EP3545196B1 - Motor vehicle electric coolant pump - Google Patents

Motor vehicle electric coolant pump Download PDF

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Publication number
EP3545196B1
EP3545196B1 EP17768126.9A EP17768126A EP3545196B1 EP 3545196 B1 EP3545196 B1 EP 3545196B1 EP 17768126 A EP17768126 A EP 17768126A EP 3545196 B1 EP3545196 B1 EP 3545196B1
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EP
European Patent Office
Prior art keywords
outlet openings
coolant pump
motor vehicle
electric motor
unit
Prior art date
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Application number
EP17768126.9A
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German (de)
French (fr)
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EP3545196A1 (en
Inventor
Lars HEITZIG
Clemens REICHEL
DR. Hemke MAETER
Falk STEIGER
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Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Publication of EP3545196A1 publication Critical patent/EP3545196A1/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
    • 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
    • F04D13/0673—Units comprising pumps and their driving means the pump being electrically driven the motor being of the inside-out type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
    • 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
    • F04D13/064—Details of the magnetic circuit

Definitions

  • the invention relates to an electric motor vehicle coolant pump with a housing that has a pump unit and a motor unit, the motor unit having a motor rotor mounted in the housing by means of bearing means and a motor stator, the motor rotor having an impeller element and a drive element running in the axial direction and having an axis of rotation , blade elements of the pump unit being arranged on the impeller element, with inlet and outlet openings being provided in the pump unit with respective central axes, which enable a cooling fluid of the pump unit to flow through the motor unit, the outlet openings of the pump unit being provided in the impeller element, the outlet openings are provided in the motor rotor.
  • Electric motor vehicle coolant pumps with outlet openings for fluidic connection to the suction side of the pump unit are well known from the prior art. So reveals the DE 199 48 972 A1 a motor pump with a pump unit and a motor unit, the motor unit having a motor rotor designed as an external rotor which has an impeller element with blade elements. In order to cool the motor unit, it is known to conduct cooling fluid to be pumped from a pressure side of the pump unit through the motor unit to a suction side of the pump unit. According to the DE 199 48 972 A1 Here, an opening is provided in the housing in the area of the pump unit, through which the cooling fluid penetrates into the motor unit, the cooling fluid leaving the motor unit again via a motor rotor shaft designed as hollow.
  • the cooling fluid leaves the motor unit via openings in the bearing area of the motor rotor shaft.
  • the function and service life of the vehicle coolant pump can be affected by deposits of particles in the coolant, such as casting sand, are affected.
  • a hydro-abrasive flow occurs, which leads to high radial and axial bearing wear. From the DE 10 2009 009898 A1 and the U.S. 2004/0234395 A1
  • the EP 1 775 478 A2 shows a coolant pump according to the preamble of claim 1, with outlet channels in a hub of the pump impeller.
  • the object of the invention is therefore to avoid the disadvantage mentioned above in a simple and inexpensive manner.
  • the outlet openings run essentially in a tangential direction to the projected axis of rotation of the rotor element.
  • the angle ⁇ is preferably between 45° and 65°. This ensures a particularly reliable removal of the dirt particles, since the dirt particles are conveyed into the area of the blade elements.
  • the outlet openings are advantageously designed as bores which are arranged in a circular, evenly offset manner in the circumferential direction. Due to the embodiment of a coolant pump according to the invention, three outlet bores, for example, can be sufficient for the effective removal of the dirt particles.
  • the motor rotor is pot-shaped, with the drive element being cylindrical. Despite the pot-shaped design of the motor rotor, the dirt particles are removed from the interior of the motor rotor without leaving any residue. In a particularly advantageous manner, the motor rotor is an external rotor.
  • the outlet openings are provided in the outermost area of the impeller element or, in the case of a pot-shaped design of the motor rotor, in the impeller element or in the cylindrical drive element in the area of the transition from the impeller element to the drive element. In this way, the dirt particles are particularly effectively prevented from remaining in the pot-shaped motor rotor.
  • the motor unit is advantageously an electronically commutated electric motor.
