EP0129652A1 - Système hydraulique de commande des circuits hydrauliques de direction et de travail pour les véhicules - Google Patents

Système hydraulique de commande des circuits hydrauliques de direction et de travail pour les véhicules Download PDF

Info

Publication number
EP0129652A1
EP0129652A1 EP84103939A EP84103939A EP0129652A1 EP 0129652 A1 EP0129652 A1 EP 0129652A1 EP 84103939 A EP84103939 A EP 84103939A EP 84103939 A EP84103939 A EP 84103939A EP 0129652 A1 EP0129652 A1 EP 0129652A1
Authority
EP
European Patent Office
Prior art keywords
valve
hydraulic
steering
control
hydraulic pump
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
EP84103939A
Other languages
German (de)
English (en)
Other versions
EP0129652B1 (fr
Inventor
Heribert Dipl.-Landwirt Adams
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.)
Kloeckner Humboldt Deutz AG
Original Assignee
Kloeckner Humboldt Deutz 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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT84103939T priority Critical patent/ATE27640T1/de
Publication of EP0129652A1 publication Critical patent/EP0129652A1/fr
Application granted granted Critical
Publication of EP0129652B1 publication Critical patent/EP0129652B1/fr
Expired legal-status Critical Current

Links

Images

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
    • 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
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • F15B2211/20576—Systems with pumps with multiple pumps
    • 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
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • 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
    • F15B2211/40523—Flow control characterised by the type of flow control means or valve with flow dividers
    • F15B2211/4053—Flow control characterised by the type of flow control means or valve with flow dividers using 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
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid 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
    • F15B2211/40—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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • 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
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

