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EP3987119B1 - Machine de travail mobile - Google Patents

Machine de travail mobile Download PDF

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Publication number
EP3987119B1
EP3987119B1 EP20735516.5A EP20735516A EP3987119B1 EP 3987119 B1 EP3987119 B1 EP 3987119B1 EP 20735516 A EP20735516 A EP 20735516A EP 3987119 B1 EP3987119 B1 EP 3987119B1
Authority
EP
European Patent Office
Prior art keywords
control
cylinder
outflow
pump
work machine
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.)
Active
Application number
EP20735516.5A
Other languages
German (de)
English (en)
Other versions
EP3987119A1 (fr
Inventor
Hans Knapp
Josef Stock
Rupert Gappmaier
Christoph Kiegerl
Reinhard WINDHOFER
Florian Altenberger
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.)
Liebherr Werk Bischofshofen GmbH
Original Assignee
Liebherr Werk Bischofshofen GmbH
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.)
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Publication date
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Publication of EP3987119A1 publication Critical patent/EP3987119A1/fr
Application granted granted Critical
Publication of EP3987119B1 publication Critical patent/EP3987119B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2271—Actuators and supports therefor and protection therefor
    • 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
    • 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"
    • 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
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/14—Energy-recuperation means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/422—Drive systems for bucket-arms, front-end loaders, dumpers or the like
    • 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
    • F15B2013/008—Throttling member profiles
    • 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
    • F15B2211/20546—Type of pump variable 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
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30585—Assemblies of multiple valves having a single valve for multiple 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/31523—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member
    • F15B2211/31541—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source and an output member having a single pressure source and multiple 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
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31588—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and multiple 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
    • F15B2211/30—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
    • F15B2211/40—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
    • F15B2211/60—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
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • 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
    • F15B2211/6652—Control of the pressure source, e.g. control of the swash plate angle
    • 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

