EP0461112B1 - Eccentric grinding machine - Google Patents

Eccentric grinding machine Download PDF

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Publication number
EP0461112B1
EP0461112B1 EP89912898A EP89912898A EP0461112B1 EP 0461112 B1 EP0461112 B1 EP 0461112B1 EP 89912898 A EP89912898 A EP 89912898A EP 89912898 A EP89912898 A EP 89912898A EP 0461112 B1 EP0461112 B1 EP 0461112B1
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EP
European Patent Office
Prior art keywords
eccentric
gear
rim
housing
ring
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EP89912898A
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German (de)
French (fr)
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EP0461112A1 (en
Inventor
Günther Berger
Karl-Heinz Braunbach
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • 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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement

Definitions

  • the invention is based on an eccentric grinder according to the preamble of claim 1.
  • Such an eccentric grinder is known from DE PS 36 25 655.
  • This fuse is designed in the form of a friction brake. This requires a significant number of individual parts and high assembly costs.
  • the friction brake is prone to failure and sensitive to dust. Therefore, a high level of sealing technology must be carried out.
  • the reliability of the brake decreases with increasing wear of its individual parts, such as springs and brake pads. Considerable effort is required to repair them.
  • the well-known random orbit sander In hard, professional use, the well-known random orbit sander has the following further disadvantages:
  • the teeth of the roller and cage assemblies are subject to high wear due to the effect of grinding dust.
  • the switchable gear for the additional, medium roughness processing stage requires complicated adjusting means. These are prone to failure and not very robust. If the gear stages are not switched carefully, there is a risk of tooth breakage for the teeth of the gear rings.
  • the eccentric grinder according to the invention with the characterizing features of the main claim has the advantage of high grinding performance in the fine grinding mode with a simple, space-saving construction.
  • the roller and cage assemblies are extremely resistant to mechanical wear and the service life of the gears is significantly increased. The damaging turning up of the sanding plate when idling is prevented in a particularly simple manner.
  • a further developed form of the random orbital sander also has - known per se - operating modes coarse and medium grinding, which are realized in a simple, gentle way by changing the different roller rings carried by the grinding plate.
  • FIG. 1 shows a sectional view of an eccentric grinder
  • FIG. 2 shows a grinding plate with a roller ring with a ring-like friction lining
  • FIG. 3 shows a grinding plate with a rolling ring with a bristled friction lining
  • FIG. 4 shows a grinding plate with a toothed ring consisting of a toothed belt with a rim-like carrier collar.
  • the eccentric sander 1 shown in Figure 1 has an eccentric gear housing 2 for a grinding plate drive and a drive housing 3.
  • the eccentric gear housing 2 is provided with a nozzle 4 for connecting a suction device 5 and flanged to the drive housing 3 by means of screws 6.
  • a drive shaft 7 protrudes from the drive housing 3.
  • the intermediate piece 8 is designed as a crank and has a cylindrical recess 9 mounted eccentrically to the drive shaft 7.
  • the eccentricity, ie the distance between the axis of the drive shaft 7 and the axis of the recess 9, is designated by e.
  • two ball bearings 10 are inserted, which receive a support pin 11 for a grinding plate 12.
  • the support pin 11 has a hexagon piece 13 and at its free end a threaded hole into which an Allen screw 14 can be screwed.
  • the hexagon piece 13 and a locking washer 15 secure the support pin 11 against axial displacement in the ball bearings 10.
  • the support plate 11 is connected to the grinding plate 12 via the hexagon socket screw 14.
  • This carries a covering 16, for example with a Velcro fastener, which serves to receive a correspondingly designed sanding sheet 17.
  • a rolling ring 18 designed as an internal ring gear is arranged non-rotatably, concentrically with the drive shaft 7.
  • the grinding plate 12 On its end face facing the housing 2, the grinding plate 12 releasably and non-rotatably carries a roller ring 20 designed as an external friction ring, which is aligned concentrically with the axis of the trunnion 11 and thus eccentrically with the drive shaft 7.
  • a roller ring 20 designed as an external friction ring
  • the eccentric grinder works as follows: A motor, not shown, drives the drive shaft 7. This rotates the intermediate piece 8 and allows the support pin 11 held therein eccentrically and with it the grinding plate 12 to rotate about the axis of the drive shaft 7. Due to the freely rotatable mounting of the trunnion 11 in the ball bearings 10, the grinding plate 12 fastened thereon can also be freely rotated.
  • the grinding plate 12 arranged on the support pin 11 When the grinding plate 12 is lifted from a surface to be machined, it rolls with minimal slip with its rolling ring 20 in the rolling ring 18 arranged in a rotationally fixed manner on the eccentric gear housing 2 and forces an additional rotational movement of the grinding plate 12.
  • a rolling ring 20 of the grinding plate 12 is shown in cooperation with the rolling ring 18.
  • the rolling ring 20 is provided with an elastic, ring-like friction lining 21 with knobs 22.
  • FIG. 3 shows the rolling ring 40 with an elastic friction lining 41, equipped with bristles 42, which bring about increased frictional engagement with the rolling ring 38 fixed to the housing, which, however, is limited by the elastic bending of the bristles 42 and subsequent latching.
  • the roller ring 20, 40 is dimensioned such that even with a slight pressure of the grinding plate 12 on a surface to be machined, for example with the weight of the random orbital sander 1, no forced rolling movement of the roller ring 20 , 40 can take place on the rolling ring 18, 38, but that together with the rolling ring 20, 40 the grinding plate 12 rotates eccentrically without rotating.
  • the friction between the rolling ring 20, 40 and the housing-fixed rolling ring 18, 38 is sufficient to force the grinding plate 12 to rotate in a gear ratio of here about 1:60 in relation to the drive shaft 7.
  • the roller ring 50 is a toothed part 51.
  • This is formed from an annular toothed belt 52.
  • This sits on a rim-shaped carrier collar 53 with at least part of its width.
  • the carrier collar 53 supports the inherently flexible, pliable, ring-like toothed belt 52, which can thereby act as a fixed friction wheel, the teeth 54 of which frictionally contact the rolling ring 48 without tooth engagement.
  • Even an additional use of both the tooth sides and the toothed belt back of the toothed belt 52 as a friction ring on a non-toothed counter surface has proven to be advantageous.
  • a rough grinding step can be implemented using a grinding plate (not shown) with an internal ring gear that meshes with an additional, not shown, housing-fixed external ring gear.
  • a machining step middle grinding can be realized in a known manner. A change between coarse, medium and fine sanding is possible by changing the sanding plate with the corresponding roller rings.
  • the invention can be advantageously used for the finishing step.
  • the rolling ring 20, 40, 50 is part of a turning wheel, so that e.g. a toothed belt is arranged on one side and a friction ring in the form of an elastic ring is arranged on the other side.
  • Gearboxes according to the invention are of suitable design, e.g. through positive power transmission, also for the transmission of higher torques, i.e. suitable for forced rotation of the sanding pad under high pressure on surfaces to be processed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

