EP2118385B1 - Flüssigkeitssystem und betriebsverfahren dafür - Google Patents

Flüssigkeitssystem und betriebsverfahren dafür Download PDF

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Publication number
EP2118385B1
EP2118385B1 EP08726371A EP08726371A EP2118385B1 EP 2118385 B1 EP2118385 B1 EP 2118385B1 EP 08726371 A EP08726371 A EP 08726371A EP 08726371 A EP08726371 A EP 08726371A EP 2118385 B1 EP2118385 B1 EP 2118385B1
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EP
European Patent Office
Prior art keywords
valve arrangement
chamber
accumulator
fluid
cylinder
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.)
Not-in-force
Application number
EP08726371A
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English (en)
French (fr)
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EP2118385A1 (de
Inventor
Benjamin John Hanks
Andrew John Smith
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Caterpillar Inc
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Caterpillar Inc
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Filing date
Publication date
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Priority to EP08726371A priority Critical patent/EP2118385B1/de
Publication of EP2118385A1 publication Critical patent/EP2118385A1/de
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Publication of EP2118385B1 publication Critical patent/EP2118385B1/de
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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
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • 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
    • E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/021—Installations or systems with accumulators used for damping
    • 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
    • F15B21/008—Reduction of noise or vibration
    • 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
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations

Definitions

  • the disclosure relates to fluid systems and in particular to fluid systems providing selective fluid connection between one or more cylinder chambers and an accumulator.
  • two types of ride control systems are used for compensating shocks on the cylinders of load carrying machines, such as wheel loaders traveling with a loaded bucket. These shocks may be reduced by selectively connecting the load bearing cylinder to an accumulator.
  • the accumulator lay-out is optimized for a particular load.
  • Multi-setting ride control systems can be set to suit many load applications. This is done with multiple accumulators with varying volumes and pre-charges to give ride damping that is suitable for different load conditions, such as traveling with a full and empty bucket.
  • the multi-setting system is favorable in regard of operator comfort but requires additional components that take up additional space and increase the costs for such a system.
  • variable rate ride control system in which an accumulator arrangement is connected through a first valve mechanism to the loaded end of an actuator to provide a cushion or damping of the sudden changes in force.
  • the first valve mechanism controls the magnitude of the damping in response to the rate of flow between the actuator and the accumulator arrangement via an infinitely variable flow control mechanism.
  • a ride control system in which a control slide can hydraulically connect a rod end and a piston end of a cylinder to a hydraulic tank and an accumulator respectively for damping of pitching oscillations, and which can attach both cylinder ends to a hydraulic tank to provide a low-cost and space saving system with a "floating" function.
  • the document SU 805792 A shows a fluid system comprising at least one cylinder having a first chamber and a second chamber, the at least one cylinder being extended when the first chamber is pressurized and being retracted when the second chamber is pressurized.
  • the fluid system also comprises an accumulator, a low-pressure area and a valve arrangement fluidly connected to the first and second chambers, the accumulator and the low-pressure area.
  • the valve arrangement is configured to take four different positions. In a first position of the valve arrangement, both the first and second chamber are fluidly connected to the low-pressure area. In a second position, both the first and second chamber are fluidly connected to the accumulator. In a third position, the first chamber is fluidly connected to the low-pressure area and the second chamber is fluidly connected to the accumulator. In the fourth position, both the first and second chamber are fluidly disconnected from the accumulator and the low pressure area, respectively.
  • the disclosure aims to improve upon some or all of the disadvantages associated with the prior art.
  • a fluid system according to claim 1.
  • Said fluid system comprises at least one cylinder having a first chamber and a second chamber, an accumulator, and a first valve arrangement fluidly connected to the first and second chambers.
  • the at least one cylinder is extended when the first chamber is pressurized and retracted when the second chamber is pressurized.
  • the first valve arrangement is configured to in a first position fluidly connect the first chamber to both the accumulator and the second chamber.
  • the first valve arrangement is further configured to in a second position fluidly connect the first chamber to the accumulator and fluidly disconnect the second chamber from the accumulator.
