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EP2977145B1 - Centrical tensioning device - Google Patents

Centrical tensioning device Download PDF

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Publication number
EP2977145B1
EP2977145B1 EP15174952.0A EP15174952A EP2977145B1 EP 2977145 B1 EP2977145 B1 EP 2977145B1 EP 15174952 A EP15174952 A EP 15174952A EP 2977145 B1 EP2977145 B1 EP 2977145B1
Authority
EP
European Patent Office
Prior art keywords
centrical
clamping device
bearing
base body
bearing block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15174952.0A
Other languages
German (de)
French (fr)
Other versions
EP2977145A1 (en
EP2977145B2 (en
Inventor
Marcel Schlüssel
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Gressel AG
Original Assignee
Gressel AG
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Publication date
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Publication of EP2977145A1 publication Critical patent/EP2977145A1/en
Publication of EP2977145B1 publication Critical patent/EP2977145B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/103—Arrangements for positively actuating jaws using screws with one screw perpendicular to the jaw faces, e.g. a differential or telescopic screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2489—Slideways
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2484—Supports

Definitions

  • the invention relates to a centric clamping device according to the preamble of patent claim 1.
  • Centric tensioners usually have a e.g. On a machine table aufspannbaren body, two on the body via longitudinal guides slidably guided clamping jaws and an adjusting spindle for the opposite adjustment of the two jaws on. With the help of the adjusting spindle, the jaws displaceably arranged on the base body can be moved apart and together at the same time, whereby a centric clamping of workpieces is made possible.
  • a generic centric clamping device known. This has a base body, two slidably guided on the base body clamping jaws and rotatably mounted on the base body by means of a spindle bearing adjusting spindle for the opposite adjustment of the two jaws.
  • the spindle bearing is in this known clamping device of a fastened by screws on the main body bearing piece, which contains a cup-shaped bearing web for engagement in an annular groove of the adjusting spindle.
  • U1 discloses a clamping device with a base body and two clamping jaws, which are arranged opposite to each other on the base body and guided along a common axis towards and away from each other adjustable.
  • the DE 10 2013 104 467 A1 discloses a Zentrischspanner in which two mutually adjustable clamping jaws are guided displaceably on a base body.
  • the clamping jaws are adjustable via a rotatably mounted in a central bearing block threaded spindle.
  • the DE 297 23 435 U1 discloses a centric clamping device with two linearly guided against each other movable clamping slide.
  • the adjustment of the clamping carriage is effected by a rotatably mounted within a bearing block threaded spindle having opposite threaded portions at both ends for engagement in threaded nuts of two pistons.
  • a clamping device with a fixedly arranged on a main body first jaw and an adjustable guided on the base second jaw known.
  • the second clamping jaw is adjustable by means of a arranged in a spindle recess of the main body screw.
  • the spindle recess of the base body is covered by a cover element between the two clamping jaws over the entire adjustment range of the clamping jaws.
  • the DE 10 2007 027 808 B3 relates to a clamping device in which the carriers of the clamping jaws are designed as shells enclosing the adjusting spindle.
  • the object of the invention is to provide a centric clamping device of the type mentioned, which contains an optimally protected against contamination spindle bearing with high accuracy.
  • the spindle bearing is housed in a bearing block and has two bearing sleeves axially adjustable within the bearing block. Due to the axial adjustment of the two bearing sleeves not only axial position of the adjusting spindle can be adjusted with respect to the body, via a mutual adjustment of the two bearing sleeves, the spindle bearing can also be biased and adjusted without play. This achieves high precision and good repeatability.
  • the adjusting spindle is completely covered and sealed over the bearing block in the storage area. The centric clamping device is therefore insensitive to chips and the adjusting spindle is protected against contamination in a closed system.
  • the spindle bearing can be designed as a roller bearing with a plurality of rolling elements guided between the bearing sleeves and the adjusting spindle.
  • the adjusting spindle can be used for this purpose, e.g. two spaced-apart annular grooves for internally supporting the e.g. Having trained as balls Wälzköper.
  • the two bearing sleeves may each contain a shoulder-shaped bearing surface for the outside bearing of the Wälzköper at the facing end faces. By mutual clamping of the two bearing sleeves, the shoulder-shaped bearing surfaces can be brought to bear against the balls and thus a possible backlash-free adjustment can be achieved.
  • the spindle bearing could also be designed as a plain bearing with axially adjustable plain bearing sleeves.
  • a simple axial adjustment of the bearing sleeves can be achieved in that the two bearing sleeves each have an external thread for engagement in a corresponding internal thread extending through the bearing block passage opening.
  • the bearing block closed over the entire circumference can be formed integrally with the base body.
