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US20090071139A1 - Excavator and a machine for material transfer - Google Patents

Excavator and a machine for material transfer Download PDF

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Publication number
US20090071139A1
US20090071139A1 US12/231,390 US23139008A US2009071139A1 US 20090071139 A1 US20090071139 A1 US 20090071139A1 US 23139008 A US23139008 A US 23139008A US 2009071139 A1 US2009071139 A1 US 2009071139A1
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US
United States
Prior art keywords
hydraulic
excavator
material transfer
machine
accordance
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.)
Abandoned
Application number
US12/231,390
Inventor
Dirk Asam
Rolf Mieger
Roland Wachter
Bernd Wager
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Hydraulikbagger GmbH
Original Assignee
Liebherr Hydraulikbagger GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebherr Hydraulikbagger GmbH filed Critical Liebherr Hydraulikbagger GmbH
Priority to US12/231,390 priority Critical patent/US20090071139A1/en
Publication of US20090071139A1 publication Critical patent/US20090071139A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • 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
    • 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
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load

Definitions

  • the invention relates to excavators and to machines for material transfer comprising an element movable via at least one hydraulic cylinder.
  • a boom and/or a shaft are moved e.g. via two parallel hydraulic cylinder pairs.
  • an attachment tool is then attached to the shaft and the good to be loaded is transferred with it.
  • Both the boom and the shaft and the attachment tools naturally have masses. This means that only a small part of the energy used for the lifting work benefits the lifting of the load. The much greater part must be used for the lifting of the equipment and of the attachment tool.
  • FIG. 1 A detail of an excavator and of machines for material transfer in accordance with the prior art is shown by way of example in FIG. 1 . It is an excavator in the present case.
  • a boom 12 is hinged to a rotating deck 10 of an excavator here and is movable via two hydraulic cylinder pairs 14 .
  • the hydraulic cylinder pairs are connected together, as can be seen from the hydraulic circuit diagram in accordance with FIG. 1 a.
  • This object is solved in accordance with the invention in that, in addition to the at least one hydraulic cylinder present for the movement of the movable elements, one or more additional hydraulic cylinders are hinged to the element to be moved, with the additional cylinder(s) being connected to one or more hydraulic accumulators of their own.
  • These additional hydraulic cylinders can be arranged parallel to the already present at least one hydraulic cylinder, but can also be attached at a different position.
  • the additional hydraulic cylinders do not engage in the hydraulic system, but are connected on the piston side with a hydraulic accumulator which can consist of a piston accumulator or a bladder accumulator.
  • the element to be moved can accordingly be a boom or a shaft of the excavator or of the machine for material transfer.
  • the additional hydraulic cylinder(s) can be arranged between two hydraulic cylinders which serve to move the element, i.e. the boom or the shaft.
  • the accumulator is loaded on the downward movement of the equipment.
  • the stored energy then in turn supports the upward movement of the equipment.
  • the equipment weight can hereby be compensated at least partly.
  • the same work is carried out via the, for example, three cylinders now present instead of the two previously present as was previously carried out by the two hydraulic cylinders connected in the hydraulic circuit.
  • the additional hydraulic cylinder(s) can be connectable to the main hydraulic circuit of the excavator or machine for material transfer via a switchable valve.
  • the third cylinder can thus be switched into the main hydraulic circuit via a valve so that the machine is not down and can carry out its work without a problem.
  • the number of additional hydraulic cylinders can advantageously be connected among one another.
  • the additional hydraulic cylinder of the shaft can thus be fed such that the shaft is supported on extension and vice versa.
  • the solution of the initially presented object in accordance with the invention results in a series of advantages:
  • the previously used main hydraulic cylinders can thus be dimensioned smaller. Less energy from the diesel engine is necessary overall for the lifting. Higher working speeds are possible.
  • the engine can theoretically have less power or, if it has a higher power, it can work in the part load range. Less energy has to be removed via the radiator overall.
  • the machine efficiency can be considerably increased. The fuel consumption can thus be lowered. This in turn results in a lowering of operating costs.
  • the bearing strains of the hydraulic cylinders can also be distributed onto six bearing positions instead of the usual four. Due to the provision of accumulator(s) of its/their own for the additional hydraulic cylinder(s), an active feeding into the main hydraulic circuit is not necessary. No complex hydraulic connections are thereby necessary.
  • FIG. 1 a detail view of a part of an excavator or of a machine for material transfer in accordance with the prior art
  • FIG. 2 a representation in accordance with FIG. 1 in accordance with an embodiment variant of the present invention (including the hydraulic circuit diagram);
  • FIG. 3 a schematic hydraulic circuit diagram of a variant of the embodiment in accordance with FIG. 2 .
  • FIG. 2 A detail of a hydraulic excavator is shown with reference to FIG. 2 by way of example for an excavator and machines for material transfer.
  • a boom 12 is pivotably hinged to a rotating deck 10 , with the pivoting up and down of the boom 12 taking place via hydraulic cylinders 14 .
  • an additional hydraulic cylinder 16 is arranged centrally. It can be seen from the hydraulic circuit diagram in accordance with FIG. 2 a that the hydraulic cylinders 14 are connected to one another in a similar manner to that already known from the prior art (cf. FIG. 1 a ).
  • an additional hydraulic cylinder 16 is provided whose piston side 18 is connected to a hydraulic accumulator 20 which can, for example, be a piston accumulator or a bladder accumulator.
  • the additional hydraulic cylinder 16 is independent of the hydraulic cylinders 14 .
  • the hydraulic cylinder 16 serves the purpose of the hydraulic fluid being displaced in the direction toward the hydraulic accumulator 20 by the piston 22 on a downward movement of the equipment.
  • the energy is stored here until the boom 12 should again be moved upwardly.
  • the energy stored in the accumulator 20 is released again by means of the additional hydraulic cylinder 16 so that a large part of the mass force of the boom and of the shaft or equipment suspended thereon is compensated and no longer has to be expended by the hydraulic cylinders 14 .

