EP1800806B1 - Portable electric tool - Google Patents
Portable electric tool Download PDFInfo
- Publication number
- EP1800806B1 EP1800806B1 EP20060125302 EP06125302A EP1800806B1 EP 1800806 B1 EP1800806 B1 EP 1800806B1 EP 20060125302 EP20060125302 EP 20060125302 EP 06125302 A EP06125302 A EP 06125302A EP 1800806 B1 EP1800806 B1 EP 1800806B1
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- EP
- European Patent Office
- Prior art keywords
- coolant
- coolant channel
- volume
- electric tool
- portable electric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 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 portable power tool, in particular a portable diamond core drilling, referred to in the preamble of claim 1.
- a portable power tool in particular a portable diamond core drilling, referred to in the preamble of claim 1.
- a fan means such as a fan is provided which sucks ambient air via inlet openings in the housing and blows out the heated air from the drive via outlet openings.
- fan means require power, which reduces the performance of the portable power tool.
- a sufficient cooling of the drive in a longer uninterrupted use of the portable power tool is not always guaranteed.
- a portable power tool with a housing and a drive arranged in the housing which has a coolant channel for cooling the drive.
- Water is used as the coolant, which is supplied to the cooling channel via a feed line through an inlet opening communicating with the coolant channel.
- an outlet opening for discharging the heated coolant from the coolant channel which is passed for example by a drill as rinse water in the borehole or discharged via a drain and z.
- B recycled is returned to the power tool for cooling the drive.
- This portable power tool has a so-called open coolant circuit.
- a disadvantage of the known solution is that at a risk of frost, z. B. due to low temperatures of the ambient air, which can still freeze in a power cut located in the power tool coolant and therefore removed from the power tool, z. B. must be evacuated. This happens partly over gravity, for example, by opening a drain plug. However, most of the coolant still in the power tool must be removed by blowing it out of the power tool.
- the object of the invention is to provide a portable power tool in which the harmful effects of increasing in volume coolant are prevented on the power tool.
- At least one volume compensation means is provided for the coolant channel.
- volume compensation means provided on the coolant channel, it is also possible to compensate for an abrupt increase in volume of the coolant in the coolant channel, as occurs, for example, in the case of freezing water.
- the volume made available by the volume compensation means for the expanding coolant is selected such that when the coolant expands no high forces can be produced on the individual components and / or seals. Even if the user fails to completely empty the coolant from the power tool, for example, to evacuate, there are no harmful effects on the power tool.
- the inventive solution is particularly advantageous in a power tool with an open coolant circuit. But even with a power tool with a closed coolant circuit, the arrangement of a volume compensation means for the coolant channel is advantageous because in this solution to special coolant or antifreeze offset coolant, which until now in closed coolant circuits application found, can be waived.
- the special or anti-freeze coolants are more expensive than simple coolants and some are not particularly environmentally friendly.
- the volume compensation means preferably includes a compensation chamber, which is sealed in a liquid-tight manner with respect to the coolant channel by means of an elastic membrane.
- the refrigerant may expand upon freezing, compressing the trapped air in the expansion space.
- the elastic membrane expands during thawing of the coolant by their elasticity again, so that this volume compensation means is available for a further freezing access.
- the elastic membrane is made, for example, from an elastomer, in particular from a silicone mat, or from a rubber (eg NBR, EPDM).
- the elastic volume compensation means is formed by an elastically deformable insert, which is arranged in a receiving space communicating with the coolant channel.
- the refrigerant can expand during freezing, wherein the elastically deformable insert is compressed.
- the elastic insert expands during the thawing of the coolant by its elasticity back to the existing before compression expansion, so that this volume compensation means is available for a further freezing access.
- the receiving space for the elastically deformable insert is advantageously formed as a depression on a wall forming the coolant channel wall portion.
- the elastically deformable insert part is fixed to the bottom of the receiving space by means of an adhesive for securing the same, for example.
- the elastically deformable insert is made, for example, from a closed-cell foam, preferably from a PUR foam.
- the volume compensation means includes a spring-loaded piston which is arranged in a receiving space communicating with the coolant channel.
