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EP1813009A1 - Fuel pump - Google Patents

Fuel pump

Info

Publication number
EP1813009A1
EP1813009A1 EP05794654A EP05794654A EP1813009A1 EP 1813009 A1 EP1813009 A1 EP 1813009A1 EP 05794654 A EP05794654 A EP 05794654A EP 05794654 A EP05794654 A EP 05794654A EP 1813009 A1 EP1813009 A1 EP 1813009A1
Authority
EP
European Patent Office
Prior art keywords
brushes
fuel pump
commutator
stator
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.)
Withdrawn
Application number
EP05794654A
Other languages
German (de)
French (fr)
Inventor
Eberhard Geissel
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.)
Continental Automotive GmbH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1813009A1 publication Critical patent/EP1813009A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/148—Slidably supported brushes
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
    • H02K13/006—Structural associations of commutators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to a fuel pump for conveying fuel from a fuel tank of a motor vehicle with a pump stage driven by an electric motor, with a rotatably mounted shaft supporting a rotor of the pump stage, with a rotor of the electric motor rotatably mounted on the shaft and radially outward
  • the rotor arranged stator and with parallel to the shaft against a commutator biased brushes for contacting zu ⁇ least one arranged on the rotor coil.
  • Such fuel pumps are widely used in today's motor vehicles and are known in practice.
  • two brushes of the electric motor are normally biased against the commutator.
  • the electric motor has axial guides on the side of the commutator facing away from the rotor. These axial guides are usually made of an electrically conductive material and are electrically connected to connecting contacts arranged on a connecting piece covering the fuel pump.
  • the known fuel pump essentially consists of three axially superposed sections, namely the pump stage, the stator and the rotor having section of the electric motor and the connection piece for the electric motor zu ⁇ together.
  • a disadvantage of the known fuel pump is that it has a very large height. However, this is disadvantageous in the case of today ⁇ gen, usually only a very small height having Kraft ⁇ containers, since in such Kraftstoffbe ⁇ containers the known fuel pump can not be mounted.
  • the invention is based on the problem to make a Kraftstoffpum ⁇ pe of the type mentioned so that it has a very low overall height.
  • the length of the fuel pump according to the invention is essentially determined by the length of the rotor of the electric motor with its bearings and by the pump stage.
  • the brushes do not, in contrast to the be ⁇ knew fuel pump to an increase in height as they are ordered to ⁇ adjacent the rotor and at the height of the rotor.
  • the fuel pump according to the invention thereby has a particularly low overall height.
  • the brushes could be radially biased against a barrel commutator.
  • the inventive fuel pump is particularly compact, when the commutator is designed disc-shaped and extends with its outer edge to over the stator and when the brushes are arranged in the stator. By this design, in addition to the axial also the radial dimensions of the electric motor are kept particularly low.
  • the fuel pump of the invention designed to constructive ⁇ tive particularly simple if the brushes are arranged in a pocket of the stator.
  • the assembly of the fuel pump according to the invention is particularly simple if spring elements for biasing the brushes against the commutator are arranged behind the brushes, as seen from the commutator.
  • the spring elements are each formed as a compression spring.
  • magnetic shells of the stator or supports arranged between two magnetic shells support the spring elements for biasing the brushes.
  • the space requirement of the brushes in the region of the stator can be kept particularly low, according to another advantageous development of the invention, when the spring elements engage around the commutator and the brushes.
