EP0466976B1 - Pump unit, especially for the pumping of fuel - Google Patents

Pump unit, especially for the pumping of fuel Download PDF

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Publication number
EP0466976B1
EP0466976B1 EP90124381A EP90124381A EP0466976B1 EP 0466976 B1 EP0466976 B1 EP 0466976B1 EP 90124381 A EP90124381 A EP 90124381A EP 90124381 A EP90124381 A EP 90124381A EP 0466976 B1 EP0466976 B1 EP 0466976B1
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EP
European Patent Office
Prior art keywords
delivery
pump wheel
delivery unit
pump
unit according
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Expired - Lifetime
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EP90124381A
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German (de)
French (fr)
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EP0466976A1 (en
Inventor
Christoph Schmidt
Thomas Werner
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Mannesmann VDO AG
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Mannesmann VDO AG
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Publication of EP0466976A1 publication Critical patent/EP0466976A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/188—Rotors specially for regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/35—Reducing friction between regenerative impeller discs and casing walls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/915—Pump or portion thereof by casting or molding

Definitions

  • the invention relates to a delivery unit for delivering fuel, with an electric drive motor and with this pump unit coupled, which consists of a first housing part with a first ring sector-shaped, opening in an axial inlet opening and a second housing part with a second ring sector-shaped, in a Axial outlet opening discharge channel of the same diameter as the first and a central passage opening for the drive shaft of the drive motor and consists of a pump wheel in operative connection with the drive shaft, arranged between the two housing parts, with a plurality of tooth-like, arranged in the circumferential area, the blades with the annular Interact with demand channels.
  • Conveyor units of this type are already known, in which the two housing parts and the pump wheel of the pump unit consist of aluminum. The parts are manufactured using the metal injection molding process and then anodized or hard-coated, which makes the parts very expensive.
  • These known delivery units are used in motor vehicles for gasoline injection, where a nominal pressure of the order of 0.15 MPa (1.5 bar) is required. This nominal pressure can only be achieved considering the highest possible efficiency if the Axial gaps between the pump wheel and the housing parts are as small as possible. Axial gaps of a total of 3/100 mm are aimed for.
  • the efficiency of the pump unit also depends crucially on the shape of the ring channels and their surface roughness. The lower the latter, the higher the efficiency. Very little surface roughness can be achieved by using aluminum, so that for this reason too the use of aluminum has so far been maintained.
  • a pump corresponding to the construction of the delivery unit described at the outset is known from DD-A-266 481.
  • the pump wheel of this pump is made of metal oxide ceramic, while the housing parts are preferably made of epoxy resin.
  • the side surfaces of the pump wheel facing the housing parts are machined by lapping or polishing and have a very low roughness.
  • a side channel pump is known from DE-A-24 05 112, in which a slide ring made of graphite-impregnated plastic is arranged between the pump wheel and the parts of the pump housing adjacent to it.
  • the invention has for its object to improve the performance of pumps of the type described in the introduction and, moreover, to design them in such a way that they can be produced with as little effort as possible.
  • the two housing parts and the pump wheel of the pump unit are each formed as a cast or pressed part from a graphite-plastic mixture and that the contacting end faces of the pump wheel and the two housing parts are roughened.
  • the pump unit consists of a first, cover-like housing part 1, a second, cup-shaped housing part 2 and a pump wheel 3, which is rotatably mounted in the cavity formed by the two housing parts.
  • the rotatable mounting is carried out by a bush 4 molded onto the pump wheel 3, which is guided radially in a corresponding recess 5 in the housing part.
  • axial teeth 6 are formed, which engage in corresponding recesses of a counterpart seated on the drive shaft of the drive motor, not shown, so that the drive shaft and the pump wheel 3 are operatively connected to one another via this tooth-like coupling.
  • the drive shaft of the drive motor is further guided in a centrally arranged bushing 7 of the housing part 1.
  • the housing part 1 also has an essentially axially extending inlet opening 8 which opens into a conveyor channel 9 which extends in the form of a ring sector.
  • This delivery channel 9 forms with the annular sector-shaped delivery channel 10 in the housing part 2 a hose-like delivery chamber in which the fuel is transported from the inlet opening 8 by means of the impeller to the outlet opening 11, which is molded into the housing part 2 and opens into the delivery channel 10.
  • the pump wheel is designed in the form of a peripheral wheel. It is provided with a multiplicity of tooth-like blades 12, which are formed by axial recesses from the two end regions of the pump wheel. The blades on one end face are offset from those on the other end face by half the distance between two adjacent blades. Upon rotation of the pump wheel 3, this results in a fluid flow moving spirally forward in the delivery channels 9 and 10.
  • the housing parts 1 and 2 and the pump wheel 3 consist of synthetic carbon - according to a preferred embodiment of a mixture of 60 to 80 percent graphite and a residual portion of phenolic resin - and after their production in an injection molding or transfer molding process have a mirror-smooth surface, which, if the injection molding tools are manufactured precisely enough, can have a roughness depth of R z 1.
  • This shallow roughness which is excellent for the channels 9 and 10 and the blade walls 12, would lead to the impeller 3 seizing up on the housing parts 1 and 2 if the three parts were under axial pressure.
  • the end faces of the pump wheel 3 and the end faces thereof facing the housing parts 1 and 2 are machined in such a way that these surfaces have a roughness depth of R z 10.
  • This roughening process destroys the outermost phenolic resin layer and exposes the underlying graphite structure, which can now also serve as a lubricant and lubricant. This is a particular advantage of the pump unit according to the invention.

