WO2018114622A1 - Pompe à engrenages électrique - Google Patents

Pompe à engrenages électrique Download PDF

Info

Publication number
WO2018114622A1
WO2018114622A1 PCT/EP2017/082902 EP2017082902W WO2018114622A1 WO 2018114622 A1 WO2018114622 A1 WO 2018114622A1 EP 2017082902 W EP2017082902 W EP 2017082902W WO 2018114622 A1 WO2018114622 A1 WO 2018114622A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
spur rotor
internal
gerotor
rotor
Prior art date
Application number
PCT/EP2017/082902
Other languages
English (en)
Inventor
Nello Medoro
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 WO2018114622A1 publication Critical patent/WO2018114622A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—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
    • 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
    • F04C15/008—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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/086—Carter

Definitions

  • the present invention relates to an electric gear pump.
  • the present invention relates to a gerotor electric gear pump.
  • the present invention also relates to a pump assembly comprising, in series: - a low-pressure pump (the abovementioned gerotor electric gear pump) for drawing fuel, preferably diesel, and for initial compression of the fuel; and
  • a low-pressure pump the abovementioned gerotor electric gear pump
  • a high-pressure pump preferably with pumping pistons, for further compression of the fuel and for supplying the fuel at high pressure to an internal combustion engine.
  • the use of systems for supplying fuel, in particular diesel, to an internal combustion engine, which comprise a high-pressure pump for supplying the internal combustion engine, and a low-pressure pump for supplying fuel to the high-pressure pump, is already known.
  • the high-pressure pump comprises at least one pumping piston moved by a shaft and housed in a cylinder supplied with fuel at low pressure.
  • At least two different types of low-pressure pump for such systems currently exist.
  • the first type comprises a gear pump which is driven by the same shaft as drives the pistons of the high-pressure pump.
  • this gear pump may be a "gerotor" pump.
  • the gerotor pump comprises an external spur rotor rotated by the shaft and housed inside an internal spur rotor.
  • the spurs of the external spur rotor engage with the spurs of the internal spur rotor, which has one more spur than the external spur rotor.
  • the two rotors rotating either absolutely or relatively, or relative to one another, pump fuel from an inlet, connected to the tank, to an outlet, connected to the high-pressure pump.
  • the second type of gear pump comprises gear pumps not driven by the shaft for driving the pumping pistons, but pumps driven electrically or electromagnetically.
  • this type of pump in current gerotor pumps, at least one out of the internal spur rotor and the external spur rotor has magnetic or ferromagnetic modules, such as bundles of little plaques made of iron, which engage electromagnetically with a stator which is arranged outside of the internal spur rotor and comprises electrical windings.
  • the internal spur rotor is made of sintered steel.
  • the stator with electrical windings which may also be defined as an "electric motor” since it causes the gerotor to move, is placed at the same level as said gerotor so as to increase the electromagnetic interaction.
  • This concentric arrangement of gerotor and stator currently requires the presence of a bearing placed between the external wall of the internal spur rotor of the gerotor and the stator. A high degree of precision in terms of mechanical machining regarding the geometric circularity of the external surface of the internal spur rotor coupled to said bearing is thus necessary.
  • gerotor electric gear pumps are widely used, the current versions of these pumps have a number of drawbacks.
  • an electric gear pump comprising:
  • gerotor that may rotate about an axis of rotation A, comprising an external spur rotor, or simply rotor, and an internal spur rotor, or pinion, arranged outside the external spur rotor;
  • stator having electrical windings arranged outside the covering
  • the internal spur rotor comprises a first body, of annular shape, which is provided internally with spurs for engaging with the pinion, and a second body, which is concentric with the first and connected to the external surface of the latter;
  • the second body is made of plastic
  • the magnetic structure is integrated in the second body of the internal spur rotor.
  • internal and exital refer to the radial distance from the axis of rotation A of the ge rotor.
  • At least the part of the internal spur rotor in which the magnets are housed is made of plastic, thus significantly reducing the complexity and cost of production with respect to the usual rotors made entirely by sintering of metal.
  • the pump comprises a bearing, usually made of plastic, for example PEEK, coupled to the internal surface of the stator facing the gerotor.
  • the internal spur rotor comprises an external surface covering connected externally to the second body, designed to constitute a surface with good wear resistance for sliding on the bearing.
  • this covering is made of metal.
  • the plastic portion of the rotor is protected from any friction with the bearing of the stator and at the same time, the metal covering offers an optimum surface for sliding.
  • the second body has an annular shape centred on the axis A comprising an internal surface coupled to the first body and an external surface coupled to the covering, in which the covering is in turn made in the form of a cylindrical sleeve.
  • the covering has the same height as the external surface of the second body of the internal spur rotor along the axis of rotation A.
  • the second body of the internal spur rotor is made by moulding and the magnetic structure is embedded in the second body in a position at a distance from the external surface of the internal spur rotor.
  • the magnetic structure may comprise at least one annular magnet centred on the axis of rotation.
  • the present invention can be used both for a pump assembly for supplying fuel from a tank to an internal combustion engine which comprises, in series, an electric gear pump as described above and a high-pressure pump, and for just the internal spur rotor as a possible spare part that may be used to improve the pumps currently used.
  • FIG. 1 is a schematic view of an embodiment of a pump assembly for supplying fuel, preferably diesel, from a tank to an internal combustion engine, which comprises, in series, a low-pressure gear pump and a high-pressure pump with pumping pistons;
  • FIG. 2 is a schematic view of a low-pressure gerotor gear pump according to the prior art
  • FIG. 3 is a schematic view along the axis of rotation of a portion of the gerotor according to an embodiment of the invention
  • Figure 4 is a schematic view in section of Figure 3 along the section lines IV-IV;
  • FIG. 5 is a schematic view along the axis of rotation of a portion of the gerotor according to another embodiment of the invention.
  • Figure 6 is a schematic view in section of Figure 5 along the section lines VI- VI.
  • Figure 1 is a schematic view of an embodiment of a pump assembly for supplying fuel, preferably diesel, from a tank to an internal combustion engine, which comprises, in series, a low-pressure pump and a high-pressure pump.
  • a pump assembly 1 comprising:
  • the internal combustion engine 3 is shown only schematically and comprises a common manifold 17 fed by the high-pressure delivery pipes 8 and a plurality of injectors 18 (not shown) designed to spray and inject the fuel at high pressure into the cylinders of the internal combustion engine 3.
  • the high-pressure pump 5 is shown only schematically and comprises two pumping pistons 11 supplied with fuel at low pressure at supply valves 12 and connected to delivery valves 13 for supplying the fuel at high pressure to the engine 3.
  • Figure 1 also shows a filter 10 arranged downstream of the low- pressure pump 4, a fuel measuring device 14 downstream of the filter 10, a relief valve 15 between the filter 10 and the fuel measuring device 14, a pressure limiting valve 19 connected to the manifold 17 and a valve 20 for delivering to the tank 2.
  • the arrows shown in Figure 1 indicate the path of the fuel through the pump assembly 1.
  • FIG. 1 shows a gerotor electric gear pump 4 according to the prior art.
  • Said electric gear pump 4 comprises:
  • gerotor 9 that may rotate about an axis of rotation A, comprising an external spur rotor 21 and an internal spur rotor 22 arranged outside the external spur rotor 21;
  • stator 25 with electrical windings 26, arranged outside and at the same level as the gerotor 9;
  • a support base 24 for the gerotor 9 for the gerotor 9; - a cover 27 that may be coupled to the base 24 in which the supply 6 and delivery 7 pipes are made at least partially; - a bearing 28, with associated seals 16, between the stator and the gerotor 9, in particular the external surface of the internal spur rotor 22.
  • the internal spur rotor 22 has a magnetic structure 23 arranged near the bearing 28 so as to maximize the electromagnetic interaction with the windings 26 of the stator 25.
  • Figure 3 is a schematic view along the axis of rotation A of a gerotor 9 according to a first embodiment of the invention.
  • the internal spur rotor 22 of Figure 3 is made by coupling three different bodies which are concentric with respect to the axis of rotation A.
  • the first body 29, or internal body is made of sintered metal and is provided internally with spurs for engaging with the external spur rotor 21.
  • the second body 30, connected externally to the first 29, is made of moulded plastic in which the magnetic structure 23 is embedded.
  • the magnetic structure comprises a plurality of magnetic sectors 23 spaced apart from one another.
  • the first body 29 and the third body 30 have substantially the same radial extension with respect to the axis A.
  • the third body comprises a metal covering 31, in the form of a cylindrical sleeve, coupled to the external surface of the second body 30 made of plastic.
  • the various bodies making up the rotor 22 of the present invention are connected together preferably by adhesive bonding.
  • Figure 4 is a view in section of the gerotor 9 of Figure 3 along the section lines IV-IV.
  • Figure 4 shows that the metal covering 31 has the same height, along the axis A, as the second body 30 and that the first body 29 and second body 30 are also coupled in terms of shape, radial projecting portions 32 on one body 29 being inserted in radial seats 33 in the other body 30.
  • Figure 3 is a schematic view along the axis of rotation A of a gerotor 9 according to another embodiment of the invention.
  • the magnetic structure 23 has an annular shape so as to keep a homogeneous distribution of material around the periphery of the rotor 22. Indeed, said homogeneous distribution results in better surface machining of the rotor 22.
  • Figure 6 is a view in section of the gerotor 9 of Figure 5 along the section lines

Abstract

L'invention concerne une pompe à engrenages électrique comprenant un rotor denté apte à tourner autour d'un axe de rotation A, comprenant un rotor cylindrique externe et un rotor cylindrique interne disposé à l'extérieur du rotor cylindrique externe ; un stator ayant des enroulements électriques agencés à l'extérieur du revêtement ; au moins une structure magnétique intégrée au rotor cylindrique interne de manière à amener le rotor denté à tourner lorsque les enroulements électriques du stator sont alimentés en courant ; le rotor cylindrique interne comprenant un premier corps et un second corps relié à l'extérieur au premier corps ; le second corps est fait de plastique ; la structure magnétique est intégrée au second corps du rotor cylindrique interne.
PCT/EP2017/082902 2016-12-22 2017-12-14 Pompe à engrenages électrique WO2018114622A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000130240A IT201600130240A1 (it) 2016-12-22 2016-12-22 Pompa elettrica a ingranaggi
IT102016000130240 2016-12-22

Publications (1)

Publication Number Publication Date
WO2018114622A1 true WO2018114622A1 (fr) 2018-06-28

Family

ID=58670177

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/082902 WO2018114622A1 (fr) 2016-12-22 2017-12-14 Pompe à engrenages électrique

Country Status (2)

Country Link
IT (1) IT201600130240A1 (fr)
WO (1) WO2018114622A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004232578A (ja) * 2003-01-31 2004-08-19 Koyo Seiko Co Ltd 電動トロコイドポンプ
EP2459879A2 (fr) * 2009-07-31 2012-06-06 Robert Bosch GmbH Pompe à roue dentée
WO2013127626A2 (fr) * 2012-02-27 2013-09-06 Ixetic Bad Homburg Gmbh Ensemble pompe
DE102012206961A1 (de) * 2012-04-26 2013-10-31 Robert Bosch Gmbh Pumpe mit Elektromotor
WO2016124295A1 (fr) * 2015-02-06 2016-08-11 Robert Bosch Gmbh Unité de pompe permettant d'alimenter en carburant, de préférence du carburant diesel, un moteur à combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004232578A (ja) * 2003-01-31 2004-08-19 Koyo Seiko Co Ltd 電動トロコイドポンプ
EP2459879A2 (fr) * 2009-07-31 2012-06-06 Robert Bosch GmbH Pompe à roue dentée
WO2013127626A2 (fr) * 2012-02-27 2013-09-06 Ixetic Bad Homburg Gmbh Ensemble pompe
DE102012206961A1 (de) * 2012-04-26 2013-10-31 Robert Bosch Gmbh Pumpe mit Elektromotor
WO2016124295A1 (fr) * 2015-02-06 2016-08-11 Robert Bosch Gmbh Unité de pompe permettant d'alimenter en carburant, de préférence du carburant diesel, un moteur à combustion interne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

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