EP2047106B1 - Fluid pump - Google Patents

Fluid pump Download PDF

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Publication number
EP2047106B1
EP2047106B1 EP07729602A EP07729602A EP2047106B1 EP 2047106 B1 EP2047106 B1 EP 2047106B1 EP 07729602 A EP07729602 A EP 07729602A EP 07729602 A EP07729602 A EP 07729602A EP 2047106 B1 EP2047106 B1 EP 2047106B1
Authority
EP
European Patent Office
Prior art keywords
shaft
bearing cap
pump
fluid pump
bearing
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.)
Not-in-force
Application number
EP07729602A
Other languages
German (de)
French (fr)
Other versions
EP2047106A1 (en
Inventor
Claudius Muschelknautz
Christoph Heier
Bernd Hein
Jerome Thiery
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2047106A1 publication Critical patent/EP2047106A1/en
Application granted granted Critical
Publication of EP2047106B1 publication Critical patent/EP2047106B1/en
Not-in-force 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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0633—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49236—Fluid pump or compressor making
    • Y10T29/49245—Vane type or other rotary, e.g., fan

Definitions

  • the invention relates to a fluid pump, in particular a liquid pump for a cooling or heating circuit of a motor vehicle.
  • a fluid pump in particular for the cooling / heating circuit of a motor vehicle is known, which discloses all the features of the preamble of claim 1 and a stator in Klauenpolkonstrutation and separated from the stator by a tube, immersed in the cooling water and forming an impeller rotor
  • the rotor the liquid pump the DE 199 34 382 A1 is arranged radially inside the stator.
  • a bearing shaft of the rotor is rotatably connected at its axial ends with a stationary shaft and encloses this substantially over its entire length. The length of the bearing shaft is at least so large that the center of gravity of the rotor is located between the two axial ends of the bearing shaft of the rotor.
  • the shaft is rotatably anchored at a first end in a recess of the bottom of the pump housing. Its second end is received in the hub of a Rippenstems, which is integrally formed with the front housing part of the pump and the ribs extend radially in the intake manifold of the pump.
  • the fluid pump according to the invention which can be used in particular as a liquid pump for a cooling and / or heating circuit of a motor vehicle, has a pump housing with a rotatably fixed shaft arranged in the pump housing for a rotor having an impeller, wherein the shaft is mounted or fixed only on one side is and at her this depository opposite end carries a shaft at least partially embracing end cap, which is also referred to as a bearing cap.
  • the bearing cap of the fluid pump according to the invention is designed as a metallic hollow body.
  • the bearing cap is mounted on the shaft such that the inner rotor of the fluid pump is axially secured on the shaft.
  • the bearing cap thus serves as an axial securing element, which limits the axial displaceability of the rotor on the rotational shaft.
  • This hollow body for example, at its the bearing point of the shaft side facing tabs, in particular integrally formed with the hollow body tabs, which allow an operative connection of the bearing cap with the shaft.
  • the tabs may be formed in particular as metallic leaf springs, so that the bearing cap can be pressed or attached to the shaft by applying a corresponding pressing force under elastic deformation of the bearing cap straps.
  • the mounting of the bearing cap can be done in a groove, in grooves or directly on the shaft itself.
  • the pump according to the invention may be between the impeller and the shaft at least partially encompassing bearing cap an additional disc, such as a lock washer, introduced.
  • the bearing cap applied to the second shaft end has a substantially conical shape.
  • the bearing cap tapers in the direction of the suction opening of the pump.
  • the opening angle of the cone of the bearing cap can be correlated with the opening angle of the suction port of the pump in an advantageous manner. This allows an effective deflection, or a non-turbulent outflow of the fluid flowing through the suction port on the impeller blades of the impeller.
  • the shape of the bearing cap corresponds to a rotary cone or a rotary truncated cone, wherein the suction opening facing the end of the bearing cap is flattened or rounded in order to ensure a substantially laminar flow around the bearing cap.
  • the fluid pump according to the invention with its unilaterally fixed shaft, which has a cap-shaped fixing element for the rotor or the impeller of the pump at its end remote from the attachment, advantageously allows both the safe mounting of the rotor or impeller and an efficient dirt repellent with the conveying fluid entrained dirt. This prevents in particular that dirt particles can be deposited between the rotor and the shaft, which would lead to a significant deterioration of the running properties of the rotor of the fluid pump.
  • FIG. 1 shows a schematic overview of a fluid pump according to the invention in a longitudinal section.
  • fluid pump according to the invention has the embodiment of a cooling water pump, in particular a cooling water pump for an internal combustion engine of a motor vehicle, wherein the pump according to the invention is not limited to this embodiment.
  • the pump 10 has a three-part housing, which consists of a housing front part 12 with an intake 14 formed thereon, a partition 16 and a housing rear part 18.
  • the housing parts 12, 16 and 18 are in the embodiment of FIG. 1 held together by screws 20, but also a bonding or welding of the housing parts is possible.
  • the partition 16, which is essentially cup-shaped, is clamped between the front housing part 12 and the rear housing part 18.
  • a sealing ring 22 is clamped between the front housing part 12 and partition 16.
  • the partition wall 16 is made of a non-magnetic material and has a thin-walled portion in the form of a tube 24, which together with a bottom 26 forms a cup in which a rotor 28 is rotatably arranged.
  • the rotor 28 is made of a plastic-bonded magnetic material, for example, embedded in a resin matrix or plastic matrix, powdered magnetic material, in particular in one piece, for example by injection molding.
  • the rotor has an outer cylinder 30, which follows the course of the tube 24 of the cup-shaped partition 16 at a short distance.
  • the outer cylinder 30 is closed at its end facing the intake 14 by a flange 32.
  • the flange 32 carries a plurality of vanes or vanes, thus forming a vane or impeller 35 of the pump, which in the embodiment of FIG. 1 are formed integrally with the rotor.
  • bearing shaft 34 extends through the interior of the cylinder 30 of the rotor 28.
  • the bearing shaft 34 and thus, the rotor 28 is rotatably mounted on a rotationally fixed shaft 36 and encloses this substantially over its entire length.
  • the shaft 36 is rotatably anchored at a first end in a recess 38 of the bottom 26.
  • the shaft 36 of the embodiment according to FIG. 1 a knurling 40, with which the example metallic shaft is pressed into the recess 38 of the plastic bottom 26.
  • Other, known to those skilled options for fixing the first shaft end in or on the pump housing are also possible.
