EP1775467B1 - Switchable eccentric drive and stirring device with switchable radial piston pump - Google Patents

Switchable eccentric drive and stirring device with switchable radial piston pump Download PDF

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Publication number
EP1775467B1
EP1775467B1 EP06020696A EP06020696A EP1775467B1 EP 1775467 B1 EP1775467 B1 EP 1775467B1 EP 06020696 A EP06020696 A EP 06020696A EP 06020696 A EP06020696 A EP 06020696A EP 1775467 B1 EP1775467 B1 EP 1775467B1
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EP
European Patent Office
Prior art keywords
eccentric
switchable
sleeve
eccentricity
eccentric shaft
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EP06020696A
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German (de)
French (fr)
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EP1775467A1 (en
Inventor
Bernhard Eckert
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Eugen Woerner & Co KG GmbH
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Eugen Woerner & Co KG GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/123—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/125—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts
    • F04B49/126—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts with a double eccenter mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft

Definitions

  • the invention relates to a switchable eccentric drive with an eccentric shaft, wherein the eccentric shaft has an eccentric eccentric to a rotational axis of the eccentric shaft arranged eccentric and a radial piston pump according to the independent claim 12th
  • Eccentric drives for radial piston pumps or other assemblies that are to be placed in an oscillating motion have long been known. They are simple, inexpensive to produce and extremely reliable.
  • a disadvantage of these eccentric drives is that their eccentricity is determined constructively. As a result, the flow rate of a radial piston pump is coupled directly to the speed of the eccentric shaft. Furthermore, it is impossible because of the eccentricity defined by design, to achieve a zero promotion of the radial piston pump with rotating eccentric shaft.
  • an eccentric drive according to the preamble of claim 1 is known.
  • this eccentric eccentric shaft and eccentric sleeve are coupled together via a torsion spring.
  • the stroke is determined by the Widestand, which opposes the driven by the eccentric drive unit of the rotational movement of the eccentric drive.
  • the invention is based on the object to provide a switchable eccentric, which allows different eccentricities and at the same time has a simple structure.
  • the inventive combination of an eccentric shaft with an eccentric portion and an eccentric sleeve it is possible to change the stroke of the eccentric sleeve in dependence on the direction of rotation of the eccentric shaft. This is due to the fact that in a first direction of rotation of the eccentric shaft, the eccentricity of the eccentric portion and the eccentricity of the eccentric sleeve add, while subtracting in the opposite direction of rotation. This also means that the aforementioned eccentricities can cancel out in one direction of rotation, so that a zero delivery of the driven by the eccentric shaft pump element adjusts itself.
  • this constructive design of the switchable eccentric has the function of a simple freewheel, but it is much easier to produce manufacturing technology than conventional freewheels.
  • the eccentricities of the eccentric portion and the eccentric sleeve are not the same size, it is possible to set a first delivery stroke in a first direction of rotation and to change the delivery stroke by changing the direction of rotation of the eccentric shaft. This makes it possible, at the same speed of the eccentric shaft to realize different flow rates of driven by the eccentric shaft pump elements. As a result, the switchable eccentric drive is thus suitable for flow control.
  • stop means In order to ensure that in both directions of rotation of the eccentric shaft, the eccentric sleeve occupies a defined position relative to the eccentric portion of the eccentric shaft, stop means according to the invention are provided, which limit the rotation of the eccentric sleeve relative to the eccentric portion.
  • the stop means may comprise a pin and a circular arc-shaped groove cooperating with the pin or a shoulder cooperating with the pin.
  • the stop means comprise a claw, as it is known from a dog clutch, which cooperates with a circular arc-shaped groove or a shoulder.
  • the eccentricity of the eccentric portion is equal to the eccentricity of the eccentric sleeve.
  • the eccentricity of the eccentric portion is smaller or larger than the eccentricity of the eccentric sleeve.
  • the switchable eccentric drive according to the invention is particularly suitable for generating an oscillating movement, in particular for driving a radial piston pump.
  • the eccentric shaft is coupled to a further consumer, in particular a stirring blade of an agitator.
  • a stirring blade of an agitator This makes it possible, when driving the eccentric shaft in a first direction of rotation to drive both the impeller and the radial piston pump and to drive when changing the direction of rotation of the eccentric shaft only the impeller while zero promotion of the radial piston pump.
  • FIG. 1 is a longitudinal section through a housing 1, which may be, for example, a pump housing of a radial piston pump shown.
  • a housing 1 which may be, for example, a pump housing of a radial piston pump shown.
  • an eccentric shaft 3 is rotatably mounted in FIG. 1 provided with the reference numeral 5.
  • the eccentric shaft 3 has an eccentric section 7.
  • the eccentricity of the eccentric 7 with respect to the axis of rotation 5 is in FIG. 1 denoted by e 1 .
  • an eccentric sleeve 9 is rotatably mounted.
  • the eccentric sleeve 9 has a circular outer contour, as can be seen for example from the Figures 2 and 3 results. Eccentrically to a central axis 11 of the eccentric sleeve 9, a bore 13 in the eccentric sleeve 9 is present.
  • the bore 13 has the same diameter as the eccentric portion 7 of the eccentric shaft 3 and serves as a bearing of the eccentric sleeve 9 on the eccentric 7.
  • the eccentricity of the bore 13 with respect to the central axis 11 of the eccentric sleeve 9 is in FIG. 1 denoted by ez.
  • a pin 15 is provided, which engages in an arcuate groove 17 in the eccentric sleeve 9.
  • the groove 17 extends concentrically to the bore 13 in the eccentric sleeve 9 and comprises an angle of about 180 °.
  • the groove 17 and the pin 15 have the function of a rotation angle limit and a stop. They ensure that the eccentric sleeve 9 is rotatable only by a certain angle relative to the eccentric portion 7. Furthermore, with the aid of the pin 15 and the groove 17, a torque between the eccentric shaft 3 and the eccentric sleeve 9 can be transmitted.
  • a piston 19 of a radial piston pump rests on the outer diameter of the eccentric sleeve 9 and is held by a spring, not shown, in contact with the eccentric sleeve 9, the piston 19 of a radial piston pump can be set by rotating the eccentric shaft 3 in an oscillating motion.
  • FIG. 2 is a section along the line AA according to FIG. 1 shown, wherein the eccentric shaft 3 is rotated counterclockwise. In this illustration, the circular arc-shaped groove 17 is clearly visible.
  • the pin 15 locks the eccentric sleeve 9 relative to the eccentric shaft 3 in the in FIG. 2 position shown. simultaneously the drive torque is transmitted from the eccentric shaft 3 to the eccentric sleeve 9.
  • the eccentricity e 1 of the eccentric portion 9 is the same size as the eccentricity e 2 of the eccentric sleeve 9. However, this need not always be so.
  • FIG. 4 an application example of a switchable eccentric drive according to the invention is shown.
  • a geared motor 25 the rotatably mounted in the pump housing 1 eccentric shaft 3 is driven.
  • an eccentric sleeve 9 is provided at the eccentric portion 7 of the eccentric shaft 3, as shown in the FIGS. 1 to 3 explained in detail.
  • the eccentric sleeve 9 drives the pistons (not shown) of two oppositely arranged pump elements 27.
  • a cap 28 is provided, which serves on the one hand to fix the eccentric sleeve 9 in the axial direction and on the other hand to drive an agitator 29 of a designated in its entirety by the reference numeral 31 agitator.
  • the cap 28 is arranged coaxially to the axis of rotation 5 of the eccentric shaft, so that the or Impeller 29 describe a circular path which is concentric with the axis of rotation 5.
  • This arrangement is particularly advantageous if in certain operating conditions of lubricating the medium contained in the agitator 31 is to be stirred, for example, to lead out air bubbles from the fluid, without at the same time promote the pump elements 27.
  • the medium contained in the agitator 31 should be homogenized without the pump elements 27 promoting the radial piston pump.
  • the direction of rotation of the eccentric shaft 3 and the geared motor 25 is reversed, so that the eccentricities e 1 and e 2 add and the promotion of the pump elements 27 begins according to, as shown in FIG. 2 was explained in detail.
  • the impellers 29 are also driven by the drive of the pump elements 27, so that even in this operating state stirring of the conveying medium located in the agitator 31 is ensured.
  • the impellers 29 may be configured to have a stirring action that is rotational direction dependent.