Description

Die Erfindung bezieht sich auf ein Förderaggregat zum Fördern von Kraftstoff, mit einem elektrischen Antriebsmotor und einer mit dieser gekuppelten Pumpeneinheit, die aus einem ersten Gehäuseteil mit einem ersten ringsektorförmigen, in einer axiale Einlaßöffnung mündenden Förderkanal und einem zweiten Gehäuseteil mit einem zweiten ringsektorförmigen, in eine axiale Auslaßöffnung mündenden Förderkanal gleichen Durchmessers wie der erste und einer zentralen Durchtrittsöffnung für die Antriebswelle des Antriebsmotors besteht sowie aus einem mit der Antriebswelle in Wirkverbindung stehenden, zwischen den beiden Gehäuseteilen angeordneten Pumpenrad mit einer Vielzahl von zahnartigen, im Umfangsbereich angeordneten Schaufeln, die mit den kreisringförmigen Forderkanälen zusammenwirken.The invention relates to a delivery unit for delivering fuel, with an electric drive motor and with this pump unit coupled, which consists of a first housing part with a first ring sector-shaped, opening in an axial inlet opening and a second housing part with a second ring sector-shaped, in a Axial outlet opening discharge channel of the same diameter as the first and a central passage opening for the drive shaft of the drive motor and consists of a pump wheel in operative connection with the drive shaft, arranged between the two housing parts, with a plurality of tooth-like, arranged in the circumferential area, the blades with the annular Interact with demand channels.

Es sind bereits Förderaggregate dieser Gattung bekannt, bei denen die beiden Gehäuseteile und das Pumpenrad der Pumpeneinheit aus Aluminium bestehen. Die Teile werden im Metall-Spritzguß-Verfahren hergestellt und anschließend eloxiert oder hartcoatiert, was die Teile sehr stark verteuert. Diese bekannten Förderaggregate werden im Kraftfahrzeug zur Benzineinspritzung verwendet, wo ein Nenndruck in der Größenordnung von 0,15 MPa (1,5 bar) benötigt wird. Dieser Nenndruck läßt sich unter Berücksichtigung eines möglichst hohen Wirkungsgrades nur dann erzielen, wenn die Axialspalte zwischen der Pumpenrad und den Gehäuseteilen möglichst klein sind. Angestrebt sind Axlalspalte von insgesamt 3/100 mm. Aus diesem Grunde lassen sich derartige Pumpeheingeiten auch nicht aus thermosplastischen oder duroplastischen Kunststoffen herstellen, da diese Kunststoffe in Verbindung mit Kraftstoff zum Aufquellen neigen und mithin bereits nach wenigen Stunden das aufgequollene Pumpenrad zwischen den Gehäuseteilen blockieren würden. Zur Herstellung dieser Teile hat sich daher Aluminium durchgesetzt, das im Spritzgußverfahren verarbeitet werden kann. Nachteilig und stark verteuernd sind jedoch, wie bereits erwähnt, die bei diesem Material unumgänglichen Nachbearbeitungsmaßnahmen.Conveyor units of this type are already known, in which the two housing parts and the pump wheel of the pump unit consist of aluminum. The parts are manufactured using the metal injection molding process and then anodized or hard-coated, which makes the parts very expensive. These known delivery units are used in motor vehicles for gasoline injection, where a nominal pressure of the order of 0.15 MPa (1.5 bar) is required. This nominal pressure can only be achieved considering the highest possible efficiency if the Axial gaps between the pump wheel and the housing parts are as small as possible. Axial gaps of a total of 3/100 mm are aimed for. For this reason it is not possible to manufacture such pump units from thermoplastic or thermosetting plastics, since these plastics tend to swell in connection with fuel and would block the swollen pump wheel between the housing parts after only a few hours. Aluminum has therefore become established for the production of these parts and can be processed by injection molding. However, as already mentioned, the post-processing measures that are inevitable for this material are disadvantageous and very expensive.

