EP2459879B1 - Gear pump - Google Patents

Gear pump Download PDF

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Publication number
EP2459879B1
EP2459879B1 EP10724490.7A EP10724490A EP2459879B1 EP 2459879 B1 EP2459879 B1 EP 2459879B1 EP 10724490 A EP10724490 A EP 10724490A EP 2459879 B1 EP2459879 B1 EP 2459879B1
Authority
EP
European Patent Office
Prior art keywords
stator
gear pump
gear
layer
annular 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
EP10724490.7A
Other languages
German (de)
French (fr)
Other versions
EP2459879A2 (en
Inventor
Josef Frank
Alexander Fuchs
Klaus Ortner
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
Priority to DE102009028148A priority Critical patent/DE102009028148A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PCT/EP2010/057820 priority patent/WO2011012362A2/en
Publication of EP2459879A2 publication Critical patent/EP2459879A2/en
Application granted granted Critical
Publication of EP2459879B1 publication Critical patent/EP2459879B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/082Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086Carter
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008Enclosed motor pump units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008Prime movers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10Rotary-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
    • F04C2/102Rotary-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00Manufacture
    • F04C2230/20Manufacture essentially without removing material
    • F04C2230/22Manufacture essentially without removing material by sintering
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00Components
    • F04C2240/50Bearings
    • F04C2240/56Bearing bushings or details thereof

Description

  • The present invention relates to a gear pump according to the preamble of claim 1.
  • State of the art
  • Screw pumps include, inter alia, internal gear and gerotor pumps in which a driving gear is eccentric in the internal toothing of a toothed ring. Internal gear pumps, which are particularly suitable for providing high pressures, are used to deliver fluids, such as for example, to deliver fuel to an internal combustion engine.
  • In the prior art, it is known to integrate Innenzahnrad- or gerotor pumps in an electronically commutated electric motor, wherein the rotor of the electric motor is simultaneously formed as a toothed ring of Innenzahnrad- or gerotor pump.
  • In DE 10 2006 007 554 A1 a delivery pump is described, which is integrated in an electric motor. The feed pump comprises a first gear and a second gear. Between the two gears, a delivery chamber is formed. The second gear is stored in its center on a thorn. The first gear is an external gear and forms the rotor, the second gear is an internal gear, which is entrained in the eccentric center of the first gear. The first gear comprises glued permanent magnets, which are distributed over the circumference. External magnetic field generators generate a rotating, rotating field which causes direct motor following of the rotor.
  • The problem with such configurations, however, is the bearing of the toothed ring, which must take over the driving torque of the electric motor. At the same time, the hydraulic forces of the internal gear pump must be transferred to the stator and further to the pump housing.
  • In EP 1 600 635 A2 An internal gear pump is described which has a pump section with an inner rotor formed on its outer periphery with teeth. An outer rotor has teeth formed on its inner periphery. Both rotors are housed in a housing. The storage of the outer rotor formed as a toothed ring takes place here by means of specially shaped additional components.
  • document JP 2005 098268 A discloses a gear pump with an electrically commutatable stator on which a sliding bearing is provided.
  • document DE 102 48 933 C1 discloses an internal gear pump having an electric drive formed by a ring gear forming the interior of a rotor and a stator disposed adjacent thereto.
  • document GB 2 080 424 A discloses a gear pump with a sliding bearing.
  • The known in the prior art solutions for mounting the ring gear in an internal gear pump or in a gerotor pump are mechanically complicated construction and therefore structurally complex, complex and expensive to manufacture.
  • Therefore, it is necessary to provide a simple and inexpensive solution for supporting a toothed ring for a gear pump, in particular for an internal gear pump or a gerotor pump.
  • Disclosure of the invention Advantages of the invention
  • There is provided a gear pump for conveying a fluid having a rotatably mounted externally toothed gear and an internally toothed ring, which are for generating a conveying effect in meshing engagement, and which are arranged together with an electrically commutatable stator in a housing, wherein the stator concentrically around extends around the toothed ring and cooperates with the toothed ring to produce an electromotive force, and wherein the toothed ring has a closed, homogeneous cylindrical surface and provided on the stator a sliding bearing is. By providing the sliding bearing directly on the stator a structurally simple and therefore cost-effective solution for storage is provided.
  • Preferably, the toothed ring made of sintered steel or plastic.
  • According to a preferred embodiment, the motor is designed as a permanent magnet synchronous motor and the magnets are integrated in the toothed ring.
  • According to a further preferred embodiment, the motor is designed as a reluctance motor and in the toothed ring holes or special recesses are introduced to form magnetic poles by field weakening.
  • The sliding bearing is formed on the stator as a layer applied to a surface of the stator opposite the toothed ring, so that the sliding bearing is integrated into the stator. The stator, which may be a stator of a permanent magnet or reluctance motor, therefore advantageously acts on the inner diameter at the same time as a radial bearing for the rotor, which is designed as a toothed ring or outer ring of Innenzahnrad- or ring gear pump. The sliding bearing serves primarily as a wear protection layer between stator and rotor. In addition, the sliding bearing provides a centering function for the rotor and can reduce or prevent axial gap losses with appropriate design. This improves the efficiency of the electric motor.
  • According to the invention, the layer is designed with an extension, so that the stator rests against an inner wall of the housing with a bias voltage. In particular, the layer is designed so that the bias acts to push the slide bearing in the axial direction corresponding to the top or against the inner wall when mounting the lid. This results in no or a very small axial air gap and consequently occur only very small gap loss.
  • According to a preferred embodiment, the layer consists of plastic or of a non-ferromagnetic material, in particular of bronze.
  • According to yet a preferred embodiment, the layer has a layer thickness which is less than or equal to 0.3 mm. Since a sliding bearing with a thin layer thickness is integrated into the stator, a correspondingly small air gap between the stator and the rotor can be ensured, in particular in the case of the embodiment with reluctance motor. Consequently, a good efficiency of the electric motor can be displayed.
  • According to yet another preferred embodiment, the layer is sprayed, glued or vulcanized onto the stator.
  • Brief description of the drawings
  • Hereinafter, embodiments of the invention will be described in more detail with reference to the accompanying drawings. It shows:
  • Fig. 1
    a section through an internal gear pump according to the prior art,
    Fig. 2
    a cross section through an internal gear pump according to an embodiment;
    Fig. 3
    a longitudinal section through the internal gear pump of Fig. 2 ,
    Embodiments of the invention
  • In Fig. 1 shows a section through an internal gear pump 1 according to the prior art. The internal gear pump 1 comprises a pair of gears, which consists of an internally toothed ring gear 2 and an externally toothed gear 3. The gear 3 is arranged eccentrically to the toothed ring 2 rotatably on a bearing journal 4. If the toothed ring 2 is set in a rotational movement, then the external toothing of the toothed wheel 3 meshes in the internal toothing of the toothed ring 2 and generates a delivery volume flow of the fluid in which the teeth run. The gear pair of the toothed ring 2 and the gear 3 is arranged in a housing 5, wherein the bearing pin 4 is integrally formed or integrally with the housing 5. The toothed ring 2 is also rotatable with a magnetic ring 6, wherein the magnetic ring 6 extends radially around the toothed ring 2. The magnetic ring 6 runs in an inner side of a stator 7, which has an electric winding 8. If the electric winding 8 is commutated electrically by a controller, a circulating magnetic field is generated in the stator 7. Due to the rotating magnetic field of the magnet ring 6 is set in rotation, wherein due to the rotationally fixed connection of the magnet ring 6 with the toothed ring 2, the teeth consisting of the toothed ring 2 and the gear 3 is put into operation. The magnetic ring 6 is slidably mounted on the stator 7. Here, the magnetic ring 6 is provided with a corresponding coating of a suitable sliding material. This design is problematic for the application of high discharge pressures and poorly lubricating liquids such as gasoline or diesel.
  • The open side of the housing 5 of the internal gear pump 1 is closed by means of a connection cover 9, wherein a sealing element 10 is provided for the fluid-tight sealing of the gaps between the connection cover 9 and the housing 5. The sealing element 10 is designed as an O-ring and is arranged in a corresponding circumferential groove (not shown) within the connection cover 9.
  • Fig. 2 shows a cross section through an internal gear pump 1 according to one embodiment. At or in which acts as a rotor toothed ring 2 a plurality of magnets 11 is provided (permanent magnet motor). If the electric motor is alternatively designed as a reluctance motor, then instead of the magnets 11 holes (not shown here) are provided for field weakening.
  • On the stator 7, a sliding bearing 13 is provided on a cylindrical surface 12 opposite the toothed ring 2, or the sliding bearing 13 is integrated in the stator 7. The slide bearing 13 serves primarily as a wear protection layer between the stator 7 and the rotor or the toothed ring 2. In addition, the slide bearing 13 has a centering function for the rotor or the toothed ring 2 and can reduce or prevent axial gap losses with appropriate design, as in Related to Fig. 3 will be explained in more detail. The sliding bearing 13 is formed by a thin layer of plastic sprayed onto the stator 7.
  • Fig. 3 shows a longitudinal section through the internal gear pump 1 of Fig. 2 , Here it can be seen that the sliding bearing 13, which is applied to the stator 7 and injected into the stator 7, is formed as a layer having a thickness of less than 0.3 mm, which axially with respect to an inner wall 14 of the housing 5 with an extension 15 is designed such that a bias by conditioning the layer on the inner wall 14 of the housing 5 is formed. When mounting the connection cover 9, the sliding bearing 13 is pressed in the axial direction against the inner wall 14. Thus, the stator 7 can be axially fixed. Furthermore, this special embodiment of the sliding bearing 13 can be used as an axial circumferential seal.
  • In the gear pump 1 according to the invention, a structurally simple and thus inexpensive slide bearing is provided.

