EP1188709A2 - Hubvorrichtung - Google Patents
Hubvorrichtung Download PDFInfo
- Publication number
- EP1188709A2 EP1188709A2 EP01121831A EP01121831A EP1188709A2 EP 1188709 A2 EP1188709 A2 EP 1188709A2 EP 01121831 A EP01121831 A EP 01121831A EP 01121831 A EP01121831 A EP 01121831A EP 1188709 A2 EP1188709 A2 EP 1188709A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- line
- hydraulic
- lifting
- lifting device
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
Definitions
- the invention relates to a hydraulic lifting device for a battery-electric operated industrial truck, the lifting device being a vertically movable Load carrying means having at least one hydraulic lifting cylinder in There is an active connection with one in the lifting mode as a pump and in the lowering mode as a motor working hydraulic unit is connected, which with an in Lifting operation as a motor and lowering operation as a generator working electrical
- the machine is in a driving connection.
- Such a lifting device is known from EP 0 630 853 B1.
- the regulation of Lowering speed of the load handler in lowering mode and Lifting speed of the load handler in lifting operation is carried out by means of a Speed control of the electrical machine.
- the signal becomes a Setpoint generator formed a speed setpoint for the electrical machine.
- the speed setpoint is set by means of a on the electrical machine arranged speed sensor measured speed actual value compared, the off the actual speed value and the speed setpoint to a control deviation Speed controller of the electrical machine is given.
- a generic lifting device in which a control valve for controlling the lifting operation and lowering operation is provided.
- the lift cylinder In lowering mode, the lift cylinder is dependent on the by means of a changeover valve Consumer pressure via a lowering brake to a container or Energy recovery can be connected to the hydraulic unit.
- the speed of the Hydraulic unit in the sink mode with generator operation of the hydraulic unit is regulated in such a way that the pressure difference occurring at the control valve is kept at a constant value.
- the control valve for controlling the lifting and lowering movement is high Construction effort.
- the measurement of the pressure difference on Control valve and the arrangement of a lowering brake a high construction cost for the Control of the lowering movement at high lowering speeds and in Fine control range.
- the present invention has for its object a lifting device to provide the type mentioned at the outset, which requires little construction a control of the lifting and lowering mode and in the lowering mode has effective energy recovery.
- a valve for Lifting a load on the lifting cylinder is arranged, of which Pressure medium line between the lifting valve and the lifting cylinder Branch branches in which a valve for lowering the pending on the lifting cylinder Load is arranged, with a lowering in the branch line downstream of the valve Switch valve is arranged depending on the on the lifting cylinder pending consumer pressure in a the branch line with a container connecting switching position or the branch line with the hydraulic unit connecting switching position is acted upon.
- the invention for controlling the lifting movement is a valve in the hydraulic unit to the lifting cylinder leading pressure medium line.
- the lowering movement can be controlled by means of a further valve which is located in one of the Branch line branching pressure medium line is arranged, whereby by means of Changeover valve the pressure medium flowing out of the lifting cylinder to hydraulic unit can be returned if a corresponding There is consumer pressure on the lifting cylinder.
- This will be an effective one Enables energy recovery with the corresponding potential energy available.
- the changeover valve is in the switching position connecting the branch line to the hydraulic unit actable when the consumer pressure exceeds a predetermined value. Energy is thus recovered from a corresponding one Consumer pressure, which enables effective energy recovery. With a lowering process with low load or without load, there is no Energy recovery, since in such an operating state hardly any Energy recovery is possible. In such an operating state, the Valve in the branch line allows easy control of the sink movement.
- the changeover valve can be acted upon by the consumer pressure, for example.
- a pressure measuring device in particular a pressure switch, is provided for detection of the consumer pressure, which with the changeover valve in Active connection is established.
- a pressure measuring device can be easily a corresponding consumer pressure on the lifting cylinder in a Position to be applied to energy recovery.
- the valve arranged in the pressure medium line is for lifting as a throttling valve in intermediate positions with a blocking position and a flow position. With such a proportional valve can little effort for the valve to control the lifting movement.
- valve arranged in the branch line for lowering as a throttling valve in intermediate positions with one as a seat valve trained blocking position and a flow position is formed.
- a such a proportional valve results for the control of the lowering movement low valve effort.
- the seat valve function in the locked position can in lifting operation, an outflow of pressure medium via the branch line to simple Way to be avoided.
- one of the hydraulic fluid line is expedient Provided unit to a container-led circulation line in which a Pressure compensator is arranged, which is the pressure medium line with the container connecting switching position and a branch line with the pressure medium line connecting switching position.
- a Pressure compensator is arranged in which the control of several consumers of the Pump too much flow of pressure medium can flow to the tank corresponding connection of the branch line a connection of the Changeover valve with the pressure medium line and thus the hydraulic unit be achieved.
- the pressure compensator is expediently of that in the branch line Pressure in the switching position connecting the branch line with the pressure medium line is acted upon. This allows in a simple manner with appropriate pressure in the branch line connects the branch line to the hydraulic one Unit-related pressure medium line are manufactured.
- the hydraulic Unit can be operated in one direction of rotation, there are special advantages if the changeover valve to one led from a container to the hydraulic unit Line is connected, being in the line between the container and the Connection of the branch line opening towards the hydraulic unit Check valve is arranged.
- This can be operated in one direction of rotation hydraulic unit can be used, taking a check valve Outflow of pressure medium flowing out of the lifting cylinder to the container is avoided.
- a load holding valve is expedient in the pressure medium line between the connection of the Branch line and the lifting cylinder arranged a load holding valve.
- the load holding valve is in a position to lower one on the lifting cylinder current load can be opened in an open position, can be in lowering mode a connection of the lifting cylinder with the valve for lowering at low Circuit effort can be produced.
- a drain line is connected to the Branch line between the lowering valve and the changeover valve is connected, wherein a check valve is arranged in the drain line.
- the speed is Electrical machine detecting speed measuring device provided.
- a die Speed of the electrical machine detecting speed measuring device can simple way a feedback signal to control the lifting or Lowering speed of the load can be determined. In lifting operation, this can be done by a control of the valve for lifting depending on one Setpoint specification device and the feedback signal the predetermined Lifting speed can be set easily.
- the lower gear with Energy recovery can be used to lower the valve when the valve is fully open electrical machine depending on the setpoint input device and Feedback signal the electrical machine in a simple manner with such Operating speed that the set on the setpoint Sink speed is achieved.
- the electrical machine can be designed as a DC machine. Special Advantages arise when the electrical machine as an asynchronous machine is trained. With an asynchronous machine there is one in the sink mode automatic feeding of electrical energy back into the battery, resulting in a low construction costs for the lifting device results.
- FIG 1 is a hydraulic drive system 1 of a battery-electric operated industrial truck shown with a lifting device 3 according to the invention.
- the drive system includes a tilting device 2 and a device 4 for actuating an additional consumer, for example one Side shift.
- the hydraulic drive system 1 has a hydraulic unit 5a, which with an electrical designed as a DC machine or asynchronous machine Machine 6 is in a driving connection.
- the electrical machine 6 is available Supply of electrical energy with a battery no longer shown in Connection.
- the hydraulic unit 5a can be operated in two directions of rotation is connected to a container 8 by means of a line 7.
- the hydraulic Unit 5a is connected to a delivery line 10, which has one of two Control valves existing control valve device 11 for controlling the Tilt device 2 and one consisting of two control valves Control valve device 12 for controlling the device 4 is connected.
- the On the output side, control valve devices 11, 12 are connected to a container 8 guided container line 13 connected.
- a priority valve 14 is arranged with a pressure medium line 15 for the primary supply of a no longer hydraulic steering device shown serves.
- the lifting device 3 has at least one hydraulic lifting cylinder 20, which with a load suspension device, no longer shown, for lifting and lowering a load in Active connection is established.
- the lifting cylinder 20 is connected to the by means of a pressure medium line 21 Delivery line 10 of the hydraulic unit 5a connected.
- Delivery line 10 is a valve 22 for lifting a load on the lifting cylinder 20 arranged.
- a branch line 23 in which a valve 24 for Lowering a load on the lifting cylinder 20 is arranged.