Der Wirkungsgrad der Pumpeneinheit hängt des weiteren entscheidend vom Verlauf der Ringkanäle und deren Oberflächenrauhigkeit ab. Je geringer letztere sind, desto höher der Wirkungsgrad. Durch Verwendung von Aluminium lassen sich sehr geringe Oberflächenrauhigkeiten erreichen, so daß auch aus diesem Grunde an der Verwendung von Aluminium bisher festgehalten wurde.The efficiency of the pump unit also depends crucially on the shape of the ring channels and their surface roughness. The lower the latter, the higher the efficiency. Very little surface roughness can be achieved by using aluminum, so that for this reason too the use of aluminum has so far been maintained.

Eine dem Aufbau des eingangs beschriebenen Förderaggregats entsprechende Pumpe ist aus der DD-A-266 481 bekannt. Das Pumpenrad dieser Pumpe besteht aus Metalloxidkeramik, während die Gehäuseteile vorzugsweise aus Epoxidharz bestehen. Die den Gehäuseteilen zugewandten Seitenflächen des Pumpenrades sind durch Läppen oder Polieren bearbeitet und weisen eine nur sehr geringe Rauhtiefe auf.A pump corresponding to the construction of the delivery unit described at the outset is known from DD-A-266 481. The pump wheel of this pump is made of metal oxide ceramic, while the housing parts are preferably made of epoxy resin. The side surfaces of the pump wheel facing the housing parts are machined by lapping or polishing and have a very low roughness.

Aus der DE-A-24 05 112 ist eine Seitenkanalpumpe bekannt, bei der zwischen dem Pumpenrad und den diesem benachbarten Teilen des Pumpengehäuses ein Gleitring aus graphitimprägnierten Kunststoff angeordnet ist.A side channel pump is known from DE-A-24 05 112, in which a slide ring made of graphite-impregnated plastic is arranged between the pump wheel and the parts of the pump housing adjacent to it.

Der Erfindung liegt die Aufgabe zugrunde, Pumpen der eingangs beschriebenen Gattung hinsichtlich ihrer Leistungsfähigkeit zu verbessern und sie darüber hinaus so zu gestalten, daß sie mit einem möglichst geringen Aufwand herstellbar sind.The invention has for its object to improve the performance of pumps of the type described in the introduction and, moreover, to design them in such a way that they can be produced with as little effort as possible.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die beiden Gehäuseteile und das Pumpenrad der Pumpeneinheit jeweils als Guß- oder Preßteil aus einer Graphit-Kunststoff-Mischung ausgebildet sind und daß die einander berührenden Stirnflächen des Pumpenrades und der beiden Gehäuseteile aufgerauht sind.This object is achieved in that the two housing parts and the pump wheel of the pump unit are each formed as a cast or pressed part from a graphite-plastic mixture and that the contacting end faces of the pump wheel and the two housing parts are roughened.

Es hat sich gezeigt, daß Teile aus einer Graphit-Kunststoff-Mischung im Kraftstoff keinen meßbaren Quellen unterworfen sind, so daß sie sich, nachdem auch ihre Festigkeit in brauchbaren Grenzen liegt, zur Herstellung von Komponenten eignen, die mit Vergaserkraftstoffen in Berührung kommen. Als besonders vorteilhaft haben sich Mischungen aus 60 bis 80 Prozent Graphit und einem Restanteil von Phenolharz erwiesen.It has been shown that parts made from a graphite-plastic mixture in the fuel are not subject to any measurable sources, so that, after their strength is within useful limits, they are suitable for the production of components which come into contact with gasoline fuels. Mixtures of 60 to 80 percent graphite and a residual portion of phenolic resin have proven to be particularly advantageous.

