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EP3778130B1 - Housing for an electric handheld machine tool - Google Patents

Housing for an electric handheld machine tool Download PDF

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Publication number
EP3778130B1
EP3778130B1 EP20188052.3A EP20188052A EP3778130B1 EP 3778130 B1 EP3778130 B1 EP 3778130B1 EP 20188052 A EP20188052 A EP 20188052A EP 3778130 B1 EP3778130 B1 EP 3778130B1
Authority
EP
European Patent Office
Prior art keywords
housing
air outlet
outlet opening
wall
air
Prior art date
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Active
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EP20188052.3A
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German (de)
French (fr)
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EP3778130A1 (en
Inventor
Michael Kukla
Volker Allmendinger
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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Publication date
Application filed by Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP3778130A1 publication Critical patent/EP3778130A1/en
Application granted granted Critical
Publication of EP3778130B1 publication Critical patent/EP3778130B1/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

Definitions

  • the invention relates to a housing for an electric hand tool device with at least one handle, with at least one air inlet opening and with at least one air outlet opening. Furthermore, the invention relates to an electric hand tool device with such a housing.
  • a generic housing is from DE 11 2012 004 087 T5 known.
  • the JP 2013-039652 A describes a power tool in which a grid is provided to prevent foreign bodies from entering a ventilation hole.
  • WO 2016/170119 A1 describes a hand-held power tool with a housing that has an air inlet opening for sucking in cooling air and an air outlet opening through which cooling air can flow out of the housing.
  • the JP 200006055A describes a power tool with a housing having a plurality of air inlets and a plurality of air outlets.
  • Another hand tool with air inlet and air outlet openings in the housing is from DE 101 56 387 B4 known.
  • the EP 0 794 038 A2 relates to a hand tool with a housing in which a motor, a gearbox arranged downstream of this and a fan are arranged, which draws in cooling air through at least one intake opening in the housing, directs it via the motor and the gearbox and blows it out again via at least one exhaust opening in the housing .
  • the EP 2 371 493 A1 describes a hammer drill in which air ducts are provided for cooling a motor.
  • these air outlet openings or the air exiting from them can be perceived as very annoying, for example if the air flows into an operator's face. Attempts are often made to place the air outlet in an area that is not in the immediate vicinity of the user's face or other sensitive areas when the device is in use. Due to the arrangement of the components within the housing of the electric hand tool device and the required flow of the same with the cooling air, there are limits here. In addition, no openings can be arranged in certain areas of the housing, since dirt produced there during use of the device could penetrate into the interior of the housing. This applies, for example, when working overhead with a drill.
  • the wall according to the invention which is arranged at a distance from the air outlet opening in the direction of flow of the air, results in a turbulence of the air, which prevents the formation of straight, disruptive air jets, so that there is less disruption for the user and more options in terms of air outlet positioning.
  • the wall acts as a kind of diffuser that swirls the air so that it is discharged in different directions.
  • a further advantage of the wall according to the invention is that any particles carried along with the air exiting from the air outlet opening hit the wall and are slowed down as a result and thus pose less danger to the user.
  • a very good integration of the wall into the housing is achieved in that the wall is connected to the housing at two connection areas. In this way, a high durability of the wall and the entire housing is also achieved.
  • the air outlet opening and the wall are arranged on the side of the housing opposite the handle. At this location, any other disadvantages related to the positioning of the air outlet opening can also be avoided.
  • the wall has a distance of 2 to 15 mm from the air outlet opening. Such a distance between the wall and the outlet opening has proven to be very advantageous with regard to generating a diffuse air flow.
  • the size of the wall can be minimized. In this case, part of the exiting air may not hit the wall directly, but this is not relevant if the air outlet opening is in an area that cannot lead to a disturbance for the user.
  • Claim 6 specifies an electric hand tool device with a housing according to the invention.
  • Such an electric hand tool can make particularly good use of the advantages mentioned above for the housing according to the invention, with good flow through the housing and good flow to the components of the electric hand tool accommodated in the same being provided at the same time.
  • FIG 1 shows a side view of an electric hand tool 1, in the present case a drill or a hammer drill.
  • the electric hand tool device 1 has a housing 2 in which the essential components of the electric hand tool device 1 are accommodated.
  • a drive device 3 which can be embodied as an electric motor, for example, is used to drive a tool 6 that is accommodated in a chuck 7 of the electric hand tool device 1 .
  • a ventilation device 9 is arranged in the housing 2 , which can be driven by the drive device 3 , for example, and which is used to generate an air flow within the housing 2 .
  • the ventilation device 9 can be designed as a fan wheel or have a fan wheel.
  • the same has an air inlet opening 10 and an air outlet opening 11. While the air inlet opening 10 is provided on an underside of the housing 2 in the present case, the air outlet opening 11 is located on a side of the housing 2 opposite a handle 12 of the housing 2.
  • the handle 12 is used to hold the electric hand-held power tool 1 and cannot be described in more detail for this purpose Have controls, such as an on and off switch.
  • both the air inlet opening 10 and the air outlet opening 11 can be located at other positions on the housing 2 .
  • the position of the air inlet opening 10 and the air outlet opening 11 depend in particular on the positioning of the drive device 3 and the control electronics 5 within the housing 2, which are to be cooled by the air flow.
  • a distance from the air outlet opening 11 having wall 13 is arranged.
  • the wall 13 arranged outside of the housing 2, which can also be referred to as a baffle, is subjected to the air emerging from the air outlet opening 11 and distributes it so that a sharp, directed jet of air is prevented from emerging from the air outlet opening 11. Instead, there is a diffuse air flow that is not perceived as disturbing by the user.
  • the wall 13 is at a distance of 2 to 15 mm, in particular 4 to 10 mm, from the air outlet opening 11 .
  • the exact distance of the wall 13 from the air outlet opening 11 depends, among other things, on the strength of the air flow emerging from the air outlet opening 11 and on the size of the electric hand tool device 1 . For example, with a stronger air flow and/or a larger electric hand tool device 1, the distance between the wall 13 and the air outlet opening 11 would tend to be greater than with a weaker air flow or a smaller electric hand tool device 1.
  • the wall 13 is connected to the housing 2 at two connection areas, namely an upper and a lower connection area.
  • the wall 13 is preferably formed in one piece with the housing and is already taken into account in the injection mold, for example if the housing 2 is produced by injection molding.
  • the air outlet opening 11 is provided on the side of the housing 2 opposite the handle 12 .
  • the wall 13 is also provided on the side of the housing 2 opposite the handle 12 . This arrangement of the wall 13 prevents the air emerging from the air outlet opening 11 from flowing directly onto the hand of the user using the electric hand tool device 1 and being able to disturb him. Since a hammer drill is often used at head level, this also prevents the air flow from directly impinging on the user's face.
  • the wall 13 can be arranged in front of the complete air outlet opening 11 .
  • a partial area of the air outlet opening 11 is free of the wall 13 , ie the wall 13 is not located in front of a partial area of the air outlet opening 11 .
  • the wall 13 is arranged in the present case in front of a central partial area 11a of the air outlet opening 11 and that two lateral partial areas 11b of the air outlet opening 11 are free of the wall 13, ie that the wall 13 is not arranged in front of the lateral partial areas 11b .
  • the air outlet opening 11 is formed from a large number of individual openings. Nevertheless, an air outlet opening 11 is mentioned here.
  • the individual openings in the lateral areas 11b of the air outlet opening 11 can, for example, have a smaller cross section than those in the central area 11a, so that the air flowing out of the lateral areas 11b is not regarded as disturbing.

