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EP0464261A1 - Fuel supply pump - Google Patents

Fuel supply pump Download PDF

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Publication number
EP0464261A1
EP0464261A1 EP90124382A EP90124382A EP0464261A1 EP 0464261 A1 EP0464261 A1 EP 0464261A1 EP 90124382 A EP90124382 A EP 90124382A EP 90124382 A EP90124382 A EP 90124382A EP 0464261 A1 EP0464261 A1 EP 0464261A1
Authority
EP
European Patent Office
Prior art keywords
intermediate plate
cover
base plate
unit according
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.)
Granted
Application number
EP90124382A
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German (de)
French (fr)
Other versions
EP0464261B1 (en
Inventor
Norbert Fernau
Helmut Kohlhaas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mannesmann VDO AG
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Mannesmann VDO AG
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Publication date
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Publication of EP0464261A1 publication Critical patent/EP0464261A1/en
Application granted granted Critical
Publication of EP0464261B1 publication Critical patent/EP0464261B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • 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

Definitions

  • the invention relates to a delivery unit, in particular for delivering fuel, with an electric drive motor and a pump unit coupled to it, which consists of a base plate provided with an inlet opening, an adjoining intermediate plate with a recess in which the circumferential, made of a sintered metal existing pump parts, in particular a gerotor, are rotatably mounted, and a cover resting on the intermediate plate with an outlet opening and a passage opening for the shaft of the drive motor.
  • Conveyor units of this type are already known, in which the base plate, the intermediate plate and the cover consist of a sintered steel.
  • the rotating pump parts arranged rotatably in the recess of the intermediate plate - this can be a plurality of rollers if the pump unit is designed as a roller cell pump, or a pair of gearwheels which comprise an internally toothed and an externally toothed gearwheel, a so-called internal gear pump, or else also around two externally toothed gears of a conventional gear pump - also consist of sintered steel.
  • the base plate, the intermediate plate and the cover are subjected to an oxidizing steam treatment, as a result of which a hard oxide skin is formed on these parts, which significantly reduces the wear between the different pump parts.
  • the smallest possible axial gaps between the rotating pump parts and the cover or the base plate are aimed for.
  • Appropriate treatment of the sintered metal parts enables unevenness of up to 5 ⁇ m to be achieved. Due to the required steam treatment, however, the material processed in this way warps that are in the order of 8-10 ⁇ m. Since the oxide layer created by the steam treatment is only approx. 5-6 ⁇ m thick, only a slight improvement in the unevenness can be achieved by reworking the parts subjected to the steam treatment.
  • the material pairing according to the invention and the formation of the end faces of the base plate and the cover also lead to better hot running properties of the pump. This is essentially due to the fact that, as already mentioned, the axial gaps can be realized in a particularly small manner and thus vapor bubbles present in the hot fuel do not settle there, but rather can be transported out of the pump chamber by the movable pump parts.
  • the desired smooth surface of the relevant end faces of the base plate and the cover can be obtained by grinding, lapping or honing these end faces. If, in the following, we refer to ground surfaces, honed or lapped surfaces or surfaces with an unevenness of less than 1 ⁇ m are also to be understood in the sense of this invention.
  • Oxide ceramics in particular metal oxide ceramics, are most suitably used as the ceramic material, although other ceramics such as e.g. Silicon oxide ceramics and the like can be used, provided that they only have the mechanical strength required for the present application and can be provided with a ground surface with an unevenness of less than 1 minute.
  • the pump unit according to the invention can be manufactured with less effort than the known pumps for this reason alone. This effort can be further reduced by also producing the intermediate plate from ceramic material.
  • the radial dimensions of the pump unit must be chosen larger than in the case of an intermediate plate made of sintered material, since otherwise the mechanical properties of the pump unit deteriorate.
  • the use of an intermediate plate made of ceramic material has the advantage that the hot running properties of the pump unit are further improved, which is due to the fact that the ceramic has a smaller linear coefficient of thermal expansion than sintered steel.
  • Ceramics usually have a coefficient of thermal expansion between 6 and 8 x 10- 6 1 / * C, while sintered steel has a coefficient of around 12 x 10- 6 1 / "C.
  • the sintered steel expands more than the ceramic one Intermediate plate, so that with increasing heating of the pump unit the axial gaps between the moving pump parts and the base plate or the cover become smaller and smaller 4 to 6 x 10- 6 1 / ⁇ C.
  • Synthetic carbons are essentially a mixture of plastic or synthetic resin and graphite which is sintered together, hard carbons are essentially pressed and fired graphite.
  • the pump unit consists of a base plate 1, an intermediate plate 2 and a cover 3, which are held together by means of four screws 4 and associated nuts 5.
  • the base plate 1 is provided with a crescent-shaped inlet opening 6 for the medium to be conveyed, i.e. for the fuel to be delivered, and provided with a guide bushing 7, the inner bore 8 of which serves to receive the drive shaft of the electric drive motor (not shown) and whose inwardly projecting extension 9 is designed to support the outer gear 10 of the gerotor 11.
  • the lid 3 is provided with a passage opening 12 for the drive shaft with an outlet opening 13 for the medium to be conveyed.
  • the cover 3 and the base plate 1 each consist of aluminum oxide ceramic.
  • the end faces of the base plate 1 and the cover 3 facing the intermediate plate 2 are machined to a mirror finish.
  • the intermediate plate 2 contains a circular recess 14 which is arranged eccentrically to the central axis 15 of the pump unit by an amount a.
  • the external gear 10 is provided on its end face facing the cover 3 with axial teeth 17 which are arranged in corresponding recesses of a counterpart seated on the drive shaft of the drive motor.
  • the two interlocking parts thus form a tooth-like coupling.
  • the intermediate plate 2 can also be made of sintered metal.
  • at least the inner surface of the circular recess is steam-treated, so that a hard sintered metal oxide forms there, which reduces the wear between the internal gear 16 and the intermediate plate 2.
  • Such a steam treatment can be dispensed with if the intermediate plate 2 is made of ceramic or of hard coal or synthetic carbon. In these cases, however, the intermediate plate 2 should be enlarged radially for reasons of strength; otherwise there is a risk of the holes 18, 19 or 20 breaking out.

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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)

Abstract

Delivery unit, particularly for delivering fuel, with an electric drive motor and, coupled to this, a pump unit which comprises a base plate, an intermediate plate with a recess for the rotating pump parts and a cover, at least the base plate and the cover being composed of a ceramic material and the end faces of the base plate and the cover facing the intermediate plate having ground surfaces.

Description

Die Erfindung bezieht sich auf ein Förderaggregat, insbesondere zum Fördern von Kraftstoff, mit einem elektrischen Antriebsmotor und einer mit diesem gekuppelten Pumpeneinheit, die aus einer mit einer Einlaßöffnung versehenen Grundplatte, einer daran anliegenden Zwischenplatte mit einer Ausnehmung, in der die umlaufenden, aus einem Sintermetall bestehenden Pumpenteile, insbesondere ein Gerotor, drehbar gelagert sind, und einem auf der Zwischenplatte aufliegenden Deckel mit einer Auslassöffnung und einer Durchtrittsöffnung für die Welle des Antriebsmotors.The invention relates to a delivery unit, in particular for delivering fuel, with an electric drive motor and a pump unit coupled to it, which consists of a base plate provided with an inlet opening, an adjoining intermediate plate with a recess in which the circumferential, made of a sintered metal existing pump parts, in particular a gerotor, are rotatably mounted, and a cover resting on the intermediate plate with an outlet opening and a passage opening for the shaft of the drive motor.

Es sind bereits Förderaggregate dieser Gattung bekannt, bei denen die Grundplatte, die Zwischenplatte und der Deckel aus einem Sinterstahl bestehen. Die in der Ausnehmung der Zwischenplatte drehbar angeordneten umlaufenden Pumpenteile - es kann sich hierbei um eine Vielzahl von Rollen handeln, wenn die Pumpeneinheit als Rollenzellenpumpe ausgebildet ist, oder um ein Zahnradpaar, das ein innenverzahntes und ein außenverzahntes Zahnrad umfaßt, eine sogenannte Innenzahnradpumpe, oder aber auch um zwei außen verzahnte Zahnräder einer üblichen Zahnradpumpe - bestehen ebenfalls aus Sinterstahl. Um den Verschleiß zwischen den drehenden Pumpenteilen und den feststehenden Pumpenteilen gering zu halten werden die Grundplatte, die Zwischenplatte und der Deckel einer oxydierenden Dampfbehandlung unterworfen, wodurch sich auf diesen Teilen eine harte Oxydhaut bildet, durch die der Verschleiß zwischen den verschiedenen Pumpenteilen wesentlich verringert wird.Conveyor units of this type are already known, in which the base plate, the intermediate plate and the cover consist of a sintered steel. The rotating pump parts arranged rotatably in the recess of the intermediate plate - this can be a plurality of rollers if the pump unit is designed as a roller cell pump, or a pair of gearwheels which comprise an internally toothed and an externally toothed gearwheel, a so-called internal gear pump, or else also around two externally toothed gears of a conventional gear pump - also consist of sintered steel. In order to keep the wear between the rotating pump parts and the fixed pump parts low, the base plate, the intermediate plate and the cover are subjected to an oxidizing steam treatment, as a result of which a hard oxide skin is formed on these parts, which significantly reduces the wear between the different pump parts.

Um einen möglichst hohen Wirkungsgrad der Pumpe zu erreichen, werden kleinstmögliche Axialspalte zwischen den drehenden Pumpenteilen und dem Deckel bzw. der Grundplatte angestrebt. Durch entsprechende Behandlung der Sintermetallteile lassen sich zwar Unebenheiten bis zu 5um erreichen. Aufgrund der erforderlichen Dampfbehandlung entstehen jedoch in dem so bearbeiteten Material Verwerfungen, die in der Größenordnung von 8-10um liegen. Da die durch die Dampfbehandlung entstehende Oxydschicht nur ca. 5-6um dick ist, kann auch durch eine Nachbearbeitung der der Dampfbehandlung unterworfenen Teile nur eine geringfügige Verbesserung der Unebenheiten erzielt werden.In order to achieve the highest possible efficiency of the pump, the smallest possible axial gaps between the rotating pump parts and the cover or the base plate are aimed for. Appropriate treatment of the sintered metal parts enables unevenness of up to 5 μm to be achieved. Due to the required steam treatment, however, the material processed in this way warps that are in the order of 8-10 μm. Since the oxide layer created by the steam treatment is only approx. 5-6 µm thick, only a slight improvement in the unevenness can be achieved by reworking the parts subjected to the steam treatment.

Ein weiterer Nachteil dieser bekannten Pumpen besteht darin, daß sich der Wirkungsgrad aufgrund des auch bei einer Materialpaarung von Sinterstahl und Sinterstahloxyd entstehenden Verschleißes mit zunehmender Lebensdauer verschlechtert.Another disadvantage of these known pumps is that the efficiency deteriorates with increasing service life due to the wear that occurs even when sintered steel and sintered steel oxide are combined.

Diese Schwierigkeiten und Nachteile sollen durch die Erfindung beseitigt werden. Es ist daher Aufgabe der Erfindung, ein Förderaggregat mit einer Pumpeneinheit zu schaffen, die einen möglichst hohen Wirkungsgrad hat, der sich auch während der Lebensdauer des Förderaggregats, wenn überhaupt, nur in engen Grenzen verschlechtert. Darüber hinaus soll die Erhöhung des Wirkungsgrades mit möglichst wenig Aufwand einhergehen.These difficulties and disadvantages are intended to be eliminated by the invention. It is therefore an object of the invention to provide a delivery unit with a pump unit which has the highest possible efficiency, which deteriorates, if at all, only within narrow limits even during the service life of the delivery unit. In addition, the increase in efficiency should go hand in hand with as little effort as possible.

Diese Aufgabe wird ausgehend von einem Förderaggregat der eingangs beschriebenen Gattung erfindungsgemäß dadurch gelöst, daß zumindest die Grundplatte und der Deckel aus einem keramischen Material bestehen und daß die Grundplatte und der Deckel jeweils auf ihre der Zwischenplatte zugewandten Stirnseite zumindest im Bereich der umlaufenden Pumpenteile mit geschliffenen Oberflächen versehen sind.This object is achieved on the basis of a conveyor unit of the type described in the introduction in that at least the base plate and the cover consist of a ceramic material and that the base plate and the cover each have a ground surface on their end face facing the intermediate plate, at least in the area of the rotating pump parts are provided.