Beim Herstellen von Komponenten aus Graphit-Kunststoff-Mischungen im Guß- oder Preßverfahren ergeben sich sehr glatte Oberflächen, deren Rauhtiefe bei entsprechender Herstellung der Formwerkzeuge vorzugsweise bei Rz 1 liegt. Es lassen sich somit Förderkanäle herstellen, deren Oberfläche spiegelglatt oder, anders ausgedrückt, eine äußerst geringe Rauhtiefe haben. Die Oberflächen der so hergestellten Teile sind andererseits jedoch so glatt, daß ein Festfressen des Pumpenrades an den Gehäuseteilen spätestens beim Fördern heißen Kraftstoffs auftritt. Um dies zu verhindern, werden die einander berührenden Stirnflächen des Pumpenrades und der beiden Gehäuseteile aufgerauht und zwar in vorteilhafterweise bis zu einer Rauhtiefe zwischen Rz 3 und Rz 20.When producing components from graphite-plastic mixtures in a casting or pressing process, very smooth surfaces are obtained, the roughness of which, when the molds are produced accordingly, is preferably R z 1. It is thus possible to produce conveying ducts whose surface is as smooth as glass or, in other words, has an extremely low roughness. On the other hand, the surfaces of the parts produced in this way are so smooth that the impeller seizes on the housing parts at the latest when hot fuel is being delivered. To prevent this, the contacting end faces of the pump wheel and the two housing parts are roughened and advantageously up to a roughness between R z 3 and R z 20.

Durch diese sich gegenseitig stützenden und fortbildenden Maßnahmen und Merkmale wird somit eine Pumpeneinheit geschaffen, die nicht nur mit äußerst geringem Aufwand sondern auch mit sehr engen Toleranzen herstellbar ist, so daß auch der erwünschte hohe Wirkungsgrad erzielt werden kann. Es hat sich gezeigt, daß eine Optimierung des Wirkungsgrades dann erreicht wird, wenn die Rauhtiefe für die angerauhten Stirnflächen des Pumpenrades und der Gehäuseteile in der Größenordnung von Rz 10 liegt.These mutually supportive and advanced measures and features thus create a pump unit which can be produced not only with extremely little effort but also with very tight tolerances, so that the desired high efficiency can also be achieved. It has been shown that an optimization of the efficiency is achieved when the roughness for the roughened end faces of the pump wheel and the housing parts is of the order of R z 10.

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

Figur 1
einen Querschnitt durch eine Pumpeneinheit des Förderaggregats,
Figur 2
eine Aufsicht auf die Pumpeneinheit nach Figur 1 und
Figur 3
eine auseinandergezogene Schnittdarstellung der Pumpeneinheit nach 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
Figure 1
a cross section through a pump unit of the delivery unit,
Figure 2
a top view of the pump unit of Figure 1 and
Figure 3
an exploded sectional view of the pump unit of Figure 1.

Die Pumpeneinheit besteht aus einem ersten, deckelartigen Gehäuseteil 1, einem zweiten, napfförmig ausgebildeten Gehäuseteil 2 und einem Pumpenrad 3, das in dem durch die beiden Gehäuseteile gebildeten Hohlraum drehbar gelagert ist. Die drehbare Lagerung erfolgt durch eine an das Pumpenrad 3 angeformte Buchse 4, die in einer entsprechenden Ausnehmung 5 im Gehäuseteil radial geführt ist. Auf dem Innenumfang der Buchse 4 sind axiale Zähne 6 angeformt, die in entsprechende Ausnehmungen eines auf der nicht dargestellten Antriebswelle des Antriebsmotors sitzenden Gegenstücks eingreifen, so daß die Antriebswelle und das Pumpenrad 3 über diese zahnartige Kupplung miteinander in Wirkverbindung stehen. Die Antriebswelle des Antriebsmotors ist des weiteren in einer zentral angeordneten Laufbuchse 7 des Gehäuseteils 1 geführt.The pump unit consists of a first, cover-like housing part 1, a second, cup-shaped housing part 2 and a pump wheel 3, which is rotatably mounted in the cavity formed by the two housing parts. The rotatable mounting is carried out by a bush 4 molded onto the pump wheel 3, which is guided radially in a corresponding recess 5 in the housing part. On the inner circumference of the socket 4, axial teeth 6 are formed, which engage in corresponding recesses of a counterpart seated on the drive shaft of the drive motor, not shown, so that the drive shaft and the pump wheel 3 are operatively connected to one another via this tooth-like coupling. The drive shaft of the drive motor is further guided in a centrally arranged bushing 7 of the housing part 1.