An eccentric grinding machine (1) has a grinding disk (12) rotatably mounted on a drive shaft (7). Mutually touching rolling rings (18, 20) are mounted on the grinding disk (12) and on the housing (2) of the eccentric drive of the eccentric grinding machine (1) in the form of a planetary gear. The rolling ring (18) on the housing (2) of the eccentric drive is mounted concentrically with the drive shaft (7), and the rolling ring (20, 40, 50) is mounted on the grinding disk (12) eccentrically to the drive shaft (7). This results in a reliable, insensitive construction specially suited to fine grinding work, in which the rolling ring (20, 40, 50) of the grinding disk (12) is frictionally engaged with a rolling ring (18) in the form of an internally toothed ring fastened to the housing, and in which the acceleration of the grinding disk (12) to the no-load speed of the drive shaft (7) is very effectively prevented.

Description

Die Erfindung geht aus von einem Exzenterschleifer nach der Gattung des Anspruchs 1. Ein derartiger Exzenterschleifer ist bekannt durch die DE PS 36 25 655. Dieser hat in der feinsten Bearbeitungsstufe eine Sicherung gegen ein unbeabsichtigtes Hochdrehen des Schleiftellers auf die Leerlaufdrehzahl des Maschinenantriebs. Diese Sicherung ist in Form einer Reibungsbremse ausgestaltet. Dafür ist eine erhebliche Anzahl von Einzelteilen und hoher Montageaufwand nötig. Die Reibungsbremse ist störanfällig und empfindlich gegen Staub. Deshalb muß ein hoher dichtungstechnischer Aufwand betrieben werden. Die Zuverlässigkeit der Bremse nimmt mit zunehmendem Verschleiß ihrer Einzelteile, wie Federn und Bremsbeläge, ab. Für deren Instandsetzung ist ein erheblicher Aufwand erforderlich.The invention is based on an eccentric grinder according to the preamble of claim 1. Such an eccentric grinder is known from DE PS 36 25 655. In the finest processing stage, this has a safeguard against inadvertent turning up of the grinding plate to the idling speed of the machine drive. This fuse is designed in the form of a friction brake. This requires a significant number of individual parts and high assembly costs. The friction brake is prone to failure and sensitive to dust. Therefore, a high level of sealing technology must be carried out. The reliability of the brake decreases with increasing wear of its individual parts, such as springs and brake pads. Considerable effort is required to repair them.

