EP1842625B1 - Portable electric grinding machine - Google Patents

Portable electric grinding machine Download PDF

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Publication number
EP1842625B1
EP1842625B1 EP20070002153 EP07002153A EP1842625B1 EP 1842625 B1 EP1842625 B1 EP 1842625B1 EP 20070002153 EP20070002153 EP 20070002153 EP 07002153 A EP07002153 A EP 07002153A EP 1842625 B1 EP1842625 B1 EP 1842625B1
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EP
European Patent Office
Prior art keywords
fan
bearing housing
electric hand
hand tool
dust
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EP20070002153
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German (de)
French (fr)
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EP1842625A1 (en
Inventor
Jürgen Blickle
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Metabowerke GmbH and Co
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Metabowerke GmbH and Co
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Publication of EP1842625A1 publication Critical patent/EP1842625A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • 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 an electric hand grinder, in particular an eccentric grinder or sander, according to the preamble of claim 1.
  • Such electric hand tool machines are essentially known in two types.
  • so-called two-shell machines are offered in which the housing is formed of two shells and in these housing shells for a storage of the drive shaft and the fan takes place and on the other hand, the drive motor is housed.
  • such machines are offered in pot construction in which a separate bearing housing, which is cup-shaped, with a machine housing in which the motor is arranged and which also serves as a handle is connected.
  • These bearing housings are designed in particular as metal housing.
  • Electric hand grinders usually have a fan which is mounted in the bearing housing for dust extraction or separation, with an external Staubabscheide device is connected via an opening provided in the bearing housing suction.
  • the resulting dust is here z. B. caused by the abrasion of the tool.
  • a dust extraction is further from the EP 1 129 822 B1 known, which has the task to provide an optimal and easy to manufacture seal the gearbox and drive parts on the one hand and a self-extraction of grinding dust.
  • the DE 36 20 136 A1 shows a hand grinder with a device for aspirating comprising a two-shell housing, which is provided that via a double fan, which carries fan blades rows on both sides of a separation surface, via a single fan both the engine cooling and a dust extraction can take place. Both air streams are then removed through a vent pipe.
  • an electric hand grinder according to the preamble of claim 1 with a bearing housing and a machine housing known, wherein the bearing housing is formed here as a two-shell housing and composed of two housing shells. It is already known from the document to provide a fan as a double fan having fan blades on both sides of a parting surface, one set of fan blades dust extraction or separation and the other set of engine cooling is used and divided by the separation surface, the bearing housing into two fan chambers is. In this case, openings are provided for the removal of air in the two-shell gear housing.
  • the invention now has the task of further improving an electric hand grinding machine, in particular an eccentric grinder or sander, with a pot-shaped bearing housing to the effect that a low overall height can be achieved.
  • the invention solves this object by an electric hand grinder with the features of claim 1, wherein the fan is designed as a double fan and has on both axial sides of a separating surface fan blades, one set of fan blades dust separation and the other set of engine cooling and serves through the separation surface the bearing housing is separated into two fan chambers, wherein in the bearing housing in the region of the fan chamber of the engine cooling at least one opening for discharging the cooling air is provided.
  • a corresponding arrangement is not yet known for electric hand grinders in the so-called pot construction. Rather, in such electric power tool machines always the cooling air for the engine cooling in the boundary region between the motor housing and subsequent bearing housing blown.
  • the height can now be significantly reduced.
  • a double fan which has fan blades on both surfaces separated by a separating surface, and the provision of at least one opening in the bearing housing in the region of the fan chamber of the engine cooling, the bearing housing can be attached directly to the machine housing in the axial direction, without air gaps to the outlet of the engine cooling air needed.
  • the openings extend over part of the circumference of the cup-shaped bearing housing, preferably over a quarter, in particular over one third and in particular half of the circumference.
  • the openings may be slit-shaped, particularly preferably two or more openings, which are in particular arranged symmetrically on the machine, may be provided.
  • the fan chambers are sealed against each other. This is done z. B. by means of a seal which corresponds to the separation surface of the fan and thus leads to a sealing of the fan chambers to each other.
  • the fan if it is an eccentric grinder, at the same time serves for mass balance by applied weights.
  • the fan chambers of dust extraction or separation with Staubabsaugö Maschinenen in be in fluid communication with the electrically driven tool.
  • this fan chamber corresponds to air intake openings, which are provided in the motor housing and are preferably located in the axial direction on the opposite side of the motor in the motor housing. There is also a flow connection between the openings in the bearing housing and these air intake openings. Another flow connection exists between the Staubabsaugö réelle in the fan chamber of the dust extraction on the fan chamber with the Staubansaugötechnischen in the tool.
  • the fan can be driven via the drive shaft.
  • the bearing housing is a metal housing made of an aluminum casting.
  • the at least one opening can be formed so that the part in the casting process is as easy as possible to produce, possibly without requiring additional slide in the mold, which make a removal possible.
  • FIG. 1 shows an eccentric grinder in a section along a drive shaft 10.
  • the eccentric grinder in this case comprises a machine housing 12 and a bearing housing 14, wherein the bearing housing is designed as an aluminum casting and in particular to FIG. 2 is explained in more detail.
  • the bearing housing 14 in this case has a cup-shaped shape and joins in the axial direction in the direction of a trained as a grinding wheel tool 16 to the machine housing 12 at.
  • the tool 16 is disposed releasably rotatably driven, wherein the tool can also perform an eccentric movement, which allows removal from a surface.
  • the drive device and the device for the eccentric movement are formed in a conventional manner.
  • an electric motor 18 is provided which serves to drive the drive shaft 10.
  • a main handle (not shown) and also not shown auxiliary handle are provided on the machine housing 12, which serve to guide and handle the grinder.
  • air inlet openings 20 are provided, into which air can be sucked in the direction of arrow 21 for cooling the electric motor 18.
  • the cooling air which is identified by the arrow 21, flows in the axial direction along the direction of the arrow 22 and thus serves to cool in particular an armature and a field of the motor 18th
  • the fan 24 has a perpendicular to the shaft 10 extending separating surface 26, both sides of which fan blade sets 28 and 30 are provided.
  • a seal is further provided, which shares the bearing housing 14 in two fan chambers 32 and 34 together with the separating surface 26.
  • the one fan chamber 34 is assigned to the engine cooling and the other fan chamber 32 of the dust extraction or - deposition.
  • the air flow which now passes along the motor 18, is directed through flow openings 38 in the region of the bearing housing 14 onto the fan blades 28 and blown out through them through air outlet openings 40 in the bearing housing 14.
  • dust is sucked together with dust through openings in the tool serving as the dust suction, indicated at 42, and the fan blades 30 in the fan chamber 32 associated with the dust extraction or separation , directed and discharged from here via an external dust extraction or separation, not shown in the illustration.
  • This can be saved by the provision of the fan 24 as a double fan height in the axial direction, since between the machine housing 12 and bearing housing 14 no gap must be provided for blowing air to the engine cooling. It is also not necessary that a second fan is used.
  • FIG. 2 now shows the bearing housing 14 in a three-dimensional view, in which case the flow openings 38 in the cup-shaped bearing housing 14 and the outflow openings 40 for the cooling air of the engine well see are.
  • the two openings 40 extend in a symmetrical arrangement to an axis of the arrangement of FIG. 1 over a portion of the circumference of the bearing housing 14.
  • the port for external dust extraction or deposition indicated here at 46.
  • the cup-shaped bearing housing 14 has a passage opening 48 for the drive and the drive shaft 10.
  • two ribs 50 are mounted, which serve to position the two shells of the machine housing 12, thus enabling a safe and easy assembly of the device.
  • a receptacle 52 for a setting knob can be seen, with which a stroke adjustment and thus an adjustment of the eccentricity of the tool 16 is possible.
  • an eccentric grinder in pot construction or other electric hand grinder in pot design can be provided, which requires a small height and realized at the same time Schau only a fan motor cooling and dust extraction or separation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Description