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

Description

Die Erfindung betrifft ein Gehäuse für ein Elektrohandwerkzeuggerät mit wenigstens einem Handgriff, mit wenigstens einer Lufteinlassöffnung und mit wenigstens einer Luftauslassöffnung. Des Weiteren betrifft die Erfindung ein Elektrohandwerkzeuggerät mit einem solchen Gehäuse.The invention relates to a housing for an electric hand tool device with at least one handle, with at least one air inlet opening and with at least one air outlet opening. Furthermore, the invention relates to an electric hand tool device with such a housing.

Ein gattungsgemäßes Gehäuse ist aus der DE 11 2012 004 087 T5 bekannt.A generic housing is from DE 11 2012 004 087 T5 known.

Die JP 2013-039652 A beschreibt ein Elektrowerkzeug, bei dem zur Verhinderung des Eindringens von Fremdkörpern in eine Lüftungsbohrung ein Gitter vorgesehen ist.The JP 2013-039652 A describes a power tool in which a grid is provided to prevent foreign bodies from entering a ventilation hole.

In der WO 2016/170119 A1 ist eine Handwerkzeugmaschine mit einem Gehäuse beschrieben, das eine Lufteinlassöffnung zum Ansaugen von Kühlluft und eine Luftauslassöffnung, über die Kühlluft aus dem Gehäuse abströmen kann, aufweist.In the WO 2016/170119 A1 describes a hand-held power tool with a housing that has an air inlet opening for sucking in cooling air and an air outlet opening through which cooling air can flow out of the housing.

