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EP3051133A1 - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
EP3051133A1
EP3051133A1 EP16150404.8A EP16150404A EP3051133A1 EP 3051133 A1 EP3051133 A1 EP 3051133A1 EP 16150404 A EP16150404 A EP 16150404A EP 3051133 A1 EP3051133 A1 EP 3051133A1
Authority
EP
European Patent Office
Prior art keywords
drive spindle
fuel pump
coupling element
coupling
pump according
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.)
Ceased
Application number
EP16150404.8A
Other languages
German (de)
French (fr)
Inventor
Jürgen Metz
Kris Zemanek
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.)
Leistritz Pumpen GmbH
Original Assignee
Leistritz Pumpen 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 Leistritz Pumpen GmbH filed Critical Leistritz Pumpen GmbH
Publication of EP3051133A1 publication Critical patent/EP3051133A1/en
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • 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
    • 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
    • F04C2/16—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 helical teeth, e.g. chevron-shaped, screw type
    • 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
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/12—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary
    • 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
    • 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
    • F04C15/008—Prime movers
    • 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
    • F04C2210/00—Fluid
    • F04C2210/20—Fluid liquid, i.e. incompressible
    • F04C2210/203—Fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a fuel pump, with a housing in which an electric drive motor is accommodated, the motor shaft is coupled via a coupling element with a drive spindle of a screw pump.
  • the electric drive motor is connected directly to a drive spindle which drives a spindle, whereby a fluid is axially conveyed.
  • the drive spindle and the spindle form migratory delivery chambers for a fluid, in particular fuel, whereby the fuel is conveyed from a suction-side inlet to a pressure-side outlet.
  • the electric drive motor can be traversed by the fuel, whereby the drive motor is cooled.
  • the dog clutch connects the shaft of the driving motor to the drive spindle, which compensates for axis errors and angular errors between the drive shaft and the screw shaft.
  • At one axial end of the drive spindle two intersecting grooves are ground, resulting in two opposing jaws having a triangular cross-section.
  • the coupling provided there is disc-shaped and has two recesses into which engage the triangular claws.
  • the coupling has a central slot in which the end portion of the drive shaft, which is referred to there as the stub axle, engages.
  • the invention is therefore based on the object to provide a fuel pump that is less expensive to produce.
  • the drive spindle has a substantially flat axial surface at its coupling-side end.
  • the invention is based on the realization that the manufacturing costs of a fuel pump can be reduced if a drive spindle with a flat axial surface is used. This eliminates the relatively complex grinding operations by which the two triangular claws are generated. Previously, several consecutive grinding operations were required to make one side of the triangular jaw. According to the invention, the generation of the claws is dispensed with, so that only a cutting to length of the manufactured drive spindle is required. For this purpose, first a blank is produced from which several, for example two or three, separate drive spindles can be produced by dividing. In this way, the production of the individual drive spindles can be done efficiently and inexpensively. Another advantage is the fact that the length of a drive spindle is about 5% shorter by the dropped claws compared to a conventional, claw-bearing drive spindle. Accordingly, this results in a considerable saving of material.
  • the axial surface of the drive spindle extends over its entire cross section. This means that the drive spindle has at its coupling end only a single flat surface that can be easily produced by a machining process. The flat axial surface is obtained when dividing the blank of the drive spindle into several equal parts.
  • a particularly reliable function of the fuel pump according to the invention can hardly be ensured if one side of the coupling element is formed opposite to the coupling end of the drive spindle.
  • This side of the coupling element is accordingly formed as a negative shape of the drive spindle and thus has a recess into which the coupling side End of the drive spindle engages in the assembled state.
  • the coupling element and the coupling-side end of the drive spindle are positively and / or non-positively connected to each other.
  • the coupling element is designed so that it is able to transmit the torque output by the motor shaft to the drive spindle.