  • the shaft 36 carries a bearing cap 44, which surrounds the shaft at least partially and is secured thereto.
  • the bearing shaft 34 of the rotor 28 is thus secured between the recess 38, which is a first bearing point of the shaft, and the bearing cap 44.
  • the bearing cap 44 has a substantially conical shape, which tapers in particular in the direction of the suction opening of the suction nozzle 14.
  • the opening angle of the cone of the bearing cap 44 corresponds in an advantageous manner with the opening angle of the suction port of the pump.
  • the thus configured bearing cap 44 thus ensures both the storage of the rotor of the pump and the rejection of dirt, such as the entrained in the coolant of an internal combustion engine dirt in a single component.
  • the conical shape of the bearing cap whose shape is for example between the shape of a rotary cone and a rotary truncated cone, also increases the efficiency of the pump, since turbulence can be avoided by the shape of the bearing cap and in particular by the waiver of the attachment of such a bearing cap by means of housing webs.
  • the bearing cap Since the bearing cap is supported only by the shaft itself, there is no cross-sectional constriction in the pump inlet due to fastening webs, as these are known from the prior art.
  • the rounded, frusto-conical shape of the bearing cap leads to an effective rejection of entrained in the cooling fluid dirt from the bearing.
  • the shape of the bearing cap which substantially continues the inflow profile of the hub of the rotor, allows in conjunction with the formation of the suction port the suppression of fluid turbulence in the region of the delivery wheel of the pump.
  • FIG. 2 shows for clarity a detailed representation of the rotor secured on the shaft of an alternative embodiment of a fluid pump. Functionally identical components are denoted by the same reference numerals as in FIG. 1 characterized.
  • the shaft 36 is fixed on one side in a serving as a bearing recess 38 of the pot bottom 28 of the partition 16.
  • the shaft without special knurling pressed or glued into the recess.
  • Mounted on the shaft is a rotor 28 made of a plastic-bonded magnetic material. Integrally formed with the rotor is an impeller 35 with a plurality of conveying blades, of which in the illustration of FIG. 2 however, only a single bucket is shown.
  • the bearing cap 44 surrounds the end of the bearing 38 opposite end 42 of the shaft 36th
  • FIG. 3 shows in a perspective view of the rotor 28 inserted into the cup-shaped partition wall 16, on which the conveying wheel 35 are integrally formed with the conveying blades.
  • the bearing cap 44 according to the invention, the rotor 28 is secured axially on the rotationally fixed shaft 36.
  • FIG. 4 shows an embodiment of a bearing cap 44 in a not to scale representation.
  • this bearing cap is made of a metallic material, for example a sheet, drawn, bent or otherwise shaped.
  • the bearing cap 44 is formed as a hollow body, wherein the cap in the embodiment of FIG. 4 at its the flow direction 48 opposite end has a plurality of bent tabs 50, the free ends 52 are bent in the direction of the interior 54.
  • the annularly arranged tabs 50 thus define an opening 56 of the bearing cap 44, which is formed on the side facing away from the flow direction 48 of the cap into this opening 56 of the bearing cap 44, the free shaft end 42 can be inserted.
  • this opening 56 is smaller by a small amount than the diameter of the shaft on which the bearing cap is to be placed and fastened.
  • FIG. 5 shows in a detailed view of an applied to a shaft 36 bearing cap 44th
  • the tabs 50 When pressing the shaft 36 into the interior 54 of the bearing cap 44, the tabs 50 can be elastically pushed back in the manner of leaf springs so that they press with a corresponding counterforce on the shaft 36 and thus secure the bearing cap 44 securely on the shaft 36.
  • the shaft 36 has a circumferentially extending groove 58, in which the free ends 52 of the tabs 50 can engage, thus ensuring a particularly reliable backup of the bearing cap 44 on the second shaft end 42.
  • an additional locking washer may also be provided between the bearing cap 44 and the impeller of the rotor.
  • the fluid pump according to the invention can be mounted in a simple manner, since the shaft only with its first end in a plastic housing of the pump, for example in the bottom of the pot 26 of the partition 16, must be fixed.
  • the rotor 28 may then be slid onto the shaft and secured axially over the bearing cap 44 to be mounted on the shaft and carried by the shaft.
  • the fluid pump according to the invention is not limited to the embodiments described in the figures.
  • the fluid pump according to the invention is not based on the described attachment methods of the shaft in the pump housing or the bearing cap limited to the wave. Further fastening methods known to the person skilled in the art are also possible in the fluid pump according to the invention.
  • a metallic bearing cap can for example be made of a stamped and / or drawn sheet metal.
  • the bearing cap according to the invention, carried by the shaft thus forms an abutment of the impeller of the fluid pump according to the invention.
  • fluid pump according to the invention is not limited to the embodiment of the described canned pump.
  • the fluid pump of the embodiment of the FIG. 1 driving electric motor is designed as a so-called canned motor in which the circulating in the conveying fluid rotor is delimited by a thin partition from the radially extending around the rotor, fixed stator.
  • the split tube 24 is in the embodiment of FIG. 1 formed integrally with the partition wall 16 and the bottom 26.
  • On the partition wall 16 and the solenoid 60 of the stator of the electric motor is also attached.
  • the cylindrical coil 60 is contacted via electrical connection means 62 with a printed circuit board 64, on which the power electronics 66 is arranged to drive the pump.
  • a corresponding plug element 68 such a pump, for example to the on-board network of a motor vehicle, can be connected in order to serve as a delivery pump for the cooling medium in a cooling circuit or heating circuit of the motor vehicle.
  • the stator as in the DE 199 34 382 A1 described, be designed as Klauenpolstator. This design makes it possible to realize a high number of pole pairs for driving the rotor 28 with a simple winding in the form of a cylindrical coil 60.
  • a plurality of stators could be mounted axially one behind the other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The invention relates to a fluid pump, in particular a liquid pump for a cooling and/or heating circuit of a motor vehicle, having a pump housing and having a rotationally fixed shaft, which is arranged in the pump housing, for an inner rotor which has an impeller wheel. According to the invention, it is proposed that the shaft is mounted at one side and, at its end remote from the bearing point, supports a bearing cap which engages at least partially around the shaft. The invention also relates to a method for producing a fluid pump of said type, in which method the shaft is fixed with its first end in a housing, in particular in a plastic housing, of the pump, the inner rotor of the pump is pushed onto the shaft and is secured axially by means of a bearing cap which is placed onto the shaft and is supported by the shaft.