  • the commutator and the brushes are viewed from the rotor radially outward.
  • the bias of the brush on a particularly small space in the region of the stator In the simplest case, the spring elements are C-shaped in a soan ⁇ view.
  • a housing cover covering the electric motor generally has a large distance from the commutator in the known fuel pumps. According to another advantageous development of the invention, such a distance can be easily avoided if a housing cover aufwei ⁇ a storage for the shaft directly opposite the commutator.
  • FIG. 1 shows a schematic longitudinal section through a fuel pump according to the invention
  • Figure 2 shows schematically a partial section through the erfindungs ⁇ modern fuel pump of Figure 1 along the Li ⁇ never II - II,
  • FIG. 3 schematically shows a partial section through a further embodiment of the fuel pump according to the invention
  • FIG. 4 schematically shows a partial section through a further embodiment of the fuel pump according to the invention.
  • the electric motor 1 shows a fuel pump with a romotor by a Elect ⁇ 1 driven pump stage 2.
  • the electric motor 1 comprises a housing 3 mounted in a stator 4 and a on a shaft 5 rotatably mounted rotor 6.
  • the impeller stage 2 has an impeller 7 arranged on the shaft 5 in a rotationally fixed manner.
  • the impeller 7 rotates between two housing parts 10, 11 having an inlet 8 and an outlet 9.
  • the housing 3 of the fuel pump 2 is the inlet 8 having housing part 10 of the pump stage 2 and connected to a covering the electric motor 1 housing cover 12.
  • the housing cover 12 has an outlet 13 and a La ⁇ delay 14 of one end of the shaft 5.
  • the other end of the shaft 5, a bearing 15 in which the inlet 8 having Ge casing part 10 of the pump stage 2.
  • the pump stage 2 is formed as generally known Side channel pump formed. For a drive of the electric motor 1, the pump stage promotes 2 force ⁇ material from the inlet 8 through the outlet 9 and the electric motor 1 to the outlet 13. At the outlet 13 can be connected a flow line, on the Kraft ⁇ material from a fuel tank is promoted to a Brennkraftmaschi ⁇ ne. To simplify the drawing, the fuel tank, the internal combustion engine and the supply line are not shown.
  • the electric motor 1 has a commutator 16 mounted on the shaft 5 against which two brushes 17 are biased.
  • the commutator 16 is disc-shaped and guided with its outer edge to over the stator 4, in which the brushes 17 are arranged displaceably.
  • the brushes 17 are formed for example as charcoal pins and are biased by Fe ⁇ derettin 18.
  • the spring elements 18 are supported on a support 19 fixed in the housing 3.
  • the commutator 16 is electrically connected to coils of the rotor 6, not shown.
  • the brushes 17 are transferred to the the housing cover 12 arranged connection contacts 20 with electrical ⁇ schem powered.
  • the connection contacts 20 are arranged radially next to the commutator 16 and therefore have no influence on the axial height of the fuel pump.
  • FIG. 2 shows a sectional view through the fuel pump from FIG. 1 along the line II-II in the region of one of the brushes 17. It can be seen here that the brush 17 is guided in a gap between two magnetic shells 21 of the stator 4. The edges of the magnetic shells 21 thus form a guide 22 of the brush 17.
  • FIG. 3 shows, from the perspective shown in FIG. 2, a further embodiment of the fuel pump in which the stator 4 has a pocket 23 for receiving and as a guide 24 of the brush 17.
  • the bottom of the pocket 23 forms a support 25 for supporting the spring element 18th
  • FIG. 4 shows a further embodiment of the fuel pump, in which the commutator 16 is encompassed by a C-shaped spring element 26.
  • One end of the spring element 26 biases the brush 17 against the commutator 16, while the other end is supported on a support 27 of the housing 3 shown in FIG.
  • the spring element 26 is shown rotated in the plane of the drawing.
  • the stator 4 has a recess 28 as a guide 29 of the brush 17th

