EP2187057A1 - Pompe à engrenages internes - Google Patents

Pompe à engrenages internes Download PDF

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Publication number
EP2187057A1
EP2187057A1 EP09174909A EP09174909A EP2187057A1 EP 2187057 A1 EP2187057 A1 EP 2187057A1 EP 09174909 A EP09174909 A EP 09174909A EP 09174909 A EP09174909 A EP 09174909A EP 2187057 A1 EP2187057 A1 EP 2187057A1
Authority
EP
European Patent Office
Prior art keywords
gerotor pump
lobed
pump
outer rotor
pumping chamber
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.)
Withdrawn
Application number
EP09174909A
Other languages
German (de)
English (en)
Inventor
Simone Orlandi
Marco Simoni
Andrea Carreri
Luca Nicolini
Franco Lodi
Roberto Magrini
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.)
CNH Industrial Italia SpA
Original Assignee
CNH Industrial Italia 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 CNH Industrial Italia SpA filed Critical CNH Industrial Italia SpA
Publication of EP2187057A1 publication Critical patent/EP2187057A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
    • 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
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • 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
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Definitions

  • the present invention relates to a gerotor oil pump. More specifically, the present invention relates to a gerotor pump (generated pump rotor) comprising an inner rotor with a given number of lobes; and an outer rotor (normally with one more lobe than the inner rotor).
  • the inner rotor is eccentric with respect to the outer rotor, and the inner rotor lobes mesh with the outer rotor lobes to cyclically form a number of compression chambers between the lobes, in which the fluid is compressed and fed to a delivery conduit.
  • Gerotor pumps are used in a wide range of applications, such as automotive oil pumps.
  • Gerotor pumps are also widely used in farm tractor hydraulic circuits.
  • the present invention may therefore be used to particular advantage, though not exclusively, in the manufacture of farm tractors, to which the following description refers purely by way of example.
  • Known gerotor pumps normally comprise a pump body closed by a cover.
  • the pump body in turn comprises a cavity for housing:
  • the thickness of the rotors must necessarily be increased, thus resulting, in the case of very thick rotors, in a considerable increase in vibration and therefore in the noise level of the pump.
  • the present invention is designed to eliminate these drawbacks by cutting the inner rotor (and possibly also the outer rotor) into at least two portions along a plane perpendicular to its axis of rotation.
  • the rotors may be more than two in number, and may be of the same or different thicknesses.
  • Number 10 in Figure 1 indicates as a whole a gerotor pump in accordance with the present invention.
  • Gerotor pump 10 comprises a pump body 11 and a cover 12 which "pack" together a number of parts described below.
  • Said parts comprise a first outer rotor 13; a first inner rotor 14; an annular partition disk 15; a second inner rotor 16; a second outer rotor 17; and a drive shaft 18 rotated by a motor (not shown) and having a longitudinal axis (AX) which is also the axis of rotation of drive shaft 18.
  • Pump body 11 (which is later closed by cover 12) has a cavity (CV) for housing :
  • both disk 15 and the two outer rotors 13, 17 are mounted idly on drive shaft 18.
  • the outside diameters of disk 15 and the two outer rotors 13, 17 are substantially equal to the diameter of cavity (CV) of pump body 11.
  • One aspect of the present invention therefore lies in cutting an inner rotor and an outer rotor each into two parts along a plane ( ⁇ ) substantially perpendicular to the axis (AX) of drive shaft 18 ( Figure 1 ).
  • the two inner rotors 14, 16 can be mounted offset with respect to each other by an angle (not shown) formed between a lobe (LB2) of a first lobed portion (14) and a lobe (LB3) of a second lobed portion (16).
  • the offset angle may be such that at least one lobe (LB2) of inner rotor 14 corresponds to a gap between two adjacent lobes (LB3) of inner rotor 16.
  • Offsetting inner rotors 14 and 16 is advantageously assisted using a drive shaft 18 with longitudinal grooves (not shown in Figure 1 ) which mate with like grooves (not shown) in the walls of respective central through holes (FP1), (FP3) of inner rotors 14, 16.
