EP3380733B1 - Zahnradpumpe - Google Patents

Zahnradpumpe Download PDF

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Publication number
EP3380733B1
EP3380733B1 EP16800919.9A EP16800919A EP3380733B1 EP 3380733 B1 EP3380733 B1 EP 3380733B1 EP 16800919 A EP16800919 A EP 16800919A EP 3380733 B1 EP3380733 B1 EP 3380733B1
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EP
European Patent Office
Prior art keywords
bush
stator unit
cavity
gear pump
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16800919.9A
Other languages
English (en)
French (fr)
Other versions
EP3380733A1 (de
Inventor
Nello Medoro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3380733A1 publication Critical patent/EP3380733A1/de
Application granted granted Critical
Publication of EP3380733B1 publication Critical patent/EP3380733B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F04C15/008—Prime movers
    • 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
    • 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
    • F04C2210/00—Fluid
    • F04C2210/20—Fluid liquid, i.e. incompressible
    • F04C2210/203—Fuel
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F04C2230/23—Manufacture essentially without removing material by permanently joining parts together
    • 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
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • 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

Definitions

  • the present invention relates to a gear pump for pumping liquids.
  • the present invention relates to an electrically operated gear pump which can advantageously be used to feed fuel to an internal combustion engine. This is a use to which the text which follows will make explicit reference, without thereby losing generality.
  • a number of models of electrically operated gear pumps for liquids comprise: an annular stator unit capable of generating a rotating magnetic field; a ring gear with inner toothing, which is inserted/fitted in an axially rotatable manner on the inside of the stator unit; and finally a gear wheel, which is fitted in an axially rotatable manner on a support pin positioned eccentrically on the inside of the ring gear and meshes on the inner toothing of the ring gear.
  • the rotation of the ring gear on the inside of the stator unit creates a movable volume that is capable of transferring a predetermined quantity of fuel or other liquid from the intake port of the pump to the delivery port of said pump.
  • the flow of the liquid exiting the pump obviously depends on the speed of rotation of the ring gear.
  • the gear pump is finally also equipped with a tubular bush, which is interposed between the outer surface of the ring gear and the inner surface of the stator unit in such a way as to reduce the wear of the two components and at the same time facilitate the insertion of the two gears into the stator unit.
  • the tubular bush is generally fixed immovably on the inside of the stator unit by means of the adhesive which is injected into the interstitial space between the bush and the stator unit.
  • the mechanical play present between the bush and the stator unit is reduced to such an extent as to make it extremely difficult for the adhesive to penetrate between the two components, and therefore the adhesive is injected into the interstitial space between the bush and the stator unit by means of particularly complicated and expensive machinery.
  • DE 10 2009 028 148 A1 discloses a gear pump according to the preamble of claim 1.
  • the present invention provides a gear pump as defined in Claim 1 and preferably, but not necessarily, in any one of the claims dependent thereon.
  • the present invention also provides a method for assembling a gear pump as defined in Claim 9 and preferably, but not necessarily, in any one of the claims dependent thereon.
  • the numeral 1 denotes, in its entirety, an electrically operated gear pump for pumping liquids, which can advantageously be used to feed fuel to an internal combustion engine.
  • the gear pump 1 comprises essentially: a stator unit 2, which is equipped internally with a substantially cylindrical cavity 3 and is structured in such a way as to be able to generate a magnetic field rotating on the inside of the cavity 3; a substantially tubular, cylindrical bush 4, which is keyed/inserted on the inside of the cavity 3 immovably and preferably also in such a way as to rest substantially uniformly on the inner surface of the stator unit 2; and at least one pumping gear housed in an axially rotatable manner on the inside of the bush.