- a switch valve 25 Downstream of the Valve 24 is a switch valve 25 is arranged in the branch line 23, which in a first switch position 25a connects the branch line 23 to the container line 13.
- a second switching position 25b of the valve 25 is the branch line 23 with the Delivery line 10 of the hydraulic unit 5a in connection.
- This is the Changeover valve 25 on the output side to a line 45 and a line 46 connectable, the line 45 leading to the delivery line 10 and the line 46 is connected to the container line 13.
- the switching valve 25 is in the switching position 25a and in by means of a spring 26 Dependence on the consumer pressure at the lifting cylinder 20 in the Switch position 25b can be acted upon.
- the switching valve 25 is electrical controllable changeover valve and formed in the pressure medium line 21 Pressure measuring device 30, for example a pressure switch, arranged with a for example, as a switching magnet actuating device 27 des Reversing valve is operatively connected to the changeover valve 25 in the direction of Switch position 25b acted upon.
- a load holding valve 31 In the pressure medium line 21 is between the connection of the branch line 23 and the Lift cylinder 20 also arranged a load holding valve 31.
- the valve 22 for lifting is a two-position valve throttling in intermediate positions formed with a blocking position 22a and a flow position 22b. In the direction the position 22a, the valve 22 is acted upon by a spring 35. Towards the The flow position is the valve 22 by means of an electro-hydraulic Actuating means 36 can be acted upon.
- the valve 24 for lowering is as in Intermediate positions throttling two-position valve is formed and has a Seat valve formed blocking position 24a and a flow position 24b.
- the Valve 24 is acted upon by a spring 37 in the direction of the blocking position 24a.
- an electro-hydraulic Actuating means 38 are provided. When the actuating means 38 of the Valve 24, the load holding valve 31 can be opened in an open position.
- a pressure compensator 41 On the delivery line 10 is in front of the priority valve 14 of the steering device Circulation line 40 connected, in which a pressure compensator 41 is arranged.
- the Pressure compensator 41 connects the delivery line 10 in the switching position shown the container. In the position of the pressure compensator 41 shown at the top in FIG. 1 is connected to the delivery line 10 circulation line 40 with the to Switch valve 25 guided line 45 in connection.
- the pressure compensator 41 is in this case of the pressure in the delivery line 10 the switch position shown can be acted upon. In those shown in the figure above Switch position is the pressure compensator 41 from the highest load pressure of the consumer Tilting device 2, the lifting device 3, the device 4 or the steering device acted upon. In the direction of the position shown in the figure above Pressure compensator 41 continues from the downstream of the changeover valve 25 in line 45 pressure can be applied. For this purpose, branches from that of the changeover valve 25 to the valve 41 line 45 leads from a control pressure line 47 to a Control pressure surface of the pressure compensator 41 is guided, which the pressure compensator 41 in the direction the switching position shown in the figure above.
- a drain line 50 connected to the branch line 23 between the Valve 24 and the switching valve 25 is guided, wherein in the drain line 50 check valve 51 which is normally in the blocking position is arranged.
- FIG. 2 shows a drive system 1 for a battery-operated one Industrial truck with a second embodiment of an inventive Lifting device 3.
- this is hydraulic unit 5b operable in one direction of rotation.
- the switch valve 25 connected line 45 is connected to line 7, in which Line 7 between the connection of line 45 and the container 8 in the direction to the hydraulic unit 5b opening check valve 52 is arranged.
- the Circulation line 40 is in this case guided from the delivery line 10 to the container 8, the Pressure compensator 41 from the highest load pressure of the consumers in the direction of one Locked position can be acted upon.
- the valve 22 for lifting and the valve 24 for lowering in the Blocking position In the illustrated neutral position of the lifting device 3 according to FIG. 1 or FIG. 2 is the valve 22 for lifting and the valve 24 for lowering in the Blocking position.
- the load holding valve 31 is the most by the consumer pressure Lift cylinder 20 applied load in the locked position, whereby the Consumer 20 is locked and the load complies with the set lifting height.