Die Erfindung betrifft eine Elektrohandschleifmaschine insbesondere einen Exzenterschleifer oder Sander nach dem Oberbegriff des Anspruchs 1. Derartige Elektrohandwerkzeugmaschinen sind im Wesentlichen in zwei Bauarten bekannt. So werden zum einen sogenannte Zweischalenmaschinen angeboten, bei denen das Gehäuse aus zwei Schalen gebildet ist und in diesen Gehäuseschalen zum einen die Lagerung der Antriebswelle sowie des Lüfters erfolgt und zum anderen der Antriebsmotor untergebracht ist. Darüber hinaus werden solche Maschinen in Topfbauweise angeboten, bei denen ein separates Lagergehäuse, das topfförmig ausgebildet ist, mit einem Maschinengehäuse, in dem der Motor angeordnet ist und das zugleich als Griff dient, verbunden ist. Diese Lagergehäuse sind insbesondere als Metallgehäuse ausgebildet.The invention relates to an electric hand grinder, in particular an eccentric grinder or sander, according to the preamble of claim 1. Such electric hand tool machines are essentially known in two types. Thus, on the one hand so-called two-shell machines are offered in which the housing is formed of two shells and in these housing shells for a storage of the drive shaft and the fan takes place and on the other hand, the drive motor is housed. In addition, such machines are offered in pot construction in which a separate bearing housing, which is cup-shaped, with a machine housing in which the motor is arranged and which also serves as a handle is connected. These bearing housings are designed in particular as metal housing.

Elektrische Handschleifmaschinen besitzen in aller Regel einen Lüfter, der im Lagergehäuse zur Staubabsaugung oder -abscheidung gelagert ist, der mit einer externen Staubabscheide-Einrichtung über eine im Lagergehäuse vorgesehene Absaugöffnung verbindbar ist. Der entstehende Staub wird hierbei z. B. durch den Abrieb des Werkzeugs verursacht.Electric hand grinders usually have a fan which is mounted in the bearing housing for dust extraction or separation, with an external Staubabscheide device is connected via an opening provided in the bearing housing suction. The resulting dust is here z. B. caused by the abrasion of the tool.

Als externe Staubabscheide-Einrichtungen können dabei Absaugeinrichtungen, aber auch Staubauffangbehälter dienen.As external Staubabscheide facilities can serve suction, but also dust collection.

Es ist weiterhin bekannt, eine zusätzliche Motorkühlung vorzusehen, um über einen Kühlluftstrom eine Überhitzung des Antriebs zu verhindern, insbesondere wenn dieser stark belastet ist.It is also known to provide an additional engine cooling to prevent over a cooling air flow overheating of the drive, especially when it is heavily loaded.

Aus der DE 103 29 828 A1 ist es beispielsweise bekannt, zwei Kühleinrichtungen mit zwei separaten Kühlluftströmen einzusetzen. Eine derartige Ausgestaltung ist jedoch aufgrund der zwei notwendigen Kühleinrichtungen verhältnismäßig aufwendig. Ferner handelt es sich bei der Elektrohandwerkzeugmaschine gemäß dem Stand der Technik um eine Zweischalenmaschine, die kein topfförmiges Lagergehäuse aufweist.From the DE 103 29 828 A1 For example, it is known to use two cooling devices with two separate cooling air streams. However, such a configuration is relatively expensive due to the two necessary cooling devices. Further, in the electric hand tool machine according to the prior art is a two-shell machine, which has no cup-shaped bearing housing.

Eine Staubabsaugung ist des Weiteren aus der EP 1 129 822 B1 bekannt, die sich die Aufgabe stellt, eine optimale und leicht herstellbare Abdichtung der Getriebe und Antriebsteile einerseits und eine Eigenabsaugung von Schleifstaub zu ermöglichen.A dust extraction is further from the EP 1 129 822 B1 known, which has the task to provide an optimal and easy to manufacture seal the gearbox and drive parts on the one hand and a self-extraction of grinding dust.

Auch die DE 36 20 136 A1 zeigt eine Handschleifmaschine mit einer Vorrichtung zum Absaugen umfassend ein Zweischalengehäuse, bei dem vorgesehen ist, dass über einen Doppellüfter, der auf beiden Seiten einer Trennfläche Lüfterflügelreihen trägt, über einen einzelnen Lüfter sowohl die Motorkühlung als auch eine Staubabsaugung erfolgen kann. Beide Luftströme werden dann durch einen Abluftstutzen abgeführt.Also the DE 36 20 136 A1 shows a hand grinder with a device for aspirating comprising a two-shell housing, which is provided that via a double fan, which carries fan blades rows on both sides of a separation surface, via a single fan both the engine cooling and a dust extraction can take place. Both air streams are then removed through a vent pipe.

Schließlich ist aus der EP 0 671 244 A1 eine Elektrohandschleifmaschine gemäß dem Oberbegriff des Anspruchs 1 mit einem Lagergehäuse und einem Maschinengehäuse bekannt, wobei das Lagergehäuse hier als ein Zweischalengehäuse ausgebildet und aus zwei Gehäuseschalen zusammengesetzt ist. Dabei ist es aus dem Dokument bereits bekannt, als Lüfter einen Doppellüfter vorzusehen, der auf beiden Seiten einer Trennfläche Lüfterschaufeln aufweist, wobei ein Satz Lüfterschaufeln der Staubabsaugung oder -abscheidung und der andere Satz einer Motorkühlung dient und durch die Trennfläche das Lagergehäuse in zwei Lüfterkammern geteilt ist. Dabei sind im zweischaligen Getriebegehäuse Öffnungen zur Abfuhr der Luft vorgesehen.Finally, out of the EP 0 671 244 A1 an electric hand grinder according to the preamble of claim 1 with a bearing housing and a machine housing known, wherein the bearing housing is formed here as a two-shell housing and composed of two housing shells. It is already known from the document to provide a fan as a double fan having fan blades on both sides of a parting surface, one set of fan blades dust extraction or separation and the other set of engine cooling is used and divided by the separation surface, the bearing housing into two fan chambers is. In this case, openings are provided for the removal of air in the two-shell gear housing.

