EP1628020A3 - Fluid circuit and industrial truck with fluid circuit - Google Patents

Fluid circuit and industrial truck with fluid circuit Download PDF

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Publication number
EP1628020A3
EP1628020A3 EP05017883A EP05017883A EP1628020A3 EP 1628020 A3 EP1628020 A3 EP 1628020A3 EP 05017883 A EP05017883 A EP 05017883A EP 05017883 A EP05017883 A EP 05017883A EP 1628020 A3 EP1628020 A3 EP 1628020A3
Authority
EP
European Patent Office
Prior art keywords
fluid
reservoir
fluid circuit
return
fluid reservoir
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.)
Withdrawn
Application number
EP05017883A
Other languages
German (de)
French (fr)
Other versions
EP1628020A2 (en
Inventor
Konrad Dipl.-Ing. Stingl
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 EP1628020A2 publication Critical patent/EP1628020A2/en
Publication of EP1628020A3 publication Critical patent/EP1628020A3/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
    • F15B11/0445—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out" with counterbalance valves, e.g. to prevent overrunning or for braking
    • 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/40—Flow control
    • F15B2211/455—Control of flow in the feed line, i.e. meter-in control
    • 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
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • 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
    • F15B2211/40—Flow control
    • F15B2211/47—Flow control in one direction only
    • F15B2211/473—Flow control in one direction only without restriction in the reverse direction
    • 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
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7052—Single-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Die Erfindung betrifft eine Fluidschaltung, insbesondere Hydraulikschaltung für eine Lastverlagerungseinrichtung eines Flurförderzeugs, mit einer Fluidzufuhrleitung (118a, 118b, 118c), durch welche ein Fluid aus einem Fluidvorrat (112) mittels einer Fluidpumpe (116) zu wenigstens einem Fluidspeicher (120) eines Verbrauchers (122) förderbar ist, und mit einer Fluidrückführleitung (118c, 148, 118a), durch welche Fluid verbrauchergetrieben von dem wenigstens einen Fluidspeicher (120) über die Fluidpumpe (116) zu dem Fluidvorrat (112) rückführbar ist, wobei in der Fluidzufuhrleitung (118a, 118b, 118c) ein strömungsrichtungsabhängig Fluid durchlassendes Ventil (130)vorgesehen ist, welches eine Fluid-Zufuhrströmung (Z) vom Fluidvorrat (112) zum Fluidspeicher durchlässt und welches eine Fluid-Rückführströmung (R) vom Fluidspeicher (120) zum Fluidvorrat (112) sperrt, wobei die Fluidschaltung weiterhin wenigstens ein schaltbares Ventil (132, 134) umfasst, welches schaltbar ist zwischen einer Rückführströmungs-Durchlassstellung (140, 144'), in welcher es eine Fluid-Rückführströmung (R) durchlässt, und einer Rückführströmungs-Sperrstellung, (142, 146) in welcher es eine Fluid-Rückführströmung (R) sperrt, und zeichnet sich dadurch aus, dass die Fluidrückführleitung (118c, 148, 118a) zumindest abschnittsweise von der Fluidzufuhrleitung (118a, 118b, 118c) gesondert ausgebildet ist, wobei das schaltbare Ventil (132, 134) in dem von der Fluidzufuhrleitung (118b) gesonderten Abschnitt (148) der Fluidrückführleitung (118c, 148, 118a) vorgesehen ist.

Figure imgaf001
The invention relates to a fluid circuit, in particular a hydraulic circuit for a load transfer device of a truck, with a fluid supply line (118a, 118b, 118c), through which a fluid from a fluid reservoir (112) by means of a fluid pump (116) to at least one fluid reservoir (120) of a consumer (122) and with a fluid return line (118c, 148, 118a) through which fluid consumer driven from the at least one fluid reservoir (120) via the fluid pump (116) to the fluid reservoir (112) is traceable, wherein in the fluid supply line ( 118a, 118b, 118c) there is provided a flow direction dependent fluid passing valve (130) which passes a fluid supply flow (Z) from the fluid reservoir (112) to the fluid reservoir and which provides a fluid return flow (R) from the fluid reservoir (120) to the fluid reservoir ( 112) blocks, wherein the fluid circuit further comprises at least one switchable valve (132, 134) which is switchable zw A return flow passage position (140, 144 ') in which it passes a fluid return flow (R) and a return flow blocking position (142, 146) in which it blocks a fluid return flow (R) is characterized in that the fluid return line (118c, 148, 118a) is formed at least in sections from the fluid supply line (118a, 118b, 118c), wherein the switchable valve (132, 134) in the separate from the fluid supply line (118b) portion (148 ) of the fluid return line (118c, 148, 118a) is provided.
Figure imgaf001
EP05017883A 2004-08-17 2005-08-17 Fluid circuit and industrial truck with fluid circuit Withdrawn EP1628020A3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004039848A DE102004039848A1 (en) 2004-08-17 2004-08-17 Fluid circuit and truck with fluid circuit

Publications (2)

