EP3808977B1 - Système hydraulique - Google Patents

Système hydraulique Download PDF

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Publication number
EP3808977B1
EP3808977B1 EP20197627.1A EP20197627A EP3808977B1 EP 3808977 B1 EP3808977 B1 EP 3808977B1 EP 20197627 A EP20197627 A EP 20197627A EP 3808977 B1 EP3808977 B1 EP 3808977B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
pump
arrangement according
tank
auxiliary pump
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
EP20197627.1A
Other languages
German (de)
English (en)
Other versions
EP3808977A2 (fr
EP3808977A3 (fr
Inventor
Michael Meid
Manuel Billich
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.)
Deere and Co
Original Assignee
Deere and Co
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Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Publication of EP3808977A2 publication Critical patent/EP3808977A2/fr
Publication of EP3808977A3 publication Critical patent/EP3808977A3/fr
Application granted granted Critical
Publication of EP3808977B1 publication Critical patent/EP3808977B1/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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/021—Pumping installations or systems having reservoirs the pump being immersed in the reservoir
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/20—Filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/047—Preventing foaming, churning or cavitation

Definitions

  • the invention relates to a hydraulic arrangement with a working pump for delivering a hydraulic medium in the direction of a hydraulic work load.
  • a suction strainer is often hydraulically connected to the working pump on the inlet side in order to keep unwanted particles away from the working pump and from the hydraulic lines connected to the working pump.
  • the suction strainer can create a pressure drop that may affect the suction pressure at the inlet side of the working pump.
  • the hydraulic arrangement comprises a working pump for delivering a hydraulic medium (eg oil) in the direction of a hydraulic work load, which acts as a hydraulic consumer. Furthermore, the hydraulic arrangement has a hydraulic tank and an auxiliary pump.
  • the hydraulic tank has a tank outlet for a hydraulic connection of the input side of the working pump, so that the working pump is hydraulically connected to the hydraulic tank on the input side.
  • the auxiliary pump is stored in the hydraulic tank and causes a hydraulic flow in the direction of the tank outlet depending on a controller (eg an associated electric drive).
  • the auxiliary pump can be activated as required using the controller.
  • the auxiliary pump can therefore, for example, compensate for an undesired drop in pressure on the input side of the working pump by actively pumping hydraulic medium in the direction of the tank outlet when a corresponding drop in pressure is detected at the working pump.
  • the auxiliary pump can actively support the working pump in the manner of a charging function if the latter sucks in the hydraulic medium that is not yet at operating temperature in the cold start phase. In this way, any excessively low suction pressures at the inlet of the working pump can be avoided in a targeted manner with the auxiliary pump.
  • auxiliary pump can ensure in a technically simple manner that, on the one hand, undesired particles and other foreign bodies are reliably kept away from the working pump and, on the other hand, suction pressures that are too low are reliably avoided.
  • the working pump is designed, for example, as a self-priming pump.
  • the working pump is designed as an axial piston pump, vane pump or gear pump.
  • the operation of the auxiliary pump is preferably controlled as a function of at least one detected physical variable of the working pump and/or the hydraulic medium and/or the auxiliary pump and/or a vehicle system and/or the environment. This control enables the auxiliary pump to be operated as required, as a result of which the latter can be operated very efficiently and in an energy-saving manner within the hydraulic arrangement.
  • the physical variables are recorded or determined in particular by a suitable sensor system.
  • the sensor signals can be processed in a suitable control unit, eg compared with predefined threshold values.
  • Control signals for controlling the electric drive of the auxiliary pump can be derived from the processing or comparison result.
  • individual sensor signals can be used to provide information to a display unit controlled by the control unit (eg optically and/or acoustically). regarding a necessary oil change.
  • service and maintenance intervals can be individually adapted to the actual operating condition of the hydraulic arrangement. The maintenance work on the hydraulic arrangement can thus be carried out in a more demand-oriented and cost-saving manner.
  • a detection or measurement of the pump current of an electrically driven auxiliary pump can be used to indirectly determine the degree of loading of a filter unit which is hydraulically connected to the auxiliary pump on the output side and through which the hydraulic medium flows.
  • the already mentioned control unit and the display unit controlled by it can in turn signal that this filter unit needs to be replaced.
  • Energy-saving operation of the auxiliary pump is further supported by being driven by an electric motor.
  • This electric motor in turn, can be controlled very precisely and efficiently by the control unit explained above, if required.
  • the electric pump drive can be installed in a very space-saving manner within the hydraulic arrangement, in particular within the hydraulic tank, and this supports a compact structure for the entire arrangement.
  • a delivery channel through which the hydraulic medium can flow is hydraulically interposed between the tank outlet and a pump outlet of the auxiliary pump.
  • the auxiliary pump pumps in its activated Condition of hydraulic medium through the delivery channel.
  • the conveying channel can be used to influence the hydraulic medium flowing through in such a way that the operating behavior of the working pump is supported.
  • the delivery channel is arranged at least partially or completely within the hydraulic tank. This supports a compact, space-saving construction of the hydraulic arrangement. Their installation in an agricultural vehicle or other mobile hydraulic application is correspondingly easier to install and more cost-effective.
  • the conveying channel has a heat exchanger through which hydraulic medium can flow.
  • the heat exchanger is liquid-cooled and a corresponding cooling liquid flows through it on the secondary side.
  • the heat exchanger can be used to heat or cool the hydraulic medium.
  • the heat exchanger contributes to a further improved operating behavior of the working pump.
  • the conveying channel preferably has a filter unit through which hydraulic medium can flow, for filtering undesired particles and other foreign bodies that impair the hydraulic medium and thus also the hydraulic circuit.
  • the filter unit represents a bypass flow filter.
  • the filter unit is designed in particular as a fine filter (eg filter element made of cellulose, microfiber) with a particularly fine-meshed filter surface. This makes possible a correspondingly coarser-meshed dimensioning of a return filter, which is installed in the hydraulic circuit after the hydraulic work load in the return side of the hydraulic arrangement.
  • the coarser-meshed dimensioning reliably avoids any undesired pressure losses in the hydraulic arrangement in the area of the return filter, as a result of which the efficiency and the hydraulic operating behavior of the hydraulic arrangement are further improved.
  • the conveying channel has a suction screen. Due to the already explained technical effect and advantages of the auxiliary pump, even a relatively finely sized suction strainer, e.g.
  • the suction strainer is arranged along the direction of flow in the hydraulic tank, in particular directly in front of the tank outlet and is hydraulically connected there to the tank outlet.
  • the hydraulic arrangement is used in mobile hydraulics, for example in agricultural utility vehicles (in particular tractors, tractors), construction machines or road construction vehicles.
  • the hydraulic work load is accordingly preferably contained in one of the aforementioned mobile machines or vehicles.
  • the hydraulic working load can be designed, for example, as a steering or braking unit, hydraulic motor or power lift cylinder.
  • the hydraulic arrangement or the hydraulic circuit containing it can be operated in a commercial vehicle, in particular as a hydraulic circuit separate from the vehicle transmission. In this way, the transmission hydraulics can be reliably protected against any contamination from the working load hydraulics.
  • FIG. 1 shows a hydraulic arrangement 10 or a hydraulic circuit with a working pump 12 for pumping a hydraulic medium (e.g. oil) in the direction of a hydraulic working load 14.
  • a hydraulic medium e.g. oil
  • the working pump 12 is hydraulically connected with a suction line 16 to a tank outlet 18 of a hydraulic tank 20 or sump containing the hydraulic medium.
  • the drive of the working pump 12 can be in the usual be derived from a vehicle drive system in the form of a drive motor in a manner not shown in detail here.
  • the hydraulic system 10 located in an agricultural utility vehicle also has an auxiliary pump 22 that can be driven electrically by means of an electric motor EM.
  • This is located with an intake line 24 in the hydraulic tank 20.
  • the auxiliary pump 22 can be activated as required and then bring about a hydraulic flow 26 in the direction of the tank outlet 18.
  • the auxiliary pump 22 is activated as required by means of a control unit 28 which controls the electric motor EM.
  • the control unit 28 is connected to the electric motor EM via a control line 30 .
  • the corresponding control signals S are generated by the control unit 28 as a function of the detection and processing of at least one specific physical variable. In the embodiment according to 1 several physical variables are provided.
  • a pressure sensor 32 detects an intake pressure p_s on the working pump 12 on the inlet side.
  • a current temperature T_h of the hydraulic medium is recorded.
  • At least one further variable X_h representing the state of the hydraulic medium is recorded and transmitted to the control unit 28 .
  • the control unit receives further sensor data from the bus system of the vehicle, such as a coolant temperature T_k of the vehicle drive system and an ambient temperature T_u. Determined from the data of the recorded physical variables the control unit 28 whether and for how long the auxiliary pump 22 must be activated and sends the corresponding control signals S.
  • the data of the detected variables or measures derived therefrom are sent from the control unit 28 to a display unit 34 that can be seen by the driver or user.
  • the latter can signal the driver or user optically and/or acoustically which measures are automatically carried out by the control unit 28 with regard to the auxiliary pump 22 .
  • states of the hydraulic system 10 derived from the detected variables can be signaled.
  • a degree of loading of a filter unit located in the hydraulic tank 20 for cleaning the hydraulic medium can also be derived from the detected pump current I_p and signaled by means of the display unit 34 .
  • a recommended or necessary filter change can be signaled on the basis of the display unit 28 in connection with the determined degree of loading.
  • a delivery channel 38 through which hydraulic medium can flow is hydraulically interposed.
  • this conveying channel 38 is shown only schematically as a block diagram.
  • a preferred embodiment of the conveying channel 38 is shown. This consists essentially of an arrangement of several components, namely a heat exchanger 40 located closest to the pump outlet 36, a filter unit 42 connected thereto and a suction strainer 44 connected to the filter unit 42.
  • a coolant 46 flows through the heat exchanger 40 on the secondary side.
  • the associated cooling lines 48 are only partially indicated here.
  • the filter unit 42 preferably includes a filter element 50 having a star-pleated filter material.
  • an axial output of the suction strainer 44 is hydraulically connected to the tank output 18.
  • a return filter 54 is installed in the area of a return side 52 of the hydraulic arrangement 10 . With regard to its filter effect, this can be dimensioned relatively roughly, since the existing filter unit 42 already assumes a certain filter effect. Undesirable pressure drops at the return filter 54 can be reliably avoided as a result.
  • the sensors 56 sends the sensor signals to the control unit 28.
  • individual Sensors or the entire sensor system 56 other locations, in particular outside of the conveyor channel 38 or outside of the hydraulic tank 20, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Details Of Reciprocating Pumps (AREA)

Claims (10)

  1. Ensemble hydraulique comprenant
    - une pompe de travail (12) destinée à délivrer un milieu hydraulique en direction d'une charge de travail hydraulique (14), et
    - un réservoir hydraulique (20) qui comporte une sortie de réservoir (18) destinée à être raccordée hydrauliquement au côté entrée de la pompe de travail (12), caractérisé par une pompe auxiliaire à entraînement électrique (22) qui est montée dans le réservoir hydraulique (20) et qui génère, en fonction d'une commande (28) d'un entraînement électrique associé (EM), un débit hydraulique (26) en direction de la sortie de réservoir (18).
  2. Ensemble selon la revendication 1, caractérisé en ce que le fonctionnement de la pompe auxiliaire (22) peut être commandé en fonction d'une détection d'au moins une grandeur physique (p_s, T_h, X_h, I_p, T_k, T_u) de la pompe de travail (12) et/ou du milieu hydraulique (26) et/ou de la pompe auxiliaire (22) et/ou d'un système de véhicule et/ou de l'environnement.
  3. Ensemble selon la revendication 2, caractérisé en ce que le fonctionnement de la pompe auxiliaire (22) est effectué au moyen d'un moteur électrique commandable (EM).
  4. Ensemble selon l'une des revendications précédentes, caractérisé en ce qu'un conduit d'acheminement (38), à travers lequel circule le milieu hydraulique (26), est interposé hydrauliquement entre la sortie de réservoir (18) et une sortie de pompe (36) de la pompe auxiliaire (22).
  5. Ensemble selon la revendication 4, caractérisé en ce que le conduit d'acheminement (38) est disposé au moins partiellement à l'intérieur du réservoir hydraulique (20).
  6. Ensemble selon la revendication 4 ou 5, caractérisé en ce que le conduit d'acheminement (38) comporte un échangeur de chaleur (40) à travers lequel un milieu hydraulique (26) circule du côté secondaire.
  7. Ensemble selon l'une des revendications 4 à 6, caractérisé en ce que le conduit d'acheminement (38) comporte une unité de filtration (42) à travers laquelle peut circuler le milieu hydraulique (26).
  8. Ensemble selon l'une des revendications 4 à 7, caractérisé en ce que le conduit d'acheminement (38) comporte un tamis d'aspiration (44).
  9. Ensemble selon la revendication 8, caractérisé en ce que le tamis d'aspiration (44) est raccordé hydrauliquement à la sortie de réservoir (18) en étant disposé immédiatement devant la sortie de réservoir (18) .
  10. Ensemble selon l'une des revendications précédentes, caractérisé en ce qu'il est utilisé dans un véhicule utilitaire agricole.
EP20197627.1A 2019-10-17 2020-09-23 Système hydraulique Active EP3808977B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019215975.3A DE102019215975A1 (de) 2019-10-17 2019-10-17 Hydraulische Anordnung