  • a development of the fuel pump according to the invention provides that the coupling end of the drive spindle has ground edges. Grinding the edges serves to avoid sharp edges that might otherwise damage the coupling element.
  • the coupling element is made of a plastic material by injection molding. In this way, the coupling element can be produced particularly inexpensively.
  • the coupling element is particularly preferred that the coupling element is made of a plastically deformable plastic material.
  • an at least low plastic deformability can initially be done a certain adjustment of the deformable plastic material to the drive spindle, possibly also to the motor shaft, whereby the power transmission is improved. Since the coupling element and the coupling-side end of the drive spindle lie flat against each other, a large area is present over which the torque introduced or the force is transmitted, whereby the force acting on the coupling element surface pressure is reduced and the service life of the coupling element is increased.
  • the screw pump of the fuel pump according to the invention preferably comprises the drive spindle and one or two driven spindles.
  • FIG. 1 is a sectional side view of a fuel pump 1 with a housing 2 in which an electric drive motor 3 is accommodated.
  • a motor shaft 4 of the drive motor 3 is coupled via a coupling element 5 with a drive spindle 6 of a screw pump 7, which additionally has a driven spindle (running spindle) 8.
  • the housing 2 has a suction-side inlet 9 and a pressure-side outlet 10.
  • fuel is sucked in the direction of the arrow 11 and moved in the axial direction by the feed chambers formed between the drive spindle 6, the screw spindle 7 and the surrounding housing, so that the fuel flows through the drive motor 3 and the fuel pump 1 at the pressure-side outlet 10 leaves.
  • FIG. 2 is a side view and shows the drive spindle 6.
  • the drive spindle 6 has a screw profile, at its coupling end 12 a flat axial surface 13 is formed.
  • the drive spindle 6 at its axial surface 13 opposite end has a convex shaped axial surface 14 which contacts a key in the mounted state.
  • the drive spindle 6 can be produced inexpensively, because the usual claws are dispensed with at one end, which otherwise require additional and expensive grinding operations.
  • the drive spindle 6 has a reduced compared to conventional drive spindles length, resulting in a material savings in the percent range.
  • FIG. 3 is a perspective view, in particular, the axial surface 13 is visible.
  • FIG. 4 a further perspective view of the drive spindle 6 and its flat axial surface thirteenth
  • FIG. 5 is an enlarged view of the coupling-side end 12 of the drive spindle 6 with mounted coupling element 5.
  • the coupling element 5 is made by injection molding of a plastic material.
  • the plastic material is such that it adapts to the outer contour of the end 12 of the drive spindle 6, so that it rests flat there, whereby the surface pressure is reduced. Via the contact surfaces at the end 12 of the drive spindle 6 and the coupling element, the torque introduced by the motor shaft 4 is introduced into the drive spindle 6 via the coupling element 5.
  • FIG. 6 is a perspective view and shows the coupling element 5 from the opposite side compared to FIG. 5 ,
  • the coupling element 5 is formed substantially equal to the outer contour of the coupling-side end 12 of the drive spindle 6. Accordingly, the coupling element 5 can be placed on the end 12, resulting in a positive connection and a frictional connection.
  • the coupling-side end 12 of the drive spindle 6 sharp edges remaining after the cutting of the blank are removed, whereby damage to the coupling element 5 is prevented. Furthermore, it is ensured by the deburring that in the opposite direction of rotation of the motor, a slippage of the coupling element is prevented via the drive spindle.
  • the coupling element 5 one recognizes the side facing the drive motor 3 side of the coupling element 5. This has a transversely to the longitudinal direction of the drive spindle 6 arranged slot 14, which is adapted to the size and shape of the motor shaft 4.
  • the coupling element 5 additionally serves to compensate for form tolerances and positional tolerances between the motor shaft 4 and the drive spindle 6.
  • FIG. 7 is a side view and shows similar to FIG. 2 the drive spindle 6, but with mounted coupling element. 5
  • FIG. 8 is a perspective view of the provided with the coupling element 5 drive spindle 6 of FIG. 7 ,
  • the main advantage of the fuel pump 1 is the fact that the drive spindle 6 can be produced inexpensively, since it dispenses with the production of claws. Instead, a coupling element 5 is used, which has a recess which is adapted to the outer contour of the coupling-side end 12 of the drive spindle 6. The opposite side of the coupling element 5 is coupled to the motor shaft 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Transmission Devices (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

Kraftstoffpumpe (1), mit einem Gehäuse (2), in dem ein elektrischer Antriebsmotor (3) aufgenommen ist, dessen Motorwelle (4) über ein Kupplungselement (5) mit einer Antriebsspindel (6) einer Schraubenspindelpumpe (7) gekoppelt ist, wobei die Antriebsspindel (6) an ihrem kupplungsseitigen Ende (12) eine im Wesentlichen ebene Axialfläche (13) aufweist.Fuel pump (1) having a housing (2) in which an electric drive motor (3) is accommodated, the motor shaft (4) via a coupling element (5) with a drive spindle (6) of a screw pump (7) is coupled, wherein the Drive spindle (6) at its coupling-side end (12) has a substantially planar axial surface (13).

Description

Die Erfindung betrifft eine Kraftstoffpumpe, mit einem Gehäuse, in dem ein elektrischer Antriebsmotor aufgenommen ist, dessen Motorwelle über ein Kupplungselement mit einer Antriebsspindel einer Schraubenspindelpumpe gekoppelt ist.The invention relates to a fuel pump, with a housing in which an electric drive motor is accommodated, the motor shaft is coupled via a coupling element with a drive spindle of a screw pump.

In der DE 41 23 384 A1 wird eine Kraftstoffpumpe beschrieben, deren elektrischer Antriebsmotor direkt mit einer Antriebsspindel verbunden ist, die eine Laufspindel antreibt, wodurch ein Fluid axial gefördert wird. Die Antriebsspindel und die Laufspindel bilden wandernde Förderräume für ein Fluid, insbesondere Kraftstoff, wodurch der Kraftstoff von einem saugseitigen Einlass zu einem druckseitigen Auslass gefördert wird. Der elektrische Antriebsmotor kann von dem Kraftstoff durchströmt werden, wodurch der Antriebsmotor gekühlt wird.In the DE 41 23 384 A1 a fuel pump is described, the electric drive motor is connected directly to a drive spindle which drives a spindle, whereby a fluid is axially conveyed. The drive spindle and the spindle form migratory delivery chambers for a fluid, in particular fuel, whereby the fuel is conveyed from a suction-side inlet to a pressure-side outlet. The electric drive motor can be traversed by the fuel, whereby the drive motor is cooled.

Aus der DE 43 08 755 A1 ist eine Klauenkupplung für eine Schraubenspindelpumpe bekannt. Die Klauenkupplung verbindet die Welle des antreibenden Motors mit der Antriebsspindel, wodurch Achsfehler und Winkelfehler zwischen Antriebswelle und Schraubenspindel ausgeglichen werden. An einem axialen Ende der Antriebsspindel sind zwei sich kreuzende Nuten eingeschliffen, wodurch zwei einander gegenüber liegende Klauen mit einem dreieckigen Querschnitt entstehen. Die dort vorgesehene Kupplung ist scheibenförmig ausgebildet und weist zwei Ausnehmungen auf, in die die dreieckigen Klauen eingreifen. Zusätzlich weist die Kupplung einen zentralen Schlitz auf, in den der Endabschnitt der Antriebswelle, der dort als Achsstummel bezeichnet wird, eingreift.From the DE 43 08 755 A1 is a jaw clutch for a screw pump known. The dog clutch connects the shaft of the driving motor to the drive spindle, which compensates for axis errors and angular errors between the drive shaft and the screw shaft. At one axial end of the drive spindle two intersecting grooves are ground, resulting in two opposing jaws having a triangular cross-section. The coupling provided there is disc-shaped and has two recesses into which engage the triangular claws. In addition, the coupling has a central slot in which the end portion of the drive shaft, which is referred to there as the stub axle, engages.

Obwohl sich derartige Kraftstoffpumpen mit einer Klauenkupplung seit langer Zeit bewährt haben, besteht Bedarf an einer verbesserten Kraftstoffpumpe, die kostengünstiger herstellbar ist.Although such fuel pumps have been proven with a dog clutch for a long time, there is a need for an improved fuel pump, which is cheaper to produce.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Kraftstoffpumpe anzugeben, die kostengünstiger herstellbar ist.The invention is therefore based on the object to provide a fuel pump that is less expensive to produce.

