EP3904687A1 - Pompe à engrenages - Google Patents

Pompe à engrenages Download PDF

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Publication number
EP3904687A1
EP3904687A1 EP20171681.8A EP20171681A EP3904687A1 EP 3904687 A1 EP3904687 A1 EP 3904687A1 EP 20171681 A EP20171681 A EP 20171681A EP 3904687 A1 EP3904687 A1 EP 3904687A1
Authority
EP
European Patent Office
Prior art keywords
gear
lubrification
gear pump
pump according
sealing surface
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.)
Granted
Application number
EP20171681.8A
Other languages
German (de)
English (en)
Other versions
EP3904687B1 (fr
Inventor
Claudio BONAFEDE
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.)
Maag Pump Systems AG
Original Assignee
Maag Pump Systems AG
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 Maag Pump Systems AG filed Critical Maag Pump Systems AG
Priority to EP20171681.8A priority Critical patent/EP3904687B1/fr
Priority to PCT/EP2021/060475 priority patent/WO2021219471A1/fr
Publication of EP3904687A1 publication Critical patent/EP3904687A1/fr
Application granted granted Critical
Publication of EP3904687B1 publication Critical patent/EP3904687B1/fr
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
    • 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
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
    • 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
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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
    • F04C15/0088—Lubrication

Definitions

  • the current invention relates to gear pumps, in particular to spur-toothed external gear pumps that are easy to maintain and easy to clean after a pumping process.
  • gear pumps have a pump housing, in which a drive gear and an idler gear are rotatably mounted.
  • the housing is laterally closed off on one side with a flange and on the opposite side thereof is closed off with a cover.
  • the flange comprising a drive shaft and a coupling piece, by means of which the drive shaft is operatively connected to the drive gear.
  • a gear pump is disclosed in CN 105298834 .
  • Such a known gear pump has the disadvantage of comprising a rather high number of spare parts resulting in high maintenance costs.
  • a problem to be solved is the provision of a gear pump that is easy to maintain.
  • a gear pump comprises a housing with a spur-toothed drive gear and a spur-toothed idle gear that are mounted rotatably around two parallel rotation axes within the housing with bushings.
  • a connecting flange is arranged on a first lateral side of the housing, in the direction of the axes.
  • a cover is arranged on a second lateral side of the housing, opposite the connecting flange.
  • a drive shaft is rotatably mounted in the connecting flange by at least one bearing and is sealed against the connecting flange by at least one shaft seal, wherein the drive shaft is operatively connected to the drive gear by a coupling piece.
  • the drive gear and the idle gear are identical.
  • the gear pump can be taken apart individually, upon requirement, i.e. the seals can be replaced without removing the gears, or the gears can be replaced without removing the seals. Additionally, fewer spare parts are needed as the drive gear and the idle gear are interchangeable.
  • each gear comprises a first bearing pin arranged on a first lateral side of the gear and a second bearing pin arranged on a second lateral side of the gear, opposite to the first lateral side.
  • the axis of rotation of the bearing pins are congruent and the length and the diameter of the bearing pins are identical.
  • the first bearing pin comprises an internal driving profile.
  • the first bearing pin and the second bearing pin comprise an internal driving profile.
  • the driving profile is part of a form-fit shaft-hub connection with a shaft selected from the group comprising polygon shaft, toothed shaft, splined shaft and cycloidal shaft.
  • a shaft selected from the group comprising polygon shaft, toothed shaft, splined shaft and cycloidal shaft.
  • any regular or irregular profile can be used that can act as a driving profile.
  • a lubrification channel extends along the axis of rotation through each gear, from the first bearing pin to the second bearing pin, i.e. through the entire length of each gear.
  • the drive shaft extends along a longitudinal axis from a first end to a second end.
  • the second end of the drive shaft comprises a driving profile.
  • the driving profile of the drive shaft is identical to the driving profile of the gears, i.e. they all are either internal driving profiles or external profiles with identical cross-sections.
  • a lubrification channel extends along the longitudinal axis of the drive shaft, at least in the region of the second end.
  • the lubrification channel has a lateral opening spaced apart from the second end of the drive shaft.
  • the first end of the drive shaft comprises a connecting profile for the connection to a drive element.
  • the connecting profile acting as a driving profile is part of a form-fit shaft-hub connection with a shaft selected from the group comprising polygon shaft, toothed shaft, splined shaft and cycloidal shaft.
  • any regular or irregular profile can be used that can act as a driving profile.
  • the coupling piece extends along a longitudinal axis and comprises a driving profile over its entire length that is complementary to the driving profile of the gears or the driving profile of the drive shaft, respectively.
  • the driving profile of the gears or the drive shaft is an internal profile
