EP0833056B1 - Method for shaft positioning and gear pump - Google Patents
Method for shaft positioning and gear pump Download PDFInfo
- Publication number
- EP0833056B1 EP0833056B1 EP19970122713 EP97122713A EP0833056B1 EP 0833056 B1 EP0833056 B1 EP 0833056B1 EP 19970122713 EP19970122713 EP 19970122713 EP 97122713 A EP97122713 A EP 97122713A EP 0833056 B1 EP0833056 B1 EP 0833056B1
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- EP
- European Patent Office
- Prior art keywords
- gears
- gear
- housing
- inlet
- pump
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/086—Carter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
Definitions
- the present invention relates to a method according to The preamble of claim 1, a gear pump according to the preamble of claim 3 and a Manufacturing process according to the preamble of Patent claim 7.
- Gear pumps of the simplest type consist of a pair equally large, interlocking gears that enclosed on all sides by a housing.
- the Gears sit on two shafts mounted in the housing, of which - again in the simplest construction - one as Drive shaft out through a shaft seal to the outside is.
- the housing has both sides of the Gearing engagement per one opening for entry and exit of the conveyed medium.
- Gear pumps provide proven pressure build-up units high volumetric efficiency. Accordingly large are therefore also on the gears and thus on the forces acting on the gears carrying waves, which in known manner received by corresponding plain bearings Need to become.
- the plain bearings are from the pumped medium flows through and lubricated. According to storage theory comes it causes the waves in the camp to float when the Operating conditions are chosen correctly, bringing the Bearing load and the bearing capacity are in balance.
- a known gear pump is for example in the Document EP-0 753 678.
- gear pumps have the Disadvantage on that these gear pumps of the rheological and thermal limits of the pumped medium are dependent, i.e., that gear pumps due to the Pumped medium must be designed.
- the present invention is therefore the task based on specifying a method or a gear pump, where the above-mentioned disadvantages do not occur.
- the invention has the following advantages: Radial positioning of the gears via tooth tips and Inner sides of the housing bores is made is a decoupling of the operating conditions of the Achieved delivery medium properties, at least one any remaining dependency of the Operating conditions of the flow behavior of the pumped medium low. Accordingly, the manufacturing costs for Gear pump according to the invention can be considerably reduced.
- Fig. 1 shows as parts of a known gear pump Plain bearing GL with a bearing bore LB, in which a shaft W is supported, wherein the shaft W carries a gear Z, the in a second gear (not shown) engages.
- One Pumped through the gear pump - in the Tooth gaps of gears Z - from an inlet opening (also referred to as the suction side) to the outlet opening (also known as printing page) is promoted, due to the prevailing pressure conditions of the Tooth gap in the storage area according to the in Fig. 1st shown arrow SZ, i. the fluid flows in Slide bearing GL from the gear side ZS to the seal side DS.
- the fluid, the on the sealing side exits from the plain bearing GL, dissipate and otherwise to use or dispose of.
- Fig. 2 shows an inventive gear pump, the a housing G, a housing cover D and two Intermeshing gears Z1 and Z2 exists, with at This embodiment, the first gear Z1 on a shaft AW mounted or forms with this a pump component.
- the shaft AW and thus the gear Z1 are using a motor (not shown) driven.
- the second gear Z2 through the first driven.
- the first Z1 and the second gear Z2 each be powered by a separate motor.
- two Provide shaft bushings of course also be sealed accordingly, with this conventional seals are used.
- Fig. 3 is a gear pump with such three-part pump housing shown, with the Gears Z1 and Z2 receiving housing G front each is provided with a cover D1 or D2.
- Fig. 4 shows a partial cross-section according to Sectional plane A-A through that shown in Fig. 2 Gear pump according to the invention.
- this cross section are Inlet and outlet openings EO and AO for the Conveyed medium FM, the gears Z1 and Z2 with their Tooth heads ZK and partially the housing G of Gear pump according to the invention can be seen.
- the radial positioning of the gears Z1 takes place and Z2 via their tooth tips ZK and the housing G.
- Due the force distribution in steady state operation of the Gear pump is mainly in load ranges LB a adequate lubrication is required because in these Load ranges LB corresponding forces from the housing G must be included.
