EP1293669A2 - Hydraulic vehicle steering pump driven by combustion engine - Google Patents
Hydraulic vehicle steering pump driven by combustion engine Download PDFInfo
- Publication number
- EP1293669A2 EP1293669A2 EP02019785A EP02019785A EP1293669A2 EP 1293669 A2 EP1293669 A2 EP 1293669A2 EP 02019785 A EP02019785 A EP 02019785A EP 02019785 A EP02019785 A EP 02019785A EP 1293669 A2 EP1293669 A2 EP 1293669A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- steering
- pump
- pressure
- steering pump
- actuator
- 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
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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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
-
- 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
Definitions
- the invention relates to a mobile machine, in particular an industrial truck an internal combustion engine and a hydraulic steering pump driven by it for feeding a steering actuator.
- the steering system is supplied by forklift trucks powered by internal combustion engines with hydraulic energy is carried out by a steering pump, its delivery volume is measured at the lower idling speed of the internal combustion engine. at this speed the steering pump already delivers sufficient pressure medium to the Steering actuator to be able to supply so far that a minimum steering speed is achieved. In principle, this leads to large-volume steering pumps, one have high torque requirements. With increasing operating speed of the internal combustion engine considerable energy losses arise because more pressure medium from the Steering pump is promoted as the steering actuator is required. In forklifts where the hydraulic pump not only the steering cylinder but also working hydraulics The entire pressure medium is always supplied (priority valve circuit), including that amount required for working hydraulics, pressurized. This also leads to Energy losses and to heat up the entire hydraulic system.
- the object of the present invention is a mobile work machine of the type mentioned at the outset, in which the energy losses which caused by the steering system are minimized.
- a hydraulic accumulator is connected to the steering pump and the steering actuator and that the specific Delivery volume of the steering pump is dimensioned so that the operation of the steering actuator at low operating speeds of the internal combustion engine, the feeding of pressure medium from the steering pump and the memory required and if one is exceeded Threshold speed of operation of the steering cylinder by feeding in only Pressure fluid from the steering pump is possible.
- the idea essential to the invention is therefore the specific funding volume the steering pump, i.e. the delivery volume per revolution, to be significantly reduced and to provide a sufficiently large storage as compensation, which is loaded by the steering pump and from which in certain operating states, namely at low operating speeds of the internal combustion engine, additionally to the steering pump pressure medium is fed into the steering actuator.
- the delivery volume of the steering pump can be halved or divided into three. In order to the energy losses and the torque requirement of the steering pump are the same Reduced dimensions.
- the steering pump is smaller and takes up less space in the work machine.
- the torque requirements for the internal combustion engine are particularly in the area lower operating speeds, which reduces the use of small-sized turbo engines enables, especially in this operating area rather weak torque are. Overall, the energy losses in the steering circuit are significantly reduced.
- the volume of the memory is expediently dimensioned such that when it is alone
- the steering actuator is fed several times by pressure medium from the full memory Operating the steering actuator from stop to stop is possible. This is an emergency power supply to the steering actuator if the internal combustion engine fails or the steering pump. No additional effort is required of the driver of the working machine in order to use the emergency energy supply.
- the threshold speed of the internal combustion engine is advantageously in the middle range Operating speeds.
- the one provided by the steering pump is sufficient Volume flow (product of specific delivery volume and speed of the internal combustion engine) to power the steering actuator without using the memory.
- the specific delivery volume of the steering pump is measured, for example, in In the case of a forklift truck based on the volume flow that the steering actuator produces Stacker working game in the range of this average operating speed of the internal combustion engine requires.
- the steering pump can be designed as a constant pump, the one Conveyor pressure-controlled pressure compensator connected between two switch positions is, with the steering pump in the first switching position of the pressure compensator the steering actuator and in the second switching position is connected to a tank.
- Steering pump is designed as a variable displacement pump.
- a demand flow control enables this the variable pump minimizes circulation losses.