Publication Number Publication Date
EP1628020A2 EP1628020A2 (en) 2006-02-22
EP1628020A3 true EP1628020A3 (en) 2008-09-03

Family

ID=35148963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05017883A Withdrawn EP1628020A3 (en) 2004-08-17 2005-08-17 Fluid circuit and industrial truck with fluid circuit

Country Status (3)

Country Link
US (1) US7441406B2 (en)
EP (1) EP1628020A3 (en)
DE (1) DE102004039848A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006060351B8 (en) * 2006-12-20 2008-07-24 Sauer-Danfoss Gmbh & Co Ohg Hydraulic circuit with energy recovery
DE102007017472B4 (en) * 2007-04-13 2018-05-30 Franz Xaver Meiller Fahrzeug- Und Maschinenfabrik - Gmbh & Co Kg Relief of a hydraulic tilting system
DE102009016431A1 (en) * 2009-04-04 2010-10-07 Mahle International Gmbh Hydraulic lifting device and forklift
SE535284C2 (en) * 2010-01-25 2012-06-12 Bt Products Ab Method for cleaning hydraulic fluid, computer program product, control unit and industrial truck
DE102011119788A1 (en) * 2011-11-30 2013-06-06 Robert Bosch Gmbh Hydraulic drive system has valve assembly for controlling respective fluid flow, which is provided with primary and secondary valve sub-assembly to perform same switching function, in which valve sub-assemblies are connected in series
EP2835540B1 (en) * 2013-08-08 2016-04-27 HAWE Hydraulik SE Hydraulic drive
IT201700115476A1 (en) * 2017-10-13 2019-04-13 Gervasi Ecologica Srl Tipping trailer equipped with a safety device, vehicle comprising this device and relative method of updating a trailer.
DE102018112835A1 (en) * 2018-05-29 2019-12-05 Fsp Fluid Systems Partner Holding Ag Hydraulic system, hydraulic unit, vehicle, procedures and use

Citations (6)

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JPH09210002A (en) * 1996-01-31 1997-08-12 Shimadzu Corp Hydraulic unit and lifter therewith
JPH10141307A (en) * 1996-11-06 1998-05-26 Shimadzu Corp Fluid pressure unit
JPH10159812A (en) * 1996-11-29 1998-06-16 Shimadzu Corp Hydraulic unit
EP1188934A2 (en) * 2000-09-13 2002-03-20 Robert Bosch Gmbh Control device for an hydraulic volume flow
JP2002089501A (en) * 2000-09-13 2002-03-27 Shimadzu Corp Hydraulic device
JP2003049781A (en) * 2001-08-03 2003-02-21 Shimadzu Corp Hydraulic device

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DE4106845A1 (en) * 1991-03-04 1992-09-24 Deere & Co HYDRAULIC SYSTEM FOR CONTROLLING A POWER MOVING A CONSUMER
DE4416173C2 (en) * 1994-05-06 1996-05-30 Jungheinrich Ag Hydraulic lifting device for battery-operated industrial trucks or the like
DE4423644C2 (en) * 1994-07-06 1998-10-01 Buchholz Hydraulik Hydraulic control device
DE29617922U1 (en) * 1996-10-15 1996-11-28 Heilmeier & Weinlein Solenoid operated drain valve of an electro-hydraulic lifting module
US6305264B1 (en) * 1998-11-05 2001-10-23 Smc Kabushiki Kaisha Actuator control circuit
DE19921629B4 (en) * 1999-05-10 2005-05-25 Dambach Lagersysteme Gmbh Hydraulic lifting device
DE20208577U1 (en) * 2002-06-03 2003-12-11 Hawe Hydraulik Gmbh & Co. Kg Electro-hydraulic lift control device for industrial trucks

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09210002A (en) * 1996-01-31 1997-08-12 Shimadzu Corp Hydraulic unit and lifter therewith
JPH10141307A (en) * 1996-11-06 1998-05-26 Shimadzu Corp Fluid pressure unit
JPH10159812A (en) * 1996-11-29 1998-06-16 Shimadzu Corp Hydraulic unit
EP1188934A2 (en) * 2000-09-13 2002-03-20 Robert Bosch Gmbh Control device for an hydraulic volume flow
JP2002089501A (en) * 2000-09-13 2002-03-27 Shimadzu Corp Hydraulic device
JP2003049781A (en) * 2001-08-03 2003-02-21 Shimadzu Corp Hydraulic device

Non-Patent Citations (1)

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Title
REINHARDT H: "BYPASSVENTIL IN HYDROFILTERN", O + P OLHYDRAULIK UND PNEUMATIK, VEREINIGTE FACHVERLAGE, MAINZ, DE, vol. 19, no. 5, 1 January 1975 (1975-01-01), pages 409 - 412, XP002007021, ISSN: 0341-2660 *

Also Published As

Publication number Publication date
US7441406B2 (en) 2008-10-28
US20060037470A1 (en) 2006-02-23
EP1628020A2 (en) 2006-02-22
DE102004039848A1 (en) 2006-03-09

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