einfach eine kompakte Schaltvorrichtung erreicht werden kann. Das Schiebemittel weist vorzugsweise eine Länge entlang einer Axialrichtung auf, die ein gleichzeitiges Eingreifen von an das Schiebemittel koppelnden Bauteilen der Schlagwerksanordnung und der Zahnradeinheit in zumindest einer Betriebsposition ermöglicht.Furthermore, it is proposed that the sliding means be provided in an operating mode for a simultaneous transmission of a drive torque to a main drive means and a percussion mechanism arrangement and so structurally simple, a compact switching device can be achieved. The pusher preferably has a length along an axial direction which allows simultaneous engagement of components of the percussion mechanism assembly and the gear unit coupled to the pusher means in at least one operative position.

Eine konstruktiv einfache Übertragung eines Antriebsmoments, vorzugsweise eines Drehmoments, mit dem Schiebemittel kann vorteilhaft erreicht werden, wenn das Kopplungselement als Verzahnung ausgebildet ist.A structurally simple transmission of a drive torque, preferably a torque, with the sliding means can be advantageously achieved when the coupling element is formed as a toothing.

Ferner wird vorzugsweise vorgeschlagen, dass das Kopplungselement an das Schiebemittel angeformt ist, wodurch vorteilhaft weitere Bauteile, Bauraum, Montageaufwand und Kosten eingespart werden können.Further, it is preferably proposed that the coupling element is integrally formed on the sliding means, which advantageously further components, space, installation costs and costs can be saved.

Besonders vorteilhaft können weitere Bauteile, wie beispielsweise zusätzliche, auf der Zwischenwelle gelagerte Zahnräder, wie beispielsweise bei einer radial nach innen gerichteten Anordnung des Kopplungselements, eingespart werden, wenn das Kopplungselement an einer radial nach außen gerichteten Oberfläche des Schiebemittels angeordnet ist.Particularly advantageous additional components, such as additional, mounted on the intermediate shaft gears, such as in a radially inwardly directed arrangement of the coupling element can be saved when the Coupling element is arranged on a radially outwardly directed surface of the sliding means.

Zudem wird vorzugsweise vorgeschlagen, dass das Kopplungselement an einem Ende in eine Axialrichtung des Schiebemittels angeordnet ist, wodurch das Kopplungselement des Schiebemittels vorteilhaft auf einen effektiven Kopplungsbereich mit einer weiteren Einheit beschränkt werden kann. In diesem Zusammenhang soll unter einer "Axialrichtung" insbesondere eine Richtung entlang einer Achse verstanden werden, wobei die Achse senkrecht zu einer Grundfläche des Schiebemittels ausgerichtet ist. Unter einem "Ende des Schiebemittels" soll hierbei insbesondere ein Endbereich des Schiebemittels verstanden werden, der im Bereich einer Kante, insbesondere einer Abschlusskante des Schiebemittels, angeordnet ist.In addition, it is preferably proposed that the coupling element is arranged at one end in an axial direction of the sliding means, whereby the coupling element of the sliding means can be advantageously limited to an effective coupling region with another unit. In this context, an "axial direction" should be understood to mean, in particular, a direction along an axis, wherein the axis is aligned perpendicular to a base surface of the sliding means. In this case, an "end of the sliding means" is to be understood in particular to mean an end region of the sliding means which is arranged in the region of an edge, in particular a terminal edge of the sliding means.

Eine besonders kompakte Schaltvorrichtung und eine stabile Anordnung des Schiebemittels können vorteilhaft erreicht werden, wenn die Handwerkzeugmaschine eine Zwischenwelle umfasst, auf der ein Teilbereich des Schiebemittels, der das Kopplungselement aufweist, direkt angeordnet ist.A particularly compact switching device and a stable arrangement of the sliding means can advantageously be achieved if the handheld power tool comprises an intermediate shaft on which a partial region of the sliding means, which has the coupling element, is arranged directly.