- the mobile work machine according to the invention can be used, for example, as a forklift be trained.
- An internal combustion engine 1 drives a steering pump 2, the delivery line 3 shows, for example, a hydraulic steering actuator designed as a steering cylinder 4 is connected, which can be actuated by an upstream steering control valve 5.
- a Storage 7 Downstream of a check valve 6 opening in the direction of the steering actuator 4 is a Storage 7 to the delivery line 3 and thus to the steering pump 2 and the steering actuator 4 connected.
- the circuit is a pressure relief valve 8 and a filter 9 at the output of the steering pump 2 added.
- a pressure sensor 10 is provided which detects the pressure in the delivery line 3 measures downstream of the check valve 6 and thus also the pressure in the accumulator 7 Pressure sensor 10 is with a brake system, not shown in the figures Working machine in operative connection.
- the specific delivery volume of the steering pump 2 i.e. the delivery volume per revolution, is dimensioned so that the operation of the steering actuator 4 below one certain threshold speed of the internal combustion engine 1 only by parallel Feed of pressure medium from both the steering pump 2 and from the memory 7 takes place.
- the memory 7 loaded by the steering pump 2.
- the steering pump 2 When the threshold speed is reached, the steering pump 2 promotes a volume flow, which is sufficient to the steering actuator 4 without pressure medium from the memory 7 Food. At higher operating speeds (above the threshold speed) from the steering pump 2 delivered more pressure medium than for actuating the steering actuator 4 necessary. The excess pressure medium loads the memory 7 or is via the pressure relief valve 8 drained into the tank.
- the steering pump 2 designed as a constant pump is followed by a pressure compensator 11 controlled by the pressure in the delivery line 3 is movable between two switch positions.
- the steering pump 2 is in the first Switch position with the steering actuator 4 and in the second switch position with a Tank T connected. This causes the losses when the steering actuator 4 is not actuated reduced.
- the steering pump 2 it is also possible to use the steering pump 2 as a variable displacement pump train and provide with a demand flow control. Here the pump always set to the lowest possible funding volume.
- Figure 3 shows an embodiment of the invention, in the downstream of the check valve 6 branches off from the delivery line 3 a line 12 which leads to a cylinder of a working hydraulic system 13 leads.
- This can be, for example, the lifting cylinder Acting forklift.
- a control valve arrangement 14 is connected upstream of the working hydraulics 13.
- it is possible in principle to extract energy from the Working hydraulics 13 (e.g. potential energy of a load) for operating the steering and / or to load the memory 7.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid-Pressure Circuits (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Die Erfindung betrifft eine mobile Arbeitmaschine, insbesondere Flurförderzeug, mit einem Verbrennungsmotor und einer davon angetriebenen hydraulischen Lenkpumpe zur Speisung eines Lenkaktuators.The invention relates to a mobile machine, in particular an industrial truck an internal combustion engine and a hydraulic steering pump driven by it for feeding a steering actuator.
Die Versorgung der Lenkanlage von verbrennungsmotorisch betriebenen Gabelstaplern mit hydraulischer Energie erfolgt durch eine Lenkpumpe, deren Fördervolumen an der unteren Leerlaufdrehzahl des Verbrennungsmotors bemessen ist. Bei dieser Drehzahl fördert die Lenkpumpe bereits ausreichend Druckmittel, um den Lenkaktuator so weit versorgen zu können, dass eine Mindestlenkgeschwindigkeit erreicht wird. Prinzipbedingt führt dies zu großvolumigen Lenkpumpen, die einen hohen Drehmomentbedarf aufweisen. Bei ansteigender Betriebsdrehzahl des Verbrennungsmotors entstehen erhebliche Energieverluste, da mehr Druckmittel von der Lenkpumpe gefördert wird als der Lenkaktuator benötigt. In Gabelstaplern, in denen die hydraulische Pumpe nicht nur den Lenkzylinder sondern auch eine Arbeitshydraulik versorgt (Prioritätsventilschaltung), wird immer das gesamte Druckmittel, also auch die für die Arbeitshydraulik benötigte Menge, unter Druck gesetzt. Auch dies führt zu Energieverlusten und zum Aufheizen des gesamten Hydrauliksystems.The steering system is supplied by forklift trucks powered by internal combustion engines with hydraulic energy is carried out by a steering pump, its delivery volume is measured at the lower idling speed of the internal combustion engine. at this speed the steering pump already delivers sufficient pressure medium to the Steering actuator to be able to supply so far that a minimum steering speed is achieved. In principle, this leads to large-volume steering pumps, one have high torque requirements. With increasing operating speed of the internal combustion engine considerable energy losses arise because more pressure medium from the Steering pump is promoted as the steering actuator is required. In forklifts where the hydraulic pump not only the steering cylinder but also working hydraulics The entire pressure medium is always supplied (priority valve circuit), including that amount required for working hydraulics, pressurized. This also leads to Energy losses and to heat up the entire hydraulic system.