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Dc Machiner (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The invention relates to a fuel pump comprising a pump stage (2) driven by an electric motor (1). Brushes (17) for contacting a commutator (16) are radially arranged next to a rotor (6). To this end, a stator (4) encircling the rotor (6) has pockets for accommodating these brushes (17). Connecting contacts (20) electrically connected to the brushes (17) are radially arranged next to the commutator (16). The fuel pump has a particularly small overall height.

Description

Beschreibungdescription
KraftstoffpumpeFuel pump
Die Erfindung betrifft eine Kraftstoffpumpe zur Förderung von Kraftstoff aus einem Kraftstoffbehälter eines Kraftfahrzeuges mit einer von einem Elektromotor angetriebenen Pumpenstufe, mit einer drehbar gelagerten, ein Laufrad der Pumpenstufe halternden Welle, mit einem drehfest auf der Welle angeordne- ten Rotor des Elektromotors und einem radial außerhalb des Rotors angeordneten Stator und mit parallel zur Welle gegen einen Kommutator vorgespannten Bürsten zur Kontaktierung zu¬ mindest einer auf dem Rotor angeordneten Spule.The invention relates to a fuel pump for conveying fuel from a fuel tank of a motor vehicle with a pump stage driven by an electric motor, with a rotatably mounted shaft supporting a rotor of the pump stage, with a rotor of the electric motor rotatably mounted on the shaft and radially outward The rotor arranged stator and with parallel to the shaft against a commutator biased brushes for contacting zu¬ least one arranged on the rotor coil.
Solche Kraftstoffpumpen werden in heutigen Kraftfahrzeugen häufig eingesetzt und sind aus der Praxis bekannt. In der Re¬ gel sind zwei Bürsten des Elektromotors senkrecht gegen den Kommutator vorgespannt. Zur Führung der Bürsten weist der Elektromotor auf der dem Rotor abgewandten Seite des Kommuta- tors Axialführungen auf. Diese Axialführungen sind meist aus einem elektrisch leitfähigen Material gefertigt und mit auf einem die Kraftstoffpumpe abdeckenden Anschlussstück angeord¬ neten Anschlusskontakten elektrisch verbunden. Damit setzt sich die bekannte Kraftstoffpumpe im Wesentlichen aus drei axial übereinander angeordneten Abschnitten, nämlich der Pum¬ penstufe, den Stator und den Rotor aufweisenden Abschnitt des Elektromotors und dem Anschlussstück für den Elektromotor zu¬ sammen.Such fuel pumps are widely used in today's motor vehicles and are known in practice. In the re ¬ gel two brushes of the electric motor are normally biased against the commutator. To guide the brushes, the electric motor has axial guides on the side of the commutator facing away from the rotor. These axial guides are usually made of an electrically conductive material and are electrically connected to connecting contacts arranged on a connecting piece covering the fuel pump. Thus, the known fuel pump essentially consists of three axially superposed sections, namely the pump stage, the stator and the rotor having section of the electric motor and the connection piece for the electric motor zu¬ together.
Nachteilig bei der bekannten Kraftstoffpumpe ist, dass sie eine sehr große Bauhöhe aufweist. Dies ist jedoch bei heuti¬ gen, meist nur eine sehr geringe Bauhöhe aufweisenden Kraft¬ stoffbehältern von Nachteil, da sich in solchen Kraftstoffbe¬ hältern die bekannte Kraftstoffpumpe nicht montieren lässt. Der Erfindung liegt das Problem zugrunde, eine Kraftstoffpum¬ pe der eingangs genannten Art so zu gestalten, dass sie eine besonders geringe Bauhöhe aufweist.A disadvantage of the known fuel pump is that it has a very large height. However, this is disadvantageous in the case of today ¬ gen, usually only a very small height having Kraft ¬ containers, since in such Kraftstoffbe¬ containers the known fuel pump can not be mounted. The invention is based on the problem to make a Kraftstoffpum¬ pe of the type mentioned so that it has a very low overall height.