  • the inlet opening can advantageously be designed as an annular gap between the housing and the cylindrical drive element. Particularly with the wet-running principle, there is naturally an annular gap between the cylindrical drive element and the housing, which forms the inlet opening in a simple manner.
  • FIG 1 shows a sectional view of a motor vehicle coolant pump 2 according to the invention.
  • the motor vehicle coolant pump 2 has a multi-part housing 4 made of plastic, in which a motor unit 6 and a pump unit 8 are essentially provided.
  • the pump unit 8 essentially consists of an impeller element 9 which has an axis of rotation 10 .
  • the impeller element 9 has blade elements 12 molded on in a known manner.
  • the impeller element 9 causes a pressure build-up in the housing part 14 of the pump unit 8 in a known manner, with cooling fluid being able to be supplied via an inlet connection 16 and via an outlet connection 18 is deductible.
  • the impeller element 9 of the pump unit 8 is connected in one piece to a cylindrical drive element 20 of the motor unit 6 and in this way forms a pot-shaped motor rotor 22.
  • Such an arrangement is usually referred to as an external rotor.
  • the motor rotor 22 is mounted in a known manner in a containment shell 26 of the housing 4 via bearing means 24 .
  • motor rotor 22 together with a motor stator 28 forms an electronically commutated electric motor, with embedded permanent magnets (not shown here) being provided in drive element 20 of motor rotor 22, so that motor rotor 22 is dragged along by the rotationally migrating magnetic field that can be generated in motor stator 28 and rotates is transferred.
  • an annular gap is provided between the housing 4 , here between the housing part 14 and the cylindrical drive element 20 , as an inlet opening 30 for a cooling fluid to be cooled for the motor unit 6 .
  • the cooling fluid thus circulates via this inlet opening 30 from a pressure side 32 of the pump unit 8 into a gap between the cylindrical drive element 20 and the containment shell 18 towards outlet openings 33, which in turn have central axes 34, to a suction side 36 of the pump unit 8.
  • Any dirt particles present in the cooling fluid are collected in the transition 38 between the cylindrical drive element 20 and the impeller element 9 due to their centrifugal force, so that they cannot damage the motor unit 6 and here in particular the bearing means 24 .
  • figure 2 shows a schematic view of the cooling fluid flow from the inlet opening 30 between the housing 4 and the drive element 20 via a gap between the drive element 20 and the containment can 26 to the outlet openings 33.
  • figure 3 shows a perspective view of the impeller element 9 and the outlet openings 33, which are designed here as bores and which are arranged in a circle offset by 120°.
  • the outlet openings 33 have a tangential direction.
  • This uses the outlet opening 33; by being oriented in the flow direction, the speed difference between the impeller member 9 and the cooling fluid. This causes the cooling fluid to be guided in a flow-oriented manner from the interior of the motor rotor 22 into the housing part 14, as a result of which an accumulation of dirt particles is effectively avoided.
  • FIG 4 10 now shows the inside of the impeller element 9 in a perspective view figure 2 . Due to the arrangement of the outlet bores according to the invention, dirt particles no longer collect in a pot bend 40 of the impeller element 9 . With an inner diameter of the impeller element 9 of 35 mm, the outlet openings 33 have a diameter of 4 mm and are arranged on a circular path with a radius of 15.5 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine elektrische KFZ-Kühlmittelpumpe mit einem Gehäuse, das eine Pumpeneinheit und eine Motoreinheit aufweist, wobei die Motoreinheit einen mittels Lagermitteln im Gehäuse gelagerten Motorrotor sowie einen Motorstator besitzt, wobei der Motorrotor ein Laufradorgan und ein in Axialrichtung verlaufendes Antriebsorgan mit einer Drehachse aufweist, wobei an dem Laufradorgan Schaufelelemente der Pumpeneinheit angeordnet sind, wobei Einlass- und Auslassöffnungen in der Pumpeneinheit mit jeweiligen Mittelachsen vorgesehen sind, die ein Durchströmen der Motoreinheit mit einem Kühlfluid der Pumpeneinheit ermöglicht, wobei im Laufradorgan die Auslassöffnungen der Pumpeneinheit vorgesehen sind, wobei die Auslassöffnungen im Motorrotor vorgesehen sind.The invention relates to an electric motor vehicle coolant pump with a housing that has a pump unit and a motor unit, the motor unit having a motor rotor mounted in the housing by means of bearing means and a motor stator, the motor rotor having an impeller element and a drive element running in the axial direction and having an axis of rotation , blade elements of the pump unit being arranged on the impeller element, with inlet and outlet openings being provided in the pump unit with respective central axes, which enable a cooling fluid of the pump unit to flow through the motor unit, the outlet openings of the pump unit being provided in the impeller element, the outlet openings are provided in the motor rotor.