Zur Lösung dieser Aufgabe ist bei einer Kraftstoffpumpe der eingangs genannten Art erfindungsgemäß vorgesehen, dass die Antriebsspindel an ihrem kupplungsseitigen Ende eine im Wesentlichen ebene Axialfläche aufweist.To solve this problem, it is provided according to the invention in a fuel pump of the type mentioned that the drive spindle has a substantially flat axial surface at its coupling-side end.

Die Erfindung beruht auf der Erkenntnis, dass die Herstellungskosten einer Kraftstoffpumpe verringert werden können, wenn eine Antriebsspindel mit einer ebenen Axialfläche verwendet wird. Dadurch entfallen die vergleichsweise aufwendigen Schleifvorgänge, durch die die beiden dreieckigen Klauen erzeugt werden. Bisher waren dazu mehrere aufeinanderfolgende Schleifvorgänge erforderlich, um jeweils eine Seite der dreieckigen Klaue herzustellen. Erfindungsgemäß wird auf die Erzeugung der Klauen verzichtet, so dass lediglich ein Ablängen der hergestellten Antriebsspindel erforderlich ist. Dazu wird zunächst ein Rohling hergestellt, aus dem durch Teilen mehrere, beispielsweise zwei oder drei, separate Antriebsspindeln hergestellt werden können. Auf diese Weise kann die Herstellung der einzelnen Antriebsspindeln effizient und kostengünstig erfolgen. Ein weiterer Vorteil ist darin zu sehen, dass durch die entfallenen Klauen die Länge einer Antriebsspindel etwa 5 % kürzer ist im Vergleich zu einer herkömmlichen, Klauen aufweisenden Antriebsspindel. Dementsprechend ergibt sich dadurch eine beträchtliche Materialersparnis.The invention is based on the realization that the manufacturing costs of a fuel pump can be reduced if a drive spindle with a flat axial surface is used. This eliminates the relatively complex grinding operations by which the two triangular claws are generated. Previously, several consecutive grinding operations were required to make one side of the triangular jaw. According to the invention, the generation of the claws is dispensed with, so that only a cutting to length of the manufactured drive spindle is required. For this purpose, first a blank is produced from which several, for example two or three, separate drive spindles can be produced by dividing. In this way, the production of the individual drive spindles can be done efficiently and inexpensively. Another advantage is the fact that the length of a drive spindle is about 5% shorter by the dropped claws compared to a conventional, claw-bearing drive spindle. Accordingly, this results in a considerable saving of material.

Bei der erfindungsgemäßen Kraftstoffpumpe wird es besonders bevorzugt, dass sich die Axialfläche der Antriebsspindel über ihren gesamten Querschnitt erstreckt. Das bedeutet, dass die Antriebsspindel an ihrem kupplungsseitigen Ende lediglich eine einzige ebene Fläche aufweist, die einfach durch ein spanendes Verfahren hergestellt werden kann. Die ebene Axialfläche ergibt sich beim Zerteilen des Rohlings der Antriebsspindel in mehrere gleich lange Teile.In the fuel pump according to the invention, it is particularly preferred that the axial surface of the drive spindle extends over its entire cross section. This means that the drive spindle has at its coupling end only a single flat surface that can be easily produced by a machining process. The flat axial surface is obtained when dividing the blank of the drive spindle into several equal parts.

Eine besonders zuverlässige Funktion der erfindungsgemäßen Kraftstoffpumpe kaum sichergestellt werden, wenn eine Seite des Kupplungselements gegengleich zu dem kupplungsseitigen Ende der Antriebsspindel ausgebildet ist. Diese Seite des Kupplungselements ist dementsprechend als Negativform der Antriebsspindel ausgebildet und weist somit eine Aussparung auf, in die das kupplungsseitige Ende der Antriebsspindel im montierten Zustand eingreift. Dadurch sind das Kupplungselement und das kupplungsseitige Ende der Antriebsspindel formschlüssig und/oder kraftschlüssig miteinander verbunden. Das Kupplungselement ist so ausgebildet, dass es in der Lage ist, das von der Motorwelle abgegebene Drehmoment auf die Antriebsspindel zu übertragen.A particularly reliable function of the fuel pump according to the invention can hardly be ensured if one side of the coupling element is formed opposite to the coupling end of the drive spindle. This side of the coupling element is accordingly formed as a negative shape of the drive spindle and thus has a recess into which the coupling side End of the drive spindle engages in the assembled state. As a result, the coupling element and the coupling-side end of the drive spindle are positively and / or non-positively connected to each other. The coupling element is designed so that it is able to transmit the torque output by the motor shaft to the drive spindle.

