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

Fluid circuit and industrial truck with fluid circuit Download PDF

Info

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
flow
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Withdrawn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
Priority to DE200410039848 priority Critical patent/DE102004039848A1/en
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Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04Special measures taken in connection with the properties of the fluid
    • F15B21/041Removal or measurement of solid or liquid contamination, e.g. filtering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, 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
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices 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
    • B66F9/075Constructional features or details
    • B66F9/20Means for actuating or controlling masts, platforms, or forks
    • B66F9/22Hydraulic devices or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/044Systems 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"
    • F15B11/0445Systems 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20538Type of pump constant capacity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/30Directional control
    • F15B2211/305Directional control characterised by the type of valves
    • F15B2211/30505Non-return valves, i.e. check valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/405Flow control characterised by the type of flow control means or valve
    • F15B2211/40515Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/42Flow control characterised by the type of actuation
    • F15B2211/426Flow control characterised by the type of actuation electrically or electronically
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/455Control of flow in the feed line, i.e. meter-in control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/46Control of flow in the return line, i.e. meter-out control
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/40Flow control
    • F15B2211/47Flow control in one direction only
    • F15B2211/473Flow control in one direction only without restriction in the reverse direction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/50Pressure control
    • F15B2211/505Pressure control characterised by the type of pressure control means
    • F15B2211/50509Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518Pressure 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/615Filtering means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/60Circuit components or control therefor
    • F15B2211/63Electronic controllers
    • F15B2211/6303Electronic controllers using input signals
    • F15B2211/6306Electronic controllers using input signals representing a pressure
    • F15B2211/6313Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051Linear output members
    • F15B2211/7052Single-acting output members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/70Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Abstract

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.
EP05017883A 2004-08-17 2005-08-17 Fluid circuit and industrial truck with fluid circuit Withdrawn EP1628020A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200410039848 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 the hydraulic fluid, computer program product, controller and industrial forklift
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 Dump Trailer provided with a safety device, the vehicle comprising such a device and related method for upgrading 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)

* 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

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5326378B2 (en) * 1972-03-15 1978-08-02
GB8425655D0 (en) * 1984-10-10 1984-11-14 Massey Ferguson Services Nv Hydraulic fluid supply assembly
DE4106845C2 (en) * 1991-03-04 1993-03-04 Deere & Co., Moline, Ill., Us, Niederlassung Deere & Co. European Office, 6800 Mannheim, De
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)

* Cited by examiner, † Cited by third party
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
US20060037470A1 (en) 2006-02-23
EP1628020A2 (en) 2006-02-22
DE102004039848A1 (en) 2006-03-09
US7441406B2 (en) 2008-10-28

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