Elektrische KFZ-Kühlmittelpumpen mit Auslassöffnungen zur fluidischen Verbindung mit der Saugseite der Pumpeneinheit sind aus dem Stand der Technik hinlänglich bekannt. So offenbart die DE 199 48 972 A1 eine Motorpumpe mit einer Pumpeneinheit und einer Motoreinheit, wobei die Motoreinheit einen als Außenläufer gestalteten Motorrotor besitzt, der ein Laufradorgan mit Schaufelelementen besitzt. Zur Kühlung der Motoreinheit ist es bekannt, zu pumpendes Kühlfluid von einer Druckseite der Pumpeneinheit durch die Motoreinheit hin zu einer Saugseite der Pumpeneinheit zu führen. Gemäß der DE 199 48 972 A1 ist hier eine Öffnung im Gehäuse im Bereich der Pumpeneinheit vorgesehen, durch die das Kühlfluid in die Motoreinheit dringt, wobei das Kühlfluid die Motoreinheit über eine hohl ausgeführte Motorrotorwelle wieder verlässt. Des Weiteren ist es bekannt, dass das Kühlfluid die Motoreinheit über Öffnungen im Lagerbereich der Motorrotorwelle verlässt. In beiden Fällen kann die Funktion und Lebensdauer der KFZ-Kühlmittelpumpe durch Ablagerungen von im Kühlfluid befindlichen Teilchen, wie zum Beispiel Gießsand, beeinträchtigt werden. Insbesondere bei einer Ableitung des Kühlfluids durch den Lagerbereich kommt es zu einer hydroabrasiven Strömung, die zu einem hohen radialen und axialen Lagerverschleiß führt. Aus der DE 10 2009 009898 A1 und der US 2004/0234395 A1 ist es hierzu bekannt, Auslassöffnungen im Laufradorgan vorzusehen, um die Schmutzteilchen über die Auslassöffnungen abzuführen, wobei jedoch noch immer auch eine Verschmutzung des Lagerbereiches stattfindet.Electric motor vehicle coolant pumps with outlet openings for fluidic connection to the suction side of the pump unit are well known from the prior art. So reveals the DE 199 48 972 A1 a motor pump with a pump unit and a motor unit, the motor unit having a motor rotor designed as an external rotor which has an impeller element with blade elements. In order to cool the motor unit, it is known to conduct cooling fluid to be pumped from a pressure side of the pump unit through the motor unit to a suction side of the pump unit. According to the DE 199 48 972 A1 Here, an opening is provided in the housing in the area of the pump unit, through which the cooling fluid penetrates into the motor unit, the cooling fluid leaving the motor unit again via a motor rotor shaft designed as hollow. Furthermore, it is known that the cooling fluid leaves the motor unit via openings in the bearing area of the motor rotor shaft. In both cases, the function and service life of the vehicle coolant pump can be affected by deposits of particles in the coolant, such as casting sand, are affected. In particular, when the cooling fluid is discharged through the bearing area, a hydro-abrasive flow occurs, which leads to high radial and axial bearing wear. From the DE 10 2009 009898 A1 and the U.S. 2004/0234395 A1 For this purpose it is known to provide outlet openings in the impeller element in order to discharge the dirt particles via the outlet openings, although the bearing area is still soiled.

Hierzu ist es aus der EP 3 012 457 A1 bekannt die Auslassöffnungen im Bereich der vom Motorrotormittelpunkt abgewandten Enden der Schaufelelemente an zu ordnen, wobei die Bohrung und damit eine Mittelachse der Auslassöffnungen in Richtung der Schaufelelemente verläuft. Zwar kann der Lagerverschleiß mit einer derartigen Ausführungsform verhindert werden, jedoch zeigt sich auch, dass Schmutzpartikel im zur Motoreinheit gerichteten Raum des Laufradorgans verbleiben und folglich die Ausfallwahrscheinlichkeit der Kühlmittelpumpe erhöhen. Auch die JP 2007-332839 A und die DE 10 2013 107 986 A offenbaren Ausassöffnungen im Rotorbereich, deren Mittelachsen parallel zur Mittelachse des Rotors verlaufen.For this it is from the EP 3 012 457 A1 It is known to arrange the outlet openings in the region of the ends of the blade elements facing away from the center of the motor rotor, with the bore and thus a central axis of the outlet openings running in the direction of the blade elements. Although bearing wear can be prevented with such an embodiment, it has also been shown that dirt particles remain in the space of the impeller element facing the motor unit and consequently increase the probability of failure of the coolant pump. Also the JP 2007-332839 A and the DE 10 2013 107 986 A disclose outlet openings in the rotor area, the central axes of which run parallel to the central axis of the rotor.

Darüberhinaus ist aus der JP 2012-145022 A eine Kühlmittelpumpe mit einem Schmir- bzw. Kühlkreislauf bekannt. Die EP 1 775 478 A2 zeigt eine Kühlmittelpumpe nach dem Oberbegriff des Anspruchs 1, mit Auslasskanälen in einer Nabe des Pumpenlaufrades.In addition, from the JP 2012-145022 A a coolant pump with a lubricant or cooling circuit is known. the EP 1 775 478 A2 shows a coolant pump according to the preamble of claim 1, with outlet channels in a hub of the pump impeller.

Aufgabe der Erfindung ist es daher, den oben genannten Nachteil auf einfache und kostengünstige Weise zu vermeiden.The object of the invention is therefore to avoid the disadvantage mentioned above in a simple and inexpensive manner.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.According to the invention, this object is achieved by the features of claim 1 .

Durch die beschriebene Ausführung der Kühlmittelpumpe entweichen die Schmutzpartikel über die Auslassöffnung nahezu vollständig, ohne dass Schmutzpartikel im Bereich des Motorrotors verbleiben und gegebenenfalls die Pumpeneinheit beschädigen.Due to the design of the coolant pump described, the dirt particles escape almost completely via the outlet opening, without dirt particles in the area of the motor rotor and possibly damage the pump unit.

Erfindungsgemäß verlaufen die Auslassöffnungen im Wesentlichen in tangentialer Richtung zur projezierten Drehachse des Laufradorgans. Vorzugsweise beträgt hierbei der Winkel α zwischen 45° - 65°. Hierdurch wird ein besonders sicherer Abtransport der Schmutzpartikel gewährleistet, da die Schmutzpartikel in den Bereich der Schaufelelemente gefördert werden.According to the invention, the outlet openings run essentially in a tangential direction to the projected axis of rotation of the rotor element. In this case, the angle α is preferably between 45° and 65°. This ensures a particularly reliable removal of the dirt particles, since the dirt particles are conveyed into the area of the blade elements.

