WO2015022464A1 - Turbomachine équipée d'un ensemble pour commander la variation du pas d'une hélice - Google Patents
Turbomachine équipée d'un ensemble pour commander la variation du pas d'une hélice Download PDFInfo
- Publication number
- WO2015022464A1 WO2015022464A1 PCT/FR2014/052039 FR2014052039W WO2015022464A1 WO 2015022464 A1 WO2015022464 A1 WO 2015022464A1 FR 2014052039 W FR2014052039 W FR 2014052039W WO 2015022464 A1 WO2015022464 A1 WO 2015022464A1
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- WO
- WIPO (PCT)
- Prior art keywords
- turbomachine
- actuator
- downstream
- propeller
- piston
- Prior art date
Links
- 230000003068 static effect Effects 0.000 claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims description 38
- 238000005192 partition Methods 0.000 claims description 16
- 230000007246 mechanism Effects 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 5
- 238000013519 translation Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 13
- 239000003638 chemical reducing agent Substances 0.000 description 10
- 230000002441 reversible effect Effects 0.000 description 7
- 238000005461 lubrication Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 210000003462 vein Anatomy 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/04—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor
- F02C3/107—Gas-turbine plants characterised by the use of combustion products as the working fluid having a turbine driving a compressor with two or more rotors connected by power transmission
-
- 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
-
- 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
- B64C11/46—Arrangements of, or constructional features peculiar to, multiple propellers
- B64C11/48—Units of two or more coaxial propellers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
- F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
- F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
- F02K3/06—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type with front fan
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D27/00—Arrangement or mounting of power plants in aircraft; Aircraft characterised by the type or position of power plants
- B64D2027/005—Aircraft with an unducted turbofan comprising contra-rotating rotors, e.g. contra-rotating open rotors [CROR]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- the present invention relates to an assembly for controlling the variation of the pitch of a turbomachine propeller and more particularly, although not exclusively, the application of such an assembly to a turbomachine doublet upstream and downstream counter-rotating propeller propellers, the variation of pitch of the downstream propeller being controlled by said assembly.
- turbomachines propulsion propellers concerned are turbine engines designated by the English expression “open rotor” or “unducted fan”, which turboshaft engines are the subject of numerous developments in particular because of their lower fuel consumption compared to multi-stream turbofan engines in service on planes.
- the architecture of the open rotor turbine engines differs from that of the turbojet engines in that the fan is no longer internal, but external and consists of two coaxial and counter-rotating propellers that can be located upstream or downstream of the generator. gas.
- turboprop engine comprising a turbomachine and a propeller, said turbomachine being able to drive said propeller in rotation by a gearbox.
- a turboprop engine also includes a pitch management system of said propeller, to manage the propeller blade pitching movement.
- a turbine engine 1 with twin counter-rotating propellers upstream 2 and downstream 3 is shown schematically with reference to Figure 1 and comprises mainly, along a central longitudinal axis A, two separate parts.
- a "gas generator” part G is situated inside a fixed cylindrical nacelle 4 with a structural casing 5, carried by the structure of the aircraft (like the rear part of the fuselage of an airplane), and a part “Propulsion” P with the pair of contra-rotating propellers 2, 3 constituting the unshirred fan ("open rotor").
- This part P extends, in this example of a turbine engine, the gas generator part G and the nacelle 4.
- the gas generator part G of the turbine engine 1 usually comprises, from upstream to downstream in the direction of flow, with respect to the axis A, of the gas flow F entering the nacelle 4 of the turbine engine, one or two compressors 7 according to the architecture of the single or double-body gas generator, an annular combustion chamber 8, one or more turbines 9 at a distinct pressure according to said architecture, one of which of them drives, through a differential gearbox or epicyclic gearbox 10 (designated by the acronym PGB for Power Gear Box) and contrarotatively, the concentric and coaxial shafts 11 and 12 of the two upstream propellers 2 and downstream 3, aligned along the axis A of the turbine engine.
