EP3198145B1 - Pump unit - Google Patents

Pump unit Download PDF

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Publication number
EP3198145B1
EP3198145B1 EP15744157.7A EP15744157A EP3198145B1 EP 3198145 B1 EP3198145 B1 EP 3198145B1 EP 15744157 A EP15744157 A EP 15744157A EP 3198145 B1 EP3198145 B1 EP 3198145B1
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EP
European Patent Office
Prior art keywords
bearing
drive shaft
section
housing
rotor
Prior art date
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Application number
EP15744157.7A
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German (de)
French (fr)
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EP3198145A1 (en
Inventor
Martin Kling
Evgenij Skrynski
Sando Kunath
Marian Kacmar
Oliver Laforsch
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP3198145A1 publication Critical patent/EP3198145A1/en
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Publication of EP3198145B1 publication Critical patent/EP3198145B1/en
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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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C3/00—Rotary-piston machines or engines with non-parallel axes of movement of co-operating members
    • F01C3/06—Rotary-piston machines or engines with non-parallel axes of movement of co-operating members the axes being arranged otherwise than at an angle of 90 degrees
    • F01C3/08—Rotary-piston machines or engines with non-parallel axes of movement of co-operating members the axes being arranged otherwise than at an angle of 90 degrees of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • 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
    • F04C3/00—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type
    • F04C3/06—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees
    • F04C3/08—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C3/085—Rotary-piston machines or pumps, with non-parallel axes of movement of co-operating members, e.g. of screw type the axes being arranged otherwise than at an angle of 90 degrees of intermeshing engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing the axes of cooperating members being on the same plane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/56—Bearing bushings or details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/60—Shafts

