EP2268457B1 - Connecting device/housing combination for a machine tool, in particular for a handheld machine tool - Google Patents

Connecting device/housing combination for a machine tool, in particular for a handheld machine tool Download PDF

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Publication number
EP2268457B1
EP2268457B1 EP09732883.5A EP09732883A EP2268457B1 EP 2268457 B1 EP2268457 B1 EP 2268457B1 EP 09732883 A EP09732883 A EP 09732883A EP 2268457 B1 EP2268457 B1 EP 2268457B1
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EP
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Prior art keywords
housing
connecting device
combination according
parts
housing combination
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EP09732883.5A
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German (de)
French (fr)
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EP2268457A1 (en
Inventor
Marcus Schuller
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the invention relates to a connecting device-housing combination for a machine tool, in particular for a hand tool, with a housing comprising at least two separate housing parts, wherein the separate housing parts are to be connected via a connecting device.
  • Electromotive powered hand tools such. Angle grinders have as drive an electric motor, which is arranged in a motor housing of the power tool, to which a handle housing is connected, consisting of two handle half shells.
  • the connection between the handle housing and the motor housing via a connecting device which may optionally include a pivot bearing for ergonomic reasons, which allows a Verfretekeit between the handle housing and the motor housing. It must be ensured that the functionality is not impaired even during prolonged operation despite a considerable load with abrasive dirt particles, which can settle in the area of the pivot bearing between the handle and motor housing.
  • a hand tool machine with a motor housing with which a handle housing is rotatably connected.
  • the rotatability of the handle housing relative to the motor housing is accomplished by means of a rotary bearing, which has a spherical section on the motor housing and a concave portion on the handle housing includes.
  • the concave portion has radially inwardly facing ribs which abut against the spherical portion 123. Between adjacent ribs extends an annular space in which a radial extension latchingly protrudes, which is formed integrally with the spherical portion. From the annulus no dirt particles can be derived.
  • the invention is based on the object, a connecting device-housing combination for a machine tool, in particular for a hand tool, with simple constructive measures in such a way that between different housing parts over a long period of operation functional Verfitschkeit is given.
  • the connecting device-housing combination according to the invention can be used in a machine tool, which is preferably a hand-held power tool such as e.g. an angle grinder acts.
  • the housing is at least two parts, wherein the two housing parts are preferably a handle housing on which the machine tool is held by the operator, and a motor housing for receiving a drive motor.
  • the connecting device between the two housing parts comprises a rotary bearing, so that the two housing parts can be rotated relative to each other about the axis of rotation of the bearing. Furthermore, it is provided that in at least one housing part leading to the rotary bearing discharge channel is introduced for dirt particles.
  • the discharge channel is preferably guided up to the contact region between the two bearing parts which can be rotated relative to one another. Due to the relative rotation during operation of the machine tool, the dirt particles reach the region of the discharge channel and can be removed therefrom. As a result, a self-cleaning effect is realized for which no active measures are required, but only by the Relative movement between the housing parts and associated with it via the relative movement between the bearing parts works.
  • the discharge channel preferably runs in the radial direction, but at least with a component in the radial direction, that is possibly at an angle to the radial direction, in order to discharge the dirt particles in this direction from the area of the rotation bearing.
  • the discharge channel is expediently guided inwards into the interior of the housing, in principle also a connection to the outside via the discharge channel being considered, so that the dirt particles are led out through the discharge channel and released into the environment.
  • the discharge channel leads inwards, then it is expedient to ensure that the dirt particles are continued inside to prevent them from depositing inside the housing.
  • the discharge channel is led to a flow channel through the housing, which leads a cooling air flow for cooling the motor and other components of the machine tool through the housing.
  • the discharge channel discharges into this flow channel for the cooling air
  • the dirt particles which are discharged via the discharge channel from the rotary bearing, are guided into the cooling air flow and led out of this via a housing outlet opening out of the housing. It proves to be advantageous that the cooling air flow exerts a suction effect on the discharge channel, so that the dirt particles, which are located in the discharge channel, are transported by the suction in the cooling air flow.
  • the discharge channel has two radially extending in the opposite direction portions, of which a first Section inward into the housing interior and the second section is guided to the outside.
  • the two sections of the discharge channel are expediently assigned to the respective, relatively rotatable bearing parts, so that part of the dirt particles are guided radially outwards directly into the environment and a part of the dirt particles is led away radially inwardly from the rotary bearing.
  • the inwardly and outwardly guided portions of the discharge channel are not coaxial with each other, but offset from each other, so that there are in fact different discharge channels.
  • a plurality of drainage channels is arranged, which expediently all extend inwards, wherein, where appropriate, there is also the possibility that the drainage channels all extend to the outside or part of the discharge channels inside and part outside.
  • the discharge channels can be distributed uniformly over the circumference, or, according to a preferred embodiment, non-uniformly, whereby constructive circumstances can be taken into account.
  • the discharge channel is located on the front side of a housing part and is open towards the free end, said free end is closed in the assembled state of the second housing part, whereby a clear discharge direction of the dirt particles is defined via the discharge channel.
  • the discharge channel is formed as a recess which is introduced into the end face of a housing part and extends radially between the contact surface of the rotary bearing part, this housing part and the housing interior.
  • the rotary bearing is designed for example as a latching projection on each housing part, wherein the latching projections are to bring to the housing parts in a latching position, such that in the axial direction of the housing parts or the rotary bearing an effective positive engagement is given, but at the same time a Relativverformat Wegkeit about the longitudinal or ., Rotation axis of the rotary bearing is realized.
  • the discharge channel extends in the radial direction to the contact surface between the latching projections on the housing parts to be joined together, wherein in the axial direction of the discharge channel preferably only has an extension corresponding to the axial length of a latching projection, even if two or more latching projections are arranged axially one behind the other.
  • hand tool 1 which is for example an angle grinder, has a multi-part housing 2, of which a motor housing 3 and a two-part handle housing 4 with the two handle half shells 4a and 4b are shown.
  • motor housing 3 In the motor housing 3, an electric drive motor 5 is received, which drives a rotatably mounted tool shaft 7 via a symbolically drawn drive connection 6, to which a tool 8 is fastened.
  • the motor housing 3 and the handle housing 4 are connected to each other via a connecting device 9.
  • the connecting device 9 comprises, as Fig. 2 can be seen, latching or connecting parts 10 and 11 on one of the housing parts, which engage in associated, correspondingly formed latching or connecting parts 12 and 13 latching.
  • the locking or connecting parts 10, 11, 12, 13 are tooth-like with radial projections and recesses formed with tooth tips and an intermediate tooth base and extending in the circumferential direction.
  • the latching or connecting parts 10, 11 on the housing part 4 and the corresponding latching or connecting recesses 12, 13 are arranged axially one behind the other on the housing part 3, wherein the tooth-like Projections and the corresponding recesses transverse to Connecting or loosening direction 14 and thus extend in the radial direction.
  • a plurality of discharge channels 15 are introduced, which are open to the front side and in the axial direction, ie in connection or release direction 14, to the front side immediately adjacent, sawtooth-like and circumferential tooth base between the parallel connecting parts 12 and 13 extend.
  • the discharge channels 15, which are formed as recesses in the motor housing 3 communicate with the connecting device 9 between the housing parts 3 and 4.
  • the connecting device 9 Due to the rotational symmetry of the connecting projections 10, 11 and the associated connecting recesses 12 and 13, the connecting device 9 also allows rotation about the axis which is parallel to the connection or release direction 14; The connecting device 9 thus represents at the same time a rotary bearing, which creates a relative rotational possibility between the housing parts 3 and 4 to be connected.
  • the connecting projections 10, 11 and the connecting recesses 12 and 13 move relative to each other in the circumferential direction with the effect that dirt particles which have settled in the region of the contact surface between the connecting projections and the connecting recesses are transported in the direction of the discharge channels 15 and derived therefrom from the connecting device or the rotary bearing.
  • a self-cleaning effect in the connecting device or the rotary bearing 9 is realized.
  • a lip or other protrusion can be arranged on a tooth projection or in the region of a tooth base, which transports the settled dirt particles in the direction of the discharge channel.
  • Fig. 3 can be seen extending the recesses formed as recesses channels 15 at least substantially in the radial direction, both radially outward to the outside of the tooth-shaped connecting elements on the housing part 3 and radially inwardly to the housing interior.
  • Dirt particles which deposit in the region of the contact surfaces between the intermeshing, tooth-shaped connecting elements between the housing parts 3 and 4
  • the discharge channels 15 suitably communicate with a flow channel, which is formed in the housing and extends in the axial direction and flows in the cooling air for cooling the motor.
  • the dirt particles guided inwards via the discharge channels 15 are detected by the cooling air flow and are discharged to the outside with the latter via outflow openings in the housing.
  • the discharge channel 15 extends in the axial direction as far as the tooth root between adjacent, radially protruding connecting projections.
  • the discharge channel 15 extends in the axial direction only to the first tooth base, but not up to the second tooth base, which lies at a greater axial distance from the free end face. Nevertheless, it may be expedient to make the axial extent of the discharge channel so great that the second tooth base or further following tooth roots are also achieved.
  • Fig. 5 is a detail of the handle housing 4 shown in the region of the connecting device, which at the same time the Rotary bearing forms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Motor Or Generator Frames (AREA)

