EP2199028B1 - Electric hand tool, in particular hammer drill and/or demolition hammer - Google Patents

Electric hand tool, in particular hammer drill and/or demolition hammer Download PDF

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Publication number
EP2199028B1
EP2199028B1 EP09173522.5A EP09173522A EP2199028B1 EP 2199028 B1 EP2199028 B1 EP 2199028B1 EP 09173522 A EP09173522 A EP 09173522A EP 2199028 B1 EP2199028 B1 EP 2199028B1
Authority
EP
European Patent Office
Prior art keywords
bearing element
housing
hammer tube
electric power
portable electric
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.)
Not-in-force
Application number
EP09173522.5A
Other languages
German (de)
French (fr)
Other versions
EP2199028A3 (en
EP2199028A2 (en
Inventor
Kurt Sieber
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
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Publication of EP2199028A2 publication Critical patent/EP2199028A2/en
Publication of EP2199028A3 publication Critical patent/EP2199028A3/en
Application granted granted Critical
Publication of EP2199028B1 publication Critical patent/EP2199028B1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D2217/0011—Details of anvils, guide-sleeves or pistons
    • B25D2217/0019—Guide-sleeves
    • 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
    • B25D2250/065—Details regarding assembling of the tool
    • 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
    • B25D2250/331—Use of bearings
    • B25D2250/335—Supports therefor