- a spring force for example a helical spring
- the piston is brought back into its starting position by means of the acting spring force, so that this volume compensation means is available for a further freezing access.
- the piston advantageously has a radially arranged around this seal, for example, a relative to the coolant resistant rubber sealingly with the wall of the receiving space in Plant stands and prevents penetration of the coolant into the receiving space behind the piston.
- a stop for the piston is advantageously provided which limits its travel from the receiving space out.
- the receiving space for the spring-loaded piston is advantageously formed as a depression on a wall forming the coolant channel wall portion.
- the volume compensation means is formed by an elastically deformable portion of the housing, which forms a wall portion of the coolant channel.
- the elastically deformable portion of the housing With an increase in the volume of the coolant, the elastically deformable portion of the housing is bulged, whereby a free space for the expansion of the coolant is created.
- the elastically deformable portion of the housing returns to its original position during thawing of the coolant due to its elasticity, so that this volume compensation means is available for a further freezing access.
- the elastically deformable portion of the housing is a part of the outer housing part, so that at a bulge of the same expands to the outside and thus within the device no space for the increase in volume of the expands in freezing coolant must be provided.
- the elastically deformable section of the housing is made, for example, from an elastomer, in particular from a silicone mat, or from a rubber (eg NBR, EPDM).
- the drive comprises a motor having a first end with an output shaft and a second end opposite the first end, wherein the volume balance means is disposed in the region of the second end of the engine.
- the coolant channel is often led in multiple turns around the drive and in particular around the engine for a sufficient cooling of the drive.
- the volume compensation means can be provided in a space-saving manner without significantly influencing the structural design of the power tool device.
- volume compensation means are provided for the coolant channel.
- the volume compensation means are arranged, for example, at different areas of the coolant channel.
- the same embodiments of volume balance means are provided on a coolant channel.
- various embodiments of the volume compensation means may be arranged on a coolant channel.
- electric power tool 11 has a housing 12 and arranged in the housing 12 drive 13, which includes a motor 14 and a gear 15.
- the drive shaft 16 for a tool (not shown here) is driven via the gear 15.
- the motor 14 has a first end 18 with an output shaft 17 and a second end 19 opposite the first end 18.
- an electronic control unit 20 for controlling the motor 14 is arranged.
- an inlet opening 27 for supplying the coolant is provided in the power tool 11, which communicates with a coolant channel 26 for discharging the heat generated during operation of the power tool 11 waste heat of the drive 13 in connection.
- the drive shaft 16 for the tool is provided with a bore 23, which is in communication with the coolant channel 26 and forms an outlet opening 28 for discharging the heated coolant.
- the coolant channel 26 extends from the inlet opening 27 on a first side 21 of the motor 14 from the first end 18 to the second end 19, along the second end 19 and on one of the first side 21 opposite side 22 of the motor 14 along the longitudinal extent thereof to the transmission 15 and from there to the outlet opening 28th
- the power tool 11 has an open coolant circuit.
- the supplied coolant is passed to the drive 13 and performs the waste heat generated by this in the operation of the power tool device 11 through the bore 23 in the drive shaft sixteenth the bore to be created with the portable power tool 11 as a rinse water.
- the waste heat generated by the control electronics 20 is dissipated, whereby overheating of the same is prevented.
- the volume compensation means 31 includes a compensation chamber 32, which is sealed in a liquid-tight manner with respect to the coolant channel 26 by means of an elastic membrane 33.
- the elastic membrane 33 is made of a silicone mat. With an increase in the volume of the coolant in the coolant channel 26, the air trapped in the compensation chamber 32 is compressed. When the volume increase of the coolant in the coolant channel 26 decreases, the elastic membrane 33 returns to its original orientation. Further, on the first side 21 of the motor 14, a further volume compensation means 31 is provided.
- the volume compensation means 41 is formed by an elastically deformable insert 42, which is arranged in a receiving space 43 communicating with the coolant channel.
