EP1293669A2 - Von einem Verbrennungsmotor angetriebene hydrauliche Lenkpumpe - Google Patents
Von einem Verbrennungsmotor angetriebene hydrauliche Lenkpumpe 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.
Landscapes
- 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
- 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.
Claims (7)
- Mobile Arbeitmaschine, insbesondere Flurförderzeug, mit einem Verbrennungsmotor und einer davon angetriebenen hydraulischen Lenkpumpe zur Speisung mindestens eines Lenkaktuators, dadurch gekennzeichnet, dass ein hydraulischer Speicher (7) an die Lenkpumpe (2) und den Lenkaktuator (4) angeschlossen ist und dass das spezifische Fördervolumen der Lenkpumpe (2) so bemessen ist, dass der Betrieb des Lenkaktuators (4) bei geringen Betriebsdrehzahlen des Verbrennungsmotors (1) das Einspeisen von Druckmittel aus der Lenkpumpe (2) und dem Speicher (7) erfordert und bei Überschreiten einer Schwellendrehzahl der Betrieb des Lenkaktuators (4) durch alleiniges Einspeisen von Druckmittel aus der Lenkpumpe (2) möglich ist.
- Mobile Arbeitsmaschine nach Anspruch 1, dadurch gekennzeichnet, dass das Volumen des Speichers (7) so bemessen ist, dass bei alleiniger Speisung des Lenkaktuators (4) durch Druckmittel aus dem vollen Speicher (7) ein mehrfaches Betätigen des Lenkaktuators (4) von Anschlag zu Anschlag möglich ist.
- Mobile Arbeitsmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein den Druck im Speicher (7) direkt oder indirekt erfassender Drucksensor (10) vorgesehen ist, der in Wirkverbindung mit einer Bremsanlage der Arbeitsmaschine steht, wobei bei Unterschreiten eines Druck-Grenzwertes ein zwangsgesteuerter Bremsvorgang auslösbar ist.
- Mobile Arbeitsmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Schwellendrehzahl des Verbrennungsmotors (1) im Bereich der mittleren Betriebsdrehzahlen liegt.
- Mobile Arbeitsmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Lenkpumpe (2) als Konstantpumpe ausgebildet ist, der eine förderdruckgesteuerte, zwischen zwei Schaltstellungen bewegliche Druckwaage (11) nachgeschaltet ist, wobei die Lenkpumpe (2) in der ersten Schaltstellung der Druckwaage (11) mit dem Lenkaktuator (4) und in der zweiten Schaltstellung mit einem Tank (T) verbunden ist.
- Mobile Arbeitsmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Lenkpumpe (2) als Verstellpumpe ausgebildet ist.
- Mobile Arbeitsmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass eine Arbeitshydraulik (13) mit vorgeschalteter Steuerventilanordnung (14) an die Lenkpumpe (2) und den Lenkzylinder (4) angeschlossen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001145992 DE10145992A1 (de) | 2001-09-18 | 2001-09-18 | Mobile Arbeitsmaschine mit einem Verbrennungsmotor und einer davon angetriebenen hydraulischen Lenkpumpe |
DE10145992 | 2001-09-18 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1293669A2 true EP1293669A2 (de) | 2003-03-19 |
EP1293669A3 EP1293669A3 (de) | 2005-04-13 |
EP1293669B1 EP1293669B1 (de) | 2007-04-11 |
Family
ID=7699435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20020019785 Expired - Lifetime EP1293669B1 (de) | 2001-09-18 | 2002-09-04 | Von einem Verbrennungsmotor angetriebene hydrauliche Lenkpumpe |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1293669B1 (de) |
DE (2) | DE10145992A1 (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102305222A (zh) * | 2011-08-24 | 2012-01-04 | 天津大学 | 带蓄能器缓冲作用的电液可变气门装置及其储能方法 |
EP2420626A1 (de) | 2010-08-19 | 2012-02-22 | Deere & Company | Hydraulische Anordnung |
CN102913412A (zh) * | 2012-10-08 | 2013-02-06 | 潍坊优力动力配套有限公司 | 液压水泵机组 |
CN105644620A (zh) * | 2016-04-05 | 2016-06-08 | 南京林业大学 | 一种节能型常压式液压助力转向系统 |
CN107246420A (zh) * | 2017-07-20 | 2017-10-13 | 南京讯联智能科技有限公司 | 一种自带堵塞发讯的先导集成阀组 |
CN109591886A (zh) * | 2018-11-30 | 2019-04-09 | 三汽车起重机械有限公司 | 车辆辅助转向系统及自动驾驶车辆 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010042098B4 (de) | 2010-10-07 | 2021-01-07 | Zf Friedrichshafen Ag | Verfahren zum Betreiben eines Antriebsstrangs |
CN105545135B (zh) * | 2015-02-28 | 2017-08-25 | 北京航空航天大学 | 基于定量马达原理的战机弹舱舱门瞬态作动系统 |
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 (de) * | 1991-05-31 | 1993-02-03 | Praxair Technology, Inc. | Flüssigkeitspumpanlage mit variabler Geschwindigkeit für Tankfahrzeuge |
DE19955312A1 (de) * | 1999-11-17 | 2001-06-13 | Jungheinrich Ag | Antriebssystem für Flurförderzeuge |
-
2001
- 2001-09-18 DE DE2001145992 patent/DE10145992A1/de not_active Withdrawn
-
2002
- 2002-09-04 EP EP20020019785 patent/EP1293669B1/de not_active Expired - Lifetime
- 2002-09-04 DE DE50209903T patent/DE50209903D1/de 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 (de) * | 1991-05-31 | 1993-02-03 | Praxair Technology, Inc. | Flüssigkeitspumpanlage mit variabler Geschwindigkeit für Tankfahrzeuge |
DE19955312A1 (de) * | 1999-11-17 | 2001-06-13 | Jungheinrich Ag | Antriebssystem für Flurförderzeuge |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2420626A1 (de) | 2010-08-19 | 2012-02-22 | Deere & Company | Hydraulische Anordnung |
DE102010039509A1 (de) | 2010-08-19 | 2012-02-23 | Deere & Company | Hydraulische Anordnung |
CN102305222A (zh) * | 2011-08-24 | 2012-01-04 | 天津大学 | 带蓄能器缓冲作用的电液可变气门装置及其储能方法 |
CN102305222B (zh) * | 2011-08-24 | 2014-03-26 | 天津大学 | 带蓄能器缓冲作用的电液可变气门装置及其储能方法 |
CN102913412A (zh) * | 2012-10-08 | 2013-02-06 | 潍坊优力动力配套有限公司 | 液压水泵机组 |
CN105644620A (zh) * | 2016-04-05 | 2016-06-08 | 南京林业大学 | 一种节能型常压式液压助力转向系统 |
CN107246420A (zh) * | 2017-07-20 | 2017-10-13 | 南京讯联智能科技有限公司 | 一种自带堵塞发讯的先导集成阀组 |
CN109591886A (zh) * | 2018-11-30 | 2019-04-09 | 三汽车起重机械有限公司 | 车辆辅助转向系统及自动驾驶车辆 |
Also Published As
Publication number | Publication date |
---|---|
DE10145992A1 (de) | 2003-04-03 |
EP1293669B1 (de) | 2007-04-11 |
DE50209903D1 (de) | 2007-05-24 |
EP1293669A3 (de) | 2005-04-13 |
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