WO2015022474A1 - Rotor pour helice de turbomachine avec dispositif de mise en drapeau des pales de l'helice - Google Patents
Rotor pour helice de turbomachine avec dispositif de mise en drapeau des pales de l'helice Download PDFInfo
- Publication number
- WO2015022474A1 WO2015022474A1 PCT/FR2014/052095 FR2014052095W WO2015022474A1 WO 2015022474 A1 WO2015022474 A1 WO 2015022474A1 FR 2014052095 W FR2014052095 W FR 2014052095W WO 2015022474 A1 WO2015022474 A1 WO 2015022474A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- rotor
- rotor according
- blades
- crank
- Prior art date
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
- B64C11/32—Blade pitch-changing mechanisms mechanical
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D7/00—Rotors with blades adjustable in operation; Control thereof
- F01D7/02—Rotors with blades adjustable in operation; Control thereof having adjustment responsive to speed
-
- 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
- B64C11/32—Blade pitch-changing mechanisms mechanical
- B64C11/325—Blade pitch-changing mechanisms mechanical comprising feathering, braking or stopping systems
-
- 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
- B64C11/32—Blade pitch-changing mechanisms mechanical
- B64C11/34—Blade pitch-changing mechanisms mechanical automatic
-
- 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
- B64C11/32—Blade pitch-changing mechanisms mechanical
- B64C11/34—Blade pitch-changing mechanisms mechanical automatic
- B64C11/346—Blade pitch-changing mechanisms mechanical automatic actuated by the centrifugal force or the aerodynamic drag acting on auxiliary masses or surfaces
-
- 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 the field of aeronautical turbomachines and more particularly that of turbine engines with open propeller, so-called “open-rotor” or propeller rapids, and that of devices for controlling the orientation of the blades of these propellers.
- Aircraft engine technology is evolving rapidly and one of the avenues explored to improve the specific fuel consumption of civil aircraft engines is currently the development of open-rotor engines.
- Such engines such as that described in the patent application FR 2 941 493 of the applicant company, comprise a conventional turbine engine gas generator, one or more turbine stages drive an unsheathed fan extending outside the engine.
- the engine generally comprises two counter-rotating propellers, that is to say, which rotate in opposite directions, and which can be located at the front or rear of the engine according to the chosen configuration; for example, to keep them as far away as possible from the passenger cabin.
- the propeller blades of the open-rotor rotors are variable pitch, that is to say that the pitch of these propellers can be modified during the flight to change engine thrust and optimize the efficiency of the propeller as a function of the speed of the aircraft.
- Multiple devices have been devised to vary the pitch of the blades, which generally comprise a rotation of the blade around its main axis by means of bevel gears, located under the base of the blade. These cooperate with bevel gears of a control system.
- the pitch of a propeller moves between two extreme terminals corresponding to a small step position at low forward speed, of the order of 30 ° relative to the plane of rotation of the propellers. , and a large step position at high speed, which is of the order of 65 ° with respect to this same plane of rotation of the propellers.
- the flag position corresponds to a setting greater than that of the large pitch, and equal to about 90 °. Stalling under these normal conditions of use is, by convention, said to be positive.
- the flag position must correspond to an equilibrium position automatically taken by the propeller blades when the timing control system no longer transmits torque.
- the return flag is provided by so-called direct counterweights whose inertia, much greater than that of the blades must ensure the return of the latter in the flag position defined beforehand.
- weights counterweight are attached to the bevel gears of the blade pitch control system and placed cantilever with respect thereto.
- the system is integrated in the spaces between the blades for minimum axial and / or radial space requirement. In normal operation they are held in position by the control system. In case of failure of this system, the action of the centrifugal force due to the rotation of the propeller drives them to a rest position which corresponds to the flag position of the blade.
- the tapered blade foot gear gives rise to a reduction ratio of about 2 between the counterweight setting angle and the blade pitch angle.
- Other embodiments relating to feathering devices of the blades of a propeller, with weights driving a pinion integral with the blade root, are described in documents GB 2 218 747, FR 2 864 942 GB 124 935 or US 2,353,334.
- the present invention aims to overcome these disadvantages.
- the invention thus has the primary objective of reducing the mass used in the feathering device of the blades of a turbine engine propeller.