Definitions

  • the invention relates to an electric hand tool according to the preamble of claim 1, in particular drilling and percussion hammer, with a housing and with a hammer tube, which is rotatably mounted in the housing by means of at least one bearing element.
  • the invention further relates to a method for introducing such a hammer tube in the housing of such a power hand tool.
  • Electric hand tools of the generic type are known in particular as drills and impact hammers. They have as a driven member to a hammer tube, are introduced in the pulse generating construction elements with effect on a tool holder, and wherein the hammer tube of the rotational drive of the tool holder is used and is driven for this purpose via a transmission of the electric motor.
  • Such hammer tubes are therefore rotatably mounted in a housing of the electric hand tool.
  • the radial bearing takes place here regularly via plain bearings, such a plain bearing is pressed for example in an intermediate flange, which surrounds the hammer tube at least partially and serves to accommodate the hammer tube in the bearing in the housing, and by means of a needle bearing, which is arranged in the housing.
  • the axial bearing via stops in the housing of the electric hand tool, for example in the gear housing and in the intermediate flange.
  • This storage which is customary in the prior art, is associated with a high level of component expenditure, with a tolerance chain that tends to vibrate being present due to the multiplicity of components, in particular due to axial play.
  • the assembly is complicated, since in the motor housing and / or gear housing of the intermediate flange is introduced, in the direction of the engine then working the hammer tube inserted and joined with the bearings.
  • the document GB 877,794A describes an electric hand tool with a housing and a hammer tube, which is rotatably mounted in the housing by means of a bearing element.
  • the bearing element is designed to screw into a bearing receptacle of the housing for producing a positive connection.
  • the patent GB 1,028,531 A describes a similar electric hand tool.
  • the document US 6,902,013 B2 describes an electric hand tool, which has three connectable by a bayonet lock housing parts.
  • the object of the invention is to provide a cost-effective, space-saving and low-backlash storage of the hammer tube for generic electric hand tools and to allow a simplified installation.
  • an electric hand tool for this purpose, is proposed, in particular a drilling and percussion hammer, with a housing and with a hammer tube, which is rotatably mounted in the housing by means of at least one bearing element.
  • the bearing element is held fixed by means of a rotation caused by positive engagement of the housing.
  • the fixation of the bearing element is therefore not as usual in the prior art, but by means of a positive connection, which is effected by rotation.
  • the bearing element is thus introduced into the housing in such a manner that it is loose or removable before the positive engagement occurring by rotation of the bearing element, but its installation position is fixed by means of the positive connection. It is therefore not screwed and not injected / molded, but held on the form-fitting.
  • the positive connection is formed by a bayonet connection between the bearing element and a bearing receptacle.
  • Bayonet closures as such are known, they have shape-responsive positive locking elements, which are brought by rotation of the components to be joined together in engagement and positive engagement.
  • bayonet locks are used when the components to be connected are also to be released frequently by a user, in particular in daily use of a corresponding device or a corresponding device, for example, lenses of a single-lens reflex camera, ie whenever a quick release and application on the one hand and a secure fixation on the other hand is required.
  • the bearing element is a bearing ring, which is penetrated by the hammer tube.
  • the bearing element is in this case annular, namely as a bearing ring.
  • the bearing ring is penetrated by the hammer tube, so that the bearing ring rests on the hammer tube or an outer circumferential surface of the hammer tube.
  • the bearing element is a sliding bearing element.
  • Plain bearings are inexpensive and durable in production and construction.
  • the bearing element preferably has on its outer side at least one fixing means for fixing to the housing.
  • the fixing means serves to secure the positive connection caused by rotation and thus the fixation in the mounting position intended for the bearing element.
  • the fixing agent is intended to prevent undesired loosening of the positive locking caused by rotation, for example due to vibrations during operation of the electric hand tool.
  • the fixing means is designed as a protruding fixing lug.
  • the fixing means is formed projecting over the outer contour of the bearing element, in particular in the form of a fixing lug.
  • a fixing lug can engage in recesses formed on the housing in the region of the bearing element or, for example be determined by means of another element, such as a screw.
  • the fixing means is formed integrally with the bearing element, that is not attached to this, but formed from the same material.
  • a cost-effective and rapid production in one go such as in a punching / forming process, allows.
  • the invention provides an anti-rotation between the bearing element and the housing. By preventing rotation, a relative rotation between the bearing element and the housing, thus an undesirable release of the positive connection, prevented. This ensures that the bearing element remains fixed in the housing in the intended manner. As a rotation, for example, a screw, a positive connection or any other connection comes into question, which reliably prevents twisting.
  • the housing has a transmission housing and / or an intermediate housing, wherein the bearing element is located in the transmission housing and / or in the intermediate housing.
  • the housing is subdivided with regard to the spatial allocation of different housing areas in a transmission housing, in which a transmission of the electric hand tool, for example, at least parts of a striking mechanism are arranged, an intermediate housing in which the connection to the tool holder is arranged and a motor housing in which essentially the motor of the electric hand tool is arranged, can be distinguished.
  • a transmission housing in which a transmission of the electric hand tool, for example, at least parts of a striking mechanism are arranged
  • an intermediate housing in which the connection to the tool holder is arranged
  • a motor housing in which essentially the motor of the electric hand tool is arranged
  • the housing may also consist of only one part or of two parts and, for example, not only have a transverse, but also a longitudinal division. It is essential that the bearing element is arranged in the region of the housing, in which at least substantially the transmission is located and / or in the region which serves as an intermediate housing of the connection of the transmission region to the tool holder. This arrangement makes a simple, low-cost design causes because the bearing element can be easily introduced into such areas of the housing.
  • Next is a recording of the over causes the hammer tube transmitted forces through the gear housing, which is designed to be very resilient and stable due to its design as a gear housing.
  • the gear housing is only a partial housing or, in particularly preferred embodiments, a skeleton structure, wherein the sub-housing or this skeleton structure are designed so that the force introduction and force absorption takes place in a particularly effective manner and in such a way that the structure as such absorbs the forces.
  • the housing of the electric hand tool Particularly easy and inexpensive form by the gear housing or the skeleton structure in mechanically very stable, for example, made of a metal alloy structure and the housing outer contour is represented by a low-priced and lightweight plastic cover, for example as housing half-shells or partial shells.
  • a gearbox housing training with a separate, lightweight housing cover is possible.
  • the hammer tube superimposed in only one bearing element, unlike in the prior art, in which it is stored in at least two bearing elements.
  • the hammer tube can be shortened in this embodiment and the bearing element can also be formed extended, so that there is a greater overlap of bearing element and hammer tube, as viewed on the relative length of the hammer tube.
  • the hammer tube can be very easily introduced in this way with the only one bearing element in the housing, in particular in the transmission housing.
  • a particularly simplified structure of the electric hand tool can be achieved, with the formation of substantially two blocks, one of which includes the engine and the motor housing, the other the transmission in the transmission housing with the bearing element and the hammer tube.
  • the structure of the electric hand tool, in particular the assembly is thereby greatly simplified.
  • the outer diameter of the bearing element is greater than each outer diameter of such parts associated with and / or disposed on the hammer tube, and which are arranged between the bearing element and a tool holder to be assigned or assigned hammer tube end face. This ensures that the assembly, namely an insertion in the axial direction, as described above, can be done easily and easily. At the same time a clear axial positioning of the hammer tube is achieved in the housing, as a further displacement in the axial direction in the direction of a tool holder (which is not yet arranged on the hammer tube, but there will be arranged) can be done.
  • a method for introducing a hammer tube in the housing of an electric hand tool, in particular a drill and / or percussion hammer, preferably as described above, wherein the housing has a motor area and the electric hand tool is provided with a tool holder. It is provided that the hammer tube is inserted starting from the engine area in the direction of the tool holder in the housing and then fixed by turning the bearing element. Unlike the prior art, therefore, the hammer tube is not mounted in the direction of the engine or a motor assembly, but in the opposite direction in the direction of the tool holder.
  • the hammer tube is actually inserted starting from the motor area, such that the motor is already mounted and inserted in the housing, but it can housing parts, in particular motor housing and gear housing, be present separately. It is essential that the hammer tube is inserted from the area provided for connection to the motor and inserted in the direction of the tool holder. In such an inserted position, the bearing element for the hammer tube is fixed by twisting, resulting in the above-described positive connection, using the bayonet closure described above.
  • FIG. 1 shows a hammer tube 1 with applied on its outer circumferential surface 2 bearing element 3, wherein the bearing element 3 is formed as a bearing ring 4, which is penetrated by the hammer tube 1.
  • the hammer tube 1 is inserted for its inclusion and shipment in an installed state in the axial direction 5 in a transmission housing 6, wherein the transmission housing 6 has a bearing element receptacle 7 for receiving the bearing element 3.
  • the hammer tube 1 passes through the bearing element receptacle 7 in the direction of an axial direction 5 to the bearing element receiving 7 machine neck 8, to which, viewed in the axial direction 5, a tool holder 9 connects.
  • the tool holder 9 is coupled to the hammer tube 1 and thus operatively connected in terms of rotational movement and pulse / impact action (for transmission to an insert tool, not shown).
  • the gear housing 6 is preferably made of a solid material 10, for example, a solid aluminum alloy 11. It has, formed from the material 10, the bearing element receiving 7, the radial and axial forces, as they are applied by the bearing element 3 on the bearing element receptacle 7, receives and dissipates in the transmission housing 6.
  • the gear housing 6 may have the lower side, removable housing cover 12 shown here, which in the embodiment shown here, a gearbox switch 13 for a not-shown gearbox, which is incorporated in the gear housing 6 of the electric hand tool, not shown.
  • the hammer tube 1 After introduction of the hammer tube 1 (namely insertion in the axial direction 5 until it engages in the bearing element receptacle 7), the hammer tube 1 supports exclusively via the bearing element 3 and the associated bearing element receptacle 7 in the gearbox housing 6.
  • the radial support of the hammer tube 1 takes place via the bearing element 3, which is designed as a sliding bearing 14.
  • FIG. 2 shows the hammer tube 1 immediately before reaching its installation position in the gear housing 6, wherein the tool holder 9 associated coupling piece 17 passes through the machine neck 8, and wherein the hammer tube 1 rotatably axially concentric to a rotational axis 18 of the tool holder 9 in the gear housing 6 rotatably supports.
  • the introduction of the hammer tube 1 in the bearing element receiving 7 takes place in the axial direction 5, wherein upon engagement of the bearing element 3 for locking the bayonet lock 15, a rotation 19 takes place in the circumferential direction; a rotation 19 in the opposite direction causes a loosening of the bayonet closure 15, whereby the hammer tube 1 can be easily removed again from the gear housing 6, for example, in the case of service.
  • the transmission and the impact mechanism is introduced and joined and then the unit shown of the gear housing 6 with the motor housing (not shown) and the motor introduced there to drive connected.
  • FIG. 3 shows the bearing element 3, which is designed as a self-lubricating sliding bearing 14. It consists of a suitable material for such self-lubricating bearing applications, for example, sintered bronze 20.
  • the bearing element 3 On its outer peripheral side 21, the bearing element 3 for forming the bayonet lock 15 locking webs 22 which in shape-responsive geometries of in FIGS. 1 and 2 shown bearing element receptacle 7 (see there) intervene. Due to the elongated in the circumferential direction execution of the locking webs 22 can be a relatively large-scale axial fixation of the bearing element 3 in the bearing element holder 7, not shown here cause.
  • the locking webs 22 are in this case as fixing means 23 for fixing the bearing element 3 in the in FIGS.
  • the bearing element 3 has a rotation 25, which consists of an interaction of recesses 26 in a face 27 and the outer peripheral side 21 of the bearing element 3 with engagement means, not shown.
  • the engagement means engage, in the installed state of the bearing element 3 in the bearing element receptacle 7 shown in the preceding figures, into the recesses 26 and thereby prevent a relative rotation of the bearing element 3 to the bearing element receptacle 7 shown in the preceding figures, ie an opening of the bayonet 15
  • the engagement means may in this case be formed by a screw connection, a detent or other suitable means which reliably (and in particular self-acting) engage in the recesses 26.
  • the engagement means is preferably formed by a web arranged on the housing cover 12, in particular a plastic web, which stops, for example, during the production process of the housing cover 12.