Im harten, professionellen Einsatz hat der bekannte Exzenterschleifer folgende weitere Nachteile: Die Zähne der Wälzkränze sind hohem Verschleiß infolge von Schleifstaubwirkung unterworfen. Das umschaltbare Getriebe für die zusätzliche, eine mittlere Rauheit erzeugende Bearbeitungsstufe erfordert komplizierte Stellmittel. Diese sind störanfällig und wenig robust. Bei unvorsichtigem Umschalten der Getriebestufen besteht für die Zähne der Wälzkränze die Gefahr von Zahnbrüchen.In hard, professional use, the well-known random orbit sander has the following further disadvantages: The teeth of the roller and cage assemblies are subject to high wear due to the effect of grinding dust. The switchable gear for the additional, medium roughness processing stage requires complicated adjusting means. These are prone to failure and not very robust. If the gear stages are not switched carefully, there is a risk of tooth breakage for the teeth of the gear rings.

Vorteile der ErfindungAdvantages of the invention

Der erfindungsgemäße Exzenterschleifer mit den kennzeichnenden Merkmalen des Hauptanspruchs hat für die Betriebsart Feinschliff demgegenüber den Vorteil hoher Schleifleistung bei einfachem, raumsparendem Aufbau. Die Wälzkränze sind äußerst widerstandsfähig gegen mechanischen Verschleiß und die Lebensdauer der Verzahnungen ist wesentlich erhöht. Auf besonders einfache Weise ist das schädliche Hochdrehen des Schleiftellers im Leerlauf verhindert.The eccentric grinder according to the invention with the characterizing features of the main claim has the advantage of high grinding performance in the fine grinding mode with a simple, space-saving construction. The roller and cage assemblies are extremely resistant to mechanical wear and the service life of the gears is significantly increased. The damaging turning up of the sanding plate when idling is prevented in a particularly simple manner.

