WO2022268269A1 - Bearing assembly for a pump motor - Google Patents

Bearing assembly for a pump motor Download PDF

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Publication number
WO2022268269A1
WO2022268269A1 PCT/DE2022/200111 DE2022200111W WO2022268269A1 WO 2022268269 A1 WO2022268269 A1 WO 2022268269A1 DE 2022200111 W DE2022200111 W DE 2022200111W WO 2022268269 A1 WO2022268269 A1 WO 2022268269A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
pump
rotor
arrangement according
motor
Prior art date
Application number
PCT/DE2022/200111
Other languages
German (de)
French (fr)
Inventor
Markus Baumann
Bertram Baudler
Jürgen Leykamm
Johann TRAUT
Jürgen Strüber
Thomas Peterreins
Original Assignee
Bühler Motor GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bühler Motor GmbH filed Critical Bühler Motor GmbH
Publication of WO2022268269A1 publication Critical patent/WO2022268269A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • 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
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F01C21/108—Stators; Members defining the outer boundaries of the working chamber with an axial surface, e.g. side plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • 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
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • 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
    • F04C2240/40—Electric motor
    • 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
    • F04C2240/51—Bearings for cantilever assemblies
    • 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
    • F04C2240/52—Bearings for assemblies with supports on both sides
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/10—Force connections, e.g. clamping
    • F16C2226/12—Force connections, e.g. clamping by press-fit, e.g. plug-in
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Definitions

  • the invention relates to a bearing arrangement for a pump motor according to the preamble of claim 1.
  • Pumps for conveying fluids have been used in the automotive sector for some time, in particular as water or oil pumps for a wide variety of applications in motor vehicles.
  • displacement pumps such as gerotor pumps can be used, in which a pump rotor device comprises two eccentrically rotating gears (inner and outer rotor), the medium being conveyed in the respective spaces between the rotors through the changed displacement space.
  • Such pumps include the pump as such as the main assembly, as well as an electric motor for driving the pump, separated from one another by at least one end shield.
  • the motor shaft and the pump shaft for driving the pump can form a coherent component, with this common shaft having bearings in order to absorb forces acting during operation, in particular radial forces.
  • a fixed bearing is usually provided on the drive side (so-called A-side) and a floating bearing is provided on the non-drive side (B-side), for example in the form of a ball bearing.
  • B-side non-drive side
  • the disadvantage of this, however, is that such a storage concept, including, in particular, a ball bearing, takes up a relatively large amount of space, which can cause problems in applications where installation space is limited. In this case, the assembly of such a device also entails greater effort.
  • the invention is therefore based on the object of specifying a bearing arrangement for a pump motor that is designed to save installation space and enables simple assembly.
  • a bearing arrangement for a pump motor comprising a pump housing, a pump head and at least one pump rotor, a motor housing arrangement with a stator and a rotor, which is arranged around a motor shaft (or a stator and a rotor are around the motor shaft arranged), and a bearing plate, which is arranged between the motor housing arrangement and the pump housing, with a fixed bearing being provided on the side of the motor housing arrangement in the bearing plate and a second bearing in the pump head for supporting the motor shaft.
  • the fixed bearing is designed as a ball bearing in the motor on the side of the motor housing arrangement.
  • the second bearing which supports the motor or the motor shaft, does not require any additional or separate installation space, since the second bearing is fully integrated into the pump motor.
  • the original B-side ball bearing is therefore no longer required.
  • the secondary bearing is provided for mounting the at least one pump rotor.
  • the pump rotor is designed as an outer rotor and/or inner rotor or comprises the outer rotor and/or the inner rotor.
  • the secondary bearing supports both the pump rotor and the motor shaft.
  • the second bearing is designed as a sliding bearing.
  • the secondary bearing can also comprise a slide bearing, for example several bearings connected to one another can be provided within the secondary bearing.
  • the secondary bearing comprises a first and/or a second bearing element.
  • the second bearing element is pressed into the first bearing element.
  • the second bearing element can also be inserted or glued into the first bearing element or fastened by another type known to those skilled in the art.
  • an outer surface of the first bearing element is in contact with the at least one pump rotor (for example on the inner surface of the pump rotor).
  • An inner surface of the second bearing member abuts the motor shaft.
  • the diameter of the first bearing element of the secondary bearing is larger than the diameter of the second bearing element of the secondary bearing.
  • This can also apply to an opening or a bore in the bearing element if the secondary bearing is designed as a bushing, for example.