Abstract

The arrangement has an eccentric shaft (3) with an eccentric section (7) with an eccentric sleeve mounted on it so as to be rotatable with respect to the sleeve by an angle of less than 360 degrees, preferably less than or equal to 180 degrees. It has a stop arrangement (15) that limits the rotation of the eccentric sleeve relative to the eccentric section. An independent claim is also included for a radial piston pump.

Description

Die Erfindung betrifft einen schaltbaren Exzenterantrieb mit einer Exzenterwelle, wobei die Exzenterwelle einen exzentrisch zu einer Drehachse der Exzenterwelle angeordneten Exzenterabschnitt aufweist und eine Radialkolbenpumpe nach dem nebengeordneten Anspruch 12.The invention relates to a switchable eccentric drive with an eccentric shaft, wherein the eccentric shaft has an eccentric eccentric to a rotational axis of the eccentric shaft arranged eccentric and a radial piston pump according to the independent claim 12th

Exzenterantriebe für Radialkolbenpumpen oder andere Baugruppen, die in eine oszillierende Bewegung versetzt werden sollen, sind seit langem bekannt. Sie sind einfach aufgebaut, kostengünstig herstellbar und äußerst zuverlässig.Eccentric drives for radial piston pumps or other assemblies that are to be placed in an oscillating motion have long been known. They are simple, inexpensive to produce and extremely reliable.

Nachteilig an diesen Exzenterantrieben ist, dass ihre Exzentrizität konstruktiv festgelegt ist. Dadurch ist die Fördermenge einer Radialkolbenpumpe direkt an die Drehzahl der Exzenterwelle gekoppelt. Des Weiteren ist es wegen der konstruktiv festgelegten Exzentrizität auch unmöglich, bei drehender Exzenterwelle eine Nullförderung der Radialkolbenpumpe zu erreichen.A disadvantage of these eccentric drives is that their eccentricity is determined constructively. As a result, the flow rate of a radial piston pump is coupled directly to the speed of the eccentric shaft. Furthermore, it is impossible because of the eccentricity defined by design, to achieve a zero promotion of the radial piston pump with rotating eccentric shaft.

Aus der DE 41 22 486 A1 ist ein verstellbarer Exzenterantrieb nach dem Oberbegriff des Anspruchs 1 bekannt. Bei diesem Exzenterantrieb wird der Hub von zwei Pumpenelemente dadurch eingestellt, dass die Exzenterscheibe relativ zu der Exzenterwelle mittels eines hydraulischen Aktuators und einem als Blattfeder ausgebildeten Übertragungsglied verdreht wird. Diese Art der Verstellung ist relativ aufwändig.From the DE 41 22 486 A1 is an adjustable eccentric drive according to the preamble of claim 1 is known. In this eccentric the stroke of two pump elements is adjusted by the eccentric disc is rotated relative to the eccentric shaft by means of a hydraulic actuator and a transmission element formed as a leaf spring. This type of adjustment is relatively expensive.