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

Abstract

The invention relates to an excavator or to a machine for material transfer comprising an element movable via at least one hydraulic cylinder. In accordance with the invention, one or more hydraulic cylinders are additionally hinged to the element, with the additional hydraulic cylinder(s) being connected to one or more hydraulic accumulators.

Description

    CROSS REFERENCE TO RELATED APPLICATION(S)
  • The present application is a continuation of co-pending U.S. application Ser. No. 11/175,753 filed Jul. 6, 2005.
    • BACKGROUND OF THE INVENTION
  • The invention relates to excavators and to machines for material transfer comprising an element movable via at least one hydraulic cylinder.
  • With excavators and machines for material transfer such as excavators, wheel-mounted loaders and similar plant, a boom and/or a shaft are moved e.g. via two parallel hydraulic cylinder pairs. In the case of an excavator, an attachment tool is then attached to the shaft and the good to be loaded is transferred with it. Both the boom and the shaft and the attachment tools naturally have masses. This means that only a small part of the energy used for the lifting work benefits the lifting of the load. The much greater part must be used for the lifting of the equipment and of the attachment tool.
  • A detail of an excavator and of machines for material transfer in accordance with the prior art is shown by way of example in FIG. 1. It is an excavator in the present case. A boom 12 is hinged to a rotating deck 10 of an excavator here and is movable via two hydraulic cylinder pairs 14. The hydraulic cylinder pairs are connected together, as can be seen from the hydraulic circuit diagram in accordance with FIG. 1 a.
  • Some first efforts have already been made to recover the energy expended in the lifting work of the equipment and of the attachment tool in an energy recovering system. For this purpose, it was attempted, for example in DE 102 56 442 A1 and DE 103 15 071 A1, to feed hydraulically stored energy into the main hydraulic circuit. However, this is only successful with limitations since the infeed pressure must always be larger than the system pressure in the main circuit.
    • SUMMARY OF THE INVENTION
  • It is therefore the object of the present invention to provide an excavator or a machine for material transfer in accordance with the element movable via at least one hydraulic cylinder in which a large part of the energy expended for the lifting of the equipment and of the attachment tool can, where possible, be stored for successive work cycles.
  • This object is solved in accordance with the invention in that, in addition to the at least one hydraulic cylinder present for the movement of the movable elements, one or more additional hydraulic cylinders are hinged to the element to be moved, with the additional cylinder(s) being connected to one or more hydraulic accumulators of their own. These additional hydraulic cylinders can be arranged parallel to the already present at least one hydraulic cylinder, but can also be attached at a different position. In accordance with the invention, the additional hydraulic cylinders do not engage in the hydraulic system, but are connected on the piston side with a hydraulic accumulator which can consist of a piston accumulator or a bladder accumulator.
  • Advantageous aspects of the present invention result from the description herein.
  • The element to be moved can accordingly be a boom or a shaft of the excavator or of the machine for material transfer.
  • The additional hydraulic cylinder(s) can be arranged between two hydraulic cylinders which serve to move the element, i.e. the boom or the shaft.
  • In accordance with the invention, the accumulator is loaded on the downward movement of the equipment. The stored energy then in turn supports the upward movement of the equipment. The equipment weight can hereby be compensated at least partly. The same work is carried out via the, for example, three cylinders now present instead of the two previously present as was previously carried out by the two hydraulic cylinders connected in the hydraulic circuit.
  • In accordance with a particularly advantageous embodiment of the invention, the additional hydraulic cylinder(s) can be connectable to the main hydraulic circuit of the excavator or machine for material transfer via a switchable valve. For example, for the case that the storage system breaks down, the third cylinder can thus be switched into the main hydraulic circuit via a valve so that the machine is not down and can carry out its work without a problem.
  • Furthermore, with a multi-element equipment and on the provision of more than one additional hydraulic cylinder, the number of additional hydraulic cylinders can advantageously be connected among one another. For example, on the downward movement of the boom, the additional hydraulic cylinder of the shaft can thus be fed such that the shaft is supported on extension and vice versa.
  • The solution of the initially presented object in accordance with the invention results in a series of advantages: The previously used main hydraulic cylinders can thus be dimensioned smaller. Less energy from the diesel engine is necessary overall for the lifting. Higher working speeds are possible. The engine can theoretically have less power or, if it has a higher power, it can work in the part load range. Less energy has to be removed via the radiator overall. The machine efficiency can be considerably increased. The fuel consumption can thus be lowered. This in turn results in a lowering of operating costs.
  • Moreover, the bearing strains of the hydraulic cylinders can also be distributed onto six bearing positions instead of the usual four. Due to the provision of accumulator(s) of its/their own for the additional hydraulic cylinder(s), an active feeding into the main hydraulic circuit is not necessary. No complex hydraulic connections are thereby necessary.
  • The processes of feeding energy into the additional hydraulic cylinder(s) are possible at any pressure level. No consideration has to be made of the pressure level of the main hydraulic circuit here. Finally, system redundancy is given by switching the additional hydraulic cylinder(s) over to the main hydraulic circuit.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Further features, details and advantages of the invention result from the embodiments shown in the drawing. There are shown:
  • FIG. 1: a detail view of a part of an excavator or of a machine for material transfer in accordance with the prior art;
  • FIG. 2: a representation in accordance with FIG. 1 in accordance with an embodiment variant of the present invention (including the hydraulic circuit diagram); and
  • FIG. 3: a schematic hydraulic circuit diagram of a variant of the embodiment in accordance with FIG. 2.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • A detail of a hydraulic excavator is shown with reference to FIG. 2 by way of example for an excavator and machines for material transfer. Here, a boom 12 is pivotably hinged to a rotating deck 10, with the pivoting up and down of the boom 12 taking place via hydraulic cylinders 14. In addition to the hydraulic cylinders 14, an additional hydraulic cylinder 16 is arranged centrally. It can be seen from the hydraulic circuit diagram in accordance with FIG. 2 a that the hydraulic cylinders 14 are connected to one another in a similar manner to that already known from the prior art (cf. FIG. 1 a). In addition to the hydraulic cylinders 14, an additional hydraulic cylinder 16 is provided whose piston side 18 is connected to a hydraulic accumulator 20 which can, for example, be a piston accumulator or a bladder accumulator.
  • As can be seen from the hydraulic circuit in accordance with FIG. 2 a, the additional hydraulic cylinder 16 is independent of the hydraulic cylinders 14. The hydraulic cylinder 16 serves the purpose of the hydraulic fluid being displaced in the direction toward the hydraulic accumulator 20 by the piston 22 on a downward movement of the equipment. The energy is stored here until the boom 12 should again be moved upwardly. Here, the energy stored in the accumulator 20 is released again by means of the additional hydraulic cylinder 16 so that a large part of the mass force of the boom and of the shaft or equipment suspended thereon is compensated and no longer has to be expended by the hydraulic cylinders 14.
  • In the hydraulic circuit diagram in accordance with FIG. 3, there is a basically similar embodiment variant as in the hydraulic circuit diagram in accordance with the embodiment variant of FIG. 2 a. Here, however, a selective connection with the main hydraulic circuit, via which the hydraulic cylinders 14 are supplied, is possible via corresponding switch valves 22 and 24 for the additional hydraulic cylinder 16, which is here likewise connected to a hydraulic accumulator 20. The additional hydraulic cylinder 16 can therefore be connected into the main hydraulic circuit depending on the position of the valves 22 and 24. This may, for example, be desired when the accumulator 20 is defective and when the hydraulic excavator should continue to work continuously despite this defect until it can be repaired.

Claims (6)

1-6. (canceled)
7. An excavator or a machine for material transfer, comprising
an element coupled to a member to be movable with respect to the member,
three hydraulic cylinders,
with two of said three hydraulic cylinders coupled to the element and member and connected together through a main hydraulic circuit to move the element with respect to the member,
said third hydraulic cylinder additionally hinged to the element and member independent from the main hydraulic circuit, and
one or more hydraulic accumulators connected to said third hydraulic cylinder.
8. An excavator or machine for material transfer in accordance with claim 7, wherein all said cylinders are arranged to pivot the element with respect to the member.
9. An excavator or machine for material transfer in accordance with claim 8, wherein said third hydraulic cylinder additionally hinged to the element and member is situated between said two other hydraulic cylinders.
10. An excavator or machine for material transfer in accordance with claim 7, wherein said third hydraulic cylinder additionally hinged to the element and member is situated between said two other hydraulic cylinders.
11. An excavator or a machine for material transfer in accordance with claim 1, wherein the element is a boom or shaft of the excavator or a machine for material transfer.
US12/231,390 2004-07-07 2008-09-02 Excavator and a machine for material transfer Abandoned US20090071139A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/231,390 US20090071139A1 (en) 2004-07-07 2008-09-02 Excavator and a machine for material transfer

Applications Claiming Priority (4)

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DE102004032868A DE102004032868A1 (en) 2004-07-07 2004-07-07 Excavator and machine for material handling
DE102004032868.4 2004-07-07
US11/175,753 US7434391B2 (en) 2004-07-07 2005-07-06 Excavator and a machine for material transfer
US12/231,390 US20090071139A1 (en) 2004-07-07 2008-09-02 Excavator and a machine for material transfer

Related Parent Applications (1)

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US11/175,753 Continuation US7434391B2 (en) 2004-07-07 2005-07-06 Excavator and a machine for material transfer

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014017958A1 (en) * 2012-07-26 2014-01-30 Volvo Construction Equipment Ab Balanced linkage
CN103650684A (en) * 2012-08-28 2014-03-26 迪尔公司 Implement with reduced hydraulic oil exchange
CN105421510A (en) * 2015-12-14 2016-03-23 福建工程学院 Movable arm energy-saving system adopting variable-diameter balanced hydraulic cylinder