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine mobile Arbeitsmaschine der eingangs genannten Art zur Verfügung zu stellen, bei der die Energieverluste, die vom Lenksystem verursacht werden, minimiert sind.The object of the present invention is a mobile work machine of the type mentioned at the outset, in which the energy losses which caused by the steering system are minimized.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass ein hydraulischer Speicher an die Lenkpumpe und den Lenkaktuator angeschlossen ist und dass das spezifische Fördervolumen der Lenkpumpe so bemessen ist, dass der Betrieb des Lenkaktuators bei geringen Betriebsdrehzahlen des Verbrennungsmotors das Einspeisen von Druckmittel aus der Lenkpumpe und dem Speicher erfordert und bei Überschreiten einer Schwellendrehzahl der Betrieb des Lenkzylinders durch alleiniges Einspeisen von Druckmittel aus der Lenkpumpe möglich ist. This object is achieved in that a hydraulic accumulator is connected to the steering pump and the steering actuator and that the specific Delivery volume of the steering pump is dimensioned so that the operation of the steering actuator at low operating speeds of the internal combustion engine, the feeding of pressure medium from the steering pump and the memory required and if one is exceeded Threshold speed of operation of the steering cylinder by feeding in only Pressure fluid from the steering pump is possible.
Der erfindungswesentliche Gedanke besteht demnach darin, das spezifische Fördervolumen der Lenkpumpe, also das Fördervolumen pro Umdrehung, deutlich zu reduzieren und als Ausgleich einen ausreichend groß dimensionierten Speicher vorzusehen, der durch die Lenkpumpe geladen wird und aus dem in bestimmten Betriebszuständen, nämlich bei niedrigen Betriebsdrehzahlen des Verbrennungsmotors, zusätzlich zur Lenkpumpe Druckmittel in den Lenkaktuator eingespeist wird. Im Idealfall kann dadurch das Fördervolumen der Lenkpumpe halbiert bis gedrittelt werden. Damit werden die Energieverluste und der Drehmomentbedarf der Lenkpumpe im gleichen Maße reduziert. Die Lenkpumpe baut kleiner und benötigt weniger Platz in der Arbeitsmaschine.The idea essential to the invention is therefore the specific funding volume the steering pump, i.e. the delivery volume per revolution, to be significantly reduced and to provide a sufficiently large storage as compensation, which is loaded by the steering pump and from which in certain operating states, namely at low operating speeds of the internal combustion engine, additionally to the steering pump pressure medium is fed into the steering actuator. Ideally the delivery volume of the steering pump can be halved or divided into three. In order to the energy losses and the torque requirement of the steering pump are the same Reduced dimensions. The steering pump is smaller and takes up less space in the work machine.
