EP2129496B1 - Hand machine tool - Google Patents

Hand machine tool Download PDF

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Publication number
EP2129496B1
EP2129496B1 EP08708761.5A EP08708761A EP2129496B1 EP 2129496 B1 EP2129496 B1 EP 2129496B1 EP 08708761 A EP08708761 A EP 08708761A EP 2129496 B1 EP2129496 B1 EP 2129496B1
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EP
European Patent Office
Prior art keywords
switching
spring
transmission
unit
leg
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
EP08708761.5A
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German (de)
French (fr)
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EP2129496A1 (en
Inventor
Andre Ullrich
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
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Robert Bosch GmbH
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Publication date
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Publication of EP2129496A1 publication Critical patent/EP2129496A1/en
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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
    • B25D16/003—Clutches specially adapted therefor
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs

Definitions

  • the invention relates to a hand tool according to the preamble of claim 1.
  • the invention consists in a hand tool with the features of claim 1.
  • a "mounting of the gear housing and the gear unit” is to be understood in particular a sliding of the gear housing to the gear unit or the gear unit in the gear housing along a preferred mounting direction.
  • a structurally simple assembly of the switching spring to the operating unit at a simultaneous assembly of the gear housing and the gear unit can be achieved.
  • the actuating unit is operatively arranged in a first switching position after assembly of the transmission housing with the transmission unit. The actuating unit is advantageously provided for switching between at least two different switching positions.
  • a "mounting direction” should be understood to mean, in particular, a direction in which there is a translatory relative movement of the gear housing relative to the gear unit during assembly of the gear housing with the gear unit.
  • the spring legs are provided for movement in an axial direction of at least one switching means of the gear unit when moving in a direction of rotation of the actuating unit, an advantageous transformation of a switching movement can be achieved while saving further components.
  • the switching spring forms at least one energy storage means in which a switching force can be stored, which advantageously a particularly low-wear switching between two switching means having mutually synchronous switching positions, can be achieved. If the two switching means in a twisted position to each other, the switching force can be advantageously stored in the switching spring until the two switching means occupy synchronous switching positions and shifting one of the two switching means in the direction of the other switching means can be done due to the stored switching force and thus the two switching means for the purpose of torque transmission can interlock.
  • At least one spring leg of the switch spring has a shift bevel against which the transmission element presses during at least one switching operation, whereby structurally simple axial movement of a switch spring connected to the switching means during a rotational movement of the actuator unit can be achieved.
  • This can be achieved particularly advantageously if the shift bevel of the spring leg has at least one guide surface to a guide of the transmission element.
  • the two spring legs each have a leg portion, wherein the two leg portions are arranged in a region of the transmission element in a plane parallel to the mounting direction, whereby a particularly simple transmission of a movement, in particular a rotational movement of the actuating unit, by means of the transmission element on the switching spring or on the spring legs is possible.
  • the switching spring also has a partial area for receiving a switching means of the gear unit, advantageously a direct coupling to the switching means can be achieved while saving further components.
  • FIG. 1 an illustrated by a hammer drill hand tool 10 is shown.
  • the hand tool 10 comprises a housing 54 with a gear housing 12 and in a front region a tool holder 56 for receiving a tool.
  • the handheld power tool 10 comprises a main handle 58 for actuating the handheld power tool 10 and for transmitting power from an operator to the handheld power tool 10.
  • the handheld power tool 10 has a drive unit 60 formed by an electric motor.
  • the drive torque of the drive unit 60 is via an intermediate shaft 62 of the power tool on a percussion 64, the sake of clarity in FIG. 2 is shown only partially, and / or a rotating, formed by a hammer tube 66 driven means ( FIG. 2 ).
  • the handheld power tool 10 has a switching device 16 with an actuating unit 20 comprising a toggle handle 68.
  • FIG. 2 is a portion of the power tool 10 with a gear unit 14, which has the switching device 16, and the transmission housing 12 shown.
  • the switching device 16 has a switching spring 18 and the operating unit 20 mounted in the gear housing 12 and is provided for switching between different gear stages of the gear unit 14.
  • the switching spring 18 transmits a rotational movement of the actuating unit 20 to an axially movable, formed by a switching plate switching means 36 of the transmission unit 14.
  • the switching spring 18 has two spring legs 26, 28 which span a receiving area 24 to receive a transmission element 22 of the actuator 20.
  • the receiving portion 24 for receiving the transmission element 22 allows for a mounting of the gear housing 12 with the gear unit 14 along a mounting direction 30, which is perpendicular to the plane in FIG. 2 aligned with the plane of the drawing, the transmission housing 12 with the already mounted in the transmission housing 12 actuator 20 relative to the transmission unit 14 to the transmission unit 14 to push.
  • the two spring legs 26, 28 of the switching spring 18 are arranged perpendicular to the mounting direction 30 spaced from each other.
  • the two spring legs 26, 28 are arranged in a direction 74, which is aligned substantially perpendicular to the axis of rotation 72 and perpendicular to the mounting direction 30, spaced from each other.
  • the two spring legs 26, 28 are arranged parallel to the axis of rotation 72 spaced from each other.
  • the first leg region 80 of the first spring leg 26 in the mounting direction 30 has a greater length along the direction 74 than the first leg region 82 of the second spring leg 28 in the mounting direction 30.
  • the first leg region 82 of the second spring leg 28 is perpendicular to the first leg region 82 a second leg portion 84 extending in a direction of superposition of the mounting direction 30 and the rotation axis 72 in the direction of the actuator unit 20.
  • the second spring leg 26 comprises a third leg region 86, which extends in the direction 74 perpendicular to the second leg region 84 and adjoins the second leg region 84.
  • the third leg region 86 abuts the transmission element 22 in the mounting direction 30 after the transmission element 22 of the actuating unit 20.
  • the guide rod 94 has a stop means 100 formed by a snap ring, which is fixedly arranged on the guide rod 94.
  • the switching means 36 also has a coupling region 102 for coupling to a gear element 104 of the gear unit 14 formed by a gear unit (FIG. FIGS. 3 to 5 ).
  • the transmission element 104 of the gear unit is movably mounted on the intermediate shaft 62 in the axial direction 34 for shifting the different gear stages.
  • the transmission element 104 has a receiving groove 106 into which the coupling region 102 of the switching means 36 engages.
  • the switching means 36 For a guide or a support of the two spring legs 26, 28 on the switching means 36, the switching means 36 has a portion 108 which extends substantially parallel to the mounting direction 30 and substantially parallel to the axis of rotation 72. The two spring legs 26, 28 are guided between the portion 108 and the guide rod 94. Further, the switching means 36 along the axial direction 34 on a side facing the stop means 100 and on a side facing away from the stop means 100 side each have a lateral edge 110, which together with the portion 108 and the guide rod 94, the two spring legs 26, 28 in one desired position holds.
  • FIG. 4a a first switching position of the actuating unit 20 and the switching means 36 on the guide rod 94 is shown.
  • the transmission element 22 of the actuating unit 20 is in the first switching position on the third leg portion 86 of the second spring leg 28 at.
  • the switching means 36 is located in a voltage applied to the stop means 100 end position on the guide rod 94.
  • the transmission element 104 of the transmission unit 14 has a gear 112 for transmitting a drive torque to the hammer tube 66 and a second gear 114, which with a second, rotatably mounted on the intermediate shaft 62 gear unit 116 of the transmission unit 14 in a second switching position of the switching means 36 and the actuating unit 20 can be coupled.
  • the transmission element 22 of the actuating unit 20 moves along a circular arc toward the third leg region 90 of the first spring leg 26.
  • the transmission element 22 exerts a pressure against the direction 98 on the first spring limb 26, which moves in the axial direction 34 counter to the direction 98 of the switch spring 18 and the switching means 36 on the guide rod 94 leads.
  • the kinetic energy is transmitted from the switching spring 18 to the switching means 36, so that the switching means 36 together with the transmission element 104th is moved counter to the direction 98 and the second gear 114 is in engagement with the inner contour 118 of the second gear unit 116.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einer Handwerkzeugmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a hand tool according to the preamble of claim 1.