  • the gear pump 1 is preferably equipped with a pair of pumping gears 5 and 6, which are housed in an axially rotatable manner on the inside of the tubular bush 4 and at the same time mesh into one another.
  • the bush 4 is preferably formed by a tubular cylindrical body preferably made of a plastic material.
  • the thickness of the tubular body 4 is preferably furthermore between 0.1 and 3 mm (millimetres).
  • the stator unit 2 comprises a plurality of polar cores 8, which are preferably made of a magnetic material, are evenly spaced angularly about the longitudinal axis A of the cavity 3, and are equipped with polar heads 9, which face the cavity 3 and contribute to delimiting/defining the perimeter of the cavity 3; and the outer surface of the tubular bush 4 rests directly on the polar heads 9 of the various polar cores 8.
  • each polar core 8 is preferably formed by a stack of laminations, which are placed closely next to one another and are preferably made of a ferromagnetic material.
  • stator unit 2 further also comprises a preferably substantially cylindrical outer tubular jacket 10, which is preferably made of a metallic material and extends coaxially with the longitudinal axis A in such a way as to surround the polar cores 8 of the stator unit 2 and the bush 4.
  • a substantially cylindrical outer tubular jacket 10 which is preferably made of a metallic material and extends coaxially with the longitudinal axis A in such a way as to surround the polar cores 8 of the stator unit 2 and the bush 4.
  • each polar core 8 further forms a link and/or extends in a cantilevered manner from the tubular jacket 10 towards the bush 4 positioned in the centre of said tubular jacket 10.
  • the tubular jacket 10 is also preferably formed by a stack of laminations, which are placed closely next to one another and are preferably made of a ferromagnetic material, and the polar cores 8 are preferably formed in one piece with the tubular jacket 10.
  • the metallic laminations which form the outer tubular jacket 10 are cut in such a way as to also form the polar cores 8.
  • the stator unit 2 further also comprises a series of induction coils 11, which are wound around the various polar cores 8 in such a way as to be able to generate, when electric current passes through them, a radial magnetic field on the inside of the cavity 3.
  • a series of induction coils 11 of the stator unit 2 By energizing the induction coils 11 of the stator unit 2 in a known manner, it is possible to generate, on the inside of the cavity 3 and of the tubular bush 4, a radial magnetic field which rotates about the longitudinal axis A of the cavity 3 and is capable of driving at least one of the pumping gears 5 and 6 to rotate.
  • the groove or grooves for supplying the adhesive 12 is or are preferably also substantially rectilinear and/or locally parallel with one another, and optionally also parallel to the longitudinal axis A of the cavity 3 and of the bush 4.
  • the zone of contact between the tubular bush 4 and the stator unit 2, or more precisely between the tubular bush 4 and at least one of the polar heads 9 of the stator unit 2, is preferably provided with a plurality of grooves for supplying the adhesive 12 which are arranged one alongside another.
  • the groove or grooves for supplying the adhesive 12 is or are preferably formed directly on the polar head 9.
  • the groove or grooves for supplying the adhesive 12 extends or extend along the cylindrical surface of the polar head 9, preferably remaining parallel to the longitudinal axis A and preferably over the entire axial length f of the polar head 9.
  • the groove or grooves for supplying the adhesive 12 is or are preferably formed by appropriately cutting/severing the laminations which contribute to forming the polar core 8.
  • each one of the polar heads 9 of the stator unit 2 is preferably equipped with a plurality of grooves for supplying the adhesive 12, which extend on the cylindrical surface of the polar head 9 one alongside another, over the entire axial length f of the polar head 9, and are dimensioned in such a way as to conduct/allow the flow of the adhesive needed to permanently fix the tubular bush 4 to the stator unit 2 rapidly inside the interstitial space between the tubular bush 4 and the stator unit 2.