  • An optimized chip discharge can be achieved in that passages extending from the recesses between the bearing block and two side cheeks of the main body are arranged to the outside with inclined bottom surfaces.
  • the two clamping jaws can be adjusted via slides displaceably guided in the base body.
  • the slides can be installed in the body so that there is a protected against dirt and insensitive to chips construction.
  • the adjusting spindle expediently has two external threads designed as right-handed or left-handed threads for engagement with corresponding internal threads on through-holes of the two slides.
  • the jaws are preferably releasably secured to the slides. As a result, the jaws can be replaced if necessary and adapted to the respective clamping task.
  • the jaws can have any shape.
  • the in the FIGS. 1 to 4 shown in different views centric clamping device includes a base body 1, on which two clamping jaws 2 and 3 slidably guided via slides 4 and 5 and are adjustable in opposite directions by an adjusting mechanism with an adjusting spindle 6.
  • the base body 1 has two spaced side cheeks 7 and 8 with upper guide surfaces 9 and 10.
  • the two guide surfaces 9 and 10 are executed on a hardened and ground upper part of the two side cheeks 7 and 8 of the main body 1.
  • the guide surfaces 9 and 10 can also be arranged on separate and replaceable if necessary guide rails or guide rails.
  • the two slides 4 and 5 are fitted and guided displaceably.
  • the slides 4 and 5 have a stepped cross-section with an upper bearing surface 11.
  • FIG. 4 It can be seen, in the upper bearing surface 11 of the two slides 4 and 5 each seen in the longitudinal direction of the body 1 successive recesses 12 and 13 for the positive engagement of a bottom of the jaws 2 and 3 downwardly projecting projection 14 is arranged. This allows the jaws 2 and 3 offset inwards or outwards and through in FIG. 3 recognizable screws 15 are fixed to the respective slide 4 and 5 positionally accurate.
  • the clamping jaws 2 and 3 can have any shape adapted to the respective clamping task. In the embodiment shown, the clamping jaws 2 and 3 are designed as turning jaws with different clamping surfaces. By turning the jaws 2 and 3 so the clamping range can be easily extended or changed.
  • an upwardly and to the side closed bearing block 16 for supporting the adjusting spindle 6 is arranged between the two side cheeks 7 and 8.
  • the two slides 4 and 5 have at the mutually facing end faces a recess 17 or a cover for receiving the bearing block 16 and for covering the adjusting spindle 6.
  • the two slides 4 and 5 can be pushed together to cover the adjusting spindle 6 above the bearing block 16.
  • the adjusting spindle 6 is covered and the chips are deflected.
  • the adjusting spindle 6 is rotatable about its longitudinal axis and secured in the axial direction by a spindle bearing 18 which will be explained in more detail below.
  • the adjusting spindle 6 mounted centrally within the bearing block 16 has a relative to the base body 1 and the slider 5 outwardly projecting and here provided with an external hexagonal adjusting pin 19 and two designed as right- or left-hand thread 20 and 21 for engagement with corresponding internal threads 22 and 23 at through holes 24 and 25 of the two slides 4 and 5 contains.
  • the two slides 4 and 5 can be displaced in opposite directions and the clamping jaws 2 and 3 can thus be moved together or apart at the same time.
  • annular sealing elements 26 the two slides 4 and 5 are sealed at their mutually facing end faces relative to the adjusting spindle 6.
  • the in FIG. 5 bearing block 16 shown in detail is embodied in one piece with the main body 1 in the embodiment shown and contains a passage opening 27 extending in the longitudinal direction of the main body 1, in which the spindle bearing 18 is accommodated for the adjusting spindle 6.
  • the spindle bearing 18 comprises two axially adjustable within the passage opening 27 arranged bearing sleeves 28 and 29, in which the adjusting spindle 6 is rotatably mounted.
  • the adjusting spindle 6 includes a central annular collar 30 and two provided on the right and left of the annular collar 30 annular grooves 31 and 32, in which over the circumference of the adjusting spindle 6 distributed rolling elements 33 are mounted.
  • the two bearing sleeves 28 and 29 each have an external thread 34 for engagement in a corresponding internal thread 35 of the through hole 27 and contain at the facing end faces each have a shoulder-shaped bearing surface 36 on which the inside guided in the two annular grooves 31 and 32 and here as Balls trained rolling elements 33 outside to the plant reach.
  • FIGS. 7 and 8 the arranged between the two side walls of the base body 1 central bearing block 16 is shown in a cross section.
  • recesses 37 are provided with counterbores 38 for attachment of the base body 1 on a machine table or the like.
  • outwardly leading passages 39 are arranged with sloping bottom surfaces 40.
  • the two clamping jaws 2 and 3 are formed as turning jaws and have on one side straight and on the other side stepped clamping surfaces. By turning the jaws 2 and 3 so the clamping area on easy way to be extended. But the jaws 2 and 3 can also have any other, adapted to the respective clamping task, shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Machine Tool Units (AREA)
  • Clamps And Clips (AREA)

Description

Die Erfindung betrifft eine Zentrisch-Spannvorrichtung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a centric clamping device according to the preamble of patent claim 1.