Durch die Verwendung keramischen Materials für die Grundplatte und den Deckel und die Ausbildung der der Zwischenplatte zugewandten Stirnseite dieser Teile mit einer geschliffenen Oberfläche lassen sich Unebenheiten von weniger als 1tim erreichen und damit äußerst geringe axiale Luftspalte bei entsprechendem Aufbau der Pumpeneinheit. Eine Nachbehandlung der Grundplatte und des Deckels ist nicht erforderlich, so daß die Gefahr einer Verschlechterung der geschliffenen Oberflächen durch Verwerfungen ausgeschlossen ist. Da das keramische Material wesentlich härter als dasjenige Material ist, aus dem die beweglichen Pumpenteile hergestellt sind, ist der Verschleiß der Pumpeneinheit geringer als derjenige der bekannten Förderaggregate und damit erreicht die erfindungsgemäße Pumpeneinheit eine vergleichsweise hohe Lebensdauer.The use of ceramic material for the base plate and the cover and the formation of the end face of these parts facing the intermediate plate with a ground surface make it possible to achieve unevenness of less than 1tim and thus extremely small axial air gaps with a corresponding construction of the pump unit. A post-treatment of the base plate and the cover is not necessary, so that the risk of deterioration of the ground surfaces due to warpage is excluded. Since the ceramic material is much harder than the material from which the movable pump parts are made, the wear of the pump unit is less than that of the known delivery units and the pump unit according to the invention thus achieves a comparatively long service life.

Die erfindungsgemäße Materialpaarung und Ausbildung der Stirnseiten der Grundplatte und des Deckels führen darüber hinaus zu besseren Heißlaufeigenschaften der Pumpe. Dies ist im wesentlichen darauf zurückzuführen, daß, wie bereits erwähnt, die Axialspalte besonders klein realisiert werden können und somit im heißen Kraftstoff vorhandene Dampfblasen sich dort nicht festsetzen, vielmehr durch die beweglichen Pumpenteile aus dem Pumpenraum transportiert werden können.The material pairing according to the invention and the formation of the end faces of the base plate and the cover also lead to better hot running properties of the pump. This is essentially due to the fact that, as already mentioned, the axial gaps can be realized in a particularly small manner and thus vapor bubbles present in the hot fuel do not settle there, but rather can be transported out of the pump chamber by the movable pump parts.

Die gewünschte glatte Oberfläche der relevanten Stirnseiten der Grundplatte und des Deckels kann durch Schleifen, Läppen oder Honen dieser Stirnseiten erhalten werden. Wenn also im weiteren von geschliffenen Oberflächen die Rede ist, so sind im Sinne dieser Erfindung auch gehonte oder geläppte Oberflächen bzw. Oberflächen mit einer Unebenheit kleiner 1 u.m zu verstehen.The desired smooth surface of the relevant end faces of the base plate and the cover can be obtained by grinding, lapping or honing these end faces. If, in the following, we refer to ground surfaces, honed or lapped surfaces or surfaces with an unevenness of less than 1 μm are also to be understood in the sense of this invention.

Als keramisches Material wird am zweckmäßigsten Oxydkeramik, insbesondere Metalloxydkeramik Verwendung finden, wiewohl auch andere Keramiken wie z.B. Siliciumoxydkeramik und dergleichen benutzt werden können, sofern sie nur die für den vorliegenden Einsatzzweck erforderliche mechanische Festigkeit aufweisen und mit einer geschliffenen Oberfläche mit einer Unebenheit kleiner 1tim versehen werden können.Oxide ceramics, in particular metal oxide ceramics, are most suitably used as the ceramic material, although other ceramics such as e.g. Silicon oxide ceramics and the like can be used, provided that they only have the mechanical strength required for the present application and can be provided with a ground surface with an unevenness of less than 1 minute.

Da für den vorliegenden Zweck geeignetes keramisches Material wesentlich billiger ist als der bei den bekannten Pumpeneinheiten verwendete bearbeitete Sinterstahl, läßt sich die erfindungsgemäße Pumpeneinheit allein schon aus diesem Grunde mit geringerem Aufwand herstellen als die bekannten Pumpen. Dieser Aufwand kann des weiteren dadurch verringert werden, daß auch die Zwischenplatte aus keramischem Material hergestellt wird. Hierbei ist allerdings von Nachteil, daß die Radialabmessungen der Pumpeneinheit größer gewählt werden müssen als bei einer Zwischenplatte aus gesintertem Material, da sich sonst die mechanischen Eigenschaften der Pumpeneinheit verschlechtern.Since ceramic material suitable for the present purpose is considerably cheaper than the machined sintered steel used in the known pump units, the pump unit according to the invention can be manufactured with less effort than the known pumps for this reason alone. This effort can be further reduced by also producing the intermediate plate from ceramic material. However, it is disadvantageous here that the radial dimensions of the pump unit must be chosen larger than in the case of an intermediate plate made of sintered material, since otherwise the mechanical properties of the pump unit deteriorate.

Die Verwendung einer Zwischenplatte aus keramischem Material bringt andererseits den Vorteil mit sich, daß die Heißlaufeigenschaften der Pumpeneinheit weiter verbessert werden, was darauf zurückzuführen ist, daß die Keramik einen kleineren linearen Wärmeausdehnungskoeffizienten als Sinterstahl aufweist. So haben Keramiken üblicherweise einen Wärmeausdehnungskoeffizient zwischen 6 und 8 x 10-6 1/*C, während Sinterstahl einen solchen von etwa 12 x 10-6 1/ " C hat. Bei Erwärmung der Pumpeneinheit dehnt sich also der Sinterstahl stärker aus als die keramische Zwischenplatte, so daß mit zunehmender Erwärmung der Pumpeneinheit die Axialspalte zwischen den sich bewegenden Pumpenteilen und der Grundplatte bzw. dem Deckel immer kleiner werden. Dieser Effekt kann im übrigen in verstärktem Umfange durch Verwendung einer Zwischenplatte aus Hartkohle oder Kunstkohle genutzt werden, deren linearer Wärmeausdehnungskoeffizient zwischen 4 bis 6 x 10-6 1/ ` C liegt. Bei Kunstkohlen handelt es sich im wesentlichen um eine Mischung aus Kunststoff oder Kunstharz und Graphit, die zusammengesintert ist, bei Hartkohle im wesentlichen um gepreßten und gebrannten Graphit.On the other hand, the use of an intermediate plate made of ceramic material has the advantage that the hot running properties of the pump unit are further improved, which is due to the fact that the ceramic has a smaller linear coefficient of thermal expansion than sintered steel. Ceramics usually have a coefficient of thermal expansion between 6 and 8 x 10- 6 1 / * C, while sintered steel has a coefficient of around 12 x 10- 6 1 / "C. When the pump unit is heated, the sintered steel expands more than the ceramic one Intermediate plate, so that with increasing heating of the pump unit the axial gaps between the moving pump parts and the base plate or the cover become smaller and smaller 4 to 6 x 10- 6 1 / `C. Synthetic carbons are essentially a mixture of plastic or synthetic resin and graphite which is sintered together, hard carbons are essentially pressed and fired graphite.

Die Erfindung sei anhand der Zeichnung, die in zum Teil schematischer Darstellung ein Ausführungsbeispiel enthält, näher erläutert. Es Zeigen

  • Figur 1 einen Schnitt durch eine Pumpeneinheit,
  • Figur 2 eine Aufsicht auf die Pumpeneinheit gemäß Figur 1 und
  • Figur 3 eine Aufsicht auf die Zwischenplatte mit einem Gerotor der Pumpeneinheit gemäß Figur 1.
The invention will be explained in more detail with reference to the drawing, which contains an exemplary embodiment in a partially schematic representation. Show it
  • FIG. 1 shows a section through a pump unit,
  • Figure 2 is a plan view of the pump unit according to Figure 1 and
  • 3 shows a plan view of the intermediate plate with a gerotor of the pump unit according to FIG. 1.

Wie insbesondere aus Figur 1 hervorgeht, besteht die Pumpeneinheit aus einer Grundplatte 1, einer Zwischenplatte 2 und einem Deckel 3, die mittels vier Schrauben 4 und dazugehöriger Muttern 5 zusammengehalten sind.As can be seen in particular from FIG. 1, the pump unit consists of a base plate 1, an intermediate plate 2 and a cover 3, which are held together by means of four screws 4 and associated nuts 5.

Die Grundplatte 1 ist mit einer sichelförmigen Einlaßöffnung 6 für das zu fördernde Medium, d.h. für den zu fördernden Kraftstoff, versehen sowie mit einer Führungsbuchse 7, deren Innenbohrung 8 zur Aufnahme der Antriebswelle des nicht dargestellten elektrischen Antriebsmotors dient und deren nach innen ragender Fortsatz 9 zur Lagerung des Außenzahnrades 10 des Gerotors 11 ausgebildet ist.The base plate 1 is provided with a crescent-shaped inlet opening 6 for the medium to be conveyed, i.e. for the fuel to be delivered, and provided with a guide bushing 7, the inner bore 8 of which serves to receive the drive shaft of the electric drive motor (not shown) and whose inwardly projecting extension 9 is designed to support the outer gear 10 of the gerotor 11.

Der Deckel 3 ist mit einer Durchtrittsöffnung 12 für die Antriebswelle mit einer Auslaßöffnung 13 für das zu fördernde Medium versehen.The lid 3 is provided with a passage opening 12 for the drive shaft with an outlet opening 13 for the medium to be conveyed.

Der Deckel 3 und die Grundplatte 1 bestehen jeweils aus Aluminiumoxydkeramik. Die der Zwischenplatte 2 zugewandten Stirnseiten der Grundplatte 1 und des Deckels 3 sind spiegelglatt bearbeitet.The cover 3 and the base plate 1 each consist of aluminum oxide ceramic. The end faces of the base plate 1 and the cover 3 facing the intermediate plate 2 are machined to a mirror finish.

Wie insbesondere aus der Figur 3 ersichtlich ist, enthält die Zwischenplatte 2 eine kreisförmige Ausnehmung 14, die um einen Betrag a exzentrisch zur Mittenachse 15 der Pumpeneinheit angeordnet ist. In der Ausnehmung 14 ist der Gerotor 11 gelagert, der aus einem Innenzahnrad 16 und dem zentrisch gelagerten Außenzahnrad 10 besteht. Innenzahnrad 16 und Außenzahnrad 10 unterscheiden sich um einen Zahn. Beide Zahnräder 10 und 16 sind aus Sintermetall, beispielsweise Sint D 30, hergestellt.As can be seen in particular from FIG. 3, the intermediate plate 2 contains a circular recess 14 which is arranged eccentrically to the central axis 15 of the pump unit by an amount a. The gerotor 11, which consists of an internal gear 16 and the centrally mounted external gear 10, is mounted in the recess 14. Internal gear 16 and external gear 10 differ by one tooth. Both gears 10 and 16 are made of sintered metal, for example Sint D 30.

Das Außenzahnrad 10 ist auf seiner dem Dekkel 3 zugewandten Stirnseite mit axialen Zähnen 17 versehen, die in entsprechende Ausnehmungen eines auf der Antriebswelle des Antriebsmotors sitzenden Gegenstücks angeordnet sind. Die beiden ineinandergreifenden Teile bilden also eine zahnartige Kupplung.The external gear 10 is provided on its end face facing the cover 3 with axial teeth 17 which are arranged in corresponding recesses of a counterpart seated on the drive shaft of the drive motor. The two interlocking parts thus form a tooth-like coupling.

Wie bereits erwähnt, kann die Zwischenplatte 2 ebenfalls aus Sintermetall hergestellt sein. In diesem Falle ist zumindest die Innenfläche der kreisförmigen Ausnehmung dampfbehandelt, so daß sich dort ein hartes Sintermetalloxyd bildet, das den Verschleiß zwischen dem Innenzahnrad 16 und der Zwischenplatte 2 verringert.As already mentioned, the intermediate plate 2 can also be made of sintered metal. In this case, at least the inner surface of the circular recess is steam-treated, so that a hard sintered metal oxide forms there, which reduces the wear between the internal gear 16 and the intermediate plate 2.

