EP3987119A1 - Mobile work machine - Google Patents
Mobile work machineInfo
- Publication number
- EP3987119A1 EP3987119A1 EP20735516.5A EP20735516A EP3987119A1 EP 3987119 A1 EP3987119 A1 EP 3987119A1 EP 20735516 A EP20735516 A EP 20735516A EP 3987119 A1 EP3987119 A1 EP 3987119A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control
- cylinder
- work machine
- edge
- control edge
- 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.)
- Pending
Links
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000167880 Hirundinidae Species 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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 a run-off control edge for controlling the flow of the hydraulic medium,
- 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, the outlet being in fluid connection with the outlet control edge and the inlet with the inlet control edge of the control block.
- the present invention is based on the object of developing a work machine of the type mentioned at the outset in such a way 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 the load is pulled on the work tool, the outlet control edge throttles the flow rate through the cylinder outlet.
- cylinder generally stands for one or more piston-cylinder units, the piston being movably accommodated in the cylinder space and dividing it into at least two sub-areas, one of which is the outlet and one the inlet having.
- One or more sensors can be provided which detect the pressure conditions.
- a pressure regulator can be provided which interacts with the pump in such a way that the minimum pressure is maintained on the cylinder side on which the pulling load results in an increase in volume.
- a controller can be provided which is designed to control or regulate the movement of the control block or blocks.
- the control block preferably has an inflow and a flow control. According to the invention, however, the inflow is controlled by the delivery rate of the pump and thus preferably has no fine control notch and opens quickly from the central position to the full cross-section.
- a controller can be present which is designed to control or regulate the delivery rate of the pump through the inlet.
- the drain side on the control block has the full functionality of a classic control block and accordingly has one or more fine control notches and possibly reduced cross-sections.
- a classic control block can therefore be used, the inlet control edges of which are completely dethrottled.
- the function is limited to the assignment to the respective cylinder side (change of direction of movement) and the possibly required discharge throttling.
- the flow control edge and the inlet control edge can be combined in a control block or in a separate design, i.e. be arranged in separate control blocks.
- the work machine has a main consumer and an additional consumer, with a control system that is designed so that when the load is pulling on the work tool and the load pressure of the additional consumer is lower than that of the main consumer, the main consumer uses the process control edge closes so far that pressure is built up that is sufficient to operate the additional consumer. This can also be done by a suitable control.
- the main supplies are preferably also used for subordinate additional functions.
- the lifting supply could tip out a high-tip shovel or the tilting supply could act on a hold-down device, whereby construction effort is saved.
- These functions are called 3rd or 4th control circuit etc., which usually have their own slide.
- the load pressure in the 3rd and, if applicable, the 4th control circuit is lower than that of the main function: a pressure compensator on the 3rd or 4th control circuit, by reporting the high load pressure from the main function, builds up the pressure to such an extent that the main function does not stop, such as this is known from the prior 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 drain control edge of the main consumer or the control block of the main consumer is closed to such an extent that sufficient pressure is built up for the 3rd and, if applicable, 4th control circuit and the additional consumer is moved.
- Fig. 1 is a schematic representation of the Flydraulikniklauf with the differently trained inlet and outlet control edges of a control block
- FIG. 2 a schematic representation of an interconnection of a chopping and a tilting cylinder for a shovel of a working machine
- FIG. 3 a further schematic illustration of an interconnection of a lifting and a tilting cylinder for a shovel of a working machine.
- the bucket pulls the tipping cylinder, i.e. the tipping cylinder is moved by the bucket.
- control block which partially closes the cylinder run-off control edge according to the desired movement speed, i.e. throttles so that the flow rate and thus the speed of movement of the bucket and 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 pulling out the cylinder is filled. This takes place when the inlet edge of the control block is completely open.
- the inflow is controlled by the delivery rate of the pump and therefore has no fine control notch.
- the run-off edge of the control block is provided with a fine control notch so that the run-off speed can be adjusted.
- fine control notch does not only designate a fine control notch as such, but also represents any throttle element.
- Fig. 1 shows a schematic representation of the hydraulic circuit with the differently designed inlet control edges ZK and flow 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 bottom 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 connecting the bottom-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 can be fluidically connected.
