EP2476520B1 - Electric machine tool, in particular a grinding or polishing machine - Google Patents

Electric machine tool, in particular a grinding or polishing machine Download PDF

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Publication number
EP2476520B1
EP2476520B1 EP11189077.8A EP11189077A EP2476520B1 EP 2476520 B1 EP2476520 B1 EP 2476520B1 EP 11189077 A EP11189077 A EP 11189077A EP 2476520 B1 EP2476520 B1 EP 2476520B1
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EP
European Patent Office
Prior art keywords
housing
wall
power tool
electric power
air
Prior art date
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Active
Application number
EP11189077.8A
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German (de)
French (fr)
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EP2476520A2 (en
EP2476520A3 (en
Inventor
Jan Schulze
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2476520A2 publication Critical patent/EP2476520A2/en
Publication of EP2476520A3 publication Critical patent/EP2476520A3/en
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Classifications

    • 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
    • B25F5/008—Cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant

Definitions

  • the present invention relates to a power tool, in particular a grinding or polishing machine, comprising a housing in which a drive, a fan unit and an electronic device are accommodated.
  • a power tool in particular a grinding or polishing machine
  • a housing in which a drive, a fan unit and an electronic device are accommodated.
  • an air flow for cooling the drive can be generated by ambient air is drawn through at least one air inlet opening in the housing.
  • at least one air channel is further formed, which extends in the flow direction of the air flow from the air inlet opening to the drive and allows a directed air supply to the drive.
  • the housing is designed in several parts and comprises at least two half shells.
  • a power tool according to the preamble to a battery (DC) - and / or a network (AC) -Electrotechnikmaschine, for example, a grinding or polishing machine or the like.
  • Such power tool machines have a housing in which components are accommodated, which generate heat as power loss, such as the drive or the electronic device. To dissipate the heat generated by these heat, a fan unit is provided which can generate a cooling air flow.
  • the power consumption of the electric machine tool is limited by the heat accumulating within the housing, so that it is only ensured with sufficient cooling that the power tool can exploit the entire performance space available to it.
  • the service life of the machine components of the power tool is improved by sufficient cooling.
  • the DE 10 2007 000 290 A1 discloses therefore to effect a targeted or directed air supply by means of air guide elements, which limit a Mauströmungspfad, via which at least a portion of the non-directional main air flow of the electronic device can be fed.
  • the electronic device is arranged in an end portion of the handle housing part facing away from the drive housing part.
  • An airflow is drawn into the housing via a plurality of housing slots by means of the fan device of the power tool and flows along a main flow path bounded by the drive housing part to the fan device.
  • the provided air guide elements are substantially perpendicular to the main flow direction along the drive motor and lead a side stream in the arranged substantially perpendicular to the drive housing housing of the handle portion.
  • the housing of the power tool is designed in several parts and comprises a gear housing, a motor housing and a handle housing, which are arranged one behind the other.
  • the handle housing in which the handle switch and the essential part of the electronic device is accommodated, is separated from the motor housing by intermediate walls.
  • the air intake slots for sucking the Cooling air is attached to the upstream engine case, so that the entire electronic device, in particular the grip switch, does not come into contact with the cooling air.
  • Comparable solutions in which the air intake slots are also not arranged in the region of the handle switch of the electronic device are also from the US 5,099,160 A , from the US 2,452,268 A , from the DE 10 2007 039 828 B3 , from the DE 10 2006 000 084 A1 as well as from the WO 2009/145206 A2 known.
  • the latter discloses a housing arrangement in which, for a specific embodiment, an additional air guide plate is arranged within the handle housing, which serves to guide an air flow past the electronics unit.
  • Another power tool is out of the DE 10 2006 038 756 A1 in which a device for generating a cooling air flow is provided. At least one rigid and / or flexible air duct is arranged in the housing of the power tool, with one end of the air duct of the device for generating a cooling air flow and the other end of the air duct facing the heat-generating component. The air duct then conducts and distributes the air flow for cooling the heat source in the form of the electric motor.
  • the DE 10 2007 017 243 A1 further discloses a hand tool in which within the housing an air guide is provided which directs a drive motor sweeping air flow to the outside.
  • the DE 103 47 943 A1 a power tool in which in the interior of the housing, a support plate is provided with two recessed cooling channels therein, which lead substantially straight from two arranged on an end side of the housing intake manifold to the motor housing.
  • the intake nozzles protrude out of the housing.
  • the cooling channels are covered with a cover plate, so that airtight cooling channels are formed inside the housing. The cooling air passes in this way in the cooling channels unaffected by the switch to the motor housing.
  • the shows GB 2 383 007 A a hand tool machine with a housing insert, the air inlet slots, which can be closed or opened by means of a sliding frame member.
  • the frame element can be actuated by a user with the aid of a push button, which protrudes from the machine housing, so that it can optionally open or close the air slots.
  • the air ducts are composed of several individual parts, which are firmly flanged together. These are then used in the assembly of the power tool in the housing half shells of the housing.
  • an object of the present invention is to provide the simplest and most efficient cooling of the drive, in which the known disadvantages are at least reduced.
  • a power tool comprising a housing in which a drive, a fan unit and an electronic device are accommodated, wherein with the aid of the fan unit an air flow for cooling the drive can be generated by ambient air drawn through at least one air inlet opening into the housing is formed, and wherein within the housing at least one air passage which extends in the flow direction of the air flow from the air inlet opening to the drive and allows a directed air supply to the drive.
  • the air inlet opening is arranged in an end region of the power tool, which faces away from the workpiece to be machined in a processing of a workpiece with the power tool.
  • the housing is at least partially double-walled with a housing inner wall and a housing outer wall spaced therefrom, wherein the air duct is bounded by the housing outer wall and the housing inner wall.
  • Such an air channel allows a directed air supply starting from the at least one air inlet opening up to the drive to be cooled.
  • a single air inlet opening may be provided with a single air duct.
  • at least two air inlet openings are preferred, wherein each air inlet opening is assigned an air channel.
  • the air inlet opening (s) is arranged in an end region of the electric machine tool, which faces away from the workpiece to be machined in a machining of a workpiece with the power tool, the risk of contamination by airborne dirt particles is already clear reduced. Due to the double-walled design of the housing in the region of the air channel with a housing outer wall and a housing inner wall spaced therefrom, the simplest possible and most cost-effective provision of a channel for a directed air supply is possible. The risk of unintentional damage or damage to the channel walls during assembly of the electric machine tool is significantly reduced in this way.
  • the at least one air inlet opening is formed on an end face of the housing by the clearance space between the housing outer wall and the housing inner wall and is bounded by the housing outer wall and the housing inner wall.
  • the housing end face is not completely closed by the housing outer wall, but is open at least in the region of the air inlet opening.
  • the distance space is defined as that space which is limited by the distance between the housing inner wall and the housing outer wall.
  • the electronic unit which is received in the housing in such a way that it is at least partially separated by the housing inner wall of the air duct, i. that it is accommodated within the space defined by the housing inner wall in the housing.
  • the housing inner wall bounds a substantially closed chamber, which is at least partially accommodated within the housing outer wall.
  • the design form in which the housing inner wall defines a substantially closed chamber is particularly advantageous since it provides for the provision of an electronics device encapsulated as such, as is customary in practice has become (encapsulated switch), superfluous. Consequently, less expensive electronic components can be used for the electronic device without the risk of a reduced lifetime of the electronic device.
  • the housing outer wall may be formed as a lateral surface of a substantially cylindrical body which forms at least partially a handle portion of the power tool.
  • this is relatively simple and inexpensive and extends along a longitudinal axis.
  • the individual components i.
  • the electronic device, the drive and the fan unit arranged one behind the other.
  • At one end of the housing extends from this a drive shaft with a tool holder with which any kind of tool, such as a grinding or polishing wheel, is connectable.
  • the handle portion of the power tool is intended to be enclosed by one or two hands of the user. The smaller the restrictions with regard to the intended gripping area of the gripping part, the simpler the handling for a user, since he does not have to pay attention to where he may grasp the machine tool in the housing area and on which he should not do so.
  • the at least one air inlet opening may be formed on an end face of the housing by the distance space between the housing outer wall and the housing inner wall.
  • the housing is the end not completely closed by the housing outer wall, but is open at least in the region of the air inlet opening.
  • the distance space is defined as that space which is limited by the distance between the housing inner wall and the housing outer wall.
  • the air inlet opening or air inlet openings has at least one, preferably a plurality of, mutually parallel support ribs. These may also extend between the housing outer wall and the housing inner wall to support them against each other. In this way it is prevented that in a production of the housing made of a relatively soft material, such as from a deformable under low force plastic, the user can not close the air inlet opening by a too firm grip by deformation of the housing outer wall undesirable.
  • the at least one support rib extends along the entire air channel in the flow direction of the air flow.
  • the housing outer wall projects beyond the at least one air inlet opening at least in sections.
  • the housing outer wall does not terminate flush with the at least one support rib or with the support ribs of the at least one air inlet opening, but projects beyond it (in a direction away from the tool of the power tool machine).
  • the user unintentionally closes the at least one air inlet opening with his hand (for example the palm of his hand) when he grasps the grip part of the power tool.
  • the housing is formed in several parts and comprises at least two half-shells.
  • Particularly preferred is the so-called pot construction, in which the housing has a pot-like framework, to which the two half-shells and optionally further housing parts can be attached.
  • the power tool may comprise as drive an electric motor with a collector and means for electrically contacting the collector, wherein the air duct directs a directed to the means for electrically contacting the collector air flow.
  • Such means for electrically contacting the collector may include, for example carbon brushes or the like.
  • the present invention also relates to a housing for a power tool with the features of claims 1 to 10.
  • FIG. 1 shows a power tool according to the invention, which is generally designated by the reference numeral 10.
  • the electric machine tool 10 comprises a tool-side output 12 and one viewed along a longitudinal axis L.
  • the handle part 14 is formed on a housing 16 which comprises a plurality of housing parts 16 1 and 16 2 , wherein the housing part 16 1 is formed as a housing pot with a gripping portion 36 A and a mounting portion 36 B, attached to the two half-shell-shaped housing parts 16 2 can be.
  • the housing part 16 1 is formed as a housing pot with a gripping portion 36 A and a mounting portion 36 B, attached to the two half-shell-shaped housing parts 16 2 can be.
  • FIG. 1 only one such shell-shaped housing part 16 2 is mounted in the lower region, while the upper region shows the attachment section 36 B and the components of the power tool 10 housed therein.
  • housing 16 by a plurality of housing parts, which need not necessarily be formed in the form of a half shell or must be cup-shaped.
  • an electric motor 20 (in FIG. 1 only indicated) trained drive recorded, which can be activated and deactivated via a slide switch.
  • the slide switch on a switching element 18 which can be manually operated by a user.
  • the switching element 18 is, as in FIG. 1 is clearly shown, arranged in the grip region of the electric machine tool 10 on the outer peripheral surface of the housing 16.
  • Such an arrangement of the switching element 18 allows a simple and uncomplicated handling for a user, since he has to solve without the hand of the handle portion 14 of the electric machine tool 10, these can turn on and off by means of the switching element 18.
  • the drive of the present power tool 10 is, as mentioned above, designed as an electric motor 20 and conventionally comprises a rotor which is rotatable about the longitudinal axis L and fixed to a rotor output shaft (not shown), and a stator (not shown). that at least partially surrounds the rotor. Due to the geometry of the stator, an air gap is usually formed between the rotor and the stator of the electric motor 20. This allows ventilation of the electric motor and thus reduces power losses of the drive due to overheating.
  • the rotor output shaft is drivingly connected to a driven shaft 22.
  • This is centrally received in an attachment with a substantially cylindrical housing 22A and has at its free end a tool holder 22B for receiving an associated tool (not shown).
  • a transmission (not shown) may further be provided, which is received in a corresponding housing 34 in the illustrated embodiment.
  • Such a transmission allows a transmission or reduction of the transmitted from the motor drive and its driving shaft torque to the output 12th
  • a shift rod 30 is provided as a switching member of the Schallschiebers, which is connected to the switching element 18 and serves to turn the motor drive on and off.
  • an electronic unit 32 is additionally provided, which cooperates with the shift rod 30 and the electric motor 20 is only supplied with power when the switching element 18 is in a corresponding on position.
  • the electronic unit 32 for example, have a pressure switch which is biased by a pressure spring integrated into the pressure switch in a position in which the electronics unit 32, the motor drive 20 is not energized. To turn on the motor drive 20 by means of the activation unit 32, it is therefore necessary to press the pressure switch in the direction of the motor drive 20 against the action of the integrated spring.
  • the shift rod 30 takes on the task of transmitting a translational displacement of the switching element 18 along the longitudinal axis L to the pressure switch.
  • the electronics unit 32 is connected via a cable connection to a flow network.
  • a power supply with the help of a to be attached to the housing 16 or integrated battery.
  • the electric motor 20 is connected to a fan unit designed as a fan wheel 26 such that a rotational movement of the rotor shaft causes a rotational movement of the fan 26 results.
  • the fan 26 is formed in a conventional manner such that an air flow is generated by such a rotational movement, wherein within the housing 16, a suction chamber is formed.
  • the sucked air is discharged via air outlets 38 in the transmission housing 34 to the outside, as indicated by the arrow labeled LU.
  • the housing 16 of the handle portion 14 also has on its side facing away from the output 12 end air inlet openings 68, is sucked through the outside air into the housing 16, as indicated by the arrow drawn with LU.
  • FIGS. 2A and 2 B is a plan view of the power tool 10 according to the invention according to FIG. 1 shown, the FIG. 2B a detailed view of the in FIG. 2A With B represents designated section.
  • the FIG. 3 further shows one of the housing shells 16 2 in plan view.
  • the first cup-shaped housing part 16 1 has, in addition to its gripping surface forming a gripping portion 36 A (in FIG. 2A left) on a mounting portion 36 B, to which two half-shell-shaped housing parts 16 2 can be attached.
  • mounting recesses 48 are provided in the region of the fastening section 36B, in which corresponding fastening projections 46 of the housing shell parts 16 2 can engage (cf. FIG. 3 ).
  • the housing 16 In the housing 16 are two air channels 66 (in FIGS. 2A to 3 above and below) formed, each by a housing outer wall 40 and a housing inner wall 50 are limited.
  • the housing outer wall 40 is formed as a lateral surface of a substantially cylindrical body which forms a rear section of the grip part 14 of the power tool 10.
  • each of the housing shells 16 2 specific compound geometries to ensure an exact alignment of the two housing shells 16 2 to each other at their connection with each other.
  • the lower housing shell 16 2 in FIGS. 2A to 3 shown) first recesses 54 and second recesses 56, can be added to the corresponding, for example, peg-shaped projections of the upper housing shell, not shown.
  • 54 screw receptacles 52 are formed on the first recesses, which extend concentrically to the first recesses 54 and allow the inclusion of fastening screws for connecting the housing half-shell parts 16 2 .
  • a cable recess 72 in the two housing shell parts 16 2 is provided on the front side.
  • an unillustrated electric cable may extend to the electronics unit 32 in the illustrated embodiment.
  • a groove 42 or corresponding projections are provided on the respective other housing half shell.
  • a special feature of the present invention is the fact that the housing inner walls define an inner housing chamber in which the electronic unit 32 is accommodated.
  • the housing inner walls 50 extend inwardly from the inner surface of the housing outer wall 40 so that this inner chamber for the electronics unit 32 is bounded not only by the housing inner walls 50 but also by the housing outer wall 40.
  • the housing inner wall 50 in an assembled state of the housing shells 16 2 also forms a circumferential lateral surface which is at least partially surrounded by the housing outer wall 40.
  • this inner chamber is bounded by an additional wall 60 which has a recess 62 for the shift rod 30 (see for example Figure 3).
  • the housing half shells 16 2 as well as the housing pot 16 1 can usually be made of plastic, which can be prepared for example by means of injection molding. To stabilize the housing inner walls 50 may be cast on these support ribs 64A and 64B.
  • the air inlet openings 68 are arranged on the front side in an end region of the housing 16 and are formed by the gap between the outer housing wall 40 and the housing inner walls 50.
  • a plurality of support ribs 70 between the housing walls 40 and 50 are arranged. These are aligned substantially parallel to one another and each extend from the housing outer wall 40 to the adjacent housing inner wall 50.
  • the housing outer wall 40 is formed in the end-side end region with a projection 44 relative to the support ribs 70. This serves to significantly minimize the risk of the air inlet openings 68 being undesirably closed by hand, even when a user grips the grip part 14 of the power tool 10 in its end region.
  • the air channels 66 extend from the air inlet openings 68 to the contacting means 28 of the electric motor 20, which are usually formed as carbon brushes, which are secured to a corresponding spring. Due to the special design of the air duct 66, a directed air supply to the components of the electric motor 20 is possible, which are subject to a particularly pronounced heat development due to their continuous sliding contact with the collector of the electric motor and the resulting frictional heat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Description