Description

Die Erfindung betrifft eine Fluidpumpe, insbesondere eine Flüssigkeitspumpe für einen Kühl- oder Heizkreislauf eines Kraftfahrzeuges.The invention relates to a fluid pump, in particular a liquid pump for a cooling or heating circuit of a motor vehicle.

Stand der TechnikState of the art

Aus der DE 199 34 382 A1 ist eine Flüssigkeitspumpe, insbesondere für den Kühl-/Heizkreislauf eines Kraftfahrzeuges bekannt, welche alle Merkmale des Oberbegriffs des Anspruchs 1 offenbart und einen Stator in Klauenpolkonstruktion und einen von dem Stator durch ein Rohr getrennten, im Kühlwasser eingetauchten und ein Flügelrad bildenden Rotor aufweist Der Rotor der Flüssigkeitspumpe der DE 199 34 382 A1 ist radial innerhalb des Stators angeordnet. Ein Lagerschaft des Rotors ist an seinen axialen Enden drehbar mit einer ortsfesten Welle verbunden und umschließt diese im Wesentlichen auf ihrer gesamten Länge. Die Länge des Lagerschaftes ist dabei wenigstens so groß, dass der Schwerpunkt des Rotors zwischen den beiden axialen Enden des Lagerschaftes des Rotors liegt. Die Welle ist an einem ersten Ende in einer Aussparung des Bodens des Pumpengehäuses drehfest verankert. Ihr zweites Ende ist in der Nabe eines Rippenstems aufgenommen, der mit dem Gehäusevorderteil der Pumpe einstückig ausgebildet ist und dessen Rippen radial im Ansaugstutzen der Pumpe verlaufen.From the DE 199 34 382 A1 a fluid pump, in particular for the cooling / heating circuit of a motor vehicle is known, which discloses all the features of the preamble of claim 1 and a stator in Klauenpolkonstruktion and separated from the stator by a tube, immersed in the cooling water and forming an impeller rotor The rotor the liquid pump the DE 199 34 382 A1 is arranged radially inside the stator. A bearing shaft of the rotor is rotatably connected at its axial ends with a stationary shaft and encloses this substantially over its entire length. The length of the bearing shaft is at least so large that the center of gravity of the rotor is located between the two axial ends of the bearing shaft of the rotor. The shaft is rotatably anchored at a first end in a recess of the bottom of the pump housing. Its second end is received in the hub of a Rippenstems, which is integrally formed with the front housing part of the pump and the ribs extend radially in the intake manifold of the pump.

Offenbarung der ErfindungDisclosure of the invention

Die erfindungsgemäße Fluidpumpe, die insbesondere als Flüssigkeitspumpe für einen Kühl- und/oder Heizkreislauf eines Kraftfahrzeuges Verwendung finden kann, weist ein Pumpengehäuse mit einer im Pumpengehäuse angeordneten, drehfesten Welle für einen ein Flügelrad aufweisenden Rotor auf, wobei die Welle lediglich einseitig gelagert bzw. fixiert ist und an ihrem dieser Lagerstelle entgegen gesetzten Ende eine die Welle zumindest teilweise umgreifende Abschlusskappe trägt, die im weiteren auch als Lagerkappe bezeichnet wird.The fluid pump according to the invention, which can be used in particular as a liquid pump for a cooling and / or heating circuit of a motor vehicle, has a pump housing with a rotatably fixed shaft arranged in the pump housing for a rotor having an impeller, wherein the shaft is mounted or fixed only on one side is and at her this depository opposite end carries a shaft at least partially embracing end cap, which is also referred to as a bearing cap.

Ferner ist aus der WO 2007/023014 A1 eine Fluidpumpe bekannt diese Druckschrift fällt unter Art. 54(3) Eplïmol ist somit für die Frage der erfinderischen tätigkeit nicht von Bedentung. Anspruch 1 unterscheidet sich von dieser Druckschrift dadurch, dass die lagerkappe ein metallischer Holkörper ist.Furthermore, from the WO 2007/023014 A1 a fluid pump known this document falls under Article 54 (3) Eplïmol is therefore not of concern for the question of inventive step. Claim 1 differs from this document in that the stock cap is a metallic Holkörper.

Diese als Sicherungselement dienende Lagerkappe ermöglicht zudem, dass die Lagerung des Rotors und die Abweisung des in der Kühlflüssigkeit mitgeführten Schmutzes, wie beispielsweise Formsand aus dem Motorblock, durch ein einziges Bauteil realisiert werden kann. Dadurch, dass die Lagerkappe lediglich von der drehfesten Welle getragen ist und nicht beispielsweise am Gehäuse der Pumpe angestützt ist, ist zudem eine Erhöhung des Wirkungsgrades der Pumpe möglich, da auf eine Querschnittsverengung am Pumpenzulauf aufgrund einer beispielsweise über Stege realisierten sternförmigen Fixierung eines Gegenlagers am Pumpengehäuse verzichtet werden kann. Somit können die unterschiedlichen Funktionen Lagerung und Schmutzabweisung, insbesondere die Abweisung von mitgeführtem Schmutz von der Lagerstelle, in einem Bauteil realisiert werden, was zu einer Montage- und Kostenersparnis der erfindungsgemäßen Pumpe führt. In vorteilhaften Weise ist die Lagerkappe der erfindungsgemäßen Fluidpumpe als ein metallischer Hohlkörper ausgebildet.Serving as a securing element bearing cap also allows the storage of the rotor and the rejection of the entrained in the coolant dirt, such as molding sand from the engine block, can be realized by a single component. The fact that the bearing cap is supported only by the rotationally fixed shaft and is not supported for example on the housing of the pump, an increase in the efficiency of the pump is also possible because of a cross-sectional constriction at the pump inlet due to a realized example of webs star-shaped fixation of an abutment on the pump housing can be waived. Thus, the different functions storage and dirt repellency, in particular the rejection of entrained dirt from the bearing, can be realized in one component, which leads to an assembly and cost savings of the pump according to the invention. Advantageously, the bearing cap of the fluid pump according to the invention is designed as a metallic hollow body.

