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NL2027457B1 - A system comprising differential hydraulic cylinders and a hydraulic machine comprising the system. - Google Patents

A system comprising differential hydraulic cylinders and a hydraulic machine comprising the system. Download PDF

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Publication number
NL2027457B1
NL2027457B1 NL2027457A NL2027457A NL2027457B1 NL 2027457 B1 NL2027457 B1 NL 2027457B1 NL 2027457 A NL2027457 A NL 2027457A NL 2027457 A NL2027457 A NL 2027457A NL 2027457 B1 NL2027457 B1 NL 2027457B1
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NL
Netherlands
Prior art keywords
generator
hydraulic
variable displacement
flow line
bidirectional
Prior art date
Application number
NL2027457A
Other languages
Dutch (nl)
Inventor
Petrus Franciscus Lepoutre Johannes
Original Assignee
Lepotech B V
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
Application filed by Lepotech B V filed Critical Lepotech B V
Priority to NL2027457A priority Critical patent/NL2027457B1/en
Priority to PCT/NL2022/050038 priority patent/WO2022164315A1/en
Priority to EP22702326.4A priority patent/EP4284749A1/en
Application granted granted Critical
Publication of NL2027457B1 publication Critical patent/NL2027457B1/en

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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
    • 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
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2091—Control of energy storage means for electrical energy, e.g. battery or capacitors
    • 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
    • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
    • E02F9/2095—Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans
    • 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
    • E02F9/2221—Control of flow rate; Load sensing arrangements

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

A system for moving a tool such as a boom, dipper, bucket or hook of a hydraulic machine such as an excavator, crane or forklift and a hydraulic machine such as an excavator, crane or forklift comprising the system, said system comprising a first bidirectional hydraulic variable displacement pump, coupled for liquid flow, via a first flow line to a first differential hydraulic cylinder; a first generator; a second generator arranged, when said second generator is in a first operational mode, to be driven by said first generator for generating electrical energy, and when said second generator is in a second operational mode, arranged for driving, together with said first generator, said first bidirectional hydraulic variable displacement pump; a third bidirectional hydraulic pump, a first bidirectional hydraulic motor and a first tank, wherein said third bidirectional hydraulic pump is arranged to be driven by said first bidirectional hydraulic motor for supplying liquid from said tank to said first flow line and/or adding liquid to said tank from said first flow line; a third flow line, wherein said third hydraulic pump is controlled such that a difference of a flow rate of said liquid in said third flow line and a flow rate of said liquid in said first flow line is within a predetermined range, preferably wherein said flow rates are equal.

Description

Title: A system comprising differential hydraulic cylinders and a hydraulic machine comprising the system. Description According to a first aspect, the present disclosure relates to a system for moving a tool such as a boom, dipper, bucket or hook of a hydraulic machine such as an excavator, crane or forklift.
According to a second aspect, the present disclosure relates to a hydraulic machine such as an excavator, crane or forklift comprising a system according to the first aspect of the present disclosure.
A known hydraulic system for moving a tool such as a boom, dipper, bucket or hook of a hydraulic machine such as an excavator, crane or forklift comprises a diesel engine for driving a hydraulic pump that is arranged for operating a hydraulic cylinder. A drawback of this known system is that it can be improved as regards the energy efficiency.
An objective of the present disclosure is to provide a hydraulic system that has a relative high energy efficiency.
The objective is achieved in that the system according to the first aspect of the present disclosure comprises differential hydraulic cylinders for moving a tool such as a boom, dipper, bucket or hook of a hydraulic machine such as an excavator, crane or forklift.
The system further comprises a first bidirectional hydraulic variable displacement pump, coupled for liquid flow, via a first flow line of said system, to one of a piston rod side and a cylinder base side of a first differential hydraulic cylinder of said differential hydraulic cylinders for operating said first differential hydraulic cylinder. Within the context of the present disclosure operating such a hydraulic cylinder is to be understood as providing and removing a liquid, such as a hydraulic oil, from said hydraulic cylinder for moving a piston rod of the hydraulic cylinder relative to a housing of the hydraulic cylinder.
Within the context of the present disclosure, a bidirectional pump is to be understood as a pump that is arranged for pumping a liquid, such as a hydraulic fluid, from a first outlet port of the pump or a second outlet port of the pump while rotating in one direction.