Definitions

  • the invention relates to a hydraulic control system for the steering and working hydraulics including a controllable power lift system on vehicles, in particular agricultural tractors, with two hydraulic circuits, each connected to a hydraulic pump and connectable to one another by actuating a cut-in valve, for supplying hydraulic consumers with hydraulic fluid, the first hydraulic circuit the hydraulic steering system is supplied by the hydraulic pump via an element that primarily supplies hydraulic fluid and the amount of fluid not required for the steering flows to the downstream power lift via one or more directional control valves for other consumers, and in the second hydraulic circuit the hydraulic pump supplies the auxiliary valve with the Storage container is connected.
  • a control system of this type has become known (Oil Hydraulics & Pneumatics 24 (1980) No. 11 ,, p. 810, Figure 4), the one hydraulic pump being connected to a flow divider which primarily supplies the steering hydraulics with hydraulic fluid. The residual flow from the flow divider is fed to the power lift and is sufficient in terms of quantity regulating mode of operation of the same.
  • the second hydraulic pump is connected directly to the reservoir via a connecting valve and to the hydraulic circuit of the first hydraulic pump via a check valve. When actuating a directional valve to supply one of the other consumers with hydraulic fluid, the changeover valve is closed by means of a control pressure, so that sufficient hydraulic fluid flows to the consumer through the combination of the two hydraulic circuits.
  • the second hydraulic circuit can only be used in conjunction with the first hydraulic circuit, so that the two hydraulic circuits cannot be used separately, as is desirable in some cases.
  • the invention has for its object, while avoiding the disadvantage described, to improve a control system of the type outlined at the outset in such a way that the two hydraulic circuits present in the control system are also available separately for supplying hydraulic consumers if required.
  • the aim is also to ensure that the sequence valve in the short re elimpulse g does not respond the power lift.
  • the object is achieved in that in the second hydraulic circuit in the line between the hydraulic pump and the connection valve one or more directional valves for supplying other consumers with hydraulic fluid are arranged and that in one of the control lines leading from the power valve to the connection valve at least one delay element for the control pulses acting on the connecting valve in the closing direction is provided.
  • both hydraulic circuits can also be used independently of one another.
  • the second hydraulic circuit can be used for other loads because the power lift for normal running rbeits- A (control) with the not claimed by the steering hydraulic flow of this hydraulic pump manages.
  • the steering hydraulics for supplying hydraulic fluid is connected to the hydraulic pump via a priority valve. It is useful if the connection valve is housed in the control unit of the power lift.
  • Two hydraulic pumps 1 and 2 which are preferably designed as tandem pumps, are connected on the suction side via lines 3 and 4 and a filter 5 and 6, respectively, to the reservoir 7 for pressure fluid.
  • the hydraulic pump 1 supplies a first hydraulic circuit with a steering hydraulic system 8, which is connected via a priority valve 10 to a line 11 emanating from the hydraulic pump on the pressure side.
  • a line 12 leads from the priority valve 10 back to the reservoir 7.
  • the priority valve 10 is designed such that it only supplies the hydraulic fluid quantity required for steering to the steering hydraulics.
  • a line 13 leaving the priority valve 10 leads through a valve block 14 to a directional valve block 15, in which a directional control valve 16 assigned to the first hydraulic circuit is shown in simplified form.
  • a servo control apparatus 18 for a K is flanged over rafthe-, the lifting cylinder is denoted with the nineteenth Within the control unit 18, the line 13 coming from the directional control valve 16 is connected to a control valve 20 on the input side.
  • the control valve 20 is connected on the output side via a line 21 to a line 22 which is connected to the reservoir 7 via a hydraulic fluid cooler 23 and a filter 24.
  • a line 25 branches off from line 13 in the direction of flow upstream of control valve 20 and is connected to one end face 27 of control valve 20 by means of a control line 26 and to line 30 via a spring-reinforced check valve 28.
  • the line 30 connects the lifting cylinder 19 of the power lift via a flow control valve 31 to a pilot valve 32 of the power lift system arranged in the reservoir 7.
  • the pilot valve 32 designed as a three-way valve is also connected by a line 33 to the end face 35 of the control valve 20 which is loaded by a spring 34.
  • the pilot spool 32 is activated by a control linkage, not shown, which compares actual values of tensile force or position measurements with predetermined target values.
  • a control valve 37 is also accommodated in the control unit 18 of the power lift, which is loaded on one end 38 in the closing direction by a spring 39 and the other end 40 of which is connected to the line 13 by a line 41.
  • the spring-side end face 38 of the connecting valve 37 is connected to the line 33 ′ by control lines 42, 43, a check valve 44 and a line 43 entering the line 42 Throttle body 45 is arranged.
  • a line 46 leads to line 22 from the connecting valve 37 designed as a two-way valve.
  • line 43 is also connected to line 13 by means of line 47, in which a throttle element 48 is arranged.
  • the other hydraulic pump 2 is connected to a directional valve block 51 on the pressure side by means of a line 50 and a valve block 14 to supply a second hydraulic circuit, a single directional valve 52 being shown in simplified form.
  • the line 50 is connected via a check valve 53 to the line 13 of the first hydraulic circuit supplied by the hydraulic pump 1.
  • the check valve 53 In the flow direction upstream of the check valve 53, there is a connection between the line 50 and the inlet of the connection valve 37 through a line 54.
  • the hydraulic pump 1 conveys in operation continuously pressurized fluid in the first hydraulic circuit, wherein the Lenkhy - hydraulics is primarily supplied with pressurized liquid.
  • the priority valve 10 only controls the hydraulic fluid quantity required for steering directly to the steering hydraulics, while for the rest of the time in which there is no steering, the full pressure medium flow is available to the other consumers, in particular this hydraulic circuit. If no other consumer is connected to the first hydraulic circuit, the amount of hydraulic fluid not required by the steering flows through line 13 and directional valve block 15 as well as through control valve 20 and lines 21 and 22 back to reservoir 7.
  • pilot valve 32 is added sink impulses acting on them from the shown neutral position to the right and moved to the left with lifting pulses.
  • a control pressure is built up in the line 33 via the line 47 and the D ROS selorgan 48 which supports actuated by the force of the spring 34, the control valve 20 in the closing direction, so that through line 25, check valve 28 and the line 30 hydraulic fluid flows to the lifting cylinder 19.
  • a lifting process of the power lift or the connected implement follows. If, on the other hand, the pilot spool 32 is moved to the right from the neutral position, the control line 33 is relieved of pressure, the control valve 20 being in the open position shown. At the same time, pressure fluid can flow out of the lifting cylinder 19 through the line 30 and the flow control valve 31, so that a lowering operation takes place on the power lift or on the implement.
  • the pressure present in line 13 is constantly present on the front side 40 of the connecting valve 37, while only the force of the spring 39 acts on the front side 38 thereof when the pilot valve 32 is open.
  • the connecting valve 37 is thus in the closed position shown.
  • the pilot valve 32 is only moved briefly from the neutral position in one direction or the other when the control valve is "regulated” due to the short control times that occur.
  • these short movements of the pilot spool 32 are in no way sufficient to build up a control pressure on the front side 38 of the connecting valve 37 as a result of the throttle 45 connected upstream as a delay element, which is supported by the force of the spring 39 large enough to influence the connecting valve 37 in the closing direction.
  • the connecting valve 37 is due to the pressure build-up on the end face 38 supported by the force of the spring 39 in the closed position.
  • the return flow of the pressure fluid from the second hydraulic circuit fed by the hydraulic pump 2 is blocked through the line 54, the connecting valve 37 and the lines 46, 22 to the reservoir 7, and pressure fluid flows from the second hydraulic circuit through the check valve 53 into the line 13 of the first hydraulic circuit.
  • the first hydraulic circuit is thus supplied with the additional quantity of pressure medium required for the quick lifting of an implement.
  • directional valves 16 can of course also be connected to the first hydraulic circuit via one or more directional valves 16.
  • a directional control valve of this block When a directional control valve of this block is activated, the pressure medium in line 13 is shut off and supplied to a consumer (not shown). The line 13 is depressurized behind the directional valve. The connecting valve 37 is then displaced in the closing direction by the force of the spring 39 and the outflow of the pressure medium from the circuit of the hydraulic pump 2 is shut off via the lines 54, 46.
  • the directional control valves 16 always have the flow rates of both hydraulic circuits available, provided directional control valves 52 are not activated.
  • One or more consumers can be connected to the second hydraulic circuit supplied by the hydraulic pump 2 independently of the first hydraulic circuit and can be switched on and off via the directional valves 52.
  • one of which is connected to the second hydraulic circuit on one of the directional valves 52 may for example be a consumer Mähwerksmotor, while the A ushubzylinder the mower is connected to the first hydraulic circuit via one of the directional control valves 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Power Steering Mechanism (AREA)
EP84103939A 1983-05-28 1984-04-09 Système hydraulique de commande des circuits hydrauliques de direction et de travail pour les véhicules Expired EP0129652B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103939T ATE27640T1 (de) 1983-05-28 1984-04-09 Hydraulisches steuersystem fuer die lenk- und arbeitshydraulik an fahrzeugen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3319533 1983-05-28
DE19833319533 DE3319533A1 (de) 1983-05-28 1983-05-28 Hydraulisches steuersystem fuer die lenk- und arbeitshydraulik an fahrzeugen