  • the driving profile of the coupling piece is an external profile and vice versa. Therefore, if the drive gear comprises an internal drive profile and the drive shaft comprises an external drive, the coupling piece comprises an external driving profile on its one side and an internal driving profile on its other side.
  • a lubrification channel extends along the longitudinal axis over the entire length of the coupling piece.
  • a first sealing surface of the housing faces a sealing surface of the connecting flange
  • a second sealing surface of the housing faces a sealing surface of the cover.
  • the end faces of the first bearing pin of the drive gear and of the idle gear and the outside end faces of the corresponding bushes are flush with the first sealing surface.
  • the end faces of the second bearing pin of the drive gear and of the idle gear and the outside end faces of the corresponding bushes are flush with the second sealing surface.
  • the sealing surface of the connecting flange comprises a sealing groove surrounding the corresponding bushes and comprises a first sealing ring.
  • the sealing surface of the cover comprises a sealing groove surrounding the corresponding bushes and comprises a second sealing ring.
  • the connecting flange comprises a seal cover that is removable from a side opposite the housing.
  • the at least one bearing, the at least one shaft seal and the drive shaft are securely arranged in a recess in the seal cover. This design allows for the exchange of the shaft seal of the drive shaft without the need to disassemble the gear pump otherwise.
  • the sealing surface of the connecting flange comprises a lubrification groove for connecting the lubrification channel of the idle gear with a lubrification port adjacent to the drive shaft and the sealing surface of the cover comprises a lubrification groove for connecting the lubrification channel of the drive gear with the lubrification channel of the idle gear.
  • the lubrification groove of the connecting flange extends from a region comprising the projection of the lubrification channel of the idle gear in the direction of the axis of rotation and the lubrification groove of the cover extends from a region comprising the projection of the lubrification channel of the drive gear in the direction of the axis of rotation to a region comprising the projection of the lubrification channel of the idle gear in the direction of the axis of rotation.
  • the gear pump comprises a lubrification channel insert that extends along a longitudinal axis and comprising a driving profile over its entire length that is complementary to the driving profile of the idle gear and a lubrification channel that extends along the longitudinal axis over the entire length of the lubrification insert.
  • the length of the lubrification channel insert is identical to the length of a recess in the idle gear comprising the driving profile and an adjoining undercut for the driving profile. If the lubrification channel insert is introduced in said recess, the lubrification channel of the lubrification channel insert connects the lubrification channel of the idle gear to the lubrification groove of the connecting flange.
  • the housing is clamped between the connecting flange and the cover by means of clamping elements.
  • Fig. 1 shows a perspective exploded view of a gear pump according to the present invention
  • Fig. 2 shows an alternative view of the exploded view of Fig. 1 .
  • the gear pump comprises a housing 1 with a spur-toothed drive gear 4 and a spur-toothed idle gear 5 that are mounted rotatably around two parallel rotation axes within the housing 1 comprising bushings 8.
  • a connecting flange 2 is arranged on a first lateral side of the housing 1 in the direction of the axes.
  • a cover 3 is arranged on a second lateral side of the housing 1, opposite the connecting flange 2.
  • a drive shaft 7 is rotatably mounted in the connecting flange 2.
  • the housing 1 comprises a pressure port 10 and a suction port 11.
  • the housing 1 further comprises a first sealing surface 12 facing the connecting flange 2 and a second sealing surface 13 facing the cover 3. Through holes 14 extend from the first sealing surface 12 to the second sealing surface 13.
  • the connecting flange 2 comprises a sealing surface 20 facing the housing 1.
  • the sealing surface 20 comprises a lubrification groove 22 extending from a region of the rotation axis of the idle gear 5 to a location adjacent to the drive shaft 7.
  • the connecting flange 2 further comprises thread holes 23 that are distributed around the periphery of the sealing surface 20.
  • the connecting flange 2 further comprises a seal cover 24 that is removable from a side opposite the housing 1 and that is secured to the housing by means of screws.
  • the drive shaft 7 is rotatably arranged in the seal cover 24.
  • the cover 3 comprises a sealing surface 30 facing the housing 1.
  • the sealing surface 20 of the connecting flange 2 comprises a lubrification groove 22 extending from a region of the rotation axis of the drive gear 4 to a region of the rotation axis of the idle gear 5.
  • the cover 3 further comprises through holes 33 distributed around the periphery of the sealing surface 30 and extending from the sealing surface 30 through the entire thickness of the cover 3.
  • screws 34 extend through the through holes 33 of the cover 3 and the through holes 14 of the housing 1 and are screwed-in in the thread holes 23 of the connecting flange 2.
  • the housing 1 is clamped between the connecting flange 2 and the cover 3 by said screws 34.
  • the sealing surface 20 of the connecting flange 2 comprises a closed sealing groove 21 that surrounds the corresponding region of the end faces of the bushings 8 and a corresponding lubrification groove 22 in the sealing surface 20 of the connecting flange 2.