- an elastically deformable insert 42 is for example a block of PUR foam, which is fixed by means of a suitable adhesive to the bottom 44 of the receiving space 43. With an increase in the volume of the coolant in the coolant channel 26, the elastically deformable insert 42 is compressed. If the volume increase of the coolant in the coolant channel 26 decreases again, the elastically deformable insert 42 expands to its original extent.
- the volume compensation means 51 is formed by an elastically deformable section 52 of the housing 12, which forms a wall section of the coolant channel 26.
- the elastically deformable portion 52 of the housing 12 is made of an elastomeric plastic. With an increase in the volume of the coolant in the coolant channel 26, the elastically deformable portion 52 of the housing 12 is dented outwards. If the increase in volume of the coolant in the coolant channel 26 decreases, the elastically deformable portion 52 of the housing 12 returns to its original orientation.
- the volume compensating means 61 comprises a spring-loaded piston 62 which is arranged in a receiving space 63 communicating with the coolant channel.
- the piston 62 is via a coil spring 64 spring loaded.
- a radially disposed on the piston 62 circumferentially disposed seal 65 which bears sealingly against the wall 66 of the receiving space 63, the area under the piston 62 is sealed against penetrating coolant.
- the spring-loaded piston 62 is displaced against the spring force of the coil spring 64 into the receiving space 63. If the increase in volume of the coolant in the coolant channel 26 decreases, the piston 62 returns to its original starting position due to the spring force acting on it.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Portable Power Tools In General (AREA)
Description
Die Erfindung betrifft ein portables Elektrowerkzeuggerät, insbesondere ein portables Diamantkernbohrgerät, der im Oberbegriff des Patentanspruchs 1 genannten Art.The invention relates to a portable power tool, in particular a portable diamond core drilling, referred to in the preamble of claim 1. Art.
Bei portablen Elektrowerkzeuggeräten mit einem in einem Gehäuse angeordneten Antrieb entsteht im Betrieb des Elektrowerkzeuggerätes Wärme, die zum Schutz vor Überhitzung verschiedener Bauteile in dem Elektrowerkzeuggerät aus diesem abgeführt werden muss. Beispielsweise ist ein Lüftermittel, wie ein Ventilator vorgesehen, der über Eintrittsöffnungen im Gehäuse Umgebungsluft ansaugt und die von dem Antrieb erwärmte Luft über Austrittsöffnungen ausbläst. Diese Lüftermittel benötigen Energie, wodurch die Leistung des portablen Elektrowerkzeuggerätes reduziert wird. Zudem ist eine ausreichende Kühlung des Antriebes in einem längeren ununterbrochenen Einsatz des portablen Elektrowerkzeuggerätes nicht immer gewährleistet.In portable power tool devices with a drive arranged in a housing, heat is generated during operation of the power tool, which must be dissipated to protect against overheating of various components in the power tool from this. For example, a fan means, such as a fan is provided which sucks ambient air via inlet openings in the housing and blows out the heated air from the drive via outlet openings. These fan means require power, which reduces the performance of the portable power tool. In addition, a sufficient cooling of the drive in a longer uninterrupted use of the portable power tool is not always guaranteed.
Aus der
Nachteilig an der bekannten Lösung ist, dass bei einer Frostgefahr, z. B. infolge tiefer Temperaturen der Umgebungsluft, das bei einem Arbeitsunterbruch noch im Elektrowerkzeuggerät befindliche Kühlmittel gefrieren kann und deshalb aus dem Elektrowerkzeuggerät entfernt, z. B. evakuiert werden muss. Dies geschieht zum Teil über die Schwerkraft, indem beispielsweise eine Ablassschraube geöffnet wird. Der grösste Teil des noch im Elektrowerkzeuggerät befindlichen Kühlmittels muss jedoch mittels Ausblasen aus dem Elektrowerkzeuggerät entfernt werden.A disadvantage of the known solution is that at a risk of frost, z. B. due to low temperatures of the ambient air, which can still freeze in a power cut located in the power tool coolant and therefore removed from the power tool, z. B. must be evacuated. This happens partly over gravity, for example, by opening a drain plug. However, most of the coolant still in the power tool must be removed by blowing it out of the power tool.