Description

Die Erfindung betrifft ein Elektrohandwerkzeug gemäß dem Oberbegriff des Anspruchs 1, insbesondere Bohr- und Schlaghammer, mit einem Gehäuse und mit einem Hammerrohr, das drehbar im Gehäuse mittels mindestens eines Lagerelements gelagert ist. Die Erfindung betrifft ferner ein Verfahren zum Einbringen eines solchen Hammerrohrs in das Gehäuse eines solchen Elektrohandwerkzeugs.The invention relates to an electric hand tool according to the preamble of claim 1, in particular drilling and percussion hammer, with a housing and with a hammer tube, which is rotatably mounted in the housing by means of at least one bearing element. The invention further relates to a method for introducing such a hammer tube in the housing of such a power hand tool.

Ein solches Elektrohandwerkzeug und ein solches Verfahren sind aus der GB 877 794 A1 bekannt.Such an electric hand tool and such a method are known from GB 877 794 A1 known.

Stand der TechnikState of the art

Elektrohandwerkzeuge der gattungsgemäßen Art sind insbesondere als Bohr- und Schlaghämmer bekannt. Sie weisen als Abtriebsglied ein Hammerrohr auf, in dem impulserzeugende Konstruktionselemente mit Wirkung auf eine Werkzeugaufnahme eingebracht sind, und wobei das Hammerrohr der Drehmitnahme der Werkzeugaufnahme dient und zu diesem Zweck über ein Getriebe von dem Elektromotor angetrieben wird. Derartige Hammerrohre sind daher in einem Gehäuse des Elektrohandwerkzeugs drehbar gelagert. Die radiale Lagerung erfolgt hierbei regelmäßig über Gleitlager, wobei ein solches Gleitlager beispielsweise in einen Zwischenflansch eingepresst ist, der das Hammerrohr zumindest bereichsweise umgibt und der Aufnahme des Hammerrohrs im Bereich der Lagerstelle im Gehäuse dient, sowie mittels eines Nadellagers, das im Gehäuse angeordnet ist. Die Axiallagerung erfolgt über Anschläge im Gehäuse des Elektrohandwerkzeugs, beispielsweise im Getriebegehäuse und im Zwischenflansch. Diese im Stand der Technik übliche Lagerung ist mit einem hohen Bauteileaufwand verbunden, wobei durch die Vielzahl der Bauteile insbesondere durch Axialspiel eine zur Vibration neigende Toleranzkette besteht.Electric hand tools of the generic type are known in particular as drills and impact hammers. They have as a driven member to a hammer tube, are introduced in the pulse generating construction elements with effect on a tool holder, and wherein the hammer tube of the rotational drive of the tool holder is used and is driven for this purpose via a transmission of the electric motor. Such hammer tubes are therefore rotatably mounted in a housing of the electric hand tool. The radial bearing takes place here regularly via plain bearings, such a plain bearing is pressed for example in an intermediate flange, which surrounds the hammer tube at least partially and serves to accommodate the hammer tube in the bearing in the housing, and by means of a needle bearing, which is arranged in the housing. The axial bearing via stops in the housing of the electric hand tool, for example in the gear housing and in the intermediate flange. This storage, which is customary in the prior art, is associated with a high level of component expenditure, with a tolerance chain that tends to vibrate being present due to the multiplicity of components, in particular due to axial play.

Überdies ist die Montage aufwendig, da in das Motorgehäuse und/oder Getriebegehäuse der Zwischenflansch eingebracht wird, in Richtung auf den Motor hinarbeitend sodann das Hammerrohr eingefügt und mit den Lagerstellen gefügt wird.Moreover, the assembly is complicated, since in the motor housing and / or gear housing of the intermediate flange is introduced, in the direction of the engine then working the hammer tube inserted and joined with the bearings.

Das Dokument GB 877,794 A beschreibt ein Elektrohandwerkzeug mit einem Gehäuse und einem Hammerrohr, das drehbar in dem Gehäuse mittels eines Lagerelements gelagert ist. Das Lagerelement ist dabei zur Herstellung eines Formschlusses in eine Lageraufnahme des Gehäuses einschraubbar ausgebildet. Die Patentschrift GB 1,028,531 A beschreibt ein ähnliches Elektrohandwerkzeug. Das Dokument US 6,902,013 B2 beschreibt ein Elektrohandwerkzeug, welches drei miteinander durch einen Bajonettverschluss verbindbare Gehäuseteile aufweist.The document GB 877,794A describes an electric hand tool with a housing and a hammer tube, which is rotatably mounted in the housing by means of a bearing element. The bearing element is designed to screw into a bearing receptacle of the housing for producing a positive connection. The patent GB 1,028,531 A describes a similar electric hand tool. The document US 6,902,013 B2 describes an electric hand tool, which has three connectable by a bayonet lock housing parts.

Aufgabe der Erfindung ist es, eine kostengünstige, platzsparende und spielarme Lagerung des Hammerrohrs für gattungsgemäße Elektrohandwerkzeuge bereitzustellen sowie eine vereinfachte Montage zu ermöglichen.The object of the invention is to provide a cost-effective, space-saving and low-backlash storage of the hammer tube for generic electric hand tools and to allow a simplified installation.

Offenbarung der ErfindungDisclosure of the invention

Hierzu wird ein Elektrohandwerkzeug gemäß dem Anspruch 1 vorgeschlagen, insbesondere ein Bohr- und Schlaghammer, mit einem Gehäuse und mit einem Hammerrohr, das drehbar im Gehäuse mittels mindestens eines Lagerelements gelagert ist. Es ist vorgesehen, dass das Lagerelement mittels eines durch Drehung bewirkten Formschlusses am Gehäuse fixiert gehalten ist. Die Fixierung des Lagerelements erfolgt demzufolge nicht wie im Stand der Technik üblich, sondern mittels eines Formschlusses, der durch Drehung bewirkt wird. Das Lagerelement wird demzufolge in einer solchen Art und Weise in das Gehäuse eingebracht, dass es vor dem durch Drehung des Lagerelements eintretenden Formschluss lose beziehungsweise entnehmbar ist, seine Einbauposition aber mittels des Formschlusses fixiert wird. Es ist demzufolge nicht eingeschraubt und nicht eingespritzt/umspritzt, sondern über den Formschluss gehalten. Erfindungsgemäß ist der Formschluss von einem Bajonettverschluss zwischen dem Lagerelement und einer Lageraufnahme gebildet. Bajonettverschlüsse als solche sind bekannt, sie weisen formentsprechende Formschlusselemente auf, die durch Verdrehung der miteinander zu verbindenden Bauteile in Eingriff und Formschluss gebracht werden. Üblicherweise werden derartige Bajonettverschlüsse verwendet, wenn die zu verbindenden Bauteile von einem Benutzer auch häufig gelöst werden sollen, insbesondere im täglichen Gebrauch eines entsprechenden Geräts oder einer entsprechenden Vorrichtung, beispielsweise Objektive einer Spiegelreflexkamera, also immer dann, wenn ein schnelles Lösen und Aufbringen einerseits und eine sichere Fixierung andererseits gefordert ist.For this purpose, an electric hand tool according to claim 1 is proposed, in particular a drilling and percussion hammer, with a housing and with a hammer tube, which is rotatably mounted in the housing by means of at least one bearing element. It is provided that the bearing element is held fixed by means of a rotation caused by positive engagement of the housing. The fixation of the bearing element is therefore not as usual in the prior art, but by means of a positive connection, which is effected by rotation. The bearing element is thus introduced into the housing in such a manner that it is loose or removable before the positive engagement occurring by rotation of the bearing element, but its installation position is fixed by means of the positive connection. It is therefore not screwed and not injected / molded, but held on the form-fitting. According to the invention, the positive connection is formed by a bayonet connection between the bearing element and a bearing receptacle. Bayonet closures as such are known, they have shape-responsive positive locking elements, which are brought by rotation of the components to be joined together in engagement and positive engagement. Usually, such bayonet locks are used when the components to be connected are also to be released frequently by a user, in particular in daily use of a corresponding device or a corresponding device, for example, lenses of a single-lens reflex camera, ie whenever a quick release and application on the one hand and a secure fixation on the other hand is required.