Eine Weiterbildung der erfindungsgemäßen Kraftstoffpumpe sieht vor, dass das kupplungsseitige Ende der Antriebsspindel abgeschliffene Kanten aufweist. Das Schleifen der Kanten dient dazu, scharfe Kanten zu vermeiden, die ansonsten gegebenenfalls das Kupplungselement beschädigen könnten.A development of the fuel pump according to the invention provides that the coupling end of the drive spindle has ground edges. Grinding the edges serves to avoid sharp edges that might otherwise damage the coupling element.

Bei der erfindungsgemäßen Kraftstoffpumpe wird es bevorzugt, dass das Kupplungselement aus einem Kunststoffmaterial durch Spritzgießen hergestellt ist. Auf diese Weise kann das Kupplungselement besonders kostengünstig hergestellt werden. In diesem Zusammenhang wird es besonders bevorzugt, dass das Kupplungselement aus einem plastisch verformbaren Kunststoffmaterial hergestellt ist. Durch eine zumindest geringe plastische Verformbarkeit kann anfänglich eine gewisse Anpassung des verformbaren Kunststoffmaterials an die Antriebsspindel, gegebenenfalls auch an die Motorwelle, erfolgen, wodurch die Kraftübertragung verbessert wird. Da das Kupplungselement und das kupplungsseitige Ende der Antriebsspindel flächig aneinander anliegen, ist eine große Fläche vorhanden, über die das eingeleitete Drehmoment bzw. die Kraft übertragen wird, wodurch die auf das Kupplungselement wirkende Flächenpressung verringert und die Standzeit des Kupplungselements erhöht wird.In the fuel pump according to the invention, it is preferred that the coupling element is made of a plastic material by injection molding. In this way, the coupling element can be produced particularly inexpensively. In this context, it is particularly preferred that the coupling element is made of a plastically deformable plastic material. By an at least low plastic deformability can initially be done a certain adjustment of the deformable plastic material to the drive spindle, possibly also to the motor shaft, whereby the power transmission is improved. Since the coupling element and the coupling-side end of the drive spindle lie flat against each other, a large area is present over which the torque introduced or the force is transmitted, whereby the force acting on the coupling element surface pressure is reduced and the service life of the coupling element is increased.

Die Schraubenspindelpumpe der erfindungsgemäßen Kraftstoffpumpe umfasst vorzugsweise die Antriebsspindel und eine oder zwei angetriebene Spindeln.The screw pump of the fuel pump according to the invention preferably comprises the drive spindle and one or two driven spindles.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnungen erläutert. Die Zeichnungen sind schematische Darstellungen:

Figur 1
eine geschnittene Seitenansicht einer erfindungsgemäßen Kraftstoffpumpe;
Figur 2
eine Seitenansicht einer Antriebsspindel;
Figur 3
eine perspektivische Ansicht der in Figur 2 gezeigten Antriebsspindel;
Figur 4
eine weitere perspektivische Ansicht der in Figur 2 gezeigten Antriebsspindel;
Figur 5
ein Detail des Endes der Antriebsspindel mit montiertem Kupplungselement;
Figur 6
die entgegengesetzte Seite des in Figur 5 gezeigten Kupplungselements;
Figur 7
eine Seitenansicht der Antriebsspindel mit montiertem Kupplungselement; und
Figur 8
eine perspektivische Ansicht der in Figur 6 gezeigten Antriebsspindel mit montiertem Kupplungselement.
The invention will be explained below with reference to an embodiment with reference to the drawings. The drawings are schematic representations:
FIG. 1
a sectional side view of a fuel pump according to the invention;
FIG. 2
a side view of a drive spindle;
FIG. 3
a perspective view of in FIG. 2 shown drive spindle;
FIG. 4
another perspective view of in FIG. 2 shown drive spindle;
FIG. 5
a detail of the end of the drive spindle with mounted coupling element;
FIG. 6
the opposite side of the in FIG. 5 shown coupling element;
FIG. 7
a side view of the drive spindle with mounted coupling element; and
FIG. 8
a perspective view of in FIG. 6 shown drive spindle with mounted coupling element.