In vorteilhafter Weise sind die Auslassöffnungen als Bohrungen ausgeführt, die kreisförmig gleichmäßig in Umfangsrichtung versetzt angeordnet sind. Aufgrund der erfindungsgemäßen Ausführungsform einer Kühlmittelpumpe können beispielsweise drei Auslassbohrungen zum wirkungsvollen Abtransport der Schmutzpartikel ausreichen.The outlet openings are advantageously designed as bores which are arranged in a circular, evenly offset manner in the circumferential direction. Due to the embodiment of a coolant pump according to the invention, three outlet bores, for example, can be sufficient for the effective removal of the dirt particles.

In einer besonders vorteilhaften Ausführungsform ist der Motorrotor topfförmig ausgebildet, wobei das Antriebsorgan zylinderförmig ausgebildet ist. Trotz der topfförmigen Ausgestaltung des Motorrotors, werden die Schmutzpartikel rückstandslos aus dem Innenraum des Motorrotors abgeführt. In besonders vorteilhafter Weise ist der Motorrotor ein Außenläufer ist.In a particularly advantageous embodiment, the motor rotor is pot-shaped, with the drive element being cylindrical. Despite the pot-shaped design of the motor rotor, the dirt particles are removed from the interior of the motor rotor without leaving any residue. In a particularly advantageous manner, the motor rotor is an external rotor.

In besonders vorteilhafter Weise sind die Auslassöffnungen im äußersten Bereich des Laufradorgans beziehungsweise im Falle einer topfförmigen Ausbildung des Motorrotors im Laufradorgan oder im zylinderförmigen Antriebsorgan im Bereich des Übergangs vom Laufradorgan zum Antriebsorgan vorgesehen. Auf diese Weise wird ein Verbleiben der Schmutzpartikel im topfförmigen Motorrotor besonders wirksam vermieden.In a particularly advantageous manner, the outlet openings are provided in the outermost area of the impeller element or, in the case of a pot-shaped design of the motor rotor, in the impeller element or in the cylindrical drive element in the area of the transition from the impeller element to the drive element. In this way, the dirt particles are particularly effectively prevented from remaining in the pot-shaped motor rotor.

In vorteilhafter Weise ist die Motoreinheit ein elektronisch kommutierter Elektromotor.The motor unit is advantageously an electronically commutated electric motor.

Des Weiteren kann in vorteilhafter Weise die Einlassöffnung als ringförmiger Spalt zwischen dem Gehäuse und dem zylinderförmigen Antriebsorgan ausgeführt sind. Insbesondere beim Nassläuferprinzip ergibt sich naturgemäß ein ringförmiger Spalt zwischen dem zylinderförmigen Antriebsorgan und dem Gehäuse, welcher auf einfache Weise die Eintrittsöffnung ausbildet.Furthermore, the inlet opening can advantageously be designed as an annular gap between the housing and the cylindrical drive element. Particularly with the wet-running principle, there is naturally an annular gap between the cylindrical drive element and the housing, which forms the inlet opening in a simple manner.

Die Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert, hierbei zeigt:

  • Figur 1 eine Schnittansicht einer erfindungsgemäßen KFZ-Kühlmittelpumpen,
  • Figur 2 eine schematische Schnittansicht der KFZ-Kühlmittelpumpe aus Fig. 1,
  • Figur 3 eines perspektivische Außenansicht des Laufradorgans aus Figur 1 mit einer angedeuteten Auslassmittelachsenebene und einer angedeuteten Drehachsenebene, und
  • Figur 4 eine perspektivische Innenansicht des Laufradorgan aus Figur 3.
The invention is explained in more detail below with reference to a drawing, which shows:
  • figure 1 a sectional view of a motor vehicle coolant pump according to the invention,
  • figure 2 a schematic sectional view of the motor vehicle coolant pump 1 ,
  • figure 3 a perspective external view of the impeller member figure 1 having an indicated outlet central axis plane and an indicated axis of rotation plane, and
  • figure 4 a perspective inner view of the impeller element figure 3 .