Die Erfindung stellt sich nun die Aufgabe, eine Elektrohandschleifmaschine, insbesondere einen Exzenterschleifer oder Sander, mit einem topfförmigen Lagergehäuse dahingehend weiter zu verbessern, dass eine geringe Bauhöhe erreicht werden kann.The invention now has the task of further improving an electric hand grinding machine, in particular an eccentric grinder or sander, with a pot-shaped bearing housing to the effect that a low overall height can be achieved.

Die Erfindung löst diese Aufgabe durch eine Elektrohandschleifmaschine mit den Merkmalen des Anspruchs 1, bei der der Lüfter als Doppellüfter ausgebildet ist und auf beiden axialen Seiten einer Trennfläche Lüfterschaufeln aufweist, wobei ein Satz Lüfterschaufeln der Staubabscheidung und der andere Satz einer Motorkühlung dient und durch die Trennfläche das Lagergehäuse in zwei Lüfterkammern getrennt ist, wobei in dem Lagergehäuse in dem Bereich der Lüfterkammer der Motorkühlung mindestens eine Öffnung zum Abführen der Kühlluft vorgesehen ist. Eine entsprechende Anordnung ist für Elektrohandschleifmaschinen in der sogenannten Topfbauweise bisher nicht bekannt. Vielmehr wird bei derartigen Elektrohandwerkzeugmaschinen stets die Kühlluft für die Motorkühlung im Grenzbereich zwischen Motorgehäuse und anschließendem Lagergehäuse ausgeblasen. Auf diese Weise entsteht jedoch ein erhöhter Bauraumbedarf, insbesondere eine erhöhte Maschinenhöhe, die sich nachteilig auf die Möglichkeit des Einsatzes der Maschine auch in schwierigen Bearbeitungssituationen auswirkt. Sofern nachstehend von Staubabsaugung oder -abscheidung gesprochen wird, soll hierdurch sowohl eine externe Absaugung als auch eine Abscheidung umfasst sein. Die Begriffe werden synonym verwendet.The invention solves this object by an electric hand grinder with the features of claim 1, wherein the fan is designed as a double fan and has on both axial sides of a separating surface fan blades, one set of fan blades dust separation and the other set of engine cooling and serves through the separation surface the bearing housing is separated into two fan chambers, wherein in the bearing housing in the region of the fan chamber of the engine cooling at least one opening for discharging the cooling air is provided. A corresponding arrangement is not yet known for electric hand grinders in the so-called pot construction. Rather, in such electric power tool machines always the cooling air for the engine cooling in the boundary region between the motor housing and subsequent bearing housing blown. In this way, however, results in an increased space requirement, in particular an increased machine height, which adversely affects the possibility of using the machine, even in difficult machining situations. As far as dust extraction or separation is mentioned below, this is intended to encompass both external suction and deposition. The terms are used synonymously.

Durch die nun vorgesehene Ausgestaltung des Lüfters als Doppellüfter, wie es seither lediglich für zwei Schalengehäuse von Elektrohandschleifmaschinen bekannt war, kann nun die Bauhöhe deutlich reduziert werden. Zugleich mit der Vorsehung eines Doppellüfters, der auf beiden durch eine Trennfläche getrennten Flächen Lüfterschaufeln aufweist, und der Vorsehung mindestens einer Öffnung im Lagergehäuse im Bereich der Lüfterkammer der Motorkühlung kann das Lagergehäuse unmittelbar an das in axialer Richtung hieran anschließende Maschinengehäuse angesetzt werden, ohne dass Luftspalte zum Auslass der Motorkühlungsluft benötigt werden.Due to the now proposed design of the fan as a double fan, as it has since been known only for two shell housing of electric hand grinders, the height can now be significantly reduced. At the same time as Providence a double fan, which has fan blades on both surfaces separated by a separating surface, and the provision of at least one opening in the bearing housing in the region of the fan chamber of the engine cooling, the bearing housing can be attached directly to the machine housing in the axial direction, without air gaps to the outlet of the engine cooling air needed.