Figur 1 ist eine geschnittene Seitenansicht einer Kraftstoffpumpe 1 mit einem Gehäuse 2, in dem ein elektrischer Antriebsmotor 3 aufgenommen ist. Eine Motorwelle 4 des Antriebsmotors 3 ist über ein Kupplungselement 5 mit einer Antriebsspindel 6 einer Schraubenspindelpumpe 7 gekoppelt, die zusätzlich eine angetriebene Spindel (Laufspindel) 8 aufweist. Das Gehäuse 2 weist einen saugseitigen Einlass 9 und einen druckseitigen Auslass 10 auf. Beim Betrieb wird Kraftstoff in Richtung des Pfeils 11 angesaugt und durch die zwischen der Antriebsspindel 6, der Schraubenspindel 7 und dem umgebenden Gehäuse gebildeten Förderkammern in Axialrichtung bewegt, so dass der Kraftstoff den Antriebsmotor 3 durchströmt und die Kraftstoffpumpe 1 am druckseitigen Auslass 10 verlässt. Durch eine entsprechende Wahl der Länge der Spindeln, der Motorleistung und der Drehzahl kann ein gewünschtes Fördervolumen und ein gewünschter Druck festgelegt werden. FIG. 1 is a sectional side view of a fuel pump 1 with a housing 2 in which an electric drive motor 3 is accommodated. A motor shaft 4 of the drive motor 3 is coupled via a coupling element 5 with a drive spindle 6 of a screw pump 7, which additionally has a driven spindle (running spindle) 8. The housing 2 has a suction-side inlet 9 and a pressure-side outlet 10. During operation, fuel is sucked in the direction of the arrow 11 and moved in the axial direction by the feed chambers formed between the drive spindle 6, the screw spindle 7 and the surrounding housing, so that the fuel flows through the drive motor 3 and the fuel pump 1 at the pressure-side outlet 10 leaves. By a suitable choice of the length of the spindles, the engine power and the speed, a desired delivery volume and a desired pressure can be set.

Figur 2 ist eine Seitenansicht und zeigt die Antriebsspindel 6. Die Antriebsspindel 6 weist ein Schraubenprofil auf, an ihrem kupplungsseitigen Ende 12 ist eine ebene Axialfläche 13 ausgebildet. In Figur 2 erkennt man, dass die Antriebsspindel 6 an ihrem der Axialfläche 13 entgegengesetzten Ende eine konvex geformte Axialfläche 14 aufweist, die im montierten Zustand eine Passfeder berührt. Die Antriebsspindel 6 kann kostengünstig hergestellt werden, da auf die bisher üblichen Klauen an einem Ende verzichtet wird, die ansonsten zusätzliche und aufwendige Schleifvorgänge erfordern. Zudem weist die Antriebsspindel 6 eine im Vergleich zu herkömmlichen Antriebsspindeln verringerte Länge auf, wodurch sich eine Materialersparnis im Prozentbereich ergibt. FIG. 2 is a side view and shows the drive spindle 6. The drive spindle 6 has a screw profile, at its coupling end 12 a flat axial surface 13 is formed. In FIG. 2 it can be seen that the drive spindle 6 at its axial surface 13 opposite end has a convex shaped axial surface 14 which contacts a key in the mounted state. The drive spindle 6 can be produced inexpensively, because the usual claws are dispensed with at one end, which otherwise require additional and expensive grinding operations. In addition, the drive spindle 6 has a reduced compared to conventional drive spindles length, resulting in a material savings in the percent range.

Figur 3 ist eine perspektivische Ansicht, in der insbesondere die Axialfläche 13 sichtbar ist. FIG. 3 is a perspective view, in particular, the axial surface 13 is visible.

