EP4452754A1 - Circuit de commande hydraulique de calage d'aubes de soufflante - Google Patents
Circuit de commande hydraulique de calage d'aubes de soufflanteInfo
- Publication number
- EP4452754A1 EP4452754A1 EP22847589.3A EP22847589A EP4452754A1 EP 4452754 A1 EP4452754 A1 EP 4452754A1 EP 22847589 A EP22847589 A EP 22847589A EP 4452754 A1 EP4452754 A1 EP 4452754A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- pump
- cylinder
- control
- chambers
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
- B64C11/30—Blade pitch-changing mechanisms
- B64C11/38—Blade pitch-changing mechanisms fluid, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2021—Details or component parts characterised by the contact area between cylinder barrel and valve plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
- F04B1/2014—Details or component parts
- F04B1/2042—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
Definitions
- TITLE HYDRAULIC FAN BLADE TIMING CONTROL CIRCUIT
- the invention relates to a system comprising a circuit for hydraulically controlling the setting of turbojet fan blades.
- a turbomachine of the unducted turbojet type, such as an "open rotor” with two counter-rotating fans or even of the USF type for "Unducted Single FAN", that is to say with a single fan followed by non-rotating blading, there is no nacelle surrounding the fan(s).
- the angle of incidence of the blades of a fan is adjustable by a pitch setting system generally making it possible to control the pitch of all the blades according to the same angle (the same pitch).
- the air is admitted into an inlet sleeve 2 to pass through a fan comprising a series of rotating blades 3 before splitting into a central primary flow and a flow secondary surrounding the primary flow.
- the primary flow of the turbojet engine 1 is compressed by low pressure 4 and high pressure 5 compressors before reaching a combustion chamber 6, after which it expands while passing through a high pressure turbine 7 and a low pressure turbine 8, before be evacuated by generating auxiliary thrust.
- the secondary flow is propelled directly by the fan to generate main thrust.
- Each turbine 7, 8 comprises a series of blades oriented radially and regularly spaced around an axis of rotation AX of the engine, these blades being carried by rotor elements of the engine rotating around the axis AX.
- a casing 9 surrounds the blades 3 of the fans and the entire engine to externally delimit the secondary flow.
- the blades 3 of the fan can be of the variable-pitch type, so that the orientation of the blades 3 around their respective radial axes can be adjusted for all of these blades. This timing adjustment is controlled as a function of the operating conditions of the engine, in order in particular to optimize its consumption.
- each blade 3 then comprises a base 11 carried by a rotor element 12 rotating around the axis AX, by means of a pivot connection allowing it to pivot around an axis radial with respect to to the AX axis.
- a central shaft 13 passing through the rotor element 12 and rotating with the latter comprises a disc 14 provided with an outer circumferential groove 16, and each base 11 comprises a stud, not shown, engaged in this groove 16.
- the central shaft 13 with the disc 14 that it carries, along the axis AX thus makes it possible to move the pin of each base 11 longitudinally in order to cause the blade 3 to pivot around its radial axis.
- Figure 2 schematically provides an example of a mechanism among other possibilities that can be implemented, such as connecting rod-crank type systems, so that the setting of the blades 3 depends on the longitudinal position of the central shaft 13 .
- Maintaining the shaft 13 in a given longitudinal position is ensured by means of a hydraulic transfer bearing 15 surrounding the shaft 13, by pressurizing a first chamber 17 and a second chamber 18 of this bearing 15 at different pressures.
- the shaft 13 comprises a first internal channel placing the first chamber 17 in communication with a downstream chamber 21 of a cylinder body 22 carried by the rotor element 12 being rigidly integral with this one.
- This shaft 13 also includes a second internal channel putting the second chamber 18 in communication with an upstream chamber 19 of the cylinder body 22.
- the upstream end of the shaft 13 is housed in the cylinder body 22, and it ends with a plate 23 separating the upstream chamber 19 and the downstream chamber 21 from the cylinder body 22.
- the pressure difference between the first chamber 17 and the second chamber 18 is adjusted to correspond to the force exerted by the blades 3 on the disc 14, so as to maintain the shaft 13 at a given longitudinal position, to block the blades at a given pitch value.
- a decrease or an increase in the pressure of one or the other of the chambers 17 and 18 makes it possible to move the shaft 13 upstream or downstream to modify the pitch angle of the blades, before readjusting the modified pressure to restore an equilibrium in order to maintain the blades at their new pitch angle.
- the pressurization of the chambers 17 and 18 is ensured with a hydraulic pump generating a sufficiently high nominal pressure to allow the blades to be maneuvered over their entire range of pitch angles.
