EP2359004A2 - Fuel pump for internal combustion engines - Google Patents

Fuel pump for internal combustion engines

Info

Publication number
EP2359004A2
EP2359004A2 EP09765055A EP09765055A EP2359004A2 EP 2359004 A2 EP2359004 A2 EP 2359004A2 EP 09765055 A EP09765055 A EP 09765055A EP 09765055 A EP09765055 A EP 09765055A EP 2359004 A2 EP2359004 A2 EP 2359004A2
Authority
EP
European Patent Office
Prior art keywords
pump
fuel
drive shaft
fuel pump
polygon
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.)
Withdrawn
Application number
EP09765055A
Other languages
German (de)
French (fr)
Inventor
Carsten Rudolph
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.)
Thielert Aircraft Engines Vertr D D Insolvenzverwalter Dr Bruno M Kuebler GmbH
Original Assignee
Thielert Aircraft Engines Vertr D D Insolvenzverwalter Dr Bruno M Kuebler GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thielert Aircraft Engines Vertr D D Insolvenzverwalter Dr Bruno M Kuebler GmbH filed Critical Thielert Aircraft Engines Vertr D D Insolvenzverwalter Dr Bruno M Kuebler GmbH
Publication of EP2359004A2 publication Critical patent/EP2359004A2/en
Withdrawn legal-status Critical Current

Links

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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0076—Fixing rotors on shafts, e.g. by clamping together hub and shaft
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/101—Quick-acting couplings in which the parts are connected by simply bringing them together axially without axial retaining means rotating with the coupling
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • 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
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/102—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via polygon shaped connections