Publications (2)

Publication Number Publication Date
EP0129652A1 true EP0129652A1 (fr) 1985-01-02
EP0129652B1 EP0129652B1 (fr) 1987-06-03

Family

ID=6200219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103939A Expired EP0129652B1 (fr) 1983-05-28 1984-04-09 Système hydraulique de commande des circuits hydrauliques de direction et de travail pour les véhicules

Country Status (3)

Country Link
EP (1) EP0129652B1 (fr)
AT (1) ATE27640T1 (fr)
DE (2) DE3319533A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117905738A (zh) * 2023-07-06 2024-04-19 新疆新研牧神科技有限公司 顺序启动液压系统及收获机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5332053A (en) * 1993-01-26 1994-07-26 Aquilon Technologies Inc. Hydraulic drive system
CN110206776A (zh) * 2019-07-16 2019-09-06 郑州宇通重工有限公司 一种液压保压与自卸荷节能阀组
IT202100010577A1 (it) * 2021-04-27 2022-10-27 Cnh Ind Italia Spa Circuito idraulico per un veicolo agricolo provvisto di un sistema antisaturazione e metodo di controllo di antisaturazione
IT202100010601A1 (it) * 2021-04-27 2022-10-27 Cnh Ind Italia Spa Circuito idraulico per un veicolo agricolo provvisto di un sistema antisaturazione e metodo di controllo di antisaturazione

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448576A (en) * 1967-08-17 1969-06-10 Westinghouse Air Brake Co Fluid control system
FR2039123A1 (fr) * 1969-12-19 1971-01-15 Poclain Sa
FR2280815A1 (fr) * 1974-08-02 1976-02-27 Kloeckner Humboldt Deutz Ag Installation de commande hydraulique pour tracteurs agricoles

