EP1577257A2 - Appareil de levage hydraulique pour chariot élévateur électrique - Google Patents

Appareil de levage hydraulique pour chariot élévateur électrique Download PDF

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Publication number
EP1577257A2
EP1577257A2 EP05004255A EP05004255A EP1577257A2 EP 1577257 A2 EP1577257 A2 EP 1577257A2 EP 05004255 A EP05004255 A EP 05004255A EP 05004255 A EP05004255 A EP 05004255A EP 1577257 A2 EP1577257 A2 EP 1577257A2
Authority
EP
European Patent Office
Prior art keywords
lifting
hydraulic
hydraulic pump
valve
load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05004255A
Other languages
German (de)
English (en)
Other versions
EP1577257B1 (fr
EP1577257A3 (fr
Inventor
Nis-Georg Nissen
Thomas Stolten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jungheinrich AG
Original Assignee
Jungheinrich AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jungheinrich AG filed Critical Jungheinrich AG
Publication of EP1577257A2 publication Critical patent/EP1577257A2/fr
Publication of EP1577257A3 publication Critical patent/EP1577257A3/fr
Application granted granted Critical
Publication of EP1577257B1 publication Critical patent/EP1577257B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/163—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for sharing the pump output equally amongst users or groups of users, e.g. using anti-saturation, pressure compensation
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/165—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for adjusting the pump output or bypass in response to demand
    • 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
    • F15B2211/20507—Type of prime mover
    • F15B2211/20515—Electric motor
    • 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
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F15B2211/3053—In combination with a pressure compensating valve
    • F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line