Das Gehäuseteil 1 weist des weiteren eine im wesentlichen axial verlaufende Einlaßöffnung 8 auf, die in einen ringsektorförmig verlaufenden Förderkanal 9 mündet. Dieser Förderkanal 9 bildet mit dem ringsektorförmig verlaufenden Förderkanal 10 im Gehäuseteil 2 einen schlauchartigen Förderraum, in dem der Kraftstoff von der Einlaßöffnung 8 mittels des Laufrades zur Auslaßöffnung 11 transportiert wird, die in das Gehäuseteil 2 eingeformt ist und in den Förderkanal 10 mündet.The housing part 1 also has an essentially axially extending inlet opening 8 which opens into a conveyor channel 9 which extends in the form of a ring sector. This delivery channel 9 forms with the annular sector-shaped delivery channel 10 in the housing part 2 a hose-like delivery chamber in which the fuel is transported from the inlet opening 8 by means of the impeller to the outlet opening 11, which is molded into the housing part 2 and opens into the delivery channel 10.

Wie insbesondere aus den Figuren 1 und 2 ersichtlich ist, ist das Pumpenrad in Form eines Peripheralrades ausgebildet. Es ist mit einer Vielzahl von zahnartigen Schaufeln 12 versehen, die durch axiale Ausnehmungen aus den beiden Stirnbereichen des Pumpenrades gebildet sind. Die Schaufeln auf der einen Stirnfläche sind gegenüber denjenigen auf der anderen Stirnfläche um den halben Abstand zweier benachbarter Schaufeln versetzt angeordnet. Bei Drehung des Pumpenrades 3 ergibt sich damit eine spiralförmig sich vorwärtsbewegende Fluidströmung in den Förderkanälen 9 und 10.As can be seen in particular from FIGS. 1 and 2, the pump wheel is designed in the form of a peripheral wheel. It is provided with a multiplicity of tooth-like blades 12, which are formed by axial recesses from the two end regions of the pump wheel. The blades on one end face are offset from those on the other end face by half the distance between two adjacent blades. Upon rotation of the pump wheel 3, this results in a fluid flow moving spirally forward in the delivery channels 9 and 10.

Je geringer nun die Rauhtiefe der Wandflächen der Förderkanäle 9 und 10 und der Schaufeln 12 ist, desto weniger Reibung tritt zwischen diesen Wänden und der Flüssigkeitsspirale auf. Folglich geht in die Pumpleistung die Rauhtiefe dieser Wände direkt ein. Entsprechendes gilt für die Luftspalte zwischen dem Gehäuseteil 1 und dem Pumpenrad 3 einerseits und dem Pumpenrad 3 und dem Gehäuseteil 2 andererseits. Je geringer diese Luftspalten sind, desto besser der Wirkungsgrad.The smaller the roughness of the wall surfaces of the delivery channels 9 and 10 and the blades 12, the less friction occurs between these walls and the liquid spiral. As a result, the roughness of these walls is directly involved in the pump power. The same applies to the air gaps between the housing part 1 and the pump wheel 3 on the one hand and the pump wheel 3 and the housing part 2 on the other hand. The smaller these air gaps are, the better the efficiency.