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2113672B1 (en) * 2008-04-29 2010-12-22 Parker Hannifin AB Arrangement for operating a hydraulic device
DE102008034582A1 (en) 2008-07-24 2010-01-28 Liebherr-Hydraulikbagger Gmbh implement
DE202008013896U1 (en) 2008-10-17 2010-03-11 Liebherr-Hydraulikbagger Gmbh Mobile working device
EP2278167B1 (en) * 2009-07-23 2013-11-13 Q Plus Beheer B.V. Method for operating a pneumatic system and pneumatic system
DE102010032415A1 (en) * 2010-07-27 2012-02-02 Hydac Technology Gmbh Apparatus for recovering energy
DE102010051650A1 (en) * 2010-11-17 2012-05-24 Liebherr-Hydraulikbagger Gmbh implement
DE102011008145B3 (en) * 2011-01-08 2012-02-02 Parker Hannifin Gmbh Energy-efficient hydraulic drive for the linear movement of a mass body
JP5834132B2 (en) 2011-03-21 2015-12-16 楊双来 Jib lifting system and lifting method for work machine, and work machine
US8944103B2 (en) 2011-08-31 2015-02-03 Caterpillar Inc. Meterless hydraulic system having displacement control valve
US8966892B2 (en) 2011-08-31 2015-03-03 Caterpillar Inc. Meterless hydraulic system having restricted primary makeup
US8863509B2 (en) 2011-08-31 2014-10-21 Caterpillar Inc. Meterless hydraulic system having load-holding bypass
US8966891B2 (en) 2011-09-30 2015-03-03 Caterpillar Inc. Meterless hydraulic system having pump protection
US9151018B2 (en) * 2011-09-30 2015-10-06 Caterpillar Inc. Closed-loop hydraulic system having energy recovery
US9057389B2 (en) 2011-09-30 2015-06-16 Caterpillar Inc. Meterless hydraulic system having multi-actuator circuit
US9051714B2 (en) 2011-09-30 2015-06-09 Caterpillar Inc. Meterless hydraulic system having multi-actuator circuit
US8910474B2 (en) 2011-10-21 2014-12-16 Caterpillar Inc. Hydraulic system
US8893490B2 (en) 2011-10-21 2014-11-25 Caterpillar Inc. Hydraulic system
US8943819B2 (en) 2011-10-21 2015-02-03 Caterpillar Inc. Hydraulic system
US9068578B2 (en) 2011-10-21 2015-06-30 Caterpillar Inc. Hydraulic system having flow combining capabilities
US8978373B2 (en) 2011-10-21 2015-03-17 Caterpillar Inc. Meterless hydraulic system having flow sharing and combining functionality
US8919114B2 (en) 2011-10-21 2014-12-30 Caterpillar Inc. Closed-loop hydraulic system having priority-based sharing
US8984873B2 (en) 2011-10-21 2015-03-24 Caterpillar Inc. Meterless hydraulic system having flow sharing and combining functionality
US9080310B2 (en) 2011-10-21 2015-07-14 Caterpillar Inc. Closed-loop hydraulic system having regeneration configuration
US8973358B2 (en) 2011-10-21 2015-03-10 Caterpillar Inc. Closed-loop hydraulic system having force modulation
US8978374B2 (en) 2011-10-21 2015-03-17 Caterpillar Inc. Meterless hydraulic system having flow sharing and combining functionality
US9279236B2 (en) 2012-06-04 2016-03-08 Caterpillar Inc. Electro-hydraulic system for recovering and reusing potential energy
US9290912B2 (en) 2012-10-31 2016-03-22 Caterpillar Inc. Energy recovery system having integrated boom/swing circuits
US9290911B2 (en) 2013-02-19 2016-03-22 Caterpillar Inc. Energy recovery system for hydraulic machine
DE102013006204A1 (en) * 2013-04-04 2014-10-09 Sennebogen Maschinenfabrik Gmbh Actuator and implement with such an actuator
US9494168B2 (en) 2014-08-26 2016-11-15 Ut-Battelle, Llc Energy efficient fluid powered linear actuator with variable area and concentric chambers
US9441644B2 (en) 2014-08-26 2016-09-13 Ut-Battelle, Llc Energy efficient fluid powered linear actuator with variable area
DE102015009111A1 (en) * 2015-07-19 2017-01-19 Johannes Burde A device to support the hydraulic drives of a mobile work machine in its drive movement and force.
CN108055856B (en) * 2015-08-14 2020-12-25 派克汉尼芬公司 Boom potential energy recovery for hydraulic excavators
CN105839691A (en) * 2016-05-18 2016-08-10 山东常林机械集团股份有限公司 Electrically controlled hydraulic system for automatic switch of oil cylinders of movable arm of excavator
CN107829988A (en) * 2017-11-02 2018-03-23 中科聚信洁能热锻装备研发股份有限公司 A kind of hydraulic press backhaul without pump accumulator closed oil circuit and its control method
WO2021035477A1 (en) * 2019-08-26 2021-03-04 Guangxi Liugong Machinery Co., Ltd. Electric excavator
DE202022101057U1 (en) 2022-02-24 2022-03-08 Timur Serbay Hydraulic actuating device for a hydraulically operated implement
US11668072B1 (en) * 2022-10-26 2023-06-06 Bourgault Industries Ltd. Potential energy storage and control system for a hydraulically actuated element
WO2025022916A1 (en) * 2023-07-25 2025-01-30 イーグル工業株式会社 Fluid pressure circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6918247B1 (en) * 2003-11-19 2005-07-19 Jack E Warner Assisted hydraulic system for moving a structural member

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2238811B1 (en) * 1973-07-24 1976-11-12 Poclain Sa
JPS60250128A (en) * 1984-05-25 1985-12-10 Mitsubishi Heavy Ind Ltd Liquid pressure regenerative circuit
JPH0336333A (en) * 1989-06-30 1991-02-18 Komatsu Ltd Potential energy recovery reproducing device for hydraulically-operated excavator
JPH0826555B2 (en) * 1990-09-10 1996-03-13 株式会社小松製作所 Potential energy recovery and utilization device for work equipment
CZ279137B6 (en) * 1991-12-04 1995-01-18 František Ing. Krňávek Apparatus for recuperation of potential energy of a working device of a building or earth-moving machine
JP3129495B2 (en) * 1991-12-13 2001-01-29 株式会社小松製作所 Potential energy recovery device for lifting machine
JP3145032B2 (en) * 1996-05-21 2001-03-12 新キャタピラー三菱株式会社 Hydraulic cylinder vibration control device for work machine
SE9700297D0 (en) * 1997-01-31 1997-01-31 Lars Bruun Device for hydraulically operated work tools
GB2365407B (en) * 2000-05-25 2003-10-08 Bamford Excavators Ltd Hydraulic system for wheeled loader
US6655136B2 (en) 2001-12-21 2003-12-02 Caterpillar Inc System and method for accumulating hydraulic fluid
US6748738B2 (en) 2002-05-17 2004-06-15 Caterpillar Inc. Hydraulic regeneration system
JP3929380B2 (en) * 2002-09-26 2007-06-13 株式会社小松製作所 Position energy recovery / regeneration device for work equipment
JP2004116676A (en) * 2002-09-26 2004-04-15 Komatsu Ltd Work machine
JP2004125094A (en) * 2002-10-03 2004-04-22 Komatsu Ltd Hydraulic system of work vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6918247B1 (en) * 2003-11-19 2005-07-19 Jack E Warner Assisted hydraulic system for moving a structural member

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014017958A1 (en) * 2012-07-26 2014-01-30 Volvo Construction Equipment Ab Balanced linkage
CN103650684A (en) * 2012-08-28 2014-03-26 迪尔公司 Implement with reduced hydraulic oil exchange
CN105421510A (en) * 2015-12-14 2016-03-23 福建工程学院 Movable arm energy-saving system adopting variable-diameter balanced hydraulic cylinder

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US7434391B2 (en) 2008-10-14
EP1614814A2 (en) 2006-01-11
DE102004032868A1 (en) 2006-02-09
US20060053666A1 (en) 2006-03-16
EP1614814A3 (en) 2007-05-02

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