Die vorliegende Erfindung betrifft eine Elektrowerkzeugmaschine, insbesondere eine Schleif- oder Poliermaschine, umfassend ein Gehäuse, in dem ein Antrieb, eine Lüftereinheit sowie eine Elektronikeinrichtung aufgenommen sind. Mit Hilfe der Lüftereinheit ist ein Luftstrom zur Kühlung des Antriebs erzeugbar, indem Umgebungsluft durch wenigstens eine Lufteinlassöffnung in das Gehäuse eingezogen wird. Innerhalb des Gehäuses ist ferner wenigstens ein Luftkanal ausgebildet, der sich in Strömungsrichtung des Luftstroms von der Lufteinlassöffnung bis zu dem Antrieb erstreckt und eine gerichtete Luftzuführung zu dem Antrieb hin ermöglicht. Das Gehäuse ist mehrteilig ausgebildet und umfasst wenigstens zwei Halbschalen.The present invention relates to a power tool, in particular a grinding or polishing machine, comprising a housing in which a drive, a fan unit and an electronic device are accommodated. With the help of the fan unit, an air flow for cooling the drive can be generated by ambient air is drawn through at least one air inlet opening in the housing. Within the housing, at least one air channel is further formed, which extends in the flow direction of the air flow from the air inlet opening to the drive and allows a directed air supply to the drive. The housing is designed in several parts and comprises at least two half shells.

