EP0430099A1 - Radial pistons pump, in particular for hydraulic system and pressurizing element therefor - Google Patents

Radial pistons pump, in particular for hydraulic system and pressurizing element therefor Download PDF

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Publication number
EP0430099A1
EP0430099A1 EP90122409A EP90122409A EP0430099A1 EP 0430099 A1 EP0430099 A1 EP 0430099A1 EP 90122409 A EP90122409 A EP 90122409A EP 90122409 A EP90122409 A EP 90122409A EP 0430099 A1 EP0430099 A1 EP 0430099A1
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EP
European Patent Office
Prior art keywords
piston
pressure generating
generating element
pressure
radial
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Granted
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EP90122409A
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German (de)
French (fr)
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EP0430099B1 (en
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Bernd Dämmrich
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Individual
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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
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • 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
    • F04B1/0404—Details or component parts
    • F04B1/0439—Supporting or guiding means for the pistons

Definitions

  • the present invention relates to radial piston pumps, in particular for hydraulic systems, and a pressure generating element therefor.
  • radial piston pumps as are known for example from DE-OS 35 00 432, DE-OS 34 24 862, DE-OS 30 39 197 and DE-GM 85 04 213, a plurality of cylindrical pressure generating elements with piston receiving part and sliding therein the piston is screwed radially to a drive shaft with an eccentric in a common pump housing.
  • the pressure generating elements or more precisely the piston receiving parts of the pressure generating elements have a cuboid shape and are screwed onto carrier elements or onto the pump housing.
  • the design of the pressure generating elements as separate components that are detachable from the radial piston pump as a whole allows the flexible adaptation of one and the same pump body to different requirements with regard to the media to be conveyed, the pressures to be generated, etc.
  • radial piston pumps such as those described in DE-PS 923 589 are known, however, there is the disadvantage that there is a risk of deforming the piston bore in the piston receiving part by screwing the cuboid piston receiving part onto the pump housing or onto a carrier part. Since radial piston pumps are also operated at speeds of up to 3000 revolutions per minute and more, this can easily lead to the destruction of the pressure generating elements.
  • the sensible arrangement of the valves presents difficulties, since valves or suction and pressure connections can be arranged only with great difficulty transversely to the screwing direction.
  • the pressure element By providing a receiving opening in the pump housing or in a part connected to the pump housing and running axially to the drive shaft, it is possible to install the pressure element in a form-fitting manner in the radial piston pump.
  • the radial forces exerted by the eccentric are thus transmitted positively and no longer only frictionally to the component carrying the receiving opening.
  • the component supporting the receiving opening can be designed according to different requirements, such as mechanical strength, vibration and sound absorption behavior, corrosion resistance, specific weight, etc.
  • the component carrying the receiving opening can simultaneously take over the function of the piston head. Due to the axial arrangement of the pressure generating element in the component carrying the receiving opening, the pressure and suction connections or pressure and suction valves can be arranged almost anywhere in or on the pressure generating element.
  • the receiving opening and / or the pressure generating element or piston receiving part inserted into the receiving opening is symmetrical, in particular point symmetrical, with respect to the axial installation direction.
  • the receiving opening can thus be designed in the form of a bore with a constant cross section. This simplifies the manufacture of the radial piston pump according to the invention.
  • the receiving opening and / or the outside of the pressure generating element or the piston receiving part is profiled.
  • this profiling can have a favorable influence on the noise emission and, on the other hand, the piston receiving part can be locked in a simple manner tangential to the drive shaft.
  • the locking of the pressure generating element or the piston receiving part in the component carrying the receiving opening can additionally or alternatively by a fastening means, e.g. in the form of a pin.
  • the size of the pressure generating element, in particular the piston receiving part, can be reduced.
  • a particularly suitable pressure generating element is provided. Because the piston receiving part is arranged transversely to the direction of movement of the piston, an axial installation of the pressure generating element in a radial piston pump is possible.
  • FIGs 1, 2, 3 and 4 show a first embodiment of the radial piston pump according to the invention the pressure generating element.
  • the radial piston pump has a drive shaft 2 which is mounted in a pressure plate 4 and a flange plate 6.
  • An annular or cylindrical pump housing 8 extends between the pressure plate 4 and the flange plate 6, in the wall of which the receiving openings 10 are in the form of bores.
  • Pressure generating elements 12 with piston receiving part 14, piston 16, piston bore 18 and suction channel 20 and pressure channel 22 are installed in the receiving openings.
  • Pressure plate 4, flange plate 6 and pump housing 8 enclose a piston drive chamber 7 from which the fluid to be compressed is sucked in via the suction channel 20.
  • the piston 16 is moved during the pressure stroke by an eccentric 24 fastened on the drive shaft 2; up in the drawing.
  • the piston 16 is hollow and, together with the piston bore 18, forms a compression space 17.
  • the piston 16 can be sealed against the piston bore 18 with a seal, not shown, which surrounds the piston 16 in a ring.
  • the piston 16 is moved by a piston spring 26 - downward in the drawing - which is arranged in the interior of the piston 16 and is supported in the piston 16 itself and in the piston receiving part 14 at the bottom of the piston bore 18.