In einer bevorzugten Ausführungsform ist das Lagerelement ein Lagerring, der vom Hammerrohr durchgriffen ist. Das Lagerelement ist hierbei ringförmig ausgebildet, nämlich als Lagerring. Der Lagerring wird vom Hammerrohr durchgriffen, sodass der Lagerring auf dem Hammerrohr beziehungsweise einer Außenmantelfläche des Hammerrohrs ruht.In a preferred embodiment, the bearing element is a bearing ring, which is penetrated by the hammer tube. The bearing element is in this case annular, namely as a bearing ring. The bearing ring is penetrated by the hammer tube, so that the bearing ring rests on the hammer tube or an outer circumferential surface of the hammer tube.

Bevorzugt ist das Lagerelement ein Gleitlagerelement. Gleitlager sind in der Herstellung und Konstruktion günstig und dauerhaft betriebssicher. Insbesondere ist es möglich, Gleitlager nach den entsprechenden Anwendungsbereichen genau zu spezifizieren und in einer solchen Art und Weise auszubilden, beispielsweise mittels ölgetränkter Sinterbronze, dass sie die durchschnittliche Lebensdauer eines Elektrohandwerkzeugs sicher erreichen oder ihre Lebensdauer deutlich höher ist als die des gattungsgemäßen Elektrohandwerkzeugs. Sie sind in vorteilhafter Weise wartungsfrei.Preferably, the bearing element is a sliding bearing element. Plain bearings are inexpensive and durable in production and construction. In particular, it is possible to precisely specify sliding bearings according to the respective fields of application and to form them in such a way, for example by means of oil-impregnated sintered bronze that they reach the average life of an electric hand tool safely or their life is significantly higher than that of the generic electric hand tool. They are advantageously maintenance-free.

In einer weiteren Ausführungsform weist das Lagerelement vorzugsweise an seiner Außenseite mindestens ein Fixiermittel zur Fixierung am Gehäuse auf. Das Fixiermittel dient dazu, den durch Drehung bewirkten Formschluss und damit die Fixierung in der dem Lagerelement zugedachten Einbaulage zu sichern. Durch das Fixiermittel soll verhindert werden, dass sich der durch Drehung bewirkte Formschluss, beispielsweise durch Vibrationen im Betrieb des Elektrohandwerkzeugs, unerwünscht lösen kann. Als Fixiermittel kommen sämtliche im Stand der Technik bekannten Fixiermöglichkeiten in Betracht, insbesondere Verschraubungen, beispielsweise solche, die radial auf das Lagerelement einwirken, insbesondere auch im Bereich des Formschlusses.In a further embodiment, the bearing element preferably has on its outer side at least one fixing means for fixing to the housing. The fixing means serves to secure the positive connection caused by rotation and thus the fixation in the mounting position intended for the bearing element. The fixing agent is intended to prevent undesired loosening of the positive locking caused by rotation, for example due to vibrations during operation of the electric hand tool. As fixing all known in the prior art fixing options into consideration, in particular glands, for example, those which act radially on the bearing element, in particular in the field of positive engagement.

In einer weiteren bevorzugten Ausführungsform ist das Fixiermittel als vorstehende Fixiernase ausgebildet. Damit ist gemeint, dass das Fixiermittel über die Außenkontur des Lagerelements hervorstehend ausgebildet ist, insbesondere nämlich in Form einer Fixiernase. Eine solche Fixiernase kann in am Gehäuse im Bereich des Lagerelements ausgebildete Ausnehmungen eingreifen oder beispielsweise mittels eines weiteren Elements, etwa einer Verschraubung, festgelegt werden.In a further preferred embodiment, the fixing means is designed as a protruding fixing lug. By this is meant that the fixing means is formed projecting over the outer contour of the bearing element, in particular in the form of a fixing lug. Such a fixing lug can engage in recesses formed on the housing in the region of the bearing element or, for example be determined by means of another element, such as a screw.

Bevorzugt ist das Fixiermittel einstückig mit dem Lagerelement ausgebildet, also nicht an diesem befestigt, sondern aus demselben Material ausgeformt. Hierdurch wird eine kostengünstige und schnelle Herstellung in einem Zuge, etwa in einem Stanz-/Umformvorgang, ermöglicht.Preferably, the fixing means is formed integrally with the bearing element, that is not attached to this, but formed from the same material. As a result, a cost-effective and rapid production in one go, such as in a punching / forming process, allows.

Die Erfindung sieht eine Verdrehsicherung zwischen Lagerelement und Gehäuse vor. Durch die Verdrehsicherung wird eine Relativdrehung zwischen Lagerelement und Gehäuse, mithin ein unerwünschtes Lösen des Formschlusses, verhindert. Hierdurch wird sichergestellt, dass das Lagerelement im Gehäuse in der vorgesehenen Weise fixiert bleibt. Als Verdrehsicherung kommt beispielsweise eine Verschraubung, eine formschlüssige Verbindung oder jede andere Verbindung in Betracht, die zuverlässig ein Verdrehen verhindert.The invention provides an anti-rotation between the bearing element and the housing. By preventing rotation, a relative rotation between the bearing element and the housing, thus an undesirable release of the positive connection, prevented. This ensures that the bearing element remains fixed in the housing in the intended manner. As a rotation, for example, a screw, a positive connection or any other connection comes into question, which reliably prevents twisting.