  • the diameter of the opening or the bore of the first bearing element is larger than the diameter of the opening or the bore of the second bearing element of the secondary bearing.
  • the first and/or the second bearing element has an opening on one and/or on both end faces. However, the first and/or second bearing element can also be closed on an end face.
  • the secondary bearing has a first bearing surface and a second bearing surface.
  • the outer surface of the first bearing surface is in contact with the at least one pump rotor and the inner surface of the second bearing surface is in contact with the motor shaft.
  • a press fit is provided between the secondary bearing and the pump head.
  • the secondary bearing absorbs the radial forces of the pump due to the compression in the pump head. This means that only the weight of the motor shaft and no other forces act on the second bearing.
  • the second bearing as such, or in particular the first bearing element is designed as a stepped hollow cylinder. Due to the stepped design, the second bearing and the first bearing element fit more precisely on the pump head. That However, the second bearing as such, or in particular the first bearing element, can also have other forms of construction known to those skilled in the art.
  • the at least one pump rotor comprises an inner rotor and an outer rotor, and the inner rotor bears against the outer surface of the first bearing element.
  • the first bearing element consists of a bush, preferably made of a sintered material, preferably hardened sintered steel.
  • a bush preferably made of a sintered material, preferably hardened sintered steel.
  • the second bearing element consists of a bushing, preferably made of a sintered material, preferably sintered steel or sintered bronze and/or is preferably soaked or impregnated.
  • the second bearing element can also consist of other suitable materials known to those skilled in the art.
  • Dry running is made possible by soaking or impregnating the first and/or second bearing element.
  • the first and second bearing element can optionally be impregnated separately from one another or together.
  • the design of the second bearing from a first and a second bearing element enables a targeted selection of materials according to the application.
  • the pump is a displacement pump, preferably a gear pump, in particular a gerotor pump.
  • FIG. 2 shows a sectional illustration of a one-piece second bearing
  • FIG. 3 shows a sectional illustration of a two-part second bearing.
  • Fig. 1 shows a sectional view of a pump according to one embodiment, in the example a gerotor pump driven by an electric motor with a bearing arrangement (1) for a pump motor comprising a pump housing (2), a pump head (3) and at least one pump rotor (4), a Motor housing arrangement (5) with a stator (6) and a rotor (7) arranged around a motor shaft (8) and an end shield (9) arranged between the motor housing arrangement (5) and the pump housing (2).
  • a fixed bearing (10) is provided on the side of the motor housing arrangement (5) in the bearing plate (9) and a second bearing (11) is provided in the pump head (3) for supporting the motor shaft (8).
  • the secondary bearing (11) comprises a first bearing element (12) and a second bearing element (13) which are pressed into one another or otherwise fastened into one another.
  • the outer surface (14) of the first bearing element (12) bears on the at least one pump rotor (4) and the inner surface (15) of the second bearing element (13) bears on the motor shaft (8).
  • the second bearing (11) has a first bearing surface (18) and a second bearing surface (19).
  • the outer surface (20) of the first bearing surface (18) bears against the at least one pump rotor (4) and the inner surface (21) of the second bearing surface (19) bears against the motor shaft (8).
  • the at least one pump rotor (4) comprises an inner rotor (16) and an outer rotor (17), the inner rotor (16) bearing against the outer surface (14) of the first bearing element (12).
  • Fig. 2 shows a sectional view of an embodiment with a one-piece second bearing (11), which is pressed into a pump head (3) and is provided for mounting the at least one pump rotor (4).
  • the second bearing (11) rests with a first bearing surface (18) on the at least one pump rotor (4) and with a second bearing surface (19) on the motor shaft (8).
  • Fig. 3 shows a sectional view of a two-part second bearing (11), which is pressed into a pump head (3) and is provided for mounting the at least one pump rotor (4).
  • the second bearing (11) comprises a first and a second bearing element (12, 13), wherein the second bearing element (13) is pressed into the first bearing element (12).
  • An outer surface (14) of the first bearing element (12) bears against the at least one pump rotor (4) and an inner surface (15) of the second bearing element (13) bears on the motor shaft (8).

Abstract

The invention relates to a bearing assembly (1) for a pump motor, said bearing assembly comprising: a pump housing (2); a pump head (3) and at least one pump rotor (4); a motor housing assembly (5) having a stator (6) and a rotor (7), which are arranged around a motor shaft (8), as well as an end shield (9) which is located between the motor housing assembly (5) and the pump housing (2), a fixed bearing (10) being provided in the end shield (9) on the motor housing assembly (5) side and a secondary bearing (11) being provided in the pump head (3) for mounting the motor shaft (8).