- an entrance and a Outlet bore for the pumped medium FM are provided, which is substantially perpendicular to the longitudinal axes of Gears Z1 and Z2 are stationary.
- Conceivable and also advantageous opposite to the above variant is a Embodiment in which two or more entrance and / or Outlet openings are provided for the pumped medium FM, because in such an embodiment, the Possibility that the tooth heads ZK also in the field of Can support the inlet and outlet openings.
- These Embodiment has the particular advantage that the edges of the inlet opening are relieved.
- the Conveying medium with respect to the toothed wheels at the front side or dissipated is basically the Possibility that the tooth heads are stored the same way on all sides can be.
- the inlet and / or the outlet opening or the associated inlet and outlet bore Run substantially in this embodiment parallel to the gear axes.
- FIGs. 5A and 5B is a detail of a gear 5A
- a Fig. 5A is a known - provided that slide bearings are provided for the shafts - and FIG. 5B shows an embodiment according to the invention in a section perpendicular to the gear center axis MA show.
- slide bearings are added used to hold the gears in their position. In the case of the gear pumps according to the invention, this takes place Positioning as mentioned in that the tooth heads ZK slide on the inside of the housing bore.
- Coating Since durable materials are expensive, will proposed, instead of a massive construction, the strong claimed parts with a protective layer of the To coat resistant material (so-called Coating).
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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
Die vorliegende Erfindung betrifft ein Verfahren nach dem Oberbegriff des Patentanspruchs 1, eine Zahnradpumpe nach dem Oberbegriff des Patentanspruchs 3 sowie ein Herstellungsverfahren nach dem Oberbegriff des Patentanspruchs 7.The present invention relates to a method according to The preamble of claim 1, a gear pump according to the preamble of claim 3 and a Manufacturing process according to the preamble of Patent claim 7.
Zahnradpumpen einfachster Bauart bestehen aus einem Paar gleich grosser, ineinandergreifender Zahnräder, die allseitig von einem Gehäuse umschlossen werden. Die Zahnräder sitzen auf zwei im Gehäuse gelagerten Wellen, wovon - wiederum in der einfachsten Bauweise - eine als Antriebswelle durch eine Wellendichtung nach aussen geführt ist. Das Gehäuse besitzt beidseitig des Verzahnungseingriffes je eine Öffnung für Ein- und Austritt des Fördermediums. Beim Drehen der Zahnräder füllen sich die aus dem Eingriff kommenden Zahnlücken mit dem einströmenden Fördermedium, das dann den Gehäusewänden entlang auf die Druckseite gebracht wird. Dort verdrängen es die wieder in die Lücken eingreifenden Zähne und stossen es durch die Austrittsöffnung in eine Druckleitung.Gear pumps of the simplest type consist of a pair equally large, interlocking gears that enclosed on all sides by a housing. The Gears sit on two shafts mounted in the housing, of which - again in the simplest construction - one as Drive shaft out through a shaft seal to the outside is. The housing has both sides of the Gearing engagement per one opening for entry and exit of the conveyed medium. When turning the gears fill the coming out of engagement tooth gaps with the incoming fluid then the housing walls is brought along to the pressure side. Displace there it's the teeth getting in the gaps and poking it through the outlet opening in a pressure line.
Zahnradpumpen stellen bewährte Druckaufbauaggregate mit hohem volumetrischem Wirkungsgrad dar. Entsprechend gross sind daher auch die auf die Zahnräder und somit auch auf die die Zahnräder tragenden Wellen wirkenden Kräfte, die in bekannter Weise von entsprechenden Gleitlagern aufgenommen werden müssen. Dabei werden die Gleitlager vom Fördermedium durchströmt und damit geschmiert. Gemäss Lagertheorie kommt es zu einem Aufschwimmen der Wellen im Lager, wenn die Betriebsbedingungen richtig gewählt werden, womit die Lagerlast und die Lagertragfähigkeit im Gleichgewicht sind. Gear pumps provide proven pressure build-up units high volumetric efficiency. Accordingly large are therefore also on the gears and thus on the forces acting on the gears carrying waves, which in known manner received by corresponding plain bearings Need to become. The plain bearings are from the pumped medium flows through and lubricated. According to storage theory comes it causes the waves in the camp to float when the Operating conditions are chosen correctly, bringing the Bearing load and the bearing capacity are in balance.