  • the operating machine includes a work arm operated by at least one cylinder, having a first chamber and a second chamber, the at least one cylinder is extended when the first chamber is pressurized and retracted when the second chamber is pressurized, a first valve arrangement for selectively enabling a fluid flow between the cylinder and at least one of a low pressure area and an accumulator.
  • Said method comprises controlling the first valve arrangement so as to select a first position in which the first valve arrangement fluidly connects the first chamber of the cylinder to both the accumulator and the second chamber.
  • the method further comprises controlling the first valve arrangement to select a second position in which the first valve arrangement fluidly connects a first chamber of the cylinder to the accumulator and fluidly disconnects a second chamber of the cylinder from the accumulator.
  • a machine generally designated with numeral 10 having a work arm 12.
  • the machine 10 and the work arm 12 are represented in a simplified form, but it is to be understood that the machine 10 and work arm 12 may be of any suitable kind.
  • the machine 10 and the work arm 12 may for example be part of a construction machine such as a telehandler, a backhoe loader, a wheeled excavator, a skid steer loader or a wheeled loader.
  • At least one cylinder 14 may be configured to operate and hence raise and lower the work arm 12.
  • the at least one cylinder 14 may be one or more cylinders and may be part of a fluid system generally designated 16 of which an exemplary embodiment is shown in Fig. 2 .
  • the cylinder 14 may have a first chamber 18 and a second chamber 20 and may be provided with a piston 22 and a rod 24.
  • the cylinder 14 may operate in a conventional manner such that when the first chamber 18 is pressurized the cylinder 14 is extended and when the second chamber 20 is pressurized the cylinder 14 is retracted.
  • the cylinder 14 may also be arranged such that the head end of the cylinder 14 is attached to the work arm 12.
  • the first chamber 18 of the cylinder 14 may be fluidly connected to a first valve arrangement 26 via a first fluid line 28.
  • the second chamber 20 may be fluidly connected to the first valve arrangement 26 via a second fluid line 30.
  • the first chamber 18 may further be connected to a second valve arrangement 32 via a third fluid line 34.
  • the second chamber 20 may further be fluidly connected to a second valve arrangement 32 via a fourth fluid line 36.
  • the first and third fluid lines 28 and 34 may be partially combined into a single fluid line as shown in Fig. 2 , but they may also be run separately.
  • the second and fourth fluid lines 30 and 36 may be partially combined into a single fluid line as shown in Fig. 2 , but they may also be run separately.
  • the first valve arrangement 26 may further be fluidly connected to a low pressure region 38 via a fluid line 40.
  • the low pressure region 38 may be of any suitable type and may for example be a fluid reservoir.
  • the first valve arrangement 26 may further be connected to an accumulator 42 via a fluid line 44.
  • the accumulator 42 may be a conventional accumulator having a pre-charged and compressible gas chamber filled with a gas such as nitrogen.
  • the accumulator 42 may also be an arrangement of multiple accumulators.
  • the first valve arrangement 26 may include a single valve or a combination of valves.
  • the first valve arrangement 26 may be controlled in any suitable manner and may for example be biased to one position by springs 27 and actuated by actuators 29.
  • the actuators 29 may be solenoids.
  • the first valve arrangement 26 may be configured to assume a plurality of positions and may therefore be provided with first, second and third portions 26a, 26b and 26c representing first, second and third valve positions.
  • first position of the valve arrangement 26 By selecting a first position of the valve arrangement 26 and thereby using the first portion 26a, the first chamber 18 is fluidly connected to both the accumulator 42 and the second chamber 20.
  • the active portion of the valve arrangement 6 is portion 26b.
  • portion 26b the valve arrangement 26 in the second position fluidly connects the first chamber 18 to the accumulator 42. Simultaneously the second chamber 20 is fluidly disconnected from the accumulator 42.
  • the first valve arrangement 26 may be configured such that the second chamber 20 is fluidly connected to the low pressure region 38 when the first valve arrangement 26 is in the second position, but the first valve arrangement 26 may alternatively be configured to fluidly disconnect the second chamber 20 from the low pressure region 38.
  • the first and second chambers 18 and 20 are both disconnected from the accumulator 42.
  • the first and second chambers 18 and 20 may be either fluidly connected to one another or they may be fluidly disconnected from one another.
  • the second valve arrangement 32 may further be fluidly connected to a low pressure region 46 via a fluid line 48.
  • the low pressure region 46 may be of any suitable type and may for example be a fluid reservoir.
  • the low pressure region 46 may be fluidly connected to the low pressure region 38.
  • the second valve arrangement 32 may further be connected to a source of pressurized fluid 50 via a fluid line 52.
  • the source of pressurized fluid 50 may for example be a fluid pump.
  • the second valve arrangement 32 may be configured to pressurize at least one of the first and second chambers 18 and 20 of the cylinder 14 to, for example, raise and lower the work arm 12.
  • the second valve arrangement 32 may include a single valve or a combination of valves.
  • the second valve arrangement 32 may be controlled in any suitable manner and may for example be biased to one position by springs 31 and actuated by actuators 33.
  • the actuators 33 may be solenoids.
  • the second valve arrangement 32 may be configured to assume a plurality of positions and may therefore be provided with first, second and third portions 32a, 32b and 32c representing first, second and third valve positions.
  • the second valve arrangement 32 may be proportional such that the valve arrangement 32 can assume positions intermediate of the first, second and third valve positions.
  • the active portion of the valve arrangement 32 is portion 32a.
  • the valve arrangement 32 in the first position fluidly connects the first chamber 18 to the source of pressurized fluid 50.
  • the second chamber 20 may be fluidly connected to the low pressure region 46.
  • the second chamber 20 is fluidly connected to the source of pressurized fluid 50 whilst the first chamber 18 may be fluidly connected to the low pressure region 46.
  • the first and second chambers 18 and 20 may both be disconnected from both the source of pressurized fluid 50 and the low pressure region 46.
  • the machine 10 may be configured to prevent pressurization of at least one of the first and second chambers 18 and 20 via the second valve arrangement 32 when the first valve arrangement 26 is in the first position.
  • the machine 12 may include an electrical or electronic control arrangement 60 for controlling the first and second valve arrangements 26 and 32.
  • the control arrangement 60 may be configured to receive signals from input means 62 and 64 which may for example be operator controls such as a joystick or switch arrangements.
  • the control arrangement 60 may for example be an electronic control unit or a relay bases system that is configured to provide for an interlock between the actuators 29 and 33. If for example one of the actuators 27 is actuated, the control arrangement 60 may be configured to prevent any of the actuators 27 from being actuated.
  • the machine 10 may be configured to prevent at least one of the first and second chambers 18 and 20 to be fluidly connected with at least one of the low pressure region 38 or the accumulator 42 when the second valve arrangement 32 is in the first or the second position. This may again be achieved via the control arrangement 60 which can be configured to prevent or enable certain combinations of simultaneous actuation of any of the actuators 27 with any of the actuators 33.
  • the machine 10 may be configured to enable pressurization of at least one of the first and second chambers 18 and 20 via the second valve arrangement 32 when the first valve arrangement 26 is in the first position. This may for example be achieved by enabling the second valve arrangement 32 to assume an intermediate position between the first and the third position, i.e. intermediate of the portions 32a and 32c, such that the fluid line 52 is fluidly connected with the third fluid line 34, but that the fluid line 48 is not yet fluidly connected with the fourth fluid line 36.
  • the machine 10 may be configured to prevent pressurization of at least one of the first and second chambers 18 and 20 via the second valve arrangement 32 when the first valve arrangement 26 is in the second position. This may be achieved, for example, by the electrical or electronic control arrangement 60 described above.
  • the machine 10 may be configured to enable pressurization of at least one of the first and second chambers 18 and 20 via the second valve arrangement 32 when the first valve arrangement 26 is in the second position. This may for example be achieved by placing the second valve arrangement 32 in the first or second position.
  • the second valve arrangement 32 may be configured such that it is able to influence the fluid pressure in the accumulator 42 when the first valve arrangement 26 is in the first position.
  • the accumulator 42 is fluidly connected to both the first and second chambers 18 and 20.
  • the second valve arrangement may be placed such that pressurized fluid may flow from the source of pressurized fluid 50 to the accumulator 42.
  • the fluid pressure in the fluid accumulator 42 may therefore rise. This may for example be achieved by enabling the valve arrangement 32 to assume an intermediate position between the first and the third position, i.e.
  • the accumulator 42 is fluidly connected to both the first and second chambers 18 and 20.
  • the second valve arrangement 32 may be placed in a position such that fluid may flow from the accumulator 42 to the low pressure region 46. The fluid pressure in the fluid accumulator may therefore drop. This may for example be achieved by enabling the valve arrangement 32 to assume an intermediate position between the second and the third position, i.e. intermediate of the portions 32b and 32c, such that the fluid line 48 is fluidly connected with the third fluid line 34, but that the fluid line 52 is not yet fluidly connected with the fourth fluid line 36.
  • the second valve arrangement 32 may be configured such that it is able to influence the fluid pressure in the accumulator 42 when the first valve arrangement 26 is in the second position.
  • the accumulator 42 When the first valve arrangement 26 is in the second position, the accumulator 42 is fluidly connected to the first chamber 18 and fluidly disconnected from the second chamber 20.
  • the second valve arrangement 32 may be placed in its first position such that fluid may flow from the source of pressurized fluid 50 to the accumulator 42. The fluid pressure in the fluid accumulator may therefore rise.
  • the first valve arrangement 26 is in the second position, the accumulator 42 is fluidly connected to the first chamber 18 and fluidly disconnected from the second chamber 20.
  • the second valve arrangement 32 may be placed in its second position such that fluid may flow from the accumulator 42 to the low pressure region 46. The fluid pressure in the fluid accumulator may therefore drop.
  • the fluid system 16 and the machine 10 may function as follows.
  • the machine 10 may be used in a common operation such as for example a combined dig and transport cycle, wherein the machine uses a tool mounted on the work arm 12 to dig into a substance, load the tool and transport it to another place.
  • One situation may for example include controlling the first valve arrangement 26 such that it is in its third position and neither of the first and second chambers 18 and 20 are fluidly connected to the accumulator 42 nor connected to one another.
  • Controlling the second valve arrangement 32 such that the second valve arrangement assumes its first or second position selectively enables a fluid flow between the cylinder 14 and the source of pressurized fluid 50, and between the cylinder 14 and the low pressure region 46. This may then result in the cylinder 14 extending or retracting and hence the work arm 12 being raised or lowered.
  • the operation may involve controlling the first valve arrangement 26 so as to select the second position of the first valve arrangement 26 in which the valve arrangement fluidly connects the first chamber 18 with the accumulator 42 and fluidly disconnects the second chamber 20 from the accumulator 42.
  • the second valve arrangement 32 is in its third position such that the fluid lines 34 and 36 are not fluidly connected with the source of pressurized fluid 50 nor the low pressure region 46, the load on the cylinder 24 from the work arm 12, and any payload it may carry, is at least partially supported by the accumulator 42.
  • This is a selection that may be chosen when the machine 10 is in, for example, a transport condition. During transport the machine may encounter uneven terrain that may induce a front-aft rocking motion.
  • a limited flow of fluid can take place between the first chamber 18 and the accumulator due to the accumulator allowing the gaseous pre-charge being compressed. This may for example be the case when the work arm 12 is accelerated in a downwards fashion during a transport operation whereby for example the machine 12 encounters an obstacle. Fluid expelled from the first chamber 18 by the piston 22 may in that case flow to the accumulator 42.
  • the operation may involve controlling the first valve arrangement 26 so as to select the first position in which the first valve arrangement 26 fluidly connects the first chamber 18 of the cylinder 14 with both the accumulator 42 and the second chamber 20.
  • the second valve arrangement 32 is in its third position such that the fluid lines 34 and 36 are not fluidly connected with the source of pressurized fluid 50 nor the low pressure region 46 the load on the cylinder 24 from the work arm 12 and any payload it may carry is at least partially supported by the accumulator 42.