Definitions

  • the invention relates to a delivery unit according to the preamble of the main claim. It is already a delivery unit from the DE 10 2010 040 758 A1 known, with a drive shaft and driven by the drive shaft, rotatably mounted rotor, wherein the drive shaft on one end side has an inclined sliding surface, which can tumble the rotor with its rotor axis about a drive axis of the drive shaft, wherein the drive shaft facing the rotor first bearing portion and a second bearing portion facing away from the rotor.
  • the first bearing portion of the drive shaft is arranged in a first sliding bearing and the second bearing portion in a second sliding bearing.
  • the delivery unit according to the invention with the characterizing features of the main claim has the advantage that the carrying capacity of the rotor facing the first slide bearing is increased compared to the carrying capacity of the second slide bearing by the diameter of the first bearing portion of the drive shaft and the first slide bearing is made larger than the Diameter of the second bearing section and the second sliding bearing.
  • the delivery unit seen by the inventive design in the axial direction of the drive shaft to be built shorter.
  • At least one step-shaped shoulder is formed between the first bearing section and the second bearing section.
  • the drive shaft is thereby particularly easily demoulded from an injection mold of an injection molding machine.
  • an armature portion is provided on the drive shaft between the two bearing portions, which has permanent magnets on its circumference, which cooperate with an electrical winding of an electric stator of an electric motor which surrounds the armature portion of the drive shaft in an annular manner.
  • the anchor portion has a diameter which is in the range between the diameter of the first bearing portion and the diameter of the second bearing portion. In this way, two stepped heels are formed between the two bearing sections.
  • the diameter of the anchor portion for each new design in the range between the diameters of the first and the second bearing portion can be optimally selected.
  • the efficiency of the electric motor can be optimized in a simple manner.
  • the first sliding bearing and the second sliding bearing are each arranged on an end face of the stator because the two sliding bearings integrated in this way in a peripheral wall of the housing of the delivery unit and thereby can be produced inexpensively.
  • stator is integrated with its electrical winding in the material of the peripheral wall of the housing of the delivery unit, since the stator and its electrical winding are sealed in this way against the fluid.
  • the seal is made by the stator is encapsulated on its front sides and also on its inner and outer peripheral side of plastic.
  • the stator is arranged in the circumferential wall of the housing in the axial direction between the first sliding bearing and the second sliding bearing as in this way an electric drive with a short axial length can be realized.
  • peripheral wall of the housing is made of plastic. In this way, the housing can be produced very inexpensively in an injection molding process.
  • the drawing shows in section an inventive delivery unit.
  • the delivery unit for example a pump or a compressor, has a housing 1, in which a drive shaft 2 and a driven by the drive shaft 2, rotatably arranged rotor 3 is provided.
  • the drive shaft 2 has on an end facing the rotor 3 an inclined sliding surface 4, which rotates the rotor 3 with its rotor axis 5 upon rotation of the drive shaft 2 about a drive axis 6 of Drive shaft 2 tumble.
  • the rotor 3 has on its side facing the drive shaft 2 a co-operating with the oblique sliding surface 4 sliding surface 8 and facing away from the drive shaft 2 end face a toothing 9, which meshes with a trained example of the housing 1 10 teeth.
  • the inclined sliding surface 4 and the sliding surface 8 are formed, for example, as flat surfaces.
  • the toothing 9 of the rotor 3 and the toothing 10 of the housing 1 is designed, for example, as a cycloidal toothing, but may also be a different toothing.
  • the delivery unit works according to the displacement principle, so that the fluid is sucked in self-priming via the input 12 into the working chambers 11 and discharged from the latter via the output 13.
  • the drive shaft 1 has a through-passage 14 to transport fluid from the inlet 12 into the working spaces 11 or out of these to the outlet 13.
  • the portion of the housing 1, on which the toothing 10 is provided, is designed for example as a separate housing cover 15, which closes another portion of the housing 1, which is for example cylindrical or cup-shaped.
  • the drive shaft 2 has a first bearing section 18 facing the rotor 3 and a second bearing section 19 facing away from the rotor 3, wherein the first bearing section 18 of the drive shaft 2 is arranged in a first sliding bearing 20 and the second bearing section 19 is arranged in a second sliding bearing 21.
  • the diameter of the first bearing section 18 of the drive shaft 2 and of the first sliding bearing 20 is made larger than the diameter of the second bearing section 19 and the second sliding bearing 21.
  • the inclined sliding surface 4 adjoins the end face directly to the first bearing portion 18, and that substantially continuously or at least without extension of the diameter of the drive shaft second
  • an anchor portion 22 On the drive shaft 2 between the first bearing portion 18 and the second bearing portion 19, an anchor portion 22 is provided, which at its periphery Permanent magnets 23 which cooperate with an electrical winding 26 of an electric stator 27 which surrounds the armature portion 22 of the drive shaft 2 in an annular manner. In this way, a cost-effective electric motor is formed.
  • the stator 27 is formed for example by a package of stacked laminations of so-called electrical steel.
  • the permanent magnets 23 are arranged in at least one receptacle 25 of the drive shaft 2.
  • the permanent magnets 23 may be individual magnets or may be formed on a single magnetic ring, in the material of which magnetic powder is embedded.