  • the suction channel 20 is integrated in the piston 16, while the pressure connection is provided laterally in the piston receiving part 14 in contact with the pressure plate 4.
  • a suction valve 30 or a pressure valve 32 is arranged in the form of ball valves.
  • the suction valve 30 consists of a ball 34 which is pressed by a suction valve spring 36 against a suction valve seat 38 inside the piston 16 and seals the suction channel 20 against the piston drive chamber 7 during the pressure stroke.
  • the suction valve spring 36 is supported on the bottom of the piston bore 18 on the piston receiving part 14 and on the ball 34.
  • the pressure channel 22 connects the compression space 17 to a pressure connection line 40 accommodated in the pressure plate 4.
  • the pressure valve 32 is accommodated with a pressure valve spring 42, a ball 44 and a ball stop 46.
  • the pressure channel 22 is sealed off from the pressure plate 4 by a seal 48.
  • the piston 16 Due to the rotary movement of the drive shaft 2, the piston 16 is periodically pushed into the piston receiving part 14 by the eccentric 24 - pressure stroke - and periodically pushed out of the piston receiving part 14 again by the piston spring 26 to the lower reversal point.
  • the ball 34 is lifted off the ball seat against the suction valve spring 36 and the fluid can flow through the T-shaped suction channel 20 into the compression space 17 into the piston bore 18.
  • the pressure channel 22 is closed off by the ball 44 loaded by the pressure valve spring 42.
  • the piston 16 If, during the pressure stroke, the piston 16 is moved into the upper reversal point by the eccentric 24, the suction valve spring 36 and the higher pressure which builds up pushes the ball 34 onto the suction valve seat 38 and the ball 44 is pressed against the pressure valve spring 42 due to the high pressure building up lifted from their seat.
  • the ball stop 46 limits the possible path of the ball 44 in the fluid flowing into the pressure channel 22.
  • the suction valve 30 is arranged at the end of the T-shaped suction channel 20 in the interior of the piston 16.
  • the suction valve 30 can, however, not only be accommodated in the piston, but almost anywhere in the pressure generating element. Examples of this are shown in the pressure generating elements 60 and 70 according to FIGS. 6 and 7.
  • the embodiment of the pressure generating element 60 according to FIG. 6 has a suction channel 62 which is arranged in parallel next to the piston bore 18.
  • the suction channel 62 opens next to the piston bore 18 in the piston drive chamber 17, so that the fluid to be compressed can be sucked out of the piston drive chamber 17.
  • a suction valve 66 is arranged immediately behind the mouth of the suction channel 62 in the piston drive chamber 17.
  • the suction valve 66 differs from the suction valve 30 only in the configuration of the suction valve spring.
  • the suction valve 66 has a suction valve spring 68 which is supported on a shoulder 69 and not on the bottom of the piston bore 18, as is the case with the suction valve spring 36 of the above-described embodiments.
  • the suction channel 62 opens into the pressure channel 22 in the the pressure valve 32 is housed.
  • the design and function of the pressure valve 32 and the other components completely match the design and function of the embodiments according to FIGS. 1 to 5, so that a detailed description is unnecessary.
  • FIG. 7 shows a further embodiment of a pressure generating element 70.
  • the pressure generating element 70 has a suction channel 72, which does not open into the piston drive chamber, but rather into a suction feed line 74 accommodated in the flange plate 6. Suction channel 72 or suction feed line 74 are sealed by a seal 76 .
  • the suction valve 78 accommodated in the suction channel 72 corresponds completely to the suction valve 66 of the pressure generating element 60.
  • the embodiment according to FIG. 7 is particularly advantageous in the case of fluids to be compressed which, owing to their chemical (for example corrosive), physical (for example temperature) and / or biological (for example bacteriologically contaminated) properties, are to be carried out separately from the other parts of the radial piston pump .
  • FIG. 8 shows a design of a piston 80 that is particularly suitable for the delivery of such fluids.
  • a piston spring 82 surrounds the piston 80 in the region that protrudes from the piston bore.
  • the piston spring 82 is supported on the edge of the piston bore 18 and on a shoulder 84.
  • the embodiment of the piston according to FIG. 8 is not limited to the conveyance of corrosive media.
  • FIG. 9 shows a special embodiment of a piston 90.
  • the piston 90 consists of a piston part 91 and a sliding washer 92.
  • the separation of the piston 90 in the piston part 91 and the sliding washer 92 makes it possible to reduce transverse forces which can occur due to manufacturing tolerances.
  • Through a more or less central bore 94 in the piston part or 95 in the sliding washer 92 there is a hydrostatic one Relief of the piston 90 possible.
  • this type of hydrostatic relief is only possible if the suction channel is not inside the piston.
  • the embodiment of the piston 90 is therefore particularly suitable for the pressure generating element 60 shown in FIG. 6.
  • the piston 100 shown in FIG. 10 shows a possibility for a hydrostatic relief.
  • a relief bore 104 is placed in the direction of movement of the piston so that it does not pass through a transverse T-shaped suction channel 102.
  • the relief bore 104 is shown in FIG. 10 offset by 90 ° for reasons of drawing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Radial piston pumps in hydraulic systems are usually flange-mounted on a pump housing (8) or a supporting part. As a result deformations can easily occur, which under some circumstances lead to destruction of the pump. The new radial piston pump and the associated pressure generating element (12) are intended to prevent such deformations. By providing a receiver hole (10) in the pump housing (8) or in a part connected to the pump housing, which runs axially to the drive shaft (2), it is possible to fit the pressure element (12) so that it positively interlocks in the radial piston pump. The radial forces exerted by the eccentric cam (24) are thereby transmitted positively and no longer merely frictionally to the component carrying the receiver hole (10). <IMAGE>

