EP2406502A1 - Agencement d'alimentation d'un système hydraulique en liquide hydraulique - Google Patents

Agencement d'alimentation d'un système hydraulique en liquide hydraulique

Info

Publication number
EP2406502A1
EP2406502A1 EP10707035A EP10707035A EP2406502A1 EP 2406502 A1 EP2406502 A1 EP 2406502A1 EP 10707035 A EP10707035 A EP 10707035A EP 10707035 A EP10707035 A EP 10707035A EP 2406502 A1 EP2406502 A1 EP 2406502A1
Authority
EP
European Patent Office
Prior art keywords
reservoir
hydraulic fluid
arrangement according
control
working
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
EP10707035A
Other languages
German (de)
English (en)
Other versions
EP2406502B1 (fr
Inventor
Christian BRÜSER
Marcus Bitter
Scott R. Wiens
Helmut Schäfer
Harm-Hendrik Lange
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
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
Priority claimed from DE200910001448 external-priority patent/DE102009001448A1/de
Application filed by Deere and Co filed Critical Deere and Co
Publication of EP2406502A1 publication Critical patent/EP2406502A1/fr
Application granted granted Critical
Publication of EP2406502B1 publication Critical patent/EP2406502B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F15B1/265—Supply reservoir or sump assemblies with pressurised main reservoir
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F15B2211/20592—Combinations of pumps for supplying high and low pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means

