EP1872017A1 - Assistance de levage hydraulique pour appareils de terrassement remorques - Google Patents

Assistance de levage hydraulique pour appareils de terrassement remorques

Info

Publication number
EP1872017A1
EP1872017A1 EP06738394A EP06738394A EP1872017A1 EP 1872017 A1 EP1872017 A1 EP 1872017A1 EP 06738394 A EP06738394 A EP 06738394A EP 06738394 A EP06738394 A EP 06738394A EP 1872017 A1 EP1872017 A1 EP 1872017A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
load
sensor
sensing
lift
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.)
Withdrawn
Application number
EP06738394A
Other languages
German (de)
English (en)
Inventor
Mark R. Miskin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1872017A1 publication Critical patent/EP1872017A1/fr
Withdrawn legal-status Critical Current

Links

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
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/64—Buckets cars, i.e. having scraper bowls
    • E02F3/6454—Towed (i.e. pulled or pushed) scrapers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/64—Buckets cars, i.e. having scraper bowls
    • E02F3/6454—Towed (i.e. pulled or pushed) scrapers
    • E02F3/6481—Towed (i.e. pulled or pushed) scrapers with scraper bowls with an ejector having translational movement for dumping the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/64—Buckets cars, i.e. having scraper bowls
    • E02F3/65—Component parts, e.g. drives, control devices
    • E02F3/651—Hydraulic or pneumatic drives; Electric or electro-mechanical control devices
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/64—Buckets cars, i.e. having scraper bowls
    • E02F3/65—Component parts, e.g. drives, control devices
    • E02F3/652—Means to adjust the height of the scraper bowls, e.g. suspension means, tilt control, earth damping control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being 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
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3138—Directional control characterised by the positions of the valve element the positions being discrete
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/324—Directional control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration

Definitions

  • the present invention relates generally to hydraulic systems for lifting a load. More specifically, the present invention relates to hydraulic systems that allow the selection of a secondary source of hydraulic power to lift a load.
  • a tractor may use its internal combustion engine to not only provide locomotion, but to also operate a high pressure hydraulic pump. While the tractor engine is typically able to provide sufficient horsepower for all needs, there may arise situations where the tractor engine is under powered.
  • One example might include a tractor being used to pull an earth moving apparatus. As the tractor pulls the earth moving apparatus, it fills with earth thereby increasing the resistance to the tractor pull. In order to compensate for this increased resistance, the operator of the tractor may gradually lift the frame of the earth moving apparatus, and, thereby the cutting blade, as the apparatus fills with earth. This lifting of the cutting blade, using the tractor's hydraulic system, decreases the resistance to the tractor's pull as the blade cuts less deeply into the earth. However, because the earthmoving apparatus' hydraulic system is powered by the tractor's engine, the horsepower of the engine must now be split between the simultaneous pulling of the earth moving apparatus and the lifting of the cutting blade. If the tractor is in a heavy pull, operating the hydraulics to lift the cutting blade may put enough extra drag on the engine to cause it to stall.
  • Representative examples include, without limitation, the hydraulic systems disclosed in U.S. Patents 5,313,795, 5,090,495, 3,965,587, 4,360,187, 5,037,368, 5,516,070, 5,806,838, 3,945,685, and 3,945,691, the disclosures of each which are hereby incorporated by reference.
  • These systems typically use a hydraulic accumulator to store hydraulic pressure to be used in the absence or failure of another power source.
  • Systems of this type are typically constantly engaged to the active hydraulic system with the accumulator being 'inline' between the sources of pressurized hydraulic fluid and the ultimate use.
  • Such systems can be said to be 'constantly engaged' as the operator of the system has no means of selecting when the pressure stored in the accumulator is not to be used, i.e. no means of disconnecting the accumulator from the hydraulic system.
  • the constant engagement of such systems do not allow the operator or designer of the hydraulic system to select whether the primary source of pressurized hydraulic fluid or the reserve hydraulic pressure in the accumulator is to be used for a given purpose.
  • the reserve pressure is always available regardless of the operator's wishes.
  • the hydraulic systems typical of earth moving machinery are designed so as to not be under significant pressure unless they are being used.
  • a 'constantly engaged' accumulator would provide hydraulic pressure to the system every time the primary source is not in use, even when the operator desires that there be relatively little hydraulic pressure in the system.
  • accumulator systems that engage when a certain back pressure has been reached are also known.
  • a representative example includes, without limitation, the hydraulic system disclosed in U.S. Patent 2,846,187, the disclosure of which is hereby incorporated by reference.
  • the hydraulic pressure in an accumulator is released into a hydraulic system when the pressure in the hydraulic system rises to a predetermined level.
  • Such systems increase the hydraulic flow, allowing the hydraulic system to actuate more quickly, but would be of little use where the primary source of hydraulic power is unable to provide that predetermined hydraulic pressure. Further, such systems do not allow the operator or designer of the hydraulic system to select whether the primary source of pressurized hydraulic fluid or the reserve hydraulic pressure in the accumulator is used.
  • the present invention includes hydraulic systems designed to allow the selection of a source of pressurized hydraulic fluid to lift a load.
  • a hydraulic system in accordance with the present invention comprises a hydraulic accumulator that may be selected as a source of pressurized hydraulic fluid to lift a load.
  • Such a hydraulic system may or may not be part of a cushion ride system.
  • the present invention also includes methods for selecting a source of pressurized hydraulic fluid to lift a load.
  • a source of pressurized hydraulic fluid is used to charge an accumulator. The hydraulic pressure in the accumulator is then used to lift the load when selected to do so.
  • a further illustrative embodiment of the present invention includes a hydraulic system comprising a hydraulic accumulator that may be selected as a source of pressurized hydraulic fluid to lift a load into earth moving or ground leveling apparatus.
  • the load lifted in the earth moving apparatus may be the earth moving or ground leveling apparatus frame, wheels, apron, cutting blade or other portion of the earth moving or ground leveling apparatus or its cargo.
  • Such a hydraulic system may or may not be part of a cushion ride system incorporated into the earth moving or ground leveling apparatus.
  • FIG. 1 is a schematic diagram of an illustrative embodiment of a hydraulic system for selectively regulating the flow of a hydraulic fluid into and out of a hydraulic accumulator.
  • FIG. 2 is a schematic diagram of a second illustrative embodiment of a hydraulic system for selectively regulating the flow of hydraulic fluid between a source of pressurized hydraulic fluid, a hydraulic accumulator, a hydraulic cylinder, and a cushion ride system.
  • FIG. 3 illustrates a further embodiment of an earth moving apparatus on to which the hydraulic system of the present invention may be incorporated.
  • the hydraulic system 100 comprises a source of pressurized hydraulic fluid generally at 102.
  • the source of pressurized hydraulic fluid generally at 102 includes, as illustrated, a hydraulic pump 104, a reservoir of hydraulic fluid 106, a selector valve 108, and an engine 109 for driving hydraulic pump 104.
  • a non- limiting example of a source of pressurized hydraulic fluid generally at 102 would be the engine and high pressure hydraulic system present on a prime mover. Examples of prime movers include, but are not limited to, tractors, tracks, and various other self-propelled vehicles.
  • Hydraulic system 100 further comprises hydraulic lines HOa and HOb, which may be used to carry hydraulic fluid to and from hydraulic cylinders 112a and 112b.
  • Branching from hydraulic line HOa is a lift assist system generally at 114.
  • the lift assist system generally at 114 includes an accumulator 116, a check valve 118, a valve 120, and a check valve 122.
  • the directional force of the load on hydraulic cylinder 112a is as indicated by arrow 124.
  • the hydraulic system 100 may also be used to operate multiple hydraulic cylinders which can be single or double acting.
  • additional cylinders may include, for example, but are not limited to, cylinders for raising or lowering a scraper bucket, opening or closing a scraper apron, operating a load ejector, operating a brake system, or providing pilot pressure for other hydraulic valves.
  • These other operative hydraulic systems are as illustrated and disclosed in 4,383,380, 4,388,769, 4,398,363, 4,553,608, and 6,347,670 to Miskin which are incorporated herein by reference.
  • valve 120 During normal operation, valve 120 remains closed. As hydraulic cylinders 112a and 112b are actuated during normal operation, hydraulic oil under pressure will pass through check valve 118 to be stored in accumulator 116. If the operator desires, or if a certain predetermined condition or conditions are sensed, valve 120 may be caused to open allowing the stored hydraulic oil under pressured to pass through valve 120 and check valve 122 and into hydraulic line 110a. If the stored hydraulic pressure in accumulator 116 is sufficient, hydraulic cylinders 112a and