  • the grooves for supplying the adhesive 12 are also spaced apart in a substantially uniform manner along the entire width of the polar head 9.
  • the pair of pumping gears on the other hand, to comprise: a circular ring gear 5, which has the toothing on its inside, i.e. facing towards the centre, and is housed in an axially rotatable manner on the inside of the bush 4, coaxially with the longitudinal axis A of the cavity 3 and of the bush 4; and a gear wheel 6, which is fitted in an axially rotatable manner on a support pin 13 positioned eccentrically on the inside of the ring gear 5 and meshes on the inner toothing of the ring gear 5.
  • the ring gear 5 is preferably made of a plastic material or of a sintered metallic material and preferably internally incorporates a series of permanent magnets (not shown), which interact with the rotating magnetic field generated by the stator unit 2, producing a torque which drives the ring gear 5 to rotate about the longitudinal axis A.
  • the ring gear 5 may have a series of cavities, which locally attenuate the magnetic flux and interact with the rotating magnetic field generated by the stator unit 2, producing a torque which drives the ring gear 5 to rotate about the longitudinal axis A.
  • the ring gear 5 may also internally incorporate a series of elements made of an electrically conductive material which are arranged in such a way as to form a squirrel cage.
  • the gear wheel 6 is also preferably made of a plastic material or of a sintered metallic material.
  • the gear pump 1 is finally provided with an outer casing 14, which is equipped on the inside with a structured/shaped cavity for accommodating the stator unit 2, the tubular bush 4 and the two pumping gears 5 and 6 and at the same time closing the two axial ends of the cavity 3, preferably in a fluid-tight manner.
  • the support pin 13 of the gear wheel 6 is preferably furthermore fixed firmly on the outer casing 14.
  • the outer casing 14 preferably comprises: a substantially cylindrical cup-shaped body 15, which is dimensioned so as to be able to accommodate, resting on the bottom thereof, the stator unit 2, the tubular bush 4 and the two pumping gears 5 and 6; and a disc-shaped cover (not shown) positioned so as to close the opening of the cup-shaped body 15, in such a way as to plug the second axial end of the cavity 3.
  • the support pin 13 preferably further extends in a cantilevered manner from the bottom of the cup-shaped body 15, and is preferably formed in one piece with the latter.
  • gear pump 1 The operation of the gear pump 1 can easily be inferred from that described above and does not need to be explained further.
  • the method for mounting the gear pump 1 provides for inserting the tubular bush 4 into the cavity 3 of the stator unit 2, and then injecting directly into the longitudinal grooves 12 the adhesive needed to immovably fix/block the tubular bush 4 on the polar heads 9 of the stator unit 2.
  • the method for assembling the gear pump 1 moreover provides for inserting at least one of the two pumping gears 5, 6 into the bush 4, before inserting the bush 4 into the cavity 3 of the stator unit 2.
  • the method for assembling the gear pump 1 preferably provides for inserting at least the ring gear 5 into the bush 4, before inserting the bush 4 into the cavity 3 of the stator unit 2.
  • the presence of the longitudinal grooves 12 offers a number of advantages.
  • the longitudinal grooves 12 make it possible to inject the adhesive more quickly into the interstitial space between the tubular bush 4 and the stator unit 2, speeding up the production process.
  • longitudinal grooves 12 make it possible to distribute the adhesive with greater homogeneity in the interstitial space between the tubular bush 4 and the stator unit 2, with all the advantages this involves.
  • the tubular bush 4 could be made of bronze and/or the groove or grooves for supplying the adhesive 12 could extend on the cylindrical surface of the polar head 9, following a preferably substantially helical curved trajectory.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Claims (10)

  1. Zahnradpumpe (1) zum Pumpen von Flüssigkeiten der Art, die Folgendes umfasst:
    eine Statoreinheit (2), die mit einem im Wesentlichen zylindrischen Hohlraum (3) ausgestattet ist und dazu ausgestaltet ist ein Magnetfeld zu erzeugen, das sich innerhalb des Hohlraums (3) dreht;
    eine im Wesentlichen rohrförmige, zylindrische Buchse (4), die innerhalb des Hohlraums (3) der Statoreinheit (2) formschlüssig angeordnet ist; und
    mindestens ein Pumpenzahnrad (5, 6), das axial drehbar innerhalb der Buchse (4) aufgenommen ist;
    wobei die Zahnradpumpe (1) dadurch gekennzeichnet ist, dass eine oder mehrere Längsnuten (12) in der Kontaktzone zwischen der Statoreinheit (2) und der Buchse (4) vorhanden sind, wobei sich die Längsnuten in den Zwischenraum zwischen der Buchse (4) und der Statoreinheit (2) erstrecken und dazu ausgestaltet sind, einen Klebstoff in den Zwischenraum zwischen der Buchse (4) und der Statoreinheit (2) zu leiten.
  2. Zahnradpumpe nach Anspruch 1, wobei (1) sich die Längsnut oder -nuten (12) innerhalb des Zwischenraums zwischen der Buchse (4) und der Statoreinheit (2) im Wesentlichen über die gesamte Axiallänge (l) der Kontaktzone erstreckt/erstrecken.
  3. Zahnradpumpe nach Anspruch 1 oder 2, wobei die Längsnut oder -nuten (12) im Wesentlichen geradlinig ist/sind.
  4. Zahnradpumpe nach Anspruch 1 oder 2, wobei die Längsnut oder -nuten (12) einer im Wesentlichen spiralförmig gekrümmten Bahn folgt/folgen.
  5. Zahnradpumpe nach einem der vorstehenden Ansprüche, wobei die Kontaktzone zwischen der Statoreinheit (2) und der Buchse (4) mit mehreren nebeneinander angeordneten Längsnuten (12) versehen ist.
  6. Zahnradpumpe nach einem der vorstehenden Ansprüche, wobei die Statoreinheit (2) mehrere Polkerne (8) umfasst, die den Hohlraum (3) umgeben und mit Polköpfen (9) ausgestattet sind, die zum Begrenzen/Definieren des Rands des Hohlraums (3) beitragen; wobei die Längsnut oder -nuten (12) auf mindestens einem der Polköpfe (9) ausgebildet ist/sind.
  7. Zahnradpumpe nach einem der vorstehenden Ansprüche, wobei die Buchse (4) ein zylindrischer, rohrförmiger Körper aus einem Kunststoffmaterial ist.
  8. Zahnradpumpe nach einem der vorstehenden Ansprüche, wobei das mindestens eine Pumpenzahnrad (5, 6) Folgendes umfasst:
    einen Zahnkranz (5) mit inneren Zähnen, der axial drehbar in der Buchse (4) aufgenommen ist; und
    ein Zahnrad (6), das axial drehbar auf einem Trägerstift (13) angeordnet ist, der außermittig innerhalb des Zahnkranzes (5) positioniert ist und in die inneren Zähne des Zahnkranzes (5) eingreift.
  9. Verfahren zur Montage einer Zahnradpumpe (1) zum Pumpen von Flüssigkeiten der Art, die Folgendes umfasst:
    eine Statoreinheit (2), die mit einem im Wesentlichen zylindrischen Hohlraum (3) ausgestattet ist und dazu ausgestaltet ist ein Magnetfeld zu erzeugen, das sich innerhalb des Hohlraums (3) dreht;
    eine im Wesentlichen rohrförmige, zylindrische Buchse (4), die innerhalb des Hohlraums (3) der Statoreinheit (2) formschlüssig angeordnet ist; und
    mindestens ein Pumpenzahnrad (5, 6), das axial drehbar innerhalb der Buchse (4) aufgenommen ist;
    wobei das Montageverfahren dadurch gekennzeichnet ist, dass es die Schritte des Einsetzens der Buchse (4) in den Hohlraum (3) der Statoreinheit (2) und des anschließenden Einspritzens eines Klebstoffs in eine oder mehrere Längsnuten (12), die sich in den Zwischenraum zwischen der Buchse (4) und der Statoreinheit (2) erstrecken, umfasst.
  10. Verfahren zur Montage einer Zahnradpumpe nach Anspruch 9, wobei das Verfahren den Schritt des Einsetzens des mindestens einen Pumpenzahnrads (5, 6) in die Buchse (4) vor dem Einsetzen der Buchse (4) in den Hohlraum (3) der Statoreinheit (2) umfasst.
EP16800919.9A 2015-11-25 2016-11-21 Zahnradpumpe Active EP3380733B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A005909A ITUB20155909A1 (it) 2015-11-25 2015-11-25 Pompa ad ingranaggi
PCT/EP2016/078301 WO2017089298A1 (en) 2015-11-25 2016-11-21 Gear pump

Publications (2)

Publication Number Publication Date
EP3380733A1 EP3380733A1 (de) 2018-10-03
EP3380733B1 true EP3380733B1 (de) 2020-01-08

Family

ID=55538409

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16800919.9A Active EP3380733B1 (de) 2015-11-25 2016-11-21 Zahnradpumpe

Country Status (6)

Country Link
US (1) US20180347566A1 (de)
EP (1) EP3380733B1 (de)
JP (1) JP2018535351A (de)
CN (1) CN108291538A (de)
IT (1) ITUB20155909A1 (de)
WO (1) WO2017089298A1 (de)

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
US11134380B2 (en) 2016-10-11 2021-09-28 Whitefox Defense Technologies, Inc. Systems and methods for cyber-physical vehicle management, detection and control
EP3526722A4 (de) 2016-10-11 2020-05-27 Whitefox Defense Technologies, Inc. Systeme und verfahren zur cyber-physikalischen fahrzeugverwaltung, -erkennung und -steuerung
DE102017223715A1 (de) * 2017-12-22 2019-06-27 Magna Powertrain Bad Homburg GmbH Gerotorpumpe und Verfahren zur Herstellung einer solchen
IT201800006043A1 (it) * 2018-06-05 2019-12-05 Metodo di assemblaggio di una pompa ad ingranaggi
US11558743B2 (en) 2018-09-05 2023-01-17 Whitefox Defense Technologies, Inc. Integrated secure device manager systems and methods for cyber-physical vehicles
IT201800009421A1 (it) * 2018-10-12 2020-04-12 Bosch Gmbh Robert Gruppo di pompaggio per alimentare combustibile, preferibilmente gasolio, ad un motore a combustione interna

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JP4484030B2 (ja) * 2004-01-20 2010-06-16 株式会社ジェイテクト 電動ポンプユニット
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JP2008312347A (ja) * 2007-06-14 2008-12-25 Mitsuba Corp ブラシレスモータ
JP2008312348A (ja) * 2007-06-14 2008-12-25 Mitsuba Corp 電動モータ
JP5126588B2 (ja) * 2008-01-08 2013-01-23 アイシン精機株式会社 電動ポンプ
DE102009028148A1 (de) * 2009-07-31 2011-02-03 Robert Bosch Gmbh Zahnradpumpe
JP2011058441A (ja) * 2009-09-11 2011-03-24 Jtekt Corp 電動ポンプユニット
DE102010029338A1 (de) * 2010-05-27 2011-12-01 Robert Bosch Gmbh Innenzahnradpumpe
DE102010041995A1 (de) * 2010-10-05 2012-04-05 Robert Bosch Gmbh Innenzahnradpumpe
DE102012201299A1 (de) * 2012-01-31 2013-08-01 Robert Bosch Gmbh Pumpe mit Elektromotor
JP6278333B2 (ja) * 2013-09-03 2018-02-14 アイシン精機株式会社 電動モータ

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Also Published As

Publication number Publication date
EP3380733A1 (de) 2018-10-03
US20180347566A1 (en) 2018-12-06
WO2017089298A1 (en) 2017-06-01
JP2018535351A (ja) 2018-11-29
ITUB20155909A1 (it) 2017-05-25
CN108291538A (zh) 2018-07-17

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