EP0464261B1 - Fuel supply pump - Google Patents
Fuel supply pump Download PDFInfo
- Publication number
- EP0464261B1 EP0464261B1 EP90124382A EP90124382A EP0464261B1 EP 0464261 B1 EP0464261 B1 EP 0464261B1 EP 90124382 A EP90124382 A EP 90124382A EP 90124382 A EP90124382 A EP 90124382A EP 0464261 B1 EP0464261 B1 EP 0464261B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- geared wheel
- fuel delivery
- delivery pump
- cover
- distance plate
- 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
Links
- 239000000446 fuel Substances 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims description 8
- 229910010293 ceramic material Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000011224 oxide ceramic Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 229910021385 hard carbon Inorganic materials 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000003245 coal Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Images
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 fuel delivery pump, with an intermediate plate sandwiched between a base plate and a cover, which has an axially continuous circular recess, with a ring-like internal gear rotatably mounted in the recess and an eccentric to the internal gear and recess within the internal gear , rotatably drivable external gear, which has a smaller number of teeth than the internal gear and engages with some of its teeth in tooth gaps of the internal gear, with an inlet opening and an outlet opening, which are arranged in the base plate or in the cover.
- 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.
- a rotary vane pump is known from DE-U-87 00 135, the base plate, cover and optionally other components can be made of ceramic.
- a rotary vane pump is also known, the rotor, side walls and possibly the slider of the pump can be made of plastic-bonded coal.
- DE-A-14 26 771 shows a helical gear pump, the inner pump parts of which can be provided with a ceramic coating.
- the base plate and cover consist of a ceramic material and are machined on their mutually facing end faces such that they have a surface roughness of less than 1 micron
- the internal gear and the external gear consist of a sintered metal and about the same width as that Have intermediate plate and that the intermediate plate consists of a material with a slightly lower coefficient of thermal expansion such as the material of the internal gear and the external gear.
- 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.
- the most suitable ceramic material is oxide ceramics, in particular metal oxide ceramics, although other ceramics such.
- oxide ceramics in particular metal oxide ceramics, although other ceramics such.
- B. 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 less than 1 micron.
- the fuel delivery pump according to the invention can be manufactured with less effort than the known pumps for this reason alone.
- an intermediate plate made of hard coal or synthetic carbon has the advantage that the hot running properties of the pump unit are further improved, which is due to the fact that the coal has a smaller linear coefficient of thermal expansion than sintered steel.
- Coal usually has a coefficient of thermal expansion between 4 to 6 x 10 ⁇ 6 1 / ° C, while sintered steel has a coefficient of about 12 x 10 ⁇ 6 1 / ° C.
- the sintered steel expands more than the intermediate plate made of carbon, 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.
- Artificial carbons are essentially a mixture of plastic or synthetic resin and graphite that 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 with a crescent-shaped inlet opening 6 for the medium to be conveyed, i.e. H. 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 external 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 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.
Landscapes
- 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 Erfindung bezieht sich auf eine Kraftstoff-Förderpumpe, mit einer sandwichartig zwischen einer Grundplatte und einem Deckel angeordneten Zwischenplatte, die eine axial durchgehende kreisförmige Ausnehmung aufweist, mit einem in der Ausnehmung drehbar gelagerten ringartigen Innenzahnrad und einem innerhalb des Innenzahnrads exzentrisch zu Innenzahnrad und Ausnehmung angeordneten, drehbar antreibbaren Außenzahnrad, das eine geringere Zähnezahl als das Innenzahnrad aufweist und mit einem Teil seiner Zähne in Zahnlücken des Innenzahnrads eingreift, mit einer Einlaßöffnung und einer Auslaßöffnung, die in der Grundplatte bzw. im Deckel angeordnet sind.The invention relates to a fuel delivery pump, with an intermediate plate sandwiched between a base plate and a cover, which has an axially continuous circular recess, with a ring-like internal gear rotatably mounted in the recess and an eccentric to the internal gear and recess within the internal gear , rotatably drivable external gear, which has a smaller number of teeth than the internal gear and engages with some of its teeth in tooth gaps of the internal gear, with an inlet opening and an outlet opening, which are arranged in the base plate or in the cover.
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 stationary 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 5 µm erreichen. Aufgrund der erforderlichen Dampfbehandlung entstehen jedoch in dem so bearbeiteten Material Verwerfungen, die in der Größenordnung von 8-10 µm liegen. Da die durch die Dampfbehandlung entstehende Oxydschicht nur ca. 5-6 µm 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 Sinderstahl 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 with a material combination of sinder steel and sintered steel oxide.