Die Drehmomentanforderung an den Verbrennungsmotor sind besonders im Bereich niedriger Betriebsdrehzahlen verringert, was den Einsatz von klein bauenden Turbo-Motoren ermöglicht, die gerade in diesem Betriebsbereich eher drehmomentschwach sind. Insgesamt sind die Energieverluste im Lenkungskreislauf deutlich herabgesetzt.The torque requirements for the internal combustion engine are particularly in the area lower operating speeds, which reduces the use of small-sized turbo engines enables, especially in this operating area rather weak torque are. Overall, the energy losses in the steering circuit are significantly reduced.
Zweckmäßigerweise ist das Volumen des Speichers so bemessen, dass bei alleiniger Speisung des Lenkaktuators durch Druckmittel aus dem vollen Speicher ein mehrfaches Betätigen des Lenkaktuators von Anschlag zu Anschlag möglich ist. Dadurch ist eine Notenergieversorgung des Lenkaktuators bei Ausfall des Verbrennungsmotors oder der Lenkpumpe sichergestellt. Es bedarf dabei keiner zusätzlichen Kraftanstrengung des Fahrers der Arbeitsmaschine, um die Notenergieversorgung einzusetzen.The volume of the memory is expediently dimensioned such that when it is alone The steering actuator is fed several times by pressure medium from the full memory Operating the steering actuator from stop to stop is possible. This is an emergency power supply to the steering actuator if the internal combustion engine fails or the steering pump. No additional effort is required of the driver of the working machine in order to use the emergency energy supply.
Es erweist sich als günstig, wenn ein den Druck im Speicher direkt oder indirekt erfassender Drucksensor vorgesehen ist, der in Wirkverbindung mit einer Bremsanlage der Arbeitsmaschine steht, wobei bei Unterschreiten eines Druck-Grenzwertes ein zwangsgesteuerter Bremsvorgang auslösbar ist. Bei Druckverlust im Lenkungskreislauf wird die Arbeitsmaschine somit in einen sicheren Zustand gebracht.It proves to be advantageous if one that directly or indirectly detects the pressure in the memory Pressure sensor is provided, which is in operative connection with a brake system Working machine stands, whereby if a pressure limit is undershot, a positively controlled Braking is triggered. If there is pressure loss in the steering circuit the working machine is thus brought into a safe state.
Die Schwellendrehzahl des Verbrennungsmotors liegt mit Vorteil im Bereich der mittleren Betriebsdrehzahlen. Hierbei reicht der von der Lenkpumpe zur Verfügung gestellte Volumenstrom (Produkt aus spezifischem Fördervolumen und Drehzahl des Verbrennungsmotors) aus, um ohne Einsatz des Speichers den Lenkaktuator zu versorgen. Das spezifische Fördervolumen der Lenkpumpe bemisst sich dabei beispielsweise im Falle eines Gabelstaplers nach dem Volumenstrom, den der Lenkaktuator bei einem Staplerarbeitsspiel im Bereich dieser mittleren Betriebsdrehzahl des Verbrennungsmotors erfordert.The threshold speed of the internal combustion engine is advantageously in the middle range Operating speeds. The one provided by the steering pump is sufficient Volume flow (product of specific delivery volume and speed of the internal combustion engine) to power the steering actuator without using the memory. The specific delivery volume of the steering pump is measured, for example, in In the case of a forklift truck based on the volume flow that the steering actuator produces Stacker working game in the range of this average operating speed of the internal combustion engine requires.
Um die Energieverluste weiter zu minmieren, kann gemäß einer vorteilhaften Ausgestaltung der Erfindung die Lenkpumpe als Konstantpumpe ausgebildet sein, der eine förderdruckgesteuerte, zwischen zwei Schaltstellungen bewegliche Druckwaage nachgeschaltet ist, wobei die Lenkpumpe in der ersten Schaltstellung der Druckwaage mit dem Lenkaktuator und in der zweiten Schaltstellung mit einem Tank verbunden ist.In order to further minimize the energy losses, according to an advantageous embodiment the invention, the steering pump can be designed as a constant pump, the one Conveyor pressure-controlled pressure compensator connected between two switch positions is, with the steering pump in the first switching position of the pressure compensator the steering actuator and in the second switching position is connected to a tank.