Figur 1 zeigt in einer Schnittansicht eine erfindungsgemäße KFZ-Kühlmittelpumpe 2. Die KFZ-Kühlmittelpumpe 2 weist hierbei ein mehrteiliges Gehäuse 4 aus Kunststoff auf, in dem im Wesentlichen eine Motoreinheit 6 und eine Pumpeneinheit 8 vorgesehen sind. Die Pumpeneinheit 8 besteht im Wesentlichen aus einem Laufradorgan 9, das eine Drehachse 10 besitzt. Das Laufradorgan 9 weist auf bekannte Weise angeformte Schaufelelemente 12 auf. Auf bekannte Weise wird in diesem Ausführungsbeispiel durch das Laufradorgan 9 im Gehäuseteil 14 der Pumpeneinheit 8 ein Druckaufbau bewirkt, wobei Kühlfluid über einen Einlassanschluss 16 zuführbar und über einen Auslassanschluss 18 abführbar ist. Das Laufradorgan 9 der Pumpeneinheit 8 ist einstückig mit einem zylindrischen Antriebsorgan 20 der Motoreinheit 6 verbunden und bildet auf diese Weise einen topfförmigen Motorrotor 22. Eine derartige Anordnung wird üblicher Weise als Außenläufer bezeichnet. Der Motorrotor 22 ist hierbei über Lagermittel 24 in einem Spalttopf 26 des Gehäuses 4 auf bekannte Weise gelagert. Der Motorrotor 22 bildet also hier zusammen mit einem Motorstator 28 einen elektronisch kommutierten Elektromotor, wobei im Antriebsorgan 20 des Motorrotors 22 nicht weiter dargestellte eingebettete Permanentmagnete vorgesehen sind, so dass der Motorrotor 22 durch das in dem Motorstator 28 erzeugbare rotatorisch wandernde Magnetfeld mitgeschleppt und in Drehung versetzt wird. Als Einlassöffnung 30 für ein die Motoreinheit 6 zu kühlendes Kühlfluid ist im vorliegenden Ausführungsbeispiel ein ringförmiger Spalt zwischen dem Gehäuse 4, hier zwischen dem Gehäuseteil 14 und dem zylinderförmigen Antriebsorgan 20 vorgesehen. Das Kühlfluid zirkuliert also über diese Einlassöffnung 30 von einer Druckseite 32 der Pumpeneinheit 8 in einen Spalt zwischen dem zylinderförmigen Antriebsorgan 20 und dem Spalttopf 18 hin zu Auslassöffnungen 33, die ihrerseits Mittelachsen 34 aufweisen, zu einer Saugseite 36 der Pumpeneinheit 8 gefördert. Eventuell im Kühlfluid vorhandene Schmutzpartikel werden aufgrund ihrer Zentrifugalkraft im Übergang 38 zwischen dem zylinderförmigen Antriebsorgan 20 und dem Laufradorgan 9 gesammelt, so dass sie die Motoreinheit 6 und hier insbesondere die Lagermittel 24 nicht schädigen können. figure 1 shows a sectional view of a motor vehicle coolant pump 2 according to the invention. The motor vehicle coolant pump 2 has a multi-part housing 4 made of plastic, in which a motor unit 6 and a pump unit 8 are essentially provided. The pump unit 8 essentially consists of an impeller element 9 which has an axis of rotation 10 . The impeller element 9 has blade elements 12 molded on in a known manner. In this exemplary embodiment, the impeller element 9 causes a pressure build-up in the housing part 14 of the pump unit 8 in a known manner, with cooling fluid being able to be supplied via an inlet connection 16 and via an outlet connection 18 is deductible. The impeller element 9 of the pump unit 8 is connected in one piece to a cylindrical drive element 20 of the motor unit 6 and in this way forms a pot-shaped motor rotor 22. Such an arrangement is usually referred to as an external rotor. The motor rotor 22 is mounted in a known manner in a containment shell 26 of the housing 4 via bearing means 24 . Here, motor rotor 22 together with a motor stator 28 forms an electronically commutated electric motor, with embedded permanent magnets (not shown here) being provided in drive element 20 of motor rotor 22, so that motor rotor 22 is dragged along by the rotationally migrating magnetic field that can be generated in motor stator 28 and rotates is transferred. In the present exemplary embodiment, an annular gap is provided between the housing 4 , here between the housing part 14 and the cylindrical drive element 20 , as an inlet opening 30 for a cooling fluid to be cooled for the motor unit 6 . The cooling fluid thus circulates via this inlet opening 30 from a pressure side 32 of the pump unit 8 into a gap between the cylindrical drive element 20 and the containment shell 18 towards outlet openings 33, which in turn have central axes 34, to a suction side 36 of the pump unit 8. Any dirt particles present in the cooling fluid are collected in the transition 38 between the cylindrical drive element 20 and the impeller element 9 due to their centrifugal force, so that they cannot damage the motor unit 6 and here in particular the bearing means 24 .

Figur 2 zeigt in einer schematischen Ansicht den Kühlfluidstrom von der Einlassöffnung 30 zwischen dem Gehäuse 4 und dem Antriebsorgan 20 über einen Spalt zwischen dem Antriebsorgan 20 und dem Spalttopf 26 hin zu den Auslassöffnungen 33. figure 2 shows a schematic view of the cooling fluid flow from the inlet opening 30 between the housing 4 and the drive element 20 via a gap between the drive element 20 and the containment can 26 to the outlet openings 33.

Figur 3 zeigt noch einmal in einer perspektivischen Ansicht das Laufradorgan 9 und die Auslassöffnungen 33, die hier als Bohrungen ausgeführt sind, und die kreisförmig, um 120° versetzt, angeordnet sind. Die Auslassöffnungen 33 weisen eine tangentiale Richtung auf. Deren Mittelachse 34 schließt mit der in die jeweilige Auslassöffnung 33 projezierten Drehachse 10 einen Winkel α= 65° ein. Hierbei nutzt die Auslassöffnung 33; dadurch, dass sie in Strömungsrichtung ausgerichtet ist, die Geschwindigkeitsdifferenz zwischen dem Laufradorgan 9 und dem Kühlfluid. Hierdurch wird eine strömungsgerichtete Führung des Kühlfluids vom Innenbereich des Motorrotors 22 in das Gehäuseteil 14 bewirkt, wodurch eine Ansammlung von Schmutzpartikeln wirksam vermieden wird. figure 3 shows a perspective view of the impeller element 9 and the outlet openings 33, which are designed here as bores and which are arranged in a circle offset by 120°. The outlet openings 33 have a tangential direction. Whose The central axis 34 encloses an angle α=65° with the axis of rotation 10 projected into the respective outlet opening 33 . This uses the outlet opening 33; by being oriented in the flow direction, the speed difference between the impeller member 9 and the cooling fluid. This causes the cooling fluid to be guided in a flow-oriented manner from the interior of the motor rotor 22 into the housing part 14, as a result of which an accumulation of dirt particles is effectively avoided.

Figur 4 zeigt nun in einer perspektivischen Ansicht die Innenseite des Laufradorgans 9 aus Figur 2. Durch die erfindungsgemäße Anordnung der Auslassbohrungen sammeln sich keine Schmutzpartikel mehr in einer Topfbiegung 40 des Laufradorgans 9 an. Bei einem Innendurchmesser des Laufradorgans 9 von 35mm besitzen die Auslassöffnungen 33 einen Durchmesser von 4mm und sind auf einer Kreisbahn mit einem Radius von 15,5mm angeordnet. figure 4 10 now shows the inside of the impeller element 9 in a perspective view figure 2 . Due to the arrangement of the outlet bores according to the invention, dirt particles no longer collect in a pot bend 40 of the impeller element 9 . With an inner diameter of the impeller element 9 of 35 mm, the outlet openings 33 have a diameter of 4 mm and are arranged on a circular path with a radius of 15.5 mm.

Claims (8)

  1. Electric motor vehicle coolant pump comprising a housing (4) with a pump unit (8) and with a motor unit (6), wherein the motor unit (6) comprises a motor rotor (22), which is supported in the housing (4) by bearing means (24), and comprises a motor stator (28), wherein the motor rotor (22) comprises an impeller member (9) and a drive member (20) having an axis of rotation (10), the drive member (20) extending in an axial direction, wherein blade elements (12) of the pump unit (8) are arranged on the impeller member (9), wherein inlet and outlet openings (30, 33) are provided in the pump unit (8), the inlet and outlet openings (30, 33) having respective central axes (34) and allowing a cooling fluid of the pump unit to flow through the motor unit (6), wherein the outlet openings (33) of the pump unit (8) are provided in the impeller member (9), wherein the outlet openings (33) are provided in the motor rotor (22), wherein central axes (34) of the outlet openings (33), viewed in an outlet direction, define an angle between α = 10° and α = 135° with a projection of the axis of rotation (10) into the respective outlet opening (33), characterized in that the outlet openings (33) extend substantially in a tangential direction with respect to the projected axis of rotation (10) of the impeller member (9).
  2. Electric motor vehicle coolant pump according to claim 1, characterized in that the angle α is between 45° to 65°.
  3. Electric motor vehicle coolant pump according to claim 1 to 2, characterized in that the outlet openings (33) are designed as boreholes which are arranged in a circular manner, uniformly offset in the circumferential direction.
  4. Electric motor vehicle coolant pump according to one of the preceding claims, characterized in that the motor rotor (22) is designed pot-shaped, wherein the drive member (20) is designed cylindrical.
  5. Electric motor vehicle coolant pump according to claim 4, characterized in that the motor rotor (22) is an external rotor.
  6. Electric motor vehicle coolant pump according to one of the preceding claims, characterized in that the outlet openings (33) are provided in the outermost region of the impeller member or, in the case of a pot-shaped design of the motor rotor (22), in the impeller member (9) or in the cylindrical drive member (20) in a transition region from the impeller member (9) to the drive member (20).
  7. Electric motor vehicle coolant pump according to one of the preceding claims, characterized in that the motor unit (6) is an electronically commutated electric motor.
  8. Electric motor vehicle coolant pump according to one of the claims 4 to 6, characterized in that the inlet opening (30) is provided as a ring-shaped gap between the housing (4) and the cylindrical drive member (20).
EP17768126.9A 2016-11-25 2017-09-18 Motor vehicle electric coolant pump Active EP3545196B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016122784.6A DE102016122784A1 (en) 2016-11-25 2016-11-25 Electric vehicle coolant pump
PCT/EP2017/073387 WO2018095607A1 (en) 2016-11-25 2017-09-18 Electric motor-vehicle coolant pump

Publications (2)

Publication Number Publication Date
EP3545196A1 EP3545196A1 (en) 2019-10-02
EP3545196B1 true EP3545196B1 (en) 2022-04-13

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EP17768126.9A Active EP3545196B1 (en) 2016-11-25 2017-09-18 Motor vehicle electric coolant pump

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US (1) US11162511B2 (en)
EP (1) EP3545196B1 (en)
CN (1) CN109983232B (en)
DE (1) DE102016122784A1 (en)
WO (1) WO2018095607A1 (en)

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Publication number Publication date
WO2018095607A1 (en) 2018-05-31
DE102016122784A1 (en) 2018-05-30
EP3545196A1 (en) 2019-10-02
CN109983232A (en) 2019-07-05
CN109983232B (en) 2021-12-14
US11162511B2 (en) 2021-11-02
US20190353166A1 (en) 2019-11-21

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