Des Weiteren wird vorzugsweise vorgeschlagen, dass das Schiebemittel in Axialrichtung verschiebbar auf einer Zwischenwelle angeordnet ist, so dass das Schiebemittel im Betrieb der Handwerkzeugmaschine bzw. der Schaltvorrichtung durch ein Verschieben auf der Zwischenwelle in unterschiedliche Schaltpositionen bzw. Betriebspositionen gebracht werden kann. Vorzugsweise überträgt das Schiebemittel bzw. übertragen Kopplungselemente des Schiebemittels im Betrieb der Handwerkzeugmaschine je nach Lage auf der Zwischenwelle ein Antriebsmoment auf das Hauptabtriebsmittel und/oder auf eine Schlagwerksanordnung bzw. auf zu den Kopplungselementen des Schiebemittels korrespondierende Bauteile des Hauptabtriebsmittels und/oder der Schlagwerksanordnung.Furthermore, it is preferably proposed that the sliding means is arranged displaceably in the axial direction on an intermediate shaft, so that the sliding means can be brought into different switching positions or operating positions during operation of the hand tool or the switching device by shifting on the intermediate shaft. Preferably, the sliding means or transmit coupling elements of the sliding means transmits a drive torque to the main driven means in the operation of the power tool depending on the position on the intermediate shaft and / or on a striking mechanism arrangement or on the coupling elements of the sliding means corresponding components of the main driven means and / or the impact mechanism arrangement.

Zeichnungdrawing

Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Es zeigen:

Fig. 1
einen Ausschnitt einer erfindungsgemäßen Handwerkzeugmaschine mit einer Schaltvorrichtung in einem Bohrbetrieb in einer schematischen Schnittdarstellung, Fig. 2 die Handwerkzeugmaschine aus Figur 1 in einem Schlagbohrbetrieb in einer schematischen Schnittdarstellung und
Fig. 3
die Handwerkzeugmaschine aus Figur 1 in einem Meißelbetrieb in einer schematischen Schnittdarstellung.
Show it:
Fig. 1
a detail of a hand tool of the invention with a switching device in a drilling operation in a schematic sectional view, Fig. 2 the hand tool FIG. 1 in a percussion drilling in a schematic sectional view and
Fig. 3
the hand tool FIG. 1 in a chisel operation in a schematic sectional view.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In den Figuren 1 bis 3 ist ein Ausschnitt einer erfindungsgemäßen, von einem Bohrhammer gebildeten Handwerkzeugmaschine 10 mit einer Schaltvorrichtung 12 dargestellt. Die Handwerkzeugmaschine 10 umfasst eine nicht näher dargestellte, von einem Elektromotor gebildete Antriebseinheit, die im Betrieb der Handwerkzeugmaschine 10 ein Antriebsmoment erzeugt und dieses über eine Antriebswelle 36 auf eine Zwischenwelle 32 überträgt. Das Antriebsmoment wird im Betrieb der Handwerkzeugmaschine 10 von der Zwischenwelle 32 über ein Schiebemittel 14 auf eine Schlagwerksanordnung 34 bzw. auf ein von einem Hammerrohr gebildetes Hauptabtriebsmittel 18 übertragen und erzeugt dabei einen drehenden, einen schlagenden oder einen schlagend-drehenden Antrieb für ein in einer Werkzeugaufnahme befindliches Werkzeug 38. Bei einer Übertragung des Antriebsmoments auf das Hauptabtriebsmittel 18 rotiert dieses um eine Werkzeugachse 40 und erzeugt damit einen drehenden Antrieb der in den Figuren 1 bis 3 nicht näher dargestellten Werkzeugaufnahme, in welcher das Werkzeug 38 verdrehfest angeordnet ist. Bei der Übertragung eines Antriebsmoments auf die Schlagwerksanordnung 34 erzeugt diese einen Schlagimpuls, der über einen nicht näher dargestellten Schläger auf einen Döpper und schließlich auf das Werkzeug 38 übertragen wird (Figuren 1 bis 3).In the FIGS. 1 to 3 is a detail of an inventive, formed by a rotary hammer hand tool 10 with a switching device 12 is shown. The handheld power tool 10 includes a non-illustrated, formed by an electric motor drive unit which generates a drive torque during operation of the power tool 10 and transmits this via a drive shaft 36 to an intermediate shaft 32. The drive torque is transmitted during operation of the power tool 10 of the intermediate shaft 32 via a sliding means 14 on a percussion device 34 and a formed by a hammer tube main output means 18, thereby generating a rotating, a beating or a hitting-rotating drive for a in a tool holder When a transmission of the drive torque to the main output means 18, this rotates about a tool axis 40 and thus generates a rotating drive in the FIGS. 1 to 3 not shown tool holder, in which the tool 38 is arranged rotationally fixed. When transmitting a drive torque the percussion arrangement 34 generates this a percussion impulse, which is transmitted via an unillustrated racket to an anvil and finally to the tool 38 ( FIGS. 1 to 3 ).