Zentrisch-Spannvorrichtungen weisen üblicherweise einen z.B. auf einem Maschinentisch aufspannbaren Grundkörper, zwei an dem Grundkörper über Längsführungen verschiebbar geführte Spannbacken und eine Verstellspindel zur gegenläufigen Verstellung der beiden Spannbacken auf. Mit Hilfe der Verstellspindel können die am Grundkörper verschiebbar angeordneten Spannbacken gleichzeitig auseinander- und zusammengefahren werden, wodurch eine zentrische Spannung von Werkstücken ermöglicht wird.Centric tensioners usually have a e.g. On a machine table aufspannbaren body, two on the body via longitudinal guides slidably guided clamping jaws and an adjusting spindle for the opposite adjustment of the two jaws on. With the help of the adjusting spindle, the jaws displaceably arranged on the base body can be moved apart and together at the same time, whereby a centric clamping of workpieces is made possible.

Aus der DE 10 2012 112 755 A1 ist eine gattungsgemäße Zentrisch-Spannvorrichtung bekannt. Diese weist einen Grundkörper, zwei am Grundkörper verschiebbar geführte Spannbacken und eine mittels einer Spindellagerung drehbar am Grundkörper gelagerte Verstellspindel zur gegenläufigen Verstellung der beiden Spannbacken auf. Die Spindelllagerung besteht bei dieser bekannten Spannvorrichtung aus einem mittels Schrauben am Grundkörper befestigten Lagerstück, das einen schalenförmigen Lagersteg zum Eingriff in eine Ringnut der Verstellspindel enthält.From the DE 10 2012 112 755 A1 is a generic centric clamping device known. This has a base body, two slidably guided on the base body clamping jaws and rotatably mounted on the base body by means of a spindle bearing adjusting spindle for the opposite adjustment of the two jaws. The spindle bearing is in this known clamping device of a fastened by screws on the main body bearing piece, which contains a cup-shaped bearing web for engagement in an annular groove of the adjusting spindle.

In der DE 20 2004 009 517 U1 ist eine Spanneinrichtung mit einem Grundkörper und zwei Spannbacken offenbart, die einander gegenüberliegend an dem Grundkörper angeordnet und entlang einer gemeinsamen Achse aufeinander zu und voneinander weg verstellbar geführt sind. Die Verstellung der Spannbacken erfolgt über eine Stellspindel, die in einem zentralen Lagergehäuse drehbar gelagert ist und an ihren Endbereichen Außengewindeabschnitte gegensätzlicher Steigung aufweist, welche in die Spannbacken eingeschraubt sind.In the DE 20 2004 009 517 U1 discloses a clamping device with a base body and two clamping jaws, which are arranged opposite to each other on the base body and guided along a common axis towards and away from each other adjustable. The adjustment of the clamping jaws via an adjusting spindle, which is rotatably mounted in a central bearing housing and at its end portions has external thread sections opposite slope, which are screwed into the clamping jaws.

Die DE 10 2013 104 467 A1 offenbart einen Zentrischspanner, bei dem an einem Grundkörper zwei gegeneinander verstellbare Spannbacken verschiebbar geführt sind. Die Spannbacken sind über eine in einem mittigen Lagerblock drehbar gelagerte Gewindespindel verstellbar.The DE 10 2013 104 467 A1 discloses a Zentrischspanner in which two mutually adjustable clamping jaws are guided displaceably on a base body. The clamping jaws are adjustable via a rotatably mounted in a central bearing block threaded spindle.

Die DE 297 23 435 U1 offenbart eine Zentrisch-Spannvorrichtung mit zwei linear geführt gegeneinander bewegbaren Spannschlitten. Die Verstellung der Spannschlitten erfolgt durch eine innerhalb eines Lagerblocks drehbar gelagerte Gewindespindel, die an ihren beiden Enden gegenläufige Gewindeabschnitte zum Eingriff in Gewindemuttern zweier Kolben aufweist.The DE 297 23 435 U1 discloses a centric clamping device with two linearly guided against each other movable clamping slide. The adjustment of the clamping carriage is effected by a rotatably mounted within a bearing block threaded spindle having opposite threaded portions at both ends for engagement in threaded nuts of two pistons.

Aus der EP 1 688 219 A1 ist eine Spanneinrichtung mit einer an einem Grundkörper fest angeordneten ersten Spannbacke und einer am Grundkörpers verstellbar geführten zweiten Spannbacke bekannt. Die zweite Spannbacke ist mittels einer in einer Spindelausnehmung des Grundkörpers angeordneten Schraubspindel verstellbar. Zur Vermeidung von Verschmutzungen ist die Spindelausnehmung des Grundkörpers zwischen den beiden Spannbacken über den gesamten Verstellbereich der Spannbacken durch ein Deckelement abgedeckt.From the EP 1 688 219 A1 is a clamping device with a fixedly arranged on a main body first jaw and an adjustable guided on the base second jaw known. The second clamping jaw is adjustable by means of a arranged in a spindle recess of the main body screw. To avoid contamination, the spindle recess of the base body is covered by a cover element between the two clamping jaws over the entire adjustment range of the clamping jaws.

Die DE 10 2007 027 808 B3 betrifft eine Spannvorrichtung, bei der die Träger der Spannbacken als die Verstellspindel umschließende Halbschalen ausgebildet sind.The DE 10 2007 027 808 B3 relates to a clamping device in which the carriers of the clamping jaws are designed as shells enclosing the adjusting spindle.

Aufgabe der Erfindung ist es, eine Zentrisch-Spannvorrichtung der eingangs genannten Art zu schaffen, die eine gegen Verschmutzung optimal geschützte Spindelllagerung mit hoher Genauigkeit enthält.The object of the invention is to provide a centric clamping device of the type mentioned, which contains an optimally protected against contamination spindle bearing with high accuracy.

Diese Aufgabe wird durch eine Zentrisch-Spannvorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Zweckmäßige Weiterbildungen und vorteilhafte Ausführungsformen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by a centric clamping device with the features of claim 1. Advantageous developments and advantageous embodiments of the invention are the subject of the dependent claims.

Bei der erfindungsgemäßen Zentrisch-Spannvorrichtung ist die Spindellagerung in einem Lagerblock untergebracht und weist zwei innerhalb des Lagerblocks axial verstellbare Lagerhülsen auf. Durch die axiale Verstellung der beiden Lagerhülsen kann nicht nur axiale Lage der Verstellspindel bezüglich des Grundkörpers eingestellt werden, über eine gegenseitige Verstellung der beiden Lagerhülsen kann die Spindellagerung außerdem vorgespannt und spielfrei eingestellt werden. Dadurch ist eine hohe Präzision und gute Wiederholgenauigkeit erreichbar. Außerdem ist die Verstellspindel über den Lagerblock im Bereich der Lagerung komplett abgedeckt und abgedichtet. Die Zentrisch-Spannvorrichtung ist somit unempfindlich gegen Späne und die Verstellspindel ist in einem geschlossenen System vor Verschmutzungen geschützt.In the centric clamping device according to the invention, the spindle bearing is housed in a bearing block and has two bearing sleeves axially adjustable within the bearing block. Due to the axial adjustment of the two bearing sleeves not only axial position of the adjusting spindle can be adjusted with respect to the body, via a mutual adjustment of the two bearing sleeves, the spindle bearing can also be biased and adjusted without play. This achieves high precision and good repeatability. In addition, the adjusting spindle is completely covered and sealed over the bearing block in the storage area. The centric clamping device is therefore insensitive to chips and the adjusting spindle is protected against contamination in a closed system.

In einer besonders reibungsarmen und positionsgenau einstellbaren Ausführung kann die Spindellagerung als Rollenlagerung mit mehreren zwischen den Lagerhülsen und der Verstellspindel geführten Wälzkörpern ausgebildet sein. Die Verstellspindel kann hierzu z.B. zwei voneinander beabstandete Ringnuten zur innenseitigen Lagerung der z.B. als Kugeln ausgebildeten Wälzköper aufweisen. Die beiden Lagerhülsen können an den einander zugewandten Stirnseiten jeweils eine schulterförmige Lagerfläche zur außenseitigen Lagerung der Wälzköper enthalten. Durch gegenseitiges Verspannen der beiden Lagerhülsen, können die schulterförmigen Lagerflächen zur Anlage an den Kugeln gebracht und somit eine möglichst spielfreie Einstellung erreicht werden. Die Spindellagerung könnte aber auch als Gleitlagerung mit axial verstellbaren Gleitlagerhülsen ausgebildet sein.In a particularly low-friction and positionally adjustable design, the spindle bearing can be designed as a roller bearing with a plurality of rolling elements guided between the bearing sleeves and the adjusting spindle. The adjusting spindle can be used for this purpose, e.g. two spaced-apart annular grooves for internally supporting the e.g. Having trained as balls Wälzköper. The two bearing sleeves may each contain a shoulder-shaped bearing surface for the outside bearing of the Wälzköper at the facing end faces. By mutual clamping of the two bearing sleeves, the shoulder-shaped bearing surfaces can be brought to bear against the balls and thus a possible backlash-free adjustment can be achieved. The spindle bearing could also be designed as a plain bearing with axially adjustable plain bearing sleeves.

Eine einfache axiale Verstellung der Lagerhülsen kann dadurch erreicht werden, dass die beiden Lagerhülsen jeweils ein Außengewinde zum Eingriff in ein entsprechendes Innengewinde einer durch den Lagerblock verlaufenden Durchgangsöffnung aufweisen.A simple axial adjustment of the bearing sleeves can be achieved in that the two bearing sleeves each have an external thread for engagement in a corresponding internal thread extending through the bearing block passage opening.

In einer besonders stabilen und vor Verschmutzung optimal geschützten Bauweise kann der über den gesamten Umfang geschlossene Lagerblock einteilig mit dem Grundkörper ausgebildet sein. Ein optimierter Späneabfluss ist dadurch erreichbar, dass von Vertiefungen zwischen dem Lagerblock und zwei Seitenwangen des Grundkörpers nach außen führende Durchgänge mit schräg nach unten führenden Bodenflächen angeordnet sind.In a particularly stable construction, which is optimally protected against contamination, the bearing block closed over the entire circumference can be formed integrally with the base body. An optimized chip discharge can be achieved in that passages extending from the recesses between the bearing block and two side cheeks of the main body are arranged to the outside with inclined bottom surfaces.

Gemäß einer weiteren vorteilhaften Ausführung können die beiden Spannbacken über in dem Grundkörper verschiebbar geführte Schieber verstellbar sein. Die Schieber können so in den Grundkörper eingebaut sein, dass sich eine vor Verschmutzung geschützte und gegen Späne unempfindliche Bauweise ergibt. Die Verstellspindel weist zweckmäßigerweise zwei als Rechts- bzw. Linksgewinde ausgeführte Außengewinde zum Eingriff mit entsprechenden Innengewinden an Durchgangsbohrungen der beiden Schieber auf.According to a further advantageous embodiment, the two clamping jaws can be adjusted via slides displaceably guided in the base body. The slides can be installed in the body so that there is a protected against dirt and insensitive to chips construction. The adjusting spindle expediently has two external threads designed as right-handed or left-handed threads for engagement with corresponding internal threads on through-holes of the two slides.

Die Spannbacken sind vorzugsweise lösbar auf den Schiebern befestigt. Dadurch können die Spannbacken bei Bedarf ausgetauscht und an die jeweilige Spannaufgabe angepasst werden. Die Spannbacken können eine beliebige Form aufweisen.The jaws are preferably releasably secured to the slides. As a result, the jaws can be replaced if necessary and adapted to the respective clamping task. The jaws can have any shape.

Weitere Besonderheiten und Vorzüge der Erfindung ergeben sich aus der folgenden Beschreibung eines bevorzugten Ausführungsbeispiels anhand der Zeichnung. Es zeigen:

Figur 1
eine erfindungsgemäße Zentrisch-Spannvorrichtung in einer Perspektive von oben;
Figur 2
die Zentrisch-Spannvorrichtung von Figur 1 in einer Perspektive von unten;
Figur 3
die Zentrisch-Spannvorrichtung von Figur 1 in einer Draufsicht;
Figur 4
die Zentrisch-Spannvorrichtung von Figur 1 in einem Längsschnitt entlang der Linie A-A von Figur 3;
Figur 5
eine vergrößerte Detailansicht des Bereichs C von Figur 4;
Figur 6
die Zentrisch-Spannvorrichtung von Figur 1 in einer Seitenansicht;
Figur 7
einen Querschnitt entlang der Linie B-B von Figur 6 und
Figur 8
eine vergrößerte Detailansicht des Bereichs D von Figur 7.
Other features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. Show it:
FIG. 1
a centric clamping device according to the invention in a perspective from above;
FIG. 2
the centric clamping device of FIG. 1 in a perspective from below;
FIG. 3
the centric clamping device of FIG. 1 in a plan view;
FIG. 4
the centric clamping device of FIG. 1 in a longitudinal section along the line AA of FIG. 3 ;
FIG. 5
an enlarged detail view of the area C of FIG. 4 ;
FIG. 6
the centric clamping device of FIG. 1 in a side view;
FIG. 7
a cross section along the line BB of FIG. 6 and
FIG. 8
an enlarged detail view of the area D of FIG. 7 ,

Die in den Figuren 1 bis 4 in unterschiedlichen Ansichten dargestellte Zentrisch-Spannvorrichtung enthält einem Grundkörper 1, an dem zwei Spannbacken 2 und 3 über Schieber 4 und 5 verschiebbar geführt und durch einen Verstellmechanismus mit einer Verstellspindel 6 gegenläufig verstellbar sind. Der Grundkörper 1 weist zwei voneinander beabstandete Seitenwangen 7 und 8 mit oberen Führungsflächen 9 und 10 auf. Bei der gezeigten Ausführungsform sind die beiden Führungsflächen 9 und 10 an einem gehärteten und geschliffenen oberen Teil der beiden Seitenwangen 7 und 8 des Grundkörpers 1 ausgeführt. Die Führungsflächen 9 und 10 können aber auch an gesonderten und bei Bedarf auswechselbaren Führungsschienen oder Führungsleisten angeordnet sein. Zwischen den beiden Seitenwangen 7 und 8 des Grundkörpers 1 sind die beiden Schieber 4 und 5 eingepasst und verschiebbar geführt. Bei dem gezeigten Ausführungsbeispiel weisen die Schieber 4 und 5 einen stufenförmigen Querschnitt mit einer oberen Auflagefläche 11 auf.The in the FIGS. 1 to 4 shown in different views centric clamping device includes a base body 1, on which two clamping jaws 2 and 3 slidably guided via slides 4 and 5 and are adjustable in opposite directions by an adjusting mechanism with an adjusting spindle 6. The base body 1 has two spaced side cheeks 7 and 8 with upper guide surfaces 9 and 10. In the embodiment shown, the two guide surfaces 9 and 10 are executed on a hardened and ground upper part of the two side cheeks 7 and 8 of the main body 1. The guide surfaces 9 and 10 can also be arranged on separate and replaceable if necessary guide rails or guide rails. Between the two side walls 7 and 8 of the main body 1, the two slides 4 and 5 are fitted and guided displaceably. In the embodiment shown, the slides 4 and 5 have a stepped cross-section with an upper bearing surface 11.

Wie aus Figur 4 hervorgeht, sind in der oberen Auflagefläche 11 der beiden Schieber 4 und 5 jeweils zwei in Längsrichtung des Grundkörpers 1 gesehen hintereinander liegende Vertiefungen 12 und 13 zum formschlüssigen Eingriff eines von der Unterseite der Spannbacken 2 und 3 nach unten vorstehenden Ansatzes 14 angeordnet. Dadurch können die Spannbacken 2 und 3 nach innen oder außen versetzt und durch in Figur 3 erkennbare Schrauben 15 an dem jeweiligen Schieber 4 bzw. 5 positionsgenau befestigt werden. Die Spannbacken 2 und 3 können eine beliebige, an die jeweilige Spannaufgabe angepasste Form aufweisen. Bei der gezeigten Ausführung sind die Spannbacken 2 und 3 als Wendebacken mit unterschiedlichem Spannflächen ausgeführt. Durch Umdrehen der Spannbacken 2 und 3 kann so der Spannbereich auf einfache Weise erweitert bzw. verändert werden.How out FIG. 4 It can be seen, in the upper bearing surface 11 of the two slides 4 and 5 each seen in the longitudinal direction of the body 1 successive recesses 12 and 13 for the positive engagement of a bottom of the jaws 2 and 3 downwardly projecting projection 14 is arranged. This allows the jaws 2 and 3 offset inwards or outwards and through in FIG. 3 recognizable screws 15 are fixed to the respective slide 4 and 5 positionally accurate. The clamping jaws 2 and 3 can have any shape adapted to the respective clamping task. In the embodiment shown, the clamping jaws 2 and 3 are designed as turning jaws with different clamping surfaces. By turning the jaws 2 and 3 so the clamping range can be easily extended or changed.

In der Mitte des Grundkörpers 1 ist zwischen den beiden Seitenwangen 7 und 8 ein nach oben und zur Seite geschlossener Lagerblock 16 zur Lagerung der Verstellspindel 6 angeordnet. Die beiden Schieber 4 und 5 weisen an den einander zugewandeten Stirnseiten eine Ausnehmung 17 oder eine Abdeckung zur Aufnahme des Lagerblocks 16 und zur Abdeckung der Verstellspindel 6 auf. Dadurch können die beiden Schieber 4 und 5 unter Abdeckung der Verstellspindel 6 über dem Lagerblock 16 zusammengeschoben werden. Durch die Ausnehmungen 17 oder die Abdeckungen an den Schiebern 4 und 5 wird die Verstellspindel 6 abgedeckt und die Späne werden abgelenkt. Innerhalb des Lagerblocks 16 ist die Verstellspindel 6 durch eine im Folgenden noch näher erläuterte Spindellagerung 18 um ihre Längsachse drehbar und in Axialrichtung gesichert gelagert.In the middle of the base body 1, an upwardly and to the side closed bearing block 16 for supporting the adjusting spindle 6 is arranged between the two side cheeks 7 and 8. The two slides 4 and 5 have at the mutually facing end faces a recess 17 or a cover for receiving the bearing block 16 and for covering the adjusting spindle 6. As a result, the two slides 4 and 5 can be pushed together to cover the adjusting spindle 6 above the bearing block 16. Through the recesses 17 or the covers on the slides 4 and 5, the adjusting spindle 6 is covered and the chips are deflected. Within the bearing block 16, the adjusting spindle 6 is rotatable about its longitudinal axis and secured in the axial direction by a spindle bearing 18 which will be explained in more detail below.

Aus Figur 4 ist ersichtlich, dass die innerhalb des Lagerblocks 16 mittig gelagerte Verstellspindel 6 einen gegenüber dem Grundköper 1 und dem Schieber 5 nach außen vorstehenden und hier mit einem Außensechskant versehenen Stellzapfen 19 sowie zwei als Rechts- bzw. Linksgewinde ausgeführte Außengewinde 20 bzw. 21 zum Eingriff mit entsprechenden Innengewinden 22 bzw. 23 an Durchgangsbohrungen 24 und 25 der beiden Schieber 4 und 5 enthält. Durch Drehung des Stellzapfens 19 mit Hilfe einer geeigneten Handkurbel oder eines anderen Betätigungselements können so die beiden Schieber 4 und 5 entgegengesetzt zueinander verschoben und die Spannbacken 2 und 3 somit gleichzeitig zusammen- bzw. auseinander gefahren werden. Über ringförmige Dichtelemente 26 sind die beiden Schieber 4 und 5 an ihren einander zugewandten Stirnseiten gegenüber der Verstellspindel 6 abgedichtet.Out FIG. 4 It can be seen that the adjusting spindle 6 mounted centrally within the bearing block 16 has a relative to the base body 1 and the slider 5 outwardly projecting and here provided with an external hexagonal adjusting pin 19 and two designed as right- or left-hand thread 20 and 21 for engagement with corresponding internal threads 22 and 23 at through holes 24 and 25 of the two slides 4 and 5 contains. By rotation of the adjusting pin 19 by means of a suitable hand crank or another actuating element, the two slides 4 and 5 can be displaced in opposite directions and the clamping jaws 2 and 3 can thus be moved together or apart at the same time. About annular sealing elements 26, the two slides 4 and 5 are sealed at their mutually facing end faces relative to the adjusting spindle 6.

Der in Figur 5 im Detail dargestellte Lagerblock 16 ist bei der gezeigten Ausführung einteilig mit dem Grundkörper 1 ausgeführt und enthält eine in Längsrichtung des Grundkörpers 1 verlaufende Durchgangsöffnung 27, in der die Spindellagerung 18 für die Verstellspindel 6 untergebracht ist. Die Spindellagerung 18 umfasst zwei innerhalb der Durchgangsöffnung 27 axial verstellbar angeordnete Lagerhülsen 28 und 29, in denen die Verstellspindel 6 drehbar gelagert ist. Die Verstellspindel 6 enthält einen zentralen Ringbund 30 und zwei rechts und links vom Ringbund 30 vorgesehene Ringnuten 31 bzw. 32, in denen über den Umfang der Verstellspindel 6 verteilte Wälzkörper 33 gelagert sind. Die beiden Lagerhülsen 28 und 29 weisen jeweils ein Außengewinde 34 zum Eingriff in ein entsprechendes Innengewinde 35 der Durchgangsöffnung 27 auf und enthalten an den einander zugewandten Stirnseiten jeweils eine schulterförmige Lagerfläche 36, an der die innenseitig in den beiden Ringnuten 31 und 32 geführten und hier als Kugeln ausgebildeten Wälzkörper 33 außenseitig zur Anlage gelangen. Durch eine gleichgerichtete Verstellung der beiden Lagerhülsen 28 und 29 innerhalb des Lagerblocks 16 kann die Lage der Verstellspindel 6 bezüglich des Grundkörpers 1 eingestellt werden. Über einen gegenseitige Verstellung der beiden Lagerhülsen 28 und 29 kann die Spindellagerung 18 dagegen vorgespannt und spielfrei eingestellt werden.The in FIG. 5 bearing block 16 shown in detail is embodied in one piece with the main body 1 in the embodiment shown and contains a passage opening 27 extending in the longitudinal direction of the main body 1, in which the spindle bearing 18 is accommodated for the adjusting spindle 6. The spindle bearing 18 comprises two axially adjustable within the passage opening 27 arranged bearing sleeves 28 and 29, in which the adjusting spindle 6 is rotatably mounted. The adjusting spindle 6 includes a central annular collar 30 and two provided on the right and left of the annular collar 30 annular grooves 31 and 32, in which over the circumference of the adjusting spindle 6 distributed rolling elements 33 are mounted. The two bearing sleeves 28 and 29 each have an external thread 34 for engagement in a corresponding internal thread 35 of the through hole 27 and contain at the facing end faces each have a shoulder-shaped bearing surface 36 on which the inside guided in the two annular grooves 31 and 32 and here as Balls trained rolling elements 33 outside to the plant reach. By a rectified adjustment of the two bearing sleeves 28 and 29 within the bearing block 16, the position of the adjusting spindle 6 with respect to the base body 1 can be adjusted. By mutual adjustment of the two bearing sleeves 28 and 29, the spindle bearing 18, however, can be biased and adjusted without play.

In den Figuren 7 und 8 ist der zwischen den beiden Seitenwangen des Grundkörpers 1 angeordnete zentrale Lagerblock 16 in einem Querschnitt gezeigt. Zwischen dem Lagerblock 16 und den beiden Seitenwangen 7 und 8 des Grundkörpers 1 sind Vertiefungen 37 mit Senkbohrungen 38 zur Befestigung des Grundkörpers 1 auf einem Maschinentisch oder dgl. vorgesehen. In den beiden Seitenwangen 7 und 8 sind von den Vertiefungen 37 nach außen führende Durchgänge 39 mit schräg nach unten führenden Bodenflächen 40 angeordnet. Dadurch können in die Vertiefungen 37 gelangende Späne auf einfache und effektive Weise nach außen abgeführt werden. Durch die Ausnehmungen 17 oder die Abdeckungen an den Schiebern 4 und 5 wird die Verstellspindel 6 und auch der Lagerblock 16 abgedeckt und die Späne werden zu den Vertiefungen 37 und von dort über die Durchgänge 39 nach außen gelenkt.In the FIGS. 7 and 8 the arranged between the two side walls of the base body 1 central bearing block 16 is shown in a cross section. Between the bearing block 16 and the two side walls 7 and 8 of the base body 1 recesses 37 are provided with counterbores 38 for attachment of the base body 1 on a machine table or the like. In the two side walls 7 and 8 of the recesses 37 outwardly leading passages 39 are arranged with sloping bottom surfaces 40. As a result, chips reaching into the recesses 37 can be discharged to the outside in a simple and effective manner. Through the recesses 17 or the covers on the slides 4 and 5, the adjusting spindle 6 and the bearing block 16 is covered and the chips are directed to the recesses 37 and from there via the passages 39 to the outside.

Bei der gezeigten Ausführung sind die beiden Spannbacken 2 und 3 als Wendebacken ausgebildet und weisen an der einen Seite gerade und an der anderen Seite treppenförmige Spannflächen auf. Durch Umdrehen der Spannbacken 2 und 3 kann so der Spannbereich auf einfache Weise erweitert werden. Die Spannbacken 2 und 3 können aber auch jede andere beliebige, an die jeweilige Spannaufgabe angepasste, Form aufweisen.In the embodiment shown, the two clamping jaws 2 and 3 are formed as turning jaws and have on one side straight and on the other side stepped clamping surfaces. By turning the jaws 2 and 3 so the clamping area on easy way to be extended. But the jaws 2 and 3 can also have any other, adapted to the respective clamping task, shape.

Claims (13)

  1. Centrical clamping device which includes a base body (1), two clamping jaws (2, 3) guided slidably on the base body (1) and an adjusting spindle (6) mounted rotatably on the base body (1) by means of a spindle mounting (18), for displacing the twoclamping jaws (2, 3) in opposite directions, characterised in that the spindle mounting (18) is accommodated in a bearing block (16) and includes two bearing bushings (28, 29) which are axially displaceable within the bearing block (16).
  2. Centricalclamping device according to claim 1, characterised in that the spindle mounting (18) is designed as a roller mounting having a plurality of rolling elements (33) arranged between the bearing bushings (28, 29) and the adjusting spindle (6).
  3. Centrical clamping device according to claim 2, characterised in that the adjusting spindle (6) includes two spaced-apart annular grooves (31, 33) for mounting the rolling elements (33) on the inside.
  4. Centrical clamping device according to claim 2 or 3, characterised in that the two bearing bushings (28, 29) have a shoulder-like bearing surface (36) on each of the end faces facing towards each other for mounting the rolling elements (33) on the outside.
  5. Centrical clamping device according to one of claims 1 to 4, characterised in that the two bearing bushings (28, 29) each have an external thread (34) for engagement in a corresponding internal thread (35) of a through-opening (27) running through the bearing block (16).
  6. Centrical clamping device according to one of claims 1 to 5, characterised in that the bearing block (16) is constructed in one part with the base body (1).
  7. Centrical clamping device according to one of claims 1 to 6, characterised in that the two clamping jaws (2, 3) are displaceable by means of slides (4, 5) which are guided slidably in the base body (1).
  8. Centrical clamping device according to claim 7, characterised in that the adjusting spindle (6) includes two external threads (20, 21) designed as right-handed or left-handed threads for engagement with corresponding internal threads (22, 23) on through-bores (24, 25) of the two slides (4, 5).
  9. Centricalclamping device according to claim 7 or 8, characterised in that the two clamping jaws (2, 3) are releasably attached to the slides (4, 5).
  10. Centrical clamping device according to one of claims 7 to 9, characterised in that the two slides (4, 5) have a recess (17) or a cover on the end faces facing towards each other for receiving the bearing block (16) and for covering the adjusting spindle (6).
  11. Centrical clamping device according to one of claims 1 to 10, characterised in that the bearing block (16) is arranged between two side plates (7, 8) of the base body (1).
  12. Centrical clamping device according to claim 11, characterised in that depressions (37) are arranged between the bearing block (16) and the two side plates (7, 8).
  13. Centrical clamping device according to claim 12, characterised in that in the two side plates (7, 8) are arranged passages (39) with obliquely downwardly extending bottom surfaces (40), which extend outwardly from the depressions (37).
EP15174952.0A 2014-07-23 2015-07-02 Centrical tensioning device Active EP2977145B2 (en)

Applications Claiming Priority (1)

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DE102014110352.1A DE102014110352B3 (en) 2014-07-23 2014-07-23 Centric jig

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EP2977145A1 EP2977145A1 (en) 2016-01-27
EP2977145B1 true EP2977145B1 (en) 2017-05-10
EP2977145B2 EP2977145B2 (en) 2022-10-26

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Publication number Publication date
US20160023329A1 (en) 2016-01-28
EP2977145A1 (en) 2016-01-27
DE102014110352B3 (en) 2015-10-08
EP2977145B2 (en) 2022-10-26
US9962812B2 (en) 2018-05-08

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