Allgemein handelt es sich bei einer Elektrowerkzeugmaschine gemäß dem Oberbegriff um eine Akku(DC)- und/oder eine Netz(AC)-Elektrowerkzeugmaschine, beispielsweise um eine Schleif- oder Poliermaschine oder dergleichen.In general, a power tool according to the preamble to a battery (DC) - and / or a network (AC) -Electrowerkzeugmaschine, for example, a grinding or polishing machine or the like.

Derartige Elektrowerkzeugmaschinen besitzen ein Gehäuse, in dem Bauteile aufgenommen sind, die als Verlustleistung Wärme erzeugen, wie beispielsweise der Antrieb oder die Elektronikeinrichtung. Zur Abführung der von diesen erzeugten Wärme ist eine Lüftereinheit vorgesehen, die einen Kühlluftstrom erzeugen kann.Such power tool machines have a housing in which components are accommodated, which generate heat as power loss, such as the drive or the electronic device. To dissipate the heat generated by these heat, a fan unit is provided which can generate a cooling air flow.

Die Leistungsaufnahme der Elektrowerkzeugmaschine wird durch die sich innerhalb des Gehäuses stauende Wärme begrenzt, so dass nur bei einer ausreichenden Kühlung gewährleistet ist, dass die Elektrowerkzeugmaschine den gesamten ihr verfügbaren Leistungsraum ausnutzen kann. Zudem wird durch eine ausreichende Kühlung auch die Standzeit der Maschinenkomponenten der Elektrowerkzeugmaschine verbessert.The power consumption of the electric machine tool is limited by the heat accumulating within the housing, so that it is only ensured with sufficient cooling that the power tool can exploit the entire performance space available to it. In addition, the service life of the machine components of the power tool is improved by sufficient cooling.

Im Stand der Technik hat sich jedoch gezeigt, dass eine ungerichtete Kühlung des Antriebs und/oder der Elektronikeinrichtung ungenügend sein kann. Die DE 10 2007 000 290 A1 offenbart daher, eine gezielte bzw. gerichtete Luftzuführung mit Hilfe von Luftleitelementen zu bewirken, die einen Nebenströmungspfad begrenzen, über den wenigstens ein Teil des ungerichteten Hauptluftstroms der Elektronikeinrichtung zuleitbar ist. Die Elektronikeinrichtung ist dabei in einem vom Antriebsgehäuseteil abgewandten Endabschnitt des Griffgehäuseteils angeordnet. Ein Luftstrom wird mit Hilfe der Lüftereinrichtung der Elektrowerkzeugmaschine über mehrere Gehäuseschlitze in das Gehäuse eingezogen und strömt entlang eines durch den Antriebsgehäuseteil begrenzten Hauptströmungspfad zur Lüftereinrichtung. Die vorgesehenen Luftleitelemente stehen im Wesentlichen senkrecht zu der Hauptströmungsrichtung entlang des Antriebsmotors und führen einen Nebenstrom in das im Wesentlichen senkrecht zu dem Antriebsgehäuse angeordnete Gehäuse des Griffteils.In the prior art, however, it has been shown that an undirected cooling of the drive and / or the electronic device may be insufficient. The DE 10 2007 000 290 A1 discloses therefore to effect a targeted or directed air supply by means of air guide elements, which limit a Nebenströmungspfad, via which at least a portion of the non-directional main air flow of the electronic device can be fed. The electronic device is arranged in an end portion of the handle housing part facing away from the drive housing part. An airflow is drawn into the housing via a plurality of housing slots by means of the fan device of the power tool and flows along a main flow path bounded by the drive housing part to the fan device. The provided air guide elements are substantially perpendicular to the main flow direction along the drive motor and lead a side stream in the arranged substantially perpendicular to the drive housing housing of the handle portion.

Eine vergleichbare Lösung ist ebenfalls aus der
DE 10 2008 000 613 A1 sowie aus der EP 1 674 213 A1 bekannt.A similar solution is also from the
DE 10 2008 000 613 A1 as well as from the EP 1 674 213 A1 known.

Ein weiteres Problem, das im Zusammenhang mit der Belüftung einer Elektrowerkzeugmaschine bekannt geworden ist, ergibt sich daraus, dass insbesondere bei Schleif- oder Poliermaschinen über die Lufteinlassöffnungen Staubpartikel oder dergleichen angesaugt werden können, was zu einer Beschädigung des Elektrowerkzeugs oder zumindest zur Beeinträchtigung der Lebensdauer derselben führen kann. So können derartige Schmutzpartikel in Kontakt mit der Elektronikeinrichtung kommen und im Laufe der Zeit die Funktion der Elektronikeinrichtung stark einschränken. Insbesondere elektrisch leitende Schmutzpartikel, beispielsweise Metallstaub oder Schmutzpartikel von eisenhaltigen Metallen, können sich an der Elektronikeinrichtung oder dem Elektromotor anlagern und zu einem unerwünschten Stromüberschlag innerhalb der Elektronikeinrichtung oder dem Elektromotor führen.Another problem that has become known in connection with the ventilation of a power tool, results from the fact that especially in grinding or polishing machines on the air inlet openings dust particles or the like can be sucked, resulting in damage to the power tool or at least to affect the life of the same can lead. Thus, such dirt particles come into contact with the electronic device and greatly restrict the function of the electronic device over time. In particular, electrically conductive dirt particles, such as metal dust or dirt particles of ferrous metals, can attach to the electronic device or the electric motor and lead to an undesirable flashover within the electronics or the electric motor.

Um dieses Problem zu lösen, ist es aus der EP 1 016 504 A2 bekannt, die Luftansaugschlitze nicht, wie bei herkömmlichen Elektrowerkzeugmaschinen, im Bereich des Griffschalters der Elektronikeinrichtung anzuordnen. Auf diese Weise soll eine Verschmutzung des Griffschalters und eine Funktionsbeeinträchtigung desselben vermieden werden. Hierzu ist das Gehäuse der Elektrowerkzeugmaschine mehrteilig ausgebildet und umfasst ein Getriebegehäuse, ein Motorgehäuse und ein Griffgehäuse, die hintereinander angeordnet sind. Das Griffgehäuse, in dem der Griffschalter und der wesentliche Teil der Elektronikeinrichtung aufgenommen ist, ist von dem Motorgehäuse durch Zwischenwände abgetrennt. Die Luftansaugschlitze zum Einsaugen der Kühlluft sind an dem vorgeschalteten Motorgehäuse angebracht, so dass die gesamte Elektronikeinrichtung, insbesondere der Griffschalter, nicht mit der Kühlluft in Verbindung kommen.To solve this problem, it is from the EP 1 016 504 A2 it is known not to arrange the air intake slots, as in conventional power tool machines, in the region of the handle switch of the electronic device. In this way, a contamination of the handle switch and a functional impairment of the same should be avoided. For this purpose, the housing of the power tool is designed in several parts and comprises a gear housing, a motor housing and a handle housing, which are arranged one behind the other. The handle housing, in which the handle switch and the essential part of the electronic device is accommodated, is separated from the motor housing by intermediate walls. The air intake slots for sucking the Cooling air is attached to the upstream engine case, so that the entire electronic device, in particular the grip switch, does not come into contact with the cooling air.

Vergleichbare Lösungen, bei denen die Luftansaugschlitze ebenfalls nicht im Bereich des Griffschalters der Elektronikeinrichtung angeordnet sind, sind außerdem aus der
US 5,099,160 A , aus der US 2,452,268 A , aus der DE 10 2007 039 828 B3 , aus der DE 10 2006 000 084 A1 sowie aus der WO 2009/145206 A2 bekannt. Letztere offenbart eine Gehäuseanordnung, bei der für eine spezielle Ausführungsform innerhalb des Griffgehäuses eine zusätzliche Luftleitplatte angeordnet ist, die dazu dient, einen Luftstrom an der Elektronikeinheit vorbeizuführen.Comparable solutions in which the air intake slots are also not arranged in the region of the handle switch of the electronic device, are also from the
US 5,099,160 A , from the US 2,452,268 A , from the DE 10 2007 039 828 B3 , from the DE 10 2006 000 084 A1 as well as from the WO 2009/145206 A2 known. The latter discloses a housing arrangement in which, for a specific embodiment, an additional air guide plate is arranged within the handle housing, which serves to guide an air flow past the electronics unit.