Claims (7)

  1. Gear pump (1) for delivering a fluid having a rotatably mounted externally toothed gearwheel (3) and an internally toothed annular gear (2) which are in meshing engagement with one another in order to generate a delivery action and which are arranged together with an electrically commutatable stator (7) in a housing (5), the stator (7) extending concentrically around the annular gear (2) and interacting with the annular gear in order to generate an electromotive force, the annular gear (2) having a closed, homogeneous cylindrical surface and a sliding bearing (13) being provided on the stator (7), the sliding bearing (13) being formed on the stator (7) as a layer which is applied on a surface (12) of the stator (7), which surface (12) lies opposite the annular gear (2), characterized in that the layer is configured with a projection (15), with the result that the stator (7) bears with a prestress against an inner wall (14) of the housing (5).
  2. Gear pump (1) according to Claim 1, characterized in that the layer is composed of plastic or of a non-ferromagnetic material, in particular of bronze.
  3. Gear pump (1) according to Claim 1 or 2, characterized in that the layer has a layer thickness which is less than or equal to 0.3 mm.
  4. Gear pump (1) according to Claims 1 to 3, characterized in that the layer is injection-moulded, adhesively bonded or vulcanized onto the stator (7).
  5. Gear pump (1) according to Claims 1 to 4, characterized in that the annular gear (2) is composed of sintered steel or plastic.
  6. Gear pump (1) according to Claims 1 to 5, characterized in that the motor is configured as a permanent-magnet synchronous motor and the magnets (11) are integrated into the annular gear (2).
  7. Gear pump (1) according to Claims 1 to 5, characterized in that the motor is configured as a reluctance motor and holes or recesses are made in the annular gear (2), in order to form magnetic poles by way of field weakening.
EP10724490.7A 2009-07-31 2010-06-04 Gear pump Active EP2459879B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102009028148A DE102009028148A1 (en) 2009-07-31 2009-07-31 Gear pump
PCT/EP2010/057820 WO2011012362A2 (en) 2009-07-31 2010-06-04 Gear pump