Eine derartige Handwerkzeugmaschine geht beispielsweise aus der DE 10 2004 045 117 A1 hervor. Es ist bereits eine Handwerkzeugmaschine bekannt, die ein Getriebegehäuse und eine Getriebeeinheit mit einer Schaltvorrichtung aufweist. Die Schaltvorrichtung weist zudem eine Schaltfeder und eine in das Getriebegehäuse montierbare Betätigungseinheit mit einem Übertragungselement auf.Such a hand tool machine, for example, goes from the DE 10 2004 045 117 A1 out. There is already known a hand tool machine which has a gear housing and a gear unit with a switching device. The switching device also has a switching spring and an operating unit which can be mounted in the transmission housing and has a transmission element.

Vorteile der ErfindungAdvantages of the invention

Die Erfindung besteht in einer Handwerkzeugmaschine mit den Merkmalen des Anspruchs 1.The invention consists in a hand tool with the features of claim 1.

In diesem Zusammenhang soll unter einer "Montage des Getriebegehäuses und der Getriebeeinheit" insbesondere ein Schieben des Getriebegehäuses auf die Getriebeeinheit bzw. der Getriebeeinheit in das Getriebegehäuse entlang einer bevorzugten Montagerichtung verstanden werden. Bei der erfindungsgemäßen Ausgestaltung der Handwerkzeugmaschine kann eine konstruktiv einfache Montage der Schaltfeder an die Betätigungseinheit bei einer gleichzeitigen Montage des Getriebegehäuses und der Getriebeeinheit erreicht werden. Vorzugsweise ist die Betätigungseinheit nach einer Montage des Getriebegehäuses mit der Getriebeeinheit betriebsbereit in einer ersten Schaltposition angeordnet. Die Betätigungseinheit ist vorteilhafterweise zu einem Schalten zwischen zumindest zwei unterschiedlichen Schaltpositionen vorgesehen.In this context, a "mounting of the gear housing and the gear unit" is to be understood in particular a sliding of the gear housing to the gear unit or the gear unit in the gear housing along a preferred mounting direction. In the embodiment of the portable power tool according to the invention, a structurally simple assembly of the switching spring to the operating unit at a simultaneous assembly of the gear housing and the gear unit can be achieved. Preferably, the actuating unit is operatively arranged in a first switching position after assembly of the transmission housing with the transmission unit. The actuating unit is advantageously provided for switching between at least two different switching positions.

Es wird vorgeschlagen, dass die zwei Federschenkel senkrecht zu einer Montagerichtung beabstandet angeordnet sind, wodurch ein verschleißarmes Einführen der Betätigungseinheit in den Aufnahmebereich der Schaltfeder erreicht werden kann. Unter einer "Montagerichtung" soll hierbei insbesondere eine Richtung verstanden werden, in der eine translatorische Relativbewegung des Getriebegehäuses gegenüber der Getriebeeinheit bei einer Montage des Getriebegehäuses mit der Getriebeeinheit erfolgt.It is proposed that the two spring legs are arranged perpendicular to a mounting direction, whereby a low-wear insertion of the actuating unit can be achieved in the receiving area of the switching spring. In this case, a "mounting direction" should be understood to mean, in particular, a direction in which there is a translatory relative movement of the gear housing relative to the gear unit during assembly of the gear housing with the gear unit.