  • a partition disk 15 when pump 10 is fully assembled, parts 13, 14, 15, 16, 17 are packed together between the end (FND) of cavity (CV) of pump body 11 and cover 12, which is tightened onto pump body 11 by four screws (VT); and parts 13, 14, 15, 16, 17 are all fitted through with drive shaft 18, the ends 18A, 18B of which are supported by bearings (BR1), (BR2) housed respectively inside a seat (ALL1) in the end (FND) of cavity (CV), and a seat (ALL2) inside cover 12.
  • bearings (BR1), (BR2) housed respectively inside a seat (ALL1) in the end (FND) of cavity (CV), and a seat (ALL2) inside cover 12.
  • partition disk 15 forms a first pumping chamber (PP1) and a second pumping chamber (PP2).
  • first pumping chamber (PP1) is defined at one end by end (FND) of cavity (CV), and at the other end by a first face (FFC1) of partition disk 15, and houses first outer rotor 13, first inner rotor 14, and a first portion of drive shaft 18.
  • Second pumping chamber (PP2) is defined at one end by the end of cover 12, and at the other end by a second face (FFC2) of partition disk 15, and houses second inner rotor 16, second outer rotor 17, and a second portion of drive shaft 18.
  • the two pumping chambers (PP1), (PP2) are isolated hydraulically, as stated, by partition disk 15.
  • CND1 common intake conduit
  • PP2 pumping chambers
  • PP3 pumping chambers
  • CND2 delivery conduits
  • CND3 delivery conduits
  • intake conduit (CND1) branches off into a first portion (PZ1) ( Figure 4 ) on the pump body 11 side, and a second portion (PZ2) on the cover 12 side.
  • a first delivery conduit (CND2) is formed in pump body 11, and a second delivery conduit (CND3) in cover 12.
  • the delivery conduits (CND2), (CND3) may be connected by an inner channel (TB) connected to a further inner return channel (CND4) which may be parallel-connected to a relief valve (VVM).
  • VVM relief valve
  • An intermediate conduit (CND5) connects inner return channel (CND4) hydraulically to intake conduit (CND1).
  • VVM relief valve
  • partition disk 15 is replaced by a contoured disk 150, again located between the two pumping chambers (PP1), (PP2).
  • contoured disk 150 has a first intake opening 152 and a second delivery opening 151 hydraulically connecting the two pumping chambers (PP1), (PP2).
  • Contoured disk 150 also has a through hole (FP4) fitted through, in use, with drive shaft 18.
  • the two faces (FFC3) and (FFC4) of contoured disk 150 may have grooves and/or slits and/or dead cavities by which to produce preferential paths and/or variations in speed and pressure in the oil flow inside the two pumping chambers (PP1), (PP2).
  • Each end point (P1), (P2) of second opening 152 of contoured disk 150 has a projection (ELl), (EL2).
  • the two projections (ELl), (EL2) are fixed to the wall of cavity (CV) ( Figure 1 ) in pump body 11 ( Figure 1 ).
  • contoured disk 150 must obviously be fixed to the wall of cavity (CV) to prevent the contoured disk from rotating, and to ensure correct positioning of first intake opening 152 and second delivery opening 151.
  • the main advantage of the gerotor pump according to the present invention is that of providing a pump with extremely thick lobed rotors (and therefore high flow) while at the same time reducing vibration and the noise level of the pump.
  • the present invention was conceived precisely to eliminate these drawbacks, by cutting the inner rotor (and possibly also the outer rotor) into at least two portions along a plane perpendicular to the axis of rotation of the inner rotor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
EP09174909A 2008-11-13 2009-11-03 Pompe à engrenages internes Withdrawn EP2187057A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000686A ITBO20080686A1 (it) 2008-11-13 2008-11-13 Pompa di tipo gerotor

Publications (1)

Publication Number Publication Date
EP2187057A1 true EP2187057A1 (fr) 2010-05-19

Family

ID=40910024

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09174909A Withdrawn EP2187057A1 (fr) 2008-11-13 2009-11-03 Pompe à engrenages internes

Country Status (3)

Country Link
US (1) US20100119398A1 (fr)
EP (1) EP2187057A1 (fr)
IT (1) ITBO20080686A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10436082B2 (en) 2015-02-03 2019-10-08 Man Truck & Bag Ag Method for operating a gear pump, and gear pump