Description

Die vorliegende Erfindung betrifft Radialkolbenpumpen, insbesondere für hydraulische Anlagen, sowie ein Druckerzeugungselement hierfür.The present invention relates to radial piston pumps, in particular for hydraulic systems, and a pressure generating element therefor.

Bei Radialkolbenpumpen, wie sie beispielsweise aus der DE-OS 35 00 432, der DE-OS 34 24 862, der DE-OS 30 39 197 und DE-GM 85 04 213 bekannt sind, werden eine Mehrzahl von zylindrischen Druckerzeugungselementen mit Kolbenaufnahmeteil und gleitend darin gelagertem Kolben radial zu einer Antriebswelle mit Exzenter in ein gemeinsames Pumpengehäuse eingeschraubt. Bei anderen bekannten Radialkolbenpumpen, wie sie beispielsweise aus der DE-PS 923 589 bekannt sind, weisen die Druckerzeugungselemente bzw. genauer die Kolbenaufnahmeteile der Druckerzeugungselemente eine quaderförmige Form auf und sind an Trägerelemente bzw. an das Pumpengehäuse angeschraubt. Die Ausgestaltung der Druckerzeugungselemente als separate von der Radialkolbenpumpe als ganzes lösbare Bauteile gestattet die flexible Anpassung ein und desselben Pumpenkörpers an unterschiedliche Anforderungen hinsichtlich der zu fördernden Medien, der zu erzeugenden Drücke usw.. Bei Radialkolbenpumpen, wie sie beispielsweise aus der DE-PS 923 589 bekannt sind, ergibt sich allerdings der Nachteil, daß durch das Anschrauben des quaderförmigen Kolbenaufnahmeteils an dem Pumpengehäuse bzw. an einem Trägerteil die Gefahr besteht, die Kolbenbohrung in dem Kolbenaufnahmeteil zu deformieren. Da Radialkolbenpumpen auch mit Drehzahlen bis zu 3000 Umdrehungen pro Minute und mehr betrieben werden, kann dies leicht zur Zerstörung der Druckerzeugungselemente führen. Bei Radialkolbenpumpen mit von außen in das Pumpengehäuse eingeschraubten Druckerzeugungselementen bereitet die sinnvolle Anordnung der Ventile Schwierigkeiten, da sich quer zur Schraubrichtung Ventile bzw. Saug- und Druckanschlüsse nur sehr schwer anordnen lassen.In radial piston pumps, as are known for example from DE-OS 35 00 432, DE-OS 34 24 862, DE-OS 30 39 197 and DE-GM 85 04 213, a plurality of cylindrical pressure generating elements with piston receiving part and sliding therein the piston is screwed radially to a drive shaft with an eccentric in a common pump housing. In other known radial piston pumps, as are known for example from DE-PS 923 589, the pressure generating elements or more precisely the piston receiving parts of the pressure generating elements have a cuboid shape and are screwed onto carrier elements or onto the pump housing. The design of the pressure generating elements as separate components that are detachable from the radial piston pump as a whole allows the flexible adaptation of one and the same pump body to different requirements with regard to the media to be conveyed, the pressures to be generated, etc. For radial piston pumps, such as those described in DE-PS 923 589 are known, however, there is the disadvantage that there is a risk of deforming the piston bore in the piston receiving part by screwing the cuboid piston receiving part onto the pump housing or onto a carrier part. Since radial piston pumps are also operated at speeds of up to 3000 revolutions per minute and more, this can easily lead to the destruction of the pressure generating elements. In the case of radial piston pumps with pressure-generating elements screwed into the pump housing from the outside, the sensible arrangement of the valves presents difficulties, since valves or suction and pressure connections can be arranged only with great difficulty transversely to the screwing direction.

Ausgehend von der DE-PS 923 589 ist es Aufgabe der vorliegenden Erfindung eine Radialkolbenpumpe zu schaffen, bei der eine Verformung der Kolbenbohrung durch Verspannungen vermieden wird. Außerdem ist es Aufgabe der vorliegenden Erfindung ein für eine derartige Radialkolbenpumpe geeignetes Druckerzeugungselement anzugeben.Starting from DE-PS 923 589, it is an object of the present invention to provide a radial piston pump in which deformation of the piston bore due to tension is avoided. In addition, it is an object of the present invention to provide a pressure generating element suitable for such a radial piston pump.

Die Lösung dieser Aufgabe erfolgt durch die Merkmale des Anspruchs 1 bzw. 7.This object is achieved by the features of claims 1 and 7, respectively.

Durch das Vorsehen einer Aufnahmeöffnung in dem Pumpengehäuse oder in einem mit dem Pumpengehäuse verbunden Teil, die axial zu der Antriebswelle verläuft, ist es möglich das Druckelement formschlüssig in die Radialkolbenpumpe einzubauen. Die von dem Exzenter ausgeübten Radialkräfte werden somit formschlüssig und nicht mehr nur reibschlüssig auf das die Aufnahmeöffnung tragende Bauteil übertragen. Das die Aufnahmeöffnung tragende Bauteil kann nach unterschiedlichen Anforderungen, wie z.B. mechanische Festigkeit, Schwingungs- und Schalldämpfungsverhalten, Korrosionsfestigkeit, spezifisches Gewicht usw. gestaltet werden. Für den Fall, daß die Kolbenbohrung das Kolbenaufnahmeteil vollständig durchsetzt, kann das die Aufnahmeöffnung tragende Bauteil gleichzeitig die Funktion des Kolbenboden übernehmen. Durch die axiale Anordnung des Druckerzeugungselements in dem die Aufnahmeöffnung tragenden Bauteil können die Druck- und Sauganschlüsse bzw. Druck- und Saugventile nahezu an beliebiger Stelle in bzw. an dem Druckerzeugungselement angeordnet werden.By providing a receiving opening in the pump housing or in a part connected to the pump housing and running axially to the drive shaft, it is possible to install the pressure element in a form-fitting manner in the radial piston pump. The radial forces exerted by the eccentric are thus transmitted positively and no longer only frictionally to the component carrying the receiving opening. The component supporting the receiving opening can be designed according to different requirements, such as mechanical strength, vibration and sound absorption behavior, corrosion resistance, specific weight, etc. In the event that the piston bore completely penetrates the piston receiving part, the component carrying the receiving opening can simultaneously take over the function of the piston head. Due to the axial arrangement of the pressure generating element in the component carrying the receiving opening, the pressure and suction connections or pressure and suction valves can be arranged almost anywhere in or on the pressure generating element.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung nach Anspruch 2 bzw. 3 ist die Aufnahmeöffnung und/oder das in die Aufnahmeöffnung eingesetzte Druckerzeugungselements bzw. Kolbenaufnahmeteils symmetrisch, insbesondere Punktsymmetrisch, bezüglich der axialen Einbaurichtung. Damit kann die Aufnahmeöffnung im einfachsten Fall in Form einer Bohrung mit konstantem Querschnitt ausgeführt sein. Dies vereinfacht die Herstellung der erfindungsgemäßen Radialkolbenpumpe.According to an advantageous embodiment of the invention according to claim 2 or 3, the receiving opening and / or the pressure generating element or piston receiving part inserted into the receiving opening is symmetrical, in particular point symmetrical, with respect to the axial installation direction. In the simplest case, the receiving opening can thus be designed in the form of a bore with a constant cross section. This simplifies the manufacture of the radial piston pump according to the invention.