In ähnlicher Weise zeigt Figur 4 eine weitere perspektivische Ansicht der Antriebsspindel 6 und ihrer ebenen Axialfläche 13.In a similar way shows FIG. 4 a further perspective view of the drive spindle 6 and its flat axial surface thirteenth

Figur 5 ist eine vergrößerte Ansicht des kupplungsseitigen Endes 12 der Antriebsspindel 6 mit montiertem Kupplungselement 5. Das Kupplungselement 5 ist im Spritzgießverfahren aus einem Kunststoffmaterial hergestellt. Das Kunststoffmaterial ist so beschaffen, dass es sich an die Außenkontur des Endes 12 der Antriebsspindel 6 anpasst, so dass es dort flächig anliegt, wodurch die Flächenpressung verringert wird. Über die Berührflächen am Ende 12 der Antriebsspindel 6 und dem Kupplungselement wird das von der Motorwelle 4 eingeleitete Drehmoment über das Kupplungselement 5 in die Antriebsspindel 6 eingeleitet. FIG. 5 is an enlarged view of the coupling-side end 12 of the drive spindle 6 with mounted coupling element 5. The coupling element 5 is made by injection molding of a plastic material. The plastic material is such that it adapts to the outer contour of the end 12 of the drive spindle 6, so that it rests flat there, whereby the surface pressure is reduced. Via the contact surfaces at the end 12 of the drive spindle 6 and the coupling element, the torque introduced by the motor shaft 4 is introduced into the drive spindle 6 via the coupling element 5.

Figur 6 ist eine perspektivische Ansicht und zeigt das Kupplungselement 5 von der entgegengesetzten Seite im Vergleich zu Figur 5. In Figur 6 erkennt man, dass das Kupplungselement 5 im Wesentlichen gegengleich zur Außenkontur des kupplungsseitigen Endes 12 der Antriebsspindel 6 ausgebildet ist. Dementsprechend kann das Kupplungselement 5 so auf das Ende 12 aufgesetzt werden, dass sich ein Formschluss und ein Kraftschluss ergeben. An dem kupplungsseitigen Ende 12 der Antriebsspindel 6 werden scharfe Kanten, die nach dem Zerteilen des Rohlings verbleiben, entfernt, wodurch eine Beschädigung des Kupplungselements 5 verhindert wird. Des Weiteren wird durch das Entgraten sichergestellt, dass bei entgegen gesetzter Drehrichtung des Motors, ein Rutschen des Kupplungselements über die Antriebsspindel verhindert wird. In Figur 5 erkennt man die dem Antriebsmotor 3 zugewandte Seite des Kupplungselements 5. Dieses weist einen quer zur Längsrichtung der Antriebsspindel 6 angeordneten Schlitz 14 auf, der an die Größe und die Form der Motorwelle 4 angepasst ist. Das Kupplungselement 5 dient zusätzlich zum Ausgleich von Formtoleranzen und Lagetoleranzen zwischen der Motorwelle 4 und der Antriebsspindel 6. FIG. 6 is a perspective view and shows the coupling element 5 from the opposite side compared to FIG. 5 , In FIG. 6 it can be seen that the coupling element 5 is formed substantially equal to the outer contour of the coupling-side end 12 of the drive spindle 6. Accordingly, the coupling element 5 can be placed on the end 12, resulting in a positive connection and a frictional connection. At the coupling-side end 12 of the drive spindle 6, sharp edges remaining after the cutting of the blank are removed, whereby damage to the coupling element 5 is prevented. Furthermore, it is ensured by the deburring that in the opposite direction of rotation of the motor, a slippage of the coupling element is prevented via the drive spindle. In FIG. 5 one recognizes the side facing the drive motor 3 side of the coupling element 5. This has a transversely to the longitudinal direction of the drive spindle 6 arranged slot 14, which is adapted to the size and shape of the motor shaft 4. The coupling element 5 additionally serves to compensate for form tolerances and positional tolerances between the motor shaft 4 and the drive spindle 6.