Description

Titel: Lageranordnung für einen Pumpenmotor Title: Bearing Arrangement for a Pump Motor
BESCHREIBUNG DESCRIPTION
Die Erfindung betrifft eine Lageranordnung für einen Pumpenmotor gemäß dem Oberbegriff des Anspruchs 1. The invention relates to a bearing arrangement for a pump motor according to the preamble of claim 1.
Pumpen zur Förderung von Fluiden werden seit geraumer Zeit im Automobilbereich eingesetzt, insbesondere als Wasser- oder Ölpumpen für verschiedenste Anwendungszwecke in Kraftfahrzeugen. Beispielsweise können Verdrängerpumpen wie Gerotorpumpen zum Einsatz kommen, bei der eine Pumpenrotorvorrichtung zwei exzentrisch rotierende Zahnräder (Innen- und Außenrotor) umfasst, wobei das Medium in den jeweiligen Zwischenräumen der Rotoren durch den veränderten Verdrängungsraum gefördert wird. Derartige Pumpen umfassen als Hauptbaugruppen die Pumpe als solches, sowie einen Elektromotor zum Antrieb der Pumpe, voneinander getrennt durch mindestens ein Lagerschild. Pumps for conveying fluids have been used in the automotive sector for some time, in particular as water or oil pumps for a wide variety of applications in motor vehicles. For example, displacement pumps such as gerotor pumps can be used, in which a pump rotor device comprises two eccentrically rotating gears (inner and outer rotor), the medium being conveyed in the respective spaces between the rotors through the changed displacement space. Such pumps include the pump as such as the main assembly, as well as an electric motor for driving the pump, separated from one another by at least one end shield.
Die Motor- und die Pumpenwelle zum Antrieb der Pumpe können ein zusammenhängendes Bauteil bilden, wobei diese gemeinsame Welle Lager aufweist um beim Betrieb wirkende Kräfte, insbesondere Radialkräfte, aufzufangen. Üblicherweise ist ein Festlager auf Antriebsseite (sogenannte A-Seite) sowie ein Loslager auf der Nichtantriebsseite (B-Seite) vorgesehen, beispielsweise als Kugellager ausgebildet. Nachteilig hieran ist jedoch, dass ein derartiges Lagerkonzept, insbesondere ein Kugellager umfassend, relativ viel Platz in Anspruch nimmt, was bei Anwendungsfällen mit Bauraumbegrenzung Probleme verursachen kann. Auch zieht die Montage einer solchen Vorrichtung in diesem Fall höheren Aufwand mit sich. The motor shaft and the pump shaft for driving the pump can form a coherent component, with this common shaft having bearings in order to absorb forces acting during operation, in particular radial forces. A fixed bearing is usually provided on the drive side (so-called A-side) and a floating bearing is provided on the non-drive side (B-side), for example in the form of a ball bearing. The disadvantage of this, however, is that such a storage concept, including, in particular, a ball bearing, takes up a relatively large amount of space, which can cause problems in applications where installation space is limited. In this case, the assembly of such a device also entails greater effort.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Lageranordnung für einen Pumpenmotor anzugeben, die bauraumsparend ausgebildet ist sowie eine einfache Montage ermöglicht. The invention is therefore based on the object of specifying a bearing arrangement for a pump motor that is designed to save installation space and enables simple assembly.
Erfindungsgemäß wird diese Aufgabe durch den Gegenstand des Anspruchs 1 gelöst.According to the invention, this object is achieved by the subject matter of claim 1.
Es wird eine Lageranordnung für einen Pumpenmotor vorgeschlagen, umfassend ein Pumpengehäuse, einen Pumpenkopf und mindestens einen Pumpenrotor, eine Motorgehäuseanordnung, mit einem Stator und einem Rotor, die um eine Motorwelle herum angeordnet ist (bzw. ein Stator und ein Rotor sind um die Motorwelle herum angeordnet), sowie einem Lagerschild, das zwischen der Motorgehäuseanordnung und dem Pumpengehäuse angeordnet ist, wobei ein Festlager auf Seiten der Motorgehäuseanordnung im Lagerschild und ein Zweitlager im Pumpenkopf zur Lagerung der Motorwelle vorgesehen sind. Das Festlager ist auf Seiten der Motorgehäuseanordnung als Kugellager im Motor ausgebildet. A bearing arrangement for a pump motor is proposed, comprising a pump housing, a pump head and at least one pump rotor, a motor housing arrangement with a stator and a rotor, which is arranged around a motor shaft (or a stator and a rotor are around the motor shaft arranged), and a bearing plate, which is arranged between the motor housing arrangement and the pump housing, with a fixed bearing being provided on the side of the motor housing arrangement in the bearing plate and a second bearing in the pump head for supporting the motor shaft. The fixed bearing is designed as a ball bearing in the motor on the side of the motor housing arrangement.
Vorteilhaft ist, dass das Zweitlager, das den Motor, bzw. die Motorwelle lagert, keinen zusätzlichen bzw. separaten Bauraum benötigt, da das Zweitlager vollständig in den Pumpenmotor integriert ist. Das ursprünglich B-seitige Kugellager entfällt folglich. It is advantageous that the second bearing, which supports the motor or the motor shaft, does not require any additional or separate installation space, since the second bearing is fully integrated into the pump motor. The original B-side ball bearing is therefore no longer required.
Gemäß einer vorteilhaften Ausbildung ist das Zweitlager zur Lagerung des mindestens einen Pumpenrotors vorgesehen. Der Pumpenrotor ist hierbei als ein Außenrotor und/oder Innenrotor ausgebildet oder umfasst den Außenrotor und/oder den Innenrotor. Das Zweitlager lagert hierbei sowohl den Pumpenrotor als auch die Welle des Motors. According to an advantageous embodiment, the secondary bearing is provided for mounting the at least one pump rotor. In this case, the pump rotor is designed as an outer rotor and/or inner rotor or comprises the outer rotor and/or the inner rotor. The secondary bearing supports both the pump rotor and the motor shaft.
In einer weiteren vorteilhaften Ausbildung ist das Zweitlager als Gleitlager ausgebildet. Das Zweitlager kann aber auch ein Gleitlager umfassen, beispielsweise können mehrere miteinander verbundene Lager innerhalb des Zweitlagers vorgesehen sein. In a further advantageous embodiment, the second bearing is designed as a sliding bearing. However, the secondary bearing can also comprise a slide bearing, for example several bearings connected to one another can be provided within the secondary bearing.
Gemäß einer weiteren vorteilhaften Ausbildung umfasst das Zweitlager ein erstes und/oder ein zweitens Lagerelement. In einer weiteren vorteilhaften Ausbildung ist das zweite Lagerelement in das erste Lagerelement eingepresst. Alternativ kann das zweite Lagerelement auch in das erste Lagerelement eingelegt oder eingeklebt sein oder durch eine andere dem Fachmann bekannte Art befestigt sein. According to a further advantageous embodiment, the secondary bearing comprises a first and/or a second bearing element. In a further advantageous embodiment, the second bearing element is pressed into the first bearing element. Alternatively, the second bearing element can also be inserted or glued into the first bearing element or fastened by another type known to those skilled in the art.
Gemäß einer weiteren vorteilhaften Ausbildung liegt eine Außenfläche des ersten Lagerelements an dem mindestens einen Pumpenrotor an (beispielsweise an der Innenfläche des Pumpenrotors). Eine Innenfläche des zweiten Lagerelements liegt an der Motorwelle an. Der Durchmesser des ersten Lagerelements des Zweitlagers ist größer als der Durchmesser des zweiten Lagerelements des Zweitlagers. Dies kann auch für eine Öffnung oder eine Bohrung im Lagerelement zutreffen, im Fall, dass das Zweitlager beispielsweise als eine Buchse ausgebildet ist. In diesem Fall ist der Durchmesser der Öffnung oder der Bohrung des ersten Lagerelements größer als der Durchmesser der Öffnung oder der Bohrung des zweiten Lagerelements des Zweitlagers. Zudem weisen das erste und/oder das zweite Lagerelement an einer und/oder an beiden Stirnflächen eine Öffnung auf. Das erste und/oder zweite Lagerelement kann aber auch an einer Stirnfläche geschlossen sein. According to a further advantageous embodiment, an outer surface of the first bearing element is in contact with the at least one pump rotor (for example on the inner surface of the pump rotor). An inner surface of the second bearing member abuts the motor shaft. The diameter of the first bearing element of the secondary bearing is larger than the diameter of the second bearing element of the secondary bearing. This can also apply to an opening or a bore in the bearing element if the secondary bearing is designed as a bushing, for example. In this case, the diameter of the opening or the bore of the first bearing element is larger than the diameter of the opening or the bore of the second bearing element of the secondary bearing. In addition, the first and/or the second bearing element has an opening on one and/or on both end faces. However, the first and/or second bearing element can also be closed on an end face.
In einer weiteren vorteilhaften Ausbildung weist das Zweitlager eine erste Lagerfläche und eine zweite Lagerfläche auf. In a further advantageous embodiment, the secondary bearing has a first bearing surface and a second bearing surface.
Gemäß einer weiteren vorteilhaften Ausbildung liegt die Außenfläche der ersten Lagerfläche an dem mindestens einen Pumpenrotor an und die Innenfläche der zweiten Lagerfläche liegt an der Motorwelle an. According to a further advantageous embodiment, the outer surface of the first bearing surface is in contact with the at least one pump rotor and the inner surface of the second bearing surface is in contact with the motor shaft.
In einer weiteren vorteilhaften Ausbildung ist zwischen dem Zweitlager und dem Pumpenkopf eine Presspassung vorgesehen. Das Zweitlager nimmt durch die Verpressung in den Pumpenkopf Radialkräfte der Pumpe auf. Somit wirken auf das Zweitlager lediglich nur die Gewichtskraft der Motorwelle und keine weiteren Kräfte. In a further advantageous embodiment, a press fit is provided between the secondary bearing and the pump head. The secondary bearing absorbs the radial forces of the pump due to the compression in the pump head. This means that only the weight of the motor shaft and no other forces act on the second bearing.
Das Zweitlager als solches, bzw. insbesondere das erste Lagerelement sind als stufenförmiger Hohlzylinder ausgebildet. Durch die stufenförmige Ausbildung liegt das Zweitlager als auch das erste Lagerelement passgenauer am Pumpenkopf an. Das Zweitlager als solches, bzw. insbesondere das erste Lagerelemente können aber auch andere dem Fachmann bekannte Ausbildungsformen aufweisen. The second bearing as such, or in particular the first bearing element, is designed as a stepped hollow cylinder. Due to the stepped design, the second bearing and the first bearing element fit more precisely on the pump head. That However, the second bearing as such, or in particular the first bearing element, can also have other forms of construction known to those skilled in the art.
Gemäß einer weiteren vorteilhaften Ausbildung umfasst der mindestens eine Pumpenrotor einen Innenrotor und einen Außenrotor und der Innenrotor liegt an der Außenfläche des ersten Lagerelements an. According to a further advantageous embodiment, the at least one pump rotor comprises an inner rotor and an outer rotor, and the inner rotor bears against the outer surface of the first bearing element.
In einer weiteren vorteilhaften Ausbildung besteht das erste Lagerelement aus einer Buchse vorzugsweise aus einem Sintermaterial, bevorzugt aus gehärtetem Sinterstahl. Durch die Verwendung eines gehärteten Sinterstahls für das erste Lagerelement, wird eine Verformung des ersten Lagerelements beim Einpressen in den Pumpenkopf vermieden. Das erste Lagerelement kann aber auch aus anderen geeigneten und dem Fachmann bekannten Materialien bestehen. In a further advantageous embodiment, the first bearing element consists of a bush, preferably made of a sintered material, preferably hardened sintered steel. By using hardened sintered steel for the first bearing element, deformation of the first bearing element when it is pressed into the pump head is avoided. However, the first bearing element can also consist of other suitable materials known to those skilled in the art.
Gemäß einer weiteren vorteilhaften Ausbildung besteht das zweite Lagerelement aus einer Buchse vorzugsweise aus einem Sintermaterial, bevorzugt aus Sinterstahl oder Sinterbronze und/oder ist vorzugsweise getränkt oder imprägniert. Das zweite Lagerelement kann aber auch aus anderen geeigneten und dem Fachmann bekannten Materialien bestehen. According to a further advantageous embodiment, the second bearing element consists of a bushing, preferably made of a sintered material, preferably sintered steel or sintered bronze and/or is preferably soaked or impregnated. However, the second bearing element can also consist of other suitable materials known to those skilled in the art.
Durch die Tränkung oder Imprägnierung des ersten und/oder zweiten Lagerelements wird ein Trockenlauf ermöglicht. Das erste und zweite Lagerelement können wahlweise getrennt voneinander oder zusammen imprägniert werden. Dry running is made possible by soaking or impregnating the first and/or second bearing element. The first and second bearing element can optionally be impregnated separately from one another or together.
Die Ausgestaltung des Zweitlagers aus einem ersten und einem zweiten Lagerelement ermöglicht eine gezielte Materialauswahl entsprechend dem Anwendungsfall. The design of the second bearing from a first and a second bearing element enables a targeted selection of materials according to the application.
In einer weiteren vorteilhaften Ausbildung ist die Pumpe eine Verdrängerpumpe, vorzugsweise eine Zahnradpumpe, insbesondere eine Gerotorpumpe. In a further advantageous embodiment, the pump is a displacement pump, preferably a gear pump, in particular a gerotor pump.
Die Erfindung wird im Folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die beigefügten Zeichnungen näher erläutert. Es zeigen: Fig. 1 eine Schnittansicht der erfindungsgemäßen Pumpe, The invention is explained in more detail below using exemplary embodiments with reference to the accompanying drawings. Show it: 1 shows a sectional view of the pump according to the invention,
Fig. 2 eine Schnittdarstellung eines einteiligen Zweitlagers; und Fig. 3 eine Schnittdarstellung eines zweiteiligen Zweitlagers. 2 shows a sectional illustration of a one-piece second bearing; and FIG. 3 shows a sectional illustration of a two-part second bearing.
Fig. 1 zeigt eine Schnittansicht einer Pumpe gemäß einer Ausführungsform, im Beispiel eine mittels eines Elektromotors angetriebene Gerotorpumpe mit einer Lageranordnung (1) für einen Pumpenmotor umfassend ein Pumpengehäuse (2), einen Pumpenkopf (3) und mindestens einen Pumpenrotor (4), einer Motorgehäuseanordnung (5), mit einem Stator (6) und einem Rotor (7), die um eine Motorwelle (8) herum angeordnet ist, sowie einem Lagerschild (9), das zwischen der Motorgehäuseanordnung (5) und dem Pumpengehäuse (2) angeordnet ist, wobei ein Festlager (10) auf Seiten der Motorgehäuseanordnung (5) im Lagerschild (9) und ein Zweitlager (11) im Pumpenkopf (3) zur Lagerung der Motorwelle (8) vorgesehen sind. Das Zweitlager (11) umfasst ein erstes Lagerelement (12) und ein zweites Lagerelement (13), die ineinander gepresst oder anderweitig ineinander befestigt sind. Die Außenfläche (14) des ersten Lagerelements (12) liegt an dem mindestens einen Pumpenrotor (4) an und die Innenfläche (15) des zweiten Lagerelements (13) liegt an der Motorwelle (8) an. Das Zweitlager (11) weist eine erste Lagerfläche (18) und eine zweite Lagerfläche (19) auf. Die Außenfläche (20) der ersten Lagerfläche (18) liegt an dem mindestens einen Pumpenrotor (4) an und die Innenfläche (21) der zweiten Lagerfläche (19) liegt an der Motorwelle (8) an. Der mindestens eine Pumpenrotor (4) umfasst einen Innenrotor (16) und einen Außenrotor (17), wobei der Innenrotor (16) an der Außenfläche (14) des ersten Lagerelements (12) anliegt. Fig. 1 shows a sectional view of a pump according to one embodiment, in the example a gerotor pump driven by an electric motor with a bearing arrangement (1) for a pump motor comprising a pump housing (2), a pump head (3) and at least one pump rotor (4), a Motor housing arrangement (5) with a stator (6) and a rotor (7) arranged around a motor shaft (8) and an end shield (9) arranged between the motor housing arrangement (5) and the pump housing (2). A fixed bearing (10) is provided on the side of the motor housing arrangement (5) in the bearing plate (9) and a second bearing (11) is provided in the pump head (3) for supporting the motor shaft (8). The secondary bearing (11) comprises a first bearing element (12) and a second bearing element (13) which are pressed into one another or otherwise fastened into one another. The outer surface (14) of the first bearing element (12) bears on the at least one pump rotor (4) and the inner surface (15) of the second bearing element (13) bears on the motor shaft (8). The second bearing (11) has a first bearing surface (18) and a second bearing surface (19). The outer surface (20) of the first bearing surface (18) bears against the at least one pump rotor (4) and the inner surface (21) of the second bearing surface (19) bears against the motor shaft (8). The at least one pump rotor (4) comprises an inner rotor (16) and an outer rotor (17), the inner rotor (16) bearing against the outer surface (14) of the first bearing element (12).
Fig. 2 zeigt eine Schnittdarstellung eines Ausführungsbeispiels mit einem einteiligen Zweitlager (11), das in einen Pumpenkopf (3) eingepresst ist und zur Lagerung des mindestens einen Pumpenrotors (4) vorgesehen ist. Das Zweitlager (11) liegt dabei mit einer ersten Lagerfläche (18) an dem mindestens einen Pumpenrotor (4) und mit einer zweiten Lagerfläche (19) an der Motorwelle (8) an. Fig. 2 shows a sectional view of an embodiment with a one-piece second bearing (11), which is pressed into a pump head (3) and is provided for mounting the at least one pump rotor (4). The second bearing (11) rests with a first bearing surface (18) on the at least one pump rotor (4) and with a second bearing surface (19) on the motor shaft (8).
Fig. 3 zeigt eine Schnittdarstellung eines zweiteiligen Zweitlagers (11), das in einen Pumpenkopf (3) eingepresst und zur Lagerung des mindestens einen Pumpenrotors (4) vorgesehen ist. Das Zweitlager (11) umfasst ein erstes und ein zweites Lagerelement (12, 13), wobei das zweite Lagerelement (13) in das erste Lagerelement (12) eingepresst ist. Eine Außenfläche (14) des ersten Lagerelements (12) liegt an den mindestens einen Pumpenrotor (4) an und eine Innenfläche (15) des zweiten Lagerelements (13) liegt an der Motorwelle (8) an. Fig. 3 shows a sectional view of a two-part second bearing (11), which is pressed into a pump head (3) and is provided for mounting the at least one pump rotor (4). The second bearing (11) comprises a first and a second bearing element (12, 13), wherein the second bearing element (13) is pressed into the first bearing element (12). An outer surface (14) of the first bearing element (12) bears against the at least one pump rotor (4) and an inner surface (15) of the second bearing element (13) bears on the motor shaft (8).
Bezugszeichenliste Reference List
1 Lageranordnung 1 bearing arrangement
2 Pumpengehäuse 2 pump housing
3 Pumpenkopf 3 pump head
4 Pumpenrotor 4 pump rotor
5 Motorgehäuseanordnung 5 engine case assembly
6 Stator 6 stator
7 Rotor 7 rotors
8 Motorwelle 8 motor shaft
9 Lagerschild 9 end shield
10 Festlager 10 fixed bearings
11 Zweitlager 11 secondary storage
12 Erstes Lagerelement 12 First bearing element
13 Zweites Lagerelement 13 Second bearing element
14 Außenfläche erstes Lagerelement 14 Outer surface of first bearing element
15 Innenfläche zweites Lagerelement 15 inner surface of the second bearing element
16 Innenrotor 16 inner rotor
17 Außenrotor 17 outer rotor
18 Erste Lagerfläche 18 First storage area
19 Zweite Lagerfläche 19 Second storage area
20 Außenfläche erste Lagerfläche 20 outer surface first storage area
21 Innenfläche zweite Lagerfläche 21 inner surface second bearing surface

Claims

PATENTANSPRÜCHE PATENT CLAIMS
1. Lageranordnung (1) für einen Pumpenmotor umfassend ein Pumpengehäuse (2), einen Pumpenkopf (3) und mindestens einen Pumpenrotor (4), einer Motorgehäuseanordnung (5), mit einem Stator (6) und einem Rotor (7), die um eine Motorwelle (8) herum angeordnet ist, sowie einem Lagerschild (9), das zwischen der Motorgehäuseanordnung (5) und dem Pumpengehäuse (2) angeordnet ist, wobei ein Festlager (10) auf Seiten der Motorgehäuseanordnung (5) im Lagerschild (9) und ein Zweitlager (11) im Pumpenkopf (3) zur Lagerung der Motorwelle (8) vorgesehen sind. 1. Bearing assembly (1) for a pump motor comprising a pump housing (2), a pump head (3) and at least one pump rotor (4), a motor housing assembly (5), with a stator (6) and a rotor (7) around a motor shaft (8) is arranged around it, and an end shield (9) which is arranged between the motor housing arrangement (5) and the pump housing (2), a fixed bearing (10) on the side of the motor housing arrangement (5) in the end shield (9) and a second bearing (11) is provided in the pump head (3) for supporting the motor shaft (8).
2. Lageranordnung nach Anspruch 1, wobei das Zweitlager (11) zur Lagerung des mindestens einen Pumpenrotors (4) vorgesehen ist. 2. Bearing arrangement according to claim 1, wherein the second bearing (11) is provided for supporting the at least one pump rotor (4).