Eine bekannte Zahnradpumpe ist beispielsweise in der Druckschrift EP-0 753 678 beschrieben.A known gear pump is for example in the Document EP-0 753 678.
Die bekannte Bauweise für Zahnradpumpen weist jedoch den Nachteil auf, dass diese Zahnradpumpen von den rheologischen und thermischen Grenzwerten des Fördermediums abhängig sind, d.h., dass Zahnradpumpen aufgrund des Fördermediums ausgelegt werden müssen.However, the known construction for gear pumps has the Disadvantage on that these gear pumps of the rheological and thermal limits of the pumped medium are dependent, i.e., that gear pumps due to the Pumped medium must be designed.
Es wurde daher bereits vorgeschlagen, lagerlose Zahnradpumpen zu verwenden. Eine solche Zahnradpumpe ist aus der US-3 286 643 bekannt. Allerdings lässt sich die bekannte Zahnradpumpe nur in einem verglichen mit herkömmlichen Zahnradpumpen begrenzten Druckbereich einsetzen.It has therefore already been proposed, bearingless To use gear pumps. Such a gear pump is from US-3,286,643. However, the leaves can be known gear pump only in a compared with conventional gear pumps limited pressure range deploy.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren bzw. eine Zahnradpumpe anzugeben, bei denen die obenerwähnten Nachteile nicht auftreten.The present invention is therefore the task based on specifying a method or a gear pump, where the above-mentioned disadvantages do not occur.
Diese Aufgabe wird durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Massnahmen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sowie eine Zahnradpumpe sind in weiteren Ansprüchen angegeben.This object is achieved by the in the characterizing part of Patent claim 1 specified measures solved. Advantageous embodiments of the invention and a Gear pump are specified in further claims.
Die Erfindung weist folgende Vorteile auf: Indem die radiale Positionierung der Zahnräder über Zahnköpfe und Innenseiten der Gehäusebohrungen vorgenommen wird, wird eine Entkopplung der Betriebsbedingungen von den Fördermediumseigenschaften erreicht, zumindest ist eine allfällige verbleibende Abhängigkeit der Betriebsbedingungen vom Fliessverhalten des Fördermediums gering. Dementsprechend können die Herstellungskosten für erfindungsgemässe Zahnradpumpe erheblich reduziert werden.The invention has the following advantages: Radial positioning of the gears via tooth tips and Inner sides of the housing bores is made is a decoupling of the operating conditions of the Achieved delivery medium properties, at least one any remaining dependency of the Operating conditions of the flow behavior of the pumped medium low. Accordingly, the manufacturing costs for Gear pump according to the invention can be considerably reduced.
Darüber hinaus wird durch den Wegfall der konventionellen Gleitlager die Anzahl der erforderlichen Bauteile erheblich verringert, die Gehäuseabmessungen verkleinert und der Aufbau des Gehäuses insgesamt vereinfacht.In addition, by eliminating the conventional Slide bearing the number of required components considerably reduced, the housing dimensions reduced and the Overall construction of the housing simplified.
Schliesslich können durch ein Abstützen der Zahnräder im Bereich der Eintritts- und Austrittsöffnung die Kanten der Öffnungen entlastet werden.Finally, by supporting the gears in the Area of the entrance and exit opening the edges of the Openings are relieved.
Die Erfindung wird nachfolgend anhand von Zeichnungen beispielsweise näher erläutert. Dabei zeigen
- Fig. 1
- eine in ein Gleitlager eingeführte Welle einer bekannten Zahnradpumpe,
- Fig. 2
- eine erfindungsgemässe Zahnradpumpe mit zweiteiligem Gehäuse in schematischer Darstellung,
- Fig. 3
- eine erfindungsgemässe Zahnradpumpe mit dreiteiligem Gehäuse in schematischer Darstellung,
- Fig. 4
- einen Schnitt entlang A-A durch die erfindungsgemässe Zahnradpumpe dargestellt in Fig. 2 und
- Fig. 5
- Ausführungsformen der Zahnköpfe bei einem bekannten (Fig. 5A) und einem erfindungsgemässen Zahnrad (Fig. 5B).