Definitions

  • the present invention relates to a mobile work machine, in particular a wheel loader, with a preferably open hydraulic circuit and with a pump for conveying a hydraulic medium through the hydraulic circuit and with at least one control block with an inlet control edge and an outlet control edge for controlling the flow of the hydraulic medium, wherein the work machine has a work tool and a cylinder for actuating the work tool and wherein the cylinder has an outlet and an inlet for the hydraulic medium, wherein the outlet is in fluid connection with the outlet control edge and the inlet is in fluid connection with the inlet control edge of the control block.
  • a variable allocation of piston groups for different consumers is intended to ensure that the pumps supply the required amount of oil at the individually associated pressure for each consumer at all times. This enables pure displacement control of the consumers, i.e. the pumps deliver the required amount without hydraulic control by electrically specifying this amount. This avoids losses for different load pressures and for control and increases the energy efficiency of the working machine.
  • a desired quantity is determined from the driver's request in the form of the control lever deflection or similar. This is passed on to the pump, which then provides the delivery quantity. The LS control effort is eliminated. The control block is fully opened and no longer takes part in the quantity allocation.
  • the present invention is based on the object of developing a work machine of the type mentioned at the outset so that it works particularly efficiently.
  • the inlet control edge has no or fewer fine control notches than the outlet control edge, which is equipped with one or more fine control notches, so that when a pulling load is applied to the working tool, the outlet control edge throttles the discharge quantity through the discharge of the cylinder.
  • One or more sensors can be provided to measure the pressure conditions.
  • a pressure regulator is provided which interacts with the pump in such a way that the minimum pressure is maintained on the side of the cylinder on which an increase in volume occurs due to the pulling load.
  • a control system may be provided which is designed to control or regulate the movement of the control block(s).
  • the control block preferably has an inlet and an outlet control.
  • the inlet is controlled by the pump delivery rate and thus preferably has no fine control notch and opens quickly from the middle position to the full cross-section.
  • the outlet side of the control block has the full functionality of a classic control block and accordingly has one or more fine control notches and, if necessary, reduced cross-sections.
  • a classic control block can be used whose inlet control edges are completely dethrottled.
  • the function is limited to the assignment to the respective cylinder side (change of direction of movement) and the outlet throttling if necessary.
  • outlet control edge and the inlet control edge can be combined in one control block or arranged in a separate design, i.e. in separate control blocks.
  • the work machine has a main consumer and an additional consumer, with a control system being provided which is designed such that when there is a pulling load on the work tool and when the load pressure of the additional consumer is lower than that of the main consumer, the discharge control edge of the main consumer closes to such an extent that pressure is built up which is sufficient to actuate the additional consumer.
  • a control system is designed such that when there is a pulling load on the work tool and when the load pressure of the additional consumer is lower than that of the main consumer, the discharge control edge of the main consumer closes to such an extent that pressure is built up which is sufficient to actuate the additional consumer.
  • the 3rd and, if applicable, the 4th control circuit are combined with the hydraulic circuit according to claim 1.
  • the load pressure in the 3rd and possibly 4th control circuit is lower than that of the main function: a pressure compensator on the 3rd or 4th control circuit builds up the pressure by feedback of the high load pressure from the main function to such an extent that the main function does not stop, as is known from the state of the art.
  • the load pressure in the 3rd and possibly 4th control circuit is higher than that of the main function, i.e. the load pressure of the additional consumer is higher than that of the main consumer.
  • the discharge control edge of the main consumer or the control block of the main consumer is closed so far that sufficient pressure is built up for the 3rd and possibly 4th control circuit and the additional consumer is moved.
  • the advantage is that no additional components are required and as long as the main function is used alone, the full energy advantage can be utilized.
  • the bucket pulls the tipping cylinder, i.e. the tipping cylinder is moved by the bucket.
  • the quantity control is now taken over by the control block, which partially closes the cylinder discharge control edge according to the desired movement speed, i.e. throttles it, so that the discharge quantity and thus the movement speed of the bucket and the cylinder can be adjusted.
  • an electrically adjustable pressure regulator of the pump ensures that a minimum pressure is maintained so that the volume created by the cylinder being pulled out is filled. This takes place when the inlet edge of the control block is completely open.
  • the inflow is controlled by the pump's flow rate and therefore does not have a fine control notch.
  • the discharge edge of the control block is provided with a fine control notch so that the discharge speed can be adjusted.
  • fine control notch does not only refer to a fine control notch as such, but is representative of any throttling organ.
  • Fig. 1 shows a schematic representation of the hydraulic circuit with the differently designed inlet control edges ZK and outlet control edges AK of a control block CB.
  • the control block CB is connected to the pressure side of the pump P, a tank T for hydraulic medium and the base side and the rod side of a cylinder.
  • the control block CB regulates the inflow and outflow of a hydraulic medium present in the cylinder by fluidically connecting the base-side B or the rod-side A cylinder reservoir to the pressure side of the pump or the tank via adjustable throttle units, the so-called inlet edges ZK or outlet edges AK.
  • the design of the outlet edge AK and the inlet edge ZK in the control block CB ensures that even in such a state a sufficiently high pressure is present on the outlet side of the consumer (cylinder).
  • the inlet control edge ZK into the bottom-side reservoir of the cylinder has a shape in which a large area is abruptly released so that a throttled inlet from the pump P can flow into the bottom-side reservoir B of the cylinder.
  • Fig. 2 shows the exemplary embedding of the control block CB for controlling a working tool.
  • the adjustable hydraulic pump P is driven mechanically by a motor, e.g. an internal combustion engine or electric motor E.
  • a motor e.g. an internal combustion engine or electric motor E.
  • Hydraulic fluid is supplied to the hydraulic control block CB via the pump P.
  • the position of the control piston in the control block CB (according to Figure 1 ), for example via electro-hydraulic pilot valves (not shown).
  • the corresponding hydraulic fluid quantity is delivered to the relevant hydraulic cylinder of the work tool LC, TC and thus leads to the desired movement of, for example, the lifting arm and/or bucket/fork of the work machine.
  • the control slide adjustment is carried out by the VCU control unit.
  • the input variables M1, M2 for the cylinder pressure on the base and rod side of the cylinder and M5, for example the angle of rotation from a rotary angle sensor on the lifting cylinder LC, which is arranged, for example, on the lifting arm, are read into the VCU control unit.
  • a rotary angle sensor on the lifting cylinder LC which is arranged, for example, on the lifting arm
  • the input variables M3, M4 for the cylinder pressure on the base and rod side of the cylinder and M6, for example the angle of rotation from a rotary angle sensor on the tilting cylinder TC, which is arranged, for example, on the deflection lever, are read into the VCU control unit.
  • a pushing load means that the direction of action of the hydraulic pressure in the cylinder (resulting from the cylinder base and rod-side pressure) and the direction of movement of the cylinder are in the same direction.
  • a pulling load means that the direction of action of the hydraulic pressure in the cylinder (resulting from the cylinder base and rod-side pressure) and the direction of movement of the cylinder are in the opposite direction.
  • the pump pressure regulator PCU of the pump can be either a separate component or integrated into the VCU.
  • Fig. 3 shows a pump control unit PCU, which is designed as a separate component.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (5)