Eine weitere Elektrowerkzeugmaschine ist aus der DE 10 2006 038 756 A1 bekannt, bei der eine Einrichtung zur Erzeugung eines Kühlluftstroms vorgesehen ist. In dem Gehäuse der Elektrowerkzeugmaschine ist wenigstens ein starrer und/oder flexibler Luftkanal angeordnet, wobei das eine Ende des Luftkanals der Einrichtung zur Erzeugung eines Kühlluftstroms sowie das andere Ende des Luftkanals dem Wärme erzeugenden Bauteil zugewandt ist. Der Luftkanal leitet und verteilt den Luftstrom dann zur Kühlung der Wärmequelle in Form des Elektromotors.Another power tool is out of the DE 10 2006 038 756 A1 in which a device for generating a cooling air flow is provided. At least one rigid and / or flexible air duct is arranged in the housing of the power tool, with one end of the air duct of the device for generating a cooling air flow and the other end of the air duct facing the heat-generating component. The air duct then conducts and distributes the air flow for cooling the heat source in the form of the electric motor.

Die DE 10 2007 017 243 A1 offenbart ferner eine Handwerkzeugmaschine, bei der innerhalb des Gehäuses ein Luftleitelement vorgesehen ist, das einen den Antriebsmotor überstreichenden Luftstrom nach Außen leitet.The DE 10 2007 017 243 A1 further discloses a hand tool in which within the housing an air guide is provided which directs a drive motor sweeping air flow to the outside.

Ferner offenbart die DE 103 47 943 A1 eine Elektrowerkzeugmaschine, bei der im Inneren des Gehäuses eine Trägerplatte mit zwei darin eingelassenen Kühlkanälen vorgesehen ist, die im Wesentlichen geradlinig von zwei an einer Stirnseite des Gehäuses angeordneten Ansaugstutzen zum Motorgehäuse führen. Die Ansaugstutzen ragen aus dem Gehäuse heraus. Die Kühlkanäle sind mit einer Abdeckplatte abgedeckt, sodass luftdichte Kühlkanäle im Inneren des Gehäuses gebildet werden. Die Kühlluft gelangt auf diese Weise in den Kühlkanälen unbeeinflusst von dem Schalter zum Motorgehäuse.Further, the DE 103 47 943 A1 a power tool in which in the interior of the housing, a support plate is provided with two recessed cooling channels therein, which lead substantially straight from two arranged on an end side of the housing intake manifold to the motor housing. The intake nozzles protrude out of the housing. The cooling channels are covered with a cover plate, so that airtight cooling channels are formed inside the housing. The cooling air passes in this way in the cooling channels unaffected by the switch to the motor housing.

Schließlich zeigt die GB 2 383 007 A eine Handwerkzeugmaschine mit einem Gehäuseeinsatz, der Lufteinlassschlitze umfasst, die mit Hilfe eines verschiebbaren Rahmenelements geschlossen bzw. geöffnet werden können. Das Rahmenelement kann mit Hilfe eines Druckknopfes, der aus dem Maschinengehäuse herausragt, von einem Anwender betätigt werden, sodass dieser gegebenenfalls die Luftschlitze öffnen bzw. verschließen kann.Finally, the shows GB 2 383 007 A a hand tool machine with a housing insert, the air inlet slots, which can be closed or opened by means of a sliding frame member. The frame element can be actuated by a user with the aid of a push button, which protrudes from the machine housing, so that it can optionally open or close the air slots.

Die Luftkanäle sind aus mehreren Einzelteilen zusammengesetzt, die miteinander fest verflanscht sind. Diese werden dann bei der Montage der Elektrowerkzeugmaschine in die Gehäusehalbschalen des Gehäuses eingesetzt.The air ducts are composed of several individual parts, which are firmly flanged together. These are then used in the assembly of the power tool in the housing half shells of the housing.

Nachteilig bei einer solchen Gestaltung kann jedoch insbesondere die komplizierte Gestaltung eines Luftkanals durch eines oder mehrere separate Bauteile sein, die in das Gehäuse einsetzbar sein müssen. So ist es beispielsweise notwendig an dem Gehäuse Befestigungsstellen vorzusehen, an denen die Einzelteile angebracht werden können. Ferner kann insbesondere bei einem flexiblen Schlauchteil eine Beschädigung der Schlauchwand bei der Montage auftreten, was beispielsweise zusätzliche Nacharbeitsschritte und entsprechende Kosten zur Folge hat.A disadvantage of such a design, however, in particular, the complicated design of an air duct by one or more separate components, which must be used in the housing. For example, it is necessary to provide fastening points on the housing, on which the individual parts can be attached. Furthermore, in particular in the case of a flexible hose part, damage to the hose wall during assembly may occur, which, for example, results in additional reworking steps and corresponding costs.

Folglich besteht eine Aufgabe der vorliegenden Erfindung darin, eine möglichst einfache und effiziente Kühlung des Antriebs bereitzustellen, bei der die bekannten Nachteile zumindest verringert sind.Consequently, an object of the present invention is to provide the simplest and most efficient cooling of the drive, in which the known disadvantages are at least reduced.

Diese Aufgabe wird durch eine Elektrowerkzeugmaschine gelöst, die ein Gehäuse umfasst, in dem ein Antrieb, eine Lüftereinheit sowie eine Elektronikeinrichtung aufgenommen sind, wobei mit Hilfe der Lüftereinheit ein Luftstrom zur Kühlung des Antriebs erzeugbar ist, indem Umgebungsluft durch wenigstens eine Lufteinlassöffnung in das Gehäuse eingezogen wird, und wobei innerhalb des Gehäuses wenigstens ein Luftkanal ausgebildet ist, der sich in Strömungsrichtung des Luftstroms von der Lufteinlassöffnung bis zu dem Antrieb erstreckt und eine gerichtete Luftzuführung zu dem Antrieb hin ermöglicht. Ferner ist die Lufteinlassöffnung in einem endseitigen Bereich der Elektrowerkzeugmaschine angeordnet, der bei einer Bearbeitung eines Werkstücks mit der Elektrowerkzeugmaschine von dem zu bearbeitenden Werkstück abgewandt ist. Zudem ist das Gehäuse zumindest abschnittsweise doppelwandig mit einer Gehäuseinnenwand und einer dazu beabstandeten Gehäuseaußenwand ausgebildet, wobei der Luftkanal durch die Gehäuseaußenwand und die Gehäuseinnenwand begrenzt ist.This object is achieved by a power tool comprising a housing in which a drive, a fan unit and an electronic device are accommodated, wherein with the aid of the fan unit an air flow for cooling the drive can be generated by ambient air drawn through at least one air inlet opening into the housing is formed, and wherein within the housing at least one air passage which extends in the flow direction of the air flow from the air inlet opening to the drive and allows a directed air supply to the drive. Furthermore, the air inlet opening is arranged in an end region of the power tool, which faces away from the workpiece to be machined in a processing of a workpiece with the power tool. In addition, the housing is at least partially double-walled with a housing inner wall and a housing outer wall spaced therefrom, wherein the air duct is bounded by the housing outer wall and the housing inner wall.

Ein solcher Luftkanal ermöglicht eine gerichtete Luftzuführung ausgehend von der wenigstens einen Lufteinlassöffnung bis hin zu dem zu kühlenden Antrieb. Grundsätzlich kann gemäß der vorliegenden Erfindung eine einzige Lufteinlassöffnung mit einem einzigen Luftkanal vorgesehen sein. Bevorzugt werden jedoch zumindest zwei Lufteinlassöffnungen, wobei jeder Lusteinlassöffnung ein Luftkanal zugeordnet ist.Such an air channel allows a directed air supply starting from the at least one air inlet opening up to the drive to be cooled. In principle, according to the present invention, a single air inlet opening may be provided with a single air duct. However, at least two air inlet openings are preferred, wherein each air inlet opening is assigned an air channel.

Dadurch, dass die Lufteinlassöffnung(en) in einem endseitigen Bereich der Elektrowerkzeugmaschine angeordnet ist bzw. sind, der bei einer Bearbeitung eines Werkstücks mit der Elektrowerkzeugmaschine von dem zu bearbeitenden Werkstück abgewandt ist, wird das Risiko einer Verschmutzung durch in der Luft befindliche Schmutzpartikel bereits deutlich verringert. Durch die doppelwandige Gestaltung des Gehäuses im Bereich des Luftkanals mit einer Gehäuseaußenwand und einer hierzu beabstandeten Gehäuseinnenwand wird ferner eine möglichst einfache und kostengünstige Bereitstellung eines Kanals für eine gerichtete Luftzufuhr möglich. Das Risiko einer unbeabsichtigten Beeinträchtigung oder Beschädigung der Kanalwände während der Montage der Elektrowerkzeugmaschine wird auf diese Weise deutlich verringert.Characterized in that the air inlet opening (s) is arranged in an end region of the electric machine tool, which faces away from the workpiece to be machined in a machining of a workpiece with the power tool, the risk of contamination by airborne dirt particles is already clear reduced. Due to the double-walled design of the housing in the region of the air channel with a housing outer wall and a housing inner wall spaced therefrom, the simplest possible and most cost-effective provision of a channel for a directed air supply is possible. The risk of unintentional damage or damage to the channel walls during assembly of the electric machine tool is significantly reduced in this way.