- Fig. 1
- an inserted into a plain bearing shaft of a known gear pump,
- Fig. 2
- an inventive gear pump with two-part housing in a schematic representation,
- Fig. 3
- a gear pump according to the invention with three-part housing in a schematic representation,
- Fig. 4
- a section along AA by the inventive gear pump shown in Fig. 2 and
- Fig. 5
- Embodiments of the tooth tips in a known (Fig. 5A) and a gear according to the invention (Fig. 5B).
Fig. 1 zeigt als Teile einer bekannten Zahnradpumpe ein Gleitlager GL mit einer Lagerbohrung LB, in der eine Welle W gelagert ist, wobei die Welle W ein Zahnrad Z trägt, das in ein zweites Zahnrad (nicht dargestellt) eingreift. Ein Fördermedium, das durch die Zahnradpumpe - und zwar in den Zahnlücken der Zahnräder Z - von einer Eintrittsöffnung (auch etwa als Saugseite bezeichnet) zur Austrittsöffnung (auch etwa als Druckseite bezeichnet) gefördert wird, gelangt aufgrund der herrschenden Druckverhältnisse von der Zahnlücke in den Lagerbereich gemäss dem in Fig. 1 dargestellten Pfeil SZ, d.h. das Fördermedium fliesst im Gleitlager GL von der Zahnradseite ZS zur Dichtungsseite DS. Wie dieser letztgenannte Begriff bereits zum Ausdruck bringt, ist nach dem Gleitlager GL in Richtung vom Zahnrad Z wegweisend eine Dichtung notwendig (in Fig. 1 nicht dargestellt), damit nicht beliebig viel Fördermaterial über das Gleitlager GL abfliessen kann. Neben dem Gleitlager GL und den Dichtungen auf der Dichtungsseite DS sind darüber hinaus weitere Massnahmen erforderlich, damit eine hinreichende Schmierung der Gleitlager GL gewährleistet ist. So ist darauf zu achten, dass das in das Gleitlager GL fliessende Fördermedium ständig erneuert wird. Dazu ist bekannt, einen Entlastungskanal, der einen Zwischenraum zwischen Gleitlager und Dichtung mit der Saugseite der Zahnradpumpe verbindet, vorzusehen. Damit wird das durch das Gleitlager GL fliessende Fördermedium wiederum zur Eintrittsöffnung der Zahnradpumpe zurück transportiert.Fig. 1 shows as parts of a known gear pump Plain bearing GL with a bearing bore LB, in which a shaft W is supported, wherein the shaft W carries a gear Z, the in a second gear (not shown) engages. One Pumped through the gear pump - in the Tooth gaps of gears Z - from an inlet opening (also referred to as the suction side) to the outlet opening (also known as printing page) is promoted, due to the prevailing pressure conditions of the Tooth gap in the storage area according to the in Fig. 1st shown arrow SZ, i. the fluid flows in Slide bearing GL from the gear side ZS to the seal side DS. As the latter term already expressed brings, after the sliding bearing GL in the direction of the gear Z pointing a seal necessary (not in Fig. 1) shown), so that not as much material over the plain bearing GL can drain. In addition to the sliding bearing GL and the seals on the gasket side DS are over it In addition, further action is required to allow a sufficient lubrication of plain bearings GL guaranteed is. So make sure that in the plain bearing GL flowing medium is constantly renewed. Is to known, a discharge channel, a gap between plain bearing and seal with the suction side of the Gear pump connects, provide. This is going through the sliding bearing GL flowing fluid in turn to Inlet opening of the gear pump transported back.
Als weitere Variante ist bekannt, das Fördermedium, das dichtungsseitig aus dem Gleitlager GL austritt, abzuführen und anderweitig zu verwenden bzw. zu entsorgen. As a further variant is known, the fluid, the on the sealing side exits from the plain bearing GL, dissipate and otherwise to use or dispose of.