Versäumt der Anwender die Entleerung des Elektrowerkzeuggerätes kann, insbesondere bei Wasser als Kühlmittel, sich Eis im Elektrowerkzeuggerät bilden, was zu einem Volumenanstieg des Kühlmittels führt, so dass hohe Kräfte auf die einzelnen Bauteile und/oder Dichtungen wirken. Dies kann einerseits zu Undichtigkeiten des Eiektrowerkzeuggerätes führen und andererseits die im Elektrowerkzeuggerät angeordneten Bauteile derart deformieren, dass bleibende Risse entstehen. In der Folge würden beispielsweise der Motor und das Getriebe, die zusammen z. B. den Antrieb des Elektrowerkzeuges ausbilden, einer Schädigung durch eintretendes Kühlmittel ausgesetzt.If the user fails to empty the electric power tool, especially in the case of water as a coolant, ice forms in the power tool, which leads to an increase in the volume of the coolant, so that high forces act on the individual components and / or seals. On the one hand, this can lead to leaks in the power tool and, on the other hand, it can deform the components arranged in the power tool in such a way that permanent cracks occur. As a result, for example, the engine and the gearbox, the z. B. form the drive of the power tool, exposed to damage by entering coolant.
Aufgabe der Erfindung ist es, ein portables Elektrowerkzeuggerät zu schaffen, bei dem die schädlichen Auswirkungen eines im Volumen zunehmenden Kühlmittels auf das Elektrowerkzeuggerät verhindert sind.The object of the invention is to provide a portable power tool in which the harmful effects of increasing in volume coolant are prevented on the power tool.
Die Aufgabe ist durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen dargelegt.The object is solved by the features of the independent claim. Advantageous developments are set forth in the subclaims.
Gemäss der Erfindung ist wenigstens ein Volumenausgleichsmittel für den Kühlmittelkanal vorgesehen.According to the invention, at least one volume compensation means is provided for the coolant channel.
Durch das am Kühlmittelkanal vorgesehene Volumenausgleichsmittel lässt sich auch ein sprunghafter Volumenanstieg des Kühlmittels im Kühlmittelkanal, wie er beispielsweise bei gefrierendem Wasser auftritt, ausgeglichen werden. Das mit dem Volumenausgleichsmittel zur Verfügung gestellte Volumen für das sich ausdehnende Kühlmittel ist derart gewählt, dass beim Ausdehnen des Kühlmittels keine hohen Kräfte auf die einzelnen Bauteile und/oder Dichtungen entstehen können. Auch wenn es der Anwender versäumt das Kühlmittel vollständig aus dem Elektrowerkzeuggerät zu entleeren, beispielsweise zu evakuieren, treten keine schädlichen Wirkungen auf das Elektrowerkzeuggerät auf.By means of the volume compensation means provided on the coolant channel, it is also possible to compensate for an abrupt increase in volume of the coolant in the coolant channel, as occurs, for example, in the case of freezing water. The volume made available by the volume compensation means for the expanding coolant is selected such that when the coolant expands no high forces can be produced on the individual components and / or seals. Even if the user fails to completely empty the coolant from the power tool, for example, to evacuate, there are no harmful effects on the power tool.
Die erfindungsgemässe Lösung ist insbesondere bei einem Elektrowerkzeuggerät mit einem offenen Kühlmittelkreislauf vorteilhaft. Aber auch bei einem Elektrowerkzeuggerät mit einem geschlossenen Kühlmittelkreislauf ist die Anordnung eines Volumenausgleichsmittels für den Kühlmittelkanal vorteilhaft, da bei dieser Lösung auf spezielle Kühlmittel oder mit Frostschutz versetzte Kühlmittel, die bis anhin in geschlossenen Kühlmittelkreisläufen Anwendung fanden, verzichtet werden kann. Die speziellen oder mit Frostschutz versetzten Kühlmittel sind teurer als einfache Kühlmittel und teils nicht besonders umweltfreundlich.The inventive solution is particularly advantageous in a power tool with an open coolant circuit. But even with a power tool with a closed coolant circuit, the arrangement of a volume compensation means for the coolant channel is advantageous because in this solution to special coolant or antifreeze offset coolant, which until now in closed coolant circuits application found, can be waived. The special or anti-freeze coolants are more expensive than simple coolants and some are not particularly environmentally friendly.