  • This is a selection that may be chosen when the machine 10 is in, for example, a transport condition to reduce the effect of the fore-aft rocking motion.
  • the behavioral characteristics of the fluid system 16 and the machine 12 may differ, depending whether the first valve arrangement 26 is in the first position or the second position.
  • first valve arrangement 26 is in the first position or the second position.
  • the second valve arrangement 32 in its second position and the first valve arrangement 26 in its second position such that the first chamber 18 is not fluidly connected with the second chamber 20 all fluid that is being displaced from the first chamber 18 will flow towards the accumulator 42.
  • Pressure in the accumulator 42 may rise relatively fast in relation to the quantity of fluid displaced from the first chamber 26, hence the resistance to the flow of fluid from the first chamber 18 to accumulator will increase relatively fast.
  • the damping provided may therefore feel relatively stiff to the operator as movement of the work arm 12 may be damped over a relatively short range of work arm movement.
  • the second valve arrangement 32 With the second valve arrangement 32 in its second position and the first valve arrangement 26 in its first position such that the first chamber 18 is fluidly connected with the second chamber 20, a portion of the fluid that is being displaced from the first chamber 18 may flow towards the accumulator 42, but another portion may flow towards the second chamber 20.
  • the second chamber 20 which has a smaller fluid capacity than the first chamber 18 due to the presence of the cylinder rod 24, can take in a portion of the fluid displaced by the first chamber 18, but not the full quantity of displaced fluid. The excess displaced fluid from the first chamber 18 which is not taken in by the second chamber 20 can flow towards the accumulator 42.
  • Pressure in the accumulator 42 may therefore rise relatively slowly in relation to the quantity of fluid displaced from the first chamber 18 as compared to the first and second chambers 18 and 20 not being fluidly connected, because not all fluid displaced from the first chamber 18 flows towards the accumulator 42.
  • the damping provided may feel relatively soft to the operator as movement of the work arm 12 may be damped over a relatively large range of work arm movement.
  • the machine 10 may be set up to include preventing the work arm 12 from being raised or lowered when either the first or second position of the first valve arrangement 26 is selected. This may be used if it is desirable to relatively accurately predict the behavior of the work arm during operation.
  • the machine 10 may be set up to include preventing the first valve arrangement from being in the first or second position when the work arm 12 is being raised or lowered. This may be used if it is desirable to relatively accurately predict the behavior of the work arm during operation.
  • the machine 10 may be set up to include controlling the second valve arrangement so as to influence the fluid pressure in the accumulator when the first valve arrangement is in the first or second position.
  • controlling the second valve arrangement so as to influence the fluid pressure in the accumulator when the first valve arrangement is in the first or second position.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)
  • External Artificial Organs (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Claims (14)

  1. Fluidsystem (16) mit:
    - mindestens einem Zylinder (14) mit einer ersten Kammer (18) und einer zweiten Kammer (20), wobei der mindestens eine Zylinder (14) ausgefahren wird, wenn die erste Kammer (18) mit Druck beaufschlagt wird, und eingefahren wird, wenn die zweite Kammer (20) mit Druck beaufschlagt wird;
    - einem Akkumulator (42);
    - einer ersten Ventilanordnung (26), die fluidmäßig mit der ersten und zweiten Kammer (18, 20) in Verbindung steht;
    - wobei die erste Ventilanordnung (26) dazu ausgebildet ist, in einer ersten Position die erste Kammer (18) fluidmäßig mit sowohl dem Akkumulator (42) als auch der zweiten Kammer (20) zu verbinden und in einer zweiten Position die erste Kammer (18) fluidmäßig mit dem Akkumulator (42) zu verbinden und die zweite Kammer (20) fluidmäßig von dem Akkumulator (42) zu trennen.
  2. Fluidsystem (16) nach Anspruch 1, bei dem die erste Ventilanordnung (26) ferner dazu ausgebildet ist, in einer dritten Position sowohl die erste als auch die zweite Kammer (18, 20) fluidmäßig von dem Akkumulator (42) zu trennen.