Beide Varianten sind mit nicht unbedeutenden baulichen Aufwendungen verbunden, was sich im Preis entsprechend bemerkbar macht.Both variants are with not insignificant structural Expenses associated, resulting in the price accordingly makes noticeable.
Fig. 2 zeigt eine erfindungsgemässe Zahnradpumpe, die aus einem Gehäuse G, einem Gehäusedeckel D und zwei ineinandergreifende Zahnräder Z1 und Z2 besteht, wobei bei dieser Ausführungsform das erste Zahnrad Z1 auf einer Welle AW montiert bzw. mit dieser ein Pumpenbestandteil bildet. Die Welle AW und damit das Zahnrad Z1 werden mit Hilfe eines Motors (nicht dargestellt) angetrieben. In dieser Ausführungsform wird das zweite Zahnrad Z2 durch das erste angetrieben. In einer weiteren Ausführungsform ist vorgesehen, dass das erste Z1 und das zweite Zahnrad Z2 je von einem separaten Motor angetrieben werden. In diesem Fall sind im Gehäuse G bzw. im Gehäusedeckel D zwei Wellendurchführungen vorzusehen, die selbstverständlich auch entsprechend abzudichten sind, wobei hierzu herkömmliche Dichtungen zur Anwendung kommen.Fig. 2 shows an inventive gear pump, the a housing G, a housing cover D and two Intermeshing gears Z1 and Z2 exists, with at This embodiment, the first gear Z1 on a shaft AW mounted or forms with this a pump component. The shaft AW and thus the gear Z1 are using a motor (not shown) driven. In this Embodiment, the second gear Z2 through the first driven. In a further embodiment provided that the first Z1 and the second gear Z2 each be powered by a separate motor. In this Case are in the housing G or in the housing cover D two Provide shaft bushings, of course also be sealed accordingly, with this conventional seals are used.
Der Vollständigkeit halber wird darauf hingewiesen, dass - wie bei den meisten bekannten Zahnradpumpen - auch bei der vorliegenden erfindungsgemässen Zahnradpumpe sogenannte Quetschnuten vorgesehen sind. Diese befinden sich in den entsprechenden Gehäusedeckeln bzw. in den entsprechenden Wänden des Pumpengehäuses und ermöglichen den Druckausgleich im Verzahnungsbereich. For the sake of completeness, it should be noted that: as with most known gear pumps - also in the present inventive gear pump so-called Quetschnuten are provided. These are located in the corresponding housing covers or in the corresponding Walls of the pump housing and allow the Pressure equalization in the gearing area.
Im Unterschied zur bekannten Zahnradpumpe gemäss Fig. 1 sind bei der erfindungsgemässen Zahnradpumpe keine Gleitlager erforderlich. Das Positionieren in radialer Richtung erfolgt erfindungsgemäss über die Zahnköpfe und Gehäusebohrungen, d.h. die Lagerung findet zwischen den Zahnköpfen und den die Zahnräder aufnehmenden Gehäusebohrungen statt.In contrast to the known gear pump according to FIG. 1 are in the inventive gear pump no Plain bearing required. Positioning in radial Direction according to the invention via the tooth tips and Housing bores, i. the storage takes place between the Tooth tips and the gears receiving Housing bores instead.
Das Positionieren in axialer Richtung erfolgt über den Deckel D und die gegenüberliegende Gehäusewand. Anstelle einer in Fig. 2 dargestellten Gehäusebohrung, in welche die Zahnräder Z1 und Z2 einschiebbar sind, ist auch eine durchgehende Bohrung denkbar, wobei zwei Deckel D, nämlich je einen pro Stirnseite, vorzusehen sind. Damit besteht das Pumpengehäuse aus insgesamt drei Teilen.The positioning in the axial direction is done via the Cover D and the opposite housing wall. Instead of a housing bore shown in Fig. 2, in which the Gears Z1 and Z2 are insertable, is also a through hole conceivable, with two cover D, namely each one per front side, are provided. This is the case Pump housing from a total of three parts.