In einer weiteren Ausführungsform weist das Gehäuse ein Getriebegehäuse und/oder ein Zwischengehäuse auf, wobei sich das Lagerelement im Getriebegehäuse und/oder im Zwischengehäuse befindet. Das Gehäuse ist in Hinblick auf die räumliche Zuordnung verschiedener Gehäusebereiche unterteilbar in ein Getriebegehäuse, in dem im Wesentlichen ein Getriebe des Elektrohandwerkzeugs, beispielsweise auch zumindest Teile eines Schlagwerkes, angeordnet sind, ein Zwischengehäuse, in dem die Anbindung an die Werkzeugaufnahme angeordnet ist und ein Motorgehäuse, in dem im Wesentlichen der Motor des Elektrohandwerkzeugs angeordnet ist, unterschieden werden. Hierbei ist nicht erforderlich, dass das Gehäuse rein physisch/mechanisch in verschiedene Gehäuseabschnitte trennbar oder aus verschiedenen Abschnitten gebildet ist, maßgeblich ist allein die entsprechende Zuordnung zur jeweiligen funktionalen Einheit. Insbesondere kann das Gehäuse auch aus nur einem Teil oder aus zwei Teilen bestehen und beispielsweise nicht nur eine Quer-, sondern auch eine Längsteilung aufweisen. Wesentlich ist, dass das Lagerelement in dem Bereich des Gehäuses angeordnet ist, in dem sich zumindest im Wesentlichen das Getriebe befindet und/oder in dem Bereich, das als Zwischengehäuse der Anbindung des Getriebebereichs an die Werkzeugaufnahme dient. Durch diese Anordnung wird eine einfache,
kostengünstige Ausführung bewirkt, da das Lagerelement in solche Bereiche des Gehäuses leicht eingebracht werden kann. Weiter wird eine Aufnahme der über das Hammerrohr übertragenen Kräfte durch das Getriebegehäuse bewirkt, das aufgrund seiner Bauweise als Getriebegehäuse sehr belastbar und stabil ausgebildet ist. Insbesondere ist hierbei auch denkbar, dass das Getriebegehäuse nur ein Teilgehäuse oder, in besonders bevorzugten Ausführungsformen, eine Skelettstruktur ist, wobei das Teilgehäuse beziehungsweise diese Skelettstruktur so ausgeführt sind, dass die Krafteinleitung und Kraftaufnahme in besonders wirksamer Weise und dergestalt erfolgt, dass die Struktur als solche die Kräfte aufnimmt. Hierdurch ist es beispielsweise möglich, das Gehäuse des Elektrohandwerkzeugs besonders leicht und kostengünstig auszubilden, indem das Getriebeteilgehäuse beziehungsweise die Skelettstruktur in mechanisch sehr stabiler, beispielsweise aus einer Metalllegierung bestehenden Struktur ausgeführt und die Gehäuseaußenkontur durch eine preisgünstige und leichtgewichtige Kunststoffabdeckung, beispielsweise als Gehäusehalbschalen oder Teilschalen, dargestellt wird. Insbesondere ist in der Darstellung als Getriebeteilgehäuse die Ausbildung mit einem gesonderten, leichten Gehäusedeckel möglich.In a further embodiment, the housing has a transmission housing and / or an intermediate housing, wherein the bearing element is located in the transmission housing and / or in the intermediate housing. The housing is subdivided with regard to the spatial allocation of different housing areas in a transmission housing, in which a transmission of the electric hand tool, for example, at least parts of a striking mechanism are arranged, an intermediate housing in which the connection to the tool holder is arranged and a motor housing in which essentially the motor of the electric hand tool is arranged, can be distinguished. In this case, it is not necessary for the housing to be separable purely physically / mechanically into different housing sections or to be formed from different sections; only the corresponding assignment to the respective functional unit is decisive. In particular, the housing may also consist of only one part or of two parts and, for example, not only have a transverse, but also a longitudinal division. It is essential that the bearing element is arranged in the region of the housing, in which at least substantially the transmission is located and / or in the region which serves as an intermediate housing of the connection of the transmission region to the tool holder. This arrangement makes a simple,
low-cost design causes because the bearing element can be easily introduced into such areas of the housing. Next is a recording of the over causes the hammer tube transmitted forces through the gear housing, which is designed to be very resilient and stable due to its design as a gear housing. In particular, this is also conceivable that the gear housing is only a partial housing or, in particularly preferred embodiments, a skeleton structure, wherein the sub-housing or this skeleton structure are designed so that the force introduction and force absorption takes place in a particularly effective manner and in such a way that the structure as such absorbs the forces. This makes it possible, for example, the housing of the electric hand tool Particularly easy and inexpensive form by the gear housing or the skeleton structure in mechanically very stable, for example, made of a metal alloy structure and the housing outer contour is represented by a low-priced and lightweight plastic cover, for example as housing half-shells or partial shells. In particular, in the presentation as a gearbox housing training with a separate, lightweight housing cover is possible.

In einer besonders bevorzugten Ausführungsform lagert das Hammerrohr in nur einem Lagerelement, anders als im Stand der Technik, in dem es in mindestens zwei Lagerelementen lagert. Das Hammerrohr kann in dieser Ausführungsform verkürzt und das Lagerelement auch verlängert ausgebildet werden, so dass eine größere Überdeckung von Lagerelement und Hammerrohr, betrachtet auf die relative Länge des Hammerrohrs, besteht. Das Hammerrohr lässt sich in dieser Weise sehr einfach mit dem nur einen Lagerelement in das Gehäuse einbringen, insbesondere in das Getriebegehäuse. Bei einer solchen Anbringung des nur einen Lagerelements im Getriebegehäuse lässt sich ein besonders vereinfachter Aufbau des Elektrohandwerkzeugs erreichen, mit der Ausbildung von im Wesentlichen zwei Blöcken, von denen einer den Motor und das Motorgehäuse umfasst, der andere das Getriebe im Getriebegehäuse mit dem Lagerelement und dem Hammerrohr. Der Aufbau des Elektrohandwerkzeugs, insbesondere die Montage, wird hierdurch stark vereinfacht.In a particularly preferred embodiment, the hammer tube superimposed in only one bearing element, unlike in the prior art, in which it is stored in at least two bearing elements. The hammer tube can be shortened in this embodiment and the bearing element can also be formed extended, so that there is a greater overlap of bearing element and hammer tube, as viewed on the relative length of the hammer tube. The hammer tube can be very easily introduced in this way with the only one bearing element in the housing, in particular in the transmission housing. In such a mounting of the only one bearing element in the gear housing, a particularly simplified structure of the electric hand tool can be achieved, with the formation of substantially two blocks, one of which includes the engine and the motor housing, the other the transmission in the transmission housing with the bearing element and the hammer tube. The structure of the electric hand tool, in particular the assembly, is thereby greatly simplified.