Aus der DE-B-12 31 563 ist eine Pumpe der eingangs genannten Art bekannt.From DE-B-12 31 563 a pump of the type mentioned is known.
Weiterhin ist aus der DE-U-87 00 135 eine Drehflügelpumpe bekannt, deren Grundplatte, Deckel und gegebenenfalls weitere Bauteile aus Keramik hergestellt sein können.Furthermore, a rotary vane pump is known from DE-U-87 00 135, the base plate, cover and optionally other components can be made of ceramic.
Aus der DE-U-89 08 757 ist ebenfalls eine Drehflügelpumpe bekannt, deren Rotor, Seitenwände und gegebenenfalls die Schieber der Pumpe aus kunststoffgebundener Kohle hergestellt sein können.From DE-U-89 08 757 a rotary vane pump is also known, the rotor, side walls and possibly the slider of the pump can be made of plastic-bonded coal.
Die DE-A-14 26 771 zeigt eine Schraubenradpumpe, deren innere Pumpenteile mit einem Keramiküberzug versehen sein können.DE-A-14 26 771 shows a helical gear pump, the inner pump parts of which can be provided with a ceramic coating.
Diese Schwierigkeiten und Nachteile sollen durch die Erfindung beseitigt werden. Es ist daher Aufgabe der Erfindung, eine Kraftstoff-Förderpumpe der eingangs genannten Art zu schaffen, die auch unter thermischer Belastung einen möglichst hohen Wirkungsgrad hat, der sich auch während der Lebensdauer der Kraftstoff-Förderpumpe weitgehend nicht 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 fuel delivery pump of the type mentioned at the outset, which has the highest possible efficiency even under thermal load and which largely does not deteriorate even during the service life of the fuel delivery pump. In addition, increasing the efficiency should go hand in hand with as little effort as possible.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß Grundplatte und Deckel aus einem keramischen Material bestehen und an ihren einander zugewandten Stirnseiten derart bearbeitet sind, daß sie eine Oberflächenrauigkeit von kleiner 1 µm besitzen, daß Innenzahnrad und Außenzahnrad aus einem Sintermetall bestehen und etwa gleiche Breite wie die Zwischenplatte aufweisen und daß die Zwischenplatte aus einem Werkstoff mit etwas geringerem Wärmeausdehnungskoeffizienten wie dem Werkstoff von Innenzahnrad und Außenzahnrad besteht.This object is achieved in that the base plate and cover consist of a ceramic material and are machined on their mutually facing end faces such that they have a surface roughness of less than 1 micron, that the internal gear and the external gear consist of a sintered metal and about the same width as that Have intermediate plate and that the intermediate plate consists of a material with a slightly lower coefficient of thermal expansion such as the material of the internal gear and the external gear.
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 die Unebenheiten von weniger als 1 µm erreichen und damit äußerst geringe axiale Luftspalte bei entsprechendem Aufbau der Kraftstoff-Förderpumpe. 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 Kraftstoff-Förderpumpe geringer als derjenige der bekannten Förderaggregate und damit erreicht die erfindungsgemäße Kraftstoff-Förderpumpe 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 the unevenness of less than 1 μm and thus extremely small axial air gaps with a corresponding construction of the fuel delivery pump. After-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 significantly harder than the material from which the movable pump parts are made, the wear of the fuel delivery pump is less than that of the known delivery units and the fuel delivery pump 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 pairing of materials according to the invention and the design 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 µm 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 1 µm versehen werden können.The most suitable ceramic material is oxide ceramics, in particular metal oxide ceramics, although other ceramics such. B. 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 less than 1 micron.
Da für den vorliegenen Zweck geeignetes keramisches Material wesentlich billiger ist als der bei bekannten Kraftstoff-Förderpumpen verwendete bearbeitete Sinterstahl, läßt sich die erfindungsgemäße Kraftstoff-Förderpumpe allein schon aus diesem Grunde mit geringerem Aufwand herstellen als die bekannten Pumpen.Since ceramic material suitable for the present purpose is much cheaper than the machined sintered steel used in known fuel delivery pumps, the fuel delivery pump according to the invention can be manufactured with less effort than the known pumps for this reason alone.