Sind die Federschenkel bei einer Bewegung in eine Drehrichtung der Betätigungseinheit zu einer Bewegung in eine axiale Richtung zumindest eines Schaltmittels der Getriebeeinheit vorgesehen, kann damit eine vorteilhafte Transformation einer Schaltbewegung unter Einsparung weiterer Bauteile erreicht werden.If the spring legs are provided for movement in an axial direction of at least one switching means of the gear unit when moving in a direction of rotation of the actuating unit, an advantageous transformation of a switching movement can be achieved while saving further components.

In einer weiteren bevorzugten Ausgestaltung der Erfindung wird vorgeschlagen, dass die Schaltfeder zumindest ein Energiespeichermittel bildet, in dem eine Schaltkraft speicherbar ist, wodurch vorteilhaft ein besonders verschleißarmes Schalten zwischen zwei Schaltmitteln, die zueinander synchrone Schaltpositionen aufweisen, erreicht werden kann. Sind die beiden Schaltmittel in einer verdrehten Position zueinander, kann die Schaltkraft vorteilhaft in der Schaltfeder gespeichert werden, bis die beiden Schaltmittel synchrone Schaltpositionen einnehmen und ein Verschieben eines der beiden Schaltmittels in Richtung des anderen Schaltmittels aufgrund der gespeicherten Schaltkraft erfolgen kann und damit die beiden Schaltmittel zwecks einer Drehmomentübertragung ineinander eingreifen können.In a further preferred embodiment of the invention it is proposed that the switching spring forms at least one energy storage means in which a switching force can be stored, which advantageously a particularly low-wear switching between two switching means having mutually synchronous switching positions, can be achieved. If the two switching means in a twisted position to each other, the switching force can be advantageously stored in the switching spring until the two switching means occupy synchronous switching positions and shifting one of the two switching means in the direction of the other switching means can be done due to the stored switching force and thus the two switching means for the purpose of torque transmission can interlock.

Weiterhin wird vorzugsweise vorgeschlagen, dass zumindest ein Federschenkel der Schaltfeder eine Schaltschräge aufweist, gegen die das Übertragungselement während zumindest eines Schaltvorgangs drückt, wodurch konstruktiv einfach eine axiale Bewegung eines mit der Schaltfeder verbundenen Schaltmittels während einer Drehbewegung der Betätigungseinheit erreicht werden kann. Besonders vorteilhaft kann dies erreicht werden, wenn die Schaltschräge des Federschenkels zumindest eine Führungsfläche zu einer Führung des Übertragungselements aufweist.Furthermore, it is preferably proposed that at least one spring leg of the switch spring has a shift bevel against which the transmission element presses during at least one switching operation, whereby structurally simple axial movement of a switch spring connected to the switching means during a rotational movement of the actuator unit can be achieved. This can be achieved particularly advantageously if the shift bevel of the spring leg has at least one guide surface to a guide of the transmission element.

Es wird ferner vorzugsweise vorgeschlagen, dass die beiden Federschenkel jeweils einen Schenkelbereich aufweisen, wobei die beiden Schenkelbereiche in einem Bereich des Übertragungselements in einer parallelen Ebene zur Montagerichtung angeordnet sind, wodurch eine besonders einfache Übertragung einer Bewegung, insbesondere einer Drehbewegung der Betätigungseinheit, mittels des Übertragungselements auf die Schaltfeder bzw. auf die Federschenkel möglich ist.It is further preferably proposed that the two spring legs each have a leg portion, wherein the two leg portions are arranged in a region of the transmission element in a plane parallel to the mounting direction, whereby a particularly simple transmission of a movement, in particular a rotational movement of the actuating unit, by means of the transmission element on the switching spring or on the spring legs is possible.

Weist die Schaltfeder zudem einen Teilbereich zu einer Aufnahme eines Schaltmittels der Getriebeeinheit auf, kann vorteilhaft eine direkte Ankopplung an das Schaltmittel unter Einsparung weiterer Bauteile erreicht werden.If the switching spring also has a partial area for receiving a switching means of the gear unit, advantageously a direct coupling to the switching means can be achieved while saving further components.

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. Es zeigen:

Fig. 1
eine erfindungsgemäße Handwerkzeugmaschine mit einer Schaltvorrichtung,
Fig. 2
einen Teilbereich der Handwerkzeugmaschine mit einer Getriebeeinheit und einem Getriebegehäuse in einer Schnittdarstellung,
Fig. 3
die Schaltvorrichtung in einer Seitenansicht,
Fig. 4
die Schaltvorrichtung in einer perspektivischen Ansicht und
Fig. 5
die Schaltvorrichtung und die Getriebeeinheit in einer ersten Schaltposition (Fig. 5a) und in einer zweiten Schaltposition (Fig. 5b) in einer perspektivischen Ansicht.
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. Show it:
Fig. 1
a hand tool according to the invention with a switching device,
Fig. 2
a portion of the power tool with a gear unit and a gear housing in a sectional view,
Fig. 3
the switching device in a side view,
Fig. 4
the switching device in a perspective view and
Fig. 5
the switching device and the gear unit in a first switching position ( Fig. 5a ) and in a second switching position ( Fig. 5b ) in a perspective view.