  • the magnetic ring may be made of a plastic as a base material in which the magnetic powder is distributed.
  • the arranged in the receptacle 25 permanent magnets 23 may be sealed against the fluid of the delivery unit, for example by being covered by a jacket, not shown, which may also be a coating.
  • the permanent magnets 23 may be arranged eccentrically on the drive shaft 2 with respect to the stator 27 and in the direction of the drive shaft 6 so that the drive shaft 2 is pressed against the rotor 3 with a predetermined magnetic force.
  • the permanent magnets 23 are arranged offset to the drive shaft 2 relative to a central arrangement with respect to the stator 27 in the direction away from the rotor 3.
  • the anchor portion 22 of the drive shaft 2 has a diameter which is in the range between the diameter of the first bearing portion 18 and the diameter of the second bearing portion 19. In this way, two step-like shoulders 28 are formed between the two bearing sections 18, 19 of the drive shaft 2.
  • the first sliding bearing 20 and the second sliding bearing 21 are arranged on different sides of the stator 27, for example, in each case on one of the end faces.
  • the first sliding bearing 20 and the second sliding bearing 21 are provided on one of the drive shaft 2 facing peripheral wall 29 of the housing 1 of the delivery unit.
  • the peripheral wall 29 of the housing 1 defines a space for receiving the drive shaft 2.
  • the plain bearings 20,21 may be formed by the peripheral wall 29 itself or as a separate component, for example as a plain bearing bush, be arranged on the peripheral wall 29.
  • two stages 30 are provided in the peripheral wall 29 of the housing 1 between the two slide bearings 20,21, which separate the two slide bearings 20,21 of a stator 31, which is formed by its diameter is that results in the smallest possible air gap between the anchor portion 22 of the drive shaft 2 and the stator 31 of the housing 1.
  • the electric stator 27 is integrated according to the embodiment with its electrical winding 26 in the material of the peripheral wall 29 of the housing 1, wherein the stator 27 arranged in the peripheral wall 29 of the housing 1 in the axial direction between the first sliding bearing 20 and the second sliding bearing 21 is.
  • the integration of the stator 27 in the peripheral wall 29 of the housing 1 is achieved by the stator 27 is molded with its electrical winding 26 in the peripheral wall 29, that is completely or partially enclosed in the material of the peripheral wall 29.
  • the peripheral wall 29 of the housing 1 is made of plastic and injection molded.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Förderaggregat nach der Gattung des Hauptanspruchs.
Es ist schon ein Förderaggregat aus der DE 10 2010 040 758 A1 bekannt, mit einer Antriebswelle und einem von der Antriebswelle angetriebenen, drehbar angeordneten Rotor, wobei die Antriebswelle an einer Stirnseite eine schiefe Gleitfläche aufweist, die den Rotor mit seiner Rotorachse um eine Antriebsachse der Antriebswelle taumeln lässt, wobei die Antriebswelle einen dem Rotor zugewandten ersten Lagerabschnitt und einen dem Rotor abgewandten zweiten Lagerabschnitt aufweist. Der erste Lagerabschnitt der Antriebswelle ist in einem ersten Gleitlager und der zweite Lagerabschnitt in einem zweiten Gleitlager angeordnet. Auf das erste Gleitlager wirken bei Betrieb des Förderaggregates größere Kräfte als auf das zweite Gleitlager, da die in den Arbeitskammern des Förderaggregates auftretenden hydraulischen Druckkräfte über den Rotor und die schiefe Gleitfläche auf die Antriebswelle wirken und dabei vorwiegend von dem ersten Gleitlager aufgenommen werden müssen. Die Tragfähigkeit des dem Rotor zugewandten Gleitlagers ist jedoch bis zu einem vorbestimmten Arbeitsdruck im Förderaggregat begrenzt. Das Dokument US2010/233000A1 offenbart die Merkmale des Oberbegriffs von Anspruch 1.The invention relates to a delivery unit according to the preamble of the main claim.
It is already a delivery unit from the DE 10 2010 040 758 A1 known, with a drive shaft and driven by the drive shaft, rotatably mounted rotor, wherein the drive shaft on one end side has an inclined sliding surface, which can tumble the rotor with its rotor axis about a drive axis of the drive shaft, wherein the drive shaft facing the rotor first bearing portion and a second bearing portion facing away from the rotor. The first bearing portion of the drive shaft is arranged in a first sliding bearing and the second bearing portion in a second sliding bearing. On operation of the delivery unit, larger forces act on the first sliding bearing than on the second sliding bearing, since the hydraulic pressure forces occurring in the working chambers of the delivery unit act on the drive shaft via the rotor and the oblique sliding surface and must be absorbed predominantly by the first sliding bearing. However, the carrying capacity of the rotor facing the sliding bearing is limited to a predetermined working pressure in the delivery unit. The document US2010 / 233000A1 discloses the features of the preamble of claim 1.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Förderaggregat mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, dass die Tragfähigkeit des dem Rotor zugewandten ersten Gleitlagers gegenüber der Tragfähigkeit des zweiten Gleitlagers erhöht wird, indem der Durchmesser des ersten Lagerabschnitts der Antriebswelle und des ersten Gleitlagers jeweils größer ausgeführt ist als der Durchmesser des zweiten Lagerabschnitts und des zweiten Gleitlagers. Außerdem kann das Förderaggregat durch die erfindungsgemäße Ausführung in axialer Richtung der Antriebswelle gesehen kürzer gebaut werden.The delivery unit according to the invention with the characterizing features of the main claim has the advantage that the carrying capacity of the rotor facing the first slide bearing is increased compared to the carrying capacity of the second slide bearing by the diameter of the first bearing portion of the drive shaft and the first slide bearing is made larger than the Diameter of the second bearing section and the second sliding bearing. In addition, the delivery unit seen by the inventive design in the axial direction of the drive shaft to be built shorter.

Durch die unterschiedlichen Durchmesser der beiden Lagerabschnitte ist zwischen dem ersten Lagerabschnitt und dem zweiten Lagerabschnitt zumindest ein stufenförmiger Absatz gebildet. Die Antriebswelle ist dadurch besonders leicht aus einem Spritzwerkzeug einer Spritzgussmaschine entformbar.Due to the different diameters of the two bearing sections, at least one step-shaped shoulder is formed between the first bearing section and the second bearing section. The drive shaft is thereby particularly easily demoulded from an injection mold of an injection molding machine.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Hauptanspruch angegebenen Förderaggregates möglich.The measures listed in the dependent claims advantageous refinements and improvements of the main claim conveying unit are possible.

Gemäß der Erfindung ist an der Antriebswelle zwischen den beiden Lagerabschnitten ein Ankerabschnitt vorgesehen, der an seinem Umfang Permanentmagnete aufweist, die mit einer elektrischen Wicklung eines elektrischen Stators eines Elektromotors zusammenwirken, der den Ankerabschnitt der Antriebswelle ringförmig umgibt. Auf diese Weise ist ein kostengünstiger elektrischer Antrieb realisiert, dessen Anker in der Antriebswelle integriert ist.According to the invention, an armature portion is provided on the drive shaft between the two bearing portions, which has permanent magnets on its circumference, which cooperate with an electrical winding of an electric stator of an electric motor which surrounds the armature portion of the drive shaft in an annular manner. In this way, a cost-effective electric drive is realized, whose armature is integrated in the drive shaft.

Besonders vorteilhaft ist, wenn der Ankerabschnitt einen Durchmesser aufweist, der im Bereich zwischen dem Durchmesser des ersten Lagerabschnitts und dem Durchmesser des zweiten Lagerabschnitts liegt. Auf diese Weise werden zwischen den beiden Lagerabschnitten zwei stufenförmige Absätze gebildet. Durch diese zweistufige Ausführung kann der Durchmesser des Ankerabschnittes für jede neue Auslegung im Bereich zwischen den Durchmessern des ersten und des zweiten Lagerabschnitts optimal ausgewählt werden. Durch das Wählen eines optimalen Verhältnisses vom Durchmesser der Permanentmagnete zum Außendurchmesser des elektrischen Stators des Elektromotors kann auf einfache Art und Weise der Wirkungsgrad des Elektromotors optimiert werden. Gemäß der Erfindung sind das erste Gleitlager und das zweite Gleitlager jeweils an einer Stirnseite des Stators angeordnet da die beiden Gleitlager auf diese Weise in einer Umfangswandung des Gehäuses des Förderaggregates integriert und dadurch kostengünstig hergestellt werden können.It is particularly advantageous if the anchor portion has a diameter which is in the range between the diameter of the first bearing portion and the diameter of the second bearing portion. In this way, two stepped heels are formed between the two bearing sections. Through this two-stage design, the diameter of the anchor portion for each new design in the range between the diameters of the first and the second bearing portion can be optimally selected. By choosing an optimal ratio of the diameter of the permanent magnets to the outer diameter of the electric stator of the electric motor, the efficiency of the electric motor can be optimized in a simple manner. According to the invention, the first sliding bearing and the second sliding bearing are each arranged on an end face of the stator because the two sliding bearings integrated in this way in a peripheral wall of the housing of the delivery unit and thereby can be produced inexpensively.

Darüber hinaus vorteilhaft ist, wenn in der Umfangswandung des Gehäuses zwischen den beiden Gleitlagern zwei Stufen gebildet sind, die die beiden Gleitlager von einem Statorbereich trennen, da das Gehäuse auf diese Weise besonders leicht aus einem Spritzwerkzeug einer Spritzgussmaschine entformbar ist.Moreover, it is advantageous if in the circumferential wall of the housing between the two plain bearings two stages are formed, which separate the two plain bearings of a stator, since the housing is particularly easily removed from an injection mold of an injection molding machine in this way.

Vorteilhaft ist, wenn der Stator mit seiner elektrischen Wicklung in dem Material der Umfangswandung des Gehäuses des Förderaggregates integriert ist, da der Stator und dessen elektrische Wicklung auf diese Weise gegenüber dem Fördermedium abgedichtet sind. Die Abdichtung erfolgt, indem der Stator an seinen Stirnseiten und auch an seiner inneren und äußeren Umfangsseite von Kunststoff umspritzt ist. Gemäß der Erfindung ist der Stator in der Umfangswandung des Gehäuses in axialer Richtung gesehen zwischen dem ersten Gleitlager und dem zweiten Gleitlager angeordnet da auf diese Weise ein elektrischer Antrieb mit kurzer axialer Baulänge realisiert werden kann.It is advantageous if the stator is integrated with its electrical winding in the material of the peripheral wall of the housing of the delivery unit, since the stator and its electrical winding are sealed in this way against the fluid. The seal is made by the stator is encapsulated on its front sides and also on its inner and outer peripheral side of plastic. According to the invention, the stator is arranged in the circumferential wall of the housing in the axial direction between the first sliding bearing and the second sliding bearing as in this way an electric drive with a short axial length can be realized.

Außerdem vorteilhaft ist, wenn die Umfangswandung des Gehäuses aus Kunststoff hergestellt ist. Auf diese Weise kann das Gehäuse sehr kostengünstig in einem Spritzgussprozess hergestellt werden.It is also advantageous if the peripheral wall of the housing is made of plastic. In this way, the housing can be produced very inexpensively in an injection molding process.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in simplified form in the drawing and explained in more detail in the following description.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Zeichnung zeigt im Schnitt ein erfindungsgemäßes Förderaggregat.The drawing shows in section an inventive delivery unit.

Das Förderaggregat, beispielsweise eine Pumpe oder ein Verdichter, hat ein Gehäuse 1, in dem eine Antriebswelle 2 und ein von der Antriebswelle 2 angetriebener, drehbar angeordneter Rotor 3 vorgesehen ist. Die Antriebswelle 2 weist an einer dem Rotor 3 zugewandten Stirnseite eine schiefe Gleitfläche 4 auf, die den Rotor 3 mit seiner Rotorachse 5 bei Rotation der Antriebswelle 2 um eine Antriebsachse 6 der Antriebswelle 2 taumeln lässt. Der Rotor 3 weist an seiner der Antriebswelle 2 zugewandten Seite eine mit der schiefen Gleitfläche 4 zusammenwirkende Gleitfläche 8 und an seiner der Antriebswelle 2 abgewandten Stirnseite eine Verzahnung 9 auf, die mit einer beispielsweise am Gehäuse 1 ausgebildeten Verzahnung 10 kämmt. Die schiefe Gleitfläche 4 und die Gleitfläche 8 sind beispielsweise als ebene Flächen ausgebildet. Zwischen der Verzahnung 9 des Rotors 3 und der Verzahnung 10 des Gehäuses 1 sind Arbeitsräume 11 gebildet, die über einen Eingang 12 des Förderaggregates befüllbar und über einen Ausgang 13 des Förderaggregates entleerbar sind. Die Verzahnung 9 des Rotors 3 und die Verzahnung 10 des Gehäuses 1 ist beispielsweise als Zykloidenverzahnung ausgeführt, kann aber auch eine andere Verzahnung sein. Das Förderaggregat arbeitet nach dem Verdrängungsprinzip, so dass das Fluid selbstansaugend über den Eingang 12 in die Arbeitsräume 11 angesaugt und aus diesen druckerhöht über den Ausgang 13 ausgestoßen wird. Die Antriebswelle 1 weist einen Durchgangskanal 14 auf, um Fluid vom Eingang 12 in die Arbeitsräume 11 oder aus diesen heraus zum Ausgang 13 zu transportieren. Welche Öffnung 12, 13 des Förderaggregates Eingang oder Ausgang ist, hängt von der Drehrichtung des Rotors 3 ab. Der Abschnitt des Gehäuses 1, an dem die Verzahnung 10 vorgesehen ist, ist beispielsweise als separater Gehäusedeckel 15 ausgeführt, der einen anderen Abschnitt des Gehäuses 1, der beispielsweise zylinderförmig oder topfförmig ausgeführt ist, verschließt.The delivery unit, for example a pump or a compressor, has a housing 1, in which a drive shaft 2 and a driven by the drive shaft 2, rotatably arranged rotor 3 is provided. The drive shaft 2 has on an end facing the rotor 3 an inclined sliding surface 4, which rotates the rotor 3 with its rotor axis 5 upon rotation of the drive shaft 2 about a drive axis 6 of Drive shaft 2 tumble. The rotor 3 has on its side facing the drive shaft 2 a co-operating with the oblique sliding surface 4 sliding surface 8 and facing away from the drive shaft 2 end face a toothing 9, which meshes with a trained example of the housing 1 10 teeth. The inclined sliding surface 4 and the sliding surface 8 are formed, for example, as flat surfaces. Between the teeth 9 of the rotor 3 and the teeth 10 of the housing 1 working spaces 11 are formed, which can be filled via an input 12 of the delivery unit and emptied via an output 13 of the delivery unit. The toothing 9 of the rotor 3 and the toothing 10 of the housing 1 is designed, for example, as a cycloidal toothing, but may also be a different toothing. The delivery unit works according to the displacement principle, so that the fluid is sucked in self-priming via the input 12 into the working chambers 11 and discharged from the latter via the output 13. The drive shaft 1 has a through-passage 14 to transport fluid from the inlet 12 into the working spaces 11 or out of these to the outlet 13. Which opening 12, 13 of the delivery unit is input or output depends on the direction of rotation of the rotor 3. The portion of the housing 1, on which the toothing 10 is provided, is designed for example as a separate housing cover 15, which closes another portion of the housing 1, which is for example cylindrical or cup-shaped.

Die Antriebswelle 2 weist einen dem Rotor 3 zugewandten ersten Lagerabschnitt 18 und einen dem Rotor 3 abgewandten zweiten Lagerabschnitt 19 auf, wobei der erste Lagerabschnitt 18 der Antriebswelle 2 in einem ersten Gleitlager 20 und der zweite Lagerabschnitt 19 in einem zweiten Gleitlager 21 angeordnet ist.The drive shaft 2 has a first bearing section 18 facing the rotor 3 and a second bearing section 19 facing away from the rotor 3, wherein the first bearing section 18 of the drive shaft 2 is arranged in a first sliding bearing 20 and the second bearing section 19 is arranged in a second sliding bearing 21.

Erfindungsgemäß ist vorgesehen, dass der Durchmesser des ersten Lagerabschnitts 18 der Antriebswelle 2 und des ersten Gleitlagers 20 jeweils größer ausgeführt ist als der Durchmesser des zweiten Lagerabschnitts 19 und des zweiten Gleitlagers 21. Dadurch wird die Tragfähigkeit des dem Rotor 3 zugewandten ersten Gleitlagers 20 erhöht. Die schiefe Gleitfläche 4 schließt sich stirnseitig unmittelbar an den ersten Lagerabschnitt 18 an, und zwar im wesentlichen stufenlos oder zumindest ohne Erweiterung des Durchmessers der Antriebswelle 2.According to the invention, it is provided that the diameter of the first bearing section 18 of the drive shaft 2 and of the first sliding bearing 20 is made larger than the diameter of the second bearing section 19 and the second sliding bearing 21. As a result, the load bearing capacity of the first sliding bearing 20 facing the rotor 3 is increased. The inclined sliding surface 4 adjoins the end face directly to the first bearing portion 18, and that substantially continuously or at least without extension of the diameter of the drive shaft second

An der Antriebswelle 2 zwischen dem ersten Lagerabschnitt 18 und dem zweiten Lagerabschnitt 19 ist ein Ankerabschnitt 22 vorgesehen, der an seinem Umfang Permanentmagnete 23 aufweist, die mit einer elektrischen Wicklung 26 eines elektrischen Stators 27 zusammenwirken, der den Ankerabschnitt 22 der Antriebswelle 2 ringförmig umgibt. Auf diese Weise wird ein kostengünstiger Elektromotor gebildet. Der Stator 27 ist beispielsweise durch ein Paket von übereinander geschichteten Blechlamellen aus sogenanntem Elektroblech gebildet. Die Permanentmagnete 23 sind in zumindest einer Aufnahme 25 der Antriebswelle 2 angeordnet. Die Permanentmagnete 23 können Einzelmagnete sein oder an einem einzigen Magnetring ausgebildet sein, in dessen Material Magnetpulver eingebettet ist. Beispielsweise kann der Magnetring aus einem Kunststoff als Basiswerkstoff hergestellt sein, in dem das Magnetpulver verteilt vorliegt. Die in der Aufnahme 25 angeordneten Permanentmagnete 23 können gegenüber dem Fluid des Förderaggregates abgedichtet sein, beispielsweise indem sie von einer nicht dargestellten Ummantelung, die auch eine Beschichtung sein kann, überdeckt sind. Die Permanentmagnete 23 können an der Antriebswelle 2 bezüglich des Stators 27 und in Richtung der Antriebsachse 6 gesehen derart außermittig angeordnet sein, dass die Antriebswelle 2 mit einer vorbestimmten Magnetkraft gegen den Rotor 3 gedrückt wird. Die Permanentmagnete 23 sind dazu an der Antriebswelle 2 gegenüber einer bezüglich des Stators 27 mittigen Anordnung in vom Rotor 3 abgewandter Richtung versetzt angeordnet.On the drive shaft 2 between the first bearing portion 18 and the second bearing portion 19, an anchor portion 22 is provided, which at its periphery Permanent magnets 23 which cooperate with an electrical winding 26 of an electric stator 27 which surrounds the armature portion 22 of the drive shaft 2 in an annular manner. In this way, a cost-effective electric motor is formed. The stator 27 is formed for example by a package of stacked laminations of so-called electrical steel. The permanent magnets 23 are arranged in at least one receptacle 25 of the drive shaft 2. The permanent magnets 23 may be individual magnets or may be formed on a single magnetic ring, in the material of which magnetic powder is embedded. For example, the magnetic ring may be made of a plastic as a base material in which the magnetic powder is distributed. The arranged in the receptacle 25 permanent magnets 23 may be sealed against the fluid of the delivery unit, for example by being covered by a jacket, not shown, which may also be a coating. The permanent magnets 23 may be arranged eccentrically on the drive shaft 2 with respect to the stator 27 and in the direction of the drive shaft 6 so that the drive shaft 2 is pressed against the rotor 3 with a predetermined magnetic force. The permanent magnets 23 are arranged offset to the drive shaft 2 relative to a central arrangement with respect to the stator 27 in the direction away from the rotor 3.

