US3353352A - Load balancing system for hydraulic jack - Google Patents

Load balancing system for hydraulic jack Download PDF

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Publication number
US3353352A
US3353352A US519855A US51985566A US3353352A US 3353352 A US3353352 A US 3353352A US 519855 A US519855 A US 519855A US 51985566 A US51985566 A US 51985566A US 3353352 A US3353352 A US 3353352A
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United States
Prior art keywords
pressure
fluid
accumulator
rod
jack
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.)
Expired - Lifetime
Application number
US519855A
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English (en)
Inventor
Charles W Gardner
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.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to US519855A priority Critical patent/US3353352A/en
Priority to GB54101/66A priority patent/GB1118060A/en
Priority to FR89940A priority patent/FR1507468A/fr
Priority to DEC41185A priority patent/DE1286278B/de
Application granted granted Critical
Publication of US3353352A publication Critical patent/US3353352A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/025—Installations or systems with accumulators used for thermal compensation, e.g. to collect expanded fluid and to return it to the system as the system fluid cools down
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/064—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam with devices for saving the compressible medium
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1466—Hollow piston sliding over a stationary rod inside the cylinder
    • 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
    • F15B2211/30505—Non-return valves, i.e. check 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41581—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an output member
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers
    • 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
    • F15B2211/875—Control measures for coping with failures
    • F15B2211/8755—Emergency shut-down