Beschreibung des AusführungsbeispielsDescription of the embodiment

In Figur 1 ist eine von einem Bohrhammer gebildete Handwerkzeugmaschine 10 dargestellt. Die Handwerkzeugmaschine 10 umfasst ein Gehäuse 54 mit einem Getriebegehäuse 12 und in einem Frontbereich eine Werkzeugaufnahme 56 zu einer Aufnahme eines Werkzeugs. An einer dem Frontbereich abgewandten Seite umfasst die Handwerkzeugmaschine 10 einen Haupthandgriff 58 zu einem Betätigen der Handwerkzeugmaschine 10 und zu einer Kraftübertragung von einem Bediener auf die Handwerkzeugmaschine 10. Zu einer Erzeugung eines Antriebsmoments weist die Handwerkzeugmaschine 10 eine von einem Elektromotor gebildete Antriebseinheit 60 auf. Das Antriebsmoment der Antriebseinheit 60 wird über eine Zwischenwelle 62 der Handwerkzeugmaschine auf ein Schlagwerk 64, das der Übersichtlichkeit halber in Figur 2 nur teilweise dargestellt ist, und/oder ein rotierendes, von einem Hammerrohr 66 gebildetes Abtriebsmittel übertragen (Figur 2). Zu einem Umschalten zwischen unterschiedlichen Antriebsgeschwindigkeiten und/oder Antriebsarten eines in der Werkzeugaufnahme 56 befindlichen Werkzeugs weist die Handwerkzeugmaschine 10 eine Schaltvorrichtung 16 mit einer einen Knebelgriff 68 umfassenden Betätigungseinheit 20 auf.In FIG. 1 an illustrated by a hammer drill hand tool 10 is shown. The hand tool 10 comprises a housing 54 with a gear housing 12 and in a front region a tool holder 56 for receiving a tool. On a side facing away from the front region, the handheld power tool 10 comprises a main handle 58 for actuating the handheld power tool 10 and for transmitting power from an operator to the handheld power tool 10. For generating a drive torque, the handheld power tool 10 has a drive unit 60 formed by an electric motor. The drive torque of the drive unit 60 is via an intermediate shaft 62 of the power tool on a percussion 64, the sake of clarity in FIG. 2 is shown only partially, and / or a rotating, formed by a hammer tube 66 driven means ( FIG. 2 ). For switching over between different drive speeds and / or drive types of a tool located in the tool holder 56, the handheld power tool 10 has a switching device 16 with an actuating unit 20 comprising a toggle handle 68.

In Figur 2 ist ein Teilbereich der Handwerkzeugmaschine 10 mit einer Getriebeeinheit 14, die die Schaltvorrichtung 16 aufweist, und dem Getriebegehäuse 12 dargestellt. Die Schaltvorrichtung 16 weist eine Schaltfeder 18 und die in das Getriebegehäuse 12 montierte Betätigungseinheit 20 auf und ist zu einem Schalten zwischen unterschiedlichen Getriebestufen der Getriebeeinheit 14 vorgesehen. Hierzu überträgt die Schaltfeder 18 eine Drehbewegung der Betätigungseinheit 20 auf ein axial bewegbares, von einem Schaltblech gebildetes Schaltmittel 36 der Getriebeeinheit 14. Die Schaltfeder 18 weist zwei Federschenkel 26, 28 auf, die einen Aufnahmebereich 24 aufspannen zu einer Aufnahme eines Übertragungselements 22 der Betätigungseinheit 20. Das Übertragungselement 22 ist stegförmig ausgebildet und an einer dem Knebelgriff 68 abgewandten, inneren Seite 70 der Betätigungseinheit 20 entlang einer Richtung einer Drehachse 72 der Betätigungseinheit 20 an dieser exzentrisch zur Drehachse 72 angeordnet (Figuren 2 und 3). Bei einem Schalten bzw. bei einer Drehbewegung der Betätigungseinheit 20 durch einen Bediener der Handwerkzeugmaschine 10 überträgt das stegförmige Übertragungselement 22, das exzentrisch zur Drehachse 72 angeordnet ist, eine Kraft auf einen der beiden Federschenkel 26, 28 der Schaltfeder 18 (Figuren 2 bis 5).In FIG. 2 is a portion of the power tool 10 with a gear unit 14, which has the switching device 16, and the transmission housing 12 shown. The switching device 16 has a switching spring 18 and the operating unit 20 mounted in the gear housing 12 and is provided for switching between different gear stages of the gear unit 14. For this purpose, the switching spring 18 transmits a rotational movement of the actuating unit 20 to an axially movable, formed by a switching plate switching means 36 of the transmission unit 14. The switching spring 18 has two spring legs 26, 28 which span a receiving area 24 to receive a transmission element 22 of the actuator 20. The transmission element 22 is web-shaped and facing away from the toggle handle 68, inner side 70 of the actuator 20 along a direction of rotation axis 72 of the actuator 20 arranged at this eccentric to the axis of rotation 72 ( Figures 2 and 3 ). When switching or during a rotational movement of the actuating unit 20 by an operator of the power tool 10 transmits the web-shaped transmission element 22 which is arranged eccentrically to the rotation axis 72, a force on one of the two spring legs 26, 28 of the switching spring 18 (FIG. FIGS. 2 to 5 ).