  1. Engin de travail mobile, notamment chargeur sur roues, avec
    un circuit hydraulique,
    une pompe (P) pour transporter un fluide hydraulique à travers le circuit hydraulique, et
    au moins un bloc de commande (CB) avec un bord de commande d'entrée (ZK) et un bord de commande de sortie (AK) pour commander l'écoulement du fluide hydraulique,
    l'engin de travail présentant un outil de travail et un vérin pour actionner l'outil de travail,
    le vérin présentant une sortie et une entrée pour le fluide hydraulique,
    la sortie étant en communication fluidique avec le bord de commande de sortie (AK) et l'entrée étant en communication fluidique avec le bord de commande d'entrée (ZK), et
    le bord de commande d'entrée (ZK) ne présentant pas ou moins d'encoches de commande fines que le bord de commande de sortie (AK) et fonctionnant ainsi largement sans étranglement, tandis que le bord de commande de sortie (AK) est équipé d'une ou de plusieurs encoches de commande fines, de telle sorte qu'en cas de charge de traction sur l'outil de travail, le bord de commande de sortie (AK) étrangle le débit de sortie par la sortie du vérin,
    caractérisé en ce
    qu'un régulateur de pression est prévu, qui coopère avec la pompe (P) de telle sorte qu'une pression minimale est maintenue du côté du vérin où il y a une augmentation de volume due à la charge de traction.
  2. Engin de travail mobile selon la revendication 1, caractérisé en ce qu'il est prévu une commande qui est configurée pour commander le mouvement du ou des blocs de commande (CB).
  3. Engin de travail mobile selon la revendication 1 ou 2, caractérisé en ce qu'il est prévu une commande de pompe qui est configurée pour commander le débit de transport par la pompe (P).
  4. Engin de travail mobile selon l'une quelconque des revendications précédentes, caractérisé en ce que le régulateur de pression consiste en un régulateur de pression de la pompe (P) réglable électriquement.
  5. Engin de travail mobile selon l'une quelconque des revendications précédentes, caractérisé en ce que l'engin de travail présente un consommateur principal et un consommateur supplémentaire et en ce qu'une commande est présente, qui est configurée de telle sorte que, lorsque la pression de charge du consommateur supplémentaire est inférieure à celle du consommateur principal, le bord de commande de sortie (AK) du consommateur principal se ferme suffisamment pour accumuler une pression qui suffit à actionner le consommateur supplémentaire.
EP20735516.5A 2019-06-25 2020-06-25 Machine de travail mobile Active EP3987119B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019117118 2019-06-25
PCT/EP2020/067808 WO2020260450A1 (fr) 2019-06-25 2020-06-25 Engin de travail mobile

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EP3987119A1 EP3987119A1 (fr) 2022-04-27
EP3987119B1 true EP3987119B1 (fr) 2024-10-09

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US (1) US12195950B2 (fr)
EP (1) EP3987119B1 (fr)
DE (1) DE102020116738A1 (fr)
WO (1) WO2020260450A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6397890B1 (en) * 1999-02-15 2002-06-04 Case Corp. Variable metering fluid control valve
DE102006002920A1 (de) 2006-01-20 2007-07-26 Robert Bosch Gmbh Hydraulische Steueranordnung
JP6245611B2 (ja) * 2014-04-18 2017-12-13 キャタピラー エス エー アール エル 制御装置および作業機械
CN107850225B (zh) 2016-05-31 2020-08-21 株式会社小松制作所 滑阀、操作装置和作业车辆
US11841084B2 (en) * 2020-04-06 2023-12-12 Parker-Hannifin Corporation Valve spool with flow force mitigation features

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US20220251804A1 (en) 2022-08-11
WO2020260450A1 (fr) 2020-12-30
WO2020260450A8 (fr) 2021-03-11
EP3987119A1 (fr) 2022-04-27
DE102020116738A1 (de) 2020-12-31
US12195950B2 (en) 2025-01-14

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