- the invention also aims at a rotor comprising a feathering device the latter providing a margin of definition of its characteristics without being limited by the space available on the rotor.
- Still another object of the invention is a rotor with a feathering device on which the vibrations and oscillations of the machine have a reduced impact.
- a rotor for turbine engine propeller with variable pitch blades, comprising blade roots movable in rotation in a structure supporting the blades, a toothed wheel being secured to the blade root, and a setting device.
- blade of the blades being adapted to rotate the blade root by means of the gear wheel, characterized in that said feathering device comprises at least one flyweight integral with a crank connected by a gear train at least one of said blade roots.
- the weight is disposed outside the plane of rotation of the rotor; in this way the device is not constrained by the space available for its travel.
- the crank is rotated by the flyweight about an axis parallel to the axis of rotation of the rotor. It is furthermore possible to reduce the impact of vibrations with a gear train comprising means of catching play.
- the play-catching means comprises a wheel with teeth comprising flexible elements ensuring continuous inter-tooth contact.
- the game-catching means comprises a double game-catching gear.
- the double game-catching gear comprises two pinions connected by a rod.
- the rotor comprising a toothed wheel connected to a blade root
- the double game-catching gear is in the same plane as the toothed wheel connected to the blade root, said plane being perpendicular to the blade root .
- the double gear with catch-up clearance is secured to a first pinion gear contact cooperating with a second pinion contact connected to the crank handle.
- the second angular contact gear connected to the crank is integral with a coaxial gear cooperating with the crank.
- the feathering device may be associated with one or more blade roots; preferably the feathering device is associated with each of the blade roots.
- the invention also relates to a propeller comprising the rotor having the above characteristics and the blades disposed in the blade roots.
- FIG. 1 is a schematic sectional view of a fast-acting turbine engine
- FIG. 2 is a partial view, in perspective, of the rotor ring with the feathering device according to the invention
- FIG. 3 is a side view of the device shown in Figure 2;
- FIG. 4 is a view from above of the device represented in FIG. 2;
- a propeller turbine 1 comprising, on the one hand, a gas turbine engine forming a gas generator comprising, among other components, a compressor 2, a combustion chamber 3 and a turbine 4 which drives the compressor 2, and, on the other hand, a free turbine 5 situated downstream of the linked turbine 4, which drives two series of blades of the counter-rotating propellers 6.
- the propellers are positioned outside the casing 7 of the gas generator and their blades are held by a blade root 8 mobile in rotation about a radial axis relative to that of the turbomachine 1. This axis passes through the center of the root of the blade and constitutes the main axis of the blade.
- the rotation of the blade around its axis is ensured by an actuator, having for example the shape of a rod 9, which acts on a pair of pinions conical one of which is fixed on the blade, surrounding the foot of the blade 8.
- a control system 10 controls, through the rods 9, the angular position of the blades of each of the propellers 6 and s' ensures their synchronized rotation.
- the invention is not limited to an application on this type of engine. This is described as an illustrative example.
- Figures 2, 3 and 4 show in three different directions, a partial view of a rotor for a propeller of an engine as described above.
- a ring 20 with an axis corresponding to that of the motor, having openings 21 radial with respect to its axis.
- An embodiment of this ring is described in patent FR 2953487 in the name of the applicant. It is of polygonal shape with structural ring elements, upstream 20a and downstream 20b, connected by platforms 20c.
- the openings 21 serve as housing for blade feet that have not been shown with the exception of the part 22 which is the mounting cell of a blade.
- This piece has according to this example an axial groove in which is received the inner radial end of the blade.
- the part of the blade root housed in the opening 21 has not been shown either for clarity.
- This foot is mounted so as to be rotatable about the axis of the opening 21. Suitable bearings are provided for this purpose. They are not represented either.
- the feathering device 30 comprises a toothed wheel 31 integral with the blade root; here it is integral with the piece 22.
- the wheel is toothed on a sector of angle only corresponding to the authorized clearance of the rotating blade root.
- the toothed wheel 31 is perpendicular to the blade root and its axis of rotation.
- a double gear with catch-up gear 33 meshes with the toothed wheel 31.
- the double gear 33 is formed of two toothed pinions 33a and 33b placed against each other and connected in rotation by an elastic means.