Description

Die Erfindung bezieht sich auf eine Verbindungseinrichtung-Gehäuse-Kombination für eine Werkzeugmaschine, insbesondere für eine Handwerkzeugmaschine, mit einem mindestens zwei separate Gehäuseteile umfassenden Gehäuse, wobei die separaten Gehäuseteile über eine Verbindungseinrichtung zu verbinden sind.The invention relates to a connecting device-housing combination for a machine tool, in particular for a hand tool, with a housing comprising at least two separate housing parts, wherein the separate housing parts are to be connected via a connecting device.

Stand der TechnikState of the art

Elektromotorisch betriebene Handwerkzeugmaschinen wie z.B. Winkelschleifer besitzen als Antrieb einen Elektromotor, der in einem Motorgehäuse der Handwerkzeugmaschine angeordnet ist, mit dem ein Handgriffgehäuse verbunden ist, bestehend aus zwei Griffhalbschalen. Die Verbindung zwischen dem Handgriffgehäuse und dem Motorgehäuse erfolgt über eine Verbindungseinrichtung, die ggf. aus ergonomischen Gründen ein Drehlager umfassen kann, welches eine Verdrehmöglichkeit zwischen dem Handgriffgehäuse und dem Motorgehäuse erlaubt. Hierbei ist darauf zu achten, dass auch bei einem längeren Betrieb die Funktionalität trotz einer erheblichen Belastung mit abrasiven Schmutzpartikel nicht beeinträchtigt wird, die sich auch im Bereich des Drehlagers zwischen Griff- und Motorgehäuse absetzen können.Electromotive powered hand tools such. Angle grinders have as drive an electric motor, which is arranged in a motor housing of the power tool, to which a handle housing is connected, consisting of two handle half shells. The connection between the handle housing and the motor housing via a connecting device, which may optionally include a pivot bearing for ergonomic reasons, which allows a Verdrehmöglichkeit between the handle housing and the motor housing. It must be ensured that the functionality is not impaired even during prolonged operation despite a considerable load with abrasive dirt particles, which can settle in the area of the pivot bearing between the handle and motor housing.

Aus der EP 1 714 738 A2 ist eine Handwerkzeugmaschine mit einem Motorgehäuse bekannt, mit dem ein Griffgehäuse drehbar verbunden ist. Die Drehbarkeit des Griffgehäuses gegenüber dem Motorgehäuse wird mithilfe eines Rotationslagers bewerkstelligt, das einen sphärischen Abschnitt am Motorgehäuse und einen konkaven Abschnitt am Griffgehäuse umfasst. Der konkave Abschnitt weist radial nach innen weisende Rippen auf, die an dem sphärischen Abschnitt 123 anliegen. Zwischen benachbarten Rippen erstreckt sich ein Ringraum, in den ein radialer Fortsatz verrastend einragt, welcher einteilig mit dem sphärischen Abschnitt ausgebildet ist. Aus dem Ringraum können keine Schmutzpartikel abgeleitet werden.From the EP 1 714 738 A2 a hand tool machine with a motor housing is known, with which a handle housing is rotatably connected. The rotatability of the handle housing relative to the motor housing is accomplished by means of a rotary bearing, which has a spherical section on the motor housing and a concave portion on the handle housing includes. The concave portion has radially inwardly facing ribs which abut against the spherical portion 123. Between adjacent ribs extends an annular space in which a radial extension latchingly protrudes, which is formed integrally with the spherical portion. From the annulus no dirt particles can be derived.

Aus der US 2004/0148789 A1 ist es bekannt, die Relativdrehlage zwischen zwei Gehäuseteilen verstellen zu können. An der Stirnseite eines Gehäuseteiles befindet sich eine umlaufende, ringförmige Nut, die im montierten Zustand von einem Ring mit einem radial nach innen weisenden Vorsprung übergriffen wird, wobei der Ring an der Stirnseite eines weiteren Gehäuseteils angeordnet ist. In die Nut sind Ausnehmungen eingebracht, die sich in Radialrichtung erstrecken, jedoch nicht bis zum radial innen liegenden Gehäuseinnenraum. Die Ausnehmungen dienen zur Aufnahme eines Klemmteils.From the US 2004/0148789 A1 It is known to be able to adjust the relative rotational position between two housing parts. On the front side of a housing part is a circumferential, annular groove which is overlapped in the mounted state by a ring with a radially inwardly facing projection, wherein the ring is arranged on the end face of a further housing part. In the groove recesses are introduced, which extend in the radial direction, but not to the radially inner interior of the housing. The recesses serve to receive a clamping part.

Offenbarung der ErfindungDisclosure of the invention

Der Erfindung liegt die Aufgabe zu Grunde, eine Verbindungseinrichtung-Gehäuse-Kombination für eine Werkzeugmaschine, insbesondere für eine Handwerkzeugmaschine, mit einfachen konstruktiven Maßnahmen so auszubilden, dass zwischen verschiedenen Gehäuseteilen eine über einen langen Betriebszeitraum funktionstüchtige Verdrehmöglichkeit gegeben ist.The invention is based on the object, a connecting device-housing combination for a machine tool, in particular for a hand tool, with simple constructive measures in such a way that between different housing parts over a long period of operation functional Verdrehmöglichkeit is given.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruches 1 gelöst. Die Unteransprüche geben zweckmäßige Weiterbindungen an.This object is achieved with the features of claim 1. The dependent claims indicate expedient further connections.

Die erfindungsgemäße Verbindungseinrichtung-Gehäuse-Kombination kann in einer Werkzeugmaschine eingesetzt werden, bei der es sich bevorzugt um eine Handwerkzeugmaschine wie z.B. einen Winkelschleifer handelt. Das Gehäuse ist mindestens zweigeteilt, wobei die beiden Gehäuseteile vorzugsweise ein Griffgehäuse, an dem die Werkzeugmaschine von der Bedienperson gehalten wird, und ein Motorgehäuse zur Aufnahme eines Antriebsmotors sind. Die Verbindungseinrichtung zwischen den beiden Gehäuseteilen umfasst ein Rotationslager, so dass die beiden Gehäuseteile relativ zueinander um die Drehachse des Lagers verdreht werden können. Des Weiteren ist vorgesehen, dass in mindestens ein Gehäuseteil ein zum Rotationslager führender Ableitungskanal für Schmutzpartikel eingebracht ist.The connecting device-housing combination according to the invention can be used in a machine tool, which is preferably a hand-held power tool such as e.g. an angle grinder acts. The housing is at least two parts, wherein the two housing parts are preferably a handle housing on which the machine tool is held by the operator, and a motor housing for receiving a drive motor. The connecting device between the two housing parts comprises a rotary bearing, so that the two housing parts can be rotated relative to each other about the axis of rotation of the bearing. Furthermore, it is provided that in at least one housing part leading to the rotary bearing discharge channel is introduced for dirt particles.