Within the context of the present disclosure, a hydraulic variable displacement pump refers to a hydrostatic pump. In addition, the system comprises a first generator coupled to said first bidirectional hydraulic variable displacement pump for driving said first bidirectional hydraulic variable displacement pump. The first generator may for instance be provided with an output axle that is mechanically coupled to the first bidirectional hydraulic variable displacement pump. It is noted that due to the provision of the bidirectional pump instead of a bi-rotational pump, there is no need for the first generator to be arranged for driving the output axle thereof in two directions. This is beneficial for realising a system having a relative low complexity and thereby being relatively robust. A second generator of the system according to the present disclosure is coupled to said first generator and arranged, when said second generator is in a first operational mode, to be driven by said first generator for generating electrical energy, and when said second generator is in a second operational mode, arranged for driving, together with said first generator, said first bidirectional hydraulic variable displacement pump. The first operational mode is beneficial for realising a relative high energy efficiency of the system for instance when the first generator is outputting more power than required for operating the differential hydraulic cylinder. In this instance the surplus of output power may be converted into electrical energy. The second operational mode is beneficial for increasing the power provided to the first bidirectional hydraulic variable displacement pump beyond a level that may be achieved by the first generator. This allows for a first generator having a relative low maximum power output. The system may further comprise a third bidirectional hydraulic pump, a first bidirectional hydraulic motor and a first tank, wherein said first bidirectional hydraulic variable displacement pump is coupled for liquid flow via said first flow line to said one of said piston rod side and said cylinder base side of said first differential cylinder via said first bidirectional hydraulic motor, wherein said third bidirectional hydraulic pump is arranged to be driven by said first bidirectional hydraulic motor for supplying liquid from said first tank to said first flow line and/or adding liquid to said first tank from said first flow line. This allows for setting a flow rate of liquid in said first flow line to a predetermined range or value for moving the piston rod relative to the piston housing.
It is pointed out that due to the presence of a piston rod at only one side of a piston element that is movable inside the cylinder housing for moving said piston rod, an effective surface of the piston element at the side of the piston rod is smaller than an effective surface of the piston element at the side of the cylinder base. By providing the third bidirectional hydraulic pump, the first bidirectional hydraulic motor and the first tank the velocities of moving the piston rod in and out the cylinder housing may be adapted.
In an embodiment, the system according to the first aspect may comprise a third flow line that couples said first bidirectional hydraulic variable displacement pump for liquid flow to the other of said piston rod side and said cylinder base side of said first differential hydraulic cylinder, wherein said third hydraulic pump is controlled such that a difference of a flow rate of said liquid in said third flow line and a flow rate of said liquid in said first flow line is within a predetermined range, preferably wherein said flow rates are equal.
In an embodiment, the system according to the first aspect of the present disclosure comprises: - a second bidirectional hydraulic variable displacement pump coupled for liquid flow, via a second flow line of said system, to one of a piston rod side and a cylinder base side of a second differential hydraulic cylinder of said differential hydraulic cylinders for operating said second differential hydraulic cylinder; wherein said first generator is further coupled to said second bidirectional hydraulic variable displacement pump for driving said second bidirectional hydraulic variable displacement pump and wherein said second generator is arranged, when said second generator is in said second operational mode, for driving, together with said first generator, said first and second bidirectional hydraulic variable displacement pumps. The system may further comprise a fourth bidirectional hydraulic pump, a second bidirectional hydraulic motor and a second tank, wherein said second bidirectional hydraulic variable displacement pump is coupled for liquid flow via said second flow line to said one of said piston rod side and said cylinder base side of said second differential cylinder via said second bidirectional hydraulic motor, wherein said fourth bidirectional hydraulic pump is arranged to be driven by said second bidirectional hydraulic motor for supplying liquid from said second tank to said second flow line and/or adding liquid to said second tank from said second flow line. In an embodiment, the system according to the first aspect may comprise a fourth flow line that couples said second bidirectional hydraulic variable displacement pump for liquid flow to the other of said piston rod side and said cylinder base side of said second differential hydraulic cylinder, wherein said fourth bidirectional hydraulic pump is controlled such that a difference of a flow rate of said liquid in said fourth flow line and a flow rate of said liquid in said second flow line is within a predetermined range, preferably wherein said flow rates are equal.
It is advantageous, if said first and/or second bidirectional hydraulic variable displacement pumps are coupled to said second generator and wherein said second generator is further arranged, when said second generator is in a third operational mode, to be driven by said first and/or second bidirectional hydraulic variable displacement pumps for generating electrical energy. The third operational mode is beneficial for realising a relative high energy efficiency of the system. It is beneficial if one of said third hydraulic pump and said first bidirectional hydraulic motor has a variable displacement. This is beneficial for setting a flow rate of liquid in said first flow line to a predetermined range or value for moving the piston rod relative to the piston housing. It is beneficial if one of said fourth bidirectional hydraulic pump and said second bidirectional hydraulic motor has a variable displacement. This is beneficial for setting a flow rate of liquid in said second flow line to a predetermined range or value for moving the piston rod relative to the piston housing. In an embodiment of the system according to the first aspect, said 5 first bidirectional hydraulic variable displacement pump is coupled for liquid flow, by said first flow line, with said piston rod side of said first differential hydraulic cylinder via said first bidirectional hydraulic motor. This is beneficial for realizing a system that is intended for use in an application wherein the tool exerts a relative large force on the piston rod when the piston rod is moved away from the cylinder base.