Durch die in den abhängigen Ansprüchen aufgeführten Merkmale sind vorteilhafte Weiterbildungen der erfindungsgemäßen Fluidpumpe möglich.The features listed in the dependent claims advantageous developments of the fluid pump according to the invention are possible.

In vorteilhafter Weise ist die Lagerkappe derart auf der Welle montiert, dass der Innenrotor der Fluidpumpe axial auf der Welle gesichert ist Die Lagerkappe dient somit als axiales Sicherungselement, welches die axiale Verschiebbarkeit des Rotors auf der drehfesten Welle begrenzt.Advantageously, the bearing cap is mounted on the shaft such that the inner rotor of the fluid pump is axially secured on the shaft. The bearing cap thus serves as an axial securing element, which limits the axial displaceability of the rotor on the rotational shaft.

Dieser Hohlkörper kann beispielsweise an seiner der Lagerstelle der Welle zugewandten Seite Laschen, insbesondere einstückig mit dem Hohlkörper ausgebildete Laschen, aufweisen, die eine Wirkverbindung der Lagerkappe mit der Welle ermöglichen. Dazu kann beispielsweise zumindest eine Lasche der Lagerkappe in eine in die Welle eingebrachte Nut eingreifen und die Kappe auf der Welle axial fixieren.This hollow body, for example, at its the bearing point of the shaft side facing tabs, in particular integrally formed with the hollow body tabs, which allow an operative connection of the bearing cap with the shaft. For this purpose, for example, engage at least one tab of the bearing cap in a groove introduced into the shaft and axially fix the cap on the shaft.

In alternativen Ausführungsformen können die Laschen insbesondere als metallische Blattfedern ausgebildet sein, so dass die Lagerkappe unter Aufbringung einer entsprechenden Aufpresskraft unter elastischer Verformung der Lagerkappenlaschen auf die Welle aufgepresst bzw. aufgesteckt werden kann.In alternative embodiments, the tabs may be formed in particular as metallic leaf springs, so that the bearing cap can be pressed or attached to the shaft by applying a corresponding pressing force under elastic deformation of the bearing cap straps.

Die Montage der Lagerkappe kann in einer Nut, in Rillen oder auch direkt auf der Welle selbst erfolgen.The mounting of the bearing cap can be done in a groove, in grooves or directly on the shaft itself.

In alternativen Ausführungsformen der erfindungsgemäßen Pumpe kann zwischen dem Flügelrad und der die Welle zumindest teilweise umgreifenden Lagerkappe eine zusätzliche Scheibe, beispielsweise eine Sicherungsscheibe, eingebracht sein.In alternative embodiments of the pump according to the invention may be between the impeller and the shaft at least partially encompassing bearing cap an additional disc, such as a lock washer, introduced.

In vorteilhafter Weise besitzt die auf das zweite Wellenende aufgebrachte Lagerkappe eine im Wesentlichen konische Form. Insbesondere verjüngt sich die Lagerkappe in Richtung auf die Ansaugöffnung der Pumpe hin. Dabei kann in vorteilhafter Weise der Öffnungswinkel des Konus der Lagerkappe mit dem Öffnungswinkel der Ansaugöffnung der Pumpe korreliert sein. Dies ermöglicht eine effektive Umlenkung, bzw. ein nicht turbulentes Abströmen des durch die Ansaugöffnung einströmenden Fluids auf die Förderschaufeln des Pumpenrades.Advantageously, the bearing cap applied to the second shaft end has a substantially conical shape. In particular, the bearing cap tapers in the direction of the suction opening of the pump. In this case, the opening angle of the cone of the bearing cap can be correlated with the opening angle of the suction port of the pump in an advantageous manner. This allows an effective deflection, or a non-turbulent outflow of the fluid flowing through the suction port on the impeller blades of the impeller.

In vorteilhafter Weise entspricht die Form der Lagerkappe dabei einem Drehkegel bzw. einem Drehkegelstumpf, wobei das der Ansaugöffnung zugewandte Ende der Lagerkappe abgeflacht bzw. abgerundet ist, um möglichst eine im Wesentlichen laminare Umströmung der Lagerkappe zu gewährleisten.In an advantageous manner, the shape of the bearing cap corresponds to a rotary cone or a rotary truncated cone, wherein the suction opening facing the end of the bearing cap is flattened or rounded in order to ensure a substantially laminar flow around the bearing cap.

Die erfindungsgemäße Fluidpumpe mit ihrer einseitig fixierten Welle, welche an ihrem der Befestigung abgewandten Ende ein kappenförmiges Fixierelement für den Rotor bzw. das Flügelrad der Pumpe aufweist, ermöglicht in vorteilhafter Weise sowohl die sichere Lagerung des Rotors bzw. Flügelrades als auch eine effiziente Schmutzabweisung des mit dem Förderfluid mitgeführten Schmutzes. Dies verhindert insbesondere, dass sich Schmutzpartikel zwischen dem Rotor und der Welle ablagern können, was zu einer deutlichen Verschlechterung der Laufeigenschaften des Rotors der Fluidpumpe führen würde.The fluid pump according to the invention with its unilaterally fixed shaft, which has a cap-shaped fixing element for the rotor or the impeller of the pump at its end remote from the attachment, advantageously allows both the safe mounting of the rotor or impeller and an efficient dirt repellent with the conveying fluid entrained dirt. This prevents in particular that dirt particles can be deposited between the rotor and the shaft, which would lead to a significant deterioration of the running properties of the rotor of the fluid pump.

Weitere Vorteile der erfindungsgemäßen Fluidpumpe ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels.Further advantages of the fluid pump according to the invention will become apparent from the following description of an embodiment.

