EP0105783A1 - Gleichachsiger hydraulischer Mehrkammerstellantrieb und System mit synchronisierten Stelleantrieben dieses Typs - Google Patents

Gleichachsiger hydraulischer Mehrkammerstellantrieb und System mit synchronisierten Stelleantrieben dieses Typs Download PDF

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Publication number
EP0105783A1
EP0105783A1 EP83401841A EP83401841A EP0105783A1 EP 0105783 A1 EP0105783 A1 EP 0105783A1 EP 83401841 A EP83401841 A EP 83401841A EP 83401841 A EP83401841 A EP 83401841A EP 0105783 A1 EP0105783 A1 EP 0105783A1
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EP
European Patent Office
Prior art keywords
piston
rod
annular
chamber
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.)
Granted
Application number
EP83401841A
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English (en)
French (fr)
Other versions
EP0105783B1 (de
Inventor
Pierre Charles Mouton
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.)
Safran Aircraft Engines SAS
Original Assignee
Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
SNECMA SAS
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Publication date
Application filed by Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA, SNECMA SAS filed Critical Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
Publication of EP0105783A1 publication Critical patent/EP0105783A1/de
Application granted granted Critical
Publication of EP0105783B1 publication Critical patent/EP0105783B1/de
Expired 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • 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
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/50—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
    • F15B2211/505—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
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid 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
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
    • 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
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/521—Pressure control characterised by the type of actuation mechanically
    • F15B2211/524—Pressure control characterised by the type of actuation mechanically actuated by an output member of the circuit
    • 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
    • F15B2211/7053—Double-acting output members
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7107—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being mechanically linked
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series
    • 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
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Definitions

  • Cylinders of this type include, for example, two cylinders, one of which, which can be called “working cylinder” encloses a piston intended to apply a displacement force to a mobile structure, and the other of which, may be called “pilot cylinder” encloses a piston mechanically or hydraulically linked to the piston of the working cylinder and is in particular used in a hydraulic circuit comprising the pilot cylinder of at least one other cylinder to impose synchronous strokes on all the pistons of the cylinders of job. Synchronization is indeed necessary in all the sets of mobile structural elements whose mutual connections have little or no rigidity, and hydraulic synchronization of the control cylinders makes it possible to avoid the complications of a mechanical synchronization system.
  • each chamber of the "pilot cylinder” communicates through a passage in the second piston with the conduit fixed on its opposite face.
  • the object is to obtain a cylinder free of the drawbacks noted above and which also has the advantage of requiring only three liquid circulation pipes to control said cylinder, instead of four in the realization of the aforementioned prior art, which makes it possible to implement, in a system of synchronized jacks, a set of pipes with a smaller footprint and a simpler assembly.
  • a hydraulic cylinder according to the invention is characterized in that the central piston separates the central enclosure into two chambers and the dividing wall is traversed by at least one orifice which makes the cylindrical chamber and the annular chamber both located on the side communicate of the stem.
  • Another object of the invention is a system of synchronized jacks which is essentially characterized in that it comprises at least two jacks according to the invention and means for bringing the annular section chamber of one of said jacks into communication. located on the side of the annular rod with respect to the annular piston with the annular section chamber of the other cylinder situated on the side opposite to the annular rod with respect to the annular piston.
  • the arrows carried by the pipes indicate the direction of circulation of the liquid imposing the extension of the jack or jacks represented.
  • each jack The cylinder 10 and the cylinder 15 of each jack are rigidly linked to each other and to a common frame, which has been symbolized by hatching. All the connections a are connected in parallel by pipes R to one of the supply ports of a hydraulic control unit U, while all the connections b are connected in parallel by pipes S to the other port d 'adduction of said unit.
  • the cylinders Vl, V2 and V3 therefore operate as double-acting cylinders. From the direction of the arrows carried by the pipes, it can be seen that the case envisaged in the figure is that where the pipes R discharge the liquid into the chambers A while the pistons 11 push the liquid from the chambers B into the pipes S.
  • connection d of each cylinder As for the connection d of each cylinder, it is connected by a pipe T to the connection c of the cylinder, the index of which follows, observing the rules of circular permutation.
  • the cylinders 10 can be called “cylinders of work "because each of them exerts, by means of its piston 11, a differential thrust, positive or negative, resulting from the pressures admitted respectively in the chambers A and B.
  • the cylinders 15 can be called" pilot cylinders "because the differential thrust that each exerts on the rod 12 of the corresponding cylinder 10 constitutes a term of correction of thrust which is added algebraically to the thrust exerted by the piston 11 to obtain an identical elongation of all the jacks. All the points of the structure ST linked to the rods 12 therefore undergo an identical translation.
  • the double jack proposed by the aforementioned patent application, illustrated by FIG. 2 does not have these drawbacks, because the cylinders are co-axial.
  • the chambers and fittings which perform the same functions as in the double jacks in FIG. 1 are designated by the same letters as in this one.
  • the latter carries a bell-shaped rod 22 which emerges from the bottom of the cylinder 20 by a sealed passage and which plays at the same time the role of rod transmitting the force of the jack and the role of pilot cylinder.
  • a piston 23, around which the bell 22 slides, is supported, on the side of the bottom 24 of the cylinder 20 opposite the bell, by a hollow shaft 25 carrying the connection c and tightly connected to said bottom 24 and, from the side of the bell, by a hollow shaft 26 which carries the connector d and which passes through the bell by a sealed passage.
  • the pilot cylinder constituted by the bell 22 is therefore mobile relative to the working cylinder 20 while the piston 23, housed in this pilot cylinder, is mobile relative to the latter but fixed relative to the working cylinder 20.
  • the piston 23 is traversed by orifices c ′ and through which, respectively, the hollow shaft 25 puts the connection c in communication with the chamber C (portion of the bell 22 which surrounds the hollow shaft 26) while the 'hollow shaft 26 puts the connection d in communication with the chamber D (portion of the bell 22 which surrounds the hollow shaft 25). Consequently, as in the examples of double cylinders in FIG.
  • the structural elements to which the jack must impart a relative movement are not shown.
  • the bottom 31 on the foot side of the double cylinder 30 is for example fixed to one of these elements by an ear 32.
  • the external rod 64 of the double piston 60 (see below), which emerges from the bottom 33 on the head side of the cylinder, is for example fixed to the other element by an ear 66.
  • the annular median wall 34 is adjoining the central cavity 51 of the cylinder and the peripheral cavity 52 which is delimited externally by the external wall 35.
  • the latter carries near the bottom 31 a coupling boss 36 and near the bottom 33 a boss 37. These two drilled bosses allow the connection of the cavity 52 with tubes not shown.
  • the bottom 31 carries a drilled boss 38 which allows the connection of the cavity 51 with a third pipe, not shown.
  • the rods 63 and 64 are linked by a bottom 65 which closes the cavity of the rod 64 to form a sealed bell and which carries the ear 66.
  • the circumference of the central piston 61, the inner and outer edges of the annular piston 62, the edge of the opening 41 and the outer and inner edges of the opening 42 carry O-rings.
  • An axial channel 71 is drilled in the central piston 61 and in the central rod 63 and communicates with at least one lumen 72 which opens into the periphery of the rod 63 near the bottom 65. Lights 73 pass through the peripheral rod 64 nearby piston 62.
  • the chamber C is the only one to communicate with a tube possibly connected to the bore of the boss 36.
  • FIG. 4 shows the cylinder of Figure 3, according to the invention, in a schematic form similar to that already used in Figures 1 and 2 relating to double cylinder cylinders of the prior art.
  • pistons 61 and 62 which separate, the first, chambers A and B and, the second, chambers C and D.
  • the additional piston constituted by the bottom 65 which connects the central rod 63 and the annular rod 64.
  • the connections a, c and d respectively allow the connection of pipes with the chamber A (boss 38 of FIG. 3), the chamber C (boss 36) and the chamber D (boss 37).
  • the two pistons are arranged in the same transverse plane in order to avoid the presence of residual volumes at the end of the stroke.
  • the jack of the invention can be used as an isolated jack.
  • the pressure in chambers A, C and E causes the extension of the jack and the cancellation of this pressure causes retraction under the effect of the reaction of the load applied to the ear 66.
  • the jack of the invention as a double-acting insulated jack, one can, to obtain the extension, switch the pressure source on chambers A and E (connection a) or on chambers A, C and E (connections a and c). The retraction is obtained by switching the pressure source to chambers B and D (connection d).
  • FIG. 5 illustrates the case where these jacks are used as single-acting jacks
  • FIG. 6 illustrates the case where they are used as double-acting jacks.
  • the pressure source is represented by a distributor making it possible to switch the connection pipes either on a pressure tank or on a tank to thus constitute a control unit U.
  • the extension of the cylinders is obtained by injecting the pressurized liquid into the fittings a (chambers A and E) supplied in parallel by pipes R.
  • connection d of each cylinder is connected to the connection c of the cylinder which follows it in the order of the indices and marks, using the rules of circular permutation. More precisely, if we denote by c (J) and d (J) the connections c and d of a jack V '(J), J taking the discrete values from 1 to N, any connection d (J) is connected by means of a cana connection T to connection c (J + 1), with the exception of connection d (N) - here, connection d of cylinder V'4 - connected to connection c (l) - here, connection c of cylinder V ' 1 - by means of the pipe Tl.
  • the jacks are thus connected to each other in a closed loop and controlling each other.
  • connection d (N) For double-acting use, as shown in FIG. 6, the pipes T remain and a pipe T2 connects the connection d (N) to the control unit U to allow the circulation of the pump liquid.
  • the connection c (1) is supplied by means of a pipe T3 in parallel with the connection a (l).
  • the passage from extension to retraction is obtained by reversing the direction of circulation of the hydraulic fluid by acting on the distributor.
  • the piston 62 of the pilot cylinder of each jack comprises a device automatically balancing the pressures which prevail on both sides at the end of the stroke. other of this piston.
  • This device can consist, for example, of a valve 81 housed in an orifice 80 formed in the piston. This valve is held against its seat by a spring 83 and carries a pusher 82 oriented towards the wall 33 which pushes it back at the end of the stroke. If the cylinder is intended to operate in double effect, it is advantageous to accommodate in the same piston a second valve identical but whose pusher is oriented towards the wall 31 ( Figure 3).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)
EP83401841A 1982-09-28 1983-09-21 Gleichachsiger hydraulischer Mehrkammerstellantrieb und System mit synchronisierten Stelleantrieben dieses Typs Expired EP0105783B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8216263 1982-09-28
FR8216263A FR2533644B1 (fr) 1982-09-28 1982-09-28 Verin hydraulique a chambres multiples coaxiales et systemes de commande par verins synchronises de ce type