Die wenigstens eine Lufteinlassöffnung ist an einer Stirnseite des Gehäuses durch den Abstandsraum zwischen der Gehäuseaußenwand und der Gehäuseinnenwand gebildet und wird durch die Gehäuseaußenwand und die Gehäuseinnenwand begrenzt. Bei einer solchen Gestaltungsvariante wird das Gehäuse stirnseitig nicht vollständig durch die Gehäuseaußenwand abgeschlossen, sondern ist zumindest im Bereich der Lufteinlassöffnung geöffnet. Der Abstandsraum ist dabei als derjenige Raum definiert, der durch den Abstand zwischen der Gehäuseinnenwand und der Gehäuseaußenwand begrenzt ist.The at least one air inlet opening is formed on an end face of the housing by the clearance space between the housing outer wall and the housing inner wall and is bounded by the housing outer wall and the housing inner wall. In such a design variant, the housing end face is not completely closed by the housing outer wall, but is open at least in the region of the air inlet opening. The distance space is defined as that space which is limited by the distance between the housing inner wall and the housing outer wall.

Es kann ferner vorgesehen sein, dass die Elektronikeinheit die derart in dem Gehäuse aufgenommen ist, dass sie zumindest abschnittsweise durch die Gehäuseinnenwand von dem Luftkanal getrennt ist, d.h. dass sie innerhalb des durch die Gehäuseinnenwand begrenzten Raum in dem Gehäuse aufgenommen ist. Besonders vorteilhaft begrenzt die Gehäuseinnenwand eine im Wesentlichen abgeschlossene Kammer, die zumindest abschnittsweise innerhalb der Gehäuseaußenwand aufgenommen ist. Durch eine solche Gestaltung wird die Elektronikeinheit, die innerhalb der Gehäuseinnenwand in dem Gehäuse aufgenommen ist, durch die Gehäuseinnenwand "gekapselt". Selbst wenn die Gehäuseinnenwand keine vollkommen in sich abgeschlossene Kammer bildet, wird der gerichtete Luftstrom zwischen der Gehäuseinnenwand und der Gehäuseaußenwand an der Elektronikeinheit vorbeigeführt, so dass sich in der Kühlluft befindliche Schmutzpartikel nicht in Kontakt mit der Elektronikeinheit gelangen.It may further be provided that the electronic unit which is received in the housing in such a way that it is at least partially separated by the housing inner wall of the air duct, i. that it is accommodated within the space defined by the housing inner wall in the housing. Particularly advantageously, the housing inner wall bounds a substantially closed chamber, which is at least partially accommodated within the housing outer wall. By such a configuration, the electronic unit, which is accommodated within the housing inner wall in the housing, "encapsulated" by the housing inner wall. Even if the housing inner wall does not form a completely self-contained chamber, the directed air flow between the housing inner wall and the housing outer wall is guided past the electronics unit, so that dirt particles in the cooling air do not come into contact with the electronics unit.

Die Gestaltungsform, bei der die Gehäuseinnenwand eine im Wesentlichen abgeschlossene Kammer begrenzt, ist besonders vorteilhaft, da diese das Vorsehen einer als solche gekapselten Elektronikeinrichtung, wie sie teilweise in der Praxis üblich geworden ist (gekapselter Schalter), überflüssig macht. Folglich können kostengünstigere Elektronikkomponenten für die Elektronikeinrichtung eingesetzt werden, ohne das Risiko einer verringerten Lebensdauer der Elektronikeinrichtung.The design form in which the housing inner wall defines a substantially closed chamber is particularly advantageous since it provides for the provision of an electronics device encapsulated as such, as is customary in practice has become (encapsulated switch), superfluous. Consequently, less expensive electronic components can be used for the electronic device without the risk of a reduced lifetime of the electronic device.

Ferner kann die Gehäuseaußenwand als eine Mantelfläche eines im Wesentlichen zylinderförmigen Körpers geformt sein, der zumindest teilweise ein Griffteil der Elektrowerkzeugmaschine bildet. Bei einer solchen Gestaltung des Gehäuses ist dieses vergleichsweise einfach und kostengünstig aufgebaut und erstreckt sich entlang einer Längsachse. Üblicherweise sind innerhalb des Gehäuses die einzelnen Komponenten, d.h. beispielsweise die Elektronikeinrichtung, der Antrieb und die Lüftereinheit hintereinander angeordnet. An einem Ende des Gehäuses erstreckt sich aus diesem eine Antriebswelle mit einer Werkzeugaufnahme, mit der ein wie auch immer geartetes Werkzeug, beispielsweise ein Schleif- oder Polierscheibe, verbindbar ist. Das Griffteil der Elektrowerkzeugmaschine dient dazu, von einer oder zwei Händen des Anwenders umschlossen zu werden. Je geringfügiger die Einschränkungen bezüglich des vorgesehenen Griffbereichs des Griffteils sind, desto unkomplizierter gestaltet sich für einen Anwender die Handhabung, da er nicht darauf achten muss, an welcher Stelle er die Werkzeugmaschine im Gehäusebereich greifen darf und an welcher er dies nicht tun sollte.Further, the housing outer wall may be formed as a lateral surface of a substantially cylindrical body which forms at least partially a handle portion of the power tool. In such a design of the housing, this is relatively simple and inexpensive and extends along a longitudinal axis. Usually, within the housing, the individual components, i. For example, the electronic device, the drive and the fan unit arranged one behind the other. At one end of the housing extends from this a drive shaft with a tool holder with which any kind of tool, such as a grinding or polishing wheel, is connectable. The handle portion of the power tool is intended to be enclosed by one or two hands of the user. The smaller the restrictions with regard to the intended gripping area of the gripping part, the simpler the handling for a user, since he does not have to pay attention to where he may grasp the machine tool in the housing area and on which he should not do so.

Die wenigstens eine Lufteinlassöffnung kann an einer Stirnseite des Gehäuses durch den Abstandsraum zwischen der Gehäuseaußenwand und der Gehäuseinnenwand gebildet sein. Bei einer solchen Gestaltungsvariante wird das Gehäuse stirnseitig nicht vollständig durch die Gehäuseaußenwand abgeschlossen, sondern ist zumindest im Bereich der Lufteinlassöffnung geöffnet. Der Abstandsraum ist dabei als derjenige Raum definiert, der durch den Abstand zwischen der Gehäuseinnenwand und der Gehäuseaußenwand begrenzt ist.The at least one air inlet opening may be formed on an end face of the housing by the distance space between the housing outer wall and the housing inner wall. In such a Design variant, the housing is the end not completely closed by the housing outer wall, but is open at least in the region of the air inlet opening. The distance space is defined as that space which is limited by the distance between the housing inner wall and the housing outer wall.

Ferner kann vorgesehen sein, dass die Lufteinlassöffnung bzw. Lufteinlassöffnungen wenigstens eine, vorzugsweise mehrere, zueinander parallele Stützrippen aufweist. Diese können sich ferner zwischen der Gehäuseaußenwand und der Gehäuseinnenwand erstrecken, um diese gegeneinander abzustützen. Auf diese Weise wird verhindert, dass bei einer Herstellung des Gehäuses aus einem vergleichsweise weichen Material, wie beispielsweise aus einem unter geringer Krafteinwirkung verformbaren Kunststoff, der Anwender durch einen zu festen Griff die Lufteinlassöffnung durch eine Verformung der Gehäuseaußenwand nicht unerwünscht verschließen kann. Gegebenenfalls kann es auch sinnvoll sein, dass die wenigstens eine Stützrippe sich entlang des gesamten Luftkanals in Strömungsrichtung des Luftstroms erstreckt.Furthermore, it can be provided that the air inlet opening or air inlet openings has at least one, preferably a plurality of, mutually parallel support ribs. These may also extend between the housing outer wall and the housing inner wall to support them against each other. In this way it is prevented that in a production of the housing made of a relatively soft material, such as from a deformable under low force plastic, the user can not close the air inlet opening by a too firm grip by deformation of the housing outer wall undesirable. Optionally, it may also be appropriate that the at least one support rib extends along the entire air channel in the flow direction of the air flow.

Ferner kann vorgesehen sein, dass die Gehäuseaußenwand die wenigstens eine Lufteinlassöffnung wenigstens abschnittsweise überragt. Bei dieser Ausführungsform schließt die Gehäuseaußenwand nicht bündig mit der wenigstens einen Stützrippe bzw. mit den Stützrippen der wenigstens einen Lufteinlassöffnung ab, sondern steht über diesen (in einer Richtung von dem Werkzeug der Elektrowerkzeugmaschine weg) vor. Dadurch kann verhindert werden, dass der Anwender unbeabsichtigt mit seiner Hand (beispielsweise dem Handballen) die wenigstens eine Lufteinlassöffnung verschließt, wenn er das Griffteil der Elektrowerkzeugmaschine umgreift.Furthermore, it can be provided that the housing outer wall projects beyond the at least one air inlet opening at least in sections. In this embodiment, the housing outer wall does not terminate flush with the at least one support rib or with the support ribs of the at least one air inlet opening, but projects beyond it (in a direction away from the tool of the power tool machine). As a result, it can be prevented that the user unintentionally closes the at least one air inlet opening with his hand (for example the palm of his hand) when he grasps the grip part of the power tool.