In an embodiment of the system according to the first aspect, said first bidirectional hydraulic variable displacement pump is coupled for liquid flow, by said first flow line, with said cylinder base rod side of said first differential hydraulic cylinder via said first bidirectional hydraulic motor. This is beneficial for realizing a system that is intended for use in an application wherein the tool exerts a relative large force on the piston rod when the piston rod is moved towards the cylinder base.
In an embodiment of the system according to the first aspect, said third hydraulic pump is arranged for supplying liquid from said first tank in a section of said first flow line between said first bidirectional hydraulic motor and said first bidirectional hydraulic variable displacement pump and/or wherein said third hydraulic pump is arranged for adding liquid to said first tank from said section of said first flow line.
It is advantageous if, said system further comprises a fifth hydraulic pump, wherein said fifth hydraulic pump is arranged for maintaining a pressure of said liquid in said first flow line within a predetermined range, by supplying liquid from said first tank or a further tank of said system to said first flow line.
In this regard, it is beneficial if said fifth hydraulic pump has a variable displacement and/or is unidirectional.
In an embodiment of the system according to the first aspect, said fifth hydraulic pump is arranged for maintaining a pressure in said first flow line in a range of 20 to 30 barg, preferably 25 barg.
In this regard, it is beneficial if the fifth hydraulic pump is arranged for further maintaining a pressure in said second, third and/or fourth flow line in a range of 20 to 30 barg, preferably 25 barg.
In a yet further embodiment of the system according to the present disclosure, the fifth hydraulic pump is arranged for maintaining a pressure in all flow lines for hydraulic fluid in a range of 20 to 30 barg, preferably 25 barg. It is beneficial if, said system further comprises a load detector for detecting a load factor of said first generator and a control unit, communicatively coupled to said load detector, wherein said control unit is arranged for bringing said second generator in said first operational mode or said second operational mode taking into account a load factor detected by said load detector. Preferably, said system further comprises a storage unit arranged for storing electrical energy generated, when in said first operational mode or third operational mode, by said second generator and supplying electrical energy, when said second generator is in said second operational mode. In this regard, it is beneficial if said second generator is in said first operational mode when the first generator is outputting more power than required for operating the differential hydraulic cylinder and a ratio of an actual charge of the storage unit and a maximum charge capacity of the storage unit is lower than a predetermined amount, preferably lower than 0.9, more preferably lower than 0.75. In other words, when the amount of electric charge stored in the storage unit drops below the predetermined amount while the first generator is outputting more power than required, the storage unit is charged by the second generator. Should the amount of electric charge be larger than the predetermined amount, the second generator will not charge the storage unit.
It is advantageous if said first generator comprises an internal combustion engine, preferably a diesel engine.
According to the second aspect, the present disclosure relates to a hydraulic machine such as an excavator, crane or forklift comprising a system according to the first aspect of the present disclosure for moving a tool of said hydraulic machine.
Embodiments of the system according to the first aspect of the present disclosure presented previously correspond to or are similar to embodiments of the hydraulic machine according to the second aspect of the present disclosure.
Effects of the system according to the first aspect of the present disclosure presented previously correspond to or are similar to effects of the hydraulic machine according to the second aspect of the present disclosure.
It is advantageous if said hydraulic machine is a forklift a container handler. Preferably, said container handler is arranged for handling containers according to ISO 668:2020.
In this regard, it is beneficial if said forklift or container handler is provided with a system wherein said first and/or second bidirectional hydraulic variable displacement pumps are coupled to said second generator and wherein said second generator is further arranged, when said second generator is in a third operational mode, to be driven by said first and/or second bidirectional hydraulic variable displacement pumps for generating electrical energy. This is attractive for recovering a part of the energy provided, by the first generator or provided by the first and second generator together, during lifting a load such as a container when lowering the load.