Publications (3)

Publication Number Publication Date
EP3808977A2 EP3808977A2 (fr) 2021-04-21
EP3808977A3 EP3808977A3 (fr) 2021-05-05
EP3808977B1 true EP3808977B1 (fr) 2023-08-30

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EP20197627.1A Active EP3808977B1 (fr) 2019-10-17 2020-09-23 Système hydraulique

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US (1) US11105324B2 (fr)
EP (1) EP3808977B1 (fr)
DE (1) DE102019215975A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4239195A1 (fr) * 2022-03-01 2023-09-06 Mathieu Centrale hydraulique

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3839689C2 (de) * 1988-11-24 1998-03-19 Rudolf Pickel Baukastenartig aufbaubares, elektromotorisch angetriebenes hydraulisches Pumpenaggregat
DE3931699A1 (de) * 1989-07-27 1991-02-07 Liebherr Werk Bischofshofen Verfahren und vorrichtung zum kaltstarten von mobilen arbeitsmaschinen, vorzugsweise baumaschinen
DE10215068B4 (de) * 2002-04-05 2009-01-15 Zf Lenksysteme Gmbh Ölbehälter
JP2004263806A (ja) * 2003-03-03 2004-09-24 Opton Co Ltd 液圧装置
US7444809B2 (en) * 2006-01-30 2008-11-04 Caterpillar Inc. Hydraulic regeneration system
US7845914B2 (en) 2007-02-15 2010-12-07 Deere & Company Self-priming fast fill sprayer pump system
US9982669B2 (en) * 2014-11-06 2018-05-29 Caterpillar Inc. Variable retraction rate pump and method for operating same
US10631531B2 (en) 2015-07-06 2020-04-28 Deere & Company Sprayer fluid operation system
ITUB20153995A1 (it) * 2015-09-29 2017-03-29 Cnh Ind Italia Spa Circuito idraulico per uso su un veicolo CVT.
DE102017203980A1 (de) * 2017-03-10 2018-09-13 Robert Bosch Gmbh Kraftstoffzuführeinrichtung, insbesondere für ein Kraftfahrzeug, mit mindestens einem Kraftstofftank
DE102017219224A1 (de) * 2017-10-26 2019-05-02 Robert Bosch Gmbh Kraftstofffördereinrichtung für kryogene Kraftstoffe, Verfahren zum Betreiben einer Kraftstofffördereinrichtung für kryogene Kraftstoffe

Also Published As

Publication number Publication date
EP3808977A2 (fr) 2021-04-21
EP3808977A3 (fr) 2021-05-05
US11105324B2 (en) 2021-08-31
DE102019215975A1 (de) 2021-04-22
US20210115649A1 (en) 2021-04-22

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