Für eine möglichst einfache Herstellung und Montage kann vorgesehen sein, dass das Gehäuse mehrteilig ausgebildet ist und wenigstens zwei Halbschalen umfasst. Besonders bevorzugt ist dabei die sogenannte Topfbauweise, bei der das Gehäuse ein topfartiges Gerüst aufweist, an das die beiden Halbschalen und gegebenenfalls weitere Gehäuseteile angebracht werden können.For the simplest possible manufacture and assembly can be provided that the housing is formed in several parts and comprises at least two half-shells. Particularly preferred is the so-called pot construction, in which the housing has a pot-like framework, to which the two half-shells and optionally further housing parts can be attached.

Die Elektrowerkzeugmaschine kann als Antrieb einen Elektromotor mit einem Kollektor und mit Mitteln zur elektrischen Kontaktierung des Kollektors umfassen, wobei der Luftkanal einen auf die Mittel zur elektrischen Kontaktierung des Kollektors gerichteten Luftstroms leitet. Derartige Mittel zur elektrischen Kontaktierung des Kollektors können beispielsweise Kohlebürsten oder dergleichen umfassen.The power tool may comprise as drive an electric motor with a collector and means for electrically contacting the collector, wherein the air duct directs a directed to the means for electrically contacting the collector air flow. Such means for electrically contacting the collector may include, for example carbon brushes or the like.

Schließlich betrifft die vorliegende Erfindung auch ein Gehäuse für eine Elektrowerkzeugmaschine mit den Merkmalen der Ansprüche 1 bis 10.Finally, the present invention also relates to a housing for a power tool with the features of claims 1 to 10.

Die Erfindung wird nachfolgend unter Bezugnahme auf die beigefügten Figuren beschrieben, die eine bevorzugte Ausführungsform der Erfindung darstellen. Der Fachmann wird die in der Zeichnung, der Beschreibung und den Ansprüchen in Kombination offenbarten Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.The invention will be described below with reference to the accompanying figures, which illustrate a preferred embodiment of the invention. The person skilled in the art will expediently also individually consider the features disclosed in the drawing, the description and the claims in combination and combine these into meaningful further combinations.

Es zeigen schematisch:

Figur 1
eine isometrische Ansicht einer erfindungsgemäßen Elektrowerkzeugmaschine;
Figur 2A und 2B
die erfindungsgemäße Elektrowerkzeugmaschine gemäß Figur 1 in einer Draufsicht bzw. einer Detailansicht; und
Figur 3
eine Gehäuseschale der erfindungsgemäßen Elektrowerkzeugmaschine gemäß den Figuren 1, 2A und 2B.
They show schematically:
FIG. 1
an isometric view of a power tool according to the invention;
FIGS. 2A and 2B
the power tool according to the invention according to FIG. 1 in a plan view and a detailed view; and
FIG. 3
a housing shell of the power tool according to the invention according to the FIGS. 1 . 2A and 2 B ,

Die Figur 1 zeigt eine erfindungsgemäße Elektrowerkzeugmaschine, die allgemein mit dem Bezugszeichen 10 versehen ist.The FIG. 1 shows a power tool according to the invention, which is generally designated by the reference numeral 10.

Die Elektrowerkzeugmaschine 10 umfasst einen werkzeugseitigen Abtrieb 12 sowie ein entlang einer Längsachse L betrachtet vorgeschaltetes Griffteil 14. Das Griffteil 14 ist an einem Gehäuse 16 ausgebildet, welches mehrere Gehäuseteile 161 und 162 umfasst, wobei das Gehäuseteil 161 als Gehäusetopf mit einem Greifabschnitt 36A und einem Befestigungsabschnitt 36B ausgebildet ist, an den zwei halbschalenförmige Gehäuseteile 162 angesetzt werden können. In Figur 1 ist nur ein solches schalenförmiges Gehäuseteil 162 im unteren Bereich angebracht, während der obere Bereich den Befestigungsabschnitt 36B und die darin aufgenommenen Komponenten der Elektrowerkzeugmaschine 10 zeigt.The electric machine tool 10 comprises a tool-side output 12 and one viewed along a longitudinal axis L. The handle part 14 is formed on a housing 16 which comprises a plurality of housing parts 16 1 and 16 2 , wherein the housing part 16 1 is formed as a housing pot with a gripping portion 36 A and a mounting portion 36 B, attached to the two half-shell-shaped housing parts 16 2 can be. In FIG. 1 only one such shell-shaped housing part 16 2 is mounted in the lower region, while the upper region shows the attachment section 36 B and the components of the power tool 10 housed therein.

Es ist selbstverständlich auch möglich, das Gehäuse 16 durch mehrere Gehäuseteile auszubilden, die nicht notwendigerweise halbschalenförmig ausgebildet sein müssen bzw. topfförmig ausgebildet sein müssen.It is of course also possible to form the housing 16 by a plurality of housing parts, which need not necessarily be formed in the form of a half shell or must be cup-shaped.

Innerhalb des Gehäuses 16 ist ferner ein als Elektromotor 20 (in Figur 1 nur angedeutet) ausgebildeter Antrieb aufgenommen, der über einen Schaltschieber aktiviert und deaktiviert werden kann. Hierzu weist der Schaltschieber ein Schaltelement 18 auf, das von einem Anwender manuell betätigt werden kann. Das Schaltelement 18 ist, wie in Figur 1 deutlich gezeigt ist, im Griffbereich der Elektrowerkzeugmaschine 10 an der Außenumfangsfläche des Gehäuses 16 angeordnet. Eine solche Anordnung des Schaltelements 18 ermöglicht eine einfache und unkomplizierte Handhabung für einen Anwender, da dieser ohne die Hand von dem Griffteil 14 der Elektrowerkzeugmaschine 10 lösen zu müssen, diese mit Hilfe des Schaltelements 18 ein- und ausschalten kann.Within the housing 16 is also an electric motor 20 (in FIG. 1 only indicated) trained drive recorded, which can be activated and deactivated via a slide switch. For this purpose, the slide switch on a switching element 18 which can be manually operated by a user. The switching element 18 is, as in FIG. 1 is clearly shown, arranged in the grip region of the electric machine tool 10 on the outer peripheral surface of the housing 16. Such an arrangement of the switching element 18 allows a simple and uncomplicated handling for a user, since he has to solve without the hand of the handle portion 14 of the electric machine tool 10, these can turn on and off by means of the switching element 18.

Der Antrieb der vorliegenden Elektrowerkzeugmaschine 10 ist, wie vorstehend erwähnt, als Elektromotor 20 ausgebildet und umfasst in üblicher Weise einen Rotor, der um die Längsachse L drehbar ist und mit einer Rotorabtriebswelle(nicht dargestellt) fest verbunden ist, sowie einen Stator (nicht dargestellt), der den Rotor zumindest teilweise umgreift. Zwischen dem Rotor und dem Stator des Elektromotors 20 ist, bedingt durch die Geometrie des Stators, üblicherweise ein Luftspalt ausgebildet. Dieser ermöglicht eine Belüftung des Elektromotors und verringert auf diese Weise Leistungsverluste des Antriebs durch Überhitzung.The drive of the present power tool 10 is, as mentioned above, designed as an electric motor 20 and conventionally comprises a rotor which is rotatable about the longitudinal axis L and fixed to a rotor output shaft (not shown), and a stator (not shown). that at least partially surrounds the rotor. Due to the geometry of the stator, an air gap is usually formed between the rotor and the stator of the electric motor 20. This allows ventilation of the electric motor and thus reduces power losses of the drive due to overheating.

Die Rotorabtriebswelle ist mit einer angetriebenen Welle 22 antreibend verbunden. Diese ist in einem Aufsatz mit einem im Wesentlichen zylinderförmigen Gehäuse 22A zentrisch aufgenommen und weist an ihrem freien Ende eine Werkzeugaufnahme 22B zur Aufnahme eines zugehörigen Werkzeugs (nicht dargestellt) auf.The rotor output shaft is drivingly connected to a driven shaft 22. This is centrally received in an attachment with a substantially cylindrical housing 22A and has at its free end a tool holder 22B for receiving an associated tool (not shown).