Gemäß der vorteilhaften Ausgestaltung der Erfindung nach Anspruch 3, ist die Aufnahmeöffnung und/oder die Außenseite des Druckerzeugungselementes bzw. des Kolbenaufnahmeteils profiliert ausgebildet. Diese Profilierung kann einerseits die Schallemission günstig beeinflussen und andererseits kann dadurch das Kolbenaufnahmeteil auf einfache Weise tangential zur Antriebswelle arretiert werden.According to the advantageous embodiment of the invention according to claim 3, the receiving opening and / or the outside of the pressure generating element or the piston receiving part is profiled. On the one hand, this profiling can have a favorable influence on the noise emission and, on the other hand, the piston receiving part can be locked in a simple manner tangential to the drive shaft.

Gemäß einer bevorzugten Ausführungsform nach Anspruch 5, kann die Arretierung des Druckerzeugungselementes bzw. des Kolbenaufnahmeteiles in dem die Aufnahmeöffnung tragenden Bauteil zusätzlich oder alternativ durch ein Befestigungsmittel, z.B. in Form eines Splintstiftes erfolgen.According to a preferred embodiment according to claim 5, the locking of the pressure generating element or the piston receiving part in the component carrying the receiving opening can additionally or alternatively by a fastening means, e.g. in the form of a pin.

Durch die bevorzugte Ausführungsform der Erfindung nach Anspruch 6 kann die Baugröße des Druckerzeugungselements insbesondere des Kolbenaufnahmeteiles reduziert werden.Due to the preferred embodiment of the invention according to claim 6, the size of the pressure generating element, in particular the piston receiving part, can be reduced.

Gemäß der vorteilhaften Ausgestaltung der Erfindung nach Anspruch 7 ist trotz Unterbringung des Saugventils im Kolben eine vergleichsweise einfache Konstruktion möglich, da sich die Saugventilfeder nicht innerhalb des Kolbens abstützt sondern im Kolbenaufnahmeteil selbst.According to the advantageous embodiment of the invention according to claim 7, despite the fact that the suction valve is accommodated in the piston, a comparatively simple construction is possible since the suction valve spring is not supported within the piston but in the piston receiving part itself.

Gemäß Anspruch 8 wird ein besonders geeignetes Druckerzeugungselement bereitgestellt. Dadurch, daß das Kolbenaufnahmeteil quer zu der Bewegungsrichtung des Kolbens angeordnet ist, ist ein axialer Einbau des Druckerzeugungselementes in eine Radialkolbenpumpe möglich.According to claim 8, a particularly suitable pressure generating element is provided. Because the piston receiving part is arranged transversely to the direction of movement of the piston, an axial installation of the pressure generating element in a radial piston pump is possible.

Weitere Einzelheiten, Aspekte und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die Zeichnung.Further details, aspects and advantages of the present invention will become apparent from the following description with reference to the drawing.

Es zeigt:

Fig. 1
eine Schnittansicht einer bevorzugten Ausführungsform der vorliegenden Erfindung,
Fig. 2
eine Schnittansicht der Ausführungsform nach Fig. 1 entlang der Ebene A-A in Fig. 1,
Fig. 3
eine Schnittdarstellung einer ersten Ausführungsform eines erfindungsgemäßen Druckerzeugungselements,
Fig. 4
eine Darstellung des Druckerzeugungselements von Fig. 3 betrachtet von der Seite aus, mit der das Druckerzeugungselement in die Aufnahmeöffnung eingeschoben wird.
Fig. 5
eine zweite Ausführungsform eines erfindungsgemäßen Druckelements in analoger Darstellung wie in Fig. 4
Fig. 6
eine dritte Ausführungsform eines erfindungsgemäßen Druckerzeugungselements
Fig. 7
eine vierte Ausführungsform eines erfindungsgemäßen Druckerzeugungselements, und
Fig. 8, 9 und 10
Detaildarstellungen eines Kolbens für ein erfindungsgemäßes Druckerzeugungselements;
It shows:
Fig. 1
2 shows a sectional view of a preferred embodiment of the present invention,
Fig. 2
2 shows a sectional view of the embodiment according to FIG. 1 along the plane AA in FIG. 1,
Fig. 3
2 shows a sectional illustration of a first embodiment of a pressure generating element according to the invention,
Fig. 4
a view of the pressure generating element of Fig. 3 viewed from the side with which the pressure generating element is inserted into the receiving opening.
Fig. 5
a second embodiment of a printing element according to the invention in an analogous representation as in Fig. 4th
Fig. 6
a third embodiment of a pressure generating element according to the invention
Fig. 7
a fourth embodiment of a pressure generating element according to the invention, and
8, 9 and 10
Detailed representations of a piston for a pressure generating element according to the invention;

Die Figuren 1, 2, 3 und 4 zeigen eine erste Ausführungsform der erfindungsgemäßen Radialkolbenpumpe dem erfindungsgemäßen Druckerzeugungselement. Die Radialkolbenpumpe weist eine Antriebswelle 2 auf, die in einer Druckplatte 4 und einer Flanschplatte 6 gelagert ist. Zwischen der Druckplatte 4 und der Flanschplatte 6 erstreckt sich ein ringförmiges bzw. zylindrisches Pumpengehäuse 8 in dessen Wandung sich die Aufnahmeöffnungen 10 in der Form von Bohrungen befinden. In die Aufnahmeöffnungen sind Druckerzeugungselemente 12 mit Kolbenaufnahmeteil 14, Kolben 16, Kolbenbohrung 18 sowie Saugkanal 20 und Druckkanal 22 eingebaut. In den Figuren ist jeweils nur ein Druckerzeugungselemnt beispielhaft dargestellt. Druckplatte 4, Flanschplatte 6 und Pumpengehäuse 8 umschließen einen Kolbenantriebsraum 7 aus dem das zu komprimierende Fluid über den Saugkanal 20 angesaugt wird.Figures 1, 2, 3 and 4 show a first embodiment of the radial piston pump according to the invention the pressure generating element. The radial piston pump has a drive shaft 2 which is mounted in a pressure plate 4 and a flange plate 6. An annular or cylindrical pump housing 8 extends between the pressure plate 4 and the flange plate 6, in the wall of which the receiving openings 10 are in the form of bores. Pressure generating elements 12 with piston receiving part 14, piston 16, piston bore 18 and suction channel 20 and pressure channel 22 are installed in the receiving openings. In the figures, only one pressure generation element is shown as an example. Pressure plate 4, flange plate 6 and pump housing 8 enclose a piston drive chamber 7 from which the fluid to be compressed is sucked in via the suction channel 20.