Die Verwendung einer Zwischenplatte aus Hartkohle oder Kunstkohle bringt den Vorteil mit sich, daß die Heißlaufeigenschaften der Pumpeneinheit weiter verbessert werden, was darauf zurückzuführen ist, daß die Kohle einen kleineren linearen Wärmeausdehnungskoeffizienten als Sinterstahl aufweist. So hat Kohle üblicherweise einen Wärmeausdeh- nungskoeffizient zwischen 4 bis 6 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 Zwischenplatte aus Kohle, so daß mit zunehmender Erwärmung der Pumpeneinheit die Axialspalte zwischen den sich bewegenden Pumpenteilen und der Grundplatte bzw. dem Deckel immer kleiner werden. 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.The use of an intermediate plate made of hard coal or synthetic carbon has the advantage that the hot running properties of the pump unit are further improved, which is due to the fact that the coal has a smaller linear coefficient of thermal expansion than sintered steel. Coal usually has a coefficient of thermal expansion between 4 to 6 x 10⁻⁶ 1 / ° C, while sintered steel has a coefficient of about 12 x 10⁻⁶ 1 / ° C. When the pump unit is heated, the sintered steel expands more than the intermediate plate made of carbon, 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. Artificial carbons are essentially a mixture of plastic or synthetic resin and graphite that 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:
- Fig. 1
- einen Schnitt durch eine Pumpeneinheit,
- Fig. 2
- eine Aufsicht auf die Pumpeneinheit gemäß Fig. 1 und
- Fig. 3
- eine Aufsicht auf die Zwischenplatte mit einem Gerotor der Pumpeneinheit gemäß Fig. 1.
- Fig. 1
- a section through a pump unit,
- Fig. 2
- a plan of the pump unit according to FIG. 1 and
- Fig. 3
- a plan view of the intermediate plate with a gerotor of the pump unit according to FIG. 1.
Wie insbesondere aus Fig. 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
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 Lagerng des Außenzahnrades 10 des Gerotors 11 ausgebildet ist.The base plate 1 is with a crescent-shaped inlet opening 6 for the medium to be conveyed, i.e. H. for the fuel to be delivered and provided with a guide bushing 7, the
Der Deckel 3 ist mit einer Durchtrittsöffnung 12 für die Antriebswelle mit einer Auslaßöffnung 13 für das zu fördernde Medium versehen.The
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
Wie insbesondere aus der Fig. 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
Das Außenzahnrad 10 ist auf seiner dem Deckel 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
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
Auf eine solche Dampfbehandlung kann verzichtet werden, wenn die Zwischenplatte 2 aus Hartkohle oder Kunstkohle hergestellt ist. 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
Claims (5)
- A fuel delivery pump, with a distance plate (2) disposed in the manner of a sandwich between a baseplate (1) and a cover (3), which distance plate has a circular axial recess (14) passing through it, with a ring-like internal geared wheel (16) rotatably mounted in the recess (14) and an external geared wheel (10) which can be rotatably driven disposed inside the internal geared wheel (16) and eccentrically in relation to the internal geared wheel (16) and the recess (14), which external geared wheel has a lesser number of teeth than the internal geared wheel (16) and which engages by means of a portion of its teeth in tooth gaps of the internal geared wheel (16), with an inlet opening (6) and an outlet opening (13) which are disposed in the baseplate (1) or in the cover (3), characterised in that the baseplate (1) and the cover (3) consist of a ceramic material and their mutually facing end faces are machined so that they have a surface roughness of less than 1 µm, that the internal geared wheel (16) and the external geared wheel (10) consist of a sintered metal and are of approximately the same width as the distance plate (2) and that the distance plate (2) consists of a material with a somewhat lower coefficient of thermal expansion than the material of the internal geared wheel (16) and the external geared wheel (10).
- A fuel delivery pump according to claim 1, characterised in that an oxide ceramic is provided as the ceramic material.
- A fuel delivery pump according to claim 2, characterised in that a metal oxide ceramic is provided.
- A fuel delivery pump according to any one of claims 1 to 3, characterised in that the distance plate (2) consists of hard carbon.
- A fuel delivery pump according to any one of claims 1 to 3, characterised in that the distance plate (2) consists of synthetic carbon.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4021500 | 1990-07-05 | ||
| DE4021500A DE4021500C3 (en) | 1990-07-05 | 1990-07-05 | Delivery unit, in particular for delivering fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0464261A1 EP0464261A1 (en) | 1992-01-08 |
| EP0464261B1 true 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) |
Families Citing this family (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4303328C2 (en) * | 1993-02-05 | 2001-11-29 | Mannesmann Vdo Ag | Gerotor pump for conveying fluid, in particular as a fuel delivery unit for motor vehicles |
| US5472329A (en) * | 1993-07-15 | 1995-12-05 | Alliedsignal Inc. | Gerotor pump with ceramic ring |
| DE4401783A1 (en) * | 1994-01-21 | 1995-07-27 | Cerasiv Gmbh | Conveying unit with a ceramic internal gear pump |
| DK138195A (en) * | 1995-12-05 | 1997-06-06 | Danfoss As | Pump or motor |
| DE19710804A1 (en) * | 1997-03-17 | 1998-09-24 | Geraete Und Pumpenbau Gmbh | Gear pump for conveying fluids |
| US5997262A (en) * | 1997-04-10 | 1999-12-07 | Walbro Corporation | Screw pins for a gear rotor fuel pump assembly |
| DE19718792A1 (en) * | 1997-05-03 | 1998-11-05 | Mannesmann Vdo Ag | Conveyor unit |
| DE19726794A1 (en) * | 1997-06-24 | 1999-01-07 | Elektra Beckum Ag | Water high pressure cleaning device |
| DE19833514B4 (en) * | 1997-07-30 | 2005-04-28 | Buhler Motor Gmbh | Drive for folding down a motor vehicle rearview mirror |
| DE19826367C2 (en) * | 1998-06-12 | 2000-05-18 | Geraete & Pumpenbau Gmbh | Internal gear pump |
| DE19858483A1 (en) | 1998-12-18 | 2000-08-31 | Mannesmann Rexroth Ag | Hydraulic displacement machine, in particular displacement pump |
| DE10024884A1 (en) * | 2000-05-19 | 2001-11-22 | Bosch Gmbh Robert | Gear pump |
| DE10141863A1 (en) * | 2000-08-28 | 2002-03-14 | Dana Corp | Hydraulic displacement pump has inner and outer rotor with different number of teeth and different heat expansion coefficients |
| EP1354135B1 (en) * | 2001-01-22 | 2006-12-20 | HNP Mikrosysteme GmbH | Miniature precision bearings for minisystems or microsystems and method for assembling such systems |
| DE10155875A1 (en) * | 2001-11-14 | 2003-05-22 | Zahnradfabrik Friedrichshafen | Oscillating pump has sealing device in connection between dividing element and housing or disc which divides up ring chamber into chambers of variable volume |
| ITBO20020167A1 (en) | 2002-03-29 | 2003-09-29 | Corob Spa | REFINEMENTS IN A ROTARY VOLUMETRIC PUMP FOR FLUID PRODUCTS |
| DE10224784A1 (en) * | 2002-06-04 | 2003-12-18 | Siemens Ag | G-rotor pump |
| US6769889B1 (en) * | 2003-04-02 | 2004-08-03 | Delphi Technologies, Inc. | Balanced pressure gerotor fuel pump |
| DE10327321A1 (en) * | 2003-06-16 | 2005-01-13 | Siemens Ag | As a G-rotor pump trained positive displacement pump |
| DE10331979A1 (en) * | 2003-07-14 | 2005-02-17 | Gkn Sinter Metals Gmbh | Pump with optimized axial clearance |
| DE10341841A1 (en) * | 2003-09-09 | 2005-04-07 | Siemens Ag | According to the gerotor principle working fuel pump |
| DE10356807A1 (en) * | 2003-12-05 | 2004-12-23 | Audi Ag | Positive displacement gear pump for use in e.g. internal combustion (IC) engine, has pump case formed of material e.g. steel, whose coefficient of thermal expansion is lower than that of material e.g. zinc, for pair of gears |
| JP2006152928A (en) * | 2004-11-30 | 2006-06-15 | Hitachi Ltd | Internal gear pump |