Zwischen dem Abtrieb des Elektromotors 20, d.h. der Rotorwelle, und der angetriebenen Welle 22 kann weiterhin ein Getriebe (nicht dargestellt) vorgesehen sein, das in der dargestellten Ausführungsform in einem entsprechenden Gehäuse 34 aufgenommen ist. Ein solches Getriebe ermöglicht eine Über- bzw. Untersetzung des von dem motorischen Antrieb und seiner antreibenden Welle übertragenen Drehmoments auf den Abtrieb 12.Between the output of the electric motor 20, that is, the rotor shaft, and the driven shaft 22, a transmission (not shown) may further be provided, which is received in a corresponding housing 34 in the illustrated embodiment. Such a transmission allows a transmission or reduction of the transmitted from the motor drive and its driving shaft torque to the output 12th

Wie in den Figuren 1 bis 2B zu erkennen ist, ist eine Schaltstange 30 als Schaltorgan des Schallschiebers vorgesehen, die mit dem Schaltelement 18 verbunden ist und dazu dient, den motorischen Antrieb ein- und auszuschalten. Hierzu ist zusätzlich eine Elektronikeinheit 32 vorgesehen, die mit der Schaltstange 30 zusammenwirkt und den Elektromotor 20 nur dann mit Strom versorgt, wenn das Schaltelement 18 in einer entsprechenden Ein-Stellung steht. Hierzu kann die Elektronikeinheit 32 beispielsweise einen Druckschalter aufweisen, der in einer Stellung, in der die Elektronikeinheit 32 den motorischen Antrieb 20 nicht mit Strom versorgt, durch einen in den Druckschalter integrierte Druckfeder vorgespannt ist. Um mit Hilfe der Aktivierungseinheit 32 den motorischen Antrieb 20 einzuschalten, ist es daher notwendig, den Druckschalter in Richtung zum motorischen Antrieb 20 gegen die Wirkung der integrierten Feder zu drücken. Die Schaltstange 30 übernimmt dabei die Aufgabe, eine translatorische Verlagerung des Schaltelements 18 entlang der Längsachse L auf den Druckschalter zu übertragen.As in the FIGS. 1 to 2B can be seen, a shift rod 30 is provided as a switching member of the Schallschiebers, which is connected to the switching element 18 and serves to turn the motor drive on and off. For this purpose, an electronic unit 32 is additionally provided, which cooperates with the shift rod 30 and the electric motor 20 is only supplied with power when the switching element 18 is in a corresponding on position. For this purpose, the electronic unit 32, for example, have a pressure switch which is biased by a pressure spring integrated into the pressure switch in a position in which the electronics unit 32, the motor drive 20 is not energized. To turn on the motor drive 20 by means of the activation unit 32, it is therefore necessary to press the pressure switch in the direction of the motor drive 20 against the action of the integrated spring. The shift rod 30 takes on the task of transmitting a translational displacement of the switching element 18 along the longitudinal axis L to the pressure switch.

In der dargestellten Ausführungsform ist die Elektronikeinheit 32 über eine Kabelverbindung mit einem Strömnetz verbunden. Alternativ kann jedoch auch eine Stromversorgung mit Hilfe eines an dem Gehäuse 16 anzubringenden oder integrierten Akkus erfolgen.In the illustrated embodiment, the electronics unit 32 is connected via a cable connection to a flow network. Alternatively, however, a power supply with the help of a to be attached to the housing 16 or integrated battery.

Der Elektromotor 20 ist bei der dargestellten Ausführungsform mit einer als Lüfterrad 26 ausgebildeten Lüftereinheit derart verbunden, dass eine Drehbewegung der Rotorwelle eine Drehbewegung des Lüfterrads 26 zur Folge hat. Das Lüfterrad 26 ist in üblicher Weise derart ausgebildet, dass durch eine solche Drehbewegung ein Luftstrom erzeugt wird, wobei innerhalb des Gehäuses 16 ein Saugraum entsteht. Die angesaugte Luft wird über Luftauslässe 38 in dem Getriebegehäuse 34 nach außen abgegeben, wie durch den mit LU bezeichneten Pfeil angedeutet. Das Gehäuse 16 des Griffteils 14 weist zudem an seiner von dem Abtrieb 12 abgewandten Stirnseite Lufteinlassöffnungen 68 auf, durch die Außenluft in das Gehäuse 16 eingesogen wird, wie durch den mit LU gezeichneten Pfeil angedeutet ist.In the illustrated embodiment, the electric motor 20 is connected to a fan unit designed as a fan wheel 26 such that a rotational movement of the rotor shaft causes a rotational movement of the fan 26 results. The fan 26 is formed in a conventional manner such that an air flow is generated by such a rotational movement, wherein within the housing 16, a suction chamber is formed. The sucked air is discharged via air outlets 38 in the transmission housing 34 to the outside, as indicated by the arrow labeled LU. The housing 16 of the handle portion 14 also has on its side facing away from the output 12 end air inlet openings 68, is sucked through the outside air into the housing 16, as indicated by the arrow drawn with LU.

In den Figuren 2A und 2B ist eine Draufsicht auf die erfindungsgemäße Elektrowerkzeugmaschine 10 gemäß Figur 1 gezeigt, wobei die Figur 2B eine Detailansicht des in Figur 2A mit B bezeichneten Ausschnitts darstellt. Die Figur 3 zeigt ferner eine der Gehäuseschalen 162 in der Draufsicht.In the FIGS. 2A and 2 B is a plan view of the power tool 10 according to the invention according to FIG. 1 shown, the FIG. 2B a detailed view of the in FIG. 2A With B represents designated section. The FIG. 3 further shows one of the housing shells 16 2 in plan view.

Das erste topfförmig ausgebildete Gehäuseteil 161 weist neben seinem eine Grifffläche bildenden Greifabschnitt 36A (in Figur 2A links) einen Befestigungsabschnitt 36B auf, an dem zwei halbschalenförmige Gehäuseteile 162 angebracht werden können. Für eine axiale Sicherung der Gehäuseschalenteile 162 sind im Bereich des Befestigungsabschnitts 36B Befestigungsausnehmungen 48 vorgesehen, in die korrespondierende Befestigungsvorsprünge 46 der Gehäuseschalenteile 162 eingreifen können (vgl. z.B. Figur 3).The first cup-shaped housing part 16 1 has, in addition to its gripping surface forming a gripping portion 36 A (in FIG. 2A left) on a mounting portion 36 B, to which two half-shell-shaped housing parts 16 2 can be attached. For an axial securing of the housing shell parts 16 2 , mounting recesses 48 are provided in the region of the fastening section 36B, in which corresponding fastening projections 46 of the housing shell parts 16 2 can engage (cf. FIG. 3 ).

In dem Gehäuse 16 sind zwei Luftkanäle 66 (in Figuren 2A bis 3 oben und unten) ausgebildet, die jeweils durch eine Gehäuseaußenwand 40 und eine Gehäuseinnenwand 50 begrenzt werden. Die Gehäuseaußenwand 40 ist dann, wenn beide Gehäuseschalen 162 miteinander verbunden sind, als Mantelfläche eines im Wesentlichen zylindrischen Körpers geformt, der einen hinteren Abschnitt des Griffteils 14 der Elektrowerkzeugmaschine 10 bildet.In the housing 16 are two air channels 66 (in FIGS. 2A to 3 above and below) formed, each by a housing outer wall 40 and a housing inner wall 50 are limited. When the two housing shells 16 2 are connected to one another, the housing outer wall 40 is formed as a lateral surface of a substantially cylindrical body which forms a rear section of the grip part 14 of the power tool 10.

Neben den Befestigungsvorsprüngen 46 weist jede der Gehäusehalbschalen 162 spezielle Verbindungsgeometrien auf, die eine exakte Ausrichtung der beiden Gehäuseschalen 162 zueinander bei deren Verbindung miteinander sicherstellen. So weist die untere Gehäuseschale 162 (in Figuren 2A bis 3 gezeigt) erste Ausnehmungen 54 und zweite Ausnehmungen 56 auf, in die korrespondierende, beispielsweise zapfenförmige, Vorsprünge der nichtgezeigten oberen Gehäuseschale aufgenommen werden können. Ferner sind an den ersten Ausnehmungen 54 Schraubenaufnahmen 52 ausgebildet, die konzentrisch zu den ersten Ausnehmungen 54 verlaufen und die Aufnahme von Befestigungsschrauben zur Verbindung der Gehäusehalbschalenteile 162 ermöglichen. Stirnseitig ist ferner eine Kabelausnehmung 72 in den beiden Gehäuseschalenteilen 162 vorgesehen. Durch diese kann sich bei der gezeigten Darstellungsform ein nicht dargestelltes Elektrokabel zu der Elektronikeinheit 32 erstrecken. Weiterhin sind zur Ausrichtung und Stabilisierung der Gehäuseaußenwand 40 im Verbindungsbereich der Gehäuseschalenteile 162 eine Nut 42 bzw. korrespondierende Vorsprünge (nicht dargestellt) an der jeweils anderen Gehäusehalbschale vorgesehen.In addition to the mounting bosses 46, each of the housing shells 16 2 specific compound geometries to ensure an exact alignment of the two housing shells 16 2 to each other at their connection with each other. Thus, the lower housing shell 16 2 (in FIGS. 2A to 3 shown) first recesses 54 and second recesses 56, can be added to the corresponding, for example, peg-shaped projections of the upper housing shell, not shown. Furthermore, 54 screw receptacles 52 are formed on the first recesses, which extend concentrically to the first recesses 54 and allow the inclusion of fastening screws for connecting the housing half-shell parts 16 2 . Furthermore, a cable recess 72 in the two housing shell parts 16 2 is provided on the front side. Through this, an unillustrated electric cable may extend to the electronics unit 32 in the illustrated embodiment. Furthermore, in order to align and stabilize the housing outer wall 40 in the connecting region of the housing shell parts 16 2, a groove 42 or corresponding projections (not shown) are provided on the respective other housing half shell.