Durch einen auf der Antriebswelle 2 befestigten Exzenter 24 wird der Kolben 16 beim Druckhub bewegt; in der Zeichnung nach oben. Der Kolben 16 ist hohl ausgebildet und bildet zusammen mit der Kolbenbohrung 18 einen Kompressionsraum 17. Der Kolben 16 kann gegen die Kolbenbohrung 18 mit einer den Kolben 16 ringförmig umschließenden nicht dargestellten Dichtung abgedichtet werden. Beim Saughub wird der Kolben 16 durch eine Kolbenfeder 26 bewegt - in der Zeichnung nach unten -, die im Inneren des Kolbens 16 angeordnet ist und sich im Kolben 16 selbst und im Kolbenaufnahmeteil 14 am Boden der Kolbenbohrung 18 abstützt. In den Kompressionsraum 17 mündet der Saugkanal 20, der T-förmig ausgebildet ist.The piston 16 is moved during the pressure stroke by an eccentric 24 fastened on the drive shaft 2; up in the drawing. The piston 16 is hollow and, together with the piston bore 18, forms a compression space 17. The piston 16 can be sealed against the piston bore 18 with a seal, not shown, which surrounds the piston 16 in a ring. During the suction stroke, the piston 16 is moved by a piston spring 26 - downward in the drawing - which is arranged in the interior of the piston 16 and is supported in the piston 16 itself and in the piston receiving part 14 at the bottom of the piston bore 18. The suction channel 20, which is T-shaped, opens into the compression space 17.

Der Saugkanal 20 ist in dem Kolben 16 integriert, während der Druckanschluß seitlich im Kolbenaufnahmeteil 14 in Kontakt mit der Druckplatte 4 vorgesehen ist. Im Saugkanal 20 bzw. im Druckkanal 22 ist ein Saugventil 30 bzw. ein Druckventil 32 in Form von Kugelventilen angeordnet. Das Saugventil 30 besteht aus einer Kugel 34, die durch eine Saugventilfeder 36 gegen einen Saugventilsitz 38 im Inneren des Kolbens 16 gedrückt wird und den Saugkanal 20 während des Druckhubes gegen den Kolbenantriebsraum 7 abdichtet. Die Saugventilfeder 36 stützt sich am Boden der Kolbenbohrung 18 an dem Kolbenaufnahmeteil 14 und an der Kugel 34 ab.The suction channel 20 is integrated in the piston 16, while the pressure connection is provided laterally in the piston receiving part 14 in contact with the pressure plate 4. In the suction channel 20 or in the pressure channel 22, a suction valve 30 or a pressure valve 32 is arranged in the form of ball valves. The suction valve 30 consists of a ball 34 which is pressed by a suction valve spring 36 against a suction valve seat 38 inside the piston 16 and seals the suction channel 20 against the piston drive chamber 7 during the pressure stroke. The suction valve spring 36 is supported on the bottom of the piston bore 18 on the piston receiving part 14 and on the ball 34.

Der Druckkanal 22 verbindet den Kompressionsraum 17 mit einer in der Druckplatte 4 untergebrachten Druckanschlußleitung 40. Im Druckkanal 22 ist das Druckventil 32 mit einer Druckventilfeder 42, einer Kugel 44 und einem Kugelanschlag 46 untergebracht. Der Druckkanal 22 ist gegenüber der Druckplatte 4 durch eine Dichtung 48 abgedichtet.The pressure channel 22 connects the compression space 17 to a pressure connection line 40 accommodated in the pressure plate 4. In the pressure channel 22, the pressure valve 32 is accommodated with a pressure valve spring 42, a ball 44 and a ball stop 46. The pressure channel 22 is sealed off from the pressure plate 4 by a seal 48.

Durch die Drehbewegung der Antriebswelle 2 wird der Kolben 16 periodisch durch den Exzenter 24 in das Kolbenaufnahmeteil 14 hineingeschoben - Druckhub - und durch die Kolbenfeder 26 periodisch wieder aus dem Kolbenaufnahmeteil 14 bis zum unteren Umkehrpunkt herausgedrückt. Infolge des durch den Hub entstehenden Unterdrucks wird die Kugel 34 gegen die Saugventilfeder 36 vom Kugelsitz abgehoben und das Fluid kann durch den T-förmigen Saugkanal 20 in den Kompressionsraum 17 in die Kolbenbohrung 18 einströmen. Der Druckkanal 22 wird dabei durch die von der Druckventilfeder 42 belasteten Kugel 44 abgeschlossen. Wird nun während des Druckhubs der Kolben 16 durch den Exzenter 24 in den oberen Umkehrpunkt bewegt, drückt die Saugventilfeder 36 und der sich aufbauende höhere Druck die Kugel 34 auf den Saugventilsitz 38 und die Kugel 44 wird aufgrund des sich aufbauenden hohen Drucks gegen die Druckventilfeder 42 von ihrem Sitz abgehoben. Der Kugelanschlag 46 begrenzt den möglichen Weg der Kugel 44 in dem in den Druckkanal 22 abströmenden Fluid.Due to the rotary movement of the drive shaft 2, the piston 16 is periodically pushed into the piston receiving part 14 by the eccentric 24 - pressure stroke - and periodically pushed out of the piston receiving part 14 again by the piston spring 26 to the lower reversal point. As a result of the vacuum created by the stroke, the ball 34 is lifted off the ball seat against the suction valve spring 36 and the fluid can flow through the T-shaped suction channel 20 into the compression space 17 into the piston bore 18. The pressure channel 22 is closed off by the ball 44 loaded by the pressure valve spring 42. If, during the pressure stroke, the piston 16 is moved into the upper reversal point by the eccentric 24, the suction valve spring 36 and the higher pressure which builds up pushes the ball 34 onto the suction valve seat 38 and the ball 44 is pressed against the pressure valve spring 42 due to the high pressure building up lifted from their seat. The ball stop 46 limits the possible path of the ball 44 in the fluid flowing into the pressure channel 22.

Mit einem in den Fig. 1 und 2 nicht näher dargestellten Splintstift, der das Pumpengehäuse 8 durchsetzt und zum Teil in das Kolbenaufnahmeteil 14 des Druckerzeugungselements 12 hineinragt, wird das Druckerzeugungselement 12 gegen Verdrehung in der Aufnahmeöffnung 10 gesichert.With a cotter pin, not shown in FIGS. 1 and 2, which passes through the pump housing 8 and partially protrudes into the piston receiving part 14 of the pressure generating element 12, the pressure generating element 12 is secured against rotation in the receiving opening 10.

Alternativ läßt sich dies bei der in Fig. 5 gezeigten Ausführungsform eines Druckerzeugungselements 50 auch dadurch erreichen, daß die Außenseite des Kolbenaufnahmeteils 14 profiliert ist und diese Profilierung 52 in eine korrespondierende Profilierung in der Aufnahmeöffnung 10 eingreift. Abgesehen von der Profilierung 52 stimmt das Druckerzeugungselement 50 mit dem Druckerzeugungselement 12 überein.Alternatively, in the embodiment of a pressure generating element 50 shown in FIG. 5, this can also be achieved by profiling the outside of the piston receiving part 14 and engaging this profiling 52 in a corresponding profiling in the receiving opening 10. Apart from the profiling 52, the pressure generating element 50 corresponds to the pressure generating element 12.

In den Ausführungsformen gemäß den Fig. 1 bis 5 ist das Saugventil 30 am Ende des T-förmigen Saugkanals 20 im Inneren des Kolbens 16 angeordnet. Das Saugventil 30 kann aber nicht nur im Kolben, sondern nahezu an jeder beliebigen Stelle im Druckerzeugungselement untergebracht werden. Beispiele hierfür sind in den Druckerzeugungselementen 60 und 70 gemäß Fig. 6 und 7 dargestellt.In the embodiments according to FIGS. 1 to 5, the suction valve 30 is arranged at the end of the T-shaped suction channel 20 in the interior of the piston 16. The suction valve 30 can, however, not only be accommodated in the piston, but almost anywhere in the pressure generating element. Examples of this are shown in the pressure generating elements 60 and 70 according to FIGS. 6 and 7.

Die Ausführungsform des Druckerzeugungselements 60 nach Fig. 6 weist einen Saugkanals 62 auf, der parallel neben der Kolbenbohrung 18 angeordnet ist. Der Saugkanal 62 mündet neben der Kolbenbohrung 18 in den Kolbenantriebsraum 17, so daß das zu komprimierende Fluid aus dem Kolbenantriebsraum 17 angesaugt werden kann. Unmittelbar hinter der Mündung des Saugkanals 62 in den Kolbenantriebsraum 17 ist ein Saugventil 66 angeordnet. Das Saugventil 66 unterscheidet sich von dem Saugventil 30 lediglich in der Ausgestaltung der Saugventilfeder. Das Saugventil 66 weist eine Saugventilfeder 68 auf, die sich an einem Absatz 69 abstützt und nicht an dem Boden der Kolbenbohrung 18, wie dies bei der Saugventilfeder 36 der vorstehend beschriebenen Ausführungsformen der Fall ist. Der Saugkanal 62 mündet in den Druckkanal 22, in dem das Druckventil 32 untergebracht ist. Die Ausgestaltung und Funktion des Druckventils 32 und der übrigen Komponenten stimmt völlig mit der Ausgestaltung und Funktion der Ausführungsformen nach den Fig. 1 bis 5 überein, so daß sich eine detaillierte Beschreibung erübrigt.The embodiment of the pressure generating element 60 according to FIG. 6 has a suction channel 62 which is arranged in parallel next to the piston bore 18. The suction channel 62 opens next to the piston bore 18 in the piston drive chamber 17, so that the fluid to be compressed can be sucked out of the piston drive chamber 17. A suction valve 66 is arranged immediately behind the mouth of the suction channel 62 in the piston drive chamber 17. The suction valve 66 differs from the suction valve 30 only in the configuration of the suction valve spring. The suction valve 66 has a suction valve spring 68 which is supported on a shoulder 69 and not on the bottom of the piston bore 18, as is the case with the suction valve spring 36 of the above-described embodiments. The suction channel 62 opens into the pressure channel 22 in the the pressure valve 32 is housed. The design and function of the pressure valve 32 and the other components completely match the design and function of the embodiments according to FIGS. 1 to 5, so that a detailed description is unnecessary.

Fig. 7 zeigt eine weiter Ausführungsform eines Druckerzeugungselementes 70. Das Druckerzeugungselement 70 weist einen Saugkanal 72 auf, der nicht in den Kolbenantriebsraum mündet, sondern in eine in der Flanschplatte 6 untergebrachte Saugzuleitung 74. Saugkanal 72 bzw. Saugzuleitung 74 sind durch eine Dichtung 76 abgedichtet. Das im Saugkanal 72 untergebrachte Saugventil 78 stimmt völlig mit dem Saugventil 66 des Druckerzeugungselementes 60 überein. Die Die Ausführungsform nach Fig. 7 ist besonders vorteilhaft bei zu komprimierenden Fluiden, die aufgrund ihrer chemischen (z.B. korrosiv), physikalischen (z.B. Temperatur), und/oder biologischen (z.B. bakteriologisch verseucht) Eigenschaften getrennt von den übrigen Teilen der Radialkolbenpumpe geführt werden sollen.7 shows a further embodiment of a pressure generating element 70. The pressure generating element 70 has a suction channel 72, which does not open into the piston drive chamber, but rather into a suction feed line 74 accommodated in the flange plate 6. Suction channel 72 or suction feed line 74 are sealed by a seal 76 . The suction valve 78 accommodated in the suction channel 72 corresponds completely to the suction valve 66 of the pressure generating element 60. The embodiment according to FIG. 7 is particularly advantageous in the case of fluids to be compressed which, owing to their chemical (for example corrosive), physical (for example temperature) and / or biological (for example bacteriologically contaminated) properties, are to be carried out separately from the other parts of the radial piston pump .