Vorzugsweise beinhaltet das Volumenausgleichsmittel einen Ausgleichsraum, der mittels einer elastischen Membrane flüssigkeitsdicht gegenüber dem Kühlmittelkanal abgedichtet ist. Das Kühlmittel kann sich beim Gefrieren ausdehnen, wobei die im Ausgleichsraum eingeschlossene Luft komprimiert wird. Die elastische Membrane dehnt sich beim Tauen des Kühlmittels durch deren Elastizität wieder aus, so dass dieses Volumenausgleichsmittel für einen weiteren Gefrierzugang zur Verfügung steht. Die elastische Membrane ist beispielsweise aus einem Elastomer, insb. aus einer Silikonmatte, oder aus einem Gummi (z. B. NBR, EPDM) gefertigt.The volume compensation means preferably includes a compensation chamber, which is sealed in a liquid-tight manner with respect to the coolant channel by means of an elastic membrane. The refrigerant may expand upon freezing, compressing the trapped air in the expansion space. The elastic membrane expands during thawing of the coolant by their elasticity again, so that this volume compensation means is available for a further freezing access. The elastic membrane is made, for example, from an elastomer, in particular from a silicone mat, or from a rubber (eg NBR, EPDM).
In einer Variante der Erfindung ist das elastische Volumenausgleichsmittel von einem elastisch deformierbaren Einlegeteil gebildet, das in einem mit dem Kühlmittelkanal in Verbindung stehenden Aufnahmeraum angeordnet ist. Auch bei dieser Lösung kann sich das Kühlmittel beim Gefrieren ausdehnen, wobei das elastisch deformierbare Einlegeteil komprimiert wird. Das elastische Einlegeteil dehnt sich beim Tauen des Kühlmittels durch dessen Elastizität wieder auf die vor der Komprimierung vorhandene Ausdehnung aus, so dass dieses Volumenausgleichsmittel für einen weiteren Gefrierzugang zur Verfügung steht. Der Aufnahmeraum für das elastisch deformierbare Einlegeteil ist vorteilhaft als Vertiefung an einem den Kühlmittelkanal ausbildenden Wandabschnitt ausgeformt. Das elastisch deformierbare Einlegeteil ist beispielsweise am Boden des Aufnahmeraums mittels eines Klebers zur Sicherung desselben festgelegt. Das elastisch deformierbare Einlegeteil ist beispielsweise aus einem geschlossenzelligen Schaumstoff, vorzugsweise aus einem PUR-Schaum gefertigt.In a variant of the invention, the elastic volume compensation means is formed by an elastically deformable insert, which is arranged in a receiving space communicating with the coolant channel. Also in this solution, the refrigerant can expand during freezing, wherein the elastically deformable insert is compressed. The elastic insert expands during the thawing of the coolant by its elasticity back to the existing before compression expansion, so that this volume compensation means is available for a further freezing access. The receiving space for the elastically deformable insert is advantageously formed as a depression on a wall forming the coolant channel wall portion. The elastically deformable insert part is fixed to the bottom of the receiving space by means of an adhesive for securing the same, for example. The elastically deformable insert is made, for example, from a closed-cell foam, preferably from a PUR foam.