Die JP 200006055 A beschreibt ein Elektrowerkzeug mit einem mehrere Lufteinlässe und mehrere Luftauslässe aufweisenden Gehäuse.The JP 200006055A describes a power tool with a housing having a plurality of air inlets and a plurality of air outlets.

Eine weitere Handwerkzeugmaschine mit Lufteintritts- und Luftaustrittsöffnungen im Gehäuse ist aus der DE 101 56 387 B4 bekannt.Another hand tool with air inlet and air outlet openings in the housing is from DE 101 56 387 B4 known.

Die EP 0 794 038 A2 betrifft ein Handwerkzeug mit einem Gehäuse, in dem ein Motor, ein diesem nachgeordnetes Getriebe und ein Lüfter angeordnet sind, der Kühlluft durch wenigstens eine Ansaugöffnung in dem Gehäuse ansaugt, über den Motor und das Getriebe leitet und über wenigstens eine Ausblasöffnung in dem Gehäuse wieder ausbläst.The EP 0 794 038 A2 relates to a hand tool with a housing in which a motor, a gearbox arranged downstream of this and a fan are arranged, which draws in cooling air through at least one intake opening in the housing, directs it via the motor and the gearbox and blows it out again via at least one exhaust opening in the housing .

Die EP 2 371 493 A1 beschreibt einen Bohrhammer, bei dem zur Kühlung eines Motors Luftkanäle vorgesehen sind.The EP 2 371 493 A1 describes a hammer drill in which air ducts are provided for cooling a motor.

Weitere ähnliche Elektrowerkzeuge sind in der JP 2017-144523 A1 und der JP 2017-226025 A beschrieben.Other similar power tools are in the JP 2017-144523 A1 and the JP 2017-226025 A described.

Je nach Bauform des Geräts können diese Luftauslassöffnungen bzw. die aus denselben austretende Luft als sehr störend empfunden werden, beispielsweise wenn die Luft einer Bedienperson ins Gesicht strömt. Häufig wird versucht, die Luftauslassöffnung in einen Bereich zu legen, der sich bei der Benutzung des Geräts nicht unmittelbar in der Nähe des Gesichts oder anderer empfindlicher Stellen des Benutzers befindet. Aufgrund der Anordnung der Bauteile innerhalb des Gehäuses des Elektrohandwerkzeuggeräts und der erforderlichen Anströmung derselben mit der Kühlluft sind hier jedoch Grenzen gesetzt. Hinzu kommt, dass in bestimmten Bereichen des Gehäuses keine Öffnungen angeordnet werden können, da dort bei der Benutzung des Geräts entstehender Schmutz in das Innere des Gehäuses eindringen könnte. Dies gilt beispielsweise, wenn mit einer Bohrmaschine über Kopf gearbeitet wird.Depending on the design of the device, these air outlet openings or the air exiting from them can be perceived as very annoying, for example if the air flows into an operator's face. Attempts are often made to place the air outlet in an area that is not in the immediate vicinity of the user's face or other sensitive areas when the device is in use. Due to the arrangement of the components within the housing of the electric hand tool device and the required flow of the same with the cooling air, there are limits here. In addition, no openings can be arranged in certain areas of the housing, since dirt produced there during use of the device could penetrate into the interior of the housing. This applies, for example, when working overhead with a drill.

Des Weiteren kann es, beispielsweise wenn über die Lufteinlassöffnung Partikel eingesaugt werden, dazu kommen, dass diese durch die Luftauslassöffnung herausgeschleudert werden, was für einen Benutzer ebenfalls unangenehm sein kann.Furthermore, if particles are sucked in via the air inlet opening, for example, it can happen that these are thrown out through the air outlet opening, which can also be uncomfortable for a user.

Es ist daher Aufgabe der vorliegenden Erfindung, ein Gehäuse für ein Elektrohandwerkzeuggerät sowie ein entsprechendes Elektrohandwerkzeuggerät zu schaffen, bei denen eine Störung für einen Benutzer durch aus einer Luftauslassöffnung des Gehäuses austretender Luft vermieden wird.It is therefore the object of the present invention to create a housing for an electric hand tool device and a corresponding electric hand tool device in which a disturbance to a user due to air escaping from an air outlet opening of the housing is avoided.

Erfindungsgemäß wird diese Aufgabe durch die in Anspruch 1 genannten Merkmale gelöst.According to the invention, this object is achieved by the features mentioned in claim 1.