  • a first sealing ring 90 is arranged in said sealing groove 21 of the connecting flange 2.
  • the sealing surface 30 of the cover 3 comprises a closed sealing groove 31 that surrounds the corresponding region of the end faces of the bushings 8 und the corresponding lubrification groove 32 in the sealing surface 30 of the cover 3.
  • a second sealing ring 91 is arranged in said sealing groove 32.
  • Fig. 3 shows a sectional view of the gear pump of Fig. 1 .
  • the section being in a plane defined by the axis of rotation of the gears 4 and 5 and the drive shaft 7.
  • Both, the drive gear 4 and the idle gear 5, are rotatably arranged with bushings 8 within a recess in the housing 1.
  • the bushings 8 are arranged on both sides of each gear 4 and 5, respectively.
  • the recess extends along the axis of rotation of the gears 4 and 5 through the entire housing 1 from the first sealing surface 12 to the second sealing surface 13. This design allows the introduction or the removal of the gears 4 and 5 and the bushings 8 from either side of the recess.
  • There are bearing pins on both sides of the gears 4 and 5 which rest within the corresponding bushings 8.
  • a coupling piece 6 is partially introduced in a complementary recess in the drive gear 4. The rest of the coupling piece 6 extends over the first sealing surface 12 and into a complementary recess in the drive shaft 7.
  • the drive shaft 7 is rotatably mounted in the seal cover 24 of the connecting flange 2 with two bearings 80. The drive shaft 7 is sealed against the seal cover 24 with one shaft seal 9.
  • the drive shaft 7, the bearings 80 and the shaft seal 9 are secured in a recess in the seal cover 24 by means of a retaining element, i.e.
  • the seal cover 24 has a cylindrical husk body that is introduced into a corresponding recess of the flange body of the connecting flange 2.
  • the seal cover 24 comprises a brim that extends laterally over the diameter of the husk body. Through holes are evenly distributed around the circumference of the brim.
  • the seal cover 24 is fixed to the flange body by means of screws (see Fig. 1 ).
  • Fig. 4 shows a partial sectional view of a gear according to the present invention, i.e. the drive gear 4 or the idle gear 5.
  • the gear 4 comprises a gearing 40 located in its middle and extending in the direction of the axis of rotation A.
  • a first bearing pin 41 extends along the axis of rotation A having an outside diameter that is smaller than the outside diameter of the gearing 40 and having a length that is shorter than the width of the gearing 40.
  • a second bearing pin 42 is arranged on the opposite side of the gearing 40, having an outside diameter and a length that are identical to the ones of the first bearing pin.
  • a recess is provided centrically in the first bearing pin 41 extending from the end face.
  • the recess comprising a toothing 43 complementary to the one of the coupling piece 6 and an undercut adjoining the toothing 43.
  • a lubrification channel 44 extends along the axis of rotation A from the undercut towards the end face of the second bearing pin 42.
  • Fig. 5 shows a sectional view of a coupling piece 6 according to the present invention.
  • the coupling piece 6 has a cylindrical body that extends along a longitudinal axis L that comprises an external toothing 60 along its entire length that is complementary to the one of the drive gear 4 and the drive shaft 7.
  • a lubrification channel 61 extends along the longitudinal axis L over the entire length of the coupling piece 6.
  • Fig. 6 shows a partial sectional view of a drive shaft 7 according to the present invention.
  • the drive shaft 7 has a cylindrical body 70 that extends along a longitudinal axis L from a first end 71 to an opposite second end 72.
  • the first end 71 having an outside diameter that is smaller than the one of an adjoining middle section, and the outside diameter of the middle section is smaller than the one of the adjoining second end 71.
  • the outside diameter of the second end 71 is identical to the outside diameter of the bearing pins 41, 42 of the drive gear 4.
  • a recess is provided centrically in the second end 72 extending from the end face towards the middle section.
  • the recess comprising a gearing 73 complementary to the one of the coupling piece 6 and an undercut adjoining the gearing 73.
  • a lubrification channel 74 extends along the longitudinal axis L from the undercut into the middle section. From there, the lubrification channel 74 extends essentially perpendicular to the longitudinal axis L towards a lateral opening 740.
  • the diameter of the lubrification channel 74 of the drive shaft 7 is identical to the one of the coupling piece 6 and the gears 4, 5.
  • a connecting groove 75 in the form of a keyseat is provided at the first end 71.
  • gearing 1 housing 41 first bearing pin 10 pressure port 42 second bearing pin 11 suction port 43 gearing 12 first sealing surface 44 lubrification channel 13 second sealing surface 5 idle gear 14 through hole 6 coupling piece 2 connecting flange 60 gearing 20 sealing surface of the connecting flange 2 61 lubrification channel 7 drive shaft 21 sealing groove of the connecting flange 2 70 body 71 first end 22 lubrification groove 72 second end of the connecting flange 2 73 gearing 74 lubrification channel 23 thread hole 740 lateral lubrification opening 24 seal cover 3 cover 75 connecting groove 30 sealing surface of the cover 3 8 bushing 80 bearing 31 sealing groove of the cover 3 9 shaft seal 90 first sealing ring 32 lubrification groove of the cover 3 91 second sealing ring 33 through hole A axis of rotation 34 screw L longitudinal axis 4 drive gear