Definitions

  • the invention relates to a fuel pump, in particular prefeed pump for internal combustion engines, which comprises a gear pump with an impeller driven via a drive shaft, in particular for aircraft engines powered by aircraft fuel.
  • the fuel supply to the combustion chamber of aircraft engines operated in monorail technology with aircraft fuel is known to take place from a tank via a prefeed pump and a high-pressure pump to a common distributor pipe (rail) connected to the individual cylinders. Since a failure of a fuel pump inevitably leads to engine downtime, an extremely high reliability is required especially in aircraft engines.
  • the reliability and the maximum service life of the fuel pumps are limited in particular by the fact that they are lubricated with the delivered fuel and the bearings and sliding surfaces are more or less heavily loaded in accordance with the lubricity of the fuel.
  • the service life of the fuel pumps is thus significantly influenced by the lubricating properties of the respective fuel. Since the diesel engines used on aircraft are operated with a kerosene-based aviation fuel with significantly lower lubricity compared with diesel fuel, the service life of the fuel pumps is particularly low in this case.
  • a prefeed pump designed as a gear pump
  • its driven impeller drive gearwheel
  • a spline toothing to a drive shaft whose external toothing present at one shaft end (External profile) positively engages in an existing on the drive gear of the prefeed pump internal toothing (inner profile).
  • the prefeed pump designed in this way especially when used for a diesel engine powered by aircraft fuel, has only a short service life, since the drive shaft and the driven impeller, and consequently also the pump housing, are subject to high wear and thus the prefeed pump is completely complete after a short operating time must be replaced.
  • DE 100 14 548 A1 describes a gear pump for diesel fuel in which the positive connection between the drive shaft and a pump gear is produced by a flattened circle geometry or by a profiling provided with recesses and projections.
  • the invention is therefore the object of the pre-feed pump upstream of the high-pressure pump in such a way that even with the use of fuels with reduced lubricity a long life is guaranteed.
  • the essence of the invention is that the positive connection between the drive shaft and the driven pump wheel is produced by a convex polygon contour formed on the drive shaft and on the impeller
  • the drive shaft has a coupling disk in the form of a triangular shaped polygon with outwardly curved in a certain radius side surfaces and outwardly rounded corner regions, while formed in the driven pump impeller in shape and size with the coupling disk recess, so that the coupling disc engages accurately in the recess.
  • connection between the drive shaft and the pump wheel produced via two interlocking interlocking polygons ensures reliable power transmission and results in a significant reduction in wear on the positive connection point and thus the drive shaft, the pump wheels and the pump housing and thus the Life of the fuel provided for the promotion of fuel with low lubricity fuel pump increases and their essential for flight operation indispensable reliability is improved.
  • the positively interlocking convexly curved polygon contours can also be embodied as a polygon, for example as a tetragon.
  • Figure 1 is a perspective view of a feed pump designed as a gear pump in disassembled state.
  • FIG. 2 is a front view of the drive shaft formed with a coupling disc formed as a polygon;
  • FIG. and Fig. 3 is a front view of the drive gear of
  • Pre-feed pump with a trained as a polygon inner profile.
  • the prefeed pump shown in FIG. 1 in the disassembled state is designed as a gear pump and comprises a pump housing 1, in which a driven first impeller 2 and a second impeller 3 are mounted.
  • a driven drive shaft 4 is mounted in the pump housing 1.
  • An integrally formed on the drive shaft 4 coupling plate 5 has the shape of a convex, regular, here triangular polygon, that is, a triangle with three curved side edges of equal length and equal internal angles.
  • the coupling disk 5 engages in a recess 6 formed in the driven pump wheel 2, the contour of which, shaped as a polygon, coincides with the contour of the coupling disk 5.
  • the pump housing 1 is closed with the interposition of a sealing ring 8 by a housing cover 9, which is fastened by means of cylinder screws 7.
  • the polygonal outer contour of the coupling disc 5 and provided in the driven impeller 2 recess 6 is shown in more detail in Figures 2 and 3.
  • the regular triangular polygon of the coupling disc 5 and the recess 6 has a circumference with the diameter du and an inscribed circle with the diameter di.
  • the polygon has no straight side edges (side surfaces), but is convex, that is, with convex, outwardly curved in radius R s side surfaces and rounded in radius R E corner regions of the polygon of the coupling disc 5 and the recess. 6
  • the maximum width of the polygon of the recess 6 and the coupling disc 5 is designated in the drawing by W.
  • the wear of the first and also the second pump impeller and the drive shaft and the housing can be significantly reduced and the service life of the prefeed pump designed as a gear pump even when using a fuel be increased by three times with low lubricity.
  • the positive connection can also be formed by regular convex polygons with more than three corners such as a tetragon or pentagon and be applied to other fuel pumps with rotating pump wheels.

Abstract

The invention relates to a fuel pump, especially the prefeed pump for feeding aircraft fuel to the high pressure pump, wherein the form-fit connection between the drive shaft (4) and the driven impeller (2) is produced by a regular, convex, triangular polygonal contour having rounded-off lateral faces and corner faces, the drive shaft and the impeller being provided with said polygonal contour. In this manner, the wear resulting from the poor lubricating power of the kerosene-based aircraft fuel can be reduced and the service life of the fuel pump can be increased.

Description

Kraftstoffpumpe für Verbrennungsmotoren Fuel pump for internal combustion engines
Beschreibungdescription
Die Erfindung betrifft eine Kraftstoffpumpe, insbesondere Vorförderpumpe für Verbrennungsmotoren, die eine Zahnradpumpe mit einem über eine Antriebswelle angetriebenen Pumpenrad umfasst, insbesondere für mit Flugzeugkraftstoff betriebene Dieselmotoren.The invention relates to a fuel pump, in particular prefeed pump for internal combustion engines, which comprises a gear pump with an impeller driven via a drive shaft, in particular for aircraft engines powered by aircraft fuel.
Die KraftstoffZuführung zum Verbrennungsraum von in Com- mon-Rail-Technik mit Flugzeugkraftstoff betriebenen Flugzeugmotoren erfolgt bekanntermaßen aus einem Tank über eine Vorförderpumpe und eine Hochdruckpumpe zu einem an die einzelnen Zylinder angeschlossenen gemeinsamen Verteilerrohr (Rail). Da ein Ausfall einer Kraftstoffpumpe unweigerlich zum Motorstillstand führt, ist insbesondere bei Flugzeugmotoren eine extrem hohe Zuverlässigkeit gefordert. Die Zuverlässigkeit und die maximale Betriebs- dauer der Kraftstoffpumpen sind insbesondere dadurch begrenzt, dass deren Schmierung mit dem geförderten Kraftstoff erfolgt und die Lager und Gleitflächen entsprechend der Schmierfähigkeit des Kraftstoffs mehr oder weniger stark belastet sind. Die Lebensdauer der Kraftstoffpumpen wird somit maßgeblich durch die Schmiereigenschaften des jeweiligen Kraftstoffs beeinflusst. Da die bei Flugzeugen eingesetzten Dieselmotoren mit einem auf Kerosin basierenden Flugzeugkraftstoff mit gegenüber dem Dieselkraftstoff deutlich geringerer Schmierfähigkeit betrieben wer- den, ist die Lebensdauer der Kraftstoffpumpen in diesem Fall besonders gering.The fuel supply to the combustion chamber of aircraft engines operated in monorail technology with aircraft fuel is known to take place from a tank via a prefeed pump and a high-pressure pump to a common distributor pipe (rail) connected to the individual cylinders. Since a failure of a fuel pump inevitably leads to engine downtime, an extremely high reliability is required especially in aircraft engines. The reliability and the maximum service life of the fuel pumps are limited in particular by the fact that they are lubricated with the delivered fuel and the bearings and sliding surfaces are more or less heavily loaded in accordance with the lubricity of the fuel. The service life of the fuel pumps is thus significantly influenced by the lubricating properties of the respective fuel. Since the diesel engines used on aircraft are operated with a kerosene-based aviation fuel with significantly lower lubricity compared with diesel fuel, the service life of the fuel pumps is particularly low in this case.
Bei einer als Zahnradpumpe ausgebildeten Vorförderpumpe ist deren angetriebenes Pumpenrad (Antriebszahnrad) über eine Keilwellenverzahnung mit einer Antriebswelle verbunden, deren an einem Wellenende vorhandene Außenverzahnung (Außenprofil) formschlüssig in eine am Antriebszahnrad der Vorförderpumpe vorhandene Innenverzahnung (Innenprofil) eingreift. Die so ausgebildete Vorförderpumpe weist insbesondere bei der Verwendung für einen mit Flugzeug- kraftstoff betriebenen Dieselmotor eine nur geringe Lebensdauer auf, da die Antriebwelle und das angetriebene Pumpenrad und in der Folge auch das Pumpengehäuse einem hohen Verschleiß unterliegen und somit die Vorförderpumpe schon nach kurzer Betriebszeit komplett ausgetauscht wer- den muss.In a prefeed pump designed as a gear pump, its driven impeller (drive gearwheel) is connected via a spline toothing to a drive shaft whose external toothing present at one shaft end (External profile) positively engages in an existing on the drive gear of the prefeed pump internal toothing (inner profile). The prefeed pump designed in this way, especially when used for a diesel engine powered by aircraft fuel, has only a short service life, since the drive shaft and the driven impeller, and consequently also the pump housing, are subject to high wear and thus the prefeed pump is completely complete after a short operating time must be replaced.
Die De 100 14 548 Al beschreibt eine Zahnradförderpumpe für Dieselkraftstoff, bei der die formschlüssige Verbindung zwischen der Antriebswelle und dem einem Pumpenzahn- rad durch eine abgeflachte Kreisgeometrie oder über eine mit Ausnehmungen und Vorsprüngen versehene Profilierung hergestellt wird.DE 100 14 548 A1 describes a gear pump for diesel fuel in which the positive connection between the drive shaft and a pump gear is produced by a flattened circle geometry or by a profiling provided with recesses and projections.
Der Erfindung liegt daher die Aufgabe zugrunde, die der Hochdruckpumpe vorgeschaltete Vorförderpumpe so auszubilden, dass auch bei Verwendung von Kraftstoffen mit verminderter Schmierfähigkeit eine lange Lebensdauer gewährleistet ist.The invention is therefore the object of the pre-feed pump upstream of the high-pressure pump in such a way that even with the use of fuels with reduced lubricity a long life is guaranteed.
Erfindungsgemäß wird die Aufgabe mit einer gemäß denAccording to the invention, the object with a according to the
Merkmalen des Patentanspruchs 1 als Zahnradpumpe ausgebildeten Kraftstoffpumpe bzw. Vorförderpumpe gelöst. Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Characteristics of claim 1 solved as a gear pump fuel pump or prefeed pump solved. Advantageous embodiments of the invention are the subject of the dependent claims.
Der Kern der Erfindung besteht mit anderen Worten darin, dass die formschlüssige Verbindung zwischen der Antriebswelle und dem angetriebenen Pumpenrad durch eine an der Antriebswelle und am Pumpenrad ausgebildete konvexe PoIy- gonkontur hergestellt wird In weiterer Ausbildung der Erfindung weist die Antriebswelle eine Kopplungsscheibe in Form eines als Triangel geformten Polygons mit nach außen in einem bestimmten Radius gewölbten Seitenflächen sowie nach außen gerundeten Eckbereichen auf, während im angetriebenen Pumpenrad eine in Form und Größe mit der Kopplungsscheibe übereinstimmende Ausnehmung ausgebildet ist, so dass die Kopplungsscheibe passgenau in die Ausnehmung eingreift.In other words, the essence of the invention is that the positive connection between the drive shaft and the driven pump wheel is produced by a convex polygon contour formed on the drive shaft and on the impeller In a further embodiment of the invention, the drive shaft has a coupling disk in the form of a triangular shaped polygon with outwardly curved in a certain radius side surfaces and outwardly rounded corner regions, while formed in the driven pump impeller in shape and size with the coupling disk recess, so that the coupling disc engages accurately in the recess.
Überraschenderweise wurde festgestellt, dass die über zwei formschlüssig ineinander greifende Polygone hergestellte Verbindung zwischen Antriebwelle und Pumpenrad eine sichere Kraftübertragung gewährleistet und eine deutliche Verringerung des Verschleißes an der form- schlüssigen Verbindungsstelle und damit der Antriebswelle, der Pumpenräder und des Pumpengehäuses zur Folge hat und somit die Lebensdauer der zur Förderung von Kraftstoff mit geringer Schmierfähigkeit vorgesehenen Kraftstoffpumpe erhöht und deren gerade für den Flugbetrieb unabdingbare Zuverlässigkeit verbessert wird.Surprisingly, it was found that the connection between the drive shaft and the pump wheel produced via two interlocking interlocking polygons ensures reliable power transmission and results in a significant reduction in wear on the positive connection point and thus the drive shaft, the pump wheels and the pump housing and thus the Life of the fuel provided for the promotion of fuel with low lubricity fuel pump increases and their essential for flight operation indispensable reliability is improved.
In weiterer Ausgestaltung der Erfindungen können die formschlüssig ineinander greifenden konvex gewölbten Polygonkonturen auch als Vieleck, beispielsweise als Tetra- gon, ausgeführt sein.In a further embodiment of the inventions, the positively interlocking convexly curved polygon contours can also be embodied as a polygon, for example as a tetragon.
Ein Ausführungsbeispiel der Erfindung wird anhand der Zeichnung näher erläutert. Es zeigen:An embodiment of the invention will be explained in more detail with reference to the drawing. Show it:
Fig. 1 eine perspektivische Darstellung einer als Zahnradpumpe ausgebildeten Vorförderpumpe in demontiertem Zustand;Figure 1 is a perspective view of a feed pump designed as a gear pump in disassembled state.
Fig. 2 eine Vorderansicht der mit einer als Polygon ausgebildeten Kopplungsscheibe ausgebildeten Antriebswelle; und Fig. 3 eine Vorderansicht des Antriebszahnrades derFIG. 2 is a front view of the drive shaft formed with a coupling disc formed as a polygon; FIG. and Fig. 3 is a front view of the drive gear of
Vorförderpumpe mit einem als Polygon ausgebildeten Innenprofil.Pre-feed pump with a trained as a polygon inner profile.
