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US20160222963A1 - Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement - Google Patents

Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement Download PDF

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Publication number
US20160222963A1
US20160222963A1 US15/021,164 US201415021164A US2016222963A1 US 20160222963 A1 US20160222963 A1 US 20160222963A1 US 201415021164 A US201415021164 A US 201415021164A US 2016222963 A1 US2016222963 A1 US 2016222963A1
Authority
US
United States
Prior art keywords
pump
displacement
actuator
stator ring
cavity
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.)
Abandoned
Application number
US15/021,164
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English (en)
Inventor
Leonardo Cadeddu
Alessandro Fauda
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.)
VHIT SpA
Original Assignee
VHIT SpA
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 VHIT SpA filed Critical VHIT SpA
Assigned to VHIT, S.P.A. reassignment VHIT, S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CADEDDU, LEONARDO, FAUDA, ALESSANDRO
Publication of US20160222963A1 publication Critical patent/US20160222963A1/en
Abandoned legal-status Critical Current

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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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • 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
    • F01C21/106—Stators; Members defining the outer boundaries of the working chamber with a radial surface, e.g. cam rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • 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
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238—Rotary pumps
    • 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
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring

Definitions

  • the present invention relates to variable displacement pumps, and more particularly it concerns a rotary positive displacement pump of the kind in which the displacement variation is obtained by means of the rotation of an eccentric ring (stator ring).
  • the invention also concerns a method of regulating the displacement of such a pump.
  • the present invention is employed in a pump for the lubrication oil of a motor vehicle engine.
  • a system often used in rotary pumps employs a stator ring with an internal cavity, eccentric relative to the external surface, inside which the rotor, in particular a vane rotor, rotates, the rotor being eccentric with respect to the cavity under operating conditions of the pump.
  • the stator ring rotate by a given angle, the relative eccentricity between the rotor and the cavity, and hence the displacement, is made to vary between a maximum value and a minimum value, substantially tending to zero (stall operating condition).
  • a suitably calibrated opposing resilient member allows the rotation when a predetermined delivery rate is attained and makes the pump substantially deliver such a predetermined delivery rate under steady state conditions.
  • An example is disclosed in U.S. Pat. No. 2,685,842.
  • the pump includes an electromagnetic rotary actuator, integrated into or coupled with the pump, which is driven by an electronic system detecting operating conditions of the pump and is arranged to transmit the rotary motion to the stator ring.
  • stator ring is housed within an eccentric cavity of an external ring, and the rotary actuator is arranged to simultaneously transmit the rotary motion to both rings, in such a way as to cause a synchronous rotation thereof by an equal amount in opposite directions.
  • the invention also implements a method of regulating the displacement of a rotary positive displacement pump by means of the rotation of an eccentric stator ring inside which the rotor rotates, the method comprising the steps of:
  • the method further comprises the steps of:
  • a lubrication system for a motor vehicle engine in which the adjustable displacement pump and the method of regulating the displacement set forth above are employed.
  • FIG. 1 is a plan view of a first embodiment of the pump according to the invention, from which the cover and the regulation actuator have been removed, in the minimum displacement position;
  • FIG. 2 is a view similar to FIG. 1 , in the maximum displacement position
  • FIG. 3 is a plan view similar to FIG. 2 , showing the delivery rate regulation mechanism integrated in the cover;
  • FIG. 4 is a cross-sectional view of the pump taken according to a plane passing through line Y-Y in FIG. 3 ;
  • FIGS. 5 and 6 are views similar to FIGS. 1 and 2 , relating to a second embodiment of the pump according to the invention.
  • FIG. 7 is a principle block diagram of the displacement regulating circuit.
  • a pump 1 more particularly a vane pump, includes a body 10 having a cavity 11 with substantially circular cross-section in which a first movable ring 12 (external ring) is located.
  • the ring in turn has an axial cavity 13 , also with substantially circular cross-section, eccentrically arranged relative to cavity 11 .
  • a second movable ring 42 (stator ring) is located in cavity 13 , which ring in turn has an axial cavity 43 , also with substantially circular cross-section, eccentrically arranged relative to cavity 13 and having a centre O′.
  • Rings 12 and 42 are arranged to rotate in mutually opposite directions by a certain angle in order to vary the pump displacement, as it will be disclosed below.
  • cavities 13 , 43 have the same eccentricities.
  • cavity 11 is blind and is closed at one end by a cover 14 ( FIG. 4 ), also closing the corresponding ends of cavities 13 , 43 .