- the shaft 12 of the downstream propeller, integral with the ring gear of the gearbox, is internal with respect to the then outer shaft 11 of the upstream propeller, integral with the planet carrier of said gearbox.
- a nozzle 13 usually terminates the turbine engine 1.
- the two counter-rotating propellers are arranged in radial parallel planes, perpendicular to the axis A, and comprise rotary ring housings.
- polygonal 14, 15 extending the nacelle and in which are formed radial cylindrical housings 16, 17 regularly distributed for receiving the feet or pivots 18, 19 of the blades 20, 21 of the propellers.
- the ring housings 14, 15 are respectively connected to the drive shafts 11, 12 rotating in opposite directions of rotation through the turbine and the gear 10, the latter imposing in particular the opposite direction of rotation to the two propellers.
- the air flow F entering the turbine engine 1 is compressed, then mixed with fuel and burned in the combustion chamber 8.
- the generated combustion gases then pass into the turbine portion 9 to drive in reverse rotation , via the epicyclic reducer 10, the propellers 2, 3 which provide most of the thrust.
- the combustion gases are expelled through the nozzle 13 thus increasing the thrust of the turbine engine 1.
- a suitable fluidic control assembly 25 makes it possible to vary the pitch of the blades during flight, that is to say the pitch of each counter-rotating propeller.
- the pivots 18, 19 of the radial blades are rotated by their respective assemblies 25 to rotate, relative to their B-axes substantially perpendicular to the longitudinal axis A, in the radial housings 16, 17.
- the blades can rotate from + 90 ° to 30 ° for flight phases, from + 30 ° to -30 ° C.
- radially arriving lines or service lines 23, such as fluid supply lines (in application, hydraulic) and electrical lines intended in particular for the prior art assembly the latter usually comprises from upstream to downstream, a cylindrical sheath 26 serving to convey the supply lines 23, then a fluidic flow control system 27 defining the terminals of the operation of the geometry of the blades of the propeller, then a linear actuator 28 transmitting the axial movement imposed by the system 27 by concentric tubes 36, 37 whose internal passages put in communication, according to the selected phases, the chambers of the system to those of actuator delimited by a piston.
- a ⁇ actuator is also associated a connecting mechanism 29 connecting the movable actuator portion to the pivots 19 of the blades 21 and thus transforming the sliding of the actuator piston (imposed by the system via the tubes), in a rotation of the blades of the propeller downstream around the axes.
- the actuator 28 is located substantially vertically above the hub of the downstream propeller 3 to facilitate the transmission of movement of its sliding mobile part to the rotary pivots of the blades of the downstream propeller.
- the fluid flow control system 27 will be designated FFS system corresponding to the acronym for Flight Thin Stop for the above three operating phases of the set.
- FFS system corresponding to the acronym for Flight Thin Stop for the above three operating phases of the set.
- the cylindrical sleeve 26 is mechanically connected, upstream, to the static casing 24 of the gas generator G and, downstream, to the pitch control system FFS 27 leading to the actuator 28.
- the sheath is housed, along the axis A, in the internal shaft 12 also passing inside the epicyclic reduction gear 10.
- three lubricant supply lines (oil) 23 ' run inside the sheath 26. These lines 23' are fed from a fluid source of lubricant not shown, located in the structural housing 5, nacelle side, and pass through radial arms to end in the gas generator part G.
- lines 23 'of the FFS control system 27 pass, in the sheath 26, lines of lubrication 23 "for different bearings, such as the inter-shaft bearing 30 shown partly in Figure 2, and 31 between the sleeve 26 and the internal shaft 12 of the downstream propeller, as well as electrical service lines 23 "'for the sensors of the actuator 28 and other downstream electrical equipment.
- the very integration of the gearbox 10 is problematic because of the large space occupied by the sheath 26 at the heart of the turbine engine 1.
- the present invention aims to provide a solution to these various problems.