Eine andere, nicht minder günstige Ausgestaltung der Erfindung sieht vor, dass die Lenkpumpe als Verstellpumpe ausgebildet ist. Hierbei ermöglicht eine Bedarfsstromregelung der Verstellpumpe die Minimierung von Umlaufverlusten.Another, no less favorable embodiment of the invention provides that the Steering pump is designed as a variable displacement pump. A demand flow control enables this the variable pump minimizes circulation losses.
Sofern eine Arbeitshydraulik mit vorgeschalteter Steuerventilanordnung an die Lenkpumpe und den Lenkaktuator angeschlossen ist, kann unter bestimmten Bedingungen Energie aus der Arbeitshydraulik in die Lenkhydraulik einspeist werden. So ist es beispielsweise bei einem Gabelstapler möglich, potentielle Energie des höhenbeweglichen Lastträgers und/oder der Last zu nutzen, um den Speicher zu laden und/oder den Lenkaktuator zu betätigen..If a working hydraulic system with an upstream control valve arrangement to the steering pump and the steering actuator is connected, under certain conditions Energy from the working hydraulics can be fed into the steering hydraulics. For example, it is possible with a forklift, potential energy of the height-adjustable To use the load carrier and / or the load to load the memory and / or to actuate the steering actuator ..
Weitere Vorteile und Einzelheiten der Erfindung werden anhand des in den schematischen Figuren dargestellten Ausführungsbeispieles näher erläutert. Dabei zeigt:
Figur 1- einen Schaltplan einer hydraulischen Lenkanlage einer erfindungsgemäßen mobilen Arbeitsmaschine,
Figur 2- eine erste Variante der Schaltung gemäß
Figur 1 und Figur 3- eine zweite Variante der Schaltung gemäß
Figur 1.
- Figure 1
- 1 shows a circuit diagram of a hydraulic steering system of a mobile working machine according to the invention,
- Figure 2
- a first variant of the circuit of Figure 1 and
- Figure 3
- a second variant of the circuit according to Figure 1.
Die erfindungsgemäße mobile Arbeitsmaschine kann beispielsweise als Gabelstapler
ausgebildet sein. Ein Verbrennungsmotor 1 treibt eine Lenkpumpe 2 an, deren Förderleitung
3 ein bespielsweise als Lenkzylinder ausgebildeter hydraulischer Lenkaktuator
4 angeschlossen ist, der durch ein vorgeschaltetes Lenksteuerventil 5 betätigbar ist. The mobile work machine according to the invention can be used, for example, as a forklift
be trained. An
Stromab eines in Richtung zum Lenkaktuator 4 öffnenden Rückschlagventils 6 ist ein
Speicher 7 an die Förderleitung 3 und somit an die Lenkpumpe 2 und an den Lenkaktuator
4 angeschlossen. Die Schaltung wird durch ein Druckbegrenzungsventil 8 und
ein Filter 9 am Ausgang der Lenkpumpe 2 ergänzt. Ferner ist im vorliegenden Ausführungsbeispiel
ein Drucksensor 10 vorgesehen, der den Druck in der Förderleitung 3
stromab des Rückschlagventils 6 misst und damit auch den Druck im Speicher 7. Der
Drucksensor 10 steht mit einer in den Figuren nicht dargestellten Bremsanlage der
Arbeitsmaschine in Wirkverbindung.Downstream of a check valve 6 opening in the direction of the steering actuator 4 is a
Das spezifische Fördervolumen der Lenkpumpe 2, also das Fördervolumen pro Umdrehung,
ist so dimensioniert, dass der Betrieb des Lenkaktuators 4 unterhalb einer
bestimmten Schwellendrehzahl des Verbrennungsmotors 1 nur durch parallele
Einspeisung von Druckmittel sowohl aus der Lenkpumpe 2 als auch aus dem Speicher
7 erfolgt. Bei nicht betätigter Lenkung wird in diesem Betriebszustand der Speicher 7
von der Lenkpumpe 2 geladen.The specific delivery volume of the
Bei Erreichen der Schwellendrehzahl fördert die Lenkpumpe 2 einen Volumenstrom,
der ausreicht, um den Lenkaktuator 4 ohne Druckmittel aus dem Speicher 7 zu
speisen. Bei höheren Betriebsdrehzahlen (oberhalb der Schwellendrehzahl) wird von
der Lenkpumpe 2 mehr Druckmittel gefördert als zur Betätigung des Lenkaktuators 4
nötig. Das überschüssige Druckmittel lädt den Speicher 7 oder wird über das Druckbegrenzungsventil
8 in den Tank abgelassen.When the threshold speed is reached, the
Fällt die Lenkpumpe 2 aus, so ist es bei vollem Speicher 7 noch möglich, den Lenkaktuator
4 mehrmals von Anschlag zu Anschlag zu betätigen. Aus Sicherheitsgründen
ist es auch empfehlenswert, wie in Figur 1 dargestellt, die Energieversorgung des
elektromagnetisch betätigbaren Lenksteuerventils 4 durch den Einsatz von Doppelmagneten
M1, M2 zweikreisig auszuführen.If the
Sofern ein bestimmtes Druckniveau in der Förderleitung 3 unterschritten wird, löst das
von dem Drucksensor 10 erfasste Drucksignal eine Zwangsbremsung der Arbeitsmaschine
aus, um sicher zu stellen, dass keine gefährlichen Fahrzustände entstehen.If a certain pressure level in the
Bei der Variante gemäß Figur 2 ist der als Konstantpumpe ausgebildeten Lenkpumpe 2
eine vom Druck in der Förderleitung 3 gesteuerte Druckwaage 11 nachgeschaltet, die
zwischen zwei Schaltstellungen beweglich ist. Hierbei ist die Lenkpumpe 2 in der ersten
Schaltstellung mit dem Lenkaktuator 4 und in der zweiten Schaltstellung mit einem
Tank T verbunden. Dadurch werden bei nicht betätigtem Lenkaktuator 4 die Verluste
reduziert. Alternativ dazu ist es auch möglich, die Lenkpumpe 2 als Verstellpumpe
auszubilden und mit einer Bedarfsstromregelung zu versehen. Hierbei wird die Pumpe
stets auf ein möglichst geringes Fördervolumen eingestellt.In the variant according to FIG. 2, the
Figur 3 zeigt eine Ausgestaltung der Erfindung, bei der stromab des Rückschlagventils
6 von der Förderleitung 3 eine Leitung 12 abzweigt, die zu einem Zylinder einer Arbeitshydraulik
13 führt. Dabei kann es sich beispielsweise um den Hubzylinder eines
Gabelstaplers handeln. Der Arbeitshydraulik 13 ist eine Steuerventilanordnung 14 vorgeschaltet.