Der Ankerabschnitt 22 der Antriebswelle 2 hat einen Durchmesser, der im Bereich zwischen dem Durchmesser des ersten Lagerabschnitts 18 und dem Durchmesser des zweiten Lagerabschnitts 19 liegt. Auf diese Weise werden zwischen den beiden Lagerabschnitten 18,19 der Antriebswelle 2 zwei stufenförmige Absätze 28 gebildet.The anchor portion 22 of the drive shaft 2 has a diameter which is in the range between the diameter of the first bearing portion 18 and the diameter of the second bearing portion 19. In this way, two step-like shoulders 28 are formed between the two bearing sections 18, 19 of the drive shaft 2.

Das erste Gleitlager 20 und das zweite Gleitlager 21 sind auf unterschiedlichen Seiten des Stators 27 angeordnet, beispielsweise jeweils auf einer der Stirnseiten. Das erste Gleitlager 20 und das zweite Gleitlager 21 sind an einer der Antriebswelle 2 zugewandten Umfangswandung 29 des Gehäuses 1 des Förderaggregates vorgesehen. Die Umfangswandung 29 des Gehäuses 1 begrenzt einen Raum zur Aufnahme der Antriebswelle 2. Die Gleitlager 20,21 können durch die Umfangswandung 29 selbst gebildet oder als separates Bauteil, beispielsweise als Gleitlagerbuchse, an der Umfangswandung 29 angeordnet sein. Gemäß dem Ausführungsbeispiel sind in der Umfangswandung 29 des Gehäuses 1 zwischen den beiden Gleitlagern 20,21 zwei Stufen 30 vorgesehen, die die beiden Gleitlager 20,21 von einem Statorbereich 31 trennen, der von seinem Durchmesser derart ausgebildet ist, dass sich zwischen dem Ankerabschnitt 22 der Antriebswelle 2 und dem Statorbereich 31 des Gehäuses 1 ein möglichst kleiner Luftspalt ergibt.The first sliding bearing 20 and the second sliding bearing 21 are arranged on different sides of the stator 27, for example, in each case on one of the end faces. The first sliding bearing 20 and the second sliding bearing 21 are provided on one of the drive shaft 2 facing peripheral wall 29 of the housing 1 of the delivery unit. The peripheral wall 29 of the housing 1 defines a space for receiving the drive shaft 2. The plain bearings 20,21 may be formed by the peripheral wall 29 itself or as a separate component, for example as a plain bearing bush, be arranged on the peripheral wall 29. According to the embodiment, two stages 30 are provided in the peripheral wall 29 of the housing 1 between the two slide bearings 20,21, which separate the two slide bearings 20,21 of a stator 31, which is formed by its diameter is that results in the smallest possible air gap between the anchor portion 22 of the drive shaft 2 and the stator 31 of the housing 1.

Der elektrische Stator 27 ist gemäß dem Ausführungsbeispiel mit seiner elektrischen Wicklung 26 in dem Material der Umfangswandung 29 des Gehäuses 1 integriert, wobei der Stator 27 in der Umfangswandung 29 des Gehäuses 1 in axialer Richtung gesehen zwischen dem ersten Gleitlager 20 und dem zweiten Gleitlager 21 angeordnet ist. Die Integration des Stators 27 in der Umfangswandung 29 des Gehäuses 1 wird erreicht, indem der Stator 27 mit seiner elektrischen Wicklung 26 in der Umfangswandung 29 mit eingegossen ist, also vollständig oder teilweise im Material der Umfangswandung 29 eingeschlossen ist. Dazu ist die Umfangswandung 29 des Gehäuses 1 aus Kunststoff und mittels Spritzguss hergestellt.The electric stator 27 is integrated according to the embodiment with its electrical winding 26 in the material of the peripheral wall 29 of the housing 1, wherein the stator 27 arranged in the peripheral wall 29 of the housing 1 in the axial direction between the first sliding bearing 20 and the second sliding bearing 21 is. The integration of the stator 27 in the peripheral wall 29 of the housing 1 is achieved by the stator 27 is molded with its electrical winding 26 in the peripheral wall 29, that is completely or partially enclosed in the material of the peripheral wall 29. For this purpose, the peripheral wall 29 of the housing 1 is made of plastic and injection molded.