- a fluidic control assembly for varying the pitch of a turbomachine propeller, such as a turbomachine comprising an epicyclic reduction gear driven by the planetary shaft connected to a power turbine of the turbomachine, said assembly connecting an upstream static casing of the turbomachine, in which fluidic and electrical supply lines arrive, to the blades of the downstream propeller, characterized in that it comprises from upstream to downstream a fluidic flow control system integral with the casing static, defining the operating terminals of the geometry of the blades of the downstream propeller and adapted to be connected to the supply lines, then a linear actuator with two chambers separated by a piston whose sliding is imposed by the control system and allows rotation of the blades, said system being connected to the actuator via two tubes concentric housed in the planetary shaft of the epicyclic reduction gear and delimiting two fluidic passages in respective connection with the two chambers of the actuator.
- the assembly thus has a small footprint and makes it possible to have a reduction gear of reduced diameter.
- Provisions comprising concentric tubes are known from documents WO 98/22340 and GB-2254893-A but in the field of conventional propellers, without any consideration of the problems of size of the reducer.
- the fluidic control system is arranged inside the static casing and comprises a hollow body integral with the casing and inside which are received the two concentric sliding tubes respectively external and internal, and chambers internal boundaries delimited by the body and the tubes and in respective connection with the supply lines for controlling, by the sliding of the tubes and the piston of the actuator, the orientation of the blades of the propeller, according to the operating phases of the the turbomachine.
- the hollow body comprises two adjacent chambers separated by a partition and traversed by the outer tube, the two chambers communicating, through an opening on the outer tube, with the annular passage provided between the two tubes and opening into one actuator chambers on one side of the piston, and a third chamber in connection with the fluid passage of the inner tube and opening into the other chamber of the actuator, on the other side of the piston.
- the two outer and inner sliding tubes are guided and held together by an annular sleeve, at one of their ends, while their other ends are connected to the piston of the actuator.
- the assembly is arranged in a sleeve integral with the fixed cylindrical body of the fluidic control system at its upstream end, the sleeve is supported along its length by at least one bearing, and the sleeve is also housed in the planetary shaft of the epicyclic reducer.
- a sheath differs from the prior art in that it does not contain exactly the same feed lines.
- the word sheath in the following description refers to such a sheath.
- the sleeve then serves as an intermediate static shaft between the FFS system and the actuator protecting the connecting tubes and fluid supply extending between the system and the actuator.
- the bearing lubrication lines and / or electrical can be arranged along the outside of the fork because of the surrounding space gained by reducing the diameter of the sheath.
- the connection of lines with parts and other equipment is visible and therefore safe.
- the sheath has, on the outer periphery, radial extra thicknesses, local, for the support of a bearing, between which can pass, along the sheath, hydraulic and / or electrical supply lines in the direction of bearings and / or equipment.
- the actuator is fixed in translation and secured to a rotating casing of the propeller, and the sliding piston to which the tubes of the control system are connected, is connected to a link mechanism or analogues articulated to the pivots of the blades of the propeller to be oriented, mounted on the ring casing thereof.
- bearings are provided on the one hand between the outer tube and the piston and, on the other hand, between the inner tube and the piston.
- the static casing comprises an outer casing and therein an aerodynamic casing for the passage of the gas flow and having radial arms for the passage of the supply lines towards the control system, between the casing aerodynamic system and the control system being provided a manifold for joining the supply lines on a cylindrical support and define with the latter and upstream and downstream transverse partitions, a ventilation chamber with the gas flow and, under the support, an enclosure lubricant recovery from the control system.
- the invention also relates to a turbomachine, in particular for an aircraft, of the type comprising a gas generating part and a propulsion part with a doublet of upstream and downstream coaxial and counter-rotating propellers, and assemblies for controlling the pitch variation of the upstream and downstream propellers. depending on the operating phases of the turbomachine.
- the assembly for controlling the variation of the pitch of the downstream propeller is as defined above.
- FIG. 1 is a diagrammatic view in longitudinal section of a turbine engine with a pair of counter-rotating propellers, respectively upstream and downstream, and schematically incorporating a fluidic control assembly for the variation of the pitch of the downstream propeller, according to the prior art.