Über den Ableitungskanal, der zum Rotationslager geführt ist, werden Schmutzpartikel abgeleitet, die sich im Bereich des Rotationslagers abgesetzt haben. Dies betrifft insbesondere die Schmutzpartikel, die sich in der Kontaktfläche zwischen den relativ zueinander verdrehbaren Lagerteilen des Rotationslagers abgesetzt haben und somit die Rotation unmittelbar beeinträchtigen; der Ableitungskanal ist dementsprechend vorzugsweise bis zu dem Kontaktbereich zwischen den beiden relativ zueinander verdrehbaren Lagerteilen geführt. Durch die Relativverdrehung im Betrieb der Werkzeugmaschine gelangen die Schmutzpartikel in den Bereich des Ableitungskanals und können über diesen abgeführt werden. Dadurch wird ein Selbstreinigungseffekt realisiert, für den keine aktiven Maßnahmen erforderlich sind, sondern der allein durch die Relativbewegung zwischen den Gehäuseteilen und damit verbunden über die Relativbewegung zwischen den Lagerteilen funktioniert. Diese Relativbewegung genügt, um abgesetzte Schmutzpartikel zwischen den Lagerteilen in Umfangsrichtung bis zu dem Ableitungskanal zu transportieren und anschließend aus dem Bereich der Kontaktflächen zwischen den Lagerteilen wegzuführen. Durch den Selbstreinigungseffekt bleibt die Funktionalität der Verbindungseinrichtung, insbesondere die Verdrehmöglichkeit über einen langen Betriebszeitraum gewährleistet.About the discharge channel, which is led to the rotation bearing, dirt particles are derived, which have settled in the area of the rotation bearing. This concerns in particular the dirt particles that have settled in the contact surface between the rotatable bearing parts of the rotary bearing relative to each other and thus directly affect the rotation; Accordingly, the discharge channel is preferably guided up to the contact region between the two bearing parts which can be rotated relative to one another. Due to the relative rotation during operation of the machine tool, the dirt particles reach the region of the discharge channel and can be removed therefrom. As a result, a self-cleaning effect is realized for which no active measures are required, but only by the Relative movement between the housing parts and associated with it via the relative movement between the bearing parts works. This relative movement is sufficient to transport sedimented dirt particles between the bearing parts in the circumferential direction up to the discharge channel and then lead away from the area of the contact surfaces between the bearing parts. Due to the self-cleaning effect, the functionality of the connecting device, in particular the possibility of twisting over a long period of operation, is ensured.

Der Ableitungskanal verläuft vorzugsweise in Radialrichtung, zumindest jedoch mit einer Komponente in Radialrichtung, also ggf. mit einem Winkel zur Radialrichtung, um die Schmutzpartikel in dieser Richtung aus dem Bereich des Rotationslagers abzuleiten. Der Ableitungskanal ist zweckmäßigerweise nach innen in das Gehäuseinnere geführt, wobei grundsätzlich auch eine Verbindung nach außen über den Ableitungskanal in Betracht kommt, so dass die Schmutzpartikel über den Ableitungskanal nach außen geführt und in die Umgebung entlassen werden. Führt der Ableitungskanal dagegen nach innen, so ist es zweckmäßig, dafür zu sorgen, dass im Inneren die Schmutzpartikel weitergeführt werden, um eine Ablagerung im Gehäuseinneren zu verhindern. Vorzugsweise ist der Ableitungskanal bis zu einem Strömungskanal durch das Gehäuse geführt, der einen Kühlluftstrom zur Kühlung des Motors und sonstiger Bauteile der Werkzeugmaschine durch das Gehäuse führt. Mündet der Ableitungskanal in diesen Strömungskanal für die Kühlluft, so werden die Schmutzpartikel, welche über den Ableitungskanal vom Rotationslager abgeleitet werden, in den Kühlluftstrom geführt und von diesem über eine Gehäuseaustrittsöffnung aus dem Gehäuse herausgeführt. Hierbei erweist es sich als vorteilhaft, dass der Kühlluftstrom eine Sogwirkung auf den Ableitungskanal ausübt, so dass die Schmutzpartikel, welche sich im Ableitungskanal befinden, durch den Sog in den Kühlluftstrom befördert werden.The discharge channel preferably runs in the radial direction, but at least with a component in the radial direction, that is possibly at an angle to the radial direction, in order to discharge the dirt particles in this direction from the area of the rotation bearing. The discharge channel is expediently guided inwards into the interior of the housing, in principle also a connection to the outside via the discharge channel being considered, so that the dirt particles are led out through the discharge channel and released into the environment. In contrast, if the discharge channel leads inwards, then it is expedient to ensure that the dirt particles are continued inside to prevent them from depositing inside the housing. Preferably, the discharge channel is led to a flow channel through the housing, which leads a cooling air flow for cooling the motor and other components of the machine tool through the housing. If the discharge channel discharges into this flow channel for the cooling air, the dirt particles, which are discharged via the discharge channel from the rotary bearing, are guided into the cooling air flow and led out of this via a housing outlet opening out of the housing. It proves to be advantageous that the cooling air flow exerts a suction effect on the discharge channel, so that the dirt particles, which are located in the discharge channel, are transported by the suction in the cooling air flow.

Gegebenenfalls weist der Ableitungskanal zwei radial sich in Gegenrichtung erstreckende Abschnitte auf, von denen ein erster Abschnitt nach innen in das Gehäuseinnere und der zweite Abschnitt nach außen geführt ist. Die beiden Abschnitte des Ableitungskanals sind in diesem Fall zweckmäßigerweise den jeweiligen, relativ zueinander verdrehbaren Lagerteilen zugeordnet, so dass ein Teil der Schmutzpartikel radial nach außen direkt in die Umgebung geführt und ein Teil der Schmutzpartikel radial nach innen vom Rotationslager weggeführt wird. Es ist auch möglich, dass die nach innen und nach außen geführten Abschnitte des Ableitungskanals nicht koaxial zueinander liegen, sondern versetzt zueinander, so dass es sich faktisch um verschiedene Ableitungskanäle handelt.Optionally, the discharge channel has two radially extending in the opposite direction portions, of which a first Section inward into the housing interior and the second section is guided to the outside. In this case, the two sections of the discharge channel are expediently assigned to the respective, relatively rotatable bearing parts, so that part of the dirt particles are guided radially outwards directly into the environment and a part of the dirt particles is led away radially inwardly from the rotary bearing. It is also possible that the inwardly and outwardly guided portions of the discharge channel are not coaxial with each other, but offset from each other, so that there are in fact different discharge channels.

Gemäß einer weiteren zweckmäßigen Ausführung ist vorgesehen, dass über den Umfang verteilt eine Mehrzahl von Ableitungskanälen angeordnet ist, die sich zweckmäßigerweise alle nach innen erstrecken, wobei ggf. auch hier die Möglichkeit besteht, dass sich die Ableitungskanäle alle nach außen erstrecken oder ein Teil der Ableitungskanäle nach innen und ein Teil nach außen. Die Ableitungskanäle können gleichmäßig über den Umfang verteilt angeordnet sein, oder aber, gemäß bevorzugter Ausführung, ungleichmäßig, wodurch konstruktiven Gegebenheiten Rechnung getragen werden kann.According to a further expedient embodiment, it is provided that distributed over the circumference a plurality of drainage channels is arranged, which expediently all extend inwards, wherein, where appropriate, there is also the possibility that the drainage channels all extend to the outside or part of the discharge channels inside and part outside. The discharge channels can be distributed uniformly over the circumference, or, according to a preferred embodiment, non-uniformly, whereby constructive circumstances can be taken into account.

Grundsätzlich reicht es aus, den Ableitungskanal nur in einem der beiden zu verbindenden Gehäuseteile vorzusehen, wobei es auch möglich ist, den Ableitungskanal im Bereich der aneinandergrenzenden Stirnflächen der beiden Gehäuseteile sowohl in das erste als auch in das zweite Gehäuseteil einzubringen, oder aber, gemäß weiterer Ausführung, verschiedene Ableitungskanäle vorzusehen, die zum Teil in dem einen und zum Teil in dem anderen Gehäuseteil angeordnet sind. Gemäß vorteilhafter Ausführung befindet sich der Ableitungskanal an der Stirnseite eines Gehäuseteils und ist zur freien Stirnseite hin offen ausgebildet, wobei diese freie Stirnseite im zusammengebauten Zustand vom zweiten Gehäuseteil verschlossen ist, wodurch eine eindeutige Ableitungsrichtung der Schmutzpartikel über den Ableitungskanal definiert ist.Basically, it is sufficient to provide the discharge channel only in one of the two housing parts to be connected, it also being possible to introduce the discharge channel in the region of the adjacent end faces of the two housing parts both in the first and in the second housing part, or, according to further Embodiment to provide different discharge channels, which are arranged partly in one and partly in the other housing part. According to an advantageous embodiment, the discharge channel is located on the front side of a housing part and is open towards the free end, said free end is closed in the assembled state of the second housing part, whereby a clear discharge direction of the dirt particles is defined via the discharge channel.

Zweckmäßigerweise ist der Ableitungskanal als Aussparung ausgebildet, die in die Stirnseite eines Gehäuseteils eingebracht ist und sich radial zwischen der Kontaktfläche des Drehlagerteiles diese Gehäuseteiles und dem Gehäuseinneren erstreckt.Conveniently, the discharge channel is formed as a recess which is introduced into the end face of a housing part and extends radially between the contact surface of the rotary bearing part, this housing part and the housing interior.

Das Rotationslager ist beispielsweise als Rastvorsprung an jedem Gehäuseteil ausgeführt, wobei die Rastvorsprünge an den Gehäuseteilen in eine Rastposition zu bringen sind, derart, dass in Achsrichtung der Gehäuseteile bzw. des Rotationslagers ein wirksamer Formschluss gegeben ist, zugleich aber eine Relativverdrehmöglichkeit um die Längs- bzw. Rotationsachse des Rotationslagers realisiert ist. Der Ableitungskanal erstreckt sich in Radialrichtung bis zur Kontaktfläche zwischen den Rastvorsprüngen an den miteinander zu verbindenden Gehäuseteilen, wobei in Achsrichtung der Ableitungskanal vorzugsweise nur eine Erstreckung aufweist, die der axialen Länge eines Rastvorsprunges entspricht, selbst wenn zwei oder mehr Rastvorsprünge axial hintereinander angeordnet sind.The rotary bearing is designed for example as a latching projection on each housing part, wherein the latching projections are to bring to the housing parts in a latching position, such that in the axial direction of the housing parts or the rotary bearing an effective positive engagement is given, but at the same time a Relativverdrehmöglichkeit about the longitudinal or ., Rotation axis of the rotary bearing is realized. The discharge channel extends in the radial direction to the contact surface between the latching projections on the housing parts to be joined together, wherein in the axial direction of the discharge channel preferably only has an extension corresponding to the axial length of a latching projection, even if two or more latching projections are arranged axially one behind the other.

Weitere Vorteile und zweckmäßige Ausführungen sind den weiteren Ansprüchen, der Figurenbeschreibung und den Zeichnungen zu entnehmen. Es zeigen:

Fig. 1
eine perspektivische Ansicht auf ein Gehäuse einer Handwerkzeugmaschine, bestehend aus einem Motorgehäuse und einem Griffgehäuse,
Fig. 2
eine vergrößerte Darstellung aus dem Bereich der Verbindung zwischen Motorgehäuse und Griffgehäuse, wobei die Verbindung als Rotationslager ausgeführt ist und Ableitungskanäle zur Abfuhr von Schmutzpartikeln aus dem Rotationslager vorgesehen sind,
Fig. 3
eine perspektivische Ansicht der Stirnseite des Motorgehäuses mit in Radialrichtung verlaufenden Ableitungskanälen,
Fig. 4
eine Seitenansicht des Motorgehäuses,
Fig. 5
eine Griffhalbschale als Bestandteil des Griffgehäuses in einer detaillierten Darstellung.
Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:
Fig. 1
a perspective view of a housing of a power tool, consisting of a motor housing and a handle housing,
Fig. 2
an enlarged view of the region of the connection between the motor housing and the handle housing, wherein the compound is designed as a rotary bearing and drainage channels are provided for the removal of dirt particles from the rotary bearing,
Fig. 3
a perspective view of the end face of the motor housing with extending in the radial direction discharge channels,
Fig. 4
a side view of the motor housing,
Fig. 5
a handle half shell as part of the handle housing in a detailed representation.

In den Figuren sind gleiche Bauteile mit gleichen Bezugszeichen versehen.In the figures, the same components are provided with the same reference numerals.

Die in Fig. 1 dargestellte Handwerkzeugmaschine 1, bei der es sich beispielhaft um einen Winkelschleifer handelt, weist ein mehrteiliges Gehäuse 2 auf, von dem ein Motorgehäuse 3 sowie ein zweiteiliges Griffgehäuse 4 mit den beiden Griffhalbschalen 4a und 4b gezeigt sind. Im Motorgehäuse 3 ist ein elektrischer Antriebsmotor 5 aufgenommen, der über eine symbolisch eingezeichnete Antriebsverbindung 6 eine drehbar gelagerte Werkzeugwelle 7 antreibt, an der ein Werkzeug 8 befestig ist. Das Motorgehäuse 3 und das Griffgehäuse 4 sind über eine Verbindungseinrichtung 9 miteinander verbunden.In the Fig. 1 shown hand tool 1, which is for example an angle grinder, has a multi-part housing 2, of which a motor housing 3 and a two-part handle housing 4 with the two handle half shells 4a and 4b are shown. In the motor housing 3, an electric drive motor 5 is received, which drives a rotatably mounted tool shaft 7 via a symbolically drawn drive connection 6, to which a tool 8 is fastened. The motor housing 3 and the handle housing 4 are connected to each other via a connecting device 9.

Die Verbindungseinrichtung 9 umfasst, wie Fig. 2 zu entnehmen, Rast- bzw. Verbindungsteile 10 und 11 an einem der Gehäuseteile, die in zugeordnete, entsprechend ausgebildete Rast- bzw. Verbindungsteile 12 und 13 verrastend eingreifen. Die Rast- bzw. Verbindungsteile 10, 11, 12, 13 sind zahnähnlich mit radialen Vorsprüngen und Ausnehmungen ausgebildet mit Zahnspitzen und einem zwischenliegenden Zahngrund und erstrecken sich in Umfangsrichtung. In Richtung der Verbindungs- und Löserichtung 14 zwischen den Gehäuseteilen 3 und 4 sind die Rast- bzw. Verbindungsteile 10, 11 am Gehäuseteil 4 und die entsprechenden Rast- bzw. Verbindungsausnehmungen 12, 13 am Gehäuseteil 3 axial hintereinander liegend angeordnet, wobei sich die zahnähnlichen Vorsprünge und die entsprechenden Ausnehmungen quer zur Verbindungs- bzw. Löserichtung 14 und damit in Radialrichtung erstrecken.The connecting device 9 comprises, as Fig. 2 can be seen, latching or connecting parts 10 and 11 on one of the housing parts, which engage in associated, correspondingly formed latching or connecting parts 12 and 13 latching. The locking or connecting parts 10, 11, 12, 13 are tooth-like with radial projections and recesses formed with tooth tips and an intermediate tooth base and extending in the circumferential direction. In the direction of the connection and release direction 14 between the housing parts 3 and 4, the latching or connecting parts 10, 11 on the housing part 4 and the corresponding latching or connecting recesses 12, 13 are arranged axially one behind the other on the housing part 3, wherein the tooth-like Projections and the corresponding recesses transverse to Connecting or loosening direction 14 and thus extend in the radial direction.

Wie Fig. 2 weiter zu entnehmen, sind an der dem Griffgehäuse 4 zugewandten Stirnseite des Motorgehäuses 3 mehrere Ableitungskanäle 15 eingebracht, die zur Stirnseite hin offen sind und sich in Achsrichtung, also in Verbindungs- bzw. Löserichtung 14, bis zu dem der Stirnseite unmittelbar benachbarten, sägezahnähnlichen und umlaufenden Zahngrund zwischen den parallel verlaufenden Verbindungsteilen 12 und 13 erstrecken. Somit kommunizieren die Ableitungskanäle 15, die als Aussparungen im Motorgehäuse 3 ausgebildet sind, mit der Verbindungseinrichtung 9 zwischen den Gehäuseteilen 3 und 4. Auf Grund der Rotationssymmetrie von den Verbindungsvorsprüngen 10, 11 und den zugeordneten Verbindungsausnehmungen 12 und 13 erlaubt die Verbindungseinrichtung 9 auch eine Rotation um die Achse, die parallel zur Verbindungs- bzw. Löserichtung 14 liegt; die Verbindungseinrichtung 9 stellt somit zugleich ein Rotationslager dar, das eine Relativdrehmöglichkeit zwischen den zu verbindenden Gehäuseteilen 3 und 4 schafft.As Fig. 2 can be seen further, at the handle housing 4 facing end side of the motor housing 3 a plurality of discharge channels 15 are introduced, which are open to the front side and in the axial direction, ie in connection or release direction 14, to the front side immediately adjacent, sawtooth-like and circumferential tooth base between the parallel connecting parts 12 and 13 extend. Thus, the discharge channels 15, which are formed as recesses in the motor housing 3, communicate with the connecting device 9 between the housing parts 3 and 4. Due to the rotational symmetry of the connecting projections 10, 11 and the associated connecting recesses 12 and 13, the connecting device 9 also allows rotation about the axis which is parallel to the connection or release direction 14; The connecting device 9 thus represents at the same time a rotary bearing, which creates a relative rotational possibility between the housing parts 3 and 4 to be connected.