Publications (2)

Publication Number Publication Date
EP0105783A1 true EP0105783A1 (de) 1984-04-18
EP0105783B1 EP0105783B1 (de) 1986-11-05

Family

ID=9277787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401841A Expired EP0105783B1 (de) 1982-09-28 1983-09-21 Gleichachsiger hydraulischer Mehrkammerstellantrieb und System mit synchronisierten Stelleantrieben dieses Typs

Country Status (6)

Country Link
US (1) US4531451A (de)
EP (1) EP0105783B1 (de)
JP (1) JPS5977107A (de)
DE (1) DE3367439D1 (de)
FR (1) FR2533644B1 (de)
IT (1) IT8322757A0 (de)

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US4729283A (en) * 1983-11-11 1988-03-08 Delibes Pty. Ltd. Valve for use with hydraulic ram assemblies
JPH01166700U (de) * 1988-05-17 1989-11-22
JPH0786350B2 (ja) * 1988-06-20 1995-09-20 英夫 星 多重シリンダ装置
US5058384A (en) * 1990-09-20 1991-10-22 University Of British Columbia Digital actuator
US5341725A (en) * 1993-06-14 1994-08-30 Dick James B Twin piston power cylinder
DE19632012A1 (de) * 1996-08-08 1998-04-09 Karsten Bock Umformpresse zum Anspitzen von Rohren
DE19705414C1 (de) * 1997-02-13 1998-04-09 Daimler Benz Ag Pneumatisches Stellorgan zum zumindest teilweisen Öffnen eines beweglichen Karosserieteiles eines Kraftfahrzeugs
US6000315A (en) * 1998-05-04 1999-12-14 Deere & Company Lift control for implement frame
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US7603942B1 (en) 2006-09-29 2009-10-20 Hwh Corporation Synchronization cylinder having chambers with different volumes
US20120325081A1 (en) * 2010-12-22 2012-12-27 Reed Vivatson High power hydraulic cylinder
CA2761831A1 (en) * 2011-12-13 2013-06-13 Jerry L. Hopfe Portable apparatus for storing water and melting frozen water
US8950091B2 (en) 2012-03-26 2015-02-10 Caterpillar Global Mining Llc Dragline bucket with remote dumping and positioning capabilities
US9234587B2 (en) * 2012-05-23 2016-01-12 Caterpillar Global Mining Llc Multi-capacity cylinder
US8601934B1 (en) * 2012-08-06 2013-12-10 Westendorf Manufacturing Co., Inc. Two piston cylinder
FI124684B (fi) 2012-12-03 2014-12-15 Ponsse Oyj Nosturi
WO2015113174A1 (es) * 2014-01-31 2015-08-06 Chesta Ingeniería S.A. Servomotor de doble cilindro para sistemas de frenos
CN104948520B (zh) * 2014-03-26 2017-09-22 广东科达洁能股份有限公司 一种集成式伺服多缸同步器
US9494168B2 (en) * 2014-08-26 2016-11-15 Ut-Battelle, Llc Energy efficient fluid powered linear actuator with variable area and concentric chambers
EP3064782B1 (de) * 2015-03-06 2018-06-20 Otto Nussbaum GmbH & Co. KG Zylinderkolbenaggregat
DE102017202131A1 (de) 2017-02-10 2018-08-16 Siemens Aktiengesellschaft Piezohydraulischer Aktor und Verfahren zum Betreiben eines solchen piezohydraulischen Aktors
EP3746636A4 (de) * 2018-02-01 2021-11-24 Vanderbilt University Zylinderantrieb
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WO2020256564A1 (en) 2019-06-17 2020-12-24 Conrobotix As Cylinder, hydraulic system, construction machine and procedure

Citations (4)

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US2511883A (en) * 1947-05-23 1950-06-20 Bucyrus Erie Co Differential cylinder-piston assembly
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FR2533644A1 (fr) 1984-03-30
US4531451A (en) 1985-07-30
JPH0148402B2 (de) 1989-10-19
JPS5977107A (ja) 1984-05-02
FR2533644B1 (fr) 1986-12-19
EP0105783B1 (de) 1986-11-05
IT8322757A0 (it) 1983-09-02
DE3367439D1 (en) 1986-12-11

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