- the teeth of the gears are slightly angularly offset from one another.
- the teeth of the double gear 33 are in this way in permanent contact at least by the teeth of one of the pinions with the teeth of the toothed wheel 31.
- FIGS. 5 and 6 show two non-limiting embodiments of such a double gear with play clearance.
- the two toothed gears 33a and 33b represented diagrammatically by discs, are connected by springs 33c working in compression.
- the two toothed gears are connected by parts 33c 'in the form of pads working in flexion.
- the springs 33c can be replaced by flexible and deformable elements from absorbing vibrations.
- the two gears are in the same plane of rotation as that of the toothed wheel 31 or in a plane parallel thereto. They are supported by a shaft 34 parallel to the axis of rotation of the blade root.
- One of the pinions 33a or 33b of the double gear is secured to the shaft 34, the other is rotatable relative thereto within the limit defined by the springs 33c or equivalent.
- a toothed wheel 37 On the same axis is mounted a toothed wheel 37 on which meshing the axis of a crank 39.
- the weight 40 is integral with the crank 39 being eccentric with respect to the axis of rotation of the crank.
- the centrifugal force tilts the weight 40 from a first position where the device is inactive to a second position and the crank 39 is driven into position. rotation around its axis. It follows a rotational movement of the toothed wheel 37 and by way of As a result of the bevel gears 35 and 36, the double gear 33 and the gear 31, about their respective axes. The movement of the weight is thus transmitted to the associated blade root by the gear train formed by all the pinions and toothed wheels, with a transmission ratio of the effort, appropriate.
- the solution of the invention allows better resistance to the centrifugal force by reducing the masses resulting from the kinematic chain and the gearing.
- the integration of gear counterweights is ensured by the installation of these outside the plane of rotation of the propeller which causes a small impact of the proximity of the blades or the nacelle.
- the impact of vibrations is reduced by the presence of a clearance stage in the gear train.
- This solution allows symmetrical clamping on both sides of the center of gravity in order to counter the offset of the installation of the device.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/911,172 US10036262B2 (en) | 2013-08-14 | 2014-08-14 | Turbomachine impellor rotor with device for feathering the blades of the impellor |
GB1601912.7A GB2530963B (en) | 2013-08-14 | 2014-08-14 | Turbomachine impellor rotor with device for feathering the blades of the impellor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1358030 | 2013-08-14 | ||
FR1358030A FR3009710B1 (fr) | 2013-08-14 | 2013-08-14 | Rotor pour helice de turbomachine avec dispositif de mise en drapeau des pales de l'helice |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015022474A1 true WO2015022474A1 (fr) | 2015-02-19 |
Family
ID=49667337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2014/052095 WO2015022474A1 (fr) | 2013-08-14 | 2014-08-14 | Rotor pour helice de turbomachine avec dispositif de mise en drapeau des pales de l'helice |
Country Status (4)
Country | Link |
---|---|
US (1) | US10036262B2 (fr) |
FR (1) | FR3009710B1 (fr) |
GB (1) | GB2530963B (fr) |
WO (1) | WO2015022474A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3046433B1 (fr) | 2016-01-05 | 2019-05-24 | Safran Aircraft Engines | Module de soufflante a aubes a calage variable pour une turbomachine |
FR3046432B1 (fr) | 2016-01-05 | 2018-01-26 | Safran Aircraft Engines | Module de soufflante a aubes a calage variable pour une turbomachine |
US11505306B2 (en) | 2021-04-05 | 2022-11-22 | General Electric Company | Variable pitch fan assembly with remote counterweights |
FR3124825B1 (fr) * | 2021-06-30 | 2023-05-26 | Safran Aircraft Engines | Helice pour une turbomachine d’aeronef avec une aube a calage variable et un dispositif de contrepoids a engrenage |