Claims (6)

  1. Pump unit having a drive shaft (2) and a rotatably arranged rotor (3) which is driven by the drive shaft (2), the drive shaft (2) having, on an end side, an oblique sliding face (4) which causes the rotor (3) with its rotor axis (5) to tumble during rotation of the drive shaft about a drive axis (6) of the drive shaft (1), the drive shaft (2) having a first bearing section (18) which faces the rotor (3) and a second bearing section (19) which faces away from the rotor (3), the first bearing section (18) of the drive shaft (2) being arranged in a first plain bearing (20), and the second bearing section (19) being arranged in a second plain bearing (21),
    characterized in that
    - the diameter of the first bearing section (18) of the drive shaft (2) and of the first plain bearing (20) is in each case of greater configuration than the diameter of the second bearing section (19) and of the second plain bearing (21), and in that
    - the first plain bearing (20) and the second plain bearing (21) are provided on a circumferential wall (29) of a housing (1) of the pump unit and are formed by the circumferential wall (29) itself or are provided in each case as a separate component, in that
    - an armature section (22) is provided on the drive shaft (2) between the first bearing section (18) and the second bearing section (19), which armature section (22) has, on its circumference, permanent magnets (23) which interact with an electric winding (26) of an electric stator (27) which surrounds the armature section (22) of the drive shaft (2), and in that
    - the stator (27) is arranged in the circumferential wall (29) of the housing (1) between the first plain bearing (20) and the second plain bearing (21) as viewed in the axial direction.
  2. Pump unit according to Claim 1, characterized in that the armature section (22) has a diameter which lies in the range between the diameter of the first bearing section (18) and the diameter of the second bearing section (19).
  3. Pump unit according to one of the preceding claims, characterized in that the first plain bearing (20) and the second plain bearing (21) are arranged in each case on an end side of the stator (27).
  4. Pump unit according to one of the preceding claims, characterized in that two steps (30) are provided in the circumferential wall (29) of the housing (1) between the two plain bearings (20, 21), which steps (30) separate the two plain bearings (20, 21) from a stator region (31).
  5. Pump unit according to one of the preceding claims, characterized in that the stator (27) with its electric winding (26) is integrated into the material of the circumferential wall (29) of the housing (1).
  6. Pump unit according to one of the preceding claims, characterized in that the circumferential wall (29) of the housing (1) is manufactured from plastic.
EP15744157.7A 2014-09-24 2015-07-22 Pump unit Active EP3198145B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014219219.6A DE102014219219A1 (en) 2014-09-24 2014-09-24 delivery unit
PCT/EP2015/066750 WO2016045817A1 (en) 2014-09-24 2015-07-22 Pump unit

Publications (2)

Publication Number Publication Date
EP3198145A1 EP3198145A1 (en) 2017-08-02
EP3198145B1 true EP3198145B1 (en) 2018-07-04

Family

ID=53761349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15744157.7A Active EP3198145B1 (en) 2014-09-24 2015-07-22 Pump unit

Country Status (4)

Country Link
US (1) US10151312B2 (en)
EP (1) EP3198145B1 (en)
DE (1) DE102014219219A1 (en)
WO (1) WO2016045817A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102017203521A1 (en) 2017-03-03 2018-09-06 Robert Bosch Gmbh delivery unit
DE102021103306A1 (en) 2021-02-12 2022-08-18 Kolektor Group D.O.O. Hand-held hydraulic fluid device
WO2023186297A1 (en) * 2022-03-30 2023-10-05 Pierburg Gmbh Electric machine

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JP4516641B2 (en) 1999-06-18 2010-08-04 キヤノンアネルバ株式会社 Fluid pressure feeder
DE10254670A1 (en) * 2002-11-22 2004-06-24 Minebea Co., Ltd. Electric motor for a pump drive
EP1664541B1 (en) 2003-09-11 2012-03-14 Robert Bosch GmbH Rotating piston machine
DE102005015014A1 (en) * 2004-04-02 2005-11-03 Denso Corp., Kariya Fuel pump, fuel supply device using the fuel pump and method of manufacturing the fuel pump
US8834140B2 (en) 2004-05-25 2014-09-16 Cor Pumps + Compressors Ag Leakage loss flow control and associated media flow delivery assembly
WO2008110155A1 (en) * 2007-03-13 2008-09-18 Cor Pumps + Compressors Ag Pump or motor
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Also Published As

Publication number Publication date
US10151312B2 (en) 2018-12-11
DE102014219219A1 (en) 2016-03-24
WO2016045817A1 (en) 2016-03-31
US20170292516A1 (en) 2017-10-12
EP3198145A1 (en) 2017-08-02

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