Mit dieser Variante der Erfindung ist es im Prinzip möglich, Energie aus der
Arbeitshydraulik 13 (z. B. potentielle Energie einer Last) zum Betreiben der Lenkung
und/oder zum Laden des Speichers 7 zu nutzen.Figure 3 shows an embodiment of the invention, in the downstream of the check valve
6 branches off from the delivery line 3 a
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001145992 DE10145992A1 (en) | 2001-09-18 | 2001-09-18 | Mobile work machine with an internal combustion engine and a hydraulic steering pump driven by it |
DE10145992 | 2001-09-18 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1293669A2 true EP1293669A2 (en) | 2003-03-19 |
EP1293669A3 EP1293669A3 (en) | 2005-04-13 |
EP1293669B1 EP1293669B1 (en) | 2007-04-11 |
Family
ID=7699435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020019785 Expired - Lifetime EP1293669B1 (en) | 2001-09-18 | 2002-09-04 | Hydraulic vehicle steering pump driven by combustion engine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1293669B1 (en) |
DE (2) | DE10145992A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102305222A (en) * | 2011-08-24 | 2012-01-04 | 天津大学 | Electro-hydraulic variable valve device with energy accumulator buffer function and energy storage method thereof |
EP2420626A1 (en) | 2010-08-19 | 2012-02-22 | Deere & Company | Hydraulic assembly |
CN102913412A (en) * | 2012-10-08 | 2013-02-06 | 潍坊优力动力配套有限公司 | Hydraulic water pumping unit |
CN105644620A (en) * | 2016-04-05 | 2016-06-08 | 南京林业大学 | Energy-saving constant pressure type hydraulic power steering system |
CN107246420A (en) * | 2017-07-20 | 2017-10-13 | 南京讯联智能科技有限公司 | It is a kind of to carry the integrated valve group of guide for blocking sender |
CN109591886A (en) * | 2018-11-30 | 2019-04-09 | 三汽车起重机械有限公司 | Vehicle assist steering system and automatic driving vehicle |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010042098B4 (en) | 2010-10-07 | 2021-01-07 | Zf Friedrichshafen Ag | Method for operating a drive train |
CN105545135B (en) * | 2015-02-28 | 2017-08-25 | 北京航空航天大学 | Opportunity of combat internal weapon bays hatch door transient state actuating system based on fixed displacement motor principle |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB876727A (en) * | 1958-10-29 | 1961-09-06 | Clark Equipment Co | Hydraulic power transmission systems |
EP0525329A2 (en) * | 1991-05-31 | 1993-02-03 | Praxair Technology, Inc. | Variable speed hydraulic pump system for liquid trailer |
DE19955312A1 (en) * | 1999-11-17 | 2001-06-13 | Jungheinrich Ag | Drive system for industrial trucks |
-
2001
- 2001-09-18 DE DE2001145992 patent/DE10145992A1/en not_active Withdrawn
-
2002
- 2002-09-04 EP EP20020019785 patent/EP1293669B1/en not_active Expired - Lifetime
- 2002-09-04 DE DE50209903T patent/DE50209903D1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB876727A (en) * | 1958-10-29 | 1961-09-06 | Clark Equipment Co | Hydraulic power transmission systems |
EP0525329A2 (en) * | 1991-05-31 | 1993-02-03 | Praxair Technology, Inc. | Variable speed hydraulic pump system for liquid trailer |
DE19955312A1 (en) * | 1999-11-17 | 2001-06-13 | Jungheinrich Ag | Drive system for industrial trucks |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2420626A1 (en) | 2010-08-19 | 2012-02-22 | Deere & Company | Hydraulic assembly |
DE102010039509A1 (en) | 2010-08-19 | 2012-02-23 | Deere & Company | Hydraulic arrangement |
CN102305222A (en) * | 2011-08-24 | 2012-01-04 | 天津大学 | Electro-hydraulic variable valve device with energy accumulator buffer function and energy storage method thereof |
CN102305222B (en) * | 2011-08-24 | 2014-03-26 | 天津大学 | Electro-hydraulic variable valve device with energy accumulator buffer function and energy storage method thereof |
CN102913412A (en) * | 2012-10-08 | 2013-02-06 | 潍坊优力动力配套有限公司 | Hydraulic water pumping unit |
CN105644620A (en) * | 2016-04-05 | 2016-06-08 | 南京林业大学 | Energy-saving constant pressure type hydraulic power steering system |
CN107246420A (en) * | 2017-07-20 | 2017-10-13 | 南京讯联智能科技有限公司 | It is a kind of to carry the integrated valve group of guide for blocking sender |
CN109591886A (en) * | 2018-11-30 | 2019-04-09 | 三汽车起重机械有限公司 | Vehicle assist steering system and automatic driving vehicle |
Also Published As
Publication number | Publication date |
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DE10145992A1 (en) | 2003-04-03 |
EP1293669B1 (en) | 2007-04-11 |
DE50209903D1 (en) | 2007-05-24 |
EP1293669A3 (en) | 2005-04-13 |
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