Dieses Problem wird erfindungsgemäß dadurch gelöst, dass die Bürsten radial neben der Spule des Rotors angeordnet sind.This problem is inventively solved in that the brushes are arranged radially adjacent to the coil of the rotor.
Durch diese Gestaltung wird die Länge der erfindungsgemäßen Kraftstoffpumpe im Wesentlichen durch die Länge des Rotors des Elektromotors mit dessen Lagerungen und durch die Pumpen¬ stufe festgelegt. Die Bürsten führen im Gegensatz zu der be¬ kannten Kraftstoffpumpe nicht zu einer Erhöhung der Bauhöhe, da sie neben dem Rotor und damit auf der Höhe des Rotors an¬ geordnet sind. Die erfindungsgemäße Kraftstoffpumpe hat hier- durch eine besonders geringe Bauhöhe.As a result of this design, the length of the fuel pump according to the invention is essentially determined by the length of the rotor of the electric motor with its bearings and by the pump stage. The brushes do not, in contrast to the be¬ knew fuel pump to an increase in height as they are ordered to ¬ adjacent the rotor and at the height of the rotor. The fuel pump according to the invention thereby has a particularly low overall height.
Die Bürsten könnten beispielsweise radial gegen einen tonnen- förmigen Kommutator vorgespannt sein. Dies führt jedoch zu großen radialen Abmessungen des Elektromotors. Die erfin- dungsgemäße Kraftstoffpumpe gestaltet sich jedoch besonders kompakt, wenn der Kommutator scheibenförmig gestaltet ist und mit seinem äußeren Rand bis über den Stator reicht und wenn die Bürsten im Stator angeordnet sind. Durch diese Gestaltung werden neben den axialen zudem auch die radialen Abmessungen des Elektromotors besonders gering gehalten.For example, the brushes could be radially biased against a barrel commutator. However, this leads to large radial dimensions of the electric motor. However, the inventive fuel pump is particularly compact, when the commutator is designed disc-shaped and extends with its outer edge to over the stator and when the brushes are arranged in the stator. By this design, in addition to the axial also the radial dimensions of the electric motor are kept particularly low.
Die erfindungsgemäße Kraftstoffpumpe gestaltet sich konstruk¬ tiv besonders einfach, wenn die Bürsten in einer Tasche des Stators angeordnet sind.The fuel pump of the invention designed to constructive ¬ tive particularly simple if the brushes are arranged in a pocket of the stator.
Eine Beeinträchtigung der Funktion des Stators durch die An¬ ordnung der Bürsten lässt sich gemäß einer anderen vorteil¬ haften Weiterbildung der Erfindung einfach vermeiden, wenn die Bürsten in einem Spalt zwischen zwei benachbarten Magnet- schalen des Stators angeordnet sind. Da ein solcher Spalt zwischen benachbarten Magnetschalen meist ohnehin vorhanden ist, werden durch die Anordnung der Bürsten in dem Spalt eine Verkleinerung der Magnetschalen und damit eine Beeinträchti¬ gung der Funktion des Stators weitgehend vermieden.An impairment of the function of the stator by the arrangement of the brushes can be easily avoided, according to another advantageous development of the invention, if the brushes are arranged in a gap between two adjacent magnetic shells of the stator. Because such a gap between adjacent magnetic shells is usually present anyway, the arrangement of the brushes in the gap a reduction of the magnetic shells and thus a Beeinträchti¬ tion of the function of the stator are largely avoided.