Die Schaltvorrichtung 12 umfasst die Zwischenwelle 32 und das von einer Schiebehülse gebildete Schiebemittel 14, das zu einem Schalten zwischen unterschiedlichen Antriebsarten der Handwerkzeugmaschine vorgesehen ist. Die Zwischenwelle 32 ist in eine Axialrichtung 30, die parallel zur Werkzeugachse 40 verläuft, an einem einer Antriebsseite zugewandten Ende 42 und an einem einer Abtriebsseite zugewandten Ende 44 der Zwischenwelle 32 drehbar über zwei Drehlager 46, 48 an einem Handwerkzeugmaschinengehäuse 50 gelagert. Die Antriebswelle 36 weist eine nicht näher dargestellte Verzahnung auf, die formschlüssig in ein zur Verzahnung korrespondierendes Zahnrad 52 greift. Das Zahnrad 52 ist drehfest auf der Zwischenwelle 32 angeordnet, so dass die Zwischenwelle 32 im Betrieb der Handwerkzeugmaschine 10 stets drehend mit der Antriebseinheit verbunden ist und über die Zwischenwelle 32 ein Antriebsmoment von der Antriebseinheit über das Zahnrad 52 auf die Zwischenwelle 32 übertragen wird (Figuren 1 bis 3).The switching device 12 comprises the intermediate shaft 32 and the sliding means 14 formed by a sliding sleeve, which is provided for switching between different types of drive of the power tool. The intermediate shaft 32 is rotatably mounted in an axial direction 30, which is parallel to the tool axis 40, on an end 42 facing a drive side and on an output side facing end 44 of the intermediate shaft 32 via two pivot bearings 46, 48 on a hand tool housing 50. The drive shaft 36 has a toothing, not shown, which engages positively in a toothing corresponding to the gear 52. The gear wheel 52 is non-rotatably mounted on the intermediate shaft 32, so that the intermediate shaft 32 is always rotationally connected to the drive unit during operation of the power tool 10 and a drive torque is transmitted from the drive unit via the gear 52 to the intermediate shaft 32 via the intermediate shaft 32 ( FIGS. 1 to 3 ).

Zum Schalten zwischen den unterschiedlichen Antriebsarten ist das Schiebemittel 14 verdrehfest auf der Zwischenwelle 32 angeordnet, die hierzu eine Mitnahmeverzahnung 54 aufweist. Die Mitnahmeverzahnung 54 ist in einem in Axialrichtung 30 mittig angeordneten Teilbereich 56 der Zwischenwelle 32 drehfest in Umfangsrichtung 24 der Zwischenwelle 32 mit dieser verbunden. An einer radial nach außen gerichteten Seite der Mitnahmeverzahnung 54 weist diese eine Verzahnung auf, in die eine zur Mitnahmeverzahnung 54 korrespondierende Innenverzahnung 58 des Schiebemittels 14 formschlüssig greift, wobei die Innenverzahnung 58 an einer radial nach innen weisenden Zylindermantelfläche 60 (Figuren 1 und 2) in Umfangsrichtung 24 des Schiebemittels 14 angeordnet ist. Die Innenverzahnung 58 des Schiebemittels 14 weist dabei in Axialrichtung 30 eine größere Länge 62 auf als eine Länge 64 der Mitnahmeverzahnung 54 (Figur 1), so dass das Schiebemittel 14 in Axialrichtung 30 der Zwischenwelle 32 von einem Bediener der Handwerkzeugmaschine 10 zum Schalten in unterschiedliche Antriebsarten der Handwerkzeugmaschine 10 verschoben werden kann. Das Schiebemittel 14 ist dabei unabhängig von unterschiedlichen Schaltpositionen entlang der Zwischenwelle 32 stets verdrehfest mit dieser über die Mitnahmeverzahnung 54 und die Innenverzahnung 58 des Schiebemittels 14 verbunden.For switching between the different types of drive, the sliding means 14 is arranged rotationally fixed on the intermediate shaft 32, which has a driving toothing 54 for this purpose. The entrainment toothing 54 is connected in a rotationally fixed manner in the circumferential direction 24 of the intermediate shaft 32 in a part region 56 of the intermediate shaft 32 arranged centrally in the axial direction 30. On a radially outwardly directed side of the driving teeth 54, this has a toothing, in which a Mitnahmeverzahnung 54 corresponding internal teeth 58 of the sliding means 14 engages positively, wherein the internal toothing 58 on a radially inwardly facing cylinder jacket surface 60 (FIGS. Figures 1 and 2 ) is arranged in the circumferential direction 24 of the sliding means 14. The internal toothing 58 of the sliding means 14 has a greater length 62 in the axial direction 30 than a length 64 of the driving toothing 54 (FIG. FIG. 1 ), so that the sliding means 14 in the axial direction 30 of the intermediate shaft 32 can be moved by an operator of the power tool 10 for switching to different types of drive of the power tool 10. The sliding means 14 is always independent of different switching positions along the intermediate shaft 32 rotationally connected thereto via the driving teeth 54 and the internal teeth 58 of the sliding means 14.

Die Innenverzahnung 58 erstreckt sich dabei von einem antriebsseitigen Ende 66 des Schiebemittels 14 in Richtung des Werkzeugs 38 zu etwa zwei Drittel in Axialrichtung 30 des Schiebemittels 14 in dieses hinein. Das Schiebemittel 14 weist an einer nach innen gerichteten Seite eine stufenförmige Form auf, wobei ein Teilbereich 68, der die Innenverzahnung 58 umfasst, eine größere innere Querschnittsfläche aufweist als ein dem Werkzeug 38 zugewandter Teilbereich 70 des Schiebemittels 14. Der Teilbereich 70 des Schiebemittels 14 mit der kleineren Querschnittsfläche ist dabei direkt auf der Zwischenwelle 32 angeordnet (Figuren 1 bis 3).The internal toothing 58 extends from a drive-side end 66 of the sliding means 14 in the direction of the tool 38 to approximately two thirds in the axial direction 30 of the sliding means 14 into this. The sliding means 14 has an inwardly directed side on a stepped shape, wherein a portion 68, which includes the internal teeth 58, a larger inner cross-sectional area than a tool 38 facing portion 70 of the sliding means 14. The portion 70 of the sliding means 14 with the smaller cross-sectional area is arranged directly on the intermediate shaft 32 ( FIGS. 1 to 3 ).

Das Schiebemittel 14 nimmt im Betrieb der Handwerkzeugmaschine 10 in Axialrichtung 30 entlang der Zwischenwelle 32 unterschiedliche Schaltpositionen ein (Figuren 1 bis 3). In einer ersten Schaltposition, in der die Schaltvorrichtung 12 bzw. das Schiebemittel 14 in einen reinen Bohrantrieb der Handwerkzeugmaschine 10 schaltet, ist das Schiebemittel 14 über ein nicht näher dargestelltes und für einen Bediener betätigbares Betätigungselement in eine vordere, abtriebsseitige Position gebracht (Figur 1). Dabei überträgt das Schiebemittels 14 ein Antriebsmoment ausschließlich auf das Hauptabtriebsmittel 18 bzw. auf ein Kopplungselement 16 des Hauptabtriebsmittels 18, so dass das Hauptabtriebsmittel 18 eine drehende Bewegung ausführt bzw. das Hauptabtriebsmittel 18 das in der Werkzeugaufnahme befindliche Werkzeug 38 in einen reinen Bohrbetrieb versetzt. Das Kopplungselement 16 ist drehfest mit dem Hauptabtriebsmittel 18 verbunden.During operation of the power tool 10 in the axial direction 30 along the intermediate shaft 32, the pushing means 14 has different switching positions ( FIGS. 1 to 3 ). In a First shift position in which the switching device 12 and the pushing means 14 switches into a pure drilling drive of the power tool 10, the sliding means 14 is brought via a not shown in detail and operable by an operator actuator in a front, output side position ( FIG. 1 ). In this case, the sliding means 14 transmits a drive torque exclusively to the main driven means 18 or to a coupling element 16 of the main driven means 18, so that the main driven means 18 performs a rotating movement or the main driven means 18 puts the tool 38 located in the tool holder in a pure drilling operation. The coupling element 16 is non-rotatably connected to the main driven means 18.

Zur Übertragung eines drehenden Antriebs auf das von einem Zahnrad gebildete Kopplungselement 16 des Hauptabtriebsmittels 18 umfasst das Schiebemittel 14 in dem Teilbereich 70, der an einem abtriebsseitigen Ende 28 und direkt um die Zwischenwelle 32 angeordnet ist, ein Kopplungselement 20. Das Kopplungselement 20, das von einer zum Kopplungselement 16 des Hauptabtriebsmittels 18 korrespondierenden Verzahnung gebildet ist, ist an einer radial nach außen gerichteten Oberfläche 22 das Schiebemittels 14 einstückig an das Schiebemittel 14 angeformt. Die Verzahnung des Kopplungselements 20 umfasst in Axialrichtung 30 eine Länge 72 des Kopplungselements 16 des Hauptabtriebsmittels 18, so dass bei einem reinen Bohrantrieb für das in der Werkzeugaufnahme befindliche Werkzeug 38 ein maximaler Eingriff zwischen dem Kopplungselement 20 des Schiebemittels 14 und dem Kopplungselement 16 des Hauptabtriebsmittels 18 erreicht wird (Figur 1).For transmitting a rotary drive to the coupling element 16 of the main output means 18 formed by a gear, the sliding means 14 comprises a coupling element 20 in the portion 70 located at a driven end 28 and directly around the intermediate shaft 32 a toothing corresponding to the coupling element 16 of the main driven means 18 is formed on a radially outwardly directed surface 22, the sliding means 14 integrally formed on the sliding means 14. The toothing of the coupling element 20 comprises in the axial direction 30 a length 72 of the coupling element 16 of the main driven means 18, so that in a pure drill drive for the tool located in the tool holder 38 maximum engagement between the coupling element 20 of the sliding means 14 and the coupling element 16 of the main driven means 18th is reached ( FIG. 1 ).

Zwischen dem Kopplungselement 20 des Schiebemittels 14 und der sich in Axialrichtung 30 an das Kopplungselement 20 anschließenden, radial nach außen gerichteten Oberfläche 22 des Schiebemittels 14 ist ein Anschlagmittel 74 angeordnet. Das Anschlagmittel 74 ist als ein Absatz zwischen einem Innenradius des Kopplungselements 20 des Schiebemittels 14 und der sich an das Kopplungselement 20 anschließenden, radial nach außen gerichteten Oberfläche 22 des Schiebemittels 14 ausgeformt. Bei einem Verschieben des Schiebemittels 14 in eine Richtung des Werkzeugs 38 wird das Kopplungselement 16 des Hauptabtriebsmittels 18 in Anschlag mit dem Anschlagmittel 74 gebracht, so dass ein weiteres und unerwünschtes Verschieben des Schiebemittels 14 verhindert wird und das Schiebemittel 14 bzw. die Innenverzahnung 58 des Schiebemittels 14 in Wirkverbindung mit der Mitnahmeverzahnung 54 der Zwischenwelle 32 bleibt.Between the coupling element 20 of the sliding means 14 and the adjoining the coupling element 20 in the axial direction 30, radially outwardly directed surface 22 of the sliding means 14, a stop means 74 is arranged. The stop means 74 is formed as a shoulder between an inner radius of the coupling element 20 of the sliding means 14 and the radially outwardly directed surface 22 of the sliding means 14 which adjoins the coupling element 20. Upon displacement of the sliding means 14 in a direction of the tool 38, the coupling element 16 of the main driven means 18 is brought into abutment with the stop means 74, so that further and undesired displacement of the sliding means 14 is prevented and the sliding means 14 or the internal teeth 58 of the sliding means 14 in operative connection with the driving teeth 54 of the intermediate shaft 32 remains.

In einer weiteren Schaltposition des Schiebemittels 14 überträgt das Schiebemittel 14 gleichzeitig ein Antriebsmoment auf das Kopplungselement 16 des Hauptabtriebsmittels 18 und auf die Schlagwerksanordnung 34 bzw. auf ein Kopplungselement 76 der Schlagwerksanordnung 34 (Figur 2). Hierzu ist das Schiebemittel 14 in eine mittlere Schaltposition entlang der Axialrichtung 30 der Zwischenwelle 32 geschoben, in der das Kopplungselement 20 des Schiebemittels 14 noch in Eingriff mit dem Kopplungselement 16 des Hauptabtriebsmittels 18 ist und die Innenverzahnung 58 des Schiebemittels 14 an dem antriebsseitigen Ende 66 in das Kopplungselement 76 der Schlagwerksanordnung 34 greift. Die Handwerkzeugmaschine 10 führt somit gleichzeitig eine Bohr- und Meißelbewegung für ein Werkzeug 38 aus. Die Schlagwerksanordnung 34 umfasst einen Taumelfinger 78, der über ein Kugellager 80 auf einer Taumelhülse 82 gelagert ist. Die Taumelhülse 82 ist frei drehbar über ein Lager 84, das von einem Nadellager gebildet ist, an dem der Antriebseinheit zugewandten Ende 42 der Zwischenwelle 32 auf dieser gelagert. Zudem ist die Taumelhülse 82 in Axialrichtung 30 unbewegbar um die Zwischenwelle 32 angeordnet. An einem abtriebsseitigen Ende 86 der Taumelhülse 82 weist diese das Kopplungselement 76 auf, das von einer zur Innenverzahnung 58 des Schiebemittels 14 korrespondierenden Verzahnung gebildet ist und einstückig an die Taumelhülse 82 angeformt ist (Figur 1). Über die Innenverzahnung 58 des Schiebemittels 14 wird das Drehmoment auf das Kopplungselement 76 und somit auf die Taumelhülse 82 übertragen, und damit wird die Schlagwerksanordnung 34 angetrieben.In a further switching position of the sliding means 14, the pushing means 14 simultaneously transmits a driving torque to the coupling element 16 of the main driven means 18 and to the striking mechanism arrangement 34 or to a coupling element 76 of the striking mechanism arrangement 34 (FIG. FIG. 2 ). For this purpose, the pushing means 14 is pushed into an intermediate switching position along the axial direction 30 of the intermediate shaft 32, in which the coupling element 20 of the sliding means 14 is still in engagement with the coupling element 16 of the main driven means 18 and the internal teeth 58 of the sliding means 14 at the drive end 66 in the coupling element 76 of the striking mechanism arrangement 34 engages. The hand tool 10 thus simultaneously performs a drilling and chisel movement for a tool 38. The percussion arrangement 34 comprises a Tumble finger 78, which is mounted on a ball bearing 80 on a wobble sleeve 82. The wobble sleeve 82 is freely rotatable about a bearing 84, which is formed by a needle bearing, at which the drive unit facing end 42 of the intermediate shaft 32 mounted thereon. In addition, the wobble sleeve 82 is arranged immovably in the axial direction 30 about the intermediate shaft 32. At a driven-side end 86 of the wobble sleeve 82, this has the coupling element 76, which is formed by a toothing corresponding to the internal teeth 58 of the sliding means 14 and integrally formed on the wobble sleeve 82 ( FIG. 1 ). Via the internal teeth 58 of the sliding means 14, the torque is transmitted to the coupling element 76 and thus to the wobble sleeve 82, and thus the percussion mechanism assembly 34 is driven.

In einer dritten Schaltposition des Schiebemittels 14 auf der Zwischenwelle 32 überträgt diese ausschließlich ein Antriebsmoment auf die Schlagwerksanordnung 34 (Figur 3). Hierbei befindet sich das Schiebemittel 14 in einer antriebsseitigen Endstellung auf der Zwischenwelle 32, wobei die Innenverzahnung 58 des Schiebemittels 14 in Axialrichtung 30 vollständig in das Kopplungselement 76 der Taumelhülse 82 greift. Das Kopplungselement 20 des Schiebemittels 14 und das Kopplungselement 16 des Hauptabtriebsmittels 18 sind in einer entkoppelten Stellung zueinander, so dass sich die Handwerkzeugmaschine 10 in einem ausschließlichen Meißelbetrieb befindet.In a third switching position of the sliding means 14 on the intermediate shaft 32, this exclusively transmits a drive torque to the impact mechanism arrangement 34 (FIG. FIG. 3 ). Here, the sliding means 14 is in a drive-side end position on the intermediate shaft 32, wherein the internal teeth 58 of the sliding means 14 in the axial direction 30 engages completely in the coupling element 76 of the wobble sleeve 82. The coupling element 20 of the pusher 14 and the coupling element 16 of the main driven means 18 are in a decoupled position relative to each other, so that the hand tool 10 is in an exclusive chiseling operation.

Claims (7)

  1. Portable power tool, in particular hammer drill, having a percussive and a rotary drive and a switching device (12) which has a sliding means (14) which is provided to switch between different operating modes, and having a main output means (18), wherein the sliding means (14) has at least one coupling element (20) which, in at least one operating mode, couples directly to a coupling element (16) that is connected in a rotationally locked manner to the main output means (18), wherein the sliding means (14) is formed by a sliding sleeve, characterized in that the sliding sleeve is provided, in one operating mode, for simultaneously transmitting a torque to the main output means (18) and to a percussion mechanism arrangement (34).
  2. Portable power tool according to Claim 1, characterized in that the coupling element (20) of the sliding means (14) is formed by a toothing.
  3. Portable power tool according to either of the preceding claims, characterized in that the coupling element (20) is integrally formed on the sliding means (14).
  4. Portable power tool according to one of the preceding claims, characterized in that the coupling element (20) is arranged on a radially outwardly directed surface (22) of the sliding means (14).
  5. Portable power tool according to one of the preceding claims, characterized in that the coupling element (20) is arranged at one end (28) in an axial direction (30) of the sliding means (14).
  6. Portable power tool according to one of the preceding claims, characterized by an intermediate shaft (32) on which a subregion (70) of the sliding means (14) is directly arranged, said subregion (70) having the coupling element (20).
  7. Portable power tool at least according to Claim 6, characterized in that the sliding means (14) is arranged on the intermediate shaft (32) so as to be displaceable in the axial direction.
EP07821384.0A 2006-12-01 2007-10-16 Hand-held power tool Active EP2097225B1 (en)

Applications Claiming Priority (2)

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DE102006056849A DE102006056849A1 (en) 2006-12-01 2006-12-01 Hand tool
PCT/EP2007/061018 WO2008064955A1 (en) 2006-12-01 2007-10-16 Hand-held power tool

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EP2097225A1 EP2097225A1 (en) 2009-09-09
EP2097225B1 true EP2097225B1 (en) 2013-04-24

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US (1) US8281873B2 (en)
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CN (1) CN101541480B (en)
DE (1) DE102006056849A1 (en)
WO (1) WO2008064955A1 (en)

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US20100051303A1 (en) 2010-03-04
DE102006056849A1 (en) 2008-06-05
US8281873B2 (en) 2012-10-09
EP2097225A1 (en) 2009-09-09
CN101541480A (en) 2009-09-23
WO2008064955A1 (en) 2008-06-05
CN101541480B (en) 2012-02-29

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