- the design of the outlet edge AK and the inlet edge ZK in the control block CB ensures that a sufficiently high pressure is present on the outlet side of the consumer (cylinder) even in such a state.
- the inlet control edge ZK in the bottom reservoir of the cylinder has a shape in which a lot of surface is abruptly released so that a de-throttled inlet from the pump P can flow into the bottom reservoir B of the cylinder.
- Fig. 2 shows the exemplary embedding of the control block CB for Ansteue tion of a work tool.
- the adjustable hydraulic pump P is driven mechanically with a motor, for example an internal combustion 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 (corresponding to FIG. 1) is set via a control unit VCU, for example via electrohydraulic pilot valves (not shown).
- the corresponding amount of hydraulic fluid is delivered to the relevant hydraulic cylinder of the working tool LC, TC and thus leads to the desired movement of, for example, the lifting arm and / or shovel / fork of the working machine.
- the control spool adjustment takes over the control unit VCU.
- the input variables M1, M2 for the cylinder pressure of the bottom and rod side of the cylinder and M5 for example, the angle of rotation from a rotary encoder of the lifting cylinder LC, which is arranged, for example, on the lifting arm, are read into the control unit VCU.
- the input variables M3, M4 for the cylinder pressure of the bottom and rod side of the cylinder and M6, for example the angle of rotation are read into the control unit VCU from a rotary encoder of the tilting cylinder TC, for example arranged on the reversing lever.
- the assessment of whether there is a pulling or a pushing load is carried out by evaluating the lifting / tilting movement using the relevant rotation angle sensors in combination with the cylinder pressures determined.
- the control piston is adjusted according to the stored valve characteristic.
- Pushing load means that the effective direction of the hydraulic pressure in the cylinder (resultant of cylinder bottom and rod side pressure) and the direction of movement of the cylinder go in the same direction.
- Pulling load means that the effective direction of hydraulic pressure in the cylinder (resultant of cylinder bottom and rod side pressure) and the direction of movement of the cylinder go in the opposite direction.
- the pump pressure regulator PCU of the pump can either be a separate component or be integrated in the VCU.
- Fig. 3 shows a pump control unit PCU, which is designed as a separate component.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019117118 | 2019-06-25 | ||
PCT/EP2020/067808 WO2020260450A1 (en) | 2019-06-25 | 2020-06-25 | Mobile work machine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3987119A1 true EP3987119A1 (en) | 2022-04-27 |
Family
ID=71409378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20735516.5A Pending EP3987119A1 (en) | 2019-06-25 | 2020-06-25 | Mobile work machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20220251804A1 (en) |
EP (1) | EP3987119A1 (en) |
DE (1) | DE102020116738A1 (en) |
WO (1) | WO2020260450A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6397890B1 (en) * | 1999-02-15 | 2002-06-04 | Case Corp. | Variable metering fluid control valve |
DE102006002920A1 (en) * | 2006-01-20 | 2007-07-26 | Robert Bosch Gmbh | Hydraulic load control arrangement for operating tool, has area in which pressurizing medium flows from reverse to forward feed and provided with regeneration, and area of pressurizing medium provided without regeneration |
JP6245611B2 (en) * | 2014-04-18 | 2017-12-13 | キャタピラー エス エー アール エル | Control device and work machine |
WO2017208374A1 (en) * | 2016-05-31 | 2017-12-07 | 株式会社小松製作所 | Spool valve, operating device, and working vehicle |
US11841084B2 (en) * | 2020-04-06 | 2023-12-12 | Parker-Hannifin Corporation | Valve spool with flow force mitigation features |
-
2020
- 2020-06-25 EP EP20735516.5A patent/EP3987119A1/en active Pending
- 2020-06-25 US US17/620,131 patent/US20220251804A1/en active Pending
- 2020-06-25 DE DE102020116738.5A patent/DE102020116738A1/en active Pending
- 2020-06-25 WO PCT/EP2020/067808 patent/WO2020260450A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2020260450A1 (en) | 2020-12-30 |
DE102020116738A1 (en) | 2020-12-31 |
WO2020260450A8 (en) | 2021-03-11 |
US20220251804A1 (en) | 2022-08-11 |
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