In Fig. 3 ist eine Zahnradpumpe mit einem solchen dreiteiligen Pumpengehäuse dargestellt, wobei das die Zahnräder Z1 und Z2 aufnehmende Gehäuse G stirnseitig je mit einem Deckel D1 bzw. D2 versehen ist.In Fig. 3 is a gear pump with such three-part pump housing shown, with the Gears Z1 and Z2 receiving housing G front each is provided with a cover D1 or D2.
Fig. 4 zeigt einen ausschnittsweisen Querschnitt gemäss Schnittebene A-A durch die in Fig. 2 dargestellte erfindungsgemässe Zahnradpumpe. In diesem Querschnitt sind Eintritts- und Austrittsöffnungen EO bzw. AO für das Fördermedium FM, die Zahnräder Z1 und Z2 mit deren Zahnköpfen ZK und teilweise das Gehäuse G der erfindungsgemässen Zahnradpumpe ersichtlich. Wie bereits erwähnt, erfolgt das radiale Positionieren der Zahnräder Z1 und Z2 über deren Zahnköpfe ZK und das Gehäuse G. Aufgrund der Kraftverteilung im stationären Betriebszustand der Zahnradpumpe ist vor allem in Lastbereichen LB eine ausreichende Schmierung erforderlich, da in diesen Lastbereichen LB entsprechende Kräfte vom Gehäuse G aufgenommen werden müssen.Fig. 4 shows a partial cross-section according to Sectional plane A-A through that shown in Fig. 2 Gear pump according to the invention. In this cross section are Inlet and outlet openings EO and AO for the Conveyed medium FM, the gears Z1 and Z2 with their Tooth heads ZK and partially the housing G of Gear pump according to the invention can be seen. As already mentioned, the radial positioning of the gears Z1 takes place and Z2 via their tooth tips ZK and the housing G. Due the force distribution in steady state operation of the Gear pump is mainly in load ranges LB a adequate lubrication is required because in these Load ranges LB corresponding forces from the housing G must be included.
Aus Fig. 4 ist ersichtlich, dass eine Eintritts- und eine Austrittsbohrung für das Fördermedium FM vorgesehen sind, die im wesentlichen senkrecht auf den Längsachsen der Zahnräder Z1 und Z2 stehen. Denkbar und auch vorteilhaft gegenüber der vorstehend genannten Variante ist eine Ausführungsform, bei der zwei oder mehr Eintritts- und/oder Austrittsöffnungen für das Fördermedium FM vorgesehen sind, denn bei einer solchen Ausführungsform besteht die Möglichkeit, dass sich die Zahnköpfe ZK auch im Bereich der Eintritts- und Austrittsöffnungen abstützen können. Diese Ausführungsform weist insbesondere den Vorteil auf, dass die Kanten der Eintrittsöffnung entlastet werden.From Fig. 4 it can be seen that an entrance and a Outlet bore for the pumped medium FM are provided, which is substantially perpendicular to the longitudinal axes of Gears Z1 and Z2 are stationary. Conceivable and also advantageous opposite to the above variant is a Embodiment in which two or more entrance and / or Outlet openings are provided for the pumped medium FM, because in such an embodiment, the Possibility that the tooth heads ZK also in the field of Can support the inlet and outlet openings. These Embodiment has the particular advantage that the edges of the inlet opening are relieved.
In einer weiteren Ausführungsform der Erfindung wird das Fördermedium in bezug auf die Zahnräder stirnseitig zu- bzw. abgeführt. Damit besteht grundsätzlich die Möglichkeit, dass die Zahnköpfe allseitig gleich gelagert werden können. Die Eintritts- und/oder die Austrittsöffnung bzw. die dazugehörende Einlauf- und Auslaufbohrung verlaufen bei dieser Ausführungsform im wesentlichen parallel zu den Zahnradachsen.In a further embodiment of the invention, the Conveying medium with respect to the toothed wheels at the front side or dissipated. This is basically the Possibility that the tooth heads are stored the same way on all sides can be. The inlet and / or the outlet opening or the associated inlet and outlet bore Run substantially in this embodiment parallel to the gear axes.