In einer weiteren Variante der Erfindung beinhaltet das Volumenausgleichsmittel einen federbelasteten Kolben, der in einem mit dem Kühlmittelkanal in Verbindung stehenden Aufnahmeraum angeordnet ist. Bei einer Volumenvergrösserung des Kühlmittels wird der Kolben gegen eine Federkraft, beispielsweise einer Schraubenfeder, in den Aufnahmeraum gedrückt, wodurch ein Freiraum für die Ausdehnung des Kühlmittels geschaffen wird. Taut das Kühlmittel wieder auf, wird der Kolben mittels der wirkenden Federkraft wieder in seine Ausgangsstellung gebracht, so dass dieses Volumenausgleichsmittel für einen weiteren Gefrierzugang zur Verfügung steht. Der Kolben weist vorteilhafterweise eine radial um diesen angeordnete Dichtung, beispielsweise aus einem gegenüber dem Kühlmittel widerstandsfähigen Gummi auf, die dichtend mit der Wandung des Aufnahmeraums in Anlage steht und ein Eindringen des Kühlmittels in den Aufnahmeraum hinter den Kolben verhindert. Des Weiteren ist vorteilhafterweise ein Anschlag für den Kolben vorgesehen, der dessen Verfahrweg aus dem Aufnahmeraum heraus begrenzt. Der Aufnahmeraum für den federbelasteten Kolben ist vorteilhaft als Vertiefung an einem den Kühlmittelkanal ausbildenden Wandabschnitt ausgeformt.In a further variant of the invention, the volume compensation means includes a spring-loaded piston which is arranged in a receiving space communicating with the coolant channel. With an increase in the volume of the coolant, the piston is pressed against a spring force, for example a helical spring, into the receiving space, whereby a free space for the expansion of the coolant is created. When the coolant is thawed again, the piston is brought back into its starting position by means of the acting spring force, so that this volume compensation means is available for a further freezing access. The piston advantageously has a radially arranged around this seal, for example, a relative to the coolant resistant rubber sealingly with the wall of the receiving space in Plant stands and prevents penetration of the coolant into the receiving space behind the piston. Furthermore, a stop for the piston is advantageously provided which limits its travel from the receiving space out. The receiving space for the spring-loaded piston is advantageously formed as a depression on a wall forming the coolant channel wall portion.
In einer weiteren Variante der Erfindung ist das Volumenausgleichsmittel von einem elastisch deformierbaren Abschnitt des Gehäuses gebildet, der einen Wandabschnitt des Kühlmittelkanals bildet. Bei einer Volumenvergrösserung des Kühlmittels wird der elastisch deformierbare Abschnitt des Gehäuses ausgebeult, wodurch ein Freiraum für die Ausdehnung des Kühlmittels geschaffen wird. Der elastisch deformierbare Abschnitt des Gehäuses kehrt beim Tauen des Kühlmittels durch dessen Elastizität wieder in seine Ausgangsstellung zurück, so dass dieses Volumenausgleichsmittel für einen weiteren Gefrierzugang zur Verfügung steht. Vorteilhafterweise ist der elastisch deformierbare Abschnitt des Gehäuses ein Teil des aussenliegenden Gehäuseteils, so dass bei einer Ausbeulung desselben dieser sich nach aussen ausdehnt und somit innerhalb des Gerätes kein Raum für die Volumenvergrösserung des sich bei Frost ausdehnenden Kühlmittels zur Verfügung gestellt werden muss. Der elastisch deformierbare Abschnitt des Gehäuses ist beispielsweise aus einem Elastomer, insbesondere aus einer Silikonmatte, oder aus einem Gummi (z. B. NBR, EPDM) gefertigt.In a further variant of the invention, the volume compensation means is formed by an elastically deformable portion of the housing, which forms a wall portion of the coolant channel. With an increase in the volume of the coolant, the elastically deformable portion of the housing is bulged, whereby a free space for the expansion of the coolant is created. The elastically deformable portion of the housing returns to its original position during thawing of the coolant due to its elasticity, so that this volume compensation means is available for a further freezing access. Advantageously, the elastically deformable portion of the housing is a part of the outer housing part, so that at a bulge of the same expands to the outside and thus within the device no space for the increase in volume of the expands in freezing coolant must be provided. The elastically deformable section of the housing is made, for example, from an elastomer, in particular from a silicone mat, or from a rubber (eg NBR, EPDM).