Aus der CH 204 332 A ist ein Exzenterantrieb nach dem Oberbegriff das Anspruchs 1 bekannt. Bei diesem Exzenterantrieb sind Exzenterwelle und Exzenterhülse über eine Torsionsfeder miteinander gekoppelt. Bei diesem Exzenterantrieb wird der Hub durch den Widestand, welche das von dem Exzenterantrieb anzugetriebene Aggregat der Drehbewegung der Exzenterantriebs entgegensetzt, bestimmt.From the CH 204 332 A is an eccentric drive according to the preamble of claim 1 is known. In this eccentric eccentric shaft and eccentric sleeve are coupled together via a torsion spring. In this eccentric the stroke is determined by the Widestand, which opposes the driven by the eccentric drive unit of the rotational movement of the eccentric drive.

Der Erfindung liegt die Aufgabe zu Grunde, einen schaltbaren Exzenterantrieb bereitzustellen, der verschiedene Exzentrizitäten ermöglicht und gleichzeitig einfach aufgebaut ist.The invention is based on the object to provide a switchable eccentric, which allows different eccentricities and at the same time has a simple structure.

Diese Aufgabe wird bei einem schaltbaren Exzenter mit einer Exzenterwelle nach dem Oberbegriff des Anspruchs 1 mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst.This object is achieved with a switchable eccentric with an eccentric shaft according to the preamble of claim 1 with the characterizing features of claim 1.

Vorteile der ErfindungAdvantages of the invention

Durch die erfindungsgemäße Kombination einer Exzenterwelle mit einem Exzenterabschnitt und einer Exzenterhülse ist es möglich, den Hub der Exzenterhülse in Abhängigkeit der Drehrichtung der Exzenterwelle zu verändern. Dies ist darauf zurückzuführen, dass sich in einer ersten Drehrichtung der Exzenterwelle die Exzentrizität des Exzenterabschnittes und die Exzentrizität der Exzenterhülse addieren, während sie sich in der entgegengesetzten Drehrichtung subtrahieren. Dies bedeutet auch, dass sich die genannten Exzentrizitäten in einer Drehrichtung aufheben können, so dass sich eine Nullförderung des von der Exzenterwelle angetriebenen Pumpenelements einstellt. Bei dieser konstruktiven Auslegung hat der schaltbare Exzenterantrieb die Funktion eines einfachen Freilaufs, wobei er jedoch fertigungstechnisch sehr viel einfacher realisierbar ist als herkömmliche Freiläufe.The inventive combination of an eccentric shaft with an eccentric portion and an eccentric sleeve, it is possible to change the stroke of the eccentric sleeve in dependence on the direction of rotation of the eccentric shaft. This is due to the fact that in a first direction of rotation of the eccentric shaft, the eccentricity of the eccentric portion and the eccentricity of the eccentric sleeve add, while subtracting in the opposite direction of rotation. This also means that the aforementioned eccentricities can cancel out in one direction of rotation, so that a zero delivery of the driven by the eccentric shaft pump element adjusts itself. In this constructive design of the switchable eccentric has the function of a simple freewheel, but it is much easier to produce manufacturing technology than conventional freewheels.

Wenn die Exzentrizitäten des Exzenterabschnitts und der Exzenterhülse nicht gleich groß sind, ist es möglich, in einer ersten Drehrichtung einen ersten Förderhub einzustellen und durch Wechseln der Drehrichtung der Exzenterwelle den Förderhub zu verändern. Dadurch ist es möglich, bei gleicher Drehzahl der Exzenterwelle, unterschiedliche Fördermengen der von der Exzenterwelle angetriebenen Pumpenelemente zu realisieren. Im Ergebnis ist der schaltbare Exzenterantrieb somit zur Fördermengenregelung geeignet.If the eccentricities of the eccentric portion and the eccentric sleeve are not the same size, it is possible to set a first delivery stroke in a first direction of rotation and to change the delivery stroke by changing the direction of rotation of the eccentric shaft. This makes it possible, at the same speed of the eccentric shaft to realize different flow rates of driven by the eccentric shaft pump elements. As a result, the switchable eccentric drive is thus suitable for flow control.

Um zu gewährleisten, dass in beiden Drehrichtungen der Exzenterwelle die Exzenterhülse eine definierte Position relativ zum Exzenterabschnitt der Exzenterwelle einnimmt, sind erfindungsgemäß Anschlagmittel vorgesehen, welche die Drehung der Exzenterhülse relativ zu dem Exzenterabschnitt begrenzen.In order to ensure that in both directions of rotation of the eccentric shaft, the eccentric sleeve occupies a defined position relative to the eccentric portion of the eccentric shaft, stop means according to the invention are provided, which limit the rotation of the eccentric sleeve relative to the eccentric portion.

Vorteilhafterweise können die Anschlagmittel einen Stift und eine mit dem Stift zusammenwirkende kreisbogenförmige Nut oder einen mit dem Stift zusammenwirkenden Absatz umfassen.Advantageously, the stop means may comprise a pin and a circular arc-shaped groove cooperating with the pin or a shoulder cooperating with the pin.

Dadurch ist es auf einfachste Weise erreichbar, dass die Exzenterhülse in einer ersten Position relativ zum Exzenterabschnitt von dem Exzenterabschnitt mitgenommen wird, wenn die Exzenterwelle in eine erste Drehrichtung angetrieben wird.This makes it possible in the simplest way that the eccentric sleeve is taken in a first position relative to the eccentric portion of the eccentric portion when the eccentric shaft is driven in a first direction of rotation.

