EP1132619B1 - Multicomponent built casing - Google Patents

Multicomponent built casing Download PDF

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Publication number
EP1132619B1
EP1132619B1 EP01102964A EP01102964A EP1132619B1 EP 1132619 B1 EP1132619 B1 EP 1132619B1 EP 01102964 A EP01102964 A EP 01102964A EP 01102964 A EP01102964 A EP 01102964A EP 1132619 B1 EP1132619 B1 EP 1132619B1
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EP
European Patent Office
Prior art keywords
housing body
housing
cover
part construction
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01102964A
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German (de)
French (fr)
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EP1132619A2 (en
EP1132619A3 (en
Inventor
Guido Bredenfeld
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1132619A2 publication Critical patent/EP1132619A2/en
Publication of EP1132619A3 publication Critical patent/EP1132619A3/en
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Publication of EP1132619B1 publication Critical patent/EP1132619B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086Carter
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Definitions

  • the invention is based on a multi-part housing, this is for a hydraulic pump operating as a pump or motor Working machine, in particular provided for a gear machine is, and that the features of the preamble of the claim 1 has.
  • Such a housing has, for example, one of DE-OS 24 19 855 known external gear pump.
  • the housing body is today mostly made of aluminum in an extrusion process.
  • aluminum has the disadvantage of one compared to Steel or cast iron lower strength. It also has aluminum no pronounced fatigue range.
  • the engine receiving chamber of hydraulic machines is constantly changing under operating conditions Press suspended. Especially in the field of high-pressure Supply channels can thereby the housing body occurring stresses are so great that cracks and housing breaks occur. Become known solutions for this Problem is exhausted in it, the material load through Enlargement of the wall thickness, the use of high-strength aluminum alloys or by strain hardening of the fracture-prone Increase cross sections. However, these measures increase the volume of construction and / or make the production of a housing body more expensive.
  • the housing comprises a housing body for training an engine receiving chamber with a continuous Recess is provided.
  • Lids are attached to the chamber to the environment Close.
  • the housing parts are by adjusting pins aligned with each other and with the help of Bolt connected together.
  • the alignment pins are located itself in a plane passing through the axes of the two external gears is spanned and perpendicular to the axis of the two supply channels. Based on the positioning of the Alignment pins can be seen that they do not have the function to counteract a widening of the middle housing body. But the strength of Justierstatte leaves an essential Do not expect power transmission over them.
  • DE 33 24 831 A1 shows a vane pump, in which a Cover and a housing body in the abutting Surfaces coincided with each other and the parting plane have inclined grooves that are liquid or flowable cast-in and hardenable material, for example the Melt of a plastic or metal, are filled.
  • a Cover and a housing body in the abutting Surfaces coincided with each other and the parting plane have inclined grooves that are liquid or flowable cast-in and hardenable material, for example the Melt of a plastic or metal, are filled.
  • the cover and the housing are to be connected to each other and the parting line be sealed in between.
  • the material in the joints thus fulfills the function a seal. Furthermore, the material fulfills the function Cover and housing body to hold together.
  • the problem a widening of the housing body by the pressure in the interior is irrelevant in scripture, as we can see from that the filled material can also be plastic, so that no great powers can be absorbed. The location the supply channels is not visible.
  • US 3 494 293 shows a spiral pump, the parts of which are obvious Made of plastic and are clipped together.
  • a housing of a hydraulic machine with the features of claim 1 or the independent claim 11 has the advantage that with low production overhead high strength, long life and a high compressive strength of the housing body is achieved.
  • claim 1 are about the screw and the system intended to extend beyond the plane surfaces, the one due to their arrangement one in the direction of the supply channels directed expansion of the housing body Act.
  • the funds form a positive connection between the Lid and the housing body.
  • the means are special easy and inexpensive to display, if they are in the form of a blind hole Recesses are formed in the lids, in the housing body is used in sections or if they performed in the form of fitting bodies and associated recesses are.
  • a particularly good effectiveness of the means is achieved, if the lid and the housing body made of different materials are manufactured and if the material of the cover a higher Strength than that of the housing body has.
  • Means in shape recesses in the lid are also particularly suitable good for arranging seals to seal the engine chamber opposite the environment.
  • the housing body facing end surfaces the lid crowned convexly outwards.
  • the biasing force of both components is due to this deformation of the lid higher than with lids with plan end faces. Mechanically, this measure affects this way from that higher between the housing body and the lid Static friction are effective.
  • a larger stiction works due to the limited relative mobility of the components also an operating pressure-related expansion of the housing body opposite.
  • FIG. 1 is based on an exploded view of the per se known structure of a gear machine shown.
  • FIGS. 2 to 6 show cover of a housing for a gear machine partly in different views.
  • gearwheel machine 10th has a housing of a housing body 14 and 16 of lids and 18.
  • the housing body 14 is formed as an extruded profile and has a continuous recess 12. The latter is closed by the lid 16 and 18 to the environment.
  • Seal the lid 16 and 18 are on the front sides of the housing body 14 seals 19 provided.
  • One of the lids 16 is formed as a flange plate with a through hole 20, through which a torque transmitting shaft 22 protrudes outwards.