- FIG. 2 is an enlarged axial sectional view of FIG. 1 showing the fluidic control assembly according to the prior art with the arrangement of its components, comprising a cross-section CP showing the hydraulic and electrical supply lines passing through the sheath and a cross section of a blade 21 showing its profile.
- Figure 3 is an axial sectional view, according to the invention, of the fluidic control assembly for the variation of the pitch of the downstream propeller, showing in particular the arrangement of its components.
- Figure 4 shows, in partial perspective, a static housing with the feed lines therethrough and leading to the FFS system of the control assembly, located within this housing.
- Figure 5 is a longitudinal sectional view of the static housing and the FFS system.
- Figure 6 shows, in longitudinal section, the sheath according to the invention forming part of the control assembly, arranged between the FFS system and the linear actuator.
- FIG. 7 shows, in longitudinal section, the linear actuator such as a jack, to which the tubes of the FFS system are connected, and whose sliding causes the angular variation of the blades of the downstream propeller by an intermediate linking mechanism.
- the linear actuator such as a jack
- FIG. 3 representing, according to the invention, the control unit 25 for modifying the pitch of the blades 21 of the downstream propeller 3 of the turbine engine 1, the fluidic control system (hydraulic) FFS 27, the sleeve 26 and the linear actuator 28, such as a hydraulic cylinder, are arranged in this order along the axis A, from upstream to downstream of the turbine engine 1 relative to the direction of the gas flow, from the static housing 24 from which the lines come.
- of servitude 23 lubricant supply and electric cylinder 28 which is associated with a link mechanism 29 (see Figure 2) which can rotate the blades on their pivots and thus vary their setting according to the operating phases requested.
- the FFS system 27 comprises structurally, as shown in FIGS. 3, 4 and 5, a hollow body 35.
- This hollow body 35 is of generally cylindrical shape with a through-passage and centered on the axis A.
- the body 35 is advantageously attached to the static housing 24.
- Inside the passage of the body 35 are provided two tubes concentric sliding respectively 36 external and internal 37.
- Two adjacent chambers left 38 and right 39 are formed between the body and the outer tube being separated by a transverse partition 40 corresponding to an internal shoulder of the body which also contributes to guiding the outer tube by relation to the body.
- Oil supply lines (or lines) 23 ' are connected to the body to communicate with the chambers.
- the supply line 23 'of the left chamber 38 is not visible, only the access port 41 to this chamber and formed in the body is shown.
- the supply line 23 'of the right chamber 39 is shown with the connector 42 attached to the body.
- an oblong opening 44 which is, in the illustrated representation corresponding to the flag position ( Figure 4), in the left chamber 38, and which gives in an annular passage 45 provided between the two tubes.
- This oblong opening 44 has a length greater than the length of the partition wall 40, to allow the passage of a quasi-reverse position of the blades, to a reverse position of the blades.
- the change of position is obtained by a set of pressures between the two chambers 38 and 39 placed in communication by the oblong opening 44 thanks to the sliding of the tubes.
- the two chambers 38, 39 communicate, through an opening 44 formed on the outer tube 36, with the annular fluid passage 45 which is provided between the two tubes 36, 37 and which opens into one of the chambers of the actuator 28, namely the upstream chamber 72, on one side of a piston 71 of the actuator 28.
- a third chamber 47 is provided in the body 35 in connection with the central fluid passage 48 of the inner tube 37, which opens into the other chamber 73 of the actuator, on the other side of the piston 71.
- a cover 49 is fixed on the upstream side of the body and envelops the upstream ends 36 ', 37' of the tubes 36, 37, which project from the body.
- a line or hydraulic supply pipe 23 'coming from the housing is connected to the hood by an access orifice 34 formed in this one.
- the oil arriving via the line 23 ' communicates through the orifice 34 with an annular space defining the third chamber 47 delimited between the cover 49 and the outer tube 36 to arrive at the central fluid passage 48 of the inner tube.
- a guide sleeve 46 between them located at the upstream ends 36 ', 37' of the tubes surrounded by the cover.