Des Weiteren kann dadurch auf einfachste Weise erreicht werden, dass die Exzenterhülse eine zweite Position relativ zum Exzenterabschnitt einnimmt, wenn die Exzenterwelle in entgegengesetzter Richtung angetrieben wird.Furthermore, this can be achieved in the simplest way that the eccentric sleeve assumes a second position relative to the eccentric portion when the eccentric shaft is driven in the opposite direction.

Alternativ ist es selbstverständlich auch möglich, dass die Anschlagmittel eine Klaue, wie sie von einer Klauenkupplung bekannt ist, umfassen, die mit einer kreisbogenförmigen Nut oder einem Absatz zusammenwirkt.Alternatively, it is of course also possible that the stop means comprise a claw, as it is known from a dog clutch, which cooperates with a circular arc-shaped groove or a shoulder.

Dabei ist erfindungsgemäß möglich, den Stift oder die Klaue an der Exzenterwelle zu befestigen und die kreisbogenförmige Nut in der Exzenterhülse vorzusehen. Ebenso ist es möglich, die kreisbogenförmige Nut oder den Absatz in der Exzenterwelle vorzusehen und den Stift oder die Klaue an der Exzenterhülse anzuordnen.It is inventively possible to attach the pin or the claw to the eccentric shaft and provide the circular arc-shaped groove in the eccentric sleeve. It is also possible to provide the circular arc-shaped groove or the shoulder in the eccentric shaft and to arrange the pin or the claw on the eccentric sleeve.

Je nach Anwendungsfall kann es vorteilhaft sein, dass die Exzentrizität des Exzenterabschnitts gleich groß wie die Exzentrizität der Exzenterhülse ist. Alternativ ist es aber auch möglich, dass die Exzentriztät des Exzenterabschnitts kleiner oder größer als die Exzentrizität der Exzenterhülse ist.Depending on the application, it may be advantageous that the eccentricity of the eccentric portion is equal to the eccentricity of the eccentric sleeve. Alternatively, it is also possible that the eccentricity of the eccentric portion is smaller or larger than the eccentricity of the eccentric sleeve.

Der erfindungsgemäße schaltbare Exzenterantrieb ist besonders geeignet, zur Erzeugung einer oszillierenden Bewegung, insbesondere zum Antrieb einer Radialkolbenpumpe.The switchable eccentric drive according to the invention is particularly suitable for generating an oscillating movement, in particular for driving a radial piston pump.

Des Weiteren ist es erfindungsgemäß möglich, dass die Exzenterwelle mit einem weiteren Verbraucher, insbesondere einem Rührflügel eines Rührwerks, gekoppelt ist. Dadurch ist es möglich, bei Antrieb der Exzenterwelle in einer ersten Drehrichtung sowohl den Rührflügel als auch die Radialkolbenpumpe anzutreiben und bei Änderung,der Drehrichtung der Exzenterwelle nur den Rührflügel anzutreiben bei gleichzeitiger Nullförderung der Radialkolbenpumpe. Dies kann erfindungsgemäß ohne schaltbare Kupplung zwischen Exzenterwelle und Radialkolbenpumpe erfolgen, was erhebliche Vorteile bezüglich Fertigungs- und Montageaufwand sowie Herstellungskosten mit sich bringt.Furthermore, it is possible according to the invention that the eccentric shaft is coupled to a further consumer, in particular a stirring blade of an agitator. This makes it possible, when driving the eccentric shaft in a first direction of rotation to drive both the impeller and the radial piston pump and to drive when changing the direction of rotation of the eccentric shaft only the impeller while zero promotion of the radial piston pump. This can be done according to the invention without switchable coupling between eccentric shaft and radial piston pump, which brings significant advantages in terms of manufacturing and assembly costs and manufacturing costs.

Bei einer Nullförderung der Radialkolbenpumpe kann der Rührflügel dafür sorgen, dass die Homogenität eines Schmierstoffs, der von der Radialkolbenpumpe bei Bedarf gefördert wird, erhalten-bleibt.With a zero promotion of the radial piston pump of the impeller can ensure that the homogeneity of a lubricant that is promoted by the radial piston pump when needed, is maintained.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibung und den Patentansprüchen entnehmbar. Alle in der Zeichnung, deren Beschreibung und den Patentansprüchen beschriebenen Merkmale können sowohl einzeln als auch in beliebiger Kombination miteinander erfindungswesentlich sein.Further advantages and advantageous embodiments of the invention are the following drawings, the description and the claims removable. All features described in the drawing, the description and the claims may be essential to the invention both individually and in any combination.

Zeichnungdrawing

Es zeigen:

Figur 1
eine Seitenansicht eines erfindungsgemäßen schaltbaren Exzenterantriebs,
Figuren 2 und 3
Schnitte entlang der Linie A-A durch den schaltbaren Exzenterantrieb und
Figur 4
ein Ausführungsbeispiel eines erfindungsgemäßen schaltbaren Exzenterantriebs, bei dem eine Radialkolbenpumpe mit mehreren Pumpenelementen und ein Rührwerk von der Exzenterwelle angetrieben werden.
Show it:
FIG. 1
a side view of a switchable eccentric drive according to the invention,
FIGS. 2 and 3
Cuts along the line AA through the switchable eccentric and
FIG. 4
An embodiment of a switchable eccentric drive according to the invention, in which a radial piston pump with a plurality of pump elements and a stirrer are driven by the eccentric shaft.