  • Cavity 43 in turn houses a rotor 15 , rigidly connected to a driving shaft 15 a making it rotate about a centre O, for instance in clockwise direction, as shown by arrow F. Cavity 43 thus forms the pumping chamber.
  • rotor 15 and cavity 43 are coaxial or substantially coaxial
  • centres O and O′ are located on the same axis X-X and are mutually spaced apart
  • rotor 15 is substantially tangent to side surface 43 a of cavity 43 .
  • coaxial or substantially coaxial is used to denote a minimum distance, tending to 0, between centres O and O′.
  • eccentric rings 12 and 42 are mounted in such a manner that, in the minimum displacement position, external ring 12 is oriented so that its minimum radial thickness is located at the top in the Figure and internal ring 42 is oriented so that its minimum radial thickness is located at the bottom in the Figure. Otherwise stated, the eccentricities of the respective cavities 13 , 43 are offset by 180°. Preferably, cavities 13 , 43 have the same eccentricity relative to the external surface of the respective ring.
  • Rotor 15 has a set of vanes 16 , radially slidable in respective radial slots. At an outer end, vanes 16 are at a minimum distance from side surface 43 a of cavity 43 , whereas at their inner end they rest on guiding or centring rings 17 , mounted at the axial ends of rotor 15 and arranged to maintain the minimum distance between vanes 16 and surface 43 a under any condition of eccentricity. Also centring rings 17 will be coaxial or substantially coaxial with rotor 15 in the minimum displacement position.
  • a suction chamber 18 communicating with a suction duct 20
  • a delivery chamber 19 communicating with a delivery duct 21
  • Such chambers are substantially symmetrical with respect to a plane passing through axis X-X and have phasings that are ideal for the maximum volumetric efficiency, as it is clearly apparent for the skilled in the art. It is to be appreciated that, should the rotor rotate in counterclockwise direction, the functions of such chambers, and hence of the respective ducts, would be mutually exchanged
  • toothed sectors 51 , 52 are formed on their facing surfaces and are preferably positioned at the base of suitable stator cavities 11 a , 11 b formed in rings 12 , 42 .
  • a toothed wheel 53 having a shaft 54 rigidly connected to an actuator 50 ( FIG. 4 ) driving it into rotation is interposed between toothed sectors 51 , 52 located in said stator cavities 11 a , 11 b .
  • actuator 50 is an electromagnetic actuator. It may be a rotary actuator, e.g. a step-by-step micromotor integrated into pump 1 or coupled therewith (e.g. interfaced through the partition wall separating the inside from the outside of the engine sump), or a linearly moving actuator coupled with a suitable escapement ratchet gear in order to convert the actuator motion into a rotary motion.
  • a rotary actuator e.g. a step-by-step micromotor integrated into pump 1 or coupled therewith (e.g. interfaced through the partition wall separating the inside from the outside of the engine sump)
  • a linearly moving actuator coupled with a suitable escapement ratchet gear in order to convert the actuator motion into a rotary motion.
  • Actuator 50 is controlled by the electronic control unit of the vehicle, which manages the displacement variation in closed loop (e.g. with feedback), by increasing or reducing the displacement depending on the requirements of the thermal engine and the accessories thereof.
  • the variation is independent of the pressures upstream and downstream the oil filter.
  • Shaft 54 is guided within a support 40 formed in cover 14 or in body 10 .
  • Toothed sectors 51 , 52 while rotating, develop according to a profile defined by the involute of the teeth of wheel 53 , which, on the contrary, rotates about its stationary axis. If the eccentricities are the same, the relative rotation of the rings causes a translation of centre O′ of pumping chamber 43 along axis X-X. This makes the geometry of pumping chamber 43 perfectly symmetric in all displacement conditions, and makes the ratio between the rotation of toothed wheel 53 and the displacement variation because of the translation of axis of chamber 43 constant.
  • wheel 53 cooperates with a member 34 opposing the rotation of rings 12 , 42 , in particular a flat spiral spring, preloaded so as to prevent the rotation of the rings as long as the torque applied by actuator 50 is lower than a predetermined threshold.
  • Spiral spring 34 is located in a casing 33 that, in the illustrated exemplary embodiment, is fastened to cover 14 .
  • the inner end portion of spring 34 is so shaped as to be coupled with the end portion of shaft 54 of wheel 53 , whereas the outer end portion is locked to the internal wall of casing 33 .
  • the latter may be rotated, for instance by using a dynamometric key, in order to adjust the preloading of spring 34 .
  • a ring nut 55 allows blocking casing 33 in the desired calibration position, independently of the constructional tolerances of the whole mechanism.
  • a sealing gasket 56 is moreover provided between casing 33 and cover 14 in order to isolate the internal chamber of the same casing from the outside.
  • a drain puts such a chamber in communication with suction chamber 18 , for the aims that will be disclosed below.
  • spiral spring 34 thanks to the negligible variation of the twisting torque and to the transmission ratio of the gear mechanism, will undergo negligible variations of its torque opposing the hydraulic torque.
  • spring 34 may contribute to make the magnetic resistance torque between subsequent steps sufficient to maintain the position of rings 12 , 42 when the motor in not excited (energy saving).