Die in Fig. 1 in demontiertem Zustand dargestellte Vor- förderpumpe ist als Zahnradpumpe ausgebildet und umfasst ein Pumpengehäuse 1, in dem ein angetriebenes erstes Pumpenrad 2 und ein zweites Pumpenrad 3 gelagert sind. In dem Pumpengehäuse 1 ist darüber hinaus eine angetriebene Antriebswelle 4 gelagert. Eine an die Antriebswelle 4 angeformte Kopplungsscheibe 5 hat die Form eines konvexen, regelmäßigen, hier dreieckigen Polygons, das heißt, eines Triangels mit drei gewölbten Seitenkanten gleicher Länge und gleich großen Innenwinkeln. Die Kopplungsscheibe 5 greift in eine in dem angetriebenen Pumpenrad 2 ausgebildete Ausnehmung 6 ein, deren als Polygon geformte Kontur mit der Kontur der Kopplungsscheibe 5 übereinstimmt. Das Pumpengehäuse 1 ist unter Zwischenschaltung eines Dich- tungsringes 8 durch einen Gehäusedeckel 9 verschlossen, der mittels Zylinderschrauben 7 befestigt ist.The prefeed pump shown in FIG. 1 in the disassembled state is designed as a gear pump and comprises a pump housing 1, in which a driven first impeller 2 and a second impeller 3 are mounted. In addition, a driven drive shaft 4 is mounted in the pump housing 1. An integrally formed on the drive shaft 4 coupling plate 5 has the shape of a convex, regular, here triangular polygon, that is, a triangle with three curved side edges of equal length and equal internal angles. The coupling disk 5 engages in a recess 6 formed in the driven pump wheel 2, the contour of which, shaped as a polygon, coincides with the contour of the coupling disk 5. The pump housing 1 is closed with the interposition of a sealing ring 8 by a housing cover 9, which is fastened by means of cylinder screws 7.
Die polygonförmige Außenkontur der Kopplungsscheibe 5 und der im angetriebenen Pumpenrad 2 vorgesehenen Ausnehmung 6 ist in den Figuren 2 und 3 genauer dargestellt. Das regelmäßige dreieckige Polygon der Kopplungsscheibe 5 und der Ausnehmung 6 hat einen Umkreis mit dem Durchmesser du und einen Inkreis mit dem Durchmesser di . Das Polygon hat jedoch keine geraden Seitenkanten (Seitenflächen), son- dern ist konvex geformt, das heißt, mit balligen, nach außen im Radius Rs gewölbten Seitenflächen sowie mit im Radius RE gerundeten Eckbereichen des Polygons der Kopplungsscheibe 5 und der Ausnehmung 6. Die maximale Weite des Polygons der Ausnehmung 6 bzw. der Kopplungsscheibe 5 ist in der Zeichnung mit W bezeichnet. Mit dem als konvexe Polygonverbindung ausgeführten Form- schluss zwischen der Antriebswelle 6 und dem angetriebenen Pumpenrad 2 kann der Verschleiß des ersten und auch des zweiten Pumpenrades sowie der Antriebwelle und des Gehäuses deutlich gesenkt werden und die Lebensdauer der als Zahnradpumpe ausgeführten Vorförderpumpe selbst bei Verwendung eines Kraftstoffs mit geringer Schmierfähigkeit um das Dreifache erhöht werden.The polygonal outer contour of the coupling disc 5 and provided in the driven impeller 2 recess 6 is shown in more detail in Figures 2 and 3. The regular triangular polygon of the coupling disc 5 and the recess 6 has a circumference with the diameter du and an inscribed circle with the diameter di. However, the polygon has no straight side edges (side surfaces), but is convex, that is, with convex, outwardly curved in radius R s side surfaces and rounded in radius R E corner regions of the polygon of the coupling disc 5 and the recess. 6 The maximum width of the polygon of the recess 6 and the coupling disc 5 is designated in the drawing by W. With the form-fitting between the drive shaft 6 and the driven impeller 2, which is in the form of a convex polygonal connection, the wear of the first and also the second pump impeller and the drive shaft and the housing can be significantly reduced and the service life of the prefeed pump designed as a gear pump even when using a fuel be increased by three times with low lubricity.
Die Erfindung ist nicht auf das zuvor beschriebene Ausführungsbeispiel beschränkt. Beispielweise kann die formschlüssige Verbindung auch durch regelmäßige konvexe Polygone mit mehr als drei Ecken wie ein Tetragon oder Pentagon gebildet sein und auch bei anderen Kraftstoffpumpen mit rotierenden Pumpenrädern angewendet werden. The invention is not limited to the embodiment described above. For example, the positive connection can also be formed by regular convex polygons with more than three corners such as a tetragon or pentagon and be applied to other fuel pumps with rotating pump wheels.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Pumpengehäuse 2 Erstes, angetriebenes Pumpenrad1 pump housing 2 First, driven impeller
3 Zweites Pumpenrad3 Second impeller
4 Antriebswelle4 drive shaft
5 Kopplungsscheibe, dreieckiges konvexes Poly¬ gon 6 Ausnehmung, dreieckiges konvexes Polygon5 Coupling disc, triangular convex poly ¬ 6 gon recess triangular convex polygon
7 Zylinderschrauben7 cylinder screws
8 Dichtungsring8 sealing ring
9 Gehäusedeckel du Umkreis des Polygons di Inkreis des Polygons9 Cover of the circumference of the polygon of the polygon
W max . Weite des PolygonsW max. Width of the polygon
R3 Radius der Seitenfächen des PolygonsR 3 radius of the lateral surfaces of the polygon
RE Radius der Eckflächen des Polygons R E Radius of the corner faces of the polygon

Claims

Patentansprüche claims
1. Kraftstoffpumpe, insbesondere Vorförderpumpe für Verbrennungsmotoren, die eine Zahnradpumpe mit einem über eine Antriebswelle angetriebenen Pumpenrad um- fasst, insbesondere für mit Flugzeugkraftstoff betriebene Dieselmotoren, gekennzeichnet durch eine als regelmäßiges konvexes, nach außen gewölbte Sei- tenflächen und Eckbereiche aufweisendes Polygon ausgeführte formschlüssige Verbindung zwischen dem angetriebenen Pumpenrad (2) und der Antriebswelle (4).1. Fuel pump, in particular prefeed pump for internal combustion engines, which comprises a gear pump with an impeller driven via a drive shaft, in particular for aircraft fuel diesel engines, characterized by a regular convex, outwardly curved side surfaces and corner regions having polygon executed positive connection between the driven impeller (2) and the drive shaft (4).
2. Kraftstoffpumpe nach Anspruch 1, dadurch gekenn- zeichnet, dass die formschlüssige Polygonverbindung eine an der Antriebswelle (4) vorgesehene Kopplungsscheibe (5) und eine im angetriebenen Pumpenrad (2) eingeformte Ausnehmung (6 ) mit übereinstimmender Polygonkontur aufweisen.2. Fuel pump according to claim 1, characterized in that the positive polygonal connection on the drive shaft (4) provided coupling disc (5) and in the driven impeller (2) molded recess (6) having matching polygon contour.
3. Kraftstoffpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die konvexe Polygonkontur drei- eckförmig ist und im Radius R3 nach außen gewölbte Seitenflächen sowie im Radius RE nach außen gewölbte Eckbereiche aufweist.3. Fuel pump according to claim 1 or 2, characterized in that the convex polygonal contour is triangular-shaped and has in the radius R 3 outwardly curved side surfaces and in the radius R E outwardly curved corner regions.
4. Kraftstoffpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die regelmäßige konvexe Polygonkontur als Tetragon oder Pentagon ausgebildet ist. 4. Fuel pump according to claim 1 or 2, characterized in that the regular convex polygon contour is formed as a tetragon or pentagon.
EP09765055A 2008-11-21 2009-11-13 Fuel pump for internal combustion engines Withdrawn EP2359004A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008043991A DE102008043991A1 (en) 2008-11-21 2008-11-21 Fuel pump for internal combustion engines
PCT/EP2009/065180 WO2010057838A2 (en) 2008-11-21 2009-11-13 Fuel pump for internal combustion engines

Publications (1)

Publication Number Publication Date
EP2359004A2 true EP2359004A2 (en) 2011-08-24

Family

ID=42114315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09765055A Withdrawn EP2359004A2 (en) 2008-11-21 2009-11-13 Fuel pump for internal combustion engines

Country Status (6)

Country Link
US (1) US20110223049A1 (en)
EP (1) EP2359004A2 (en)
CN (1) CN102239333A (en)
CA (1) CA2747074A1 (en)
DE (1) DE102008043991A1 (en)
WO (1) WO2010057838A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104074741B (en) * 2013-03-26 2017-09-29 德昌电机(深圳)有限公司 Fluid pump
FR3013406A1 (en) * 2013-11-15 2015-05-22 Peugeot Citroen Automobiles Sa MECHANICAL COUPLING ARRANGEMENT FOR A DRIVE PIECE WITH A DRIVE PIECE, A PETROL PUMP FOR A MOTOR VEHICLE AND A MOTOR VEHICLE, COMPRISING SUCH AN ARRANGEMENT
BE1030550B1 (en) * 2022-05-23 2023-12-18 Safran Aero Boosters COUPLING BY POLYGONAL PROFILES OF PUMPS IN A LUBRICATION GROUP

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669411A (en) * 1926-08-28 1928-05-15 Duston And Clark Engineering C Rolling mill
AT185926B (en) * 1953-05-16 1956-06-25 Saurer Ag Adolph Cast rotor for rotary lobe compressors
US2880676A (en) * 1956-03-26 1959-04-07 Succop Anna Louise Motor and pump combination
US3196800A (en) * 1962-12-13 1965-07-27 Parker Hannifin Corp Gear pump
GB1174066A (en) * 1966-12-31 1969-12-10 Otto Eckerle Improvements in and relating to Driving Gears for Internal Gear Pumps
US3372646A (en) * 1967-03-20 1968-03-12 Borg Warner Contaminant resistant fluid supply system
US4340317A (en) * 1981-05-07 1982-07-20 Northern Research & Engineering Corp. Splineless coupling means
EP0098777A3 (en) * 1982-07-01 1984-07-11 The Bendix Corporation Coupling arrangement for driving and driven members
DE3413773C1 (en) * 1984-04-12 1985-06-27 Danfoss A/S, Nordborg Hydraulic vane machine
DE3538950A1 (en) * 1984-11-23 1986-06-05 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Viscose pump, especially gear pump
CN87200648U (en) * 1987-01-14 1987-11-25 田澍藩 Internal mesh and outward rotary string rotor pump
DE3940314A1 (en) * 1988-12-08 1990-06-13 Zahnradfabrik Friedrichshafen Drive with gear hub and shaft joint - has solid shaft with bored ends to limit overload torque
JP3667034B2 (en) * 1996-07-17 2005-07-06 光洋精工株式会社 Electric pump
DE19648996A1 (en) * 1996-11-27 1998-06-10 Ford Global Tech Inc Polygon connection of a hub with a shaft
DE19726794A1 (en) * 1997-06-24 1999-01-07 Elektra Beckum Ag Water high pressure cleaning device
DE59710695D1 (en) * 1997-09-19 2003-10-09 Abb Turbo Systems Ag Baden Compressor wheel attachment for high-speed turbo machines
DE29916106U1 (en) * 1999-09-15 2001-01-25 Asf Thomas Ind Gmbh Pump with pump housing
DE10014548A1 (en) * 2000-03-23 2001-09-27 Bosch Gmbh Robert Gear pump for feeding liquid has connection between coupling cavity and compression cavity
US6461111B1 (en) * 2000-08-25 2002-10-08 Ingersoll-Rand Company Tapered polygon coupling
DE10394335B4 (en) * 2003-09-11 2014-07-31 Siemens Aktiengesellschaft Three-phase synchronous machine with permanent magnet rotor with induction cage
JP2005146994A (en) * 2003-11-17 2005-06-09 Hitachi Ltd Oil pump
DE102005021597A1 (en) * 2005-05-10 2006-11-16 Siemens Ag Fuel pump
JP4545072B2 (en) * 2005-09-09 2010-09-15 本田技研工業株式会社 Pump rotor device
JP5076484B2 (en) * 2006-12-19 2012-11-21 株式会社ジェイテクト Electric pump unit and electric oil pump
KR101503088B1 (en) * 2007-03-20 2015-03-16 엘리콘 텍스타일 게엠베하 운트 코. 카게 Gear Wheel Pump