FR3139795B1 (fr) * | 2022-09-15 | 2024-08-23 | Safran Aircraft Engines | Module de soufflante a pales a calage variable |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB124935A (en) | 1918-04-30 | 1919-04-10 | Stephane Drzewiecki | Improvements in Self Setting Sails or Blades of Windmills or of Tractor Screws or of Pusher Screws of Aeroplanes or Dirigibles. |
US2353334A (en) | 1942-04-27 | 1944-07-11 | Virgil V Haugh | Constant load transmission |
GB2218747A (en) | 1988-05-20 | 1989-11-22 | Gen Electric | Propeller/fan pitch feathering apparatus |
FR2864942A1 (fr) | 2004-01-09 | 2005-07-15 | De Ponfilly Adrien Pean | Dispositif pour ranger des produits usuels de petites et moyennes tailles et pour les visualiser |
FR2941493A1 (fr) | 2009-01-23 | 2010-07-30 | Snecma | Turbomachine a turbine libre entrainant un generateur electrique de puissance |
FR2953487A1 (fr) | 2009-12-07 | 2011-06-10 | Snecma | Moyeu d'helice a anneau polygonal renforce et turbomachine equipee d'un tel moyeu. |
FR2964942A1 (fr) * | 2010-09-22 | 2012-03-23 | Snecma | Enceinte de protection des pignons de commande du pas d'une helice d'open-rotor |
WO2012066240A1 (fr) | 2010-11-16 | 2012-05-24 | Snecma | Dispositif de passage d'une hélice en réverse comportant un actuateur agissant sur un maneton |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US235334A (en) | 1880-12-14 | Corn-planter | ||
US3912418A (en) * | 1974-10-01 | 1975-10-14 | United Technologies Corp | Lubrication system for a rotor |
GB2182727B (en) * | 1985-11-12 | 1989-09-27 | Gen Electric | Propeller/fan pitch feathering apparatus |
US5154372A (en) * | 1990-07-23 | 1992-10-13 | General Electric Company | Torque multiplier for aircraft propeller |
US5152668A (en) * | 1990-07-23 | 1992-10-06 | General Electric Company | Pitch change mechanism for prop fans |
FR2956854B1 (fr) * | 2010-03-01 | 2012-08-17 | Snecma | Dispositif de commande de l'orientation des pales de soufflante d'un turbopropulseur par contrepoids. |
US8955409B2 (en) * | 2012-10-12 | 2015-02-17 | Hamilton Sundstrand Corporation | Rotating assembly including a dynamic balancing system |
-
2013
- 2013-08-14 FR FR1358030A patent/FR3009710B1/fr active Active
-
2014
- 2014-08-14 WO PCT/FR2014/052095 patent/WO2015022474A1/fr active Application Filing
- 2014-08-14 GB GB1601912.7A patent/GB2530963B/en active Active
- 2014-08-14 US US14/911,172 patent/US10036262B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB124935A (en) | 1918-04-30 | 1919-04-10 | Stephane Drzewiecki | Improvements in Self Setting Sails or Blades of Windmills or of Tractor Screws or of Pusher Screws of Aeroplanes or Dirigibles. |
US2353334A (en) | 1942-04-27 | 1944-07-11 | Virgil V Haugh | Constant load transmission |
GB2218747A (en) | 1988-05-20 | 1989-11-22 | Gen Electric | Propeller/fan pitch feathering apparatus |
FR2864942A1 (fr) | 2004-01-09 | 2005-07-15 | De Ponfilly Adrien Pean | Dispositif pour ranger des produits usuels de petites et moyennes tailles et pour les visualiser |
FR2941493A1 (fr) | 2009-01-23 | 2010-07-30 | Snecma | Turbomachine a turbine libre entrainant un generateur electrique de puissance |
FR2953487A1 (fr) | 2009-12-07 | 2011-06-10 | Snecma | Moyeu d'helice a anneau polygonal renforce et turbomachine equipee d'un tel moyeu. |
FR2964942A1 (fr) * | 2010-09-22 | 2012-03-23 | Snecma | Enceinte de protection des pignons de commande du pas d'une helice d'open-rotor |
WO2012066240A1 (fr) | 2010-11-16 | 2012-05-24 | Snecma | Dispositif de passage d'une hélice en réverse comportant un actuateur agissant sur un maneton |
Also Published As
Publication number | Publication date |
---|---|
FR3009710B1 (fr) | 2017-04-14 |
GB2530963B (en) | 2020-04-22 |
GB201601912D0 (en) | 2016-03-16 |
US20160186584A1 (en) | 2016-06-30 |
US10036262B2 (en) | 2018-07-31 |
FR3009710A1 (fr) | 2015-02-20 |
GB2530963A (en) | 2016-04-06 |
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