EP2538082B1 - Pompe à engrenages avec un volume de pompage variable - Google Patents

Pompe à engrenages avec un volume de pompage variable Download PDF

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Publication number
EP2538082B1
EP2538082B1 EP12169014.3A EP12169014A EP2538082B1 EP 2538082 B1 EP2538082 B1 EP 2538082B1 EP 12169014 A EP12169014 A EP 12169014A EP 2538082 B1 EP2538082 B1 EP 2538082B1
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EP
European Patent Office
Prior art keywords
cover
chamber
gear pump
base part
lid
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
EP12169014.3A
Other languages
German (de)
English (en)
Other versions
EP2538082A2 (fr
EP2538082A3 (fr
Inventor
Guenther Vogt
Uwe Hammer
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2538082A2 publication Critical patent/EP2538082A2/fr
Publication of EP2538082A3 publication Critical patent/EP2538082A3/fr
Application granted granted Critical
Publication of EP2538082B1 publication Critical patent/EP2538082B1/fr
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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
    • 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
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F04C14/265—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels being obtained by displacing a lateral sealing face
    • 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

Definitions

  • the invention relates to a gear pump with a housing having a chamber in which two intermeshing gears are each mounted rotatably mounted, wherein the housing has a leading into the chamber inlet and an outgoing from the chamber drain for the medium to be delivered.
  • liquid urea solution To promote the liquid urea solution is usually an electrically driven feed pump, for example in the manner of a diaphragm pump used.
  • an electrically driven feed pump for example in the manner of a diaphragm pump used.
  • liquid media especially for liquid urea solution, there is the problem that they freeze at low temperatures, for example, of about -12 ° C in the urea solution, resulting in an increase in volume of the medium.
  • the delivery pump must be able to withstand or compensate for this volume increase without being damaged. For membrane pumps, this can be done through the membrane itself.
  • the US 4 253 803 A describes a gear pump with adjustable delivery pressure.
  • the US 2007/0140886 A1 discloses a fluid pump with improved efficiency and also variable fluid pressure.
  • the gear pump according to the invention has the advantage that it has an effective ice pressure protection and thus is protected at low temperatures below the freezing point of the medium to be conveyed before the freezing medium and the resulting ice pressure.
  • the gear pump in principle has a higher performance, so that it is now possible everywhere where previously provided the diaphragm pump for ice protection reasons, provide the gear pump according to the invention, which is characterized by the features of claim 1.
  • a cover which delimits the chamber, in particular at the end is displaceable at least in regions to increase the chamber volume. Under the frontal boundary of the chamber through the cover is in this case to understand such a cover, which is aligned substantially parallel to the end faces of the gears.
  • the cover As soon as the pressure in the chamber exceeds a critical value or the preload pressure due to a too high rotational speed of the gears, the cover is displaced, whereby the chamber volume is increased.
  • the cover is designed and / or arranged such that the pressure side connected by the displacement with the suction side of the gear pump or the chamber and thus a bypass is generated, which serves to reduce the pressure or to the delivery pressure.
  • the cover is held by a stop of the housing spaced from the gears.
  • the housing thus has a stop on which the cover rests normally, and is thus always kept at a minimum distance from the gears. This ensures that no friction occurs between the gears and the cover, which could lead to wear of the gears or damage to the cover.
  • the recess is particularly preferably stepped, so that it forms a full-circumference stop or a stop shoulder on which the cover in particular rests flatly on its edge region.
  • the displaceable cover extends over the suction region and the pressure region of the chamber. In this way - as already mentioned - achieved that when the cover is displaced due to a correspondingly high pressure in the chamber, a kind of bypass channel is formed, which allows a pressure equalization between pressure range and suction.
  • the housing has a lid which carries the cover and a base part which carries the toothed wheels in a recess.