Definitions

  • ABSTRACT OF THE DISCLOSURE A fluid operated system for balancing at least a portion of the weight of a machine component wherein the system includes a fluid control circuit for supplying fluid under pressure to an internal expansible chamber located in-the rod member of a double acting hydraulic jack which jack is used to actuate said machine component and whereby during normal operation said expansible chamber is supplied with sufficient pressure fluid to balance or offset at least a portion of the weight of said machine component.
  • This invention relates to a load balancing or booster system for a hydraulic jack to offset or compensate for a certain portion of the load on the jack cylinder.
  • the invention is particularly suited for use with a double acting hydraulic jack wherein the load balancing system comprises a single acting hydraulic cylinder associated with the regular double acting cylinder.
  • the invention is directed to a system wherein the aforementioned deficiencies are eliminated without the use of extra-large power units.
  • the invention is directed to a system whereby otherwise wasted horsepower is converted to useful output by the use of a novel and simply constructed means for balancing the weight of hydraulically actuated components carried by the machine.
  • Another object of this invention is to provide a double acting hydraulic jack with a self-contained single acting hydraulic cylinder operated by fluid from an accumulator to supply a load balancing force for components actuatet by said jack.
  • Yet another object of this invention is to provide a ve hicle having a double acting hydraulic jack for actuating components with an auxiliary booster chamber located it the rod member of said jack, which booster chamber is provided with hydraulic pressure from an accumulator tc offset the weight of said components and thereby relieve the vehicle power plant of extra load when power is required for maneuvering the vehicle.
  • FIG. 1 is a longitudinal view, partially in section, oi one embodiment of a hydraulic jack constructed in accordance with the invention
  • FIG. 2 is a'longitudinal view, partially in section, of a second embodiment of a hydraulic jack constructed in accordance with the invention.
  • FIG. 3 is a schematic view illustrating a hydraulic circuit for use in conjunction with either of the embodiments shown in FIGS. 1 and 2.
  • FIG. 1 there is shown a double acting hydraulic jack 10 having a main cylinder 12 from which a slidable rod 14 is extended to raise or manipulate a load.
  • Therod end of the cylinder 12 is provided with a removable -block 16 which has a packing gland 18 secured thereto as by fastening means 19.
  • Both the block 16- and the gland 18 are provided with a central bore which slidably receives the rod 14.
  • Suitable packing 22 is provided to insure that the system is fluid-tight.
  • an O-ring seal 24 provides a fluid-tight connection between the block 16 and the main cylinder 12.
  • the terminal end of rod 14 which is received within cylinder 12 is provided with an external annular piston 26 which is held in place against an external circumferential rod shoulder 28 by means of a threaded nut 30. Piston 26 is slidably received against the inner wall of cylinder 12; an O-ring seal 32 preventing fluid passage therebetween.
  • a large bore 34 extends longitudinally from the inner end of rod 14 to a point near the outer end of said rod. The purpose of bore 34 will become apparent from the discussion infra.
  • a tube 36 extends downwardly from the head end of cylinder 12 in a manner such that it is received within the bore 34 of rod 14 whether the rod is in an extended or retracted position.
  • the inner end of tube 36 is provided with an enlarged ring member 38 which engages the Wall of bore 34 in slidable and fluid-tight relation.
  • tube 36 is provided with a reduced diameter portion 40 which protrudes through an aperture in the head of cylinder 12 and is rigidly fastened thereto by suitable means such as the nut 42.
  • a fluid passageway 44 extends throughout the length of tube 36 and is adapted to communicate at its upper end with a hydraulic circuit which will be described With respect to FIG. 3, infra.
  • FIG. 2 illustrates a modified embodiment of a double acting jack wherein the jack is retracted rather than extended to manipulate a load.
  • Many components of the iack 10 shown in FlG. 2 are identical with components previously described with reference to jack 10 of FIG. 1. Accordingly, prime numerals have been assigned to those components in FIG. 2 which correspond to like components in FIG. 1.
  • the tube 37 of FIG. 2 has a considerably smaller outer diameter than the tube 36 of FIG. 1 and the lower end of passageway 44 is closed as by a cap member 3%.
  • the upper end of rod bore 3 5 is provided with an annular plug 41 adapted for slidable sealed engagement with tube 37.
  • a variable sized annular chamber 43 is formed having upper and lower walls defined by members 41 and 38, respectively.