In einer bevorzugten Ausführungsform ist der Außendurchmesser des Lagerelements größer als jeder Außendurchmesser von solchen Teilen, die dem Hammerrohr zugeordnet und/oder auf diesem angeordnet sind, und die zwischen dem Lagerelement und einer einer Werkzeugaufnahme zuzuordnenden oder zugeordneten Hammerrohrstirnseite angeordnet sind. Hierdurch wird sichergestellt, dass die Montage, nämlich ein Einschub in Axialrichtung, wie vorstehend beschrieben, einfach und problemlos erfolgen kann. Gleichzeitig wird dadurch eine eindeutige Axialpositionierung des Hammerrohrs im Gehäuse erzielt, da ein weiteres Verschieben in Axialrichtung in Richtung auf eine Werkzeugaufnahme (die hier noch nicht am Hammerrohr angeordnet ist, aber dort angeordnet werden wird) erfolgen kann.In a preferred embodiment, the outer diameter of the bearing element is greater than each outer diameter of such parts associated with and / or disposed on the hammer tube, and which are arranged between the bearing element and a tool holder to be assigned or assigned hammer tube end face. This ensures that the assembly, namely an insertion in the axial direction, as described above, can be done easily and easily. At the same time a clear axial positioning of the hammer tube is achieved in the housing, as a further displacement in the axial direction in the direction of a tool holder (which is not yet arranged on the hammer tube, but there will be arranged) can be done.

Weiter wird ein Verfahren vorgeschlagen zum Einbringen eines Hammerrohrs in das Gehäuse eines Elektrohandwerkzeugs, insbesondere eines Bohr- und/oder Schlaghammers, vorzugweise wie vorstehend beschrieben, wobei das Gehäuse einen Motorbereich aufweist und das Elektrohandwerkzeug mit einer Werkzeugaufnahme versehen ist. Dabei ist vorgesehen, dass das Hammerrohr vom Motorbereich ausgehend in Richtung auf die Werkzeugaufnahme in das Gehäuse eingeschoben und anschließend durch Verdrehen des Lagerelements festgelegt wird. Anders als im Stand der Technik wird also nicht das Hammerrohr in Richtung auf den Motor oder eine Motorbaugruppe hin montiert, sondern in umgekehrter Richtung in Richtung auf die Werkzeugaufnahme hin. Selbstverständlich ist dabei nicht erforderlich, dass das Hammerrohr tatsächlich vom Motorbereich ausgehend eingeschoben wird, dergestalt, dass der Motor bereits montiert und im Gehäuse eingefügt ist, es können vielmehr Gehäuseteile, insbesondere Motorgehäuse und Getriebegehäuse, getrennt vorliegen. Wesentlich ist, dass das Hammerrohr von dem zum Anschluss an den Motor vorgesehenen Bereich eingeführt und in Richtung auf die Werkzeugaufnahme hin eingeschoben wird. In einer solchen eingeschobenen Lage wird das Lagerelement für das Hammerrohr durch Verdrehen festgelegt, wodurch sich der vorstehend beschriebene Formschluss ergibt, unter Verwendung des vorstehend beschriebenen Bajonettverschlusses.Further, a method is proposed for introducing a hammer tube in the housing of an electric hand tool, in particular a drill and / or percussion hammer, preferably as described above, wherein the housing has a motor area and the electric hand tool is provided with a tool holder. It is provided that the hammer tube is inserted starting from the engine area in the direction of the tool holder in the housing and then fixed by turning the bearing element. Unlike the prior art, therefore, the hammer tube is not mounted in the direction of the engine or a motor assembly, but in the opposite direction in the direction of the tool holder. Of course, it is not necessary that the hammer tube is actually inserted starting from the motor area, such that the motor is already mounted and inserted in the housing, but it can housing parts, in particular motor housing and gear housing, be present separately. It is essential that the hammer tube is inserted from the area provided for connection to the motor and inserted in the direction of the tool holder. In such an inserted position, the bearing element for the hammer tube is fixed by twisting, resulting in the above-described positive connection, using the bayonet closure described above.

Weitere vorteilhafte Ausführungsformen ergeben sich aus den Unteransprüchen und aus Kombinationen derselben.Further advantageous embodiments will become apparent from the dependent claims and combinations thereof.

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen näher beschrieben, ohne aber hierauf beschränkt zu sein.The invention will be described in more detail below with reference to embodiments, but without being limited thereto.

Es zeigen

Figur 1
ein Getriebegehäuse eines Elektrohandwerkzeugs mit einem einzubringenden Hammerrohr;
Figur 2
das Getriebegehäuse mit eingebrachtem und mittels Formschluss gehaltenen Lagerelement und
Figur 3
das Lagerelement.
Show it
FIG. 1
a gear housing of an electric hand tool with a hammer tube to be inserted;
FIG. 2
the gear housing with incorporated and held by positive locking bearing element and
FIG. 3
the bearing element.

Figur 1 zeigt ein Hammerrohr 1 mit auf seiner Außenmantelfläche 2 aufgebrachtem Lagerelement 3, wobei das Lagerelement 3 als Lagerring 4 ausgebildet ist, der von dem Hammerrohr 1 durchgriffen wird. Das Hammerrohr 1 wird zu seiner Aufnahme und Verbringung in einen Einbauzustand in Axialrichtung 5 in ein Getriebegehäuse 6 eingeschoben, wobei das Getriebegehäuse 6 eine Lagerelementaufnahme 7 zur Aufnahme des Lagerelements 3 aufweist. Bei Einschieben in Axialrichtung 5 durchgreift das Hammerrohr 1 die Lagerelementaufnahme 7 in Richtung auf einen in Axialrichtung 5 nach der Lagerelementaufnahme 7 befindlichen Maschinenhals 8, an den sich, in Axialrichtung 5 betrachtet, eine Werkzeugaufnahme 9 anschließt. Die Werkzeugaufnahme 9 wird mit dem Hammerrohr 1 gekuppelt und damit hinsichtlich Drehbewegung und Impuls-/Schlagwirkung (zur Übertragung auf ein nicht dargestelltes Einsatzwerkzeug) wirkverbunden. Das Getriebegehäuse 6 besteht vorzugsweise aus einem festen Material 10, beispielsweise aus einer festen Aluminiumlegierung 11. Es weist, aus dem Material 10 gebildet, die Lagerelementaufnahme 7 auf, die Radial- und Axialkräfte, wie sie vom Lagerelement 3 auf die Lagerelementaufnahme 7 aufgebracht werden, aufnimmt und in das Getriebegehäuse 6 ableitet. Zur Vereinfachung der Montage und der Wartung kann das Getriebegehäuse 6 den hier dargestellten unterseitigen, abnehmbaren Gehäusedeckel 12 aufweisen, der in der hier gezeigten Ausführungsform ein Getriebeumschalter 13 für ein hier nicht dargestelltes Getriebe, das im Getriebegehäuse 6 des nicht dargestellten Elektrohandwerkzeugs eingebracht ist, aufweist. FIG. 1 shows a hammer tube 1 with applied on its outer circumferential surface 2 bearing element 3, wherein the bearing element 3 is formed as a bearing ring 4, which is penetrated by the hammer tube 1. The hammer tube 1 is inserted for its inclusion and shipment in an installed state in the axial direction 5 in a transmission housing 6, wherein the transmission housing 6 has a bearing element receptacle 7 for receiving the bearing element 3. When inserted in the axial direction 5, the hammer tube 1 passes through the bearing element receptacle 7 in the direction of an axial direction 5 to the bearing element receiving 7 machine neck 8, to which, viewed in the axial direction 5, a tool holder 9 connects. The tool holder 9 is coupled to the hammer tube 1 and thus operatively connected in terms of rotational movement and pulse / impact action (for transmission to an insert tool, not shown). The gear housing 6 is preferably made of a solid material 10, for example, a solid aluminum alloy 11. It has, formed from the material 10, the bearing element receiving 7, the radial and axial forces, as they are applied by the bearing element 3 on the bearing element receptacle 7, receives and dissipates in the transmission housing 6. To simplify installation and maintenance, the gear housing 6 may have the lower side, removable housing cover 12 shown here, which in the embodiment shown here, a gearbox switch 13 for a not-shown gearbox, which is incorporated in the gear housing 6 of the electric hand tool, not shown.