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
EP20171681.8A 2020-04-28 2020-04-28 Pompe à engrenages Active EP3904687B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20171681.8A EP3904687B1 (fr) 2020-04-28 2020-04-28 Pompe à engrenages
PCT/EP2021/060475 WO2021219471A1 (fr) 2020-04-28 2021-04-22 Pompe à engrenages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20171681.8A EP3904687B1 (fr) 2020-04-28 2020-04-28 Pompe à engrenages

Publications (2)

Publication Number Publication Date
EP3904687A1 true EP3904687A1 (fr) 2021-11-03
EP3904687B1 EP3904687B1 (fr) 2022-10-26

Family

ID=70470947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20171681.8A Active EP3904687B1 (fr) 2020-04-28 2020-04-28 Pompe à engrenages

Country Status (2)

Country Link
EP (1) EP3904687B1 (fr)
WO (1) WO2021219471A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023215168A1 (fr) * 2022-05-04 2023-11-09 Caterpillar Inc. Pompe avec bride pour montage de pompe auxiliaire

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1017382S1 (en) 2022-05-04 2024-03-12 Caterpillar Inc. Flange

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346761A (en) * 1940-04-25 1944-04-18 James P Johnson Hydraulic gear pump
DE1528959A1 (de) * 1965-02-12 1970-07-02 Bosch Gmbh Robert Verdraengermaschine
WO2000019067A2 (fr) * 1998-09-28 2000-04-06 Dana Corporation Systeme de graissage pour pompes hydrauliques
US7878781B2 (en) * 2007-12-11 2011-02-01 Hamilton Sundstrand Corporation Gear pump cavitation reduction
US20120267446A1 (en) * 2008-12-19 2012-10-25 Duerr Systems Gmbh Pump for delivering a fluid
CN105298834A (zh) 2015-11-16 2016-02-03 王建兴 一种能够用于正反转的外啮合齿轮泵
WO2018114797A1 (fr) * 2016-12-22 2018-06-28 Hove A/S Machine de distribution de boisson et pompe à engrenages associée

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5391068A (en) * 1994-02-15 1995-02-21 Eaton Corporation Gear pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346761A (en) * 1940-04-25 1944-04-18 James P Johnson Hydraulic gear pump
DE1528959A1 (de) * 1965-02-12 1970-07-02 Bosch Gmbh Robert Verdraengermaschine
WO2000019067A2 (fr) * 1998-09-28 2000-04-06 Dana Corporation Systeme de graissage pour pompes hydrauliques
US7878781B2 (en) * 2007-12-11 2011-02-01 Hamilton Sundstrand Corporation Gear pump cavitation reduction
US20120267446A1 (en) * 2008-12-19 2012-10-25 Duerr Systems Gmbh Pump for delivering a fluid
CN105298834A (zh) 2015-11-16 2016-02-03 王建兴 一种能够用于正反转的外啮合齿轮泵
WO2018114797A1 (fr) * 2016-12-22 2018-06-28 Hove A/S Machine de distribution de boisson et pompe à engrenages associée

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023215168A1 (fr) * 2022-05-04 2023-11-09 Caterpillar Inc. Pompe avec bride pour montage de pompe auxiliaire
US12366234B2 (en) 2022-05-04 2025-07-22 Caterpillar Inc. Pump having a flange for mounting an auxiliary pump

Also Published As

Publication number Publication date
EP3904687B1 (fr) 2022-10-26
WO2021219471A1 (fr) 2021-11-04

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