  • About the flange plate can be the gear machine 10 with an input / output unit, such as a Electric motor or a generator, depending on the operation of the Gear machine 10 as a pump or motor, couple.
  • the lids 16, 18 are bolted to the housing body 14. These are each four, trained in the corners of the lid holes 23 provided through which fastening screws 26 in threaded holes 28 of the housing body 14 can be screwed are.
  • the closed by the covers 16, 18 recess 12 forms an engine chamber 30 for receiving the engine 24.
  • the latter consists of two meshing with each other in external engagement Gears 32 and 34, which on the torque transmitting shaft 22 and a secondary shaft 36 arranged parallel thereto are.
  • the gear 34 can rotate or freely movable be arranged on the secondary shaft while the gear 32nd rotatably connected to the outwardly leading shaft 22, to transmit a torque.
  • the gears 32 and 34 mesh at least in interlocking engagement with each other.
  • bushings 38 to 44th For supporting the shafts 22 and 36 are bushings 38 to 44th present, in pairs on both sides of the gears 32, 34 are arranged. These bushings serve 38 to 44 beyond that also for the axial sealing of the gears 32, 34 and the housing body 14 limited tooth chambers.
  • the substantially cylindrical bushings 38 to 44 have on each side of a flattening 46, with each other issue.
  • the outer contour of a pair of bearing bushes 38 to 44 thereby substantially corresponds to the contour of a Eight.
  • a correspondingly shaped inner contour of the recess 12 the housing body 14 allows a radial support of the Bushings 38 to 44 in the chamber 30.
  • the supply channels 48, 50 run radially to the engine chamber 30.
  • the housing body 14 expands, the maximum expansion in the area of the mouth of the high-pressure-carrying Supply channels 48, 50 is measurable.
  • the high pressure loaded portion of the housing body 14 is through the supply channel also arranged there 48, 50 and through the threaded holes 51 for anchoring any Connecting piece mechanically weakened.
  • the pressure level fluctuates in the case of operation of the gear machine 10 periodically, usually at high frequency.
  • the problem underlying the invention is therefore in it structurally simple and inexpensive realizable measures suggest that the occurring on the housing body 14 At least partially divert stresses to the covers 16, 18 thereby the voltages on the housing body 14 to a non-critical Lower level.
  • Aluminum as material for the housing body 14 should also be retained for manufacturing reasons be like the outer dimensions of the housing 11th
  • means 52 to provide between the housing body 14 and the covers 16, 18, the one of the expansion of the housing body 14 in the direction of the supply channels 48, 50 counteracting Form fit.
  • FIG. 2 In the first embodiment of Figure 2 is in these means 52 to a recess 54 on the housing body 14 facing side of at least one lid 16, 18th
  • the recess 54 is in its dimensions on the outer contour the housing body 14 is tuned such that at least in one Section plane X by the gear machine 10, the vertical stands on the lids and in the supply channels 48, 50 run, backlash between cover 16, 18 and housing body 14 exists.
  • the tensions of the housing body 14 are by these means 52 in Tensile stresses of the lid 16, 18 converted, so that the voltage level at break-prone cross-section sinks. Especially this measure is effective when the material of the lid 16, 18th has a higher strength than the housing body 14. Clearly would be in addition to a higher-strength aluminum alloy, for example Also conceivable steel or cast iron.
  • the pinhole holes 58 are on the housing body 14 facing side a lid 16, 18 provided while the dowel pins on the housing body 14 are anchored and out of the face of this Protruding housing body 14. They extend in the longitudinal direction the gear machine 10.
  • the means 52 are designed as so-called pressure webs 60, the imaginary and in the direction of the supply channels 48, 50 guided cutting plane X vertically intersect and thus aligned perpendicular to the expansion direction of the housing 14 are.
  • the pressure ridges 60 engage in recesses provided for this purpose 62, which alternatively on the lid 16, 18 or on the housing body 14 may be formed.
  • Leave the pressure bars 60 integrally molded on one of these two components or as separate inserts.
  • Pressure bars 60 have in difference to the mentioned in the second embodiment dowel pins a rectangular cross-section with rounded edges. Their advantage is, among other things, that they due to a larger of the expansion counteracting bearing surface lower Tensions are exposed.
  • the means 52 are as a texture 64 between the facing sides of the lid 16, 18 and the housing body 14 is formed.
  • This in figure 5 only schematically illustrated texture 64 forms a kind of Dovetailing between these components, their teeth and tooth gaps comparable to the pressure webs 60 according to the embodiment 3 perpendicular to the widening direction along the end faces on the housing body 14 and cover 16, 18 are aligned.
  • Each tooth has a correspondingly shaped tooth space on the adjacent one Assigned component.
  • a Cover 16, 18 in front view and plan view show the housing surface 14 facing the cover surface 66 is spherical arched outwards.
  • the vault does not necessarily have to be in Direction of the vertical axis marked Y and in the cutting plane X can extend, but also only in the direction of Extend vertical axis Y
  • the direction Y of the vertical axis runs perpendicular to the direction of expansion of the housing body 14 and crosses, as with the other proposed solutions, the sectional plane X.
  • the end face of the Housing body 14 alternatively or in addition to the front of the Cover 16.18 be curved convex to the outside.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem mehrteilig aufgebauten Gehäuse, das für eine als Pumpe oder Motor arbeitende hydraulische Arbeitsmaschine, insbesondere für eine Zahnradmaschine vorgesehen ist, und das die Merkmale aus dem Oberbegriff des Patentanspruchs 1 aufweist.The invention is based on a multi-part housing, this is for a hydraulic pump operating as a pump or motor Working machine, in particular provided for a gear machine is, and that the features of the preamble of the claim 1 has.