Zeichnungdrawing

In der Zeichnung ist ein Ausführungsbeispiel für die erfindungsgemäße Fluidpumpe dargestellt, welches in der nachfolgenden Beschreibung näher erläutert werden soll. Figuren der Zeichnung, deren Beschreibung sowie die Ansprüche enthalten zahlreiche Merkmale in Kombinationen. Ein Fachmann wird diese Merkmale auch einzeln betrachten und zu weiteren sinnvollen Kombinationen zusammenfassen. Insbesondere wird ein Fachmann auch Merkmale aus unterschiedlichen Ausführungsformen zu weiteren sinnvollen Kombinationen zusammenfassen.In the drawing, an embodiment of the fluid pump according to the invention is shown, which in the following description closer should be explained. Figures of the drawing, the description and the claims contain numerous features in combinations. A person skilled in the art will also consider these features individually and combine them into further meaningful combinations. In particular, a person skilled in the art will also combine features from different embodiments into further meaningful combinations.

Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel einer erfindungsgemäßen Fluidpumpe in einer vereinfachten Längsschnittdarstellung,
Figur 2
eine Detaildarstellung einer alternativen Ausführungsform einer erfindungsgemäßen Fluidpumpe im Bereich des Rotors der Pumpe,
Figur 3
eine perspektivische Aufsicht auf das Flügelrad der Fluidpumpe mit aufgesetzter Lagerkappe,
Figur 4
ein Ausführungsbeispiel einer Lagerkappe,
Figur 5
eine auf das freie Wellenende aufgesetzte und an diesem fixierte Lagerkappe.
Show it:
FIG. 1
A first embodiment of a fluid pump according to the invention in a simplified longitudinal sectional view,
FIG. 2
a detailed view of an alternative embodiment of a fluid pump according to the invention in the region of the rotor of the pump,
FIG. 3
a perspective view of the impeller of the fluid pump with attached bearing cap,
FIG. 4
an embodiment of a bearing cap,
FIG. 5
a mounted on the free end of the shaft and fixed to this bearing cap.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Figur 1 zeigt in einer schematischen Übersichtsdarstellung eine erfindungsgemäße Fluidpumpe in einem Längsschnitt. FIG. 1 shows a schematic overview of a fluid pump according to the invention in a longitudinal section.

Die in Figur 1 gezeigte, erfindungsgemäße Fluidpumpe besitzt die Ausführungsform einer Kühlwasserpumpe, insbesondere einer Kühlasserpumpe für einen Verbrennungsmotor eines Kraftfahrzeuges, wobei die erfindungsgemäße Pumpe nicht auf diese Ausführungsform beschränkt ist. Die Pumpe 10 hat ein dreiteiliges Gehäuse, das aus einem Gehäusevorderteil 12 mit einem daran ausgebildeten Saugstutzen 14, einer Trennwand 16 sowie einem Gehäusehinterteil 18 besteht.In the FIG. 1 shown fluid pump according to the invention has the embodiment of a cooling water pump, in particular a cooling water pump for an internal combustion engine of a motor vehicle, wherein the pump according to the invention is not limited to this embodiment. The pump 10 has a three-part housing, which consists of a housing front part 12 with an intake 14 formed thereon, a partition 16 and a housing rear part 18.

Die Gehäuseteile 12, 16 und 18 sind im Ausführungsbeispiel der Figur 1 durch Schrauben 20 zusammengehalten, wobei jedoch auch ein Verkleben oder Verschweißen der Gehäuseteile möglich ist. Die Trennwand 16, die im Wesentlichen becherförmig ausgebildet ist, ist dabei zwischen dem Gehäusevorderteil 12 und dem Gehäusehinterteil 18 eingespannt. Ein Dichtring 22 ist zwischen Gehäusevorderteil 12 und Trennwand 16 eingeklemmt. Die Trennwand 16 besteht aus einem nichtmagnetischen Material und besitzt einen dünnwandigen Abschnitt in Form eines Rohres 24, der zusammen mit einem Boden 26 einen Becher bildet, in dem ein Rotor 28 drehbar angeordnet ist.The housing parts 12, 16 and 18 are in the embodiment of FIG. 1 held together by screws 20, but also a bonding or welding of the housing parts is possible. The partition 16, which is essentially cup-shaped, is clamped between the front housing part 12 and the rear housing part 18. A sealing ring 22 is clamped between the front housing part 12 and partition 16. The partition wall 16 is made of a non-magnetic material and has a thin-walled portion in the form of a tube 24, which together with a bottom 26 forms a cup in which a rotor 28 is rotatably arranged.

Der Rotor 28 ist aus einem kunststoffgebundenen Magnetmaterial, zum Beispiel aus in eine Kunstharzmatrix oder Kunststoffmatrix eingebettetes, pulverförmiges Magnetmaterial, insbesondere einstückig, zum Beispiel durch Spritzguss, gefertigt. Der Rotor weist einen äußeren Zylinder 30 auf, der mit geringem Abstand dem Verlauf des Rohres 24 der becherförmigen Trennwand 16 folgt. Der äußere Zylinder 30 ist an seinem dem Ansaugstutzen 14 zugewandten Ende durch einen Flansch 32 verschlossen. Der Flansch 32 trägt eine Mehrzahl von Flügeln bzw. Schaufeln du bildet somit ein Flügel- oder Förderrad 35 der Pumpe, das im Ausführungsbeispiel der Figur 1 einstückig mit dem Rotor ausgebildet sind.The rotor 28 is made of a plastic-bonded magnetic material, for example, embedded in a resin matrix or plastic matrix, powdered magnetic material, in particular in one piece, for example by injection molding. The rotor has an outer cylinder 30, which follows the course of the tube 24 of the cup-shaped partition 16 at a short distance. The outer cylinder 30 is closed at its end facing the intake 14 by a flange 32. The flange 32 carries a plurality of vanes or vanes, thus forming a vane or impeller 35 of the pump, which in the embodiment of FIG. 1 are formed integrally with the rotor.

Ein mit dem Rotorflansch 32 einstückig verbundener Lagerschaft 34 erstreckt sich durch das Innere des Zylinders 30 des Rotors 28. Der Lagerschaft 34 und somit der Rotor 28 ist drehbar auf einer drehfesten Welle 36 angeordnet und umschließt diese im Wesentlichen auf ihrer gesamten Länge.An integrally connected to the rotor flange 32 bearing shaft 34 extends through the interior of the cylinder 30 of the rotor 28. The bearing shaft 34 and Thus, the rotor 28 is rotatably mounted on a rotationally fixed shaft 36 and encloses this substantially over its entire length.