The present disclosure will now be explained by means of a description of an embodiment of a system in accordance to the first aspect, and a hydraulic machine according to the second aspect, in which reference is made to the following schematic figures, in which:
Fig. 1 a schematic overview of a system according to the first aspect of the present disclosure is shown; Fig. 2 elements of a system according to the first aspect of the present disclosure are shown; Fig. 3 elements of another system according to the first aspect of the present disclosure are shown; Fig. 4 elements of a further system according to the first aspect of the present disclosure are shown; Fig. 5 elements of yet another system according to the first aspect of the present disclosure are shown; Fig. 6 a hydraulic machine according to the second aspect of the present disclosure is shown.
The system 1 comprises multiple differential hydraulic cylinders 3, 5, 7, 9, for moving a tool such as a boom, dipper, bucket or hook of a hydraulic machine such as an excavator or a crane.
The system 1 further comprises a first bidirectional hydraulic variable displacement pump 11 for operating first differential hydraulic cylinders 3, 5 of the differential hydraulic cylinders 3, 5, 7, 9. The first bidirectional hydraulic variable displacement pump 11 is coupled, for liquid flow, via a first flow line 25 to a piston rod side 27 of the first differential hydraulic cylinder 3, 5 and via a third flow line 39 to a cylinder base side 37 of the first differential hydraulic cylinder 3, 5. Both the first flow line 25 and the third flow line 39 are coupled via a pilot operated check valve 34, wherein the pilot operated check valve 34 is pilot to open, to the respective cylinder base side 37 and the piston rod side 27 of the first differential hydraulic cylinder 3, 5, for blocking liquid flow from the first differential hydraulic cylinder 3, 5 back into the first flow line 25 and/or the third flow line 39. The valve 34 is further arranged for completely blocking the flow from the first flow line 25 and/or the third flow line 39 into the first differential hydraulic cylinder 3, 5, for example when the system 1 is not operational.
The system 1 furthermore comprises a second bidirectional hydraulic variable displacement pump 13 for operating second differential hydraulic cylinders 7,
9 of the differential hydraulic cylinders 3, 5, 7, 9. The second bidirectional hydraulic variable displacement pump 13 is coupled, for liquid flow, via a second flow line 31 and via a further pilot operated check valve {not shown), wherein the further pilot operated check valve is pilot to open, to a piston rod side of the second differential hydraulic cylinder 7, 9 and via a fourth flow line 40 and via the further check valve to a cylinder base side 37 of the second differential hydraulic cylinder 7, 9. A first generator 15, which comprises an internal combustion engine, is coupled to the first bidirectional hydraulic variable displacement pump 11 and the second bidirectional hydraulic variable displacement pump 13 for driving the first bidirectional hydraulic variable displacement pump 11 and the second bidirectional hydraulic variable displacement pump 13.
A second generator 17 is coupled to the first generator 15 as well to the first and second bidirectional hydraulic variable displacement pumps 11, 13. When the second generator 17 is in a first operational mode, the second generator 17 is driven by the first generator 15 for generating electrical energy. When the second generator 17 is in a second operational mode, the second generator 17 is arranged for driving, together with the first generator 15, the first and second bidirectional hydraulic variable displacement pump 11,13. When the second generator 17 is in a third operational mode, the second generator 17 is driven by the first and/or second bidirectional hydraulic variable displacement pump 11, 13 for generating electrical energy.
In the first and third operational mode, the generated electrical energy is stored in a storage unit 41 if a ratio of an actual charge of the storage unit 41 and a maximum charge capacity of the storage unit 41 is lower than 0.75. In case the second generator 17 is in the second operational mode, the stored electrical energy is supplied to the first and second bidirectional hydraulic variable displacement pumps 11,13.
A load detector 43 is arranged for detecting a load factor of the first generator 15 and a control unit 35, communicatively coupled to the load detector 43, arranged for bringing the second generator 17 in the first operational mode or the second operational mode taking into account a load factor detected by the load detector 43. The system 1 furthermore comprises a third bidirectional hydraulic pump 19, a first bidirectional hydraulic motor 21 and a first tank 23. The hydraulic motor 21 is coupled in the first flow line 25, wherein the third bidirectional hydraulic pump 19 is arranged to be driven by the first bidirectional hydraulic motor 21 for supplying liquid from the tank 23 in a section of the first flow line 25 between the first bidirectional hydraulic motor 21 and the first bidirectional hydraulic variable displacement pump 11 and/or adding liquid to the tank 23 from the section of the first flow line 25. The third hydraulic pump 19 is controlled such that a flow rate of the liquid in the third flow line 39 and a flow rate of the liquid in the first flow line 25 are preferably equal.