Der Aufnahmebereich 24 zur Aufnahme des Übertragungselements 22 ermöglicht bei einer Montage des Getriebegehäuses 12 mit der Getriebeeinheit 14 entlang einer Montagerichtung 30, die senkrecht zur Zeichenebene in Figur 2 in die Zeichenebene hinein ausgerichtet ist, das Getriebegehäuse 12 mit der bereits in das Getriebegehäuse 12 montierten Betätigungseinheit 20 relativ zur Getriebeeinheit 14 auf die Getriebeeinheit 14 zu schieben. Hierzu sind die beiden Federschenkel 26, 28 der Schaltfeder 18 senkrecht zu der Montagerichtung 30 beabstandet zueinander angeordnet. Die beiden Federschenkel 26, 28 sind dabei in eine Richtung 74, die im Wesentlichen senkrecht zur Drehachse 72 und senkrecht zur Montagerichtung 30 ausgerichtet ist, beabstandet zueinander angeordnet. Zusätzlich sind die beiden Federschenkel 26, 28 parallel zur Drehachse 72 beabstandet zueinander angeordnet.The receiving portion 24 for receiving the transmission element 22 allows for a mounting of the gear housing 12 with the gear unit 14 along a mounting direction 30, which is perpendicular to the plane in FIG. 2 aligned with the plane of the drawing, the transmission housing 12 with the already mounted in the transmission housing 12 actuator 20 relative to the transmission unit 14 to the transmission unit 14 to push. For this purpose, the two spring legs 26, 28 of the switching spring 18 are arranged perpendicular to the mounting direction 30 spaced from each other. The two spring legs 26, 28 are arranged in a direction 74, which is aligned substantially perpendicular to the axis of rotation 72 and perpendicular to the mounting direction 30, spaced from each other. In addition, the two spring legs 26, 28 are arranged parallel to the axis of rotation 72 spaced from each other.

Zu einer Übertragung einer Kraft während einer Schaltbewegung bzw. während einer Drehbewegung der Betätigungseinheit 20 von der Schaltfeder 18 auf das Schaltmittel 36 weist die Schaltfeder 18 einen Teilbereich 52 auf, der von einer Schraubenfeder gebildet ist (Figuren 2 bis 4). Der Teilbereich 52 mit der Schraubenfeder umgibt dabei einen Aufnahmebereich zur Aufnahme des Schaltmittels 36. Hierzu weist das Schaltmittel 36 ein stegförmiges Kopplungselement 76 an einer der Betätigungseinheit 20 zugewandten Seite 78 auf (Figur 3). Die beiden Federschenkel 26, 28 weisen jeweils einen ersten Schenkelbereich 80, 82 auf, der sich von dem Teilbereich 52 mit der Schraubenfeder aus in die Richtung 74 erstreckt (Figuren 3 bis 5). Der erste Schenkelbereich 80 des in Montagerichtung 30 ersten Federschenkels 26 weist dabei eine größere Länge entlang der Richtung 74 auf als der erste Schenkelbereich 82 des in Montagerichtung 30 zweiten Federschenkels 28. An den ersten Schenkelbereich 82 des zweiten Federschenkels 28 schließt sich senkrecht zum ersten Schenkelbereich 82 ein zweiter Schenkelbereich 84 an, der sich in eine Richtung einer Überlagerung von der Montagerichtung 30 und der Drehachse 72 in Richtung der Betätigungseinheit 20 erstreckt. Des Weiteren umfasst der zweite Federschenkel 26 einen dritten Schenkelbereich 86, der sich senkrecht zum zweiten Schenkelbereich 84 in die Richtung 74 erstreckt und sich an den zweiten Schenkelbereich 84 anschließt. Der dritte Schenkelbereich 86 liegt in Montagerichtung 30 nach dem Übertragungselement 22 der Betätigungseinheit 20 an dem Übertragungselement 22 an.For a transmission of a force during a switching movement or during a rotational movement of the actuating unit 20 from the switching spring 18 to the switching means 36, the switching spring 18 on a portion 52 which is formed by a coil spring ( FIGS. 2 to 4 ). The partial region 52 with the helical spring surrounds a receiving region for receiving the switching element 36. For this purpose, the switching element 36 has a web-shaped coupling element 76 on a side 78 facing the actuating element 20 (FIG. FIG. 3 ). The two spring legs 26, 28 each have a first leg area 80, 82 which extends from the portion 52 with the coil spring in the direction 74 ( FIGS. 3 to 5 ). The first leg region 80 of the first spring leg 26 in the mounting direction 30 has a greater length along the direction 74 than the first leg region 82 of the second spring leg 28 in the mounting direction 30. The first leg region 82 of the second spring leg 28 is perpendicular to the first leg region 82 a second leg portion 84 extending in a direction of superposition of the mounting direction 30 and the rotation axis 72 in the direction of the actuator unit 20. Furthermore, the second spring leg 26 comprises a third leg region 86, which extends in the direction 74 perpendicular to the second leg region 84 and adjoins the second leg region 84. The third leg region 86 abuts the transmission element 22 in the mounting direction 30 after the transmission element 22 of the actuating unit 20.

Senkrecht zum ersten Schenkelbereich 80 des ersten Federschenkels 26 schließt sich ein zweiter Schenkelbereich 88 an, der parallel zur Drehachse 72 in Richtung der Betätigungseinheit 20 verläuft. An den zweiten Schenkelbereich 88 des ersten Federschenkels 26 erstreckt sich senkrecht dazu ein dritter Schenkelbereich 90, der zunächst parallel zur Montagerichtung 30 verläuft. Der dritte Schenkelbereich 90 des ersten Federschenkels 26 umfasst zudem eine Schaltschräge 42, die neben einer Erstreckungskomponente in die Montagerichtung 30 eine Erstreckungskomponente in die Richtung 74 aufweist. An den dritten Schenkelbereich 90 schließt sich ein vierter Schenkelbereich 92 des ersten Federschenkels 26 an, der sich in Richtung 74 erstreckt. Der vierte Schenkelbereich 92 des ersten Federschenkels 26 und der dritte Schenkelbereich 86 des zweiten Federschenkels 28 sind dabei im Wesentlichen innerhalb einer Ebene, die sich parallel zur Montagerichtung 30 erstreckt, angeordnet.Perpendicular to the first leg region 80 of the first spring leg 26, a second leg region 88 connects, which extends parallel to the axis of rotation 72 in the direction of the actuating unit 20. At the second leg portion 88 of the first spring leg 26 extends perpendicular thereto, a third leg portion 90 which is initially parallel to the mounting direction 30. The third leg region 90 of the first spring leg 26 also includes a shift bevel 42 which, in addition to an extension component in the mounting direction 30, has an extension component in the direction 74. A fourth leg region 92 of the first spring leg 26, which extends in the direction 74, adjoins the third leg region 90. The fourth leg region 92 of the first spring leg 26 and the third leg region 86 of the second spring leg 28 are arranged substantially within a plane which extends parallel to the mounting direction 30.