Die Welle 36 ist an einem ersten Ende in einer Aussparung 38 des Bodens 26 drehfest verankert. Dazu besitzt die Welle 36 des Ausführungsbeispiels gemäß Figur 1 eine Rändelung 40, mit der die beispielsweise metallische Welle in die Aussparung 38 des Kunststoffbodens 26 eingepresst ist. Andere, dem Fachmann bekannte Möglichkeiten zur Fixierung des ersten Wellenendes im oder am Pumpengehäuse sind ebenso möglich.The shaft 36 is rotatably anchored at a first end in a recess 38 of the bottom 26. For this purpose, the shaft 36 of the embodiment according to FIG. 1 a knurling 40, with which the example metallic shaft is pressed into the recess 38 of the plastic bottom 26. Other, known to those skilled options for fixing the first shaft end in or on the pump housing are also possible.

An ihrem zweiten, der Lagerstelle 38 entgegen gesetzten Ende 42 trägt die Welle 36 eine Lagerkappe 44, die die Welle zumindest teilweise umgreift und auf dieser befestigt ist. Der Lagerschaft 34 des Rotors 28 ist somit zwischen der Aussparung 38, die eine erste Lagerstelle der Welle darstellt, und der Lagerkappe 44 gesichert.At its second, the bearing 38 opposite end 42, the shaft 36 carries a bearing cap 44, which surrounds the shaft at least partially and is secured thereto. The bearing shaft 34 of the rotor 28 is thus secured between the recess 38, which is a first bearing point of the shaft, and the bearing cap 44.

Die Lagerkappe 44 weist eine im Wesentlichen konische Form auf, die sich insbesondere in Richtung auf die Ansaugöffnung des Saugstutzens 14 hin verjüngt.The bearing cap 44 has a substantially conical shape, which tapers in particular in the direction of the suction opening of the suction nozzle 14.

Der Öffnungswinkel des Konus der Lagerkappe 44 korrespondiert dabei in vorteilhafter Weise mit dem Öffnungswinkel der Ansaugöffnung der Pumpe. Die derart ausgestaltete Lagerkappe 44 gewährleistet somit sowohl die Lagerung des Rotors der Pumpe als auch die Abweisung von Schmutz, beispielsweise des in der Kühlflüssigkeit eines Verbrennungsmotors mitgeführten Schmutzes, in einem einzelnen Bauteil. Die konische Ausformung der Lagerkappe, deren Form beispielsweise zwischen der Form eines Drehkegels und eines Drehkegelstumpfes liegt, erhöht zudem den Wirkungsgrad der Pumpe, da Turbulenzen durch die Form der Lagerkappe und insbesondere durch den Verzicht der Befestigung einer solchen Lagerkappe mittels Gehäusestegen vermieden werden kann. Da die Lagerkappe lediglich von der Welle selbst getragen ist, kommt es zu keinerlei Querschnittsverengung im Pumpenzulauf aufgrund von Befestigungsstegen, wie diese aus dem Stand der Technik bekannt sind. Darüber hinaus führt die abgerundete, kegelstumpfartige Ausformung der Lagerkappe zu einer effektiven Abweisung des im Kühlfluid mitgeführten Schmutzes von der Lagerstelle weg. Die Form der Lagerkappe, die im Wesentlichen das Anströmprofil der Nabe des Rotors fortsetzt, ermöglicht im Zusammenspiel mit der Ausformung der Ansaugöffnung die Unterdrückung von Fluidturbulenzen im Bereich des Förderrades der Pumpe.The opening angle of the cone of the bearing cap 44 corresponds in an advantageous manner with the opening angle of the suction port of the pump. The thus configured bearing cap 44 thus ensures both the storage of the rotor of the pump and the rejection of dirt, such as the entrained in the coolant of an internal combustion engine dirt in a single component. The conical shape of the bearing cap, whose shape is for example between the shape of a rotary cone and a rotary truncated cone, also increases the efficiency of the pump, since turbulence can be avoided by the shape of the bearing cap and in particular by the waiver of the attachment of such a bearing cap by means of housing webs. Since the bearing cap is supported only by the shaft itself, there is no cross-sectional constriction in the pump inlet due to fastening webs, as these are known from the prior art. In addition, the rounded, frusto-conical shape of the bearing cap leads to an effective rejection of entrained in the cooling fluid dirt from the bearing. The shape of the bearing cap, which substantially continues the inflow profile of the hub of the rotor, allows in conjunction with the formation of the suction port the suppression of fluid turbulence in the region of the delivery wheel of the pump.

Figur 2 zeigt zur Verdeutlichung eine Detaildarstellung des auf der Welle gesicherten Rotors einer alternativen Ausführungsform einer Fluidpumpe. Funktionsgleiche Bauteile sind dabei mit denselben Bezugszeichen wie in der Figur 1 gekennzeichnet. Die Welle 36 ist einseitig in einer als Lagerstelle dienenden Aussparung 38 des Topfbodens 28 der Trennwand 16 fixiert. Im Ausführungsbeispiel der Figur 2 ist die Welle ohne spezielle Rändelung lediglich in die Aussparung eingepresst bzw. eingeklebt. Auf die Welle aufgesetzt ist ein Rotor 28 aus einem kunststoffgebundenen Magnetmaterial Einstückig mit dem Rotor ausgebildet ist ein Flügelrad 35 mit einer Mehrzahl von Förderschaufeln, von denen in der Darstellung der Figur 2 jedoch nur eine einzelne Förderschaufel dargestellt ist. Der auf die Welle 36 aufgesetzte Rotor 28, der gleichzeitig als Förderrad 35 für das zu fördernde Fluid dient, ist über eine auf die Welle 36 aufgepresste Lagerkappe 44 axial gesichert. Dabei umgreift die Lagerkappe 44 das der Lagerstelle 38 entgegen gesetzte Ende 42 der Welle 36. FIG. 2 shows for clarity a detailed representation of the rotor secured on the shaft of an alternative embodiment of a fluid pump. Functionally identical components are denoted by the same reference numerals as in FIG. 1 characterized. The shaft 36 is fixed on one side in a serving as a bearing recess 38 of the pot bottom 28 of the partition 16. In the embodiment of FIG. 2 is the shaft without special knurling pressed or glued into the recess. Mounted on the shaft is a rotor 28 made of a plastic-bonded magnetic material. Integrally formed with the rotor is an impeller 35 with a plurality of conveying blades, of which in the illustration of FIG FIG. 2 however, only a single bucket is shown. The attached to the shaft 36 rotor 28, which also serves as a feed wheel 35 for the fluid to be pumped, is axially secured by a pressed onto the shaft 36 bearing cap 44. In this case, the bearing cap 44 surrounds the end of the bearing 38 opposite end 42 of the shaft 36th

Figur 3 zeigt in einer perspektivischen Darstellung den in die becherförmige Trennwand 16 eingesetzten Rotor 28, an dem das Förderrad 35 mit den Förderschaufeln einstückig ausgeformt sind. Durch die erfindungsgemäße Lagerkappe 44 ist der Rotor 28 axial auf der drehfesten Welle 36 gesichert. FIG. 3 shows in a perspective view of the rotor 28 inserted into the cup-shaped partition wall 16, on which the conveying wheel 35 are integrally formed with the conveying blades. By the bearing cap 44 according to the invention, the rotor 28 is secured axially on the rotationally fixed shaft 36.

Figur 4 zeigt in einer nicht maßstäblichen Darstellung ein Ausführungsbeispiel für eine Lagerkappe 44 Erfindungsgemäß ist diese Lagerkappe aus einem metallischen Werkstoff, beispielsweise einem Blech, gezogen, gebogen oder andersartig ausgeformt. Die Lagerkappe 44 ist als ein Hohlkörper ausgebildet, wobei die Kappe im Ausführungsbeispiel der Figur 4 an ihrem der Anströmungsrichtung 48 entgegen gesetzten Ende eine Mehrzahl von gebogenen Laschen 50 aufweist, deren freie Enden 52 in Richtung des Innenraumes 54 umgebogen sind. Die kranzförmig angeordneten Laschen 50 definieren somit eine Öffnung 56 der Lagerkappe 44, die auf der der Anströmungsrichtung 48 abgekehrten Seite der Kappe ausgebildet ist In diese Öffnung 56 der Lagerkappe 44 kann das freie Wellenende 42 eingeführt werden. FIG. 4 shows an embodiment of a bearing cap 44 in a not to scale representation. According to the invention, this bearing cap is made of a metallic material, for example a sheet, drawn, bent or otherwise shaped. The bearing cap 44 is formed as a hollow body, wherein the cap in the embodiment of FIG. 4 at its the flow direction 48 opposite end has a plurality of bent tabs 50, the free ends 52 are bent in the direction of the interior 54. The annularly arranged tabs 50 thus define an opening 56 of the bearing cap 44, which is formed on the side facing away from the flow direction 48 of the cap into this opening 56 of the bearing cap 44, the free shaft end 42 can be inserted.

In vorteilhafter Weise ist der Durchmesser dieser Öffnung 56 um ein geringes Maß kleiner als der Durchmesser der Welle, auf der die Lagerkappe aufgesetzt und befestigt werden soll.Advantageously, the diameter of this opening 56 is smaller by a small amount than the diameter of the shaft on which the bearing cap is to be placed and fastened.

Figur 5 zeigt in einer Detaildarstellung eine auf eine Welle 36 aufgebrachte Lagerkappe 44. FIG. 5 shows in a detailed view of an applied to a shaft 36 bearing cap 44th

Bei dem Einpressen der Welle 36 in den Innenraum 54 der Lagerkappe 44 können die Laschen 50 in der Art von Blattfedern elastisch zurückgedrückt werden, so dass diese mit einer entsprechenden Gegenkraft auf die Welle 36 drücken und somit die Lagerkappe 44 sicher auf der Welle 36 befestigen.When pressing the shaft 36 into the interior 54 of the bearing cap 44, the tabs 50 can be elastically pushed back in the manner of leaf springs so that they press with a corresponding counterforce on the shaft 36 and thus secure the bearing cap 44 securely on the shaft 36.

Im Ausführungsbeispiel der Figur 5 besitzt die Welle 36 eine in Umfangsrichtung verlaufende Nut 58, in die die freien Enden 52 der Laschen 50 eingreifen können, um somit eine besonders zuverlässige Sicherung der Lagerkappe 44 auf dem zweiten Wellenende 42 zu gewährleisten.In the embodiment of FIG. 5 the shaft 36 has a circumferentially extending groove 58, in which the free ends 52 of the tabs 50 can engage, thus ensuring a particularly reliable backup of the bearing cap 44 on the second shaft end 42.

In alternativen Ausführungsformen kann zwischen der Lagerkappe 44 und dem Flügelrad des Rotors auch noch eine zusätzliche Sicherungsscheibe vorgesehen sein.In alternative embodiments, an additional locking washer may also be provided between the bearing cap 44 and the impeller of the rotor.

Die erfindungsgemäße Fluidpumpe lässt sich in einfacher Weise montieren, da die Welle lediglich mit ihrem ersten Ende in einem Kunststoffgehäuse der Pumpe, beispielsweise in dem Topfboden 26 der Trennwand 16, fixiert werden muss. Der Rotor 28 kann sodann auf die Welle aufgeschoben werden und über die auf die Welle aufzusetzende und von der Welle getragene Lagerkappe 44 axial gesichert werden.The fluid pump according to the invention can be mounted in a simple manner, since the shaft only with its first end in a plastic housing of the pump, for example in the bottom of the pot 26 of the partition 16, must be fixed. The rotor 28 may then be slid onto the shaft and secured axially over the bearing cap 44 to be mounted on the shaft and carried by the shaft.

Die erfindungsgemäße Fluidpumpe ist nicht auf die in den Figuren beschriebenen Ausführungsformen beschränkt.The fluid pump according to the invention is not limited to the embodiments described in the figures.

Darüber hinaus ist die erfindungsgemäße Fluidpumpe nicht auf die beschriebenen Befestigungsmethoden der Welle im Pumpengehäuse bzw. der Lagerkappe auf der Welle beschränkt. Weitere, dem Fachmann bekannte Befestigungsmethoden sind in der erfindungsgemäßen Fluidpumpe ebenso möglich.In addition, the fluid pump according to the invention is not based on the described attachment methods of the shaft in the pump housing or the bearing cap limited to the wave. Further fastening methods known to the person skilled in the art are also possible in the fluid pump according to the invention.

Eine metallische Lagerkappe kann beispielsweise aus einem gestanzten und/oder gezogenen Blech hergestellt sein.A metallic bearing cap can for example be made of a stamped and / or drawn sheet metal.

Die erfindungsgemäße, von der Welle getragene Lagerkappe bildet somit ein Gegenlager des Flügelrades der erfindungsgemäßen Fluidpumpe.The bearing cap according to the invention, carried by the shaft thus forms an abutment of the impeller of the fluid pump according to the invention.

Darüber hinaus ist die erfindungsgemäße Fluidpumpe nicht beschränkt auf die Ausführungsform der beschriebenen Spaltrohrpumpe.In addition, the fluid pump according to the invention is not limited to the embodiment of the described canned pump.

Der die Fluidpumpe des Ausführungsbeispiels der Figur 1 antreibende Elektromotor ist als ein so genannter Spaltrohrmotor ausgebildet, bei dem der in dem Förderfluid umlaufende Rotor durch eine dünne Trennwand vom radial um den Rotor verlaufenden, ortsfesten Stator abgegrenzt ist. Das Spaltrohr 24 ist im Ausführungsbeispiel der Figur 1 einstückig mit der Trennwand 16 und dem Boden 26 ausgeformt. An der Trennwand 16 ist zudem auch die Zylinderspule 60 des Stators des Elektromotors befestigt. Die Zylinderspule 60 ist über elektrische Verbindungsmittel 62 mit einer Leiterplatte 64 kontaktiert, auf der die Leistungselektronik 66 zum Antrieb der Pumpe angeordnet ist. Über ein entsprechendes Steckerelement 68 kann eine derartige Pumpe, beispielsweise an das Bordnetz eines Kraftfahrzeuges, angeschlossen werden, um in einem Kühlkreislauf bzw. Heizkreislauf des Kraftfahrzeuges als Förderpumpe für das Kühlmedium zu dienen. In vorteilhafter Weise kann der Stator, wie in der DE 199 34 382 A1 beschrieben, als Klauenpolstator ausgebildet sein. Diese Bauform erlaubt es, mit einer einfachen Wicklung in Form einer Zylinderspule 60 eine hohe Polpaarzahl zum Antrieb des Rotors 28 zu realisieren.The fluid pump of the embodiment of the FIG. 1 driving electric motor is designed as a so-called canned motor in which the circulating in the conveying fluid rotor is delimited by a thin partition from the radially extending around the rotor, fixed stator. The split tube 24 is in the embodiment of FIG. 1 formed integrally with the partition wall 16 and the bottom 26. On the partition wall 16 and the solenoid 60 of the stator of the electric motor is also attached. The cylindrical coil 60 is contacted via electrical connection means 62 with a printed circuit board 64, on which the power electronics 66 is arranged to drive the pump. By way of a corresponding plug element 68, such a pump, for example to the on-board network of a motor vehicle, can be connected in order to serve as a delivery pump for the cooling medium in a cooling circuit or heating circuit of the motor vehicle. Advantageously, the stator, as in the DE 199 34 382 A1 described, be designed as Klauenpolstator. This design makes it possible to realize a high number of pole pairs for driving the rotor 28 with a simple winding in the form of a cylindrical coil 60.

Um die Antriebsleistung der Pumpe zu steigern, könnten auch eine Mehrzahl von Statoren axial hintereinander montiert werden.To increase the drive power of the pump, a plurality of stators could be mounted axially one behind the other.

Claims (7)

  1. Fluid pump (10), in particular a liquid pump for a cooling and/or heating circuit of a motor vehicle, having a pump housing (12, 14, 16, 18) and a rotationally fixed shaft (36) which is arranged in the pump housing (12, 14, 16, 18) and is for an inner rotor (28) which has an impeller wheel (35), characterized in that the shaft (28) is mounted on one side and, at its opposite end (42) to the bearing point (38), carries a bearing cap (44) which serves as a closure cap and reaches around the shaft (28) at least partially, the bearing cap (44) being a metallic hollow body.
  2. Fluid pump according to Claim 1, characterized in that the bearing cap (44) is mounted on the shaft (28) in such a way that the inner rotor (28) is secured axially on the shaft (28).
  3. Fluid pump according to one of the preceding claims, characterized in that, on its side which faces the bearing point of the shaft, the bearing cap (44) has tongues (50) which surround an opening (56) of the bearing cap.
  4. Fluid pump according to Claim 3, characterized in that at least one tongue (50) of the bearing cap (44) engages into a groove (58) of the shaft (28).
  5. Fluid pump according to Claim 1 or 2, characterized in that the bearing cap (44) has a substantially conical shape.
  6. Fluid pump according to one of the preceding claims, characterized in that the bearing cap (44) tapers in the direction of an intake opening (14) of the pump.
  7. Fluid pump according to Claim 6 and/or 7, characterized in that the opening angle of the cone of the bearing cap (44) is correlated with the opening angle of the intake opening of the pump.
EP07729602A 2006-07-25 2007-05-29 Fluid pump Not-in-force EP2047106B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006034385A DE102006034385A1 (en) 2006-07-25 2006-07-25 Fluid pump and method for producing a fluid pump
PCT/EP2007/055180 WO2008012130A1 (en) 2006-07-25 2007-05-29 Fluid pump and method for producing a fluid pump

Publications (2)

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EP2047106A1 EP2047106A1 (en) 2009-04-15
EP2047106B1 true EP2047106B1 (en) 2012-01-25

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US (1) US8277181B2 (en)
EP (1) EP2047106B1 (en)
CN (1) CN101495758B (en)
AT (1) ATE543005T1 (en)
DE (1) DE102006034385A1 (en)
ES (1) ES2378092T3 (en)
RU (1) RU2467206C2 (en)
WO (1) WO2008012130A1 (en)

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CN101495758B (en) 2012-06-13
WO2008012130A1 (en) 2008-01-31
CN101495758A (en) 2009-07-29
US8277181B2 (en) 2012-10-02
ES2378092T3 (en) 2012-04-04
EP2047106A1 (en) 2009-04-15
WO2008012130A9 (en) 2009-03-19
RU2467206C2 (en) 2012-11-20
RU2009106168A (en) 2010-08-27
DE102006034385A1 (en) 2008-01-31
ATE543005T1 (en) 2012-02-15
US20090252607A1 (en) 2009-10-08

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