| DE102006047312A1 (en) * | 2006-10-06 | 2008-04-10 | Sauer-Danfoss Aps | Hydraulic machine |
| CN104373345B (en) * | 2014-10-15 | 2017-08-08 | 哈尔滨东安发动机（集团）有限公司 | A kind of oil pump for optimizing axial gap |
| DE102015002352A1 (en) | 2014-12-17 | 2016-06-23 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Electric oil pump, in particular for a motor vehicle |
| JP6507998B2 (en) * | 2015-11-03 | 2019-05-08 | 株式会社デンソー | Fuel pump |
| JP6447482B2 (en) * | 2015-12-15 | 2019-01-09 | 株式会社デンソー | Fuel pump |
| US10247295B1 (en) * | 2018-10-22 | 2019-04-02 | GM Global Technology Operations LLC | Transfer case oil pump assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE759960C (en) * | 1940-03-09 | 1953-09-14 | Rudolf Roetheli | Gear pump |
| GB548064A (en) * | 1940-03-09 | 1942-09-23 | Rudolf Roetheli | Improvements in or relating to gear pumps |
| DE1231563B (en) * | 1963-01-16 | 1966-12-29 | Danfoss As | Adjustable gear pump |
| US3152551A (en) * | 1963-01-25 | 1964-10-13 | Viking Pump Company | Pump |
| US3170409A (en) * | 1963-04-01 | 1965-02-23 | Dura Corp | Rotor pump seal |
| FR2163935A5 (en) * | 1971-12-07 | 1973-07-27 | Rhone Poulenc Sa | |
| DE2312263A1 (en) * | 1973-03-12 | 1974-09-19 | Volkswagenwerk Ag | PISTON FOR ROTATING PISTON INTERNAL ENGINE |
| DE2422783A1 (en) * | 1974-05-10 | 1975-11-27 | Siemens Ag | DEVICE FOR PUMPING LIQUID MEDIA, IN PARTICULAR FOR PUMPING FUEL IN MOTOR VEHICLES |
| JPS51148084A (en) * | 1975-06-10 | 1976-12-18 | Kuraray Co Ltd | Process for assimilating and decomposing of formaldehyde by the use of microorganisms |
| DE2652184A1 (en) * | 1976-11-16 | 1978-05-18 | Kloeckner Humboldt Deutz Ag | Gear pump or motor with sintered wheels - has split shafts held in gear wheels over short length |
| DD144943A1 (en) * | 1979-07-11 | 1980-11-12 | Tilo Scholze | PUMP OF SILICATED MATERIAL |
| DE2938276A1 (en) * | 1979-09-21 | 1981-04-09 | Robert Bosch Gmbh, 7000 Stuttgart | WING CELL COMPRESSORS |
| JPS58220989A (en) * | 1982-06-14 | 1983-12-22 | Diesel Kiki Co Ltd | Compressor of variable displacement vane type |
| US4618318A (en) * | 1982-12-06 | 1986-10-21 | Hansen Engine Corporation | Vane and seal assembly |
| EP0180788A1 (en) * | 1984-10-08 | 1986-05-14 | Shimadzu Corporation | Gear pump or motor |
| DE3437021A1 (en) * | 1984-10-09 | 1986-04-10 | Robert Bosch Gmbh, 7000 Stuttgart | AGGREGATE FOR PROCESSING FUEL FROM A STORAGE TANK FOR THE INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE |
| GB2182393A (en) * | 1985-11-04 | 1987-05-13 | Ngk Insulators Ltd | Intermeshing screw pump |
| DE3620705A1 (en) * | 1986-06-20 | 1987-12-23 | Schwaebische Huettenwerke Gmbh | Internal gear wheel pump as lubricating oil pump |
| DE8700135U1 (en) * | 1987-01-03 | 1988-05-05 | Greiner, Peter | Working machine, especially vacuum pump or compressor |
| DE8908757U1 (en) * | 1989-03-25 | 1989-09-21 | Gebr. Becker GmbH & Co, 5600 Wuppertal | Rotary vane vacuum pump |
-
1990
- 1990-07-05 DE DE4021500A patent/DE4021500C3/en not_active Expired - Fee Related
- 1990-12-17 DE DE90124382T patent/DE59004630D1/en not_active Expired - Fee Related
- 1990-12-17 EP EP90124382A patent/EP0464261B1/en not_active Expired - Lifetime
-
1991
- 1991-05-10 US US07/698,678 patent/US5156540A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4021500C3 (en) | 1998-10-22 |
| US5156540A (en) | 1992-10-20 |
| EP0464261A1 (en) | 1992-01-08 |
| DE4021500C2 (en) | 1995-05-24 |
| DE4021500A1 (en) | 1992-01-16 |
| DE59004630D1 (en) | 1994-03-24 |
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