Vorzugsweise umfasst der Antrieb einen Motor, der ein erstes Ende mit einer Abtriebswelle und ein dem ersten Ende gegenüberliegendes zweites Ende aufweist, wobei das Volumenausgleichsmittel im Bereich des zweiten Endes des Motors angeordnet ist. Der Kühlmittelkanal wird für eine ausreichende Kühlung des Antriebs oftmals in mehreren Windungen um den Antrieb und insbesondere um den Motor herum geführt. In dem Bereich des zweiten Endes des Motors kann ohne eine wesentliche Beeinflussung der baulichen Ausgestaltung des Elektrowerkzeuggerätes das Volumenausgleichsmittel platzsparend vorgesehen werden.Preferably, the drive comprises a motor having a first end with an output shaft and a second end opposite the first end, wherein the volume balance means is disposed in the region of the second end of the engine. The coolant channel is often led in multiple turns around the drive and in particular around the engine for a sufficient cooling of the drive. In the region of the second end of the motor, the volume compensation means can be provided in a space-saving manner without significantly influencing the structural design of the power tool device.
Bevorzugt sind mehrere Volumenausgleichsmittel für den Kühlmittelkanal vorgesehen. Die Volumenausgleichsmittel sind beispielsweise an verschiedenen Bereichen des Kühlmittelkanals angeordnet. Beispielsweise werden die gleichen Ausgestaltungen von Volumenausgleichsmittel an einem Kühlmittelkanal vorgesehen. Alternativ können auch verschiedene Ausgestaltungen des Volumenausgleichsmittels an einem Kühlmittelkanal angeordnet sein.Preferably, a plurality of volume compensation means are provided for the coolant channel. The volume compensation means are arranged, for example, at different areas of the coolant channel. For example, the same embodiments of volume balance means are provided on a coolant channel. Alternatively, various embodiments of the volume compensation means may be arranged on a coolant channel.
Die Erfindung wird nachstehend anhand mehrerer Ausführungsbeispiele näher erläutert. Es zeigen:
- Fig. 1
- Ein wassergekühltes Diamantbohrgerät in einer Seitenansicht;
- Fig. 2
- einen Schnitt entlang der Linie II-II in
Fig. 1 mit einem ersten Ausführungsbeispiel der Erfindung; - Fig. 3
- einen Schnitt gem.
Fig. 2 mit einem zweiten Ausführungsbeispiel der Erfindung; - Fig. 4
- einen Schnitt gem.
Fig. 2 mit einem dritten Ausführungsbeispiel der Erfindung; und - Fig. 5
- einen schematischen Schnitt durch ein viertes Ausführungsbeispiel der Erfindung.
- Fig. 1
- A water-cooled diamond drill in a side view;
- Fig. 2
- a section along the line II-II in
Fig. 1 with a first embodiment of the invention; - Fig. 3
- a cut acc.
Fig. 2 with a second embodiment of the invention; - Fig. 4
- a cut acc.
Fig. 2 with a third embodiment of the invention; and - Fig. 5
- a schematic section through a fourth embodiment of the invention.
Grundsätzlich sind in den Figuren gleiche Teile mit den gleichen Bezugszeichen versehen.Basically, the same parts are provided with the same reference numerals in the figures.
Das in
An dem Gehäuse 12 ist eine Eintrittsöffnung 27 zur Zuführung des Kühlmittels in das Elektrowerkzeuggerät 11 vorgesehen, die mit einem Kühlmittelkanal 26 zum Abführen der im Betrieb des Elektrowerkzeuggerätes 11 erzeugten Abwärme des Antriebs 13 in Verbindung steht. Die Antriebswelle 16 für das Werkzeug ist mit einer Bohrung 23 versehen, welche mit dem Kühlmittelkanal 26 in Verbindung steht und eine Austrittsöffnung 28 zur Abführung des erwärmten Kühlmittels ausbildet. Der Kühlmittelkanal 26 erstreckt sich von der Eintrittsöffnung 27 aus auf einer ersten Seite 21 des Motors 14 von dessen ersten Ende 18 zu dessen zweiten Ende 19, entlang des zweiten Endes 19 und auf eine der ersten Seite 21 gegenüberliegende Seite 22 des Motors 14 entlang dessen Längserstreckung bis zum Getriebe 15 und von dort bis zur Austrittsöffnung 28.On the
Das Elektrowerkzeuggerät 11 weist einen offenen Kühlmittelkreislauf auf. Das zugeführte Kühlmittel wird um den Antrieb 13 geleitet und führt die von diesem im Betrieb des Elektrowerkzeuggerätes 11 erzeugte Abwärme durch die Bohrung 23 in der Antriebswelle 16 der mit dem portablen Elektrowerkzeuggerät 11 zu erstellenden Bohrung als Spülwasser zu. Gleichzeitig mit der Kühlung des Antriebs 13 wird die von der Steuerelektronik 20 erzeugte Abwärme abgeführt, womit eine Überhitzung derselben verhindert wird.The
Im Bereich des zweiten Endes 19 des Motors 14 ist ein Volumenausgleichsmittel 31 für den Kühlmittelkanal 26 vorgesehen, das in der
Bei der in
Bei der in
Bei der in
Claims (7)
- Portable electric tool, having a housing (12) and a drive (13) arranged in the housing (12), and having a coolant channel (26) for a coolant for cooling the drive (13), characterised by at least one volume compensating means (31; 41; 51; 61) for the coolant channel (26).