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2458897A1 (de) * 1974-12-12 1976-06-24 Int Harvester Co Elbsttaetige steuereinrichtung zur verteilung von druckfluessigkeit einer druckfluessigkeitsquelle auf mehrere verschiedenrangige hydrauliksysteme
DE2625101C2 (de) * 1976-06-04 1985-11-14 Robert Bosch Gmbh, 7000 Stuttgart Hydraulische Steuereinrichtung zur volumenstromabhängigen Verteilung von Druckflüssigkeit auf zwei Systeme
DE2644717A1 (de) * 1976-10-04 1978-04-06 Abex Gmbh Hydraulische regeleinrichtung, insbesondere fuer knicklader mit lade- und lenkhydraulik
DE2837605A1 (de) * 1978-08-29 1980-03-06 Kloeckner Humboldt Deutz Ag Steuereinrichtung fuer den hydraulischen kraftheber eines schleppers
DE2855749A1 (de) * 1978-12-22 1980-06-26 Int Harvester Co Hydraulische steuereinrichtung zur verteilung von druckfluessigkeit mindestens einer, insbesondere von zwei druckfluessigkeitsquellen auf mehrere verschiedenrangige verbraucher
DE3237019C2 (de) * 1981-10-07 1994-07-28 Linde Ag Hublader mit einer Lenkanlage mit hydrostatischer Lenkkraftunterstützungsanlage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448576A (en) * 1967-08-17 1969-06-10 Westinghouse Air Brake Co Fluid control system
FR2039123A1 (fr) * 1969-12-19 1971-01-15 Poclain Sa
FR2280815A1 (fr) * 1974-08-02 1976-02-27 Kloeckner Humboldt Deutz Ag Installation de commande hydraulique pour tracteurs agricoles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117905738A (zh) * 2023-07-06 2024-04-19 新疆新研牧神科技有限公司 顺序启动液压系统及收获机

Also Published As

Publication number Publication date
DE3464083D1 (en) 1987-07-09
ATE27640T1 (de) 1987-06-15
EP0129652B1 (fr) 1987-06-03
DE3319533A1 (de) 1984-11-29

Similar Documents

Publication Publication Date Title
EP0053323B1 (fr) Système de transmission hydrostatique comprenant une pompe variable et plusieurs utilisateurs
DE4100988C2 (de) Hydraulisches Antriebssystem
DE2435602A1 (de) Elbsttaetige steuereinrichtung zur verteilung von druckfluessigkeit auf zwei hydrauliksysteme
DE4137963C2 (de) Ventilanordnung zur lastunabhängigen Steuerung mehrerer hydraulischer Verbraucher
DE10000110A1 (de) Hydrostatischer Fahrzeugantrieb mit Steuerungseinrichtung und Steuerungseinrichtung für hydrostatische Antriebe
DE2025040A1 (de) Laengenveraenderlicher Oberlenker fuer eine Dreipunkt-Anhaengevorrichtung
DE102007045803A1 (de) Hydraulische Steueranordnung
EP3625457B1 (fr) Dispositif de contrôle de l'approvisionnement d'au moins un consommateur hydraulique avec fluide
DE2458897A1 (de) Elbsttaetige steuereinrichtung zur verteilung von druckfluessigkeit einer druckfluessigkeitsquelle auf mehrere verschiedenrangige hydrauliksysteme
EP0244418B1 (fr) Dispositif de commande de fluide de pression
DE3814508C2 (fr)
DE102006019804B4 (de) Hydraulische Lenkung
EP0129652B1 (fr) Système hydraulique de commande des circuits hydrauliques de direction et de travail pour les véhicules
DE3837395A1 (de) Hydrostatische hilfskraftlenkung fuer fahrzeuge
DE4230183C2 (de) Steuervorrichtung für Hydromotoren
DE19709958B4 (de) Hydrostatisches Antriebssystem
EP0563514B1 (fr) Appareil d'entraînement hydraulique indépendant de la charge pour outils de machines de chantier
EP2028376B1 (fr) Agencement de commande hydraulique
DE2031587C3 (de) Hydraulikanlage für eine Zugmaschine
DE69505892T2 (de) Servolenkung
DE2829551A1 (de) Stroemungsvereinigungssystem
DE2837605C2 (fr)
DE4420166C1 (de) Regelungsverfahren und elektrohydraulisches Regelsystem für einen Verbraucher eines Arbeitsgeräts
DE2722238C2 (de) Aus mehreren Wegeventilen gebildeter Steuerblock
DE3632959C2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE FR GB IT

17P Request for examination filed

Effective date: 19841108

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB IT

REF Corresponds to:

Ref document number: 27640

Country of ref document: AT

Date of ref document: 19870615

Kind code of ref document: T

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 3464083

Country of ref document: DE

Date of ref document: 19870709

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19890308

Year of fee payment: 6

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19900409

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910117

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910313

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19910315

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920409

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19921230

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST