EP0872446A3 - Hydraulic installation for a forklift truck - Google Patents

Hydraulic installation for a forklift truck Download PDF

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Publication number
EP0872446A3
EP0872446A3 EP98107020A EP98107020A EP0872446A3 EP 0872446 A3 EP0872446 A3 EP 0872446A3 EP 98107020 A EP98107020 A EP 98107020A EP 98107020 A EP98107020 A EP 98107020A EP 0872446 A3 EP0872446 A3 EP 0872446A3
Authority
EP
European Patent Office
Prior art keywords
drive
stroke
piston
assigned
lifting
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
EP98107020A
Other languages
German (de)
French (fr)
Other versions
EP0872446B1 (en
EP0872446A2 (en
Inventor
Eckehart Schulze
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.)
Voith Turbo H and L Hydraulic GmbH and Co KG
Original Assignee
Eckehart Schulze
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 Eckehart Schulze filed Critical Eckehart Schulze
Publication of EP0872446A2 publication Critical patent/EP0872446A2/en
Publication of EP0872446A3 publication Critical patent/EP0872446A3/en
Application granted granted Critical
Publication of EP0872446B1 publication Critical patent/EP0872446B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F15B11/02—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
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
    • 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
    • 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
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional 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
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/351—Flow control by regulating means in 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
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F15B2211/353—Flow control by regulating means in 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
    • F15B2211/60—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • 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
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6654—Flow rate 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member
    • F15B2211/761—Control of a negative load, i.e. of a load generating hydraulic energy

Abstract

Bei einem Gabelstapler-Fahrzeug mit einem hydraulischen Hub-Antrieb für die am Mast anhebbare und absenkbare Hebebühne und einem hydraulischen Neigungs-Stellantrieb für den Mast ist der Hubantrieb als einfach-wirkender Hydrozylinder (11) ausgebildet ist. Ein Hub-Steuerventil (14), das eine dem Anhebungsbetrieb zugeordnete Funktionsstellung (I) hat eine dem Stillstand der Antriebszylinderkolbens (13) zugeordnete federzentrierte Mittelstellung als Grundstellung (0) und eine dem Absenkungsbetrieb des Hub-Antriebszylinders zugeordnete Funktionsstellung (II) ist so ausgebildet, daß die Beträge der in den Funktionsstellungen I und II freigegebenen Strömungspfad-Querschnitte steuerbar einstellbar sind und zu den alternativen Auslenkungen eines VentilHaupt-Kolbens (14') proportional sind. Das Hub-Steuerventil (14) ist als 5/3-Wege-Ventil (14) ausgebildet, dessen Hauptkolben (14') mittels eines digital ansteuerbaren elektrischen Stellmotors (96) in seine den verschiedenen Funktionsstellungen (0, I und II) der Hub- Steuerventilanordnung (14) entsprechenden Positionen bewegbar ist. Zur Antriebskopplung des Stellmotors (96) und des Hauptkolbens (14') ist ein nicht-selbsthemmendes Getriebe vorgesehen. Ein Drucksensor (107) erzeugt für den Druck im Antriebsdruckraum (12) des Hub-Antriebszylinders (11) charakteristische elektrische Ausgangssignale, anhand derer die eine elektronischen Steuereinheit (103) eine selbsttätige Begrenzung des Aussteuerhubes des Hauptkolbens (14') auf einen Betrag vermittelt, dem ein lastgerecht-zulässiger Höchstwert der Bewegungsgeschwindigkeit der Hebebühne entspricht.

Figure 00000001
In the case of a forklift truck with a hydraulic lifting drive for the lifting platform that can be raised and lowered on the mast and a hydraulic tilt actuator for the mast, the lifting drive is designed as a single-acting hydraulic cylinder (11). A stroke control valve (14) which has a functional position (I) assigned to the lifting operation, a spring-centered central position assigned to the standstill of the drive cylinder piston (13) as the basic position (0) and a functional position (II) assigned to the lowering operation of the stroke drive cylinder that the amounts of the flow path cross sections released in the functional positions I and II are controllably adjustable and are proportional to the alternative deflections of a main valve piston (14 '). The stroke control valve (14) is designed as a 5/3-way valve (14), the main piston (14 ') of which, by means of a digitally controllable electric servomotor (96), in its various functional positions (0, I and II) - Control valve arrangement (14) corresponding positions is movable. A non-self-locking gear is provided to drive the servomotor (96) and the main piston (14 '). A pressure sensor (107) generates characteristic electrical output signals for the pressure in the drive pressure chamber (12) of the stroke drive cylinder (11), by means of which an electronic control unit (103) conveys an automatic limitation of the actuation stroke of the main piston (14 ') to an amount, which corresponds to a maximum permissible load speed of the lift.
Figure 00000001
EP98107020A 1997-04-20 1998-04-17 Hydraulic installation for a forklift truck Expired - Lifetime EP0872446B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19716442A DE19716442A1 (en) 1997-04-20 1997-04-20 Hydraulic installation on a forklift vehicle
DE19716442 1997-04-20

Publications (3)

Publication Number Publication Date
EP0872446A2 EP0872446A2 (en) 1998-10-21
EP0872446A3 true EP0872446A3 (en) 2000-05-03
EP0872446B1 EP0872446B1 (en) 2003-10-22

Family

ID=7827041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98107020A Expired - Lifetime EP0872446B1 (en) 1997-04-20 1998-04-17 Hydraulic installation for a forklift truck

Country Status (2)

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EP (1) EP0872446B1 (en)
DE (2) DE19716442A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3558861B2 (en) † 1998-03-16 2004-08-25 日立建機株式会社 Tournament oilway components
DE19909713A1 (en) 1999-03-05 2000-09-07 Linde Ag Hydraulic actuator control valve uses slide control and endplates and intermediate plates with endplate tapped bore for channel connections.
DE102011116113A1 (en) * 2011-10-15 2013-04-18 Jungheinrich Aktiengesellschaft Industrial truck with working hydraulic system, has shuttle valve whose output is connected with input of pressure sensor
DE102012024647A1 (en) * 2012-12-17 2014-06-18 Jungheinrich Aktiengesellschaft Hydraulic lifting device for a battery-operated industrial truck
DE102013206319A1 (en) * 2013-04-10 2014-10-16 Deere & Company lifting device
US11613453B2 (en) * 2019-08-29 2023-03-28 The Raymond Corporation Variable hydraulic pressure relief systems and methods for a material handling vehicle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441946A1 (en) * 1984-11-16 1986-05-28 Robert Bosch Gmbh, 7000 Stuttgart HYDRAULIC CONTROL DEVICE
US5036886A (en) * 1988-12-12 1991-08-06 Olson Controls, Inc. Digital servo valve system
EP0498610A2 (en) * 1991-02-05 1992-08-12 Mitsubishi Jukogyo Kabushiki Kaisha A control device for work machines
EP0546300A1 (en) * 1991-12-07 1993-06-16 Robert Bosch Gmbh Electrohydraulic control system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BG37431A1 (en) * 1983-09-27 1985-06-14 Lazarov Hydraulic scheme for tipping lifting device of electrocar for high- lifting
JPH03159879A (en) * 1989-11-20 1991-07-09 Toyota Autom Loom Works Ltd Loading/unloading control device for industrial vehicle
DE4140408A1 (en) * 1991-12-07 1993-06-09 Robert Bosch Gmbh, 7000 Stuttgart, De Electrohydraulic control of linear hydraulic actuator - has proportional flow control valve responding to pressure feedback to provide load compensating action
DE4241846C2 (en) * 1992-12-11 1996-09-26 Danfoss As Hydraulic system
DE29508394U1 (en) * 1995-05-19 1995-08-03 Heilmeier & Weinlein Electro-hydraulic lifting module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3441946A1 (en) * 1984-11-16 1986-05-28 Robert Bosch Gmbh, 7000 Stuttgart HYDRAULIC CONTROL DEVICE
US5036886A (en) * 1988-12-12 1991-08-06 Olson Controls, Inc. Digital servo valve system
EP0498610A2 (en) * 1991-02-05 1992-08-12 Mitsubishi Jukogyo Kabushiki Kaisha A control device for work machines
EP0546300A1 (en) * 1991-12-07 1993-06-16 Robert Bosch Gmbh Electrohydraulic control system

Also Published As

Publication number Publication date
EP0872446B1 (en) 2003-10-22
EP0872446A2 (en) 1998-10-21
DE19716442A1 (en) 1998-10-22
DE59809944D1 (en) 2003-11-27

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