EP2161458B1 - Assembly for supplying a hydraulic system with hydraulic fluid - Google Patents
Assembly for supplying a hydraulic system with hydraulic fluid Download PDFInfo
- Publication number
- EP2161458B1 EP2161458B1 EP20090168925 EP09168925A EP2161458B1 EP 2161458 B1 EP2161458 B1 EP 2161458B1 EP 20090168925 EP20090168925 EP 20090168925 EP 09168925 A EP09168925 A EP 09168925A EP 2161458 B1 EP2161458 B1 EP 2161458B1
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- EP
- European Patent Office
- Prior art keywords
- reservoir
- arrangement according
- line
- control
- hydraulic
- 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.)
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- 239000012530 fluid Substances 0.000 title abstract description 65
- 239000007788 liquid Substances 0.000 claims description 24
- 238000012432 intermediate storage Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 8
- 230000035515 penetration Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000004459 forage Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000012208 gear oil Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003936 working memory Effects 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2931—Diverse fluid containing pressure systems
- Y10T137/3109—Liquid filling by evacuating container
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
- Y10T137/86035—Combined with fluid receiver
- Y10T137/86043—Reserve or surge receiver
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86187—Plural tanks or compartments connected for serial flow
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86348—Tank with internally extending flow guide, pipe or conduit
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 present, which is connected on the low-pressure side to a suction line opening into a liquid-free region of the auxiliary reservoir so that a negative pressure can be built up in the intake line and thus in the associated auxiliary reservoir relative to the atmospheric ambient pressure, and with a control line connected, the one Has control opening, which is covered at least before starting up the air conveyor of the located in the working reservoir hydraulic fluid.
- 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. Alternatively, it is conceivable to drive them by means of an internal combustion engine arranged in the agricultural vehicle. For this purpose, the air conveyor can be connected via a belt with the engine.
- control openings in particular designed as throttle valves, are provided in the control line. These are preferably arranged 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 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.
- 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.
- control opening may be formed in an end region projecting into the working reservoir, for example through an open end of the control line. 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.
- 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 orifice communicate with the hydraulic fluid in the working reservoir can. In this case, when the liquid level falls in the working reservoir, the hydraulic fluid can flow away through the liquid-permeable grid.
- the recoil valve has, in particular, a floating ball valve which, when hydraulic fluid penetrates, is pressed against a valve seat in such a way that an undesirable flow of hydraulic fluid is prevented.
- hydraulic fluid does not drain in the direction of the working reservoir and the liquid level in the working reservoir in the sequence can not assume a stable equilibrium position. This can ultimately lead to overfilling of the auxiliary reservoir and thus to an ingress of hydraulic fluid via the intake into the associated air conveyor. It is therefore advantageous in the control line in a liquid-free area Provide the working reservoir opening throttle valve, which reduces the built-up by means of the air conveyor in the suction negative pressure to non-critical values.
- a pressure relief valve may be arranged such that this is permeable when a predetermined negative pressure is exceeded and produces 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 limiting valve is in particular a conventional one-way valve.
- 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 communicating with the working reservoir 12 via a hydraulic line 14 for temporary storage or buffering the working reservoir 12 removed hydraulic fluid.
- the working reservoir 12 is designed, for example, as a differential housing of a differential gear 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 , where the Hydraulic line 14 is connected to a bottom of the auxiliary reservoir 16, so that the auxiliary reservoir 16 can be completely empty in the direction of the working memory 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 actuating cylinders or the like. Not (more) required or excess hydraulic fluid is returned here via lines not shown in the working reservoir 12.
- 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 the hydraulic fluid located in the working reservoir 12 are completely covered.
- 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 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 has merely exemplary character.
- the air conveying device 28 is a conventional vacuum pump driven electrically or by means of the internal combustion engine 22 of the agricultural utility vehicle Design type. 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 throttle valve 48 or 50 is respectively arranged in the intake line 32 and control line 34, which controls the negative pressure built up by means of the air delivery device 28 increases upon entry of hydraulic fluid such that a arranged between the throttle valve 48 and 50 and the air conveyor 28 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 relief valve 52 is for this purpose directly in a liquid-free region of the working reservoir 12 arranged.
- the pressure relief valve 52 is a conventional 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 one in Fig. 1 illustrated first embodiment 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.
- Fig. 3 shows a third embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid. This differs from the one in Fig. 2 illustrated second embodiment that instead of the throttle valve 54, a return valve 58 is provided which is arranged such that it is blocked in the 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. For this purpose, the control line 32 also opens into the liquid-free region 30 of the auxiliary reservoir 16.
- 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.
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- 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)
- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Die Erfindung betrifft eine Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit. Die Anordnung umfasst ein Arbeitsreservoir zur Aufnahme der zum Betrieb des Hydrauliksystems vorgesehenen Hydraulikflüssigkeit. Das Arbeitsreservoir ist beispielsweise als Differentialgehäuse eines Differentialgetriebes eines landwirtschaftlichen Nutzfahrzeugs ausgebildet. Des Weiteren umfasst die Anordnung ein mit dem Arbeitsreservoir über eine Hydraulikleitung in Verbindung stehendes Hilfsreservoir zur Zwischenspeicherung von aus dem Arbeitsreservoir entnommener Hydraulikflüssigkeit.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. Furthermore, 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.
In diesem Zusammenhang ist bei John Deere Traktoren der Serien 6030 und 7030 eine gattungsgemäße Anordnung bekannt, bei der eine Ladeölpumpe kontinuierlich Hydraulikflüssigkeit aus einem durch ein Differentialgehäuse gebildetes Arbeitsreservoir entgegen der Schwerkraft in ein höher gelegenes Hilfsreservoir zur Zwischenspeicherung fördert, wobei die Hydraulikflüssigkeit ausgehend von dem Hilfsreservoir über eine regelbare Hochdruckpumpe in ein Hydrauliksystem zum Betrieb hydraulischer Fahrzeugaggregate eingespeist wird. Von den Fahrzeugaggregaten nicht mehr benötigte Hydraulikflüssigkeit wird in das Arbeitsreservoir zurückgeführt. Bei den hydraulisch betriebenen Fahrzeugaggregaten handelt es sich insbesondere um eine Lenk- und Bremsanlage sowie gegebenenfalls um an dem Traktor anbringbare landwirtschaftliche Anbaugeräte, die hydraulische Stellzylinder oder dergleichen aufweisen. Je nach Hydraulikflüssigkeitsverbrauch der Fahrzeugaggregate kann es dabei zu mehr oder weniger ausgeprägten Schwankungen des Flüssigkeitspegels im Arbeitsreservoir kommen.In this context, in John Deere tractor series 6030 and 7030 a generic arrangement is known in which 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.
Da an der Ladeölpumpe beim Fördern der Hydraulikflüssigkeit ausgangsseitig ein Druck in der Größenordnung von einigen bar anliegt, ergeben sich zudem erhöhte Anforderungen an die Druckbelastbarkeit des Hilfsreservoirs. Diese führen aufgrund des damit verbundenen konstruktiven Mehraufwands zu entsprechenden Zusatzkosten. Tritt eine erhöhte Entnahme von Hydraulikflüssigkeit beim Betrieb der Fahrzeugaggregate auf, so besteht zudem die Möglichkeit, dass das Arbeitsreservoir aufgrund des kontinuierlichen Betriebs der Ladeölpumpe vollständig in Richtung des Hilfsreservoirs entleert wird, mithin also die Ladeölpumpe "trocken" bzw. ungeschmiert weiterläuft. Letzteres kann sich nicht nur nachteilig auf die Lebensdauer der Ladeölpumpe auswirken, sondern führt zudem zur Unterbrechung der Schmierung des in dem Differentialgehäuse befindlichen Differentialgetriebes. Ein weiteres Beispel ist in Dokument
Es ist daher Aufgabe der Erfindung, eine gleichbleibende Versorgung des Hydrauliksystems mit Hydraulikflüssigkeit zu ermöglichen.It is therefore an object of the invention to enable a constant supply of the hydraulic system with hydraulic fluid.
Diese Aufgabe wird durch eine Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit gemäß den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved by an arrangement for supplying a hydraulic system with hydraulic fluid according to the features of patent claim 1.
Die erfindungsgemäße Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit umfasst ein Arbeitsreservoir zur Aufnahme der zum Betrieb des Hydrauliksystems vorgesehenen Hydraulikflüssigkeit sowie ein mit dem Arbeitsreservoir über eine Hydraulikleitung in Verbindung stehendes Hilfsreservoir zur Zwischenspeicherung von aus dem Arbeitsreservoir entnommener Hydraulikflüssigkeit.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.
Des Weiteren ist eine Luftfördereinrichtung vorhanden, die niederdruckseitig einerseits mit einer in einen flüssigkeitsfreien Bereich des Hilfsreservoirs mündenden Ansaugleitung verbunden ist, sodass sich gegenüber dem atmosphärischen Umgebungsdruck ein Unterdruck in der Ansaugleitung und damit in dem damit verbundenen Hilfsreservoir aufbauen lässt, und die andererseits mit einer Steuerleitung verbunden ist, die eine Steueröffnung aufweist, die zumindest vor Inbetriebnahme der Luftfördereinrichtung von der im Arbeitsreservoir befindlichen Hydraulikflüssigkeit bedeckt ist.Furthermore, an air conveying device is present, which is connected on the low-pressure side to a suction line opening into a liquid-free region of the auxiliary reservoir so that a negative pressure can be built up in the intake line and thus in the associated auxiliary reservoir relative to the atmospheric ambient pressure, and with a control line connected, the one Has control opening, which is covered at least before starting up the air conveyor of the located in the working reservoir hydraulic fluid.