Beschreibung der AusführungsbeispieleDescription of the embodiments

In Figur 1 ist ein Längsschnitt durch ein Gehäuse 1, das beispielsweise ein Pumpengehäuse einer Radialkolbenpumpe sein kann, dargestellt. In dem Gehäuse 1 ist eine Exzenterwelle 3 drehbar gelagert. Eine Drehachse der Exzenterwelle 3 ist in Figur 1 mit dem Bezugszeichen 5 versehen. Die Exzenterwelle 3 weist einen Exzenterabschnitt 7 auf. Die Exzentrizität des Exzenterabschnitts 7 bezüglich der Drehachse 5 ist in Figur 1 mit e1 bezeichnet. An dem Exzenterabschnitt 7 der Exzenterwelle 3 ist eine Exzenterhülse 9 drehbar gelagert.In FIG. 1 is a longitudinal section through a housing 1, which may be, for example, a pump housing of a radial piston pump shown. In the housing 1, an eccentric shaft 3 is rotatably mounted. An axis of rotation of the eccentric shaft 3 is in FIG. 1 provided with the reference numeral 5. The eccentric shaft 3 has an eccentric section 7. The eccentricity of the eccentric 7 with respect to the axis of rotation 5 is in FIG. 1 denoted by e 1 . At the eccentric portion 7 of the eccentric shaft 3, an eccentric sleeve 9 is rotatably mounted.

Die Exzenterhülse 9 hat eine kreisförmige Außenkontur, wie sich beispielsweise aus den Figuren 2 und 3 ergibt. Exzentrisch zu einer Mittelachse 11 der Exzenterhülse 9 ist eine Bohrung 13 in der Exzenterhülse 9 vorhanden. Die Bohrung 13 hat den gleichen Durchmesser wie der Exzenterabschnitt 7 der Exzenterwelle 3 und dient als Lagerung der Exzenterhülse 9 auf dem Exzenterabschnitt 7. Die Exzentrizität der Bohrung 13 bezüglich der Mittelachse 11 der Exzenterhülse 9 ist in Figur 1 mit ez bezeichnet. In Exzentrizität e1 des Exzenterabschnitts 7 und die Exzentrizität e2 der Exzenterhülse 9.The eccentric sleeve 9 has a circular outer contour, as can be seen for example from the Figures 2 and 3 results. Eccentrically to a central axis 11 of the eccentric sleeve 9, a bore 13 in the eccentric sleeve 9 is present. The bore 13 has the same diameter as the eccentric portion 7 of the eccentric shaft 3 and serves as a bearing of the eccentric sleeve 9 on the eccentric 7. The eccentricity of the bore 13 with respect to the central axis 11 of the eccentric sleeve 9 is in FIG. 1 denoted by ez. In Eccentricity e 1 of the eccentric 7 and the eccentricity e 2 of the eccentric sleeve. 9

In der Exzenterwelle 3 ist ein Stift 15 vorgesehen, der in eine kreisbogenförmige Nut 17 in der Exzenterhülse 9 eingreift. Die Nut 17 verläuft konzentrisch zu der Bohrung 13 in der Exzenterhülse 9 und umfasst einen Winkel von etwa 180°. Die Nut 17 und der Stift 15 haben die Funktion einer Drehwinkelbegrenzung und eines Anschlags. Sie sorgen dafür, dass die Exzenterhülse 9 nur um einen bestimmten Winkel relativ zu dem Exzenterabschnitt 7 drehbar ist. Des Weiteren kann mit Hilfe des Stifts 15 und der Nut 17 ein Drehmoment zwischen Exzenterwelle 3 und Exzenterhülse 9 übertragen werden.In the eccentric shaft 3, a pin 15 is provided, which engages in an arcuate groove 17 in the eccentric sleeve 9. The groove 17 extends concentrically to the bore 13 in the eccentric sleeve 9 and comprises an angle of about 180 °. The groove 17 and the pin 15 have the function of a rotation angle limit and a stop. They ensure that the eccentric sleeve 9 is rotatable only by a certain angle relative to the eccentric portion 7. Furthermore, with the aid of the pin 15 and the groove 17, a torque between the eccentric shaft 3 and the eccentric sleeve 9 can be transmitted.

Sobald nämlich das Ende der Nut 17 in Anlage an den Stift 15 gelangt, wird die Relativbewegung zwischen der Exzenterwelle 3 und der Exzenterhülse 9 beendet und es wird Drehmoment von der Exzenterwelle 3 auf die Exzenterhülse 9 übertragen.As soon as the end of the groove 17 comes into contact with the pin 15, the relative movement between the eccentric shaft 3 and the eccentric sleeve 9 is terminated and it is transmitted torque from the eccentric shaft 3 on the eccentric sleeve 9.

Wenn nun beispielsweise ein Kolben 19 einer Radialkolbenpumpe am Außendurchmesser der Exzenterhülse 9 aufliegt und durch eine nicht dargestellte Feder in Anlage an der Exzenterhülse 9 gehalten wird, kann der Kolben 19 einer Radialkolbenpumpe durch Drehen der Exzenterwelle 3 in eine oszillierende Bewegung versetzt werden.If, for example, a piston 19 of a radial piston pump rests on the outer diameter of the eccentric sleeve 9 and is held by a spring, not shown, in contact with the eccentric sleeve 9, the piston 19 of a radial piston pump can be set by rotating the eccentric shaft 3 in an oscillating motion.