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2458237C1 (ru) * 2011-04-26 2012-08-10 Открытое акционерное общество "Научно-производственное объединение "Сатурн" (ОАО "НПО "Сатурн") Авиационный газотурбинный двигатель
CN102537632A (zh) * 2012-03-13 2012-07-04 浙江吉利汽车研究院有限公司 可变排量转子机油泵
US9624929B2 (en) * 2012-12-21 2017-04-18 Lg Innotek Co., Ltd. Electric pump
CN106051441B (zh) * 2016-08-03 2018-07-31 湖南机油泵股份有限公司 一种输出排量可变双联转子泵及其控制系统
CN106015900A (zh) * 2016-08-03 2016-10-12 湖南机油泵股份有限公司 一种齿轮式机油泵
CN106090589A (zh) * 2016-08-03 2016-11-09 湖南机油泵股份有限公司 一种转子式机油泵
KR102012215B1 (ko) * 2017-11-30 2019-10-21 현대 파워텍 주식회사 자동변속기용 오일 펌프
CN114017158A (zh) * 2021-11-24 2022-02-08 中国航发沈阳发动机研究所 一种降低航空滑油泵供油波动的方法及航空滑油泵
DE102022206319A1 (de) * 2022-06-23 2023-12-28 Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg Elektrische Zahnradpumpe für ein Kraftfahrzeug, insbesondere Gerotor-Pumpe sowie Set aus mehreren Zahnradpumpen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1648730A (en) * 1926-12-18 1927-11-08 Hill Compressor & Pump Company Rotary pumping machine
US3244111A (en) * 1965-09-14 1966-04-05 Dura Corp Dual pump
US5797734A (en) * 1996-11-26 1998-08-25 Chrysler Corporation Pump for hot and cold fluids
GB2354499A (en) 1999-09-21 2001-03-28 Sauer Danfoss A hydraulic control arrangement for a power steering system
WO2001053724A1 (fr) * 2000-01-20 2001-07-26 Eagle-Picher Industries, Inc. Pompe a rotor dente double pour transmission automatique
DE102005053921A1 (de) 2004-12-03 2006-06-08 Hitachi, Ltd. Tandem-Trochoidpumpe und Verfahren zum Montieren derselben
WO2006134337A1 (fr) 2005-06-11 2006-12-21 Concentric Vfp Ltd Pompe à débit variable
GB2443089A (en) * 2006-10-18 2008-04-23 Concentric Vfp Ltd Split rotor variable output gerotor pump
GB2443088A (en) * 2006-10-18 2008-04-23 Concentric Vfp Ltd Gerotor pump with filling axial rotor slot.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4245575A (en) * 1979-07-16 1981-01-20 Union Special Corporation Lubrication system for sewing machine
US4519755A (en) * 1980-05-09 1985-05-28 Sargent-Welch Scientific Company Gerotor vacuum pump
US20060161616A1 (en) * 2005-01-14 2006-07-20 I Anson Colin Provision of services over a common delivery platform such as a mobile telephony network

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1648730A (en) * 1926-12-18 1927-11-08 Hill Compressor & Pump Company Rotary pumping machine
US3244111A (en) * 1965-09-14 1966-04-05 Dura Corp Dual pump
US5797734A (en) * 1996-11-26 1998-08-25 Chrysler Corporation Pump for hot and cold fluids
GB2354499A (en) 1999-09-21 2001-03-28 Sauer Danfoss A hydraulic control arrangement for a power steering system
WO2001053724A1 (fr) * 2000-01-20 2001-07-26 Eagle-Picher Industries, Inc. Pompe a rotor dente double pour transmission automatique
DE102005053921A1 (de) 2004-12-03 2006-06-08 Hitachi, Ltd. Tandem-Trochoidpumpe und Verfahren zum Montieren derselben
WO2006134337A1 (fr) 2005-06-11 2006-12-21 Concentric Vfp Ltd Pompe à débit variable
GB2443089A (en) * 2006-10-18 2008-04-23 Concentric Vfp Ltd Split rotor variable output gerotor pump
GB2443088A (en) * 2006-10-18 2008-04-23 Concentric Vfp Ltd Gerotor pump with filling axial rotor slot.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"INNENZAHNRADPUMPEN QXV ...FUER NIEDERVISKOSE FLUESSIGKEITEN", O + P OLHYDRAULIK UND PNEUMATIK, VEREINIGTE FACHVERLAGE, MAINZ, DE, vol. 47, no. 10, 1 October 2003 (2003-10-01), pages 632/633, XP001046672, ISSN: 0341-2660 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10436082B2 (en) 2015-02-03 2019-10-08 Man Truck & Bag Ag Method for operating a gear pump, and gear pump

Also Published As

Publication number Publication date
ITBO20080686A1 (it) 2010-05-14
US20100119398A1 (en) 2010-05-13

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