EP2208576B2 - Oscillation drive - Google Patents

Oscillation drive Download PDF

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Publication number
EP2208576B2
EP2208576B2 EP10004390.0A EP10004390A EP2208576B2 EP 2208576 B2 EP2208576 B2 EP 2208576B2 EP 10004390 A EP10004390 A EP 10004390A EP 2208576 B2 EP2208576 B2 EP 2208576B2
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EP
European Patent Office
Prior art keywords
tool
oscillation drive
longitudinal axis
mounting
contact surface
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EP10004390.0A
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German (de)
French (fr)
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EP2208576B1 (en
EP2208576A2 (en
EP2208576A3 (en
Inventor
Rolf Ziegler
Uwe Früh
Adolf Hecht
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C&E Fein GmbH and Co
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C&E Fein GmbH and Co
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Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
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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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/15—Threaded grip
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/16—Longitudinal screw clamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/29—Rotarily connected, differentially translatable members, e.g., turn-buckle, etc.
    • Y10T403/291—Rotarily connected, differentially translatable members, e.g., turn-buckle, etc. having tool-engaging means or operating handle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2164—Cranks and pedals

Definitions

  • the present invention relates to an oscillation drive with a tool according to the preamble of claim 1.
  • An oscillation drive is to be understood as meaning a drive whose output shaft executes an oscillating rotational movement during operation.
  • a fixed to the output shaft tool can be used in a variety of ways, such as for sawing, cutting or grinding.
  • a first variant the tool is pressed with a clamping element, for example by means of a clamping screw, against a receptacle at the free end of the output shaft, so that a high frictional force between the tool and the recording arises.
  • a clamping element for example by means of a clamping screw
  • Such a connection is referred to as frictional.
  • the receptacle or the tool on a mounting portion which can engage in a correspondingly shaped mounting opening on the other part.
  • the transmission of the torque is achieved here by a form fit between the mounting portion and mounting hole.
  • a positive connection offers over a frictional connection the advantage that even very high torques can be transmitted.
  • the attachment portion widens in a direction parallel to the longitudinal axis and on the contact surface at least in one area.
  • the width of the attachment portion is determined in a plane perpendicular to the longitudinal axis and measured along a circular arc whose center lies on the longitudinal axis.
  • the broadening of the attachment portion in the direction of the contact surface can thus be described such that the width of the Fastening portion in a first plane perpendicular to the longitudinal axis is greater than the width in a parallel plane which is farther away from the abutment surface than the first plane.
  • attachment portion narrows or tapers in at least one region away from the contact surface in one direction.
  • base surface of the fastening section, with which the fastening section rests on the contact surface is larger than the surface of the fastening section facing away from the base surface. If the surfaces mentioned are not flat, the respective surface dimension is to be considered in relation to a plane perpendicular to the longitudinal axis.
  • the attachment portion has a plurality of protrusions protruding radially outward with respect to the longitudinal axis.
  • the oscillation drive according to the invention combines the advantages of a positive connection, namely the possibility of transmitting high torques, with the advantages of a frictional connection, namely that overloads are avoided.
  • the transmission of the torque takes place in principle positive fit by a positive connection between the mounting portion of the output shaft and the mounting opening of the tool.
  • the oscillation drive according to the invention allows a certain axial deflection of the tool with respect to the longitudinal axis of the output shaft. Due to the axial deflection of the tool, the tool moves into a region of the mounting portion, which allows a rotation of the tool by a certain angle of rotation.
  • the fastening means presses the tool back into its form-fitting starting position.
  • the force which opposes the fastening means of the axial displacement of the tool is achieved in that the fastening means has an elastic and / or resilient part or is elastically and / or resiliently received.
  • the fastener elastically and / or resiliently presses against the tool and holds it in positive fit.
  • the tool presses against the force exerted by the fastener, so that in a sense a part of the force acting on the attachment portion against the force Fastener is passed.
  • the axial deflection of the tool increases the force exerted by the fastener force and pushes the tool back into the secure positive fit as soon as the increased load decreases.
  • each projection forms, starting from the contact surface, at least one flank whose base line on the contact surface is essentially straight.
  • a corresponding contact surface should also be formed with a straight base line at the attachment opening of the tool. Then the torque transmission can take place along the entire straight line. This can eliminate punctiform stresses between the fastener and the mounting hole, so that areas with a particularly high heat load can be avoided.
  • the flank to the longitudinal axis forms an angle between 5 ° and 40 °, preferably between 10 ° and 25 °, in particular between 13 ° and 17 °.
  • the angle can be chosen in view of the intended material pairing, e.g. Steel on steel or steel on aluminum.
  • the surface of the flank forms a flat trapezoid.
  • the surface of the flank is designed in such a way, upon rotation of the tool a particularly good sliding of the part of the fastening opening corresponding to this flank is possible. Furthermore, it is advantageous in this embodiment that the sliding of the part of the fastening opening and thus the axial deflection of the tool is approximately proportional to the force acting on the tool in the plane of oscillation. That is, the higher the load on the tool, the further the tool can yield axially.
  • the output shaft on a biased by a spring element tension element on which the fastening means can be fixed.
  • the fastening means for example, a fastening pin, held by the substantially rigid tension member, wherein the tension member is in turn held by means of the spring element resiliently in the oscillation drive.
  • the principle of such a structure is for example from the DE 39 02 874 A1 known.
  • the fastening means on an elastic and / or resilient portion.
  • the tool is held by a member that allows the axial deflection of the tool due to a partially elastic and / or resilient property.
  • a fastening means can for example represent a clamping screw whose screw head has a certain elasticity or is elastically displaceable with respect to the screw shaft.
  • the attachment portion is polygonal in cross-section, preferably formed hexagonal.
  • the projections are symmetrical with respect to a direction radial to the longitudinal axis and each have two flanks, which are connected to each other via a remote from the longitudinal axis, common, curved portion.
  • flanks approach at an angle between 5 ° and 35 °, preferably between 10 ° and 25 °, in particular between 12 ° and 18 °.
  • flanks of the projections are closed in an area near the longitudinal axis by an undercut.
  • the torque transmission does not take place in the innermost region of the projection, which is seen radially from the longitudinal axis, but in its middle, and possibly also in its outer region.
  • Fig. 1a shows an oscillating drive 10 with an output shaft 12 which is driven to oscillate about its longitudinal axis 14 and has a free end 16.
  • a receptacle 18 is arranged, which has a contact surface 20 for engaging a tool 22 (FIG. Fig. 3 ) having.
  • a section of the receptacle 18 is in the Fig. 1b shown enlarged.
  • a fastening portion 24 is arranged, which protrudes outwards in relation to the contact surface 20 in the direction of the longitudinal axis 14 to the outside and for the positive connection with a mounting opening 26 (FIG. Fig. 3 ) of a voltage applied to the contact surface 20 tool 22 is formed.
  • the oscillating drive 10 also has a quick-release device 29 with a tensioning lever 30, by means of which a tension element 31 accommodated in the output shaft 12 can be axially displaced between a working position and a rest position.
  • a tension element 31 accommodated in the output shaft 12 can be axially displaced between a working position and a rest position.
  • On the tension element 31 may be a fastening means 28 approximately in the form of a screw to be fastened, which passes through a fastening opening 26 of a tool 22 placed on the fastening section 24.
  • the tension element 31 In the rest position, the tension element 31 is pushed axially outwardly by the tensioning lever 30, so that in this position the fastening means 28 can be released without the aid of a hand tool in order to change the tool 22.
  • the tension element 31 reaches the working position, in which now the tension element 31 is stretched by the action of a spring element 32, so that the fastening means 28 and thus the tool 22 under the action of the spring member 32 against the contact surface 20 of the recording 18 is biased.
  • the fastening means 28 is here indicated in the form of a pin 34 inserted into the tension element 31 with a head 35.
  • the resilient attachment of the fastener 28 results in that the fastener 28 can also be displaced against the force exerted by the spring element 30, i. away from the contact surface 20, when a correspondingly large force is exerted on the fastening means 28.
  • either the tension element 31 or the attachment means 28 permits axial deflection of the tool 22.
  • the force required to counteract the pretension of the attachment means 28 results from FIG between the output shaft 12 and the tool 22 acting torque, as will be explained in more detail below.
  • the attachment portion 24 here has four projections 36, which are each arranged at an angle of 90 ° to each other about the longitudinal axis 14. (One of the projections 36 is hidden here.) The projections 36 are each connected via a concentric to the longitudinal axis 14 arc-like portion 44. Overall, it should be noted that the attachment portion 24 widens in a direction parallel to the longitudinal axis 14 and on the contact surface 20.
  • the projections 36 are symmetrical with respect to a radial direction to the longitudinal axis 14 and each have two flanks 38, which facing away from the longitudinal axis 14 , common, curved portion 42 are interconnected.
  • the baseline 40 of the flanks 38 on the contact surface 20 is in each case a straight line.
  • the flanks 38 form in a side view approximately according to Fig. 1a, b each a flat harness.
  • the angle ⁇ formed by a flank 38 to the longitudinal axis 14 is here about 15 °.
  • the angle ⁇ at the rounding of the projection 36 is here also about 15 °, but if necessary, it can also be selected differently from the angle ⁇ .
  • the projection 36 tapers in the radial direction from the longitudinal axis 14 to the outside.
  • the taper is achieved by the planar flanks 38 approaching radially outward.
  • the angle ⁇ between the two flat flanks 38 is approximately 15 ° here.
  • flanks 38 of the projections 36 in an area close to the longitudinal axis 14 are each closed by an undercut 46. This can cause the power transmission between the output shaft 12 and the tool 22 takes place mainly or exclusively along the flanks 38.
  • Fig. 3 shows the oscillating drive 10 with attached tool 22.
  • the mounting hole 26 has eight receptacles, the shape and size of the projections 36 is adapted so that the tool 22 - as shown by the dashed line - can be placed in different positions.
  • the oscillation direction of the oscillation drive 10 is indicated by means of the double arrow 48.
  • Fig. 4 shows the receptacle 18 with an attached tool 22, wherein the tool 22 is pressed by the fastening means 28 against the contact surface 20.
  • edges 50 of the attachment opening 26 of the tool 22 in the region of the baseline 40 abut the projection 36. In this way There is a positive transmission of the torque from the output shaft 12 to the tool 22 instead.
  • the force acting on the tool 22 causes it to slide with its attachment opening 26 along the flank 38.
  • the tool 22 pushes against the bias of the fastener 28, while the force component 54 leads to the rotation of the tool 22 by the twist angle ⁇ .
  • the rotation can take place when the axial force component 52 exceeds the bias caused by the spring element.
  • the compliance can be realized advantageously with an oscillating drive 10 with a quick-release device 28, since the existing spring element 32 can be used to achieve the axial mobility.
  • Fig. 6a and 6b show by way of example an alternative embodiment of the receptacle 18 with a mounting portion 24 in the form of a hexagon.

Abstract

The oscillating drive has a shaft whose free end (16) forms a flat mounting (18) for a tool (22). Lugs (36) on the mounting fit though slots on the tool and deform them so that the tool is prevented from rotating with respect to the mounting.

Description

Die vorliegende Erfindung betrifft einen Oszillationsantrieb mit einem Werkzeug gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to an oscillation drive with a tool according to the preamble of claim 1.

Ein solcher Oszillationsantrieb ist aus der US 6,945,862 B2 bekannt.Such an oscillation drive is from the US 6,945,862 B2 known.

Unter einem Oszillationsantrieb soll ein Antrieb verstanden werden, dessen Abtriebswelle im Betrieb eine oszillierende Drehbewegung ausführt. Ein an der Abtriebswelle befestigtes Werkzeug kann so in vielfältiger Weise, etwa zum Sägen, Schneiden oder Schleifen, verwendet werden.An oscillation drive is to be understood as meaning a drive whose output shaft executes an oscillating rotational movement during operation. A fixed to the output shaft tool can be used in a variety of ways, such as for sawing, cutting or grinding.

Grundsätzlich sind zwei Arten bekannt, das Werkzeug mit der Abtriebswelle zu verbinden. Bei einer ersten Variante wird das Werkzeug mit einem Spannelement, beispielsweise mittels einer Spannschraube, gegen eine Aufnahme am freien Ende der Abtriebswelle gepresst, so dass eine hohe Reibungskraft zwischen dem Werkzeug und der Aufnahme entsteht. Eine solche Verbindung wird als reibschlüssig bezeichnet.Basically, two ways are known to connect the tool with the output shaft. In a first variant, the tool is pressed with a clamping element, for example by means of a clamping screw, against a receptacle at the free end of the output shaft, so that a high frictional force between the tool and the recording arises. Such a connection is referred to as frictional.

Bei einer zweiten Variante weist die Aufnahme oder das Werkzeug einen Befestigungsabschnitt auf, der in eine entsprechend geformte Befestigungsöffnung am jeweils anderen Teil eingreifen kann. Die Übertragung des Drehmoments wird hier durch einen Formschluss zwischen Befestigungsabschnitt und Befestigungsöffnung erzielt. Eine formschlüssige Verbindung bietet gegenüber einer reibschlüssigen Verbindung den Vorteil, dass auch sehr hohe Drehmomente übertragen werden können.In a second variant, the receptacle or the tool on a mounting portion which can engage in a correspondingly shaped mounting opening on the other part. The transmission of the torque is achieved here by a form fit between the mounting portion and mounting hole. A positive connection offers over a frictional connection the advantage that even very high torques can be transmitted.

Im Dauerbetrieb von Oszillationsantrieben haben sich jedoch auch gewisse Nachteile bei der Übertragung hoher Drehmomente auf die Werkzeuge gezeigt. So können die Befestigungsöffnungen teilweise aufgeweitet werden. Auch wurde nach längerem Betrieb eine Erwärmung der Werkzeuge durch den Oszillationsantrieb beobachtet.In continuous operation of oscillating drives, however, certain disadvantages have also been shown in the transmission of high torques to the tools. Thus, the mounting holes can be partially expanded. Also, after prolonged operation, heating of the tools by the oscillation drive was observed.

Vor diesem Hintergrund ist es eine Aufgabe der vorliegenden Erfindung, einen verbesserten Oszillationsantrieb aufzuzeigen, der die Nachteile einer formschlüssigen Drehmomentübertragung auf das Werkzeug verringert.Against this background, it is an object of the present invention to provide an improved oscillation drive, which reduces the disadvantages of a positive torque transmission to the tool.

Diese Aufgabe wird erfindungsgemäß mit einem Oszillationsantrieb gemäß Anspruch 1 gelöst.This object is achieved with an oscillatory drive according to claim 1.

Bei der Erfindung verbreitert sich der Befestigungsabschnitt in einer Richtung parallel zur Längsachse und auf die Anlagefläche zu zumindest in einem Bereich.In the invention, the attachment portion widens in a direction parallel to the longitudinal axis and on the contact surface at least in one area.

Die Breite des Befestigungsabschnitts wird in einer zur Längsachse senkrechten Ebene bestimmt und entlang eines Kreisbogens gemessen, dessen Mittelpunkt auf der Längsachse liegt. Die Verbreiterung des Befestigungsabschnitts in Richtung auf die Anlagefläche kann also derart beschrieben werden, dass die Breite des Befestigungsabschnitts in einer ersten Ebene senkrecht zur Längsachse größer ist als die Breite in einer parallelen Ebene, die weiter von der Anlagefläche entfernt ist als die erste Ebene.The width of the attachment portion is determined in a plane perpendicular to the longitudinal axis and measured along a circular arc whose center lies on the longitudinal axis. The broadening of the attachment portion in the direction of the contact surface can thus be described such that the width of the Fastening portion in a first plane perpendicular to the longitudinal axis is greater than the width in a parallel plane which is farther away from the abutment surface than the first plane.

Anders ausgedrückt bedeutet dies, dass sich der Befestigungsabschnitt in einer Richtung von der Anlagefläche weg in zumindest einem Bereich verengt bzw. verjüngt. Dies bedeutet, dass die Grundfläche des Befestigungsabschnitts, mit der der Befestigungsabschnitt auf der Anlagefläche ruht, größer ist als die von der Grundfläche abgewandte Oberfläche des Befestigungsabschnitts. Sofern die genannten Flächen nicht eben ausgebildet sind, ist das jeweilige Flächenmaß in Bezug auf eine zur Längsachse senkrechten Ebene zu betrachten.In other words, this means that the attachment portion narrows or tapers in at least one region away from the contact surface in one direction. This means that the base surface of the fastening section, with which the fastening section rests on the contact surface, is larger than the surface of the fastening section facing away from the base surface. If the surfaces mentioned are not flat, the respective surface dimension is to be considered in relation to a plane perpendicular to the longitudinal axis.

Bei der Erfindung weist der Befestigungsabschnitt eine Mehrzahl von Vorsprüngen auf, die bezogen auf die Längsachse radial nach außen hervorstehen.In the invention, the attachment portion has a plurality of protrusions protruding radially outward with respect to the longitudinal axis.

Mittels solcher Vorsprünge kann der formschlüssige Sitz und die gewünschte Drehmomentübertragung besonders gut realisiert werden.By means of such projections of the positive fit and the desired torque transmission can be realized particularly well.

Damit ist die oben genannte Aufgabe vollständig gelöst.Thus, the above task is completely solved.

Der erfindungsgemäße Oszillationsantrieb verbindet die Vorteile einer formschlüssigen Verbindung, nämlich der Möglichkeit zur Übertragung hoher Drehmomente, mit den Vorteilen eines Reibschlusses, nämlich dass Überlastungen vermieden werden.The oscillation drive according to the invention combines the advantages of a positive connection, namely the possibility of transmitting high torques, with the advantages of a frictional connection, namely that overloads are avoided.

Gemäß der Erfindung erfolgt die Übertragung des Drehmoments grundsätzlich formschlüssig durch einen Formschluss zwischen dem Befestigungsabschnitt der Abtriebswelle und der Befestigungsöffnung des Werkzeugs.According to the invention, the transmission of the torque takes place in principle positive fit by a positive connection between the mounting portion of the output shaft and the mounting opening of the tool.

Wenn nun die Belastung des Oszillationsantriebs zunimmt, so erlaubt der erfindungsgemäße Oszillationsantrieb ein gewisses axiales Ausweichen des Werkzeugs in Bezug auf die Längsachse der Abtriebswelle. Durch das axiale Ausweichen des Werkzeugs bewegt sich das Werkzeug in einen Bereich des Befestigungsabschnitts, der eine Verdrehung des Werkzeugs um einen gewissen Verdrehwinkel erlaubt.Now, if the load of the oscillation drive increases, so the oscillation drive according to the invention allows a certain axial deflection of the tool with respect to the longitudinal axis of the output shaft. Due to the axial deflection of the tool, the tool moves into a region of the mounting portion, which allows a rotation of the tool by a certain angle of rotation.

So ergibt sich bei hoher Belastung eine gewisse Nachgiebigkeit, die eine gewisse Relativbewegung des Werkzeugs gegenüber der Abtriebswelle erlaubt. So werden Drehmomentspitzen reduziert. Dadurch wird gleichzeitig die Gefahr einer Wärmeentwicklung durch die Drehmomentübertragung reduziert und ein Ausschlagen der Befestigungsöffnung vermieden.This results in a high degree of resilience, which allows a certain relative movement of the tool relative to the output shaft. This reduces torque peaks. As a result, the risk of heat generation is simultaneously reduced by the torque transmission and avoiding knocking the mounting hole.

Die neu geschaffene Möglichkeit, dass das Werkzeug axial gegenüber der Anlagefläche nachgeben und sich um einen gewissen Verdrehwinkel verdrehen kann, führt zu einer Aufteilung der in der Oszillationsebene gegen den Befestigungsabschnitt wirkenden Kraft in zwei Komponenten, nämlich in eine axial wirkende Kraftkomponente, aufgrund der das Werkzeug als Reaktion axial gegen das Befestigungsmittel drückt, und in eine verbleibende, in der Oszillationsebene wirkende Kraftkomponente.The newly created possibility that the tool yield axially relative to the contact surface and can rotate by a certain angle of rotation leads to a division of the forces acting in the oscillation plane against the fixing portion force into two components, namely in an axially acting force component, due to the tool axially in response to the fastener, and into a remaining force component acting in the plane of oscillation.

Geht die auf das Werkzeug wirkende Belastung wieder zurück, so drückt das Befestigungsmittel das Werkzeug wieder in seine formschlüssige Ausgangslage zurück. Die Kraft, die das Befestigungsmittel der axialen Verschiebung des Werkzeugs entgegensetzt, wird dadurch erzielt, dass das Befestigungsmittel einen elastischen und/oder federnden Teil aufweist oder elastisch und/oder federnd aufgenommen ist.If the load acting on the tool returns, the fastening means presses the tool back into its form-fitting starting position. The force which opposes the fastening means of the axial displacement of the tool is achieved in that the fastening means has an elastic and / or resilient part or is elastically and / or resiliently received.

Bereits im Ruhezustand presst das Befestigungsmittel elastisch und/oder federnd gegen das Werkzeug und hält es im formschlüssigen Sitz. Bei hoher Belastung drückt das Werkzeug gegen die vom Befestigungsmittel ausgeübte Kraft, so dass gewissermaßen ein Teil der auf den Befestigungsabschnitt wirkenden Kraft gegen das Befestigungsmittel geleitet wird. Durch das axiale Ausweichen des Werkzeugs steigt die vom Befestigungsmittel ausgeübte Kraft an und drückt das Werkzeug zurück in den sicheren formschlüssigen Sitz, sobald die erhöhte Belastung nachlässt.Already at rest, the fastener elastically and / or resiliently presses against the tool and holds it in positive fit. At high load, the tool presses against the force exerted by the fastener, so that in a sense a part of the force acting on the attachment portion against the force Fastener is passed. The axial deflection of the tool increases the force exerted by the fastener force and pushes the tool back into the secure positive fit as soon as the increased load decreases.

Bei der Erfindung bildet jeder Vorsprung ausgehend von der Anlagefläche mindestens eine Flanke aus, deren Grundlinie auf der Anlagefläche eine im Wesentlichen gerade Strecke ist.In the invention, each projection forms, starting from the contact surface, at least one flank whose base line on the contact surface is essentially straight.

Entsprechend sollte auch an der Befestigungsöffnung des Werkzeugs eine entsprechende Anlagefläche mit einer geraden Grundlinie ausgebildet sein. Dann kann die Drehmomentübertragung entlang der gesamten geraden Strecke erfolgen. Dies kann punktförmige Belastungen zwischen dem Befestigungselement und der Befestigungsöffnung eliminieren, so dass Bereiche mit besonders hoher Wärmebelastung vermieden werden können.Accordingly, a corresponding contact surface should also be formed with a straight base line at the attachment opening of the tool. Then the torque transmission can take place along the entire straight line. This can eliminate punctiform stresses between the fastener and the mounting hole, so that areas with a particularly high heat load can be avoided.

Bei der Erfindung bildet die Flanke zur Längsachse einen Winkel zwischen 5° und 40°, vorzugsweise zwischen 10° und 25°, insbesondere zwischen 13° und 17°. Der Winkel kann in Hinblick auf die vorgesehene Materialpaarung gewählt werden, z.B. Stahl an Stahl oder Stahl an Aluminium.In the invention, the flank to the longitudinal axis forms an angle between 5 ° and 40 °, preferably between 10 ° and 25 °, in particular between 13 ° and 17 °. The angle can be chosen in view of the intended material pairing, e.g. Steel on steel or steel on aluminum.

Bei diesem Winkelbereich ist ein guter Ausgleich gewährleistet zwischen einerseits einer sicheren formschlüssigen Übertragung des Drehmoments und andererseits der gewünschten Nachgiebigkeit in Drehrichtung bei starker Belastung.In this angular range, a good balance is ensured between on the one hand a secure form-fitting transmission of torque and on the other hand, the desired compliance in the direction of rotation under heavy load.

In einer weiteren Ausgestaltung der Erfindung bildet die Oberfläche der Flanke ein ebenes Trapez.In a further embodiment of the invention, the surface of the flank forms a flat trapezoid.

Wenn die Oberfläche der Flanke derart ausgeführt ist, ist bei einem Verdrehen des Werkzeugs ein besonders gutes Aufgleiten des mit dieser Flanke korrespondierenden Teils der Befestigungsöffnung möglich. Ferner ist bei dieser Ausführungsform vorteilhaft, dass das Aufgleiten des Teils der Befestigungsöffnung und damit das axiale Ausweichen des Werkzeugs ungefähr proportional zur Kraft ist, die in der Oszillationsebene auf das Werkzeug einwirkt. D.h., je höher die Belastung des Werkzeugs ist, desto weiter kann das Werkzeug axial nachgeben.If the surface of the flank is designed in such a way, upon rotation of the tool a particularly good sliding of the part of the fastening opening corresponding to this flank is possible. Furthermore, it is advantageous in this embodiment that the sliding of the part of the fastening opening and thus the axial deflection of the tool is approximately proportional to the force acting on the tool in the plane of oscillation. That is, the higher the load on the tool, the further the tool can yield axially.

In einer weiteren Ausgestaltung der Erfindung weist die Abtriebswelle ein durch ein Federelement vorgespanntes Zugelement auf, an dem das Befestigungsmittel festlegbar ist.In a further embodiment of the invention, the output shaft on a biased by a spring element tension element on which the fastening means can be fixed.

Bei dieser Ausführungsform wird das Befestigungsmittel, beispielsweise ein Befestigungsstift, von dem im Wesentlichen starren Zugelement gehalten, wobei das Zugelement wiederum mittels des Federelements federnd im Oszillationsantrieb gehalten ist. Das Prinzip eines solchen Aufbaus ist beispielsweise aus der DE 39 02 874 A1 bekannt.In this embodiment, the fastening means, for example, a fastening pin, held by the substantially rigid tension member, wherein the tension member is in turn held by means of the spring element resiliently in the oscillation drive. The principle of such a structure is for example from the DE 39 02 874 A1 known.

In einer weiteren Ausgestaltung der Erfindung weist das Befestigungsmittel einen elastischen und/oder federnden Abschnitt auf.In a further embodiment of the invention, the fastening means on an elastic and / or resilient portion.

Bei dieser Ausführungsform wird das Werkzeug von einem Element gehalten, das aufgrund einer teilweise elastischen und/oder federnden Eigenschaft das axiale Ausweichen des Werkzeugs erlaubt. Ein solches Befestigungsmittel kann beispielsweise eine Spannschraube darstellen, deren Schraubenkopf eine gewisse Elastizität hat oder gegenüber dem Schraubenschaft elastisch verlagerbar ist.In this embodiment, the tool is held by a member that allows the axial deflection of the tool due to a partially elastic and / or resilient property. Such a fastening means can for example represent a clamping screw whose screw head has a certain elasticity or is elastically displaceable with respect to the screw shaft.

In einer weiteren Ausgestaltung der Erfindung ist der Befestigungsabschnitt im Querschnitt mehrkantförmig, vorzugsweise sechskantförmig ausgebildet.In a further embodiment of the invention, the attachment portion is polygonal in cross-section, preferably formed hexagonal.

In einer weiteren Ausgestaltung der Erfindung sind die Vorsprünge bezüglich einer zur Längsachse radialen Richtung symmetrisch ausgebildet und weisen je zwei Flanken auf, die über einen von der Längsachse abgewandten, gemeinsamen, gekrümmten Bereich miteinander verbunden sind.In a further embodiment of the invention, the projections are symmetrical with respect to a direction radial to the longitudinal axis and each have two flanks, which are connected to each other via a remote from the longitudinal axis, common, curved portion.

In einer weiteren Ausgestaltung der Erfindung nähern sich die Flanken in einem Winkel zwischen 5° und 35°, vorzugsweise zwischen 10° und 25°, insbesondere zwischen 12° und 18° an.In a further embodiment of the invention, the flanks approach at an angle between 5 ° and 35 °, preferably between 10 ° and 25 °, in particular between 12 ° and 18 °.

In einer weiteren Ausgestaltung der Erfindung sind die Flanken der Vorsprünge in einem der Längsachse nahen Bereich durch eine Hinterschneidung abgeschlossen.In a further embodiment of the invention, the flanks of the projections are closed in an area near the longitudinal axis by an undercut.

Dadurch kann erreicht werden, dass die Drehmomentübertragung nicht im radial von der Längsachse gesehen innersten Bereich des Vorsprungs stattfindet, sondern in seinem mittleren, gegebenenfalls auch in seinem äußeren Bereich.As a result, it can be achieved that the torque transmission does not take place in the innermost region of the projection, which is seen radially from the longitudinal axis, but in its middle, and possibly also in its outer region.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1a
eine Aufnahme eines Oszillationsantriebs in einer Seitenansicht;
Fig. 1b
eine Vergrößerung der Aufnahme gemäß Fig. 1a;
Fig.2a
die Aufnahme gemäß Fig. 1a, aufweisend vier Vorsprünge, in der Seitenansicht;
Fig. 2b
eine Ausschnittsvergrößerung eines Vorsprungs gemäß Fig. 2a;
Fig. 3
die Aufnahme gemäß Fig. 1a mit einem angelegten Werkzeug;
Fig. 4
einen Schnitt längs der Linie IV-IV durch die Aufnahme gemäß Fig. 1a mit aufgesetztem Werkzeug und eingesetztem Befestigungsmittel;
Fig. 5a
die Aufnahme gemäß Fig. 4, bei der das Werkzeug axial ausgewichen ist und sich um einen gewissen Verdrehwinkel verdreht hat;
Fig. 5b
eine Ausschnittsvergrößerung der Aufnahme gemäß Fig. 5a;
Fig. 6a
eine alternative Ausführungsform der Aufnahme mit einem Befestigungsabschnitt in der Form eines Sechskants in der Seitenansicht; und
Fig. 6b
die Ausführungsform gem. Fig. 6a in der Draufsicht.
Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show it:
Fig. 1a
a recording of a Oszillationsantriebs in a side view;
Fig. 1b
an enlargement of the picture according to Fig. 1a ;
2a
the recording according to Fig. 1a comprising four projections, in side view;
Fig. 2b
an enlarged detail of a projection according to Fig. 2a ;
Fig. 3
the recording according to Fig. 1a with a designed tool;
Fig. 4
a section along the line IV-IV through the inclusion according to Fig. 1a with attached tool and inserted fastener;
Fig. 5a
the recording according to Fig. 4 in which the tool has evaded axially and has rotated by a certain angle of rotation;
Fig. 5b
an enlarged detail of the recording according to Fig. 5a ;
Fig. 6a
an alternative embodiment of the recording with a mounting portion in the form of a hexagon in the side view; and
Fig. 6b
the embodiment acc. Fig. 6a in the plan view.

Fig. 1a zeigt einen Oszillationsantrieb 10 mit einer Abtriebswelle 12, die um ihre Längsachse 14 drehoszillierend antreibbar ist und ein freies Ende 16 aufweist. Am freien Ende 16 ist eine Aufnahme 18 angeordnet, die eine Anlagefläche 20 zur Anlage eines Werkzeugs 22 (Fig. 3) aufweist. Ein Ausschnitt der Aufnahme 18 ist in der Fig. 1b vergrößert dargestellt. Fig. 1a shows an oscillating drive 10 with an output shaft 12 which is driven to oscillate about its longitudinal axis 14 and has a free end 16. At the free end 16, a receptacle 18 is arranged, which has a contact surface 20 for engaging a tool 22 (FIG. Fig. 3 ) having. A section of the receptacle 18 is in the Fig. 1b shown enlarged.

An der Aufnahme 18 ist ein Befestigungsabschnitt 24 angeordnet, der gegenüber der Anlagefläche 20 erhaben in Richtung der Längsachse 14 nach außen hervorsteht und der zur formschlüssigen Verbindung mit einer Befestigungsöffnung 26 (Fig. 3) eines an der Anlagefläche 20 anliegenden Werkzeugs 22 ausgebildet ist.On the receptacle 18, a fastening portion 24 is arranged, which protrudes outwards in relation to the contact surface 20 in the direction of the longitudinal axis 14 to the outside and for the positive connection with a mounting opening 26 (FIG. Fig. 3 ) of a voltage applied to the contact surface 20 tool 22 is formed.

Der Oszillationsantrieb 10 weist ferner eine Schnellspanneinrichtung 29 mit einem Spannhebel 30 auf, durch den ein in der Abtriebswelle 12 aufgenommenes Zugelement 31 zwischen einer Arbeitsstellung und einer Ruhestellung axial verschiebbar ist. An dem Zugelement 31 kann ein Befestigungsmittel 28 etwa in Form einer Schraube befestigt werden, die eine Befestigungsöffnung 26 eines auf den Defestigungsabschnitt 24 aufgesetzten Werkzeugs 22 durchsetzt.The oscillating drive 10 also has a quick-release device 29 with a tensioning lever 30, by means of which a tension element 31 accommodated in the output shaft 12 can be axially displaced between a working position and a rest position. On the tension element 31 may be a fastening means 28 approximately in the form of a screw to be fastened, which passes through a fastening opening 26 of a tool 22 placed on the fastening section 24.

In der Ruhestellung ist das Zugelement 31 durch den Spannhebel 30 axial nach außen geschoben, so dass in dieser Stellung das Befestigungsmittel 28 ohne Zuhilfenahme eines Handwerkzeugs gelöst werden kann, um das Werkzeug 22 zu wechseln. Bei Umlegen des Spannhebels 30 gelangt das Zugelement 31 in die Arbeitsstellung, in der nunmehr das Zugelement 31 durch die Wirkung eines Federelements 32 gespannt ist, so dass das Befestigungsmittel 28 und damit das Werkzeug 22 unter der Wirkung des Federelements 32 gegen die Anlagefläche 20 der Aufnahme 18 vorgespannt wird.In the rest position, the tension element 31 is pushed axially outwardly by the tensioning lever 30, so that in this position the fastening means 28 can be released without the aid of a hand tool in order to change the tool 22. When moving the clamping lever 30, the tension element 31 reaches the working position, in which now the tension element 31 is stretched by the action of a spring element 32, so that the fastening means 28 and thus the tool 22 under the action of the spring member 32 against the contact surface 20 of the recording 18 is biased.