- the pressure compensator 41 is hereby by the delivery pressure of the hydraulic unit 5a, 5b working as a pump or the load pressure of the lifting cylinder 20 in that shown in Figures 1 and 2 above Switched position in which the connection of the delivery line 10 to the container 8th Is blocked.
- the pressure measuring device 30 does not provide a signal, as a result of which Reversing valve 25 remains in the position shown and the pressure medium over the Line 46 flows to container 8.
- the lifting device 3 therefore, only a small potential energy is available Energy recovery instead.
- the lowering speed is determined by the Lowering valve 24 is set, which controls the lowering movement in a simple manner can be.
- the branch line 23 is also present the line 45 in connection. Due to the upcoming consumer pressure in the Control pressure line 47, the pressure compensator 41 in the direction in the figure above shown switching position, in which the line 45 with the delivery line 10 communicates. Pressure medium flowing out of the lifting cylinder 20 flows thus via the branch line 23, the changeover valve 25, the line 45 to the delivery line 10, whereby the hydraulic unit 5a is driven and works as a motor and which drives the electrical machine 6 operating as a generator. The electrical Machine 6 generates a braking torque to hold the load on the lifting cylinder 20 current load and feeds electrical energy back into the battery.
- the electrical Machine 6 of the lifting device of FIG. 1 has in lifting operation and Lower operation in a different direction of rotation.
- the flowing out from the hydraulic unit 5b working as a motor Pressure medium flows here via the bypass line 40 and in the flow position located pressure compensator 41 to the container 8.
- the hydraulic unit 5b according to the Figure 2 thus has the same direction of rotation in lifting and lowering.
- valve 24 When the pressure measuring device 30 responds, the valve 24 can move completely into the Flow position 24b are opened, resulting in low losses and the potential energy of the load with little loss as electrical energy can be recovered.
- the speed measuring device on the Electrical machine 6 determined speed can be in the sink mode Energy recovery a feedback signal to control the speed of the electrical machine 6 can be determined to the load with the Setpoint value setting device to lower the predetermined lowering speed.
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
Description
- Figur 1
- eine erste Ausführungsform einer erfindungsgemäßen Hubvorrichtung und
- Figur 2
- eine zweite Ausführungsförm einer erfindungsgemäßen Hubvorrichtung.
Claims (15)
- Hydraulische Hubvorrichtung für ein batterie-elektrisch betriebenes Flurförderzeug, wobei die Hubvorrichtung ein vertikal bewegbares Lastaufnahmemittel aufweist, das mit zumindest einem hydraulischen Hubzylinder in Wirkverbindung steht, der mit einem im Hebebetrieb als Pumpe und im Senkenbetrieb als Motor arbeitenden hydraulischen Aggregat in Verbindung steht, das mit einer im Hebenbetrieb als Motor und im Senkenbetrieb als Generator arbeitenden elektrischen Maschine in trieblicher Verbindung steht, dadurch gekennzeichnet, dass in einer von dem hydraulischen Aggregat (5a; 5b) zum Hubzylinder (20) geführten Druckmittelleitung (21) ein Ventil (22) zum Heben einer am Hubzylinder (20) anstehenden Last angeordnet ist, wobei von der Druckmittelleitung (21) zwischen dem Ventil (22) zum Heben und dem Hubzylinder (20) eine Zweigleitung (23) abzweigt, in der ein Ventil (24) zum Senken der am Hubzylinder (20) anstehenden Last angeordnet ist, wobei in der Zweigleitung (23) stromab des Ventils (24) zum Senken ein Umschaltventil (25) angeordnet ist, das in Abhängigkeit von dem am Hubzylinder (20) anstehenden Verbraucherdruck in eine die Zweigleitung (23) mit einem Behälter (8) verbindende Schaltstellung (25a) oder die Zweigleitung (23) mit dem hydraulischen Aggregat (5a; 5b) verbindende Schaltstellung (25b) beaufschlagbar ist.
- Hydraulische Hubvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Umschaltventil (25) in die die Zweigleitung (23) mit dem hydraulischen Aggregat (5a; 5b) verbindende Schaltstellung (25b) beaufschlagbar ist, wenn der Verbraucherdruck einen vorbestimmten Wert überschreitet.