Fig. 8 zeigt eine für die Förderung derartiger Fluide besonders geeignete Gestaltung eines Kolbens 80. Eine Kolbenfeder 82 umschließt den Kolben 80 im dem Bereich, der aus der Kolbenbohrung herausragt. Die Kolbenfeder 82 stützt sich am Rand der Kolbenbohrung 18 und an einem Absatz 84 ab. Natürlich ist die Ausführungsform des Kolbens gemäß Fig. 8 nicht auf die Förderung von korrosiven Medien beschränkt.FIG. 8 shows a design of a piston 80 that is particularly suitable for the delivery of such fluids. A piston spring 82 surrounds the piston 80 in the region that protrudes from the piston bore. The piston spring 82 is supported on the edge of the piston bore 18 and on a shoulder 84. Of course, the embodiment of the piston according to FIG. 8 is not limited to the conveyance of corrosive media.

In Fig. 9 ist eine besondere Ausgestaltung eines Kolbens 90 dargestellt. Der Kolben 90 besteht aus einem Kolbenteil 91 und einer Gleitscheibe 92. Durch die Trennung des Kolbens 90 im Kolbenteil 91 und Gleitscheibe 92 lassen sich Querkräfte reduzieren, die durch Fertigungstoleranzen auftreten können. Durch eine mehr oder weniger zentrale Bohrung 94 im Kolbenteil bzw. 95 in der Gleitscheibe 92 ist eine hydrostatische Entlastung des Kolbens 90 möglich. Diese Art der hydrostatischen Entlastung ist jedoch nur möglich, wenn der Saugkanal nicht im Inneren des Kolbens liegt. Die Ausführungsform des Kolbens 90 eignet sich daher besonders für das in Fig. 6 dargestellte Druckerzeugungselement 60.9 shows a special embodiment of a piston 90. The piston 90 consists of a piston part 91 and a sliding washer 92. The separation of the piston 90 in the piston part 91 and the sliding washer 92 makes it possible to reduce transverse forces which can occur due to manufacturing tolerances. Through a more or less central bore 94 in the piston part or 95 in the sliding washer 92 there is a hydrostatic one Relief of the piston 90 possible. However, this type of hydrostatic relief is only possible if the suction channel is not inside the piston. The embodiment of the piston 90 is therefore particularly suitable for the pressure generating element 60 shown in FIG. 6.

Für die Ausführungsformen nach Fig. 1 bis 5 bei denen der Saugkanal im Kolben integriert ist, zeigt der in Fig. 10 dargestellte Kolben 100 eine Möglichkeit für eine hydrostatische Entlastung auf. Eine Entlastungsbohrung 104 wird so in Bewegungsrichtung des Kolbens gelegt, daß sie einen querverlaufenden T-förmigen Saugkanals 102 nicht durchsetzt. Die Entlastungsbohrung 104 ist in Fig. 10 aus zeichnerischen Gründen um 90° versetzt gezeichnet.For the embodiments according to FIGS. 1 to 5 in which the suction channel is integrated in the piston, the piston 100 shown in FIG. 10 shows a possibility for a hydrostatic relief. A relief bore 104 is placed in the direction of movement of the piston so that it does not pass through a transverse T-shaped suction channel 102. The relief bore 104 is shown in FIG. 10 offset by 90 ° for reasons of drawing.

Claims (8)