Das Befestigungsmittel 28 ist hier in Form eines in das Zugelement 31 eingesetzten Stifts 34 mit einem Kopf 35 angedeutet.The fastening means 28 is here indicated in the form of a pin 34 inserted into the tension element 31 with a head 35.

Insbesondere dann, wenn der Oszillationsantrieb 10 keine Schnellspanneinrichtung 29 - und somit kein Federelement 32 - aufweist, ist es aber beispielsweise auch denkbar, den Rand des Kopfes 35 nachgiebig auszubilden, so dass eine axiale Auslenkung des Werkzeugs 22 möglich ist und der Kopf 35 des Stifts 34 dann eine Rückstellkraft auf das Werkzeug 22 ausübt.In particular, if the oscillation drive 10 no quick-release device 29 - and thus no spring element 32 - has, but it is also conceivable, for example, the edge of the head 35 resiliently form, so that an axial deflection of the tool 22 is possible and the head 35 of the pin 34 then exerts a restoring force on the tool 22.

Die federnde Befestigung des Befestigungsmittels 28 führt dazu, dass das Befestigungsmittel 28 auch entgegen der von dem Federelement 30 ausgeübten Kraft verlagert werden kann, d.h. von der Anlagefläche 20 weg, wenn auf das Befestigungsmittel 28 eine entsprechend große Kraft ausgeübt wird.The resilient attachment of the fastener 28 results in that the fastener 28 can also be displaced against the force exerted by the spring element 30, i. away from the contact surface 20, when a correspondingly large force is exerted on the fastening means 28.

Dadurch erlaubt entweder das Zugelement 31 oder das Befestigungsmittel 28 ein axiales Ausweichen des Werkzeugs 22. Die Kraft, die erforderlich ist, um entgegen der Vorspannung des Befestigungsmittels 28 zu wirken, ergibt sich aus dem zwischen der Abtriebswelle 12 und dem Werkzeug 22 wirkenden Drehmoment, wie nachfolgend noch näher erläutert wird.As a result, either the tension element 31 or the attachment means 28 permits axial deflection of the tool 22. The force required to counteract the pretension of the attachment means 28 results from FIG between the output shaft 12 and the tool 22 acting torque, as will be explained in more detail below.

Der Befestigungsabschnitt 24 weist hier vier Vorsprünge 36 auf, die jeweils im Winkel von 90° zueinander um die Längsachse 14 angeordnet sind. (Einer der Vorsprünge 36 ist hier verdeckt.) Die Vorsprünge 36 sind dabei jeweils über einen zur Längsachse 14 konzentrischen bogenähnlichen Abschnitt 44 verbunden. Insgesamt ist festzustellen, dass sich der Befestigungsabschnitt 24 in einer Richtung parallel zur Längsachse 14 und auf die Anlagefläche 20 zu verbreitert.The attachment portion 24 here has four projections 36, which are each arranged at an angle of 90 ° to each other about the longitudinal axis 14. (One of the projections 36 is hidden here.) The projections 36 are each connected via a concentric to the longitudinal axis 14 arc-like portion 44. Overall, it should be noted that the attachment portion 24 widens in a direction parallel to the longitudinal axis 14 and on the contact surface 20.

Wie in der Zusammenschau mit den Fig. 2a und 2b, die die Aufnahme 18 in einer Draufsicht und eine vergrößerte Ansicht eines Vorsprungs 34 zeigen, zu erkennen ist, sind die Vorsprünge 36 bezüglich einer zur Längsachse 14 radialen Richtung symmetrisch ausgebildet und weisen je zwei Flanken 38 auf, die über einen von der Längsachse 14 abgewandten, gemeinsamen, gekrümmten Bereich 42 miteinander verbunden sind. Die Grundlinie 40 der Flanken 38 auf der Anlagefläche 20 ist jeweils eine gerade Strecke.As in the synopsis with the Fig. 2a and 2b , which show the receptacle 18 in a plan view and an enlarged view of a projection 34, the projections 36 are symmetrical with respect to a radial direction to the longitudinal axis 14 and each have two flanks 38, which facing away from the longitudinal axis 14 , common, curved portion 42 are interconnected. The baseline 40 of the flanks 38 on the contact surface 20 is in each case a straight line.

Die Flanken 38 bilden in einer Seitenansicht etwa gemäß Fig. 1a, b jeweils ein ebenes Trapez. Der von einer Flanke 38 zur Längsachse 14 gebildete Winkel α beträgt hier ungefähr 15°. Der Winkel β an der Rundung des Vorsprungs 36 beträgt hier auch ungefähr 15°, kann bei Bedarf aber auch verschieden vom Winkel α gewählt werden.The flanks 38 form in a side view approximately according to Fig. 1a, b each a flat harness. The angle α formed by a flank 38 to the longitudinal axis 14 is here about 15 °. The angle β at the rounding of the projection 36 is here also about 15 °, but if necessary, it can also be selected differently from the angle α.

Wie in der Fig. 2b besonders gut zu erkennen ist, verjüngt sich der Vorsprung 36 in radialer Richtung von der Längsachse 14 nach außen hin. Die Verjüngung wird dadurch erzielt, dass sich die ebenen Flanken 38 radial nach außen annähern. Der Winkel γ zwischen den beiden ebenen Flanken 38 beträgt hier ungefähr 15°.Like in the Fig. 2b can be seen particularly well, the projection 36 tapers in the radial direction from the longitudinal axis 14 to the outside. The taper is achieved by the planar flanks 38 approaching radially outward. The angle γ between the two flat flanks 38 is approximately 15 ° here.

Zusätzlich zu der genannten Verjüngung sind die Flanken 38 der Vorsprünge 36 in einem der Längsachse 14 nahen Bereich jeweils durch eine Hinterschneidung 46 abgeschlossen. Dies kann bewirken, dass die Kraftübertragung zwischen der Abtriebswelle 12 und dem Werkzeug 22 hauptsächlich oder ausschließlich entlang der Flanken 38 erfolgt.In addition to the said taper, the flanks 38 of the projections 36 in an area close to the longitudinal axis 14 are each closed by an undercut 46. This can cause the power transmission between the output shaft 12 and the tool 22 takes place mainly or exclusively along the flanks 38.

Fig. 3 zeigt den Oszillationsantrieb 10 mit aufgesetztem Werkzeug 22. Die Befestigungsöffnung 26 weist acht Aufnehmungen auf, deren Form und Größe den Vorsprüngen 36 angepasst ist, so dass das Werkzeug 22 - wie mittels der gestrichelten Linie dargestellt - in verschiedenen Positionen aufgesetzt werden kann. Die Oszillationsrichtung des Oszillationsantriebs 10 ist mittels des Doppelpfeils 48 angedeutet. Fig. 3 shows the oscillating drive 10 with attached tool 22. The mounting hole 26 has eight receptacles, the shape and size of the projections 36 is adapted so that the tool 22 - as shown by the dashed line - can be placed in different positions. The oscillation direction of the oscillation drive 10 is indicated by means of the double arrow 48.

Wenn das Werkzeug 22 an der Anlagefläche 20 anliegt, so entsteht ein Formschluss zwischen dem Befestigungsabschnitt 24 und der Befestigungsöffnung 26. Ein möglicher Verdrehwinkel δ ist symbolisch dargestellt. Es sei angemerkt, dass der hier dargestellte Verdrehwinkel δ zum Zwecke der Erläuterung stark übertrieben dargestellt ist und dass der tatsächlich auftretende Verdrehwinkel δ deutlich geringer ist, insbesondere in der Größenordnung von weniger als 1° liegt. Der maximale theoretisch mögliche Verdrehwinkel δ ist durch die Konstruktion der Schnellspanneinrichtung 29 bzw. des Befestigungsmittels 28 begrenzt, da in einer Endlage wieder ein Formschluss erreicht wird. In der Praxis ergeben sich jedoch in Folge der Oszillationen mit hoher Frequenz (∼ 5000 - 30.000 Oszillationen pro Minute) und kleinem Verschwenkwinkel (0,5° - 7°) nur sehr geringe Verdrehwinkel δ.When the tool 22 bears against the abutment surface 20, a positive connection is created between the attachment section 24 and the attachment opening 26. A possible angle of rotation δ is shown symbolically. It should be noted that the twist angle δ shown here is greatly exaggerated for the purpose of explanation and that the actually occurring twist angle δ is significantly smaller, in particular of the order of less than 1 °. The maximum theoretically possible angle of rotation δ is limited by the design of the quick-action clamping device 29 or of the fastening means 28, since in a final position, a positive connection is again achieved. In practice, however, due to the oscillations with high frequency (~ 5000 - 30,000 oscillations per minute) and small pivoting angle (0.5 ° - 7 °) only very small angle of rotation δ.

Fig. 4 zeigt die Aufnahme 18 mit einem aufgesetzten Werkzeug 22, wobei das Werkzeug 22 von dem Befestigungsmittel 28 gegen die Anlagefläche 20 gedrückt wird. Fig. 4 shows the receptacle 18 with an attached tool 22, wherein the tool 22 is pressed by the fastening means 28 against the contact surface 20.

Es ist zu erkennen, dass Kanten 50 der Befestigungsöffnung 26 des Werkzeugs 22 im Bereich der Grundlinie 40 am Vorsprung 36 anliegen. Auf diese Weise findet eine formschlüssige Übertragung des Drehmoments von der Abtriebswelle 12 auf das Werkzeug 22 statt.It can be seen that edges 50 of the attachment opening 26 of the tool 22 in the region of the baseline 40 abut the projection 36. In this way There is a positive transmission of the torque from the output shaft 12 to the tool 22 instead.

Die Situation, die sich einstellt, wenn das Werkzeug 22 einer hohen Belastung ausgesetzt ist, ist in den Fig. 5a und 5b dargestellt, die die Aufnahme 18 und einen vergrößerten Ausschnitt der Aufnahme 18 zeigen.The situation that arises when the tool 22 is subjected to a high load is in the Fig. 5a and 5b shown, the receptacle 18 and an enlarged section of the receptacle 18 show.

Es ist zu erkennen, dass sich das Werkzeug 22 in axialer Richtung von der Anlagefläche 20 abgehoben hat. Auch hier ist die axiale Verschiebung zum Zwecke der besseren Erkennbarkeit stark übertrieben dargestellt. Die schräge Flanke 38 führt dazu, dass die bislang in einer zur Längsachse 14 senkrechten Ebene auf den Befestigungsabschnitt 24, insbesondere auf die Vorsprünge 36, wirkende Kraft nun teilweise in eine axial zur Längsachse 14 wirkende Kraft umgesetzt wird. Diese axial wirkende Kraft ist durch den Pfeil 52 angedeutet. Die verbleibende, quer zur Längsachse 14 wirkende Kraftkomponente ist durch den Pfeil 54 dargestellt.It can be seen that the tool 22 has lifted off the contact surface 20 in the axial direction. Again, the axial displacement for the purpose of better visibility is greatly exaggerated. The oblique flank 38 results in that the force which has hitherto been acting in a plane perpendicular to the longitudinal axis 14 on the fastening section 24, in particular on the projections 36, is now partially converted into a force acting axially to the longitudinal axis 14. This axially acting force is indicated by the arrow 52. The remaining, acting transversely to the longitudinal axis 14 force component is shown by the arrow 54.

Die auf das Werkzeug 22 wirkende Kraft bewirkt, dass es mit seiner Befestigungsöffnung 26 entlang der Flanke 38 aufgleitet. In Reaktion auf die axiale Kraftkomponente 52 drückt das Werkzeug 22 gegen die Vorspannung des Befestigungsmittels 28, während die Kraftkomponente 54 zur Verdrehung des Werkzeugs 22 um den Verdrehwinkel δ führt. Die Verdrehung kann stattfinden, wenn die axiale Kraftkomponente 52 die von dem Federelement bewirkte Vorspannung überschreitet.The force acting on the tool 22 causes it to slide with its attachment opening 26 along the flank 38. In response to the axial force component 52, the tool 22 pushes against the bias of the fastener 28, while the force component 54 leads to the rotation of the tool 22 by the twist angle δ. The rotation can take place when the axial force component 52 exceeds the bias caused by the spring element.

Wenn die Belastung des Werkzeugs 22 wieder nachlässt bzw. die Oszillation in die andere Richtung geht, verringert sich die axiale Kraftkomponente 52 wieder, und das Befestigungsmittel 28 drückt das Werkzeug 22 wieder gegen die Anlagefläche 20.When the load of the tool 22 decreases again or the oscillation goes in the other direction, the axial force component 52 decreases again, and the fastening means 28 again presses the tool 22 against the contact surface 20.

Durch die gewisse Nachgiebigkeit des Werkzeugs 22 bei hohem Drehmoment werden Drehmomentspitzen, die durch die oszillierende Bewegung auftreten, abgebaut und so einer Erwärmung des Werkzeugs 22 und einem Ausschlagen des Befestigungsöffnung 26 entgegen gewirkt.Due to the certain flexibility of the tool 22 at high torque torque peaks that occur due to the oscillating movement, degraded and thus counteracted heating of the tool 22 and a deflection of the mounting hole 26.

Die Nachgiebigkeit kann gerade bei einem Oszillationsantrieb 10 mit einer Schnellspanneinrichtung 28 vorteilhaft realisiert werden, da das vorhandene Federelement 32 genutzt werden kann, die axiale Beweglichkeit zu erzielen.The compliance can be realized advantageously with an oscillating drive 10 with a quick-release device 28, since the existing spring element 32 can be used to achieve the axial mobility.