  • a plurality of radial ports 45 permit fluid communication between tube passageway 44 and chamber 43.
  • FIG. 3 illustrates a hydraulic circuit which is adapted to supply fluid pressure to the load balancing chambers of either of the embodiments shown in FIGS. 1 and 2.
  • the hydraulic jack 10 of FIG. 1 is shown connected to the circuit of FIG. 3.
  • a conventional accumulator 55 having a piston 56 and a supply of compressible fluid 57 is connected to conduit 59 via conduit 61 and a suitable pressure control valve 63.
  • Accumulator 55 is also connected to a fluid tank or reservoir 65 via conduit 67, a safety valve 69 and conduit 71.
  • the accumulator 55 is initially charged in a conventional manner by alternately directing fluid from a hydraulic jack circuit (not shown) to ports 46 and 48.
  • extension of rod 14 will initially draw fluid from reservoir 65, through a check valve 73, conduit 59 and into rod bore chamber 34 (see FIG. 1), while reverse movement of rod 14 will direct such fluid back through line 59 and a check valve 75 into the accumulator 55.
  • Successive cycles of jack 10 will eventually charge the accumulator 55 to a predetermined pressure which will open the pressure control valve 63 and further strokes of rod 14 will have no effect on check valves 73 and 75 due to the pressure which has built up in lines 59 and 67. It should be apparent that successive strokes of the rod 14 of the jack embodiment shown in FIG. 2 would serve to initially charge the accumulator 55 in like fashion.
  • the pressure control valve 63 When the pressure in the accumulator 55 is in the operative range, the pressure control valve 63 will remain open to permit flow of fluid through line 59 in both directions. In this manner as the load balancing chamber in rod bore 34 (see FIG. 1) expands, fluid flows from the accumulator 55 to the said chamber and as the chamber contracts, the fluid flow is in a direction back to the accumulator. Should leakage in the system result in a reduction of pressure in the accumulator 55 below a predetermined minimum, control valve 63 will close and as the rod 14 is extended and retracted, the circuit will be re- 4 charged by flow of oil through the check valves 73 and 75, as previously described.
  • the safety valve 69 is provided with a spool 77 which is normally urged to open the valve under the action of spring St). However, when the engine of the vehicle is running, lubricating oil pressure therefrom enters through conduit 82 to force spool 77 against an internal circumferential shoulder 81 as shown and thus prevent fluid communication between accumulator 55 and the reservoir 65. When the engine is shutdown or the engine oil pressure is lost for some other reason, the valve spool 77 is spring biased to a position establishing communication between accumulator 55 and reservoir 65. Such an arrangement allows the hydraulic jack components to be brought to rest in a lowered or inoperative position during extended shutdown periods as a safety precaution.
  • valve 69 could be responsive to any signal which indicates when the vehicle engine is operative.
  • the valve could be controlled by transmission control pressure or by pressure from the main implement control system pump which is operative any time the engine is running.
  • the valve could be solenoid controlled in response to opening or closing of the main power switch.
  • a hydraulic jack having the usual cylinder, piston and rod, said rod having a bore opening at its inner end, a tube having a first end fixedly secured to and extending through the head end of said cylinder, said tube having a second end portion extending into said rod bore, a stationary wall member fixedly secured to the tube and slidably fitting the rod bore to define one end of an internal expansible chamber within said rod bore, hydraulic fluid means for extending and retracting said jack, and a hydraulic circuit for directing fluid from a pressure fluid reservoir through said tube and into said expansible chamber, said hydraulic circu t comprising an accumulator chargeable to a pred termined pressure by extending and retracting said jack, a pressure control valve located in said hydraulic circuit between said accumulator and said expansible chamber for prventing fluid flow between said expansible chamber and said accumulator
US519855A 1966-01-11 1966-01-11 Load balancing system for hydraulic jack Expired - Lifetime US3353352A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US519855A US3353352A (en) 1966-01-11 1966-01-11 Load balancing system for hydraulic jack
GB54101/66A GB1118060A (en) 1966-01-11 1966-12-02 Load balancing system for hydraulic jack
FR89940A FR1507468A (fr) 1966-01-11 1967-01-04 Dispositif d'équilibrage de charge pour vérin hydraulique
DEC41185A DE1286278B (de) 1966-01-11 1967-01-11 Einrichtung fuer den Ausgleich mindestens eines Teiles des Gewichtes eines Maschinenteiles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US519855A US3353352A (en) 1966-01-11 1966-01-11 Load balancing system for hydraulic jack

Publications (1)

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US3353352A true US3353352A (en) 1967-11-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US519855A Expired - Lifetime US3353352A (en) 1966-01-11 1966-01-11 Load balancing system for hydraulic jack

Country Status (4)

Country Link
US (1) US3353352A (fr)
DE (1) DE1286278B (fr)
FR (1) FR1507468A (fr)
GB (1) GB1118060A (fr)

Cited By (24)

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Publication number Priority date Publication date Assignee Title
US3468222A (en) * 1966-07-06 1969-09-23 Hugo H Cordes Control for a ramming hammer with hydraulic drive
US3548573A (en) * 1968-04-17 1970-12-22 Cessna Aircraft Co Cylinder with integral accumulator
US3622124A (en) * 1970-05-18 1971-11-23 Kenneth R Sidles Hydraulic lift jack
US3680400A (en) * 1969-05-14 1972-08-01 Mesta Machine Co Force-multiplying mechanisms
US4005641A (en) * 1974-01-04 1977-02-01 Patent & Inventions Ltd. Apparatus for rotating and displacing in axial direction a machine element
US4103280A (en) * 1972-11-29 1978-07-25 Institut Francais Du Petrole Des Carburants Et Lubrifiants Device for emitting acoustic waves in a liquid medium
US4409884A (en) * 1981-03-25 1983-10-18 Mcdonnell Douglas Corporation Synchronization cylinder
US4790728A (en) * 1985-02-12 1988-12-13 Dwyer Anthony F Dual-rigid-hollow-stem actuators in opposite-phase slurry pump drive having variable pumping speed and force
EP0314660A1 (fr) * 1987-10-28 1989-05-03 BT Industries Aktiebolag Dispositif de levage hydraulique
US4955282A (en) * 1989-03-27 1990-09-11 Ranson Ronald W Uniform flow hydraulic system
US5099749A (en) * 1990-04-19 1992-03-31 Darish Joseph J Compound motion fluid actuating device and method
US5172625A (en) * 1991-11-04 1992-12-22 Latham Robert P Hydraulic cylinder with lateral support
US5191825A (en) * 1992-06-12 1993-03-09 Doben Limited Low-impact air cylinder
US5331884A (en) * 1992-06-04 1994-07-26 Ando Seisakujo Co., Ltd. Fluid cylinder with cooling passages
US20050201874A1 (en) * 2004-03-11 2005-09-15 Atkinson Dana S. Innerscoping hydraulic system
WO2007033491A1 (fr) * 2005-09-26 2007-03-29 George Wojciech Furgala Vérin hydraulique sollicité par un gaz
EP2524997A1 (fr) * 2011-05-18 2012-11-21 Liebherr-Hydraulikbagger GmbH Outil de travail, en particulier machine d'excavation ou machine de transvasement de matériel
US20130168516A1 (en) * 2012-01-04 2013-07-04 National Oilwell Varco, L.P. Apparatus and Method for Positioning Connection Equipment on a Drilling Rig
JP2014118981A (ja) * 2012-12-13 2014-06-30 Showa:Kk 古紙圧縮梱包機における省エネ油圧シリンダ装置
CN104154070A (zh) * 2014-08-22 2014-11-19 实用动力(中国)工业有限公司 双作用螺母锁紧液压油缸
WO2015022054A1 (fr) * 2013-08-16 2015-02-19 Hydac Technology Gmbh Système permettant l'adaptation automatique d'une quantité d'apport de gaz pouvant être prédéfinie et dispositif d'actionnement pourvu d'un tel système
AU2013200736B2 (en) * 2012-02-13 2015-08-20 Schlumberger Technology B.V. Adaptive hydraulic cylinder with floating seal interface
US20160061229A1 (en) * 2014-08-26 2016-03-03 Ut-Battelle, Llc Energy Efficient Fluid Powered Linear Actuator With Variable Area and Concentric Chambers
US9964124B2 (en) * 2015-09-02 2018-05-08 Deere & Company Piston accumulator with integrated cylinder rod

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Publication number Priority date Publication date Assignee Title
DE2741497C2 (de) * 1977-09-15 1981-09-17 Jungheinrich Unternehmensverwaltung Kg, 2000 Hamburg Hydraulikanlage für den Hubantrieb eines Hubladers
DE3608338A1 (de) * 1986-03-13 1987-09-17 Fuchs Systemtechnik Gmbh Hydraulischer stellantrieb fuer einen elektrodentragarm eines lichtbogenofens
CA1299207C (fr) * 1987-01-08 1992-04-21 Charles B. Steger Actionneur hydraulique double action pour suspension active
US4828229A (en) * 1987-11-16 1989-05-09 General Motors Corporation Hydraulic actuator for active ride suspension
FR2753751B1 (fr) * 1996-09-23 1999-01-08 Dispositif de verin hydraulique simple effet
NL1029161C2 (nl) * 2005-06-01 2006-12-04 Actuant Corp Aandrijfcilinder met geïntegreerde gasveerwerking.
DE102007061294A1 (de) 2007-12-10 2009-06-18 Thomas Sauer Hydraulikzylinder mit drei Hubkammern und Energiespeicher
CN116624442A (zh) * 2023-07-24 2023-08-22 南京理工大学 带有重力矩补偿的电动推杆摇臂支撑系统

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US2641106A (en) * 1952-01-03 1953-06-09 Cleveland Automatic Machine Co Electrohydraulic system having a safety shutoff valve for its accumulator
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Cited By (28)

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US3468222A (en) * 1966-07-06 1969-09-23 Hugo H Cordes Control for a ramming hammer with hydraulic drive
US3548573A (en) * 1968-04-17 1970-12-22 Cessna Aircraft Co Cylinder with integral accumulator
US3680400A (en) * 1969-05-14 1972-08-01 Mesta Machine Co Force-multiplying mechanisms
US3622124A (en) * 1970-05-18 1971-11-23 Kenneth R Sidles Hydraulic lift jack
US4103280A (en) * 1972-11-29 1978-07-25 Institut Francais Du Petrole Des Carburants Et Lubrifiants Device for emitting acoustic waves in a liquid medium
US4005641A (en) * 1974-01-04 1977-02-01 Patent & Inventions Ltd. Apparatus for rotating and displacing in axial direction a machine element
US4409884A (en) * 1981-03-25 1983-10-18 Mcdonnell Douglas Corporation Synchronization cylinder
US4790728A (en) * 1985-02-12 1988-12-13 Dwyer Anthony F Dual-rigid-hollow-stem actuators in opposite-phase slurry pump drive having variable pumping speed and force
EP0314660A1 (fr) * 1987-10-28 1989-05-03 BT Industries Aktiebolag Dispositif de levage hydraulique
US4955282A (en) * 1989-03-27 1990-09-11 Ranson Ronald W Uniform flow hydraulic system
US5099749A (en) * 1990-04-19 1992-03-31 Darish Joseph J Compound motion fluid actuating device and method
US5172625A (en) * 1991-11-04 1992-12-22 Latham Robert P Hydraulic cylinder with lateral support
US5331884A (en) * 1992-06-04 1994-07-26 Ando Seisakujo Co., Ltd. Fluid cylinder with cooling passages
US5191825A (en) * 1992-06-12 1993-03-09 Doben Limited Low-impact air cylinder
US20050201874A1 (en) * 2004-03-11 2005-09-15 Atkinson Dana S. Innerscoping hydraulic system
US7448310B2 (en) * 2004-03-11 2008-11-11 Atkisek Corporation Innerscoping hydraulic system
WO2007033491A1 (fr) * 2005-09-26 2007-03-29 George Wojciech Furgala Vérin hydraulique sollicité par un gaz
EP2524997A1 (fr) * 2011-05-18 2012-11-21 Liebherr-Hydraulikbagger GmbH Outil de travail, en particulier machine d'excavation ou machine de transvasement de matériel
US9212778B2 (en) * 2012-01-04 2015-12-15 National Oilwell Varco, L.P. Apparatus and method for positioning connection equipment on a drilling rig
US20130168516A1 (en) * 2012-01-04 2013-07-04 National Oilwell Varco, L.P. Apparatus and Method for Positioning Connection Equipment on a Drilling Rig
US9435359B2 (en) 2012-02-13 2016-09-06 Schlumberger Technology Corporation Adaptive hydraulic cylinder with floating seal interface
AU2013200736B2 (en) * 2012-02-13 2015-08-20 Schlumberger Technology B.V. Adaptive hydraulic cylinder with floating seal interface
JP2014118981A (ja) * 2012-12-13 2014-06-30 Showa:Kk 古紙圧縮梱包機における省エネ油圧シリンダ装置
WO2015022054A1 (fr) * 2013-08-16 2015-02-19 Hydac Technology Gmbh Système permettant l'adaptation automatique d'une quantité d'apport de gaz pouvant être prédéfinie et dispositif d'actionnement pourvu d'un tel système
CN104154070A (zh) * 2014-08-22 2014-11-19 实用动力(中国)工业有限公司 双作用螺母锁紧液压油缸
US20160061229A1 (en) * 2014-08-26 2016-03-03 Ut-Battelle, Llc Energy Efficient Fluid Powered Linear Actuator With Variable Area and Concentric Chambers
US9494168B2 (en) * 2014-08-26 2016-11-15 Ut-Battelle, Llc Energy efficient fluid powered linear actuator with variable area and concentric chambers
US9964124B2 (en) * 2015-09-02 2018-05-08 Deere & Company Piston accumulator with integrated cylinder rod

Also Published As

Publication number Publication date
DE1286278B (de) 1969-01-02
FR1507468A (fr) 1967-12-29
GB1118060A (en) 1968-06-26

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