Bei einer Rotation der beiden Gehäuseteile 3 und 4 relativ zueinander bewegen sich die Verbindungsvorsprünge 10, 11 und die Verbindungsausnehmungen 12 und 13 relativ zueinander in Umfangsrichtung mit dem Effekt, dass sich Schmutzpartikel, welche sich im Bereich der Kontaktfläche zwischen den Verbindungsvorsprüngen und den Verbindungsausnehmungen abgesetzt haben, in Richtung der Ableitungskanäle 15 transportiert und über diese aus der Verbindungseinrichtung bzw. dem Rotationslager abgeleitet werden. Dadurch ist ein Selbstreinigungseffekt in der Verbindungseinrichtung bzw. dem Rotationslager 9 realisiert. Zur Unterstützung dieses Effekts kann an einem Zahnvorsprung oder im Bereich eines Zahngrundes eine Lippe oder ein sonstiger Vorsprung angeordnet sein, die bzw. der abgesetzte Schmutzpartikel in Richtung des Ableitungskanals transportiert.In a rotation of the two housing parts 3 and 4 relative to each other, the connecting projections 10, 11 and the connecting recesses 12 and 13 move relative to each other in the circumferential direction with the effect that dirt particles which have settled in the region of the contact surface between the connecting projections and the connecting recesses are transported in the direction of the discharge channels 15 and derived therefrom from the connecting device or the rotary bearing. As a result, a self-cleaning effect in the connecting device or the rotary bearing 9 is realized. To support this effect, a lip or other protrusion can be arranged on a tooth projection or in the region of a tooth base, which transports the settled dirt particles in the direction of the discharge channel.

Wie Fig. 3 zu entnehmen, erstrecken sich die als Aussparungen ausgebildeten Ableitungskanäle 15 zumindest im Wesentlichen in Radialrichtung, und zwar sowohl radial nach außen bis zur Außenseite der zahnförmigen Verbindungselemente am Gehäuseteil 3 als auch radial nach innen bis zum Gehäuseinneren. Schmutzpartikel, welche sich im Bereich der Kontaktflächen zwischen den ineinandergreifenden, zahnförmigen Verbindungselementen zwischen den Gehäuseteilen 3 und 4 ablagern, können über die Ableitungskanäle 15 radial nach innen transportiert werden. Die Ableitungskanäle 15 kommunizieren zweckmäßig mit einem Strömungskanal, welcher im Gehäuse ausgebildet ist und in Achsrichtung verläuft und in dem Kühlluft zur Kühlung des Motors strömt. Die über die Ableitungskanäle 15 nach innen geführten Schmutzpartikel werden von dem Kühlluftstrom erfasst und mit diesem über Abströmöffnungen im Gehäuse nach außen abgeleitet.As Fig. 3 can be seen extending the recesses formed as recesses channels 15 at least substantially in the radial direction, both radially outward to the outside of the tooth-shaped connecting elements on the housing part 3 and radially inwardly to the housing interior. Dirt particles, which deposit in the region of the contact surfaces between the intermeshing, tooth-shaped connecting elements between the housing parts 3 and 4, can be transported via the discharge channels 15 radially inwards. The discharge channels 15 suitably communicate with a flow channel, which is formed in the housing and extends in the axial direction and flows in the cooling air for cooling the motor. The dirt particles guided inwards via the discharge channels 15 are detected by the cooling air flow and are discharged to the outside with the latter via outflow openings in the housing.

Über den Umfang verteilt können mehrere Ableitungskanäle 15 angebracht sein. Hierbei ist es sowohl möglich, gleiche Abstände zwischen den Ableitungskanälen vorzusehen als auch ungleichmäßige Abstände, so wie dies auch in Fig. 3 dargestellt ist.Distributed over the circumference several discharge channels 15 may be attached. It is both possible to provide equal distances between the discharge channels and uneven distances, as well as in Fig. 3 is shown.

Der vergrößerten Darstellung nach Fig. 4 ist deutlich zu entnehmen, dass sich der Ableitungskanal 15 in Achsrichtung gesehen bis zu dem Zahngrund zwischen benachbarten, radial überstehenden Verbindungsvorsprüngen erstreckt. Zweckmäßigerweise reicht der Ableitungskanal 15 in Achsrichtung nur bis zum ersten Zahngrund, nicht jedoch bis zu dem zweiten Zahngrund, welcher in größerem axialen Abstand zur freien Stirnseite liegt. Gleichwohl kann es zweckmäßig sein, die axiale Erstreckung des Ableitungskanales so groß auszuführen, dass auch der zweite Zahngrund bzw. weitere folgende Zahngründe erreicht werden.The enlarged view after Fig. 4 It can clearly be seen that the discharge channel 15 extends in the axial direction as far as the tooth root between adjacent, radially protruding connecting projections. Appropriately, the discharge channel 15 extends in the axial direction only to the first tooth base, but not up to the second tooth base, which lies at a greater axial distance from the free end face. Nevertheless, it may be expedient to make the axial extent of the discharge channel so great that the second tooth base or further following tooth roots are also achieved.

In Fig. 5 ist ein Detail aus dem Griffgehäuse 4 im Bereich der Verbindungseinrichtung dargestellt, die zugleich das Rotationslager bildet. Zu erkennen sind die zahnförmig ausgebildeten, sich in Radialrichtung erstreckenden Verbindungsvorsprünge 10 und 11, denen aber auf Seiten des Griffgehäuses kein Ableitungskanal zugeordnet ist.In Fig. 5 is a detail of the handle housing 4 shown in the region of the connecting device, which at the same time the Rotary bearing forms. Evident are the tooth-shaped, extending in the radial direction connecting projections 10 and 11, which, however, on the sides of the handle housing no discharge channel is assigned.

Gemäß einer weiteren Ausführung kann es aber zweckmäßig sein, zusätzlich oder alternativ auch im Griffgehäuse zumindest einen oder auch mehrere derartige Ableitungskanäle vorzusehen.According to a further embodiment, however, it may be expedient to additionally or alternatively also provide in the handle housing at least one or more such drainage channels.

Claims (9)

  1. Connecting device/housing combination for a power tool, in particular for a portable power tool, wherein the housing (2) has two separate housing parts (3, 4) which are connected together via the connecting device (9), wherein the connecting device (9) is in the form of a rotary bearing (9) that is capable of relative rotation between the housing parts (3, 4) to be connected,
    characterized in that a discharging channel (15) for dirt particles that leads to the rotary bearing (9) has been introduced into at least one housing part (3), wherein the discharging channel (15) extends at least substantially in a radial direction and leads into a flow duct for cooling air in the housing.
  2. Connecting device/housing combination according to Claim 1 or 1,
    characterized in that a plurality of discharging channels (15) are provided in a manner distributed around the circumference.
  3. Connecting device/housing combination according to Claim 2,
    characterized in that the discharging channels (15) are distributed irregularly around the circumference.
  4. Connecting device/housing combination according to one of Claims 1 to 3,
    characterized in that the discharging channel (15) is embodied as a cutout which has been introduced into the housing part (3).
  5. Connecting device/housing combination according to one of Claims 1 to 4,
    characterized in that the discharging channel (15) is arranged on the end side of the housing part (3).
  6. Connecting device/housing combination according to one of Claims 1 to 5,
    characterized in that the rotary bearing (9) on the housing parts (3, 4) comprises in each case at least one latching protrusion (10, 11, 12, 13), wherein the latching protrusions are intended to be brought into a latching position with a form fit acting in an axial direction of the housing parts (3, 4).
  7. Connecting device/housing combination according to Claim 6,
    characterized in that in each case at least two latching protrusions (10, 11; 12, 13) that are arranged axially one behind the other are arranged on the housing parts (3, 4).
  8. Connecting device/housing combination according to Claim 7,
    characterized in that the discharging channel (15) extends in an axial direction only along the axial length of a latching protrusion (10, 12).
  9. Power tool, in particular portable power tool, having a connecting device/housing combination according to one of Claims 1 to 8.
EP09732883.5A 2008-04-18 2009-03-19 Connecting device/housing combination for a machine tool, in particular for a handheld machine tool Active EP2268457B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810001254 DE102008001254A1 (en) 2008-04-18 2008-04-18 Connecting device-housing combination for a machine tool, in particular for a hand tool
PCT/EP2009/053224 WO2009127489A1 (en) 2008-04-18 2009-03-19 Connecting device/housing combination for a machine tool, in particular for a handheld machine tool

Publications (2)

Publication Number Publication Date
EP2268457A1 EP2268457A1 (en) 2011-01-05
EP2268457B1 true EP2268457B1 (en) 2017-08-09

Family

ID=40626666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09732883.5A Active EP2268457B1 (en) 2008-04-18 2009-03-19 Connecting device/housing combination for a machine tool, in particular for a handheld machine tool

Country Status (5)

Country Link
EP (1) EP2268457B1 (en)
CN (1) CN102006973B (en)
DE (1) DE102008001254A1 (en)
RU (1) RU2516328C2 (en)
WO (1) WO2009127489A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6676557B2 (en) * 2001-01-23 2004-01-13 Black & Decker Inc. First stage clutch
US20060260141A1 (en) * 2001-12-18 2006-11-23 Black & Decker, Inc. Bearing for a reciprocating shaft of a reciprocating saw
DE10208492A1 (en) * 2002-02-27 2003-09-04 Bsh Bosch Siemens Hausgeraete Slicer with a drive unit
EP1369208B1 (en) * 2002-06-07 2008-04-23 Black & Decker Inc. A power tool provided with a locking mechanism
EP1378324A1 (en) * 2002-07-03 2004-01-07 Sparky Eltos AG Fixing device for a rear handle for electrical tools
US20040148789A1 (en) * 2002-08-20 2004-08-05 Gist Leslie D. Rotatable handle for reciprocating saws
EP1657457B1 (en) * 2004-11-10 2008-05-21 BLACK & DECKER INC. Knuckle joint and release/locking mechanism therefor
JP4575223B2 (en) * 2005-04-20 2010-11-04 株式会社マキタ Rotating tool
WO2007121534A1 (en) * 2006-04-26 2007-11-01 Demain Technology Pty Ltd A handle assembly for a power tool

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN102006973A (en) 2011-04-06
RU2010146704A (en) 2012-05-27
CN102006973B (en) 2015-02-11
WO2009127489A1 (en) 2009-10-22
DE102008001254A1 (en) 2009-10-22
RU2516328C2 (en) 2014-05-20
EP2268457A1 (en) 2011-01-05

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