Definitions

  • the invention relates to a hydraulic lifting device for battery-operated Forklift trucks according to the preamble of patent claim 1.
  • a hydraulic lifting device has become known in which at least one hydraulic lifting cylinder is acted upon by a pump in load lifting operation which is driven by an electric machine.
  • the pump works as a hydraulic motor and drives the electric machine as generator on (benefit sinks).
  • Senkzweig is a hydraulic flow restrictor arranged at which in certain operating points, the total hydraulic pressure falls off and which takes over the load attitude.
  • the Senkzweig is between a check valve and the input of the hydraulic pump connected. It is provided at least one secondary consumer, in the lowering operation of the lifting cylinder can be supplied with the medium of the lifting cylinder.
  • the electric machine is always operated in the same direction, and the other hydraulic consumer can be supplied directly with hydraulic energy from the sinking process, so that efficiency losses are minimized.
  • a speed control ensures a Load-independent control of the lowering speed both in regenerative mode Operation of the electric machine as well as in a control alone over a Valve assembly. Both the lifting and the lowering speed via a speed control of the electric machine. This can happen that the Lowering speed is undesirably high, if due to the high volume flow demand the additional consumer the speed of the electric Machine is increased accordingly.
  • a similar lifting device as that described is known from DE 100 10 870 C2 become.
  • a throttle valve and a pressure compensator are arranged, and a connection point between throttle valve and pressure compensator is with the input connected to the hydraulic pump, while the output of the pressure compensator to the tank is directed.
  • With the lifting device described is even with double operation, i.e. Energy recovery during the lowering process and supply of secondary consumers achieved a relatively good efficiency.
  • the invention is based on the object, a hydraulic lifting device for to create battery-operated trucks, with whatever the particular Volume flow requirements minimum flow losses can be achieved.
  • the lift valve in the lifting branch is downstream of the branch arranged the line to the secondary consumers.
  • the line is upstream of the Control valve connected via a pressure compensator with the tank.
  • the pressure compensator with the Pressure in the pressure line (in lifting mode) or pressure at the secondary consumer is driven in order to derive the excess unsolicited quantity (Load sensing).
  • an inlet pressure compensator is arranged upstream of the secondary consumer. Due to this design as a load-sensing system in conjunction with 2-way current controller (Inlet pressure compensator) for controlling the secondary consumer the possibility of several secondary functions simultaneously with pressure medium from the Supply load and their operating speed independently depending on the operation of the respective setpoint generator to regulate.
  • volumetric flow demand of one or more secondary consumers is greater than the volume flow rate available from the load lowering operation the speed control device that the speed of the electric machine is not around the theoretically resulting differential speed is increased.
  • the secondary consumers only as much volume flow is made available as from the Load lowering operation is available. This will cause an unwanted acceleration the lowering process avoided.
  • the sole figure shows a circuit diagram for a device according to the invention.
  • a hydraulic pump 5 can be seen, which with a electric machine 6 is coupled.
  • the electric machine is not powered by one
  • the speed control device shown in its speed controlled, the speed setpoint is specified via a speed setpoint generator, by an operator is operated in an industrial truck.
  • a Reach truck referred to, a lifting cylinder 1, a tilting cylinder 2, a side thrust cylinder 3 and a push cylinder 4 has.
  • the tilt cylinder the mast is tilted backwards or forwards, with the side thrust cylinder is the Load support laterally displaced, and with the push cylinder 4, the mast from Drive part continues on or on this moved forward, as is known.
  • the pump 5 provides the pressure medium for all consumers (main consumers Lifting cylinder 1 and secondary consumers 2 to 4) are available, wherein the pressure medium is sucked from a tank 19 via a check valve 17 in the tank line 7.
  • the individual valves with which the different consumers are controlled are housed in block 18.
  • a lift valve 7 and a check valve 20 are arranged in a pressure or lifting line 9 to the lifting cylinder 1.
  • the lifting speed is determined by the speed of the electric motor 6 and this in turn over the setpoint generator, not shown.
  • a Senkzweig 8 is between lifting cylinder 1 and connected to the check valve 20 in which a throttle valve 11 is arranged. The other end is connected to the tank line 7 between a check valve 17 and the Pump 5 connected.
  • a Branch line 10 connected to the pressure line 9. It serves to supply the mentioned auxiliary consumers.
  • two pressure compensators 15 to the Line 10 is connected, whose output is connected to a line 14, the each leads to a control valve 16.
  • the control valves 16 With the help of the control valves 16 is the Speed of the secondary consumers controlled. Tilting cylinder and side thrust cylinder are operated together via the control valve 16, via a another valve 22 whose position determines to which of the cylinders 2, 3 the Hydraulic medium flows.
  • a tank line 12 is connected, in which a pressure compensator 13 is arranged.
  • the hydraulic medium arrives Tank 19, wherein in the conduit 12, a filter 24 is arranged and parallel to this one Check valve 26.
  • a first shuttle valve 28 is at the ends in each case with the input of the control valves 16 connected.
  • the position of the valve ball depends on which pressure at the two Inputs the larger one is.
  • the shuttle valve is connected to the input of a second shuttle valve 30 connected to the other end with the pressure line 9 in Connection stands. Again, the position of the valve ball depends on which Pressure at the two inputs of the shuttle valve is the larger.
  • the middle of the second shuttle valve 30 is connected to a control input of the pressure compensator 13. In this way, a load-sensing system is created.
  • the operation of the arrangement shown is as follows. Working in lifting mode the hydraulic unit as a pump, and the lifting speed depends on the Specification by the operator via a setpoint generator. This will also the Opening width of the globe valve specified. Stepping during the lifting process Volume flow requirements of the secondary consumers, they are on the Branch line 10 also supplied with hydraulic medium, the amount by the control valves 16 is given, and the pressure compensators 15 ensure that this independent of load happens.
  • hydraulic medium passes through the throttle valve 11 Pump 5 and drives it, so that the electric machine 6 operate as a generator and can return power to the battery.
  • the hydraulic medium passes through the Branch 10 and the pressure compensator 13 to the tank 19, which happens almost lossless.
  • the globe valve 7 is naturally closed.
  • Occur volume flow requirements during the lowering process also in terms of Secondary consumers, these can also be supplied. Not needed Hydraulic medium is in turn returned via pressure compensator 13. Exceeds printing and volume flow from the load-lowering operation the pressure and volume flow demand one or more secondary consumers, so in addition to the supply of a or several secondary consumers in parallel generating regenerative excess Power from the load-lowering operation via pump and electric machine 6 possible. Secondary consumers can work independently in the load-lowering mode with pressure medium be supplied in response to the actuation of the control valves 16 or the associated setpoint generator to be controlled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP05004255A 2004-03-11 2005-02-26 Appareil de levage hydraulique pour chariot élévateur électrique Expired - Lifetime EP1577257B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011913 2004-03-11
DE102004011913A DE102004011913B4 (de) 2004-03-11 2004-03-11 Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge

Publications (3)

Publication Number Publication Date
EP1577257A2 true EP1577257A2 (fr) 2005-09-21
EP1577257A3 EP1577257A3 (fr) 2005-09-28
EP1577257B1 EP1577257B1 (fr) 2009-01-14

Family

ID=34833111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05004255A Expired - Lifetime EP1577257B1 (fr) 2004-03-11 2005-02-26 Appareil de levage hydraulique pour chariot élévateur électrique