In Figur 2 ist ein Schnitt entlang der Linie A-A gemäß Figur 1 dargestellt, wobei die Exzenterwelle 3 entgegen dem Uhrzeigersinn gedreht wird. In dieser Darstellung ist die kreisbogenförmige Nut 17 gut sichtbar. Bei der in Figur 2 durch einen Pfeil 21 dargestellten Drehrichtung arretiert der Stift 15 die Exzenterhülse 9 relativ zur Exzenterwelle 3 in der in Figur 2 dargestellten Position. Gleichzeitig wird das Antriebsdrehmoment von der Exzenterwelle 3 auf die Exzenterhülse 9 übertragen.In FIG. 2 is a section along the line AA according to FIG. 1 shown, wherein the eccentric shaft 3 is rotated counterclockwise. In this illustration, the circular arc-shaped groove 17 is clearly visible. At the in FIG. 2 By a direction shown by an arrow 21, the pin 15 locks the eccentric sleeve 9 relative to the eccentric shaft 3 in the in FIG. 2 position shown. simultaneously the drive torque is transmitted from the eccentric shaft 3 to the eccentric sleeve 9.

Bei jeder Umdrehung der Exzenterwelle 3 führt der Kolben 19 eine oszillierende Bewegung, die durch einen Doppelpfeil 23 angedeutet ist, aus. Dabei beträgt der Hub H des Kolbens 19 (H = 2 x (e1 + e2)).With each revolution of the eccentric shaft 3, the piston 19 performs an oscillating movement, which is indicated by a double arrow 23 from. In this case, the stroke H of the piston 19 (H = 2 x (e 1 + e 2 )).

Bei dem in Figur 1 und 2 dargestellten Ausführungsbeispiel ist die Exzentrizität e1 des Exzenterabschnitts 9 gleich groß wie die Exzentrizität e2 der Exzenterhülse 9. Dies muss jedoch nicht immer so sein.At the in FIGS. 1 and 2 illustrated embodiment, the eccentricity e 1 of the eccentric portion 9 is the same size as the eccentricity e 2 of the eccentric sleeve 9. However, this need not always be so.

Wenn die Drehrichtung der Exzenterwelle umgedreht wird, wie dies in Figur 3 dargestellt ist, wandert der Stift 15 an das entgegengesetzte Ende der Nut 17. Infolgedessen dreht sich die Exzenterhülse 9 um 180° relativ zu der Exzenterwelle 3 mit dem Ergebnis, dass sich die Exzentrizität e1 des Exzenzterabschnitts 7 und die Exzentrizität e2 der Exzenterhülse 9 subtrahieren. Somit beträgt der Hub H des Kolbens 19 bei Drehrichtung der Exzenterwelle 3 im Uhrzeigersinn (H = 2 x (e1 - e2)).When the direction of rotation of the eccentric shaft is reversed, as in FIG. 3 As a result, the eccentric sleeve 9 rotates by 180 ° relative to the eccentric shaft 3 with the result that the eccentricity e 1 of the Exzenzterabschnitts 7 and the eccentricity e 2 of the eccentric sleeve. 9 subtract. Thus, the stroke H of the piston 19 in the direction of rotation of the eccentric shaft 3 in the clockwise direction (H = 2 x (e 1 - e 2 )).

Weil bei dem in den Figuren 1 bis 3 dargestellten Ausführungsbeispiel e1 = e2 ist, ist die Exzenterhülse 9 in der in Figur 3 dargestellten Stellung konzentrisch zu der Drehachse 5 der Exzenterwelle 3, so dass keine Exzentrizität an der Kontaktfläche zwischen Exzenterhülse 9 und Kolben 19 auftritt. In Folge dessen ist der Hub H = 0 und infolgedessen führt der Kolben 19 trotz einer Drehung der Exzenterwelle 3 keine oszillierende Bewegung aus.Because when in the FIGS. 1 to 3 illustrated embodiment e 1 = e 2 , the eccentric sleeve 9 in the in FIG. 3 shown position concentric with the axis of rotation 5 of the eccentric shaft 3, so that no eccentricity on the contact surface between eccentric sleeve 9 and piston 19 occurs. As a result, the stroke H = 0, and as a result, the piston 19 performs no rotation despite the rotation of the eccentric shaft 3 from.

Mit anderen Worten: In der in Figur 3 dargestellten Position der Exzenterhülse 9 relativ zur Exzenterwelle 3 fallen die Drehachse 5 der Exzenterwelle 3 und die Mittelachse 11 der Exzenterhülse 9 zusammen.In other words: in the in FIG. 3 shown position of the eccentric sleeve 9 relative to the eccentric shaft 3rd fall the axis of rotation 5 of the eccentric shaft 3 and the central axis 11 of the eccentric sleeve 9 together.

Bei dieser konstruktiven Ausgestaltung des erfindungsgemäßen Exzenterantriebs ist dessen Funktion mit der eines Freilaufs vergleichbar.In this structural embodiment of the eccentric drive according to the invention whose function is comparable to that of a freewheel.

Es versteht sich von selbst, dass es auch möglich ist, die Exzentrizitäten e1 und e2 voneinander verschieden zu machen, so dass in Abhängigkeit der Drehrichtung-der Exzenterwelle zwei verschieden große Hübe H des Kolbens 19 erreicht werden. Im einen Fall gilt dann für den Hub H des Kolbens 19 H = 2 x (e1+e2), während bei der anderen Drehrichtung gilt H = 2 x (e1-e2). Diese konstruktive Ausgestaltung kann dazu genutzt werden, um die Fördermenge der Radialkolbenpumpe bei konstanter Drehzahl durch Umkehren der Drehrichtung der Exzenterwelle 3 zu verändern.It goes without saying that it is also possible to make the eccentricities e 1 and e 2 different from one another, so that two different strokes H of the piston 19 are achieved depending on the direction of rotation of the eccentric shaft. In one case, H = 2 x (e 1 + e 2 ) applies to the stroke H of the piston 19, while in the other direction of rotation H = 2 x (e 1 -e 2 ). This structural design can be used to change the flow rate of the radial piston pump at a constant speed by reversing the direction of rotation of the eccentric shaft 3.