Ein derartiges Gehäuse hat zum Beispiel eine aus der DE-OS 24 19 855 bekannte Außenzahnradpumpe.Such a housing has, for example, one of DE-OS 24 19 855 known external gear pump.

Unter anderem aus Kostengründen ist der Gehäusekörper heute meist aus Aluminium in einem Strangpressverfahren hergestellt. Aluminium hat allerdings den Nachteil einer im Vergleich zu Stahl oder Grauguss geringeren Festigkeit. Zudem weist Aluminium keinen ausgeprägten Dauerfestigkeitsbereich auf.Among other things, for cost reasons, the housing body is today mostly made of aluminum in an extrusion process. However, aluminum has the disadvantage of one compared to Steel or cast iron lower strength. It also has aluminum no pronounced fatigue range.

Die das Triebwerk aufnehmende Kammer von hydraulischen Arbeitsmaschinen ist unter Betriebsbedingungen stetig wechselnden Drücken ausgesetzt. Insbesondere im Bereich des hochdruckführenden Versorgungskanals können dadurch die am Gehäusekörper auftretenden Spannungen so groß werden, dass Risse und Gehäusebrüche auftreten. Bekannt gewordene Lösungen für dieses Problem erschöpfen sich darin, die Materialbelastbarkeit durch Vergrößerung der Wandstärken, den Einsatz hochfester Aluminiumlegierungen oder durch Kaltverfestigungen der bruchgefährdeten Querschnitte zu erhöhen. Diese Maßnahmen erhöhen jedoch das Bauvolumen und/oder verteuern die Herstellung eines Gehäusekörpers.The engine receiving chamber of hydraulic machines is constantly changing under operating conditions Press suspended. Especially in the field of high-pressure Supply channels can thereby the housing body occurring stresses are so great that cracks and housing breaks occur. Become known solutions for this Problem is exhausted in it, the material load through Enlargement of the wall thickness, the use of high-strength aluminum alloys or by strain hardening of the fracture-prone Increase cross sections. However, these measures increase the volume of construction and / or make the production of a housing body more expensive.

Bei der aus der DE-OS 24 19 855 bekannten Außenzahnradpumpe umfasst das Gehäuse einen Gehäusekörper, der zur Ausbildung einer das Triebwerk aufnehmenden Kammer mit einer durchgehenden Ausnehmung versehen ist. An den beiden Stirnseiten des Gehäusekörpers sind Deckel befestigt, die die Kammer zur Umgebung hin verschließen. Die Gehäuseteile sind durch Justierstifte relativ zueinander ausgerichtet und mit Hilfe von Schraubbolzen miteinander verbunden. Die Justierstifte befinden sich in einer Ebene, die durch die Achsen der beiden Außenzahnräder aufgespannt ist und senkrecht auf der Achse der beiden Versorgungskanäle steht. Anhand der Positionierung der Justierstifte ist ersichtlich, dass sie nicht die Funktion haben, einer Aufweitung des mittleren Gehäusekörpers entgegenzuwirken. Aber auch die Stärke der Justierstifte lässt eine wesentliche Kraftübertragung über sie nicht erwarten.In the known from DE-OS 24 19 855 external gear pump The housing comprises a housing body for training an engine receiving chamber with a continuous Recess is provided. At the two front sides of the housing body Lids are attached to the chamber to the environment Close. The housing parts are by adjusting pins aligned with each other and with the help of Bolt connected together. The alignment pins are located itself in a plane passing through the axes of the two external gears is spanned and perpendicular to the axis of the two supply channels. Based on the positioning of the Alignment pins can be seen that they do not have the function to counteract a widening of the middle housing body. But the strength of Justierstifte leaves an essential Do not expect power transmission over them.

Die DE 33 24 831 A1 zeigt eine Flügelzellenpumpe, bei der ein Deckel und ein Gehäusekörper in den aneinander anliegenden Flächen miteinander zur Deckung gebrachte und zur Trennebene geneigte Nuten aufweisen, die mit einem flüssig oder fließfähig eingegossenen und aushärtbaren Material, zum Beispiel der Schmelze eines Kunststoffes oder Metalls, gefüllt sind. Damit sollen Deckel und Gehäuse miteinander verbunden und die Trennfuge dazwischen abgedichtet werden.DE 33 24 831 A1 shows a vane pump, in which a Cover and a housing body in the abutting Surfaces coincided with each other and the parting plane have inclined grooves that are liquid or flowable cast-in and hardenable material, for example the Melt of a plastic or metal, are filled. In order to The cover and the housing are to be connected to each other and the parting line be sealed in between.

Das in den Fugen befindliche Material erfüllt also die Funktion einer Dichtung. Weiterhin erfüllt das Material die Funktion, Deckel und Gehäusekörper aneinander zu halten. Das Problem einer Aufweitung des Gehäusekörpers durch den Druck im Innern ist in der Schrift ohne Belang, wie schon daran erkennbar ist, dass das eingefüllte Material auch Kunststoff sein kann, so dass keine großen Kräfte aufgenommen werden können. Die Lage der Versorgungskanäle ist nicht ersichtlich.The material in the joints thus fulfills the function a seal. Furthermore, the material fulfills the function Cover and housing body to hold together. The problem a widening of the housing body by the pressure in the interior is irrelevant in Scripture, as we can see from that the filled material can also be plastic, so that no great powers can be absorbed. The location the supply channels is not visible.

Bei einer in der DE 196 22 519 A1 gezeigten Innenzahnradmaschine greift ein Gehäuseteil mit einem umlaufenden Steg in eine Nut eines Deckels ein. Der Steg erscheint ziemlich schwach. Ihm wird in der Schrift nur eine Funktion hinsichtlich der Abdichtung zwischen Gehäuseteil und Deckel zugeschrieben. Die Versorgungskanäle gehen durch einen Deckel hindurch und münden axial in die Triebwerkskammer.In one shown in DE 196 22 519 A1 internal gear machine engages a housing part with a circumferential ridge in a groove of a lid. The jetty appears pretty weak. He is only a function in the Scriptures attributed to the seal between the housing part and lid. The supply channels go through a lid and open axially into the engine chamber.

Die US 3 494 293 zeigt'eine Spiralpumpe, deren Teile offensichtlich aus Kunststoff bestehen und zusammengeklipst sind.US 3 494 293 shows a spiral pump, the parts of which are obvious Made of plastic and are clipped together.

Aus der DE 1 267 986 ist eine Außenzahnradpumpe bekannt, bei der eine Gehäusezwischenplatte mit zwei Deckeln verschraubt ist. In miteinander fluchtenden Bohrungen der beiden Deckel sind zwei Wellen und gelagert, die die beiden Zahnräder der Pumpe tragen.From DE 1 267 986 an external gear pump is known, in screwed a housing intermediate plate with two lids is. In aligned holes of the two lids are two shafts and stored, which are the two gears of the Carry pump.

Vorteile der ErfindungAdvantages of the invention

Ein Gehäuse einer hydraulischen Arbeitsmaschine mit den Merkmalen des Patentanspruchs 1 oder des unabhängigen Patentanspruchs 11 hat den Vorteil auf, dass mit geringem Fertigungsmehraufwand eine hohe Festigkeit, eine lange Lebensdauer und eine hohe Druckbelastbarkeit des Gehäusekörpers erreicht wird. Gemäß Patentanspruch 1 sind dazu über die Verschraubung und die Anlage von planen Flächen hinausgehende Mittel vorgesehen, die aufgrund ihrer Anordnung einer in Richtung der Versorgungskanäle gerichteten Aufweitung des Gehäusekörpers entgegen wirken. Die Mittel bilden dazu einen Formschluss zwischen den Deckeln und dem Gehäusekörper aus.A housing of a hydraulic machine with the features of claim 1 or the independent claim 11 has the advantage that with low production overhead high strength, long life and a high compressive strength of the housing body is achieved. According to claim 1 are about the screw and the system intended to extend beyond the plane surfaces, the one due to their arrangement one in the direction of the supply channels directed expansion of the housing body Act. The funds form a positive connection between the Lid and the housing body.

Nach den Patentansprüchen 2 und 4 sind die Mittel besonders einfach und kostengünstig darstellbar, wenn sie in Form sacklochartiger Aussparungen in den Deckeln ausgebildet sind, in die der Gehäusekörper abschnittsweise eingesetzt ist oder wenn sie in Form von Passkörpern und zugeordneten Ausnehmungen ausgeführt sind. Eine besonders gute Wirksamkeit der Mittel wird erreicht, wenn die Deckel und der Gehäusekörper aus unterschiedlichen Materialien gefertigt sind und wenn das Material des Deckels eine höhere Festigkeit als die des Gehäusekörpers hat. Mittel in Form von Aussparungen im Deckel eignen sich darüber hinaus besonders gut zur Anordnung von Dichtungen zur Abdichtung der Triebwerkskammer gegenüber der Umgebung.According to claims 2 and 4, the means are special easy and inexpensive to display, if they are in the form of a blind hole Recesses are formed in the lids, in the housing body is used in sections or if they performed in the form of fitting bodies and associated recesses are. A particularly good effectiveness of the means is achieved, if the lid and the housing body made of different materials are manufactured and if the material of the cover a higher Strength than that of the housing body has. Means in shape recesses in the lid are also particularly suitable good for arranging seals to seal the engine chamber opposite the environment.

Nach Anspruch 11 sind die dem Gehäusekörper zugewandten Stirnflächen der Deckel ballig nach außen gewölbt. Beim Anschrauben dieses Deckels an den Gehäusekörper verformt sich dieser im elastischen Bereich, bis die einander zugewandten Stirnflächen plan aneinander anliegen. Die Vorspannkraft beider Bauteile ist aufgrund dieser Verformung der Deckel höher als bei Deckeln mit planen Stirnflächen. Mechanisch wirkt sich diese Maßnahme derart aus, dass zwischen dem Gehäusekörper und dem Deckel höhere Haftreibungskräfte wirksam sind. Eine größere Haftreibung wirkt aufgrund der eingeschränkten Relativbeweglichkeit der Bauteile auch einer betriebsdruckbedingten Aufweitung des Gehäusekörpers entgegen.According to claim 11, the housing body facing end surfaces the lid crowned convexly outwards. When screwing this cover to the housing body deforms this in elastic range until the facing end faces lie flat against each other. The biasing force of both components is due to this deformation of the lid higher than with lids with plan end faces. Mechanically, this measure affects this way from that higher between the housing body and the lid Static friction are effective. A larger stiction works due to the limited relative mobility of the components also an operating pressure-related expansion of the housing body opposite.

Weitere Vorteile oder vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den weiteren Unteransprüchen und aus der folgenden Beschreibung der Ausführungsbeispiele.Further advantages or advantageous developments of the invention emerge from the other subclaims and from the following description of the embodiments.

Zeichnungdrawing

In Figur 1 ist anhand einer Explosionsdarstellung der an sich bekannte Aufbau einer Zahnradmaschine gezeigt. Verschiedene Ausführungsbeispiele der Erfindung sind in den Figuren 2 bis 6 dargestellt. Diese zeigen Deckel eines Gehäuses für eine Zahnradmaschine zum Teil in verschiedenen Ansichten.In Figure 1 is based on an exploded view of the per se known structure of a gear machine shown. Various Exemplary embodiments of the invention are shown in FIGS. 2 to 6 shown. These show cover of a housing for a gear machine partly in different views.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die in Figur 1 in Einzelteilen dargestellte Zahnradmaschine 10 hat ein Gehäuse aus einem Gehäusekörper 14 und aus Deckeln 16 und 18. Der Gehäusekörper 14 ist als Strangpreßprofil ausgebildet und weist eine durchgehende Ausnehmung 12 auf. Letztere ist durch die Deckel 16 und 18 zur Umgebung hin verschlossen. Zur Abdichtung der Deckel 16 und 18 sind an den Stirnseiten des Gehäusekörpers 14 Dichtungen 19 vorgesehen. Einer der Deckel 16 ist als Flanschplatte mit einer Durchgangsöffnung 20 ausgebildet, durch die hindurch eine drehmomentübertragende Welle 22 nach außen ragt. Über die Flanschplatte lässt sich die Zahnradmaschine 10 mit einer An-/Abtriebseinheit, beispielsweise einem Elektromotor oder einem Generator, je nach Betriebsweise der Zahnradmaschine 10 als Pumpe oder Motor, koppeln. Die Deckel 16, 18 sind mit dem Gehäusekörper 14 verschraubt. Dazu sind jeweils vier, im Bereich der Ecken der Deckel ausgebildete Bohrungen 23 vorgesehen, durch die hindurch Befestigungsschrauben 26 in Gewindebohrungen 28 des Gehäusekörpers 14 einschraubbar sind.The illustrated in Figure 1 in parts gearwheel machine 10th has a housing of a housing body 14 and 16 of lids and 18. The housing body 14 is formed as an extruded profile and has a continuous recess 12. The latter is closed by the lid 16 and 18 to the environment. to Seal the lid 16 and 18 are on the front sides of the housing body 14 seals 19 provided. One of the lids 16 is formed as a flange plate with a through hole 20, through which a torque transmitting shaft 22 protrudes outwards. About the flange plate can be the gear machine 10 with an input / output unit, such as a Electric motor or a generator, depending on the operation of the Gear machine 10 as a pump or motor, couple. The lids 16, 18 are bolted to the housing body 14. These are each four, trained in the corners of the lid holes 23 provided through which fastening screws 26 in threaded holes 28 of the housing body 14 can be screwed are.

Die von den Deckeln 16, 18 verschlossene Ausnehmung 12 bildet eine Triebwerkskammer 30 zur Aufnahme des Triebwerks 24. Letzteres besteht aus zwei im Außeneingriff miteinander kämmenden Zahnrädern 32 und 34, die auf der drehmomentübertragenden Welle 22 und einer dazu parallel angeordneten Sekundärwelle 36 geführt sind. Das Zahnrad 34 kann drehfest oder frei beweglich auf der Sekundärwelle angeordnet sein, während das Zahnrad 32 drehfest mit der nach außen führenden Welle 22 verbunden ist, um ein Drehmoment zu übertragen. Die Zahnräder 32 und 34 kämmen zumindest im Einflankeneingriff miteinander.The closed by the covers 16, 18 recess 12 forms an engine chamber 30 for receiving the engine 24. The latter consists of two meshing with each other in external engagement Gears 32 and 34, which on the torque transmitting shaft 22 and a secondary shaft 36 arranged parallel thereto are. The gear 34 can rotate or freely movable be arranged on the secondary shaft while the gear 32nd rotatably connected to the outwardly leading shaft 22, to transmit a torque. The gears 32 and 34 mesh at least in interlocking engagement with each other.

Zur Lagerung der Wellen 22 und 36 sind Lagerbuchsen 38 bis 44 vorhanden, die jeweils paarweise zu beiden Seiten der Zahnräder 32, 34 angeordnet sind. Diese Lagerbuchsen 38 bis 44 dienen darüber hinaus auch zur axialen Abdichtung der von den Zahnrädern 32, 34 und dem Gehäusekörper 14 begrenzten Zahnkammern. Die im wesentlichen zylindrischen Lagerbuchsen 38 bis 44 weisen umfangsseitig jeweils eine Abflachung 46 auf, mit der sie aneinander anliegen. Die Außenkontur eines Paars von Lagerbuchsen 38 bis 44 entspricht dadurch im wesentlichen der Kontur einer Acht. Eine entsprechend geformte Innenkontur der Ausnehmung 12 des Gehäusekörpers 14 ermöglicht eine radiale Abstützung der Lagerbuchsen 38 bis 44 in der Kammer 30. Die Ver- beziehungsweise Entsorgung des.Triebwerkes 24 mit Druckmittel erfolgt über Versorgungskanäle 48 und 50, die an einander gegenüberliegenden und am Umfang des Gehäusekörpers 14 ausgebildeten Flanschflächen 52 enden. An den Flanschflächen 52 sind zur Befestigung entsprechender Anschlußstutzen (nicht gezeichnet) um die Mündungsstelle der Versorgungskanäle 48, 50 herum Gewindebohrungen 51 angebracht. Die Versorgungskanäle 48, 50 verlaufen radial zur Triebwerkskammer 30.For supporting the shafts 22 and 36 are bushings 38 to 44th present, in pairs on both sides of the gears 32, 34 are arranged. These bushings serve 38 to 44 beyond that also for the axial sealing of the gears 32, 34 and the housing body 14 limited tooth chambers. The substantially cylindrical bushings 38 to 44 have on each side of a flattening 46, with each other issue. The outer contour of a pair of bearing bushes 38 to 44 thereby substantially corresponds to the contour of a Eight. A correspondingly shaped inner contour of the recess 12 the housing body 14 allows a radial support of the Bushings 38 to 44 in the chamber 30. The United or Disposal des.Triebwerkes 24 with pressure medium via supply channels 48 and 50, which are located opposite each other and formed on the circumference of the housing body 14 Flange surfaces 52 end. On the flange surfaces 52 are for attachment corresponding connection piece (not drawn) to the mouth of the supply channels 48, 50 around tapped holes 51 attached. The supply channels 48, 50 run radially to the engine chamber 30.

Unter Betriebsbedingungen ist die Triebwerkskammer 30 mit Druckmittel gefüllt und wird bekanntermaßen vom Triebwerk 24 in hochdruck- und niederdruckführende Abschnitte geteilt. Infolge des Hochdrucks weitet sich der Gehäusekörper 14 auf, wobei die maximale Aufweitung im Bereich der Mündungsstelle des hochdruckführenden Versorgungskanals 48, 50 messbar ist. Da der Gehäusekörper 14 aus Aluminium gefertigt ist, bringt er'im Vergleich zu einer aus Stahl oder Grauguss hergestellten Ausführung diesen Druckkräften relativ geringe Widerstandskräfte entgegen. Der hochdruckbeaufschlagte Abschnitt des Gehäusekörpers 14 ist durch den ebenfalls dort angeordneten Versorgungskanal 48, 50 und durch die Gewindebohrungen 51 zur Verankerung etwaiger Anschlußstutzen mechanisch geschwächt. Des weiteren schwankt das Druckniveau im Betriebsfall der Zahnradmaschine 10 periodisch, meist mit hoher Frequenz. Diese Gegebenheiten können zu Rissen und im Extremfall zu Brüchen des Gehäusekörpers 14 führen.Under operating conditions, the engine chamber 30 with Pressure fluid filled and is known to be from the engine 24 in divided high-pressure and low-pressure sections. As a result of the high pressure, the housing body 14 expands, the maximum expansion in the area of the mouth of the high-pressure-carrying Supply channels 48, 50 is measurable. As the case body 14 made of aluminum, he brings in comparison to a version made of steel or gray cast iron counteract these compressive forces relatively low resistance forces. The high pressure loaded portion of the housing body 14 is through the supply channel also arranged there 48, 50 and through the threaded holes 51 for anchoring any Connecting piece mechanically weakened. Furthermore the pressure level fluctuates in the case of operation of the gear machine 10 periodically, usually at high frequency. These circumstances can to cracks and in extreme cases to fractures of the housing body 14 lead.

Die der Erfindung zugrundeliegende Aufgabe besteht demnach darin konstruktiv einfache und preisgünstig realisierbare Maßnahmen vorzuschlagen, die die am Gehäusekörper 14 auftretenden Spannungen zumindest teilweise an die Deckel 16, 18 ableiten um dadurch die Spannungen am Gehäusekörper 14 auf ein unkritisches Niveau zu senken. Aluminium als Material für den Gehäusekörper 14 soll dabei aus fertigungstechnischen Gründen ebenso beibehalten werden wie die äußeren Abmessungen des Gehäuses 11.The problem underlying the invention is therefore in it structurally simple and inexpensive realizable measures suggest that the occurring on the housing body 14 At least partially divert stresses to the covers 16, 18 thereby the voltages on the housing body 14 to a non-critical Lower level. Aluminum as material for the housing body 14 should also be retained for manufacturing reasons be like the outer dimensions of the housing 11th

Zur Lösung dieser Aufgabe wird einerseits vorgeschlagen, Mittel 52 zwischen dem Gehäusekörper 14 und den Deckeln 16, 18 vorzusehen, die einen der Aufweitung des Gehäusekörpers 14 in Richtung der Versorgungskanäle 48, 50 entgegenwirkenden Formschluss bilden.To solve this problem, it is proposed, on the one hand, means 52 to provide between the housing body 14 and the covers 16, 18, the one of the expansion of the housing body 14 in the direction of the supply channels 48, 50 counteracting Form fit.

Beim ersten Ausführungsbeispiel nach Figur 2 handelt es sich bei diesen Mitteln 52 um eine Aussparung 54 an der dem Gehäusekörper 14 zugewandten Seite wenigstens eines Deckels 16, 18. Die Aussparung 54 ist in ihren Abmessungen auf die Außenkontur des Gehäusekörpers 14 derart abgestimmt, dass zumindest in einer Schnittebene X durch die Zahnradmaschine 10, die senkrecht auf den Deckeln steht und in der die Versorgungskanäle 48, 50 verlaufen, Spielfreiheit zwischen Deckel 16, 18 und Gehäusekörper 14 besteht. Durch das Einsetzen des Gehäusekörpers 14 in die Aussparung 54 bildet die die Aussparung 54 umgebende Wandung 56 mit dem Gehäusekörper 14 einen Formschluss, der einer betriebsdruckbedingten Aufweitung des Gehäusekörpers 14 in Richtung der Versorgungskanäle 48, 50 entgegenwirkt. Die Spannungen des Gehäusekörpers 14 werden durch diese Mittel 52 in Zugspannungen des Deckels 16, 18 umgewandelt, so dass das Spannungsniveau am bruchgefährdeten Querschnitt sinkt. Besonders wirksam ist diese Maßnahme, wenn das Material der Deckel 16, 18 eine höhere Festigkeit aufweist als der Gehäusekörper 14. Dabei wäre neben einer höherfesten Aluminiumlegierung beispielsweise auch Stahl oder Grauguss vorstellbar. Bei einer zweiten, in Figur 3 dargestellten Variante sind die vorgeschlagenen Mittel 52 in Form von Stiftlochbohrungen 58 und Passstiften (nicht eingezeichnet) ausgeführt. Die Stiftlochbohrungen 58 sind an der dem Gehäusekörper 14 zugewandten Seite eines Deckels 16, 18 vorgesehen, während die Passstifte am Gehäusekörper 14 verankert sind und aus der Stirnfläche dieses Gehäusekörpers 14 herausragen. Sie erstrecken sich in Längsrichtung der Zahnradmaschine 10. Maßgeblich für die beabsichtigte Wirksamkeit eines derartig ausgeführten Formschlusses zwischen den Deckeln 16, 18 und dem Gehäusekörper 14 ist, dass dieser Formschluss ebenfalls in Richtung der Versorgungskanäle 48, 50 wirkt, das heißt, dass die Stiftlochbohrungen 58 in der in die Figur 3 eingezeichnete Schnittebene X durch die Zahnradmaschine 10 platziert sind, in der auch die am Gehäusekörper 14 nach Figur 1 angeordneten Versorgungskanäle 48, 50 verlaufen. Dadurch kann ein Teil der Spannungen im Gehäusekörper 14 auf den Deckel 16, 18 übertragen werden. Um selbst nicht plastisch verformt zu werden, sollten die Passstifte zumindest annähernd den Durchmesser der Schrauben haben mit denen der Deckel 16, 18 am Gehäusekörper 14 verankert ist. Grundsätzlich ausreichend wäre es, einen derartigen Formschluss auch nur auf der besonders gefährdeten Druckseite des Gehäusekörpers 14 vorzusehen.In the first embodiment of Figure 2 is in these means 52 to a recess 54 on the housing body 14 facing side of at least one lid 16, 18th The recess 54 is in its dimensions on the outer contour the housing body 14 is tuned such that at least in one Section plane X by the gear machine 10, the vertical stands on the lids and in the supply channels 48, 50 run, backlash between cover 16, 18 and housing body 14 exists. By inserting the housing body 14 in the recess 54 forms the wall 54 surrounding the recess 56 with the housing body 14 a positive connection, the one operating pressure-related expansion of the housing body 14 in Direction of the supply channels 48, 50 counteracts. The tensions of the housing body 14 are by these means 52 in Tensile stresses of the lid 16, 18 converted, so that the voltage level at break-prone cross-section sinks. Especially this measure is effective when the material of the lid 16, 18th has a higher strength than the housing body 14. Dabei would be in addition to a higher-strength aluminum alloy, for example Also conceivable steel or cast iron. In a second variant shown in FIG proposed means 52 in the form of pin holes 58 and Dowel pins (not shown) executed. The pinhole holes 58 are on the housing body 14 facing side a lid 16, 18 provided while the dowel pins on the housing body 14 are anchored and out of the face of this Protruding housing body 14. They extend in the longitudinal direction the gear machine 10. Relevant to the intended Effectiveness of such a form fit between the covers 16, 18 and the housing body 14 is that this positive connection also in the direction of the supply channels 48, 50 acts, that is, the pinhole holes 58 in the in the figure 3 drawn sectional plane X by the gear machine 10 are placed, in which also the housing body 14th arranged according to Figure 1 supply channels 48, 50 run. As a result, a part of the voltages in the housing body 14 the lid 16, 18 are transmitted. Not plastic for yourself To be deformed, the dowel pins should at least approximate have the diameter of the screws with which the lid 16, 18 is anchored to the housing body 14. Basically sufficient It would be, such a form fit even on the particular endangered pressure side of the housing body 14 to provide.

Bei einer weiteren Ausführungsform, die in den Figuren 4a und 4b als Draufsicht und als Seitenansicht von Ausschnitten des Gehäusekörpers 14 und eines Deckels 16, 18 dargestellt ist, sind die Mittel 52 als sogenannte Druckstege 60 ausgebildet, die die gedachte und in Verlaufsrichtung der Versorgungskanäle 48, 50 geführte Schnittebene X senkrecht durchkreuzen und somit senkrecht zur Aufweitungsrichtung des Gehäuses 14 ausgerichtet sind. Die Druckstege 60 greifen in dafür vorgesehene Ausnehmungen 62 ein, .welche alternativ am Deckel 16, 18 oder am Gehäusekörper 14 ausgebildet sein können. Die Druckstege 60 lassen sich einteilig an einem dieser beiden Bauteile anformen oder als separate Einlegeteile ausführen. Druckstege 60 haben im Unterschied zu dem im zweiten Ausführungsbeispiel genannten Passstiften einen rechteckigen Querschnitt mit abgerundeten Kanten. Ihr Vorteil besteht unter anderem darin, dass sie aufgrund einer größeren der Aufweitung entgegenwirkenden Anlagefläche geringeren Spannungen ausgesetzt sind.In a further embodiment, which in the figures 4a and 4b as a top view and as a side view of cutouts of Housing body 14 and a lid 16, 18 is shown, the means 52 are designed as so-called pressure webs 60, the imaginary and in the direction of the supply channels 48, 50 guided cutting plane X vertically intersect and thus aligned perpendicular to the expansion direction of the housing 14 are. The pressure ridges 60 engage in recesses provided for this purpose 62, which alternatively on the lid 16, 18 or on the housing body 14 may be formed. Leave the pressure bars 60 integrally molded on one of these two components or as separate inserts. Pressure bars 60 have in difference to the mentioned in the second embodiment dowel pins a rectangular cross-section with rounded edges. Their advantage is, among other things, that they due to a larger of the expansion counteracting bearing surface lower Tensions are exposed.

Bei der in Figur 5 dargestellten Variante sind die Mittel 52 als Textur 64 zwischen den einander zugewandten Seiten der Deckel 16, 18 und dem Gehäusekörper 14 ausgebildet. Diese in Figur 5 nur schematisch dargestellte Textur 64 bildet quasi eine Verzahnung zwischen diesen Bauteilen aus, deren Zähne und Zahnlücken vergleichbar zu den Druckstegen 60 nach Ausführungsbeispiel 3 senkrecht zur Aufweitungsrichtung entlang der Stirnflächen am Gehäusekörper 14 und Deckel 16, 18 ausgerichtet sind. Jedem Zahn ist eine entsprechend geformte Zahnlücke am benachbarten Bauteil zugeordnet.In the variant shown in FIG. 5, the means 52 are as a texture 64 between the facing sides of the lid 16, 18 and the housing body 14 is formed. This in figure 5 only schematically illustrated texture 64 forms a kind of Dovetailing between these components, their teeth and tooth gaps comparable to the pressure webs 60 according to the embodiment 3 perpendicular to the widening direction along the end faces on the housing body 14 and cover 16, 18 are aligned. Each tooth has a correspondingly shaped tooth space on the adjacent one Assigned component.

Beim Ausführungsbeispiel nach den Figuren 6a und 6b, die einen Deckel 16, 18 in der Vorderansicht und der Draufsicht zeigen, ist die dem Gehäusekörper 14 zugewandte Deckelfläche 66 ballig nach außen gewölbt. Die Wölbung muss sich nicht zwangsweise in Richtung der mit Y bezeichneten Hochachse und in der Schnittebene X erstrecken, sondern kann sich auch nur in Richtung der Hochachse Y ausdehnen. Die Richtung Y der Hochachse verläuft senkrecht zur Richtung der Aufweitung des Gehäusekörpers 14 und kreuzt demnach, wie bei den anderen vorgeschlagenen Lösungen, die Schnittebene X. Beim Befestigen der Deckel 16, 18 am Gehäusekörper 14 verformen sich diese im elastischen Bereich bis die einander zugewandten Flächen plan aneinander anliegen. Aufgrund der Verformung kann eine wesentlich höhere Vorspannung zwischen beiden Bauteilen aufgebracht werden. Erhöhte Vorspannungen wirken sich in höheren übertragbaren Haftreibungskräften aus, die wiederum die Relativbeweglichkeit der miteinander verschraubten Bauteile entgegen wirken. Sinngemäß kann die Stirnfläche des Gehäusekörpers 14 alternativ oder zusätzlich zur Stirnseite des Deckels 16,18 ballig nach außen gewölbt sein.In the embodiment of Figures 6a and 6b, a Cover 16, 18 in front view and plan view show the housing surface 14 facing the cover surface 66 is spherical arched outwards. The vault does not necessarily have to be in Direction of the vertical axis marked Y and in the cutting plane X can extend, but also only in the direction of Extend vertical axis Y The direction Y of the vertical axis runs perpendicular to the direction of expansion of the housing body 14 and crosses, as with the other proposed solutions, the sectional plane X. When attaching the lid 16, 18 on the housing body 14 deform this in the elastic range to the facing each other surfaces flat against each other. by virtue of The deformation can be a much higher bias between be applied to both components. Increased biases act themselves in higher transferable static friction forces, which again the relative mobility of the screwed together Counteract components. Correspondingly, the end face of the Housing body 14 alternatively or in addition to the front of the Cover 16.18 be curved convex to the outside.