Zur weiteren Verringerung der axialen Abmessungen der erfin¬ dungsgemäßen Kraftstoffpumpe trägt es bei, wenn zur Verbin¬ dung der Bürsten mit einem Stromnetz vorgesehene Anschluss¬ kontakte des Elektromotors radial neben dem Kommutator oder dem Stator angeordnet sind.To further reduce the axial dimensions of the inventive fuel pump, it is beneficial if the Verbin ¬ dung of the brushes to a power grid provided Anschluss¬ contacts of the electric motor are arranged radially next to the commutator or the stator.
Die Montage der erfindungsgemäßen Kraftstoffpumpe gestaltet sich besonders einfach, wenn Federelemente zur Vorspannung der Bürsten gegen den Kommutator von dem Kommutator aus gese- hen hinter den Bürsten angeordnet sind. Vorzugsweise sind die Federelemente hierbei jeweils als Druckfeder ausgebildet. Durch diese Gestaltung lassen sich die Bauteile der Kraft¬ stoffpumpe einfach axial montieren.The assembly of the fuel pump according to the invention is particularly simple if spring elements for biasing the brushes against the commutator are arranged behind the brushes, as seen from the commutator. Preferably, the spring elements are each formed as a compression spring. By means of this design, the components of the fuel pump can be easily mounted axially.
Zur weiteren Vereinfachung der Montage der erfindungsgemäßen Kraftstoffpumpe trägt es bei, wenn Magnetschalen des Stators oder zwischen zwei Magnetschalen angeordnete Stützen die Fe¬ derelemente zur Vorspannung der Bürsten abstützen.To further simplify the assembly of the fuel pump according to the invention, it is helpful if magnetic shells of the stator or supports arranged between two magnetic shells support the spring elements for biasing the brushes.
Der Platzbedarf der Bürsten in dem Bereich des Stators lässt sich gemäß einer anderen vorteilhaften Weiterbildung der Er¬ findung besonders gering halten, wenn die Federelemente den Kommutator und die Bürsten umgreifen. Vorzugsweise werden der Kommutator und die Bürsten von dem Rotor aus gesehen radial außen umgriffen. Hierdurch weist die Vorspannung der Bürsten einen besonders geringen Bauraum im Bereich des Stators auf. Im einfachsten Fall sind die Federelemente in einer Seitenan¬ sicht C-förmig gestaltet. Ein den Elektromotor abdeckender Gehäusedeckel weist bei den bekannten Kraftstoffpumpen in der Regel einen großen Abstand zu dem Kommutator auf. Ein solcher Abstand lässt sich gemäß einer anderen vorteilhaften Weiterbildung der Erfindung ein- fach vermeiden, wenn ein eine Lagerung für die Welle aufwei¬ sender Gehäusedeckel dem Kommutator unmittelbar gegenüber¬ steht .The space requirement of the brushes in the region of the stator can be kept particularly low, according to another advantageous development of the invention, when the spring elements engage around the commutator and the brushes. Preferably, the commutator and the brushes are viewed from the rotor radially outward. As a result, the bias of the brush on a particularly small space in the region of the stator. In the simplest case, the spring elements are C-shaped in a Seitenan¬ view. A housing cover covering the electric motor generally has a large distance from the commutator in the known fuel pumps. According to another advantageous development of the invention, such a distance can be easily avoided if a housing cover aufwei¬ a storage for the shaft directly opposite the commutator.
Zur weiteren Vereinfachung des konstruktiven Aufbaus der er- findungsgemäßen Kraftstoffpumpe trägt es bei, wenn Führungen für die Bürsten parallel zu der Welle angeordnet sind.To further simplify the structural design of the fuel pump according to the invention, it is helpful if guides for the brushes are arranged parallel to the shaft.