Wird die Luftfördereinrichtung in Betrieb genommen, so fließt aufgrund des im Hilfsreservoir über die Ansaugleitung aufgebauten Unterdrucks Hydraulikflüssigkeit vom Arbeitsreservoir über die Hydraulikverbindung in das Hilfsreservoir. Dabei fällt der Flüssigkeitspegel im Arbeitsreservoir, wobei unterhalb eines bestimmten Flüssigkeitspegels die Steueröffnung in der Steuerleitung zumindest partiell freigelegt wird, sodass der im Hilfsreservoir aufgebaute Unterdruck infolge der über die Steuerleitung aus der Umgebung angesaugten Luft auf einen vom Strömungswiderstand der Steueröffnung abhängigen Wert abfällt. Aufgrund des Druckabfalls kommt es zu einem Zurückschwingen des Flüssigkeitspegels in Richtung der Steueröffnung, sodass diese erneut von Hydraulikflüssigkeit bedeckt wird. Dieser Vorgang wiederholt sich mit abklingender Intensität solange, bis sich eine entsprechende Gleichgewichtslage des Flüssigkeitspegels im Arbeitsreservoir eingestellt hat. Mit anderen Worten werden die in den beiden Reservoiren über die Hydraulikleitung in Verbindung stehenden Flüssigkeitssäulen zu einer gedämpften Schwingung angeregt, wobei sich nach Abklingen der Schwingung eine von der Position bzw. Einbauhöhe und/oder dem Strömungswiderstand der Steueröffnung abhängige Gleichgewichtslage des Flüssigkeitspegels im Arbeitsreservoir einstellt bzw. einregelt.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. In this case, 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. In other words, 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.
Die Luftfördereinrichtung ist vorzugsweise als elektrisch angetriebene Vakuumpumpe ausgebildet. Alternativ ist es denkbar, diese mittels eines in dem landwirtschaftlichen Nutzfahrzeug angeordneten Verbrennungsmotors anzutreiben. Hierzu kann die Luftfördereinrichtung über einen Keilriemen mit dem Verbrennungsmotor in Verbindung stehen.The air conveying device is preferably designed as an electrically driven vacuum pump. Alternatively, it is conceivable to drive them by means of an internal combustion engine arranged in the agricultural vehicle. For this purpose, the air conveyor can be connected via a belt with the engine.
Eine derartige Vakuumpumpe ist bei John Deere Traktoren der Serien 6030 und 7030 als Bestandteil einer Hydraulikversorgung eines mit dem Verbrennungsmotor zusammenwirkenden Fahrzeuggetriebes bereits vorhanden, sodass sich die erfindungsgemäße Anordnung mit vergleichsweise geringem Zusatzaufwand verwirklichen lässt. Da lediglich ein geringfügiger Unterdruck in der Größenordnung von allenfalls einigen Zehntel bar im Hilfsreservoir aufgebaut wird, werden zudem keine besonderen Anforderungen an dessen Druckbelastbarkeit gestellt.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 negative pressure in the order of at most a few tenths bar in the auxiliary reservoir is built, also no special requirements are placed on the pressure capacity.
Vorteilhafte Ausführungen der erfindungsgemäßen Anordnung gehen aus den Unteransprüchen hervor.Advantageous embodiments of the arrangement according to the invention will become apparent from the dependent claims.
Um eine Nachregelung des Flüssigkeitspegels im Arbeitsreservoir sowohl im Falle einer Zuführung von Hydraulikflüssigkeit als auch bei deren Entnahme zu ermöglichen, ist es von Vorteil, wenn sich die Hydraulikleitung zwischen einem unteren Bereich des Arbeitsreservoirs und einem unteren Bereich des Hilfsreservoirs erstreckt, sodass die Hydraulikflüssigkeit zwischen den beiden Reservoiren frei hin- und herströmen kann.In order to enable a readjustment of the liquid level in the working reservoir, both in the case of supply of hydraulic fluid as well as their removal, it is advantageous if the hydraulic line between a lower portion of the working reservoir and a lower portion of the auxiliary reservoir extends, so that the hydraulic fluid between the Both reservoirs can flow freely back and forth.
Des Weiteren besteht die Möglichkeit, dass in der Steuerleitung mehrere, insbesondere als Drosselventile ausgebildete Steueröffnungen vorgesehen sind. Diese sind vorzugsweise derart angeordnet, dass diese bei Aufbau des Unterdrucks aufgrund des im Arbeitsreservoir fallenden Flüssigkeitspegels sukzessive freigelegt werden. Der Druckabfall in der Steuerleitung erfolgt in diesem Fall verlangsamt, sodass die Anregung einer gedämpften Schwingung der in den Reservoiren befindlichen und über die Hydraulikleitung in Verbindung stehenden Flüssigkeitssäulen weitgehend unterdrückt wird. Dies begünstigt eine raschere Einstellung bzw. Einregelung einer stabilen Gleichgewichtslage des Flüssigkeitspegels im Arbeitsreservoir.Furthermore, there is the possibility that a plurality of control openings, in particular designed as throttle valves, are provided in the control line. These are preferably arranged 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.
Die Ansaugleitung kann entweder unmittelbar in die Steuerleitung münden oder aber mittelbar mit dieser in Verbindung stehen. In letzterem Fall kann die Steuerleitung ebenfalls in den flüssigkeitsfreien Bereich des Hilfsreservoirs münden, sodass die Ansaugleitung und die Steuerleitung lediglich indirekt miteinander kommunizieren und ein unerwünschtes Eindringen von über die Steuerleitung aus dem Arbeitsreservoir angesaugter Hydraulikflüssigkeit in die mit der Ansaugleitung verbundene Luftfördereinrichtung verhindert wird.The suction line can either open directly into the control line or indirectly communicate with it. In the latter case, 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.
Vorzugsweise ist die Steueröffnung in der Steuerleitung als kreis- oder schlitzförmiger Einlass ausgebildet, wobei letzterer in Längsrichtung der Steuerleitung orientiert sein kann. Insbesondere kann die Steueröffnung in einem in das Arbeitsreservoir hineinragenden Endbereich, beispielsweise durch ein offenes Ende der Steuerleitung gebildet sein. Im Falle mehrerer Steueröffnungen sind diese bevorzugt im Endbereich der Steuerleitung übereinander angeordnet.Preferably, 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. In particular, 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. 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.
Da beim Betrieb des Hydrauliksystems die Möglichkeit besteht, dass Turbulenzen in der Hydraulikflüssigkeit auftreten, die zu einem unerwünschten Eindringen von Luft in die Steuerleitung führen können, ist es von Vorteil, wenn die Steuerleitung im Bereich der Steueröffnung von einem Abschirmelement umgeben ist. Das Abschirmelement ist derart ausgebildet bzw. angeordnet, dass ein Auftreten von Turbulenzen im Bereich der Steueröffnung weitgehend unterdrückt wird.Since during operation of the hydraulic system there is the possibility that turbulences in the hydraulic fluid occur, which can lead to an undesired ingress of air into the control line, it is advantageous if 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.
Bei dem Abschirmelement kann es sich insbesondere um ein zylindrisches Abschirmrohr handeln, das an seinem unteren Ende mittels eines flüssigkeitsdurchlässigen Gitters verschlossen ist. Das zylindrische Abschirmrohr ist derart bemessen, dass dieses gemeinsam mit der Steuerleitung einen nach oben hin offenen Ringspalt ausbildet, über den die Steueröffnung mit der im Arbeitsreservoir befindlichen Hydraulikflüssigkeit kommunizieren kann. Hierbei kann bei im Arbeitsreservoir fallendem Flüssigkeitspegel die Hydraulikflüssigkeit durch das flüssigkeitsdurchlässige Gitter abfließen.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 orifice communicate with the hydraulic fluid in the working reservoir can. In this case, when the liquid level falls in the working reservoir, the hydraulic fluid can flow away through the liquid-permeable grid.
Im Falle einer übermäßigen Befüllung des Arbeitsreservoirs mit Hydraulikflüssigkeit besteht die Möglichkeit, dass der Flüssigkeitspegel im Arbeitsreservoir nach Inbetriebnahme der Luftfördereinrichtung aufgrund des begrenzten Fassungsvermögens des Hilfsreservoirs nicht ausreichend zu fallen vermag, um die Steueröffnung freizulegen. Um einem unerwünschten Eindringen von Hydraulikflüssigkeit über die Ansaugleitung bzw. die Steuerleitung in die Luftfördereinrichtung vorzubeugen, ist es von Vorteil, wenn in der Ansaugleitung und/oder der Steuerleitung ein Drosselventil angeordnet ist, das den mittels der Luftfördereinrichtung aufgebauten Unterdruck auf unkritische Werte reduziert.In the case of excessive filling of the working reservoir with hydraulic fluid, there is the possibility that the liquid level in the working reservoir after commissioning of the air conveyor due to the limited capacity of the auxiliary reservoir can not fall sufficiently to expose the control port. In order to prevent undesired penetration of hydraulic fluid via the suction line or the control line into the air conveying device, it is advantageous if a throttle valve is arranged in the suction line and / or the control line which reduces the negative pressure built up by means of the air conveying device to uncritical values.
Grundsätzlich ist es denkbar, anstelle eines Drosselventils ein Rückstoßventil vorzusehen, das im Falle eindringender Hydraulikflüssigkeit gesperrt wird. Das Rückstoßventil weist insbesondere eine schwimmend gelagerte Ventilkugel auf, die bei Eindringen von Hydraulikflüssigkeit derart gegen einen Ventilsitz gepresst wird, dass ein unerwünschter Durchfluss von Hydraulikflüssigkeit unterbunden wird.
Bei niedrigen Betriebstemperaturen und dadurch bedingter erhöhter Viskosität der Hydraulikflüssigkeit ist es möglich, dass nach Inbetriebnahme der Luftfördereinrichtung die in der Steuerleitung befindliche Hydraulikflüssigkeit nicht in Richtung des Arbeitsreservoirs abzufließen und der Flüssigkeitspegel im Arbeitsreservoir in der Folge keine stabile Gleichgewichtslage einzunehmen vermag. Dies kann letztlich zur Überfüllung des Hilfsreservoirs und damit zu einem Eindringen von Hydraulikflüssigkeit über die Ansaugleitung in die damit verbundene Luftfördereinrichtung führen. Es ist daher von Vorteil, in der Steuerleitung ein in einen flüssigkeitsfreien Bereich des Arbeitsreservoirs mündendes Drosselventil vorzusehen, das den mittels der Luftfördereinrichtung in der Ansaugleitung aufgebauten Unterdruck auf unkritische Werte reduziert.In principle, it is conceivable to provide a return valve instead of a throttle valve, which is blocked in the case of penetrating hydraulic fluid. The recoil valve has, in particular, a floating ball valve which, when hydraulic fluid penetrates, is pressed against a valve seat in such a way that an undesirable flow of hydraulic fluid is prevented.