Country Status (3)

Country Link
US (1) US7181910B2 (fr)
EP (1) EP1577257B1 (fr)
DE (2) DE102004011913B4 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014095240A1 (fr) * 2012-12-17 2014-06-26 Jungheinrich Aktiengesellschaft Dispositif de levage hydraulique pour chariot de manutention fonctionnant sur batterie
DE102017131164A1 (de) 2017-12-22 2019-06-27 Linde Material Handling Gmbh Hydraulisches Antriebssystem einer mobilen Arbeitsmaschine, insbesondere eines Flurförderzeugs

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007010697A1 (de) * 2007-03-06 2008-09-11 Jungheinrich Aktiengesellschaft Flurförderzeug
DE102007028864A1 (de) * 2007-03-27 2008-10-02 Robert Bosch Gmbh Hydraulische Steueranordnung
US7980073B2 (en) * 2008-05-08 2011-07-19 Caterpillar Inc. Hybrid system for a powertrain and hydraulic system
DE102012102092B4 (de) 2012-03-13 2024-04-25 Still Gesellschaft Mit Beschränkter Haftung Hydraulikanlage einer mobilen Arbeitsmaschine, insbesondere eines Flurförderzeugs
SE1350633A1 (sv) * 2013-05-24 2014-11-25 BAE Systems Hägglunds Aktiebolag Förfarande och system för styrning av hydraulanordning
US9975426B2 (en) 2013-06-26 2018-05-22 Parker-Hannifin Manufacturing Limited Energy efficient electric vehicle control system
DE102014108370B4 (de) * 2014-06-13 2020-10-01 Jungheinrich Aktiengesellschaft Hydraulische Hubvorrichtung für ein batteriebetriebenes Flurförderzeug
DE102014114526A1 (de) 2014-10-07 2016-04-07 Linde Material Handling Gmbh Hydraulisches Antriebssystem einer batterie-betriebenen mobilen Arbeitsmaschine
DE102016110312B4 (de) 2016-06-03 2025-06-26 Still Gesellschaft Mit Beschränkter Haftung Verfahren zum Betrieb eines hydraulisches Antriebssystems eines Flurförderzeugs
DE102016124506A1 (de) * 2016-12-15 2018-06-21 Jungheinrich Aktiengesellschaft Flurförderzeug mit einer Steuereinheit zur Regelung der Bewegung einer Last sowie ein entsprechendes Verfahren
US10947702B2 (en) * 2018-09-05 2021-03-16 Hitachi Construction Machinery Tierra Co., Ltd Hydraulic drive system for electrically driven hydraulic work machine
EP4711628A1 (fr) * 2024-09-13 2026-03-18 Palfinger AG Système d'entraînement pour véhicule de travail

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4127342C2 (de) * 1991-08-19 1995-02-16 Danfoss As Hydraulisches System mit einer Pumpe
DE4402653C2 (de) * 1994-01-29 1997-01-30 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
DE4423644C2 (de) * 1994-07-06 1998-10-01 Buchholz Hydraulik Hydraulische Steuervorrichtung
DE29911686U1 (de) * 1999-07-06 1999-09-16 Heilmeier & Weinlein Fabrik für Oel-Hydraulik GmbH & Co KG, 81673 München Elektrohydraulischer Hubmodul
DE10010670C2 (de) * 2000-03-04 2003-11-06 Jungheinrich Ag Hydraulische Hubvorrichtung für batteriebetriebene Flurförderzeuge
DE10224730B4 (de) * 2001-06-29 2012-09-27 Linde Material Handling Gmbh Hydraulische Steuereinrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014095240A1 (fr) * 2012-12-17 2014-06-26 Jungheinrich Aktiengesellschaft Dispositif de levage hydraulique pour chariot de manutention fonctionnant sur batterie
DE102017131164A1 (de) 2017-12-22 2019-06-27 Linde Material Handling Gmbh Hydraulisches Antriebssystem einer mobilen Arbeitsmaschine, insbesondere eines Flurförderzeugs

Also Published As

Publication number Publication date
EP1577257B1 (fr) 2009-01-14
DE102004011913B4 (de) 2005-12-29
EP1577257A3 (fr) 2005-09-28
US7181910B2 (en) 2007-02-27
US20050198950A1 (en) 2005-09-15
DE102004011913A1 (de) 2005-10-13
DE502005006449D1 (de) 2009-03-05

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