Auf eine solche Dampfbehandlung kann verzichtet werden, wenn die Zwischenplatte 2 aus Keramik hergestellt ist oder aus Hartkohle oder Kunstkohle. In diesen Fällen sollte jedoch aus Festigkeitsgründen die Zwischenplatte 2 radial vergrößert werden; andernfalls besteht die Gefahr eines Ausbrechens der Bohrungen 18, 19 oder 20.Such a steam treatment can be dispensed with if the intermediate plate 2 is made of ceramic or of hard coal or synthetic carbon. In these cases, however, the intermediate plate 2 should be enlarged radially for reasons of strength; otherwise there is a risk of the holes 18, 19 or 20 breaking out.

Claims (6)

1. Förderaggregat, insbesondere zum Fördern von Kraftstoff mit einem elektrischen Antriebsmotor und einer mit diesem gekuppelten Pumpeneinheit, die aus einer mit einer Einlaßöffnung versehenen Grundplatte, einer daran anliegenden Zwischenplatte mit einer Ausnehmung, in der die umlaufenden, aus einem Sintermetall bestehenden Pumpenteile, insbesondere ein Gerotor, drehbar gelagert sind, und einem auf der Zwischenplatte aufliegenden Deckel mit einer Auslassöffnung und einer Durchtrittsöffnung für die Welle des Antriebsmotors, dadurch gekennzeichnet, daß zumindest die Grundplatte (1) und der Deckel (3) aus keramischem Material bestehen und daß die Grundplatte (1) und der Deckel (3) jeweils auf ihrer der Zwischenplatte (2) zugewandten Stirnseite zumindest im Bereich der umlaufenden Pumpenteile (10, 16) mit geschliffenen Oberflächen versehen sind.1. Delivery unit, in particular for delivering fuel with an electric drive motor and a pump unit coupled to it, which consists of a base plate provided with an inlet opening, an adjoining intermediate plate with a recess in which the peripheral pump parts consisting of a sintered metal, in particular a Gerotor, are rotatably mounted, and a cover resting on the intermediate plate with an outlet opening and a passage opening for the shaft of the drive motor, characterized in that at least the base plate (1) and the cover (3) consist of ceramic material and that the base plate (1) and the cover (3 ) are each provided with ground surfaces on their end face facing the intermediate plate (2) at least in the area of the peripheral pump parts (10, 16). 2. Förderaggregat nach Anspruch 1, dadurch gekennzeichnet, daß als keramisches Material Oxydkeramik vorgesehen ist.2. Conveyor unit according to claim 1, characterized in that oxide ceramic is provided as the ceramic material. 3. Förderaggregat nach Anspruch 2, dadurch gekennzeichnet, daß Metalloxydkeramik vorgesehen ist.3. Conveyor unit according to claim 2, characterized in that metal oxide ceramic is provided. 4. Förderaggregat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Zwischenplatte (2) aus keramischem Material besteht.4. Conveyor unit according to one of claims 1 to 3, characterized in that the intermediate plate (2) consists of ceramic material. 5. Förderaggregat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Zwischenplatte (2) aus Hartkohle besteht.5. Conveyor unit according to one of claims 1 to 3, characterized in that the intermediate plate (2) consists of hard coal. 6. Förderaggregat nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Zwischenplatte (2) aus Kunstkohle besteht.6. Conveyor unit according to one of claims 1 to 3, characterized in that the intermediate plate (2) consists of charcoal.
EP90124382A 1990-07-05 1990-12-17 Fuel supply pump Expired - Lifetime EP0464261B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4021500A DE4021500C3 (en) 1990-07-05 1990-07-05 Delivery unit, in particular for delivering fuel
DE4021500 1990-07-05

Publications (2)

Publication Number Publication Date
EP0464261A1 true EP0464261A1 (en) 1992-01-08
EP0464261B1 EP0464261B1 (en) 1994-02-16

Family

ID=6409753

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90124382A Expired - Lifetime EP0464261B1 (en) 1990-07-05 1990-12-17 Fuel supply pump

Country Status (3)

Country Link
US (1) US5156540A (en)
EP (1) EP0464261B1 (en)
DE (2) DE4021500C3 (en)

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Also Published As

Publication number Publication date
DE59004630D1 (en) 1994-03-24
DE4021500A1 (en) 1992-01-16
DE4021500C2 (en) 1995-05-24
DE4021500C3 (en) 1998-10-22
EP0464261B1 (en) 1994-02-16
US5156540A (en) 1992-10-20

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