Fig. 6a und 6b zeigen beispielhaft eine alternative Ausführungsform der Aufnahme 18 mit einem Befestigungsabschnitt 24 in der Form eines Sechskants. Es können auch andere unregelmäßige oder regelmäßige Vielecke, insbesondere Vierecke oder Fünfecke, gewählt werden. Fig. 6a and 6b show by way of example an alternative embodiment of the receptacle 18 with a mounting portion 24 in the form of a hexagon. Other irregular or regular polygons, in particular quadrilaterals or pentagons, may also be chosen.

Claims (19)

  1. Oscillation drive (10) with a tool (22), wherein the oscillation drive comprises:
    - an output shaft (12), which can be driven rotatingly and oscillatingly about its longitudinal axis (14) and which comprises a free end (16),
    - a flat mounting (18) at this free end (16) of the output shaft (12), which comprises a contact surface (20) for attachment of a tool (22),
    - a mounting section (24) at this flat mounting (18), which projects outwards relative to the contact surface (20) in the direction of the longitudinal axis (14) and comprises a plurality of lugs, which project radially outwards with respect to the longitudinal axis, and which are designed to connect by form-fit with a mounting opening (26) of the tool (22) which rests against the contact surface (20),
    - with a holding fixture (28) for fastening the tool (22) with its mounting opening (26) at the flat mounting (18),
    - wherein each lug (36) starting from the contact surface (20) forms at least one flank (38), the baseline (40) of which is a substantially straight line, and
    whereby the tool comprises:
    - a mounting opening (26) which is designed such that a form-fit connection between the mounting section (24) and the mounting opening (26) exists when the tool (22) rests against the contact surface (20),
    characterized in that
    the mounting section (24) tapers in a direction away from the contact surface in at least one area; and
    the flank(38) forms an angle α between 5° and 40°, preferably between 10° and 25°, particularly between 13° and 17°, to the longitudinal axis (14).
  2. Oscillation drive (10) with a tool (22) according to claim 1,
    characterized in that
    a contact surface is designed with a straight baseline at the mounting opening (26) of the tool.
  3. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the mounting opening (26) comprises edges (50) which rest against a lug (36) in the region of a baseline (40), when the tool (22) rests against the contact surface (20).
  4. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the tool (22) counteracts the force exerted by the holding fixture (28) such that a part of the force acting on the mounting section (24) is directed against the holding fixture (28).
  5. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the mounting opening (26) of a tool (22) attached to the mounting section (24) is penetrated by the holding fixture (28).
  6. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the mounting opening comprises recesses adapted in shape and size to suit the lugs such that the tool (22) can be attached in different positions.
  7. Oscillation drive (10) with a tool (22) according to claim 6,
    characterized in that
    the recesses approach each other with an angle between 5° and 35°, preferably between 10° and 25° and particularly between 12° and 18°.
  8. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the tool (22) is held at the mounting section (24) with axial resilience due to the effect of a torque against a preload.
  9. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the tool, by deflecting axially at the mounting section (24), rotates by a certain angle of rotation (δ).
  10. Oscillation drive (10) with a tool (22) according to claim 9,
    characterized in that
    the angle of rotation (δ) is of a magnitude less than 1°.
  11. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the mounting opening (26) of the tool is designed such that it can be accommodated by a form-fit connection to a mounting section (24) which comprises four lugs (36) which each are arranged at an angle of 90° relative to each other around the longitudinal axis (14).
  12. Oscillation drive (10) with a tool (22) according to any one of the preceding claims,
    characterized in that
    the lugs (36) are each connected via an arc-shaped section (44) concentric to the longitudinal axis (14).
  13. Oscillation drive (10) with a tool (22) according to any one of claims 11 to 12,
    characterized in that
    the surface of the flank (38) forms a planar trapezoid.
  14. Oscillation drive (10) with a tool (22) according to any one of the previous claims,
    characterized in that
    the holding fixture (28) for attaching the tool is elastically and/or resiliently held.
  15. Oscillation drive (10) with a tool (22) according to any one of the previous claims,
    characterized in that
    the lugs (36) are formed symmetrically with respect to a direction radial to the longitudinal axis (14) and comprise two flanks (38) each, which are interconnected by a common curved area (42) facing away from the longitudinal axis (14).
  16. Oscillation drive (10) with a tool (22) according to any one of the previous claims,
    characterized in that
    the tool is designed as a saw tool.
  17. Oscillation drive (10) with a tool (22) according to any one of claims 1 to 15,
    characterized in that
    the tool is designed as a cutting tool.
  18. Oscillation drive (10) with a tool (22) according to any one of claims 1 to 15,
    characterized in that
    the tool is designed as a grinding tool.
  19. Oscillation drive (10) with a tool (22) according to any one of the previous claims,
    characterized in that
    the mounting opening (26) of the tool (22) comprises eight recesses.
EP10004390.0A 2006-05-04 2007-04-23 Oscillation drive Active EP2208576B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021969A DE102006021969A1 (en) 2006-05-04 2006-05-04 oscillatory
EP07008184A EP1852218B1 (en) 2006-05-04 2007-04-23 Oscillation drive

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP07008184A Division EP1852218B1 (en) 2006-05-04 2007-04-23 Oscillation drive
EP07008184.9 Division 2007-04-23

Publications (4)

Publication Number Publication Date
EP2208576A2 EP2208576A2 (en) 2010-07-21
EP2208576A3 EP2208576A3 (en) 2010-12-29
EP2208576B1 EP2208576B1 (en) 2013-06-19
EP2208576B2 true EP2208576B2 (en) 2017-08-16

Family

ID=38043034

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07008184A Active EP1852218B1 (en) 2006-05-04 2007-04-23 Oscillation drive
EP10004390.0A Active EP2208576B2 (en) 2006-05-04 2007-04-23 Oscillation drive

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP07008184A Active EP1852218B1 (en) 2006-05-04 2007-04-23 Oscillation drive

Country Status (8)

Country Link
US (1) US7997586B2 (en)
EP (2) EP1852218B1 (en)
CN (1) CN100534708C (en)
AT (1) ATE469728T1 (en)
DE (4) DE102006021969A1 (en)
DK (1) DK1852218T3 (en)
ES (1) ES2346152T3 (en)
PL (1) PL1852218T3 (en)

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Also Published As

Publication number Publication date
EP1852218A1 (en) 2007-11-07
DE202007018679U1 (en) 2009-01-22
EP2208576B1 (en) 2013-06-19
DK1852218T3 (en) 2010-10-04
EP2208576A2 (en) 2010-07-21
DE502007003988D1 (en) 2010-07-15
EP2208576A3 (en) 2010-12-29
CN101066577A (en) 2007-11-07
US20070295156A1 (en) 2007-12-27
PL1852218T3 (en) 2010-12-31
US7997586B2 (en) 2011-08-16
ATE469728T1 (en) 2010-06-15
ES2346152T3 (en) 2010-10-11
EP1852218B1 (en) 2010-06-02
CN100534708C (en) 2009-09-02
DE202007019145U1 (en) 2010-09-30
DE102006021969A1 (en) 2007-11-08

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