At low operating temperatures and consequent increased viscosity of the hydraulic fluid, it is possible that after starting up the air conveyor located in the control line hydraulic fluid does not drain in the direction of the working reservoir and the liquid level in the working reservoir in the sequence can not assume a stable equilibrium position. This can ultimately lead to overfilling of the auxiliary reservoir and thus to an ingress of hydraulic fluid via the intake into the associated air conveyor. It is therefore advantageous in the control line in a liquid-free area Provide the working reservoir opening throttle valve, which reduces the built-up by means of the air conveyor in the suction negative pressure to non-critical values.
Zusätzlich kann zwischen dem Drosselventil und der Luftfördereinrichtung bzw. dem Rückstoßventil und der Luftfördereinrichtung ein Druckbegrenzungsventil derart angeordnet sein, dass dieses bei Überschreiten eines vorgegebenen Unterdrucks durchlässig wird und eine Druckausgleichsverbindung zwischen der Niederdruckseite der Luftfördereinrichtung und dem Arbeitsreservoir herstellt. Das Druckbegrenzungsventil ist zu diesem Zweck entweder unmittelbar in einem flüssigkeitsfreien Bereich des Arbeitsreservoirs angeordnet oder aber mit diesem über eine Druckausgleichsleitung verbunden. In letzterem Fall ist das Druckbegrenzungsventil vorzugsweise außerhalb des Arbeitsreservoirs angeordnet. Bei dem Druckbegrenzungsventil handelt es sich insbesondere um ein herkömmliches Einwegventil.In addition, between the throttle valve and the air conveyor or the recoil valve and the air conveyor a pressure relief valve may be arranged such that this is permeable when a predetermined negative pressure is exceeded and produces a pressure equalization connection between the low pressure side of the air conveyor and the working reservoir. For this purpose, 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 limiting valve is in particular a conventional one-way valve.
Die erfindungsgemäße Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit wird im Folgenden anhand der beigefügten Zeichnungen näher erläutert. Dabei sind hinsichtlich ihrer Funktion übereinstimmende bzw. vergleichbare Bauteile mit denselben Bezugszeichen gekennzeichnet. Es zeigen:
- Fig. 1
- ein erstes Ausführungsbeispiel der erfindungsgemäßen Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit,
- Fig. 2
- ein zweites Ausführungsbeispiel der erfindungsgemäßen Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit, und
- Fig. 3
- ein drittes Ausführungsbeispiel der erfindungsgemäßen Anordnung zur Versorgung eines Hydrauliksystems mit Hydraulikflüssigkeit.
- Fig. 1
- A first embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid,
- Fig. 2
- A second embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid, and
- Fig. 3
- A third embodiment of the inventive arrangement for supplying a hydraulic system with hydraulic fluid.
Die in einem Motorraum oder im Bereich einer Getriebebaugruppe des landwirtschaftlichen Nutzfahrzeugs untergebrachte Anordnung 10 umfasst ein Arbeitsreservoir 12 zur Aufnahme der zum Betrieb des Hydrauliksystems vorgesehenen Hydraulikflüssigkeit und ein mit dem Arbeitsreservoir 12 über eine Hydraulikleitung 14 in Verbindung stehendes Hilfsreservoir 16 zur Zwischenspeicherung bzw. Pufferung von aus dem Arbeitsreservoir 12 entnommener Hydraulikflüssigkeit.The
Das Arbeitsreservoir 12 ist beispielsweise als Differentialgehäuse eines von dem landwirtschaftlichen Nutzfahrzeug umfassten Differentialgetriebes ausgebildet. Die in dem Differentialgehäuse befindliche Hydraulikflüssigkeit bildet zugleich einen Sumpf zur Schmierung des Differentialgetriebes. Bei der Hydraulikflüssigkeit handelt es sich um herkömmliches Hydraulik- bzw. Getriebeöl.The working
Um ein freies Hin- und Herströmen der Hydraulikflüssigkeit zwischen den beiden Reservoiren 12 und 16 zu ermöglichen, erstreckt sich die Hydraulikleitung 14 zwischen einem unteren Bereich des Arbeitsreservoirs 12 und einem unteren Bereich des Hilfsreservoirs 16. Beispielsgemäß ist das Hilfsreservoir 16 gegenüber dem Arbeitsreservoir 12 erhöht angeordnet, wobei die Hydraulikleitung 14 an einer Unterseite des Hilfsreservoirs 16 angeschlossen ist, sodass sich das Hilfsreservoir 16 vollständig in Richtung des Arbeitsspeichers 12 entleeren lässt.In order to allow a free flow back and forth of the hydraulic fluid between the two
Die Hydraulikflüssigkeit wird mittels einer Ladeölpumpe 18 über einen zwischengeschalteten Ölfilter 20 einem in dem landwirtschaftlichen Nutzfahrzeug vorhandenen Verbrennungsmotor 22 sowie weiteren leistungsübertragenden Komponenten zum Zwecke der Schmierung zugeführt. Eine dem Ölfilter 20 nachgeschaltete regelbare Hochdruckpumpe 24 dient der Versorgung hydraulisch betriebener Fahrzeugaggregate 26, beispielsweise einer Lenk- und Bremsanlage oder einem an dem landwirtschaftlichen Nutzfahrzeug anbringbaren Anbaugerät, das hydraulische Stellzylinder oder dergleichen aufweist. Nicht (mehr) benötigte bzw. überschüssige Hydraulikflüssigkeit wird hierbei über nicht dargestellte Leitungen in das Arbeitsreservoir 12 zurückgeführt.The hydraulic fluid is supplied by means of a charging
Des Weiteren ist eine Luftfördereinrichtung 28 vorhanden, die niederdruckseitig einerseits mit einer in einen flüssigkeitsfreien Bereich 30 des Hilfsreservoirs 16 mündenden Ansaugleitung 32 verbunden ist, sodass sich gegenüber dem atmosphärischen Umgebungsdruck ein Unterdruck in dem Hilfsreservoir 16 aufbauen lässt, und die andererseits mit einer Steuerleitung 34 verbunden ist, die mehrere gleichartige, als Drosselventile ausgebildete Steueröffnungen 36a sowie eine durch ein nach unten offenes Ende der Steuerleitung 34 gebildete Steueröffnung 36b aufweist, wobei die Steueröffnungen 36a und 36b zumindest vor Inbetriebnahme der Luftfördereinrichtung 28, also vor Aufbau des Unterdrucks im Hilfsreservoir 16, von der im Arbeitsreservoir 12 befindlichen Hydraulikflüssigkeit vollständig bedeckt sind.Furthermore, there is an
Dieser Zustand ist in
Wird die Luftfördereinrichtung 28 in Betrieb genommen, so fließt aufgrund des im Hilfsreservoir 16 aufgebauten Unterdrucks Hydraulikflüssigkeit vom Arbeitsreservoir 12 entgegen der Wirkung der Schwerkraft über die Hydraulikleitung 14 in das Hilfsreservoir 16. Hierbei fällt der Flüssigkeitspegel im Arbeitsreservoir 12, sodass sukzessive die Steueröffnungen 36a und danach die Steueröffnung 36b freigelegt werden und der in der Ansaugleitung 32 aufgebaute Unterdruck infolge der über die Steuerleitung 34 aus der Umgebung angesaugten Luft auf einen vom Strömungswiderstand der freigelegten Steueröffnungen 36a und 36b abhängigen und zur Einstellung bzw. Einregelung einer entsprechenden Gleichgewichtslage des Flüssigkeitspegels im Arbeitsreservoir 12 führenden Wert abfällt. Dieser Zustand ist in
Beispielsgemäß sind die Steueröffnungen 36a und 36b übereinander in einem in das Arbeitsreservoir 12 hineinragenden Endbereich 38 der Steuerleitung 34 angeordnet. Die Steueröffnungen 36a sind in der Steuerleitung 34 als kreis- oder schlitzförmige Einlässe ausgebildet, wobei letztere in Längsrichtung der Steuerleitung 34 orientiert sind. Die durch das offene Ende der Steuerleitung 34 gebildete Steueröffnung 36b weist typischerweise einen Durchmesser in der Größenordnung von 25 Millimetern auf.According to the example, the
An dieser Stelle sei angemerkt, dass die Darstellung mehrerer Steueröffnungen 36a und 36b lediglich beispielhaften Charakter hat. Alternativ ist es auch denkbar, lediglich eine einzelne Steueröffnung 36b in Gestalt eines nach unten offenen Endes der Steuerleitung 34 vorzusehen.It should be noted at this point that the representation of a plurality of
Bei der Luftfördereinrichtung 28 handelt es sich um eine elektrisch oder mittels des Verbrennungsmotors 22 des landwirtschaftlichen Nutzfahrzeugs angetriebene Vakuumpumpe herkömmlicher Bauart. Diese erzeugt im Hilfsreservoir 16 einen Unterdruck in der Größenordnung von typischerweise 50 mbar.The
Gemäß einer vorteilhaften Weiterbildung der erfindungsgemäßen Anordnung 10 ist die Steuerleitung 34 im Bereich der Steueröffnungen 36a und 36b von einem Abschirmelement 40 umgeben. Bei dem Abschirmelement 40 handelt es sich um ein zylindrisches Abschirmrohr 42, das an seinem unteren Ende mittels eines flüssigkeitsdurchlässigen Gitters 44 verschlossen ist. Das zylindrische Abschirmrohr 42 ist derart bemessen, dass dieses gemeinsam mit der Steuerleitung 34 einen nach oben hin offenen Ringspalt 46 ausbildet, über den die Steueröffnungen 36a und 36b mit der im Arbeitsreservoir 12 befindlichen Hydraulikflüssigkeit kommunizieren können.According to an advantageous development of the
Bei einer übermäßigen Befüllung des Arbeitsreservoirs 12 mit Hydraulikflüssigkeit besteht die Möglichkeit, dass der Flüssigkeitspegel im Arbeitsreservoir 12 nach Inbetriebnahme der Luftfördereinrichtung 28 aufgrund des begrenzten Fassungsvermögens des Hilfsreservoirs 16 nicht ausreichend zu fallen vermag, um die Steueröffnungen 36a und insbesondere die Steueröffnung 36b freizulegen. Um einem unerwünschten Eindringen von Hydraulikflüssigkeit in die Ansaugleitung 32 bzw. die Steuerleitung 34 und damit letztlich in die Luftfördereinrichtung 28 vorzubeugen, ist in der Ansaugleitung 32 bzw. Steuerleitung 34 jeweils ein Drosselventil 48 bzw. 50 angeordnet, das den mittels der Luftfördereinrichtung 28 aufgebauten Unterdruck bei Einritt von Hydraulikflüssigkeit derart erhöht, dass ein zwischen dem Drosselventil 48 bzw. 50 und der Luftfördereinrichtung 28 angeordnetes Druckbegrenzungsventil 52 bei Überschreiten eines vorgegebenen Unterdrucks durchlässig wird und dabei eine Druckausgleichsverbindung zwischen der Niederdruckseite der Luftfördereinrichtung 28 und dem Arbeitsreservoir 12 herstellt. Das Druckbegrenzungsventil 52 ist zu diesem Zweck unmittelbar in einem flüssigkeitsfreien Bereich des Arbeitsreservoirs 12 angeordnet. Bei dem Druckbegrenzungsventil 52 handelt es sich um ein herkömmliches Einwegventil.With excessive filling of the working