The system 1 additionally comprises a fifth hydraulic pump 29 and a further tank 33. The fifth hydraulic pump 29 has a variable displacement. Upstream from the first bidirectional hydraulic motor 21, the fifth hydraulic pump 29 is coupled via a check valve 36 to an upstream section of the first flow line 25. Downstream from the first bidirectional hydraulic motor 21, the fifth hydraulic pump 29 is coupled via a further check valve 38 to a downstream section of the first flow line 25. The fifth hydraulic pump 29 is furthermore coupled via a yet further check valve 40 to the third flow line 39. The fifth hydraulic pump 29 is arranged for maintaining a pressure of the liquid in the first flow line 25 and the third flow line 39 within a predetermined range of 20 to 30 barg, by supplying liquid from the further tank 33 to the first flow line 25 and the third flow line 39. In an embodiment of the system 1, the first tank 23 and the further tank 33 may be one and the same tank. In other words the further tank 33 may be a part of the first tank 23.
Fig. 2 and Fig. 3 disclose elements of different embodiments of the system 1 according to the first aspect of the present disclosure as described above, in which Fig. 2 discloses the third bidirectional hydraulic pump 19 with a variable displacement and Fig.3 discloses the first bidirectional hydraulic motor 21 with a variable displacement.
Fig. 4 discloses elements of a yet further embodiment of system 1 according to the first aspect of the present disclosure, in which the first bidirectional hydraulic motor 21 is included in the third flow line 39, wherein the third bidirectional hydraulic pump 19 is arranged to be driven by the first bidirectional hydraulic motor 21 for supplying liquid from the tank 23 in a section of the third flow line 39 between the first bidirectional hydraulic motor 21 and the first bidirectional hydraulic variable displacement pump 11 and/or adding liquid to the tank 23 from the section of the third flow line 39, such that the flow rates in both flow lines 25, 39 are preferably equal. In this embodiment, the fifth hydraulic pump 29 is coupled via a check valve 36 to the first flow line 25. Upstream from the first bidirectional hydraulic motor 21, the fifth hydraulic pump 29 is coupled via a further check valve 38 to an upstream section of the third flow line 39. Downstream from the first bidirectional hydraulic motor 21, the fifth hydraulic pump 29 is coupled via a yet further check valve 40 to a downstream section of the third flow line 39.
The embodiments shown in Fig. 2, 3 and 4 described previously, can equivalently be applied to the part of system 1 comprising the second bidirectional hydraulic variable displacement pump 13, coupled via the second and fourth flow lines 31, 40 to the second differential hydraulic cylinders 7, 9.
Fig. 5 discloses elements of yet another system according to the first aspect of the present disclosure, wherein the system 1 comprises additional bidirectional hydraulic variable displacement pump 12, 14 and 16 for operating an additional set of differential hydraulic cylinders. The first and second generator 15, 17 are coupled to the bidirectional hydraulic variable displacement pumps 11, 12, 13, 14. When the second generator 17 is in a second operational mode, the second generator 17 is arranged for driving, together with the first generator 15, the bidirectional hydraulic variable displacement pump 11, 12, 13, 14. When the second generator 17 is in a third operational mode, the second generator 17 is driven by the one or more of the bidirectional hydraulic variable displacement pumps 11, 12, 13, 14 for generating electrical energy, which is stored storage unit 41. Fig. 6 discloses a forklift 101 comprising a moving a tool 105 and the system 1 according to the first aspect of the present disclosure for moving a tool 105 of the forklift and for recovering a part of the energy provided during lifting a load such as a container when lowering the load.

Claims (14)

CONCLUSIESCONCLUSIONS 1. Een systeem (1) omvattende hydraulische differentiaal cilinders (3, 5, 7, 9) voor het verplaatsen van een werktuig zoals een mast, lepel, bak of haak van een hydraulische machine zoals een graafmachine of een kraan, het systeem (1) omvattende - een eerste bidirectionele hydraulische pomp met variabele verplaatsing (11), gekoppeld voor vloeistofstroom, via een eerste stroomleiding (25) van het systeem (1}, naar één van een zuigerstangzijde (27) en een cilinderbasiszijde (37) van een eerste hydraulische differentiaal cilinder (3, 5) van de hydraulische differentiaal cilinders (3, 5, 7, 9) voor het bedienen van de eerste hydraulische differentiaal cilinder (3, 5); - een eerste generator (15) gekoppeld met de eerste bidirectionele hydraulische pomp met variabele verplaatsing (11, 13) voor het aansturen van de eerste bidirectionele hydraulische pomp met variabele verplaatsing (11, 13); - een tweede generator (17) gekoppeld met de eerste generator (15) en ingericht, wanneer de tweede generator (17) zich in een eerste operationele modus bevindt, om te worden aangedreven door de eerste generator (15) voor het opwekken van elektrische energie, en wanneer de tweede generator (17) zich in een tweede operationele modus bevindt, ingericht voor het, samen met de eerste generator (15), aansturen van de eerste bidirectionele hydraulische pomp met variabele verplaatsing (11, 13); - een derde bidirectionele hydraulische pomp (19), een eerste bidirectionele hydraulische motor (21) en een eerste reservoir (23), waarbij de eerste Dbidirectionele hydraulische pomp met variabele verplaatsing (11) is gekoppeld voor vloeistofstroom via de eerste stroomleiding (25) naar de ene van de zuigerstangzijde (27) en de cilinderbasiszijde (37) van de eerste differentiaal cilinder (3, 5) via de eerste bidirectionele hydraulische motor (21), waarbij de derde bidirectionele hydraulische pomp (19) is ingericht om te worden aangedreven door de eerste bidirectionele hydraulische motor (21) voor het toevoeren vanuit vloeistof uit het reservoir (23) naar de eerste stroomleiding (25) en/of het toevoegen van vloeistof aan het reservoir (23) vanuit de eerste stroomleiding (25); - een derde stroomleiding (39) welke de eerste bidirectionele hydraulische pomp met variabele verplaatsing (11) voor vloeistofstroom koppelt met de andere van de zuigerstangzijde (27) en de cilinderbasiszijde (37) van de eerste hydraulische differentiaal cilinder (3, 5), waarbij de derde hydraulische pomp (19) zodanig is bestuurd dat een verschil tussen een stroomsnelheid van de vloeistof in de derde stroomleiding (39) en een stroomsnelheid van de vloeistof in de eerste stroomleiding (25) binnen een vooraf bepaald bereik is, bij voorkeur waarbij de stroomsnelheden gelijk zijn.A system (1) comprising hydraulic differential cylinders (3, 5, 7, 9) for moving an implement such as a mast, spoon, bucket or hook of a hydraulic machine such as an excavator or a crane, the system (1 ) comprising - a first bidirectional variable displacement hydraulic pump (11), coupled for fluid flow, through a first flow line (25) of the system (1}, to one of a piston rod side (27) and a cylinder base side (37) of a first hydraulic differential cylinder (3, 5) of the hydraulic differential cylinders (3, 5, 7, 9) for operating the first hydraulic differential cylinder (3, 5): - a first generator (15) coupled to the first bidirectional hydraulic variable displacement pump (11, 13) for driving the first bidirectional variable displacement hydraulic pump (11, 13): - a second generator (17) coupled to the first generator (15) and arranged when the second one r (17) is in a first operational mode, to be driven by the first generator (15) for generating electrical energy, and when the second generator (17) is in a second operational mode, adapted to, together with the first generator (15), driving the first bidirectional variable displacement hydraulic pump (11, 13); - a third bidirectional hydraulic pump (19), a first bidirectional hydraulic motor (21) and a first reservoir (23), the first Dbidirectional variable displacement hydraulic pump (11) coupled for fluid flow through the first flow line (25) to one of the piston rod side (27) and the cylinder base side (37) of the first differential cylinder (3, 5) through the first bidirectional hydraulic motor (21), the third bidirectional hydraulic pump (19) being arranged to be driven by the first bidirectional hydraulic motor (21) for supplying fluid from the reservoir (23) to the first flow line (25) and/or adding fluid to the reservoir (23) from the first flow line (25); - a third flow line (39) coupling the first bidirectional variable displacement hydraulic pump (11) for fluid flow to the other from the piston rod side (27) and the cylinder base side (37) of the first hydraulic differential cylinder (3, 5), wherein the third hydraulic pump (19) is controlled such that a difference between a flow rate of the fluid in the third flow line (39) and a flow rate of the fluid in the first flow line (25) is within a predetermined range, preferably wherein the flow rates are equal. 2. Het systeem (1) volgens conclusie 1, waarbij het systeem (1) verder omvat: - een tweede bidirectionele hydraulische pomp met variabele verplaatsing (13) gekoppeld voor vloeistofstroom, via een tweede stroomleiding (31) van het systeem (1), naar één van een zuigerstangzijde en een cilinderbasiszijde van een tweede hydraulische differentiaal cilinder ( 7, 9) van de hydraulische differentiaal cilinders (3, 5, 7, 9) voor het bedienen van de tweede hydraulische differentiaal cilinder (7, 9); waarbij de eerste generator (15) verder is gekoppeld met de tweede bidirectionele hydraulische pomp met variabele verplaatsing (11, 13) voor het aansturen van de tweede bidirectionele hydraulische pomp met variabele verplaatsing (11, 13) en waarbij de tweede generator (17) is ingericht voor het, wanneer de tweede generator (17) zich in de tweede operationele modus bevindt, samen met de eerste generator (15), aansturen van de eerste en tweede bidirectionele hydraulische pompen met variabele verplaatsing (11, 13).The system (1) according to claim 1, wherein the system (1) further comprises: - a second bidirectional variable displacement hydraulic pump (13) coupled for fluid flow, via a second flow line (31) of the system (1), to one of a piston rod side and a cylinder base side of a second hydraulic differential cylinder (7, 9) of the hydraulic differential cylinders (3, 5, 7, 9) for operating the second hydraulic differential cylinder (7, 9); wherein the first generator (15) is further coupled to the second bidirectional variable displacement hydraulic pump (11,13) for driving the second bidirectional variable displacement hydraulic pump (11,13) and wherein the second generator (17) is arranged for, when the second generator (17) is in the second operational mode, together with the first generator (15), driving the first and second bi-directional variable displacement hydraulic pumps (11, 13). 3. Het systeem (1) volgens conclusie 1 of 2, waarbij de eerste en/of tweede bidirectionele hydraulische pompen met variabele verplaatsing (11, 13) zijn gekoppeld met de tweede generator (17) en waarbij de tweede generator (17) verder is ingericht, wanneer de tweede generator (17) zich in een derde operationele modus bevindt, om te worden aangedreven door de eerste en/of tweede bidirectionele hydraulische pompen met variabele verplaatsing (11, 13) voor het opwekken van elektrische energie.The system (1) according to claim 1 or 2, wherein the first and/or second bi-directional variable displacement hydraulic pumps (11, 13) are coupled to the second generator (17) and wherein the second generator (17) is further arranged, when the second generator (17) is in a third operational mode, to be driven by the first and/or second bidirectional variable displacement hydraulic pumps (11, 13) for generating electrical power. 4. Het systeem (1) volgens een van de voorgaande conclusies, waarbij één van de derde hydraulische pomp (19) en de eerste bidirectionele hydraulische motor (21) een variabele verplaatsing heeft.The system (1) according to any one of the preceding claims, wherein one of the third hydraulic pump (19) and the first bi-directional hydraulic motor (21) has a variable displacement. 5. Het systeem (1) volgens een van de voorgaande conclusies, waarbij de eerste bidirectionele hydraulische pomp met variabele verplaatsing (11) is gekoppeld voor vloeistofstroom, door de eerste stroomleiding (25), met de zuigerstangzijde (27) van de eerste hydraulische differentiaal cilinder (3, 5) via de eerste bidirectionele hydraulische motor (21).The system (1) according to any preceding claim, wherein the first bidirectional variable displacement hydraulic pump (11) is coupled for fluid flow, through the first flow line (25), to the piston rod side (27) of the first hydraulic differential cylinder (3, 5) via the first bidirectional hydraulic motor (21). 6. Het systeem (1) volgens een van de voorgaande conclusies, waarbij de derde hydraulische pomp (19) is ingericht voor het toevoeren van vloeistof vanuit het reservoir (23) in een sectie van de eerste stroomleiding (25) tussen de eerste bidirectionele hydraulische motor (21) en de eerste bidirectionele hydraulische pomp met variabele verplaatsing (11) en/of waarbij de derde hydraulische pomp (19) is ingericht voor het toevoegen van vloeistof aan het reservoir (23) vanuit de sectie van de eerste stroomleiding (25).The system (1) according to any one of the preceding claims, wherein the third hydraulic pump (19) is arranged to supply fluid from the reservoir (23) into a section of the first flow line (25) between the first bi-directional hydraulic motor (21) and the first bidirectional variable displacement hydraulic pump (11) and/or wherein the third hydraulic pump (19) is adapted to supply liquid to the reservoir (23) from the section of the first flow line (25) . 7. Het systeem (1) volgens een van de voorgaande conclusies, waarbij het systeem (1) verder een vijfde hydraulische pomp (29) omvat, waarbij de vijfde hydraulische pomp {29) is ingericht voor het handhaven van een druk van de vloeistof in de eerste stroomleiding (25) binnen een vooraf bepaald bereik, door het toevoeren van vloeistof vanuit het reservoir (23) of een verder reservoir (33) van het systeem (1) aan de eerste stroomleiding (25).The system (1) according to any one of the preceding claims, wherein the system (1) further comprises a fifth hydraulic pump (29), the fifth hydraulic pump {29) being adapted to maintain a pressure of the liquid in the first flow line (25) within a predetermined range, by supplying liquid from the reservoir (23) or a further reservoir (33) of the system (1) to the first flow line (25). 8. Het systeem (1) volgens conclusie 7, waarbij de vijfde hydraulische pomp (29) een variabele verplaatsing heeft.The system (1) according to claim 7, wherein the fifth hydraulic pump (29) has a variable displacement. 9. Het systeem (1) volgens conclusie 7 of 8, waarbij de vijfde hydraulische pomp (29) is ingericht voor het handhaven van een druk in de eerste stroomleiding (25) in een bereik van 20 tot 30 barg.The system (1) according to claim 7 or 8, wherein the fifth hydraulic pump (29) is arranged to maintain a pressure in the first flow line (25) in a range of 20 to 30 barg. 10. Het systeem (1) volgens een van de voorgaande conclusies, waarbij het systeem verder een belastingdetector (43) omvat voor het detecteren van een belastingfactor van de eerste generator (15) en een besturingseenheid (35), communicatief gekoppeld met de belastingdetector (43), waarbij de besturingseenheid (35) is ingericht om de tweede generator (17) in de eerste operationele modus of de tweede operationele modus te brengen, rekening houdend met een belastingfactor gedetecteerd door de belastingdetector (43).The system (1) according to any one of the preceding claims, wherein the system further comprises a load detector (43) for detecting a load factor of the first generator (15) and a control unit (35) communicatively coupled to the load detector ( 43), wherein the control unit (35) is arranged to bring the second generator (17) into the first operational mode or the second operational mode, taking into account a load factor detected by the load detector (43). 11. Het systeem (1) volgens een van de voorgaande conclusies, waarbij het systeem (1) verder een opslageenheid (41) omvat ingericht voor het opslaan van elektrische energie gegenereerd, wanneer deze zich in de eerste operationele modus bevindt, door de tweede generator (17) en het leveren van elektrische energie, wanneer de tweede generator (17) zich in de tweede operationele modus bevindt.The system (1) according to any one of the preceding claims, wherein the system (1) further comprises a storage unit (41) adapted to store electrical energy generated, when in the first operational mode, by the second generator (17) and supplying electrical energy when the second generator (17) is in the second operational mode. 12. Het systeem (1) volgens een van de voorgaande conclusies, waarbij de eerste generator een interne verbrandingsmotor omvat.The system (1) according to any one of the preceding claims, wherein the first generator comprises an internal combustion engine. 13. Een hydraulische machine (101) zoals een graafmachine, kraan, vorkheftruck of containerhandler, omvattende een systeem (1) volgens een van de voorgaande conclusies voor het verplaatsen van een werktuig van de hydraulische machine {101}.A hydraulic machine (101) such as an excavator, crane, forklift or container handler, comprising a system (1) according to any one of the preceding claims for moving a tool of the hydraulic machine {101}. 14. De hydraulische machine (101) volgens conclusie 13, omvattende een systeem (1) volgens conclusie 3 voor het terugwinnen van een gedeelte van de energie geleverd, door de eerste generator of geleverd door de eerste en tweede generator gezamenlijk, tijdens het heffen van een last zoals een container bij het neerlaten van de last.The hydraulic machine (101) according to claim 13, comprising a system (1) according to claim 3 for recovering a portion of the energy supplied, by the first generator or supplied by the first and second generators together, during lifting of a load such as a container when lowering the load.
NL2027457A 2021-01-29 2021-01-29 A system comprising differential hydraulic cylinders and a hydraulic machine comprising the system. NL2027457B1 (en)

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PCT/NL2022/050038 WO2022164315A1 (en) 2021-01-29 2022-01-26 A system comprising differential hydraulic cylinders and a hydraulic machine comprising the system
EP22702326.4A EP4284749A1 (en) 2021-01-29 2022-01-26 A system comprising differential hydraulic cylinders and a hydraulic machine comprising the system

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110308242A1 (en) * 2010-06-21 2011-12-22 Pfaff Joseph L Command based method for allocating fluid flow from a plurality of pumps to multiple hydraulic functions
EP2980324A1 (en) * 2013-03-26 2016-02-03 Doosan Infracore Co., Ltd. Hydraulic system for construction equipment
US9611619B1 (en) * 2015-10-22 2017-04-04 Cnh Industrial America Llc Hydraulic hybrid circuit with energy storage for excavators or other heavy equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110308242A1 (en) * 2010-06-21 2011-12-22 Pfaff Joseph L Command based method for allocating fluid flow from a plurality of pumps to multiple hydraulic functions
EP2980324A1 (en) * 2013-03-26 2016-02-03 Doosan Infracore Co., Ltd. Hydraulic system for construction equipment
US9611619B1 (en) * 2015-10-22 2017-04-04 Cnh Industrial America Llc Hydraulic hybrid circuit with energy storage for excavators or other heavy equipment

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