Die Erfindung lässt zahlreiche Ausführungsformen zu. Zur wei¬ teren Verdeutlichung ihres Grundprinzips sind mehrere davon in der Zeichnung dargestellt und werden nachfolgend beschrie¬ ben. Diese zeigt inThe invention allows numerous embodiments. Wei¬ to direct illustrate its basic principle, several of these are illustrated in the drawings and will hereinafter beschrie ¬ ben. This shows in
Figur 1 schematisch einen Längsschnitt durch eine erfin¬ dungsgemäße Kraftstoffpumpe,FIG. 1 shows a schematic longitudinal section through a fuel pump according to the invention,
Figur 2 schematisch einen Teilschnitt durch die erfindungs¬ gemäße Kraftstoffpumpe aus Figur 1 entlang der Li¬ nie II - II,Figure 2 shows schematically a partial section through the erfindungs¬ modern fuel pump of Figure 1 along the Li ¬ never II - II,
Figur 3 schematisch einen Teilschnitt durch eine weitere Ausführungsform der erfindungsgemäßen Kraftstoff¬ pumpe,FIG. 3 schematically shows a partial section through a further embodiment of the fuel pump according to the invention,
Figur 4 schematisch einen Teilschnitt durch eine weitere Ausführungsform der erfindungsgemäßen Kraftstoff¬ pumpe.FIG. 4 schematically shows a partial section through a further embodiment of the fuel pump according to the invention.
Figur 1 zeigt eine Kraftstoffpumpe mit einer von einem Elekt¬ romotor 1 angetriebenen Pumpenstufe 2. Der Elektromotor 1 weist einen in einem Gehäuse 3 befestigten Stator 4 und einen auf einer Welle 5 drehfest angeordneten Rotor 6 auf. Die Pum¬ penstufe 2 hat ein auf der Welle 5 drehfest angeordnetes Laufrad 7. Das Laufrad 7 dreht sich zwischen zwei, einen Ein- lass 8 und einen Auslass 9 aufweisenden Gehäuseteilen 10, 11. Das Gehäuse 3 der Kraftstoffpumpe 2 ist mit dem den Einlass 8 aufweisenden Gehäuseteil 10 der Pumpenstufe 2 und mit einem den Elektromotor 1 abdeckenden Gehäusedeckel 12 verbunden. Der Gehäusedeckel 12 hat einen Auslassstutzen 13 und eine La¬ gerung 14 eines Endes der Welle 5. Das andere Ende der Welle 5 hat eine Lagerung 15 in dem den Einlass 8 aufweisenden Ge¬ häuseteil 10 der Pumpenstufe 2. Die Pumpenstufe 2 ist als allgemein bekannte Seitenkanalpumpe ausgebildet . Bei einem Antrieb des Elektromotors 1 fördert die Pumpenstufe 2 Kraft¬ stoff von dem Einlass 8 durch den Auslass 9 und den Elektro- motor 1 zu dem Auslassstutzen 13. An dem Auslassstutzen 13 lässt sich eine Vorlaufleitung anschließen, über die Kraft¬ stoff aus einem Kraftstoffbehälter zu einer Brennkraftmaschi¬ ne gefördert wird. Zur Vereinfachung der Zeichnung sind der Kraftstoffbehälter, die Brennkraftmaschine und die Vorlauf- leitung nicht dargestellt.1 shows a fuel pump with a romotor by a Elect ¬ 1 driven pump stage 2. The electric motor 1 comprises a housing 3 mounted in a stator 4 and a on a shaft 5 rotatably mounted rotor 6. The impeller stage 2 has an impeller 7 arranged on the shaft 5 in a rotationally fixed manner. The impeller 7 rotates between two housing parts 10, 11 having an inlet 8 and an outlet 9. The housing 3 of the fuel pump 2 is the inlet 8 having housing part 10 of the pump stage 2 and connected to a covering the electric motor 1 housing cover 12. The housing cover 12 has an outlet 13 and a La ¬ delay 14 of one end of the shaft 5. The other end of the shaft 5, a bearing 15 in which the inlet 8 having Ge casing part 10 of the pump stage 2. The pump stage 2 is formed as generally known Side channel pump formed. For a drive of the electric motor 1, the pump stage promotes 2 force ¬ material from the inlet 8 through the outlet 9 and the electric motor 1 to the outlet 13. At the outlet 13 can be connected a flow line, on the Kraft¬ material from a fuel tank is promoted to a Brennkraftmaschi¬ ne. To simplify the drawing, the fuel tank, the internal combustion engine and the supply line are not shown.