  • valve 120 may comprise an electrically-controlled, solenoid-type valve that may be controlled by a control switch (not shown) that may be located in the cab of the prime mover used to pull the apparatus to which hydraulic system 100 is mounted, or, if the apparatus on which hydraulic system 100 is self-propelled, the control switch (not shown) may be located in the control area of the self-propelled apparatus.
  • valve 120 may be any type of hydraulic valve and controlled in any manner known in the art, such as by mechanical systems and the like.
  • Types of control systems that may be used to control valve 120 of the present invention include, without limitation, pressure controlled systems, pneumatic systems, vacuum systems, electronically controlled systems, automatically controlled systems, manually controlled systems, remote control systems, and mechanically linked systems.
  • a load comprises the force of gravity acting on a particular mass so as to drive the actuation of a piston rod of a hydraulic cylinder.
  • the load may be the weight of the frame of an earth moving apparatus.
  • the lifting of a load comprises the actuation of a hydraulic cylinder causing a load to move against the force of gravity.
  • the hydraulic system 200 includes a cushion ride system generally at 210 in place of check valve 118.
  • the cushion ride system utilizes the accumulator 116 as a shock absorber when the hydraulic system 200 is mounted on a vehicle such as an earth moving or ground leveling apparatus. Examples of using an accumulator as a shock absorber can be found in U.S. Patents 6,382,326 and 6,749,035, both of which are incorporated herein by reference.
  • cushion ride system generally at 210 may comprise check valves 212 and 214, valves 216 and 220, and restrictor 218. Also depicted is valve 222.
  • valve 222 During normal operation, valve 222 remains open. However, if it desired to charge accumulator 116 without actuating hydraulic cylinders 112a and 112b, valve 222 may be closed, thereby diverting the flow of pressurized hydraulic away from hydraulic cylinders 112a and 112b.
  • Hydraulic system 200 further includes sensor 224 for sensing the flow of hydraulic fluid in hydraulic line HOa. As shown, sensor 224 may be operatively connected to valves 120 and 220 so as to control the position of valves 120 and 220 in response to predetermined sensor inputs. It will be appreciated by one of skill in the art that the position and type of sensor 224 described is merely exemplary and that any number of sensors inputs may be used to determine when valves 120 and 220 are opened.
  • Such sensors or inputs include, but are not limited to, operator decision, a system for sensing a failure of movement of hydraulic cylinders 112a and 112b when selector valve 108 is actuated so as to lift the load, a speed sensor for sensing the speed of the prime mover, a system for sensing the engine speed of a prime mover, a system for sensing which gear the transmission of the prime mover is currently in, or a system for sensing a lack of hydraulic fluid flow in hydraulic line 110a when selector valve 108 is actuated so as to lift the load.
  • valves 120 and 220 are opened and valve 222 closed so that hydraulic fluid under pressure from the source of pressurized hydraulic fluid generally at 102 can pass through valves 216 and 220 as well as check valve 212 and/or restrictor 218 to be stored in accumulator 116.
  • valves 120 and 220 are closed and valve 222 is opened. If, at any time, the stored pressurized hydraulic fluid in accumulator 116 is selected to actuate hydraulic cylinders 112a and 112b, valves 120 and 220 will be opened and the hydraulic fluid will pass through restrictor 218 as well as valves 120 and 220 and into hydraulic line HOa.
  • hydraulic cylinders 112a and 112b will be actuated to lift the load.
  • valve 222 may again be closed while valves 120 and 220 remain open to allow hydraulic fluid under pressure from the source of pressurized hydraulic fluid generally at 102 to pass into the accumulator.
  • the accumulator may be recharged when piston rod 318 reaches its maximum extension while valves 120 and 220 remain open.
  • the operator interrupts the connection between hydraulic lines HOa and HOb and hydraulic pump 114 using selector valve 108. Valves 216 and 220 are then opened. Any forces on hydraulic cylinders 112a and 112b are then dampened by the entry and release of hydraulic fluid from accumulator 116.
  • a typical earth moving apparatus includes a bucket for holding earth.
  • the bucket includes a floor, a rear wall, two upstanding opposing side walls, an open front, and an open top.
  • An apron, or gate is located opposite the rear wall of the bucket and can swing closed to hold the soil in the bucket during transport.
  • a blade is located adjacent the front edge of the floor of the bucket and cuts the earth to a predetermined depth as the earth moving apparatus is moved forward over the earth's surface. The soil cut from the earth by the blade is collected in the bucket. When the bucket is full of soil, the earth moving apparatus is transported to another location where the soil is deposited.
  • Other examples of earth moving apparatuses having a bucket include, but are not limited to, dump trucks, backhoes, and front end loaders.
  • the depicted exemplary earth moving apparatus generally at 300 includes a frame 302, a cutting blade 304, a bucket 306, an apron 308 a tongue 310 and at least two ground engaging wheels 312.
  • An actuator such as hydraulic cylinder 112a has a first end 314 and a second end 316.
  • a piston rod 318 of the hydraulic cylinder 112a is extended (as shown), the frame 302 is effectively raised.
  • the imposed weight of frame 302 thus applies pressure upon the piston rod of hydraulic cylinder 112a.
  • the pressure stored in accumulator 116 may be used extend piston rod 318 of the hydraulic cylinder to effectively raise the frame 302 and therefore the bucket 306 and the cutting blade 304.
  • the operator When beginning an earth scraping operation using an earth moving apparatus such as the an earth moving apparatus generally at 300, the operator first lifts the frame 302 by supplying hydraulic pressure to hydraulic cylinders 112a and 112b through hydraulic line HOa by the selection of the proper setting of selector valve 108.
  • the charging of the hydraulic accumulator 116 would occur automatically when the piston rod 318 is fully extended, if the hydraulic system is equipped with a check valve 118, or, if the earth moving apparatus 300 is equipped with a cushion ride system, such as the cushion ride system generally at 210, the accumulator can be charged when piston rod 318 reaches its maximum extension and valves 120 and 220 are opened or when valve 222 is closed and valves 120 and 220 are opened.
  • the operator or a sensor input may select to raise the frame 302, and thereby bucket 306 and cutting blade 304.
  • engine 109 may not have enough power to both pull earth moving apparatus 300 and provide sufficient hydraulic pressure via hydraulic pump 104 to lift frame 302, and thereby bucket 306 and cutting blade 304.
  • the operator or a sensor input from as sensor such as sensor 224 causes valves 120 and 220 to open releasing the hydraulic pressure stored in hydraulic accumulator 116, through valves 120 and 220, and into hydraulic line HOa.
  • hydraulic pressure stored in hydraulic accumulator is sufficient, piston rod 318 of hydraulic cylinder 112a will be extended, raising the frame 302, and thereby bucket 306 and cutting blade 304.
  • the resistance to the pull of the prime mover will be thereby decreased allowing the engine 109 to provide enough power to both pull earth moving apparatus 300 and provide sufficient further hydraulic pressure via hydraulic pump 104 to lift frame 302, and thereby bucket 306 and cutting blade 304.
  • the accumulator 116 will be recharged when piston rod 318 reaches its maximum extension, or, if the earth moving apparatus 300 is equipped with a cushion ride system, such as the cushion ride system generally at 210, the accumulator may be recharged when piston rod 318 reaches its maximum extension and valves 120 and 220 are opened or when valve 222 is closed and valves 120 and 220 are opened.

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

Abstract

La présente invention comprend des systèmes hydrauliques conçus pour permettre la sélection d’une source de fluide hydraulique sous pression pour lever une charge. Dans un mode de réalisation, un système hydraulique selon la présente invention comprend un accumulateur hydraulique qui peut être sélectionné en tant que source de fluide hydraulique sous pression pour lever une charge. Un tel système hydraulique peut faire partie ou ne pas faire partie d’un système amortisseur. La présente invention comprend également des procédés pour sélectionner une source de fluide hydraulique sous pression pour lever une charge et des appareil de terrassement ou d’ameublissement du sol qui permettent la sélection d’une source de fluide hydraulique sous pression pour lever une charge.
EP06738394A 2005-03-15 2006-03-15 Assistance de levage hydraulique pour appareils de terrassement remorques Withdrawn EP1872017A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66170305P 2005-03-15 2005-03-15
PCT/US2006/009329 WO2006099489A1 (fr) 2005-03-15 2006-03-15 Assistance de levage hydraulique pour appareils de terrassement remorques

Publications (1)

Publication Number Publication Date
EP1872017A1 true EP1872017A1 (fr) 2008-01-02

Family

ID=36581961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06738394A Withdrawn EP1872017A1 (fr) 2005-03-15 2006-03-15 Assistance de levage hydraulique pour appareils de terrassement remorques

Country Status (4)

Country Link
US (1) US20060237203A1 (fr)
EP (1) EP1872017A1 (fr)
CA (1) CA2601696A1 (fr)
WO (1) WO2006099489A1 (fr)

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