- the sleeve 46 is connected to the bottom of the cover 49 and holes 90 are formed in the portion of the sleeve projecting from the ends of the tubes.
- downstream ends 36 ", 37" of the tubes are connected to the piston of the cylinder, as will be seen later.
- the static casing 24, through which the various hydraulic and electrical lines 23 (the latter in the form of a harness 23 '") issuing from the structural casing 5, comprise, radially from the outside, inwardly, an outer casing 50, an aerodynamic casing 51 and a manifold 52.
- the outer casing 50 defines the outer casing geometric line and makes it possible to connect the service lines 23 coming from upstream equipment of the turbine engine.
- the aerodynamic casing 51 defines the outer cylindrical walls 53 and internal 54 inner vein 55 of the turbines and has radial arms 56, 57 connecting the walls therebetween. As can be seen in FIG. 4, thick radial arms 56 enable the various lines 23 to be passed inside and thin radial arms 57 provide the aerodynamic function for the orientation of the air flow in the vein 55.
- annular collector 52 Between this aerodynamic casing 51 and the FFS system 27 is the annular collector 52 which makes it possible to join and hold on an intermediate cylindrical support 58, the service lines 23 ', 23 ", 23"' visible in FIG. thick radial arms 56.
- the annular collector 52 conveys the service lines 23 ', 23 ", 23"' to the assembly 25, in particular to the body of the system while minimizing their bulk.
- An upstream transverse partition 60 and a downstream transverse partition 61 are fixedly attached to the cylindrical support 58. As shown in FIGS.
- the upstream partition 60 is fixed at its outer periphery to the aerodynamic casing 51, while its inner periphery is integral with the cover 49 of the FFS system 27, and the downstream partition 61 is fixed at the outer periphery to the aerodynamic casing 51 and secured to the inner periphery of the body 35 of the FFS system.
- two respectively external and internal annular enclosures 63 are formed between the partitions 60, 61 and the support 58.
- the external enclosure 62 in communication with the vein 55, forms a ventilation enclosure for the immediate environment and the internal enclosure 63 forms an oil recovery chamber that can come from the FFS system 27.
- the downstream partition 61 also makes it possible to define the purge for cooling the disks of the turbine, and also to define the boundary between the static housing 24 and the FFS system 27.
- the FFS system 27 is housed inside the collector (static housing 24), so that it is as close to the lines to be connected to the best, and that this new arrangement of all 25 becomes axially compact, as can be seen by comparing FIG. 2, where the housing 25, the sleeve 26, the FFS system 27 and the actuator 28 are aligned one after the other, with FIG. where, from upstream to downstream, the housing and the FFS system 27 are integrated into one another, then followed by the sleeve 26 and the actuator 28.
- the three oil supply lines 23 'intended for the three chambers 38, 39, 47 of the FFS system 27 are advantageously directly connected thereto, from the manifold 52.
- these lines which have a significant diameter (FIG. because of the flow rates and pressures required, no longer pass through the sleeve 26.
- the tubes 36, 37 defining the hydraulic passages for controlling the cylinder.
- These concentric tubes 36, 37, one in the other are thus diametrically smaller (diameter equal to the outer tube) than the three separate feed lines 23 '(arranged side by side, section CP of FIG. 2) traveling through the sheath according to the prior art.
- the sleeve 26 has a much smaller diameter.
- the diameter of the sheath 26 for an architecture of the prior art (FIG. 2) changes from a diameter of 100 mm to a diameter of 60 mm with the new architecture of the assembly according to the invention ( Figure 3).
- the sleeve 26 is static and it comprises an upstream end 26 ', fixed to the partition or flange downstream 61 of the collector, which surrounds the cylindrical body 35 of the FFS system 27.
- the sleeve 26 has a downstream end
- the sleeve 26 is in the vicinity of the cylinder 28, without being connected thereto, since, as will be seen later, in the embodiment of the fluidic control assembly 25 of the invention, the linear cylinder 28 is also rotatable, integral with the rotor carrying the downstream propeller 3.
- this sleeve 26 (greater than one meter) between the static housing 24 and the downstream propeller 3, at least one bearing supports the sleeve in the middle portion thereof.
- FIG. 3 axially truncated because of this length
- FIG. 6 that local radial over-thicknesses 67 are advantageously provided in a regularly distributed manner on the outside of the sheath 26.
- the bearing 31 Around the overthickness is mounted the bearing 31 by its inner ring 3, the outer ring not shown being in contact with the internal drive shaft 12 of the downstream propeller 3.
- the gear 10 cooperating by the sun shaft 10 with the turbine shaft 32 which surrounds the sleeve 26, and the shafts 11, 12 of the propellers, connected to the reducer.
- the cylinder or external part 70 thereof is fixed in translation, along the axis A, and integral with a rotary casing not visible from the turbine engine, in this case a rotating casing of the downstream propeller.
- the piston 71 of the cylinder, mobile in translation by the FFS system 27, separates the interior of the cylinder into two chambers respectively upstream 72 and downstream 73 and is also rotatable, as will be seen hereinafter.
- the upstream chamber 72 of the cylinder opens the annular passage 45 of the concentric tubes of the system 27.
- the outer tube 36 is surrounded at its end 36 "housed in the upstream chamber, an outer cover 74 which is fixed to the piston by elements not shown Holes 75 formed in the hood communicate the annular passage 45 of the tubes opening into the inside of the cover 76, with the upstream chamber 72 of the jack.
- the piston extends, on the side of the downstream chamber, towards the outside of the cylinder by the rod 80 secured to the piston to which is connected the link mechanism 29 of the assembly 25.
- the rods 29 of the assembly 25 are hinged the pivots or axes 19 of the blades 21 to change their orientation about the axes B ( Figure 1) depending on the position of the rod 80.
- the piston 71 and its rod 80 are thus rotatably connected to the ring housing 15 of the downstream propeller 3 by the rod mechanism 29.
- the linear cylinder 28 is thus rotatable.
- Two bearings are provided between the cylinder 28 and respectively the sliding tubes 36, 37 of the FFS system 27 to allow rotation of the piston relative to the tubes and thus the change of reference between the static reference of the housing 24 and the rotating mark of the propeller.
- One 81 is disposed between the outer tube 36 and the cover 74 integral with the piston 71.
- the other 82 is disposed in the cavity 78, between the inner tube 37 and the piston 71.
- the desired orientation of the blades of the downstream propeller 3 is obtained in the following manner.
- the chambers 38, 39, 48 of the FFS system 27 are supplied with oil by the three respective lines 23 ', and the pressures sent into them and controlled upstream of the assembly 25, determine the different operating phases of said assembly and as a result, the desired setting of the blades of the downstream propeller 3.
- the passage in the reverse position of the blades is obtained by continuing the movement of the tubes to the right through the progressive communication of the two chambers 38, 39 of the FFS system by the oblong opening 44 larger than the partition 40.
- the surplus pressurized oil which reaches the chamber 72 causes the sliding stroke of the piston 71 to continue to the right of the cylinder and the total output of the rod 80, corresponding to the reverse position of the blades.
- the control assembly 25 with its new architecture achieves the objectives set. Due to the arrangement of the FFS system 27 directly in connection with the fixed housing 24 and the servitudes 23 passing through it, the large lines hydraulic feeders 23 'are immediately connected to the body of the FFS system 27, and no longer pass through the inside of the sheath (FIG. 2). The diameter of the latter can be reduced significantly, since only the diameter of the outer tube is to be passed, which is much smaller than the sum of the three diameters of the large hydraulic lines initially arranged side by side.
- the thus reduced sheath 26 clears space around it, in particular to allow the arrangement, along the sheath, of electrical harnesses for equipment and other bearing lubrication lines, which lines (hydraulic and electrical) are then accessible and visible and can be connected, no longer blind, but easily and safely from the outside.
- this space saving by limiting the radial dimension of the sheath makes it possible to define an epicyclic reduction gear 10 having a larger reduction ratio, since the planet shaft 10 'of this gearbox may have a smaller diameter, which increases the reduction ratio of the gearbox.