Bei niedrigen Betriebstemperaturen und dadurch bedingter erhöhter Viskosität der Hydraulikflüssigkeit ist es möglich, dass nach Inbetriebnahme der Luftfördereinrichtung 28 die in der Steuerleitung 34 befindliche Hydraulikflüssigkeit nicht in Richtung des Arbeitsreservoirs 12 abzufließen und der Flüssigkeitspegel im Arbeitsreservoir 12 in der Folge keine stabile Gleichgewichtslage einzunehmen vermag. Dies kann letztlich zur Überfüllung des Hilfsreservoirs 16 und damit zu einem Eindringen von Hydraulikflüssigkeit über die Ansaugleitung 32 in die damit verbundene Luftfördereinrichtung 28 führen. Es ist daher in der Steuerleitung 34 ein in einen flüssigkeitsfreien Bereich des Arbeitsreservoirs 12 mündendes Drosselventil 60 vorgesehen, das bei niedrigen Betriebstemperaturen und dadurch bedingter erhöhter Viskosität der Hydraulikflüssigkeit in Verbindung mit dem Druckbegrenzungsventil 52 (vergleichbar dem Drosselventil 54) verhindert, dass bei Inbetriebnahme der Luftfördereinrichtung 28 ein übermäßiger Unterdruck in der Ansaugleitung 32 aufgebaut wird. Der Strömungswiderstand des Drosselventils 60 ist derart bemessen, dass bei normalen Betriebstemperaturen ein ausreichender Unterdruck in der mit der Steuerleitung 34 verbundenen Ansaugleitung 32 und damit im Hilfsreservoir 16 aufgebaut werden kann.At low operating temperatures and consequent increased viscosity of the hydraulic fluid, it is possible that after starting the
Claims (16)
- Arrangement for supplying hydraulic liquid to a hydraulic system, having a working reservoir (12) for accommodating the hydraulic liquid provided for the operation of the hydraulic system, and having an auxiliary reservoir (16), which is connected to the working reservoir (12) via a hydraulic line (14), for temporarily storing hydraulic liquid extracted from the working reservoir (12), wherein an air delivery device (28) is provided which is connected at the low-pressure side firstly to an intake line (32) which opens into a liquid-free region (30) of the auxiliary reservoir (16), such that a negative pressure in relation to the atmospheric ambient pressure can be built up in the auxiliary reservoir (16), characterized in that the air delivery device (28) is connected secondly to a control line (34) which has a control opening (36a, 36b) which, at least before the air delivery device (28) is started up, is covered by the hydraulic liquid situated in the working reservoir (12).
- Arrangement according to Claim 1, characterized in that the hydraulic line (14) extends between a lower region of the working reservoir (12) and a lower region of the auxiliary reservoir (16).
- Arrangement according to either of Claims 1 and 2, characterized in that the intake line (32) opens out directly into or is directly connected to the control line (34).
- Arrangement according to one of Claims 1 to 3, characterized in that the control opening (36a, 36b) in the control line (34) is formed as a circular or slot-shaped inlet.
- Arrangement according to one of Claims 1 to 4, characterized in that the control opening (36a, 36b) is formed in an end region (38), which projects into the working reservoir (12), of the control line (34).
- Arrangement according to one of Claims 1 to 5, characterized in that a plurality of control openings (36a, 36b) are formed in that end region (38) of the control line (34) which projects into the working reservoir (12), the control openings (36a, 36b) being arranged one above the other.
- Arrangement according to one of Claims 1 to 6, characterized in that the control opening (36a) is formed as a throttle valve.
- Arrangement according to one of Claims 1 to 7, characterized in that the control line (34) is surrounded, in the region of the control opening (36a, 36b), by a shield element (40).
- Arrangement according to one of Claims 1 to 8, characterized in that the shield element (40) is a cylindrical shield tube (42).
- Arrangement according to one of Claims 1 to 9, characterized in that the cylindrical shield tube (42) is closed off at its lower end by means of a liquid-permeable grate (44).
- Arrangement according to one of Claims 1 to 10, characterized in that the cylindrical shield tube (42) is dimensioned so as to form, together with the control line (34), an upwardly open annular gap (46) via which the control opening (36a, 36b) can communicate with the hydraulic liquid situated in the working reservoir (12).
- Arrangement according to one of Claims 1 to 11, characterized in that a throttle valve (48, 50, 54) is arranged in the intake line (32) and/or the control line (34).
- Arrangement according to one of Claims 1 to 12, characterized in that a check valve (58) is arranged in the intake line (32) and/or in the control line (34).
- Arrangement according to one of Claims 1 to 13, characterized in that a throttle valve (60) which opens into a liquid-free region of the working reservoir (12) is provided in the control line (34).
- Arrangement according to one of Claims 1 to 14, characterized in that a pressure limiting valve (52) is arranged between the throttle valve (48, 50, 54, 60) and the air delivery device (28), or between the check valve (58) and the air delivery device (28), in such a way that a pressure-equalizing connection can be produced between the low-pressure side of the air delivery device (28) and the working reservoir (12).
- Motor vehicle, in particular agricultural utility vehicle, having an arrangement (10) for supplying hydraulic liquid to a hydraulic system according to one of Claims 1 to 15.
Priority Applications (1)
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PL09168925T PL2161458T3 (en) | 2008-09-03 | 2009-08-28 | Assembly for supplying a hydraulic system with hydraulic fluid |
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DE102008041799 | 2008-09-03 | ||
DE102008043449 | 2008-11-04 |
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US (2) | US8151818B2 (en) |
EP (1) | EP2161458B1 (en) |
AT (1) | ATE523696T1 (en) |
DE (1) | DE102009001448A1 (en) |
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DE102009001448A1 (en) * | 2008-09-03 | 2010-03-04 | Deere & Company, Moline | Arrangement for supplying a hydraulic system with hydraulic fluid |
US9599127B2 (en) * | 2009-03-10 | 2017-03-21 | Deere & Company | Hydraulic circuit supply system |
JP5905295B2 (en) * | 2012-02-27 | 2016-04-20 | 三菱重工プラスチックテクノロジー株式会社 | Hydraulic oil storage device and injection molding device |
US9890847B2 (en) * | 2015-04-30 | 2018-02-13 | Deere & Company | Anti-siphon arrangement for hydraulic systems |
FR3112178B1 (en) * | 2020-07-02 | 2022-07-29 | Safran Landing Systems | Device for filling a hydraulic circuit of an electro-hydrostatic system and method of filling implementing such a device |
CN113375060B (en) * | 2021-06-06 | 2022-07-19 | 中国长江电力股份有限公司 | Emergency oil supplementing device and method for pressure container of hydraulic system of hydraulic turbine governor |
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DE2822209A1 (en) * | 1978-05-22 | 1979-11-29 | Barmag Barmer Maschf | Lubricating oil circulation system for IC engine - uses finely divided oil stream part, representing less than 10 per cent of total, passing through large vacuum chamber |
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US4445829A (en) * | 1980-12-15 | 1984-05-01 | Miller James D | Apparatus for dampening pump pressure pulsations |
US5335704A (en) * | 1992-06-09 | 1994-08-09 | Safeway Stores, Inc. | Pasteurized to raw liquid processing system |
SE9303680L (en) * | 1993-05-25 | 1994-11-26 | Haakan Ingvast Produktutveckli | Liquid-cured system with device for degassing the liquid |
EP1214215B1 (en) * | 1999-09-21 | 2003-11-05 | Federal-Mogul Corporation | Fuel transfer pump and control |
US6845782B2 (en) * | 2002-10-11 | 2005-01-25 | International Truck Intellectual Property Company, Llc | Multiple tank circulating fuel system |
WO2008089217A2 (en) * | 2007-01-18 | 2008-07-24 | Putzmeister America, Inc. | Hydraulic fluid dehydration system and method including pre-heating |
DE102007033419B4 (en) * | 2007-07-18 | 2016-03-24 | Audi Ag | Dry sump lubrication device for an internal combustion engine |
DE102009001448A1 (en) * | 2008-09-03 | 2010-03-04 | Deere & Company, Moline | Arrangement for supplying a hydraulic system with hydraulic fluid |
-
2009
- 2009-03-10 DE DE200910001448 patent/DE102009001448A1/en not_active Withdrawn
- 2009-08-28 PL PL09168925T patent/PL2161458T3/en unknown
- 2009-08-28 ES ES09168925T patent/ES2373081T3/en active Active
- 2009-08-28 AT AT09168925T patent/ATE523696T1/en active
- 2009-08-28 EP EP20090168925 patent/EP2161458B1/en active Active
- 2009-09-01 US US12/551,725 patent/US8151818B2/en active Active
-
2010
- 2010-03-05 US US13/255,940 patent/US20120006432A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP2161458A3 (en) | 2010-08-04 |
PL2161458T3 (en) | 2012-02-29 |
DE102009001448A1 (en) | 2010-03-04 |
ES2373081T3 (en) | 2012-01-31 |
US8151818B2 (en) | 2012-04-10 |
ATE523696T1 (en) | 2011-09-15 |
US20100051123A1 (en) | 2010-03-04 |
US20120006432A1 (en) | 2012-01-12 |
EP2161458A2 (en) | 2010-03-10 |
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