In Figur 4 ist ein Anwendungsbeispiel eines erfindungsgemäßen schaltbaren Exzenterantriebs dargestellt. Über einen Getriebemotor 25 wird die in dem Pumpengehäuse 1 drehbar gelagerte Exzenterwelle 3 angetrieben. An dem Exzenterabschnitt 7 der Exzenterwelle 3 ist, wie anhand der Figuren 1 bis 3 ausführlich erläutert, eine Exzenterhülse 9 vorgesehen. Die Exzenterhülse 9 treibt die Kolben (nicht dargestellt) von zwei gegenüberliegend angeordneten Pumpenelementen 27 an. In der Verlängerung des Exzenterabschnitts 7 ist eine Kappe 28 vorhanden, die einerseits dazu dient, die Exzenterhülse 9 in axialer Richtung zu fixieren und andererseits einen Rührflügel 29 eines in seiner Gesamtheit mit dem Bezugszeichen 31 bezeichneten Rührwerks anzutreiben. Es versteht sich von selbst, dass die Kappe 28 koaxial zur Drehachse 5 der Exzenterwelle angeordnet ist, so dass der oder die Rührflügel 29 eine Kreisbahn beschreiben, die konzentrisch zur Drehachse 5 verläuft.In FIG. 4 an application example of a switchable eccentric drive according to the invention is shown. About a geared motor 25, the rotatably mounted in the pump housing 1 eccentric shaft 3 is driven. At the eccentric portion 7 of the eccentric shaft 3, as shown in the FIGS. 1 to 3 explained in detail, an eccentric sleeve 9 is provided. The eccentric sleeve 9 drives the pistons (not shown) of two oppositely arranged pump elements 27. In the extension of the eccentric 7 a cap 28 is provided, which serves on the one hand to fix the eccentric sleeve 9 in the axial direction and on the other hand to drive an agitator 29 of a designated in its entirety by the reference numeral 31 agitator. It goes without saying that the cap 28 is arranged coaxially to the axis of rotation 5 of the eccentric shaft, so that the or Impeller 29 describe a circular path which is concentric with the axis of rotation 5.

Diese Anordnung ist insbesondere dann vorteilhaft, wenn in bestimmten Betriebszuständen von Schmiereinrichtungen das in dem Rührwerk 31 befindliche Medium gerührt werden soll, beispielsweise um Lufteinschlüsse aus dem Fördermedium herauszuführen, ohne dass gleichzeitig die Pumpenelemente 27 fördern. Manchmal soll mit dem Rührflügel 29 das in dem Rührwerk 31 befindliche Medium homogenisiert werden, ohne dass die Pumpenelemente 27 der Radialkolbenpumpe fördern.This arrangement is particularly advantageous if in certain operating conditions of lubricating the medium contained in the agitator 31 is to be stirred, for example, to lead out air bubbles from the fluid, without at the same time promote the pump elements 27. Sometimes, with the agitator blade 29, the medium contained in the agitator 31 should be homogenized without the pump elements 27 promoting the radial piston pump.

Wenn eine Förderung der Pumpenelemente 27 gewünscht wird, wird die Drehrichtung der Exzenterwelle 3 beziehungsweise des Getriebemotors 25 umgedreht, so dass sich die Exzentrizitäten e1 und e2 addieren und die Förderung der Pumpenelemente 27 gemäß beginnt, wie dies anhand der Figur 2 ausführlich erläutert wurde. Gleichzeitig werden auch mit dem Antrieb der Pumpenelemente 27 die Rührflügel 29 angetrieben, so dass auch in diesem Betriebszustand ein Umrühren des im Rührwerk 31 befindlichen Fördermediums gewährleistet ist. Falls gewünscht, können die Rührflügel 29 so ausgestaltet werden, dass sie eine Rührwirkung haben, die drehrichtungsabhängig ist.If a promotion of the pump elements 27 is desired, the direction of rotation of the eccentric shaft 3 and the geared motor 25 is reversed, so that the eccentricities e 1 and e 2 add and the promotion of the pump elements 27 begins according to, as shown in FIG FIG. 2 was explained in detail. At the same time, the impellers 29 are also driven by the drive of the pump elements 27, so that even in this operating state stirring of the conveying medium located in the agitator 31 is ensured. If desired, the impellers 29 may be configured to have a stirring action that is rotational direction dependent.

Claims (14)