Radialkolbenpumpe, insbesondere für Hydraulikanlagen, mit
einem Pumpengehäuse (8),
wenigstens einem Druckerzeugungselement (12; 50; 60; 70), daß mindestens einen Kolben (16; 80; 90) aufweist, der in einem Kolbenaufnahmeteil (14) gleitend gelagert ist,
wenigstens einem Saug- und einem Druckkanal (20 bzw. 22),
einer Antriebswelle (2), und
einem mit der Antriebswelle (2) verbundenen Exzenter (24) durch den der Kolben (16; 80; 90) des Druckerzeugungselementes (12; 50; 60; 70) in Hin- und Herbewegung versetzbar ist, dadurch gekennzeichnet,
daß das Pumpengehäuse (8) eine im wesentlichen axial zu der Antriebswelle (2) angeordnete Aufnahmeöffnung (10) aufweist, in die das Druckerzeugungselement (12; 50; 60; 70) formschlüssig eingebaut ist.Radial piston pump, especially for hydraulic systems, with
a pump housing (8),
at least one pressure generating element (12; 50; 60; 70) which has at least one piston (16; 80; 90) which is slidably mounted in a piston receiving part (14),
at least one suction and one pressure channel (20 or 22),
a drive shaft (2), and
an eccentric (24) connected to the drive shaft (2) through which the piston (16; 80; 90) of the pressure generating element (12; 50; 60; 70) can be moved back and forth , characterized in that
that the pump housing (8) has a substantially axially arranged to the drive shaft (2) receiving opening (10), in which the pressure generating element (12; 50; 60; 70) is installed in a form-fitting manner. Radialkolbenpumpe nach Anspruch 1, dadurch gekennzeichnet, daß die Aufnahmeöffnung (10) und/oder das Druckerzeugungselement (12; 50; 60; 70) symmetrisch bezüglich der Einbaurichtung des Druckerzeugungselementes ist.Radial piston pump according to claim 1, characterized in that the receiving opening (10) and / or the pressure generating element (12; 50; 60; 70) is symmetrical with respect to the installation direction of the pressure generating element. Radialkolbenpumpe nach Anspruch 2, dadurch gekennzeichnet, daß ein Querschnitt durch die Aufnahmeöffnung (10) und/oder ein Querschnitt durch das Druckerzeugungselementes (12; 50; 60; 70), jeweils senkrecht zur Einbaurichtung des Druckerzeugungselementes, punktsymmetrisch ist.Radial piston pump according to claim 2, characterized in that a cross section through the receiving opening (10) and / or a cross section through the pressure generating element (12; 50; 60; 70), each perpendicular to the installation direction of the pressure generating element, is point symmetrical. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, das die Aufnahmeöffnung (10) und/oder die Außenseite des Druckerzeugungselementes (12; 50; 60; 70) bzw. des Kolbenaufnahmeteils (14) profiliert sind.Radial piston pump according to one of the preceding claims, characterized in that the receiving opening (10) and / or the outside of the pressure generating element (12; 50; 60; 70) or the piston receiving part (14) are profiled. Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Druckerzeugungselement (12; 50; 60; 70) durch ein Befestigungsmittel, z.B. in Form eines Splintstiftes, in der Aufnahmeöffnung (10) arretiert ist.Radial piston pump according to one of the preceding claims, characterized in that the pressure generating element (12; 50; 60; 70) by a fastening means, e.g. in the form of a pin, is locked in the receiving opening (10). Radialkolbenpumpe nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß im Druckkanal (22) wenigstens ein Druckventil (32) und/oder im Saugkanal (20) wenigstens ein Saugventile (30; 66, 78) angeordnet ist.Radial piston pump according to one of the preceding claims, characterized in that at least one pressure valve (32) is arranged in the pressure channel (22) and / or at least one suction valve (30; 66, 78) is arranged in the suction channel (20). Radialkolbenpumpe nach Anspruch 6, dadurch gekennzeichnet, daß das Saugventil (30) im Kolben (16) untergebracht ist und aus einem Verschlußelement vorzugsweise in Form einer Kugel (34) und einer sich im Kolbenaufnahmeteil (14) abstützenden Saugventilfeder (36) besteht.Radial piston pump according to claim 6, characterized in that the suction valve (30) is accommodated in the piston (16) and consists of a closure element, preferably in the form of a ball (34), and a suction valve spring (36) which is supported in the piston receiving part (14). Druckerzeugungselement für Fluide, insbesondere zum Einbau in Radialkolbenpumpen nach einem der vorhergehenden Ansprüche, mit mindestens einem Kolben (16; 80; 90), der in einer Kolbenbohrung (18) in einem Kolben aufnahmeteil (14) gleitend gelagert ist, dadurch gekennzeichnet,
daß der Kolben (16; 80; 90) bzw. die Kolbenbohrung (18) quer zur Einbaurichtung des Druckerzeugungselements in die Radialkolbenpumpe angeordnet ist.Pressure generating element for fluids, in particular for installation in radial piston pumps according to one of the preceding claims, with at least one piston (16; 80; 90) which is in a piston bore (18) in a piston receiving part (14) is slidably mounted, characterized in that
that the piston (16; 80; 90) or the piston bore (18) is arranged transversely to the installation direction of the pressure generating element in the radial piston pump.
EP90122409A 1989-11-27 1990-11-23 Radial pistons pump, in particular for hydraulic system and pressurizing element therefor Expired - Lifetime EP0430099B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3939184A DE3939184A1 (en) 1989-11-27 1989-11-27 RADIAL PISTON PUMP, ESPECIALLY FOR HYDRAULIC SYSTEMS AND PRINTING ELEMENT HERE
DE3939184 1989-11-27

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Publication Number Publication Date
EP0430099A1 true EP0430099A1 (en) 1991-06-05
EP0430099B1 EP0430099B1 (en) 1994-10-05

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ID=6394279

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Application Number Title Priority Date Filing Date
EP90122409A Expired - Lifetime EP0430099B1 (en) 1989-11-27 1990-11-23 Radial pistons pump, in particular for hydraulic system and pressurizing element therefor

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DE (2) DE3939184A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999042725A3 (en) * 1998-02-17 1999-11-18 Continental Teves Ag & Co Ohg Piston pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4241827A1 (en) * 1992-12-11 1994-06-16 Teves Gmbh Alfred Noise-reduced pump unit, especially for regulated brake systems

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FR22669E (en) * 1919-12-24 1921-08-04 Francois Louis Caut Rotary device that can be used as a pump, motion transmitter motor, brake and other applications
GB533405A (en) * 1939-11-03 1941-02-12 Automotive Prod Co Ltd Improvements in or relating to reciprocating pumps
FR2323031A1 (en) * 1975-09-08 1977-04-01 Ferodo Sa Radial piston hydraulic machine - has axial passages in shaft mounting eccentrically ported and controlled by ball slidable in opposed sockets
DE3330803A1 (en) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Feed element
EP0304743A1 (en) * 1987-08-25 1989-03-01 WEBER S.r.l. Radial piston pump

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Publication number Priority date Publication date Assignee Title
DE923589C (en) * 1949-11-18 1955-02-17 Heilmeier & Weinlein O H G Hydraulic piston pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR22669E (en) * 1919-12-24 1921-08-04 Francois Louis Caut Rotary device that can be used as a pump, motion transmitter motor, brake and other applications
GB533405A (en) * 1939-11-03 1941-02-12 Automotive Prod Co Ltd Improvements in or relating to reciprocating pumps
FR2323031A1 (en) * 1975-09-08 1977-04-01 Ferodo Sa Radial piston hydraulic machine - has axial passages in shaft mounting eccentrically ported and controlled by ball slidable in opposed sockets
DE3330803A1 (en) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Feed element
EP0304743A1 (en) * 1987-08-25 1989-03-01 WEBER S.r.l. Radial piston pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999042725A3 (en) * 1998-02-17 1999-11-18 Continental Teves Ag & Co Ohg Piston pump
US6450787B1 (en) 1998-02-17 2002-09-17 Continental Teves Ag & Co., Ohg Piston pump

Also Published As

Publication number Publication date
DE3939184C2 (en) 1991-11-14
EP0430099B1 (en) 1994-10-05
DE3939184A1 (en) 1991-05-29
DE59007385D1 (en) 1994-11-10

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