Nach Einbringen des Hammerohrs 1 (nämlich Einschieben in Axialrichtung 5 bis zum Eingreifen in die Lagerelementaufnahme 7) lagert das Hammerrohr 1 ausschließlich über das Lagerelement 3 und die zugehörige Lagerelementaufnahme 7 im Getriebegehäuse 6. Die radiale Abstützung des Hammerrohrs 1 erfolgt hierbei über das Lagerelement 3, das als Gleitlager 14 ausgebildet ist. Die Axialfixierung des Hammerrohrs 1 erfolgt über eine Fixierung des Lagerelements 3 in der Lagerelementaufnahme 7 mittels eines durch Drehung bewirkten Formschlusses zwischen dem Lagerelement 3 und der Lagerelementaufnahme 7, nämlich durch die Ausbildung als Bajonettverschluss 15. Hierzu sind innenumfangsseitig der Lagerelementaufnahme 7 und außenumfangsseitig des Lagerelements 3 formentsprechende Geometrien angebracht, wie weiter unten beschrieben. In dieser Art und Weise lässt sich mit nur einer Lagerung, nämlich mittels des Lagerelements 3, das Hammerrohr 1 im Getriebegehäuse 6 fixieren. Insbesondere lässt sich ein sehr leichter Aufbau realisieren, indem das Hammerrohr 1, wie gezeigt, von einer (nicht dargestellten) Motorseite des nicht dargestellten Elektrohandwerkzeugs her eingeschoben wird, also von einer Anschlussstelle 16 des Getriebegehäuses 6 an ein nicht dargestelltes Motorgehäuse. In einem solchen Fertigungsstadium kann das Hammerrohr 1 sehr leicht in seine Einbaulage verbracht und dort über den Bajonettverschluss 15 fixiert werden.After introduction of the hammer tube 1 (namely insertion in the axial direction 5 until it engages in the bearing element receptacle 7), the hammer tube 1 supports exclusively via the bearing element 3 and the associated bearing element receptacle 7 in the gearbox housing 6. The radial support of the hammer tube 1 takes place via the bearing element 3, which is designed as a sliding bearing 14. The axial fixation of the hammer tube 1 via a fixation of the bearing element 3 in the bearing element holder 7 by means of a rotation effected by positive engagement between the bearing element 3 and the bearing element receptacle 7, namely by training as a bayonet 15. For this purpose are the inner peripheral side of the bearing element receptacle 7 and the outer peripheral side of the bearing element. 3 appropriate geometry attached, as described below. In this way can be with only one storage, namely by means of the bearing element 3, fix the hammer tube 1 in the transmission housing 6. In particular, a very simple structure can be realized by the hammer tube 1, as shown, is inserted from a (not shown) motor side of the electric hand tool, not shown, ie from a connection point 16 of the gear housing 6 to a not shown motor housing. In such a production stage, the hammer tube 1 can be very easily spent in its installed position and fixed there via the bayonet 15.

Figur 2 zeigt das Hammerohr 1 unmittelbar vor Erreichen seiner Einbaulage im Getriebegehäuse 6, wobei ein der Werkzeugaufnahme 9 zugeordnetes Kuppelstück 17 den Maschinenhals 8 durchgreift, und wobei das Hammerrohr 1 axial konzentrisch zu einer Drehachse 18 der Werkzeugaufnahme 9 im Getriebegehäuse 6 drehbar lagert. Die Einbringung des Hammerrohrs 1 in die Lagerelementaufnahme 7 erfolgt in Axialrichtung 5, wobei bei Eingreifen des Lagerelements 3 zur Verriegelung des Bajonettverschlusses 15 eine Drehung 19 in Umfangsrichtung erfolgt; eine Drehung 19 in entgegengesetzter Richtung bewirkt ein Lösen des Bajonettverschlusses 15, wodurch das Hammerrohr 1 leicht wieder aus dem Getriebegehäuse 6 entnommen werden kann, beispielsweise im Servicefall. Nach Einbringen des Hammerrohrs 1 in das Getriebegehäuse 6, wie hier dargestellt, wird das Getriebe sowie die Schlagmechanik eingebracht und gefügt und sodann die gezeigte Einheit des Getriebegehäuses 6 mit dem Motorgehäuse (nicht dargestellt) und dem dort eingebrachten Motor zum Antrieb verbunden. FIG. 2 shows the hammer tube 1 immediately before reaching its installation position in the gear housing 6, wherein the tool holder 9 associated coupling piece 17 passes through the machine neck 8, and wherein the hammer tube 1 rotatably axially concentric to a rotational axis 18 of the tool holder 9 in the gear housing 6 rotatably supports. The introduction of the hammer tube 1 in the bearing element receiving 7 takes place in the axial direction 5, wherein upon engagement of the bearing element 3 for locking the bayonet lock 15, a rotation 19 takes place in the circumferential direction; a rotation 19 in the opposite direction causes a loosening of the bayonet closure 15, whereby the hammer tube 1 can be easily removed again from the gear housing 6, for example, in the case of service. After introduction of the hammer tube 1 in the gear housing 6, as shown here, the transmission and the impact mechanism is introduced and joined and then the unit shown of the gear housing 6 with the motor housing (not shown) and the motor introduced there to drive connected.