Eine Besonderheit der vorliegenden Erfindung ist darin zu sehen, dass die Gehäuseinnenwände eine innere Gehäusekammer begrenzen, in der die Elektronikeinheit 32 aufgenommen ist. Bei der dargestellten Ausführungsform erstrecken sich die Gehäuseinnenwände 50 von der inneren Mantelfläche der Gehäuseaußenwand 40 nach innen, so dass diese innere Kammer für die Elektronikeinheit 32 nicht nur von den Gehäuseinnenwänden 50, sondern auch von der Gehäuseaußenwand 40 begrenzt ist. Alternativ ist es jedoch auch denkbar, dass die Gehäuseinnenwand 50 in einem montierten Zustand der Gehäuseschalen 162 ebenfalls eine umlaufende Mantelfläche bildet, die zumindest abschnittsweise von der Gehäuseaußenwand 40 umgeben ist.A special feature of the present invention is the fact that the housing inner walls define an inner housing chamber in which the electronic unit 32 is accommodated. In the illustrated embodiment, the housing inner walls 50 extend inwardly from the inner surface of the housing outer wall 40 so that this inner chamber for the electronics unit 32 is bounded not only by the housing inner walls 50 but also by the housing outer wall 40. Alternatively, it is also conceivable that the housing inner wall 50 in an assembled state of the housing shells 16 2 also forms a circumferential lateral surface which is at least partially surrounded by the housing outer wall 40.

Durch Ausbildung einer solchen inneren Gehäusekammer wird eine Kapselung der darin aufgenommenen Elektronikeinheit 32 erreicht, welche durch die umgebenden Gehäusewände davor geschützt wird, mit einem eingesogenen Luftstrom und gegebenenfalls darin enthaltenen Schmutzpartikeln in Kontakt zu gelangen. In Richtung zu dem Elektromotor 20 wird diese innere Kammer durch eine zusätzlichen Wandung 60 begrenzt, welch eine Ausnehmung 62 für die Schaltstange 30 aufweist (vgl. z.B. Figur 3).By forming such an inner housing chamber, an encapsulation of the electronic unit 32 accommodated therein is achieved, which is protected from the surrounding housing walls from coming into contact with an aspirated air flow and any dirt particles contained therein. Toward the electric motor 20, this inner chamber is bounded by an additional wall 60 which has a recess 62 for the shift rod 30 (see for example Figure 3).

Die Gehäusehalbschalen 162 wie auch der Gehäusetopf 161 können üblicherweise aus Kunststoff hergestellt sein, wobei diese beispielsweise mittels Spritzgießen hergestellt werden können. Zur Stabilisierung der Gehäuseinnenwänden 50 können dabei an diesen Stützrippen 64A und 64B angegossen sein.The housing half shells 16 2 as well as the housing pot 16 1 can usually be made of plastic, which can be prepared for example by means of injection molding. To stabilize the housing inner walls 50 may be cast on these support ribs 64A and 64B.

Die Lufteinlassöffnungen 68 sind stirnseitig in einem Endbereich des Gehäuses 16 angeordnet und werden durch den Spalt zwischen der äußeren Gehäusewand 40 und den Gehäuseinnenwänden 50 gebildet. Zur gegenseitigen Abstützung der Gehäusewände 40 und 50 und, um zu vermeiden, dass größere Schmutzpartikel in das Gehäuse 16 eingesaugt werden können, sind eine Vielzahl von Stützrippen 70 zwischen den Gehäusewänden 40 und 50 angeordnet. Diese sind im Wesentlichen parallel zueinander ausgerichtet und erstrecken sich jeweils von der Gehäuseaußenwand 40 zu der benachbarten Gehäuseinnenwand 50.The air inlet openings 68 are arranged on the front side in an end region of the housing 16 and are formed by the gap between the outer housing wall 40 and the housing inner walls 50. For mutual support of the housing walls 40 and 50 and, in order to avoid that larger dirt particles can be sucked into the housing 16, a plurality of support ribs 70 between the housing walls 40 and 50 are arranged. These are aligned substantially parallel to one another and each extend from the housing outer wall 40 to the adjacent housing inner wall 50.

Wie in den Figuren deutlich erkennbar gezeigt, ist die Gehäuseaußenwand 40 in den stirnseitigen Endbereich mit einem Vorsprung 44 gegenüber den Stützrippen 70 ausgebildet. Dieser dient dazu, selbst dann, wenn ein Anwender das Griffteil 14 der Elektrowerkzeugmaschine 10 in seinem Endbereich greift, das Risiko, dass die Lufteinlassöffnungen 68 unerwünscht von diesem mit der Hand verschlossen werden, deutlich zu minimieren.As clearly shown in the figures, the housing outer wall 40 is formed in the end-side end region with a projection 44 relative to the support ribs 70. This serves to significantly minimize the risk of the air inlet openings 68 being undesirably closed by hand, even when a user grips the grip part 14 of the power tool 10 in its end region.

Die Luftkanäle 66 erstrecken sich von der Lufteinlassöffnungen 68 zu den Kontaktierungsmitteln 28 des Elektromotors 20, die üblicherweise als Kohlebürsten ausgebildet sind, welche an einer entsprechenden Feder befestigt sind. Durch die spezielle Ausgestaltung des Luftkanals 66 wird eine gerichtete Luftzuführung zu den Komponenten des Elektromotors 20 ermöglich, der aufgrund ihres stetigen Schleifkontakts mit dem Kollektor des Elektromotors und der dabei entstehenden Reibungswärme einer besonders ausgeprägten Wärmeentwicklung unterliegen.The air channels 66 extend from the air inlet openings 68 to the contacting means 28 of the electric motor 20, which are usually formed as carbon brushes, which are secured to a corresponding spring. Due to the special design of the air duct 66, a directed air supply to the components of the electric motor 20 is possible, which are subject to a particularly pronounced heat development due to their continuous sliding contact with the collector of the electric motor and the resulting frictional heat.

Claims (9)

  1. Electric power tool (10), in particular a grinding or polishing machine, comprising a housing (16) in which a drive, a fan unit and an electronics device (32) are accommodated, it being possible for an air stream (LU) for cooling the drive to be generated with the aid of the fan unit by ambient air being drawn into the housing (16) through at least one air inlet opening (68), wherein at least one air duct (66) is formed within the housing (16), said air duct extending in the flow direction of the air stream (LU) from the air inlet opening (68) to the drive and allowing an directed supply of air to the drive, wherein the air inlet opening (68) is arranged in an end region of the electric power tool (10) which, when a workpiece is being processed with the electric power tool (10), is averted from the workpiece which is to be processed, and wherein the housing (16) is, at least in sections, of double-walled design with a housing inner wall (50) and a housing outer wall (40), which is at a distance from the said housing inner wall, wherein the air duct (66) is delimited by the housing outer wall (40) and the housing inner wall (50), and wherein the housing (16) is of multi-part design and comprises at least two half-shells (161, 162),
    characterized in that the air inlet opening (68) is formed at an end face of the housing (16) by the space between the housing outer wall (40) and the housing inner wall (50) and is delimited by the housing outer wall (40) and the housing inner wall (50).
  2. Electric power tool (10) according to Claim 1, characterized in that the electronics unit (32) is accommodated in the housing (16) in such a way that it is separated from the air duct (66) by the housing inner wall (50) at least in sections.
  3. Electric power tool (10) according to Claim 1 or 2,
    characterized in that the housing inner wall (50) at least partially delimits a substantially closed chamber which is at least partially accommodated within the housing outer wall (40).
  4. Electric power tool (10) according to one of Claims 1 to 3,
    characterized in that the housing outer wall (40) is in the form of a casing surface of a substantially cylindrical body which forms a handle part (14) of the electric power tool (10) at least in sections.
  5. Electric power tool (10) according to one of Claims 1 to 4,
    characterized in that the drive comprises an electric motor (20) having a collector and means (28) for making electrical contact with the collector, and in that the air duct (66) conducts an air stream which is directed to the means (28) for making electrical contact with the collector.
  6. Electric power tool (10) according to one of Claims 1 to 5,
    characterized in that the air inlet opening (68) has at least one, preferably a plurality of, supporting ribs (70) which are substantially parallel to one another.
  7. Electric power tool (10) according to Claim 6,
    characterized in that the supporting ribs (70) extend between the housing outer wall (40) and the housing inner wall (50) in order to support the said walls against one another.
  8. Electric power tool (10) according to either of Claims 6 and 7,
    characterized in that the housing outer wall (40) projects beyond the supporting ribs (70) at least in sections.
  9. Housing (16) of an electric power tool having the features of Claims 1 to 8.
EP11189077.8A 2011-01-13 2011-11-15 Electric machine tool, in particular a grinding or polishing machine Active EP2476520B1 (en)

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US20120184191A1 (en) 2012-07-19
CN102581768B (en) 2015-07-22
EP2476520A2 (en) 2012-07-18
CN102581768A (en) 2012-07-18
EP2476520A3 (en) 2012-08-29

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