  • the housing is thus formed at least in two parts, wherein a part has the recess in which the gear wheels eino, and thus substantially forms the chamber.
  • the remaining part of the housing is formed by the lid, which has the chamber limiting cover.
  • the cover is expediently arranged on the base or base part such that the cover partially projects into the recess.
  • the recess has a height which exceeds the height of the gears so far that, even if the cover is displaced, it is not moved out of the recess.
  • the cover is fastened or fastened to the base part in such a way that the cover does not come off the base part even when correspondingly high pressure forces occur in the chamber.
  • the lid can be screwed to the base part, for example, clamped and / or glued.
  • the cover can be latched to the base part, whereby a particularly simple assembly is ensured.
  • the cover and / or the base part preferably have at least one latching lug, which cooperates with a latching recess of the base part or the cover.
  • the locking lug and / or the recess having material portion elastically deformable, so that latching lug and recess are pushed or plugged together in a rear grip position can be brought.
  • a snap connection is produced, which in particular is also detachable again.
  • the spring force of the spring element acts expediently at the same time as a fastening force which urges the cover into the rear grip seat, so that the latching is acted upon by a bias, which ensures a secure and tight grip of the lid on the base part.
  • At least one sealing element in particular a sealing ring or O-ring, is arranged between the cover and the cover or the base part.
  • the sealing element is expediently designed such that it allows a relative movement on at least one sealing surface and even then sealingly closes when the pressure in the chamber exceeds the critical pressure.
  • FIG. 1 shows in a simplified longitudinal sectional view of a gear pump 1, as used in motor vehicles, in particular for conveying a liquid medium.
  • the present gear pump 1 serves to convey a liquid exhaust gas aftertreatment agent, which in particular is urea-containing.
  • the recess 8 has two axial sections, of which the first, inner axial section 17 has a first diameter and the second, further outward has a second, larger diameter, so that ultimately a stepped recess 8 is present.
  • the first axial section 17 has a height which corresponds at least to the height of the gears 9 and 10.
  • FIG. 2 represents a simplified plan view of the base part of the gear pump 1 with the cover 4 removed
  • the housing 2 has an inlet 21 through which the liquid medium can flow into the chamber 20, and a drain 22 through which the hydraulic medium through the driven gears 9 and 10 is fed out of the chamber 20, as indicated by arrows.
  • the inlet 21 thus opens into the suction side S and the outlet 22 into the pressure side P of the chamber 20th
  • the cover 19 is raised to increase the volume of the chamber 8, whereby, as the cover 19 extends over the entire chamber 20, a connection between the pressure side P and the suction side S is generated. This has the consequence that the pressure on the pressure side can not increase further.
  • the generated by the lifting of the cover 19 by-pass between the pressure side P and suction side S leads to a pressure equalization between the two sides.
  • the cover plate 19 is in the normal state with its outer edge region on a stop 25 partially flat, which is formed by the stepped formation of the recess 8.
  • a groove 26 is formed in the surface of the stopper 25, as in FIG. 2 is shown.
  • the groove 26 extends substantially over the entire circumference of the stopper 25 and fluidly communicates with the pressure side P of the chamber 20 so that the medium in the groove has the pressure of the pressure side P.
  • the cover 19 is uniformly acted upon over its circumference with the pressure of the pressure side P, and thereby takes place a uniform lifting of the cover 19 of the stop 25.
  • the pressure limiting function of the cover 19 is further improved.
  • the height of the first axial portion 17 is selected to be slightly higher than that of the gears 9, 10, so that a small or small gap between the gears 9, 10 and the cover 19 is present in order to avoid friction during operation.
  • the cover 19 has in its outer shell surface a groove 27 extending over the entire circumference, in which a sealing ring 28 rests.
  • the sealing ring 28 rests both on the bottom of the groove 27 and on the inside of the second axial portion 18 of the base part 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (6)

  1. Pompe à engrenages (1) comprenant un boîtier (2) qui présente une chambre (20) dans laquelle sont disposées, de manière à chaque fois supportée à rotation, deux roues dentées (9, 10) s'engrenant l'une avec l'autre, le boîtier (2) présentant au moins une entrée (21) conduisant à la chambre (20) ainsi qu'au moins une sortie (22) sortant de la chambre (20), un recouvrement (19) limitant la chambre (20) du côté frontal, qui s'étend au moins depuis un côté aspiration (S) jusqu'à un côté refoulement (P), pouvant être déplacé au moins en partie pour augmenter le volume de la chambre, le recouvrement (19) étant associé à au moins un élément de ressort (23) qui sollicite le recouvrement (19) avec une force de ressort dans la direction des roues dentées (9, 10), le recouvrement (19) étant retenu à distance des roues dentées (9, 10) par une butée (25) située sur toute la périphérie du boîtier (2), caractérisée en ce que la butée (25) présente une rainure (26) s'étendant sur toute sa périphérie, laquelle est réalisée sous forme ouverte vers le recouvrement (19) et est en liaison fluidique avec le côté de refoulement (P) de la chambre (20).
  2. Pompe à engrenages selon la revendication 1, caractérisée en ce que le recouvrement (19) peut être déplacé axialement.
  3. Pompe à engrenages selon l'une quelconque des revendications précédentes, caractérisée en ce que le boîtier (2) présente un couvercle (4) portant le recouvrement (19) et une partie de base (3) portant les roues dentées (9, 10) dans un renfoncement (8).
  4. Pompe à engrenages selon la revendication 3, caractérisée en ce que le couvercle (4) peut être encliqueté sur la partie de base (3).
  5. Pompe à engrenages selon la revendication 3 ou 4, caractérisée en ce que le couvercle (4) et/ou la partie de base (3) présentent au moins un ergot d'encliquetage (6) qui coopère avec un évidement d'encliquetage (7) de la partie de base (3), respectivement du couvercle (4).
  6. Pompe à engrenages selon l'une quelconque des revendications 3, 4 ou 5, caractérisée en ce que sur le côté de la partie de base (3) opposé au couvercle (4) est disposé un dispositif d'entraînement, en particulier un moteur électrique (14) pour au moins l'une des roues dentées (10).
EP12169014.3A 2011-06-22 2012-05-23 Pompe à engrenages avec un volume de pompage variable Active EP2538082B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011077949A DE102011077949A1 (de) 2011-06-22 2011-06-22 Zahnradpumpe

Publications (3)

Publication Number Publication Date
EP2538082A2 EP2538082A2 (fr) 2012-12-26
EP2538082A3 EP2538082A3 (fr) 2015-04-08
EP2538082B1 true EP2538082B1 (fr) 2018-07-11

Family

ID=46168217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12169014.3A Active EP2538082B1 (fr) 2011-06-22 2012-05-23 Pompe à engrenages avec un volume de pompage variable

Country Status (2)

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EP (1) EP2538082B1 (fr)
DE (1) DE102011077949A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3013762B1 (fr) * 2013-11-27 2017-07-21 Inergy Automotive Systems Res (Societe Anonyme) Pompe pour additif
DE102013225938A1 (de) 2013-12-13 2015-06-18 Robert Bosch Gmbh Fördermodul
DE102015010997A1 (de) * 2015-08-21 2017-03-09 Bernd Niethammer Exzenterpumpe, insbesondere Förderpumpe für wässrige Harnstofflösungen, und Fördervorrichtung mit einer Exzenterpumpe
US10018083B2 (en) 2015-10-15 2018-07-10 GM Global Technology Operations LLC Lubricating fluid system for a vehicle with self compensation plate
DE102016202260A1 (de) * 2016-02-15 2017-08-17 Bühler Motor GmbH Pumpenantrieb für die Förderung eines Reduktionsmittels für Kfz-Abgasanlagen, modulare Motor- und Pumpenfamilie zur Bildung unterschiedlicher Pumpenantriebe mit mehreren solcher Elektromotoren
DE102016103051A1 (de) * 2016-02-22 2017-08-24 Gkn Sinter Metals Engineering Gmbh Pumpenanordnung
ITUB201655126U1 (it) * 2016-03-02 2017-09-02 Fluid O Tech Srl Assieme di contenimento elastico per una pompa.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5417556A (en) * 1994-03-08 1995-05-23 Alliedsignal Inc. Bearing for gear pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2642001A (en) * 1950-01-25 1953-06-16 Bump Pump Co Pump by-passing assemblage
NL169509C (nl) * 1978-02-07 1982-07-16 Fuelmaster Prod Nv Roterende pomp.
US7438542B2 (en) * 2005-12-19 2008-10-21 Dana Automotive Systems Group, Llc. Fluid pump assembly
DE102008003843A1 (de) * 2008-01-10 2009-07-16 Robert Bosch Gmbh Förderaggregat

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5417556A (en) * 1994-03-08 1995-05-23 Alliedsignal Inc. Bearing for gear pump

Also Published As

Publication number Publication date
EP2538082A2 (fr) 2012-12-26
DE102011077949A1 (de) 2012-12-27
EP2538082A3 (fr) 2015-04-08

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