  • spring 34 could contribute to maintaining a maximum displacement upon the occurrence of an electric failure.
  • Rings 12 and 42 are preferably formed by moulding and/or metal powder sintering, with possible finishing operations on some limited areas, according to the dictates of the art. More particularly, axial thicknesses will undergo finishing.
  • Body 10 and cover 14 can be formed by moulding either an aluminium alloy or a thermoplastic and/or thermosetting resin.
  • spring 34 may be made of a bimetallic material, so that its characteristic may change depending on the operation temperature.
  • FIGS. 5 and 6 A second embodiment of the pump according to the invention, denoted 101 , is shown in FIGS. 5 and 6 . Elements that are functionally identical to those already disclosed with reference to FIGS. 1 to 4 are preferably denoted by the same reference numerals, increased by 100.
  • Pump 101 differs from pump 1 in that external ring 12 is lacking and therefore actuator 150 acts through wheel 153 onto stator ring 142 alone, which is formed internally of body 110 with substantially circular cross-section.
  • stator ring 142 preferably comprises a stator cavity 111 in which both toothed sector 152 and toothed wheel 153 are arranged.
  • toothed sector 152 is located at the base of stator cavity 111 and the toothed wheel is preferably wholly included between toothed sector 152 and body 110 with substantially circular cross-section.
  • the arrangement of toothed sector 152 and toothed wheel 153 allows minimising the size of pump 101 .
  • rotor 115 rotates in counterclockwise direction (arrow F′). With such an arrangement, the translation of centre O′ of chamber 143 takes place along a non-rectilinear trajectory.
  • the structure is identical to that of pump 1 ad it is not necessary to describe it again.
  • FIG. 7 shows a principle block diagram of the regulation of the displacement of pumps 1 , 101 .
  • Dashed line denotes the mechanical drive of the pump by actuator 50 and hence corresponds to toothed wheels 53 , 153 of the previous Figures.
  • Dotted and dashed line 60 denotes the lubrication circuit which conveys oil from pump 1 to the engine and the various accessories, denoted in the whole 61 .
  • Reference numeral 62 denotes the electronic control unit of the vehicle, which receives signals from detectors denoted in the whole 63 and controls actuator 50 , possibly through a digital-to-analogue converter, not shown.
  • Solid lines denote the paths of the electric signals incoming into/outgoing from control unit 62
  • dotted lines denote the detection of the operating parameters of engine 61 , pump 1 , lubrication circuit 60 and possibly actuator 50 by detectors 63 .
  • the parameters on which regulation of the delivery rate of the pump for lubrication of a motor vehicle engine may depend are well known to the skilled in the art and are not of interest for the invention. A more detailed description can be found in US 2011/0209682.
  • the delivery pressure or the pressure downstream the oil filter are detected by the suitable detectors 63 and communicated to control unit 62 , which will make actuator 50 rotate.
  • the actuator will in turn generate a rotation torque that, through wheel 53 and once the calibration value of counteracting spring 34 has been attained, will make rings 12 , 42 rotate by the same angle in opposite directions. If, as it has been assumed, the eccentricities of cavities 13 , 43 relative to the external surfaces of the respective rings are the same, the rotation of ring 42 will cause a rectilinear translation of centre O′ towards the right, proportional to the amount of the rotation, thereby proportionally reducing the eccentricity between rotor 15 and cavity 43 , and consequently the pump displacement, and stabilising the pressure at the calibration value.
  • control unit 62 When, as a function of the different operating parameters of the engine, it is desired to operate at a lower pressure value, with a consequent reduction in the absorbed power, control unit 62 will generate a suitable command for actuator 50 , so as to further reduce the displacement.
  • the rotation of the rings may continue until the position shown in FIG. 1 is attained, where centres O and O′ coincide and vanes 16 and centring rings 17 rotate with the rotor without changes in their radial relative position. Consequently, the displacement is null and the pump is in stall condition. It is to be pointed out that this position may be taken when a hydraulic lock of the delivery pressure is approaching. In the constructional practice, a minimum displacement is preferably maintained by protecting the pump with a maximum pressure valve.
  • the invention actually attains the desired aims.
  • spring 34 could not be a bimetallic spring and, at least in the embodiments where actuator 50 is a step-by-step motor, the spring could be dispensed with, the only magnetic resistance torque between subsequent steps maintaining the position of rings 12 , 42 when the motor is not excited.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Rotary Pumps (AREA)
US15/021,164 2013-09-11 2014-09-09 Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement Abandoned US20160222963A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000735A ITTO20130735A1 (it) 2013-09-11 2013-09-11 Pompa a cilindrata variabile con comando elettrico della regolazione e metodo di regolazione della sua cilindrata
ITTO2013A000735 2013-09-11
PCT/IB2014/064338 WO2015036913A2 (en) 2013-09-11 2014-09-09 Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement

Publications (1)

Publication Number Publication Date
US20160222963A1 true US20160222963A1 (en) 2016-08-04

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US15/021,164 Abandoned US20160222963A1 (en) 2013-09-11 2014-09-09 Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement

Country Status (5)

Country Link
US (1) US20160222963A1 (it)
EP (1) EP3044414A2 (it)
CN (1) CN105593468A (it)
IT (1) ITTO20130735A1 (it)
WO (1) WO2015036913A2 (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11396811B2 (en) 2017-12-13 2022-07-26 Pierburg Pump Technology Gmbh Variable lubricant vane pump

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202015008501U1 (de) * 2015-12-10 2017-03-13 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Flügelzellenpumpe
US10167752B2 (en) * 2017-02-10 2019-01-01 GM Global Technology Operations LLC Engine oil pump with electronic oil pressure control
DE102019121958A1 (de) * 2019-08-14 2021-02-18 Schwäbische Hüttenwerke Automotive GmbH Flügelzellenpumpe mit Druckausgleichsverbindung
CN110953150A (zh) * 2019-11-05 2020-04-03 新乡航空工业(集团)有限公司 一种11次幂旋板泵定子内廓曲线设计方法
CN112172916A (zh) * 2020-11-10 2021-01-05 三一专用汽车有限责任公司 转向泵和作业车辆

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US4659297A (en) * 1984-12-05 1987-04-21 Alfred Teves Gmbh Variable capacity vane motor having rotatable and stationary cam rings
US4818196A (en) * 1986-01-16 1989-04-04 Alfred Teves Gmbh Variable capacity vane-type motor having a control channel selectively communicating with the work chamber
US4955245A (en) * 1988-02-11 1990-09-11 Holland Hellas Holding B.V. Gas spring for actuator
DE19924645A1 (de) * 1999-05-28 2000-11-30 Lmf Leobersdorfer Maschinenfab Drehschieberverdichter oder -vakuumpumpe
US8113804B2 (en) * 2008-12-30 2012-02-14 Hamilton Sundstrand Corporation Vane pump with rotating cam ring and increased under vane pressure

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US2685842A (en) * 1948-11-18 1954-08-10 George H Hufferd Variable displacement pump and volume control therefor
FR1183989A (fr) * 1957-10-07 1959-07-16 Blackmer Pump Company Pompe volumétrique à palettes rotatives à débit variable
DE2249591C3 (de) * 1972-10-10 1975-08-14 Danfoss A/S, Nordborg (Daenemark) Fördermengenregelbare Rotationskolbenpumpe
US4406599A (en) * 1980-10-31 1983-09-27 Vickers, Incorporated Variable displacement vane pump with vanes contacting relatively rotatable rings
CN102333956A (zh) * 2009-03-05 2012-01-25 Stt技术股份有限公司,麦格纳动力股份有限公司和Shw有限公司的合资公司 直接控制线性变排量叶片泵
US8499738B2 (en) 2010-03-01 2013-08-06 GM Global Technology Operations LLC Control systems for a variable capacity engine oil pump
WO2013140305A1 (en) * 2012-03-19 2013-09-26 Vhit Spa Variable displacement pump with double eccentric ring and displacement regulation method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4659297A (en) * 1984-12-05 1987-04-21 Alfred Teves Gmbh Variable capacity vane motor having rotatable and stationary cam rings
US4818196A (en) * 1986-01-16 1989-04-04 Alfred Teves Gmbh Variable capacity vane-type motor having a control channel selectively communicating with the work chamber
US4955245A (en) * 1988-02-11 1990-09-11 Holland Hellas Holding B.V. Gas spring for actuator
DE19924645A1 (de) * 1999-05-28 2000-11-30 Lmf Leobersdorfer Maschinenfab Drehschieberverdichter oder -vakuumpumpe
US8113804B2 (en) * 2008-12-30 2012-02-14 Hamilton Sundstrand Corporation Vane pump with rotating cam ring and increased under vane pressure

Non-Patent Citations (1)

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Title
Machine Translation DE 199 24 645 done 10/2/2017 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11396811B2 (en) 2017-12-13 2022-07-26 Pierburg Pump Technology Gmbh Variable lubricant vane pump

Also Published As

Publication number Publication date
EP3044414A2 (en) 2016-07-20
WO2015036913A2 (en) 2015-03-19
CN105593468A (zh) 2016-05-18
ITTO20130735A1 (it) 2015-03-12
WO2015036913A3 (en) 2015-05-28

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Owner name: VHIT, S.P.A., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CADEDDU, LEONARDO;FAUDA, ALESSANDRO;REEL/FRAME:038049/0793

Effective date: 20160223

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION