US20050132876A1 - Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device - Google Patents

Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device Download PDF

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Publication number
US20050132876A1
US20050132876A1 US10/896,931 US89693104A US2005132876A1 US 20050132876 A1 US20050132876 A1 US 20050132876A1 US 89693104 A US89693104 A US 89693104A US 2005132876 A1 US2005132876 A1 US 2005132876A1
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United States
Prior art keywords
servovalve
actuator
hydraulic
interface plate
tank
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Abandoned
Application number
US10/896,931
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English (en)
Inventor
Franck Pollet
Daniel Charles-Bernaud
Philippe Grelat
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Giat Industries SA
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Giat Industries SA
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Assigned to GIAT INDUSTRIES reassignment GIAT INDUSTRIES ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHARLES-BERNAUD, DANIEL, GRELAT, PHILIPPE, POLLET, FRANCK
Publication of US20050132876A1 publication Critical patent/US20050132876A1/en
Abandoned 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
    • F15B13/08—Assemblies of units, each for the control of a single servomotor only
    • F15B13/0803—Modular units
    • F15B13/0807—Manifolds
    • 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
    • F15B11/003—Systems with load-holding 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • 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
    • F15B2211/3051—Cross-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
    • F15B2211/30—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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional 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
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single 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
    • F15B2211/30—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
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional 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
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • 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
    • F15B2211/46—Control of flow in the return line, i.e. meter-out 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
    • 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
    • F15B2211/75—Control of speed of the 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/765—Control of position or angle of the 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/88—Control measures for saving energy

Definitions

  • the technical scope of the invention is that of devices enabling the positioning of a hydraulic actuator to be controlled.
  • These devices generally comprise a hydraulic circuit incorporating a pump (for example of variable size) supplying one or other of the two chambers of the actuator by means of a servovalve.
  • a pump for example of variable size
  • the servovalve is a classical off-the-shelf component and comprises a slide made mobile by a torque motor.
  • This slide may occupy at least three different positions: one central position in which the circuits are closed and two symmetrical positions allowing one or other of the chambers of the actuator to be connected to the hydraulic pump whereas the other chamber is connected to a hydraulic tank or reserve.
  • the slide may also occupy, according to the control given by the torque motor, any intermediate position between the central position and one or other of the extreme positions, each intermediate position corresponding to a different fluid flow provided by the servovalve.
  • Such a servovalve is classically used in closed-loop actuator controls, that is to say controls with position servo control. Such a servovalve may also be used to control an open loop actuator, that is to say one with no position servo control.
  • a controlled non-return valve is positioned between each chamber of the actuator and the servovalve.
  • This non-return valve moreover, improves the positioning accuracy of the open loop actuator.
  • this solution has disadvantages, both when operating in closed loop or open loop. Indeed, the sections of the actuator chambers are different (notably because of the presence of the cylinder rod in one of the chambers). This results in a small jolt at the end of the positioning process leading to an inaccuracy in the final positioning of the actuator.
  • the actuator is a cylinder to ensure the elevation laying of a gun
  • the elevation laying angle obtained is erroneous with respect to the instruction given and the gun is incorrectly laid.
  • the aim of the present invention is to overcome such drawbacks by proposing a control device to position a hydraulic actuator able to be operated both in closed and open loop whilst ensuring positioning accuracy and laying speed.
  • the invention also enables this positioning to be ensured using standard off-the-shelf inexpensive components.
  • the invention relates to a position control device for a hydraulic actuator, such device comprising a hydraulic circuit comprising a pump supplying the two chambers of the actuator from a hydraulic tank or reserve by means of a servovalve, each outlet of the servovalve being connected to a chamber of the actuator by means of a non return valve, such device wherein at least one of the outlets of the servovalve connected a chamber of the actuator is also connected to the hydraulic tank by a calibrated nozzle upstream of the non return valve.
  • the device may comprise a calibrated nozzle connecting each outlet of the servovalve to the hydraulic tank.
  • the invention also relates to a servovalve interface plate enabling this device to be implemented at low cost using standard inexpensive components.
  • This plate incorporates at least four transversal drill holes intended to cooperate with the four hydraulic ports of the servovalve, that is to say a supply of pressurised fluid via a pump, an outlet to a reserve tank, a first control path for a first chamber of the actuator and a second control path for a second chamber of the actuator, such plate wherein it incorporates at least one leak circuit connecting one of the control paths to the tank outlet, such circuit in which is positioned a calibrated nozzle.
  • the servovalve interface plate may incorporate two leak circuits comprising a calibrated nozzle, each circuit connecting one of the control paths to the tank outlet.
  • the leak circuit(s) will advantageously be made in the form of holes perpendicular to one another and to the transversal drill holes corresponding to the different paths.
  • each hole may be stopped by a plug.
  • the nozzle(s) may be made in the form of screws having a calibrated axial orifice.
  • FIG. 1 is a simplified hydraulic schema of a control device according to the invention
  • FIG. 2 is a simplified schema of the interface plate according to the invention
  • FIGS. 3 a, 3 b and 3 c are three views of an embodiment of the interface plate, FIGS. 3 a and 3 b being sections along planes AA and BB respectively in FIG. 3 c.
  • FIG. 1 shows the schema of a device 1 to control the position of a hydraulic actuator 2 , for example a cylinder comprising a piston 2 c integral with a rod 2 d and delimiting two chambers 2 a and 2 b .
  • the cylinder ensures the elevation or traverse laying of a gun barrel (not shown).
  • This device comprises a hydraulic circuit incorporating a pump 3 supplying the two chambers 2 a , 2 b of the actuator 2 by means of a servovalve 4 .
  • the latter is a classical off-the-shelf 4-way flow servovalve.
  • Port T is intended for the return to the tank 5 , inlet port P for the replenishment in fluid by the pump 3 , outlet ports A and B being intended to connect the servovalve 4 to the two chambers 2 a and 2 b of the cylinder 2 .
  • the pump 3 is thus connected by upstream ducting 6 a to the hydraulic tank 5 (or fluid reserve) and discharges by downstream ducting 6 b to the inlet port P of the servovalve 4 .
  • the servovalve 4 is conventionally shown in FIG. 1 in its closed position (median block 4 c in the circuit) in which the four ports A, B, P and T are blocked.
  • the servovalve slide may occupy at least two different active extreme positions:
  • the displacements of the servovalve slide are controlled classically by a torque motor 4 d integrated into the servovalve, such torque motor piloted by an electronic control unit 7 .
  • the extreme positions 4 a , 4 b correspond to the maximal fluid discharges supplied by the servo vale.
  • the slide may classically occupy intermediate positions between the closed position and one or other of the two extreme positions. These intermediate positions correspond to different fluid discharges transmitted according to one or other of the control paths.
  • the outlet ports A and B of the servovalve 4 are connected by ducting 8 a and 8 b to chambers 2 a and 2 b of the cylinder 2 by means of two controlled non return valves 9 a , 9 b.
  • Each valve 9 a , 9 b comprises a ball applied to a seat by the pressure in the actuator 2 side. The ball may be moved away from the seat by a control pressure.
  • Valve 9 a is positioned between outlets C and E and connects chamber 9 a of the actuator and port A of the servovalve 4 .
  • Valve 9 b is positioned between outlets D and F and connected chamber 2 b of the actuator and port B of the servovalve. Hydraulic links 9 c and 9 d (shown in dotted lines) ensure the control of valves 9 b and 9 a respectively.
  • Valves 9 a and 9 b allow the cylinder 2 to hold its position when controlled in open or closed loop.
  • At least one calibrated nozzle is positioned connecting one of outlet ports A or B of the servovalve 4 to the hydraulic tank 5 .
  • two nozzles 10 a and 10 b are provided.
  • a first nozzle 10 a is connected by ducting 11 a to ducting 8 a and it drains part of the fluid circulating in it towards the tank 5 .
  • a second nozzle 10 b is connected by ducting 11 b to ducting 8 b and it drains part of the fluid circulating in it towards the tank 5 .
  • the nozzles will be constituted by regulating nozzles of well defined calibers.
  • the calibers will be selected so as to ensure a drop in pressure in ducting 8 a or 8 b , which is inactive, without necessarily reducing the discharge in ducting 8 b or 8 a , which controls the movement.
  • Leak sections will be selected for the nozzles, for example, which enable a leak rate of between 4% and 7% of the fluid supplied by the pump 3 .
  • the nozzles 10 a and 10 b do not, therefore, perturb the normal operation of the servovalve 4 since they cause no significant loss in discharge rate in ducting supplied by the pump 3 .
  • the nozzles ensure a drop in the pressure of the fluid in ducting 8 a and 8 b , upstream of the valve 9 .
  • This drop in pressure allows the non-return valves 9 a and 9 b to be stabilized. Indeed, maintaining the pressure in the actuator's chambers is carried out by the balls applied onto their seats by the pressure on the cylinder side. These balls are under the pressure of ducting 8 a and 8 b on the other side of their seat.
  • Laying may thus be carried out accurately when the positioning of the cylinder is servo controlled in a closed loop and that position is held without drift when servo controlled in an open loop.
  • FIG. 2 shows a simplified hydraulic schema of interface plate 13 and FIGS. 3 a , 3 b and 3 c show a particular embodiment of this interface plate.
  • a servovalve 4 is made, in practical terms, in the form of a component incorporating a parallelepipedic base 12 fitted with inlet and outlet openings (or ports) A, B, T and P on a same upper face 12 a.
  • the interface plate 13 is thus also made in the form of a parallelepipedic block a lower face 13 a of which is intended to be applied onto face 12 a of the servovalve.
  • This face has four openings Ta, Aa, Ba and Pa intended to lie respectively opposite openings T, A, B and P of the servovalve.
  • each opening (Ta, Aa, Ba, Pa) of interface plate 13 incorporates a countersink able to house an O-ring. This O-ring will be applied during assembly against face 12 a of the servo vale and will seal it.
  • An upper face 13 b of the plate 13 has four openings Tb, Ab, Bb and Pb to which the different ducting of the hydraulic circuit will be connected.
  • Ducting 8 a and 8 b leading to the cylinder are fastened to openings Ab and Bb, ducting 6 b coming from the pump 3 is fastened to opening Pb and ducting 18 , which returns to the hydraulic tank 5 , is fastened to opening Tb. Fastening is made using appropriate hydraulic connectors.
  • Face 13 b may also be applied against a hydraulic block (not shown) provided with holes corresponding to opening Tb, Ab, Bb and Pb.
  • the latter openings will also be provided with countersinks (not shown) able to house O-rings thereby ensuring sealing with respect to the block.
  • the block will be connected using appropriate ducting to the cylinder, the pump and the tank.
  • the different openings of the lower face 13 a are connected to openings in the upper face 13 b by holes drilled in the material of the plate 13 .
  • opening Ta is connected to opening Tb by drill hole 14
  • opening Aa is connected to opening Ab by drill hole 15
  • opening Ba is connected to opening Bb by drill hole 16
  • opening Pa is connected to opening Pb by drill hole 17 .
  • a first controlled hydraulic leak circuit 19 a is formed by a channel onto which a nozzle 10 a is positioned, which connects drill holes 15 and 14 .
  • the plate moreover, encloses a second leak circuit 19 a formed by another channel onto which is nozzle 10 b is positioned. This second leak circuit 19 b connects drill holes 16 and 14 .
  • the plate 13 allows the servovalve 4 to be converted in an extremely simple manner to incorporate the nozzles proposed by the invention.
  • the hydraulic circuit may thus easily be modified without it being necessary to provide additional ducting.
  • the leak circuits 19 a and 19 b are made in the shape of orthogonal holes. Such an arrangement makes it easier to manufacture the interface plate 13 .
  • the holes are made in two parallel planes.
  • plane AA ( FIG. 3 a ) comprises two orthogonal holes 19 a 1 and 19 a 2 which form the first leak circuit 19 a .
  • Hole 19 a 2 encloses the first nozzle 10 a, made in the form of a screw having a calibrated axial orifice.
  • Plane BB ( FIG. 3 b ) comprises four holes 19 b 1 , 19 b 2 , 19 b 3 and 19 b 4 which are orthogonal two by two and thus form a rectangle. These four holes constitute the second leak circuit 19 b .
  • Hole 19 b 1 encloses the second nozzle 10 b also made is the form of a screw fitted with a calibrated axial orifice.
  • the nozzles 10 a and 10 b merely have to be unscrewed and replaced by nozzles having different leak diameters.
  • the leak diameters of the nozzles will be selected according to the properties of the actuator, the load and the servo control circuit pressure in position.
  • Holes 21 passing right through the interface plate 13 are provided to allow the plate to be fastened onto the servovalve 4 by screws (not shown).
  • This variant allows one of the movements of the cylinder to be accelerated in a preferential manner.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Servomotors (AREA)
US10/896,931 2003-12-23 2004-07-23 Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device Abandoned US20050132876A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR03.15427 2003-12-23
FR0315427A FR2864178B1 (fr) 2003-12-23 2003-12-23 Dispositif de commande en position d'un actionneur hydraulique et plaque interface de servovalve mettant en oeuvre un tel dispositif

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US20050132876A1 true US20050132876A1 (en) 2005-06-23

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US10/896,931 Abandoned US20050132876A1 (en) 2003-12-23 2004-07-23 Position control device for a hydraulic actuator and interface plate for a servovalve implementing such a device

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US (1) US20050132876A1 (fr)
EP (1) EP1548287B1 (fr)
AT (1) ATE428056T1 (fr)
DE (1) DE602004020440D1 (fr)
ES (1) ES2325395T3 (fr)
FR (1) FR2864178B1 (fr)
PL (1) PL1548287T3 (fr)

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Publication number Priority date Publication date Assignee Title
US20100096576A1 (en) * 2008-10-22 2010-04-22 Mark Sommer Valve bleed system
CN104261300A (zh) * 2014-08-12 2015-01-07 四川万冠机电技术有限公司 一种液压千斤顶
US11274752B2 (en) * 2020-01-08 2022-03-15 Sun Hydraulics, Llc Flow control valve with load-sense signal generation

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102625882B (zh) * 2009-07-16 2014-12-24 舍弗勒技术股份两合公司 液压系统

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US2672731A (en) * 1951-08-01 1954-03-23 Electrol Inc Self-contained power actuator
US3184920A (en) * 1963-06-12 1965-05-25 Caterpillar Tractor Co Leakage control for bulldozer pitch jack circuit
US3543647A (en) * 1969-05-02 1970-12-01 Deere & Co Control valve means for a two-way hydraulic cylinder
US4051764A (en) * 1975-06-05 1977-10-04 Hikaru Murata Hydraulic actuating system
US4170279A (en) * 1976-04-30 1979-10-09 Societe Anonyme Potain Pioclain Materiel (P.P.M.) Fluid flow control devices
US20010042435A1 (en) * 1999-08-19 2001-11-22 Porter Don B. Actuator having internal valve structure

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FR2321416A1 (fr) * 1975-08-21 1977-03-18 Dba Dispositif hydraulique d'assistance pour direction de vehicule automobile
JPS5947506A (ja) * 1982-09-09 1984-03-17 Fuji Eng Kk 複合弁

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US2672731A (en) * 1951-08-01 1954-03-23 Electrol Inc Self-contained power actuator
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US4170279A (en) * 1976-04-30 1979-10-09 Societe Anonyme Potain Pioclain Materiel (P.P.M.) Fluid flow control devices
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100096576A1 (en) * 2008-10-22 2010-04-22 Mark Sommer Valve bleed system
EP2179902A3 (fr) * 2008-10-22 2013-01-30 Deere & Company Système pour purger une soupape dans un système hydraulique de véhicule
CN104261300A (zh) * 2014-08-12 2015-01-07 四川万冠机电技术有限公司 一种液压千斤顶
US11274752B2 (en) * 2020-01-08 2022-03-15 Sun Hydraulics, Llc Flow control valve with load-sense signal generation

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FR2864178A1 (fr) 2005-06-24
EP1548287B1 (fr) 2009-04-08
FR2864178B1 (fr) 2006-02-17
EP1548287A1 (fr) 2005-06-29
PL1548287T3 (pl) 2009-09-30
ES2325395T3 (es) 2009-09-03
ATE428056T1 (de) 2009-04-15
DE602004020440D1 (de) 2009-05-20

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