  1. Switchable eccentric drive, comprising an eccentric shaft (3), the eccentric shaft (3) having an eccentric portion (7) which is arranged so as to be eccentric to an axis of rotation (5) of the eccentric shaft (3), an eccentric sleeve (9) being rotatably mounted on the eccentric portion (7) and the eccentric sleeve (9) being rotatable relative to the eccentric portion (7) through an angle less than or equal to 180°, and comprising attachment means (15, 17), which delimit the rotation of the eccentric sleeve (9) relative to the eccentric portion (7), characterised in that the travel of the eccentric sleeve (9) is altered depending on the direction of rotation of the eccentric shaft (3).
  2. Switchable eccentric drive according to claim 1, characterised in that the attachment means comprise at least one pin (15) and at least one arc-shaped groove (17) which cooperates with the pin (15) or a crank which cooperates with the pin (15).
  3. Switchable eccentric drive according to claim 2, characterised in that the attachment means comprise at least one claw and at least one arc-shaped groove (17) which cooperates with the claw or a crank with cooperates with the claw.
  4. Switchable eccentric drive according to either claim 2 or claim 3, characterised in that the pin (15) or the claw is fastened to the eccentric shaft (3), and in that the groove (17) or the crank is provided in the eccentric sleeve (9).
  5. Switchable eccentric drive according to either claim 2 or claim 3, characterised in that the groove (17) or the crank is provided in the eccentric shaft (3), and in that the pin (15) or the claw is fastened in or on the eccentric sleeve (9).
  6. Switchable eccentric drive according to any one of the preceding claims, characterised in that the eccentricity (e1) of the eccentric portion (7) is equal to the eccentricity (e2) of the eccentric sleeve (9).
  7. Switchable eccentric drive according to any one of claims 1 to 5, characterised in that the eccentricity (e1) of the eccentric portion (7) is less than or greater than the eccentricity (e2) of the eccentric sleeve (9).
  8. Switchable eccentric drive according to any one of the preceding claims, characterised in that the eccentricity (e1) of the eccentric portion (7) and the eccentricity (e2) of the eccentric sleeve (9) are partially or completely added when the eccentric shaft (3) turns in a first direction of rotation.
  9. Switchable eccentric drive according to any one of claims 1 to 7, characterised in that the eccentricity (e1) of the eccentric portion (7) and the eccentricity (e2) of the eccentric sleeve (9) are partially or completely subtracted when the eccentric shaft (3) turns in a second direction of rotation.
  10. Switchable eccentric drive according to any one of the preceding claims, characterised in that the eccentricity (e1) of the eccentric portion (7) and the eccentricity (e2) of the eccentric sleeve (9) serve to create an oscillating movement, in particular for driving a piston pump.
  11. Switchable eccentric drive according to any one of the preceding claims, characterised in that the eccentric shaft (3) is coupled to a further consumer load, in particular a stirring blade (29) in a stirring device (31).
  12. Radial piston pump comprising at least one pump element (27), characterised in that the at least one pump element (27) is driven by a switchable eccentric drive according to any one of the preceding claims.
  13. Radial piston pump according to claim 12, characterised in that a stirring blade (29) of a stirring device (31) is provided, and in that the stirring blade (29) is rigidly coupled to the eccentric shaft (31).
  14. Radial piston pump according to either claim 12 or claim 13, characterised in that the eccentric shaft (3) is driven by a motor, preferably by an electric motor and particularly preferably by a geared motor (25).
EP06020696A 2005-10-11 2006-10-02 Switchable eccentric drive and stirring device with switchable radial piston pump Active EP1775467B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005048567A DE102005048567B3 (en) 2005-10-11 2005-10-11 Switchable eccentric device, e.g. for radial piston pump, has stop arrangement that limits rotation of eccentric sleeve relative to eccentric section

Publications (2)

Publication Number Publication Date
EP1775467A1 EP1775467A1 (en) 2007-04-18
EP1775467B1 true EP1775467B1 (en) 2008-10-01

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Application Number Title Priority Date Filing Date
EP06020696A Active EP1775467B1 (en) 2005-10-11 2006-10-02 Switchable eccentric drive and stirring device with switchable radial piston pump

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EP (1) EP1775467B1 (en)
AT (1) ATE409808T1 (en)
DE (2) DE102005048567B3 (en)
ES (1) ES2315981T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007045844A1 (en) 2007-09-26 2009-04-02 Eugen Woerner Gmbh & Co. Kg Radial piston pump has pump element, which is driven by external drive, where external drive has eccentric shaft, which has eccentric section arranged eccentric to rotation axis of eccentric shaft
DE102009046405A1 (en) * 2009-11-04 2011-05-05 Continental Teves Ag & Co. Ohg Piston pump for slip-controlled hydraulic brake system of motor vehicle, has end stop arranged between inner and outer cams, where pump capacity is varied based on direction of rotation of end stop
DE102010043886A1 (en) * 2010-11-15 2012-05-16 Continental Teves Ag & Co. Ohg Piston pump for conveying pressure fluid in hydraulic brake system, has one pump piston independently rendered stationary by actuation of other pump pistons for reducing pressure fluid delivery, and for switching one of eccentric cams
CN102182665B (en) * 2011-05-26 2013-01-02 北京康斯特仪表科技股份有限公司 High-pressure bidirectional miniature power-driven air pump
DE102011087221B4 (en) 2011-11-28 2014-05-28 Eugen Woerner Gmbh & Co. Kg Switchable pressure relief of a lubrication device with piston pump

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH204332A (en) * 1937-12-23 1939-04-30 Lanfranconi Domenico Piston pump with delivery rate dependent on the delivery pressure and adjustable final pressure.
US4022082A (en) * 1974-10-13 1977-05-10 Kobe Steel Ltd. Driving apparatus for oscillation of a mold within a continuous casting machine
CA1103960A (en) * 1977-11-23 1981-06-30 William J. Glazier Variable throw eccentric
FR2503274B1 (en) * 1981-04-02 1988-03-11 Evrard Ets ADJUSTABLE STROKE RECIPROCATING PUMP, PARTICULARLY FOR AGRICULTURAL SPRAYING
DE3623596A1 (en) * 1986-07-12 1988-02-04 Kromschroeder Ag G SHAFT, ESPECIALLY FOR BELLOW GAS METERS
DE4122486A1 (en) * 1991-07-06 1993-01-07 Teves Gmbh Alfred DRIVE UNIT, ESPECIALLY MOTOR-PUMP UNIT FOR SLIP-CONTROLLED BRAKE SYSTEMS
DE19650274A1 (en) * 1996-12-04 1998-06-10 Teves Gmbh Alfred Pump assembly for motor driven radial or series piston pump

Also Published As

Publication number Publication date
EP1775467A1 (en) 2007-04-18
DE502006001661D1 (en) 2008-11-13
ES2315981T3 (en) 2009-04-01
ATE409808T1 (en) 2008-10-15
DE102005048567B3 (en) 2007-04-12

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