- This nominal pressure which is the highest pressure of the two chambers 17 and 18, thus corresponds to the maximum force that can be exerted by the blades on the disc 14 according to all the possible operating conditions of the engine.
- the object of the invention is to provide a solution for limiting the energy loss of such a fan blade hydraulic control system.
- the subject of the invention is a hydraulic control circuit for a double-acting slewing cylinder for slewing the fan blades of a turbojet engine, comprising an oil tank, a variable displacement axial piston pump comprising a tilting platform controlled by a double-acting control and compensation cylinder comprising a control chamber and a compensation chamber, the orientation cylinder having a first chamber connected to the reservoir, the pump being supplied by the reservoir and having its outlet configured to be able to be connected by a supply line to a second chamber of the slewing cylinder, the other chamber of the slewing cylinder being connected to the reservoir, the chambers of the control and compensating cylinder being both pressurized with a pressure corresponding to the outlet pressure of the pump, and in which the control and compensation chambers are arranged to increase the inclination of the plate in order to increase the displacement of the pump when the pressurization pressure of these chambers increases.
- the pressure delivered by the pump is adjusted to the necessary and sufficient value to counter the forces exerted by the blades on the double-acting cylinder, which makes it possible to significantly reduce the value of this pressure to reduce both the energy consumption of the pump and the hydraulic leaks in the circuit.
- the invention also relates to a circuit thus defined, in which the pump has its outlet connected to a distributing valve by the supply line to a distributing valve itself connected to the first and second chambers of the orientation cylinder are connected to the distributor valve, in which the compensation chamber of the pump is connected to the outlet of the pump, in which the control chamber of the pump is connected to the second chamber of the slewing cylinder, in which the valve distributor can occupy a position in which it connects on the one hand the supply pipe to the second chamber of the orientation cylinder which is connected to the pump control chamber, and on the other hand the first chamber of the orientation to the tank.
- the invention also relates to a circuit thus defined, in which the distributing valve can occupy a position in which the pump and the reservoir are isolated from the first and second chambers of the orientation cylinder.
- Another subject of the invention is a circuit thus defined, comprising a drain line connecting the supply line to the reservoir via a non-return valve.
- the invention also relates to a circuit thus defined, in which the control chamber has a larger useful section than the compensation chamber.
- the invention also relates to a turbojet engine comprising a circuit thus defined and variable-pitch fan blades which are controlled with this circuit.
- FIG 1 is a longitudinal sectional view of a known turbofan engine
- FIG 2 is a schematic view of a known hydraulic fan blade pitch adjustment system
- FIG 3 is a longitudinal section view schematically representing a variable displacement axial piston pump
- FIG 4 is a front view of a variable displacement axial piston pump distribution glass
- FIG 5 is a schematic view of the control circuit according to the invention when its dispensing valve occupies a first position
- FIG 6 is a schematic view of the control circuit according to the invention when its dispensing valve occupies a second position.
- an axial piston pump 26 comprises a drive shaft T1 which is rotated by a shaft of the turbojet that this pump equips.
- This shaft Tl rotates around an axis AP and it carries a barrel 28 to which it is rigidly secured, this barrel here carrying two pistons 29, 31.
- the piston 29 is slidably mounted in a corresponding cylindrical chamber 32 of the barrel 28 to be mobile in translation in this chamber in the direction AP.
- the piston 31 is, in the same way, slidably mounted in another cylindrical chamber 33 of the barrel 28.
- This pump also comprises a tilting plate 34 which is carried by fixed elements of the pump 26 while being capable of pivoting around an axis of rotation AR normal to the axis AP.
- the piston 29 has a free end protruding from the barrel 28 which is equipped with a ball 36 resting on the plate 34 via a pad 37.
- the piston 31 has a free end equipped with a ball 38 resting on the plate 34 via another shoe 39.
- a return spring 41 located in chamber 32 continually tends to pull piston 29 out of this chamber so that its free end is kept flat against plate 34 at all times.
- return spring 42 is arranged in chamber 33 to keep the end of piston 31 pressed against plate 34.
- This pump further comprises a distribution glass 43 attached to the face of the barrel 28 which is opposite the pistons along the axis AP.
- This glass 43 which is a fixed element of the pump, and which appears alone in FIG. 4, is crossed by the shaft T1 and comprises an oil inlet port 44 in the shape of an arc of circle extending over a little less than half a turn, and an oil discharge port 46 also extending over a little less than a half turn, being arranged diametrically opposite to the intake port 44.
- each chamber 32, 33 is terminated on the side opposite the piston it houses, by a channel passing through the barrel to be able to be placed in communication with one or the other of the slots 44, 46 of ice cream 43.
- the intake port 44 is connected to a supply oil reservoir of the pump, at atmospheric pressure, and the discharge port 46 is connected to an outlet conduit of the pump.
- each piston is deployed to suck oil into the entire phase of rotation where its chamber communicates with the port 44, and it retracts to deliver pressurized oil through the port 46 throughout the phase where its chamber communicates with this other port 46.
- a pump 26 generally comprises a greater number of axial pistons housed in its barrel, such as for example five, seven or nine pistons.
- the inclination of the plate 34 determines the stroke of movement of each piston, so that the adjustment of this inclination makes it possible to adjust the displacement of the pump, that is to say its flow per barrel turn.
- the inclination of the plate 34 is adjustable by means of a control and compensation actuator 47 which extends parallel to the axis AP and at a distance from it.
- the plate 34 is itself mounted tilting around an unmarked axis which intersects the axis AP while being oriented perpendicular to a plane passing through the axis AP and through the cylinder 47.
- the jack 47 comprises a body 49 in which slides a rod terminated by a plate 51 separating this body 49 into a control chamber 53 which is opposite to the rod, and a compensation chamber 54 through which this rod passes.
- a return spring 56 is housed in the control chamber, this spring 56 having one end resting on the plate and its other end resting on the bottom of the body 49. This spring 56 tends continuously to deploy the cylinder, to bring out its rod, and this rod has its free end resting on one face of the plate 34.
- the compensation chamber 54 of the cylinder 47 is pressurized by a tapping of oil leaving the pump 26, so that it is continuously at the outlet pressure of the pump 26.
- control chamber 53 is pressurized to another pressure value, so that once in service, the pump rotates with a flow rate value, resulting from the inclination of its plate, which is conditioned by the pressures prevailing in the two chambers 53 and 54.
- the chambers 53 and 54 are depressurized, and the plate resumes an inclined position due to the return spring 56.
- control chamber 53 of the cylinder 47 is also pressurized with a pressure corresponding to the outlet pressure of the pump. Due to the presence of the rod passing through the compensation chamber 54, the useful section of the chamber 54 is less than the useful section of the chamber 53.
- the axial piston pump with variable displacement 26 is integrated into the control circuit 57 represented in FIG. 5, to ensure the pressurization of a first chamber 58 upstream or of a second chamber 59 downstream of an orientation cylinder. 61 acting on the longitudinal position of a central shaft of an engine. This makes it possible to maintain the blades at a predetermined pitch angle by maintaining this shaft at a given position and to modify the pitch angle of these blades by moving this shaft.
- This cylinder 61 is carried by the central shaft which rotates while being supplied by the control circuit which is carried by fixed elements of the engine, thanks to a hydraulic transfer bearing 62 surrounding the central shaft, this bearing being the seat hydraulic leaks.
- this circuit 57 includes an oil tank 63 which is connected to the pump 26 to supply it, and the pump 26 has its outlet connected to a supply pipe 64 connected to a distributor valve 66 at two positions.
- the compensation chamber 54 is pressurized to the outlet pressure of the pump by being connected to the pipe 64 by a tapping.
- This distributor valve 66 which here is a distributor drawer, is connected to a first chamber of the transfer bearing 62 via an upstream pipe 67, and this first chamber of the bearing 62 directly supplies the first chamber 58 of the orientation cylinder 61.
- the distributing valve 66 is connected to a second chamber of the transfer bearing 62 via a downstream pipe 69, and this second chamber of the bearing 62 directly supplies the second chamber 59 of the jack 61.
- This downstream pipe 69 is further connected by a pipe of control 71 to chamber 54 of cylinder 47.
- the distributor valve 66 occupies a first position corresponding for example to a cruising flight situation.
- the schematic representation of this valve 66 in the figure shows in this first position a crossing of the two fluid circuits inside the valve between the two inlets and the two outlets of the body of the valve.
- the connections between the two outlets of the valve 66 and the upstream pipe 67 as well as the downstream pipe 69 must be permuted accordingly with respect to the diagram of FIG. 5.
- the outlet of the valve 66 connected to the downstream pipe 69 will then be substantially opposite the inlet of the valve connected to the supply pipe 64.
- the distributor valve 66 connects on the one hand the outlet of the pump 26 to the second chamber 59 of the jack 61 and to the chamber 53 of the control jack 47, and on the other hand a purge line 72 to the first chamber 58 of the jack 61 and to chamber 54 of control jack 47.
- This purge line 72 opens into reservoir 63 which may optionally be pressurized.
- the increase in the output flow rate of the pump 26 makes it possible to increase the pressure in the chamber 59 to compensate for the increase in the force exerted by the blades as well as the increase in the leaks in the bearing 62 resulting from the increase depression.
- the hydraulic control circuit 57 thus makes it possible to automatically regulate the pressure in the orientation cylinder 61 in order to adapt it continuously to the value of the forces exerted by the fan blades.
- the pitch of the blades does not change when the forces which they exert (which correspond to the aerodynamic forces which they undergo) fluctuate, and the control pressure used is as low as possible since it is continuously adjusted to this force. This makes it possible to limit the consumption of the pump, and thereby to optimize the efficiency of the motor.
- the circuit 57 also includes a drain line 73 of the supply line 64 which connects the latter to the reservoir 63, and which includes a non-return valve 74 which is here a ball valve.
- a non-return valve 74 which is here a ball valve.
- the distributing valve 66 which occupies a first position in the configuration of FIG. 5 can also occupy a second position corresponding to FIG. 6, and in which it closes all communication between the supply pipe 64 and the cylinder 61, and all between purge line 72 and cylinder 61.
- the distributing valve 66 When the distributing valve 66 is switched from its first position to its second position, the pressures drop progressively in the upstream pipe 67 and in the downstream pipe 69 due to leaks in the transfer bearing 62. Consequently, the pressure also drops in the control line 71 and therefore in the control chamber 53, while the pressure remains high in the compensation chamber. Under these conditions, the plate 34 of the pump is balanced at an angular position close to the normal to the axis AP, the pump 26 then having a substantially zero flow rate. Given the leaks in the bearing 62, the cylinder 61 is not blocked, it is likely to be moved at a relatively slow speed if forces are applied to it.
- the control circuit has been described for operation ensuring that the blades are maintained at a given pitch angle, including when the forces undergone and exerted by these blades fluctuate, while generating a minimum pressure, that is to say necessary and sufficient. to maintain them in the given position.
- This control circuit 57 also makes it possible to modify the pitch angle of the blades. More particularly, the distributing valve 66 which has been described according to an operation schematically of the “all-or-nothing” type is advantageously a valve of the progressive type to suit a concrete application.
- this valve 66 When this valve 66 is in its first position, it can also be controlled to provide the fluid with a more or less large passage section. If it is controlled to offer a maximum passage section, the entire flow delivered by the pump is transferred to chamber 59, so that the pressure in this chamber reaches a value greater than that necessary to balance the force exerted by the blades, which generates a displacement of the ram which deploys thereby modifying the pitch angle of the blades.
- the valve In the first position, if the valve is controlled to offer the fluid a partial passage section, corresponding to a predetermined value, the flow transferred to the chamber 59 is lower, to generate in the chamber 59 a pressure value which can be provided just sufficient to balance the forces exerted by the blades, so as only to ensure their maintenance at the pitch angle which they occupy.
- the control and piloting of the distributing valve are ensured from an engine computer (Fadec) which continuously adjusts the signals sent to this valve according to the operating conditions of the engine.
- Fadec engine computer
- the invention makes it possible to regulate the counterpressure of the variable-displacement axial piston pump with a pressure which depends on the forces applied to the actuator for controlling the pitch of the blades, instead of regulating it to a fixed value. high. It has been explained in the context of the control of variable-pitch fan blades of a turbojet engine, but it can be applied to the control system of variable-pitch blades of other types of engines such as turboprops .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2114428A FR3131273A1 (fr) | 2021-12-23 | 2021-12-23 | Circuit de commande hydraulique de calage d’aubes de soufflante |
| PCT/FR2022/052433 WO2023118725A1 (fr) | 2021-12-23 | 2022-12-20 | Circuit de commande hydraulique de calage d'aubes de soufflante |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4452754A1 true EP4452754A1 (fr) | 2024-10-30 |
Family
ID=81327090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22847589.3A Pending EP4452754A1 (fr) | 2021-12-23 | 2022-12-20 | Circuit de commande hydraulique de calage d'aubes de soufflante |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12522347B2 (fr) |
| EP (1) | EP4452754A1 (fr) |
| CN (1) | CN118434631A (fr) |
| FR (1) | FR3131273A1 (fr) |
| WO (1) | WO2023118725A1 (fr) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118074431B (zh) * | 2024-04-19 | 2024-08-06 | 东莞市天一精密机电有限公司 | 伺服电机 |
| CN121184395B (zh) * | 2025-11-24 | 2026-03-20 | 中国航发商用航空发动机有限责任公司 | 具有变桨距机构的涡轮发动机的风扇模块、涡轮发动机、桨距调节方法 |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2865460A (en) * | 1954-06-17 | 1958-12-23 | United Aircraft Corp | Pitch control servo system for an aeronautical propeller |
| US2928474A (en) * | 1956-07-17 | 1960-03-15 | Rolls Royce | Supplying pressure oil to pitch change mechanism of air-screw driven by gasturbine engine |
| EP0367476A1 (fr) * | 1988-11-02 | 1990-05-09 | Vickers Systems Limited | Pompes à déplacement variable |
| GB9119448D0 (en) * | 1991-09-12 | 1991-10-23 | Vickers Systems Ltd | System controls |
| FR2831226B1 (fr) * | 2001-10-24 | 2005-09-23 | Snecma Moteurs | Actionneur electrohydraulique autonome |
| US7155909B2 (en) * | 2003-05-15 | 2007-01-02 | Kobelco Construction Machinery Co., Ltd. | Hydraulic controller for working machine |
| JP3922577B2 (ja) * | 2003-07-14 | 2007-05-30 | 株式会社不二越 | 両回転形液圧ポンプ装置 |
| WO2006040090A1 (fr) * | 2004-10-08 | 2006-04-20 | Stabilus Gmbh | Entrainement lineaire |
| JP4365870B2 (ja) * | 2007-03-30 | 2009-11-18 | 三菱重工業株式会社 | 流体圧アクチュエータ |
| CN101842590B (zh) * | 2007-08-20 | 2012-12-05 | 罗伯特-博世有限公司 | 具有可调静液压机的液压系统 |
| JP2009264525A (ja) * | 2008-04-28 | 2009-11-12 | Nabtesco Corp | 作動流体供給装置及び電動アクチュエータ |
| US8277182B2 (en) * | 2009-07-02 | 2012-10-02 | Hamilton Sundstrand Corporation | Remote pitch controller for a variable pitch propeller |
| JP5368943B2 (ja) * | 2009-11-10 | 2013-12-18 | 川崎重工業株式会社 | 油圧制御装置 |
| JP5666233B2 (ja) * | 2010-10-08 | 2015-02-12 | ナブテスコ株式会社 | 航空機アクチュエータの油圧装置 |
| FR2978953B1 (fr) * | 2011-08-08 | 2013-09-20 | Snecma | Systeme de commande hydraulique de l'orientation de pales de soufflante |
| FR2993940B1 (fr) * | 2012-07-24 | 2018-11-09 | Poclain Hydraulics Industrie | Circuit de commande hydraulique avec securite en cas de coupure de commande |
| JP6147021B2 (ja) * | 2013-02-22 | 2017-06-14 | 三菱重工業株式会社 | 流体圧ポンプ |
| JP6170755B2 (ja) * | 2013-06-18 | 2017-07-26 | 住友精密工業株式会社 | 電動油圧アクチュエータ |
| FR3011288B1 (fr) * | 2013-09-30 | 2018-02-16 | Poclain Hydraulics Industrie | Commande de cylindree de pompe avec pilotage par pression |
| WO2016118887A1 (fr) * | 2015-01-23 | 2016-07-28 | Levant Power Corporation | Procédé et appareil de commande d'un actionneur |
| US20170167507A1 (en) * | 2015-12-09 | 2017-06-15 | General Electric Company | Method and system for a pitch change mechanism hydraulic fluid transfer sleeve |
| FR3053413B1 (fr) * | 2016-06-29 | 2019-03-29 | Airbus Helicopters | Double circuit hydraulique a regulation de pression |
| US11118610B2 (en) * | 2017-08-29 | 2021-09-14 | The Boeing Company | Low profile electro-hydrostatic actuator |
-
2021
- 2021-12-23 FR FR2114428A patent/FR3131273A1/fr active Pending
-
2022
- 2022-12-20 WO PCT/FR2022/052433 patent/WO2023118725A1/fr not_active Ceased
- 2022-12-20 US US18/721,701 patent/US12522347B2/en active Active
- 2022-12-20 CN CN202280085436.8A patent/CN118434631A/zh active Pending
- 2022-12-20 EP EP22847589.3A patent/EP4452754A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN118434631A (zh) | 2024-08-02 |
| US12522347B2 (en) | 2026-01-13 |
| WO2023118725A1 (fr) | 2023-06-29 |
| FR3131273A1 (fr) | 2023-06-30 |
| US20250051004A1 (en) | 2025-02-13 |
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