  3. Fluidsystem (16) nach einem der vorhergehenden Ansprüche, wobei das Fluidsystem (16) ferner einen Niederdruckbereich (38) beinhaltet und die erste Ventilanordnung (26) dazu ausgebildet ist, die zweite Kammer (20) fluidmäßig mit dem Niederdruckbereich (38) zu verbinden, wenn sich die erste Ventilanordnung (26) in der zweiten Position befindet.
  4. Fluidsystem (16) nach Anspruch 1 bis 2. wobei das Fluidsystem (16) ferner einen Niederdruckbereich (38) beinhaltet und die erste Ventilanordnung (26) dazu ausgebildet ist, die zweite Kammer (20) fluidmäßig von dem Niederdruckbereich (38) zu trennen, wenn sich die erste Ventilanordnung (26) in der zweiten Position befindet.
  5. Maschine (10) mit einem Fluidsystem (16) nach einem der vorhergehenden Ansprüche.
  6. Maschine (10) nach Anspruch 5, bei der der mindestens eine Zylinder (14) dazu ausgebildet ist, einen Lastarm (12) der Maschine (10) zu heben und zu senken, wobei das Fluidsystem (16) ferner eine zweite Ventilanordnung (32) enthält, die dazu ausgebildet ist, zum Heben oder Senken des Lastarms (12) die erste und/oder die zweite Kammer (18, 20) mit Druck zu beaufschlagen.
  7. Maschine (10) nach Anspruch 6, bei der die erste und die zweite Ventilanordnung (26, 32) so ausgebildet sind, dass die Druckbeaufschlagung der ersten und/oder der zweiten Kammer (18, 20) mittels der zweiten Ventilanordnung (32) entweder verhindert oder ermöglicht wird, wenn sich die erste Ventilanordnung (26) in der ersten Position befindet.
  8. Maschine (10) nach Anspruch 6 oder 7, wobei die erste und die zweite Ventilanordnung (26, 32) so ausgebildet sind, dass die Druckbeaufschlagung der ersten und/oder der zweiten Kammer (18, 20) mittels der zweiten Ventilanordnung (32) entweder verhindert oder ermöglicht wird, wenn sich die die erste Ventilanordnung (26) in der zweiten Position befindet.
  9. Maschine (10) nach einem der Ansprüche 6 bis 8, bei der die zweite Ventilanordnung (32) so ausgebildet ist, dass der Fluiddruck in dem Akkumulator (42) beeinflusst wird, wenn sich die erste Ventilanordnung (26) in der ersten oder der zweiten Position befindet.
  10. Verfahren zum Betreiben einer Maschine (10),
    wobei die Maschine (10) einen Lastarm (12), der durch mindestens einen Zylinder (14), der eine erste Kammer (18) und eine zweite Kammer (20) aufweist, betätigt wird, wobei der mindestens eine Zylinder (14) ausgefahren wird, wenn die erste Kammer (18) mit Druck beaufschlagt wird, und eingefahren wird, wenn die zweite Kammer (20) mit Druck beaufschlagt wird, und eine erste Ventilanordnung (26) zum selektiven Ermöglichen eines Fluidstroms zwischen dem mindestens einen Zylinder (14) und einem Niederdruckbereich (38) und/oder einem Akkumulator (42) enthält,
    wobei das Verfahren beinhaltet:
    Steuern der ersten Ventilanordnung (26) zum Auswählen einer ersten Position, in der die erste Ventilanordnung (26) die erste Kammer (18) des Zylinders (14) fluidmäßig mit sowohl dem Akkumulator (42) als auch der zweiten Kammer (20) verbindet; und
    Steuern der ersten Ventilanordnung (26) zum Auswählen einer zweiten Position, in der die erste Ventilanordnung (26) die erste Kammer (18) des Zylinders (14) fluidmäßig mit dem Akkumulator (42) verbindet und die zweite Kammer (20) des Zylinders (14) fluidmäßig von dem Akkumulator (42) trennt.
  11. Verfahren nach Anspruch 10, ferner beinhaltend das Steuern der ersten Ventilanordnung (26) zum Auswählen einer dritten Position, in der die erste Ventilanordnung (26) die erste Kammer (18) des Zylinders (14) fluidmäßig sowohl von dem Akkumulator (42) als auch von der zweiten Kammer (20) des Zylinders (14) trennt.