Durch die erfindungsgemäße, in Strömungsrichtung der aus der Luftauslassöffnung austretenden Luft mit einem Abstand von derselben angeordnete Wandung ergibt sich eine Verwirbelung der Luft, was die Entstehung von geradlinigen, störenden Luftstrahlen verhindert, so dass eine geringere Störung für den Benutzer gegeben ist und mehr Optionen im Hinblick auf die Positionierung der Luftauslassöffnung vorhanden sind. Die Wandung wirkt dabei als eine Art Diffusor, der die Luft so verwirbelt, dass diese in unterschiedliche Richtungen abgeführt wird.The wall according to the invention, which is arranged at a distance from the air outlet opening in the direction of flow of the air, results in a turbulence of the air, which prevents the formation of straight, disruptive air jets, so that there is less disruption for the user and more options in terms of air outlet positioning. The wall acts as a kind of diffuser that swirls the air so that it is discharged in different directions.

Ein weiterer Vorteil der erfindungsgemäßen Wandung besteht darin, dass eventuell mit der aus der Luftauslassöffnung austretenden Luft mitgeführte Partikel auf die Wandung treffen und dadurch abgebremst werden und somit eine geringere Gefahr für den Benutzer darstellen.A further advantage of the wall according to the invention is that any particles carried along with the air exiting from the air outlet opening hit the wall and are slowed down as a result and thus pose less danger to the user.

Eine sehr gute Integration der Wandung in das Gehäuse wird dadurch erreicht, dass die Wandung an zwei Verbindungsbereichen mit dem Gehäuse verbunden ist. Auf diese Weise wird außerdem eine hohe Dauerhaltbarkeit der Wandung und des gesamten Gehäuses erreicht.A very good integration of the wall into the housing is achieved in that the wall is connected to the housing at two connection areas. In this way, a high durability of the wall and the entire housing is also achieved.

Dadurch, dass die Wandung einteilig mit dem Gehäuse ausgebildet ist, ergibt sich eine besonders einfache Herstellung des Gehäuses.The fact that the wall is designed in one piece with the housing results in a particularly simple manufacture of the housing.

Im Hinblick auf eine gute Durchströmung des Gehäuses mit Kühlluft ist des Weiteren vorgesehen, dass die Luftauslassöffnung und die Wandung auf der dem Handgriff gegenüberliegenden Seite des Gehäuses angeordnet sind. An diesem Ort können außerdem eventuelle andere Nachteile hinsichtlich der Positionierung der Luftauslassöffnung vermieden werden.With regard to a good flow of cooling air through the housing, it is also provided that the air outlet opening and the wall are arranged on the side of the housing opposite the handle. At this location, any other disadvantages related to the positioning of the air outlet opening can also be avoided.

In einer sehr vorteilhaften Weiterbildung der Erfindung kann vorgesehen sein, dass die Wandung einen Abstand von 2 bis 15 mm von der Luftauslassöffnung aufweist. Ein solcher Abstand der Wandung von der Auslassöffnung hat sich im Hinblick auf das Erzeugen einer diffusen Luftströmung als sehr vorteilhaft erwiesen.In a very advantageous development of the invention, it can be provided that the wall has a distance of 2 to 15 mm from the air outlet opening. Such a distance between the wall and the outlet opening has proven to be very advantageous with regard to generating a diffuse air flow.

Noch bessere Ergebnisse im Hinblick auf die Verwirbelung bzw. Umlenkung der Luft können erzielt werden, wenn die Wandung einen Abstand von 4 bis 10 mm von der Luftauslassöffnung aufweist.Even better results with regard to the turbulence or deflection of the air can be achieved if the wall is at a distance of 4 to 10 mm from the air outlet opening.

Wenn des Weiteren wenigstens ein Teilbereich der Luftauslassöffnung frei von der Wandung ist, so kann die Größe der Wandung minimiert werden. Dabei kann möglicherweise ein Teil der austretenden Luft nicht direkt auf die Wandung treffen, was jedoch dann nicht relevant ist, wenn sich die Luftauslassöffnung in einem Bereich befindet, der nicht zu einer Störung für den Benutzer führen kann.Furthermore, if at least a partial area of the air outlet opening is free of the wall, the size of the wall can be minimized. In this case, part of the exiting air may not hit the wall directly, but this is not relevant if the air outlet opening is in an area that cannot lead to a disturbance for the user.

Dies gilt beispielsweise, wenn die Wandung vor einem mittleren Teilbereich der Luftauslassöffnung angeordnet ist und zwei seitliche Teilbereiche der Luftauslassöffnung frei von der Wandung sind.This applies, for example, when the wall is arranged in front of a central partial area of the air outlet opening and two lateral partial areas of the air outlet opening are free of the wall.

In Anspruch 6 ist ein Elektrohandwerkzeuggerät mit einem erfindungsgemäßen Gehäuse angegeben.Claim 6 specifies an electric hand tool device with a housing according to the invention.

Ein solches Elektrohandwerkzeuggerät kann die für das erfindungsgemäße Gehäuse oben genannten Vorteile besonders gut nutzen, wobei gleichzeitig eine gute Durchströmung des Gehäuses und eine gute Anströmung der in demselben untergebrachten Komponenten des Elektrohandwerkzeuggeräts gegeben sind.Such an electric hand tool can make particularly good use of the advantages mentioned above for the housing according to the invention, with good flow through the housing and good flow to the components of the electric hand tool accommodated in the same being provided at the same time.

Diese Vorteile kommen insbesondere dann zum Tragen, wenn das Elektrohandwerkzeuggerät als Bohrmaschine, insbesondere als Bohrhammer, ausgebildet ist.These advantages come into play in particular when the electric hand tool device is designed as a drill, in particular as a hammer drill.

Ergänzend sei darauf hingewiesen, dass Begriffe, wie "umfassend" "aufweisen" oder "mit" keine anderen Merkmale oder Schritte ausschließen. Ferner schließen Begriffe "ein" oder "das", die auf einer Einzahl von Schritten oder Merkmalen hinweisen, keine Mehrzahl von Merkmalen oder Schritten aus und umgekehrt.In addition, it should be pointed out that terms such as "comprising", "having" or "with" do not exclude any other features or steps. Furthermore, terms "a" or "the" indicating a singular number of features or features do not exclude a plurality of features or steps, and vice versa.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels der Erfindung. Die Figuren zeigen mehrere Merkmale der Erfindung in Kombination miteinander. Selbstverständlich vermag der Fachmann diese jedoch auch losgelöst voneinander zu betrachten und gegebenenfalls zu weiteren sinnvollen Unterkombinationen zu kombinieren, ohne dass hierfür erfinderisch tätig werden zu müssen.Further features and advantages of the invention result from the following description of an exemplary embodiment of the invention. The figures show several features of the invention in combination with one another. Of course, the person skilled in the art can also consider these separately from one another and, if necessary, combine them to form further meaningful sub-combinations without having to be inventive.

Es zeigen schematisch:

Figur 1
eine Seitenansicht eines erfindungsgemäßen Elektrohandwerkzeuggeräts mit einem erfindungsgemäßen Gehäuse; und
Figur 2
eine sehr schematische Ansicht gemäß dem Pfeil II aus Figur 1.
They show schematically:
figure 1
a side view of an electric hand tool device according to the invention with a housing according to the invention; and
figure 2
a very schematic view according to arrow II figure 1 .

Figur 1 zeigt eine Seitenansicht eines Elektrohandwerkzeuggeräts 1, im vorliegenden Fall einer Bohrmaschine bzw. eines Bohrhammers. Das Elektrohandwerkzeuggerät 1 weist ein Gehäuse 2 auf, in dem die wesentlichen Komponenten des Elektrohandwerkzeuggeräts 1 untergebracht sind. Im vorliegenden Fall sind innerhalb des Gehäuses 2, jeweils mittels gestrichelter Linien dargestellt, eine Antriebseinrichtung 3, ein Getriebe 4 und eine Steuerungselektronik 5 angeordnet. Die Antriebseinrichtung 3, die beispielsweise als Elektromotor ausgebildet sein kann, dient zum Antrieb eines Werkzeugs 6, das in einem Spannfutter 7 des Elektrohandwerkzeuggeräts 1 aufgenommen ist. Zur Stromversorgung der Antriebseinrichtung 3 und der Steuerungselektronik 5 dient ein Akku 8, der in an sich bekannter Weise mit dem Gehäuse 2 verbunden sein kann. figure 1 shows a side view of an electric hand tool 1, in the present case a drill or a hammer drill. The electric hand tool device 1 has a housing 2 in which the essential components of the electric hand tool device 1 are accommodated. In the present case, a drive device 3, a gear 4 and control electronics 5 are arranged within the housing 2, each represented by dashed lines. The drive device 3 , which can be embodied as an electric motor, for example, is used to drive a tool 6 that is accommodated in a chuck 7 of the electric hand tool device 1 . A rechargeable battery 8, which can be connected to the housing 2 in a manner known per se, serves to supply power to the drive device 3 and the control electronics 5.