3. Lageranordnung nach Anspruch 1 oder 2, wobei das Zweitlager (11) als Gleitlager ausgebildet ist. 3. Bearing arrangement according to claim 1 or 2, wherein the second bearing (11) is designed as a plain bearing.
4. Lageranordnung nach einem der vorherigen Ansprüche, wobei das Zweitlager (11) ein erstes und/oder ein zweitens Lagerelement (12, 13) umfasst. 4. Bearing arrangement according to one of the preceding claims, wherein the second bearing (11) comprises a first and / or a second bearing element (12, 13).
5. Lageranordnung nach Anspruch 4, wobei das zweite Lagerelement (13) in das erste Lagerelement (12) eingepresst ist. 5. Bearing arrangement according to claim 4, wherein the second bearing element (13) is pressed into the first bearing element (12).
6. Lageranordnung nach Anspruch 4 oder 5, wobei eine Außenfläche (14) des ersten Lagerelements (12) an dem mindestens einen Pumpenrotor (4) anliegt und wobei eine Innenfläche (15) des zweiten Lagerelements (13) an der Motorwelle (8) anliegt. 6. Bearing arrangement according to claim 4 or 5, wherein an outer surface (14) of the first bearing element (12) bears against the at least one pump rotor (4) and wherein an inner surface (15) of the second bearing element (13) bears on the motor shaft (8). .
7. Lageranordnung nach einem der Ansprüche 1 bis 3, wobei das Zweitlager (11) eine erste Lagerfläche (18) und eine zweite Lagerfläche (19) aufweist. 7. Bearing arrangement according to one of claims 1 to 3, wherein the second bearing (11) has a first bearing surface (18) and a second bearing surface (19).
8. Lageranordnung nach Anspruch 7, wobei eine Außenfläche (20) der ersten Lagerfläche (18) an dem mindestens einen Pumpenrotor (4) anliegt und wobei eine Innenfläche (21) der zweiten Lagerfläche (19) an der Motorwelle (8) anliegt. 8. Bearing arrangement according to claim 7, wherein an outer surface (20) of the first bearing surface (18) abuts the at least one pump rotor (4) and wherein an inner surface (21) of the second bearing surface (19) abuts the motor shaft (8).
9. Lageranordnung nach einem der vorherigen Ansprüche, wobei zwischen dem Zweitlager (11) und dem Pumpenkopf (3) eine Presspassung vorgesehen ist. 9. Bearing arrangement according to one of the preceding claims, wherein a press fit is provided between the second bearing (11) and the pump head (3).
10. Lageranordnung nach einem der vorherigen Ansprüche, wobei der mindestens eine Pumpenrotor (4) einen Innenrotor (16) und einen Außenrotor (17) umfasst und wobei der Innenrotor (16) an der Außenfläche (14) des ersten Lagerelements (12) anliegt. 10. Bearing arrangement according to one of the preceding claims, wherein the at least one pump rotor (4) comprises an inner rotor (16) and an outer rotor (17) and wherein the inner rotor (16) bears against the outer surface (14) of the first bearing element (12).
11. Lageranordnung nach einem der vorherigen Ansprüche, wobei das erste Lagerelement (12) aus einer Buchse aus vorzugsweise einem Sintermaterial, bevorzugt aus gehärtetem Sinterstahl besteht und wobei das zweite Lagerelement (13) aus einer Buchse aus vorzugsweise einem Sintermaterial besteht, bevorzugt aus Sinterstahl oder Sinterbronze und/oder vorzugsweise getränkt oder imprägniert ist. 11. Bearing arrangement according to one of the preceding claims, wherein the first bearing element (12) consists of a bushing preferably made of a sintered material, preferably hardened sintered steel, and the second bearing element (13) consists of a bushing preferably made of a sintered material, preferably sintered steel or Sintered bronze and / or preferably soaked or impregnated.
12. Pumpe mit einer Lageranordnung gemäß der vorherigen Ansprüche, wobei die Pumpe eine Verdrängerpumpe, vorzugsweise eine Zahnradpumpe, insbesondere eine Gerotorpumpe ist. 12. Pump with a bearing arrangement according to the preceding claims, wherein the pump is a positive displacement pump, preferably a gear pump, in particular a gerotor pump.
PCT/DE2022/200111 2021-06-25 2022-06-09 Bearing assembly for a pump motor WO2022268269A1 (en)

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