  12. Verfahren nach einem der Ansprüche 10 bis 11, bei dem die Maschine (10) ferner eine zweite Ventilanordnung (32) enthält, wobei das Verfahren ferner das Steuern der zweiten Ventilanordnung (32) zum selektiven Ermöglichen eines Fluidstroms zwischen dem mindestens einen Zylinder (14) und einem Niederdruckbereich (46) und/oder einer Quelle von mit Druck beaufschlagtem Fluid (50) zum Heben oder Senken des Lastarms (12) beinhaltet.
  13. Verfahren nach Anspruch 12, ferner beinhaltend das Verhindern eines Hebens oder Senkens des Lastarms (12), wenn die erste Position der ersten Ventilanordnung (26) oder die zweite Position der ersten Ventilanordnung (26) ausgewählt ist.
  14. Verfahren nach einem der Ansprüche 10 bis 12, ferner beinhaltend das Steuern der zweiten Ventilanordnung (32) zum Beeinflussen des Fluiddrucks in dem Akkumulator (42), wenn sich die erste Ventilanordnung (26) in der ersten oder der zweiten Position befindet.
EP08726371A 2007-03-01 2008-03-03 Flüssigkeitssystem und betriebsverfahren dafür Not-in-force EP2118385B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08726371A EP2118385B1 (de) 2007-03-01 2008-03-03 Flüssigkeitssystem und betriebsverfahren dafür

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07103359A EP1964982A1 (de) 2007-03-01 2007-03-01 Druckflüssigkeitssystem und Verfahren zur dessen Benutzung.
EP08726371A EP2118385B1 (de) 2007-03-01 2008-03-03 Flüssigkeitssystem und betriebsverfahren dafür
PCT/US2008/002817 WO2008106233A1 (en) 2007-03-01 2008-03-03 Fluid system and method of operating thereof

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EP2118385A1 EP2118385A1 (de) 2009-11-18
EP2118385B1 true EP2118385B1 (de) 2011-02-16

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EP07103359A Withdrawn EP1964982A1 (de) 2007-03-01 2007-03-01 Druckflüssigkeitssystem und Verfahren zur dessen Benutzung.
EP08726371A Not-in-force EP2118385B1 (de) 2007-03-01 2008-03-03 Flüssigkeitssystem und betriebsverfahren dafür

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AT (1) ATE498744T1 (de)
DE (1) DE602008004993D1 (de)
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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53113104A (en) * 1977-03-14 1978-10-03 Hitachi Construction Machinery Boom turning hydraulic circuit
SU804792A1 (ru) * 1978-08-07 1981-02-15 Сибирский Автомобильно-Дорожный Институт Им.B.B.Куйбышева Министерствавысшего И Среднего Специальногообразования Рсфср Гидравлический привод рабочегоОбОРудОВАНи зЕМлЕРОйНОй МАшиНы
DE4416228A1 (de) * 1994-05-07 1995-11-09 Rexroth Mannesmann Gmbh Hydraulische Anlage für ein mobiles Arbeitsgerät, insbesondere für einen Radlader
DE19913784A1 (de) * 1999-03-26 2000-09-28 Mannesmann Rexroth Ag Lastfühlende hydraulische Steueranordnung für eine mobile Arbeitsmaschine
US6634653B2 (en) * 2001-07-17 2003-10-21 Probir Chatterjea & Associates, Inc. Ride control system for construction equipment
JP3929380B2 (ja) * 2002-09-26 2007-06-13 株式会社小松製作所 作業機の位置エネルギ回収・再生装置
US6789387B2 (en) * 2002-10-01 2004-09-14 Caterpillar Inc System for recovering energy in hydraulic circuit

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EP1964982A1 (de) 2008-09-03
ATE498744T1 (de) 2011-03-15
DE602008004993D1 (de) 2011-03-31
EP2118385A1 (de) 2009-11-18
WO2008106233A1 (en) 2008-09-04

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