Eine weiterentwickelte Form des Exzenterschleifers hat zusätzlich -an sich bekannte- Betriebsarten Grob- und Mittelschliff, die auf einfache, schonende Weise durch Wechsel der vom Schleifteller getragenen, unterschiedlichen Wälzkränze realisiert werden.A further developed form of the random orbital sander also has - known per se - operating modes coarse and medium grinding, which are realized in a simple, gentle way by changing the different roller rings carried by the grinding plate.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Schnittdarstellung eines Exzenterchleifers, Figur 2 einen Schleifteller mit Wälzkranz mit ringartigem Reibbelag, Figur 3 einen Schleifteller mit Wälzkranz mit borstenbesetztem Reibbelag und Figur 4 einen Schleifteller mit einem aus einem Zähnriemen mit felgenartigem Trägerbund bestehenden Zahnkranz.Embodiments of the invention are shown in the drawing and explained in more detail in the following description. FIG. 1 shows a sectional view of an eccentric grinder, FIG. 2 shows a grinding plate with a roller ring with a ring-like friction lining, FIG. 3 shows a grinding plate with a rolling ring with a bristled friction lining, and FIG. 4 shows a grinding plate with a toothed ring consisting of a toothed belt with a rim-like carrier collar.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Der in Figur 1 dargestellte Exzenterschleifer 1 hat ein Exzentergetriebegehäuse 2 für einen Schleiftellerantrieb und ein Antriebsgehäuse 3. Das Exzentergetriebegehäuse 2 ist mit einem Stutzen 4 zum Anschluß einer Absaugvorrichtung 5 versehen und an das Antriebsgehäuse 3 mittels Schrauben 6 angeflanscht. Aus dem Antriebsgehäuse 3 ragt eine Antriebswelle 7 heraus. Auf diese ist ein Zwischenstück 8 aufgeschraubt. Das Zwischenstück 8 ist als Kurbel ausgebildet und hat eine exzentrisch zur Antriebswelle 7 gelagerte, zylindrische Ausnehmung 9. Die Exzentrizität, d.h. der Abstand zwischen der Achseder Antriebswelle 7 und der Achse der Ausnehmung 9 ist mit e bezeichnet. In die Ausnehmung 9 sind zwei Kugellager 10 eingesetzt, die einen Tragzapfen 11 für einen Schleifteller 12 aufnehmen. Der Tragzapfen 11 besitzt ein Sechskantstück 13 und an seinem freien Ende eine Gewindebohrung, in die eine Innensechskantschraube 14 eingeschraubt werden kann. Das Sechskantstück 13 und eine Sicherungsscheibe 15 sichern den Tragzapfen 11 gegen axiales Verschieben in den Kugellagern 10. Mit dem Tragzapfen 11 ist über die Innensechskantschraube 14 der Schleifteller 12 verbunden. Dieser trägt einen Belag 16, beispielsweise mit Klettverschluß, der zur Aufnahme eines entsprechend ausgebildeten Schleifblattes 17 dient.The eccentric sander 1 shown in Figure 1 has an eccentric gear housing 2 for a grinding plate drive and a drive housing 3. The eccentric gear housing 2 is provided with a nozzle 4 for connecting a suction device 5 and flanged to the drive housing 3 by means of screws 6. A drive shaft 7 protrudes from the drive housing 3. On this is an intermediate piece 8 screwed on. The intermediate piece 8 is designed as a crank and has a cylindrical recess 9 mounted eccentrically to the drive shaft 7. The eccentricity, ie the distance between the axis of the drive shaft 7 and the axis of the recess 9, is designated by e. In the recess 9, two ball bearings 10 are inserted, which receive a support pin 11 for a grinding plate 12. The support pin 11 has a hexagon piece 13 and at its free end a threaded hole into which an Allen screw 14 can be screwed. The hexagon piece 13 and a locking washer 15 secure the support pin 11 against axial displacement in the ball bearings 10. The support plate 11 is connected to the grinding plate 12 via the hexagon socket screw 14. This carries a covering 16, for example with a Velcro fastener, which serves to receive a correspondingly designed sanding sheet 17.

Am Exzentergetriebegehäuse 2 ist undrehbar, konzentrisch zur Antriebswelle 7 ein als Innenzahnkranz ausgebildeter Wälzkranz 18 angeordnet. An seiner dem Gehäuse 2 zugewandten Stirnfläche trägt der Schleifteller 12 lösbar und drehfest einen als Außenreibkranz ausgebildeten Wälzkranz 20, der konzentrisch zur Achse des Tragzapfens 11 und damit exzentrisch zur Antriebswelle 7 ausgerichtet ist. Zwischen dem Wälzkranz 20 des Schleiftellers 12 und dem Wälzkranz 18 des Exzentergetriebegehäuses 2 besteht eine kraftschlüssige Verbindung zur Übertragung einer Drehbewegung.On the eccentric gear housing 2, a rolling ring 18 designed as an internal ring gear is arranged non-rotatably, concentrically with the drive shaft 7. On its end face facing the housing 2, the grinding plate 12 releasably and non-rotatably carries a roller ring 20 designed as an external friction ring, which is aligned concentrically with the axis of the trunnion 11 and thus eccentrically with the drive shaft 7. Between the rolling ring 20 of the grinding plate 12 and the rolling ring 18 of the eccentric gear housing 2 there is a non-positive connection for transmitting a rotary movement.

Der Exzenterschleifer arbeitet folgendermaßen: Ein nicht dargestellter Motor treibt die Antriebswelle 7 an. Diese dreht das Zwischenstück 8 und läßt den darin exzentrisch gehaltenen Tragzapfen 11 und mit diesem den Schleifteller 12 um die Achse der Antriebswelle 7 kreisen. Durch die in den Kugellagern 10 frei drehbare Lagerung des Tragzapfens 11 ist auch der darauf befestigte Schleifteller 12 frei drehbar. Der auf dem Tragzapfen 11 angeordnete Schleifteller 12 rollt bei von einer zu bearbeitenden Fläche abgehobenem Schleifteller 12 mit minimalem Schlupf mit seinem Wälzkranz 20 im am Exzentergetriebegehäuse 2 drehfest angeordneten Wälzkranz 18 ab und erzwingt eine zusätzliche Rotationsbewegung des Schleiftellers 12.The eccentric grinder works as follows: A motor, not shown, drives the drive shaft 7. This rotates the intermediate piece 8 and allows the support pin 11 held therein eccentrically and with it the grinding plate 12 to rotate about the axis of the drive shaft 7. Due to the freely rotatable mounting of the trunnion 11 in the ball bearings 10, the grinding plate 12 fastened thereon can also be freely rotated. The grinding plate 12 arranged on the support pin 11 When the grinding plate 12 is lifted from a surface to be machined, it rolls with minimal slip with its rolling ring 20 in the rolling ring 18 arranged in a rotationally fixed manner on the eccentric gear housing 2 and forces an additional rotational movement of the grinding plate 12.

Bei auf eine zu bearbeitende Fläche aufgesetztem Schleifteller 12 ist die Reibung zwischen dem Schleifteller und der zu bearbeitenden Fläche so groß, daß sich maximaler Schlupf zwischen dem Wälzkranz 20 und dem Wälzkranz 18 einstellt, so daß der Schleifteller 12 kaum noch oder sogar nicht rotiert. Der Weg jedes einzelnen Schleifkornes pro Exzenterumdrehung, das ebenso wie der Schleifteller 12 Kreise mit dem Radius der Exzentrizität e beschreibt, ist dadurch kleiner als bei einer zusätzlichen, erzwungenen Rotation. Daraus ergibt sich infolge des geringen Abtrages an Schleifgut ein feines Schliffbild.When a grinding disc 12 is placed on a surface to be machined, the friction between the grinding disc and the surface to be machined is so great that maximum slip occurs between the rolling ring 20 and the rolling ring 18, so that the grinding plate 12 hardly or not at all rotates. The path of each individual abrasive grain per eccentric revolution, which, like the grinding plate, describes 12 circles with the radius of the eccentricity e, is therefore smaller than with an additional, forced rotation. This results in a fine grinding pattern due to the low removal of abrasive material.

In Figur 2 ist ein Wälzkranz 20 des Schleiftellers 12 in Zusammenwirken mit dem Wälzkranz 18 gezeigt. Der Wälzkranz 20 ist mit einem elastischen, ringartigen Reibbelag 21 mit Noppen 22 versehen.In Figure 2, a rolling ring 20 of the grinding plate 12 is shown in cooperation with the rolling ring 18. The rolling ring 20 is provided with an elastic, ring-like friction lining 21 with knobs 22.

Die Figur 3 zeigt den Wälzkranz 40 mit einem elastischen Reibbelag 41, bestückt mit Borsten 42, die einen erhöhten Reibschluß zum gehäusefesten Wälzkranz 38 bewirken, der allerdings durch das elastische Umbiegen der Borsten 42 und anschließendes Überrasten begrenzt ist.FIG. 3 shows the rolling ring 40 with an elastic friction lining 41, equipped with bristles 42, which bring about increased frictional engagement with the rolling ring 38 fixed to the housing, which, however, is limited by the elastic bending of the bristles 42 and subsequent latching.

Bei den Ausführungsbeispielen der Figuren 2 und 3 ist ebenso wie bei Figur 1 der Wälzkranz 20, 40 so dimensioniert, daß bereits bei leichtem Andruck des Schleiftellers 12 auf eine zu bearbeitende Fläche, etwa mit dem Eigengewicht des Exzenterschleifers 1, keine erzwungene Abrollbewegung des Wälzkranzes 20, 40 auf dem Wälzkranz 18, 38 erfolgen kann, sondern daß gemeinsam mit dem Wälzkranz 20, 40 der Schleifteller 12 exzentrisch kreist, ohne zu rotieren. Bei Betreiben des Exzenterschleifers 1 ohne Last, z. B. bei von einer Bearbeitungsfläche abgehobenem Schleifteller 12, genügt die Reibung zwischen dem Wälzkranz 20, 40 und dem gehäusefesten Wälzkranz 18, 38 um den Schleifteller 12 zum Rotieren in einem Übersetzungsverhältnis von hier etwa 1 : 60 im Verhältnis zur Antriebswelle 7 zu zwingen. Ein unerwünschtes, rotatorisches Hochdrehen des Schleiftellers 12 auf die Leerlaufdrehzahl der Antriebswelle 7 bzw. des Tragzapfens 11 infolge der Lagerreibung der Kugellager 10 ist somit ausgeschlossen. Anderenfalls würde ein Hochdrehen des Schleiftellers 12 beim Aufsetzen auf das Werkstück solange einen ungewollten Grobschliff bewirken, bis die Rotation des Schleiftellers 12 völlig beendet ist. Schäden an Feinschliffflächen und Reklamationen wären die negative Folge.In the exemplary embodiments in FIGS. 2 and 3, as in FIG. 1, the roller ring 20, 40 is dimensioned such that even with a slight pressure of the grinding plate 12 on a surface to be machined, for example with the weight of the random orbital sander 1, no forced rolling movement of the roller ring 20 , 40 can take place on the rolling ring 18, 38, but that together with the rolling ring 20, 40 the grinding plate 12 rotates eccentrically without rotating. When operating of the random orbit sander 1 without load, e.g. B. from a machining surface lifted grinding plate 12, the friction between the rolling ring 20, 40 and the housing-fixed rolling ring 18, 38 is sufficient to force the grinding plate 12 to rotate in a gear ratio of here about 1:60 in relation to the drive shaft 7. An undesirable, rotational rotation of the grinding plate 12 to the idle speed of the drive shaft 7 or the trunnion 11 due to the bearing friction of the ball bearings 10 is thus excluded. Otherwise, turning up the grinding plate 12 when it was placed on the workpiece would cause an unwanted rough grinding until the rotation of the grinding plate 12 was completely ended. Damage to fine grinding surfaces and complaints would be the negative result.

Bei der in Figur 4 gezeigten Variante ist der Wälzkranz 50 ein Verzahnungsteil 51. Dieses ist aus einem ringartigen Zahnriemen 52 gebildet. Dieser sitzt an einem felgenförmigen Trägerbund 53 mit zumindest einem Teil seiner Breite auf. Der Trägerbund 53 stützt den an sich flexiblen, biegeweichen, ringartigen Zahnriemen 52, der dadurch als festes Reibrad fungieren kann, wobei dessen Zähne 54 den Wälzkranz 48 ohne Zahneingriff reibend berühren. Sogar eine zusätzliche Verwendung sowohl der Zahnungsseiten als auch der Zahnriemenrücken des Zahnriemens 52 als Reibkranz an einer nichtverzahnten Gegenfläche hat sich als vorteilhaft erwiesen.In the variant shown in FIG. 4, the roller ring 50 is a toothed part 51. This is formed from an annular toothed belt 52. This sits on a rim-shaped carrier collar 53 with at least part of its width. The carrier collar 53 supports the inherently flexible, pliable, ring-like toothed belt 52, which can thereby act as a fixed friction wheel, the teeth 54 of which frictionally contact the rolling ring 48 without tooth engagement. Even an additional use of both the tooth sides and the toothed belt back of the toothed belt 52 as a friction ring on a non-toothed counter surface has proven to be advantageous.

Für einen weiterentwickelten Exzenterschleifer ist eine Bearbeitungsstufe Grobschliff unter Verwendung eines nicht dargestellten Schleiftellers mit Innenzahnkranz realisierbar, der mit einem zusätzlichen, nicht dargestellten gehäusefesten Außenzahnkranz kämmt. Mit einem ähnlichen, jedoch die Bewegung umkehrenden Getriebe ist eine Bearbeitungsstufe Mittelschliff in bekannter Weise realisierbar. Ein Wechsel zwischen Grob-, Mittel- und Feinschliff ist durch Wechsel der Schleifteller mit entsprechenden Wälzkränzen möglich.For a further developed eccentric grinder, a rough grinding step can be implemented using a grinding plate (not shown) with an internal ring gear that meshes with an additional, not shown, housing-fixed external ring gear. With a similar gear, but reversing the movement, a machining step middle grinding can be realized in a known manner. A change between coarse, medium and fine sanding is possible by changing the sanding plate with the corresponding roller rings.

Auch hier ist für die Bearbeitungsstufe Feinschliff die Erfindung vorteilhaft anwendbar.Here, too, the invention can be advantageously used for the finishing step.