Der Elektromotor 1 weist einen auf der Welle 5 befestigten Kommutator 16 auf, gegen den zwei Bürsten 17 vorgespannt sind. Der Kommutator 16 ist scheibenförmig gestaltet und mit seinem äußeren Rand bis über den Stator 4 geführt, in dem die Bürsten 17 verschieblich angeordnet sind. Die Bürsten 17 sind beispielsweise als Kohlestifte ausgebildet und werden von Fe¬ derelementen 18 vorgespannt. Die Federelemente 18 stützen sich an einer im Gehäuse 3 befestigten Stütze 19 ab. Der Kom- mutator 16 ist mit nicht dargestellten Spulen des Rotors 6 elektrisch verbunden. Die Bürsten 17 werden über an dem Ge¬ häusedeckel 12 angeordnete Anschlusskontakte 20 mit elektri¬ schem Strom versorgt. Die Anschlusskontakte 20 sind radial neben dem Kommutator 16 angeordnet und haben daher keinen Einfluss auf die axiale Bauhöhe der Kraftstoffpumpe. Figur 2 zeigt eine Schnittdarstellung durch die Kraftstoff¬ pumpe aus Figur 1 entlang der Linie II - II im Bereich einer der Bürsten 17. Hierbei ist zu erkennen, dass die Bürste 17 in einem Spalt zwischen zwei Magnetschalen 21 des Stators 4 geführt ist. Die Ränder der Magnetschalen 21 bilden damit ei¬ ne Führung 22 der Bürste 17.The electric motor 1 has a commutator 16 mounted on the shaft 5 against which two brushes 17 are biased. The commutator 16 is disc-shaped and guided with its outer edge to over the stator 4, in which the brushes 17 are arranged displaceably. The brushes 17 are formed for example as charcoal pins and are biased by Fe ¬ derelementen 18. The spring elements 18 are supported on a support 19 fixed in the housing 3. The commutator 16 is electrically connected to coils of the rotor 6, not shown. The brushes 17 are transferred to the the housing cover 12 arranged connection contacts 20 with electrical ¬ schem powered. The connection contacts 20 are arranged radially next to the commutator 16 and therefore have no influence on the axial height of the fuel pump. FIG. 2 shows a sectional view through the fuel pump from FIG. 1 along the line II-II in the region of one of the brushes 17. It can be seen here that the brush 17 is guided in a gap between two magnetic shells 21 of the stator 4. The edges of the magnetic shells 21 thus form a guide 22 of the brush 17.
Figur 3 zeigt von der in Figur 2 dargestellten Perspektive aus eine weitere Ausführungsform der Kraftstoffpumpe, bei der der Stator 4 eine Tasche 23 zur Aufnahme und als Führung 24 der Bürste 17 aufweist. Der Boden der Tasche 23 bildet eine Stütze 25 zur Abstützung des Federelementes 18.FIG. 3 shows, from the perspective shown in FIG. 2, a further embodiment of the fuel pump in which the stator 4 has a pocket 23 for receiving and as a guide 24 of the brush 17. The bottom of the pocket 23 forms a support 25 for supporting the spring element 18th
Figur 4 zeigt eine weitere Ausführungsform der Kraftstoffpum- pe, bei der der Kommutator 16 von einem C-förmigen Federele¬ ment 26 umgriffen wird. Ein Ende des Federelementes 26 spannt die Bürste 17 gegen den Kommutator 16 vor, während das andere Ende sich an einer Stütze 27 des in Figur 1 dargestellten Ge¬ häuses 3 abstützt. Zur Vereinfachung der Zeichnung ist das Federelement 26 in die Zeichenebene gedreht dargestellt. Auch bei dieser Ausführungsform hat der Stator 4 eine Ausnehmung 28 als Führung 29 der Bürste 17. FIG. 4 shows a further embodiment of the fuel pump, in which the commutator 16 is encompassed by a C-shaped spring element 26. One end of the spring element 26 biases the brush 17 against the commutator 16, while the other end is supported on a support 27 of the housing 3 shown in FIG. To simplify the drawing, the spring element 26 is shown rotated in the plane of the drawing. Also in this embodiment, the stator 4 has a recess 28 as a guide 29 of the brush 17th

Claims

Patentansprüche claims
1. Kraftstoffpumpe zur Förderung von Kraftstoff aus einem Kraftstoffbehälter eines Kraftfahrzeuges mit einer von einem Elektromotor angetriebenen Pumpenstufe, mit einer drehbar gelagerten, ein Laufrad der Pumpenstufe haltern- den Welle, mit einem drehfest auf der Welle angeordneten Rotor des Elektromotors und einem radial außerhalb des Rotors angeordneten Stator und mit parallel zur Welle gegen einen Kommutator vorgespannten Bürsten zur Kontak- tierung zumindest einer auf dem Rotor angeordneten Spu¬ le, d a d u r c h g e k e n n z e i c h n e t , dass die Bürsten (17) radial neben der Spule des Rotors (6) ange¬ ordnet ist.A fuel pump for delivering fuel from a fuel tank of a motor vehicle having a pump stage driven by an electric motor, a rotatably mounted shaft supporting a rotor of the pump stage, a rotor of the electric motor rotatably mounted on the shaft, and a rotor radially outward of the rotor arranged stator and with parallel to the shaft against a commutator biased brushes for contacting at least one arranged on the rotor Spu¬ le, characterized in that the brush (17) radially adjacent to the coil of the rotor (6) is arranged ¬ .
2. Kraftstoffpumpe nach Anspruch 1, d a d u r c h g e ¬ k e n n z e i c h n e t , dass der Kommutator (16) schei¬ benförmig gestaltet ist und mit seinem äußeren Rand bis über den Stator (4) reicht und dass die Bürsten (17) im Stator (4) angeordnet sind.2. Fuel pump according to claim 1, dadurchge ¬ indicates that the commutator (16) is designed schei ¬ benförmig and with its outer edge extends beyond the stator (4) and that the brushes (17) in the stator (4) are arranged.
3. Kraftstoffpumpe nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , dass die Bürsten (17) in ei¬ ner Tasche (23) des Stators (4) angeordnet sind.3. Fuel pump according to claim 1 or 2, characterized in that the brushes (17) in ei ¬ ner pocket (23) of the stator (4) are arranged.
4. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Bürsten (17) jeweils in einem Spalt zwischen zwei benachbarten Magnetschalen (21) des Stators (4) an- geordnet sind.4. Fuel pump according to at least one of the preceding claims, characterized in that the brushes (17) are each arranged in a gap between two adjacent magnetic shells (21) of the stator (4).
5. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass zur Verbindung der Bürsten (17) mit einem Stromnetz vorgesehene Anschlusskontakte (20) des Elektromotors (1) radial neben dem Kommutator (16) oder dem Stator (4) an¬ geordnet sind.5. Fuel pump according to at least one of the preceding claims, characterized in that for connection of the brushes (17) provided with a power supply connection contacts (20) of the electric motor (1). radially adjoining the commutator (16) or the stator (4).
6. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass Federelemente (18) zur Vorspannung der Bürsten (17) gegen den Kommutator (16) von dem Kommutator (16) aus gesehen hinter den Bürsten (17) angeordnet sind.6. A fuel pump according to at least one of the preceding claims, characterized in that spring elements (18) for biasing the brushes (17) against the commutator (16) from the commutator (16) are arranged behind the brushes (17).
7. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass Magnetschalen (21) des Stators (4) oder zwischen zwei Magnetschalen (21) angeordnete Stützen (19, 25) die Federelemente (18) zur Vorspannung der Bürsten (17) ab- stützen.7. Fuel pump according to at least one of the preceding claims, characterized in that magnetic shells (21) of the stator (4) or between two magnetic shells (21) arranged supports (19, 25) the spring elements (18) for biasing the brush (17) off support.
8. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Federelemente (26) den Kommutator (16) und die Bürsten (17) umgreifen.8. A fuel pump according to at least one of the preceding claims, characterized in that the spring elements (26) engage around the commutator (16) and the brushes (17).
9. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass ein eine Lagerung (14) für die Welle (5) aufweisen- der Gehäusedeckel (12) dem Kommutator (16) unmittelbar gegenübersteht .9. A fuel pump according to at least one of the preceding claims, characterized in that a bearing cover (14) for the shaft (5) having the housing cover (12) directly opposite the commutator (16).
10. Kraftstoffpumpe nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass Führungen (22, 24, 29) für die Bürsten (17) paral¬ lel zu der Welle (5) angeordnet sind. 10. Fuel pump according to at least one of the preceding claims, characterized in that guides (22, 24, 29) for the brushes (17) are arranged parallel to the shaft (5).
EP05794654A 2004-11-17 2005-10-05 Fuel pump Withdrawn EP1813009A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004055441A DE102004055441A1 (en) 2004-11-17 2004-11-17 Fuel pump
PCT/EP2005/055000 WO2006053801A1 (en) 2004-11-17 2005-10-05 Fuel pump

Publications (1)

Publication Number Publication Date
EP1813009A1 true EP1813009A1 (en) 2007-08-01

Family

ID=35406714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05794654A Withdrawn EP1813009A1 (en) 2004-11-17 2005-10-05 Fuel pump

Country Status (6)

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US (1) US20090101116A1 (en)
EP (1) EP1813009A1 (en)
JP (1) JP2008520176A (en)
CN (1) CN101128971A (en)
DE (1) DE102004055441A1 (en)
WO (1) WO2006053801A1 (en)

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CN117498607B (en) * 2023-12-29 2024-03-08 常州市一鑫电气有限公司 Wear-resistant high-load miniature brush motor

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Title
See references of WO2006053801A1 *

Also Published As

Publication number Publication date
US20090101116A1 (en) 2009-04-23
JP2008520176A (en) 2008-06-12
WO2006053801A1 (en) 2006-05-26
DE102004055441A1 (en) 2006-05-24
CN101128971A (en) 2008-02-20

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