In den Fig. 5A und 5B wird ausschnittsweise je ein Zahnrad dargestellt, wobei Fig. 5A eine bekannte - vorausgesetzt, dass Gleitlager für die Wellen vorgesehen sind - und Fig. 5B eine erfindungsgemässe Ausführungsform in einem Schnitt senkrecht zur Zahnradmittelachse MA zeigen. Bekanntlich werden bei herkömmlichen Zahnradpumpen Gleitlager dazu verwendet, um die Zahnräder in ihrer Position zu halten. Bei den erfindungsgemässen Zahnradpumpen erfolgt das Positionieren wie erwähnt dadurch, dass die Zahnköpfe ZK auf der Innenseite der Gehäusebohrung gleiten.In Figs. 5A and 5B is a detail of a gear 5A, a Fig. 5A is a known - provided that slide bearings are provided for the shafts - and FIG. 5B shows an embodiment according to the invention in a section perpendicular to the gear center axis MA show. generally known In conventional gear pumps slide bearings are added used to hold the gears in their position. In the case of the gear pumps according to the invention, this takes place Positioning as mentioned in that the tooth heads ZK slide on the inside of the housing bore.
Es hat sich gezeigt, dass die bekannte Anordnung der Zahnköpfe ZK gemäss Fig. 5A bei der Realisierung der Erfindung verwendbar sind, sofern die Druckdifferenz zwischen Druck- und Saugseite der Zahnradpumpe nicht übermässig hoch ist oder sofern ein speziell hartes Material für die Zahnköpfe ZK und die beanspruchten Gehäuseteile verwendet wird.It has been shown that the known arrangement of Tooth heads ZK according to Fig. 5A in the realization of Invention are usable, provided that the pressure difference not between the pressure and suction side of the gear pump is excessively high or if a specially hard Material for the tooth heads ZK and the claimed Housing parts is used.
In Weiterführung der Erfindung wird vorgeschlagen, die Zahnkopfbreite KD zu erhöhen, damit die Gleitfläche pro Zahnkopf erhöht werden kann. Dies ist in Fig. 5B dargestellt. Entsprechend lassen sich derart ausgebildete Zahnradpumpen bei einer höheren geforderten Druckdifferenz zwischen Saug- und Druckseite einsetzen. Wird überdies für die Zahnköpfe ZK bzw. die durch das Positionieren beanspruchten Gehäuseteile ein Material eingesetzt, das äusserst widerstandsfähig ist, so zeichnen sich derart ausgebildete Zahnradpumpen durch einen grossen Einsatzbereich aus. In continuation of the invention is proposed, the To increase tooth head width KD, so that the sliding surface per Tooth head can be increased. This is in Fig. 5B shown. Accordingly, such trained Gear pumps at a higher required pressure difference Insert between suction and pressure side. Will also for the tooth heads ZK or by the positioning claimed housing parts a material used, the is extremely resistant, it is characterized in such a way trained gear pumps by a large Field of application.
Da widerstandsfähige Materialien teuer sind, wird vorgeschlagen, anstelle einer massiven Bauweise die stark beanspruchten Teile mit einer Schutzschicht aus dem widerstandsfähigen Material zu überziehen (sogenanntes Coating).Since durable materials are expensive, will proposed, instead of a massive construction, the strong claimed parts with a protective layer of the To coat resistant material (so-called Coating).
Claims (7)
- Method for positioning of gears of a gear pump comprising a pump housing (G; D; D1, D2) with at least two borings for receiving at least two gears (Z1, Z2) with intermeshing gear teeth (ZK), and comprising an inlet (EO) and an outlet opening (AO) for the medium (FM) being conveyed, the radial positioning of the gears (Z1, Z2) taking place via the gear teeth (ZK) and the inside of the borings in the pump housing (G; D; D1, D2), characterized in that the gears (Z1, Z2) are supported for further radial positioning in the area of the inlet (EO) and the outlet opening (AO) by providing two or more inlet (EO) and/or outlet openings (AO) for the medium (FM) being conveyed.
- Method according to claim 1, characterized in that the radial positioning takes place via at least one housing cover (D; D1, D2).