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Details Of Gearings (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1601114.0A GB2530467B (en) | 2013-08-12 | 2014-08-05 | Assembly for controlling the pitch variation of a propeller, and turbine engine provided with such assembly |
US14/911,431 US10408127B2 (en) | 2013-08-12 | 2014-08-05 | Turbomachine provided with an assembly for controlling the pitch variation of a propeller |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1357959 | 2013-08-12 | ||
FR1357959A FR3009578B1 (fr) | 2013-08-12 | 2013-08-12 | Ensemble pour commander la variation du pas d'une helice de turbomachine, et turbomachine equipee d'un tel ensemble |
Publications (1)
Publication Number | Publication Date |
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WO2015022464A1 true WO2015022464A1 (fr) | 2015-02-19 |
Family
ID=49578441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2014/052039 WO2015022464A1 (fr) | 2013-08-12 | 2014-08-05 | Turbomachine équipée d'un ensemble pour commander la variation du pas d'une hélice |
Country Status (4)
Country | Link |
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US (1) | US10408127B2 (fr) |
FR (1) | FR3009578B1 (fr) |
GB (1) | GB2530467B (fr) |
WO (1) | WO2015022464A1 (fr) |
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US10753278B2 (en) * | 2016-03-30 | 2020-08-25 | General Electric Company | Translating inlet for adjusting airflow distortion in gas turbine engine |
US10723470B2 (en) * | 2017-06-12 | 2020-07-28 | Raytheon Technologies Corporation | Aft fan counter-rotating turbine engine |
FR3072714B1 (fr) * | 2017-10-24 | 2019-09-27 | Safran Transmission Systems | Tube de transfert d'huile pour un systeme de commande de regulation du pas d'une helice de turbomachine |
CN110422318B (zh) * | 2019-07-10 | 2022-07-19 | 沈阳航空航天大学 | 一种自适应变轴向间距的共轴对转螺旋桨 |
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GB2254893A (en) * | 1991-04-18 | 1992-10-21 | Dowty Aerospace Gloucester | A variable pitch propeller assembley. |
WO1998022340A1 (fr) * | 1996-11-22 | 1998-05-28 | United Technologies Corporation | Systeme equilibre de commande d'helice |
EP2384967A2 (fr) * | 2010-05-06 | 2011-11-09 | Rolls-Royce plc | Biseau de secours |
WO2012131271A1 (fr) * | 2011-03-29 | 2012-10-04 | Snecma | Systeme pour changer le pas d'helices contrarotatives d'un turbomoteur |
-
2013
- 2013-08-12 FR FR1357959A patent/FR3009578B1/fr active Active
-
2014
- 2014-08-05 GB GB1601114.0A patent/GB2530467B/en active Active
- 2014-08-05 WO PCT/FR2014/052039 patent/WO2015022464A1/fr active Application Filing
- 2014-08-05 US US14/911,431 patent/US10408127B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2254893A (en) * | 1991-04-18 | 1992-10-21 | Dowty Aerospace Gloucester | A variable pitch propeller assembley. |
WO1998022340A1 (fr) * | 1996-11-22 | 1998-05-28 | United Technologies Corporation | Systeme equilibre de commande d'helice |
EP2384967A2 (fr) * | 2010-05-06 | 2011-11-09 | Rolls-Royce plc | Biseau de secours |
WO2012131271A1 (fr) * | 2011-03-29 | 2012-10-04 | Snecma | Systeme pour changer le pas d'helices contrarotatives d'un turbomoteur |
Also Published As
Publication number | Publication date |
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GB201601114D0 (en) | 2016-03-09 |
GB2530467A (en) | 2016-03-23 |
FR3009578A1 (fr) | 2015-02-13 |
GB2530467B (en) | 2020-10-14 |
FR3009578B1 (fr) | 2018-06-15 |
US10408127B2 (en) | 2019-09-10 |
US20160195012A1 (en) | 2016-07-07 |
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