Die Gehäuseteile 1 und 2 und das Pumpenrad 3 bestehen aus Kunstkohle - gemäß einer bevorzugten Ausführungsform aus einer Mischung aus 60 bis 80 Prozent Graphit und einem Restanteil Phenolharz - und weisen nach ihrer Herstellung in einem Spritzguß- oder Spritzpreßverfahren eine spiegelglatte Oberfläche auf, die, sofern die Spritzgußwerkzeuge exakt genug hergestellt sind, eine Rauhtiefe von Rz 1 haben können. Diese geringe Rauhtiefe, die sich in hervorragender Weise für die Kanäle 9 und 10 und die Schaufelwände 12 eignet, würde dazu führen, daß das Pumpenrad 3 sich an den Gehäuseteilen 1 und 2 festfressen würde, wenn die drei Teile unter einem Axialdruck stehen. Um dies zu verhindern, werden die Stirnflächen des Pumpenrades 3 sowie die diesem zugewandten Stirnflächen der Gehäuseteile 1 und 2 spanabhebend bearbeitet, dergestalt, daß diese Flächen eine Rauhtiefe von Rz 10 aufweisen. Durch diesen Aufrauhungsvorgang wird die äußerste Phenolharzschicht zerstört und die darunterliegende Graphitstruktur freigelegt, die nunmehr gleichzeitig als Gleit- und Schmiermittel dienen kann. Dies ist ein besonderer Vorteil der erfindungsgemäßen Pumpeneinheit.The housing parts 1 and 2 and the pump wheel 3 consist of synthetic carbon - according to a preferred embodiment of a mixture of 60 to 80 percent graphite and a residual portion of phenolic resin - and after their production in an injection molding or transfer molding process have a mirror-smooth surface, which, if the injection molding tools are manufactured precisely enough, can have a roughness depth of R z 1. This shallow roughness, which is excellent for the channels 9 and 10 and the blade walls 12, would lead to the impeller 3 seizing up on the housing parts 1 and 2 if the three parts were under axial pressure. To prevent this, the end faces of the pump wheel 3 and the end faces thereof facing the housing parts 1 and 2 are machined in such a way that these surfaces have a roughness depth of R z 10. This roughening process destroys the outermost phenolic resin layer and exposes the underlying graphite structure, which can now also serve as a lubricant and lubricant. This is a particular advantage of the pump unit according to the invention.

Claims (6)

  1. A delivery unit for the delivery of fuel, having an electric drive motor and a pump unit coupled to the latter, which consists of a first housing part (1) with a first delivery channel (9) in the form of a ring sector running into an axial inlet opening (8) and a second housing part (2) with a second delivery channel (10) in the form of a ring sector running into an axial outlet opening (11) and of the same diameter as the first, and a central passageway opening for the drive shaft of the drive motor, which delivery unit also comprises a pump wheel (3) actively connected to the drive shaft and disposed between the two housing parts (1, 2), with a plurality of tooth-like blades (12) disposed in the region of the periphery of the pump wheel which cooperate with the delivery channels of circular ring form, characterised in that the two housing parts (1, 2) and the pump wheel (3) are each constructed as cast or pressed components from a graphite-plastics mixture and that the faces of the pump wheel (3) and of the two housing parts (1, 2) which contact each other are roughened.
  2. A delivery unit according to claim 1, characterised in that the surface roughness of the roughened faces is between Rz 3 and Rz 20.
  3. A delivery unit according to claim 2, characterised in that the surface roughness is of the order of Rz 10.
  4. A delivery unit according to any one of claims 1 to 3, characterised in that the surface roughness of the non-roughened faces is of the order of Rz 1.
  5. A delivery unit according to any one of claims 1 to 4, characterised in that a mixture of 60-80 % graphite and a residual proportion of phenolic resin is provided as the graphite-plastics mixture.
  6. A delivery unit according to any one of claims 1 to 5, characterised in that the pump wheel is constructed in the form of a peripheral wheel.
EP90124381A 1990-07-14 1990-12-17 Pump unit, especially for the pumping of fuel Expired - Lifetime EP0466976B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4022467A DE4022467C3 (en) 1990-07-14 1990-07-14 Delivery unit, in particular for the delivery of fuel
DE4022467 1990-07-14

Publications (2)

Publication Number Publication Date
EP0466976A1 EP0466976A1 (en) 1992-01-22
EP0466976B1 true EP0466976B1 (en) 1994-03-16

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EP90124381A Expired - Lifetime EP0466976B1 (en) 1990-07-14 1990-12-17 Pump unit, especially for the pumping of fuel

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US (1) US5141396A (en)
EP (1) EP0466976B1 (en)
DE (2) DE4022467C3 (en)

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Also Published As

Publication number Publication date
DE4022467C3 (en) 1995-08-31
EP0466976A1 (en) 1992-01-22
DE59005030D1 (en) 1994-04-21
US5141396A (en) 1992-08-25
DE4022467A1 (en) 1992-01-16
DE4022467C2 (en) 1992-07-30

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