- Gear pump for conveying a liquid medium (FM), the gear pump comprising a pump housing (G; D; D1, D2) with at least two borings with at least two intermeshing gears (Z1, Z2) with gear teeth (ZK) and an inlet (EO) and an outlet opening (AO) for the medium (FM) being conveyed, and the gears (Z1, Z2) being radially supported in the housing (G), the bearing surfaces consisting, on the one hand, of areas of gear teeth (ZK) and, on the other hand, of areas inside the borings in the pump housing (G; D; D1, D2),
characterized in that the inlet (EO) and the outlet opening (AO) are divided in order to also guarantee a support of the gears (Z1, Z2) in the area of the inlet (EO) and the outlet opening (AO). - Gear pump according to claim 3, characterized in that the gears (Z1, Z2) are axially supported in the pump housing (G; D; D1, D2), the bearing surfaces consisting, on the one hand, of areas of the pump housing (G; D; D1, D2), at least one housing cover (D; D1, D2) and, on the other hand, of areas on the front side of the gears (Z1, Z2).
- Gear pump according to one of the claims 3 to 4, characterized in that an extremely resistant material is used for the bearing surfaces on the gear teeth (ZK) and/or on the pump housing (G; D; D1, D2), the heavily stressed areas being particularly coated by a layer of this material.
- Gear pump according to one of the claims 3 to 5, characterized in that the inlet (EO) and/or the outlet opening (AO) are provided on the front side in relation to the gears (Z1, Z2).
- Method for manufacturing a gear pump comprising a pump housing (G; D; D1, D2) with at least two borings receiving at least two gears (Z1, Z2) with intermeshing gear teeth (ZK), and comprising an inlet (EO) and an outlet opening (AO) for the medium (FM) being conveyed, the radial positioning of the gears (Z1, Z2) taking place via the gear teeth (ZK) and the inside of the borings in the pump housing (G; D; D1, D2), characterized in that the gears (Z1, Z2) are supported in the area of the inlet (EO) and the outlet opening (AO) for further radial positioning, in that two or more inlets (EO) and/or outlet openings (AO) are provided for the medium (FM) being conveyed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19970122713 EP0833056B1 (en) | 1997-12-23 | 1997-12-23 | Method for shaft positioning and gear pump |
| DE59711969T DE59711969D1 (en) | 1997-12-23 | 1997-12-23 | Shaft positioning method and a gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19970122713 EP0833056B1 (en) | 1997-12-23 | 1997-12-23 | Method for shaft positioning and gear pump |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0833056A2 EP0833056A2 (en) | 1998-04-01 |
| EP0833056A3 EP0833056A3 (en) | 1998-07-15 |
| EP0833056B1 true EP0833056B1 (en) | 2004-09-29 |
Family
ID=8227861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19970122713 Expired - Lifetime EP0833056B1 (en) | 1997-12-23 | 1997-12-23 | Method for shaft positioning and gear pump |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0833056B1 (en) |
| DE (1) | DE59711969D1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE323573C (en) * | 1918-04-23 | 1920-07-31 | Fried Krupp Akt Ges | Gear pump for high speeds |
| US2626570A (en) * | 1947-06-13 | 1953-01-27 | Euclid Road Machinery Co | Floating gear pump |
| US3286643A (en) * | 1963-10-14 | 1966-11-22 | Dowty Technical Dev Ltd | Gear pumps and motors |
| FR2163935A5 (en) * | 1971-12-07 | 1973-07-27 | Rhone Poulenc Sa | |
| US4386893A (en) * | 1981-05-04 | 1983-06-07 | Deere & Company | Gear pump or motor with a shaftless gear |
| DE3312868C2 (en) * | 1983-04-09 | 1986-03-20 | Glyco-Antriebstechnik Gmbh, 6200 Wiesbaden | Hydraulic pump |
| EP0753678B1 (en) | 1996-07-17 | 2003-04-23 | Maag Pump Systems Textron AG | Sliding-contact bearing for a shaft |
-
1997
- 1997-12-23 EP EP19970122713 patent/EP0833056B1/en not_active Expired - Lifetime
- 1997-12-23 DE DE59711969T patent/DE59711969D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59711969D1 (en) | 2004-11-04 |
| EP0833056A3 (en) | 1998-07-15 |
| EP0833056A2 (en) | 1998-04-01 |
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