Publications (2)

Publication Number Publication Date
EP2459879A2 EP2459879A2 (en) 2012-06-06
EP2459879B1 true EP2459879B1 (en) 2013-08-14

Family

ID=43402326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10724490.7A Active EP2459879B1 (en) 2009-07-31 2010-06-04 Gear pump

Country Status (8)

Country Link
US (1) US9163626B2 (en)
EP (1) EP2459879B1 (en)
JP (1) JP5563078B2 (en)
CN (1) CN102483057B (en)
DE (1) DE102009028148A1 (en)
ES (1) ES2426474T3 (en)
RU (1) RU2543106C2 (en)
WO (1) WO2011012362A2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112013001156A5 (en) 2012-02-27 2014-12-11 Magna Powertrain Bad Homburg GmbH pump assembly
CA2898451A1 (en) * 2013-03-14 2014-09-18 Allison Transmission, Inc. Electric pump for a hybrid vehicle
ITUB20155909A1 (en) * 2015-11-25 2017-05-25 Bosch Gmbh Robert Gear pumps
DE102016200013A1 (en) * 2016-01-04 2017-07-06 Röchling Automotive SE & Co. KG Pump
ITUB20161058A1 (en) * 2016-02-25 2017-08-25 Bosch Gmbh Robert Pumping unit for supplying fuel, preferably diesel fuel, to an internal combustion engine
ITUA20163309A1 (en) * 2016-05-10 2017-11-10 Bosch Gmbh Robert Pumping unit for supplying fuel, preferably diesel fuel, to an internal combustion engine
DE102016224898A1 (en) * 2016-12-14 2018-06-14 Zf Friedrichshafen Ag Pumping device for an automatic transmission
IT201600130240A1 (en) * 2016-12-22 2018-06-22 Bosch Gmbh Robert Gear electric pump
IT201600130258A1 (en) * 2016-12-22 2018-06-22 Bosch Gmbh Robert Gear electric pump
IT201600130278A1 (en) * 2016-12-22 2018-06-22 Bosch Gmbh Robert Gear electric pump
EP3382888B1 (en) * 2017-03-31 2020-06-17 Grundfos Holding A/S Pump assembly and controlling method
CN107905997B (en) * 2017-10-19 2019-03-08 浙江大学 A kind of gear ring structure of anti abrasive Internal Gear Pump Used in Water Hydraulics
IT201800006043A1 (en) * 2018-06-05 2019-12-05 A method of assembling a gear pump

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JPH11210642A (en) * 1998-01-20 1999-08-03 Zexel:Kk Internal gear pump
DE10248933C1 (en) * 2002-10-19 2003-12-11 Pumpenfabrik Ernst Scherzinger Electrically-driven internal cogwheel pump has casing screening stator of electric motor from internally toothed hollow wheel and cooperating externally toothed wheel pressed against bearing pin for latter
JP2004232578A (en) * 2003-01-31 2004-08-19 Koyo Seiko Co Ltd Electric trochoid pump
JP4245997B2 (en) * 2003-07-07 2009-04-02 直樹 宮城 Small gear pump
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Also Published As

Publication number Publication date
RU2543106C2 (en) 2015-02-27
CN102483057B (en) 2015-05-20
JP5563078B2 (en) 2014-07-30
US20120171061A1 (en) 2012-07-05
DE102009028148A1 (en) 2011-02-03
RU2012107226A (en) 2013-09-10
JP2013500428A (en) 2013-01-07
EP2459879A2 (en) 2012-06-06
ES2426474T3 (en) 2013-10-23
WO2011012362A3 (en) 2011-12-22
US9163626B2 (en) 2015-10-20
WO2011012362A2 (en) 2011-02-03
CN102483057A (en) 2012-05-30

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