Claims (11)

  1. Housing of multi-part construction for a hydraulic working machine (10), in particular for a gear machine (pump or motor), with a housing body (14) which, to form a drive-unit chamber (30) receiving a drive unit (24) and capable of being acted upon by operating pressure, is provided with a recess (12) which is open towards at least one end face of the housing body (14), in which housing body are located supply ducts (48, 50) running radially with respect to the drive-unit chamber (30) and issuing on the circumferential surface, and with a cover (16, 18) which closes the drive-unit chamber (30) on an open end face of the housing body (14) and which is pressed onto the end face of the housing body (14) by means of screws (26), characterized in that, in a plane perpendicular to the cover (16, 18) and passing through the supply ducts (48, 50), means (52) are provided which form in the radial direction a positive connection between the housing body (14) and the cover (16, 18).
  2. Housing of multi-part construction according to Claim 1, characterized in that the means (52) provided are, in the cover (16, 18), a clearance (54), into which the housing body (14) can be partially inserted, and in that the clearance (54) is coordinated, free of play, in its dimensions with the outer dimensions of the housing body (14) in the direction of the supply ducts (48, 50).
  3. Housing of multi-part construction according to Claim 2, characterized in that a seal, which seals off the drive-unit chamber (30) with respect to the surroundings, is provided on a wall (56) of the clearance (54) of the cover (16, 18), the said wall facing the circumferential surface of the housing body (14).
  4. Housing of multi-part construction according to Claim 1, characterized in that the means (52) are designed in the form of fitting bodies (60) and of recesses (58, 62) receiving these fitting bodies (60).
  5. Housing of multi-part construction according to Claim 4, characterized in that the fitting bodies are pressure webs (60), the longitudinal axis of which is oriented parallel to the end face and perpendicularly to the radial direction.
  6. Housing of multi-part construction according to Claim 4, characterized in that the fitting bodies are locating pins which run perpendicularly to the cover (16, 18).
  7. Housing of multi-part construction according to Claim 1, characterized in that the means (52) provided are a texture (64) which is formed on the mutually confronting end faces of the covers (16, 18) and of the housing body (14), and in that the texture (64) runs perpendicularly to the radial direction.
  8. Housing of multi-part construction according to one of Claims 1 to 7, characterized in that the at least one cover (16, 18) and the housing body (14) consist of different materials, and in that the material of the cover (16, 18) has a higher strength than the material of the housing body (14).
  9. Housing of multi-part construction according to one of Claims 1 to 8, characterized in that the housing body (14) is designed as an extruded profile with a continuous recess (12), and in that the recess (12) is closed at both ends by covers (16, 18).
  10. Housing of multi-part construction according to one of Claims 1 to 9, characterized in that that end face of the cover (16, 18) which confronts the housing body (14) is curved convexly outwards, and in that the curvature extends at least perpendicularly to the radial direction.
  11. Housing of multi-part construction for a hydraulic working machine (10), in particular for a gear machine (pump or motor), with a housing body (14) which, to form a drive-unit chamber (30) receiving a drive unit (24) and capable of being acted upon by operating pressure, is provided with a recess (12) which is open towards at least one end face of the housing body (14), in which housing body are located supply ducts (48, 50) running radially with respect to the drive-unit chamber (30) and issuing on the circumferential surface, and with a cover (16, 18) which closes the drive-unit chamber (30) on an open end face of the housing body (14) and which is pressed onto the end face of the housing body (14) by means of screws (26), characterized in that that end face of the cover (16, 18) which confronts the housing body (14) is curved convexly outwards, and in that the curvature extends at least perpendicularly to the radial direction.
EP01102964A 2000-03-10 2001-02-08 Multicomponent built casing Expired - Lifetime EP1132619B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10011708A DE10011708A1 (en) 2000-03-10 2000-03-10 Multi-section casing for gear machine has means between casing body and cover which counteracts operating pressure conditioned expansion of casing body taking place in direction of supply channels
DE10011708 2000-03-10

Publications (3)

Publication Number Publication Date
EP1132619A2 EP1132619A2 (en) 2001-09-12
EP1132619A3 EP1132619A3 (en) 2002-06-12
EP1132619B1 true EP1132619B1 (en) 2005-03-02

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EP01102964A Expired - Lifetime EP1132619B1 (en) 2000-03-10 2001-02-08 Multicomponent built casing

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EP (1) EP1132619B1 (en)
DE (2) DE10011708A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006030917B4 (en) 2006-06-26 2018-08-16 Pierburg Gmbh Oil pump and vacuum pump module
DE102014221378B3 (en) * 2014-10-21 2015-09-24 Magna Powertrain Bad Homburg GmbH Device for pressure compensation
CN107762718B (en) * 2016-08-16 2020-03-17 博罗承创精密工业有限公司 Pneumatic motor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1267986B (en) * 1956-03-14 1968-05-09 Bosch Gmbh Robert Gear pump
US3494293A (en) * 1968-06-03 1970-02-10 Arthur R Braun Wobble pump
ZA742498B (en) * 1973-04-27 1975-04-30 Dana Corp Gear pump
DE2510496C3 (en) * 1975-03-11 1978-07-20 Robert Bosch Gmbh, 7000 Stuttgart Gear machine (pump or motor)
DE3324831A1 (en) * 1982-07-24 1984-03-22 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Construction unit
DE19622519A1 (en) * 1996-06-05 1997-12-11 Eckerle Rexroth Gmbh Co Kg Hydraulic machine, especially gearwheel pump

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EP1132619A2 (en) 2001-09-12
EP1132619A3 (en) 2002-06-12
DE10011708A1 (en) 2001-09-20
DE50105438D1 (en) 2005-04-07

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