Eine besonders vorteilhafte Variante ergibt sich für die Erfindung, wenn der Wälzkranz 20, 40, 50 Teil eines Wenderades ist, so daß z.B. auf der einen Seite ein Zahnriemen und auf der anderen Seite ein Reibring in Form eines elastischen Ringes angeordnet ist. Durch Wenden des Wenderades bei demontiertem Schleifteller 12 kann auf einfache Weise zwischen den bekannten Betriebsarten gewechselt werden.A particularly advantageous variant results for the invention if the rolling ring 20, 40, 50 is part of a turning wheel, so that e.g. a toothed belt is arranged on one side and a friction ring in the form of an elastic ring is arranged on the other side. By turning the turning wheel when the grinding plate 12 is removed, it is easy to switch between the known operating modes.

Erfindungsgemäße Getriebe, insbesondere mit aus Zahnriemen gebildeten Zahnrädern, sind bei entsprechender Auslegung, z.B. durch formschlüssige Kraftübertragung, auch für die Übertragung höherer Drehmomente, d.h. für eine erzwungene Rotation des Schleiftellers unter hohem Andruck auf zu bearbeitende Flächen geeignet.Gearboxes according to the invention, in particular with toothed wheels formed from toothed belts, are of suitable design, e.g. through positive power transmission, also for the transmission of higher torques, i.e. suitable for forced rotation of the sanding pad under high pressure on surfaces to be processed.

Claims (8)

  1. Eccentric grinder (1) with an eccentrically circulating grinding disc (12) which supports a gear rim (20, 40, 50) which, in operation without load and rolling on a gear rim (18, 38, 48) fixed to the housing, forces an additional rotary movement on the grinding disc (12), the gear rim (20, 40, 50) of the grinding disc (12) being a friction rim, and there being minimum slippage in operation without load and maximum slippage in operation under load, characterised in that the gear rim (18, 38, 48) fixed to the housing is a toothed rim which is formed by a ring-type toothed belt (52), and in that, due to incomplete engagement of projections (22, 42, 51) of the gear rim (20, 40, 50) in the toothing of the gear rim (18, 38, 48) fixed to the housing, the elastic deformation of said projections gives the grinding disc (12) an overlocking shaking movement under maximum slippage.
  2. Eccentric grinder according to Claim 1, characterised in that the gear rim (20, 40, 50) bears a friction lining (21, 41, 51), in particular in the form of an elastic ring.
  3. Eccentric grinder according to Claim 2, characterised in that the friction lining (21) is provided with elastic knobs (22).
  4. Eccentric grinder according to Claim 2, characterised in that the friction lining (41) is fitted with bristles (42).
  5. Eccentric grinder according to Claim 1, characterised in that the gear rim (20, 40, 50) supported by the grinding disc (12) is a ring-type toothed belt (52) which is held on a rim-type support collar (53).
  6. Eccentric grinder according to Claims 2 and 5, characterised in that the gear rims (18, 38, 48, 20, 40, 50) formed by toothed belts (52) serve as friction rims.
  7. Eccentric grinder according to Claim 6, characterised in that the grinding disc (12) is exchangeable and is provided with different inner or outer gear rims (20, 40, 50), to which matching, rotationally fixed inner or outer gear rims (18, 38, 48) are assigned on the eccentric transmission housing (2).
  8. Eccentric grinder according to Claim 7, characterised in that the gear rims (20, 40, 50) are arranged on both sides on exchangeable reversing wheels.
EP89912898A 1989-03-02 1989-11-17 Eccentric grinding machine Expired - Lifetime EP0461112B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3906549 1989-03-02
DE3906549A DE3906549A1 (en) 1989-03-02 1989-03-02 Eccentric grinder

Publications (2)

Publication Number Publication Date
EP0461112A1 EP0461112A1 (en) 1991-12-18
EP0461112B1 true EP0461112B1 (en) 1993-02-10

Family

ID=6375280

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89912898A Expired - Lifetime EP0461112B1 (en) 1989-03-02 1989-11-17 Eccentric grinding machine

Country Status (6)

Country Link
US (1) US5261190A (en)
EP (1) EP0461112B1 (en)
JP (1) JPH04503775A (en)
BR (1) BR8907881A (en)
DE (2) DE3906549A1 (en)
WO (1) WO1990009869A1 (en)

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Also Published As

Publication number Publication date
JPH04503775A (en) 1992-07-09
DE58903553D1 (en) 1993-03-25
BR8907881A (en) 1991-12-17
US5261190A (en) 1993-11-16
DE3906549C2 (en) 1992-07-30
DE3906549A1 (en) 1990-09-06
WO1990009869A1 (en) 1990-09-07
EP0461112A1 (en) 1991-12-18

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