Figur 7 ist eine Seitenansicht und zeigt ähnlich wie Figur 2 die Antriebsspindel 6, jedoch mit montiertem Kupplungselement 5. FIG. 7 is a side view and shows similar to FIG. 2 the drive spindle 6, but with mounted coupling element. 5

Figur 8 ist eine perspektivische Ansicht der mit dem Kupplungselement 5 versehenen Antriebsspindel 6 von Figur 7. FIG. 8 is a perspective view of the provided with the coupling element 5 drive spindle 6 of FIG. 7 ,

Der wesentliche Vorteil der Kraftstoffpumpe 1 ist darin zu sehen, dass die Antriebsspindel 6 kostengünstig hergestellt werden kann, da auf die Herstellung von Klauen verzichtet wird. Stattdessen wird ein Kupplungselement 5 verwendet, das eine Ausnehmung aufweist, die an die Außenkontur des kupplungsseitigen Endes 12 der Antriebsspindel 6 angepasst ist. Die entgegengesetzte Seite des Kupplungselements 5 ist mit der Motorwelle 4 gekoppelt.The main advantage of the fuel pump 1 is the fact that the drive spindle 6 can be produced inexpensively, since it dispenses with the production of claws. Instead, a coupling element 5 is used, which has a recess which is adapted to the outer contour of the coupling-side end 12 of the drive spindle 6. The opposite side of the coupling element 5 is coupled to the motor shaft 4.

Claims (8)

Kraftstoffpumpe (1), mit einem Gehäuse (2), in dem ein elektrischer Antriebsmotor (3) aufgenommen ist, dessen Motorwelle (4) über ein Kupplungselement (5) mit einer Antriebsspindel (6) einer Schraubenspindelpumpe (7) gekoppelt ist, dadurch gekennzeichnet, dass die Antriebsspindel (6) an ihrem kupplungsseitigen Ende (12) eine im Wesentlichen ebene Axialfläche (13) aufweist.Fuel pump (1), with a housing (2) in which an electric drive motor (3) is accommodated, the motor shaft (4) via a coupling element (5) with a drive spindle (6) of a screw pump (7) is coupled, characterized in that the drive spindle (6) has a substantially flat axial surface (13) at its coupling-side end (12). Kraftstoffpumpe nach Anspruch 1, dadurch gekennzeichnet, dass sich die Axialfläche (13) über den gesamten Querschnitt der Antriebsspindel (6) erstreckt.Fuel pump according to claim 1, characterized in that the axial surface (13) extends over the entire cross section of the drive spindle (6). Kraftstoffpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine Seite des Kupplungselements (5) gegengleich zu dem kupplungsseitigen Ende (12) der Antriebsspindel (6) ausgebildet ist.Fuel pump according to claim 1 or 2, characterized in that one side of the coupling element (5) opposite to the coupling-side end (12) of the drive spindle (6) is formed. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Kupplungselement (5) und das kupplungsseitige Ende (12) der Antriebsspindel (6) formschlüssig und/oder kraftschlüssig miteinander verbunden sind.Fuel pump according to one of the preceding claims, characterized in that the coupling element (5) and the coupling-side end (12) of the drive spindle (6) are positively and / or non-positively connected to each other. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das kupplungsseitige Ende (12) der Antriebsspindel (6) abgeschliffene Kanten aufweist.Fuel pump according to one of the preceding claims, characterized in that the coupling-side end (12) of the drive spindle (6) has ground edges. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Kupplungselement (5) aus einem Kunststoffmaterial durch Spritzgießen hergestellt ist.Fuel pump according to one of the preceding claims, characterized in that the coupling element (5) is made of a plastic material by injection molding. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Kupplungselement (5) aus einem plastisch verformbaren Kunststoffmaterial hergestellt ist.Fuel pump according to one of the preceding claims, characterized in that the coupling element (5) is made of a plastically deformable plastic material. Kraftstoffpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sie die Antriebsspindel (6) und eine oder zwei angetriebene Spindeln (8) aufweist.Fuel pump according to one of the preceding claims, characterized in that it comprises the drive spindle (6) and one or two driven spindles (8).
EP16150404.8A 2015-02-02 2016-01-07 Fuel pump Ceased EP3051133A1 (en)

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DE102015101443.2A DE102015101443B3 (en) 2015-02-02 2015-02-02 Fuel pump

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CN105840498A (en) 2016-08-10
JP2016142269A (en) 2016-08-08
US20160222964A1 (en) 2016-08-04
DE102015101443B3 (en) 2016-05-12
JP6224747B2 (en) 2017-11-01

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