Figur 3 zeigt das Lagerelement 3, das als selbstschmierendes Gleitlager 14 ausgebildet ist. Es besteht aus einem für derartige selbstschmierende Lageranwendungen geeigneten Material, beispielsweise aus Sinterbronze 20. An seiner Außenumfangsseite 21 weist das Lagerelement 3 zur Ausbildung des Bajonettverschlusses 15 Arretierstege 22 auf, die in formentsprechende Geometrien der in Figuren 1 und 2 dargestellten Lagerelementaufnahme 7 (siehe dort) eingreifen. Durch die in Umfangsrichtung länglich erstreckte Ausführung der Arretierstege 22 lässt sich eine relativ großflächige Axialfixierung des Lagerelements 3 in der hier nicht dargestellten Lagerelementaufnahme 7 bewirken. Die Arretierstege 22 sind hierbei als Fixiermittel 23 zur Fixierung des Lagerelements 3 in der in Figuren 1 und 2 dargestellten Lagerelementaufnahme 7 ausgebildet, insbesondere als über die Außenumfangsseite 21 hervorstehende Fixiernasen 24. Zur Festlegung des Lagerelements im Bajonettverschluss 15 im in die Lagerelementaufnahme 7 eingebrachtem Zustand weist das Lagerelement 3 eine Verdrehsicherung 25 auf, die in einem Zusammenspiel aus Ausnehmungen 26 in einer Stirnseite 27 sowie der Außenumfangsseite 21 des Lagerelements 3 mit nicht dargestellten Eingriffsmitteln besteht. Die nicht dargestellten Eingriffsmittel greifen, im eingebauten Zustand des Lagerelements 3 in der in den vorhergehenden Figuren dargestellten Lagerelementaufnahme 7, in die Ausnehmungen 26 ein und verhindern dadurch eine Relativdrehung des Lagerelements 3 zur in den vorhergehenden Figuren dargestellten Lagerelementaufnahme 7, also ein Öffnen des Bajonettverschlusses 15. Die Eingriffsmittel können hierbei durch eine Verschraubung, eine Rastung oder andere geeignete Mittel gebildet sein, die zuverlässig (und insbesondere selbstwirkend) in die Ausnehmungen 26 eingreifen. Bevorzugt wird das Eingriffsmittel von einem an dem Gehäusedeckel 12 innenseitig angeordneten Steg, insbesondere Kunststoffsteg, gebildet, der beispielsweise beim Fertigungsprozess des Gehäusedeckels 12 stehen bleibt. FIG. 3 shows the bearing element 3, which is designed as a self-lubricating sliding bearing 14. It consists of a suitable material for such self-lubricating bearing applications, for example, sintered bronze 20. On its outer peripheral side 21, the bearing element 3 for forming the bayonet lock 15 locking webs 22 which in shape-responsive geometries of in FIGS. 1 and 2 shown bearing element receptacle 7 (see there) intervene. Due to the elongated in the circumferential direction execution of the locking webs 22 can be a relatively large-scale axial fixation of the bearing element 3 in the bearing element holder 7, not shown here cause. The locking webs 22 are in this case as fixing means 23 for fixing the bearing element 3 in the in FIGS. 1 and 2 formed Lagerelementaufnahme 7, in particular as over the outer peripheral side 21 protruding fixing tabs 24. To determine the Bearing element in the bayonet 15 in the introduced into the bearing element receiving 7 state, the bearing element 3 has a rotation 25, which consists of an interaction of recesses 26 in a face 27 and the outer peripheral side 21 of the bearing element 3 with engagement means, not shown. The engagement means, not shown, engage, in the installed state of the bearing element 3 in the bearing element receptacle 7 shown in the preceding figures, into the recesses 26 and thereby prevent a relative rotation of the bearing element 3 to the bearing element receptacle 7 shown in the preceding figures, ie an opening of the bayonet 15 The engagement means may in this case be formed by a screw connection, a detent or other suitable means which reliably (and in particular self-acting) engage in the recesses 26. The engagement means is preferably formed by a web arranged on the housing cover 12, in particular a plastic web, which stops, for example, during the production process of the housing cover 12.

Claims (11)

  1. Portable electric power tool, in particular hammer drill and demolition hammer, with a housing and with a hammer tube (1) which is mounted rotatably in the housing by means of at least one bearing element (3), wherein the bearing element (3) is held in a manner fixed on the housing by means of a form fit brought about by rotation (19), characterized in that the form fit is formed by a bayonet closure (15) between the bearing element (3) and a bearing element receptacle (7) of the housing, wherein the bearing element (3) has a rotation lock (25), wherein the rotation lock (25) consists in an interaction of recesses (26) in an end side (27) and in the outer circumferential side (21) of the bearing element (3) with engagement means, wherein, in the installed state of the bearing element (3), the engagement means engage in the recesses (26) and thereby prevent a relative rotation of the bearing element (3) with respect to the bearing element receptacle (7), i.e. an opening of the bayonet closure (15).
  2. Portable electric power tool according to Claim 1, characterized in that the bearing element (3) is a bearing ring (4) through which the hammer tube (1) reaches.
  3. Portable electric power tool according to either of the preceding claims, characterized in that the bearing element (3) is a plain bearing element.
  4. Portable electric power tool according to one of the preceding claims, characterized in that the bearing element (3) has at least one fixing means (23) on its outer side for fixing on the housing.
  5. Portable electric power tool according to Claim 4, characterized in that the fixing means (23) is designed as a protruding fixing lug (24).
  6. Portable electric power tool according to either of Claims 4 and 5, characterized in that the fixing means (23) is formed integrally with the bearing element (3).
  7. Portable electric power tool according to one of the preceding claims, characterized in that the housing has a gear housing (6) and/or an intermediate housing, and in that the bearing element (3) is located in the gear housing (6) and/or in the intermediate housing.
  8. Portable electric power tool according to one of the preceding claims, characterized in that the hammer tube (1) is mounted in only one bearing element (3).
  9. Portable electric power tool according to Claim 8, characterized in that the only one bearing element (3) is arranged in the gear housing (6).
  10. Portable electric power tool according to one of the preceding claims, characterized in that the bearing element (3) has an outside diameter which is larger than each outside diameter of components which are attached to the hammer tube (1) between the bearing element (3) and a hammer tube end side assigned to or to be assigned to a tool-holding fixture (9), and which are assigned to the hammer tube (1).
  11. Method for introducing the hammer tube (1) into the housing of a portable electric power tool according to one or more of the preceding claims, wherein the housing has a motor region, and the portable electric power tool is provided with a tool-holding fixture, characterized in that the hammer tube (1) is pushed from the motor region in the direction of the tool-holding fixture into the housing, wherein, as the hammer tube is being pushed in, it reaches through the bearing element receptacle (7) for receiving the bearing element (3), and wherein the hammer tube (1) is fixed axially via fixing of the bearing element (3), which is arranged on the hammer tube (1), in the bearing element receptacle (7) by formation of a bayonet closure by means of rotation, wherein, in the installed state of the bearing element, engagement means arranged on a housing cover of the housing engage in the recesses in an end side and in an outer circumferential side of the bearing element (3) in order to prevent a relative rotation of the bearing element (3) with respect to the bearing element receptacle (7), i.e. an opening of the bayonet closure, wherein the engagement means are formed by a web arranged on the inner side of the housing cover (12).
EP09173522.5A 2008-12-19 2009-10-20 Electric hand tool, in particular hammer drill and/or demolition hammer Not-in-force EP2199028B1 (en)

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DE102008054978A DE102008054978A1 (en) 2008-12-19 2008-12-19 Electric hand tool, in particular drill and / or hammer

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Publication number Priority date Publication date Assignee Title
US9573262B2 (en) * 2012-11-19 2017-02-21 Makita Corporation Impact tool
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EP2199028A3 (en) 2014-01-22
EP2199028A2 (en) 2010-06-23
DE102008054978A1 (en) 2010-06-24

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