In dem Gehäuse 2 ist des Weiteren eine Lüftungseinrichtung 9 angeordnet, die beispielsweise von der Antriebseinrichtung 3 angetrieben werden kann und die zur Erzeugung eines Luftstroms innerhalb des Gehäuses 2 dient. Beispielsweise kann die Lüftungseinrichtung 9 als Lüfterrad ausgebildet sein bzw. ein Lüfterrad aufweisen. Um den Luftstrom innerhalb des Gehäuses 2 zu ermöglichen, weist dasselbe eine Lufteinlassöffnung 10 und eine Luftauslassöffnung 11 auf. Während die Lufteinlassöffnung 10 im vorliegenden Fall an einer Unterseite des Gehäuses 2 vorgesehen ist, befindet sich die Luftauslassöffnung 11 auf einer einem Handgriff 12 des Gehäuses 2 gegenüberliegenden Seite des Gehäuses 2. Der Handgriff 12 dient zum Halten des Elektrohandwerkzeuggeräts 1 und kann hierzu nicht näher bezeichnete Bedienelemente, wie beispielsweise einen Ein- und Ausschalter, aufweisen.Furthermore, a ventilation device 9 is arranged in the housing 2 , which can be driven by the drive device 3 , for example, and which is used to generate an air flow within the housing 2 . For example, the ventilation device 9 can be designed as a fan wheel or have a fan wheel. In order to enable the air flow within the housing 2, the same has an air inlet opening 10 and an air outlet opening 11. While the air inlet opening 10 is provided on an underside of the housing 2 in the present case, the air outlet opening 11 is located on a side of the housing 2 opposite a handle 12 of the housing 2. The handle 12 is used to hold the electric hand-held power tool 1 and cannot be described in more detail for this purpose Have controls, such as an on and off switch.

Selbstverständlich können sich sowohl die Lufteinlassöffnung 10 als auch die Luftauslassöffnung 11 an anderen Positionen des Gehäuses 2 befinden. Die Position der Lufteinlassöffnung 10 und der Luftauslassöffnung 11 hängen insbesondere von der Positionierung der Antriebseinrichtung 3 und der Steuerungselektronik 5 innerhalb des Gehäuses 2 ab, die durch den Luftstrom gekühlt werden sollen.Of course, both the air inlet opening 10 and the air outlet opening 11 can be located at other positions on the housing 2 . The position of the air inlet opening 10 and the air outlet opening 11 depend in particular on the positioning of the drive device 3 and the control electronics 5 within the housing 2, which are to be cooled by the air flow.

Um zu verhindern, dass die aus der Luftauslassöffnung 11 austretende Luft eine Störung für einen Benutzer des Elektrohandwerkzeuggeräts 1 darstellt, ist in der mit "x" bezeichneten Strömungsrichtung der aus der Luftauslassöffnung 11 austretenden Luft nach zumindest einem Teilbereich der Luftauslassöffnung 11 eine zur Verwirbelung der aus der Luftauslassöffnung 11 austretenden Luft dienende, einen Abstand von der Luftauslassöffnung 11 aufweisende Wandung 13 angeordnet. Die außerhalb des Gehäuses 2 angeordnete Wandung 13, die auch als Prallwand bezeichnet werden kann, wird von der aus der Luftauslassöffnung 11 austretenden Luft angeströmt und verteilt diese, so dass das Austreten eines scharfen, gerichteten Luftstrahls aus der Luftauslassöffnung 11 verhindert wird. Stattdessen ergibt sich eine diffuse Luftströmung, die von dem Benutzer als nicht störend empfunden wird.In order to prevent the air exiting from the air outlet opening 11 from posing a problem for a user of the electric hand-held power tool 1, in the direction of flow of the air exiting from the air outlet opening 11 labeled "x", there is a flow direction after at least a partial area of the air outlet opening 11 for turbulence of the out the air outlet opening 11 exiting air serving, a distance from the air outlet opening 11 having wall 13 is arranged. The wall 13 arranged outside of the housing 2, which can also be referred to as a baffle, is subjected to the air emerging from the air outlet opening 11 and distributes it so that a sharp, directed jet of air is prevented from emerging from the air outlet opening 11. Instead, there is a diffuse air flow that is not perceived as disturbing by the user.

Die Wandung 13 weist im vorliegenden Fall einen Abstand von 2 bis 15 mm, insbesondere 4 bis 10 mm, von der Luftauslassöffnung 11 auf. Der genaue Abstand der Wandung 13 von der Luftauslassöffnung 11 hängt unter anderem von der Stärke des aus der Luftauslassöffnung 11 austretenden Luftstroms und von der Größe des Elektrohandwerkzeuggeräts 1 ab. Beispielsweise wäre bei einem stärkeren Luftstrom und/oder einem größeren Elektrohandwerkzeuggerät 1 der Abstand der Wandung 13 von der Luftauslassöffnung 11 tendenziell größer als bei einem schwächeren Luftstrom bzw. einem kleineren Elektrohandwerkzeuggerät 1.In the present case, the wall 13 is at a distance of 2 to 15 mm, in particular 4 to 10 mm, from the air outlet opening 11 . The exact distance of the wall 13 from the air outlet opening 11 depends, among other things, on the strength of the air flow emerging from the air outlet opening 11 and on the size of the electric hand tool device 1 . For example, with a stronger air flow and/or a larger electric hand tool device 1, the distance between the wall 13 and the air outlet opening 11 would tend to be greater than with a weaker air flow or a smaller electric hand tool device 1.

Im dargestellten Ausführungsbeispiel ist die Wandung 13 an zwei Verbindungsbereichen, nämlich einem oberen und einem unteren Verbindungsbereich, mit dem Gehäuse 2 verbunden. Vorzugsweise ist die Wandung 13 einteilig mit dem Gehäuse ausgebildet und wird, beispielsweise wenn das Gehäuse 2 mittels Spritzgießen hergestellt wird, bereits in der Spritzgießform berücksichtigt.In the exemplary embodiment shown, the wall 13 is connected to the housing 2 at two connection areas, namely an upper and a lower connection area. The wall 13 is preferably formed in one piece with the housing and is already taken into account in the injection mold, for example if the housing 2 is produced by injection molding.

Wie bereits erwähnt, ist die Luftauslassöffnung 11 auf der dem Handgriff 12 gegenüberliegenden Seite des Gehäuses 2 vorgesehen. Selbstverständlich ist dadurch auch die Wandung 13 auf der dem Handgriff 12 gegenüberliegenden Seite des Gehäuses 2 vorgesehen. Durch diese Anordnung der Wandung 13 wird verhindert, dass die aus der Luftauslassöffnung 11 austretende Luft direkt auf die Hand des das Elektrohandwerkzeuggerät 1 verwendenden Benutzers strömen und diesen stören kann. Da ein Bohrhammer häufig in Kopfhöhe verwendet wird, kann auf diese Weise auch eine direkte Beaufschlagung des Gesichts des Benutzers durch die Luftströmung verhindert werden.As already mentioned, the air outlet opening 11 is provided on the side of the housing 2 opposite the handle 12 . As a result, of course, the wall 13 is also provided on the side of the housing 2 opposite the handle 12 . This arrangement of the wall 13 prevents the air emerging from the air outlet opening 11 from flowing directly onto the hand of the user using the electric hand tool device 1 and being able to disturb him. Since a hammer drill is often used at head level, this also prevents the air flow from directly impinging on the user's face.

Grundsätzlich kann die Wandung 13 vor der kompletten Luftauslassöffnung 11 angeordnet sein. Im vorliegenden Fall ist jedoch ein Teilbereich der Luftauslassöffnung 11 frei von der Wandung 13, d. h. vor einem Teilbereiche der Luftauslassöffnung 11 befindet sich die Wandung 13 nicht. In der sehr schematischen Darstellung von Figur 2 ist erkennbar, dass die Wandung 13 im vorliegenden Fall vor einem mittleren Teilbereich 11a der Luftauslassöffnung 11 angeordnet ist und dass zwei seitliche Teilbereiche 11b der Luftauslassöffnung 11 frei von der Wandung 13 sind, d. h. dass die Wandung 13 vor den seitlichen Teilbereichen 11b gerade nicht angeordnet ist. In Figur 2 ist außerdem zu erkennen, dass die Luftauslassöffnung 11 aus einer Vielzahl einzelner Öffnungen gebildet ist. Dennoch wird hierin von einer Luftauslassöffnung 11 gesprochen. Die einzelnen Öffnungen in den seitlichen Bereichen 11b der Luftauslassöffnung 11 können beispielsweise einen kleineren Querschnitt aufweisen als diejenigen in dem mittleren Bereich 11a, sodass die aus den seitlichen Bereichen 11b ausströmende Luft als nicht störend angesehen wird.In principle, the wall 13 can be arranged in front of the complete air outlet opening 11 . In the present case, however, a partial area of the air outlet opening 11 is free of the wall 13 , ie the wall 13 is not located in front of a partial area of the air outlet opening 11 . In the very schematic representation of figure 2 it can be seen that the wall 13 is arranged in the present case in front of a central partial area 11a of the air outlet opening 11 and that two lateral partial areas 11b of the air outlet opening 11 are free of the wall 13, ie that the wall 13 is not arranged in front of the lateral partial areas 11b . It can also be seen in FIG. 2 that the air outlet opening 11 is formed from a large number of individual openings. Nevertheless, an air outlet opening 11 is mentioned here. The individual openings in the lateral areas 11b of the air outlet opening 11 can, for example, have a smaller cross section than those in the central area 11a, so that the air flowing out of the lateral areas 11b is not regarded as disturbing.

Claims (7)

  1. Housing (2) for an electric handheld machine tool (1) having at least one handle (12), at least one air inlet opening (10) and at least one air outlet opening (11), wherein a wall (13) serving to swirl the air emerging from the air outlet opening (11) and having a spacing from the air outlet opening (11) is arranged in the direction of flow (x) of the air emerging from the air outlet opening (11) downstream of at least a partial region of the air outlet opening (11),
    characterised in that the wall (13) is arranged outside the housing (2) and is connected to the housing (2) at two connecting regions, in that the wall (13) is formed in one piece with the housing (2), and in that the air outlet opening (11) and the wall (13) are arranged on the side of the housing (2) opposite the handle (12).
  2. Housing according to claim 1,
    characterised in that the wall (13) has a distance of 2 to 15 mm from the air outlet opening (11).
  3. Housing according to claim 2,
    characterised in that the wall (13) has a distance of 4 to 10 mm from the air outlet opening (11).
  4. Housing according to one of the claims 1 to 3,
    characterised in that at least a partial region (11b) of the air outlet opening (11) is free of the wall (13).
  5. Housing according to claim 4,
    characterised in that the wall (13) is arranged in front of a central portion (11a) of the air outlet opening (11), and in that two lateral portions (11b) of the air outlet opening (11) are free of the wall (13).
  6. Electric handheld machine tool (1) having a housing (2) according to one of claims 1 to 5, a drive device (3) arranged in the housing (2) for driving a tool (6) and a ventilation device (9) arranged in the housing (2) for generating an air flow
  7. Electric handheld machine tool according to claim 6,
    characterised in that it is designed as a drilling machine, in particular as a hammer drill.
EP20188052.3A 2019-08-12 2020-07-28 Housing for an electric handheld machine tool Active EP3778130B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019121699.0A DE102019121699B4 (en) 2019-08-12 2019-08-12 Housing for an electric hand tool

Publications (2)

Publication Number Publication Date
EP3778130A1 EP3778130A1 (en) 2021-02-17
EP3778130B1 true EP3778130B1 (en) 2023-02-15

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EP20188052.3A Active EP3778130B1 (en) 2019-08-12 2020-07-28 Housing for an electric handheld machine tool

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DE (1) DE102019121699B4 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021211950A1 (en) 2021-10-22 2023-04-27 Robert Bosch Gesellschaft mit beschränkter Haftung Housing device for a hand-held power tool and hand-held power tool with the housing device

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849066A (en) * 1981-09-17 1983-03-23 Toshiba Corp Venting filter unit for rotary electric machine
EP0794038B1 (en) * 1996-01-08 1998-11-04 Kress-elektrik GmbH + Co. Elektromotorenfabrik Hand tool with cooling arrangement
JP2000006055A (en) 1998-06-19 2000-01-11 Hitachi Koki Co Ltd Electric tool
DE19839963A1 (en) * 1998-09-02 2000-03-09 Hilti Ag Power tool
DE19924552A1 (en) * 1999-05-28 2000-11-30 Hilti Ag Electrically powered hand device e.g. electric screwdriver, has cooling air channel arranged downstream of electric motor and gearbox with outflow openings arranged to direct heated air away from user
DE10156387B8 (en) 2001-11-16 2008-07-24 Robert Bosch Gmbh Hand tool with air inlet or air outlet openings in the housing
DE102007039828B3 (en) * 2007-08-23 2008-11-20 Robert Bosch Gmbh Electric hand-held machine tool, particularly hammer drill, has housing, in which motor is arranged and blower is coupled to motor and has extendable and retractable accumulators over guide rails
DE102008041370A1 (en) * 2008-08-20 2010-02-25 Robert Bosch Gmbh power tool
JP5416397B2 (en) * 2008-12-19 2014-02-12 株式会社マキタ Work tools
DE102010012022A1 (en) * 2010-03-19 2011-09-22 Festool Gmbh Hand tool machine with a handle
JP5725354B2 (en) 2011-08-19 2015-05-27 日立工機株式会社 Electric tool
JP2013075351A (en) 2011-09-30 2013-04-25 Hitachi Koki Co Ltd Electric tool
EP3085498A1 (en) 2015-04-24 2016-10-26 HILTI Aktiengesellschaft Manual machine tool
JP6812111B2 (en) 2016-02-18 2021-01-13 株式会社マキタ Rotating tool
JP2017226025A (en) 2016-06-20 2017-12-28 日立工機株式会社 Electric tool

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Publication number Publication date
DE102019121699A1 (en) 2021-02-18
EP3778130A1 (en) 2021-02-17
DE102019121699B4 (en) 2023-02-16

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