Dabei kann vorzugsweise vorgesehen sein, dass die Öffnungen sich über einen Teil des Umfangs des topfförmigen Lagergehäuses erstrecken, vorzugsweise über ein Viertel, insbesondere über ein Drittel und insbesondere die Hälfte des Umfangs. Insbesondere können die Öffnungen schlitzförmig ausgebildet sein, besonders bevorzugt können zwei oder mehr Öffnungen, die insbesondere symmetrisch an der Maschine angeordnet sind, vorgesehen sein.
Des Weiteren ist vorgesehen, dass die Lüfterkammern gegeneinander abgedichtet sind. Dies erfolgt z. B. mittels einer Dichtung, die mit der Trennfläche des Lüfters korrespondiert und hier so zu einer Abdichtung der Lüfterkammern zueinander führt.It can preferably be provided that the openings extend over part of the circumference of the cup-shaped bearing housing, preferably over a quarter, in particular over one third and in particular half of the circumference. In particular, the openings may be slit-shaped, particularly preferably two or more openings, which are in particular arranged symmetrically on the machine, may be provided.
Furthermore, it is provided that the fan chambers are sealed against each other. This is done z. B. by means of a seal which corresponds to the separation surface of the fan and thus leads to a sealing of the fan chambers to each other.

Es kann auch vorgesehen sein, dass der Lüfter, sofern es sich um einen Exzenterschleifer handelt, gleichzeitig zum Massenausgleich durch aufgebrachte Gewichte dient.It can also be provided that the fan, if it is an eccentric grinder, at the same time serves for mass balance by applied weights.

Ferner kann vorgesehen sein, dass die Lüfterkammern der Staubabsaugung oder -abscheidung mit Staubabsaugöffnungen in dem elektrisch antreibbaren Werkzeug in Strömungsverbindung stehen. Es können zusätzliche Nebenansaugöffnungen vorgesehen sein, die verhindern, dass bei Anschluss der Absaugöffnung an eine externe Staubabscheidung und insbesondere Absaugung es zu einem Festsaugen aufgrund des entstehenden Vakuums des Werkzeugs an der zu bearbeitenden Fläche und somit zu einer Beeinträchtigung der Arbeit mit dem Werkzeug kommen kann.Furthermore, it can be provided that the fan chambers of dust extraction or separation with Staubabsaugöffnungen in be in fluid communication with the electrically driven tool. There may be additional Nebenansaugöffnungen be provided to prevent that when connecting the suction to an external dust separation and suction in particular it can lead to a firm eye due to the resulting vacuum of the tool on the surface to be machined and thus to a deterioration of work with the tool.

Bezüglich der Lüfterkammer der Motorkühlung ist vorgesehen, dass diese Lüfterkammer mit Luftansaugöffnungen korrespondiert, die im Motorgehäuse vorgesehen sind und sich vorzugsweise in axialer Richtung auf der gegenüberliegenden Seite des Motors im Motorgehäuse befinden. Zwischen den Öffnungen im Lagergehäuse und diesen Luftansaugöffnungen besteht ebenfalls eine Strömungsverbindung. Eine weitere Strömungsverbindung besteht zwischen der Staubabsaugöffnung in der Lüfterkammer der Staubabsaugung über die Lüfterkammer mit den Staubansaugöffnungen im Werkzeug.With respect to the fan chamber of the engine cooling is provided that this fan chamber corresponds to air intake openings, which are provided in the motor housing and are preferably located in the axial direction on the opposite side of the motor in the motor housing. There is also a flow connection between the openings in the bearing housing and these air intake openings. Another flow connection exists between the Staubabsaugöffnung in the fan chamber of the dust extraction on the fan chamber with the Staubansaugöffnungen in the tool.

Des Weiteren ist vorgesehen, dass der Lüfter über die Antriebswelle antreibbar ist.Furthermore, it is provided that the fan can be driven via the drive shaft.

Beim Lagergehäuse handelt es sich um ein Metallgehäuse aus einem Aluminiumgussteil. Die mindestens eine Öffnung kann dabei so ausgebildet sein, dass das Teil im Gussverfahren möglichst einfach herstellbar ist, gegebenenfalls ohne zusätzliche Schieber in der Gussform zu benötigen, die ein Entfernen möglich machen.The bearing housing is a metal housing made of an aluminum casting. The at least one opening can be formed so that the part in the casting process is as easy as possible to produce, possibly without requiring additional slide in the mold, which make a removal possible.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den übrigen Anmeldungsunterlagen.Further advantages and features of the invention will become apparent from the remaining application documents.

Die Erfindung soll im Folgenden anhand einer Zeichnung näher erläutert werden. Dabei zeigt:

Figur 1
eine Elektrohandschleifmaschine im Schnitt und
Figur 2
ein Lagergehäuse in einer dreidimensionalen Darstellung.
The invention will be explained in more detail below with reference to a drawing. Showing:
FIG. 1
an electric hand grinder on average and
FIG. 2
a bearing housing in a three-dimensional representation.

Figur 1 zeigt einen Exzenterschleifer in einem Schnitt entlang einer Antriebswelle 10. Der Exzenterschleifer umfasst hierbei ein Maschinengehäuse 12 sowie ein Lagergehäuse 14, wobei das Lagergehäuse als Aluminiumgussteil ausgeführt ist und insbesondere zu Figur 2 näher erläutert wird. Das Lagergehäuse 14 besitzt hierbei eine topfförmige Form und schließt sich in axialer Richtung in Richtung auf ein als Schleifscheibe ausgebildetes Werkzeug 16 an das Maschinengehäuse 12 an. FIG. 1 shows an eccentric grinder in a section along a drive shaft 10. The eccentric grinder in this case comprises a machine housing 12 and a bearing housing 14, wherein the bearing housing is designed as an aluminum casting and in particular to FIG. 2 is explained in more detail. The bearing housing 14 in this case has a cup-shaped shape and joins in the axial direction in the direction of a trained as a grinding wheel tool 16 to the machine housing 12 at.

An einem Ende der Antriebswelle 10 ist das Werkzeug 16 drehend antreibbar lösbar angeordnet, wobei das Werkzeug zugleich eine exzentrische Bewegung durchführen kann, die einen Abtrag von einer Oberfläche ermöglicht. Die Antriebseinrichtung sowie die Einrichtung für die exzentrische Bewegung sind dabei in herkömmlicher Weise ausgebildet.At one end of the drive shaft 10, the tool 16 is disposed releasably rotatably driven, wherein the tool can also perform an eccentric movement, which allows removal from a surface. The drive device and the device for the eccentric movement are formed in a conventional manner.

Im Maschinengehäuse 12 ist ein Elektromotor 18 vorgesehen, der zum Antrieb der Antriebswelle 10 dient. Darüber hinaus sind am Maschinengehäuse 12 ein Haupthandgriff (nicht dargestellt) sowie ein ebenfalls nicht dargestellter Zusatzhandgriff vorgesehen, die zur Führung und Handhabung des Schleifgerätes dienen.In the machine housing 12, an electric motor 18 is provided which serves to drive the drive shaft 10. In addition, a main handle (not shown) and also not shown auxiliary handle are provided on the machine housing 12, which serve to guide and handle the grinder.

In dem der Schleifscheibe 16 abgewandten Bereich des Maschinengehäuses 12 sind Lufteinlassöffnungen 20 vorgesehen, in die Luft in Pfeilrichtung 21 eingesaugt werden kann, zur Kühlung des Elektromotors 18. Die Kühlluft, die mit dem Pfeil 21 gekennzeichnet ist, strömt dabei in axialer Richtung entlang der Richtung des Pfeiles 22 und dient so zur Kühlung insbesondere eines Ankers und eines Feldes des Motors 18.In the region of the machine housing 12 facing away from the grinding wheel 16, air inlet openings 20 are provided, into which air can be sucked in the direction of arrow 21 for cooling the electric motor 18. The cooling air, which is identified by the arrow 21, flows in the axial direction along the direction of the arrow 22 and thus serves to cool in particular an armature and a field of the motor 18th

Die Ansaugung der Luft 21 erfolgt mittels eines Lüfters 24, der als sogenannter Doppellüfter ausgebildet ist. Hierbei weist der Lüfter 24 eine senkrecht zur Welle 10 verlaufende Trennfläche 26 auf, beidseits derer Lüfterschaufelsätze 28 und 30 vorgesehen sind.The suction of the air 21 by means of a fan 24, which is designed as a so-called double fan. Here, the fan 24 has a perpendicular to the shaft 10 extending separating surface 26, both sides of which fan blade sets 28 and 30 are provided.

Im Bereich der Trennfläche 26 ist ferner eine Dichtung vorgesehen, die gemeinsam mit der Trennfläche 26 das Lagergehäuse 14 in zwei Lüfterkammern 32 und 34 teilt. Hierbei ist die eine Lüfterkammer 34 der Motorkühlung zugeordnet und die andere Lüfterkammer 32 der Staubabsaugung oder - abscheidung.In the region of the separating surface 26, a seal is further provided, which shares the bearing housing 14 in two fan chambers 32 and 34 together with the separating surface 26. Here, the one fan chamber 34 is assigned to the engine cooling and the other fan chamber 32 of the dust extraction or - deposition.

Der Luftstrom, der nun an dem Motor 18 entlangstreicht, wird durch Strömungsöffnungen 38 im Bereich des Lagergehäuses 14 auf die Lüfterschaufeln 28 geleitet und durch diese durch Luftauslassöffnungen 40 im Lagergehäuse 14 ausgeblasen. Auf der anderen Seite der Trennfläche wird zur Staubabsaugung oder -abscheidung Luft gemeinsam mit Staub durch Öffnungen im Werkzeug, die der Staubansaugung dienen und mit 42 bezeichnet sind, angesogen und auf die Lüfterschaufeln 30 in der Lüfterkammer 32, die der Staubabsaugung oder -abscheidung zugeordnet ist, geleitet und von hier über eine in der Darstellung nicht gezeigte externe Staubabsaugung oder - abscheidung abgeführt. Hierbei kann durch die Vorsehung des Lüfters 24 als Doppellüfter Bauhöhe in axialer Richtung eingespart werden, da zwischen Maschinengehäuse 12 und Lagergehäuse 14 kein Spalt vorgesehen sein muss, zum Ausblasen von Luft zur Motorkühlung. Es ist auch nicht notwendig, dass ein zweiter Lüfter eingesetzt wird.The air flow, which now passes along the motor 18, is directed through flow openings 38 in the region of the bearing housing 14 onto the fan blades 28 and blown out through them through air outlet openings 40 in the bearing housing 14. On the other side of the parting surface, for dust extraction, dust is sucked together with dust through openings in the tool serving as the dust suction, indicated at 42, and the fan blades 30 in the fan chamber 32 associated with the dust extraction or separation , directed and discharged from here via an external dust extraction or separation, not shown in the illustration. This can be saved by the provision of the fan 24 as a double fan height in the axial direction, since between the machine housing 12 and bearing housing 14 no gap must be provided for blowing air to the engine cooling. It is also not necessary that a second fan is used.

Weiterhin sind Nebenansaugöffnungen 44 vorgesehen, die einer Sekundärluftansaugung dienen, so dass es bei Anschluss einer externen Staubabsaugung oder -abscheidung nicht zu einem Festsaugen des Werkzeugs 16 an einer zu bearbeitenden Oberfläche kommt aufgrund des entstehenden Vakuums.Further Nebenansaugöffnungen 44 are provided which serve a Sekundärluftansaugung, so that it does not come on connection of an external Staubabsaugung or deposition to a solid eyes of the tool 16 on a surface to be machined due to the resulting vacuum.

Figur 2 zeigt nun das Lagergehäuse 14 in einer dreidimensionalen Darstellung, wobei hier die Strömungsöffnungen 38 im topfförmigen Lagergehäuse 14 sowie die Ausströmöffnungen 40 für die Kühlluft des Motors gut zu sehen sind. Die zwei Öffnungen 40 erstrecken sich dabei in symmetrischer Anordnung zu einer Achse der Anordnung von Figur 1 über einen Teil des Umfangs des Lagergehäuses 14. In dieser Figur ist ferner der Anschluss für die externe Staubabsaugung oder -abscheidung, der hier mit 46 bezeichnet ist, gezeigt. FIG. 2 now shows the bearing housing 14 in a three-dimensional view, in which case the flow openings 38 in the cup-shaped bearing housing 14 and the outflow openings 40 for the cooling air of the engine well see are. The two openings 40 extend in a symmetrical arrangement to an axis of the arrangement of FIG. 1 over a portion of the circumference of the bearing housing 14. Also shown in this figure is the port for external dust extraction or deposition, indicated here at 46.

Weiterhin weist das topfförmige Lagergehäuse 14 eine Durchtrittsöffnung 48 für den Antrieb und die Antriebswelle 10 auf. Auf der in Einbaurichtung nach oben weisenden Seite des topfförmigen Lagergehäuses 14, das mit dem Maschinengehäuse korrespondiert, sind zwei Rippen 50 angebracht, die der Positionierung der zwei Schalen des Maschinengehäuses 12 dienen und so ein sicheres und einfaches Zusammenbauen des Gerätes ermöglichen. Des Weiteren ist eine Aufnahme 52 für einen Stellknopf zu erkennen, mit dem eine Hubverstellung und damit eine Einstellung der Exzentrizität des Werkzeugs 16 möglich ist.Furthermore, the cup-shaped bearing housing 14 has a passage opening 48 for the drive and the drive shaft 10. In the installation direction upwardly facing side of the cup-shaped bearing housing 14, which corresponds to the machine housing, two ribs 50 are mounted, which serve to position the two shells of the machine housing 12, thus enabling a safe and easy assembly of the device. Furthermore, a receptacle 52 for a setting knob can be seen, with which a stroke adjustment and thus an adjustment of the eccentricity of the tool 16 is possible.