- Hydraulische Hubvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass eine Druckmesseinrichtung (30), insbesondere ein Druckschalter, zur Erfassung des Verbraucherdrucks vorgesehen ist, die mit dem Umschaltventil (25) in Wirkverbindung steht.
- Hydraulische Hubvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das in der Druckmittelleitung (21) angeordnete Ventil (22) zum Heben als in Zwischenstellungen drosselndes Ventil mit einer Sperrstellung (22a) und einer Durchflussstellung (22b) ausgebildet ist.
- Hydraulische Hubvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das in der Zweigleitung (23) angeordnete Ventil (24) zum Senken als in Zwischenstellungen drosselndes Ventil mit einer als Sitzventil ausgebildeten Sperrstellung (24a) und einer Durchflussstellung (24b) ausgebildet ist.
- Hydraulische Hubvorrichtung nach einem der Ansprüche 1 bis 5, wobei das hydraulische Aggregat (5a) in zwei Drehrichtungen betreibbar ist, dadurch gekennzeichnet, dass das Umschaltventil (25) mit der Druckmittelleitung (21) zwischen dem hydraulischen Aggregat (5a) und dem Ventil (22) zum Heben in Verbindung steht.
- Hydraulische Hubvorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass eine von der Druckmittelleitung (21) des hydraulischen Aggregats (5a) zu einem Behälter (8) geführte Umlaufleitung (40) vorgesehen ist, in der eine Druckwaage (41) angeordnet ist, die eine die Druckmittelleitung (21) mit dem Behälter (8) verbindende Schaltstellung und eine die Zweigleitung (23) mit der Druckmittelleitung (21) verbindende Schaltstellung aufweist.
- Hydraulische Hubvorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Druckwaage (41) von dem in der Zweigleitung (23) anstehenden Druck in die die Zweigleitung (23) mit der Druckmittelleitung (21) verbindende Schaltstellung beaufschlagbar ist.
- Hydraulische Hubvorrichtung nach einem der Ansprüche 1 bis 5, wobei das hydraulische Aggregat (5b) in einer Drehrichtung betreibbar ist, dadurch gekennzeichnet, dass das Umschaltventil (25) an eine von einem Behälter (8) zum hydraulischen Aggregat (5b) geführte Leitung (7) angeschlossen ist, wobei in der Leitung (7) zwischen dem Behälter (8) und dem Anschluss der Zweigleitung (23) ein in Richtung zum hydraulischen Aggregat (5b) öffnendes Sperrventil (52) angeordnet ist.
- Hydraulische Hubvorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass in der Druckmittelleitung (21) zwischen dem Anschluss der Zweigleitung (23) und dem Hubzylinder (20) ein Lasthalteventil (31) angeordnet ist.
- Hydraulische Hubvorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass das Lasthalteventil (31) in einer Stellung zum Senken einer am Hubzylinder (20) anstehenden Last in eine Öffnungsstellung aufsteuerbar ist.
- Hydraulische Hubvorrichtung nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass zwischen dem Lasthalteventil (31) und dem Hubzylinder (20) eine Ablassleitung (50) angeschlossen ist, die an die Zweigleitung (23) zwischen dem Ventil (24) zum Senken und dem Umschaltventil (25) angeschlossen ist, wobei in der Ablassleitung ein Sperrventil (51) angeordnet ist.
- Hydraulische Hubvorrichtung nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass eine die Drehzahl der elektrischen Maschine (6) erfassende Drehzahlmesseinrichtung vorgesehen ist.
- Hydraulische Hubvorrichtung nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die elektrische Maschine (6) als Gleichstrommaschine ausgebildet ist.