Definitions

  • the invention relates to an arrangement for supplying a hydraulic system with hydraulic fluid.
  • the arrangement comprises a working reservoir for receiving the hydraulic fluid intended for operation of the hydraulic system.
  • the working reservoir is designed, for example, as a differential housing of a differential gear of an agricultural utility vehicle.
  • the arrangement comprises an auxiliary reservoir communicating with the working reservoir via a hydraulic line for temporary storage of hydraulic fluid removed from the working reservoir.
  • a charging oil pump continuously promotes hydraulic fluid from a formed by a differential housing working reservoir against gravity in a higher-lying auxiliary reservoir for temporary storage, the hydraulic fluid starting from the auxiliary reservoir is fed via a controllable high pressure pump in a hydraulic system for the operation of hydraulic vehicle units. Hydraulic fluid that is no longer required by the vehicle units is returned to the working reservoir.
  • the hydraulically operated vehicle units are, in particular, a steering and braking system and optionally attachable to the tractor agricultural implements, the hydraulic actuating cylinder or the like. Depending on the hydraulic fluid consumption of the vehicle units, there may be more or less pronounced fluctuations in the fluid level in the working reservoir.
  • the arrangement according to the invention for supplying a hydraulic system with hydraulic fluid comprises a working reservoir for receiving the hydraulic fluid intended for operation of the hydraulic system and an auxiliary reservoir communicating with the working reservoir via a hydraulic line for temporary storage of hydraulic fluid removed from the working reservoir.
  • an air conveying device is provided, the low-pressure side on the one hand with an opening into a liquid-free region of the auxiliary reservoir intake pipe is connected so that relative to the atmospheric pressure a negative pressure in the intake and thus in the associated auxiliary reservoir can be built, and on the other hand connected to a control line having a control port, at least before the start of the air conveyor of the hydraulic fluid in the working reservoir is covered.
  • the air conveying device If the air conveying device is put into operation, hydraulic fluid flows from the working reservoir via the hydraulic connection into the auxiliary reservoir due to the negative pressure built up in the auxiliary reservoir via the suction line.
  • the liquid level drops in the working reservoir, wherein below a certain liquid level, the control opening is at least partially exposed in the control line, so that the negative pressure built up in the auxiliary reservoir as a result of the intake via the control line from the surrounding air drops to a dependent on the flow resistance of the control port value. Due to the pressure drop, the liquid level swings back in the direction of the control opening, so that it is again covered by hydraulic fluid. This process is repeated with decreasing intensity until a corresponding equilibrium position of the liquid level in the working reservoir has been established.
  • the liquid columns communicating in the two reservoirs via the hydraulic line are excited to a damped oscillation, whereby, after the oscillation has subsided, an equilibrium position of the liquid level in the working reservoir which depends on the position or installation height and / or the flow resistance of the control opening is established . regulates.
  • the air conveying device is preferably designed as an electrically driven vacuum pump.
  • the air conveyor can be connected via a belt with the engine.
  • Such a vacuum pump is already present in John Deere 6030 and 7030 series tractors as part of a hydraulic supply of a vehicle transmission cooperating with the internal combustion engine, so that the arrangement according to the invention can be realized with comparatively little additional effort. Since only a slight underpressure of the order of at most a few tenths of a bar is built up in the auxiliary reservoir, no special demands are placed on its pressure capacity.
  • the suction line can either open directly into the control line or indirectly communicate with it.
  • the control line can also open into the liquid-free region of the auxiliary reservoir, so that the intake and the control line communicate only indirectly with each other and undesired penetration of hydraulic fluid drawn in via the control line from the working reservoir into the air conveying device connected to the suction line is prevented.
  • the control opening is formed in the control line as a circular or slot-shaped inlet, the latter can be oriented in the longitudinal direction of the control line.
  • the control opening may be formed in an end region projecting into the working reservoir, for example through an open end of the control line.
  • control openings In the case of a plurality of control openings, these are preferably arranged one above the other in the end region of the control line such that they are successively exposed when the negative pressure builds up due to the liquid level falling in the working reservoir.
  • the pressure drop in the control line is slowed down in this case, so that the excitation of a damped oscillation of the liquid columns located in the reservoirs and communicating via the hydraulic line is largely suppressed. This favors a faster adjustment or regulation of a stable equilibrium position of the liquid level in the working reservoir.
  • the control line is surrounded by a shielding element in the region of the control opening.
  • the shielding element is designed or arranged such that an occurrence of turbulence in the region of the control opening is largely suppressed.
  • the shielding element may in particular be a cylindrical shielding tube, which is closed at its lower end by means of a liquid-permeable grid.
  • the cylindrical shielding tube is dimensioned such that it forms, together with the control line, an annular gap open at the top, via which the control opening can communicate with the hydraulic fluid in the working reservoir. This can fall in the working reservoir Liquid levels drain the hydraulic fluid through the liquid-permeable mesh.
  • a return valve or a float valve instead of a throttle valve, which is blocked in the case of penetrating hydraulic fluid.
  • the non-return valve or float valve has, in particular, a floating ball ball or a float, which is pressed against a valve seat when hydraulic fluid enters such that an undesired flow of hydraulic fluid is prevented.
  • a ball valve for producing a pressure equalization connection between the low-pressure side of the air conveying device and the working reservoir can be actuated by means of the float included by the float valve at the same time.
  • a pressure relief valve may be arranged such that this is permeable when a predetermined negative pressure is exceeded and establishes a pressure equalization connection between the low pressure side of the air conveyor and the working reservoir.
  • the pressure-limiting valve is either arranged directly in a liquid-free region of the working reservoir or connected thereto via a pressure compensation line. In the latter case, the pressure limiting valve is preferably arranged outside the working reservoir.
  • the pressure relief valve is in particular a conventional spring-loaded one-way valve.
  • 1 shows a first embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid
  • 2 shows a second embodiment of the arrangement according to the invention for supplying a hydraulic system with hydraulic fluid
  • Fig. 3 shows a third embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid
  • Fig. 4 shows a third embodiment of the arrangement according to the invention for supplying a hydraulic system with hydraulic fluid.
  • Fig. 1 shows a first embodiment of the inventive arrangement for supplying a hydraulic system in an agricultural utility vehicle, not shown, with hydraulic fluid.
  • the agricultural utility vehicle is, for example, a tractor, a harvesting machine, a forage harvester or a spraying machine.
  • the arrangement 10 accommodated in an engine compartment or in the region of a transmission assembly of the agricultural utility vehicle comprises a working reservoir 12 for receiving the hydraulic fluid intended for operation of the hydraulic system and an auxiliary reservoir 16 for temporary storage or buffering connected to the working reservoir 12 via a hydraulic line 14 from the working reservoir 12 removed hydraulic fluid.
  • the working reservoir 12 is designed, for example, as a differential housing of a differential gear unit encompassed by the agricultural utility vehicle.
  • the hydraulic fluid in the differential housing also forms a sump for lubricating the differential gear.
  • the hydraulic fluid is conventional hydraulic or gear oil.
  • the hydraulic line 14 extends between a lower portion of the working reservoir 12 and a lower portion of the auxiliary reservoir 16.
  • the auxiliary reservoir 16 is arranged elevated relative to the working reservoir 12 wherein the hydraulic line 14 is connected to a lower side of the auxiliary reservoir 16 so that the auxiliary reservoir 16 can be completely emptied in the direction of the working reservoir 12.
  • the hydraulic fluid is supplied by means of a charging oil pump 18 via an intermediate oil filter 20 to an existing in the agricultural vehicle engine 22 and other power transmitting components for the purpose of lubrication.
  • a controllable high-pressure pump 24 connected downstream of the oil filter 20 serves to supply hydraulically operated vehicle units 26, for example a steering and braking system or an attachment attachable to the agricultural utility vehicle, which has hydraulic adjusting cylinders or the like. Not (more) required or excess hydraulic fluid is returned to the working reservoir 12 via lines not shown.
  • an air delivery device 28 which is connected on the low-pressure side to a suction line 32 opening into a liquid-free region 30 of the auxiliary reservoir 16, so that a negative pressure can be built up in the auxiliary reservoir 16 relative to the atmospheric ambient pressure, and the other side is connected to a control line 34 is, which has a plurality of similar, designed as throttle valves control openings 36a and 34b formed by a downwardly open end of the control line control opening 36b, wherein the control openings 36a and 36b at least before commissioning of the air conveyor 28, so before building the negative pressure in the auxiliary reservoir 16 of who is working reservoir 12 are completely covered hydraulic fluid.
  • control openings 36a and 36b are arranged one above the other in an end region 38 of the control line 34 projecting into the working reservoir 12.
  • the control openings 36a are formed in the control line 34 as a circular or slot-shaped inlets, the latter being oriented in the longitudinal direction of the control line 34.
  • the control opening 36b formed by the open end of the control line 34 typically has a diameter of the order of 25 millimeters.
  • control openings 36a and 36b are merely an example Has .
  • the air conveying device 28 is a vacuum pump of conventional design driven electrically or by means of the internal combustion engine 22 of the agricultural utility vehicle. This generates in the auxiliary reservoir 16, a negative pressure in the order of typically 50 mbar.
  • the control line 34 is surrounded by a shielding element 40 in the region of the control openings 36a and 36b.
  • the shielding element 40 is a cylindrical shielding tube 42, which is closed at its lower end by means of a liquid-permeable grid 44.
  • the cylindrical shielding tube 42 is dimensioned such that it forms, together with the control line 34, an upwardly open annular gap 46, via which the control openings 36a and 36b can communicate with the hydraulic fluid in the working reservoir 12.
  • a respective throttle valve 48 or 50 is arranged in the intake line 32 or control line 34, which controls the negative pressure built up by means of the air delivery device 28 increased upon entry of hydraulic fluid such that a zwi rule the throttle valve 48 and 50 and the air conveyor 28 arranged pressure relief valve 52 is permeable when a predetermined negative pressure is exceeded and thereby produces a pressure equalization connection between the low pressure side of the air conveyor 28 and the working reservoir 12.
  • the pressure limiting valve 52 is arranged for this purpose directly in a liquid-free region of the working reservoir 12.
  • the pressure relief valve 52 is a conventional spring loaded one way valve.
  • Fig. 2 shows a second embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid. This differs from the first embodiment shown in FIG. 1 in that, instead of the two throttle valves 48 and 50, only a single throttle valve 54 is provided. Furthermore, the pressure limiting valve 52 is arranged in the present case outside the working reservoir 12 and connected thereto via a pressure equalization line 56.
  • a throttle valve 60 opening into a liquid-free region of the working reservoir 12 is provided in the control line 34, which at low operating temperatures and the resulting increased viscosity of the hydraulic fluid in the process.
  • Bonding with the pressure relief valve 52 prevents that when starting the air conveyor 28, an excessive negative pressure in the intake manifold 32 is constructed.
  • the flow resistance of the throttle valve 60 is dimensioned such that at normal operating temperatures, a sufficient negative pressure in the suction line 32 connected to the control line 34 and thus in the auxiliary reservoir 16 can be established.
  • Fig. 3 shows a third embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid. This differs from the second embodiment shown in Fig. 2 in that instead of the throttle valve 54, a return valve 58 is provided, which is arranged such that it is blocked in case of penetrating hydraulic fluid.
  • the recoil valve 58 has a floating ball valve which is pressed upon penetration of hydraulic fluid against a valve seat such that an undesirable flow of hydraulic fluid is prevented.
  • the intake manifold 32 does not open directly into the control line 34. Rather, there is only an indirect connection between the intake manifold 32 and the control line 34.
  • the control line 32 also opens into the liquid-free region 30 of the auxiliary reservoir 16. Since the Both lines 32 and 34 communicate only indirectly with each other in this case, an additional protection against undesired penetration of hydraulic fluid sucked in via the control line 34 from the working reservoir 12 into the air conveying device 28 connected to the suction line 32.
  • the intake line 32 and the control line 34 are connected to an upper side of the auxiliary reservoir 16. 4 shows a fourth exemplary embodiment of the arrangement according to the invention for supplying a hydraulic system with hydraulic fluid. This differs from the third embodiment shown in FIG.
  • a float valve 62 is provided, the float of which is pressed against a valve seat in such a way that the connection via the suction line 32 to the auxiliary reservoir 16 is pressed against a valve seat interrupted and at the same time by actuation of a ball valve connected to the float 64 bridging the pressure relief valve 52, a pressure equalization connection between the low pressure side of the air conveyor 28 and the working reservoir 12 is made.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

L'invention concerne un agencement (10) d'alimentation d'un système hydraulique en liquide hydraulique, avec un réservoir de travail (12) destiné à recevoir le liquide hydraulique prévu pour le fonctionnement du système hydraulique et avec un réservoir auxiliaire (16) qui est relié au réservoir de travail (12) par une conduite hydraulique (14), destiné au stockage intermédiaire de liquide hydraulique prélevé dans le réservoir de travail (12). Selon l'invention, il est prévu un dispositif pneumatique de transport (28) qui est relié d'une part, côté basse pression, avec une conduite d'aspiration (32) débouchant dans une partie exempte de liquide (30) du réservoir auxiliaire (16), si bien qu'il peut s'établir dans le réservoir auxiliaire (16) une dépression par rapport à la pression atmosphérique ambiante, et qui est relié d'autre part à une conduite de commande (34) qui possède une ouverture de commande (36a, 36b) laquelle, au moins avant la mise en service du dispositif pneumatique de transport (28), est recouverte par le liquide hydraulique se trouvant dans le réservoir de travail (12).
EP10707035A 2009-03-10 2010-03-05 Agencement d'alimentation d'un système hydraulique en liquide hydraulique Active EP2406502B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910001448 DE102009001448A1 (de) 2008-09-03 2009-03-10 Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit
PCT/EP2010/052833 WO2010102957A1 (fr) 2009-03-10 2010-03-05 Agencement d'alimentation d'un système hydraulique en liquide hydraulique

Publications (2)

Publication Number Publication Date
EP2406502A1 true EP2406502A1 (fr) 2012-01-18
EP2406502B1 EP2406502B1 (fr) 2013-02-27

Family

ID=42199385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10707035A Active EP2406502B1 (fr) 2009-03-10 2010-03-05 Agencement d'alimentation d'un système hydraulique en liquide hydraulique

Country Status (2)

Country Link
EP (1) EP2406502B1 (fr)
WO (1) WO2010102957A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9599127B2 (en) * 2009-03-10 2017-03-21 Deere & Company Hydraulic circuit supply system
CN104047928B (zh) * 2014-02-13 2016-06-01 中国北方车辆研究所 一种多功能压力油箱调节装置
FR3030650B1 (fr) * 2014-12-17 2017-01-13 Technoboost Circuit hydraulique comprenant un reservoir tres basse pression mis en depression

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2822209A1 (de) 1978-05-22 1979-11-29 Barmag Barmer Maschf Verbrennungskraftmaschine mit einer oelpumpe zur herstellung von schmieroelstroemen
SE9303680L (sv) * 1993-05-25 1994-11-26 Haakan Ingvast Produktutveckli Vätskeburet system med anordning för avgasning av vätskan
DE102007033419B4 (de) * 2007-07-18 2016-03-24 Audi Ag Trockensumpfschmiervorrichtung für eine Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010102957A1 *

Also Published As

Publication number Publication date
WO2010102957A1 (fr) 2010-09-16
EP2406502B1 (fr) 2013-02-27

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