Während eines Schaltens bzw. eines Bewegens der Betätigungseinheit 20 in eine Drehrichtung 32 durch einen Bediener der Handwerkzeugmaschine 10 wird mittels der Schaltfeder 18 das Schaltmittel 36 in eine axiale Richtung 34 bewegt. Hierzu ist das Schaltmittel 36 auf einer Führungsstange 94 der Getriebeeinheit 14 entlang der axialen Richtung 34, die parallel zur Montagerichtung 30 verläuft, bewegbar gelagert (Figuren 5a und 5b). Das Schaltmittel 36 weist zwei ringförmige Bereiche 96 auf, die zu einer Aufnahme der Führungsstange 94 vorgesehen sind. Die beiden Bereiche 96 sind entlang der Führungsstange 94 nacheinander an dem Schaltmittel 36 angeordnet. Um eine Bewegung des Schaltmittels 36 in eine Richtung 98 auf der Führungsstange 94 zu begrenzen, weist die Führungsstange 94 ein von einem Sprengring gebildetes Anschlagmittel 100 auf, das fest auf der Führungsstange 94 angeordnet ist. Das Schaltmittel 36 weist zudem einen Kopplungsbereich 102 zu einer Ankopplung an ein von einer Zahnradeinheit gebildetes Getriebeelement 104 der Getriebeeinheit 14 auf (Figuren 3 bis 5). Das Getriebeelement 104 der Getriebeeinheit ist auf der Zwischenwelle 62 in axialer Richtung 34 zu einem Schalten der unterschiedlichen Getriebestufen bewegbar gelagert. Zu einer Ankopplung des Schaltmittels 36 an das Getriebeelement 104 weist das Getriebeelement 104 eine Aufnahmenut 106 auf, in die der Kopplungsbereich 102 des Schaltmittels 36 eingreift.During a shift or a movement of the actuating unit 20 in a direction of rotation 32 by an operator of the power tool 10, the switching means 36 is moved in an axial direction 34 by means of the switching spring 18. For this purpose, the switching means 36 is on a Guide rod 94 of the gear unit 14 along the axial direction 34 which is parallel to the mounting direction 30, movably mounted ( FIGS. 5a and 5b ). The switching means 36 has two annular regions 96, which are provided for receiving the guide rod 94. The two regions 96 are arranged successively along the guide rod 94 on the switching means 36. In order to limit a movement of the switching means 36 in a direction 98 on the guide rod 94, the guide rod 94 has a stop means 100 formed by a snap ring, which is fixedly arranged on the guide rod 94. The switching means 36 also has a coupling region 102 for coupling to a gear element 104 of the gear unit 14 formed by a gear unit (FIG. FIGS. 3 to 5 ). The transmission element 104 of the gear unit is movably mounted on the intermediate shaft 62 in the axial direction 34 for shifting the different gear stages. For a coupling of the switching means 36 to the transmission element 104, the transmission element 104 has a receiving groove 106 into which the coupling region 102 of the switching means 36 engages.

Zu einer Führung bzw. einer Abstützung der beiden Federschenkel 26, 28 an dem Schaltmittel 36 weist das Schaltmittel 36 einen Teilbereich 108 auf, der sich im Wesentlichen parallel zur Montagerichtung 30 und im Wesentlichen parallel zur Drehachse 72 erstreckt. Die beiden Federschenkel 26, 28 werden dabei zwischen dem Teilbereich 108 und der Führungsstange 94 geführt. Ferner weist das Schaltmittel 36 entlang der axialen Richtung 34 an einer dem Anschlagmittel 100 zugewandten Seite und an einer dem Anschlagmittel 100 abgewandten Seite jeweils eine seitliche Flanke 110 auf, die zusammen mit dem Teilbereich 108 und der Führungsstange 94 die beiden Federschenkel 26, 28 in einer gewünschte Position hält.For a guide or a support of the two spring legs 26, 28 on the switching means 36, the switching means 36 has a portion 108 which extends substantially parallel to the mounting direction 30 and substantially parallel to the axis of rotation 72. The two spring legs 26, 28 are guided between the portion 108 and the guide rod 94. Further, the switching means 36 along the axial direction 34 on a side facing the stop means 100 and on a side facing away from the stop means 100 side each have a lateral edge 110, which together with the portion 108 and the guide rod 94, the two spring legs 26, 28 in one desired position holds.

In Figur 4a ist eine erste Schaltposition der Betätigungseinheit 20 bzw. des Schaltmittels 36 auf der Führungsstange 94 dargestellt. Das Übertragungselement 22 der Betätigungseinheit 20 liegt in der ersten Schaltposition an dem dritten Schenkelbereich 86 des zweiten Federschenkels 28 an. Das Schaltmittel 36 befindet sich dabei in einer am Anschlagmittel 100 anliegenden Endposition auf der Führungsstange 94. Das Getriebeelement 104 der Getriebeeinheit 14 weist ein Zahnrad 112 zu einer Übertragung eines Antriebsmoments auf das Hammerrohr 66 und ein zweites Zahnrad 114 auf, das mit einer zweiten, drehend auf der Zwischenwelle 62 gelagerten Zahnradeinheit 116 der Getriebeeinheit 14 in einer zweiten Schaltposition des Schaltmittels 36 bzw. der Betätigungseinheit 20 koppelbar ist.In FIG. 4a a first switching position of the actuating unit 20 and the switching means 36 on the guide rod 94 is shown. The transmission element 22 of the actuating unit 20 is in the first switching position on the third leg portion 86 of the second spring leg 28 at. The switching means 36 is located in a voltage applied to the stop means 100 end position on the guide rod 94. The transmission element 104 of the transmission unit 14 has a gear 112 for transmitting a drive torque to the hammer tube 66 and a second gear 114, which with a second, rotatably mounted on the intermediate shaft 62 gear unit 116 of the transmission unit 14 in a second switching position of the switching means 36 and the actuating unit 20 can be coupled.

Bei einer Drehbewegung der Betätigungseinheit 20 in die Drehrichtung 32 von einer ersten Schaltposition in eine zweite Schaltposition (Figuren 5a und 5b) bewegt sich das Übertragungselement 22 der Betätigungseinheit 20 entlang eines Kreisbogens auf den dritten Schenkelbereich 90 des ersten Federschenkels 26 zu. Sobald das Übertragungselement 22 auf die Schaltschräge 42 des dritten Schenkelbereichs 90 trifft, übt das Übertragungselement 22 einen Druck entgegen der Richtung 98 auf den ersten Federschenkel 26 aus, der zu einer Bewegung in die axiale Richtung 34 entgegen der Richtung 98 der Schaltfeder 18 und des Schaltmittels 36 auf der Führungsstange 94 führt. Die Schaltschräge 42 weist an einer dem Übertragungselement 22 zugewandten Seite eine Führungsfläche 44 auf, die zu einer Führung des Übertragungselements 22 in die zweite Schaltposition führt und gleichzeitig das Schaltmittel 36 auf der Führungsstange 94 weiter entgegen die Richtung 98 bewegt. Befindet sich die Betätigungseinheit 20 bzw. das Übertragungselement 22 in der zweiten Schaltposition (Figur 5b), liegt an dem Übertragungselement 22 der vierte Schenkelbereich 92 des ersten Federschenkels 26 an und verhindert dabei ein ungewolltes Zurückbewegen der Schaltfeder 18 bzw. des Schaltmittels 36 aus der zweiten Schaltposition. In der zweiten Schaltposition befindet sich das zweite Zahnrad 114 des Getriebeelements 104 in Eingriff mit einer zum zweiten Zahnrad 114 korrespondierenden Innenkontur 118 der zweiten Zahnradeinheit 116. Ist bei einem Schalten von der ersten in die zweite Schaltposition ein Schaltweg des Schaltmittels 36 blockiert bzw. sind das zweite Zahnrad 114 des Getriebeelements 104 und die Innenkontur 118 in einer verdrehten Position zueinander, die einen Eingriff des zweiten Zahnrads 114 in die Innenkontur 118 verhindert, bildet die Schaltfeder 18 ein Energiespeichermittel 38, in dem eine Schaltkraft zum Bewegen des Getriebeelements 104 in die zweite Schaltposition speicherbar ist. Sobald der Schaltweg frei ist bzw. das zweite Zahnrad 114 und die Innenkontur 118 der zweiten Zahnradeinheit 116 in einer übereinstimmenden, synchronen Position sind, wird die Bewegungsenergie von der Schaltfeder 18 auf das Schaltmittel 36 übertragen, so dass das Schaltmittel 36 zusammen mit dem Getriebeelement 104 entgegen der Richtung 98 weiterbewegt wird und das zweite Zahnrad 114 in Eingriff mit der Innenkontur 118 der zweiten Zahnradeinheit 116 ist.During a rotational movement of the actuating unit 20 in the direction of rotation 32 from a first switching position to a second switching position (FIG. FIGS. 5a and 5b ), the transmission element 22 of the actuating unit 20 moves along a circular arc toward the third leg region 90 of the first spring leg 26. As soon as the transmission element 22 strikes the control slope 42 of the third leg region 90, the transmission element 22 exerts a pressure against the direction 98 on the first spring limb 26, which moves in the axial direction 34 counter to the direction 98 of the switch spring 18 and the switching means 36 on the guide rod 94 leads. The shift bevel 42 has on a side facing the transfer element 22 a guide surface 44, which leads to a guide of the transfer element 22 in the second shift position and at the same time the switching means 36 moves on the guide rod 94 against the direction 98. Is the actuating unit 20 or the transmission element 22 in the second switching position ( FIG. 5b ), is applied to the transmission element 22 of the fourth leg portion 92 of the first spring leg 26 and thereby prevents accidental retraction of the switching spring 18 and the switching means 36 from the second switching position. In the second switching position, the second gear 114 of the gear member 104 is in engagement with a corresponding to the second gear 114 inner contour 118 of the second gear unit 116. When switching from the first to the second switching position, a switching path of the switching means 36 is blocked or are second gear 114 of the gear member 104 and the inner contour 118 in a twisted position to each other, which prevents engagement of the second gear 114 in the inner contour 118, the switching spring 18 forms an energy storage means 38 in which a switching force for moving the gear member 104 in the second switching position storable is. Once the switching path is clear or the second gear 114 and the inner contour 118 of the second gear unit 116 in a matching, synchronous position, the kinetic energy is transmitted from the switching spring 18 to the switching means 36, so that the switching means 36 together with the transmission element 104th is moved counter to the direction 98 and the second gear 114 is in engagement with the inner contour 118 of the second gear unit 116.

Wird die Betätigungseinheit 20 von der zweiten Schaltposition in die erste Schaltposition entlang der Drehrichtung 32 gedreht, drückt das Übertragungselement 22 gegen den dritten Schenkelbereich 86 des zweiten Federschenkels 28 und bewegt dabei die Schaltfeder 18 und zusammen mit dieser das Schaltmittel 36 auf der Führungsstange 94 und das Getriebeelement 104 auf der Zwischenwelle 62 in die Richtung 98. Während des Schaltvorgangs bewegt sich das Übertragungselement 22 von einem dem zweiten Schenkelbereich 84 des zweiten Federschenkels 28 abgewandten Endbereich des dritten Schenkelbereichs 86 bis zu einem dem zweiten Schenkelbereich 84 zugewandten Endbereich des dritten Schenkelbereichs 86. Befindet sich die Betätigungseinheit 20 bzw. das Übertragungselement 22 in der ersten Schaltposition, ist das Schaltmittel 36 auf der Führungsstange 94 in der dem Anschlagmittel 100 zugewandten Endposition.When the operating unit 20 is rotated from the second switching position to the first switching position along the direction of rotation 32, the transmission element 22 presses against the third leg portion 86 of the second spring leg 28 and thereby moves the switching spring 18 and together with this the switching means 36 on the guide rod 94 and the Transmission element 104 on the intermediate shaft 62 in the direction 98. During the switching operation, the transmission element 22 moves from an end portion of the third leg portion 86 facing away from the second leg portion 84 of the second spring leg 28 to an end portion of the third leg portion 86 facing the second leg portion 84 If the actuating unit 20 or the transmission element 22 in the first switching position, the switching means 36 on the guide rod 94 in the end means facing the stop means 100.

Claims (7)

  1. Portable power tool, in particular a rotary and/or demolition hammer, having an axial direction (34), a transmission housing (12) and a transmission unit (14) with a switching unit (16) which has a switching spring (18) with two spring legs (26, 28) and an actuating unit (20), fittable in the transmission housing (12), with a rotation axis (72), oriented perpendicularly to the axial direction (34), and a transmission element (22), wherein the switching spring (18) comprises a receiving region (24) which is intended to receive the transmission element (22) of the fitted actuating unit (20) when the transmission housing (12) and the transmission unit (14) are fitted, characterized in that the receiving region (24) for receiving the transmission element (22) makes it possible, when the transmission housing (12) with the transmission unit (14) is fitted in a fitting direction (30) which extends parallel to the axial direction (34), to push the transmission housing (12) relative to the transmission unit (14), with the actuating unit (20) already fitted in the transmission housing (12), onto the transmission unit (14) in that the two spring legs (26, 28) of the switching spring (18) are arranged in a manner spaced apart from one another both parallel to the rotation axis (72) of the actuating unit (20) and in a direction (74) which is oriented substantially perpendicularly to the rotation axis (72) and perpendicularly to the fitting direction (30).
  2. Portable power tool according to Claim 1, characterized in that the spring legs (26, 28) are intended, in the event of a movement of the actuating unit (20) in a rotational direction (32), for a movement of at least one switching means (36) of the transmission unit (14) in an axial direction (34).
  3. Portable power tool according to either of the preceding claims, characterized in that the switching spring (18) forms at least one energy storage means (38) in which a switching force is able to be stored.
  4. Portable power tool according to one of the preceding claims, characterized in that at least one spring leg (28) of the switching spring (18) has a switching slope (42) against which the transmission element (22) presses during at least one switching operation.
  5. Portable power tool at least according to Claim 4, characterized in that the switching slope (42) of the spring leg (28) has at least one guide surface (44) for guiding the transmission element (22).
  6. Portable power tool according to one of the preceding claims, characterized in that the two spring legs (26, 28) each have a leg region (86, 92), wherein the two leg regions (86, 92) are arranged in a plane parallel to the fitting direction (30) in a region of the transmission element (22).
  7. Portable power tool according to one of the preceding claims, characterized in that the switching spring (18) has a subregion (52) for receiving a switching means (36) of the transmission unit (14).
EP08708761.5A 2007-03-02 2008-02-07 Hand machine tool Active EP2129496B1 (en)

Applications Claiming Priority (2)

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DE102007009986A DE102007009986A1 (en) 2007-03-02 2007-03-02 Hand tool, especially a hammer drill or chisel hammer, comprises a switch spring with a receiving region for holding a transmission element of a mounted actuating unit during assembly of a gear housing and a gear unit
PCT/EP2008/051473 WO2008107256A1 (en) 2007-03-02 2008-02-07 Hand machine tool

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EP2129496A1 EP2129496A1 (en) 2009-12-09
EP2129496B1 true EP2129496B1 (en) 2016-02-03

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US (1) US8104544B2 (en)
EP (1) EP2129496B1 (en)
CN (1) CN101622104B (en)
DE (1) DE102007009986A1 (en)
WO (1) WO2008107256A1 (en)

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Publication number Publication date
WO2008107256A1 (en) 2008-09-12
CN101622104B (en) 2011-11-16
EP2129496A1 (en) 2009-12-09
DE102007009986A1 (en) 2008-09-04
US8104544B2 (en) 2012-01-31
US20100096153A1 (en) 2010-04-22
CN101622104A (en) 2010-01-06

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