- Portable electric tool according to claim 1, characterised in that the volume compensating means (31) includes a compensating chamber (32) which is sealed off by a resilient membrane (33) so as to be fluid tight with respect to the coolant channel (26).
- Portable electric tool according to claim 1, characterised in that the resilient volume compensating means (41) is formed by a resiliently deformable insert (42) which is arranged in a receiving chamber (43) that is in communication with the coolant channel (26).
- Portable electric tool according to claim 1, characterised in that the volume compensating means (61) includes a spring loaded piston (62) which is arranged in a receiving chamber (63) that is in communication with the coolant channel (26).
- Portable electric tool according to claim 1, characterised in that the volume compensating means (51) is formed by a resiliently deformable section (52) of the housing (12) that forms a wall section of the coolant channel (26).
- Portable electric tool according to one of claims 1 to 5, characterised in that the drive (13) comprises a motor (14) with a first end (18) that has a drive shaft (17) and a second end (19) disposed opposite the first end (18), the volume compensating means (31; 41; 51; 61) being arranged in the region of the second end (19) of the motor (14).
- Portable electric tool according to one of claims 1 to 6, characterised in that a plurality of volume compensating means (31) are provided for the coolant channel (26).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510000196 DE102005000196A1 (en) | 2005-12-21 | 2005-12-21 | Portable power tool |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1800806A1 EP1800806A1 (en) | 2007-06-27 |
EP1800806B1 true EP1800806B1 (en) | 2008-07-16 |
Family
ID=37719308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060125302 Not-in-force EP1800806B1 (en) | 2005-12-21 | 2006-12-04 | Portable electric tool |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1800806B1 (en) |
DE (2) | DE102005000196A1 (en) |
ES (1) | ES2308678T3 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN206869819U (en) * | 2016-06-01 | 2018-01-12 | 南京德朔实业有限公司 | Power tool |
EP3578314A1 (en) * | 2018-06-06 | 2019-12-11 | HILTI Aktiengesellschaft | Setting device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB883684A (en) * | 1958-08-29 | 1961-12-06 | Siemens Schuckert Great Britia | Improvements in or relating to portable electric tools |
US3294182A (en) * | 1964-09-23 | 1966-12-27 | Black & Decker Mfg Co | Power tools |
DE19846712A1 (en) * | 1998-10-09 | 2000-04-13 | Hilti Ag | Device for processing a hard surface |
DE10037418A1 (en) * | 2000-07-19 | 2002-02-07 | Hilti Ag | Electric hand tool device with electro-pneumatic hammer mechanism |
-
2005
- 2005-12-21 DE DE200510000196 patent/DE102005000196A1/en not_active Withdrawn
-
2006
- 2006-12-04 ES ES06125302T patent/ES2308678T3/en active Active
- 2006-12-04 DE DE200650001120 patent/DE502006001120D1/en active Active
- 2006-12-04 EP EP20060125302 patent/EP1800806B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
DE102005000196A1 (en) | 2007-06-28 |
ES2308678T3 (en) | 2008-12-01 |
DE502006001120D1 (en) | 2008-08-28 |
EP1800806A1 (en) | 2007-06-27 |
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