- Hydraulische Hubvorrichtung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die elektrische Maschine (6) als Asynchronmaschine ausgebildet ist.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10045998 | 2000-09-18 | ||
DE10045998 | 2000-09-18 | ||
DE10049829 | 2000-10-09 | ||
DE10049829A DE10049829A1 (de) | 2000-09-18 | 2000-10-09 | Hubvorrichtung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1188709A2 true EP1188709A2 (de) | 2002-03-20 |
EP1188709A3 EP1188709A3 (de) | 2005-04-13 |
EP1188709B1 EP1188709B1 (de) | 2006-11-02 |
Family
ID=26007087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010121831 Expired - Lifetime EP1188709B1 (de) | 2000-09-18 | 2001-09-11 | Hubvorrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1188709B1 (de) |
DE (1) | DE50111349D1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102808783A (zh) * | 2012-01-18 | 2012-12-05 | 侯学青 | 机电一体化光伏直流大功率潜水泵 |
EP2660184A1 (de) * | 2010-12-28 | 2013-11-06 | Sunward Intelligent Equipment Co., Ltd. | Stromerzeugungssystem mit energierückgewinnung für fahrzeuge zum laden, entladen und transportieren |
DE102014108370A1 (de) * | 2014-06-13 | 2015-12-17 | Jungheinrich Aktiengesellschaft | Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug |
DE102011056069B4 (de) | 2011-12-06 | 2022-08-04 | Still Gesellschaft Mit Beschränkter Haftung | Verfahren zum Betrieb eines Hydrauliksystems einer mobilen Arbeitsmaschine |
DE102011056068B4 (de) | 2011-12-06 | 2022-08-11 | Still Gesellschaft Mit Beschränkter Haftung | Hydrauliksystem einer mobilen Arbeitsmaschine |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0630853A1 (de) * | 1993-05-28 | 1994-12-28 | Jungheinrich Aktiengesellschaft | Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen |
DE4416173A1 (de) * | 1994-05-06 | 1995-11-09 | Jungheinrich Ag | Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge oder dergleichen |
EP1052215A2 (de) * | 1999-05-10 | 2000-11-15 | Dambach Lagersysteme GmbH | Hydraulische Hubvorrichtung |
-
2001
- 2001-09-11 EP EP20010121831 patent/EP1188709B1/de not_active Expired - Lifetime
- 2001-09-11 DE DE50111349T patent/DE50111349D1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0630853A1 (de) * | 1993-05-28 | 1994-12-28 | Jungheinrich Aktiengesellschaft | Hydraulische Hubvorrichtung für batteriegetriebene Flurförderzeuge oder dergleichen |
DE4416173A1 (de) * | 1994-05-06 | 1995-11-09 | Jungheinrich Ag | Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge oder dergleichen |
EP1052215A2 (de) * | 1999-05-10 | 2000-11-15 | Dambach Lagersysteme GmbH | Hydraulische Hubvorrichtung |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2660184A1 (de) * | 2010-12-28 | 2013-11-06 | Sunward Intelligent Equipment Co., Ltd. | Stromerzeugungssystem mit energierückgewinnung für fahrzeuge zum laden, entladen und transportieren |
EP2660184A4 (de) * | 2010-12-28 | 2014-09-17 | Sunward Intelligent Equipment | Stromerzeugungssystem mit energierückgewinnung für fahrzeuge zum laden, entladen und transportieren |
US9422949B2 (en) | 2010-12-28 | 2016-08-23 | Sunward Intelligent Equipment Co., Ltd. | Energy-recovery generation system for handling and carrying electric vehicle |
DE102011056069B4 (de) | 2011-12-06 | 2022-08-04 | Still Gesellschaft Mit Beschränkter Haftung | Verfahren zum Betrieb eines Hydrauliksystems einer mobilen Arbeitsmaschine |
DE102011056068B4 (de) | 2011-12-06 | 2022-08-11 | Still Gesellschaft Mit Beschränkter Haftung | Hydrauliksystem einer mobilen Arbeitsmaschine |
CN102808783A (zh) * | 2012-01-18 | 2012-12-05 | 侯学青 | 机电一体化光伏直流大功率潜水泵 |
DE102014108370A1 (de) * | 2014-06-13 | 2015-12-17 | Jungheinrich Aktiengesellschaft | Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug |
DE102014108370B4 (de) * | 2014-06-13 | 2020-10-01 | Jungheinrich Aktiengesellschaft | Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug |
Also Published As
Publication number | Publication date |
---|---|
EP1188709A3 (de) | 2005-04-13 |
EP1188709B1 (de) | 2006-11-02 |
DE50111349D1 (de) | 2006-12-14 |
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