Auf die vorstehend beschriebene Weise kann ein Exzenterschleifer in Topfbauweise oder eine sonstige Elektrohandschleifmaschine in Topfbauweise bereitgestellt werden, die eine geringe Bauhöhe benötigt und gleichzeitig bei Vorsehung nur eines Lüfters eine Motorkühlung sowie eine Staubabsaugung oder -abscheidung realisiert.In the manner described above, an eccentric grinder in pot construction or other electric hand grinder in pot design can be provided, which requires a small height and realized at the same time Providence only a fan motor cooling and dust extraction or separation.

Claims (8)

  1. Electric hand tool grinder, in particular, orbital grinder or sander, comprising a machine housing (12) and a dish-shaped bearing housing (14) which is connected with the machine housing (12), in which a motor (18) is arranged to provide an electrical drive to a connected tool (16) rotated by means of an axial shaft (10) whereby a fan (24) is disposed in the bearing housing (14) for dust extraction or separation which can be connected to an external dust separation device through an extraction opening (46) provided in the bearing housing (14), by means of which said fan (26) as a double fan has fan blades (28, 30) on both sides of a joint face (26), whereby one set of fan blades (30) provides extraction or separation of the dust and the other set (28) cools said motor and the bearing housing (14) is divided into two fan chambers (32, 34) by the joint face (26), whereby at least one opening (40) for the evacuation of cooling air is provided in the bearing housing (14) in the region of the fan chamber (34) for motor cooling, characterised in that the bearing housing is a metallic housing made from an aluminium casting.
  2. Electric hand tool grinder in accordance with claim 1, characterised in that the at least one opening (40) extends over a part of the periphery of the dish-shaped bearing housing (14) and in particular is shaped as a slot.
  3. Electric hand tool grinder in accordance with claim 1 or 2, characterised in that two or more openings (40) are provided.
  4. Electric hand tool grinder in accordance with one of claims 1 to 3, characterised in that the fan chambers (32, 34) are sealed from each other.
  5. Electric hand tool grinder in accordance with one of the preceding claims, characterised in that there is a flow connection between the fan chamber (32) providing extraction or separation of the dust and dust extraction openings (42) in the electrically-driven tool (16).
  6. Electric hand tool grinder in accordance with one of the preceding claims, characterised in that there is a flow connection between the fan chamber (34) providing motor cooling and air extraction openings (20) which are arranged in an axial direction on the opposite side of the motor (18).
  7. Electric hand tool grinder in accordance with one of the preceding claims, characterised in that there is a flow connection between the dust extraction opening (46) and the fan chamber (32) for dust extraction or separation.
  8. Electric hand tool grinder in accordance with one of the preceding claims, characterised in that the fan (24) can be driven by means of the drive shaft (10).
EP20070002153 2006-04-07 2007-02-01 Portable electric grinding machine Active EP1842625B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610016480 DE102006016480A1 (en) 2006-04-07 2006-04-07 Electrical power grinder

Publications (2)

Publication Number Publication Date
EP1842625A1 EP1842625A1 (en) 2007-10-10
EP1842625B1 true EP1842625B1 (en) 2010-05-19

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EP (1) EP1842625B1 (en)
DE (2) DE102006016480A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107984393A (en) * 2017-12-14 2018-05-04 昆山万马五金有限公司 One kind is easy to dust suction noise control formula sander

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1189405B (en) * 1961-08-07 1965-03-18 Lutz Kg Eugen Dust extraction device for hand disc grinders, especially rebate grinders
DE3620136C5 (en) * 1986-06-14 2007-01-11 Robert Bosch Gmbh Motor-driven hand grinder with an eccentric drive
US5392568A (en) * 1993-12-22 1995-02-28 Black & Decker Inc. Random orbit sander having braking member
US5580302A (en) 1994-02-28 1996-12-03 Black & Decker Inc. Random orbit sander having air directing baffle
DE10010106A1 (en) * 2000-03-03 2001-09-13 Kress Elek K Gmbh & Co Eccentric disc grinder
DE10329828B4 (en) * 2003-06-27 2009-06-18 Festool Gmbh Hand tool with cooling device and dust extraction

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EP1842625A1 (en) 2007-10-10
DE102006016480A1 (en) 2007-10-11

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