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010057838A2 *

Also Published As

Publication number Publication date
US20110223049A1 (en) 2011-09-15
WO2010057838A3 (en) 2010-09-10
CN102239333A (en) 2011-11-09
WO2010057838A2 (en) 2010-05-27
CA2747074A1 (en) 2010-05-27
DE102008043991A1 (en) 2010-05-27

Similar Documents

Publication Publication Date Title
DE102012106810A1 (en) Impeller for a fluid energy machine
EP1305523B1 (en) Internal gear pump
DE102009028378A1 (en) high pressure pump
EP2956658B1 (en) Roller tappet
EP2359004A2 (en) Fuel pump for internal combustion engines
DE102010030852A1 (en) High pressure pump for common rail injection system utilized in vehicle for direct injection of fuel i.e. petrol, has pump piston whose axial hole comprises radial bore for connection with low pressure chamber and displacement chamber
WO2002081902A1 (en) High pressure fuel pump for a fuel system on a direct injection internal combustion engine, fuel system and internal combustion engine
WO2008055745A1 (en) Camshaft drive with geometric cam roller stabilization
EP2964954A1 (en) High-pressure pump for a fuel injection system
DE102009029293A1 (en) Gear pump with a drive shaft, a drive gear and a driven gear
DE102014220384B4 (en) High pressure fuel pump and drive shaft
DE102013203141A1 (en) High pressure pump for fuel injection system, particularly common-rail injection system, has housing part with suction valve, where suction valve comprises valve plate that is pressed in bore of housing part of high pressure pump
DE102009047568A1 (en) Fuel high-pressure pump, has guiding recess provided for roller that cooperates with cam of drive shaft, asymmetrical in cross section with two halves, where one half includes circular arc shape and other half includes elliptical arc shape
DE102011076018A1 (en) piston pump
WO2009124788A1 (en) High-pressure pump arrangement having a single-plunger high-pressure pump
WO2010097247A1 (en) Radial piston pump comprising a cam shaft having partially hardened cam edges
WO2011098314A1 (en) High-pressure fuel pump
DE102008054753A1 (en) Internal gear pump
DE102012217484A1 (en) Internal gear pump, in particular for a hydraulic vehicle brake system
EP2823177B1 (en) Piston pump
WO2010057889A1 (en) Common rail high pressure pump
DE102009047709A1 (en) Geared pump i.e. fuel pump, of fuel system in common rail injection system of internal-combustion engine in motor vehicle, has drive element for transferring rotating movement of shaft to gear wheel and exhibiting polygonal profile
DE10037468A1 (en) Control disc especially for a vane pump
DE102015218754A1 (en) high pressure pump
WO2018060158A1 (en) Tappet assembly for a radial piston pump, and radial piston pump

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110616

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140603